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linux_dsm_epyc7002/drivers/serial/ioc4_serial.c
Russell King b129a8ccd5 [SERIAL] Clean up and fix tty transmission start/stoping 
The start_tx and stop_tx methods were passed a flag to indicate
whether the start/stop was from the tty start/stop callbacks, and
some drivers used this flag to decide whether to ask the UART to
immediately stop transmission (where the UART supports such a
feature.)

There are other cases when we wish this to occur - when CTS is
lowered, or if we change from soft to hard flow control and CTS
is inactive.  In these cases, this flag was false, and we would
allow the transmitter to drain before stopping.

There is really only one case where we want to let the transmitter
drain before disabling, and that's when we run out of characters
to send.

Hence, re-jig the start_tx and stop_tx methods to eliminate this
flag, and introduce new functions for the special "disable and
allow transmitter to drain" case.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-08-31 10:12:14 +01:00

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003-2005 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* This file contains a module version of the ioc4 serial driver. This
* includes all the support functions needed (support functions, etc.)
* and the serial driver itself.
*/
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/circ_buf.h>
#include <linux/serial_reg.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioc4.h>
#include <linux/serial_core.h>
/*
* interesting things about the ioc4
*/
#define IOC4_NUM_SERIAL_PORTS 4 /* max ports per card */
#define IOC4_NUM_CARDS 8 /* max cards per partition */
#define GET_SIO_IR(_n) (_n == 0) ? (IOC4_SIO_IR_S0) : \
(_n == 1) ? (IOC4_SIO_IR_S1) : \
(_n == 2) ? (IOC4_SIO_IR_S2) : \
(IOC4_SIO_IR_S3)
#define GET_OTHER_IR(_n) (_n == 0) ? (IOC4_OTHER_IR_S0_MEMERR) : \
(_n == 1) ? (IOC4_OTHER_IR_S1_MEMERR) : \
(_n == 2) ? (IOC4_OTHER_IR_S2_MEMERR) : \
(IOC4_OTHER_IR_S3_MEMERR)
/*
* All IOC4 registers are 32 bits wide.
*/
/*
* PCI Memory Space Map
*/
#define IOC4_PCI_ERR_ADDR_L 0x000 /* Low Error Address */
#define IOC4_PCI_ERR_ADDR_VLD (0x1 << 0)
#define IOC4_PCI_ERR_ADDR_MST_ID_MSK (0xf << 1)
#define IOC4_PCI_ERR_ADDR_MST_NUM_MSK (0xe << 1)
#define IOC4_PCI_ERR_ADDR_MST_TYP_MSK (0x1 << 1)
#define IOC4_PCI_ERR_ADDR_MUL_ERR (0x1 << 5)
#define IOC4_PCI_ERR_ADDR_ADDR_MSK (0x3ffffff << 6)
/* Interrupt types */
#define IOC4_SIO_INTR_TYPE 0
#define IOC4_OTHER_INTR_TYPE 1
#define IOC4_NUM_INTR_TYPES 2
/* Bitmasks for IOC4_SIO_IR, IOC4_SIO_IEC, and IOC4_SIO_IES */
#define IOC4_SIO_IR_S0_TX_MT 0x00000001 /* Serial port 0 TX empty */
#define IOC4_SIO_IR_S0_RX_FULL 0x00000002 /* Port 0 RX buf full */
#define IOC4_SIO_IR_S0_RX_HIGH 0x00000004 /* Port 0 RX hiwat */
#define IOC4_SIO_IR_S0_RX_TIMER 0x00000008 /* Port 0 RX timeout */
#define IOC4_SIO_IR_S0_DELTA_DCD 0x00000010 /* Port 0 delta DCD */
#define IOC4_SIO_IR_S0_DELTA_CTS 0x00000020 /* Port 0 delta CTS */
#define IOC4_SIO_IR_S0_INT 0x00000040 /* Port 0 pass-thru intr */
#define IOC4_SIO_IR_S0_TX_EXPLICIT 0x00000080 /* Port 0 explicit TX thru */
#define IOC4_SIO_IR_S1_TX_MT 0x00000100 /* Serial port 1 */
#define IOC4_SIO_IR_S1_RX_FULL 0x00000200 /* */
#define IOC4_SIO_IR_S1_RX_HIGH 0x00000400 /* */
#define IOC4_SIO_IR_S1_RX_TIMER 0x00000800 /* */
#define IOC4_SIO_IR_S1_DELTA_DCD 0x00001000 /* */
#define IOC4_SIO_IR_S1_DELTA_CTS 0x00002000 /* */
#define IOC4_SIO_IR_S1_INT 0x00004000 /* */
#define IOC4_SIO_IR_S1_TX_EXPLICIT 0x00008000 /* */
#define IOC4_SIO_IR_S2_TX_MT 0x00010000 /* Serial port 2 */
#define IOC4_SIO_IR_S2_RX_FULL 0x00020000 /* */
#define IOC4_SIO_IR_S2_RX_HIGH 0x00040000 /* */
#define IOC4_SIO_IR_S2_RX_TIMER 0x00080000 /* */
#define IOC4_SIO_IR_S2_DELTA_DCD 0x00100000 /* */
#define IOC4_SIO_IR_S2_DELTA_CTS 0x00200000 /* */
#define IOC4_SIO_IR_S2_INT 0x00400000 /* */
#define IOC4_SIO_IR_S2_TX_EXPLICIT 0x00800000 /* */
#define IOC4_SIO_IR_S3_TX_MT 0x01000000 /* Serial port 3 */
#define IOC4_SIO_IR_S3_RX_FULL 0x02000000 /* */
#define IOC4_SIO_IR_S3_RX_HIGH 0x04000000 /* */
#define IOC4_SIO_IR_S3_RX_TIMER 0x08000000 /* */
#define IOC4_SIO_IR_S3_DELTA_DCD 0x10000000 /* */
#define IOC4_SIO_IR_S3_DELTA_CTS 0x20000000 /* */
#define IOC4_SIO_IR_S3_INT 0x40000000 /* */
#define IOC4_SIO_IR_S3_TX_EXPLICIT 0x80000000 /* */
/* Per device interrupt masks */
#define IOC4_SIO_IR_S0 (IOC4_SIO_IR_S0_TX_MT | \
IOC4_SIO_IR_S0_RX_FULL | \
IOC4_SIO_IR_S0_RX_HIGH | \
IOC4_SIO_IR_S0_RX_TIMER | \
IOC4_SIO_IR_S0_DELTA_DCD | \
IOC4_SIO_IR_S0_DELTA_CTS | \
IOC4_SIO_IR_S0_INT | \
IOC4_SIO_IR_S0_TX_EXPLICIT)
#define IOC4_SIO_IR_S1 (IOC4_SIO_IR_S1_TX_MT | \
IOC4_SIO_IR_S1_RX_FULL | \
IOC4_SIO_IR_S1_RX_HIGH | \
IOC4_SIO_IR_S1_RX_TIMER | \
IOC4_SIO_IR_S1_DELTA_DCD | \
IOC4_SIO_IR_S1_DELTA_CTS | \
IOC4_SIO_IR_S1_INT | \
IOC4_SIO_IR_S1_TX_EXPLICIT)
#define IOC4_SIO_IR_S2 (IOC4_SIO_IR_S2_TX_MT | \
IOC4_SIO_IR_S2_RX_FULL | \
IOC4_SIO_IR_S2_RX_HIGH | \
IOC4_SIO_IR_S2_RX_TIMER | \
IOC4_SIO_IR_S2_DELTA_DCD | \
IOC4_SIO_IR_S2_DELTA_CTS | \
IOC4_SIO_IR_S2_INT | \
IOC4_SIO_IR_S2_TX_EXPLICIT)
#define IOC4_SIO_IR_S3 (IOC4_SIO_IR_S3_TX_MT | \
IOC4_SIO_IR_S3_RX_FULL | \
IOC4_SIO_IR_S3_RX_HIGH | \
IOC4_SIO_IR_S3_RX_TIMER | \
IOC4_SIO_IR_S3_DELTA_DCD | \
IOC4_SIO_IR_S3_DELTA_CTS | \
IOC4_SIO_IR_S3_INT | \
IOC4_SIO_IR_S3_TX_EXPLICIT)
/* Bitmasks for IOC4_OTHER_IR, IOC4_OTHER_IEC, and IOC4_OTHER_IES */
#define IOC4_OTHER_IR_ATA_INT 0x00000001 /* ATAPI intr pass-thru */
#define IOC4_OTHER_IR_ATA_MEMERR 0x00000002 /* ATAPI DMA PCI error */
#define IOC4_OTHER_IR_S0_MEMERR 0x00000004 /* Port 0 PCI error */
#define IOC4_OTHER_IR_S1_MEMERR 0x00000008 /* Port 1 PCI error */
#define IOC4_OTHER_IR_S2_MEMERR 0x00000010 /* Port 2 PCI error */
#define IOC4_OTHER_IR_S3_MEMERR 0x00000020 /* Port 3 PCI error */
#define IOC4_OTHER_IR_KBD_INT 0x00000040 /* Keyboard/mouse */
#define IOC4_OTHER_IR_RESERVED 0x007fff80 /* Reserved */
#define IOC4_OTHER_IR_RT_INT 0x00800000 /* INT_OUT section output */
#define IOC4_OTHER_IR_GEN_INT 0xff000000 /* Generic pins */
#define IOC4_OTHER_IR_SER_MEMERR (IOC4_OTHER_IR_S0_MEMERR | IOC4_OTHER_IR_S1_MEMERR | \
IOC4_OTHER_IR_S2_MEMERR | IOC4_OTHER_IR_S3_MEMERR)
/* Bitmasks for IOC4_SIO_CR */
#define IOC4_SIO_CR_CMD_PULSE_SHIFT 0 /* byte bus strobe shift */
#define IOC4_SIO_CR_ARB_DIAG_TX0 0x00000000
#define IOC4_SIO_CR_ARB_DIAG_RX0 0x00000010
#define IOC4_SIO_CR_ARB_DIAG_TX1 0x00000020
#define IOC4_SIO_CR_ARB_DIAG_RX1 0x00000030
#define IOC4_SIO_CR_ARB_DIAG_TX2 0x00000040
#define IOC4_SIO_CR_ARB_DIAG_RX2 0x00000050
#define IOC4_SIO_CR_ARB_DIAG_TX3 0x00000060
#define IOC4_SIO_CR_ARB_DIAG_RX3 0x00000070
#define IOC4_SIO_CR_SIO_DIAG_IDLE 0x00000080 /* 0 -> active request among
serial ports (ro) */
/* Defs for some of the generic I/O pins */
#define IOC4_GPCR_UART0_MODESEL 0x10 /* Pin is output to port 0
mode sel */
#define IOC4_GPCR_UART1_MODESEL 0x20 /* Pin is output to port 1
mode sel */
#define IOC4_GPCR_UART2_MODESEL 0x40 /* Pin is output to port 2
mode sel */
#define IOC4_GPCR_UART3_MODESEL 0x80 /* Pin is output to port 3
mode sel */
#define IOC4_GPPR_UART0_MODESEL_PIN 4 /* GIO pin controlling
uart 0 mode select */
#define IOC4_GPPR_UART1_MODESEL_PIN 5 /* GIO pin controlling
uart 1 mode select */
#define IOC4_GPPR_UART2_MODESEL_PIN 6 /* GIO pin controlling
uart 2 mode select */
#define IOC4_GPPR_UART3_MODESEL_PIN 7 /* GIO pin controlling
uart 3 mode select */
/* Bitmasks for serial RX status byte */
#define IOC4_RXSB_OVERRUN 0x01 /* Char(s) lost */
#define IOC4_RXSB_PAR_ERR 0x02 /* Parity error */
#define IOC4_RXSB_FRAME_ERR 0x04 /* Framing error */
#define IOC4_RXSB_BREAK 0x08 /* Break character */
#define IOC4_RXSB_CTS 0x10 /* State of CTS */
#define IOC4_RXSB_DCD 0x20 /* State of DCD */
#define IOC4_RXSB_MODEM_VALID 0x40 /* DCD, CTS, and OVERRUN are valid */
#define IOC4_RXSB_DATA_VALID 0x80 /* Data byte, FRAME_ERR PAR_ERR
* & BREAK valid */
/* Bitmasks for serial TX control byte */
#define IOC4_TXCB_INT_WHEN_DONE 0x20 /* Interrupt after this byte is sent */
#define IOC4_TXCB_INVALID 0x00 /* Byte is invalid */
#define IOC4_TXCB_VALID 0x40 /* Byte is valid */
#define IOC4_TXCB_MCR 0x80 /* Data<7:0> to modem control reg */
#define IOC4_TXCB_DELAY 0xc0 /* Delay data<7:0> mSec */
/* Bitmasks for IOC4_SBBR_L */
#define IOC4_SBBR_L_SIZE 0x00000001 /* 0 == 1KB rings, 1 == 4KB rings */
/* Bitmasks for IOC4_SSCR_<3:0> */
#define IOC4_SSCR_RX_THRESHOLD 0x000001ff /* Hiwater mark */
#define IOC4_SSCR_TX_TIMER_BUSY 0x00010000 /* TX timer in progress */
#define IOC4_SSCR_HFC_EN 0x00020000 /* Hardware flow control enabled */
#define IOC4_SSCR_RX_RING_DCD 0x00040000 /* Post RX record on delta-DCD */
#define IOC4_SSCR_RX_RING_CTS 0x00080000 /* Post RX record on delta-CTS */
#define IOC4_SSCR_DIAG 0x00200000 /* Bypass clock divider for sim */
#define IOC4_SSCR_RX_DRAIN 0x08000000 /* Drain RX buffer to memory */
#define IOC4_SSCR_DMA_EN 0x10000000 /* Enable ring buffer DMA */
#define IOC4_SSCR_DMA_PAUSE 0x20000000 /* Pause DMA */
#define IOC4_SSCR_PAUSE_STATE 0x40000000 /* Sets when PAUSE takes effect */
#define IOC4_SSCR_RESET 0x80000000 /* Reset DMA channels */
/* All producer/comsumer pointers are the same bitfield */
#define IOC4_PROD_CONS_PTR_4K 0x00000ff8 /* For 4K buffers */
#define IOC4_PROD_CONS_PTR_1K 0x000003f8 /* For 1K buffers */
#define IOC4_PROD_CONS_PTR_OFF 3
/* Bitmasks for IOC4_SRCIR_<3:0> */
#define IOC4_SRCIR_ARM 0x80000000 /* Arm RX timer */
/* Bitmasks for IOC4_SHADOW_<3:0> */
#define IOC4_SHADOW_DR 0x00000001 /* Data ready */
#define IOC4_SHADOW_OE 0x00000002 /* Overrun error */
#define IOC4_SHADOW_PE 0x00000004 /* Parity error */
#define IOC4_SHADOW_FE 0x00000008 /* Framing error */
#define IOC4_SHADOW_BI 0x00000010 /* Break interrupt */
#define IOC4_SHADOW_THRE 0x00000020 /* Xmit holding register empty */
#define IOC4_SHADOW_TEMT 0x00000040 /* Xmit shift register empty */
#define IOC4_SHADOW_RFCE 0x00000080 /* Char in RX fifo has an error */
#define IOC4_SHADOW_DCTS 0x00010000 /* Delta clear to send */
#define IOC4_SHADOW_DDCD 0x00080000 /* Delta data carrier detect */
#define IOC4_SHADOW_CTS 0x00100000 /* Clear to send */
#define IOC4_SHADOW_DCD 0x00800000 /* Data carrier detect */
#define IOC4_SHADOW_DTR 0x01000000 /* Data terminal ready */
#define IOC4_SHADOW_RTS 0x02000000 /* Request to send */
#define IOC4_SHADOW_OUT1 0x04000000 /* 16550 OUT1 bit */
#define IOC4_SHADOW_OUT2 0x08000000 /* 16550 OUT2 bit */
#define IOC4_SHADOW_LOOP 0x10000000 /* Loopback enabled */
/* Bitmasks for IOC4_SRTR_<3:0> */
#define IOC4_SRTR_CNT 0x00000fff /* Reload value for RX timer */
#define IOC4_SRTR_CNT_VAL 0x0fff0000 /* Current value of RX timer */
#define IOC4_SRTR_CNT_VAL_SHIFT 16
#define IOC4_SRTR_HZ 16000 /* SRTR clock frequency */
/* Serial port register map used for DMA and PIO serial I/O */
struct ioc4_serialregs {
uint32_t sscr;
uint32_t stpir;
uint32_t stcir;
uint32_t srpir;
uint32_t srcir;
uint32_t srtr;
uint32_t shadow;
};
/* IOC4 UART register map */
struct ioc4_uartregs {
char i4u_lcr;
union {
char iir; /* read only */
char fcr; /* write only */
} u3;
union {
char ier; /* DLAB == 0 */
char dlm; /* DLAB == 1 */
} u2;
union {
char rbr; /* read only, DLAB == 0 */
char thr; /* write only, DLAB == 0 */
char dll; /* DLAB == 1 */
} u1;
char i4u_scr;
char i4u_msr;
char i4u_lsr;
char i4u_mcr;
};
/* short names */
#define i4u_dll u1.dll
#define i4u_ier u2.ier
#define i4u_dlm u2.dlm
#define i4u_fcr u3.fcr
/* Serial port registers used for DMA serial I/O */
struct ioc4_serial {
uint32_t sbbr01_l;
uint32_t sbbr01_h;
uint32_t sbbr23_l;
uint32_t sbbr23_h;
struct ioc4_serialregs port_0;
struct ioc4_serialregs port_1;
struct ioc4_serialregs port_2;
struct ioc4_serialregs port_3;
struct ioc4_uartregs uart_0;
struct ioc4_uartregs uart_1;
struct ioc4_uartregs uart_2;
struct ioc4_uartregs uart_3;
} ioc4_serial;
/* UART clock speed */
#define IOC4_SER_XIN_CLK_66 66666667
#define IOC4_SER_XIN_CLK_33 33333333
#define IOC4_W_IES 0
#define IOC4_W_IEC 1
typedef void ioc4_intr_func_f(void *, uint32_t);
typedef ioc4_intr_func_f *ioc4_intr_func_t;
/* defining this will get you LOTS of great debug info */
//#define DEBUG_INTERRUPTS
#define DPRINT_CONFIG(_x...) ;
//#define DPRINT_CONFIG(_x...) printk _x
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/* number of characters we want to transmit to the lower level at a time */
#define IOC4_MAX_CHARS 128
/* Device name we're using */
#define DEVICE_NAME "ttyIOC"
#define DEVICE_MAJOR 204
#define DEVICE_MINOR 50
/* register offsets */
#define IOC4_SERIAL_OFFSET 0x300
/* flags for next_char_state */
#define NCS_BREAK 0x1
#define NCS_PARITY 0x2
#define NCS_FRAMING 0x4
#define NCS_OVERRUN 0x8
/* cause we need SOME parameters ... */
#define MIN_BAUD_SUPPORTED 1200
#define MAX_BAUD_SUPPORTED 115200
/* protocol types supported */
enum sio_proto {
PROTO_RS232,
PROTO_RS422
};
/* Notification types */
#define N_DATA_READY 0x01
#define N_OUTPUT_LOWAT 0x02
#define N_BREAK 0x04
#define N_PARITY_ERROR 0x08
#define N_FRAMING_ERROR 0x10
#define N_OVERRUN_ERROR 0x20
#define N_DDCD 0x40
#define N_DCTS 0x80
#define N_ALL_INPUT (N_DATA_READY | N_BREAK | \
N_PARITY_ERROR | N_FRAMING_ERROR | \
N_OVERRUN_ERROR | N_DDCD | N_DCTS)
#define N_ALL_OUTPUT N_OUTPUT_LOWAT
#define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR | N_OVERRUN_ERROR)
#define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK | \
N_PARITY_ERROR | N_FRAMING_ERROR | \
N_OVERRUN_ERROR | N_DDCD | N_DCTS)
#define SER_DIVISOR(_x, clk) (((clk) + (_x) * 8) / ((_x) * 16))
#define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))
/* Some masks */
#define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
| UART_LCR_WLEN7 | UART_LCR_WLEN8)
#define LCR_MASK_STOP_BITS (UART_LCR_STOP)
#define PENDING(_p) (readl(&(_p)->ip_mem->sio_ir.raw) & _p->ip_ienb)
#define READ_SIO_IR(_p) readl(&(_p)->ip_mem->sio_ir.raw)
/* Default to 4k buffers */
#ifdef IOC4_1K_BUFFERS
#define RING_BUF_SIZE 1024
#define IOC4_BUF_SIZE_BIT 0
#define PROD_CONS_MASK IOC4_PROD_CONS_PTR_1K
#else
#define RING_BUF_SIZE 4096
#define IOC4_BUF_SIZE_BIT IOC4_SBBR_L_SIZE
#define PROD_CONS_MASK IOC4_PROD_CONS_PTR_4K
#endif
#define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4)
/*
* This is the entry saved by the driver - one per card
*/
struct ioc4_control {
int ic_irq;
struct {
/* uart ports are allocated here */
struct uart_port icp_uart_port;
/* Handy reference material */
struct ioc4_port *icp_port;
} ic_port[IOC4_NUM_SERIAL_PORTS];
struct ioc4_soft *ic_soft;
};
/*
* per-IOC4 data structure
*/
#define MAX_IOC4_INTR_ENTS (8 * sizeof(uint32_t))
struct ioc4_soft {
struct ioc4_misc_regs __iomem *is_ioc4_misc_addr;
struct ioc4_serial __iomem *is_ioc4_serial_addr;
/* Each interrupt type has an entry in the array */
struct ioc4_intr_type {
/*
* Each in-use entry in this array contains at least
* one nonzero bit in sd_bits; no two entries in this
* array have overlapping sd_bits values.
*/
struct ioc4_intr_info {
uint32_t sd_bits;
ioc4_intr_func_f *sd_intr;
void *sd_info;
} is_intr_info[MAX_IOC4_INTR_ENTS];
/* Number of entries active in the above array */
atomic_t is_num_intrs;
} is_intr_type[IOC4_NUM_INTR_TYPES];
/* is_ir_lock must be held while
* modifying sio_ie values, so
* we can be sure that sio_ie is
* not changing when we read it
* along with sio_ir.
*/
spinlock_t is_ir_lock; /* SIO_IE[SC] mod lock */
};
/* Local port info for each IOC4 serial ports */
struct ioc4_port {
struct uart_port *ip_port;
/* Back ptrs for this port */
struct ioc4_control *ip_control;
struct pci_dev *ip_pdev;
struct ioc4_soft *ip_ioc4_soft;
/* pci mem addresses */
struct ioc4_misc_regs __iomem *ip_mem;
struct ioc4_serial __iomem *ip_serial;
struct ioc4_serialregs __iomem *ip_serial_regs;
struct ioc4_uartregs __iomem *ip_uart_regs;
/* Ring buffer page for this port */
dma_addr_t ip_dma_ringbuf;
/* vaddr of ring buffer */
struct ring_buffer *ip_cpu_ringbuf;
/* Rings for this port */
struct ring *ip_inring;
struct ring *ip_outring;
/* Hook to port specific values */
struct hooks *ip_hooks;
spinlock_t ip_lock;
/* Various rx/tx parameters */
int ip_baud;
int ip_tx_lowat;
int ip_rx_timeout;
/* Copy of notification bits */
int ip_notify;
/* Shadow copies of various registers so we don't need to PIO
* read them constantly
*/
uint32_t ip_ienb; /* Enabled interrupts */
uint32_t ip_sscr;
uint32_t ip_tx_prod;
uint32_t ip_rx_cons;
int ip_pci_bus_speed;
unsigned char ip_flags;
};
/* tx low water mark. We need to notify the driver whenever tx is getting
* close to empty so it can refill the tx buffer and keep things going.
* Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
* have no trouble getting in more chars in time (I certainly hope so).
*/
#define TX_LOWAT_LATENCY 1000
#define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY)
#define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
/* Flags per port */
#define INPUT_HIGH 0x01
#define DCD_ON 0x02
#define LOWAT_WRITTEN 0x04
#define READ_ABORTED 0x08
/* Since each port has different register offsets and bitmasks
* for everything, we'll store those that we need in tables so we
* don't have to be constantly checking the port we are dealing with.
*/
struct hooks {
uint32_t intr_delta_dcd;
uint32_t intr_delta_cts;
uint32_t intr_tx_mt;
uint32_t intr_rx_timer;
uint32_t intr_rx_high;
uint32_t intr_tx_explicit;
uint32_t intr_dma_error;
uint32_t intr_clear;
uint32_t intr_all;
int rs422_select_pin;
};
static struct hooks hooks_array[IOC4_NUM_SERIAL_PORTS] = {
/* Values for port 0 */
{
IOC4_SIO_IR_S0_DELTA_DCD, IOC4_SIO_IR_S0_DELTA_CTS,
IOC4_SIO_IR_S0_TX_MT, IOC4_SIO_IR_S0_RX_TIMER,
IOC4_SIO_IR_S0_RX_HIGH, IOC4_SIO_IR_S0_TX_EXPLICIT,
IOC4_OTHER_IR_S0_MEMERR,
(IOC4_SIO_IR_S0_TX_MT | IOC4_SIO_IR_S0_RX_FULL |
IOC4_SIO_IR_S0_RX_HIGH | IOC4_SIO_IR_S0_RX_TIMER |
IOC4_SIO_IR_S0_DELTA_DCD | IOC4_SIO_IR_S0_DELTA_CTS |
IOC4_SIO_IR_S0_INT | IOC4_SIO_IR_S0_TX_EXPLICIT),
IOC4_SIO_IR_S0, IOC4_GPPR_UART0_MODESEL_PIN,
},
/* Values for port 1 */
{
IOC4_SIO_IR_S1_DELTA_DCD, IOC4_SIO_IR_S1_DELTA_CTS,
IOC4_SIO_IR_S1_TX_MT, IOC4_SIO_IR_S1_RX_TIMER,
IOC4_SIO_IR_S1_RX_HIGH, IOC4_SIO_IR_S1_TX_EXPLICIT,
IOC4_OTHER_IR_S1_MEMERR,
(IOC4_SIO_IR_S1_TX_MT | IOC4_SIO_IR_S1_RX_FULL |
IOC4_SIO_IR_S1_RX_HIGH | IOC4_SIO_IR_S1_RX_TIMER |
IOC4_SIO_IR_S1_DELTA_DCD | IOC4_SIO_IR_S1_DELTA_CTS |
IOC4_SIO_IR_S1_INT | IOC4_SIO_IR_S1_TX_EXPLICIT),
IOC4_SIO_IR_S1, IOC4_GPPR_UART1_MODESEL_PIN,
},
/* Values for port 2 */
{
IOC4_SIO_IR_S2_DELTA_DCD, IOC4_SIO_IR_S2_DELTA_CTS,
IOC4_SIO_IR_S2_TX_MT, IOC4_SIO_IR_S2_RX_TIMER,
IOC4_SIO_IR_S2_RX_HIGH, IOC4_SIO_IR_S2_TX_EXPLICIT,
IOC4_OTHER_IR_S2_MEMERR,
(IOC4_SIO_IR_S2_TX_MT | IOC4_SIO_IR_S2_RX_FULL |
IOC4_SIO_IR_S2_RX_HIGH | IOC4_SIO_IR_S2_RX_TIMER |
IOC4_SIO_IR_S2_DELTA_DCD | IOC4_SIO_IR_S2_DELTA_CTS |
IOC4_SIO_IR_S2_INT | IOC4_SIO_IR_S2_TX_EXPLICIT),
IOC4_SIO_IR_S2, IOC4_GPPR_UART2_MODESEL_PIN,
},
/* Values for port 3 */
{
IOC4_SIO_IR_S3_DELTA_DCD, IOC4_SIO_IR_S3_DELTA_CTS,
IOC4_SIO_IR_S3_TX_MT, IOC4_SIO_IR_S3_RX_TIMER,
IOC4_SIO_IR_S3_RX_HIGH, IOC4_SIO_IR_S3_TX_EXPLICIT,
IOC4_OTHER_IR_S3_MEMERR,
(IOC4_SIO_IR_S3_TX_MT | IOC4_SIO_IR_S3_RX_FULL |
IOC4_SIO_IR_S3_RX_HIGH | IOC4_SIO_IR_S3_RX_TIMER |
IOC4_SIO_IR_S3_DELTA_DCD | IOC4_SIO_IR_S3_DELTA_CTS |
IOC4_SIO_IR_S3_INT | IOC4_SIO_IR_S3_TX_EXPLICIT),
IOC4_SIO_IR_S3, IOC4_GPPR_UART3_MODESEL_PIN,
}
};
/* A ring buffer entry */
struct ring_entry {
union {
struct {
uint32_t alldata;
uint32_t allsc;
} all;
struct {
char data[4]; /* data bytes */
char sc[4]; /* status/control */
} s;
} u;
};
/* Test the valid bits in any of the 4 sc chars using "allsc" member */
#define RING_ANY_VALID \
((uint32_t)(IOC4_RXSB_MODEM_VALID | IOC4_RXSB_DATA_VALID) * 0x01010101)
#define ring_sc u.s.sc
#define ring_data u.s.data
#define ring_allsc u.all.allsc
/* Number of entries per ring buffer. */
#define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
/* An individual ring */
struct ring {
struct ring_entry entries[ENTRIES_PER_RING];
};
/* The whole enchilada */
struct ring_buffer {
struct ring TX_0_OR_2;
struct ring RX_0_OR_2;
struct ring TX_1_OR_3;
struct ring RX_1_OR_3;
};
/* Get a ring from a port struct */
#define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
/* Infinite loop detection.
*/
#define MAXITER 10000000
/* Prototypes */
static void receive_chars(struct uart_port *);
static void handle_intr(void *arg, uint32_t sio_ir);
/**
* write_ireg - write the interrupt regs
* @ioc4_soft: ptr to soft struct for this port
* @val: value to write
* @which: which register
* @type: which ireg set
*/
static inline void
write_ireg(struct ioc4_soft *ioc4_soft, uint32_t val, int which, int type)
{
struct ioc4_misc_regs __iomem *mem = ioc4_soft->is_ioc4_misc_addr;
unsigned long flags;
spin_lock_irqsave(&ioc4_soft->is_ir_lock, flags);
switch (type) {
case IOC4_SIO_INTR_TYPE:
switch (which) {
case IOC4_W_IES:
writel(val, &mem->sio_ies.raw);
break;
case IOC4_W_IEC:
writel(val, &mem->sio_iec.raw);
break;
}
break;
case IOC4_OTHER_INTR_TYPE:
switch (which) {
case IOC4_W_IES:
writel(val, &mem->other_ies.raw);
break;
case IOC4_W_IEC:
writel(val, &mem->other_iec.raw);
break;
}
break;
default:
break;
}
spin_unlock_irqrestore(&ioc4_soft->is_ir_lock, flags);
}
/**
* set_baud - Baud rate setting code
* @port: port to set
* @baud: baud rate to use
*/
static int set_baud(struct ioc4_port *port, int baud)
{
int actual_baud;
int diff;
int lcr;
unsigned short divisor;
struct ioc4_uartregs __iomem *uart;
divisor = SER_DIVISOR(baud, port->ip_pci_bus_speed);
if (!divisor)
return 1;
actual_baud = DIVISOR_TO_BAUD(divisor, port->ip_pci_bus_speed);
diff = actual_baud - baud;
if (diff < 0)
diff = -diff;
/* If we're within 1%, we've found a match */
if (diff * 100 > actual_baud)
return 1;
uart = port->ip_uart_regs;
lcr = readb(&uart->i4u_lcr);
writeb(lcr | UART_LCR_DLAB, &uart->i4u_lcr);
writeb((unsigned char)divisor, &uart->i4u_dll);
writeb((unsigned char)(divisor >> 8), &uart->i4u_dlm);
writeb(lcr, &uart->i4u_lcr);
return 0;
}
/**
* get_ioc4_port - given a uart port, return the control structure
* @port: uart port
*/
static struct ioc4_port *get_ioc4_port(struct uart_port *the_port)
{
struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev);
struct ioc4_control *control = idd->idd_serial_data;
int ii;
if (control) {
for ( ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++ ) {
if (!control->ic_port[ii].icp_port)
continue;
if (the_port == control->ic_port[ii].icp_port->ip_port)
return control->ic_port[ii].icp_port;
}
}
return NULL;
}
/* The IOC4 hardware provides no atomic way to determine if interrupts
* are pending since two reads are required to do so. The handler must
* read the SIO_IR and the SIO_IES, and take the logical and of the
* two. When this value is zero, all interrupts have been serviced and
* the handler may return.
*
* This has the unfortunate "hole" that, if some other CPU or
* some other thread or some higher level interrupt manages to
* modify SIO_IE between our reads of SIO_IR and SIO_IE, we may
* think we have observed SIO_IR&SIO_IE==0 when in fact this
* condition never really occurred.
*
* To solve this, we use a simple spinlock that must be held
* whenever modifying SIO_IE; holding this lock while observing
* both SIO_IR and SIO_IE guarantees that we do not falsely
* conclude that no enabled interrupts are pending.
*/
static inline uint32_t
pending_intrs(struct ioc4_soft *soft, int type)
{
struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
unsigned long flag;
uint32_t intrs = 0;
BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
|| (type == IOC4_OTHER_INTR_TYPE)));
spin_lock_irqsave(&soft->is_ir_lock, flag);
switch (type) {
case IOC4_SIO_INTR_TYPE:
intrs = readl(&mem->sio_ir.raw) & readl(&mem->sio_ies.raw);
break;
case IOC4_OTHER_INTR_TYPE:
intrs = readl(&mem->other_ir.raw) & readl(&mem->other_ies.raw);
/* Don't process any ATA interrupte */
intrs &= ~(IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
break;
default:
break;
}
spin_unlock_irqrestore(&soft->is_ir_lock, flag);
return intrs;
}
/**
* port_init - Initialize the sio and ioc4 hardware for a given port
* called per port from attach...
* @port: port to initialize
*/
static int inline port_init(struct ioc4_port *port)
{
uint32_t sio_cr;
struct hooks *hooks = port->ip_hooks;
struct ioc4_uartregs __iomem *uart;
/* Idle the IOC4 serial interface */
writel(IOC4_SSCR_RESET, &port->ip_serial_regs->sscr);
/* Wait until any pending bus activity for this port has ceased */
do
sio_cr = readl(&port->ip_mem->sio_cr.raw);
while (!(sio_cr & IOC4_SIO_CR_SIO_DIAG_IDLE));
/* Finish reset sequence */
writel(0, &port->ip_serial_regs->sscr);
/* Once RESET is done, reload cached tx_prod and rx_cons values
* and set rings to empty by making prod == cons
*/
port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir);
/* Disable interrupts for this 16550 */
uart = port->ip_uart_regs;
writeb(0, &uart->i4u_lcr);
writeb(0, &uart->i4u_ier);
/* Set the default baud */
set_baud(port, port->ip_baud);
/* Set line control to 8 bits no parity */
writeb(UART_LCR_WLEN8 | 0, &uart->i4u_lcr);
/* UART_LCR_STOP == 1 stop */
/* Enable the FIFOs */
writeb(UART_FCR_ENABLE_FIFO, &uart->i4u_fcr);
/* then reset 16550 FIFOs */
writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
&uart->i4u_fcr);
/* Clear modem control register */
writeb(0, &uart->i4u_mcr);
/* Clear deltas in modem status register */
readb(&uart->i4u_msr);
/* Only do this once per port pair */
if (port->ip_hooks == &hooks_array[0]
|| port->ip_hooks == &hooks_array[2]) {
unsigned long ring_pci_addr;
uint32_t __iomem *sbbr_l;
uint32_t __iomem *sbbr_h;
if (port->ip_hooks == &hooks_array[0]) {
sbbr_l = &port->ip_serial->sbbr01_l;
sbbr_h = &port->ip_serial->sbbr01_h;
} else {
sbbr_l = &port->ip_serial->sbbr23_l;
sbbr_h = &port->ip_serial->sbbr23_h;
}
ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
DPRINT_CONFIG(("%s: ring_pci_addr 0x%lx\n",
__FUNCTION__, ring_pci_addr));
writel((unsigned int)((uint64_t)ring_pci_addr >> 32), sbbr_h);
writel((unsigned int)ring_pci_addr | IOC4_BUF_SIZE_BIT, sbbr_l);
}
/* Set the receive timeout value to 10 msec */
writel(IOC4_SRTR_HZ / 100, &port->ip_serial_regs->srtr);
/* Set rx threshold, enable DMA */
/* Set high water mark at 3/4 of full ring */
port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
/* Disable and clear all serial related interrupt bits */
write_ireg(port->ip_ioc4_soft, hooks->intr_clear,
IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
port->ip_ienb &= ~hooks->intr_clear;
writel(hooks->intr_clear, &port->ip_mem->sio_ir.raw);
return 0;
}
/**
* handle_dma_error_intr - service any pending DMA error interrupts for the
* given port - 2nd level called via sd_intr
* @arg: handler arg
* @other_ir: ioc4regs
*/
static void handle_dma_error_intr(void *arg, uint32_t other_ir)
{
struct ioc4_port *port = (struct ioc4_port *)arg;
struct hooks *hooks = port->ip_hooks;
unsigned int flags;
spin_lock_irqsave(&port->ip_lock, flags);
/* ACK the interrupt */
writel(hooks->intr_dma_error, &port->ip_mem->other_ir.raw);
if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_VLD) {
printk(KERN_ERR
"PCI error address is 0x%lx, "
"master is serial port %c %s\n",
(((uint64_t)readl(&port->ip_mem->pci_err_addr_h)
<< 32)
| readl(&port->ip_mem->pci_err_addr_l.raw))
& IOC4_PCI_ERR_ADDR_ADDR_MSK, '1' +
((char)(readl(&port->ip_mem->pci_err_addr_l.raw) &
IOC4_PCI_ERR_ADDR_MST_NUM_MSK) >> 1),
(readl(&port->ip_mem->pci_err_addr_l.raw)
& IOC4_PCI_ERR_ADDR_MST_TYP_MSK)
? "RX" : "TX");
if (readl(&port->ip_mem->pci_err_addr_l.raw)
& IOC4_PCI_ERR_ADDR_MUL_ERR) {
printk(KERN_ERR
"Multiple errors occurred\n");
}
}
spin_unlock_irqrestore(&port->ip_lock, flags);
/* Re-enable DMA error interrupts */
write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES,
IOC4_OTHER_INTR_TYPE);
}
/**
* intr_connect - interrupt connect function
* @soft: soft struct for this card
* @type: interrupt type
* @intrbits: bit pattern to set
* @intr: handler function
* @info: handler arg
*/
static void
intr_connect(struct ioc4_soft *soft, int type,
uint32_t intrbits, ioc4_intr_func_f * intr, void *info)
{
int i;
struct ioc4_intr_info *intr_ptr;
BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
|| (type == IOC4_OTHER_INTR_TYPE)));
i = atomic_inc(&soft-> is_intr_type[type].is_num_intrs) - 1;
BUG_ON(!(i < MAX_IOC4_INTR_ENTS || (printk("i %d\n", i), 0)));
/* Save off the lower level interrupt handler */
intr_ptr = &soft->is_intr_type[type].is_intr_info[i];
intr_ptr->sd_bits = intrbits;
intr_ptr->sd_intr = intr;
intr_ptr->sd_info = info;
}
/**
* ioc4_intr - Top level IOC4 interrupt handler.
* @irq: irq value
* @arg: handler arg
* @regs: registers
*/
static irqreturn_t ioc4_intr(int irq, void *arg, struct pt_regs *regs)
{
struct ioc4_soft *soft;
uint32_t this_ir, this_mir;
int xx, num_intrs = 0;
int intr_type;
int handled = 0;
struct ioc4_intr_info *ii;
soft = arg;
for (intr_type = 0; intr_type < IOC4_NUM_INTR_TYPES; intr_type++) {
num_intrs = (int)atomic_read(
&soft->is_intr_type[intr_type].is_num_intrs);
this_mir = this_ir = pending_intrs(soft, intr_type);
/* Farm out the interrupt to the various drivers depending on
* which interrupt bits are set.
*/
for (xx = 0; xx < num_intrs; xx++) {
ii = &soft->is_intr_type[intr_type].is_intr_info[xx];
if ((this_mir = this_ir & ii->sd_bits)) {
/* Disable owned interrupts, call handler */
handled++;
write_ireg(soft, ii->sd_bits, IOC4_W_IEC,
intr_type);
ii->sd_intr(ii->sd_info, this_mir);
this_ir &= ~this_mir;
}
}
if (this_ir) {
printk(KERN_ERR
"unknown IOC4 %s interrupt 0x%x, sio_ir = 0x%x,"
" sio_ies = 0x%x, other_ir = 0x%x :"
"other_ies = 0x%x\n",
(intr_type == IOC4_SIO_INTR_TYPE) ? "sio" :
"other", this_ir,
readl(&soft->is_ioc4_misc_addr->sio_ir.raw),
readl(&soft->is_ioc4_misc_addr->sio_ies.raw),
readl(&soft->is_ioc4_misc_addr->other_ir.raw),
readl(&soft->is_ioc4_misc_addr->other_ies.raw));
}
}
#ifdef DEBUG_INTERRUPTS
{
struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
spinlock_t *lp = &soft->is_ir_lock;
unsigned long flag;
spin_lock_irqsave(&soft->is_ir_lock, flag);
printk ("%s : %d : mem 0x%p sio_ir 0x%x sio_ies 0x%x "
"other_ir 0x%x other_ies 0x%x mask 0x%x\n",
__FUNCTION__, __LINE__,
(void *)mem, readl(&mem->sio_ir.raw),
readl(&mem->sio_ies.raw),
readl(&mem->other_ir.raw),
readl(&mem->other_ies.raw),
IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
spin_unlock_irqrestore(&soft->is_ir_lock, flag);
}
#endif
return handled ? IRQ_HANDLED : IRQ_NONE;
}
/**
* ioc4_attach_local - Device initialization.
* Called at *_attach() time for each
* IOC4 with serial ports in the system.
* @idd: Master module data for this IOC4
*/
static int inline ioc4_attach_local(struct ioc4_driver_data *idd)
{
struct ioc4_port *port;
struct ioc4_port *ports[IOC4_NUM_SERIAL_PORTS];
int port_number;
uint16_t ioc4_revid_min = 62;
uint16_t ioc4_revid;
struct pci_dev *pdev = idd->idd_pdev;
struct ioc4_control* control = idd->idd_serial_data;
struct ioc4_soft *soft = control->ic_soft;
void __iomem *ioc4_misc = idd->idd_misc_regs;
void __iomem *ioc4_serial = soft->is_ioc4_serial_addr;
/* IOC4 firmware must be at least rev 62 */
pci_read_config_word(pdev, PCI_COMMAND_SPECIAL, &ioc4_revid);
printk(KERN_INFO "IOC4 firmware revision %d\n", ioc4_revid);
if (ioc4_revid < ioc4_revid_min) {
printk(KERN_WARNING
"IOC4 serial not supported on firmware rev %d, "
"please upgrade to rev %d or higher\n",
ioc4_revid, ioc4_revid_min);
return -EPERM;
}
BUG_ON(ioc4_misc == NULL);
BUG_ON(ioc4_serial == NULL);
/* Create port structures for each port */
for (port_number = 0; port_number < IOC4_NUM_SERIAL_PORTS;
port_number++) {
port = kmalloc(sizeof(struct ioc4_port), GFP_KERNEL);
if (!port) {
printk(KERN_WARNING
"IOC4 serial memory not available for port\n");
return -ENOMEM;
}
memset(port, 0, sizeof(struct ioc4_port));
/* we need to remember the previous ones, to point back to
* them farther down - setting up the ring buffers.
*/
ports[port_number] = port;
/* Allocate buffers and jumpstart the hardware. */
control->ic_port[port_number].icp_port = port;
port->ip_ioc4_soft = soft;
port->ip_pdev = pdev;
port->ip_ienb = 0;
/* Use baud rate calculations based on detected PCI
* bus speed. Simply test whether the PCI clock is
* running closer to 66MHz or 33MHz.
*/
if (idd->count_period/IOC4_EXTINT_COUNT_DIVISOR < 20) {
port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_66;
} else {
port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_33;
}
port->ip_baud = 9600;
port->ip_control = control;
port->ip_mem = ioc4_misc;
port->ip_serial = ioc4_serial;
/* point to the right hook */
port->ip_hooks = &hooks_array[port_number];
/* Get direct hooks to the serial regs and uart regs
* for this port
*/
switch (port_number) {
case 0:
port->ip_serial_regs = &(port->ip_serial->port_0);
port->ip_uart_regs = &(port->ip_serial->uart_0);
break;
case 1:
port->ip_serial_regs = &(port->ip_serial->port_1);
port->ip_uart_regs = &(port->ip_serial->uart_1);
break;
case 2:
port->ip_serial_regs = &(port->ip_serial->port_2);
port->ip_uart_regs = &(port->ip_serial->uart_2);
break;
default:
case 3:
port->ip_serial_regs = &(port->ip_serial->port_3);
port->ip_uart_regs = &(port->ip_serial->uart_3);
break;
}
/* ring buffers are 1 to a pair of ports */
if (port_number && (port_number & 1)) {
/* odd use the evens buffer */
port->ip_dma_ringbuf =
ports[port_number - 1]->ip_dma_ringbuf;
port->ip_cpu_ringbuf =
ports[port_number - 1]->ip_cpu_ringbuf;
port->ip_inring = RING(port, RX_1_OR_3);
port->ip_outring = RING(port, TX_1_OR_3);
} else {
if (port->ip_dma_ringbuf == 0) {
port->ip_cpu_ringbuf = pci_alloc_consistent
(pdev, TOTAL_RING_BUF_SIZE,
&port->ip_dma_ringbuf);
}
BUG_ON(!((((int64_t)port->ip_dma_ringbuf) &
(TOTAL_RING_BUF_SIZE - 1)) == 0));
DPRINT_CONFIG(("%s : ip_cpu_ringbuf 0x%p "
"ip_dma_ringbuf 0x%p\n",
__FUNCTION__,
(void *)port->ip_cpu_ringbuf,
(void *)port->ip_dma_ringbuf));
port->ip_inring = RING(port, RX_0_OR_2);
port->ip_outring = RING(port, TX_0_OR_2);
}
DPRINT_CONFIG(("%s : port %d [addr 0x%p] control 0x%p",
__FUNCTION__,
port_number, (void *)port, (void *)control));
DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
(void *)port->ip_serial_regs,
(void *)port->ip_uart_regs));
/* Initialize the hardware for IOC4 */
port_init(port);
DPRINT_CONFIG(("%s: port_number %d port 0x%p inring 0x%p "
"outring 0x%p\n",
__FUNCTION__,
port_number, (void *)port,
(void *)port->ip_inring,
(void *)port->ip_outring));
/* Attach interrupt handlers */
intr_connect(soft, IOC4_SIO_INTR_TYPE,
GET_SIO_IR(port_number),
handle_intr, port);
intr_connect(soft, IOC4_OTHER_INTR_TYPE,
GET_OTHER_IR(port_number),
handle_dma_error_intr, port);
}
return 0;
}
/**
* enable_intrs - enable interrupts
* @port: port to enable
* @mask: mask to use
*/
static void enable_intrs(struct ioc4_port *port, uint32_t mask)
{
struct hooks *hooks = port->ip_hooks;
if ((port->ip_ienb & mask) != mask) {
write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IES,
IOC4_SIO_INTR_TYPE);
port->ip_ienb |= mask;
}
if (port->ip_ienb)
write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
IOC4_W_IES, IOC4_OTHER_INTR_TYPE);
}
/**
* local_open - local open a port
* @port: port to open
*/
static inline int local_open(struct ioc4_port *port)
{
int spiniter = 0;
port->ip_flags = 0;
/* Pause the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
&port->ip_serial_regs->sscr);
while((readl(&port->ip_serial_regs-> sscr)
& IOC4_SSCR_PAUSE_STATE) == 0) {
spiniter++;
if (spiniter > MAXITER) {
return -1;
}
}
}
/* Reset the input fifo. If the uart received chars while the port
* was closed and DMA is not enabled, the uart may have a bunch of
* chars hanging around in its rx fifo which will not be discarded
* by rclr in the upper layer. We must get rid of them here.
*/
writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
&port->ip_uart_regs->i4u_fcr);
writeb(UART_LCR_WLEN8, &port->ip_uart_regs->i4u_lcr);
/* UART_LCR_STOP == 1 stop */
/* Re-enable DMA, set default threshold to intr whenever there is
* data available.
*/
port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
port->ip_sscr |= 1; /* default threshold */
/* Plug in the new sscr. This implicitly clears the DMA_PAUSE
* flag if it was set above
*/
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
port->ip_tx_lowat = 1;
return 0;
}
/**
* set_rx_timeout - Set rx timeout and threshold values.
* @port: port to use
* @timeout: timeout value in ticks
*/
static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
{
int threshold;
port->ip_rx_timeout = timeout;
/* Timeout is in ticks. Let's figure out how many chars we
* can receive at the current baud rate in that interval
* and set the rx threshold to that amount. There are 4 chars
* per ring entry, so we'll divide the number of chars that will
* arrive in timeout by 4.
* So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
*/
threshold = timeout * port->ip_baud / 4000;
if (threshold == 0)
threshold = 1; /* otherwise we'll intr all the time! */
if ((unsigned)threshold > (unsigned)IOC4_SSCR_RX_THRESHOLD)
return 1;
port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
port->ip_sscr |= threshold;
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
/* Now set the rx timeout to the given value
* again timeout * IOC4_SRTR_HZ / HZ
*/
timeout = timeout * IOC4_SRTR_HZ / 100;
if (timeout > IOC4_SRTR_CNT)
timeout = IOC4_SRTR_CNT;
writel(timeout, &port->ip_serial_regs->srtr);
return 0;
}
/**
* config_port - config the hardware
* @port: port to config
* @baud: baud rate for the port
* @byte_size: data size
* @stop_bits: number of stop bits
* @parenb: parity enable ?
* @parodd: odd parity ?
*/
static inline int
config_port(struct ioc4_port *port,
int baud, int byte_size, int stop_bits, int parenb, int parodd)
{
char lcr, sizebits;
int spiniter = 0;
DPRINT_CONFIG(("%s: baud %d byte_size %d stop %d parenb %d parodd %d\n",
__FUNCTION__, baud, byte_size, stop_bits, parenb, parodd));
if (set_baud(port, baud))
return 1;
switch (byte_size) {
case 5:
sizebits = UART_LCR_WLEN5;
break;
case 6:
sizebits = UART_LCR_WLEN6;
break;
case 7:
sizebits = UART_LCR_WLEN7;
break;
case 8:
sizebits = UART_LCR_WLEN8;
break;
default:
return 1;
}
/* Pause the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
&port->ip_serial_regs->sscr);
while((readl(&port->ip_serial_regs->sscr)
& IOC4_SSCR_PAUSE_STATE) == 0) {
spiniter++;
if (spiniter > MAXITER)
return -1;
}
}
/* Clear relevant fields in lcr */
lcr = readb(&port->ip_uart_regs->i4u_lcr);
lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
UART_LCR_PARITY | LCR_MASK_STOP_BITS);
/* Set byte size in lcr */
lcr |= sizebits;
/* Set parity */
if (parenb) {
lcr |= UART_LCR_PARITY;
if (!parodd)
lcr |= UART_LCR_EPAR;
}
/* Set stop bits */
if (stop_bits)
lcr |= UART_LCR_STOP /* 2 stop bits */ ;
writeb(lcr, &port->ip_uart_regs->i4u_lcr);
/* Re-enable the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
}
port->ip_baud = baud;
/* When we get within this number of ring entries of filling the
* entire ring on tx, place an EXPLICIT intr to generate a lowat
* notification when output has drained.
*/
port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
if (port->ip_tx_lowat == 0)
port->ip_tx_lowat = 1;
set_rx_timeout(port, 2);
return 0;
}
/**
* do_write - Write bytes to the port. Returns the number of bytes
* actually written. Called from transmit_chars
* @port: port to use
* @buf: the stuff to write
* @len: how many bytes in 'buf'
*/
static inline int do_write(struct ioc4_port *port, char *buf, int len)
{
int prod_ptr, cons_ptr, total = 0;
struct ring *outring;
struct ring_entry *entry;
struct hooks *hooks = port->ip_hooks;
BUG_ON(!(len >= 0));
prod_ptr = port->ip_tx_prod;
cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
outring = port->ip_outring;
/* Maintain a 1-entry red-zone. The ring buffer is full when
* (cons - prod) % ring_size is 1. Rather than do this subtraction
* in the body of the loop, I'll do it now.
*/
cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
/* Stuff the bytes into the output */
while ((prod_ptr != cons_ptr) && (len > 0)) {
int xx;
/* Get 4 bytes (one ring entry) at a time */
entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
/* Invalidate all entries */
entry->ring_allsc = 0;
/* Copy in some bytes */
for (xx = 0; (xx < 4) && (len > 0); xx++) {
entry->ring_data[xx] = *buf++;
entry->ring_sc[xx] = IOC4_TXCB_VALID;
len--;
total++;
}
/* If we are within some small threshold of filling up the
* entire ring buffer, we must place an EXPLICIT intr here
* to generate a lowat interrupt in case we subsequently
* really do fill up the ring and the caller goes to sleep.
* No need to place more than one though.
*/
if (!(port->ip_flags & LOWAT_WRITTEN) &&
((cons_ptr - prod_ptr) & PROD_CONS_MASK)
<= port->ip_tx_lowat
* (int)sizeof(struct ring_entry)) {
port->ip_flags |= LOWAT_WRITTEN;
entry->ring_sc[0] |= IOC4_TXCB_INT_WHEN_DONE;
}
/* Go on to next entry */
prod_ptr += sizeof(struct ring_entry);
prod_ptr &= PROD_CONS_MASK;
}
/* If we sent something, start DMA if necessary */
if (total > 0 && !(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
port->ip_sscr |= IOC4_SSCR_DMA_EN;
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
}
/* Store the new producer pointer. If tx is disabled, we stuff the
* data into the ring buffer, but we don't actually start tx.
*/
if (!uart_tx_stopped(port->ip_port)) {
writel(prod_ptr, &port->ip_serial_regs->stpir);
/* If we are now transmitting, enable tx_mt interrupt so we
* can disable DMA if necessary when the tx finishes.
*/
if (total > 0)
enable_intrs(port, hooks->intr_tx_mt);
}
port->ip_tx_prod = prod_ptr;
return total;
}
/**
* disable_intrs - disable interrupts
* @port: port to enable
* @mask: mask to use
*/
static void disable_intrs(struct ioc4_port *port, uint32_t mask)
{
struct hooks *hooks = port->ip_hooks;
if (port->ip_ienb & mask) {
write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IEC,
IOC4_SIO_INTR_TYPE);
port->ip_ienb &= ~mask;
}
if (!port->ip_ienb)
write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
IOC4_W_IEC, IOC4_OTHER_INTR_TYPE);
}
/**
* set_notification - Modify event notification
* @port: port to use
* @mask: events mask
* @set_on: set ?
*/
static int set_notification(struct ioc4_port *port, int mask, int set_on)
{
struct hooks *hooks = port->ip_hooks;
uint32_t intrbits, sscrbits;
BUG_ON(!mask);
intrbits = sscrbits = 0;
if (mask & N_DATA_READY)
intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
if (mask & N_OUTPUT_LOWAT)
intrbits |= hooks->intr_tx_explicit;
if (mask & N_DDCD) {
intrbits |= hooks->intr_delta_dcd;
sscrbits |= IOC4_SSCR_RX_RING_DCD;
}
if (mask & N_DCTS)
intrbits |= hooks->intr_delta_cts;
if (set_on) {
enable_intrs(port, intrbits);
port->ip_notify |= mask;
port->ip_sscr |= sscrbits;
} else {
disable_intrs(port, intrbits);
port->ip_notify &= ~mask;
port->ip_sscr &= ~sscrbits;
}
/* We require DMA if either DATA_READY or DDCD notification is
* currently requested. If neither of these is requested and
* there is currently no tx in progress, DMA may be disabled.
*/
if (port->ip_notify & (N_DATA_READY | N_DDCD))
port->ip_sscr |= IOC4_SSCR_DMA_EN;
else if (!(port->ip_ienb & hooks->intr_tx_mt))
port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
return 0;
}
/**
* set_mcr - set the master control reg
* @the_port: port to use
* @set: set ?
* @mask1: mcr mask
* @mask2: shadow mask
*/
static inline int set_mcr(struct uart_port *the_port, int set,
int mask1, int mask2)
{
struct ioc4_port *port = get_ioc4_port(the_port);
uint32_t shadow;
int spiniter = 0;
char mcr;
if (!port)
return -1;
/* Pause the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
&port->ip_serial_regs->sscr);
while ((readl(&port->ip_serial_regs->sscr)
& IOC4_SSCR_PAUSE_STATE) == 0) {
spiniter++;
if (spiniter > MAXITER)
return -1;
}
}
shadow = readl(&port->ip_serial_regs->shadow);
mcr = (shadow & 0xff000000) >> 24;
/* Set new value */
if (set) {
mcr |= mask1;
shadow |= mask2;
} else {
mcr &= ~mask1;
shadow &= ~mask2;
}
writeb(mcr, &port->ip_uart_regs->i4u_mcr);
writel(shadow, &port->ip_serial_regs->shadow);
/* Re-enable the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
}
return 0;
}
/**
* ioc4_set_proto - set the protocol for the port
* @port: port to use
* @proto: protocol to use
*/
static int ioc4_set_proto(struct ioc4_port *port, enum sio_proto proto)
{
struct hooks *hooks = port->ip_hooks;
switch (proto) {
case PROTO_RS232:
/* Clear the appropriate GIO pin */
writel(0, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
break;
case PROTO_RS422:
/* Set the appropriate GIO pin */
writel(1, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
break;
default:
return 1;
}
return 0;
}
/**
* transmit_chars - upper level write, called with ip_lock
* @the_port: port to write
*/
static void transmit_chars(struct uart_port *the_port)
{
int xmit_count, tail, head;
int result;
char *start;
struct tty_struct *tty;
struct ioc4_port *port = get_ioc4_port(the_port);
struct uart_info *info;
if (!the_port)
return;
if (!port)
return;
info = the_port->info;
tty = info->tty;
if (uart_circ_empty(&info->xmit) || uart_tx_stopped(the_port)) {
/* Nothing to do or hw stopped */
set_notification(port, N_ALL_OUTPUT, 0);
return;
}
head = info->xmit.head;
tail = info->xmit.tail;
start = (char *)&info->xmit.buf[tail];
/* write out all the data or until the end of the buffer */
xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
if (xmit_count > 0) {
result = do_write(port, start, xmit_count);
if (result > 0) {
/* booking */
xmit_count -= result;
the_port->icount.tx += result;
/* advance the pointers */
tail += result;
tail &= UART_XMIT_SIZE - 1;
info->xmit.tail = tail;
start = (char *)&info->xmit.buf[tail];
}
}
if (uart_circ_chars_pending(&info->xmit) < WAKEUP_CHARS)
uart_write_wakeup(the_port);
if (uart_circ_empty(&info->xmit)) {
set_notification(port, N_OUTPUT_LOWAT, 0);
} else {
set_notification(port, N_OUTPUT_LOWAT, 1);
}
}
/**
* ioc4_change_speed - change the speed of the port
* @the_port: port to change
* @new_termios: new termios settings
* @old_termios: old termios settings
*/
static void
ioc4_change_speed(struct uart_port *the_port,
struct termios *new_termios, struct termios *old_termios)
{
struct ioc4_port *port = get_ioc4_port(the_port);
int baud, bits;
unsigned cflag;
int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
struct uart_info *info = the_port->info;
cflag = new_termios->c_cflag;
switch (cflag & CSIZE) {
case CS5:
new_data = 5;
bits = 7;
break;
case CS6:
new_data = 6;
bits = 8;
break;
case CS7:
new_data = 7;
bits = 9;
break;
case CS8:
new_data = 8;
bits = 10;
break;
default:
/* cuz we always need a default ... */
new_data = 5;
bits = 7;
break;
}
if (cflag & CSTOPB) {
bits++;
new_stop = 1;
}
if (cflag & PARENB) {
bits++;
new_parity_enable = 1;
if (cflag & PARODD)
new_parity = 1;
}
baud = uart_get_baud_rate(the_port, new_termios, old_termios,
MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
DPRINT_CONFIG(("%s: returned baud %d\n", __FUNCTION__, baud));
/* default is 9600 */
if (!baud)
baud = 9600;
if (!the_port->fifosize)
the_port->fifosize = IOC4_MAX_CHARS;
the_port->timeout = ((the_port->fifosize * HZ * bits) / (baud / 10));
the_port->timeout += HZ / 50; /* Add .02 seconds of slop */
the_port->ignore_status_mask = N_ALL_INPUT;
if (I_IGNPAR(info->tty))
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
| N_FRAMING_ERROR);
if (I_IGNBRK(info->tty)) {
the_port->ignore_status_mask &= ~N_BREAK;
if (I_IGNPAR(info->tty))
the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
}
if (!(cflag & CREAD)) {
/* ignore everything */
the_port->ignore_status_mask &= ~N_DATA_READY;
}
if (cflag & CRTSCTS) {
info->flags |= ASYNC_CTS_FLOW;
port->ip_sscr |= IOC4_SSCR_HFC_EN;
}
else {
info->flags &= ~ASYNC_CTS_FLOW;
port->ip_sscr &= ~IOC4_SSCR_HFC_EN;
}
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
/* Set the configuration and proper notification call */
DPRINT_CONFIG(("%s : port 0x%p cflag 0%o "
"config_port(baud %d data %d stop %d p enable %d parity %d),"
" notification 0x%x\n",
__FUNCTION__, (void *)port, cflag, baud, new_data, new_stop,
new_parity_enable, new_parity, the_port->ignore_status_mask));
if ((config_port(port, baud, /* baud */
new_data, /* byte size */
new_stop, /* stop bits */
new_parity_enable, /* set parity */
new_parity)) >= 0) { /* parity 1==odd */
set_notification(port, the_port->ignore_status_mask, 1);
}
}
/**
* ic4_startup_local - Start up the serial port - returns >= 0 if no errors
* @the_port: Port to operate on
*/
static inline int ic4_startup_local(struct uart_port *the_port)
{
int retval = 0;
struct ioc4_port *port;
struct uart_info *info;
if (!the_port)
return -1;
port = get_ioc4_port(the_port);
if (!port)
return -1;
info = the_port->info;
if (info->flags & UIF_INITIALIZED) {
return retval;
}
if (info->tty) {
set_bit(TTY_IO_ERROR, &info->tty->flags);
clear_bit(TTY_IO_ERROR, &info->tty->flags);
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
local_open(port);
/* set the speed of the serial port */
ioc4_change_speed(the_port, info->tty->termios, (struct termios *)0);
info->flags |= UIF_INITIALIZED;
return 0;
}
/*
* ioc4_cb_output_lowat - called when the output low water mark is hit
* @port: port to output
*/
static void ioc4_cb_output_lowat(struct ioc4_port *port)
{
/* ip_lock is set on the call here */
if (port->ip_port) {
transmit_chars(port->ip_port);
}
}
/**
* handle_intr - service any interrupts for the given port - 2nd level
* called via sd_intr
* @arg: handler arg
* @sio_ir: ioc4regs
*/
static void handle_intr(void *arg, uint32_t sio_ir)
{
struct ioc4_port *port = (struct ioc4_port *)arg;
struct hooks *hooks = port->ip_hooks;
unsigned int rx_high_rd_aborted = 0;
unsigned int flags;
struct uart_port *the_port;
int loop_counter;
/* Possible race condition here: The tx_mt interrupt bit may be
* cleared without the intervention of the interrupt handler,
* e.g. by a write. If the top level interrupt handler reads a
* tx_mt, then some other processor does a write, starting up
* output, then we come in here, see the tx_mt and stop DMA, the
* output started by the other processor will hang. Thus we can
* only rely on tx_mt being legitimate if it is read while the
* port lock is held. Therefore this bit must be ignored in the
* passed in interrupt mask which was read by the top level
* interrupt handler since the port lock was not held at the time
* it was read. We can only rely on this bit being accurate if it
* is read while the port lock is held. So we'll clear it for now,
* and reload it later once we have the port lock.
*/
sio_ir &= ~(hooks->intr_tx_mt);
spin_lock_irqsave(&port->ip_lock, flags);
loop_counter = MAXITER; /* to avoid hangs */
do {
uint32_t shadow;
if ( loop_counter-- <= 0 ) {
printk(KERN_WARNING "IOC4 serial: "
"possible hang condition/"
"port stuck on interrupt.\n");
break;
}
/* Handle a DCD change */
if (sio_ir & hooks->intr_delta_dcd) {
/* ACK the interrupt */
writel(hooks->intr_delta_dcd,
&port->ip_mem->sio_ir.raw);
shadow = readl(&port->ip_serial_regs->shadow);
if ((port->ip_notify & N_DDCD)
&& (shadow & IOC4_SHADOW_DCD)
&& (port->ip_port)) {
the_port = port->ip_port;
the_port->icount.dcd = 1;
wake_up_interruptible
(&the_port-> info->delta_msr_wait);
} else if ((port->ip_notify & N_DDCD)
&& !(shadow & IOC4_SHADOW_DCD)) {
/* Flag delta DCD/no DCD */
port->ip_flags |= DCD_ON;
}
}
/* Handle a CTS change */
if (sio_ir & hooks->intr_delta_cts) {
/* ACK the interrupt */
writel(hooks->intr_delta_cts,
&port->ip_mem->sio_ir.raw);
shadow = readl(&port->ip_serial_regs->shadow);
if ((port->ip_notify & N_DCTS)
&& (port->ip_port)) {
the_port = port->ip_port;
the_port->icount.cts =
(shadow & IOC4_SHADOW_CTS) ? 1 : 0;
wake_up_interruptible
(&the_port->info->delta_msr_wait);
}
}
/* rx timeout interrupt. Must be some data available. Put this
* before the check for rx_high since servicing this condition
* may cause that condition to clear.
*/
if (sio_ir & hooks->intr_rx_timer) {
/* ACK the interrupt */
writel(hooks->intr_rx_timer,
&port->ip_mem->sio_ir.raw);
if ((port->ip_notify & N_DATA_READY)
&& (port->ip_port)) {
/* ip_lock is set on call here */
receive_chars(port->ip_port);
}
}
/* rx high interrupt. Must be after rx_timer. */
else if (sio_ir & hooks->intr_rx_high) {
/* Data available, notify upper layer */
if ((port->ip_notify & N_DATA_READY)
&& port->ip_port) {
/* ip_lock is set on call here */
receive_chars(port->ip_port);
}
/* We can't ACK this interrupt. If receive_chars didn't
* cause the condition to clear, we'll have to disable
* the interrupt until the data is drained.
* If the read was aborted, don't disable the interrupt
* as this may cause us to hang indefinitely. An
* aborted read generally means that this interrupt
* hasn't been delivered to the cpu yet anyway, even
* though we see it as asserted when we read the sio_ir.
*/
if ((sio_ir = PENDING(port)) & hooks->intr_rx_high) {
if ((port->ip_flags & READ_ABORTED) == 0) {
port->ip_ienb &= ~hooks->intr_rx_high;
port->ip_flags |= INPUT_HIGH;
} else {
rx_high_rd_aborted++;
}
}
}
/* We got a low water interrupt: notify upper layer to
* send more data. Must come before tx_mt since servicing
* this condition may cause that condition to clear.
*/
if (sio_ir & hooks->intr_tx_explicit) {
port->ip_flags &= ~LOWAT_WRITTEN;
/* ACK the interrupt */
writel(hooks->intr_tx_explicit,
&port->ip_mem->sio_ir.raw);
if (port->ip_notify & N_OUTPUT_LOWAT)
ioc4_cb_output_lowat(port);
}
/* Handle tx_mt. Must come after tx_explicit. */
else if (sio_ir & hooks->intr_tx_mt) {
/* If we are expecting a lowat notification
* and we get to this point it probably means that for
* some reason the tx_explicit didn't work as expected
* (that can legitimately happen if the output buffer is
* filled up in just the right way).
* So send the notification now.
*/
if (port->ip_notify & N_OUTPUT_LOWAT) {
ioc4_cb_output_lowat(port);
/* We need to reload the sio_ir since the lowat
* call may have caused another write to occur,
* clearing the tx_mt condition.
*/
sio_ir = PENDING(port);
}
/* If the tx_mt condition still persists even after the
* lowat call, we've got some work to do.
*/
if (sio_ir & hooks->intr_tx_mt) {
/* If we are not currently expecting DMA input,
* and the transmitter has just gone idle,
* there is no longer any reason for DMA, so
* disable it.
*/
if (!(port->ip_notify
& (N_DATA_READY | N_DDCD))) {
BUG_ON(!(port->ip_sscr
& IOC4_SSCR_DMA_EN));
port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
writel(port->ip_sscr,
&port->ip_serial_regs->sscr);
}
/* Prevent infinite tx_mt interrupt */
port->ip_ienb &= ~hooks->intr_tx_mt;
}
}
sio_ir = PENDING(port);
/* if the read was aborted and only hooks->intr_rx_high,
* clear hooks->intr_rx_high, so we do not loop forever.
*/
if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
sio_ir &= ~hooks->intr_rx_high;
}
} while (sio_ir & hooks->intr_all);
spin_unlock_irqrestore(&port->ip_lock, flags);
/* Re-enable interrupts before returning from interrupt handler.
* Getting interrupted here is okay. It'll just v() our semaphore, and
* we'll come through the loop again.
*/
write_ireg(port->ip_ioc4_soft, port->ip_ienb, IOC4_W_IES,
IOC4_SIO_INTR_TYPE);
}
/*
* ioc4_cb_post_ncs - called for some basic errors
* @port: port to use
* @ncs: event
*/
static void ioc4_cb_post_ncs(struct uart_port *the_port, int ncs)
{
struct uart_icount *icount;
icount = &the_port->icount;
if (ncs & NCS_BREAK)
icount->brk++;
if (ncs & NCS_FRAMING)
icount->frame++;
if (ncs & NCS_OVERRUN)
icount->overrun++;
if (ncs & NCS_PARITY)
icount->parity++;
}
/**
* do_read - Read in bytes from the port. Return the number of bytes
* actually read.
* @the_port: port to use
* @buf: place to put the stuff we read
* @len: how big 'buf' is
*/
static inline int do_read(struct uart_port *the_port, unsigned char *buf,
int len)
{
int prod_ptr, cons_ptr, total;
struct ioc4_port *port = get_ioc4_port(the_port);
struct ring *inring;
struct ring_entry *entry;
struct hooks *hooks = port->ip_hooks;
int byte_num;
char *sc;
int loop_counter;
BUG_ON(!(len >= 0));
BUG_ON(!port);
/* There is a nasty timing issue in the IOC4. When the rx_timer
* expires or the rx_high condition arises, we take an interrupt.
* At some point while servicing the interrupt, we read bytes from
* the ring buffer and re-arm the rx_timer. However the rx_timer is
* not started until the first byte is received *after* it is armed,
* and any bytes pending in the rx construction buffers are not drained
* to memory until either there are 4 bytes available or the rx_timer
* expires. This leads to a potential situation where data is left
* in the construction buffers forever - 1 to 3 bytes were received
* after the interrupt was generated but before the rx_timer was
* re-armed. At that point as long as no subsequent bytes are received
* the timer will never be started and the bytes will remain in the
* construction buffer forever. The solution is to execute a DRAIN
* command after rearming the timer. This way any bytes received before
* the DRAIN will be drained to memory, and any bytes received after
* the DRAIN will start the TIMER and be drained when it expires.
* Luckily, this only needs to be done when the DMA buffer is empty
* since there is no requirement that this function return all
* available data as long as it returns some.
*/
/* Re-arm the timer */
writel(port->ip_rx_cons | IOC4_SRCIR_ARM,
&port->ip_serial_regs->srcir);
prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
cons_ptr = port->ip_rx_cons;
if (prod_ptr == cons_ptr) {
int reset_dma = 0;
/* Input buffer appears empty, do a flush. */
/* DMA must be enabled for this to work. */
if (!(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
port->ip_sscr |= IOC4_SSCR_DMA_EN;
reset_dma = 1;
}
/* Potential race condition: we must reload the srpir after
* issuing the drain command, otherwise we could think the rx
* buffer is empty, then take a very long interrupt, and when
* we come back it's full and we wait forever for the drain to
* complete.
*/
writel(port->ip_sscr | IOC4_SSCR_RX_DRAIN,
&port->ip_serial_regs->sscr);
prod_ptr = readl(&port->ip_serial_regs->srpir)
& PROD_CONS_MASK;
/* We must not wait for the DRAIN to complete unless there are
* at least 8 bytes (2 ring entries) available to receive the
* data otherwise the DRAIN will never complete and we'll
* deadlock here.
* In fact, to make things easier, I'll just ignore the flush if
* there is any data at all now available.
*/
if (prod_ptr == cons_ptr) {
loop_counter = 0;
while (readl(&port->ip_serial_regs->sscr) &
IOC4_SSCR_RX_DRAIN) {
loop_counter++;
if (loop_counter > MAXITER)
return -1;
}
/* SIGH. We have to reload the prod_ptr *again* since
* the drain may have caused it to change
*/
prod_ptr = readl(&port->ip_serial_regs->srpir)
& PROD_CONS_MASK;
}
if (reset_dma) {
port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
writel(port->ip_sscr, &port->ip_serial_regs->sscr);
}
}
inring = port->ip_inring;
port->ip_flags &= ~READ_ABORTED;
total = 0;
loop_counter = 0xfffff; /* to avoid hangs */
/* Grab bytes from the hardware */
while ((prod_ptr != cons_ptr) && (len > 0)) {
entry = (struct ring_entry *)((caddr_t)inring + cons_ptr);
if ( loop_counter-- <= 0 ) {
printk(KERN_WARNING "IOC4 serial: "
"possible hang condition/"
"port stuck on read.\n");
break;
}
/* According to the producer pointer, this ring entry
* must contain some data. But if the PIO happened faster
* than the DMA, the data may not be available yet, so let's
* wait until it arrives.
*/
if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
/* Indicate the read is aborted so we don't disable
* the interrupt thinking that the consumer is
* congested.
*/
port->ip_flags |= READ_ABORTED;
len = 0;
break;
}
/* Load the bytes/status out of the ring entry */
for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
sc = &(entry->ring_sc[byte_num]);
/* Check for change in modem state or overrun */
if ((*sc & IOC4_RXSB_MODEM_VALID)
&& (port->ip_notify & N_DDCD)) {
/* Notify upper layer if DCD dropped */
if ((port->ip_flags & DCD_ON)
&& !(*sc & IOC4_RXSB_DCD)) {
/* If we have already copied some data,
* return it. We'll pick up the carrier
* drop on the next pass. That way we
* don't throw away the data that has
* already been copied back to
* the caller's buffer.
*/
if (total > 0) {
len = 0;
break;
}
port->ip_flags &= ~DCD_ON;
/* Turn off this notification so the
* carrier drop protocol won't see it
* again when it does a read.
*/
*sc &= ~IOC4_RXSB_MODEM_VALID;
/* To keep things consistent, we need
* to update the consumer pointer so
* the next reader won't come in and
* try to read the same ring entries
* again. This must be done here before
* the dcd change.
*/
if ((entry->ring_allsc & RING_ANY_VALID)
== 0) {
cons_ptr += (int)sizeof
(struct ring_entry);
cons_ptr &= PROD_CONS_MASK;
}
writel(cons_ptr,
&port->ip_serial_regs->srcir);
port->ip_rx_cons = cons_ptr;
/* Notify upper layer of carrier drop */
if ((port->ip_notify & N_DDCD)
&& port->ip_port) {
the_port->icount.dcd = 0;
wake_up_interruptible
(&the_port->info->
delta_msr_wait);
}
/* If we had any data to return, we
* would have returned it above.
*/
return 0;
}
}
if (*sc & IOC4_RXSB_MODEM_VALID) {
/* Notify that an input overrun occurred */
if ((*sc & IOC4_RXSB_OVERRUN)
&& (port->ip_notify & N_OVERRUN_ERROR)) {
ioc4_cb_post_ncs(the_port, NCS_OVERRUN);
}
/* Don't look at this byte again */
*sc &= ~IOC4_RXSB_MODEM_VALID;
}
/* Check for valid data or RX errors */
if ((*sc & IOC4_RXSB_DATA_VALID) &&
((*sc & (IOC4_RXSB_PAR_ERR
| IOC4_RXSB_FRAME_ERR
| IOC4_RXSB_BREAK))
&& (port->ip_notify & (N_PARITY_ERROR
| N_FRAMING_ERROR
| N_BREAK)))) {
/* There is an error condition on the next byte.
* If we have already transferred some bytes,
* we'll stop here. Otherwise if this is the
* first byte to be read, we'll just transfer
* it alone after notifying the
* upper layer of its status.
*/
if (total > 0) {
len = 0;
break;
} else {
if ((*sc & IOC4_RXSB_PAR_ERR) &&
(port->ip_notify & N_PARITY_ERROR)) {
ioc4_cb_post_ncs(the_port,
NCS_PARITY);
}
if ((*sc & IOC4_RXSB_FRAME_ERR) &&
(port->ip_notify & N_FRAMING_ERROR)){
ioc4_cb_post_ncs(the_port,
NCS_FRAMING);
}
if ((*sc & IOC4_RXSB_BREAK)
&& (port->ip_notify & N_BREAK)) {
ioc4_cb_post_ncs
(the_port,
NCS_BREAK);
}
len = 1;
}
}
if (*sc & IOC4_RXSB_DATA_VALID) {
*sc &= ~IOC4_RXSB_DATA_VALID;
*buf = entry->ring_data[byte_num];
buf++;
len--;
total++;
}
}
/* If we used up this entry entirely, go on to the next one,
* otherwise we must have run out of buffer space, so
* leave the consumer pointer here for the next read in case
* there are still unread bytes in this entry.
*/
if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
cons_ptr += (int)sizeof(struct ring_entry);
cons_ptr &= PROD_CONS_MASK;
}
}
/* Update consumer pointer and re-arm rx timer interrupt */
writel(cons_ptr, &port->ip_serial_regs->srcir);
port->ip_rx_cons = cons_ptr;
/* If we have now dipped below the rx high water mark and we have
* rx_high interrupt turned off, we can now turn it back on again.
*/
if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
& PROD_CONS_MASK) < ((port->ip_sscr &
IOC4_SSCR_RX_THRESHOLD)
<< IOC4_PROD_CONS_PTR_OFF))) {
port->ip_flags &= ~INPUT_HIGH;
enable_intrs(port, hooks->intr_rx_high);
}
return total;
}
/**
* receive_chars - upper level read. Called with ip_lock.
* @the_port: port to read from
*/
static void receive_chars(struct uart_port *the_port)
{
struct tty_struct *tty;
unsigned char ch[IOC4_MAX_CHARS];
int read_count, request_count;
struct uart_icount *icount;
struct uart_info *info = the_port->info;
/* Make sure all the pointers are "good" ones */
if (!info)
return;
if (!info->tty)
return;
tty = info->tty;
request_count = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
if (request_count > 0) {
if (request_count > IOC4_MAX_CHARS - 2)
request_count = IOC4_MAX_CHARS - 2;
icount = &the_port->icount;
read_count = do_read(the_port, ch, request_count);
if (read_count > 0) {
memcpy(tty->flip.char_buf_ptr, ch, read_count);
memset(tty->flip.flag_buf_ptr, TTY_NORMAL, read_count);
tty->flip.char_buf_ptr += read_count;
tty->flip.flag_buf_ptr += read_count;
tty->flip.count += read_count;
icount->rx += read_count;
}
}
tty_flip_buffer_push(tty);
}
/**
* ic4_type - What type of console are we?
* @port: Port to operate with (we ignore since we only have one port)
*
*/
static const char *ic4_type(struct uart_port *the_port)
{
return "SGI IOC4 Serial";
}
/**
* ic4_tx_empty - Is the transmitter empty? We pretend we're always empty
* @port: Port to operate on (we ignore since we always return 1)
*
*/
static unsigned int ic4_tx_empty(struct uart_port *the_port)
{
return 1;
}
/**
* ic4_stop_tx - stop the transmitter
* @port: Port to operate on
*
*/
static void ic4_stop_tx(struct uart_port *the_port)
{
}
/**
* null_void_function -
* @port: Port to operate on
*
*/
static void null_void_function(struct uart_port *the_port)
{
}
/**
* ic4_shutdown - shut down the port - free irq and disable
* @port: Port to shut down
*
*/
static void ic4_shutdown(struct uart_port *the_port)
{
unsigned long port_flags;
struct ioc4_port *port;
struct uart_info *info;
port = get_ioc4_port(the_port);
if (!port)
return;
info = the_port->info;
if (!(info->flags & UIF_INITIALIZED))
return;
wake_up_interruptible(&info->delta_msr_wait);
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
spin_lock_irqsave(&port->ip_lock, port_flags);
set_notification(port, N_ALL, 0);
info->flags &= ~UIF_INITIALIZED;
spin_unlock_irqrestore(&port->ip_lock, port_flags);
}
/**
* ic4_set_mctrl - set control lines (dtr, rts, etc)
* @port: Port to operate on
* @mctrl: Lines to set/unset
*
*/
static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
{
unsigned char mcr = 0;
if (mctrl & TIOCM_RTS)
mcr |= UART_MCR_RTS;
if (mctrl & TIOCM_DTR)
mcr |= UART_MCR_DTR;
if (mctrl & TIOCM_OUT1)
mcr |= UART_MCR_OUT1;
if (mctrl & TIOCM_OUT2)
mcr |= UART_MCR_OUT2;
if (mctrl & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
set_mcr(the_port, 1, mcr, IOC4_SHADOW_DTR);
}
/**
* ic4_get_mctrl - get control line info
* @port: port to operate on
*
*/
static unsigned int ic4_get_mctrl(struct uart_port *the_port)
{
struct ioc4_port *port = get_ioc4_port(the_port);
uint32_t shadow;
unsigned int ret = 0;
if (!port)
return 0;
shadow = readl(&port->ip_serial_regs->shadow);
if (shadow & IOC4_SHADOW_DCD)
ret |= TIOCM_CAR;
if (shadow & IOC4_SHADOW_DR)
ret |= TIOCM_DSR;
if (shadow & IOC4_SHADOW_CTS)
ret |= TIOCM_CTS;
return ret;
}
/**
* ic4_start_tx - Start transmitter, flush any output
* @port: Port to operate on
*
*/
static void ic4_start_tx(struct uart_port *the_port)
{
struct ioc4_port *port = get_ioc4_port(the_port);
unsigned long flags;
if (port) {
spin_lock_irqsave(&port->ip_lock, flags);
transmit_chars(the_port);
spin_unlock_irqrestore(&port->ip_lock, flags);
}
}
/**
* ic4_break_ctl - handle breaks
* @port: Port to operate on
* @break_state: Break state
*
*/
static void ic4_break_ctl(struct uart_port *the_port, int break_state)
{
}
/**
* ic4_startup - Start up the serial port - always return 0 (We're always on)
* @port: Port to operate on
*
*/
static int ic4_startup(struct uart_port *the_port)
{
int retval;
struct ioc4_port *port;
struct ioc4_control *control;
struct uart_info *info;
unsigned long port_flags;
if (!the_port) {
return -ENODEV;
}
port = get_ioc4_port(the_port);
if (!port) {
return -ENODEV;
}
info = the_port->info;
control = port->ip_control;
if (!control) {
return -ENODEV;
}
/* Start up the serial port */
spin_lock_irqsave(&port->ip_lock, port_flags);
retval = ic4_startup_local(the_port);
spin_unlock_irqrestore(&port->ip_lock, port_flags);
return retval;
}
/**
* ic4_set_termios - set termios stuff
* @port: port to operate on
* @termios: New settings
* @termios: Old
*
*/
static void
ic4_set_termios(struct uart_port *the_port,
struct termios *termios, struct termios *old_termios)
{
struct ioc4_port *port = get_ioc4_port(the_port);
unsigned long port_flags;
spin_lock_irqsave(&port->ip_lock, port_flags);
ioc4_change_speed(the_port, termios, old_termios);
spin_unlock_irqrestore(&port->ip_lock, port_flags);
}
/**
* ic4_request_port - allocate resources for port - no op....
* @port: port to operate on
*
*/
static int ic4_request_port(struct uart_port *port)
{
return 0;
}
/* Associate the uart functions above - given to serial core */
static struct uart_ops ioc4_ops = {
.tx_empty = ic4_tx_empty,
.set_mctrl = ic4_set_mctrl,
.get_mctrl = ic4_get_mctrl,
.stop_tx = ic4_stop_tx,
.start_tx = ic4_start_tx,
.stop_rx = null_void_function,
.enable_ms = null_void_function,
.break_ctl = ic4_break_ctl,
.startup = ic4_startup,
.shutdown = ic4_shutdown,
.set_termios = ic4_set_termios,
.type = ic4_type,
.release_port = null_void_function,
.request_port = ic4_request_port,
};
/*
* Boot-time initialization code
*/
static struct uart_driver ioc4_uart = {
.owner = THIS_MODULE,
.driver_name = "ioc4_serial",
.dev_name = DEVICE_NAME,
.major = DEVICE_MAJOR,
.minor = DEVICE_MINOR,
.nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
};
/**
* ioc4_serial_core_attach - register with serial core
* This is done during pci probing
* @pdev: handle for this card
*/
static inline int
ioc4_serial_core_attach(struct pci_dev *pdev)
{
struct ioc4_port *port;
struct uart_port *the_port;
struct ioc4_driver_data *idd = pci_get_drvdata(pdev);
struct ioc4_control *control = idd->idd_serial_data;
int ii;
DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n",
__FUNCTION__, pdev, (void *)control));
if (!control)
return -ENODEV;
/* once around for each port on this card */
for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
the_port = &control->ic_port[ii].icp_uart_port;
port = control->ic_port[ii].icp_port;
port->ip_port = the_port;
DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p\n",
__FUNCTION__, (void *)the_port,
(void *)port));
spin_lock_init(&the_port->lock);
/* membase, iobase and mapbase just need to be non-0 */
the_port->membase = (unsigned char __iomem *)1;
the_port->line = the_port->iobase = ii;
the_port->mapbase = 1;
the_port->type = PORT_16550A;
the_port->fifosize = IOC4_MAX_CHARS;
the_port->ops = &ioc4_ops;
the_port->irq = control->ic_irq;
the_port->dev = &pdev->dev;
if (uart_add_one_port(&ioc4_uart, the_port) < 0) {
printk(KERN_WARNING
"%s: unable to add port %d\n",
__FUNCTION__, the_port->line);
} else {
DPRINT_CONFIG(
("IOC4 serial driver port %d irq = %d\n",
the_port->line, the_port->irq));
}
/* all ports are rs232 for now */
ioc4_set_proto(port, PROTO_RS232);
}
return 0;
}
/**
* ioc4_serial_attach_one - register attach function
* called per card found from IOC4 master module.
* @idd: Master module data for this IOC4
*/
int
ioc4_serial_attach_one(struct ioc4_driver_data *idd)
{
unsigned long tmp_addr1;
struct ioc4_serial __iomem *serial;
struct ioc4_soft *soft;
struct ioc4_control *control;
int ret = 0;
DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __FUNCTION__, idd->idd_pdev, idd->idd_pci_id));
/* request serial registers */
tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET;
if (!request_region(tmp_addr1, sizeof(struct ioc4_serial),
"sioc4_uart")) {
printk(KERN_WARNING
"ioc4 (%p): unable to get request region for "
"uart space\n", (void *)idd->idd_pdev);
ret = -ENODEV;
goto out1;
}
serial = ioremap(tmp_addr1, sizeof(struct ioc4_serial));
if (!serial) {
printk(KERN_WARNING
"ioc4 (%p) : unable to remap ioc4 serial register\n",
(void *)idd->idd_pdev);
ret = -ENODEV;
goto out2;
}
DPRINT_CONFIG(("%s : mem 0x%p, serial 0x%p\n",
__FUNCTION__, (void *)idd->idd_misc_regs, (void *)serial));
/* Get memory for the new card */
control = kmalloc(sizeof(struct ioc4_control) * IOC4_NUM_SERIAL_PORTS,
GFP_KERNEL);
if (!control) {
printk(KERN_WARNING "ioc4_attach_one"
": unable to get memory for the IOC4\n");
ret = -ENOMEM;
goto out2;
}
memset(control, 0, sizeof(struct ioc4_control));
idd->idd_serial_data = control;
/* Allocate the soft structure */
soft = kmalloc(sizeof(struct ioc4_soft), GFP_KERNEL);
if (!soft) {
printk(KERN_WARNING
"ioc4 (%p): unable to get memory for the soft struct\n",
(void *)idd->idd_pdev);
ret = -ENOMEM;
goto out3;
}
memset(soft, 0, sizeof(struct ioc4_soft));
spin_lock_init(&soft->is_ir_lock);
soft->is_ioc4_misc_addr = idd->idd_misc_regs;
soft->is_ioc4_serial_addr = serial;
/* Init the IOC4 */
writel(0xf << IOC4_SIO_CR_CMD_PULSE_SHIFT,
&idd->idd_misc_regs->sio_cr.raw);
/* Enable serial port mode select generic PIO pins as outputs */
writel(IOC4_GPCR_UART0_MODESEL | IOC4_GPCR_UART1_MODESEL
| IOC4_GPCR_UART2_MODESEL | IOC4_GPCR_UART3_MODESEL,
&idd->idd_misc_regs->gpcr_s.raw);
/* Clear and disable all serial interrupts */
write_ireg(soft, ~0, IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
writel(~0, &idd->idd_misc_regs->sio_ir.raw);
write_ireg(soft, IOC4_OTHER_IR_SER_MEMERR, IOC4_W_IEC,
IOC4_OTHER_INTR_TYPE);
writel(IOC4_OTHER_IR_SER_MEMERR, &idd->idd_misc_regs->other_ir.raw);
control->ic_soft = soft;
/* Hook up interrupt handler */
if (!request_irq(idd->idd_pdev->irq, ioc4_intr, SA_SHIRQ,
"sgi-ioc4serial", (void *)soft)) {
control->ic_irq = idd->idd_pdev->irq;
} else {
printk(KERN_WARNING
"%s : request_irq fails for IRQ 0x%x\n ",
__FUNCTION__, idd->idd_pdev->irq);
}
ret = ioc4_attach_local(idd);
if (ret)
goto out4;
/* register port with the serial core */
if ((ret = ioc4_serial_core_attach(idd->idd_pdev)))
goto out4;
return ret;
/* error exits that give back resources */
out4:
kfree(soft);
out3:
kfree(control);
out2:
release_region(tmp_addr1, sizeof(struct ioc4_serial));
out1:
return ret;
}
/**
* ioc4_serial_remove_one - detach function
*
* @idd: IOC4 master module data for this IOC4
*/
int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
{
int ii;
struct ioc4_control *control;
struct uart_port *the_port;
struct ioc4_port *port;
struct ioc4_soft *soft;
control = idd->idd_serial_data;
for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
the_port = &control->ic_port[ii].icp_uart_port;
if (the_port) {
uart_remove_one_port(&ioc4_uart, the_port);
}
port = control->ic_port[ii].icp_port;
if (!(ii & 1) && port) {
pci_free_consistent(port->ip_pdev,
TOTAL_RING_BUF_SIZE,
(void *)port->ip_cpu_ringbuf,
port->ip_dma_ringbuf);
kfree(port);
}
}
soft = control->ic_soft;
if (soft) {
free_irq(control->ic_irq, (void *)soft);
if (soft->is_ioc4_serial_addr) {
release_region((unsigned long)
soft->is_ioc4_serial_addr,
sizeof(struct ioc4_serial));
}
kfree(soft);
}
kfree(control);
idd->idd_serial_data = NULL;
return 0;
}
static struct ioc4_submodule ioc4_serial_submodule = {
.is_name = "IOC4_serial",
.is_owner = THIS_MODULE,
.is_probe = ioc4_serial_attach_one,
.is_remove = ioc4_serial_remove_one,
};
/**
* ioc4_serial_init - module init
*/
int ioc4_serial_init(void)
{
int ret;
/* register with serial core */
if ((ret = uart_register_driver(&ioc4_uart)) < 0) {
printk(KERN_WARNING
"%s: Couldn't register IOC4 serial driver\n",
__FUNCTION__);
return ret;
}
/* register with IOC4 main module */
return ioc4_register_submodule(&ioc4_serial_submodule);
}
static void __devexit ioc4_serial_exit(void)
{
ioc4_unregister_submodule(&ioc4_serial_submodule);
uart_unregister_driver(&ioc4_uart);
}
module_init(ioc4_serial_init);
module_exit(ioc4_serial_exit);
MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC4 Base-IO Card");
MODULE_LICENSE("GPL");
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