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linux/drivers/serial/serial_txx9.c
David Howells 7d12e780e0 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 15:10:12 +01:00

1205 lines
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/*
* drivers/serial/serial_txx9.c
*
* Derived from many drivers using generic_serial interface,
* especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
* (was in Linux/VR tree) by Jim Pick.
*
* Copyright (C) 1999 Harald Koerfgen
* Copyright (C) 2000 Jim Pick <jim@jimpick.com>
* Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
* Copyright (C) 2000-2002 Toshiba Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller
*
* Revision History:
* 0.30 Initial revision. (Renamed from serial_txx927.c)
* 0.31 Use save_flags instead of local_irq_save.
* 0.32 Support SCLK.
* 0.33 Switch TXX9_TTY_NAME by CONFIG_SERIAL_TXX9_STDSERIAL.
* Support TIOCSERGETLSR.
* 0.34 Support slow baudrate.
* 0.40 Merge codes from mainstream kernel (2.4.22).
* 0.41 Fix console checking in rs_shutdown_port().
* Disable flow-control in serial_console_write().
* 0.42 Fix minor compiler warning.
* 1.00 Kernel 2.6. Converted to new serial core (based on 8250.c).
* 1.01 Set fifosize to make tx_empry called properly.
* Use standard uart_get_divisor.
* 1.02 Cleanup. (import 8250.c changes)
* 1.03 Fix low-latency mode. (import 8250.c changes)
* 1.04 Remove usage of deprecated functions, cleanup.
* 1.05 More strict check in verify_port. Cleanup.
* 1.06 Do not insert a char caused previous overrun.
* Fix some spin_locks.
* Do not call uart_add_one_port for absent ports.
*/
#if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include <asm/irq.h>
static char *serial_version = "1.06";
static char *serial_name = "TX39/49 Serial driver";
#define PASS_LIMIT 256
#if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
/* "ttyS" is used for standard serial driver */
#define TXX9_TTY_NAME "ttyTX"
#define TXX9_TTY_MINOR_START (64 + 64) /* ttyTX0(128), ttyTX1(129) */
#else
/* acts like standard serial driver */
#define TXX9_TTY_NAME "ttyS"
#define TXX9_TTY_MINOR_START 64
#endif
#define TXX9_TTY_MAJOR TTY_MAJOR
/* flag aliases */
#define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART
#define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER
#ifdef CONFIG_PCI
/* support for Toshiba TC86C001 SIO */
#define ENABLE_SERIAL_TXX9_PCI
#endif
/*
* Number of serial ports
*/
#ifdef ENABLE_SERIAL_TXX9_PCI
#define NR_PCI_BOARDS 4
#define UART_NR (4 + NR_PCI_BOARDS)
#else
#define UART_NR 4
#endif
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
struct uart_txx9_port {
struct uart_port port;
/*
* We provide a per-port pm hook.
*/
void (*pm)(struct uart_port *port,
unsigned int state, unsigned int old);
};
#define TXX9_REGION_SIZE 0x24
/* TXX9 Serial Registers */
#define TXX9_SILCR 0x00
#define TXX9_SIDICR 0x04
#define TXX9_SIDISR 0x08
#define TXX9_SICISR 0x0c
#define TXX9_SIFCR 0x10
#define TXX9_SIFLCR 0x14
#define TXX9_SIBGR 0x18
#define TXX9_SITFIFO 0x1c
#define TXX9_SIRFIFO 0x20
/* SILCR : Line Control */
#define TXX9_SILCR_SCS_MASK 0x00000060
#define TXX9_SILCR_SCS_IMCLK 0x00000000
#define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
#define TXX9_SILCR_SCS_SCLK 0x00000040
#define TXX9_SILCR_SCS_SCLK_BG 0x00000060
#define TXX9_SILCR_UEPS 0x00000010
#define TXX9_SILCR_UPEN 0x00000008
#define TXX9_SILCR_USBL_MASK 0x00000004
#define TXX9_SILCR_USBL_1BIT 0x00000000
#define TXX9_SILCR_USBL_2BIT 0x00000004
#define TXX9_SILCR_UMODE_MASK 0x00000003
#define TXX9_SILCR_UMODE_8BIT 0x00000000
#define TXX9_SILCR_UMODE_7BIT 0x00000001
/* SIDICR : DMA/Int. Control */
#define TXX9_SIDICR_TDE 0x00008000
#define TXX9_SIDICR_RDE 0x00004000
#define TXX9_SIDICR_TIE 0x00002000
#define TXX9_SIDICR_RIE 0x00001000
#define TXX9_SIDICR_SPIE 0x00000800
#define TXX9_SIDICR_CTSAC 0x00000600
#define TXX9_SIDICR_STIE_MASK 0x0000003f
#define TXX9_SIDICR_STIE_OERS 0x00000020
#define TXX9_SIDICR_STIE_CTSS 0x00000010
#define TXX9_SIDICR_STIE_RBRKD 0x00000008
#define TXX9_SIDICR_STIE_TRDY 0x00000004
#define TXX9_SIDICR_STIE_TXALS 0x00000002
#define TXX9_SIDICR_STIE_UBRKD 0x00000001
/* SIDISR : DMA/Int. Status */
#define TXX9_SIDISR_UBRK 0x00008000
#define TXX9_SIDISR_UVALID 0x00004000
#define TXX9_SIDISR_UFER 0x00002000
#define TXX9_SIDISR_UPER 0x00001000
#define TXX9_SIDISR_UOER 0x00000800
#define TXX9_SIDISR_ERI 0x00000400
#define TXX9_SIDISR_TOUT 0x00000200
#define TXX9_SIDISR_TDIS 0x00000100
#define TXX9_SIDISR_RDIS 0x00000080
#define TXX9_SIDISR_STIS 0x00000040
#define TXX9_SIDISR_RFDN_MASK 0x0000001f
/* SICISR : Change Int. Status */
#define TXX9_SICISR_OERS 0x00000020
#define TXX9_SICISR_CTSS 0x00000010
#define TXX9_SICISR_RBRKD 0x00000008
#define TXX9_SICISR_TRDY 0x00000004
#define TXX9_SICISR_TXALS 0x00000002
#define TXX9_SICISR_UBRKD 0x00000001
/* SIFCR : FIFO Control */
#define TXX9_SIFCR_SWRST 0x00008000
#define TXX9_SIFCR_RDIL_MASK 0x00000180
#define TXX9_SIFCR_RDIL_1 0x00000000
#define TXX9_SIFCR_RDIL_4 0x00000080
#define TXX9_SIFCR_RDIL_8 0x00000100
#define TXX9_SIFCR_RDIL_12 0x00000180
#define TXX9_SIFCR_RDIL_MAX 0x00000180
#define TXX9_SIFCR_TDIL_MASK 0x00000018
#define TXX9_SIFCR_TDIL_MASK 0x00000018
#define TXX9_SIFCR_TDIL_1 0x00000000
#define TXX9_SIFCR_TDIL_4 0x00000001
#define TXX9_SIFCR_TDIL_8 0x00000010
#define TXX9_SIFCR_TDIL_MAX 0x00000010
#define TXX9_SIFCR_TFRST 0x00000004
#define TXX9_SIFCR_RFRST 0x00000002
#define TXX9_SIFCR_FRSTE 0x00000001
#define TXX9_SIO_TX_FIFO 8
#define TXX9_SIO_RX_FIFO 16
/* SIFLCR : Flow Control */
#define TXX9_SIFLCR_RCS 0x00001000
#define TXX9_SIFLCR_TES 0x00000800
#define TXX9_SIFLCR_RTSSC 0x00000200
#define TXX9_SIFLCR_RSDE 0x00000100
#define TXX9_SIFLCR_TSDE 0x00000080
#define TXX9_SIFLCR_RTSTL_MASK 0x0000001e
#define TXX9_SIFLCR_RTSTL_MAX 0x0000001e
#define TXX9_SIFLCR_TBRK 0x00000001
/* SIBGR : Baudrate Control */
#define TXX9_SIBGR_BCLK_MASK 0x00000300
#define TXX9_SIBGR_BCLK_T0 0x00000000
#define TXX9_SIBGR_BCLK_T2 0x00000100
#define TXX9_SIBGR_BCLK_T4 0x00000200
#define TXX9_SIBGR_BCLK_T6 0x00000300
#define TXX9_SIBGR_BRD_MASK 0x000000ff
static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
{
switch (up->port.iotype) {
default:
return __raw_readl(up->port.membase + offset);
case UPIO_PORT:
return inl(up->port.iobase + offset);
}
}
static inline void
sio_out(struct uart_txx9_port *up, int offset, int value)
{
switch (up->port.iotype) {
default:
__raw_writel(value, up->port.membase + offset);
break;
case UPIO_PORT:
outl(value, up->port.iobase + offset);
break;
}
}
static inline void
sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
{
sio_out(up, offset, sio_in(up, offset) & ~value);
}
static inline void
sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
{
sio_out(up, offset, sio_in(up, offset) | value);
}
static inline void
sio_quot_set(struct uart_txx9_port *up, int quot)
{
quot >>= 1;
if (quot < 256)
sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
else if (quot < (256 << 2))
sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
else if (quot < (256 << 4))
sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
else if (quot < (256 << 6))
sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
else
sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
}
static void serial_txx9_stop_tx(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
}
static void serial_txx9_start_tx(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
}
static void serial_txx9_stop_rx(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
}
static void serial_txx9_enable_ms(struct uart_port *port)
{
/* TXX9-SIO can not control DTR... */
}
static inline void
receive_chars(struct uart_txx9_port *up, unsigned int *status)
{
struct tty_struct *tty = up->port.info->tty;
unsigned char ch;
unsigned int disr = *status;
int max_count = 256;
char flag;
unsigned int next_ignore_status_mask;
do {
ch = sio_in(up, TXX9_SIRFIFO);
flag = TTY_NORMAL;
up->port.icount.rx++;
/* mask out RFDN_MASK bit added by previous overrun */
next_ignore_status_mask =
up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
/*
* For statistics only
*/
if (disr & TXX9_SIDISR_UBRK) {
disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
up->port.icount.brk++;
/*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
* or read_status_mask.
*/
if (uart_handle_break(&up->port))
goto ignore_char;
} else if (disr & TXX9_SIDISR_UPER)
up->port.icount.parity++;
else if (disr & TXX9_SIDISR_UFER)
up->port.icount.frame++;
if (disr & TXX9_SIDISR_UOER) {
up->port.icount.overrun++;
/*
* The receiver read buffer still hold
* a char which caused overrun.
* Ignore next char by adding RFDN_MASK
* to ignore_status_mask temporarily.
*/
next_ignore_status_mask |=
TXX9_SIDISR_RFDN_MASK;
}
/*
* Mask off conditions which should be ingored.
*/
disr &= up->port.read_status_mask;
if (disr & TXX9_SIDISR_UBRK) {
flag = TTY_BREAK;
} else if (disr & TXX9_SIDISR_UPER)
flag = TTY_PARITY;
else if (disr & TXX9_SIDISR_UFER)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(&up->port, ch))
goto ignore_char;
uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
ignore_char:
up->port.ignore_status_mask = next_ignore_status_mask;
disr = sio_in(up, TXX9_SIDISR);
} while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
spin_unlock(&up->port.lock);
tty_flip_buffer_push(tty);
spin_lock(&up->port.lock);
*status = disr;
}
static inline void transmit_chars(struct uart_txx9_port *up)
{
struct circ_buf *xmit = &up->port.info->xmit;
int count;
if (up->port.x_char) {
sio_out(up, TXX9_SITFIFO, up->port.x_char);
up->port.icount.tx++;
up->port.x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
serial_txx9_stop_tx(&up->port);
return;
}
count = TXX9_SIO_TX_FIFO;
do {
sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
if (uart_circ_empty(xmit))
serial_txx9_stop_tx(&up->port);
}
static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
{
int pass_counter = 0;
struct uart_txx9_port *up = dev_id;
unsigned int status;
while (1) {
spin_lock(&up->port.lock);
status = sio_in(up, TXX9_SIDISR);
if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
status &= ~TXX9_SIDISR_TDIS;
if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
TXX9_SIDISR_TOUT))) {
spin_unlock(&up->port.lock);
break;
}
if (status & TXX9_SIDISR_RDIS)
receive_chars(up, &status);
if (status & TXX9_SIDISR_TDIS)
transmit_chars(up);
/* Clear TX/RX Int. Status */
sio_mask(up, TXX9_SIDISR,
TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
TXX9_SIDISR_TOUT);
spin_unlock(&up->port.lock);
if (pass_counter++ > PASS_LIMIT)
break;
}
return pass_counter ? IRQ_HANDLED : IRQ_NONE;
}
static unsigned int serial_txx9_tx_empty(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&up->port.lock, flags);
ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
spin_unlock_irqrestore(&up->port.lock, flags);
return ret;
}
static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned int ret;
ret = ((sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
| ((sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS);
return ret;
}
static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
if (mctrl & TIOCM_RTS)
sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
else
sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
}
static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
if (break_state == -1)
sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
else
sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static int serial_txx9_startup(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned long flags;
int retval;
/*
* Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios())
*/
sio_set(up, TXX9_SIFCR,
TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
/* clear reset */
sio_mask(up, TXX9_SIFCR,
TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
sio_out(up, TXX9_SIDICR, 0);
/*
* Clear the interrupt registers.
*/
sio_out(up, TXX9_SIDISR, 0);
retval = request_irq(up->port.irq, serial_txx9_interrupt,
IRQF_SHARED, "serial_txx9", up);
if (retval)
return retval;
/*
* Now, initialize the UART
*/
spin_lock_irqsave(&up->port.lock, flags);
serial_txx9_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
/* Enable RX/TX */
sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
/*
* Finally, enable interrupts.
*/
sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
return 0;
}
static void serial_txx9_shutdown(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned long flags;
/*
* Disable interrupts from this port
*/
sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
spin_lock_irqsave(&up->port.lock, flags);
serial_txx9_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
/*
* Disable break condition
*/
sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
#ifdef CONFIG_SERIAL_TXX9_CONSOLE
if (up->port.cons && up->port.line == up->port.cons->index) {
free_irq(up->port.irq, up);
return;
}
#endif
/* reset FIFOs */
sio_set(up, TXX9_SIFCR,
TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
/* clear reset */
sio_mask(up, TXX9_SIFCR,
TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
/* Disable RX/TX */
sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
free_irq(up->port.irq, up);
}
static void
serial_txx9_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned int cval, fcr = 0;
unsigned long flags;
unsigned int baud, quot;
cval = sio_in(up, TXX9_SILCR);
/* byte size and parity */
cval &= ~TXX9_SILCR_UMODE_MASK;
switch (termios->c_cflag & CSIZE) {
case CS7:
cval |= TXX9_SILCR_UMODE_7BIT;
break;
default:
case CS5: /* not supported */
case CS6: /* not supported */
case CS8:
cval |= TXX9_SILCR_UMODE_8BIT;
break;
}
cval &= ~TXX9_SILCR_USBL_MASK;
if (termios->c_cflag & CSTOPB)
cval |= TXX9_SILCR_USBL_2BIT;
else
cval |= TXX9_SILCR_USBL_1BIT;
cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
if (termios->c_cflag & PARENB)
cval |= TXX9_SILCR_UPEN;
if (!(termios->c_cflag & PARODD))
cval |= TXX9_SILCR_UEPS;
/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
quot = uart_get_divisor(port, baud);
/* Set up FIFOs */
/* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
/*
* Ok, we're now changing the port state. Do it with
* interrupts disabled.
*/
spin_lock_irqsave(&up->port.lock, flags);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
up->port.read_status_mask = TXX9_SIDISR_UOER |
TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
if (termios->c_iflag & (BRKINT | PARMRK))
up->port.read_status_mask |= TXX9_SIDISR_UBRK;
/*
* Characteres to ignore
*/
up->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
if (termios->c_iflag & IGNBRK) {
up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_cflag & CREAD) == 0)
up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
/* CTS flow control flag */
if ((termios->c_cflag & CRTSCTS) &&
(up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
sio_set(up, TXX9_SIFLCR,
TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
} else {
sio_mask(up, TXX9_SIFLCR,
TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
}
sio_out(up, TXX9_SILCR, cval);
sio_quot_set(up, quot);
sio_out(up, TXX9_SIFCR, fcr);
serial_txx9_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void
serial_txx9_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
if (up->pm)
up->pm(port, state, oldstate);
}
static int serial_txx9_request_resource(struct uart_txx9_port *up)
{
unsigned int size = TXX9_REGION_SIZE;
int ret = 0;
switch (up->port.iotype) {
default:
if (!up->port.mapbase)
break;
if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
ret = -EBUSY;
break;
}
if (up->port.flags & UPF_IOREMAP) {
up->port.membase = ioremap(up->port.mapbase, size);
if (!up->port.membase) {
release_mem_region(up->port.mapbase, size);
ret = -ENOMEM;
}
}
break;
case UPIO_PORT:
if (!request_region(up->port.iobase, size, "serial_txx9"))
ret = -EBUSY;
break;
}
return ret;
}
static void serial_txx9_release_resource(struct uart_txx9_port *up)
{
unsigned int size = TXX9_REGION_SIZE;
switch (up->port.iotype) {
default:
if (!up->port.mapbase)
break;
if (up->port.flags & UPF_IOREMAP) {
iounmap(up->port.membase);
up->port.membase = NULL;
}
release_mem_region(up->port.mapbase, size);
break;
case UPIO_PORT:
release_region(up->port.iobase, size);
break;
}
}
static void serial_txx9_release_port(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
serial_txx9_release_resource(up);
}
static int serial_txx9_request_port(struct uart_port *port)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
return serial_txx9_request_resource(up);
}
static void serial_txx9_config_port(struct uart_port *port, int uflags)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
unsigned long flags;
int ret;
/*
* Find the region that we can probe for. This in turn
* tells us whether we can probe for the type of port.
*/
ret = serial_txx9_request_resource(up);
if (ret < 0)
return;
port->type = PORT_TXX9;
up->port.fifosize = TXX9_SIO_TX_FIFO;
#ifdef CONFIG_SERIAL_TXX9_CONSOLE
if (up->port.line == up->port.cons->index)
return;
#endif
spin_lock_irqsave(&up->port.lock, flags);
/*
* Reset the UART.
*/
sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
#ifdef CONFIG_CPU_TX49XX
/* TX4925 BUG WORKAROUND. Accessing SIOC register
* immediately after soft reset causes bus error. */
iob();
udelay(1);
#endif
while (sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST)
;
/* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
sio_set(up, TXX9_SIFCR,
TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
/* initial settings */
sio_out(up, TXX9_SILCR,
TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
((up->port.flags & UPF_TXX9_USE_SCLK) ?
TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
sio_quot_set(up, uart_get_divisor(port, 9600));
sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static int
serial_txx9_verify_port(struct uart_port *port, struct serial_struct *ser)
{
unsigned long new_port = ser->port;
if (HIGH_BITS_OFFSET)
new_port += (unsigned long)ser->port_high << HIGH_BITS_OFFSET;
if (ser->type != port->type ||
ser->irq != port->irq ||
ser->io_type != port->iotype ||
new_port != port->iobase ||
(unsigned long)ser->iomem_base != port->mapbase)
return -EINVAL;
return 0;
}
static const char *
serial_txx9_type(struct uart_port *port)
{
return "txx9";
}
static struct uart_ops serial_txx9_pops = {
.tx_empty = serial_txx9_tx_empty,
.set_mctrl = serial_txx9_set_mctrl,
.get_mctrl = serial_txx9_get_mctrl,
.stop_tx = serial_txx9_stop_tx,
.start_tx = serial_txx9_start_tx,
.stop_rx = serial_txx9_stop_rx,
.enable_ms = serial_txx9_enable_ms,
.break_ctl = serial_txx9_break_ctl,
.startup = serial_txx9_startup,
.shutdown = serial_txx9_shutdown,
.set_termios = serial_txx9_set_termios,
.pm = serial_txx9_pm,
.type = serial_txx9_type,
.release_port = serial_txx9_release_port,
.request_port = serial_txx9_request_port,
.config_port = serial_txx9_config_port,
.verify_port = serial_txx9_verify_port,
};
static struct uart_txx9_port serial_txx9_ports[UART_NR];
static void __init serial_txx9_register_ports(struct uart_driver *drv)
{
int i;
for (i = 0; i < UART_NR; i++) {
struct uart_txx9_port *up = &serial_txx9_ports[i];
up->port.line = i;
up->port.ops = &serial_txx9_pops;
if (up->port.iobase || up->port.mapbase)
uart_add_one_port(drv, &up->port);
}
}
#ifdef CONFIG_SERIAL_TXX9_CONSOLE
/*
* Wait for transmitter & holding register to empty
*/
static inline void wait_for_xmitr(struct uart_txx9_port *up)
{
unsigned int tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
while (--tmout &&
!(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
udelay(1);
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
tmout = 1000000;
while (--tmout &&
(sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
udelay(1);
}
}
static void serial_txx9_console_putchar(struct uart_port *port, int ch)
{
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
wait_for_xmitr(up);
sio_out(up, TXX9_SITFIFO, ch);
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console_lock must be held when we get here.
*/
static void
serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_txx9_port *up = &serial_txx9_ports[co->index];
unsigned int ier, flcr;
/*
* First save the UER then disable the interrupts
*/
ier = sio_in(up, TXX9_SIDICR);
sio_out(up, TXX9_SIDICR, 0);
/*
* Disable flow-control if enabled (and unnecessary)
*/
flcr = sio_in(up, TXX9_SIFLCR);
if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
sio_out(up, TXX9_SIFLCR, flcr);
sio_out(up, TXX9_SIDICR, ier);
}
static int serial_txx9_console_setup(struct console *co, char *options)
{
struct uart_port *port;
struct uart_txx9_port *up;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index >= UART_NR)
co->index = 0;
up = &serial_txx9_ports[co->index];
port = &up->port;
if (!port->ops)
return -ENODEV;
/*
* Disable UART interrupts, set DTR and RTS high
* and set speed.
*/
sio_out(up, TXX9_SIDICR, 0);
/* initial settings */
sio_out(up, TXX9_SILCR,
TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
((port->flags & UPF_TXX9_USE_SCLK) ?
TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver serial_txx9_reg;
static struct console serial_txx9_console = {
.name = TXX9_TTY_NAME,
.write = serial_txx9_console_write,
.device = uart_console_device,
.setup = serial_txx9_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &serial_txx9_reg,
};
static int __init serial_txx9_console_init(void)
{
register_console(&serial_txx9_console);
return 0;
}
console_initcall(serial_txx9_console_init);
#define SERIAL_TXX9_CONSOLE &serial_txx9_console
#else
#define SERIAL_TXX9_CONSOLE NULL
#endif
static struct uart_driver serial_txx9_reg = {
.owner = THIS_MODULE,
.driver_name = "serial_txx9",
.dev_name = TXX9_TTY_NAME,
.major = TXX9_TTY_MAJOR,
.minor = TXX9_TTY_MINOR_START,
.nr = UART_NR,
.cons = SERIAL_TXX9_CONSOLE,
};
int __init early_serial_txx9_setup(struct uart_port *port)
{
if (port->line >= ARRAY_SIZE(serial_txx9_ports))
return -ENODEV;
serial_txx9_ports[port->line].port = *port;
serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
serial_txx9_ports[port->line].port.flags |= UPF_BOOT_AUTOCONF;
return 0;
}
#ifdef ENABLE_SERIAL_TXX9_PCI
/**
* serial_txx9_suspend_port - suspend one serial port
* @line: serial line number
*
* Suspend one serial port.
*/
static void serial_txx9_suspend_port(int line)
{
uart_suspend_port(&serial_txx9_reg, &serial_txx9_ports[line].port);
}
/**
* serial_txx9_resume_port - resume one serial port
* @line: serial line number
*
* Resume one serial port.
*/
static void serial_txx9_resume_port(int line)
{
uart_resume_port(&serial_txx9_reg, &serial_txx9_ports[line].port);
}
static DEFINE_MUTEX(serial_txx9_mutex);
/**
* serial_txx9_register_port - register a serial port
* @port: serial port template
*
* Configure the serial port specified by the request.
*
* The port is then probed and if necessary the IRQ is autodetected
* If this fails an error is returned.
*
* On success the port is ready to use and the line number is returned.
*/
static int __devinit serial_txx9_register_port(struct uart_port *port)
{
int i;
struct uart_txx9_port *uart;
int ret = -ENOSPC;
mutex_lock(&serial_txx9_mutex);
for (i = 0; i < UART_NR; i++) {
uart = &serial_txx9_ports[i];
if (!(uart->port.iobase || uart->port.mapbase))
break;
}
if (i < UART_NR) {
uart->port.iobase = port->iobase;
uart->port.membase = port->membase;
uart->port.irq = port->irq;
uart->port.uartclk = port->uartclk;
uart->port.iotype = port->iotype;
uart->port.flags = port->flags | UPF_BOOT_AUTOCONF;
uart->port.mapbase = port->mapbase;
if (port->dev)
uart->port.dev = port->dev;
ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
if (ret == 0)
ret = uart->port.line;
}
mutex_unlock(&serial_txx9_mutex);
return ret;
}
/**
* serial_txx9_unregister_port - remove a txx9 serial port at runtime
* @line: serial line number
*
* Remove one serial port. This may not be called from interrupt
* context. We hand the port back to the our control.
*/
static void __devexit serial_txx9_unregister_port(int line)
{
struct uart_txx9_port *uart = &serial_txx9_ports[line];
mutex_lock(&serial_txx9_mutex);
uart_remove_one_port(&serial_txx9_reg, &uart->port);
uart->port.flags = 0;
uart->port.type = PORT_UNKNOWN;
uart->port.iobase = 0;
uart->port.mapbase = 0;
uart->port.membase = NULL;
uart->port.dev = NULL;
mutex_unlock(&serial_txx9_mutex);
}
/*
* Probe one serial board. Unfortunately, there is no rhyme nor reason
* to the arrangement of serial ports on a PCI card.
*/
static int __devinit
pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
{
struct uart_port port;
int line;
int rc;
rc = pci_enable_device(dev);
if (rc)
return rc;
memset(&port, 0, sizeof(port));
port.ops = &serial_txx9_pops;
port.flags |= UPF_TXX9_HAVE_CTS_LINE;
port.uartclk = 66670000;
port.irq = dev->irq;
port.iotype = UPIO_PORT;
port.iobase = pci_resource_start(dev, 1);
port.dev = &dev->dev;
line = serial_txx9_register_port(&port);
if (line < 0) {
printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
}
pci_set_drvdata(dev, (void *)(long)line);
return 0;
}
static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev)
{
int line = (int)(long)pci_get_drvdata(dev);
pci_set_drvdata(dev, NULL);
if (line) {
serial_txx9_unregister_port(line);
pci_disable_device(dev);
}
}
static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
{
int line = (int)(long)pci_get_drvdata(dev);
if (line)
serial_txx9_suspend_port(line);
pci_save_state(dev);
pci_set_power_state(dev, pci_choose_state(dev, state));
return 0;
}
static int pciserial_txx9_resume_one(struct pci_dev *dev)
{
int line = (int)(long)pci_get_drvdata(dev);
pci_set_power_state(dev, PCI_D0);
pci_restore_state(dev);
if (line) {
pci_enable_device(dev);
serial_txx9_resume_port(line);
}
return 0;
}
static struct pci_device_id serial_txx9_pci_tbl[] = {
{ PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC,
PCI_ANY_ID, PCI_ANY_ID,
0, 0, 0 },
{ 0, }
};
static struct pci_driver serial_txx9_pci_driver = {
.name = "serial_txx9",
.probe = pciserial_txx9_init_one,
.remove = __devexit_p(pciserial_txx9_remove_one),
.suspend = pciserial_txx9_suspend_one,
.resume = pciserial_txx9_resume_one,
.id_table = serial_txx9_pci_tbl,
};
MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
#endif /* ENABLE_SERIAL_TXX9_PCI */
static int __init serial_txx9_init(void)
{
int ret;
printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
ret = uart_register_driver(&serial_txx9_reg);
if (ret >= 0) {
serial_txx9_register_ports(&serial_txx9_reg);
#ifdef ENABLE_SERIAL_TXX9_PCI
ret = pci_register_driver(&serial_txx9_pci_driver);
#endif
}
return ret;
}
static void __exit serial_txx9_exit(void)
{
int i;
#ifdef ENABLE_SERIAL_TXX9_PCI
pci_unregister_driver(&serial_txx9_pci_driver);
#endif
for (i = 0; i < UART_NR; i++) {
struct uart_txx9_port *up = &serial_txx9_ports[i];
if (up->port.iobase || up->port.mapbase)
uart_remove_one_port(&serial_txx9_reg, &up->port);
}
uart_unregister_driver(&serial_txx9_reg);
}
module_init(serial_txx9_init);
module_exit(serial_txx9_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TX39/49 serial driver");
MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);
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