mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 05:16:38 +07:00
f21ec3d2d4
In most of the time, the driver needs to check if the cts flow control is enabled. But now, the driver checks the ASYNC_CTS_FLOW flag manually, which is not a grace way. So add a new wraper function to make the code tidy and clean. Signed-off-by: Huang Shijie <shijie8@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8123 lines
230 KiB
C
8123 lines
230 KiB
C
/*
|
|
* $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
|
|
*
|
|
* Device driver for Microgate SyncLink ISA and PCI
|
|
* high speed multiprotocol serial adapters.
|
|
*
|
|
* written by Paul Fulghum for Microgate Corporation
|
|
* paulkf@microgate.com
|
|
*
|
|
* Microgate and SyncLink are trademarks of Microgate Corporation
|
|
*
|
|
* Derived from serial.c written by Theodore Ts'o and Linus Torvalds
|
|
*
|
|
* Original release 01/11/99
|
|
*
|
|
* This code is released under the GNU General Public License (GPL)
|
|
*
|
|
* This driver is primarily intended for use in synchronous
|
|
* HDLC mode. Asynchronous mode is also provided.
|
|
*
|
|
* When operating in synchronous mode, each call to mgsl_write()
|
|
* contains exactly one complete HDLC frame. Calling mgsl_put_char
|
|
* will start assembling an HDLC frame that will not be sent until
|
|
* mgsl_flush_chars or mgsl_write is called.
|
|
*
|
|
* Synchronous receive data is reported as complete frames. To accomplish
|
|
* this, the TTY flip buffer is bypassed (too small to hold largest
|
|
* frame and may fragment frames) and the line discipline
|
|
* receive entry point is called directly.
|
|
*
|
|
* This driver has been tested with a slightly modified ppp.c driver
|
|
* for synchronous PPP.
|
|
*
|
|
* 2000/02/16
|
|
* Added interface for syncppp.c driver (an alternate synchronous PPP
|
|
* implementation that also supports Cisco HDLC). Each device instance
|
|
* registers as a tty device AND a network device (if dosyncppp option
|
|
* is set for the device). The functionality is determined by which
|
|
* device interface is opened.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(__i386__)
|
|
# define BREAKPOINT() asm(" int $3");
|
|
#else
|
|
# define BREAKPOINT() { }
|
|
#endif
|
|
|
|
#define MAX_ISA_DEVICES 10
|
|
#define MAX_PCI_DEVICES 10
|
|
#define MAX_TOTAL_DEVICES 20
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/major.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/synclink.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/dma.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/types.h>
|
|
#include <linux/termios.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/hdlc.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
|
|
#define SYNCLINK_GENERIC_HDLC 1
|
|
#else
|
|
#define SYNCLINK_GENERIC_HDLC 0
|
|
#endif
|
|
|
|
#define GET_USER(error,value,addr) error = get_user(value,addr)
|
|
#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
|
|
#define PUT_USER(error,value,addr) error = put_user(value,addr)
|
|
#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#define RCLRVALUE 0xffff
|
|
|
|
static MGSL_PARAMS default_params = {
|
|
MGSL_MODE_HDLC, /* unsigned long mode */
|
|
0, /* unsigned char loopback; */
|
|
HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
|
|
HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
|
|
0, /* unsigned long clock_speed; */
|
|
0xff, /* unsigned char addr_filter; */
|
|
HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
|
|
HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
|
|
HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
|
|
9600, /* unsigned long data_rate; */
|
|
8, /* unsigned char data_bits; */
|
|
1, /* unsigned char stop_bits; */
|
|
ASYNC_PARITY_NONE /* unsigned char parity; */
|
|
};
|
|
|
|
#define SHARED_MEM_ADDRESS_SIZE 0x40000
|
|
#define BUFFERLISTSIZE 4096
|
|
#define DMABUFFERSIZE 4096
|
|
#define MAXRXFRAMES 7
|
|
|
|
typedef struct _DMABUFFERENTRY
|
|
{
|
|
u32 phys_addr; /* 32-bit flat physical address of data buffer */
|
|
volatile u16 count; /* buffer size/data count */
|
|
volatile u16 status; /* Control/status field */
|
|
volatile u16 rcc; /* character count field */
|
|
u16 reserved; /* padding required by 16C32 */
|
|
u32 link; /* 32-bit flat link to next buffer entry */
|
|
char *virt_addr; /* virtual address of data buffer */
|
|
u32 phys_entry; /* physical address of this buffer entry */
|
|
dma_addr_t dma_addr;
|
|
} DMABUFFERENTRY, *DMAPBUFFERENTRY;
|
|
|
|
/* The queue of BH actions to be performed */
|
|
|
|
#define BH_RECEIVE 1
|
|
#define BH_TRANSMIT 2
|
|
#define BH_STATUS 4
|
|
|
|
#define IO_PIN_SHUTDOWN_LIMIT 100
|
|
|
|
struct _input_signal_events {
|
|
int ri_up;
|
|
int ri_down;
|
|
int dsr_up;
|
|
int dsr_down;
|
|
int dcd_up;
|
|
int dcd_down;
|
|
int cts_up;
|
|
int cts_down;
|
|
};
|
|
|
|
/* transmit holding buffer definitions*/
|
|
#define MAX_TX_HOLDING_BUFFERS 5
|
|
struct tx_holding_buffer {
|
|
int buffer_size;
|
|
unsigned char * buffer;
|
|
};
|
|
|
|
|
|
/*
|
|
* Device instance data structure
|
|
*/
|
|
|
|
struct mgsl_struct {
|
|
int magic;
|
|
struct tty_port port;
|
|
int line;
|
|
int hw_version;
|
|
|
|
struct mgsl_icount icount;
|
|
|
|
int timeout;
|
|
int x_char; /* xon/xoff character */
|
|
u16 read_status_mask;
|
|
u16 ignore_status_mask;
|
|
unsigned char *xmit_buf;
|
|
int xmit_head;
|
|
int xmit_tail;
|
|
int xmit_cnt;
|
|
|
|
wait_queue_head_t status_event_wait_q;
|
|
wait_queue_head_t event_wait_q;
|
|
struct timer_list tx_timer; /* HDLC transmit timeout timer */
|
|
struct mgsl_struct *next_device; /* device list link */
|
|
|
|
spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
|
|
struct work_struct task; /* task structure for scheduling bh */
|
|
|
|
u32 EventMask; /* event trigger mask */
|
|
u32 RecordedEvents; /* pending events */
|
|
|
|
u32 max_frame_size; /* as set by device config */
|
|
|
|
u32 pending_bh;
|
|
|
|
bool bh_running; /* Protection from multiple */
|
|
int isr_overflow;
|
|
bool bh_requested;
|
|
|
|
int dcd_chkcount; /* check counts to prevent */
|
|
int cts_chkcount; /* too many IRQs if a signal */
|
|
int dsr_chkcount; /* is floating */
|
|
int ri_chkcount;
|
|
|
|
char *buffer_list; /* virtual address of Rx & Tx buffer lists */
|
|
u32 buffer_list_phys;
|
|
dma_addr_t buffer_list_dma_addr;
|
|
|
|
unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
|
|
DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
|
|
unsigned int current_rx_buffer;
|
|
|
|
int num_tx_dma_buffers; /* number of tx dma frames required */
|
|
int tx_dma_buffers_used;
|
|
unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
|
|
DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
|
|
int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
|
|
int current_tx_buffer; /* next tx dma buffer to be loaded */
|
|
|
|
unsigned char *intermediate_rxbuffer;
|
|
|
|
int num_tx_holding_buffers; /* number of tx holding buffer allocated */
|
|
int get_tx_holding_index; /* next tx holding buffer for adapter to load */
|
|
int put_tx_holding_index; /* next tx holding buffer to store user request */
|
|
int tx_holding_count; /* number of tx holding buffers waiting */
|
|
struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
|
|
|
|
bool rx_enabled;
|
|
bool rx_overflow;
|
|
bool rx_rcc_underrun;
|
|
|
|
bool tx_enabled;
|
|
bool tx_active;
|
|
u32 idle_mode;
|
|
|
|
u16 cmr_value;
|
|
u16 tcsr_value;
|
|
|
|
char device_name[25]; /* device instance name */
|
|
|
|
unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
|
|
unsigned char bus; /* expansion bus number (zero based) */
|
|
unsigned char function; /* PCI device number */
|
|
|
|
unsigned int io_base; /* base I/O address of adapter */
|
|
unsigned int io_addr_size; /* size of the I/O address range */
|
|
bool io_addr_requested; /* true if I/O address requested */
|
|
|
|
unsigned int irq_level; /* interrupt level */
|
|
unsigned long irq_flags;
|
|
bool irq_requested; /* true if IRQ requested */
|
|
|
|
unsigned int dma_level; /* DMA channel */
|
|
bool dma_requested; /* true if dma channel requested */
|
|
|
|
u16 mbre_bit;
|
|
u16 loopback_bits;
|
|
u16 usc_idle_mode;
|
|
|
|
MGSL_PARAMS params; /* communications parameters */
|
|
|
|
unsigned char serial_signals; /* current serial signal states */
|
|
|
|
bool irq_occurred; /* for diagnostics use */
|
|
unsigned int init_error; /* Initialization startup error (DIAGS) */
|
|
int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
|
|
|
|
u32 last_mem_alloc;
|
|
unsigned char* memory_base; /* shared memory address (PCI only) */
|
|
u32 phys_memory_base;
|
|
bool shared_mem_requested;
|
|
|
|
unsigned char* lcr_base; /* local config registers (PCI only) */
|
|
u32 phys_lcr_base;
|
|
u32 lcr_offset;
|
|
bool lcr_mem_requested;
|
|
|
|
u32 misc_ctrl_value;
|
|
char flag_buf[MAX_ASYNC_BUFFER_SIZE];
|
|
char char_buf[MAX_ASYNC_BUFFER_SIZE];
|
|
bool drop_rts_on_tx_done;
|
|
|
|
bool loopmode_insert_requested;
|
|
bool loopmode_send_done_requested;
|
|
|
|
struct _input_signal_events input_signal_events;
|
|
|
|
/* generic HDLC device parts */
|
|
int netcount;
|
|
spinlock_t netlock;
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
struct net_device *netdev;
|
|
#endif
|
|
};
|
|
|
|
#define MGSL_MAGIC 0x5401
|
|
|
|
/*
|
|
* The size of the serial xmit buffer is 1 page, or 4096 bytes
|
|
*/
|
|
#ifndef SERIAL_XMIT_SIZE
|
|
#define SERIAL_XMIT_SIZE 4096
|
|
#endif
|
|
|
|
/*
|
|
* These macros define the offsets used in calculating the
|
|
* I/O address of the specified USC registers.
|
|
*/
|
|
|
|
|
|
#define DCPIN 2 /* Bit 1 of I/O address */
|
|
#define SDPIN 4 /* Bit 2 of I/O address */
|
|
|
|
#define DCAR 0 /* DMA command/address register */
|
|
#define CCAR SDPIN /* channel command/address register */
|
|
#define DATAREG DCPIN + SDPIN /* serial data register */
|
|
#define MSBONLY 0x41
|
|
#define LSBONLY 0x40
|
|
|
|
/*
|
|
* These macros define the register address (ordinal number)
|
|
* used for writing address/value pairs to the USC.
|
|
*/
|
|
|
|
#define CMR 0x02 /* Channel mode Register */
|
|
#define CCSR 0x04 /* Channel Command/status Register */
|
|
#define CCR 0x06 /* Channel Control Register */
|
|
#define PSR 0x08 /* Port status Register */
|
|
#define PCR 0x0a /* Port Control Register */
|
|
#define TMDR 0x0c /* Test mode Data Register */
|
|
#define TMCR 0x0e /* Test mode Control Register */
|
|
#define CMCR 0x10 /* Clock mode Control Register */
|
|
#define HCR 0x12 /* Hardware Configuration Register */
|
|
#define IVR 0x14 /* Interrupt Vector Register */
|
|
#define IOCR 0x16 /* Input/Output Control Register */
|
|
#define ICR 0x18 /* Interrupt Control Register */
|
|
#define DCCR 0x1a /* Daisy Chain Control Register */
|
|
#define MISR 0x1c /* Misc Interrupt status Register */
|
|
#define SICR 0x1e /* status Interrupt Control Register */
|
|
#define RDR 0x20 /* Receive Data Register */
|
|
#define RMR 0x22 /* Receive mode Register */
|
|
#define RCSR 0x24 /* Receive Command/status Register */
|
|
#define RICR 0x26 /* Receive Interrupt Control Register */
|
|
#define RSR 0x28 /* Receive Sync Register */
|
|
#define RCLR 0x2a /* Receive count Limit Register */
|
|
#define RCCR 0x2c /* Receive Character count Register */
|
|
#define TC0R 0x2e /* Time Constant 0 Register */
|
|
#define TDR 0x30 /* Transmit Data Register */
|
|
#define TMR 0x32 /* Transmit mode Register */
|
|
#define TCSR 0x34 /* Transmit Command/status Register */
|
|
#define TICR 0x36 /* Transmit Interrupt Control Register */
|
|
#define TSR 0x38 /* Transmit Sync Register */
|
|
#define TCLR 0x3a /* Transmit count Limit Register */
|
|
#define TCCR 0x3c /* Transmit Character count Register */
|
|
#define TC1R 0x3e /* Time Constant 1 Register */
|
|
|
|
|
|
/*
|
|
* MACRO DEFINITIONS FOR DMA REGISTERS
|
|
*/
|
|
|
|
#define DCR 0x06 /* DMA Control Register (shared) */
|
|
#define DACR 0x08 /* DMA Array count Register (shared) */
|
|
#define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
|
|
#define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
|
|
#define DICR 0x18 /* DMA Interrupt Control Register (shared) */
|
|
#define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
|
|
#define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
|
|
|
|
#define TDMR 0x02 /* Transmit DMA mode Register */
|
|
#define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
|
|
#define TBCR 0x2a /* Transmit Byte count Register */
|
|
#define TARL 0x2c /* Transmit Address Register (low) */
|
|
#define TARU 0x2e /* Transmit Address Register (high) */
|
|
#define NTBCR 0x3a /* Next Transmit Byte count Register */
|
|
#define NTARL 0x3c /* Next Transmit Address Register (low) */
|
|
#define NTARU 0x3e /* Next Transmit Address Register (high) */
|
|
|
|
#define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
|
|
#define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
|
|
#define RBCR 0xaa /* Receive Byte count Register */
|
|
#define RARL 0xac /* Receive Address Register (low) */
|
|
#define RARU 0xae /* Receive Address Register (high) */
|
|
#define NRBCR 0xba /* Next Receive Byte count Register */
|
|
#define NRARL 0xbc /* Next Receive Address Register (low) */
|
|
#define NRARU 0xbe /* Next Receive Address Register (high) */
|
|
|
|
|
|
/*
|
|
* MACRO DEFINITIONS FOR MODEM STATUS BITS
|
|
*/
|
|
|
|
#define MODEMSTATUS_DTR 0x80
|
|
#define MODEMSTATUS_DSR 0x40
|
|
#define MODEMSTATUS_RTS 0x20
|
|
#define MODEMSTATUS_CTS 0x10
|
|
#define MODEMSTATUS_RI 0x04
|
|
#define MODEMSTATUS_DCD 0x01
|
|
|
|
|
|
/*
|
|
* Channel Command/Address Register (CCAR) Command Codes
|
|
*/
|
|
|
|
#define RTCmd_Null 0x0000
|
|
#define RTCmd_ResetHighestIus 0x1000
|
|
#define RTCmd_TriggerChannelLoadDma 0x2000
|
|
#define RTCmd_TriggerRxDma 0x2800
|
|
#define RTCmd_TriggerTxDma 0x3000
|
|
#define RTCmd_TriggerRxAndTxDma 0x3800
|
|
#define RTCmd_PurgeRxFifo 0x4800
|
|
#define RTCmd_PurgeTxFifo 0x5000
|
|
#define RTCmd_PurgeRxAndTxFifo 0x5800
|
|
#define RTCmd_LoadRcc 0x6800
|
|
#define RTCmd_LoadTcc 0x7000
|
|
#define RTCmd_LoadRccAndTcc 0x7800
|
|
#define RTCmd_LoadTC0 0x8800
|
|
#define RTCmd_LoadTC1 0x9000
|
|
#define RTCmd_LoadTC0AndTC1 0x9800
|
|
#define RTCmd_SerialDataLSBFirst 0xa000
|
|
#define RTCmd_SerialDataMSBFirst 0xa800
|
|
#define RTCmd_SelectBigEndian 0xb000
|
|
#define RTCmd_SelectLittleEndian 0xb800
|
|
|
|
|
|
/*
|
|
* DMA Command/Address Register (DCAR) Command Codes
|
|
*/
|
|
|
|
#define DmaCmd_Null 0x0000
|
|
#define DmaCmd_ResetTxChannel 0x1000
|
|
#define DmaCmd_ResetRxChannel 0x1200
|
|
#define DmaCmd_StartTxChannel 0x2000
|
|
#define DmaCmd_StartRxChannel 0x2200
|
|
#define DmaCmd_ContinueTxChannel 0x3000
|
|
#define DmaCmd_ContinueRxChannel 0x3200
|
|
#define DmaCmd_PauseTxChannel 0x4000
|
|
#define DmaCmd_PauseRxChannel 0x4200
|
|
#define DmaCmd_AbortTxChannel 0x5000
|
|
#define DmaCmd_AbortRxChannel 0x5200
|
|
#define DmaCmd_InitTxChannel 0x7000
|
|
#define DmaCmd_InitRxChannel 0x7200
|
|
#define DmaCmd_ResetHighestDmaIus 0x8000
|
|
#define DmaCmd_ResetAllChannels 0x9000
|
|
#define DmaCmd_StartAllChannels 0xa000
|
|
#define DmaCmd_ContinueAllChannels 0xb000
|
|
#define DmaCmd_PauseAllChannels 0xc000
|
|
#define DmaCmd_AbortAllChannels 0xd000
|
|
#define DmaCmd_InitAllChannels 0xf000
|
|
|
|
#define TCmd_Null 0x0000
|
|
#define TCmd_ClearTxCRC 0x2000
|
|
#define TCmd_SelectTicrTtsaData 0x4000
|
|
#define TCmd_SelectTicrTxFifostatus 0x5000
|
|
#define TCmd_SelectTicrIntLevel 0x6000
|
|
#define TCmd_SelectTicrdma_level 0x7000
|
|
#define TCmd_SendFrame 0x8000
|
|
#define TCmd_SendAbort 0x9000
|
|
#define TCmd_EnableDleInsertion 0xc000
|
|
#define TCmd_DisableDleInsertion 0xd000
|
|
#define TCmd_ClearEofEom 0xe000
|
|
#define TCmd_SetEofEom 0xf000
|
|
|
|
#define RCmd_Null 0x0000
|
|
#define RCmd_ClearRxCRC 0x2000
|
|
#define RCmd_EnterHuntmode 0x3000
|
|
#define RCmd_SelectRicrRtsaData 0x4000
|
|
#define RCmd_SelectRicrRxFifostatus 0x5000
|
|
#define RCmd_SelectRicrIntLevel 0x6000
|
|
#define RCmd_SelectRicrdma_level 0x7000
|
|
|
|
/*
|
|
* Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
|
|
*/
|
|
|
|
#define RECEIVE_STATUS BIT5
|
|
#define RECEIVE_DATA BIT4
|
|
#define TRANSMIT_STATUS BIT3
|
|
#define TRANSMIT_DATA BIT2
|
|
#define IO_PIN BIT1
|
|
#define MISC BIT0
|
|
|
|
|
|
/*
|
|
* Receive status Bits in Receive Command/status Register RCSR
|
|
*/
|
|
|
|
#define RXSTATUS_SHORT_FRAME BIT8
|
|
#define RXSTATUS_CODE_VIOLATION BIT8
|
|
#define RXSTATUS_EXITED_HUNT BIT7
|
|
#define RXSTATUS_IDLE_RECEIVED BIT6
|
|
#define RXSTATUS_BREAK_RECEIVED BIT5
|
|
#define RXSTATUS_ABORT_RECEIVED BIT5
|
|
#define RXSTATUS_RXBOUND BIT4
|
|
#define RXSTATUS_CRC_ERROR BIT3
|
|
#define RXSTATUS_FRAMING_ERROR BIT3
|
|
#define RXSTATUS_ABORT BIT2
|
|
#define RXSTATUS_PARITY_ERROR BIT2
|
|
#define RXSTATUS_OVERRUN BIT1
|
|
#define RXSTATUS_DATA_AVAILABLE BIT0
|
|
#define RXSTATUS_ALL 0x01f6
|
|
#define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
|
|
|
|
/*
|
|
* Values for setting transmit idle mode in
|
|
* Transmit Control/status Register (TCSR)
|
|
*/
|
|
#define IDLEMODE_FLAGS 0x0000
|
|
#define IDLEMODE_ALT_ONE_ZERO 0x0100
|
|
#define IDLEMODE_ZERO 0x0200
|
|
#define IDLEMODE_ONE 0x0300
|
|
#define IDLEMODE_ALT_MARK_SPACE 0x0500
|
|
#define IDLEMODE_SPACE 0x0600
|
|
#define IDLEMODE_MARK 0x0700
|
|
#define IDLEMODE_MASK 0x0700
|
|
|
|
/*
|
|
* IUSC revision identifiers
|
|
*/
|
|
#define IUSC_SL1660 0x4d44
|
|
#define IUSC_PRE_SL1660 0x4553
|
|
|
|
/*
|
|
* Transmit status Bits in Transmit Command/status Register (TCSR)
|
|
*/
|
|
|
|
#define TCSR_PRESERVE 0x0F00
|
|
|
|
#define TCSR_UNDERWAIT BIT11
|
|
#define TXSTATUS_PREAMBLE_SENT BIT7
|
|
#define TXSTATUS_IDLE_SENT BIT6
|
|
#define TXSTATUS_ABORT_SENT BIT5
|
|
#define TXSTATUS_EOF_SENT BIT4
|
|
#define TXSTATUS_EOM_SENT BIT4
|
|
#define TXSTATUS_CRC_SENT BIT3
|
|
#define TXSTATUS_ALL_SENT BIT2
|
|
#define TXSTATUS_UNDERRUN BIT1
|
|
#define TXSTATUS_FIFO_EMPTY BIT0
|
|
#define TXSTATUS_ALL 0x00fa
|
|
#define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
|
|
|
|
|
|
#define MISCSTATUS_RXC_LATCHED BIT15
|
|
#define MISCSTATUS_RXC BIT14
|
|
#define MISCSTATUS_TXC_LATCHED BIT13
|
|
#define MISCSTATUS_TXC BIT12
|
|
#define MISCSTATUS_RI_LATCHED BIT11
|
|
#define MISCSTATUS_RI BIT10
|
|
#define MISCSTATUS_DSR_LATCHED BIT9
|
|
#define MISCSTATUS_DSR BIT8
|
|
#define MISCSTATUS_DCD_LATCHED BIT7
|
|
#define MISCSTATUS_DCD BIT6
|
|
#define MISCSTATUS_CTS_LATCHED BIT5
|
|
#define MISCSTATUS_CTS BIT4
|
|
#define MISCSTATUS_RCC_UNDERRUN BIT3
|
|
#define MISCSTATUS_DPLL_NO_SYNC BIT2
|
|
#define MISCSTATUS_BRG1_ZERO BIT1
|
|
#define MISCSTATUS_BRG0_ZERO BIT0
|
|
|
|
#define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
|
|
#define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
|
|
|
|
#define SICR_RXC_ACTIVE BIT15
|
|
#define SICR_RXC_INACTIVE BIT14
|
|
#define SICR_RXC (BIT15+BIT14)
|
|
#define SICR_TXC_ACTIVE BIT13
|
|
#define SICR_TXC_INACTIVE BIT12
|
|
#define SICR_TXC (BIT13+BIT12)
|
|
#define SICR_RI_ACTIVE BIT11
|
|
#define SICR_RI_INACTIVE BIT10
|
|
#define SICR_RI (BIT11+BIT10)
|
|
#define SICR_DSR_ACTIVE BIT9
|
|
#define SICR_DSR_INACTIVE BIT8
|
|
#define SICR_DSR (BIT9+BIT8)
|
|
#define SICR_DCD_ACTIVE BIT7
|
|
#define SICR_DCD_INACTIVE BIT6
|
|
#define SICR_DCD (BIT7+BIT6)
|
|
#define SICR_CTS_ACTIVE BIT5
|
|
#define SICR_CTS_INACTIVE BIT4
|
|
#define SICR_CTS (BIT5+BIT4)
|
|
#define SICR_RCC_UNDERFLOW BIT3
|
|
#define SICR_DPLL_NO_SYNC BIT2
|
|
#define SICR_BRG1_ZERO BIT1
|
|
#define SICR_BRG0_ZERO BIT0
|
|
|
|
void usc_DisableMasterIrqBit( struct mgsl_struct *info );
|
|
void usc_EnableMasterIrqBit( struct mgsl_struct *info );
|
|
void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
|
|
void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
|
|
void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
|
|
|
|
#define usc_EnableInterrupts( a, b ) \
|
|
usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
|
|
|
|
#define usc_DisableInterrupts( a, b ) \
|
|
usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
|
|
|
|
#define usc_EnableMasterIrqBit(a) \
|
|
usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
|
|
|
|
#define usc_DisableMasterIrqBit(a) \
|
|
usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
|
|
|
|
#define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
|
|
|
|
/*
|
|
* Transmit status Bits in Transmit Control status Register (TCSR)
|
|
* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
|
|
*/
|
|
|
|
#define TXSTATUS_PREAMBLE_SENT BIT7
|
|
#define TXSTATUS_IDLE_SENT BIT6
|
|
#define TXSTATUS_ABORT_SENT BIT5
|
|
#define TXSTATUS_EOF BIT4
|
|
#define TXSTATUS_CRC_SENT BIT3
|
|
#define TXSTATUS_ALL_SENT BIT2
|
|
#define TXSTATUS_UNDERRUN BIT1
|
|
#define TXSTATUS_FIFO_EMPTY BIT0
|
|
|
|
#define DICR_MASTER BIT15
|
|
#define DICR_TRANSMIT BIT0
|
|
#define DICR_RECEIVE BIT1
|
|
|
|
#define usc_EnableDmaInterrupts(a,b) \
|
|
usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
|
|
|
|
#define usc_DisableDmaInterrupts(a,b) \
|
|
usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
|
|
|
|
#define usc_EnableStatusIrqs(a,b) \
|
|
usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
|
|
|
|
#define usc_DisablestatusIrqs(a,b) \
|
|
usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
|
|
|
|
/* Transmit status Bits in Transmit Control status Register (TCSR) */
|
|
/* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
|
|
|
|
|
|
#define DISABLE_UNCONDITIONAL 0
|
|
#define DISABLE_END_OF_FRAME 1
|
|
#define ENABLE_UNCONDITIONAL 2
|
|
#define ENABLE_AUTO_CTS 3
|
|
#define ENABLE_AUTO_DCD 3
|
|
#define usc_EnableTransmitter(a,b) \
|
|
usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
|
|
#define usc_EnableReceiver(a,b) \
|
|
usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
|
|
|
|
static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
|
|
static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
|
|
static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
|
|
|
|
static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
|
|
static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
|
|
static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
|
|
void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
|
|
void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
|
|
|
|
#define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
|
|
#define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
|
|
|
|
#define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
|
|
|
|
static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
|
|
static void usc_start_receiver( struct mgsl_struct *info );
|
|
static void usc_stop_receiver( struct mgsl_struct *info );
|
|
|
|
static void usc_start_transmitter( struct mgsl_struct *info );
|
|
static void usc_stop_transmitter( struct mgsl_struct *info );
|
|
static void usc_set_txidle( struct mgsl_struct *info );
|
|
static void usc_load_txfifo( struct mgsl_struct *info );
|
|
|
|
static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
|
|
static void usc_enable_loopback( struct mgsl_struct *info, int enable );
|
|
|
|
static void usc_get_serial_signals( struct mgsl_struct *info );
|
|
static void usc_set_serial_signals( struct mgsl_struct *info );
|
|
|
|
static void usc_reset( struct mgsl_struct *info );
|
|
|
|
static void usc_set_sync_mode( struct mgsl_struct *info );
|
|
static void usc_set_sdlc_mode( struct mgsl_struct *info );
|
|
static void usc_set_async_mode( struct mgsl_struct *info );
|
|
static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
|
|
|
|
static void usc_loopback_frame( struct mgsl_struct *info );
|
|
|
|
static void mgsl_tx_timeout(unsigned long context);
|
|
|
|
|
|
static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
|
|
static void usc_loopmode_insert_request( struct mgsl_struct * info );
|
|
static int usc_loopmode_active( struct mgsl_struct * info);
|
|
static void usc_loopmode_send_done( struct mgsl_struct * info );
|
|
|
|
static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
#define dev_to_port(D) (dev_to_hdlc(D)->priv)
|
|
static void hdlcdev_tx_done(struct mgsl_struct *info);
|
|
static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
|
|
static int hdlcdev_init(struct mgsl_struct *info);
|
|
static void hdlcdev_exit(struct mgsl_struct *info);
|
|
#endif
|
|
|
|
/*
|
|
* Defines a BUS descriptor value for the PCI adapter
|
|
* local bus address ranges.
|
|
*/
|
|
|
|
#define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
|
|
(0x00400020 + \
|
|
((WrHold) << 30) + \
|
|
((WrDly) << 28) + \
|
|
((RdDly) << 26) + \
|
|
((Nwdd) << 20) + \
|
|
((Nwad) << 15) + \
|
|
((Nxda) << 13) + \
|
|
((Nrdd) << 11) + \
|
|
((Nrad) << 6) )
|
|
|
|
static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
|
|
|
|
/*
|
|
* Adapter diagnostic routines
|
|
*/
|
|
static bool mgsl_register_test( struct mgsl_struct *info );
|
|
static bool mgsl_irq_test( struct mgsl_struct *info );
|
|
static bool mgsl_dma_test( struct mgsl_struct *info );
|
|
static bool mgsl_memory_test( struct mgsl_struct *info );
|
|
static int mgsl_adapter_test( struct mgsl_struct *info );
|
|
|
|
/*
|
|
* device and resource management routines
|
|
*/
|
|
static int mgsl_claim_resources(struct mgsl_struct *info);
|
|
static void mgsl_release_resources(struct mgsl_struct *info);
|
|
static void mgsl_add_device(struct mgsl_struct *info);
|
|
static struct mgsl_struct* mgsl_allocate_device(void);
|
|
|
|
/*
|
|
* DMA buffer manupulation functions.
|
|
*/
|
|
static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
|
|
static bool mgsl_get_rx_frame( struct mgsl_struct *info );
|
|
static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
|
|
static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
|
|
static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
|
|
static int num_free_tx_dma_buffers(struct mgsl_struct *info);
|
|
static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
|
|
static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
|
|
|
|
/*
|
|
* DMA and Shared Memory buffer allocation and formatting
|
|
*/
|
|
static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
|
|
static void mgsl_free_dma_buffers(struct mgsl_struct *info);
|
|
static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
|
|
static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
|
|
static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
|
|
static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
|
|
static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
|
|
static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
|
|
static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
|
|
static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
|
|
static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
|
|
static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
|
|
|
|
/*
|
|
* Bottom half interrupt handlers
|
|
*/
|
|
static void mgsl_bh_handler(struct work_struct *work);
|
|
static void mgsl_bh_receive(struct mgsl_struct *info);
|
|
static void mgsl_bh_transmit(struct mgsl_struct *info);
|
|
static void mgsl_bh_status(struct mgsl_struct *info);
|
|
|
|
/*
|
|
* Interrupt handler routines and dispatch table.
|
|
*/
|
|
static void mgsl_isr_null( struct mgsl_struct *info );
|
|
static void mgsl_isr_transmit_data( struct mgsl_struct *info );
|
|
static void mgsl_isr_receive_data( struct mgsl_struct *info );
|
|
static void mgsl_isr_receive_status( struct mgsl_struct *info );
|
|
static void mgsl_isr_transmit_status( struct mgsl_struct *info );
|
|
static void mgsl_isr_io_pin( struct mgsl_struct *info );
|
|
static void mgsl_isr_misc( struct mgsl_struct *info );
|
|
static void mgsl_isr_receive_dma( struct mgsl_struct *info );
|
|
static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
|
|
|
|
typedef void (*isr_dispatch_func)(struct mgsl_struct *);
|
|
|
|
static isr_dispatch_func UscIsrTable[7] =
|
|
{
|
|
mgsl_isr_null,
|
|
mgsl_isr_misc,
|
|
mgsl_isr_io_pin,
|
|
mgsl_isr_transmit_data,
|
|
mgsl_isr_transmit_status,
|
|
mgsl_isr_receive_data,
|
|
mgsl_isr_receive_status
|
|
};
|
|
|
|
/*
|
|
* ioctl call handlers
|
|
*/
|
|
static int tiocmget(struct tty_struct *tty);
|
|
static int tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear);
|
|
static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
|
|
__user *user_icount);
|
|
static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
|
|
static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
|
|
static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
|
|
static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
|
|
static int mgsl_txenable(struct mgsl_struct * info, int enable);
|
|
static int mgsl_txabort(struct mgsl_struct * info);
|
|
static int mgsl_rxenable(struct mgsl_struct * info, int enable);
|
|
static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
|
|
static int mgsl_loopmode_send_done( struct mgsl_struct * info );
|
|
|
|
/* set non-zero on successful registration with PCI subsystem */
|
|
static bool pci_registered;
|
|
|
|
/*
|
|
* Global linked list of SyncLink devices
|
|
*/
|
|
static struct mgsl_struct *mgsl_device_list;
|
|
static int mgsl_device_count;
|
|
|
|
/*
|
|
* Set this param to non-zero to load eax with the
|
|
* .text section address and breakpoint on module load.
|
|
* This is useful for use with gdb and add-symbol-file command.
|
|
*/
|
|
static bool break_on_load;
|
|
|
|
/*
|
|
* Driver major number, defaults to zero to get auto
|
|
* assigned major number. May be forced as module parameter.
|
|
*/
|
|
static int ttymajor;
|
|
|
|
/*
|
|
* Array of user specified options for ISA adapters.
|
|
*/
|
|
static int io[MAX_ISA_DEVICES];
|
|
static int irq[MAX_ISA_DEVICES];
|
|
static int dma[MAX_ISA_DEVICES];
|
|
static int debug_level;
|
|
static int maxframe[MAX_TOTAL_DEVICES];
|
|
static int txdmabufs[MAX_TOTAL_DEVICES];
|
|
static int txholdbufs[MAX_TOTAL_DEVICES];
|
|
|
|
module_param(break_on_load, bool, 0);
|
|
module_param(ttymajor, int, 0);
|
|
module_param_array(io, int, NULL, 0);
|
|
module_param_array(irq, int, NULL, 0);
|
|
module_param_array(dma, int, NULL, 0);
|
|
module_param(debug_level, int, 0);
|
|
module_param_array(maxframe, int, NULL, 0);
|
|
module_param_array(txdmabufs, int, NULL, 0);
|
|
module_param_array(txholdbufs, int, NULL, 0);
|
|
|
|
static char *driver_name = "SyncLink serial driver";
|
|
static char *driver_version = "$Revision: 4.38 $";
|
|
|
|
static int synclink_init_one (struct pci_dev *dev,
|
|
const struct pci_device_id *ent);
|
|
static void synclink_remove_one (struct pci_dev *dev);
|
|
|
|
static struct pci_device_id synclink_pci_tbl[] = {
|
|
{ PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
|
|
{ PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
|
|
{ 0, }, /* terminate list */
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct pci_driver synclink_pci_driver = {
|
|
.name = "synclink",
|
|
.id_table = synclink_pci_tbl,
|
|
.probe = synclink_init_one,
|
|
.remove = __devexit_p(synclink_remove_one),
|
|
};
|
|
|
|
static struct tty_driver *serial_driver;
|
|
|
|
/* number of characters left in xmit buffer before we ask for more */
|
|
#define WAKEUP_CHARS 256
|
|
|
|
|
|
static void mgsl_change_params(struct mgsl_struct *info);
|
|
static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
|
|
|
|
/*
|
|
* 1st function defined in .text section. Calling this function in
|
|
* init_module() followed by a breakpoint allows a remote debugger
|
|
* (gdb) to get the .text address for the add-symbol-file command.
|
|
* This allows remote debugging of dynamically loadable modules.
|
|
*/
|
|
static void* mgsl_get_text_ptr(void)
|
|
{
|
|
return mgsl_get_text_ptr;
|
|
}
|
|
|
|
static inline int mgsl_paranoia_check(struct mgsl_struct *info,
|
|
char *name, const char *routine)
|
|
{
|
|
#ifdef MGSL_PARANOIA_CHECK
|
|
static const char *badmagic =
|
|
"Warning: bad magic number for mgsl struct (%s) in %s\n";
|
|
static const char *badinfo =
|
|
"Warning: null mgsl_struct for (%s) in %s\n";
|
|
|
|
if (!info) {
|
|
printk(badinfo, name, routine);
|
|
return 1;
|
|
}
|
|
if (info->magic != MGSL_MAGIC) {
|
|
printk(badmagic, name, routine);
|
|
return 1;
|
|
}
|
|
#else
|
|
if (!info)
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* line discipline callback wrappers
|
|
*
|
|
* The wrappers maintain line discipline references
|
|
* while calling into the line discipline.
|
|
*
|
|
* ldisc_receive_buf - pass receive data to line discipline
|
|
*/
|
|
|
|
static void ldisc_receive_buf(struct tty_struct *tty,
|
|
const __u8 *data, char *flags, int count)
|
|
{
|
|
struct tty_ldisc *ld;
|
|
if (!tty)
|
|
return;
|
|
ld = tty_ldisc_ref(tty);
|
|
if (ld) {
|
|
if (ld->ops->receive_buf)
|
|
ld->ops->receive_buf(tty, data, flags, count);
|
|
tty_ldisc_deref(ld);
|
|
}
|
|
}
|
|
|
|
/* mgsl_stop() throttle (stop) transmitter
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_stop(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
|
|
return;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("mgsl_stop(%s)\n",info->device_name);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (info->tx_enabled)
|
|
usc_stop_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
} /* end of mgsl_stop() */
|
|
|
|
/* mgsl_start() release (start) transmitter
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_start(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
|
|
return;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("mgsl_start(%s)\n",info->device_name);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (!info->tx_enabled)
|
|
usc_start_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
} /* end of mgsl_start() */
|
|
|
|
/*
|
|
* Bottom half work queue access functions
|
|
*/
|
|
|
|
/* mgsl_bh_action() Return next bottom half action to perform.
|
|
* Return Value: BH action code or 0 if nothing to do.
|
|
*/
|
|
static int mgsl_bh_action(struct mgsl_struct *info)
|
|
{
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
if (info->pending_bh & BH_RECEIVE) {
|
|
info->pending_bh &= ~BH_RECEIVE;
|
|
rc = BH_RECEIVE;
|
|
} else if (info->pending_bh & BH_TRANSMIT) {
|
|
info->pending_bh &= ~BH_TRANSMIT;
|
|
rc = BH_TRANSMIT;
|
|
} else if (info->pending_bh & BH_STATUS) {
|
|
info->pending_bh &= ~BH_STATUS;
|
|
rc = BH_STATUS;
|
|
}
|
|
|
|
if (!rc) {
|
|
/* Mark BH routine as complete */
|
|
info->bh_running = false;
|
|
info->bh_requested = false;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Perform bottom half processing of work items queued by ISR.
|
|
*/
|
|
static void mgsl_bh_handler(struct work_struct *work)
|
|
{
|
|
struct mgsl_struct *info =
|
|
container_of(work, struct mgsl_struct, task);
|
|
int action;
|
|
|
|
if (!info)
|
|
return;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
|
|
info->bh_running = true;
|
|
|
|
while((action = mgsl_bh_action(info)) != 0) {
|
|
|
|
/* Process work item */
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
|
|
__FILE__,__LINE__,action);
|
|
|
|
switch (action) {
|
|
|
|
case BH_RECEIVE:
|
|
mgsl_bh_receive(info);
|
|
break;
|
|
case BH_TRANSMIT:
|
|
mgsl_bh_transmit(info);
|
|
break;
|
|
case BH_STATUS:
|
|
mgsl_bh_status(info);
|
|
break;
|
|
default:
|
|
/* unknown work item ID */
|
|
printk("Unknown work item ID=%08X!\n", action);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
}
|
|
|
|
static void mgsl_bh_receive(struct mgsl_struct *info)
|
|
{
|
|
bool (*get_rx_frame)(struct mgsl_struct *info) =
|
|
(info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_receive(%s)\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
|
|
do
|
|
{
|
|
if (info->rx_rcc_underrun) {
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_start_receiver(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return;
|
|
}
|
|
} while(get_rx_frame(info));
|
|
}
|
|
|
|
static void mgsl_bh_transmit(struct mgsl_struct *info)
|
|
{
|
|
struct tty_struct *tty = info->port.tty;
|
|
unsigned long flags;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
|
|
if (tty)
|
|
tty_wakeup(tty);
|
|
|
|
/* if transmitter idle and loopmode_send_done_requested
|
|
* then start echoing RxD to TxD
|
|
*/
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if ( !info->tx_active && info->loopmode_send_done_requested )
|
|
usc_loopmode_send_done( info );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
static void mgsl_bh_status(struct mgsl_struct *info)
|
|
{
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk( "%s(%d):mgsl_bh_status() entry on %s\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
|
|
info->ri_chkcount = 0;
|
|
info->dsr_chkcount = 0;
|
|
info->dcd_chkcount = 0;
|
|
info->cts_chkcount = 0;
|
|
}
|
|
|
|
/* mgsl_isr_receive_status()
|
|
*
|
|
* Service a receive status interrupt. The type of status
|
|
* interrupt is indicated by the state of the RCSR.
|
|
* This is only used for HDLC mode.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_receive_status( struct mgsl_struct *info )
|
|
{
|
|
u16 status = usc_InReg( info, RCSR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
|
|
__FILE__,__LINE__,status);
|
|
|
|
if ( (status & RXSTATUS_ABORT_RECEIVED) &&
|
|
info->loopmode_insert_requested &&
|
|
usc_loopmode_active(info) )
|
|
{
|
|
++info->icount.rxabort;
|
|
info->loopmode_insert_requested = false;
|
|
|
|
/* clear CMR:13 to start echoing RxD to TxD */
|
|
info->cmr_value &= ~BIT13;
|
|
usc_OutReg(info, CMR, info->cmr_value);
|
|
|
|
/* disable received abort irq (no longer required) */
|
|
usc_OutReg(info, RICR,
|
|
(usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
|
|
}
|
|
|
|
if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
|
|
if (status & RXSTATUS_EXITED_HUNT)
|
|
info->icount.exithunt++;
|
|
if (status & RXSTATUS_IDLE_RECEIVED)
|
|
info->icount.rxidle++;
|
|
wake_up_interruptible(&info->event_wait_q);
|
|
}
|
|
|
|
if (status & RXSTATUS_OVERRUN){
|
|
info->icount.rxover++;
|
|
usc_process_rxoverrun_sync( info );
|
|
}
|
|
|
|
usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
|
|
usc_UnlatchRxstatusBits( info, status );
|
|
|
|
} /* end of mgsl_isr_receive_status() */
|
|
|
|
/* mgsl_isr_transmit_status()
|
|
*
|
|
* Service a transmit status interrupt
|
|
* HDLC mode :end of transmit frame
|
|
* Async mode:all data is sent
|
|
* transmit status is indicated by bits in the TCSR.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_transmit_status( struct mgsl_struct *info )
|
|
{
|
|
u16 status = usc_InReg( info, TCSR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
|
|
__FILE__,__LINE__,status);
|
|
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
|
|
usc_UnlatchTxstatusBits( info, status );
|
|
|
|
if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
|
|
{
|
|
/* finished sending HDLC abort. This may leave */
|
|
/* the TxFifo with data from the aborted frame */
|
|
/* so purge the TxFifo. Also shutdown the DMA */
|
|
/* channel in case there is data remaining in */
|
|
/* the DMA buffer */
|
|
usc_DmaCmd( info, DmaCmd_ResetTxChannel );
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
}
|
|
|
|
if ( status & TXSTATUS_EOF_SENT )
|
|
info->icount.txok++;
|
|
else if ( status & TXSTATUS_UNDERRUN )
|
|
info->icount.txunder++;
|
|
else if ( status & TXSTATUS_ABORT_SENT )
|
|
info->icount.txabort++;
|
|
else
|
|
info->icount.txunder++;
|
|
|
|
info->tx_active = false;
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
del_timer(&info->tx_timer);
|
|
|
|
if ( info->drop_rts_on_tx_done ) {
|
|
usc_get_serial_signals( info );
|
|
if ( info->serial_signals & SerialSignal_RTS ) {
|
|
info->serial_signals &= ~SerialSignal_RTS;
|
|
usc_set_serial_signals( info );
|
|
}
|
|
info->drop_rts_on_tx_done = false;
|
|
}
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
if (info->netcount)
|
|
hdlcdev_tx_done(info);
|
|
else
|
|
#endif
|
|
{
|
|
if (info->port.tty->stopped || info->port.tty->hw_stopped) {
|
|
usc_stop_transmitter(info);
|
|
return;
|
|
}
|
|
info->pending_bh |= BH_TRANSMIT;
|
|
}
|
|
|
|
} /* end of mgsl_isr_transmit_status() */
|
|
|
|
/* mgsl_isr_io_pin()
|
|
*
|
|
* Service an Input/Output pin interrupt. The type of
|
|
* interrupt is indicated by bits in the MISR
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_io_pin( struct mgsl_struct *info )
|
|
{
|
|
struct mgsl_icount *icount;
|
|
u16 status = usc_InReg( info, MISR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
|
|
__FILE__,__LINE__,status);
|
|
|
|
usc_ClearIrqPendingBits( info, IO_PIN );
|
|
usc_UnlatchIostatusBits( info, status );
|
|
|
|
if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
|
|
MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
|
|
icount = &info->icount;
|
|
/* update input line counters */
|
|
if (status & MISCSTATUS_RI_LATCHED) {
|
|
if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
|
|
usc_DisablestatusIrqs(info,SICR_RI);
|
|
icount->rng++;
|
|
if ( status & MISCSTATUS_RI )
|
|
info->input_signal_events.ri_up++;
|
|
else
|
|
info->input_signal_events.ri_down++;
|
|
}
|
|
if (status & MISCSTATUS_DSR_LATCHED) {
|
|
if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
|
|
usc_DisablestatusIrqs(info,SICR_DSR);
|
|
icount->dsr++;
|
|
if ( status & MISCSTATUS_DSR )
|
|
info->input_signal_events.dsr_up++;
|
|
else
|
|
info->input_signal_events.dsr_down++;
|
|
}
|
|
if (status & MISCSTATUS_DCD_LATCHED) {
|
|
if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
|
|
usc_DisablestatusIrqs(info,SICR_DCD);
|
|
icount->dcd++;
|
|
if (status & MISCSTATUS_DCD) {
|
|
info->input_signal_events.dcd_up++;
|
|
} else
|
|
info->input_signal_events.dcd_down++;
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
if (info->netcount) {
|
|
if (status & MISCSTATUS_DCD)
|
|
netif_carrier_on(info->netdev);
|
|
else
|
|
netif_carrier_off(info->netdev);
|
|
}
|
|
#endif
|
|
}
|
|
if (status & MISCSTATUS_CTS_LATCHED)
|
|
{
|
|
if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
|
|
usc_DisablestatusIrqs(info,SICR_CTS);
|
|
icount->cts++;
|
|
if ( status & MISCSTATUS_CTS )
|
|
info->input_signal_events.cts_up++;
|
|
else
|
|
info->input_signal_events.cts_down++;
|
|
}
|
|
wake_up_interruptible(&info->status_event_wait_q);
|
|
wake_up_interruptible(&info->event_wait_q);
|
|
|
|
if ( (info->port.flags & ASYNC_CHECK_CD) &&
|
|
(status & MISCSTATUS_DCD_LATCHED) ) {
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s CD now %s...", info->device_name,
|
|
(status & MISCSTATUS_DCD) ? "on" : "off");
|
|
if (status & MISCSTATUS_DCD)
|
|
wake_up_interruptible(&info->port.open_wait);
|
|
else {
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("doing serial hangup...");
|
|
if (info->port.tty)
|
|
tty_hangup(info->port.tty);
|
|
}
|
|
}
|
|
|
|
if (tty_port_cts_enabled(&info->port) &&
|
|
(status & MISCSTATUS_CTS_LATCHED) ) {
|
|
if (info->port.tty->hw_stopped) {
|
|
if (status & MISCSTATUS_CTS) {
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("CTS tx start...");
|
|
if (info->port.tty)
|
|
info->port.tty->hw_stopped = 0;
|
|
usc_start_transmitter(info);
|
|
info->pending_bh |= BH_TRANSMIT;
|
|
return;
|
|
}
|
|
} else {
|
|
if (!(status & MISCSTATUS_CTS)) {
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("CTS tx stop...");
|
|
if (info->port.tty)
|
|
info->port.tty->hw_stopped = 1;
|
|
usc_stop_transmitter(info);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
info->pending_bh |= BH_STATUS;
|
|
|
|
/* for diagnostics set IRQ flag */
|
|
if ( status & MISCSTATUS_TXC_LATCHED ){
|
|
usc_OutReg( info, SICR,
|
|
(unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
|
|
usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
|
|
info->irq_occurred = true;
|
|
}
|
|
|
|
} /* end of mgsl_isr_io_pin() */
|
|
|
|
/* mgsl_isr_transmit_data()
|
|
*
|
|
* Service a transmit data interrupt (async mode only).
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_transmit_data( struct mgsl_struct *info )
|
|
{
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
|
|
__FILE__,__LINE__,info->xmit_cnt);
|
|
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
|
|
|
|
if (info->port.tty->stopped || info->port.tty->hw_stopped) {
|
|
usc_stop_transmitter(info);
|
|
return;
|
|
}
|
|
|
|
if ( info->xmit_cnt )
|
|
usc_load_txfifo( info );
|
|
else
|
|
info->tx_active = false;
|
|
|
|
if (info->xmit_cnt < WAKEUP_CHARS)
|
|
info->pending_bh |= BH_TRANSMIT;
|
|
|
|
} /* end of mgsl_isr_transmit_data() */
|
|
|
|
/* mgsl_isr_receive_data()
|
|
*
|
|
* Service a receive data interrupt. This occurs
|
|
* when operating in asynchronous interrupt transfer mode.
|
|
* The receive data FIFO is flushed to the receive data buffers.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_receive_data( struct mgsl_struct *info )
|
|
{
|
|
int Fifocount;
|
|
u16 status;
|
|
int work = 0;
|
|
unsigned char DataByte;
|
|
struct tty_struct *tty = info->port.tty;
|
|
struct mgsl_icount *icount = &info->icount;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_receive_data\n",
|
|
__FILE__,__LINE__);
|
|
|
|
usc_ClearIrqPendingBits( info, RECEIVE_DATA );
|
|
|
|
/* select FIFO status for RICR readback */
|
|
usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
|
|
|
|
/* clear the Wordstatus bit so that status readback */
|
|
/* only reflects the status of this byte */
|
|
usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
|
|
|
|
/* flush the receive FIFO */
|
|
|
|
while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
|
|
int flag;
|
|
|
|
/* read one byte from RxFIFO */
|
|
outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
|
|
info->io_base + CCAR );
|
|
DataByte = inb( info->io_base + CCAR );
|
|
|
|
/* get the status of the received byte */
|
|
status = usc_InReg(info, RCSR);
|
|
if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
|
|
RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
|
|
usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
|
|
|
|
icount->rx++;
|
|
|
|
flag = 0;
|
|
if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
|
|
RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
|
|
printk("rxerr=%04X\n",status);
|
|
/* update error statistics */
|
|
if ( status & RXSTATUS_BREAK_RECEIVED ) {
|
|
status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
|
|
icount->brk++;
|
|
} else if (status & RXSTATUS_PARITY_ERROR)
|
|
icount->parity++;
|
|
else if (status & RXSTATUS_FRAMING_ERROR)
|
|
icount->frame++;
|
|
else if (status & RXSTATUS_OVERRUN) {
|
|
/* must issue purge fifo cmd before */
|
|
/* 16C32 accepts more receive chars */
|
|
usc_RTCmd(info,RTCmd_PurgeRxFifo);
|
|
icount->overrun++;
|
|
}
|
|
|
|
/* discard char if tty control flags say so */
|
|
if (status & info->ignore_status_mask)
|
|
continue;
|
|
|
|
status &= info->read_status_mask;
|
|
|
|
if (status & RXSTATUS_BREAK_RECEIVED) {
|
|
flag = TTY_BREAK;
|
|
if (info->port.flags & ASYNC_SAK)
|
|
do_SAK(tty);
|
|
} else if (status & RXSTATUS_PARITY_ERROR)
|
|
flag = TTY_PARITY;
|
|
else if (status & RXSTATUS_FRAMING_ERROR)
|
|
flag = TTY_FRAME;
|
|
} /* end of if (error) */
|
|
tty_insert_flip_char(tty, DataByte, flag);
|
|
if (status & RXSTATUS_OVERRUN) {
|
|
/* Overrun is special, since it's
|
|
* reported immediately, and doesn't
|
|
* affect the current character
|
|
*/
|
|
work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
|
}
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR ) {
|
|
printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
|
|
__FILE__,__LINE__,icount->rx,icount->brk,
|
|
icount->parity,icount->frame,icount->overrun);
|
|
}
|
|
|
|
if(work)
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
|
|
/* mgsl_isr_misc()
|
|
*
|
|
* Service a miscellaneous interrupt source.
|
|
*
|
|
* Arguments: info pointer to device extension (instance data)
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_misc( struct mgsl_struct *info )
|
|
{
|
|
u16 status = usc_InReg( info, MISR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_misc status=%04X\n",
|
|
__FILE__,__LINE__,status);
|
|
|
|
if ((status & MISCSTATUS_RCC_UNDERRUN) &&
|
|
(info->params.mode == MGSL_MODE_HDLC)) {
|
|
|
|
/* turn off receiver and rx DMA */
|
|
usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
|
|
usc_DmaCmd(info, DmaCmd_ResetRxChannel);
|
|
usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
|
|
usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
|
|
usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
|
|
|
|
/* schedule BH handler to restart receiver */
|
|
info->pending_bh |= BH_RECEIVE;
|
|
info->rx_rcc_underrun = true;
|
|
}
|
|
|
|
usc_ClearIrqPendingBits( info, MISC );
|
|
usc_UnlatchMiscstatusBits( info, status );
|
|
|
|
} /* end of mgsl_isr_misc() */
|
|
|
|
/* mgsl_isr_null()
|
|
*
|
|
* Services undefined interrupt vectors from the
|
|
* USC. (hence this function SHOULD never be called)
|
|
*
|
|
* Arguments: info pointer to device extension (instance data)
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_null( struct mgsl_struct *info )
|
|
{
|
|
|
|
} /* end of mgsl_isr_null() */
|
|
|
|
/* mgsl_isr_receive_dma()
|
|
*
|
|
* Service a receive DMA channel interrupt.
|
|
* For this driver there are two sources of receive DMA interrupts
|
|
* as identified in the Receive DMA mode Register (RDMR):
|
|
*
|
|
* BIT3 EOA/EOL End of List, all receive buffers in receive
|
|
* buffer list have been filled (no more free buffers
|
|
* available). The DMA controller has shut down.
|
|
*
|
|
* BIT2 EOB End of Buffer. This interrupt occurs when a receive
|
|
* DMA buffer is terminated in response to completion
|
|
* of a good frame or a frame with errors. The status
|
|
* of the frame is stored in the buffer entry in the
|
|
* list of receive buffer entries.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_receive_dma( struct mgsl_struct *info )
|
|
{
|
|
u16 status;
|
|
|
|
/* clear interrupt pending and IUS bit for Rx DMA IRQ */
|
|
usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
|
|
|
|
/* Read the receive DMA status to identify interrupt type. */
|
|
/* This also clears the status bits. */
|
|
status = usc_InDmaReg( info, RDMR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
|
|
__FILE__,__LINE__,info->device_name,status);
|
|
|
|
info->pending_bh |= BH_RECEIVE;
|
|
|
|
if ( status & BIT3 ) {
|
|
info->rx_overflow = true;
|
|
info->icount.buf_overrun++;
|
|
}
|
|
|
|
} /* end of mgsl_isr_receive_dma() */
|
|
|
|
/* mgsl_isr_transmit_dma()
|
|
*
|
|
* This function services a transmit DMA channel interrupt.
|
|
*
|
|
* For this driver there is one source of transmit DMA interrupts
|
|
* as identified in the Transmit DMA Mode Register (TDMR):
|
|
*
|
|
* BIT2 EOB End of Buffer. This interrupt occurs when a
|
|
* transmit DMA buffer has been emptied.
|
|
*
|
|
* The driver maintains enough transmit DMA buffers to hold at least
|
|
* one max frame size transmit frame. When operating in a buffered
|
|
* transmit mode, there may be enough transmit DMA buffers to hold at
|
|
* least two or more max frame size frames. On an EOB condition,
|
|
* determine if there are any queued transmit buffers and copy into
|
|
* transmit DMA buffers if we have room.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
|
|
{
|
|
u16 status;
|
|
|
|
/* clear interrupt pending and IUS bit for Tx DMA IRQ */
|
|
usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
|
|
|
|
/* Read the transmit DMA status to identify interrupt type. */
|
|
/* This also clears the status bits. */
|
|
|
|
status = usc_InDmaReg( info, TDMR );
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
|
|
__FILE__,__LINE__,info->device_name,status);
|
|
|
|
if ( status & BIT2 ) {
|
|
--info->tx_dma_buffers_used;
|
|
|
|
/* if there are transmit frames queued,
|
|
* try to load the next one
|
|
*/
|
|
if ( load_next_tx_holding_buffer(info) ) {
|
|
/* if call returns non-zero value, we have
|
|
* at least one free tx holding buffer
|
|
*/
|
|
info->pending_bh |= BH_TRANSMIT;
|
|
}
|
|
}
|
|
|
|
} /* end of mgsl_isr_transmit_dma() */
|
|
|
|
/* mgsl_interrupt()
|
|
*
|
|
* Interrupt service routine entry point.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* irq interrupt number that caused interrupt
|
|
* dev_id device ID supplied during interrupt registration
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
|
|
{
|
|
struct mgsl_struct *info = dev_id;
|
|
u16 UscVector;
|
|
u16 DmaVector;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
|
|
__FILE__, __LINE__, info->irq_level);
|
|
|
|
spin_lock(&info->irq_spinlock);
|
|
|
|
for(;;) {
|
|
/* Read the interrupt vectors from hardware. */
|
|
UscVector = usc_InReg(info, IVR) >> 9;
|
|
DmaVector = usc_InDmaReg(info, DIVR);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
|
|
__FILE__,__LINE__,info->device_name,UscVector,DmaVector);
|
|
|
|
if ( !UscVector && !DmaVector )
|
|
break;
|
|
|
|
/* Dispatch interrupt vector */
|
|
if ( UscVector )
|
|
(*UscIsrTable[UscVector])(info);
|
|
else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
|
|
mgsl_isr_transmit_dma(info);
|
|
else
|
|
mgsl_isr_receive_dma(info);
|
|
|
|
if ( info->isr_overflow ) {
|
|
printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
|
|
__FILE__, __LINE__, info->device_name, info->irq_level);
|
|
usc_DisableMasterIrqBit(info);
|
|
usc_DisableDmaInterrupts(info,DICR_MASTER);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Request bottom half processing if there's something
|
|
* for it to do and the bh is not already running
|
|
*/
|
|
|
|
if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk("%s(%d):%s queueing bh task.\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
schedule_work(&info->task);
|
|
info->bh_requested = true;
|
|
}
|
|
|
|
spin_unlock(&info->irq_spinlock);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_ISR )
|
|
printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
|
|
__FILE__, __LINE__, info->irq_level);
|
|
|
|
return IRQ_HANDLED;
|
|
} /* end of mgsl_interrupt() */
|
|
|
|
/* startup()
|
|
*
|
|
* Initialize and start device.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int startup(struct mgsl_struct * info)
|
|
{
|
|
int retval = 0;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
|
|
|
|
if (info->port.flags & ASYNC_INITIALIZED)
|
|
return 0;
|
|
|
|
if (!info->xmit_buf) {
|
|
/* allocate a page of memory for a transmit buffer */
|
|
info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!info->xmit_buf) {
|
|
printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
info->pending_bh = 0;
|
|
|
|
memset(&info->icount, 0, sizeof(info->icount));
|
|
|
|
setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
|
|
|
|
/* Allocate and claim adapter resources */
|
|
retval = mgsl_claim_resources(info);
|
|
|
|
/* perform existence check and diagnostics */
|
|
if ( !retval )
|
|
retval = mgsl_adapter_test(info);
|
|
|
|
if ( retval ) {
|
|
if (capable(CAP_SYS_ADMIN) && info->port.tty)
|
|
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
|
|
mgsl_release_resources(info);
|
|
return retval;
|
|
}
|
|
|
|
/* program hardware for current parameters */
|
|
mgsl_change_params(info);
|
|
|
|
if (info->port.tty)
|
|
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
|
|
|
|
info->port.flags |= ASYNC_INITIALIZED;
|
|
|
|
return 0;
|
|
|
|
} /* end of startup() */
|
|
|
|
/* shutdown()
|
|
*
|
|
* Called by mgsl_close() and mgsl_hangup() to shutdown hardware
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void shutdown(struct mgsl_struct * info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!(info->port.flags & ASYNC_INITIALIZED))
|
|
return;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_shutdown(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
/* clear status wait queue because status changes */
|
|
/* can't happen after shutting down the hardware */
|
|
wake_up_interruptible(&info->status_event_wait_q);
|
|
wake_up_interruptible(&info->event_wait_q);
|
|
|
|
del_timer_sync(&info->tx_timer);
|
|
|
|
if (info->xmit_buf) {
|
|
free_page((unsigned long) info->xmit_buf);
|
|
info->xmit_buf = NULL;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_DisableMasterIrqBit(info);
|
|
usc_stop_receiver(info);
|
|
usc_stop_transmitter(info);
|
|
usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
|
|
TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
|
|
usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
|
|
|
|
/* Disable DMAEN (Port 7, Bit 14) */
|
|
/* This disconnects the DMA request signal from the ISA bus */
|
|
/* on the ISA adapter. This has no effect for the PCI adapter */
|
|
usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
|
|
|
|
/* Disable INTEN (Port 6, Bit12) */
|
|
/* This disconnects the IRQ request signal to the ISA bus */
|
|
/* on the ISA adapter. This has no effect for the PCI adapter */
|
|
usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
|
|
|
|
if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
|
|
info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
|
|
usc_set_serial_signals(info);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
mgsl_release_resources(info);
|
|
|
|
if (info->port.tty)
|
|
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
|
|
|
|
info->port.flags &= ~ASYNC_INITIALIZED;
|
|
|
|
} /* end of shutdown() */
|
|
|
|
static void mgsl_program_hw(struct mgsl_struct *info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
usc_stop_receiver(info);
|
|
usc_stop_transmitter(info);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
if (info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ||
|
|
info->netcount)
|
|
usc_set_sync_mode(info);
|
|
else
|
|
usc_set_async_mode(info);
|
|
|
|
usc_set_serial_signals(info);
|
|
|
|
info->dcd_chkcount = 0;
|
|
info->cts_chkcount = 0;
|
|
info->ri_chkcount = 0;
|
|
info->dsr_chkcount = 0;
|
|
|
|
usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
|
|
usc_EnableInterrupts(info, IO_PIN);
|
|
usc_get_serial_signals(info);
|
|
|
|
if (info->netcount || info->port.tty->termios.c_cflag & CREAD)
|
|
usc_start_receiver(info);
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
/* Reconfigure adapter based on new parameters
|
|
*/
|
|
static void mgsl_change_params(struct mgsl_struct *info)
|
|
{
|
|
unsigned cflag;
|
|
int bits_per_char;
|
|
|
|
if (!info->port.tty)
|
|
return;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_change_params(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
cflag = info->port.tty->termios.c_cflag;
|
|
|
|
/* if B0 rate (hangup) specified then negate DTR and RTS */
|
|
/* otherwise assert DTR and RTS */
|
|
if (cflag & CBAUD)
|
|
info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
|
|
else
|
|
info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
|
|
|
|
/* byte size and parity */
|
|
|
|
switch (cflag & CSIZE) {
|
|
case CS5: info->params.data_bits = 5; break;
|
|
case CS6: info->params.data_bits = 6; break;
|
|
case CS7: info->params.data_bits = 7; break;
|
|
case CS8: info->params.data_bits = 8; break;
|
|
/* Never happens, but GCC is too dumb to figure it out */
|
|
default: info->params.data_bits = 7; break;
|
|
}
|
|
|
|
if (cflag & CSTOPB)
|
|
info->params.stop_bits = 2;
|
|
else
|
|
info->params.stop_bits = 1;
|
|
|
|
info->params.parity = ASYNC_PARITY_NONE;
|
|
if (cflag & PARENB) {
|
|
if (cflag & PARODD)
|
|
info->params.parity = ASYNC_PARITY_ODD;
|
|
else
|
|
info->params.parity = ASYNC_PARITY_EVEN;
|
|
#ifdef CMSPAR
|
|
if (cflag & CMSPAR)
|
|
info->params.parity = ASYNC_PARITY_SPACE;
|
|
#endif
|
|
}
|
|
|
|
/* calculate number of jiffies to transmit a full
|
|
* FIFO (32 bytes) at specified data rate
|
|
*/
|
|
bits_per_char = info->params.data_bits +
|
|
info->params.stop_bits + 1;
|
|
|
|
/* if port data rate is set to 460800 or less then
|
|
* allow tty settings to override, otherwise keep the
|
|
* current data rate.
|
|
*/
|
|
if (info->params.data_rate <= 460800)
|
|
info->params.data_rate = tty_get_baud_rate(info->port.tty);
|
|
|
|
if ( info->params.data_rate ) {
|
|
info->timeout = (32*HZ*bits_per_char) /
|
|
info->params.data_rate;
|
|
}
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
|
|
|
if (cflag & CRTSCTS)
|
|
info->port.flags |= ASYNC_CTS_FLOW;
|
|
else
|
|
info->port.flags &= ~ASYNC_CTS_FLOW;
|
|
|
|
if (cflag & CLOCAL)
|
|
info->port.flags &= ~ASYNC_CHECK_CD;
|
|
else
|
|
info->port.flags |= ASYNC_CHECK_CD;
|
|
|
|
/* process tty input control flags */
|
|
|
|
info->read_status_mask = RXSTATUS_OVERRUN;
|
|
if (I_INPCK(info->port.tty))
|
|
info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
|
|
if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
|
|
info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
|
|
|
|
if (I_IGNPAR(info->port.tty))
|
|
info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
|
|
if (I_IGNBRK(info->port.tty)) {
|
|
info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
|
|
/* If ignoring parity and break indicators, ignore
|
|
* overruns too. (For real raw support).
|
|
*/
|
|
if (I_IGNPAR(info->port.tty))
|
|
info->ignore_status_mask |= RXSTATUS_OVERRUN;
|
|
}
|
|
|
|
mgsl_program_hw(info);
|
|
|
|
} /* end of mgsl_change_params() */
|
|
|
|
/* mgsl_put_char()
|
|
*
|
|
* Add a character to the transmit buffer.
|
|
*
|
|
* Arguments: tty pointer to tty information structure
|
|
* ch character to add to transmit buffer
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO) {
|
|
printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
|
|
__FILE__, __LINE__, ch, info->device_name);
|
|
}
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
|
|
return 0;
|
|
|
|
if (!info->xmit_buf)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock, flags);
|
|
|
|
if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
|
|
if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
|
|
info->xmit_buf[info->xmit_head++] = ch;
|
|
info->xmit_head &= SERIAL_XMIT_SIZE-1;
|
|
info->xmit_cnt++;
|
|
ret = 1;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock, flags);
|
|
return ret;
|
|
|
|
} /* end of mgsl_put_char() */
|
|
|
|
/* mgsl_flush_chars()
|
|
*
|
|
* Enable transmitter so remaining characters in the
|
|
* transmit buffer are sent.
|
|
*
|
|
* Arguments: tty pointer to tty information structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
|
|
__FILE__,__LINE__,info->device_name,info->xmit_cnt);
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
|
|
return;
|
|
|
|
if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
|
|
!info->xmit_buf)
|
|
return;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
|
|
__FILE__,__LINE__,info->device_name );
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
if (!info->tx_active) {
|
|
if ( (info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
|
|
/* operating in synchronous (frame oriented) mode */
|
|
/* copy data from circular xmit_buf to */
|
|
/* transmit DMA buffer. */
|
|
mgsl_load_tx_dma_buffer(info,
|
|
info->xmit_buf,info->xmit_cnt);
|
|
}
|
|
usc_start_transmitter(info);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
} /* end of mgsl_flush_chars() */
|
|
|
|
/* mgsl_write()
|
|
*
|
|
* Send a block of data
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty information structure
|
|
* buf pointer to buffer containing send data
|
|
* count size of send data in bytes
|
|
*
|
|
* Return Value: number of characters written
|
|
*/
|
|
static int mgsl_write(struct tty_struct * tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
int c, ret = 0;
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_write(%s) count=%d\n",
|
|
__FILE__,__LINE__,info->device_name,count);
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
|
|
goto cleanup;
|
|
|
|
if (!info->xmit_buf)
|
|
goto cleanup;
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
/* operating in synchronous (frame oriented) mode */
|
|
if (info->tx_active) {
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ) {
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
/* transmitter is actively sending data -
|
|
* if we have multiple transmit dma and
|
|
* holding buffers, attempt to queue this
|
|
* frame for transmission at a later time.
|
|
*/
|
|
if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
|
|
/* no tx holding buffers available */
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* queue transmit frame request */
|
|
ret = count;
|
|
save_tx_buffer_request(info,buf,count);
|
|
|
|
/* if we have sufficient tx dma buffers,
|
|
* load the next buffered tx request
|
|
*/
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
load_next_tx_holding_buffer(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* if operating in HDLC LoopMode and the adapter */
|
|
/* has yet to be inserted into the loop, we can't */
|
|
/* transmit */
|
|
|
|
if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
|
|
!usc_loopmode_active(info) )
|
|
{
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
|
|
if ( info->xmit_cnt ) {
|
|
/* Send accumulated from send_char() calls */
|
|
/* as frame and wait before accepting more data. */
|
|
ret = 0;
|
|
|
|
/* copy data from circular xmit_buf to */
|
|
/* transmit DMA buffer. */
|
|
mgsl_load_tx_dma_buffer(info,
|
|
info->xmit_buf,info->xmit_cnt);
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
} else {
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
ret = count;
|
|
info->xmit_cnt = count;
|
|
mgsl_load_tx_dma_buffer(info,buf,count);
|
|
}
|
|
} else {
|
|
while (1) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
c = min_t(int, count,
|
|
min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
|
|
SERIAL_XMIT_SIZE - info->xmit_head));
|
|
if (c <= 0) {
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
break;
|
|
}
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
|
info->xmit_head = ((info->xmit_head + c) &
|
|
(SERIAL_XMIT_SIZE-1));
|
|
info->xmit_cnt += c;
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
}
|
|
|
|
if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (!info->tx_active)
|
|
usc_start_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
cleanup:
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_write(%s) returning=%d\n",
|
|
__FILE__,__LINE__,info->device_name,ret);
|
|
|
|
return ret;
|
|
|
|
} /* end of mgsl_write() */
|
|
|
|
/* mgsl_write_room()
|
|
*
|
|
* Return the count of free bytes in transmit buffer
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static int mgsl_write_room(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
int ret;
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
|
|
return 0;
|
|
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
|
|
if (ret < 0)
|
|
ret = 0;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_write_room(%s)=%d\n",
|
|
__FILE__,__LINE__, info->device_name,ret );
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
/* operating in synchronous (frame oriented) mode */
|
|
if ( info->tx_active )
|
|
return 0;
|
|
else
|
|
return HDLC_MAX_FRAME_SIZE;
|
|
}
|
|
|
|
return ret;
|
|
|
|
} /* end of mgsl_write_room() */
|
|
|
|
/* mgsl_chars_in_buffer()
|
|
*
|
|
* Return the count of bytes in transmit buffer
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static int mgsl_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
|
|
return 0;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
|
|
__FILE__,__LINE__, info->device_name,info->xmit_cnt );
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
/* operating in synchronous (frame oriented) mode */
|
|
if ( info->tx_active )
|
|
return info->max_frame_size;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
return info->xmit_cnt;
|
|
} /* end of mgsl_chars_in_buffer() */
|
|
|
|
/* mgsl_flush_buffer()
|
|
*
|
|
* Discard all data in the send buffer
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
del_timer(&info->tx_timer);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/* mgsl_send_xchar()
|
|
*
|
|
* Send a high-priority XON/XOFF character
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* ch character to send
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
|
|
__FILE__,__LINE__, info->device_name, ch );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
|
|
return;
|
|
|
|
info->x_char = ch;
|
|
if (ch) {
|
|
/* Make sure transmit interrupts are on */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (!info->tx_enabled)
|
|
usc_start_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
} /* end of mgsl_send_xchar() */
|
|
|
|
/* mgsl_throttle()
|
|
*
|
|
* Signal remote device to throttle send data (our receive data)
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_throttle(struct tty_struct * tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_throttle(%s) entry\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty))
|
|
mgsl_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
if (tty->termios.c_cflag & CRTSCTS) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
info->serial_signals &= ~SerialSignal_RTS;
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
} /* end of mgsl_throttle() */
|
|
|
|
/* mgsl_unthrottle()
|
|
*
|
|
* Signal remote device to stop throttling send data (our receive data)
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_unthrottle(%s) entry\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else
|
|
mgsl_send_xchar(tty, START_CHAR(tty));
|
|
}
|
|
|
|
if (tty->termios.c_cflag & CRTSCTS) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
info->serial_signals |= SerialSignal_RTS;
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
} /* end of mgsl_unthrottle() */
|
|
|
|
/* mgsl_get_stats()
|
|
*
|
|
* get the current serial parameters information
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* user_icount pointer to buffer to hold returned stats
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
|
|
{
|
|
int err;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_get_params(%s)\n",
|
|
__FILE__,__LINE__, info->device_name);
|
|
|
|
if (!user_icount) {
|
|
memset(&info->icount, 0, sizeof(info->icount));
|
|
} else {
|
|
mutex_lock(&info->port.mutex);
|
|
COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
|
|
mutex_unlock(&info->port.mutex);
|
|
if (err)
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_get_stats() */
|
|
|
|
/* mgsl_get_params()
|
|
*
|
|
* get the current serial parameters information
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* user_params pointer to buffer to hold returned params
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
|
|
{
|
|
int err;
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_get_params(%s)\n",
|
|
__FILE__,__LINE__, info->device_name);
|
|
|
|
mutex_lock(&info->port.mutex);
|
|
COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
|
|
mutex_unlock(&info->port.mutex);
|
|
if (err) {
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_get_params() */
|
|
|
|
/* mgsl_set_params()
|
|
*
|
|
* set the serial parameters
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* new_params user buffer containing new serial params
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
|
|
{
|
|
unsigned long flags;
|
|
MGSL_PARAMS tmp_params;
|
|
int err;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
|
|
info->device_name );
|
|
COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
|
|
if (err) {
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
return -EFAULT;
|
|
}
|
|
|
|
mutex_lock(&info->port.mutex);
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
mgsl_change_params(info);
|
|
mutex_unlock(&info->port.mutex);
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_set_params() */
|
|
|
|
/* mgsl_get_txidle()
|
|
*
|
|
* get the current transmit idle mode
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* idle_mode pointer to buffer to hold returned idle mode
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
|
|
{
|
|
int err;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
|
|
__FILE__,__LINE__, info->device_name, info->idle_mode);
|
|
|
|
COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
|
|
if (err) {
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_get_txidle() */
|
|
|
|
/* mgsl_set_txidle() service ioctl to set transmit idle mode
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* idle_mode new idle mode
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
|
|
info->device_name, idle_mode );
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
info->idle_mode = idle_mode;
|
|
usc_set_txidle( info );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return 0;
|
|
|
|
} /* end of mgsl_set_txidle() */
|
|
|
|
/* mgsl_txenable()
|
|
*
|
|
* enable or disable the transmitter
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* enable 1 = enable, 0 = disable
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_txenable(struct mgsl_struct * info, int enable)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
|
|
info->device_name, enable);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if ( enable ) {
|
|
if ( !info->tx_enabled ) {
|
|
|
|
usc_start_transmitter(info);
|
|
/*--------------------------------------------------
|
|
* if HDLC/SDLC Loop mode, attempt to insert the
|
|
* station in the 'loop' by setting CMR:13. Upon
|
|
* receipt of the next GoAhead (RxAbort) sequence,
|
|
* the OnLoop indicator (CCSR:7) should go active
|
|
* to indicate that we are on the loop
|
|
*--------------------------------------------------*/
|
|
if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
|
|
usc_loopmode_insert_request( info );
|
|
}
|
|
} else {
|
|
if ( info->tx_enabled )
|
|
usc_stop_transmitter(info);
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return 0;
|
|
|
|
} /* end of mgsl_txenable() */
|
|
|
|
/* mgsl_txabort() abort send HDLC frame
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_txabort(struct mgsl_struct * info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
|
|
info->device_name);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
|
|
{
|
|
if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
|
|
usc_loopmode_cancel_transmit( info );
|
|
else
|
|
usc_TCmd(info,TCmd_SendAbort);
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return 0;
|
|
|
|
} /* end of mgsl_txabort() */
|
|
|
|
/* mgsl_rxenable() enable or disable the receiver
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* enable 1 = enable, 0 = disable
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_rxenable(struct mgsl_struct * info, int enable)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
|
|
info->device_name, enable);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if ( enable ) {
|
|
if ( !info->rx_enabled )
|
|
usc_start_receiver(info);
|
|
} else {
|
|
if ( info->rx_enabled )
|
|
usc_stop_receiver(info);
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return 0;
|
|
|
|
} /* end of mgsl_rxenable() */
|
|
|
|
/* mgsl_wait_event() wait for specified event to occur
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* mask pointer to bitmask of events to wait for
|
|
* Return Value: 0 if successful and bit mask updated with
|
|
* of events triggerred,
|
|
* otherwise error code
|
|
*/
|
|
static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
|
|
{
|
|
unsigned long flags;
|
|
int s;
|
|
int rc=0;
|
|
struct mgsl_icount cprev, cnow;
|
|
int events;
|
|
int mask;
|
|
struct _input_signal_events oldsigs, newsigs;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
|
|
if (rc) {
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
|
|
info->device_name, mask);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
/* return immediately if state matches requested events */
|
|
usc_get_serial_signals(info);
|
|
s = info->serial_signals;
|
|
events = mask &
|
|
( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
|
|
((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
|
|
((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
|
|
((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
|
|
if (events) {
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
goto exit;
|
|
}
|
|
|
|
/* save current irq counts */
|
|
cprev = info->icount;
|
|
oldsigs = info->input_signal_events;
|
|
|
|
/* enable hunt and idle irqs if needed */
|
|
if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
|
|
u16 oldreg = usc_InReg(info,RICR);
|
|
u16 newreg = oldreg +
|
|
(mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
|
|
(mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
|
|
if (oldreg != newreg)
|
|
usc_OutReg(info, RICR, newreg);
|
|
}
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
add_wait_queue(&info->event_wait_q, &wait);
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
|
|
for(;;) {
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
rc = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
/* get current irq counts */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
cnow = info->icount;
|
|
newsigs = info->input_signal_events;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
/* if no change, wait aborted for some reason */
|
|
if (newsigs.dsr_up == oldsigs.dsr_up &&
|
|
newsigs.dsr_down == oldsigs.dsr_down &&
|
|
newsigs.dcd_up == oldsigs.dcd_up &&
|
|
newsigs.dcd_down == oldsigs.dcd_down &&
|
|
newsigs.cts_up == oldsigs.cts_up &&
|
|
newsigs.cts_down == oldsigs.cts_down &&
|
|
newsigs.ri_up == oldsigs.ri_up &&
|
|
newsigs.ri_down == oldsigs.ri_down &&
|
|
cnow.exithunt == cprev.exithunt &&
|
|
cnow.rxidle == cprev.rxidle) {
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
|
|
events = mask &
|
|
( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
|
|
(newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
|
|
(newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
|
|
(newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
|
|
(newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
|
|
(newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
|
|
(newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
|
|
(newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
|
|
(cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
|
|
(cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
|
|
if (events)
|
|
break;
|
|
|
|
cprev = cnow;
|
|
oldsigs = newsigs;
|
|
}
|
|
|
|
remove_wait_queue(&info->event_wait_q, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (!waitqueue_active(&info->event_wait_q)) {
|
|
/* disable enable exit hunt mode/idle rcvd IRQs */
|
|
usc_OutReg(info, RICR, usc_InReg(info,RICR) &
|
|
~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
exit:
|
|
if ( rc == 0 )
|
|
PUT_USER(rc, events, mask_ptr);
|
|
|
|
return rc;
|
|
|
|
} /* end of mgsl_wait_event() */
|
|
|
|
static int modem_input_wait(struct mgsl_struct *info,int arg)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
struct mgsl_icount cprev, cnow;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
/* save current irq counts */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
cprev = info->icount;
|
|
add_wait_queue(&info->status_event_wait_q, &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
for(;;) {
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
rc = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
/* get new irq counts */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
cnow = info->icount;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
/* if no change, wait aborted for some reason */
|
|
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
|
|
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* check for change in caller specified modem input */
|
|
if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
|
|
(arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
|
|
(arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
|
|
(arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
cprev = cnow;
|
|
}
|
|
remove_wait_queue(&info->status_event_wait_q, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
return rc;
|
|
}
|
|
|
|
/* return the state of the serial control and status signals
|
|
*/
|
|
static int tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_get_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
|
|
((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
|
|
((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
|
|
((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
|
|
((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
|
|
((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):%s tiocmget() value=%08X\n",
|
|
__FILE__,__LINE__, info->device_name, result );
|
|
return result;
|
|
}
|
|
|
|
/* set modem control signals (DTR/RTS)
|
|
*/
|
|
static int tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):%s tiocmset(%x,%x)\n",
|
|
__FILE__,__LINE__,info->device_name, set, clear);
|
|
|
|
if (set & TIOCM_RTS)
|
|
info->serial_signals |= SerialSignal_RTS;
|
|
if (set & TIOCM_DTR)
|
|
info->serial_signals |= SerialSignal_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
info->serial_signals &= ~SerialSignal_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
info->serial_signals &= ~SerialSignal_DTR;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* mgsl_break() Set or clear transmit break condition
|
|
*
|
|
* Arguments: tty pointer to tty instance data
|
|
* break_state -1=set break condition, 0=clear
|
|
* Return Value: error code
|
|
*/
|
|
static int mgsl_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_break(%s,%d)\n",
|
|
__FILE__,__LINE__, info->device_name, break_state);
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (break_state == -1)
|
|
usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
|
|
else
|
|
usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
return 0;
|
|
|
|
} /* end of mgsl_break() */
|
|
|
|
/*
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
|
* Return: write counters to the user passed counter struct
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
|
* RI where only 0->1 is counted.
|
|
*/
|
|
static int msgl_get_icount(struct tty_struct *tty,
|
|
struct serial_icounter_struct *icount)
|
|
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
struct mgsl_icount cnow; /* kernel counter temps */
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
cnow = info->icount;
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
icount->cts = cnow.cts;
|
|
icount->dsr = cnow.dsr;
|
|
icount->rng = cnow.rng;
|
|
icount->dcd = cnow.dcd;
|
|
icount->rx = cnow.rx;
|
|
icount->tx = cnow.tx;
|
|
icount->frame = cnow.frame;
|
|
icount->overrun = cnow.overrun;
|
|
icount->parity = cnow.parity;
|
|
icount->brk = cnow.brk;
|
|
icount->buf_overrun = cnow.buf_overrun;
|
|
return 0;
|
|
}
|
|
|
|
/* mgsl_ioctl() Service an IOCTL request
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty instance data
|
|
* cmd IOCTL command code
|
|
* arg command argument/context
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
|
|
info->device_name, cmd );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCMIWAIT)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
return mgsl_ioctl_common(info, cmd, arg);
|
|
}
|
|
|
|
static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case MGSL_IOCGPARAMS:
|
|
return mgsl_get_params(info, argp);
|
|
case MGSL_IOCSPARAMS:
|
|
return mgsl_set_params(info, argp);
|
|
case MGSL_IOCGTXIDLE:
|
|
return mgsl_get_txidle(info, argp);
|
|
case MGSL_IOCSTXIDLE:
|
|
return mgsl_set_txidle(info,(int)arg);
|
|
case MGSL_IOCTXENABLE:
|
|
return mgsl_txenable(info,(int)arg);
|
|
case MGSL_IOCRXENABLE:
|
|
return mgsl_rxenable(info,(int)arg);
|
|
case MGSL_IOCTXABORT:
|
|
return mgsl_txabort(info);
|
|
case MGSL_IOCGSTATS:
|
|
return mgsl_get_stats(info, argp);
|
|
case MGSL_IOCWAITEVENT:
|
|
return mgsl_wait_event(info, argp);
|
|
case MGSL_IOCLOOPTXDONE:
|
|
return mgsl_loopmode_send_done(info);
|
|
/* Wait for modem input (DCD,RI,DSR,CTS) change
|
|
* as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
|
|
*/
|
|
case TIOCMIWAIT:
|
|
return modem_input_wait(info,(int)arg);
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* mgsl_set_termios()
|
|
*
|
|
* Set new termios settings
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty structure
|
|
* termios pointer to buffer to hold returned old termios
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
|
|
tty->driver->name );
|
|
|
|
mgsl_change_params(info);
|
|
|
|
/* Handle transition to B0 status */
|
|
if (old_termios->c_cflag & CBAUD &&
|
|
!(tty->termios.c_cflag & CBAUD)) {
|
|
info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
|
tty->termios.c_cflag & CBAUD) {
|
|
info->serial_signals |= SerialSignal_DTR;
|
|
if (!(tty->termios.c_cflag & CRTSCTS) ||
|
|
!test_bit(TTY_THROTTLED, &tty->flags)) {
|
|
info->serial_signals |= SerialSignal_RTS;
|
|
}
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if (old_termios->c_cflag & CRTSCTS &&
|
|
!(tty->termios.c_cflag & CRTSCTS)) {
|
|
tty->hw_stopped = 0;
|
|
mgsl_start(tty);
|
|
}
|
|
|
|
} /* end of mgsl_set_termios() */
|
|
|
|
/* mgsl_close()
|
|
*
|
|
* Called when port is closed. Wait for remaining data to be
|
|
* sent. Disable port and free resources.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to open tty structure
|
|
* filp pointer to open file object
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
|
|
return;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
|
|
__FILE__,__LINE__, info->device_name, info->port.count);
|
|
|
|
if (tty_port_close_start(&info->port, tty, filp) == 0)
|
|
goto cleanup;
|
|
|
|
mutex_lock(&info->port.mutex);
|
|
if (info->port.flags & ASYNC_INITIALIZED)
|
|
mgsl_wait_until_sent(tty, info->timeout);
|
|
mgsl_flush_buffer(tty);
|
|
tty_ldisc_flush(tty);
|
|
shutdown(info);
|
|
mutex_unlock(&info->port.mutex);
|
|
|
|
tty_port_close_end(&info->port, tty);
|
|
info->port.tty = NULL;
|
|
cleanup:
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
|
|
tty->driver->name, info->port.count);
|
|
|
|
} /* end of mgsl_close() */
|
|
|
|
/* mgsl_wait_until_sent()
|
|
*
|
|
* Wait until the transmitter is empty.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty info structure
|
|
* timeout time to wait for send completion
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
|
|
if (!info )
|
|
return;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
|
|
return;
|
|
|
|
if (!(info->port.flags & ASYNC_INITIALIZED))
|
|
goto exit;
|
|
|
|
orig_jiffies = jiffies;
|
|
|
|
/* Set check interval to 1/5 of estimated time to
|
|
* send a character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
* Note: use tight timings here to satisfy the NIST-PCTS.
|
|
*/
|
|
|
|
if ( info->params.data_rate ) {
|
|
char_time = info->timeout/(32 * 5);
|
|
if (!char_time)
|
|
char_time++;
|
|
} else
|
|
char_time = 1;
|
|
|
|
if (timeout)
|
|
char_time = min_t(unsigned long, char_time, timeout);
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
while (info->tx_active) {
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
break;
|
|
}
|
|
} else {
|
|
while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
|
|
info->tx_enabled) {
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
break;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
} /* end of mgsl_wait_until_sent() */
|
|
|
|
/* mgsl_hangup()
|
|
*
|
|
* Called by tty_hangup() when a hangup is signaled.
|
|
* This is the same as to closing all open files for the port.
|
|
*
|
|
* Arguments: tty pointer to associated tty object
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_hangup(struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct * info = tty->driver_data;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_hangup(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
|
|
return;
|
|
|
|
mgsl_flush_buffer(tty);
|
|
shutdown(info);
|
|
|
|
info->port.count = 0;
|
|
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
info->port.tty = NULL;
|
|
|
|
wake_up_interruptible(&info->port.open_wait);
|
|
|
|
} /* end of mgsl_hangup() */
|
|
|
|
/*
|
|
* carrier_raised()
|
|
*
|
|
* Return true if carrier is raised
|
|
*/
|
|
|
|
static int carrier_raised(struct tty_port *port)
|
|
{
|
|
unsigned long flags;
|
|
struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock, flags);
|
|
usc_get_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock, flags);
|
|
return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
|
|
}
|
|
|
|
static void dtr_rts(struct tty_port *port, int on)
|
|
{
|
|
struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (on)
|
|
info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
|
|
else
|
|
info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
|
|
usc_set_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
|
|
/* block_til_ready()
|
|
*
|
|
* Block the current process until the specified port
|
|
* is ready to be opened.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty info structure
|
|
* filp pointer to open file object
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
|
struct mgsl_struct *info)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int retval;
|
|
bool do_clocal = false;
|
|
bool extra_count = false;
|
|
unsigned long flags;
|
|
int dcd;
|
|
struct tty_port *port = &info->port;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):block_til_ready on %s\n",
|
|
__FILE__,__LINE__, tty->driver->name );
|
|
|
|
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
|
|
/* nonblock mode is set or port is not enabled */
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (tty->termios.c_cflag & CLOCAL)
|
|
do_clocal = true;
|
|
|
|
/* Wait for carrier detect and the line to become
|
|
* free (i.e., not in use by the callout). While we are in
|
|
* this loop, port->count is dropped by one, so that
|
|
* mgsl_close() knows when to free things. We restore it upon
|
|
* exit, either normal or abnormal.
|
|
*/
|
|
|
|
retval = 0;
|
|
add_wait_queue(&port->open_wait, &wait);
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):block_til_ready before block on %s count=%d\n",
|
|
__FILE__,__LINE__, tty->driver->name, port->count );
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock, flags);
|
|
if (!tty_hung_up_p(filp)) {
|
|
extra_count = true;
|
|
port->count--;
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock, flags);
|
|
port->blocked_open++;
|
|
|
|
while (1) {
|
|
if (tty->termios.c_cflag & CBAUD)
|
|
tty_port_raise_dtr_rts(port);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
|
|
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
|
|
-EAGAIN : -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
dcd = tty_port_carrier_raised(&info->port);
|
|
|
|
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
|
|
break;
|
|
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
|
|
__FILE__,__LINE__, tty->driver->name, port->count );
|
|
|
|
tty_unlock(tty);
|
|
schedule();
|
|
tty_lock(tty);
|
|
}
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&port->open_wait, &wait);
|
|
|
|
/* FIXME: Racy on hangup during close wait */
|
|
if (extra_count)
|
|
port->count++;
|
|
port->blocked_open--;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
|
|
__FILE__,__LINE__, tty->driver->name, port->count );
|
|
|
|
if (!retval)
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
|
|
return retval;
|
|
|
|
} /* end of block_til_ready() */
|
|
|
|
static int mgsl_install(struct tty_driver *driver, struct tty_struct *tty)
|
|
{
|
|
struct mgsl_struct *info;
|
|
int line = tty->index;
|
|
|
|
/* verify range of specified line number */
|
|
if (line >= mgsl_device_count) {
|
|
printk("%s(%d):mgsl_open with invalid line #%d.\n",
|
|
__FILE__, __LINE__, line);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* find the info structure for the specified line */
|
|
info = mgsl_device_list;
|
|
while (info && info->line != line)
|
|
info = info->next_device;
|
|
if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
|
|
return -ENODEV;
|
|
tty->driver_data = info;
|
|
|
|
return tty_port_install(&info->port, driver, tty);
|
|
}
|
|
|
|
/* mgsl_open()
|
|
*
|
|
* Called when a port is opened. Init and enable port.
|
|
* Perform serial-specific initialization for the tty structure.
|
|
*
|
|
* Arguments: tty pointer to tty info structure
|
|
* filp associated file pointer
|
|
*
|
|
* Return Value: 0 if success, otherwise error code
|
|
*/
|
|
static int mgsl_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct mgsl_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
info->port.tty = tty;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
|
|
__FILE__,__LINE__,tty->driver->name, info->port.count);
|
|
|
|
/* If port is closing, signal caller to try again */
|
|
if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
|
|
if (info->port.flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&info->port.close_wait);
|
|
retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
|
|
-EAGAIN : -ERESTARTSYS);
|
|
goto cleanup;
|
|
}
|
|
|
|
info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
spin_lock_irqsave(&info->netlock, flags);
|
|
if (info->netcount) {
|
|
retval = -EBUSY;
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
goto cleanup;
|
|
}
|
|
info->port.count++;
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
|
|
if (info->port.count == 1) {
|
|
/* 1st open on this device, init hardware */
|
|
retval = startup(info);
|
|
if (retval < 0)
|
|
goto cleanup;
|
|
}
|
|
|
|
retval = block_til_ready(tty, filp, info);
|
|
if (retval) {
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):block_til_ready(%s) returned %d\n",
|
|
__FILE__,__LINE__, info->device_name, retval);
|
|
goto cleanup;
|
|
}
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s(%d):mgsl_open(%s) success\n",
|
|
__FILE__,__LINE__, info->device_name);
|
|
retval = 0;
|
|
|
|
cleanup:
|
|
if (retval) {
|
|
if (tty->count == 1)
|
|
info->port.tty = NULL; /* tty layer will release tty struct */
|
|
if(info->port.count)
|
|
info->port.count--;
|
|
}
|
|
|
|
return retval;
|
|
|
|
} /* end of mgsl_open() */
|
|
|
|
/*
|
|
* /proc fs routines....
|
|
*/
|
|
|
|
static inline void line_info(struct seq_file *m, struct mgsl_struct *info)
|
|
{
|
|
char stat_buf[30];
|
|
unsigned long flags;
|
|
|
|
if (info->bus_type == MGSL_BUS_TYPE_PCI) {
|
|
seq_printf(m, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
|
|
info->device_name, info->io_base, info->irq_level,
|
|
info->phys_memory_base, info->phys_lcr_base);
|
|
} else {
|
|
seq_printf(m, "%s:(E)ISA io:%04X irq:%d dma:%d",
|
|
info->device_name, info->io_base,
|
|
info->irq_level, info->dma_level);
|
|
}
|
|
|
|
/* output current serial signal states */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_get_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
stat_buf[0] = 0;
|
|
stat_buf[1] = 0;
|
|
if (info->serial_signals & SerialSignal_RTS)
|
|
strcat(stat_buf, "|RTS");
|
|
if (info->serial_signals & SerialSignal_CTS)
|
|
strcat(stat_buf, "|CTS");
|
|
if (info->serial_signals & SerialSignal_DTR)
|
|
strcat(stat_buf, "|DTR");
|
|
if (info->serial_signals & SerialSignal_DSR)
|
|
strcat(stat_buf, "|DSR");
|
|
if (info->serial_signals & SerialSignal_DCD)
|
|
strcat(stat_buf, "|CD");
|
|
if (info->serial_signals & SerialSignal_RI)
|
|
strcat(stat_buf, "|RI");
|
|
|
|
if (info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
seq_printf(m, " HDLC txok:%d rxok:%d",
|
|
info->icount.txok, info->icount.rxok);
|
|
if (info->icount.txunder)
|
|
seq_printf(m, " txunder:%d", info->icount.txunder);
|
|
if (info->icount.txabort)
|
|
seq_printf(m, " txabort:%d", info->icount.txabort);
|
|
if (info->icount.rxshort)
|
|
seq_printf(m, " rxshort:%d", info->icount.rxshort);
|
|
if (info->icount.rxlong)
|
|
seq_printf(m, " rxlong:%d", info->icount.rxlong);
|
|
if (info->icount.rxover)
|
|
seq_printf(m, " rxover:%d", info->icount.rxover);
|
|
if (info->icount.rxcrc)
|
|
seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
|
|
} else {
|
|
seq_printf(m, " ASYNC tx:%d rx:%d",
|
|
info->icount.tx, info->icount.rx);
|
|
if (info->icount.frame)
|
|
seq_printf(m, " fe:%d", info->icount.frame);
|
|
if (info->icount.parity)
|
|
seq_printf(m, " pe:%d", info->icount.parity);
|
|
if (info->icount.brk)
|
|
seq_printf(m, " brk:%d", info->icount.brk);
|
|
if (info->icount.overrun)
|
|
seq_printf(m, " oe:%d", info->icount.overrun);
|
|
}
|
|
|
|
/* Append serial signal status to end */
|
|
seq_printf(m, " %s\n", stat_buf+1);
|
|
|
|
seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
|
|
info->tx_active,info->bh_requested,info->bh_running,
|
|
info->pending_bh);
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
{
|
|
u16 Tcsr = usc_InReg( info, TCSR );
|
|
u16 Tdmr = usc_InDmaReg( info, TDMR );
|
|
u16 Ticr = usc_InReg( info, TICR );
|
|
u16 Rscr = usc_InReg( info, RCSR );
|
|
u16 Rdmr = usc_InDmaReg( info, RDMR );
|
|
u16 Ricr = usc_InReg( info, RICR );
|
|
u16 Icr = usc_InReg( info, ICR );
|
|
u16 Dccr = usc_InReg( info, DCCR );
|
|
u16 Tmr = usc_InReg( info, TMR );
|
|
u16 Tccr = usc_InReg( info, TCCR );
|
|
u16 Ccar = inw( info->io_base + CCAR );
|
|
seq_printf(m, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
|
|
"ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
|
|
Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
|
|
/* Called to print information about devices */
|
|
static int mgsl_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct mgsl_struct *info;
|
|
|
|
seq_printf(m, "synclink driver:%s\n", driver_version);
|
|
|
|
info = mgsl_device_list;
|
|
while( info ) {
|
|
line_info(m, info);
|
|
info = info->next_device;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mgsl_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, mgsl_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations mgsl_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = mgsl_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
/* mgsl_allocate_dma_buffers()
|
|
*
|
|
* Allocate and format DMA buffers (ISA adapter)
|
|
* or format shared memory buffers (PCI adapter).
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: 0 if success, otherwise error
|
|
*/
|
|
static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
|
|
{
|
|
unsigned short BuffersPerFrame;
|
|
|
|
info->last_mem_alloc = 0;
|
|
|
|
/* Calculate the number of DMA buffers necessary to hold the */
|
|
/* largest allowable frame size. Note: If the max frame size is */
|
|
/* not an even multiple of the DMA buffer size then we need to */
|
|
/* round the buffer count per frame up one. */
|
|
|
|
BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
|
|
if ( info->max_frame_size % DMABUFFERSIZE )
|
|
BuffersPerFrame++;
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
/*
|
|
* The PCI adapter has 256KBytes of shared memory to use.
|
|
* This is 64 PAGE_SIZE buffers.
|
|
*
|
|
* The first page is used for padding at this time so the
|
|
* buffer list does not begin at offset 0 of the PCI
|
|
* adapter's shared memory.
|
|
*
|
|
* The 2nd page is used for the buffer list. A 4K buffer
|
|
* list can hold 128 DMA_BUFFER structures at 32 bytes
|
|
* each.
|
|
*
|
|
* This leaves 62 4K pages.
|
|
*
|
|
* The next N pages are used for transmit frame(s). We
|
|
* reserve enough 4K page blocks to hold the required
|
|
* number of transmit dma buffers (num_tx_dma_buffers),
|
|
* each of MaxFrameSize size.
|
|
*
|
|
* Of the remaining pages (62-N), determine how many can
|
|
* be used to receive full MaxFrameSize inbound frames
|
|
*/
|
|
info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
|
|
info->rx_buffer_count = 62 - info->tx_buffer_count;
|
|
} else {
|
|
/* Calculate the number of PAGE_SIZE buffers needed for */
|
|
/* receive and transmit DMA buffers. */
|
|
|
|
|
|
/* Calculate the number of DMA buffers necessary to */
|
|
/* hold 7 max size receive frames and one max size transmit frame. */
|
|
/* The receive buffer count is bumped by one so we avoid an */
|
|
/* End of List condition if all receive buffers are used when */
|
|
/* using linked list DMA buffers. */
|
|
|
|
info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
|
|
info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
|
|
|
|
/*
|
|
* limit total TxBuffers & RxBuffers to 62 4K total
|
|
* (ala PCI Allocation)
|
|
*/
|
|
|
|
if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
|
|
info->rx_buffer_count = 62 - info->tx_buffer_count;
|
|
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
|
|
__FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
|
|
|
|
if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
|
|
mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
|
|
mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
|
|
mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
|
|
mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
|
|
printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mgsl_reset_rx_dma_buffers( info );
|
|
mgsl_reset_tx_dma_buffers( info );
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_allocate_dma_buffers() */
|
|
|
|
/*
|
|
* mgsl_alloc_buffer_list_memory()
|
|
*
|
|
* Allocate a common DMA buffer for use as the
|
|
* receive and transmit buffer lists.
|
|
*
|
|
* A buffer list is a set of buffer entries where each entry contains
|
|
* a pointer to an actual buffer and a pointer to the next buffer entry
|
|
* (plus some other info about the buffer).
|
|
*
|
|
* The buffer entries for a list are built to form a circular list so
|
|
* that when the entire list has been traversed you start back at the
|
|
* beginning.
|
|
*
|
|
* This function allocates memory for just the buffer entries.
|
|
* The links (pointer to next entry) are filled in with the physical
|
|
* address of the next entry so the adapter can navigate the list
|
|
* using bus master DMA. The pointers to the actual buffers are filled
|
|
* out later when the actual buffers are allocated.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: 0 if success, otherwise error
|
|
*/
|
|
static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
|
|
{
|
|
unsigned int i;
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
/* PCI adapter uses shared memory. */
|
|
info->buffer_list = info->memory_base + info->last_mem_alloc;
|
|
info->buffer_list_phys = info->last_mem_alloc;
|
|
info->last_mem_alloc += BUFFERLISTSIZE;
|
|
} else {
|
|
/* ISA adapter uses system memory. */
|
|
/* The buffer lists are allocated as a common buffer that both */
|
|
/* the processor and adapter can access. This allows the driver to */
|
|
/* inspect portions of the buffer while other portions are being */
|
|
/* updated by the adapter using Bus Master DMA. */
|
|
|
|
info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
|
|
if (info->buffer_list == NULL)
|
|
return -ENOMEM;
|
|
info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
|
|
}
|
|
|
|
/* We got the memory for the buffer entry lists. */
|
|
/* Initialize the memory block to all zeros. */
|
|
memset( info->buffer_list, 0, BUFFERLISTSIZE );
|
|
|
|
/* Save virtual address pointers to the receive and */
|
|
/* transmit buffer lists. (Receive 1st). These pointers will */
|
|
/* be used by the processor to access the lists. */
|
|
info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
|
|
info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
|
|
info->tx_buffer_list += info->rx_buffer_count;
|
|
|
|
/*
|
|
* Build the links for the buffer entry lists such that
|
|
* two circular lists are built. (Transmit and Receive).
|
|
*
|
|
* Note: the links are physical addresses
|
|
* which are read by the adapter to determine the next
|
|
* buffer entry to use.
|
|
*/
|
|
|
|
for ( i = 0; i < info->rx_buffer_count; i++ ) {
|
|
/* calculate and store physical address of this buffer entry */
|
|
info->rx_buffer_list[i].phys_entry =
|
|
info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
|
|
|
|
/* calculate and store physical address of */
|
|
/* next entry in cirular list of entries */
|
|
|
|
info->rx_buffer_list[i].link = info->buffer_list_phys;
|
|
|
|
if ( i < info->rx_buffer_count - 1 )
|
|
info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
|
|
}
|
|
|
|
for ( i = 0; i < info->tx_buffer_count; i++ ) {
|
|
/* calculate and store physical address of this buffer entry */
|
|
info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
|
|
((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
|
|
|
|
/* calculate and store physical address of */
|
|
/* next entry in cirular list of entries */
|
|
|
|
info->tx_buffer_list[i].link = info->buffer_list_phys +
|
|
info->rx_buffer_count * sizeof(DMABUFFERENTRY);
|
|
|
|
if ( i < info->tx_buffer_count - 1 )
|
|
info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_alloc_buffer_list_memory() */
|
|
|
|
/* Free DMA buffers allocated for use as the
|
|
* receive and transmit buffer lists.
|
|
* Warning:
|
|
*
|
|
* The data transfer buffers associated with the buffer list
|
|
* MUST be freed before freeing the buffer list itself because
|
|
* the buffer list contains the information necessary to free
|
|
* the individual buffers!
|
|
*/
|
|
static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
|
|
{
|
|
if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
|
|
dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
|
|
|
|
info->buffer_list = NULL;
|
|
info->rx_buffer_list = NULL;
|
|
info->tx_buffer_list = NULL;
|
|
|
|
} /* end of mgsl_free_buffer_list_memory() */
|
|
|
|
/*
|
|
* mgsl_alloc_frame_memory()
|
|
*
|
|
* Allocate the frame DMA buffers used by the specified buffer list.
|
|
* Each DMA buffer will be one memory page in size. This is necessary
|
|
* because memory can fragment enough that it may be impossible
|
|
* contiguous pages.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* BufferList pointer to list of buffer entries
|
|
* Buffercount count of buffer entries in buffer list
|
|
*
|
|
* Return Value: 0 if success, otherwise -ENOMEM
|
|
*/
|
|
static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
|
|
{
|
|
int i;
|
|
u32 phys_addr;
|
|
|
|
/* Allocate page sized buffers for the receive buffer list */
|
|
|
|
for ( i = 0; i < Buffercount; i++ ) {
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
/* PCI adapter uses shared memory buffers. */
|
|
BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
|
|
phys_addr = info->last_mem_alloc;
|
|
info->last_mem_alloc += DMABUFFERSIZE;
|
|
} else {
|
|
/* ISA adapter uses system memory. */
|
|
BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
|
|
if (BufferList[i].virt_addr == NULL)
|
|
return -ENOMEM;
|
|
phys_addr = (u32)(BufferList[i].dma_addr);
|
|
}
|
|
BufferList[i].phys_addr = phys_addr;
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_alloc_frame_memory() */
|
|
|
|
/*
|
|
* mgsl_free_frame_memory()
|
|
*
|
|
* Free the buffers associated with
|
|
* each buffer entry of a buffer list.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* BufferList pointer to list of buffer entries
|
|
* Buffercount count of buffer entries in buffer list
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
|
|
{
|
|
int i;
|
|
|
|
if ( BufferList ) {
|
|
for ( i = 0 ; i < Buffercount ; i++ ) {
|
|
if ( BufferList[i].virt_addr ) {
|
|
if ( info->bus_type != MGSL_BUS_TYPE_PCI )
|
|
dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
|
|
BufferList[i].virt_addr = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
} /* end of mgsl_free_frame_memory() */
|
|
|
|
/* mgsl_free_dma_buffers()
|
|
*
|
|
* Free DMA buffers
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_free_dma_buffers( struct mgsl_struct *info )
|
|
{
|
|
mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
|
|
mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
|
|
mgsl_free_buffer_list_memory( info );
|
|
|
|
} /* end of mgsl_free_dma_buffers() */
|
|
|
|
|
|
/*
|
|
* mgsl_alloc_intermediate_rxbuffer_memory()
|
|
*
|
|
* Allocate a buffer large enough to hold max_frame_size. This buffer
|
|
* is used to pass an assembled frame to the line discipline.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: 0 if success, otherwise -ENOMEM
|
|
*/
|
|
static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
|
|
{
|
|
info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
|
|
if ( info->intermediate_rxbuffer == NULL )
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
|
|
|
|
/*
|
|
* mgsl_free_intermediate_rxbuffer_memory()
|
|
*
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
|
|
{
|
|
kfree(info->intermediate_rxbuffer);
|
|
info->intermediate_rxbuffer = NULL;
|
|
|
|
} /* end of mgsl_free_intermediate_rxbuffer_memory() */
|
|
|
|
/*
|
|
* mgsl_alloc_intermediate_txbuffer_memory()
|
|
*
|
|
* Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
|
|
* This buffer is used to load transmit frames into the adapter's dma transfer
|
|
* buffers when there is sufficient space.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: 0 if success, otherwise -ENOMEM
|
|
*/
|
|
static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
|
|
{
|
|
int i;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("%s %s(%d) allocating %d tx holding buffers\n",
|
|
info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
|
|
|
|
memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
|
|
|
|
for ( i=0; i<info->num_tx_holding_buffers; ++i) {
|
|
info->tx_holding_buffers[i].buffer =
|
|
kmalloc(info->max_frame_size, GFP_KERNEL);
|
|
if (info->tx_holding_buffers[i].buffer == NULL) {
|
|
for (--i; i >= 0; i--) {
|
|
kfree(info->tx_holding_buffers[i].buffer);
|
|
info->tx_holding_buffers[i].buffer = NULL;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_alloc_intermediate_txbuffer_memory() */
|
|
|
|
/*
|
|
* mgsl_free_intermediate_txbuffer_memory()
|
|
*
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
|
|
{
|
|
int i;
|
|
|
|
for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
|
|
kfree(info->tx_holding_buffers[i].buffer);
|
|
info->tx_holding_buffers[i].buffer = NULL;
|
|
}
|
|
|
|
info->get_tx_holding_index = 0;
|
|
info->put_tx_holding_index = 0;
|
|
info->tx_holding_count = 0;
|
|
|
|
} /* end of mgsl_free_intermediate_txbuffer_memory() */
|
|
|
|
|
|
/*
|
|
* load_next_tx_holding_buffer()
|
|
*
|
|
* attempts to load the next buffered tx request into the
|
|
* tx dma buffers
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
*
|
|
* Return Value: true if next buffered tx request loaded
|
|
* into adapter's tx dma buffer,
|
|
* false otherwise
|
|
*/
|
|
static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
|
|
{
|
|
bool ret = false;
|
|
|
|
if ( info->tx_holding_count ) {
|
|
/* determine if we have enough tx dma buffers
|
|
* to accommodate the next tx frame
|
|
*/
|
|
struct tx_holding_buffer *ptx =
|
|
&info->tx_holding_buffers[info->get_tx_holding_index];
|
|
int num_free = num_free_tx_dma_buffers(info);
|
|
int num_needed = ptx->buffer_size / DMABUFFERSIZE;
|
|
if ( ptx->buffer_size % DMABUFFERSIZE )
|
|
++num_needed;
|
|
|
|
if (num_needed <= num_free) {
|
|
info->xmit_cnt = ptx->buffer_size;
|
|
mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
|
|
|
|
--info->tx_holding_count;
|
|
if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
|
|
info->get_tx_holding_index=0;
|
|
|
|
/* restart transmit timer */
|
|
mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
|
|
|
|
ret = true;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* save_tx_buffer_request()
|
|
*
|
|
* attempt to store transmit frame request for later transmission
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* Buffer pointer to buffer containing frame to load
|
|
* BufferSize size in bytes of frame in Buffer
|
|
*
|
|
* Return Value: 1 if able to store, 0 otherwise
|
|
*/
|
|
static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
|
|
{
|
|
struct tx_holding_buffer *ptx;
|
|
|
|
if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
|
|
return 0; /* all buffers in use */
|
|
}
|
|
|
|
ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
|
|
ptx->buffer_size = BufferSize;
|
|
memcpy( ptx->buffer, Buffer, BufferSize);
|
|
|
|
++info->tx_holding_count;
|
|
if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
|
|
info->put_tx_holding_index=0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mgsl_claim_resources(struct mgsl_struct *info)
|
|
{
|
|
if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
|
|
printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->io_base);
|
|
return -ENODEV;
|
|
}
|
|
info->io_addr_requested = true;
|
|
|
|
if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
|
|
info->device_name, info ) < 0 ) {
|
|
printk( "%s(%d):Can't request interrupt on device %s IRQ=%d\n",
|
|
__FILE__,__LINE__,info->device_name, info->irq_level );
|
|
goto errout;
|
|
}
|
|
info->irq_requested = true;
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
|
|
printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->phys_memory_base);
|
|
goto errout;
|
|
}
|
|
info->shared_mem_requested = true;
|
|
if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
|
|
printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
|
|
goto errout;
|
|
}
|
|
info->lcr_mem_requested = true;
|
|
|
|
info->memory_base = ioremap_nocache(info->phys_memory_base,
|
|
0x40000);
|
|
if (!info->memory_base) {
|
|
printk( "%s(%d):Can't map shared memory on device %s MemAddr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->phys_memory_base );
|
|
goto errout;
|
|
}
|
|
|
|
if ( !mgsl_memory_test(info) ) {
|
|
printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->phys_memory_base );
|
|
goto errout;
|
|
}
|
|
|
|
info->lcr_base = ioremap_nocache(info->phys_lcr_base,
|
|
PAGE_SIZE);
|
|
if (!info->lcr_base) {
|
|
printk( "%s(%d):Can't map LCR memory on device %s MemAddr=%08X\n",
|
|
__FILE__,__LINE__,info->device_name, info->phys_lcr_base );
|
|
goto errout;
|
|
}
|
|
info->lcr_base += info->lcr_offset;
|
|
|
|
} else {
|
|
/* claim DMA channel */
|
|
|
|
if (request_dma(info->dma_level,info->device_name) < 0){
|
|
printk( "%s(%d):Can't request DMA channel on device %s DMA=%d\n",
|
|
__FILE__,__LINE__,info->device_name, info->dma_level );
|
|
mgsl_release_resources( info );
|
|
return -ENODEV;
|
|
}
|
|
info->dma_requested = true;
|
|
|
|
/* ISA adapter uses bus master DMA */
|
|
set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
|
|
enable_dma(info->dma_level);
|
|
}
|
|
|
|
if ( mgsl_allocate_dma_buffers(info) < 0 ) {
|
|
printk( "%s(%d):Can't allocate DMA buffers on device %s DMA=%d\n",
|
|
__FILE__,__LINE__,info->device_name, info->dma_level );
|
|
goto errout;
|
|
}
|
|
|
|
return 0;
|
|
errout:
|
|
mgsl_release_resources(info);
|
|
return -ENODEV;
|
|
|
|
} /* end of mgsl_claim_resources() */
|
|
|
|
static void mgsl_release_resources(struct mgsl_struct *info)
|
|
{
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_release_resources(%s) entry\n",
|
|
__FILE__,__LINE__,info->device_name );
|
|
|
|
if ( info->irq_requested ) {
|
|
free_irq(info->irq_level, info);
|
|
info->irq_requested = false;
|
|
}
|
|
if ( info->dma_requested ) {
|
|
disable_dma(info->dma_level);
|
|
free_dma(info->dma_level);
|
|
info->dma_requested = false;
|
|
}
|
|
mgsl_free_dma_buffers(info);
|
|
mgsl_free_intermediate_rxbuffer_memory(info);
|
|
mgsl_free_intermediate_txbuffer_memory(info);
|
|
|
|
if ( info->io_addr_requested ) {
|
|
release_region(info->io_base,info->io_addr_size);
|
|
info->io_addr_requested = false;
|
|
}
|
|
if ( info->shared_mem_requested ) {
|
|
release_mem_region(info->phys_memory_base,0x40000);
|
|
info->shared_mem_requested = false;
|
|
}
|
|
if ( info->lcr_mem_requested ) {
|
|
release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
|
|
info->lcr_mem_requested = false;
|
|
}
|
|
if (info->memory_base){
|
|
iounmap(info->memory_base);
|
|
info->memory_base = NULL;
|
|
}
|
|
if (info->lcr_base){
|
|
iounmap(info->lcr_base - info->lcr_offset);
|
|
info->lcr_base = NULL;
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_release_resources(%s) exit\n",
|
|
__FILE__,__LINE__,info->device_name );
|
|
|
|
} /* end of mgsl_release_resources() */
|
|
|
|
/* mgsl_add_device()
|
|
*
|
|
* Add the specified device instance data structure to the
|
|
* global linked list of devices and increment the device count.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_add_device( struct mgsl_struct *info )
|
|
{
|
|
info->next_device = NULL;
|
|
info->line = mgsl_device_count;
|
|
sprintf(info->device_name,"ttySL%d",info->line);
|
|
|
|
if (info->line < MAX_TOTAL_DEVICES) {
|
|
if (maxframe[info->line])
|
|
info->max_frame_size = maxframe[info->line];
|
|
|
|
if (txdmabufs[info->line]) {
|
|
info->num_tx_dma_buffers = txdmabufs[info->line];
|
|
if (info->num_tx_dma_buffers < 1)
|
|
info->num_tx_dma_buffers = 1;
|
|
}
|
|
|
|
if (txholdbufs[info->line]) {
|
|
info->num_tx_holding_buffers = txholdbufs[info->line];
|
|
if (info->num_tx_holding_buffers < 1)
|
|
info->num_tx_holding_buffers = 1;
|
|
else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
|
|
info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
|
|
}
|
|
}
|
|
|
|
mgsl_device_count++;
|
|
|
|
if ( !mgsl_device_list )
|
|
mgsl_device_list = info;
|
|
else {
|
|
struct mgsl_struct *current_dev = mgsl_device_list;
|
|
while( current_dev->next_device )
|
|
current_dev = current_dev->next_device;
|
|
current_dev->next_device = info;
|
|
}
|
|
|
|
if ( info->max_frame_size < 4096 )
|
|
info->max_frame_size = 4096;
|
|
else if ( info->max_frame_size > 65535 )
|
|
info->max_frame_size = 65535;
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
|
|
info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
|
|
info->phys_memory_base, info->phys_lcr_base,
|
|
info->max_frame_size );
|
|
} else {
|
|
printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
|
|
info->device_name, info->io_base, info->irq_level, info->dma_level,
|
|
info->max_frame_size );
|
|
}
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
hdlcdev_init(info);
|
|
#endif
|
|
|
|
} /* end of mgsl_add_device() */
|
|
|
|
static const struct tty_port_operations mgsl_port_ops = {
|
|
.carrier_raised = carrier_raised,
|
|
.dtr_rts = dtr_rts,
|
|
};
|
|
|
|
|
|
/* mgsl_allocate_device()
|
|
*
|
|
* Allocate and initialize a device instance structure
|
|
*
|
|
* Arguments: none
|
|
* Return Value: pointer to mgsl_struct if success, otherwise NULL
|
|
*/
|
|
static struct mgsl_struct* mgsl_allocate_device(void)
|
|
{
|
|
struct mgsl_struct *info;
|
|
|
|
info = kzalloc(sizeof(struct mgsl_struct),
|
|
GFP_KERNEL);
|
|
|
|
if (!info) {
|
|
printk("Error can't allocate device instance data\n");
|
|
} else {
|
|
tty_port_init(&info->port);
|
|
info->port.ops = &mgsl_port_ops;
|
|
info->magic = MGSL_MAGIC;
|
|
INIT_WORK(&info->task, mgsl_bh_handler);
|
|
info->max_frame_size = 4096;
|
|
info->port.close_delay = 5*HZ/10;
|
|
info->port.closing_wait = 30*HZ;
|
|
init_waitqueue_head(&info->status_event_wait_q);
|
|
init_waitqueue_head(&info->event_wait_q);
|
|
spin_lock_init(&info->irq_spinlock);
|
|
spin_lock_init(&info->netlock);
|
|
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
|
|
info->idle_mode = HDLC_TXIDLE_FLAGS;
|
|
info->num_tx_dma_buffers = 1;
|
|
info->num_tx_holding_buffers = 0;
|
|
}
|
|
|
|
return info;
|
|
|
|
} /* end of mgsl_allocate_device()*/
|
|
|
|
static const struct tty_operations mgsl_ops = {
|
|
.install = mgsl_install,
|
|
.open = mgsl_open,
|
|
.close = mgsl_close,
|
|
.write = mgsl_write,
|
|
.put_char = mgsl_put_char,
|
|
.flush_chars = mgsl_flush_chars,
|
|
.write_room = mgsl_write_room,
|
|
.chars_in_buffer = mgsl_chars_in_buffer,
|
|
.flush_buffer = mgsl_flush_buffer,
|
|
.ioctl = mgsl_ioctl,
|
|
.throttle = mgsl_throttle,
|
|
.unthrottle = mgsl_unthrottle,
|
|
.send_xchar = mgsl_send_xchar,
|
|
.break_ctl = mgsl_break,
|
|
.wait_until_sent = mgsl_wait_until_sent,
|
|
.set_termios = mgsl_set_termios,
|
|
.stop = mgsl_stop,
|
|
.start = mgsl_start,
|
|
.hangup = mgsl_hangup,
|
|
.tiocmget = tiocmget,
|
|
.tiocmset = tiocmset,
|
|
.get_icount = msgl_get_icount,
|
|
.proc_fops = &mgsl_proc_fops,
|
|
};
|
|
|
|
/*
|
|
* perform tty device initialization
|
|
*/
|
|
static int mgsl_init_tty(void)
|
|
{
|
|
int rc;
|
|
|
|
serial_driver = alloc_tty_driver(128);
|
|
if (!serial_driver)
|
|
return -ENOMEM;
|
|
|
|
serial_driver->driver_name = "synclink";
|
|
serial_driver->name = "ttySL";
|
|
serial_driver->major = ttymajor;
|
|
serial_driver->minor_start = 64;
|
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
serial_driver->init_termios = tty_std_termios;
|
|
serial_driver->init_termios.c_cflag =
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->init_termios.c_ispeed = 9600;
|
|
serial_driver->init_termios.c_ospeed = 9600;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(serial_driver, &mgsl_ops);
|
|
if ((rc = tty_register_driver(serial_driver)) < 0) {
|
|
printk("%s(%d):Couldn't register serial driver\n",
|
|
__FILE__,__LINE__);
|
|
put_tty_driver(serial_driver);
|
|
serial_driver = NULL;
|
|
return rc;
|
|
}
|
|
|
|
printk("%s %s, tty major#%d\n",
|
|
driver_name, driver_version,
|
|
serial_driver->major);
|
|
return 0;
|
|
}
|
|
|
|
/* enumerate user specified ISA adapters
|
|
*/
|
|
static void mgsl_enum_isa_devices(void)
|
|
{
|
|
struct mgsl_struct *info;
|
|
int i;
|
|
|
|
/* Check for user specified ISA devices */
|
|
|
|
for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
|
|
io[i], irq[i], dma[i] );
|
|
|
|
info = mgsl_allocate_device();
|
|
if ( !info ) {
|
|
/* error allocating device instance data */
|
|
if ( debug_level >= DEBUG_LEVEL_ERROR )
|
|
printk( "can't allocate device instance data.\n");
|
|
continue;
|
|
}
|
|
|
|
/* Copy user configuration info to device instance data */
|
|
info->io_base = (unsigned int)io[i];
|
|
info->irq_level = (unsigned int)irq[i];
|
|
info->irq_level = irq_canonicalize(info->irq_level);
|
|
info->dma_level = (unsigned int)dma[i];
|
|
info->bus_type = MGSL_BUS_TYPE_ISA;
|
|
info->io_addr_size = 16;
|
|
info->irq_flags = 0;
|
|
|
|
mgsl_add_device( info );
|
|
}
|
|
}
|
|
|
|
static void synclink_cleanup(void)
|
|
{
|
|
int rc;
|
|
struct mgsl_struct *info;
|
|
struct mgsl_struct *tmp;
|
|
|
|
printk("Unloading %s: %s\n", driver_name, driver_version);
|
|
|
|
if (serial_driver) {
|
|
if ((rc = tty_unregister_driver(serial_driver)))
|
|
printk("%s(%d) failed to unregister tty driver err=%d\n",
|
|
__FILE__,__LINE__,rc);
|
|
put_tty_driver(serial_driver);
|
|
}
|
|
|
|
info = mgsl_device_list;
|
|
while(info) {
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
hdlcdev_exit(info);
|
|
#endif
|
|
mgsl_release_resources(info);
|
|
tmp = info;
|
|
info = info->next_device;
|
|
kfree(tmp);
|
|
}
|
|
|
|
if (pci_registered)
|
|
pci_unregister_driver(&synclink_pci_driver);
|
|
}
|
|
|
|
static int __init synclink_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (break_on_load) {
|
|
mgsl_get_text_ptr();
|
|
BREAKPOINT();
|
|
}
|
|
|
|
printk("%s %s\n", driver_name, driver_version);
|
|
|
|
mgsl_enum_isa_devices();
|
|
if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
|
|
printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
|
|
else
|
|
pci_registered = true;
|
|
|
|
if ((rc = mgsl_init_tty()) < 0)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
synclink_cleanup();
|
|
return rc;
|
|
}
|
|
|
|
static void __exit synclink_exit(void)
|
|
{
|
|
synclink_cleanup();
|
|
}
|
|
|
|
module_init(synclink_init);
|
|
module_exit(synclink_exit);
|
|
|
|
/*
|
|
* usc_RTCmd()
|
|
*
|
|
* Issue a USC Receive/Transmit command to the
|
|
* Channel Command/Address Register (CCAR).
|
|
*
|
|
* Notes:
|
|
*
|
|
* The command is encoded in the most significant 5 bits <15..11>
|
|
* of the CCAR value. Bits <10..7> of the CCAR must be preserved
|
|
* and Bits <6..0> must be written as zeros.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device information structure
|
|
* Cmd command mask (use symbolic macros)
|
|
*
|
|
* Return Value:
|
|
*
|
|
* None
|
|
*/
|
|
static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
|
|
{
|
|
/* output command to CCAR in bits <15..11> */
|
|
/* preserve bits <10..7>, bits <6..0> must be zero */
|
|
|
|
outw( Cmd + info->loopback_bits, info->io_base + CCAR );
|
|
|
|
/* Read to flush write to CCAR */
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
inw( info->io_base + CCAR );
|
|
|
|
} /* end of usc_RTCmd() */
|
|
|
|
/*
|
|
* usc_DmaCmd()
|
|
*
|
|
* Issue a DMA command to the DMA Command/Address Register (DCAR).
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device information structure
|
|
* Cmd DMA command mask (usc_DmaCmd_XX Macros)
|
|
*
|
|
* Return Value:
|
|
*
|
|
* None
|
|
*/
|
|
static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
|
|
{
|
|
/* write command mask to DCAR */
|
|
outw( Cmd + info->mbre_bit, info->io_base );
|
|
|
|
/* Read to flush write to DCAR */
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
inw( info->io_base );
|
|
|
|
} /* end of usc_DmaCmd() */
|
|
|
|
/*
|
|
* usc_OutDmaReg()
|
|
*
|
|
* Write a 16-bit value to a USC DMA register
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device info structure
|
|
* RegAddr register address (number) for write
|
|
* RegValue 16-bit value to write to register
|
|
*
|
|
* Return Value:
|
|
*
|
|
* None
|
|
*
|
|
*/
|
|
static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
|
|
{
|
|
/* Note: The DCAR is located at the adapter base address */
|
|
/* Note: must preserve state of BIT8 in DCAR */
|
|
|
|
outw( RegAddr + info->mbre_bit, info->io_base );
|
|
outw( RegValue, info->io_base );
|
|
|
|
/* Read to flush write to DCAR */
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
inw( info->io_base );
|
|
|
|
} /* end of usc_OutDmaReg() */
|
|
|
|
/*
|
|
* usc_InDmaReg()
|
|
*
|
|
* Read a 16-bit value from a DMA register
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device info structure
|
|
* RegAddr register address (number) to read from
|
|
*
|
|
* Return Value:
|
|
*
|
|
* The 16-bit value read from register
|
|
*
|
|
*/
|
|
static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
|
|
{
|
|
/* Note: The DCAR is located at the adapter base address */
|
|
/* Note: must preserve state of BIT8 in DCAR */
|
|
|
|
outw( RegAddr + info->mbre_bit, info->io_base );
|
|
return inw( info->io_base );
|
|
|
|
} /* end of usc_InDmaReg() */
|
|
|
|
/*
|
|
*
|
|
* usc_OutReg()
|
|
*
|
|
* Write a 16-bit value to a USC serial channel register
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device info structure
|
|
* RegAddr register address (number) to write to
|
|
* RegValue 16-bit value to write to register
|
|
*
|
|
* Return Value:
|
|
*
|
|
* None
|
|
*
|
|
*/
|
|
static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
|
|
{
|
|
outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
|
|
outw( RegValue, info->io_base + CCAR );
|
|
|
|
/* Read to flush write to CCAR */
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
inw( info->io_base + CCAR );
|
|
|
|
} /* end of usc_OutReg() */
|
|
|
|
/*
|
|
* usc_InReg()
|
|
*
|
|
* Reads a 16-bit value from a USC serial channel register
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device extension
|
|
* RegAddr register address (number) to read from
|
|
*
|
|
* Return Value:
|
|
*
|
|
* 16-bit value read from register
|
|
*/
|
|
static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
|
|
{
|
|
outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
|
|
return inw( info->io_base + CCAR );
|
|
|
|
} /* end of usc_InReg() */
|
|
|
|
/* usc_set_sdlc_mode()
|
|
*
|
|
* Set up the adapter for SDLC DMA communications.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: NONE
|
|
*/
|
|
static void usc_set_sdlc_mode( struct mgsl_struct *info )
|
|
{
|
|
u16 RegValue;
|
|
bool PreSL1660;
|
|
|
|
/*
|
|
* determine if the IUSC on the adapter is pre-SL1660. If
|
|
* not, take advantage of the UnderWait feature of more
|
|
* modern chips. If an underrun occurs and this bit is set,
|
|
* the transmitter will idle the programmed idle pattern
|
|
* until the driver has time to service the underrun. Otherwise,
|
|
* the dma controller may get the cycles previously requested
|
|
* and begin transmitting queued tx data.
|
|
*/
|
|
usc_OutReg(info,TMCR,0x1f);
|
|
RegValue=usc_InReg(info,TMDR);
|
|
PreSL1660 = (RegValue == IUSC_PRE_SL1660);
|
|
|
|
if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
|
|
{
|
|
/*
|
|
** Channel Mode Register (CMR)
|
|
**
|
|
** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
|
|
** <13> 0 0 = Transmit Disabled (initially)
|
|
** <12> 0 1 = Consecutive Idles share common 0
|
|
** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
|
|
** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
|
|
** <3..0> 0110 Receiver Mode = HDLC/SDLC
|
|
**
|
|
** 1000 1110 0000 0110 = 0x8e06
|
|
*/
|
|
RegValue = 0x8e06;
|
|
|
|
/*--------------------------------------------------
|
|
* ignore user options for UnderRun Actions and
|
|
* preambles
|
|
*--------------------------------------------------*/
|
|
}
|
|
else
|
|
{
|
|
/* Channel mode Register (CMR)
|
|
*
|
|
* <15..14> 00 Tx Sub modes, Underrun Action
|
|
* <13> 0 1 = Send Preamble before opening flag
|
|
* <12> 0 1 = Consecutive Idles share common 0
|
|
* <11..8> 0110 Transmitter mode = HDLC/SDLC
|
|
* <7..4> 0000 Rx Sub modes, addr/ctrl field handling
|
|
* <3..0> 0110 Receiver mode = HDLC/SDLC
|
|
*
|
|
* 0000 0110 0000 0110 = 0x0606
|
|
*/
|
|
if (info->params.mode == MGSL_MODE_RAW) {
|
|
RegValue = 0x0001; /* Set Receive mode = external sync */
|
|
|
|
usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
|
|
(unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
|
|
|
|
/*
|
|
* TxSubMode:
|
|
* CMR <15> 0 Don't send CRC on Tx Underrun
|
|
* CMR <14> x undefined
|
|
* CMR <13> 0 Send preamble before openning sync
|
|
* CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
|
|
*
|
|
* TxMode:
|
|
* CMR <11-8) 0100 MonoSync
|
|
*
|
|
* 0x00 0100 xxxx xxxx 04xx
|
|
*/
|
|
RegValue |= 0x0400;
|
|
}
|
|
else {
|
|
|
|
RegValue = 0x0606;
|
|
|
|
if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
|
|
RegValue |= BIT14;
|
|
else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
|
|
RegValue |= BIT15;
|
|
else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
|
|
RegValue |= BIT15 + BIT14;
|
|
}
|
|
|
|
if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
|
|
RegValue |= BIT13;
|
|
}
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC &&
|
|
(info->params.flags & HDLC_FLAG_SHARE_ZERO) )
|
|
RegValue |= BIT12;
|
|
|
|
if ( info->params.addr_filter != 0xff )
|
|
{
|
|
/* set up receive address filtering */
|
|
usc_OutReg( info, RSR, info->params.addr_filter );
|
|
RegValue |= BIT4;
|
|
}
|
|
|
|
usc_OutReg( info, CMR, RegValue );
|
|
info->cmr_value = RegValue;
|
|
|
|
/* Receiver mode Register (RMR)
|
|
*
|
|
* <15..13> 000 encoding
|
|
* <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
|
|
* <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
|
|
* <9> 0 1 = Include Receive chars in CRC
|
|
* <8> 1 1 = Use Abort/PE bit as abort indicator
|
|
* <7..6> 00 Even parity
|
|
* <5> 0 parity disabled
|
|
* <4..2> 000 Receive Char Length = 8 bits
|
|
* <1..0> 00 Disable Receiver
|
|
*
|
|
* 0000 0101 0000 0000 = 0x0500
|
|
*/
|
|
|
|
RegValue = 0x0500;
|
|
|
|
switch ( info->params.encoding ) {
|
|
case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
|
|
case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
|
|
case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
|
|
case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
|
|
case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
|
|
case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
|
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
|
|
}
|
|
|
|
if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
|
|
RegValue |= BIT9;
|
|
else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
|
|
RegValue |= ( BIT12 | BIT10 | BIT9 );
|
|
|
|
usc_OutReg( info, RMR, RegValue );
|
|
|
|
/* Set the Receive count Limit Register (RCLR) to 0xffff. */
|
|
/* When an opening flag of an SDLC frame is recognized the */
|
|
/* Receive Character count (RCC) is loaded with the value in */
|
|
/* RCLR. The RCC is decremented for each received byte. The */
|
|
/* value of RCC is stored after the closing flag of the frame */
|
|
/* allowing the frame size to be computed. */
|
|
|
|
usc_OutReg( info, RCLR, RCLRVALUE );
|
|
|
|
usc_RCmd( info, RCmd_SelectRicrdma_level );
|
|
|
|
/* Receive Interrupt Control Register (RICR)
|
|
*
|
|
* <15..8> ? RxFIFO DMA Request Level
|
|
* <7> 0 Exited Hunt IA (Interrupt Arm)
|
|
* <6> 0 Idle Received IA
|
|
* <5> 0 Break/Abort IA
|
|
* <4> 0 Rx Bound IA
|
|
* <3> 1 Queued status reflects oldest 2 bytes in FIFO
|
|
* <2> 0 Abort/PE IA
|
|
* <1> 1 Rx Overrun IA
|
|
* <0> 0 Select TC0 value for readback
|
|
*
|
|
* 0000 0000 0000 1000 = 0x000a
|
|
*/
|
|
|
|
/* Carry over the Exit Hunt and Idle Received bits */
|
|
/* in case they have been armed by usc_ArmEvents. */
|
|
|
|
RegValue = usc_InReg( info, RICR ) & 0xc0;
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
|
|
else
|
|
usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
|
|
|
|
/* Unlatch all Rx status bits and clear Rx status IRQ Pending */
|
|
|
|
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
|
|
|
|
/* Transmit mode Register (TMR)
|
|
*
|
|
* <15..13> 000 encoding
|
|
* <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
|
|
* <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
|
|
* <9> 0 1 = Tx CRC Enabled
|
|
* <8> 0 1 = Append CRC to end of transmit frame
|
|
* <7..6> 00 Transmit parity Even
|
|
* <5> 0 Transmit parity Disabled
|
|
* <4..2> 000 Tx Char Length = 8 bits
|
|
* <1..0> 00 Disable Transmitter
|
|
*
|
|
* 0000 0100 0000 0000 = 0x0400
|
|
*/
|
|
|
|
RegValue = 0x0400;
|
|
|
|
switch ( info->params.encoding ) {
|
|
case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
|
|
case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
|
|
case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
|
|
case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
|
|
case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
|
|
case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
|
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
|
|
}
|
|
|
|
if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
|
|
RegValue |= BIT9 + BIT8;
|
|
else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
|
|
RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
|
|
|
|
usc_OutReg( info, TMR, RegValue );
|
|
|
|
usc_set_txidle( info );
|
|
|
|
|
|
usc_TCmd( info, TCmd_SelectTicrdma_level );
|
|
|
|
/* Transmit Interrupt Control Register (TICR)
|
|
*
|
|
* <15..8> ? Transmit FIFO DMA Level
|
|
* <7> 0 Present IA (Interrupt Arm)
|
|
* <6> 0 Idle Sent IA
|
|
* <5> 1 Abort Sent IA
|
|
* <4> 1 EOF/EOM Sent IA
|
|
* <3> 0 CRC Sent IA
|
|
* <2> 1 1 = Wait for SW Trigger to Start Frame
|
|
* <1> 1 Tx Underrun IA
|
|
* <0> 0 TC0 constant on read back
|
|
*
|
|
* 0000 0000 0011 0110 = 0x0036
|
|
*/
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
usc_OutReg( info, TICR, 0x0736 );
|
|
else
|
|
usc_OutReg( info, TICR, 0x1436 );
|
|
|
|
usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
|
|
|
|
/*
|
|
** Transmit Command/Status Register (TCSR)
|
|
**
|
|
** <15..12> 0000 TCmd
|
|
** <11> 0/1 UnderWait
|
|
** <10..08> 000 TxIdle
|
|
** <7> x PreSent
|
|
** <6> x IdleSent
|
|
** <5> x AbortSent
|
|
** <4> x EOF/EOM Sent
|
|
** <3> x CRC Sent
|
|
** <2> x All Sent
|
|
** <1> x TxUnder
|
|
** <0> x TxEmpty
|
|
**
|
|
** 0000 0000 0000 0000 = 0x0000
|
|
*/
|
|
info->tcsr_value = 0;
|
|
|
|
if ( !PreSL1660 )
|
|
info->tcsr_value |= TCSR_UNDERWAIT;
|
|
|
|
usc_OutReg( info, TCSR, info->tcsr_value );
|
|
|
|
/* Clock mode Control Register (CMCR)
|
|
*
|
|
* <15..14> 00 counter 1 Source = Disabled
|
|
* <13..12> 00 counter 0 Source = Disabled
|
|
* <11..10> 11 BRG1 Input is TxC Pin
|
|
* <9..8> 11 BRG0 Input is TxC Pin
|
|
* <7..6> 01 DPLL Input is BRG1 Output
|
|
* <5..3> XXX TxCLK comes from Port 0
|
|
* <2..0> XXX RxCLK comes from Port 1
|
|
*
|
|
* 0000 1111 0111 0111 = 0x0f77
|
|
*/
|
|
|
|
RegValue = 0x0f40;
|
|
|
|
if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
|
|
RegValue |= 0x0003; /* RxCLK from DPLL */
|
|
else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
|
|
RegValue |= 0x0004; /* RxCLK from BRG0 */
|
|
else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
|
|
RegValue |= 0x0006; /* RxCLK from TXC Input */
|
|
else
|
|
RegValue |= 0x0007; /* RxCLK from Port1 */
|
|
|
|
if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
|
|
RegValue |= 0x0018; /* TxCLK from DPLL */
|
|
else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
|
|
RegValue |= 0x0020; /* TxCLK from BRG0 */
|
|
else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
|
|
RegValue |= 0x0038; /* RxCLK from TXC Input */
|
|
else
|
|
RegValue |= 0x0030; /* TxCLK from Port0 */
|
|
|
|
usc_OutReg( info, CMCR, RegValue );
|
|
|
|
|
|
/* Hardware Configuration Register (HCR)
|
|
*
|
|
* <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
|
|
* <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
|
|
* <12> 0 CVOK:0=report code violation in biphase
|
|
* <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
|
|
* <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
|
|
* <7..6> 00 reserved
|
|
* <5> 0 BRG1 mode:0=continuous,1=single cycle
|
|
* <4> X BRG1 Enable
|
|
* <3..2> 00 reserved
|
|
* <1> 0 BRG0 mode:0=continuous,1=single cycle
|
|
* <0> 0 BRG0 Enable
|
|
*/
|
|
|
|
RegValue = 0x0000;
|
|
|
|
if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
|
|
u32 XtalSpeed;
|
|
u32 DpllDivisor;
|
|
u16 Tc;
|
|
|
|
/* DPLL is enabled. Use BRG1 to provide continuous reference clock */
|
|
/* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
XtalSpeed = 11059200;
|
|
else
|
|
XtalSpeed = 14745600;
|
|
|
|
if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
|
|
DpllDivisor = 16;
|
|
RegValue |= BIT10;
|
|
}
|
|
else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
|
|
DpllDivisor = 8;
|
|
RegValue |= BIT11;
|
|
}
|
|
else
|
|
DpllDivisor = 32;
|
|
|
|
/* Tc = (Xtal/Speed) - 1 */
|
|
/* If twice the remainder of (Xtal/Speed) is greater than Speed */
|
|
/* then rounding up gives a more precise time constant. Instead */
|
|
/* of rounding up and then subtracting 1 we just don't subtract */
|
|
/* the one in this case. */
|
|
|
|
/*--------------------------------------------------
|
|
* ejz: for DPLL mode, application should use the
|
|
* same clock speed as the partner system, even
|
|
* though clocking is derived from the input RxData.
|
|
* In case the user uses a 0 for the clock speed,
|
|
* default to 0xffffffff and don't try to divide by
|
|
* zero
|
|
*--------------------------------------------------*/
|
|
if ( info->params.clock_speed )
|
|
{
|
|
Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
|
|
if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
|
|
/ info->params.clock_speed) )
|
|
Tc--;
|
|
}
|
|
else
|
|
Tc = -1;
|
|
|
|
|
|
/* Write 16-bit Time Constant for BRG1 */
|
|
usc_OutReg( info, TC1R, Tc );
|
|
|
|
RegValue |= BIT4; /* enable BRG1 */
|
|
|
|
switch ( info->params.encoding ) {
|
|
case HDLC_ENCODING_NRZ:
|
|
case HDLC_ENCODING_NRZB:
|
|
case HDLC_ENCODING_NRZI_MARK:
|
|
case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
|
|
case HDLC_ENCODING_BIPHASE_MARK:
|
|
case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
|
|
case HDLC_ENCODING_BIPHASE_LEVEL:
|
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
|
|
}
|
|
}
|
|
|
|
usc_OutReg( info, HCR, RegValue );
|
|
|
|
|
|
/* Channel Control/status Register (CCSR)
|
|
*
|
|
* <15> X RCC FIFO Overflow status (RO)
|
|
* <14> X RCC FIFO Not Empty status (RO)
|
|
* <13> 0 1 = Clear RCC FIFO (WO)
|
|
* <12> X DPLL Sync (RW)
|
|
* <11> X DPLL 2 Missed Clocks status (RO)
|
|
* <10> X DPLL 1 Missed Clock status (RO)
|
|
* <9..8> 00 DPLL Resync on rising and falling edges (RW)
|
|
* <7> X SDLC Loop On status (RO)
|
|
* <6> X SDLC Loop Send status (RO)
|
|
* <5> 1 Bypass counters for TxClk and RxClk (RW)
|
|
* <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
|
|
* <1..0> 00 reserved
|
|
*
|
|
* 0000 0000 0010 0000 = 0x0020
|
|
*/
|
|
|
|
usc_OutReg( info, CCSR, 0x1020 );
|
|
|
|
|
|
if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
|
|
usc_OutReg( info, SICR,
|
|
(u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
|
|
}
|
|
|
|
|
|
/* enable Master Interrupt Enable bit (MIE) */
|
|
usc_EnableMasterIrqBit( info );
|
|
|
|
usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
|
|
TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
|
|
|
|
/* arm RCC underflow interrupt */
|
|
usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
|
|
usc_EnableInterrupts(info, MISC);
|
|
|
|
info->mbre_bit = 0;
|
|
outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
|
|
usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
|
|
info->mbre_bit = BIT8;
|
|
outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
|
|
|
|
if (info->bus_type == MGSL_BUS_TYPE_ISA) {
|
|
/* Enable DMAEN (Port 7, Bit 14) */
|
|
/* This connects the DMA request signal to the ISA bus */
|
|
usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
|
|
}
|
|
|
|
/* DMA Control Register (DCR)
|
|
*
|
|
* <15..14> 10 Priority mode = Alternating Tx/Rx
|
|
* 01 Rx has priority
|
|
* 00 Tx has priority
|
|
*
|
|
* <13> 1 Enable Priority Preempt per DCR<15..14>
|
|
* (WARNING DCR<11..10> must be 00 when this is 1)
|
|
* 0 Choose activate channel per DCR<11..10>
|
|
*
|
|
* <12> 0 Little Endian for Array/List
|
|
* <11..10> 00 Both Channels can use each bus grant
|
|
* <9..6> 0000 reserved
|
|
* <5> 0 7 CLK - Minimum Bus Re-request Interval
|
|
* <4> 0 1 = drive D/C and S/D pins
|
|
* <3> 1 1 = Add one wait state to all DMA cycles.
|
|
* <2> 0 1 = Strobe /UAS on every transfer.
|
|
* <1..0> 11 Addr incrementing only affects LS24 bits
|
|
*
|
|
* 0110 0000 0000 1011 = 0x600b
|
|
*/
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
/* PCI adapter does not need DMA wait state */
|
|
usc_OutDmaReg( info, DCR, 0xa00b );
|
|
}
|
|
else
|
|
usc_OutDmaReg( info, DCR, 0x800b );
|
|
|
|
|
|
/* Receive DMA mode Register (RDMR)
|
|
*
|
|
* <15..14> 11 DMA mode = Linked List Buffer mode
|
|
* <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
|
|
* <12> 1 Clear count of List Entry after fetching
|
|
* <11..10> 00 Address mode = Increment
|
|
* <9> 1 Terminate Buffer on RxBound
|
|
* <8> 0 Bus Width = 16bits
|
|
* <7..0> ? status Bits (write as 0s)
|
|
*
|
|
* 1111 0010 0000 0000 = 0xf200
|
|
*/
|
|
|
|
usc_OutDmaReg( info, RDMR, 0xf200 );
|
|
|
|
|
|
/* Transmit DMA mode Register (TDMR)
|
|
*
|
|
* <15..14> 11 DMA mode = Linked List Buffer mode
|
|
* <13> 1 TCBinA/L = fetch Tx Control Block from List entry
|
|
* <12> 1 Clear count of List Entry after fetching
|
|
* <11..10> 00 Address mode = Increment
|
|
* <9> 1 Terminate Buffer on end of frame
|
|
* <8> 0 Bus Width = 16bits
|
|
* <7..0> ? status Bits (Read Only so write as 0)
|
|
*
|
|
* 1111 0010 0000 0000 = 0xf200
|
|
*/
|
|
|
|
usc_OutDmaReg( info, TDMR, 0xf200 );
|
|
|
|
|
|
/* DMA Interrupt Control Register (DICR)
|
|
*
|
|
* <15> 1 DMA Interrupt Enable
|
|
* <14> 0 1 = Disable IEO from USC
|
|
* <13> 0 1 = Don't provide vector during IntAck
|
|
* <12> 1 1 = Include status in Vector
|
|
* <10..2> 0 reserved, Must be 0s
|
|
* <1> 0 1 = Rx DMA Interrupt Enabled
|
|
* <0> 0 1 = Tx DMA Interrupt Enabled
|
|
*
|
|
* 1001 0000 0000 0000 = 0x9000
|
|
*/
|
|
|
|
usc_OutDmaReg( info, DICR, 0x9000 );
|
|
|
|
usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
|
|
usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
|
|
usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
|
|
|
|
/* Channel Control Register (CCR)
|
|
*
|
|
* <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
|
|
* <13> 0 Trigger Tx on SW Command Disabled
|
|
* <12> 0 Flag Preamble Disabled
|
|
* <11..10> 00 Preamble Length
|
|
* <9..8> 00 Preamble Pattern
|
|
* <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
|
|
* <5> 0 Trigger Rx on SW Command Disabled
|
|
* <4..0> 0 reserved
|
|
*
|
|
* 1000 0000 1000 0000 = 0x8080
|
|
*/
|
|
|
|
RegValue = 0x8080;
|
|
|
|
switch ( info->params.preamble_length ) {
|
|
case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
|
|
case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
|
|
case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
|
|
}
|
|
|
|
switch ( info->params.preamble ) {
|
|
case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
|
|
case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
|
|
case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
|
|
case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
|
|
}
|
|
|
|
usc_OutReg( info, CCR, RegValue );
|
|
|
|
|
|
/*
|
|
* Burst/Dwell Control Register
|
|
*
|
|
* <15..8> 0x20 Maximum number of transfers per bus grant
|
|
* <7..0> 0x00 Maximum number of clock cycles per bus grant
|
|
*/
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
/* don't limit bus occupancy on PCI adapter */
|
|
usc_OutDmaReg( info, BDCR, 0x0000 );
|
|
}
|
|
else
|
|
usc_OutDmaReg( info, BDCR, 0x2000 );
|
|
|
|
usc_stop_transmitter(info);
|
|
usc_stop_receiver(info);
|
|
|
|
} /* end of usc_set_sdlc_mode() */
|
|
|
|
/* usc_enable_loopback()
|
|
*
|
|
* Set the 16C32 for internal loopback mode.
|
|
* The TxCLK and RxCLK signals are generated from the BRG0 and
|
|
* the TxD is looped back to the RxD internally.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* enable 1 = enable loopback, 0 = disable
|
|
* Return Value: None
|
|
*/
|
|
static void usc_enable_loopback(struct mgsl_struct *info, int enable)
|
|
{
|
|
if (enable) {
|
|
/* blank external TXD output */
|
|
usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
|
|
|
|
/* Clock mode Control Register (CMCR)
|
|
*
|
|
* <15..14> 00 counter 1 Disabled
|
|
* <13..12> 00 counter 0 Disabled
|
|
* <11..10> 11 BRG1 Input is TxC Pin
|
|
* <9..8> 11 BRG0 Input is TxC Pin
|
|
* <7..6> 01 DPLL Input is BRG1 Output
|
|
* <5..3> 100 TxCLK comes from BRG0
|
|
* <2..0> 100 RxCLK comes from BRG0
|
|
*
|
|
* 0000 1111 0110 0100 = 0x0f64
|
|
*/
|
|
|
|
usc_OutReg( info, CMCR, 0x0f64 );
|
|
|
|
/* Write 16-bit Time Constant for BRG0 */
|
|
/* use clock speed if available, otherwise use 8 for diagnostics */
|
|
if (info->params.clock_speed) {
|
|
if (info->bus_type == MGSL_BUS_TYPE_PCI)
|
|
usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
|
|
else
|
|
usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
|
|
} else
|
|
usc_OutReg(info, TC0R, (u16)8);
|
|
|
|
/* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
|
|
mode = Continuous Set Bit 0 to enable BRG0. */
|
|
usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
|
|
|
|
/* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
|
|
usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
|
|
|
|
/* set Internal Data loopback mode */
|
|
info->loopback_bits = 0x300;
|
|
outw( 0x0300, info->io_base + CCAR );
|
|
} else {
|
|
/* enable external TXD output */
|
|
usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
|
|
|
|
/* clear Internal Data loopback mode */
|
|
info->loopback_bits = 0;
|
|
outw( 0,info->io_base + CCAR );
|
|
}
|
|
|
|
} /* end of usc_enable_loopback() */
|
|
|
|
/* usc_enable_aux_clock()
|
|
*
|
|
* Enabled the AUX clock output at the specified frequency.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device extension
|
|
* data_rate data rate of clock in bits per second
|
|
* A data rate of 0 disables the AUX clock.
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
|
|
{
|
|
u32 XtalSpeed;
|
|
u16 Tc;
|
|
|
|
if ( data_rate ) {
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
XtalSpeed = 11059200;
|
|
else
|
|
XtalSpeed = 14745600;
|
|
|
|
|
|
/* Tc = (Xtal/Speed) - 1 */
|
|
/* If twice the remainder of (Xtal/Speed) is greater than Speed */
|
|
/* then rounding up gives a more precise time constant. Instead */
|
|
/* of rounding up and then subtracting 1 we just don't subtract */
|
|
/* the one in this case. */
|
|
|
|
|
|
Tc = (u16)(XtalSpeed/data_rate);
|
|
if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
|
|
Tc--;
|
|
|
|
/* Write 16-bit Time Constant for BRG0 */
|
|
usc_OutReg( info, TC0R, Tc );
|
|
|
|
/*
|
|
* Hardware Configuration Register (HCR)
|
|
* Clear Bit 1, BRG0 mode = Continuous
|
|
* Set Bit 0 to enable BRG0.
|
|
*/
|
|
|
|
usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
|
|
|
|
/* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
|
|
usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
|
|
} else {
|
|
/* data rate == 0 so turn off BRG0 */
|
|
usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
|
|
}
|
|
|
|
} /* end of usc_enable_aux_clock() */
|
|
|
|
/*
|
|
*
|
|
* usc_process_rxoverrun_sync()
|
|
*
|
|
* This function processes a receive overrun by resetting the
|
|
* receive DMA buffers and issuing a Purge Rx FIFO command
|
|
* to allow the receiver to continue receiving.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device extension
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
|
|
{
|
|
int start_index;
|
|
int end_index;
|
|
int frame_start_index;
|
|
bool start_of_frame_found = false;
|
|
bool end_of_frame_found = false;
|
|
bool reprogram_dma = false;
|
|
|
|
DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
|
|
u32 phys_addr;
|
|
|
|
usc_DmaCmd( info, DmaCmd_PauseRxChannel );
|
|
usc_RCmd( info, RCmd_EnterHuntmode );
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
|
|
/* CurrentRxBuffer points to the 1st buffer of the next */
|
|
/* possibly available receive frame. */
|
|
|
|
frame_start_index = start_index = end_index = info->current_rx_buffer;
|
|
|
|
/* Search for an unfinished string of buffers. This means */
|
|
/* that a receive frame started (at least one buffer with */
|
|
/* count set to zero) but there is no terminiting buffer */
|
|
/* (status set to non-zero). */
|
|
|
|
while( !buffer_list[end_index].count )
|
|
{
|
|
/* Count field has been reset to zero by 16C32. */
|
|
/* This buffer is currently in use. */
|
|
|
|
if ( !start_of_frame_found )
|
|
{
|
|
start_of_frame_found = true;
|
|
frame_start_index = end_index;
|
|
end_of_frame_found = false;
|
|
}
|
|
|
|
if ( buffer_list[end_index].status )
|
|
{
|
|
/* Status field has been set by 16C32. */
|
|
/* This is the last buffer of a received frame. */
|
|
|
|
/* We want to leave the buffers for this frame intact. */
|
|
/* Move on to next possible frame. */
|
|
|
|
start_of_frame_found = false;
|
|
end_of_frame_found = true;
|
|
}
|
|
|
|
/* advance to next buffer entry in linked list */
|
|
end_index++;
|
|
if ( end_index == info->rx_buffer_count )
|
|
end_index = 0;
|
|
|
|
if ( start_index == end_index )
|
|
{
|
|
/* The entire list has been searched with all Counts == 0 and */
|
|
/* all Status == 0. The receive buffers are */
|
|
/* completely screwed, reset all receive buffers! */
|
|
mgsl_reset_rx_dma_buffers( info );
|
|
frame_start_index = 0;
|
|
start_of_frame_found = false;
|
|
reprogram_dma = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( start_of_frame_found && !end_of_frame_found )
|
|
{
|
|
/* There is an unfinished string of receive DMA buffers */
|
|
/* as a result of the receiver overrun. */
|
|
|
|
/* Reset the buffers for the unfinished frame */
|
|
/* and reprogram the receive DMA controller to start */
|
|
/* at the 1st buffer of unfinished frame. */
|
|
|
|
start_index = frame_start_index;
|
|
|
|
do
|
|
{
|
|
*((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
|
|
|
|
/* Adjust index for wrap around. */
|
|
if ( start_index == info->rx_buffer_count )
|
|
start_index = 0;
|
|
|
|
} while( start_index != end_index );
|
|
|
|
reprogram_dma = true;
|
|
}
|
|
|
|
if ( reprogram_dma )
|
|
{
|
|
usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
|
|
usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
|
|
usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
|
|
|
|
usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
|
|
|
|
/* This empties the receive FIFO and loads the RCC with RCLR */
|
|
usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
|
|
|
|
/* program 16C32 with physical address of 1st DMA buffer entry */
|
|
phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
|
|
usc_OutDmaReg( info, NRARL, (u16)phys_addr );
|
|
usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
|
|
|
|
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
|
|
usc_EnableInterrupts( info, RECEIVE_STATUS );
|
|
|
|
/* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
|
|
/* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
|
|
|
|
usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
|
|
usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
|
|
usc_DmaCmd( info, DmaCmd_InitRxChannel );
|
|
if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
|
|
usc_EnableReceiver(info,ENABLE_AUTO_DCD);
|
|
else
|
|
usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
|
|
}
|
|
else
|
|
{
|
|
/* This empties the receive FIFO and loads the RCC with RCLR */
|
|
usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
}
|
|
|
|
} /* end of usc_process_rxoverrun_sync() */
|
|
|
|
/* usc_stop_receiver()
|
|
*
|
|
* Disable USC receiver
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_stop_receiver( struct mgsl_struct *info )
|
|
{
|
|
if (debug_level >= DEBUG_LEVEL_ISR)
|
|
printk("%s(%d):usc_stop_receiver(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
/* Disable receive DMA channel. */
|
|
/* This also disables receive DMA channel interrupts */
|
|
usc_DmaCmd( info, DmaCmd_ResetRxChannel );
|
|
|
|
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
|
|
usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
|
|
|
|
usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
|
|
|
|
/* This empties the receive FIFO and loads the RCC with RCLR */
|
|
usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
|
|
info->rx_enabled = false;
|
|
info->rx_overflow = false;
|
|
info->rx_rcc_underrun = false;
|
|
|
|
} /* end of stop_receiver() */
|
|
|
|
/* usc_start_receiver()
|
|
*
|
|
* Enable the USC receiver
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_start_receiver( struct mgsl_struct *info )
|
|
{
|
|
u32 phys_addr;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_ISR)
|
|
printk("%s(%d):usc_start_receiver(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
mgsl_reset_rx_dma_buffers( info );
|
|
usc_stop_receiver( info );
|
|
|
|
usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
|
|
if ( info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW ) {
|
|
/* DMA mode Transfers */
|
|
/* Program the DMA controller. */
|
|
/* Enable the DMA controller end of buffer interrupt. */
|
|
|
|
/* program 16C32 with physical address of 1st DMA buffer entry */
|
|
phys_addr = info->rx_buffer_list[0].phys_entry;
|
|
usc_OutDmaReg( info, NRARL, (u16)phys_addr );
|
|
usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
|
|
|
|
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
|
|
usc_EnableInterrupts( info, RECEIVE_STATUS );
|
|
|
|
/* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
|
|
/* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
|
|
|
|
usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
|
|
usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
|
|
usc_DmaCmd( info, DmaCmd_InitRxChannel );
|
|
if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
|
|
usc_EnableReceiver(info,ENABLE_AUTO_DCD);
|
|
else
|
|
usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
|
|
} else {
|
|
usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
|
|
usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
|
|
usc_EnableInterrupts(info, RECEIVE_DATA);
|
|
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
usc_RCmd( info, RCmd_EnterHuntmode );
|
|
|
|
usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
|
|
}
|
|
|
|
usc_OutReg( info, CCSR, 0x1020 );
|
|
|
|
info->rx_enabled = true;
|
|
|
|
} /* end of usc_start_receiver() */
|
|
|
|
/* usc_start_transmitter()
|
|
*
|
|
* Enable the USC transmitter and send a transmit frame if
|
|
* one is loaded in the DMA buffers.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_start_transmitter( struct mgsl_struct *info )
|
|
{
|
|
u32 phys_addr;
|
|
unsigned int FrameSize;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_ISR)
|
|
printk("%s(%d):usc_start_transmitter(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
if ( info->xmit_cnt ) {
|
|
|
|
/* If auto RTS enabled and RTS is inactive, then assert */
|
|
/* RTS and set a flag indicating that the driver should */
|
|
/* negate RTS when the transmission completes. */
|
|
|
|
info->drop_rts_on_tx_done = false;
|
|
|
|
if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
|
|
usc_get_serial_signals( info );
|
|
if ( !(info->serial_signals & SerialSignal_RTS) ) {
|
|
info->serial_signals |= SerialSignal_RTS;
|
|
usc_set_serial_signals( info );
|
|
info->drop_rts_on_tx_done = true;
|
|
}
|
|
}
|
|
|
|
|
|
if ( info->params.mode == MGSL_MODE_ASYNC ) {
|
|
if ( !info->tx_active ) {
|
|
usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
|
|
usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
|
|
usc_EnableInterrupts(info, TRANSMIT_DATA);
|
|
usc_load_txfifo(info);
|
|
}
|
|
} else {
|
|
/* Disable transmit DMA controller while programming. */
|
|
usc_DmaCmd( info, DmaCmd_ResetTxChannel );
|
|
|
|
/* Transmit DMA buffer is loaded, so program USC */
|
|
/* to send the frame contained in the buffers. */
|
|
|
|
FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
|
|
|
|
/* if operating in Raw sync mode, reset the rcc component
|
|
* of the tx dma buffer entry, otherwise, the serial controller
|
|
* will send a closing sync char after this count.
|
|
*/
|
|
if ( info->params.mode == MGSL_MODE_RAW )
|
|
info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
|
|
|
|
/* Program the Transmit Character Length Register (TCLR) */
|
|
/* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
|
|
usc_OutReg( info, TCLR, (u16)FrameSize );
|
|
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
|
|
/* Program the address of the 1st DMA Buffer Entry in linked list */
|
|
phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
|
|
usc_OutDmaReg( info, NTARL, (u16)phys_addr );
|
|
usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
|
|
|
|
usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
|
|
usc_EnableInterrupts( info, TRANSMIT_STATUS );
|
|
|
|
if ( info->params.mode == MGSL_MODE_RAW &&
|
|
info->num_tx_dma_buffers > 1 ) {
|
|
/* When running external sync mode, attempt to 'stream' transmit */
|
|
/* by filling tx dma buffers as they become available. To do this */
|
|
/* we need to enable Tx DMA EOB Status interrupts : */
|
|
/* */
|
|
/* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
|
|
/* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
|
|
|
|
usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
|
|
usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
|
|
}
|
|
|
|
/* Initialize Transmit DMA Channel */
|
|
usc_DmaCmd( info, DmaCmd_InitTxChannel );
|
|
|
|
usc_TCmd( info, TCmd_SendFrame );
|
|
|
|
mod_timer(&info->tx_timer, jiffies +
|
|
msecs_to_jiffies(5000));
|
|
}
|
|
info->tx_active = true;
|
|
}
|
|
|
|
if ( !info->tx_enabled ) {
|
|
info->tx_enabled = true;
|
|
if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
|
|
usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
|
|
else
|
|
usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
|
|
}
|
|
|
|
} /* end of usc_start_transmitter() */
|
|
|
|
/* usc_stop_transmitter()
|
|
*
|
|
* Stops the transmitter and DMA
|
|
*
|
|
* Arguments: info pointer to device isntance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_stop_transmitter( struct mgsl_struct *info )
|
|
{
|
|
if (debug_level >= DEBUG_LEVEL_ISR)
|
|
printk("%s(%d):usc_stop_transmitter(%s)\n",
|
|
__FILE__,__LINE__, info->device_name );
|
|
|
|
del_timer(&info->tx_timer);
|
|
|
|
usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
|
|
usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
|
|
|
|
usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
|
|
usc_DmaCmd( info, DmaCmd_ResetTxChannel );
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
|
|
info->tx_enabled = false;
|
|
info->tx_active = false;
|
|
|
|
} /* end of usc_stop_transmitter() */
|
|
|
|
/* usc_load_txfifo()
|
|
*
|
|
* Fill the transmit FIFO until the FIFO is full or
|
|
* there is no more data to load.
|
|
*
|
|
* Arguments: info pointer to device extension (instance data)
|
|
* Return Value: None
|
|
*/
|
|
static void usc_load_txfifo( struct mgsl_struct *info )
|
|
{
|
|
int Fifocount;
|
|
u8 TwoBytes[2];
|
|
|
|
if ( !info->xmit_cnt && !info->x_char )
|
|
return;
|
|
|
|
/* Select transmit FIFO status readback in TICR */
|
|
usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
|
|
|
|
/* load the Transmit FIFO until FIFOs full or all data sent */
|
|
|
|
while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
|
|
/* there is more space in the transmit FIFO and */
|
|
/* there is more data in transmit buffer */
|
|
|
|
if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
|
|
/* write a 16-bit word from transmit buffer to 16C32 */
|
|
|
|
TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
|
|
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
|
|
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
|
|
outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
|
|
|
|
info->xmit_cnt -= 2;
|
|
info->icount.tx += 2;
|
|
} else {
|
|
/* only 1 byte left to transmit or 1 FIFO slot left */
|
|
|
|
outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
|
|
info->io_base + CCAR );
|
|
|
|
if (info->x_char) {
|
|
/* transmit pending high priority char */
|
|
outw( info->x_char,info->io_base + CCAR );
|
|
info->x_char = 0;
|
|
} else {
|
|
outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
|
|
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
info->xmit_cnt--;
|
|
}
|
|
info->icount.tx++;
|
|
}
|
|
}
|
|
|
|
} /* end of usc_load_txfifo() */
|
|
|
|
/* usc_reset()
|
|
*
|
|
* Reset the adapter to a known state and prepare it for further use.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_reset( struct mgsl_struct *info )
|
|
{
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
|
|
int i;
|
|
u32 readval;
|
|
|
|
/* Set BIT30 of Misc Control Register */
|
|
/* (Local Control Register 0x50) to force reset of USC. */
|
|
|
|
volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
|
|
u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
|
|
|
|
info->misc_ctrl_value |= BIT30;
|
|
*MiscCtrl = info->misc_ctrl_value;
|
|
|
|
/*
|
|
* Force at least 170ns delay before clearing
|
|
* reset bit. Each read from LCR takes at least
|
|
* 30ns so 10 times for 300ns to be safe.
|
|
*/
|
|
for(i=0;i<10;i++)
|
|
readval = *MiscCtrl;
|
|
|
|
info->misc_ctrl_value &= ~BIT30;
|
|
*MiscCtrl = info->misc_ctrl_value;
|
|
|
|
*LCR0BRDR = BUS_DESCRIPTOR(
|
|
1, // Write Strobe Hold (0-3)
|
|
2, // Write Strobe Delay (0-3)
|
|
2, // Read Strobe Delay (0-3)
|
|
0, // NWDD (Write data-data) (0-3)
|
|
4, // NWAD (Write Addr-data) (0-31)
|
|
0, // NXDA (Read/Write Data-Addr) (0-3)
|
|
0, // NRDD (Read Data-Data) (0-3)
|
|
5 // NRAD (Read Addr-Data) (0-31)
|
|
);
|
|
} else {
|
|
/* do HW reset */
|
|
outb( 0,info->io_base + 8 );
|
|
}
|
|
|
|
info->mbre_bit = 0;
|
|
info->loopback_bits = 0;
|
|
info->usc_idle_mode = 0;
|
|
|
|
/*
|
|
* Program the Bus Configuration Register (BCR)
|
|
*
|
|
* <15> 0 Don't use separate address
|
|
* <14..6> 0 reserved
|
|
* <5..4> 00 IAckmode = Default, don't care
|
|
* <3> 1 Bus Request Totem Pole output
|
|
* <2> 1 Use 16 Bit data bus
|
|
* <1> 0 IRQ Totem Pole output
|
|
* <0> 0 Don't Shift Right Addr
|
|
*
|
|
* 0000 0000 0000 1100 = 0x000c
|
|
*
|
|
* By writing to io_base + SDPIN the Wait/Ack pin is
|
|
* programmed to work as a Wait pin.
|
|
*/
|
|
|
|
outw( 0x000c,info->io_base + SDPIN );
|
|
|
|
|
|
outw( 0,info->io_base );
|
|
outw( 0,info->io_base + CCAR );
|
|
|
|
/* select little endian byte ordering */
|
|
usc_RTCmd( info, RTCmd_SelectLittleEndian );
|
|
|
|
|
|
/* Port Control Register (PCR)
|
|
*
|
|
* <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
|
|
* <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
|
|
* <11..10> 00 Port 5 is Input (No Connect, Don't Care)
|
|
* <9..8> 00 Port 4 is Input (No Connect, Don't Care)
|
|
* <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
|
|
* <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
|
|
* <3..2> 01 Port 1 is Input (Dedicated RxC)
|
|
* <1..0> 01 Port 0 is Input (Dedicated TxC)
|
|
*
|
|
* 1111 0000 1111 0101 = 0xf0f5
|
|
*/
|
|
|
|
usc_OutReg( info, PCR, 0xf0f5 );
|
|
|
|
|
|
/*
|
|
* Input/Output Control Register
|
|
*
|
|
* <15..14> 00 CTS is active low input
|
|
* <13..12> 00 DCD is active low input
|
|
* <11..10> 00 TxREQ pin is input (DSR)
|
|
* <9..8> 00 RxREQ pin is input (RI)
|
|
* <7..6> 00 TxD is output (Transmit Data)
|
|
* <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
|
|
* <2..0> 100 RxC is Output (drive with BRG0)
|
|
*
|
|
* 0000 0000 0000 0100 = 0x0004
|
|
*/
|
|
|
|
usc_OutReg( info, IOCR, 0x0004 );
|
|
|
|
} /* end of usc_reset() */
|
|
|
|
/* usc_set_async_mode()
|
|
*
|
|
* Program adapter for asynchronous communications.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_set_async_mode( struct mgsl_struct *info )
|
|
{
|
|
u16 RegValue;
|
|
|
|
/* disable interrupts while programming USC */
|
|
usc_DisableMasterIrqBit( info );
|
|
|
|
outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
|
|
usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
|
|
|
|
usc_loopback_frame( info );
|
|
|
|
/* Channel mode Register (CMR)
|
|
*
|
|
* <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
|
|
* <13..12> 00 00 = 16X Clock
|
|
* <11..8> 0000 Transmitter mode = Asynchronous
|
|
* <7..6> 00 reserved?
|
|
* <5..4> 00 Rx Sub modes, 00 = 16X Clock
|
|
* <3..0> 0000 Receiver mode = Asynchronous
|
|
*
|
|
* 0000 0000 0000 0000 = 0x0
|
|
*/
|
|
|
|
RegValue = 0;
|
|
if ( info->params.stop_bits != 1 )
|
|
RegValue |= BIT14;
|
|
usc_OutReg( info, CMR, RegValue );
|
|
|
|
|
|
/* Receiver mode Register (RMR)
|
|
*
|
|
* <15..13> 000 encoding = None
|
|
* <12..08> 00000 reserved (Sync Only)
|
|
* <7..6> 00 Even parity
|
|
* <5> 0 parity disabled
|
|
* <4..2> 000 Receive Char Length = 8 bits
|
|
* <1..0> 00 Disable Receiver
|
|
*
|
|
* 0000 0000 0000 0000 = 0x0
|
|
*/
|
|
|
|
RegValue = 0;
|
|
|
|
if ( info->params.data_bits != 8 )
|
|
RegValue |= BIT4+BIT3+BIT2;
|
|
|
|
if ( info->params.parity != ASYNC_PARITY_NONE ) {
|
|
RegValue |= BIT5;
|
|
if ( info->params.parity != ASYNC_PARITY_ODD )
|
|
RegValue |= BIT6;
|
|
}
|
|
|
|
usc_OutReg( info, RMR, RegValue );
|
|
|
|
|
|
/* Set IRQ trigger level */
|
|
|
|
usc_RCmd( info, RCmd_SelectRicrIntLevel );
|
|
|
|
|
|
/* Receive Interrupt Control Register (RICR)
|
|
*
|
|
* <15..8> ? RxFIFO IRQ Request Level
|
|
*
|
|
* Note: For async mode the receive FIFO level must be set
|
|
* to 0 to avoid the situation where the FIFO contains fewer bytes
|
|
* than the trigger level and no more data is expected.
|
|
*
|
|
* <7> 0 Exited Hunt IA (Interrupt Arm)
|
|
* <6> 0 Idle Received IA
|
|
* <5> 0 Break/Abort IA
|
|
* <4> 0 Rx Bound IA
|
|
* <3> 0 Queued status reflects oldest byte in FIFO
|
|
* <2> 0 Abort/PE IA
|
|
* <1> 0 Rx Overrun IA
|
|
* <0> 0 Select TC0 value for readback
|
|
*
|
|
* 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
|
|
*/
|
|
|
|
usc_OutReg( info, RICR, 0x0000 );
|
|
|
|
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
|
|
|
|
|
|
/* Transmit mode Register (TMR)
|
|
*
|
|
* <15..13> 000 encoding = None
|
|
* <12..08> 00000 reserved (Sync Only)
|
|
* <7..6> 00 Transmit parity Even
|
|
* <5> 0 Transmit parity Disabled
|
|
* <4..2> 000 Tx Char Length = 8 bits
|
|
* <1..0> 00 Disable Transmitter
|
|
*
|
|
* 0000 0000 0000 0000 = 0x0
|
|
*/
|
|
|
|
RegValue = 0;
|
|
|
|
if ( info->params.data_bits != 8 )
|
|
RegValue |= BIT4+BIT3+BIT2;
|
|
|
|
if ( info->params.parity != ASYNC_PARITY_NONE ) {
|
|
RegValue |= BIT5;
|
|
if ( info->params.parity != ASYNC_PARITY_ODD )
|
|
RegValue |= BIT6;
|
|
}
|
|
|
|
usc_OutReg( info, TMR, RegValue );
|
|
|
|
usc_set_txidle( info );
|
|
|
|
|
|
/* Set IRQ trigger level */
|
|
|
|
usc_TCmd( info, TCmd_SelectTicrIntLevel );
|
|
|
|
|
|
/* Transmit Interrupt Control Register (TICR)
|
|
*
|
|
* <15..8> ? Transmit FIFO IRQ Level
|
|
* <7> 0 Present IA (Interrupt Arm)
|
|
* <6> 1 Idle Sent IA
|
|
* <5> 0 Abort Sent IA
|
|
* <4> 0 EOF/EOM Sent IA
|
|
* <3> 0 CRC Sent IA
|
|
* <2> 0 1 = Wait for SW Trigger to Start Frame
|
|
* <1> 0 Tx Underrun IA
|
|
* <0> 0 TC0 constant on read back
|
|
*
|
|
* 0000 0000 0100 0000 = 0x0040
|
|
*/
|
|
|
|
usc_OutReg( info, TICR, 0x1f40 );
|
|
|
|
usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
|
|
|
|
usc_enable_async_clock( info, info->params.data_rate );
|
|
|
|
|
|
/* Channel Control/status Register (CCSR)
|
|
*
|
|
* <15> X RCC FIFO Overflow status (RO)
|
|
* <14> X RCC FIFO Not Empty status (RO)
|
|
* <13> 0 1 = Clear RCC FIFO (WO)
|
|
* <12> X DPLL in Sync status (RO)
|
|
* <11> X DPLL 2 Missed Clocks status (RO)
|
|
* <10> X DPLL 1 Missed Clock status (RO)
|
|
* <9..8> 00 DPLL Resync on rising and falling edges (RW)
|
|
* <7> X SDLC Loop On status (RO)
|
|
* <6> X SDLC Loop Send status (RO)
|
|
* <5> 1 Bypass counters for TxClk and RxClk (RW)
|
|
* <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
|
|
* <1..0> 00 reserved
|
|
*
|
|
* 0000 0000 0010 0000 = 0x0020
|
|
*/
|
|
|
|
usc_OutReg( info, CCSR, 0x0020 );
|
|
|
|
usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
|
|
RECEIVE_DATA + RECEIVE_STATUS );
|
|
|
|
usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
|
|
RECEIVE_DATA + RECEIVE_STATUS );
|
|
|
|
usc_EnableMasterIrqBit( info );
|
|
|
|
if (info->bus_type == MGSL_BUS_TYPE_ISA) {
|
|
/* Enable INTEN (Port 6, Bit12) */
|
|
/* This connects the IRQ request signal to the ISA bus */
|
|
usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
|
|
}
|
|
|
|
if (info->params.loopback) {
|
|
info->loopback_bits = 0x300;
|
|
outw(0x0300, info->io_base + CCAR);
|
|
}
|
|
|
|
} /* end of usc_set_async_mode() */
|
|
|
|
/* usc_loopback_frame()
|
|
*
|
|
* Loop back a small (2 byte) dummy SDLC frame.
|
|
* Interrupts and DMA are NOT used. The purpose of this is to
|
|
* clear any 'stale' status info left over from running in async mode.
|
|
*
|
|
* The 16C32 shows the strange behaviour of marking the 1st
|
|
* received SDLC frame with a CRC error even when there is no
|
|
* CRC error. To get around this a small dummy from of 2 bytes
|
|
* is looped back when switching from async to sync mode.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_loopback_frame( struct mgsl_struct *info )
|
|
{
|
|
int i;
|
|
unsigned long oldmode = info->params.mode;
|
|
|
|
info->params.mode = MGSL_MODE_HDLC;
|
|
|
|
usc_DisableMasterIrqBit( info );
|
|
|
|
usc_set_sdlc_mode( info );
|
|
usc_enable_loopback( info, 1 );
|
|
|
|
/* Write 16-bit Time Constant for BRG0 */
|
|
usc_OutReg( info, TC0R, 0 );
|
|
|
|
/* Channel Control Register (CCR)
|
|
*
|
|
* <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
|
|
* <13> 0 Trigger Tx on SW Command Disabled
|
|
* <12> 0 Flag Preamble Disabled
|
|
* <11..10> 00 Preamble Length = 8-Bits
|
|
* <9..8> 01 Preamble Pattern = flags
|
|
* <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
|
|
* <5> 0 Trigger Rx on SW Command Disabled
|
|
* <4..0> 0 reserved
|
|
*
|
|
* 0000 0001 0000 0000 = 0x0100
|
|
*/
|
|
|
|
usc_OutReg( info, CCR, 0x0100 );
|
|
|
|
/* SETUP RECEIVER */
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
|
|
|
|
/* SETUP TRANSMITTER */
|
|
/* Program the Transmit Character Length Register (TCLR) */
|
|
/* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
|
|
usc_OutReg( info, TCLR, 2 );
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
|
|
/* unlatch Tx status bits, and start transmit channel. */
|
|
usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
|
|
outw(0,info->io_base + DATAREG);
|
|
|
|
/* ENABLE TRANSMITTER */
|
|
usc_TCmd( info, TCmd_SendFrame );
|
|
usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
|
|
|
|
/* WAIT FOR RECEIVE COMPLETE */
|
|
for (i=0 ; i<1000 ; i++)
|
|
if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
|
|
break;
|
|
|
|
/* clear Internal Data loopback mode */
|
|
usc_enable_loopback(info, 0);
|
|
|
|
usc_EnableMasterIrqBit(info);
|
|
|
|
info->params.mode = oldmode;
|
|
|
|
} /* end of usc_loopback_frame() */
|
|
|
|
/* usc_set_sync_mode() Programs the USC for SDLC communications.
|
|
*
|
|
* Arguments: info pointer to adapter info structure
|
|
* Return Value: None
|
|
*/
|
|
static void usc_set_sync_mode( struct mgsl_struct *info )
|
|
{
|
|
usc_loopback_frame( info );
|
|
usc_set_sdlc_mode( info );
|
|
|
|
if (info->bus_type == MGSL_BUS_TYPE_ISA) {
|
|
/* Enable INTEN (Port 6, Bit12) */
|
|
/* This connects the IRQ request signal to the ISA bus */
|
|
usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
|
|
}
|
|
|
|
usc_enable_aux_clock(info, info->params.clock_speed);
|
|
|
|
if (info->params.loopback)
|
|
usc_enable_loopback(info,1);
|
|
|
|
} /* end of mgsl_set_sync_mode() */
|
|
|
|
/* usc_set_txidle() Set the HDLC idle mode for the transmitter.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_set_txidle( struct mgsl_struct *info )
|
|
{
|
|
u16 usc_idle_mode = IDLEMODE_FLAGS;
|
|
|
|
/* Map API idle mode to USC register bits */
|
|
|
|
switch( info->idle_mode ){
|
|
case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
|
|
case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
|
|
case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
|
|
case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
|
|
case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
|
|
case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
|
|
case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
|
|
}
|
|
|
|
info->usc_idle_mode = usc_idle_mode;
|
|
//usc_OutReg(info, TCSR, usc_idle_mode);
|
|
info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
|
|
info->tcsr_value += usc_idle_mode;
|
|
usc_OutReg(info, TCSR, info->tcsr_value);
|
|
|
|
/*
|
|
* if SyncLink WAN adapter is running in external sync mode, the
|
|
* transmitter has been set to Monosync in order to try to mimic
|
|
* a true raw outbound bit stream. Monosync still sends an open/close
|
|
* sync char at the start/end of a frame. Try to match those sync
|
|
* patterns to the idle mode set here
|
|
*/
|
|
if ( info->params.mode == MGSL_MODE_RAW ) {
|
|
unsigned char syncpat = 0;
|
|
switch( info->idle_mode ) {
|
|
case HDLC_TXIDLE_FLAGS:
|
|
syncpat = 0x7e;
|
|
break;
|
|
case HDLC_TXIDLE_ALT_ZEROS_ONES:
|
|
syncpat = 0x55;
|
|
break;
|
|
case HDLC_TXIDLE_ZEROS:
|
|
case HDLC_TXIDLE_SPACE:
|
|
syncpat = 0x00;
|
|
break;
|
|
case HDLC_TXIDLE_ONES:
|
|
case HDLC_TXIDLE_MARK:
|
|
syncpat = 0xff;
|
|
break;
|
|
case HDLC_TXIDLE_ALT_MARK_SPACE:
|
|
syncpat = 0xaa;
|
|
break;
|
|
}
|
|
|
|
usc_SetTransmitSyncChars(info,syncpat,syncpat);
|
|
}
|
|
|
|
} /* end of usc_set_txidle() */
|
|
|
|
/* usc_get_serial_signals()
|
|
*
|
|
* Query the adapter for the state of the V24 status (input) signals.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_get_serial_signals( struct mgsl_struct *info )
|
|
{
|
|
u16 status;
|
|
|
|
/* clear all serial signals except DTR and RTS */
|
|
info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
|
|
|
|
/* Read the Misc Interrupt status Register (MISR) to get */
|
|
/* the V24 status signals. */
|
|
|
|
status = usc_InReg( info, MISR );
|
|
|
|
/* set serial signal bits to reflect MISR */
|
|
|
|
if ( status & MISCSTATUS_CTS )
|
|
info->serial_signals |= SerialSignal_CTS;
|
|
|
|
if ( status & MISCSTATUS_DCD )
|
|
info->serial_signals |= SerialSignal_DCD;
|
|
|
|
if ( status & MISCSTATUS_RI )
|
|
info->serial_signals |= SerialSignal_RI;
|
|
|
|
if ( status & MISCSTATUS_DSR )
|
|
info->serial_signals |= SerialSignal_DSR;
|
|
|
|
} /* end of usc_get_serial_signals() */
|
|
|
|
/* usc_set_serial_signals()
|
|
*
|
|
* Set the state of DTR and RTS based on contents of
|
|
* serial_signals member of device extension.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void usc_set_serial_signals( struct mgsl_struct *info )
|
|
{
|
|
u16 Control;
|
|
unsigned char V24Out = info->serial_signals;
|
|
|
|
/* get the current value of the Port Control Register (PCR) */
|
|
|
|
Control = usc_InReg( info, PCR );
|
|
|
|
if ( V24Out & SerialSignal_RTS )
|
|
Control &= ~(BIT6);
|
|
else
|
|
Control |= BIT6;
|
|
|
|
if ( V24Out & SerialSignal_DTR )
|
|
Control &= ~(BIT4);
|
|
else
|
|
Control |= BIT4;
|
|
|
|
usc_OutReg( info, PCR, Control );
|
|
|
|
} /* end of usc_set_serial_signals() */
|
|
|
|
/* usc_enable_async_clock()
|
|
*
|
|
* Enable the async clock at the specified frequency.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* data_rate data rate of clock in bps
|
|
* 0 disables the AUX clock.
|
|
* Return Value: None
|
|
*/
|
|
static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
|
|
{
|
|
if ( data_rate ) {
|
|
/*
|
|
* Clock mode Control Register (CMCR)
|
|
*
|
|
* <15..14> 00 counter 1 Disabled
|
|
* <13..12> 00 counter 0 Disabled
|
|
* <11..10> 11 BRG1 Input is TxC Pin
|
|
* <9..8> 11 BRG0 Input is TxC Pin
|
|
* <7..6> 01 DPLL Input is BRG1 Output
|
|
* <5..3> 100 TxCLK comes from BRG0
|
|
* <2..0> 100 RxCLK comes from BRG0
|
|
*
|
|
* 0000 1111 0110 0100 = 0x0f64
|
|
*/
|
|
|
|
usc_OutReg( info, CMCR, 0x0f64 );
|
|
|
|
|
|
/*
|
|
* Write 16-bit Time Constant for BRG0
|
|
* Time Constant = (ClkSpeed / data_rate) - 1
|
|
* ClkSpeed = 921600 (ISA), 691200 (PCI)
|
|
*/
|
|
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
|
|
else
|
|
usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
|
|
|
|
|
|
/*
|
|
* Hardware Configuration Register (HCR)
|
|
* Clear Bit 1, BRG0 mode = Continuous
|
|
* Set Bit 0 to enable BRG0.
|
|
*/
|
|
|
|
usc_OutReg( info, HCR,
|
|
(u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
|
|
|
|
|
|
/* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
|
|
|
|
usc_OutReg( info, IOCR,
|
|
(u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
|
|
} else {
|
|
/* data rate == 0 so turn off BRG0 */
|
|
usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
|
|
}
|
|
|
|
} /* end of usc_enable_async_clock() */
|
|
|
|
/*
|
|
* Buffer Structures:
|
|
*
|
|
* Normal memory access uses virtual addresses that can make discontiguous
|
|
* physical memory pages appear to be contiguous in the virtual address
|
|
* space (the processors memory mapping handles the conversions).
|
|
*
|
|
* DMA transfers require physically contiguous memory. This is because
|
|
* the DMA system controller and DMA bus masters deal with memory using
|
|
* only physical addresses.
|
|
*
|
|
* This causes a problem under Windows NT when large DMA buffers are
|
|
* needed. Fragmentation of the nonpaged pool prevents allocations of
|
|
* physically contiguous buffers larger than the PAGE_SIZE.
|
|
*
|
|
* However the 16C32 supports Bus Master Scatter/Gather DMA which
|
|
* allows DMA transfers to physically discontiguous buffers. Information
|
|
* about each data transfer buffer is contained in a memory structure
|
|
* called a 'buffer entry'. A list of buffer entries is maintained
|
|
* to track and control the use of the data transfer buffers.
|
|
*
|
|
* To support this strategy we will allocate sufficient PAGE_SIZE
|
|
* contiguous memory buffers to allow for the total required buffer
|
|
* space.
|
|
*
|
|
* The 16C32 accesses the list of buffer entries using Bus Master
|
|
* DMA. Control information is read from the buffer entries by the
|
|
* 16C32 to control data transfers. status information is written to
|
|
* the buffer entries by the 16C32 to indicate the status of completed
|
|
* transfers.
|
|
*
|
|
* The CPU writes control information to the buffer entries to control
|
|
* the 16C32 and reads status information from the buffer entries to
|
|
* determine information about received and transmitted frames.
|
|
*
|
|
* Because the CPU and 16C32 (adapter) both need simultaneous access
|
|
* to the buffer entries, the buffer entry memory is allocated with
|
|
* HalAllocateCommonBuffer(). This restricts the size of the buffer
|
|
* entry list to PAGE_SIZE.
|
|
*
|
|
* The actual data buffers on the other hand will only be accessed
|
|
* by the CPU or the adapter but not by both simultaneously. This allows
|
|
* Scatter/Gather packet based DMA procedures for using physically
|
|
* discontiguous pages.
|
|
*/
|
|
|
|
/*
|
|
* mgsl_reset_tx_dma_buffers()
|
|
*
|
|
* Set the count for all transmit buffers to 0 to indicate the
|
|
* buffer is available for use and set the current buffer to the
|
|
* first buffer. This effectively makes all buffers free and
|
|
* discards any data in buffers.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
|
|
{
|
|
unsigned int i;
|
|
|
|
for ( i = 0; i < info->tx_buffer_count; i++ ) {
|
|
*((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
|
|
}
|
|
|
|
info->current_tx_buffer = 0;
|
|
info->start_tx_dma_buffer = 0;
|
|
info->tx_dma_buffers_used = 0;
|
|
|
|
info->get_tx_holding_index = 0;
|
|
info->put_tx_holding_index = 0;
|
|
info->tx_holding_count = 0;
|
|
|
|
} /* end of mgsl_reset_tx_dma_buffers() */
|
|
|
|
/*
|
|
* num_free_tx_dma_buffers()
|
|
*
|
|
* returns the number of free tx dma buffers available
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: number of free tx dma buffers
|
|
*/
|
|
static int num_free_tx_dma_buffers(struct mgsl_struct *info)
|
|
{
|
|
return info->tx_buffer_count - info->tx_dma_buffers_used;
|
|
}
|
|
|
|
/*
|
|
* mgsl_reset_rx_dma_buffers()
|
|
*
|
|
* Set the count for all receive buffers to DMABUFFERSIZE
|
|
* and set the current buffer to the first buffer. This effectively
|
|
* makes all buffers free and discards any data in buffers.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
|
|
{
|
|
unsigned int i;
|
|
|
|
for ( i = 0; i < info->rx_buffer_count; i++ ) {
|
|
*((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
|
|
// info->rx_buffer_list[i].count = DMABUFFERSIZE;
|
|
// info->rx_buffer_list[i].status = 0;
|
|
}
|
|
|
|
info->current_rx_buffer = 0;
|
|
|
|
} /* end of mgsl_reset_rx_dma_buffers() */
|
|
|
|
/*
|
|
* mgsl_free_rx_frame_buffers()
|
|
*
|
|
* Free the receive buffers used by a received SDLC
|
|
* frame such that the buffers can be reused.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device instance data
|
|
* StartIndex index of 1st receive buffer of frame
|
|
* EndIndex index of last receive buffer of frame
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
|
|
{
|
|
bool Done = false;
|
|
DMABUFFERENTRY *pBufEntry;
|
|
unsigned int Index;
|
|
|
|
/* Starting with 1st buffer entry of the frame clear the status */
|
|
/* field and set the count field to DMA Buffer Size. */
|
|
|
|
Index = StartIndex;
|
|
|
|
while( !Done ) {
|
|
pBufEntry = &(info->rx_buffer_list[Index]);
|
|
|
|
if ( Index == EndIndex ) {
|
|
/* This is the last buffer of the frame! */
|
|
Done = true;
|
|
}
|
|
|
|
/* reset current buffer for reuse */
|
|
// pBufEntry->status = 0;
|
|
// pBufEntry->count = DMABUFFERSIZE;
|
|
*((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
|
|
|
|
/* advance to next buffer entry in linked list */
|
|
Index++;
|
|
if ( Index == info->rx_buffer_count )
|
|
Index = 0;
|
|
}
|
|
|
|
/* set current buffer to next buffer after last buffer of frame */
|
|
info->current_rx_buffer = Index;
|
|
|
|
} /* end of free_rx_frame_buffers() */
|
|
|
|
/* mgsl_get_rx_frame()
|
|
*
|
|
* This function attempts to return a received SDLC frame from the
|
|
* receive DMA buffers. Only frames received without errors are returned.
|
|
*
|
|
* Arguments: info pointer to device extension
|
|
* Return Value: true if frame returned, otherwise false
|
|
*/
|
|
static bool mgsl_get_rx_frame(struct mgsl_struct *info)
|
|
{
|
|
unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
|
|
unsigned short status;
|
|
DMABUFFERENTRY *pBufEntry;
|
|
unsigned int framesize = 0;
|
|
bool ReturnCode = false;
|
|
unsigned long flags;
|
|
struct tty_struct *tty = info->port.tty;
|
|
bool return_frame = false;
|
|
|
|
/*
|
|
* current_rx_buffer points to the 1st buffer of the next available
|
|
* receive frame. To find the last buffer of the frame look for
|
|
* a non-zero status field in the buffer entries. (The status
|
|
* field is set by the 16C32 after completing a receive frame.
|
|
*/
|
|
|
|
StartIndex = EndIndex = info->current_rx_buffer;
|
|
|
|
while( !info->rx_buffer_list[EndIndex].status ) {
|
|
/*
|
|
* If the count field of the buffer entry is non-zero then
|
|
* this buffer has not been used. (The 16C32 clears the count
|
|
* field when it starts using the buffer.) If an unused buffer
|
|
* is encountered then there are no frames available.
|
|
*/
|
|
|
|
if ( info->rx_buffer_list[EndIndex].count )
|
|
goto Cleanup;
|
|
|
|
/* advance to next buffer entry in linked list */
|
|
EndIndex++;
|
|
if ( EndIndex == info->rx_buffer_count )
|
|
EndIndex = 0;
|
|
|
|
/* if entire list searched then no frame available */
|
|
if ( EndIndex == StartIndex ) {
|
|
/* If this occurs then something bad happened,
|
|
* all buffers have been 'used' but none mark
|
|
* the end of a frame. Reset buffers and receiver.
|
|
*/
|
|
|
|
if ( info->rx_enabled ){
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_start_receiver(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
goto Cleanup;
|
|
}
|
|
}
|
|
|
|
|
|
/* check status of receive frame */
|
|
|
|
status = info->rx_buffer_list[EndIndex].status;
|
|
|
|
if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
|
|
RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
|
|
if ( status & RXSTATUS_SHORT_FRAME )
|
|
info->icount.rxshort++;
|
|
else if ( status & RXSTATUS_ABORT )
|
|
info->icount.rxabort++;
|
|
else if ( status & RXSTATUS_OVERRUN )
|
|
info->icount.rxover++;
|
|
else {
|
|
info->icount.rxcrc++;
|
|
if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
|
|
return_frame = true;
|
|
}
|
|
framesize = 0;
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
{
|
|
info->netdev->stats.rx_errors++;
|
|
info->netdev->stats.rx_frame_errors++;
|
|
}
|
|
#endif
|
|
} else
|
|
return_frame = true;
|
|
|
|
if ( return_frame ) {
|
|
/* receive frame has no errors, get frame size.
|
|
* The frame size is the starting value of the RCC (which was
|
|
* set to 0xffff) minus the ending value of the RCC (decremented
|
|
* once for each receive character) minus 2 for the 16-bit CRC.
|
|
*/
|
|
|
|
framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
|
|
|
|
/* adjust frame size for CRC if any */
|
|
if ( info->params.crc_type == HDLC_CRC_16_CCITT )
|
|
framesize -= 2;
|
|
else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
|
|
framesize -= 4;
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
|
|
__FILE__,__LINE__,info->device_name,status,framesize);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_DATA )
|
|
mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
|
|
min_t(int, framesize, DMABUFFERSIZE),0);
|
|
|
|
if (framesize) {
|
|
if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
|
|
((framesize+1) > info->max_frame_size) ) ||
|
|
(framesize > info->max_frame_size) )
|
|
info->icount.rxlong++;
|
|
else {
|
|
/* copy dma buffer(s) to contiguous intermediate buffer */
|
|
int copy_count = framesize;
|
|
int index = StartIndex;
|
|
unsigned char *ptmp = info->intermediate_rxbuffer;
|
|
|
|
if ( !(status & RXSTATUS_CRC_ERROR))
|
|
info->icount.rxok++;
|
|
|
|
while(copy_count) {
|
|
int partial_count;
|
|
if ( copy_count > DMABUFFERSIZE )
|
|
partial_count = DMABUFFERSIZE;
|
|
else
|
|
partial_count = copy_count;
|
|
|
|
pBufEntry = &(info->rx_buffer_list[index]);
|
|
memcpy( ptmp, pBufEntry->virt_addr, partial_count );
|
|
ptmp += partial_count;
|
|
copy_count -= partial_count;
|
|
|
|
if ( ++index == info->rx_buffer_count )
|
|
index = 0;
|
|
}
|
|
|
|
if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
|
|
++framesize;
|
|
*ptmp = (status & RXSTATUS_CRC_ERROR ?
|
|
RX_CRC_ERROR :
|
|
RX_OK);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_DATA )
|
|
printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
|
|
__FILE__,__LINE__,info->device_name,
|
|
*ptmp);
|
|
}
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
if (info->netcount)
|
|
hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
|
|
else
|
|
#endif
|
|
ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
|
|
}
|
|
}
|
|
/* Free the buffers used by this frame. */
|
|
mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
|
|
|
|
ReturnCode = true;
|
|
|
|
Cleanup:
|
|
|
|
if ( info->rx_enabled && info->rx_overflow ) {
|
|
/* The receiver needs to restarted because of
|
|
* a receive overflow (buffer or FIFO). If the
|
|
* receive buffers are now empty, then restart receiver.
|
|
*/
|
|
|
|
if ( !info->rx_buffer_list[EndIndex].status &&
|
|
info->rx_buffer_list[EndIndex].count ) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_start_receiver(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
}
|
|
|
|
return ReturnCode;
|
|
|
|
} /* end of mgsl_get_rx_frame() */
|
|
|
|
/* mgsl_get_raw_rx_frame()
|
|
*
|
|
* This function attempts to return a received frame from the
|
|
* receive DMA buffers when running in external loop mode. In this mode,
|
|
* we will return at most one DMABUFFERSIZE frame to the application.
|
|
* The USC receiver is triggering off of DCD going active to start a new
|
|
* frame, and DCD going inactive to terminate the frame (similar to
|
|
* processing a closing flag character).
|
|
*
|
|
* In this routine, we will return DMABUFFERSIZE "chunks" at a time.
|
|
* If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
|
|
* status field and the RCC field will indicate the length of the
|
|
* entire received frame. We take this RCC field and get the modulus
|
|
* of RCC and DMABUFFERSIZE to determine if number of bytes in the
|
|
* last Rx DMA buffer and return that last portion of the frame.
|
|
*
|
|
* Arguments: info pointer to device extension
|
|
* Return Value: true if frame returned, otherwise false
|
|
*/
|
|
static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
|
|
{
|
|
unsigned int CurrentIndex, NextIndex;
|
|
unsigned short status;
|
|
DMABUFFERENTRY *pBufEntry;
|
|
unsigned int framesize = 0;
|
|
bool ReturnCode = false;
|
|
unsigned long flags;
|
|
struct tty_struct *tty = info->port.tty;
|
|
|
|
/*
|
|
* current_rx_buffer points to the 1st buffer of the next available
|
|
* receive frame. The status field is set by the 16C32 after
|
|
* completing a receive frame. If the status field of this buffer
|
|
* is zero, either the USC is still filling this buffer or this
|
|
* is one of a series of buffers making up a received frame.
|
|
*
|
|
* If the count field of this buffer is zero, the USC is either
|
|
* using this buffer or has used this buffer. Look at the count
|
|
* field of the next buffer. If that next buffer's count is
|
|
* non-zero, the USC is still actively using the current buffer.
|
|
* Otherwise, if the next buffer's count field is zero, the
|
|
* current buffer is complete and the USC is using the next
|
|
* buffer.
|
|
*/
|
|
CurrentIndex = NextIndex = info->current_rx_buffer;
|
|
++NextIndex;
|
|
if ( NextIndex == info->rx_buffer_count )
|
|
NextIndex = 0;
|
|
|
|
if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
|
|
(info->rx_buffer_list[CurrentIndex].count == 0 &&
|
|
info->rx_buffer_list[NextIndex].count == 0)) {
|
|
/*
|
|
* Either the status field of this dma buffer is non-zero
|
|
* (indicating the last buffer of a receive frame) or the next
|
|
* buffer is marked as in use -- implying this buffer is complete
|
|
* and an intermediate buffer for this received frame.
|
|
*/
|
|
|
|
status = info->rx_buffer_list[CurrentIndex].status;
|
|
|
|
if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
|
|
RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
|
|
if ( status & RXSTATUS_SHORT_FRAME )
|
|
info->icount.rxshort++;
|
|
else if ( status & RXSTATUS_ABORT )
|
|
info->icount.rxabort++;
|
|
else if ( status & RXSTATUS_OVERRUN )
|
|
info->icount.rxover++;
|
|
else
|
|
info->icount.rxcrc++;
|
|
framesize = 0;
|
|
} else {
|
|
/*
|
|
* A receive frame is available, get frame size and status.
|
|
*
|
|
* The frame size is the starting value of the RCC (which was
|
|
* set to 0xffff) minus the ending value of the RCC (decremented
|
|
* once for each receive character) minus 2 or 4 for the 16-bit
|
|
* or 32-bit CRC.
|
|
*
|
|
* If the status field is zero, this is an intermediate buffer.
|
|
* It's size is 4K.
|
|
*
|
|
* If the DMA Buffer Entry's Status field is non-zero, the
|
|
* receive operation completed normally (ie: DCD dropped). The
|
|
* RCC field is valid and holds the received frame size.
|
|
* It is possible that the RCC field will be zero on a DMA buffer
|
|
* entry with a non-zero status. This can occur if the total
|
|
* frame size (number of bytes between the time DCD goes active
|
|
* to the time DCD goes inactive) exceeds 65535 bytes. In this
|
|
* case the 16C32 has underrun on the RCC count and appears to
|
|
* stop updating this counter to let us know the actual received
|
|
* frame size. If this happens (non-zero status and zero RCC),
|
|
* simply return the entire RxDMA Buffer
|
|
*/
|
|
if ( status ) {
|
|
/*
|
|
* In the event that the final RxDMA Buffer is
|
|
* terminated with a non-zero status and the RCC
|
|
* field is zero, we interpret this as the RCC
|
|
* having underflowed (received frame > 65535 bytes).
|
|
*
|
|
* Signal the event to the user by passing back
|
|
* a status of RxStatus_CrcError returning the full
|
|
* buffer and let the app figure out what data is
|
|
* actually valid
|
|
*/
|
|
if ( info->rx_buffer_list[CurrentIndex].rcc )
|
|
framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
|
|
else
|
|
framesize = DMABUFFERSIZE;
|
|
}
|
|
else
|
|
framesize = DMABUFFERSIZE;
|
|
}
|
|
|
|
if ( framesize > DMABUFFERSIZE ) {
|
|
/*
|
|
* if running in raw sync mode, ISR handler for
|
|
* End Of Buffer events terminates all buffers at 4K.
|
|
* If this frame size is said to be >4K, get the
|
|
* actual number of bytes of the frame in this buffer.
|
|
*/
|
|
framesize = framesize % DMABUFFERSIZE;
|
|
}
|
|
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_BH )
|
|
printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
|
|
__FILE__,__LINE__,info->device_name,status,framesize);
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_DATA )
|
|
mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
|
|
min_t(int, framesize, DMABUFFERSIZE),0);
|
|
|
|
if (framesize) {
|
|
/* copy dma buffer(s) to contiguous intermediate buffer */
|
|
/* NOTE: we never copy more than DMABUFFERSIZE bytes */
|
|
|
|
pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
|
|
memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
|
|
info->icount.rxok++;
|
|
|
|
ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
|
|
}
|
|
|
|
/* Free the buffers used by this frame. */
|
|
mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
|
|
|
|
ReturnCode = true;
|
|
}
|
|
|
|
|
|
if ( info->rx_enabled && info->rx_overflow ) {
|
|
/* The receiver needs to restarted because of
|
|
* a receive overflow (buffer or FIFO). If the
|
|
* receive buffers are now empty, then restart receiver.
|
|
*/
|
|
|
|
if ( !info->rx_buffer_list[CurrentIndex].status &&
|
|
info->rx_buffer_list[CurrentIndex].count ) {
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_start_receiver(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
}
|
|
|
|
return ReturnCode;
|
|
|
|
} /* end of mgsl_get_raw_rx_frame() */
|
|
|
|
/* mgsl_load_tx_dma_buffer()
|
|
*
|
|
* Load the transmit DMA buffer with the specified data.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* info pointer to device extension
|
|
* Buffer pointer to buffer containing frame to load
|
|
* BufferSize size in bytes of frame in Buffer
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
|
|
const char *Buffer, unsigned int BufferSize)
|
|
{
|
|
unsigned short Copycount;
|
|
unsigned int i = 0;
|
|
DMABUFFERENTRY *pBufEntry;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_DATA )
|
|
mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
|
|
|
|
if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
|
|
/* set CMR:13 to start transmit when
|
|
* next GoAhead (abort) is received
|
|
*/
|
|
info->cmr_value |= BIT13;
|
|
}
|
|
|
|
/* begin loading the frame in the next available tx dma
|
|
* buffer, remember it's starting location for setting
|
|
* up tx dma operation
|
|
*/
|
|
i = info->current_tx_buffer;
|
|
info->start_tx_dma_buffer = i;
|
|
|
|
/* Setup the status and RCC (Frame Size) fields of the 1st */
|
|
/* buffer entry in the transmit DMA buffer list. */
|
|
|
|
info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
|
|
info->tx_buffer_list[i].rcc = BufferSize;
|
|
info->tx_buffer_list[i].count = BufferSize;
|
|
|
|
/* Copy frame data from 1st source buffer to the DMA buffers. */
|
|
/* The frame data may span multiple DMA buffers. */
|
|
|
|
while( BufferSize ){
|
|
/* Get a pointer to next DMA buffer entry. */
|
|
pBufEntry = &info->tx_buffer_list[i++];
|
|
|
|
if ( i == info->tx_buffer_count )
|
|
i=0;
|
|
|
|
/* Calculate the number of bytes that can be copied from */
|
|
/* the source buffer to this DMA buffer. */
|
|
if ( BufferSize > DMABUFFERSIZE )
|
|
Copycount = DMABUFFERSIZE;
|
|
else
|
|
Copycount = BufferSize;
|
|
|
|
/* Actually copy data from source buffer to DMA buffer. */
|
|
/* Also set the data count for this individual DMA buffer. */
|
|
if ( info->bus_type == MGSL_BUS_TYPE_PCI )
|
|
mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
|
|
else
|
|
memcpy(pBufEntry->virt_addr, Buffer, Copycount);
|
|
|
|
pBufEntry->count = Copycount;
|
|
|
|
/* Advance source pointer and reduce remaining data count. */
|
|
Buffer += Copycount;
|
|
BufferSize -= Copycount;
|
|
|
|
++info->tx_dma_buffers_used;
|
|
}
|
|
|
|
/* remember next available tx dma buffer */
|
|
info->current_tx_buffer = i;
|
|
|
|
} /* end of mgsl_load_tx_dma_buffer() */
|
|
|
|
/*
|
|
* mgsl_register_test()
|
|
*
|
|
* Performs a register test of the 16C32.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: true if test passed, otherwise false
|
|
*/
|
|
static bool mgsl_register_test( struct mgsl_struct *info )
|
|
{
|
|
static unsigned short BitPatterns[] =
|
|
{ 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
|
|
static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
|
|
unsigned int i;
|
|
bool rc = true;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_reset(info);
|
|
|
|
/* Verify the reset state of some registers. */
|
|
|
|
if ( (usc_InReg( info, SICR ) != 0) ||
|
|
(usc_InReg( info, IVR ) != 0) ||
|
|
(usc_InDmaReg( info, DIVR ) != 0) ){
|
|
rc = false;
|
|
}
|
|
|
|
if ( rc ){
|
|
/* Write bit patterns to various registers but do it out of */
|
|
/* sync, then read back and verify values. */
|
|
|
|
for ( i = 0 ; i < Patterncount ; i++ ) {
|
|
usc_OutReg( info, TC0R, BitPatterns[i] );
|
|
usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
|
|
usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
|
|
usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
|
|
usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
|
|
usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
|
|
|
|
if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
|
|
(usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
|
|
(usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
|
|
(usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
|
|
(usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
|
|
(usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
|
|
rc = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
usc_reset(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return rc;
|
|
|
|
} /* end of mgsl_register_test() */
|
|
|
|
/* mgsl_irq_test() Perform interrupt test of the 16C32.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: true if test passed, otherwise false
|
|
*/
|
|
static bool mgsl_irq_test( struct mgsl_struct *info )
|
|
{
|
|
unsigned long EndTime;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_reset(info);
|
|
|
|
/*
|
|
* Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
|
|
* The ISR sets irq_occurred to true.
|
|
*/
|
|
|
|
info->irq_occurred = false;
|
|
|
|
/* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
|
|
/* Enable INTEN (Port 6, Bit12) */
|
|
/* This connects the IRQ request signal to the ISA bus */
|
|
/* on the ISA adapter. This has no effect for the PCI adapter */
|
|
usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
|
|
|
|
usc_EnableMasterIrqBit(info);
|
|
usc_EnableInterrupts(info, IO_PIN);
|
|
usc_ClearIrqPendingBits(info, IO_PIN);
|
|
|
|
usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
|
|
usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
EndTime=100;
|
|
while( EndTime-- && !info->irq_occurred ) {
|
|
msleep_interruptible(10);
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_reset(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return info->irq_occurred;
|
|
|
|
} /* end of mgsl_irq_test() */
|
|
|
|
/* mgsl_dma_test()
|
|
*
|
|
* Perform a DMA test of the 16C32. A small frame is
|
|
* transmitted via DMA from a transmit buffer to a receive buffer
|
|
* using single buffer DMA mode.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: true if test passed, otherwise false
|
|
*/
|
|
static bool mgsl_dma_test( struct mgsl_struct *info )
|
|
{
|
|
unsigned short FifoLevel;
|
|
unsigned long phys_addr;
|
|
unsigned int FrameSize;
|
|
unsigned int i;
|
|
char *TmpPtr;
|
|
bool rc = true;
|
|
unsigned short status=0;
|
|
unsigned long EndTime;
|
|
unsigned long flags;
|
|
MGSL_PARAMS tmp_params;
|
|
|
|
/* save current port options */
|
|
memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
|
|
/* load default port options */
|
|
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
|
|
|
|
#define TESTFRAMESIZE 40
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
/* setup 16C32 for SDLC DMA transfer mode */
|
|
|
|
usc_reset(info);
|
|
usc_set_sdlc_mode(info);
|
|
usc_enable_loopback(info,1);
|
|
|
|
/* Reprogram the RDMR so that the 16C32 does NOT clear the count
|
|
* field of the buffer entry after fetching buffer address. This
|
|
* way we can detect a DMA failure for a DMA read (which should be
|
|
* non-destructive to system memory) before we try and write to
|
|
* memory (where a failure could corrupt system memory).
|
|
*/
|
|
|
|
/* Receive DMA mode Register (RDMR)
|
|
*
|
|
* <15..14> 11 DMA mode = Linked List Buffer mode
|
|
* <13> 1 RSBinA/L = store Rx status Block in List entry
|
|
* <12> 0 1 = Clear count of List Entry after fetching
|
|
* <11..10> 00 Address mode = Increment
|
|
* <9> 1 Terminate Buffer on RxBound
|
|
* <8> 0 Bus Width = 16bits
|
|
* <7..0> ? status Bits (write as 0s)
|
|
*
|
|
* 1110 0010 0000 0000 = 0xe200
|
|
*/
|
|
|
|
usc_OutDmaReg( info, RDMR, 0xe200 );
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
|
|
/* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
|
|
|
|
FrameSize = TESTFRAMESIZE;
|
|
|
|
/* setup 1st transmit buffer entry: */
|
|
/* with frame size and transmit control word */
|
|
|
|
info->tx_buffer_list[0].count = FrameSize;
|
|
info->tx_buffer_list[0].rcc = FrameSize;
|
|
info->tx_buffer_list[0].status = 0x4000;
|
|
|
|
/* build a transmit frame in 1st transmit DMA buffer */
|
|
|
|
TmpPtr = info->tx_buffer_list[0].virt_addr;
|
|
for (i = 0; i < FrameSize; i++ )
|
|
*TmpPtr++ = i;
|
|
|
|
/* setup 1st receive buffer entry: */
|
|
/* clear status, set max receive buffer size */
|
|
|
|
info->rx_buffer_list[0].status = 0;
|
|
info->rx_buffer_list[0].count = FrameSize + 4;
|
|
|
|
/* zero out the 1st receive buffer */
|
|
|
|
memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
|
|
|
|
/* Set count field of next buffer entries to prevent */
|
|
/* 16C32 from using buffers after the 1st one. */
|
|
|
|
info->tx_buffer_list[1].count = 0;
|
|
info->rx_buffer_list[1].count = 0;
|
|
|
|
|
|
/***************************/
|
|
/* Program 16C32 receiver. */
|
|
/***************************/
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
/* setup DMA transfers */
|
|
usc_RTCmd( info, RTCmd_PurgeRxFifo );
|
|
|
|
/* program 16C32 receiver with physical address of 1st DMA buffer entry */
|
|
phys_addr = info->rx_buffer_list[0].phys_entry;
|
|
usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
|
|
usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
|
|
|
|
/* Clear the Rx DMA status bits (read RDMR) and start channel */
|
|
usc_InDmaReg( info, RDMR );
|
|
usc_DmaCmd( info, DmaCmd_InitRxChannel );
|
|
|
|
/* Enable Receiver (RMR <1..0> = 10) */
|
|
usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
|
|
/*************************************************************/
|
|
/* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
|
|
/*************************************************************/
|
|
|
|
/* Wait 100ms for interrupt. */
|
|
EndTime = jiffies + msecs_to_jiffies(100);
|
|
|
|
for(;;) {
|
|
if (time_after(jiffies, EndTime)) {
|
|
rc = false;
|
|
break;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
status = usc_InDmaReg( info, RDMR );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
if ( !(status & BIT4) && (status & BIT5) ) {
|
|
/* INITG (BIT 4) is inactive (no entry read in progress) AND */
|
|
/* BUSY (BIT 5) is active (channel still active). */
|
|
/* This means the buffer entry read has completed. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/******************************/
|
|
/* Program 16C32 transmitter. */
|
|
/******************************/
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
/* Program the Transmit Character Length Register (TCLR) */
|
|
/* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
|
|
|
|
usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
|
|
/* Program the address of the 1st DMA Buffer Entry in linked list */
|
|
|
|
phys_addr = info->tx_buffer_list[0].phys_entry;
|
|
usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
|
|
usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
|
|
|
|
/* unlatch Tx status bits, and start transmit channel. */
|
|
|
|
usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
|
|
usc_DmaCmd( info, DmaCmd_InitTxChannel );
|
|
|
|
/* wait for DMA controller to fill transmit FIFO */
|
|
|
|
usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
|
|
/**********************************/
|
|
/* WAIT FOR TRANSMIT FIFO TO FILL */
|
|
/**********************************/
|
|
|
|
/* Wait 100ms */
|
|
EndTime = jiffies + msecs_to_jiffies(100);
|
|
|
|
for(;;) {
|
|
if (time_after(jiffies, EndTime)) {
|
|
rc = false;
|
|
break;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
FifoLevel = usc_InReg(info, TICR) >> 8;
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
if ( FifoLevel < 16 )
|
|
break;
|
|
else
|
|
if ( FrameSize < 32 ) {
|
|
/* This frame is smaller than the entire transmit FIFO */
|
|
/* so wait for the entire frame to be loaded. */
|
|
if ( FifoLevel <= (32 - FrameSize) )
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
if ( rc )
|
|
{
|
|
/* Enable 16C32 transmitter. */
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
|
|
/* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
|
|
usc_TCmd( info, TCmd_SendFrame );
|
|
usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
|
|
/******************************/
|
|
/* WAIT FOR TRANSMIT COMPLETE */
|
|
/******************************/
|
|
|
|
/* Wait 100ms */
|
|
EndTime = jiffies + msecs_to_jiffies(100);
|
|
|
|
/* While timer not expired wait for transmit complete */
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
status = usc_InReg( info, TCSR );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
|
|
if (time_after(jiffies, EndTime)) {
|
|
rc = false;
|
|
break;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
status = usc_InReg( info, TCSR );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
}
|
|
}
|
|
|
|
|
|
if ( rc ){
|
|
/* CHECK FOR TRANSMIT ERRORS */
|
|
if ( status & (BIT5 + BIT1) )
|
|
rc = false;
|
|
}
|
|
|
|
if ( rc ) {
|
|
/* WAIT FOR RECEIVE COMPLETE */
|
|
|
|
/* Wait 100ms */
|
|
EndTime = jiffies + msecs_to_jiffies(100);
|
|
|
|
/* Wait for 16C32 to write receive status to buffer entry. */
|
|
status=info->rx_buffer_list[0].status;
|
|
while ( status == 0 ) {
|
|
if (time_after(jiffies, EndTime)) {
|
|
rc = false;
|
|
break;
|
|
}
|
|
status=info->rx_buffer_list[0].status;
|
|
}
|
|
}
|
|
|
|
|
|
if ( rc ) {
|
|
/* CHECK FOR RECEIVE ERRORS */
|
|
status = info->rx_buffer_list[0].status;
|
|
|
|
if ( status & (BIT8 + BIT3 + BIT1) ) {
|
|
/* receive error has occurred */
|
|
rc = false;
|
|
} else {
|
|
if ( memcmp( info->tx_buffer_list[0].virt_addr ,
|
|
info->rx_buffer_list[0].virt_addr, FrameSize ) ){
|
|
rc = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_reset( info );
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
/* restore current port options */
|
|
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
|
|
|
|
return rc;
|
|
|
|
} /* end of mgsl_dma_test() */
|
|
|
|
/* mgsl_adapter_test()
|
|
*
|
|
* Perform the register, IRQ, and DMA tests for the 16C32.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: 0 if success, otherwise -ENODEV
|
|
*/
|
|
static int mgsl_adapter_test( struct mgsl_struct *info )
|
|
{
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):Testing device %s\n",
|
|
__FILE__,__LINE__,info->device_name );
|
|
|
|
if ( !mgsl_register_test( info ) ) {
|
|
info->init_error = DiagStatus_AddressFailure;
|
|
printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
|
|
__FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
|
|
return -ENODEV;
|
|
}
|
|
|
|
if ( !mgsl_irq_test( info ) ) {
|
|
info->init_error = DiagStatus_IrqFailure;
|
|
printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
|
|
__FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
|
|
return -ENODEV;
|
|
}
|
|
|
|
if ( !mgsl_dma_test( info ) ) {
|
|
info->init_error = DiagStatus_DmaFailure;
|
|
printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
|
|
__FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
|
|
return -ENODEV;
|
|
}
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):device %s passed diagnostics\n",
|
|
__FILE__,__LINE__,info->device_name );
|
|
|
|
return 0;
|
|
|
|
} /* end of mgsl_adapter_test() */
|
|
|
|
/* mgsl_memory_test()
|
|
*
|
|
* Test the shared memory on a PCI adapter.
|
|
*
|
|
* Arguments: info pointer to device instance data
|
|
* Return Value: true if test passed, otherwise false
|
|
*/
|
|
static bool mgsl_memory_test( struct mgsl_struct *info )
|
|
{
|
|
static unsigned long BitPatterns[] =
|
|
{ 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
|
|
unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
|
|
unsigned long i;
|
|
unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
|
|
unsigned long * TestAddr;
|
|
|
|
if ( info->bus_type != MGSL_BUS_TYPE_PCI )
|
|
return true;
|
|
|
|
TestAddr = (unsigned long *)info->memory_base;
|
|
|
|
/* Test data lines with test pattern at one location. */
|
|
|
|
for ( i = 0 ; i < Patterncount ; i++ ) {
|
|
*TestAddr = BitPatterns[i];
|
|
if ( *TestAddr != BitPatterns[i] )
|
|
return false;
|
|
}
|
|
|
|
/* Test address lines with incrementing pattern over */
|
|
/* entire address range. */
|
|
|
|
for ( i = 0 ; i < TestLimit ; i++ ) {
|
|
*TestAddr = i * 4;
|
|
TestAddr++;
|
|
}
|
|
|
|
TestAddr = (unsigned long *)info->memory_base;
|
|
|
|
for ( i = 0 ; i < TestLimit ; i++ ) {
|
|
if ( *TestAddr != i * 4 )
|
|
return false;
|
|
TestAddr++;
|
|
}
|
|
|
|
memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
|
|
|
|
return true;
|
|
|
|
} /* End Of mgsl_memory_test() */
|
|
|
|
|
|
/* mgsl_load_pci_memory()
|
|
*
|
|
* Load a large block of data into the PCI shared memory.
|
|
* Use this instead of memcpy() or memmove() to move data
|
|
* into the PCI shared memory.
|
|
*
|
|
* Notes:
|
|
*
|
|
* This function prevents the PCI9050 interface chip from hogging
|
|
* the adapter local bus, which can starve the 16C32 by preventing
|
|
* 16C32 bus master cycles.
|
|
*
|
|
* The PCI9050 documentation says that the 9050 will always release
|
|
* control of the local bus after completing the current read
|
|
* or write operation.
|
|
*
|
|
* It appears that as long as the PCI9050 write FIFO is full, the
|
|
* PCI9050 treats all of the writes as a single burst transaction
|
|
* and will not release the bus. This causes DMA latency problems
|
|
* at high speeds when copying large data blocks to the shared
|
|
* memory.
|
|
*
|
|
* This function in effect, breaks the a large shared memory write
|
|
* into multiple transations by interleaving a shared memory read
|
|
* which will flush the write FIFO and 'complete' the write
|
|
* transation. This allows any pending DMA request to gain control
|
|
* of the local bus in a timely fasion.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* TargetPtr pointer to target address in PCI shared memory
|
|
* SourcePtr pointer to source buffer for data
|
|
* count count in bytes of data to copy
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
|
|
unsigned short count )
|
|
{
|
|
/* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
|
|
#define PCI_LOAD_INTERVAL 64
|
|
|
|
unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
|
|
unsigned short Index;
|
|
unsigned long Dummy;
|
|
|
|
for ( Index = 0 ; Index < Intervalcount ; Index++ )
|
|
{
|
|
memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
|
|
Dummy = *((volatile unsigned long *)TargetPtr);
|
|
TargetPtr += PCI_LOAD_INTERVAL;
|
|
SourcePtr += PCI_LOAD_INTERVAL;
|
|
}
|
|
|
|
memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
|
|
|
|
} /* End Of mgsl_load_pci_memory() */
|
|
|
|
static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
|
|
{
|
|
int i;
|
|
int linecount;
|
|
if (xmit)
|
|
printk("%s tx data:\n",info->device_name);
|
|
else
|
|
printk("%s rx data:\n",info->device_name);
|
|
|
|
while(count) {
|
|
if (count > 16)
|
|
linecount = 16;
|
|
else
|
|
linecount = count;
|
|
|
|
for(i=0;i<linecount;i++)
|
|
printk("%02X ",(unsigned char)data[i]);
|
|
for(;i<17;i++)
|
|
printk(" ");
|
|
for(i=0;i<linecount;i++) {
|
|
if (data[i]>=040 && data[i]<=0176)
|
|
printk("%c",data[i]);
|
|
else
|
|
printk(".");
|
|
}
|
|
printk("\n");
|
|
|
|
data += linecount;
|
|
count -= linecount;
|
|
}
|
|
} /* end of mgsl_trace_block() */
|
|
|
|
/* mgsl_tx_timeout()
|
|
*
|
|
* called when HDLC frame times out
|
|
* update stats and do tx completion processing
|
|
*
|
|
* Arguments: context pointer to device instance data
|
|
* Return Value: None
|
|
*/
|
|
static void mgsl_tx_timeout(unsigned long context)
|
|
{
|
|
struct mgsl_struct *info = (struct mgsl_struct*)context;
|
|
unsigned long flags;
|
|
|
|
if ( debug_level >= DEBUG_LEVEL_INFO )
|
|
printk( "%s(%d):mgsl_tx_timeout(%s)\n",
|
|
__FILE__,__LINE__,info->device_name);
|
|
if(info->tx_active &&
|
|
(info->params.mode == MGSL_MODE_HDLC ||
|
|
info->params.mode == MGSL_MODE_RAW) ) {
|
|
info->icount.txtimeout++;
|
|
}
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
info->tx_active = false;
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
|
|
usc_loopmode_cancel_transmit( info );
|
|
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
if (info->netcount)
|
|
hdlcdev_tx_done(info);
|
|
else
|
|
#endif
|
|
mgsl_bh_transmit(info);
|
|
|
|
} /* end of mgsl_tx_timeout() */
|
|
|
|
/* signal that there are no more frames to send, so that
|
|
* line is 'released' by echoing RxD to TxD when current
|
|
* transmission is complete (or immediately if no tx in progress).
|
|
*/
|
|
static int mgsl_loopmode_send_done( struct mgsl_struct * info )
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
|
|
if (info->tx_active)
|
|
info->loopmode_send_done_requested = true;
|
|
else
|
|
usc_loopmode_send_done(info);
|
|
}
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* release the line by echoing RxD to TxD
|
|
* upon completion of a transmit frame
|
|
*/
|
|
static void usc_loopmode_send_done( struct mgsl_struct * info )
|
|
{
|
|
info->loopmode_send_done_requested = false;
|
|
/* clear CMR:13 to 0 to start echoing RxData to TxData */
|
|
info->cmr_value &= ~BIT13;
|
|
usc_OutReg(info, CMR, info->cmr_value);
|
|
}
|
|
|
|
/* abort a transmit in progress while in HDLC LoopMode
|
|
*/
|
|
static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
|
|
{
|
|
/* reset tx dma channel and purge TxFifo */
|
|
usc_RTCmd( info, RTCmd_PurgeTxFifo );
|
|
usc_DmaCmd( info, DmaCmd_ResetTxChannel );
|
|
usc_loopmode_send_done( info );
|
|
}
|
|
|
|
/* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
|
|
* is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
|
|
* we must clear CMR:13 to begin repeating TxData to RxData
|
|
*/
|
|
static void usc_loopmode_insert_request( struct mgsl_struct * info )
|
|
{
|
|
info->loopmode_insert_requested = true;
|
|
|
|
/* enable RxAbort irq. On next RxAbort, clear CMR:13 to
|
|
* begin repeating TxData on RxData (complete insertion)
|
|
*/
|
|
usc_OutReg( info, RICR,
|
|
(usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
|
|
|
|
/* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
|
|
info->cmr_value |= BIT13;
|
|
usc_OutReg(info, CMR, info->cmr_value);
|
|
}
|
|
|
|
/* return 1 if station is inserted into the loop, otherwise 0
|
|
*/
|
|
static int usc_loopmode_active( struct mgsl_struct * info)
|
|
{
|
|
return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
|
|
}
|
|
|
|
#if SYNCLINK_GENERIC_HDLC
|
|
|
|
/**
|
|
* called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
|
|
* set encoding and frame check sequence (FCS) options
|
|
*
|
|
* dev pointer to network device structure
|
|
* encoding serial encoding setting
|
|
* parity FCS setting
|
|
*
|
|
* returns 0 if success, otherwise error code
|
|
*/
|
|
static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
|
|
unsigned short parity)
|
|
{
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
unsigned char new_encoding;
|
|
unsigned short new_crctype;
|
|
|
|
/* return error if TTY interface open */
|
|
if (info->port.count)
|
|
return -EBUSY;
|
|
|
|
switch (encoding)
|
|
{
|
|
case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
|
|
case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
|
|
case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
|
|
case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
|
|
case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
|
|
default: return -EINVAL;
|
|
}
|
|
|
|
switch (parity)
|
|
{
|
|
case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
|
|
case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
|
|
case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
|
|
default: return -EINVAL;
|
|
}
|
|
|
|
info->params.encoding = new_encoding;
|
|
info->params.crc_type = new_crctype;
|
|
|
|
/* if network interface up, reprogram hardware */
|
|
if (info->netcount)
|
|
mgsl_program_hw(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* called by generic HDLC layer to send frame
|
|
*
|
|
* skb socket buffer containing HDLC frame
|
|
* dev pointer to network device structure
|
|
*/
|
|
static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
|
|
|
|
/* stop sending until this frame completes */
|
|
netif_stop_queue(dev);
|
|
|
|
/* copy data to device buffers */
|
|
info->xmit_cnt = skb->len;
|
|
mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
|
|
|
|
/* update network statistics */
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
/* done with socket buffer, so free it */
|
|
dev_kfree_skb(skb);
|
|
|
|
/* save start time for transmit timeout detection */
|
|
dev->trans_start = jiffies;
|
|
|
|
/* start hardware transmitter if necessary */
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
if (!info->tx_active)
|
|
usc_start_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/**
|
|
* called by network layer when interface enabled
|
|
* claim resources and initialize hardware
|
|
*
|
|
* dev pointer to network device structure
|
|
*
|
|
* returns 0 if success, otherwise error code
|
|
*/
|
|
static int hdlcdev_open(struct net_device *dev)
|
|
{
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
int rc;
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
|
|
|
|
/* generic HDLC layer open processing */
|
|
if ((rc = hdlc_open(dev)))
|
|
return rc;
|
|
|
|
/* arbitrate between network and tty opens */
|
|
spin_lock_irqsave(&info->netlock, flags);
|
|
if (info->port.count != 0 || info->netcount != 0) {
|
|
printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
return -EBUSY;
|
|
}
|
|
info->netcount=1;
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
|
|
/* claim resources and init adapter */
|
|
if ((rc = startup(info)) != 0) {
|
|
spin_lock_irqsave(&info->netlock, flags);
|
|
info->netcount=0;
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/* assert DTR and RTS, apply hardware settings */
|
|
info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
|
|
mgsl_program_hw(info);
|
|
|
|
/* enable network layer transmit */
|
|
dev->trans_start = jiffies;
|
|
netif_start_queue(dev);
|
|
|
|
/* inform generic HDLC layer of current DCD status */
|
|
spin_lock_irqsave(&info->irq_spinlock, flags);
|
|
usc_get_serial_signals(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock, flags);
|
|
if (info->serial_signals & SerialSignal_DCD)
|
|
netif_carrier_on(dev);
|
|
else
|
|
netif_carrier_off(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* called by network layer when interface is disabled
|
|
* shutdown hardware and release resources
|
|
*
|
|
* dev pointer to network device structure
|
|
*
|
|
* returns 0 if success, otherwise error code
|
|
*/
|
|
static int hdlcdev_close(struct net_device *dev)
|
|
{
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
/* shutdown adapter and release resources */
|
|
shutdown(info);
|
|
|
|
hdlc_close(dev);
|
|
|
|
spin_lock_irqsave(&info->netlock, flags);
|
|
info->netcount=0;
|
|
spin_unlock_irqrestore(&info->netlock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* called by network layer to process IOCTL call to network device
|
|
*
|
|
* dev pointer to network device structure
|
|
* ifr pointer to network interface request structure
|
|
* cmd IOCTL command code
|
|
*
|
|
* returns 0 if success, otherwise error code
|
|
*/
|
|
static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
const size_t size = sizeof(sync_serial_settings);
|
|
sync_serial_settings new_line;
|
|
sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
unsigned int flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
|
|
|
|
/* return error if TTY interface open */
|
|
if (info->port.count)
|
|
return -EBUSY;
|
|
|
|
if (cmd != SIOCWANDEV)
|
|
return hdlc_ioctl(dev, ifr, cmd);
|
|
|
|
switch(ifr->ifr_settings.type) {
|
|
case IF_GET_IFACE: /* return current sync_serial_settings */
|
|
|
|
ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
|
|
if (ifr->ifr_settings.size < size) {
|
|
ifr->ifr_settings.size = size; /* data size wanted */
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
|
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
|
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
|
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
|
|
|
|
switch (flags){
|
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
|
|
case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
|
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
|
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
|
|
default: new_line.clock_type = CLOCK_DEFAULT;
|
|
}
|
|
|
|
new_line.clock_rate = info->params.clock_speed;
|
|
new_line.loopback = info->params.loopback ? 1:0;
|
|
|
|
if (copy_to_user(line, &new_line, size))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
|
|
|
|
if(!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
if (copy_from_user(&new_line, line, size))
|
|
return -EFAULT;
|
|
|
|
switch (new_line.clock_type)
|
|
{
|
|
case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
|
|
case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
|
|
case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
|
|
case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
|
|
case CLOCK_DEFAULT: flags = info->params.flags &
|
|
(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
|
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
|
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
|
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
|
|
default: return -EINVAL;
|
|
}
|
|
|
|
if (new_line.loopback != 0 && new_line.loopback != 1)
|
|
return -EINVAL;
|
|
|
|
info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
|
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
|
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
|
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
|
|
info->params.flags |= flags;
|
|
|
|
info->params.loopback = new_line.loopback;
|
|
|
|
if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
|
|
info->params.clock_speed = new_line.clock_rate;
|
|
else
|
|
info->params.clock_speed = 0;
|
|
|
|
/* if network interface up, reprogram hardware */
|
|
if (info->netcount)
|
|
mgsl_program_hw(info);
|
|
return 0;
|
|
|
|
default:
|
|
return hdlc_ioctl(dev, ifr, cmd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* called by network layer when transmit timeout is detected
|
|
*
|
|
* dev pointer to network device structure
|
|
*/
|
|
static void hdlcdev_tx_timeout(struct net_device *dev)
|
|
{
|
|
struct mgsl_struct *info = dev_to_port(dev);
|
|
unsigned long flags;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("hdlcdev_tx_timeout(%s)\n",dev->name);
|
|
|
|
dev->stats.tx_errors++;
|
|
dev->stats.tx_aborted_errors++;
|
|
|
|
spin_lock_irqsave(&info->irq_spinlock,flags);
|
|
usc_stop_transmitter(info);
|
|
spin_unlock_irqrestore(&info->irq_spinlock,flags);
|
|
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
/**
|
|
* called by device driver when transmit completes
|
|
* reenable network layer transmit if stopped
|
|
*
|
|
* info pointer to device instance information
|
|
*/
|
|
static void hdlcdev_tx_done(struct mgsl_struct *info)
|
|
{
|
|
if (netif_queue_stopped(info->netdev))
|
|
netif_wake_queue(info->netdev);
|
|
}
|
|
|
|
/**
|
|
* called by device driver when frame received
|
|
* pass frame to network layer
|
|
*
|
|
* info pointer to device instance information
|
|
* buf pointer to buffer contianing frame data
|
|
* size count of data bytes in buf
|
|
*/
|
|
static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
|
|
{
|
|
struct sk_buff *skb = dev_alloc_skb(size);
|
|
struct net_device *dev = info->netdev;
|
|
|
|
if (debug_level >= DEBUG_LEVEL_INFO)
|
|
printk("hdlcdev_rx(%s)\n", dev->name);
|
|
|
|
if (skb == NULL) {
|
|
printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
|
|
dev->name);
|
|
dev->stats.rx_dropped++;
|
|
return;
|
|
}
|
|
|
|
memcpy(skb_put(skb, size), buf, size);
|
|
|
|
skb->protocol = hdlc_type_trans(skb, dev);
|
|
|
|
dev->stats.rx_packets++;
|
|
dev->stats.rx_bytes += size;
|
|
|
|
netif_rx(skb);
|
|
}
|
|
|
|
static const struct net_device_ops hdlcdev_ops = {
|
|
.ndo_open = hdlcdev_open,
|
|
.ndo_stop = hdlcdev_close,
|
|
.ndo_change_mtu = hdlc_change_mtu,
|
|
.ndo_start_xmit = hdlc_start_xmit,
|
|
.ndo_do_ioctl = hdlcdev_ioctl,
|
|
.ndo_tx_timeout = hdlcdev_tx_timeout,
|
|
};
|
|
|
|
/**
|
|
* called by device driver when adding device instance
|
|
* do generic HDLC initialization
|
|
*
|
|
* info pointer to device instance information
|
|
*
|
|
* returns 0 if success, otherwise error code
|
|
*/
|
|
static int hdlcdev_init(struct mgsl_struct *info)
|
|
{
|
|
int rc;
|
|
struct net_device *dev;
|
|
hdlc_device *hdlc;
|
|
|
|
/* allocate and initialize network and HDLC layer objects */
|
|
|
|
if (!(dev = alloc_hdlcdev(info))) {
|
|
printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* for network layer reporting purposes only */
|
|
dev->base_addr = info->io_base;
|
|
dev->irq = info->irq_level;
|
|
dev->dma = info->dma_level;
|
|
|
|
/* network layer callbacks and settings */
|
|
dev->netdev_ops = &hdlcdev_ops;
|
|
dev->watchdog_timeo = 10 * HZ;
|
|
dev->tx_queue_len = 50;
|
|
|
|
/* generic HDLC layer callbacks and settings */
|
|
hdlc = dev_to_hdlc(dev);
|
|
hdlc->attach = hdlcdev_attach;
|
|
hdlc->xmit = hdlcdev_xmit;
|
|
|
|
/* register objects with HDLC layer */
|
|
if ((rc = register_hdlc_device(dev))) {
|
|
printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
|
|
free_netdev(dev);
|
|
return rc;
|
|
}
|
|
|
|
info->netdev = dev;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* called by device driver when removing device instance
|
|
* do generic HDLC cleanup
|
|
*
|
|
* info pointer to device instance information
|
|
*/
|
|
static void hdlcdev_exit(struct mgsl_struct *info)
|
|
{
|
|
unregister_hdlc_device(info->netdev);
|
|
free_netdev(info->netdev);
|
|
info->netdev = NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_HDLC */
|
|
|
|
|
|
static int __devinit synclink_init_one (struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
struct mgsl_struct *info;
|
|
|
|
if (pci_enable_device(dev)) {
|
|
printk("error enabling pci device %p\n", dev);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!(info = mgsl_allocate_device())) {
|
|
printk("can't allocate device instance data.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Copy user configuration info to device instance data */
|
|
|
|
info->io_base = pci_resource_start(dev, 2);
|
|
info->irq_level = dev->irq;
|
|
info->phys_memory_base = pci_resource_start(dev, 3);
|
|
|
|
/* Because veremap only works on page boundaries we must map
|
|
* a larger area than is actually implemented for the LCR
|
|
* memory range. We map a full page starting at the page boundary.
|
|
*/
|
|
info->phys_lcr_base = pci_resource_start(dev, 0);
|
|
info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
|
|
info->phys_lcr_base &= ~(PAGE_SIZE-1);
|
|
|
|
info->bus_type = MGSL_BUS_TYPE_PCI;
|
|
info->io_addr_size = 8;
|
|
info->irq_flags = IRQF_SHARED;
|
|
|
|
if (dev->device == 0x0210) {
|
|
/* Version 1 PCI9030 based universal PCI adapter */
|
|
info->misc_ctrl_value = 0x007c4080;
|
|
info->hw_version = 1;
|
|
} else {
|
|
/* Version 0 PCI9050 based 5V PCI adapter
|
|
* A PCI9050 bug prevents reading LCR registers if
|
|
* LCR base address bit 7 is set. Maintain shadow
|
|
* value so we can write to LCR misc control reg.
|
|
*/
|
|
info->misc_ctrl_value = 0x087e4546;
|
|
info->hw_version = 0;
|
|
}
|
|
|
|
mgsl_add_device(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __devexit synclink_remove_one (struct pci_dev *dev)
|
|
{
|
|
}
|
|
|