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kernel / pub / scm / linux / kernel / git / wtarreau / linux-2.4 / db7bb51987c369ff0b356061385bc03c85ee5511 / . / drivers / char / serial_txx927.c
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/*
* drivers/char/serial_txx927.c
* driver for TX[34]927 SIO
*
* Copyright 2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ahennessy@mvista.com
*
* Based on drivers/char/serial.c
*
* Copyright (C) 2000-2001 Toshiba Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define SERIAL_DO_RESTART
/* Set of debugging defines */
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
#undef SERIAL_DEBUG_PCI
#undef SERIAL_DEBUG_AUTOCONF
#ifdef MODULE
#undef CONFIG_TXX927_SERIAL_CONSOLE
#endif
#define CONFIG_SERIAL_RSA
#define RS_STROBE_TIME (10*HZ)
#define RS_ISR_PASS_LIMIT 256
/*
* End of serial driver configuration section.
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/circ_buf.h>
#include <linux/serial_reg.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/serialP.h>
#include <linux/delay.h>
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
#include <linux/console.h>
#endif
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#endif
#include <asm/system.h>
#include <asm/serial.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>
#include <asm/jmr3927/txx927.h>
#include <asm/bootinfo.h>
#ifdef CONFIG_TOSHIBA_JMR3927
#include <asm/jmr3927/jmr3927.h>
#endif
#define _INLINE_ inline
#ifdef CONFIG_MAC_SERIAL
#define SERIAL_DEV_OFFSET 2
#else
#define SERIAL_DEV_OFFSET 0
#endif
static char *serial_name = "TXx927 Serial driver";
static char *serial_version = "0.02";
static DECLARE_TASK_QUEUE(tq_serial);
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
static struct timer_list serial_timer;
extern unsigned long get_txx927_uart_baud(void);
/* serial subtype definitions */
#ifndef SERIAL_TYPE_NORMAL
#define SERIAL_TYPE_NORMAL 1
#define SERIAL_TYPE_CALLOUT 2
#endif
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/*
* IRQ_timeout - How long the timeout should be for each IRQ
* should be after the IRQ has been active.
*/
static struct async_struct *IRQ_ports[NR_IRQS];
static int IRQ_timeout[NR_IRQS];
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
static struct console sercons;
#endif
#if defined(CONFIG_TXX927_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static unsigned long break_pressed; /* break, really ... */
#endif
static void change_speed(struct async_struct *info, struct termios *old);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
#ifndef PREPARE_FUNC
#define PREPARE_FUNC(dev) (dev->prepare)
#define ACTIVATE_FUNC(dev) (dev->activate)
#define DEACTIVATE_FUNC(dev) (dev->deactivate)
#endif
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
#else
#define DBG_CNT(s)
#endif
#define SERIAL_DRIVER_NAME "TXx927SIO"
#ifdef CONFIG_SERIAL
/* "ttyS","cua" is used for standard serial driver */
#define TXX927_TTY_NAME "ttySC"
#define TXX927_TTY_MINOR_START (64 + 16) /* ttySC0(80), ttySC1(81) */
#define TXX927_CU_NAME "cuac"
#define TXX927_SERIAL_BH TXX927SERIAL_BH
#else
/* acts like standard serial driver */
#define TXX927_TTY_NAME "ttyS"
#define TXX927_TTY_MINOR_START 64
#define TXX927_CU_NAME "cua"
#define TXX927_SERIAL_BH SERIAL_BH
#endif
#define TXX927_TTY_MAJOR TTY_MAJOR
#define TXX927_TTYAUX_MAJOR TTYAUX_MAJOR
#define ASYNC_HAVE_CTS_LINE ASYNC_BOOT_AUTOCONF /* reuse */
static struct serial_state rs_table[RS_TABLE_SIZE] = {
SERIAL_PORT_DFNS /* Defined in serial.h */
};
#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf;
#ifdef DECLARE_MUTEX
static DECLARE_MUTEX(tmp_buf_sem);
#else
static struct semaphore tmp_buf_sem = MUTEX;
#endif
static inline int serial_paranoia_check(struct async_struct *info,
kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for serial struct (%s) in %s\n";
static const char *badinfo =
"Warning: null async_struct for (%s) in %s\n";
if (!info) {
printk(badinfo, kdevname(device), routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, kdevname(device), routine);
return 1;
}
#endif
return 0;
}
static inline struct txx927_sio_reg *sio_reg(struct async_struct *info)
{
return (struct txx927_sio_reg *)info->port;
}
/*
* Wait for transmitter & holding register to empty
*/
static inline void wait_for_xmitr(struct async_struct *info)
{
unsigned int tmout = 1000000;
do {
if (--tmout == 0) break;
} while (!(sio_reg(info)->cisr & TXx927_SICISR_TXALS));
}
/*
* ------------------------------------------------------------
* rs_stop() and rs_start()
*
* This routines are called before setting or resetting tty->stopped.
* They enable or disable transmitter interrupts, as necessary.
* ------------------------------------------------------------
*/
static void rs_stop(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_stop"))
return;
save_flags(flags); cli();
if (info->IER & UART_IER_THRI) {
info->IER &= ~UART_IER_THRI;
sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
}
restore_flags(flags);
}
static void rs_start(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_start"))
return;
save_flags(flags); cli();
if (info->xmit.head != info->xmit.tail
&& info->xmit.buf
&& !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
}
restore_flags(flags);
}
/*
* ----------------------------------------------------------------------
*
* Here starts the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* rs_interrupt(). They were separated out for readability's sake.
*
* Note: rs_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* rs_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
*
* and look at the resulting assemble code in serial.s.
*
* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
* -----------------------------------------------------------------------
*/
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static _INLINE_ void rs_sched_event(struct async_struct *info,
int event)
{
info->event |= 1 << event;
queue_task(&info->tqueue, &tq_serial);
mark_bh(TXX927_SERIAL_BH);
}
static _INLINE_ void receive_chars(struct async_struct *info,
int *status)
{
struct tty_struct *tty = info->tty;
unsigned char ch;
int ignored = 0;
struct async_icount *icount;
icount = &info->state->icount;
do {
ch = sio_reg(info)->rfifo;
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
break;
*tty->flip.char_buf_ptr = ch;
icount->rx++;
#ifdef SERIAL_DEBUG_INTR
printk("DR%02x:%02x...", ch, *status);
#endif
*tty->flip.flag_buf_ptr = 0;
if (*status & (TXx927_SIDISR_UBRK | TXx927_SIDISR_UPER |
TXx927_SIDISR_UFER | TXx927_SIDISR_UOER)) {
/*
* For statistics only
*/
if (*status & TXx927_SIDISR_UBRK) {
*status &= ~(TXx927_SIDISR_UFER | TXx927_SIDISR_UPER);
icount->brk++;
} else if (*status & TXx927_SIDISR_UPER)
icount->parity++;
else if (*status & TXx927_SIDISR_UFER)
icount->frame++;
if (*status & TXx927_SIDISR_UOER)
icount->overrun++;
/*
* Now check to see if character should be
* ignored, and mask off conditions which
* should be ignored.
*/
if (*status & info->ignore_status_mask) {
if (++ignored > 100)
break;
goto ignore_char;
}
*status &= info->read_status_mask;
if (*status & (TXx927_SIDISR_UBRK)) {
#ifdef SERIAL_DEBUG_INTR
printk("handling break....");
#endif
*tty->flip.flag_buf_ptr = TTY_BREAK;
if (info->flags & ASYNC_SAK)
do_SAK(tty);
} else if (*status & TXx927_SIDISR_UPER)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (*status & TXx927_SIDISR_UFER)
*tty->flip.flag_buf_ptr = TTY_FRAME;
if (*status & TXx927_SIDISR_UOER) {
/*
* Overrun is special, since it's
* reported immediately, and doesn't
* affect the current character
*/
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
tty->flip.count++;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
}
}
}
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
ignore_char:
*status = sio_reg(info)->disr;
} while (!(*status & TXx927_SIDISR_UVALID));
tty_flip_buffer_push(tty);
}
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
int count;
wait_for_xmitr(info);
if (info->x_char) {
sio_reg(info)->tfifo = info->x_char;
info->state->icount.tx++;
info->x_char = 0;
if (intr_done)
*intr_done = 0;
return;
}
if (info->xmit.head == info->xmit.tail
|| info->tty->stopped
|| info->tty->hw_stopped) {
sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
return;
}
count = info->xmit_fifo_size;
do {
sio_reg(info)->tfifo = info->xmit.buf[info->xmit.tail++];
info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
info->state->icount.tx++;
if (info->xmit.head == info->xmit.tail)
break;
} while (--count > 0);
if (CIRC_CNT(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
#endif
if (intr_done)
*intr_done = 0;
if (info->xmit.head == info->xmit.tail) {
sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
}
}
static _INLINE_ void check_modem_status(struct async_struct *info)
{
/* RTS/CTS are controled by HW. (if possible) */
}
/*
* This is the serial driver's interrupt routine for a single port
*/
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
int status;
int pass_counter = 0;
struct async_struct * info;
#ifdef SERIAL_DEBUG_INTR
printk("rs_interrupt_single(%d)...", irq);
#endif
info = IRQ_ports[irq];
if (!info || !info->tty)
return;
do {
status = sio_reg(info)->disr;
#ifdef SERIAL_DEBUG_INTR
printk("status = %x...", status);
#endif
if (!(sio_reg(info)->dicr & TXx927_SIDICR_TIE))
status &= ~TXx927_SIDISR_TDIS;
if (!(status & (TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT)))
break;
if (status & TXx927_SIDISR_RDIS)
receive_chars(info, &status);
check_modem_status(info);
if (status & TXx927_SIDISR_TDIS)
transmit_chars(info, 0);
/* Clear TX/RX Int. Status */
sio_reg(info)->disr &= ~(TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT);
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#ifdef SERIAL_DEBUG_INTR
printk("rs_single loop break.\n");
#endif
break;
}
} while (1);
info->last_active = jiffies;
#ifdef SERIAL_DEBUG_INTR
printk("end.\n");
#endif
}
/*
* -------------------------------------------------------------------
* Here ends the serial interrupt routines.
* -------------------------------------------------------------------
*/
/*
* This routine is used to handle the "bottom half" processing for the
* serial driver, known also the "software interrupt" processing.
* This processing is done at the kernel interrupt level, after the
* rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
* is where time-consuming activities which can not be done in the
* interrupt driver proper are done; the interrupt driver schedules
* them using rs_sched_event(), and they get done here.
*/
static void do_serial_bh(void)
{
run_task_queue(&tq_serial);
}
static void do_softint(void *private_)
{
struct async_struct *info = (struct async_struct *) private_;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
tty_wakeup(tty);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
}
}
/*
* This subroutine is called when the RS_TIMER goes off. It is used
* by the serial driver to handle ports that do not have an interrupt
* (irq=0). This doesn't work very well for 16450's, but gives barely
* passable results for a 16550A. (Although at the expense of much
* CPU overhead).
*/
static void rs_timer(unsigned long dummy)
{
static unsigned long last_strobe;
struct async_struct *info;
unsigned int i;
unsigned long flags;
if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
for (i=0; i < NR_IRQS; i++) {
info = IRQ_ports[i];
if (!info)
continue;
save_flags(flags); cli();
rs_interrupt_single(i, NULL, NULL);
restore_flags(flags);
}
}
last_strobe = jiffies;
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
#if 0
if (IRQ_ports[0]) {
save_flags(flags); cli();
rs_interrupt_single(0, NULL, NULL);
restore_flags(flags);
mod_timer(&serial_timer, jiffies + IRQ_timeout[0]);
}
#endif
}
/*
* ---------------------------------------------------------------
* Low level utility subroutines for the serial driver: routines to
* figure out the appropriate timeout for an interrupt chain, routines
* to initialize and startup a serial port, and routines to shutdown a
* serial port. Useful stuff like that.
* ---------------------------------------------------------------
*/
/*
* This routine figures out the correct timeout for a particular IRQ.
* It uses the smallest timeout of all of the serial ports in a
* particular interrupt chain. Now only used for IRQ 0....
*/
static void figure_IRQ_timeout(int irq)
{
struct async_struct *info;
int timeout = 60*HZ; /* 60 seconds === a long time :-) */
info = IRQ_ports[irq];
if (!info) {
IRQ_timeout[irq] = 60*HZ;
return;
}
while (info) {
if (info->timeout < timeout)
timeout = info->timeout;
info = info->next_port;
}
if (!irq)
timeout = timeout / 2;
IRQ_timeout[irq] = timeout ? timeout : 1;
}
static int startup(struct async_struct * info)
{
unsigned long flags;
int retval=0;
struct serial_state *state= info->state;
unsigned long page;
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
save_flags(flags); cli();
if (info->flags & ASYNC_INITIALIZED) {
free_page(page);
goto errout;
}
if (!state->port) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
free_page(page);
goto errout;
}
if (info->xmit.buf)
free_page(page);
else
info->xmit.buf = (unsigned char *) page;
#ifdef SERIAL_DEBUG_OPEN
printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif
/*
* Clear the FIFO buffers and disable them
* (they will be reenabled in change_speed())
*/
sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
TXx927_SIFCR_FRSTE;
/* clear reset */
sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
TXx927_SIFCR_FRSTE);
/*
* Allocate the IRQ if necessary
*/
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
retval = -EBUSY;
goto errout;
}
retval = request_irq(state->irq, rs_interrupt_single,
SA_INTERRUPT,
"txx927serial", NULL);
if (retval) {
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR,
&info->tty->flags);
retval = 0;
}
goto errout;
}
}
/*
* Insert serial port into IRQ chain.
*/
info->prev_port = 0;
info->next_port = IRQ_ports[state->irq];
if (info->next_port)
info->next_port->prev_port = info;
IRQ_ports[state->irq] = info;
figure_IRQ_timeout(state->irq);
/*
* Clear the interrupt registers.
*/
sio_reg(info)->disr = 0;
/*
* Now, initialize the UART
*/
/* HW RTS/CTS control */
if (state->flags & ASYNC_HAVE_CTS_LINE)
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
/* Enable RX/TX */
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
/*
* Finally, enable interrupts
*/
sio_reg(info)->dicr = TXx927_SIDICR_RIE;
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit.head = info->xmit.tail = 0;
/*
* Set up the tty->alt_speed kludge
*/
if (info->tty) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
/*
* and set the speed of the serial port
*/
change_speed(info, 0);
info->flags |= ASYNC_INITIALIZED;
restore_flags(flags);
return 0;
errout:
restore_flags(flags);
return retval;
}
/*
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
*/
static void shutdown(struct async_struct * info)
{
unsigned long flags;
struct serial_state *state;
int retval;
if (!(info->flags & ASYNC_INITIALIZED))
return;
state = info->state;
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....", info->line,
state->irq);
#endif
save_flags(flags); cli(); /* Disable interrupts */
/*
* First unlink the serial port from the IRQ chain...
*/
if (info->next_port)
info->next_port->prev_port = info->prev_port;
if (info->prev_port)
info->prev_port->next_port = info->next_port;
else
IRQ_ports[state->irq] = info->next_port;
figure_IRQ_timeout(state->irq);
/*
* Free the IRQ, if necessary
*/
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
free_irq(state->irq, NULL);
retval = request_irq(state->irq, rs_interrupt_single,
SA_INTERRUPT, "txx927serial", NULL);
if (retval)
printk(KERN_WARNING "txx927serial shutdown: request_irq: error %d"
" Couldn't reacquire IRQ.\n", retval);
} else
free_irq(state->irq, NULL);
}
if (info->xmit.buf) {
free_page((unsigned long) info->xmit.buf);
info->xmit.buf = 0;
}
sio_reg(info)->dicr = 0; /* disable all intrs */
/* disable break condition */
sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
/* drop RTS */
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
/* TXx927-SIO can not control DTR... */
}
/* reset FIFO's */
sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
TXx927_SIFCR_FRSTE;
/* clear reset */
sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
TXx927_SIFCR_FRSTE);
/* DON'T disable Rx/Tx here, ie. DON'T set either
* TXx927_SIFLCR_RSDE or TXx927_SIFLCR_TSDE in flcr
*/
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
restore_flags(flags);
}
/*
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
*/
static void change_speed(struct async_struct *info,
struct termios *old_termios)
{
int quot = 0, baud_base, baud;
unsigned cflag, cval;
int bits;
unsigned long flags;
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
if (!info->port)
return;
cval = sio_reg(info)->lcr;
/* byte size and parity */
cval &= ~TXx927_SILCR_UMODE_MASK;
switch (cflag & CSIZE) {
case CS7:
cval |= TXx927_SILCR_UMODE_7BIT;
bits = 9;
break;
case CS5: /* not supported */
case CS6: /* not supported */
case CS8:
default:
cval |= TXx927_SILCR_UMODE_8BIT;
bits = 10;
break;
}
cval &= ~TXx927_SILCR_USBL_MASK;
if (cflag & CSTOPB) {
cval |= TXx927_SILCR_USBL_2BIT;
bits++;
} else {
cval |= TXx927_SILCR_USBL_1BIT;
}
cval &= ~(TXx927_SILCR_UPEN|TXx927_SILCR_UEPS);
if (cflag & PARENB) {
cval |= TXx927_SILCR_UPEN;
bits++;
}
if (!(cflag & PARODD))
cval |= TXx927_SILCR_UEPS;
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600; /* B0 transition handled in rs_set_termios */
baud_base = info->state->baud_base;
quot = (baud_base + baud / 2) / baud;
/* If the quotient is zero refuse the change */
if (!quot && old_termios) {
info->tty->termios->c_cflag &= ~CBAUD;
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
quot = (baud_base + baud / 2) / baud;
}
/* As a last resort, if the quotient is zero, default to 9600 bps */
if (!quot)
quot = (baud_base + 9600 / 2) / 9600;
info->quot = quot;
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
info->timeout += HZ/50; /* Add .02 seconds of slop */
/* CTS flow control flag */
if (cflag & CRTSCTS) {
info->flags |= ASYNC_CTS_FLOW;
if (info->state->flags & ASYNC_HAVE_CTS_LINE)
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
} else {
info->flags &= ~ASYNC_CTS_FLOW;
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
}
/*
* Set up parity check flag
*/
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
info->read_status_mask = TXx927_SIDISR_UOER |
TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS;
if (I_INPCK(info->tty))
info->read_status_mask |= TXx927_SIDISR_UFER | TXx927_SIDISR_UPER;
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
info->read_status_mask |= TXx927_SIDISR_UBRK;
/*
* Characters to ignore
*/
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= TXx927_SIDISR_UPER | TXx927_SIDISR_UFER;
if (I_IGNBRK(info->tty)) {
info->ignore_status_mask |= TXx927_SIDISR_UBRK;
/*
* If we're ignore parity and break indicators, ignore
* overruns too. (For real raw support).
*/
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= TXx927_SIDISR_UOER;
}
/*
* !!! ignore all characters if CREAD is not set
*/
if ((cflag & CREAD) == 0)
info->ignore_status_mask |= TXx927_SIDISR_RDIS;
save_flags(flags); cli();
sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
restore_flags(flags);
}
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_put_char"))
return;
if (!tty || !info->xmit.buf)
return;
save_flags(flags); cli();
if (CIRC_SPACE(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) == 0) {
restore_flags(flags);
return;
}
info->xmit.buf[info->xmit.head++] = ch;
info->xmit.head &= SERIAL_XMIT_SIZE-1;
restore_flags(flags);
}
static void rs_flush_chars(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
return;
if (info->xmit.head == info->xmit.tail
|| tty->stopped
|| tty->hw_stopped
|| !info->xmit.buf)
return;
save_flags(flags); cli();
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
restore_flags(flags);
}
static int rs_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
int c, ret = 0;
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_write"))
return 0;
if (!tty || !info->xmit.buf || !tmp_buf)
return 0;
save_flags(flags);
if (from_user) {
down(&tmp_buf_sem);
while (1) {
int c1;
c = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0)
break;
c -= copy_from_user(tmp_buf, buf, c);
if (!c) {
if (!ret)
ret = -EFAULT;
break;
}
cli();
c1 = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (c1 < c)
c = c1;
memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
info->xmit.head = ((info->xmit.head + c) &
(SERIAL_XMIT_SIZE-1));
restore_flags(flags);
buf += c;
count -= c;
ret += c;
}
up(&tmp_buf_sem);
} else {
cli();
while (1) {
c = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0) {
break;
}
memcpy(info->xmit.buf + info->xmit.head, buf, c);
info->xmit.head = ((info->xmit.head + c) &
(SERIAL_XMIT_SIZE-1));
buf += c;
count -= c;
ret += c;
}
restore_flags(flags);
}
if (info->xmit.head != info->xmit.tail
&& !tty->stopped
&& !tty->hw_stopped
&& !(info->IER & UART_IER_THRI))
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
return ret;
}
static int rs_write_room(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_write_room"))
return 0;
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static int rs_chars_in_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
return 0;
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static void rs_flush_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
return;
save_flags(flags); cli();
info->xmit.head = info->xmit.tail = 0;
restore_flags(flags);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
tty_wakeup(tty);
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_send_char"))
return;
info->x_char = ch;
if (ch) {
/* Make sure transmit interrupts are on */
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
}
}
/*
* ------------------------------------------------------------
* rs_throttle()
*
* This routine is called by the upper-layer tty layer to signal that
* incoming characters should be throttled.
* ------------------------------------------------------------
*/
static void rs_throttle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_throttle"))
return;
if (I_IXOFF(tty))
rs_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS) {
save_flags(flags); cli();
/* drop RTS */
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
restore_flags(flags);
}
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
rs_send_xchar(tty, START_CHAR(tty));
}
if (tty->termios->c_cflag & CRTSCTS) {
save_flags(flags); cli();
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
restore_flags(flags);
}
}
/*
* ------------------------------------------------------------
* rs_ioctl() and friends
* ------------------------------------------------------------
*/
static int get_modem_info(struct async_struct * info, unsigned int *value)
{
unsigned int result;
unsigned long flags;
save_flags(flags); cli();
result = ((sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
| ((sio_reg(info)->cisr & TXx927_SICISR_CTSS) ? 0 : TIOCM_CTS);
restore_flags(flags);
return put_user(result,value);
}
static int set_modem_info(struct async_struct * info, unsigned int cmd,
unsigned int *value)
{
int error;
unsigned int arg;
unsigned long flags;
error = get_user(arg, value);
if (error)
return error;
save_flags(flags); cli();
switch (cmd) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
break;
case TIOCMSET:
sio_reg(info)->flcr =
(sio_reg(info)->flcr & ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE)) |
((arg & TIOCM_RTS) ? 0 : TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
break;
default:
error = -EINVAL;
}
restore_flags(flags);
return error;
}
/*
* rs_break() --- routine which turns the break handling on or off
*/
static void rs_break(struct tty_struct *tty, int break_state)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_break"))
return;
if (!info->port)
return;
save_flags(flags); cli();
if (break_state == -1)
sio_reg(info)->flcr |= TXx927_SIFLCR_TBRK;
else
sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
restore_flags(flags);
}
static int rs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
case TIOCMGET:
return get_modem_info(info, (unsigned int *) arg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
return set_modem_info(info, cmd, (unsigned int *) arg);
return 0;
case TIOCGSERIAL:
printk("TIOCGSERIAL\n");
return 0;
case TIOCSSERIAL:
printk("TIOCSSERIAL\n");
return 0;
case TIOCSERCONFIG:
printk("TIOCSERCONFIG\n");
return 0;
case TIOCSERGETLSR: /* Get line status register */
printk("TIOCSERGETLSR\n");
return 0;
case TIOCSERGSTRUCT:
printk("TIOCSERGSTRUCT\n");
return 0;
/*
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was
*/
case TIOCMIWAIT:
printk("TIOCMIWAIT\n");
return 0;
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
case TIOCGICOUNT:
printk("TIOCGICOUNT\n");
return 0;
case TIOCSERGWILD:
case TIOCSERSWILD:
/* "setserial -W" is called in Debian boot */
printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
if ( (cflag == old_termios->c_cflag)
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
return;
change_speed(info, old_termios);
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) &&
!(cflag & CBAUD)) {
save_flags(flags); cli();
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
restore_flags(flags);
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
(cflag & CBAUD)) {
if (!(tty->termios->c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
save_flags(flags); cli();
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
restore_flags(flags);
}
}
/* Handle turning off CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
rs_start(tty);
}
}
/*
* ------------------------------------------------------------
* rs_close()
*
* This routine is called when the serial port gets closed. First, we
* wait for the last remaining data to be sent. Then, we unlink its
* async structure from the interrupt chain if necessary, and we free
* that IRQ if nothing is left in the chain.
* ------------------------------------------------------------
*/
static void rs_close(struct tty_struct *tty, struct file * filp)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state;
unsigned long flags;
if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
return;
state = info->state;
save_flags(flags); cli();
if (tty_hung_up_p(filp)) {
restore_flags(flags);
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("rs_close ttys%d, count = %d\n", info->line, state->count);
#endif
if ((tty->count == 1) && (state->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. state->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk(KERN_WARNING "rs_close: bad serial port count; tty->count is 1, "
"state->count is %d\n", state->count);
state->count = 1;
}
if (--state->count < 0) {
printk(KERN_WARNING "rs_close: bad serial port count for ttys%d: %d\n",
info->line, state->count);
state->count = 0;
}
if (state->count) {
restore_flags(flags);
return;
}
info->flags |= ASYNC_CLOSING;
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
*/
if (info->flags & ASYNC_NORMAL_ACTIVE)
info->state->normal_termios = *tty->termios;
if (info->flags & ASYNC_CALLOUT_ACTIVE)
info->state->callout_termios = *tty->termios;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (state->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, state->closing_wait);
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
* line status register.
*/
info->read_status_mask &= ~TXx927_SIDISR_RDIS;
if (info->flags & ASYNC_INITIALIZED) {
#if 0
sio_reg(info)->dicr &= ~TXx927_SIDICR_RIE;
#endif
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially
* important if there is a transmit FIFO!
*/
rs_wait_until_sent(tty, info->timeout);
}
shutdown(info);
if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
if (info->blocked_open) {
if (state->close_delay) {
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(state->close_delay);
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
restore_flags(flags);
}
/*
* rs_wait_until_sent() --- wait until the transmitter is empty
*/
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long orig_jiffies, char_time;
int cisr;
if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
return;
if (info->xmit_fifo_size == 0)
return; /* Just in case.... */
orig_jiffies = jiffies;
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
* interval should also be less than the timeout.
*
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout)
char_time = MIN(char_time, timeout);
/*
* If the transmitter hasn't cleared in twice the approximate
* amount of time to send the entire FIFO, it probably won't
* ever clear. This assumes the UART isn't doing flow
* control, which is currently the case. Hence, if it ever
* takes longer than info->timeout, this is probably due to a
* UART bug of some kind. So, we clamp the timeout parameter at
* 2*info->timeout.
*/
if (!timeout || timeout > 2*info->timeout)
timeout = 2*info->timeout;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
while (!((cisr = sio_reg(info)->cisr) & TXx927_SICISR_TXALS)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("cisr = %d (jiff=%lu)...", cisr, jiffies);
#endif
current->state = TASK_INTERRUPTIBLE;
current->counter = 0; /* make us low-priority */
schedule_timeout(char_time);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
current->state = TASK_RUNNING;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("cisr = %d (jiff=%lu)...done\n", cisr, jiffies);
#endif
}
/*
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
static void rs_hangup(struct tty_struct *tty)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state = info->state;
if (serial_paranoia_check(info, tty->device, "rs_hangup"))
return;
state = info->state;
rs_flush_buffer(tty);
shutdown(info);
info->event = 0;
state->count = 0;
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
info->tty = 0;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* rs_open() and friends
* ------------------------------------------------------------
*/
static int block_til_ready(struct tty_struct *tty, struct file * filp,
struct async_struct *info)
{
DECLARE_WAITQUEUE(wait, current);
struct serial_state *state = info->state;
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
/*
* If this is a callout device, then just make sure the normal
* device isn't being used.
*/
if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
if (info->flags & ASYNC_NORMAL_ACTIVE)
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_SESSION_LOCKOUT) &&
(info->session != current->session))
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_PGRP_LOCKOUT) &&
(info->pgrp != current->pgrp))
return -EBUSY;
info->flags |= ASYNC_CALLOUT_ACTIVE;
return 0;
}
/*
* If non-blocking mode is set, or the port is not enabled,
* then make the check up front and then exit.
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
if (info->flags & ASYNC_CALLOUT_ACTIVE)
return -EBUSY;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (info->flags & ASYNC_CALLOUT_ACTIVE) {
if (state->normal_termios.c_cflag & CLOCAL)
do_clocal = 1;
} else {
if (tty->termios->c_cflag & CLOCAL)
do_clocal = 1;
}
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, state->count is dropped by one, so that
* rs_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready before block: ttys%d, count = %d\n",
state->line, state->count);
#endif
save_flags(flags); cli();
if (!tty_hung_up_p(filp)) {
extra_count = 1;
state->count--;
}
restore_flags(flags);
info->blocked_open++;
while (1) {
save_flags(flags); cli();
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
(tty->termios->c_cflag & CBAUD))
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
restore_flags(flags);
current->state = TASK_INTERRUPTIBLE;
if (tty_hung_up_p(filp) ||
!(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
if (info->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
#else
retval = -EAGAIN;
#endif
break;
}
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
!(info->flags & ASYNC_CLOSING))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
if (extra_count)
state->count++;
info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
if (retval)
return retval;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
static int get_async_struct(int line, struct async_struct **ret_info)
{
struct async_struct *info;
struct serial_state *sstate;
#ifdef REMOTE_DEBUG
if (kdb_port_info.state && line == kdb_port_info.line)
return -ENODEV;
#endif
sstate = rs_table + line;
sstate->count++;
if (sstate->info) {
*ret_info = sstate->info;
return 0;
}
info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
if (!info) {
sstate->count--;
return -ENOMEM;
}
memset(info, 0, sizeof(struct async_struct));
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->delta_msr_wait);
info->magic = SERIAL_MAGIC;
info->port = sstate->port;
info->flags = sstate->flags;
info->io_type = sstate->io_type;
info->xmit_fifo_size = sstate->xmit_fifo_size;
info->line = line;
info->tqueue.routine = do_softint;
info->tqueue.data = info;
info->state = sstate;
if (sstate->info) {
kfree(info);
*ret_info = sstate->info;
return 0;
}
*ret_info = sstate->info = info;
return 0;
}
/*
* This routine is called whenever a serial port is opened. It
* enables interrupts for a serial port, linking in its async structure into
* the IRQ chain. It also performs the serial-specific
* initialization for the tty structure.
*/
static int rs_open(struct tty_struct *tty, struct file * filp)
{
struct async_struct *info;
int retval, line;
unsigned long page;
line = MINOR(tty->device) - tty->driver.minor_start;
if ((line < 0) || (line >= NR_PORTS)) {
return -ENODEV;
}
retval = get_async_struct(line, &info);
if (retval) {
return retval;
}
tty->driver_data = info;
info->tty = tty;
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
info->state->count);
#endif
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
if (!tmp_buf) {
page = get_free_page(GFP_KERNEL);
if (!page) {
return -ENOMEM;
}
if (tmp_buf)
free_page(page);
else
tmp_buf = (unsigned char *) page;
}
/*
* If the port is the middle of closing, bail out now
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
/*
* Start up serial port
*/
retval = startup(info);
if (retval) {
return retval;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open returning after block_til_ready with %d\n",
retval);
#endif
return retval;
}
if ((info->state->count == 1) &&
(info->flags & ASYNC_SPLIT_TERMIOS)) {
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
*tty->termios = info->state->normal_termios;
else
*tty->termios = info->state->callout_termios;
change_speed(info, 0);
}
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
if (sercons.cflag && sercons.index == line) {
tty->termios->c_cflag = sercons.cflag;
sercons.cflag = 0;
change_speed(info, 0);
}
#endif
info->session = current->session;
info->pgrp = current->pgrp;
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open ttys%d successful...", info->line);
#endif
return 0;
}
/*
* /proc fs routines....
*/
static inline int line_info(char *buf, struct serial_state *state)
{
struct async_struct *info = state->info, scr_info;
char stat_buf[30];
int ret;
unsigned long flags;
ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
state->line, SERIAL_DRIVER_NAME,
state->port, state->irq);
if (!state->port) {
ret += sprintf(buf+ret, "\n");
return ret;
}
/*
* Figure out the current RS-232 lines
*/
if (!info) {
info = &scr_info; /* This is just for serial_{in,out} */
info->magic = SERIAL_MAGIC;
info->port = state->port;
info->flags = state->flags;
info->quot = 0;
info->tty = 0;
}
stat_buf[0] = 0;
stat_buf[1] = 0;
save_flags(flags); cli();
if (!(sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC))
strcat(stat_buf, "|RTS");
if (!(sio_reg(info)->cisr & TXx927_SICISR_CTSS))
strcat(stat_buf, "|CTS");
restore_flags(flags);
if (info->quot) {
ret += sprintf(buf+ret, " baud:%d",
state->baud_base / info->quot);
}
ret += sprintf(buf+ret, " tx:%d rx:%d",
state->icount.tx, state->icount.rx);
if (state->icount.frame)
ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
if (state->icount.parity)
ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
if (state->icount.brk)
ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
if (state->icount.overrun)
ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
/*
* Last thing is the RS-232 status lines
*/
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
return ret;
}
static int rs_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int i, len = 0, l;
off_t begin = 0;
len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
for (i = 0; i < NR_PORTS && len < 4000; i++) {
l = line_info(page + len, &rs_table[i]);
len += l;
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
}
*eof = 1;
done:
if (off >= len+begin)
return 0;
*start = page + (begin-off);
return ((count < begin+len-off) ? count : begin+len-off);
}
/*
* ---------------------------------------------------------------------
* rs_init() and friends
*
* rs_init() is called at boot-time to initialize the serial driver.
* ---------------------------------------------------------------------
*/
/*
* This routine prints out the appropriate serial driver version
* number, and identifies which options were configured into this
* driver.
*/
static _INLINE_ void show_serial_version(void)
{
printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
}
/*
* The serial driver boot-time initialization code!
*/
static int __init rs_init(void)
{
int i;
struct serial_state * state;
if (rs_table[0].port == 0)
return -ENODEV;
init_bh(TXX927_SERIAL_BH, do_serial_bh);
init_timer(&serial_timer);
serial_timer.function = rs_timer;
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
for (i = 0; i < NR_IRQS; i++) {
IRQ_ports[i] = 0;
IRQ_timeout[i] = 0;
}
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
/*
* The interrupt of the serial console port
* can't be shared.
*/
if (sercons.flags & CON_CONSDEV) {
for(i = 0; i < NR_PORTS; i++)
if (i != sercons.index &&
rs_table[i].irq == rs_table[sercons.index].irq)
rs_table[i].irq = 0;
}
#endif
show_serial_version();
/* Initialize the tty_driver structure */
memset(&serial_driver, 0, sizeof(struct tty_driver));
serial_driver.magic = TTY_DRIVER_MAGIC;
serial_driver.driver_name = "txx927serial";
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
serial_driver.name = "tts/%d";
#else
serial_driver.name = "ttyS";
#endif
serial_driver.major = TXX927_TTY_MAJOR;
serial_driver.minor_start = TXX927_TTY_MINOR_START + SERIAL_DEV_OFFSET;
serial_driver.num = NR_PORTS;
serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
serial_driver.subtype = SERIAL_TYPE_NORMAL;
serial_driver.init_termios = tty_std_termios;
serial_driver.init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
serial_driver.refcount = &serial_refcount;
serial_driver.table = serial_table;
serial_driver.termios = serial_termios;
serial_driver.termios_locked = serial_termios_locked;
serial_driver.open = rs_open;
serial_driver.close = rs_close;
serial_driver.write = rs_write;
serial_driver.put_char = rs_put_char;
serial_driver.flush_chars = rs_flush_chars;
serial_driver.write_room = rs_write_room;
serial_driver.chars_in_buffer = rs_chars_in_buffer;
serial_driver.flush_buffer = rs_flush_buffer;
serial_driver.ioctl = rs_ioctl;
serial_driver.throttle = rs_throttle;
serial_driver.unthrottle = rs_unthrottle;
serial_driver.send_xchar = rs_send_xchar;
serial_driver.set_termios = rs_set_termios;
serial_driver.stop = rs_stop;
serial_driver.start = rs_start;
serial_driver.hangup = rs_hangup;
serial_driver.break_ctl = rs_break;
serial_driver.wait_until_sent = rs_wait_until_sent;
serial_driver.read_proc = rs_read_proc;
/*
* The callout device is just like normal device except for
* major number and the subtype code.
*/
callout_driver = serial_driver;
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
callout_driver.name = "cua/%d";
#else
callout_driver.name = "cua";
#endif
callout_driver.major = TTYAUX_MAJOR;
callout_driver.subtype = SERIAL_TYPE_CALLOUT;
callout_driver.read_proc = 0;
callout_driver.proc_entry = 0;
if (tty_register_driver(&serial_driver)){
panic("Couldn't register serial driver\n");
}
if (tty_register_driver(&callout_driver)) {
panic("Couldn't register callout driver\n");
}
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
state->magic = SSTATE_MAGIC;
state->line = i;
state->type = PORT_UNKNOWN;
state->custom_divisor = 0;
state->close_delay = 5*HZ/10;
state->closing_wait = 30*HZ;
state->callout_termios = callout_driver.init_termios;
state->normal_termios = serial_driver.init_termios;
state->icount.cts = state->icount.dsr =
state->icount.rng = state->icount.dcd = 0;
state->icount.rx = state->icount.tx = 0;
state->icount.frame = state->icount.parity = 0;
state->icount.overrun = state->icount.brk = 0;
state->irq = irq_cannonicalize(state->irq);
state->xmit_fifo_size = TXx927_SIO_TX_FIFO;
if (state->hub6)
state->io_type = SERIAL_IO_HUB6;
if (state->port) {
continue;
}
}
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
if (state->type == PORT_UNKNOWN) {
continue;
}
printk(KERN_INFO "%s%02d at 0x%04lx (irq = %d) is a %s\n",
TXX927_TTY_NAME,
state->line,
state->port, state->irq,
SERIAL_DRIVER_NAME);
tty_register_devfs(&serial_driver, 0,
serial_driver.minor_start + state->line);
tty_register_devfs(&callout_driver, 0,
callout_driver.minor_start + state->line);
}
return 0;
}
static void __exit rs_fini(void)
{
unsigned long flags;
int e1, e2;
int i;
struct async_struct *info;
del_timer_sync(&serial_timer);
save_flags(flags); cli();
remove_bh(TXX927_SERIAL_BH);
if ((e1 = tty_unregister_driver(&serial_driver)))
printk(KERN_WARNING "serial: failed to unregister serial driver (%d)\n",
e1);
if ((e2 = tty_unregister_driver(&callout_driver)))
printk(KERN_WARNING "serial: failed to unregister callout driver (%d)\n",
e2);
restore_flags(flags);
for (i = 0; i < NR_PORTS; i++) {
if ((info = rs_table[i].info)) {
rs_table[i].info = NULL;
kfree(info);
}
}
if (tmp_buf) {
unsigned long pg = (unsigned long) tmp_buf;
tmp_buf = NULL;
free_page(pg);
}
}
module_init(rs_init);
module_exit(rs_fini);
MODULE_DESCRIPTION("TXX927 serial driver");
/*
* ------------------------------------------------------------
* Serial console driver
* ------------------------------------------------------------
*/
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
static struct async_struct async_sercons;
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*/
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
static struct async_struct *info = &async_sercons;
int ier;
unsigned i;
/*
* First save the IER then disable the interrupts
*/
ier = sio_reg(info)->dicr;
sio_reg(info)->dicr = 0;
/*
* Now, do each character
*/
for (i = 0; i < count; i++, s++) {
wait_for_xmitr(info);
/*
* Send the character out.
* If a LF, also do CR...
*/
sio_reg(info)->tfifo = *s;
if (*s == 10) {
wait_for_xmitr(info);
sio_reg(info)->tfifo = 13;
}
}
/*
* Finally, Wait for transmitter & holding register to empty
* and restore the IER
*/
wait_for_xmitr(info);
sio_reg(info)->dicr = ier;
}
static kdev_t serial_console_device(struct console *c)
{
return MKDEV(TXX927_TTY_MAJOR, TXX927_TTY_MINOR_START + c->index);
}
/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first rs_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int serial_console_setup(struct console *co, char *options)
{
static struct async_struct *info;
struct serial_state *state;
unsigned cval;
int baud = 9600;
int bits = 8;
int parity = 'n';
int cflag = CREAD | HUPCL | CLOCAL;
int quot = 0;
char *s;
if (co->index < 0 || co->index >= NR_PORTS) {
return -1;
}
if (options) {
baud = simple_strtoul(options, NULL, 10);
s = options;
while(*s >= '0' && *s <= '9')
s++;
if (*s) parity = *s++;
if (*s) bits = *s - '0';
}
/*
* Now construct a cflag setting.
*/
switch(baud) {
case 1200:
cflag |= B1200;
break;
case 2400:
cflag |= B2400;
break;
case 4800:
cflag |= B4800;
break;
case 19200:
cflag |= B19200;
break;
case 38400:
cflag |= B38400;
break;
case 57600:
cflag |= B57600;
break;
case 115200:
cflag |= B115200;
break;
case 9600:
default:
cflag |= B9600;
break;
}
switch(bits) {
case 7:
cflag |= CS7;
break;
default:
case 8:
cflag |= CS8;
break;
}
switch(parity) {
case 'o': case 'O':
cflag |= PARODD;
break;
case 'e': case 'E':
cflag |= PARENB;
break;
}
co->cflag = cflag;
/*
* Divisor, bytesize and parity
*/
state = rs_table + co->index;
info = &async_sercons;
info->magic = SERIAL_MAGIC;
info->state = state;
info->port = state->port;
info->flags = state->flags;
info->io_type = state->io_type;
info->iomem_base = state->iomem_base;
info->iomem_reg_shift = state->iomem_reg_shift;
quot = state->baud_base / baud;
switch (cflag & CSIZE) {
case CS7: cval = TXx927_SILCR_UMODE_7BIT; break;
default:
case CS8: cval = TXx927_SILCR_UMODE_8BIT; break;
}
if (cflag & CSTOPB)
cval |= TXx927_SILCR_USBL_2BIT;
else
cval |= TXx927_SILCR_USBL_1BIT;
if (cflag & PARENB)
cval |= TXx927_SILCR_UPEN;
if (!(cflag & PARODD))
cval |= TXx927_SILCR_UEPS;
/*
* Disable UART interrupts, set DTR and RTS high
* and set speed.
*/
sio_reg(info)->dicr = 0;
sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
/* HW RTS/CTS control */
if (info->flags & ASYNC_HAVE_CTS_LINE)
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
/* Enable RX/TX */
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
return 0;
}
static struct console sercons = {
name: TXX927_TTY_NAME,
write: serial_console_write,
device: serial_console_device,
setup: serial_console_setup,
flags: CON_PRINTBUFFER,
index: -1,
};
/*
* Register console.
*/
void __init txx927_console_init(void)
{
register_console(&sercons);
}
#endif