linux_dsm_epyc7002/drivers/tty/serial/mpc52xx_uart.c

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/*
* Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
*
* FIXME According to the usermanual the status bits in the status register
* are only updated when the peripherals access the FIFO and not when the
* CPU access them. So since we use this bits to know when we stop writing
* and reading, they may not be updated in-time and a race condition may
* exists. But I haven't be able to prove this and I don't care. But if
* any problem arises, it might worth checking. The TX/RX FIFO Stats
* registers should be used in addition.
* Update: Actually, they seem updated ... At least the bits we use.
*
*
* Maintainer : Sylvain Munaut <tnt@246tNt.com>
*
* Some of the code has been inspired/copied from the 2.4 code written
* by Dale Farnsworth <dfarnsworth@mvista.com>.
*
* Copyright (C) 2008 Freescale Semiconductor Inc.
* John Rigby <jrigby@gmail.com>
* Added support for MPC5121
* Copyright (C) 2006 Secret Lab Technologies Ltd.
* Grant Likely <grant.likely@secretlab.ca>
* Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2003 MontaVista, Software, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#undef DEBUG
#include <linux/device.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>
#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_PSC_MAJOR 204
#define SERIAL_PSC_MINOR 148
#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
/* Rem: - We use the read_status_mask as a shadow of
* psc->mpc52xx_psc_imr
* - It's important that is array is all zero on start as we
* use it to know if it's initialized or not ! If it's not sure
* it's cleared, then a memset(...,0,...) should be added to
* the console_init
*/
/* lookup table for matching device nodes to index numbers */
static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
static void mpc52xx_uart_of_enumerate(void);
#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
/* Forward declaration of the interruption handling routine */
static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
/* ======================================================================== */
/* PSC fifo operations for isolating differences between 52xx and 512x */
/* ======================================================================== */
struct psc_ops {
void (*fifo_init)(struct uart_port *port);
int (*raw_rx_rdy)(struct uart_port *port);
int (*raw_tx_rdy)(struct uart_port *port);
int (*rx_rdy)(struct uart_port *port);
int (*tx_rdy)(struct uart_port *port);
int (*tx_empty)(struct uart_port *port);
void (*stop_rx)(struct uart_port *port);
void (*start_tx)(struct uart_port *port);
void (*stop_tx)(struct uart_port *port);
void (*rx_clr_irq)(struct uart_port *port);
void (*tx_clr_irq)(struct uart_port *port);
void (*write_char)(struct uart_port *port, unsigned char c);
unsigned char (*read_char)(struct uart_port *port);
void (*cw_disable_ints)(struct uart_port *port);
void (*cw_restore_ints)(struct uart_port *port);
unsigned int (*set_baudrate)(struct uart_port *port,
struct ktermios *new,
struct ktermios *old);
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
int (*clock_alloc)(struct uart_port *port);
void (*clock_relse)(struct uart_port *port);
int (*clock)(struct uart_port *port, int enable);
int (*fifoc_init)(void);
void (*fifoc_uninit)(void);
void (*get_irq)(struct uart_port *, struct device_node *);
irqreturn_t (*handle_irq)(struct uart_port *port);
u16 (*get_status)(struct uart_port *port);
u8 (*get_ipcr)(struct uart_port *port);
void (*command)(struct uart_port *port, u8 cmd);
void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
void (*set_rts)(struct uart_port *port, int state);
void (*enable_ms)(struct uart_port *port);
void (*set_sicr)(struct uart_port *port, u32 val);
void (*set_imr)(struct uart_port *port, u16 val);
u8 (*get_mr1)(struct uart_port *port);
};
/* setting the prescaler and divisor reg is common for all chips */
static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
u16 prescaler, unsigned int divisor)
{
/* select prescaler */
out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
out_8(&psc->ctur, divisor >> 8);
out_8(&psc->ctlr, divisor & 0xff);
}
static u16 mpc52xx_psc_get_status(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_status);
}
static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
{
return in_8(&PSC(port)->mpc52xx_psc_ipcr);
}
static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
{
out_8(&PSC(port)->command, cmd);
}
static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
{
out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
out_8(&PSC(port)->mode, mr1);
out_8(&PSC(port)->mode, mr2);
}
static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
{
if (state)
out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
else
out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
}
static void mpc52xx_psc_enable_ms(struct uart_port *port)
{
struct mpc52xx_psc __iomem *psc = PSC(port);
/* clear D_*-bits by reading them */
in_8(&psc->mpc52xx_psc_ipcr);
/* enable CTS and DCD as IPC interrupts */
out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
}
static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
{
out_be32(&PSC(port)->sicr, val);
}
static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
{
out_be16(&PSC(port)->mpc52xx_psc_imr, val);
}
static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
{
out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
return in_8(&PSC(port)->mode);
}
#ifdef CONFIG_PPC_MPC52xx
#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
static void mpc52xx_psc_fifo_init(struct uart_port *port)
{
struct mpc52xx_psc __iomem *psc = PSC(port);
struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
out_8(&fifo->rfcntl, 0x00);
out_be16(&fifo->rfalarm, 0x1ff);
out_8(&fifo->tfcntl, 0x07);
out_be16(&fifo->tfalarm, 0x80);
port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
}
static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_status)
& MPC52xx_PSC_SR_RXRDY;
}
static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_status)
& MPC52xx_PSC_SR_TXRDY;
}
static int mpc52xx_psc_rx_rdy(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_isr)
& port->read_status_mask
& MPC52xx_PSC_IMR_RXRDY;
}
static int mpc52xx_psc_tx_rdy(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_isr)
& port->read_status_mask
& MPC52xx_PSC_IMR_TXRDY;
}
static int mpc52xx_psc_tx_empty(struct uart_port *port)
{
return in_be16(&PSC(port)->mpc52xx_psc_status)
& MPC52xx_PSC_SR_TXEMP;
}
static void mpc52xx_psc_start_tx(struct uart_port *port)
{
port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}
static void mpc52xx_psc_stop_tx(struct uart_port *port)
{
port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}
static void mpc52xx_psc_stop_rx(struct uart_port *port)
{
port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}
static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
{
}
static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
{
}
static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
{
out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
}
static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
{
return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
}
static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
{
out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
}
static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
{
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}
static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
struct ktermios *new,
struct ktermios *old)
{
unsigned int baud;
unsigned int divisor;
/* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
baud = uart_get_baud_rate(port, new, old,
port->uartclk / (32 * 0xffff) + 1,
port->uartclk / 32);
divisor = (port->uartclk + 16 * baud) / (32 * baud);
/* enable the /32 prescaler and set the divisor */
mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
return baud;
}
static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
struct ktermios *new,
struct ktermios *old)
{
unsigned int baud;
unsigned int divisor;
u16 prescaler;
/* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
* ipb freq */
baud = uart_get_baud_rate(port, new, old,
port->uartclk / (32 * 0xffff) + 1,
port->uartclk / 4);
divisor = (port->uartclk + 2 * baud) / (4 * baud);
mpc5200b/uart: select more tolerant uart prescaler on low baudrates In addition to the /32 prescaler, the MPC5200B supports a second baudrate prescaler /4 to reach higher baudrates. The current calculation (introduced with commit 0d1f22e4) in the kernel preferes this low prescaler as often as possible, but with some imprecise counterparts the communication on low baudrates fails. According a support-mail from freescale the low prescaler (/4) allows just 1% tolerance in bittiming in contrast to 4% of the high prescaler (/32). The prescaler not only affects the baudrate-calculation, but also the sampling of the bits on the wire. With this patch, we use the slightly less precise, but higher tolerant prescaler calculation on low baudrates up to (and including) 115200 baud and the more precise calculation above. Tested on a custom MPC5200B board with "fsl,mpc5200b-psc-uart". Calculation Examples with prescaler (PS) 4 and 32 and divisor (DIV) on various baudrates. Real stands for the real baudrate generated and Diff for the differences between: 50 Baud PS 32 DIV 0xa122 Real 50 Diff 0.00% 75 Baud PS 32 DIV 0x6b6c Real 75 Diff 0.00% 110 Baud PS 32 DIV 0x493e Real 110 Diff 0.00% 134 Baud PS 32 DIV 0x3c20 Real 133 Diff 0.75% 150 Baud PS 32 DIV 0x35b6 Real 150 Diff 0.00% 200 Baud PS 32 DIV 0x2849 Real 199 Diff 0.50% 300 Baud PS 4 DIV 0xd6d8 Real 300 Diff 0.00% PS 32 DIV 0x1adb Real 300 Diff 0.00% 600 Baud PS 4 DIV 0x6b6c Real 600 Diff 0.00% PS 32 DIV 0x0d6e Real 599 Diff 0.17% 1200 Baud PS 4 DIV 0x35b6 Real 1200 Diff 0.00% PS 32 DIV 0x06b7 Real 1199 Diff 0.08% 1800 Baud PS 4 DIV 0x23cf Real 1799 Diff 0.06% PS 32 DIV 0x047a Real 1799 Diff 0.06% 2400 Baud PS 4 DIV 0x1adb Real 2400 Diff 0.00% PS 32 DIV 0x035b Real 2401 Diff - 0.04% 4800 Baud PS 4 DIV 0x0d6e Real 4799 Diff 0.02% PS 32 DIV 0x01ae Real 4796 Diff 0.08% 9600 Baud PS 4 DIV 0x06b7 Real 9598 Diff 0.02% PS 32 DIV 0x00d7 Real 9593 Diff 0.07% 19200 Baud PS 4 DIV 0x035b Real 19208 Diff - 0.04% PS 32 DIV 0x006b Real 19275 Diff - 0.39% 38400 Baud PS 4 DIV 0x01ae Real 38372 Diff 0.07% PS 32 DIV 0x0036 Real 38194 Diff 0.54% 57600 Baud PS 4 DIV 0x011e Real 57692 Diff - 0.16% PS 32 DIV 0x0024 Real 57291 Diff 0.54% 76800 Baud PS 4 DIV 0x00d7 Real 76744 Diff 0.07% PS 32 DIV 0x001b Real 76388 Diff 0.54% 115200 Baud PS 4 DIV 0x008f Real 115384 Diff - 0.16% PS 32 DIV 0x0012 Real 114583 Diff 0.54% 153600 Baud PS 4 DIV 0x006b Real 154205 Diff - 0.39% PS 32 DIV 0x000d Real 158653 Diff - 3.29% 230400 Baud PS 4 DIV 0x0048 Real 229166 Diff 0.54% PS 32 DIV 0x0009 Real 229166 Diff 0.54% 307200 Baud PS 4 DIV 0x0036 Real 305555 Diff 0.54% PS 32 DIV 0x0007 Real 294642 Diff 4.09% 460800 Baud PS 4 DIV 0x0024 Real 458333 Diff 0.54% PS 32 DIV 0x0005 Real 412500 Diff 10.48% 500000 Baud PS 4 DIV 0x0021 Real 500000 Diff 0.00% PS 32 DIV 0x0004 Real 515625 Diff - 3.13% 576000 Baud PS 4 DIV 0x001d Real 568965 Diff 1.22% PS 32 DIV 0x0004 Real 515625 Diff 10.48% 614400 Baud PS 4 DIV 0x001b Real 611111 Diff 0.54% PS 32 DIV 0x0003 Real 687500 Diff -11.90% 921600 Baud PS 4 DIV 0x0012 Real 916666 Diff 0.54% PS 32 DIV 0x0002 Real 1031250 Diff -11.90% 1000000 Baud PS 4 DIV 0x0011 Real 970588 Diff 2.94% PS 32 DIV 0x0002 Real 1031250 Diff - 3.13% 1152000 Baud PS 4 DIV 0x000e Real 1178571 Diff - 2.31% PS 32 DIV 0x0002 Real 1031250 Diff 10.48% 1500000 Baud PS 4 DIV 0x000b Real 1500000 Diff 0.00% PS 32 DIV 0x0001 Real 2062500 Diff -37.50% 2000000 Baud PS 4 DIV 0x0008 Real 2062500 Diff - 3.13% PS 32 DIV 0x0001 Real 2062500 Diff - 3.13% 2500000 Baud PS 4 DIV 0x0007 Real 2357142 Diff 5.71% PS 32 DIV 0x0001 Real 2062500 Diff 17.50% 3000000 Baud PS 4 DIV 0x0006 Real 2750000 Diff 8.33% PS 32 DIV 0x0001 Real 2062500 Diff 31.25% 3500000 Baud PS 4 DIV 0x0005 Real 3300000 Diff 5.71% PS 32 DIV 0x0001 Real 2062500 Diff 41.07% 4000000 Baud PS 4 DIV 0x0004 Real 4125000 Diff - 3.13% PS 32 DIV 0x0001 Real 2062500 Diff 48.44% Signed-off-by: Frank Benkert <frank.benkert@avat.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-03-05 22:14:29 +07:00
/* select the proper prescaler and set the divisor
* prefer high prescaler for more tolerance on low baudrates */
if (divisor > 0xffff || baud <= 115200) {
divisor = (divisor + 4) / 8;
prescaler = 0xdd00; /* /32 */
} else
prescaler = 0xff00; /* /4 */
mpc52xx_set_divisor(PSC(port), prescaler, divisor);
return baud;
}
static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
{
port->irqflags = 0;
port->irq = irq_of_parse_and_map(np, 0);
}
/* 52xx specific interrupt handler. The caller holds the port lock */
static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
{
return mpc5xxx_uart_process_int(port);
}
static struct psc_ops mpc52xx_psc_ops = {
.fifo_init = mpc52xx_psc_fifo_init,
.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
.rx_rdy = mpc52xx_psc_rx_rdy,
.tx_rdy = mpc52xx_psc_tx_rdy,
.tx_empty = mpc52xx_psc_tx_empty,
.stop_rx = mpc52xx_psc_stop_rx,
.start_tx = mpc52xx_psc_start_tx,
.stop_tx = mpc52xx_psc_stop_tx,
.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
.write_char = mpc52xx_psc_write_char,
.read_char = mpc52xx_psc_read_char,
.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
.set_baudrate = mpc5200_psc_set_baudrate,
.get_irq = mpc52xx_psc_get_irq,
.handle_irq = mpc52xx_psc_handle_irq,
.get_status = mpc52xx_psc_get_status,
.get_ipcr = mpc52xx_psc_get_ipcr,
.command = mpc52xx_psc_command,
.set_mode = mpc52xx_psc_set_mode,
.set_rts = mpc52xx_psc_set_rts,
.enable_ms = mpc52xx_psc_enable_ms,
.set_sicr = mpc52xx_psc_set_sicr,
.set_imr = mpc52xx_psc_set_imr,
.get_mr1 = mpc52xx_psc_get_mr1,
};
static struct psc_ops mpc5200b_psc_ops = {
.fifo_init = mpc52xx_psc_fifo_init,
.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
.rx_rdy = mpc52xx_psc_rx_rdy,
.tx_rdy = mpc52xx_psc_tx_rdy,
.tx_empty = mpc52xx_psc_tx_empty,
.stop_rx = mpc52xx_psc_stop_rx,
.start_tx = mpc52xx_psc_start_tx,
.stop_tx = mpc52xx_psc_stop_tx,
.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
.write_char = mpc52xx_psc_write_char,
.read_char = mpc52xx_psc_read_char,
.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
.set_baudrate = mpc5200b_psc_set_baudrate,
.get_irq = mpc52xx_psc_get_irq,
.handle_irq = mpc52xx_psc_handle_irq,
.get_status = mpc52xx_psc_get_status,
.get_ipcr = mpc52xx_psc_get_ipcr,
.command = mpc52xx_psc_command,
.set_mode = mpc52xx_psc_set_mode,
.set_rts = mpc52xx_psc_set_rts,
.enable_ms = mpc52xx_psc_enable_ms,
.set_sicr = mpc52xx_psc_set_sicr,
.set_imr = mpc52xx_psc_set_imr,
.get_mr1 = mpc52xx_psc_get_mr1,
};
#endif /* CONFIG_MPC52xx */
#ifdef CONFIG_PPC_MPC512x
#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
/* PSC FIFO Controller for mpc512x */
struct psc_fifoc {
u32 fifoc_cmd;
u32 fifoc_int;
u32 fifoc_dma;
u32 fifoc_axe;
u32 fifoc_debug;
};
static struct psc_fifoc __iomem *psc_fifoc;
static unsigned int psc_fifoc_irq;
static struct clk *psc_fifoc_clk;
static void mpc512x_psc_fifo_init(struct uart_port *port)
{
/* /32 prescaler */
out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
out_be32(&FIFO_512x(port)->txalarm, 1);
out_be32(&FIFO_512x(port)->tximr, 0);
out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
out_be32(&FIFO_512x(port)->rxalarm, 1);
out_be32(&FIFO_512x(port)->rximr, 0);
out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
}
static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
{
return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
}
static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
{
return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
}
static int mpc512x_psc_rx_rdy(struct uart_port *port)
{
return in_be32(&FIFO_512x(port)->rxsr)
& in_be32(&FIFO_512x(port)->rximr)
& MPC512x_PSC_FIFO_ALARM;
}
static int mpc512x_psc_tx_rdy(struct uart_port *port)
{
return in_be32(&FIFO_512x(port)->txsr)
& in_be32(&FIFO_512x(port)->tximr)
& MPC512x_PSC_FIFO_ALARM;
}
static int mpc512x_psc_tx_empty(struct uart_port *port)
{
return in_be32(&FIFO_512x(port)->txsr)
& MPC512x_PSC_FIFO_EMPTY;
}
static void mpc512x_psc_stop_rx(struct uart_port *port)
{
unsigned long rx_fifo_imr;
rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
}
static void mpc512x_psc_start_tx(struct uart_port *port)
{
unsigned long tx_fifo_imr;
tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
}
static void mpc512x_psc_stop_tx(struct uart_port *port)
{
unsigned long tx_fifo_imr;
tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
}
static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
{
out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
}
static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
{
out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
}
static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
{
out_8(&FIFO_512x(port)->txdata_8, c);
}
static unsigned char mpc512x_psc_read_char(struct uart_port *port)
{
return in_8(&FIFO_512x(port)->rxdata_8);
}
static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
{
port->read_status_mask =
in_be32(&FIFO_512x(port)->tximr) << 16 |
in_be32(&FIFO_512x(port)->rximr);
out_be32(&FIFO_512x(port)->tximr, 0);
out_be32(&FIFO_512x(port)->rximr, 0);
}
static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
{
out_be32(&FIFO_512x(port)->tximr,
(port->read_status_mask >> 16) & 0x7f);
out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
}
static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
struct ktermios *new,
struct ktermios *old)
{
unsigned int baud;
unsigned int divisor;
/*
* The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
* pg. 30-10 that the chip supports a /32 and a /10 prescaler.
* Furthermore, it states that "After reset, the prescaler by 10
* for the UART mode is selected", but the reset register value is
* 0x0000 which means a /32 prescaler. This is wrong.
*
* In reality using /32 prescaler doesn't work, as it is not supported!
* Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
* Chapter 4.1 PSC in UART Mode.
* Calculate with a /16 prescaler here.
*/
/* uartclk contains the ips freq */
baud = uart_get_baud_rate(port, new, old,
port->uartclk / (16 * 0xffff) + 1,
port->uartclk / 16);
divisor = (port->uartclk + 8 * baud) / (16 * baud);
/* enable the /16 prescaler and set the divisor */
mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
return baud;
}
/* Init PSC FIFO Controller */
static int __init mpc512x_psc_fifoc_init(void)
{
int err;
struct device_node *np;
struct clk *clk;
/* default error code, potentially overwritten by clock calls */
err = -ENODEV;
np = of_find_compatible_node(NULL, NULL,
"fsl,mpc5121-psc-fifo");
if (!np) {
pr_err("%s: Can't find FIFOC node\n", __func__);
goto out_err;
}
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
/* backwards compat with device trees that lack clock specs */
clk = clk_get_sys(np->name, "ipg");
}
if (IS_ERR(clk)) {
pr_err("%s: Can't lookup FIFO clock\n", __func__);
err = PTR_ERR(clk);
goto out_ofnode_put;
}
if (clk_prepare_enable(clk)) {
pr_err("%s: Can't enable FIFO clock\n", __func__);
clk_put(clk);
goto out_ofnode_put;
}
psc_fifoc_clk = clk;
psc_fifoc = of_iomap(np, 0);
if (!psc_fifoc) {
pr_err("%s: Can't map FIFOC\n", __func__);
goto out_clk_disable;
}
psc_fifoc_irq = irq_of_parse_and_map(np, 0);
if (psc_fifoc_irq == 0) {
pr_err("%s: Can't get FIFOC irq\n", __func__);
goto out_unmap;
}
of_node_put(np);
return 0;
out_unmap:
iounmap(psc_fifoc);
out_clk_disable:
clk_disable_unprepare(psc_fifoc_clk);
clk_put(psc_fifoc_clk);
out_ofnode_put:
of_node_put(np);
out_err:
return err;
}
static void __exit mpc512x_psc_fifoc_uninit(void)
{
iounmap(psc_fifoc);
/* disable the clock, errors are not fatal */
if (psc_fifoc_clk) {
clk_disable_unprepare(psc_fifoc_clk);
clk_put(psc_fifoc_clk);
psc_fifoc_clk = NULL;
}
}
/* 512x specific interrupt handler. The caller holds the port lock */
static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
{
unsigned long fifoc_int;
int psc_num;
/* Read pending PSC FIFOC interrupts */
fifoc_int = in_be32(&psc_fifoc->fifoc_int);
/* Check if it is an interrupt for this port */
psc_num = (port->mapbase & 0xf00) >> 8;
if (test_bit(psc_num, &fifoc_int) ||
test_bit(psc_num + 16, &fifoc_int))
return mpc5xxx_uart_process_int(port);
return IRQ_NONE;
}
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
/* called from within the .request_port() callback (allocation) */
static int mpc512x_psc_alloc_clock(struct uart_port *port)
{
int psc_num;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
struct clk *clk;
int err;
psc_num = (port->mapbase & 0xf00) >> 8;
clk = devm_clk_get(port->dev, "mclk");
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
if (IS_ERR(clk)) {
dev_err(port->dev, "Failed to get MCLK!\n");
err = PTR_ERR(clk);
goto out_err;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
}
err = clk_prepare_enable(clk);
if (err) {
dev_err(port->dev, "Failed to enable MCLK!\n");
goto out_err;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
}
psc_mclk_clk[psc_num] = clk;
clk = devm_clk_get(port->dev, "ipg");
if (IS_ERR(clk)) {
dev_err(port->dev, "Failed to get IPG clock!\n");
err = PTR_ERR(clk);
goto out_err;
}
err = clk_prepare_enable(clk);
if (err) {
dev_err(port->dev, "Failed to enable IPG clock!\n");
goto out_err;
}
psc_ipg_clk[psc_num] = clk;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
return 0;
out_err:
if (psc_mclk_clk[psc_num]) {
clk_disable_unprepare(psc_mclk_clk[psc_num]);
psc_mclk_clk[psc_num] = NULL;
}
if (psc_ipg_clk[psc_num]) {
clk_disable_unprepare(psc_ipg_clk[psc_num]);
psc_ipg_clk[psc_num] = NULL;
}
return err;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
}
/* called from within the .release_port() callback (release) */
static void mpc512x_psc_relse_clock(struct uart_port *port)
{
int psc_num;
struct clk *clk;
psc_num = (port->mapbase & 0xf00) >> 8;
clk = psc_mclk_clk[psc_num];
if (clk) {
clk_disable_unprepare(clk);
psc_mclk_clk[psc_num] = NULL;
}
if (psc_ipg_clk[psc_num]) {
clk_disable_unprepare(psc_ipg_clk[psc_num]);
psc_ipg_clk[psc_num] = NULL;
}
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
}
/* implementation of the .clock() callback (enable/disable) */
static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
{
int psc_num;
struct clk *psc_clk;
int ret;
if (uart_console(port))
return 0;
psc_num = (port->mapbase & 0xf00) >> 8;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
psc_clk = psc_mclk_clk[psc_num];
if (!psc_clk) {
dev_err(port->dev, "Failed to get PSC clock entry!\n");
return -ENODEV;
}
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
if (enable) {
ret = clk_enable(psc_clk);
if (ret)
dev_err(port->dev, "Failed to enable MCLK!\n");
return ret;
} else {
clk_disable(psc_clk);
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
return 0;
}
}
static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
{
port->irqflags = IRQF_SHARED;
port->irq = psc_fifoc_irq;
}
#endif
#ifdef CONFIG_PPC_MPC512x
#define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
#define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
static void mpc5125_psc_fifo_init(struct uart_port *port)
{
/* /32 prescaler */
out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
out_be32(&FIFO_5125(port)->txalarm, 1);
out_be32(&FIFO_5125(port)->tximr, 0);
out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
out_be32(&FIFO_5125(port)->rxalarm, 1);
out_be32(&FIFO_5125(port)->rximr, 0);
out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
}
static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
{
return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
}
static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
{
return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
}
static int mpc5125_psc_rx_rdy(struct uart_port *port)
{
return in_be32(&FIFO_5125(port)->rxsr) &
in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
}
static int mpc5125_psc_tx_rdy(struct uart_port *port)
{
return in_be32(&FIFO_5125(port)->txsr) &
in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
}
static int mpc5125_psc_tx_empty(struct uart_port *port)
{
return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
}
static void mpc5125_psc_stop_rx(struct uart_port *port)
{
unsigned long rx_fifo_imr;
rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
}
static void mpc5125_psc_start_tx(struct uart_port *port)
{
unsigned long tx_fifo_imr;
tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
}
static void mpc5125_psc_stop_tx(struct uart_port *port)
{
unsigned long tx_fifo_imr;
tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
}
static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
{
out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
}
static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
{
out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
}
static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
{
out_8(&FIFO_5125(port)->txdata_8, c);
}
static unsigned char mpc5125_psc_read_char(struct uart_port *port)
{
return in_8(&FIFO_5125(port)->rxdata_8);
}
static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
{
port->read_status_mask =
in_be32(&FIFO_5125(port)->tximr) << 16 |
in_be32(&FIFO_5125(port)->rximr);
out_be32(&FIFO_5125(port)->tximr, 0);
out_be32(&FIFO_5125(port)->rximr, 0);
}
static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
{
out_be32(&FIFO_5125(port)->tximr,
(port->read_status_mask >> 16) & 0x7f);
out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
}
static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
u8 prescaler, unsigned int divisor)
{
/* select prescaler */
out_8(&psc->mpc52xx_psc_clock_select, prescaler);
out_8(&psc->ctur, divisor >> 8);
out_8(&psc->ctlr, divisor & 0xff);
}
static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
struct ktermios *new,
struct ktermios *old)
{
unsigned int baud;
unsigned int divisor;
/*
* Calculate with a /16 prescaler here.
*/
/* uartclk contains the ips freq */
baud = uart_get_baud_rate(port, new, old,
port->uartclk / (16 * 0xffff) + 1,
port->uartclk / 16);
divisor = (port->uartclk + 8 * baud) / (16 * baud);
/* enable the /16 prescaler and set the divisor */
mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
return baud;
}
/*
* MPC5125 have compatible PSC FIFO Controller.
* Special init not needed.
*/
static u16 mpc5125_psc_get_status(struct uart_port *port)
{
return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
}
static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
{
return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
}
static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
{
out_8(&PSC_5125(port)->command, cmd);
}
static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
{
out_8(&PSC_5125(port)->mr1, mr1);
out_8(&PSC_5125(port)->mr2, mr2);
}
static void mpc5125_psc_set_rts(struct uart_port *port, int state)
{
if (state & TIOCM_RTS)
out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
else
out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
}
static void mpc5125_psc_enable_ms(struct uart_port *port)
{
struct mpc5125_psc __iomem *psc = PSC_5125(port);
/* clear D_*-bits by reading them */
in_8(&psc->mpc52xx_psc_ipcr);
/* enable CTS and DCD as IPC interrupts */
out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
}
static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
{
out_be32(&PSC_5125(port)->sicr, val);
}
static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
{
out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
}
static u8 mpc5125_psc_get_mr1(struct uart_port *port)
{
return in_8(&PSC_5125(port)->mr1);
}
static struct psc_ops mpc5125_psc_ops = {
.fifo_init = mpc5125_psc_fifo_init,
.raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
.raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
.rx_rdy = mpc5125_psc_rx_rdy,
.tx_rdy = mpc5125_psc_tx_rdy,
.tx_empty = mpc5125_psc_tx_empty,
.stop_rx = mpc5125_psc_stop_rx,
.start_tx = mpc5125_psc_start_tx,
.stop_tx = mpc5125_psc_stop_tx,
.rx_clr_irq = mpc5125_psc_rx_clr_irq,
.tx_clr_irq = mpc5125_psc_tx_clr_irq,
.write_char = mpc5125_psc_write_char,
.read_char = mpc5125_psc_read_char,
.cw_disable_ints = mpc5125_psc_cw_disable_ints,
.cw_restore_ints = mpc5125_psc_cw_restore_ints,
.set_baudrate = mpc5125_psc_set_baudrate,
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
.clock_alloc = mpc512x_psc_alloc_clock,
.clock_relse = mpc512x_psc_relse_clock,
.clock = mpc512x_psc_endis_clock,
.fifoc_init = mpc512x_psc_fifoc_init,
.fifoc_uninit = mpc512x_psc_fifoc_uninit,
.get_irq = mpc512x_psc_get_irq,
.handle_irq = mpc512x_psc_handle_irq,
.get_status = mpc5125_psc_get_status,
.get_ipcr = mpc5125_psc_get_ipcr,
.command = mpc5125_psc_command,
.set_mode = mpc5125_psc_set_mode,
.set_rts = mpc5125_psc_set_rts,
.enable_ms = mpc5125_psc_enable_ms,
.set_sicr = mpc5125_psc_set_sicr,
.set_imr = mpc5125_psc_set_imr,
.get_mr1 = mpc5125_psc_get_mr1,
};
static struct psc_ops mpc512x_psc_ops = {
.fifo_init = mpc512x_psc_fifo_init,
.raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
.raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
.rx_rdy = mpc512x_psc_rx_rdy,
.tx_rdy = mpc512x_psc_tx_rdy,
.tx_empty = mpc512x_psc_tx_empty,
.stop_rx = mpc512x_psc_stop_rx,
.start_tx = mpc512x_psc_start_tx,
.stop_tx = mpc512x_psc_stop_tx,
.rx_clr_irq = mpc512x_psc_rx_clr_irq,
.tx_clr_irq = mpc512x_psc_tx_clr_irq,
.write_char = mpc512x_psc_write_char,
.read_char = mpc512x_psc_read_char,
.cw_disable_ints = mpc512x_psc_cw_disable_ints,
.cw_restore_ints = mpc512x_psc_cw_restore_ints,
.set_baudrate = mpc512x_psc_set_baudrate,
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
.clock_alloc = mpc512x_psc_alloc_clock,
.clock_relse = mpc512x_psc_relse_clock,
.clock = mpc512x_psc_endis_clock,
.fifoc_init = mpc512x_psc_fifoc_init,
.fifoc_uninit = mpc512x_psc_fifoc_uninit,
.get_irq = mpc512x_psc_get_irq,
.handle_irq = mpc512x_psc_handle_irq,
.get_status = mpc52xx_psc_get_status,
.get_ipcr = mpc52xx_psc_get_ipcr,
.command = mpc52xx_psc_command,
.set_mode = mpc52xx_psc_set_mode,
.set_rts = mpc52xx_psc_set_rts,
.enable_ms = mpc52xx_psc_enable_ms,
.set_sicr = mpc52xx_psc_set_sicr,
.set_imr = mpc52xx_psc_set_imr,
.get_mr1 = mpc52xx_psc_get_mr1,
};
#endif /* CONFIG_PPC_MPC512x */
static const struct psc_ops *psc_ops;
/* ======================================================================== */
/* UART operations */
/* ======================================================================== */
static unsigned int
mpc52xx_uart_tx_empty(struct uart_port *port)
{
return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
}
static void
mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
psc_ops->set_rts(port, mctrl & TIOCM_RTS);
}
static unsigned int
mpc52xx_uart_get_mctrl(struct uart_port *port)
{
unsigned int ret = TIOCM_DSR;
u8 status = psc_ops->get_ipcr(port);
if (!(status & MPC52xx_PSC_CTS))
ret |= TIOCM_CTS;
if (!(status & MPC52xx_PSC_DCD))
ret |= TIOCM_CAR;
return ret;
}
static void
mpc52xx_uart_stop_tx(struct uart_port *port)
{
/* port->lock taken by caller */
psc_ops->stop_tx(port);
}
static void
mpc52xx_uart_start_tx(struct uart_port *port)
{
/* port->lock taken by caller */
psc_ops->start_tx(port);
}
static void
mpc52xx_uart_stop_rx(struct uart_port *port)
{
/* port->lock taken by caller */
psc_ops->stop_rx(port);
}
static void
mpc52xx_uart_enable_ms(struct uart_port *port)
{
psc_ops->enable_ms(port);
}
static void
mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
{
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
if (ctl == -1)
psc_ops->command(port, MPC52xx_PSC_START_BRK);
else
psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
spin_unlock_irqrestore(&port->lock, flags);
}
static int
mpc52xx_uart_startup(struct uart_port *port)
{
int ret;
if (psc_ops->clock) {
ret = psc_ops->clock(port, 1);
if (ret)
return ret;
}
/* Request IRQ */
ret = request_irq(port->irq, mpc52xx_uart_int,
port->irqflags, "mpc52xx_psc_uart", port);
if (ret)
return ret;
/* Reset/activate the port, clear and enable interrupts */
psc_ops->command(port, MPC52xx_PSC_RST_RX);
psc_ops->command(port, MPC52xx_PSC_RST_TX);
psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
psc_ops->fifo_init(port);
psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
return 0;
}
static void
mpc52xx_uart_shutdown(struct uart_port *port)
{
/* Shut down the port. Leave TX active if on a console port */
psc_ops->command(port, MPC52xx_PSC_RST_RX);
if (!uart_console(port))
psc_ops->command(port, MPC52xx_PSC_RST_TX);
port->read_status_mask = 0;
psc_ops->set_imr(port, port->read_status_mask);
if (psc_ops->clock)
psc_ops->clock(port, 0);
/* Disable interrupt */
psc_ops->cw_disable_ints(port);
/* Release interrupt */
free_irq(port->irq, port);
}
static void
mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
struct ktermios *old)
{
unsigned long flags;
unsigned char mr1, mr2;
unsigned int j;
unsigned int baud;
/* Prepare what we're gonna write */
mr1 = 0;
switch (new->c_cflag & CSIZE) {
case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
break;
case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
break;
case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
break;
case CS8:
default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
}
if (new->c_cflag & PARENB) {
if (new->c_cflag & CMSPAR)
mr1 |= MPC52xx_PSC_MODE_PARFORCE;
/* With CMSPAR, PARODD also means high parity (same as termios) */
mr1 |= (new->c_cflag & PARODD) ?
MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
} else {
mr1 |= MPC52xx_PSC_MODE_PARNONE;
}
mr2 = 0;
if (new->c_cflag & CSTOPB)
mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
else
mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
MPC52xx_PSC_MODE_ONE_STOP;
if (new->c_cflag & CRTSCTS) {
mr1 |= MPC52xx_PSC_MODE_RXRTS;
mr2 |= MPC52xx_PSC_MODE_TXCTS;
}
/* Get the lock */
spin_lock_irqsave(&port->lock, flags);
/* Do our best to flush TX & RX, so we don't lose anything */
/* But we don't wait indefinitely ! */
j = 5000000; /* Maximum wait */
/* FIXME Can't receive chars since set_termios might be called at early
* boot for the console, all stuff is not yet ready to receive at that
* time and that just makes the kernel oops */
/* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
while (!mpc52xx_uart_tx_empty(port) && --j)
udelay(1);
if (!j)
printk(KERN_ERR "mpc52xx_uart.c: "
"Unable to flush RX & TX fifos in-time in set_termios."
"Some chars may have been lost.\n");
/* Reset the TX & RX */
psc_ops->command(port, MPC52xx_PSC_RST_RX);
psc_ops->command(port, MPC52xx_PSC_RST_TX);
/* Send new mode settings */
psc_ops->set_mode(port, mr1, mr2);
baud = psc_ops->set_baudrate(port, new, old);
/* Update the per-port timeout */
uart_update_timeout(port, new->c_cflag, baud);
if (UART_ENABLE_MS(port, new->c_cflag))
mpc52xx_uart_enable_ms(port);
/* Reenable TX & RX */
psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
/* We're all set, release the lock */
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *
mpc52xx_uart_type(struct uart_port *port)
{
/*
* We keep using PORT_MPC52xx for historic reasons although it applies
* for MPC512x, too, but print "MPC5xxx" to not irritate users
*/
return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
}
static void
mpc52xx_uart_release_port(struct uart_port *port)
{
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
if (psc_ops->clock_relse)
psc_ops->clock_relse(port);
/* remapped by us ? */
if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
port->membase = NULL;
}
release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
}
static int
mpc52xx_uart_request_port(struct uart_port *port)
{
int err;
if (port->flags & UPF_IOREMAP) /* Need to remap ? */
port->membase = ioremap(port->mapbase,
sizeof(struct mpc52xx_psc));
if (!port->membase)
return -EINVAL;
err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
serial: mpc512x: cleanup clock API use cleanup the clock API use of the UART driver which is shared among the MPC512x and the MPC5200 platforms - get, prepare, and enable the MCLK during port allocation; disable, unprepare and put the MCLK upon port release; hold a reference to the clock over the period of use; check for and propagate enable errors - fix a buffer overflow for clock names with two digit PSC index numbers - stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only switch to a fixed string later after device tree based clock lookup will have become available to achieve support for MPC512x which is neutral to MPC5200, the modification was done as follows - introduce "clock alloc" and "clock release" routines in addition to the previous "clock enable/disable" routine in the psc_ops struct - make the clock allocation a part of the port request (resource allocation), and make clock release a part of the port release, such that essential resources get allocated early - just enable/disable the clock from within the .clock() callback without any allocation or preparation as the former implementation did, since this routine is called from within the startup and shutdown callbacks - all of the above remains a NOP for the MPC5200 platform (no callbacks are provided on that platform) - implementation note: the clock gets enabled upon allocation already just in case the clock is not only required for bitrate generation but for register access as well Signed-off-by: Gerhard Sittig <gsi@denx.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2013-08-07 03:43:42 +07:00
if (err)
goto out_membase;
if (psc_ops->clock_alloc) {
err = psc_ops->clock_alloc(port);
if (err)
goto out_mapregion;
}
return 0;
out_mapregion:
release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
out_membase:
if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
port->membase = NULL;
}
return err;
}
static void
mpc52xx_uart_config_port(struct uart_port *port, int flags)
{
if ((flags & UART_CONFIG_TYPE)
&& (mpc52xx_uart_request_port(port) == 0))
port->type = PORT_MPC52xx;
}
static int
mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
{
if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
return -EINVAL;
if ((ser->irq != port->irq) ||
(ser->io_type != UPIO_MEM) ||
(ser->baud_base != port->uartclk) ||
(ser->iomem_base != (void *)port->mapbase) ||
(ser->hub6 != 0))
return -EINVAL;
return 0;
}
static struct uart_ops mpc52xx_uart_ops = {
.tx_empty = mpc52xx_uart_tx_empty,
.set_mctrl = mpc52xx_uart_set_mctrl,
.get_mctrl = mpc52xx_uart_get_mctrl,
.stop_tx = mpc52xx_uart_stop_tx,
.start_tx = mpc52xx_uart_start_tx,
.stop_rx = mpc52xx_uart_stop_rx,
.enable_ms = mpc52xx_uart_enable_ms,
.break_ctl = mpc52xx_uart_break_ctl,
.startup = mpc52xx_uart_startup,
.shutdown = mpc52xx_uart_shutdown,
.set_termios = mpc52xx_uart_set_termios,
/* .pm = mpc52xx_uart_pm, Not supported yet */
.type = mpc52xx_uart_type,
.release_port = mpc52xx_uart_release_port,
.request_port = mpc52xx_uart_request_port,
.config_port = mpc52xx_uart_config_port,
.verify_port = mpc52xx_uart_verify_port
};
/* ======================================================================== */
/* Interrupt handling */
/* ======================================================================== */
static inline int
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 20:55:46 +07:00
mpc52xx_uart_int_rx_chars(struct uart_port *port)
{
struct tty_port *tport = &port->state->port;
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
unsigned char ch, flag;
unsigned short status;
/* While we can read, do so ! */
while (psc_ops->raw_rx_rdy(port)) {
/* Get the char */
ch = psc_ops->read_char(port);
/* Handle sysreq char */
#ifdef SUPPORT_SYSRQ
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 20:55:46 +07:00
if (uart_handle_sysrq_char(port, ch)) {
port->sysrq = 0;
continue;
}
#endif
/* Store it */
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
flag = TTY_NORMAL;
port->icount.rx++;
status = psc_ops->get_status(port);
if (status & (MPC52xx_PSC_SR_PE |
MPC52xx_PSC_SR_FE |
MPC52xx_PSC_SR_RB)) {
if (status & MPC52xx_PSC_SR_RB) {
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
flag = TTY_BREAK;
uart_handle_break(port);
port->icount.brk++;
} else if (status & MPC52xx_PSC_SR_PE) {
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
flag = TTY_PARITY;
port->icount.parity++;
}
else if (status & MPC52xx_PSC_SR_FE) {
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
flag = TTY_FRAME;
port->icount.frame++;
}
/* Clear error condition */
psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
}
tty_insert_flip_char(tport, ch, flag);
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
if (status & MPC52xx_PSC_SR_OE) {
/*
* Overrun is special, since it's
* reported immediately, and doesn't
* affect the current character
*/
tty_insert_flip_char(tport, 0, TTY_OVERRUN);
port->icount.overrun++;
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 11:54:13 +07:00
}
}
spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
spin_lock(&port->lock);
return psc_ops->raw_rx_rdy(port);
}
static inline int
mpc52xx_uart_int_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
/* Process out of band chars */
if (port->x_char) {
psc_ops->write_char(port, port->x_char);
port->icount.tx++;
port->x_char = 0;
return 1;
}
/* Nothing to do ? */
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
mpc52xx_uart_stop_tx(port);
return 0;
}
/* Send chars */
while (psc_ops->raw_tx_rdy(port)) {
psc_ops->write_char(port, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
}
/* Wake up */
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
/* Maybe we're done after all */
if (uart_circ_empty(xmit)) {
mpc52xx_uart_stop_tx(port);
return 0;
}
return 1;
}
static irqreturn_t
mpc5xxx_uart_process_int(struct uart_port *port)
{
unsigned long pass = ISR_PASS_LIMIT;
unsigned int keepgoing;
u8 status;
/* While we have stuff to do, we continue */
do {
/* If we don't find anything to do, we stop */
keepgoing = 0;
psc_ops->rx_clr_irq(port);
if (psc_ops->rx_rdy(port))
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 20:55:46 +07:00
keepgoing |= mpc52xx_uart_int_rx_chars(port);
psc_ops->tx_clr_irq(port);
if (psc_ops->tx_rdy(port))
keepgoing |= mpc52xx_uart_int_tx_chars(port);
status = psc_ops->get_ipcr(port);
if (status & MPC52xx_PSC_D_DCD)
uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
if (status & MPC52xx_PSC_D_CTS)
uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
/* Limit number of iteration */
if (!(--pass))
keepgoing = 0;
} while (keepgoing);
return IRQ_HANDLED;
}
static irqreturn_t
mpc52xx_uart_int(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
irqreturn_t ret;
spin_lock(&port->lock);
ret = psc_ops->handle_irq(port);
spin_unlock(&port->lock);
return ret;
}
/* ======================================================================== */
/* Console ( if applicable ) */
/* ======================================================================== */
#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
static void __init
mpc52xx_console_get_options(struct uart_port *port,
int *baud, int *parity, int *bits, int *flow)
{
unsigned char mr1;
pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
/* Read the mode registers */
mr1 = psc_ops->get_mr1(port);
/* CT{U,L}R are write-only ! */
*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
/* Parse them */
switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
case MPC52xx_PSC_MODE_5_BITS:
*bits = 5;
break;
case MPC52xx_PSC_MODE_6_BITS:
*bits = 6;
break;
case MPC52xx_PSC_MODE_7_BITS:
*bits = 7;
break;
case MPC52xx_PSC_MODE_8_BITS:
default:
*bits = 8;
}
if (mr1 & MPC52xx_PSC_MODE_PARNONE)
*parity = 'n';
else
*parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
}
static void
mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_port *port = &mpc52xx_uart_ports[co->index];
unsigned int i, j;
/* Disable interrupts */
psc_ops->cw_disable_ints(port);
/* Wait the TX buffer to be empty */
j = 5000000; /* Maximum wait */
while (!mpc52xx_uart_tx_empty(port) && --j)
udelay(1);
/* Write all the chars */
for (i = 0; i < count; i++, s++) {
/* Line return handling */
if (*s == '\n')
psc_ops->write_char(port, '\r');
/* Send the char */
psc_ops->write_char(port, *s);
/* Wait the TX buffer to be empty */
j = 20000; /* Maximum wait */
while (!mpc52xx_uart_tx_empty(port) && --j)
udelay(1);
}
/* Restore interrupt state */
psc_ops->cw_restore_ints(port);
}
static int __init
mpc52xx_console_setup(struct console *co, char *options)
{
struct uart_port *port = &mpc52xx_uart_ports[co->index];
struct device_node *np = mpc52xx_uart_nodes[co->index];
unsigned int uartclk;
struct resource res;
int ret;
int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
int bits = 8;
int parity = 'n';
int flow = 'n';
pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
co, co->index, options);
if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
pr_debug("PSC%x out of range\n", co->index);
return -EINVAL;
}
if (!np) {
pr_debug("PSC%x not found in device tree\n", co->index);
return -EINVAL;
}
pr_debug("Console on ttyPSC%x is %s\n",
co->index, mpc52xx_uart_nodes[co->index]->full_name);
/* Fetch register locations */
ret = of_address_to_resource(np, 0, &res);
if (ret) {
pr_debug("Could not get resources for PSC%x\n", co->index);
return ret;
}
uartclk = mpc5xxx_get_bus_frequency(np);
if (uartclk == 0) {
pr_debug("Could not find uart clock frequency!\n");
return -EINVAL;
}
/* Basic port init. Needed since we use some uart_??? func before
* real init for early access */
spin_lock_init(&port->lock);
port->uartclk = uartclk;
port->ops = &mpc52xx_uart_ops;
port->mapbase = res.start;
port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
port->irq = irq_of_parse_and_map(np, 0);
if (port->membase == NULL)
return -EINVAL;
pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
(void *)port->mapbase, port->membase,
port->irq, port->uartclk);
/* Setup the port parameters accoding to options */
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
baud, bits, parity, flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver mpc52xx_uart_driver;
static struct console mpc52xx_console = {
.name = "ttyPSC",
.write = mpc52xx_console_write,
.device = uart_console_device,
.setup = mpc52xx_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
.data = &mpc52xx_uart_driver,
};
static int __init
mpc52xx_console_init(void)
{
mpc52xx_uart_of_enumerate();
register_console(&mpc52xx_console);
return 0;
}
console_initcall(mpc52xx_console_init);
#define MPC52xx_PSC_CONSOLE &mpc52xx_console
#else
#define MPC52xx_PSC_CONSOLE NULL
#endif
/* ======================================================================== */
/* UART Driver */
/* ======================================================================== */
static struct uart_driver mpc52xx_uart_driver = {
.driver_name = "mpc52xx_psc_uart",
.dev_name = "ttyPSC",
.major = SERIAL_PSC_MAJOR,
.minor = SERIAL_PSC_MINOR,
.nr = MPC52xx_PSC_MAXNUM,
.cons = MPC52xx_PSC_CONSOLE,
};
/* ======================================================================== */
/* OF Platform Driver */
/* ======================================================================== */
static const struct of_device_id mpc52xx_uart_of_match[] = {
#ifdef CONFIG_PPC_MPC52xx
{ .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
{ .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
/* binding used by old lite5200 device trees: */
{ .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
/* binding used by efika: */
{ .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
#endif
#ifdef CONFIG_PPC_MPC512x
{ .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
{ .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
#endif
{},
};
static int mpc52xx_uart_of_probe(struct platform_device *op)
{
int idx = -1;
unsigned int uartclk;
struct uart_port *port = NULL;
struct resource res;
int ret;
/* Check validity & presence */
for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
break;
if (idx >= MPC52xx_PSC_MAXNUM)
return -EINVAL;
pr_debug("Found %s assigned to ttyPSC%x\n",
mpc52xx_uart_nodes[idx]->full_name, idx);
/* set the uart clock to the input clock of the psc, the different
* prescalers are taken into account in the set_baudrate() methods
* of the respective chip */
uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
if (uartclk == 0) {
dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
return -EINVAL;
}
/* Init the port structure */
port = &mpc52xx_uart_ports[idx];
spin_lock_init(&port->lock);
port->uartclk = uartclk;
port->fifosize = 512;
port->iotype = UPIO_MEM;
port->flags = UPF_BOOT_AUTOCONF |
(uart_console(port) ? 0 : UPF_IOREMAP);
port->line = idx;
port->ops = &mpc52xx_uart_ops;
port->dev = &op->dev;
/* Search for IRQ and mapbase */
ret = of_address_to_resource(op->dev.of_node, 0, &res);
if (ret)
return ret;
port->mapbase = res.start;
if (!port->mapbase) {
dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
return -EINVAL;
}
psc_ops->get_irq(port, op->dev.of_node);
if (port->irq == 0) {
dev_dbg(&op->dev, "Could not get irq\n");
return -EINVAL;
}
dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
(void *)port->mapbase, port->irq, port->uartclk);
/* Add the port to the uart sub-system */
ret = uart_add_one_port(&mpc52xx_uart_driver, port);
if (ret)
return ret;
platform_set_drvdata(op, (void *)port);
return 0;
}
static int
mpc52xx_uart_of_remove(struct platform_device *op)
{
struct uart_port *port = platform_get_drvdata(op);
if (port)
uart_remove_one_port(&mpc52xx_uart_driver, port);
return 0;
}
#ifdef CONFIG_PM
static int
mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
{
struct uart_port *port = platform_get_drvdata(op);
if (port)
uart_suspend_port(&mpc52xx_uart_driver, port);
return 0;
}
static int
mpc52xx_uart_of_resume(struct platform_device *op)
{
struct uart_port *port = platform_get_drvdata(op);
if (port)
uart_resume_port(&mpc52xx_uart_driver, port);
return 0;
}
#endif
static void
mpc52xx_uart_of_assign(struct device_node *np)
{
int i;
/* Find the first free PSC number */
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
if (mpc52xx_uart_nodes[i] == NULL) {
of_node_get(np);
mpc52xx_uart_nodes[i] = np;
return;
}
}
}
static void
mpc52xx_uart_of_enumerate(void)
{
static int enum_done;
struct device_node *np;
const struct of_device_id *match;
int i;
if (enum_done)
return;
/* Assign index to each PSC in device tree */
for_each_matching_node(np, mpc52xx_uart_of_match) {
match = of_match_node(mpc52xx_uart_of_match, np);
psc_ops = match->data;
mpc52xx_uart_of_assign(np);
}
enum_done = 1;
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
if (mpc52xx_uart_nodes[i])
pr_debug("%s assigned to ttyPSC%x\n",
mpc52xx_uart_nodes[i]->full_name, i);
}
}
MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
static struct platform_driver mpc52xx_uart_of_driver = {
.probe = mpc52xx_uart_of_probe,
.remove = mpc52xx_uart_of_remove,
#ifdef CONFIG_PM
.suspend = mpc52xx_uart_of_suspend,
.resume = mpc52xx_uart_of_resume,
#endif
.driver = {
.name = "mpc52xx-psc-uart",
.of_match_table = mpc52xx_uart_of_match,
},
};
/* ======================================================================== */
/* Module */
/* ======================================================================== */
static int __init
mpc52xx_uart_init(void)
{
int ret;
printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
ret = uart_register_driver(&mpc52xx_uart_driver);
if (ret) {
printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
__FILE__, ret);
return ret;
}
mpc52xx_uart_of_enumerate();
/*
* Map the PSC FIFO Controller and init if on MPC512x.
*/
if (psc_ops && psc_ops->fifoc_init) {
ret = psc_ops->fifoc_init();
if (ret)
goto err_init;
}
ret = platform_driver_register(&mpc52xx_uart_of_driver);
if (ret) {
printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
__FILE__, ret);
goto err_reg;
}
return 0;
err_reg:
if (psc_ops && psc_ops->fifoc_uninit)
psc_ops->fifoc_uninit();
err_init:
uart_unregister_driver(&mpc52xx_uart_driver);
return ret;
}
static void __exit
mpc52xx_uart_exit(void)
{
if (psc_ops->fifoc_uninit)
psc_ops->fifoc_uninit();
platform_driver_unregister(&mpc52xx_uart_of_driver);
uart_unregister_driver(&mpc52xx_uart_driver);
}
module_init(mpc52xx_uart_init);
module_exit(mpc52xx_uart_exit);
MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
MODULE_LICENSE("GPL");