patch-2.4.22 linux-2.4.22/arch/mips/au1000/common/serial.c
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- Lines: 3073
- Date:
1969-12-31 16:00:00.000000000 -0800
- Orig file:
linux-2.4.21/arch/mips/au1000/common/serial.c
- Orig date:
2002-11-28 15:53:09.000000000 -0800
diff -urN linux-2.4.21/arch/mips/au1000/common/serial.c linux-2.4.22/arch/mips/au1000/common/serial.c
@@ -1,3072 +0,0 @@
-/*
- *
- * BRIEF MODULE DESCRIPTION
- * Au1000 serial port driver.
- *
- * Copyright 2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * ppopov@mvista.com or source@mvista.com
- *
- * Derived almost entirely from drivers/char/serial.c:
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
- * 1998, 1999 Theodore Ts'o
- *
- * 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.
- */
-
-static char *serial_version = "1.01";
-static char *serial_revdate = "2001-02-08";
-
-
-#include <linux/config.h>
-#include <linux/version.h>
-
-#undef SERIAL_PARANOIA_CHECK
-#define CONFIG_SERIAL_NOPAUSE_IO
-#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_AU1000_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/types.h>
-#ifdef LOCAL_HEADERS
-#include "serial_local.h"
-#else
-#include <linux/serial.h>
-#include <linux/serialP.h>
-#include <asm/au1000.h>
-#include <asm/serial.h>
-#define LOCAL_VERSTRING ""
-#endif
-
-#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/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 <asm/uaccess.h>
-#include <linux/delay.h>
-#ifdef CONFIG_AU1000_SERIAL_CONSOLE
-#include <linux/console.h>
-#endif
-#ifdef CONFIG_MAGIC_SYSRQ
-#include <linux/sysrq.h>
-#endif
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/bitops.h>
-
-#ifdef CONFIG_MAC_SERIAL
-#define SERIAL_DEV_OFFSET 2
-#else
-#define SERIAL_DEV_OFFSET 0
-#endif
-
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#else
-#define _INLINE_
-#endif
-
-static char *serial_name = "Serial driver";
-
-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_au1000_uart_baud_base(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_AU1000_SERIAL_CONSOLE
-static struct console sercons;
-static int lsr_break_flag;
-#endif
-#if defined(CONFIG_AU1000_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-static unsigned long break_pressed; /* break, really ... */
-#endif
-
-static void autoconfig(struct serial_state * state);
-static void change_speed(struct async_struct *info, struct termios *old);
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
-
-/*
- * Here we define the default xmit fifo size used for each type of
- * UART
- */
-static struct serial_uart_config uart_config[] = {
- { "unknown", 1, 0 },
- { "8250", 1, 0 },
- { "16450", 1, 0 },
- { "16550", 1, 0 },
- { 0, 0}
-};
-
-
-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))
-
-#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)
-
-static struct tty_struct *serial_table[NR_PORTS];
-static struct termios *serial_termios[NR_PORTS];
-static struct termios *serial_termios_locked[NR_PORTS];
-
-
-#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
-
-/*
- * 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_ unsigned int serial_in(struct async_struct *info, int offset)
-{
- return (au_readl(info->port+offset) & 0xffff);
-}
-
-static _INLINE_ void serial_out(struct async_struct *info, int offset, int value)
-{
- au_writel(value & 0xffff, info->port+offset);
-}
-
-
-/*
- * We used to support using pause I/O for certain machines. We
- * haven't supported this for a while, but just in case it's badly
- * needed for certain old 386 machines, I've left these #define's
- * in....
- */
-#define serial_inp(info, offset) serial_in(info, offset)
-#define serial_outp(info, offset, value) serial_out(info, offset, value)
-
-
-/*
- * ------------------------------------------------------------
- * 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;
- serial_out(info, UART_IER, info->IER);
- }
- 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;
- serial_out(info, UART_IER, info->IER);
- }
- 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(SERIAL_BH);
-}
-
-static _INLINE_ void receive_chars(struct async_struct *info,
- int *status, struct pt_regs * regs)
-{
- struct tty_struct *tty = info->tty;
- unsigned char ch;
- int ignored = 0;
- struct async_icount *icount;
-
- icount = &info->state->icount;
- do {
- ch = serial_inp(info, UART_RX);
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto ignore_char;
- *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 & (UART_LSR_BI | UART_LSR_PE |
- UART_LSR_FE | UART_LSR_OE)) {
- /*
- * For statistics only
- */
- if (*status & UART_LSR_BI) {
- *status &= ~(UART_LSR_FE | UART_LSR_PE);
- 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 defined(CONFIG_AU1000_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
- if (info->line == sercons.index) {
- if (!break_pressed) {
- break_pressed = jiffies;
- goto ignore_char;
- }
- break_pressed = 0;
- }
-#endif
- if (info->flags & ASYNC_SAK)
- do_SAK(tty);
- } else if (*status & UART_LSR_PE)
- icount->parity++;
- else if (*status & UART_LSR_FE)
- icount->frame++;
- if (*status & UART_LSR_OE)
- 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;
-
-#ifdef CONFIG_AU1000_SERIAL_CONSOLE
- if (info->line == sercons.index) {
- /* Recover the break flag from console xmit */
- *status |= lsr_break_flag;
- lsr_break_flag = 0;
- }
-#endif
- if (*status & (UART_LSR_BI)) {
-#ifdef SERIAL_DEBUG_INTR
- printk("handling break....");
-#endif
- *tty->flip.flag_buf_ptr = TTY_BREAK;
- } else if (*status & UART_LSR_PE)
- *tty->flip.flag_buf_ptr = TTY_PARITY;
- else if (*status & UART_LSR_FE)
- *tty->flip.flag_buf_ptr = TTY_FRAME;
- if (*status & UART_LSR_OE) {
- /*
- * Overrun is special, since it's
- * reported immediately, and doesn't
- * affect the current character
- */
- tty->flip.count++;
- tty->flip.flag_buf_ptr++;
- tty->flip.char_buf_ptr++;
- *tty->flip.flag_buf_ptr = TTY_OVERRUN;
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto ignore_char;
- }
- }
-#if defined(CONFIG_AU1000_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
- if (break_pressed && info->line == sercons.index) {
- if (ch != 0 &&
- time_before(jiffies, break_pressed + HZ*5)) {
- handle_sysrq(ch, regs, NULL, NULL);
- break_pressed = 0;
- goto ignore_char;
- }
- break_pressed = 0;
- }
-#endif
- tty->flip.flag_buf_ptr++;
- tty->flip.char_buf_ptr++;
- tty->flip.count++;
- ignore_char:
- *status = serial_inp(info, UART_LSR);
- } while (*status & UART_LSR_DR);
- tty_flip_buffer_push(tty);
-}
-
-static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
-{
- int count;
-
- if (info->x_char) {
- serial_outp(info, UART_TX, 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) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- return;
- }
-
- count = info->xmit_fifo_size;
- do {
- serial_out(info, UART_TX, info->xmit.buf[info->xmit.tail]);
- info->xmit.tail = (info->xmit.tail + 1) & (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) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
-}
-
-static _INLINE_ void check_modem_status(struct async_struct *info)
-{
- int status;
- struct async_icount *icount;
-
- status = serial_in(info, UART_MSR);
-
- if (status & UART_MSR_ANY_DELTA) {
- icount = &info->state->icount;
- /* update input line counters */
- if (status & UART_MSR_TERI)
- icount->rng++;
- if (status & UART_MSR_DDSR)
- icount->dsr++;
- if (status & UART_MSR_DDCD) {
- icount->dcd++;
-#ifdef CONFIG_HARD_PPS
- if ((info->flags & ASYNC_HARDPPS_CD) &&
- (status & UART_MSR_DCD))
- hardpps();
-#endif
- }
- if (status & UART_MSR_DCTS)
- icount->cts++;
- wake_up_interruptible(&info->delta_msr_wait);
- }
-
- if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
-#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
- printk("ttys%d CD now %s...", info->line,
- (status & UART_MSR_DCD) ? "on" : "off");
-#endif
- if (status & UART_MSR_DCD)
- wake_up_interruptible(&info->open_wait);
- else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_CALLOUT_NOHUP))) {
-#ifdef SERIAL_DEBUG_OPEN
- printk("doing serial hangup...");
-#endif
- if (info->tty)
- tty_hangup(info->tty);
- }
- }
- if (info->flags & ASYNC_CTS_FLOW) {
- if (info->tty->hw_stopped) {
- if (status & UART_MSR_CTS) {
-#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
- printk("CTS tx start...");
-#endif
- info->tty->hw_stopped = 0;
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
- return;
- }
- } else {
- if (!(status & UART_MSR_CTS)) {
-#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
- printk("CTS tx stop...");
-#endif
- info->tty->hw_stopped = 1;
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- }
- }
-}
-
-
-
-/*
- * 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 = serial_inp(info, UART_LSR);
-#ifdef SERIAL_DEBUG_INTR
- printk("status = %x...", status);
-#endif
- if (status & UART_LSR_DR)
- receive_chars(info, &status, regs);
- check_modem_status(info);
- if (status & UART_LSR_THRE)
- transmit_chars(info, 0);
- if (pass_counter++ > RS_ISR_PASS_LIMIT) {
-#if 0
- printk("rs_single loop break.\n");
-#endif
- break;
- }
- } while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT));
- 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)) {
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_wakeup)(tty);
- wake_up_interruptible(&tty->write_wait);
-#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 > 3) ? timeout-2 : 1;
-}
-
-
-static int startup(struct async_struct * info)
-{
- unsigned long flags;
- int retval=0;
- void (*handler)(int, void *, struct pt_regs *);
- 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 (!CONFIGURED_SERIAL_PORT(state) || !state->type) {
- 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;
-
-
- if (au_readl(UART_MOD_CNTRL + state->port) != 0x3) {
- au_writel(3, UART_MOD_CNTRL + state->port);
- au_sync_delay(10);
- }
-#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())
- */
- if (uart_config[state->type].flags & UART_CLEAR_FIFO) {
- serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
- serial_outp(info, UART_FCR, 0);
- }
-
- /*
- * Clear the interrupt registers.
- */
- (void) serial_inp(info, UART_LSR);
- (void) serial_inp(info, UART_RX);
- (void) serial_inp(info, UART_IIR);
- (void) serial_inp(info, UART_MSR);
-
- /*
- * At this point there's no way the LSR could still be 0xFF;
- * if it is, then bail out, because there's likely no UART
- * here.
- */
- if (!(info->flags & ASYNC_BUGGY_UART) &&
- (serial_inp(info, UART_LSR) == 0xff)) {
- printk("LSR safety check engaged!\n");
- if (capable(CAP_SYS_ADMIN)) {
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
- } else
- retval = -ENODEV;
- goto errout;
- }
-
- /*
- * Allocate the IRQ if necessary
- */
-#if 0
- /* au1000, uart0 irq is 0 */
- if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) {
-#endif
- if ((!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) {
- if (IRQ_ports[state->irq]) {
- retval = -EBUSY;
- goto errout;
- } else
- handler = rs_interrupt_single;
-
- retval = request_irq(state->irq, handler, SA_SHIRQ,
- "serial", &IRQ_ports[state->irq]);
- 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);
-
- /*
- * Now, initialize the UART
- */
- serial_outp(info, UART_LCR, UART_LCR_WLEN8);
-
- info->MCR = 0;
- if (info->tty->termios->c_cflag & CBAUD)
- info->MCR = UART_MCR_DTR | UART_MCR_RTS;
- {
- if (state->irq != 0)
- info->MCR |= UART_MCR_OUT2;
- }
- info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
- serial_outp(info, UART_MCR, info->MCR);
-
- /*
- * Finally, enable interrupts
- */
- info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
- serial_outp(info, UART_IER, info->IER); /* enable interrupts */
-
-
- /*
- * And clear the interrupt registers again for luck.
- */
- (void)serial_inp(info, UART_LSR);
- (void)serial_inp(info, UART_RX);
- (void)serial_inp(info, UART_IIR);
- (void)serial_inp(info, UART_MSR);
-
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit.head = info->xmit.tail = 0;
-
- /*
- * Set up serial timers...
- */
- mod_timer(&serial_timer, jiffies + 2*HZ/100);
-
- /*
- * 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 */
-
- /*
- * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
- * here so the queue might never be waken up
- */
- wake_up_interruptible(&info->delta_msr_wait);
-
- /*
- * 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] ||
- if ((!IRQ_ports[state->irq] ||
- !IRQ_ports[state->irq]->next_port)) {
- if (IRQ_ports[state->irq]) {
- free_irq(state->irq, &IRQ_ports[state->irq]);
- retval = request_irq(state->irq, rs_interrupt_single,
- SA_SHIRQ, "serial",
- &IRQ_ports[state->irq]);
-
- if (retval)
- printk("serial shutdown: request_irq: error %d"
- " Couldn't reacquire IRQ.\n", retval);
- } else
- free_irq(state->irq, &IRQ_ports[state->irq]);
- }
-
- if (info->xmit.buf) {
- unsigned long pg = (unsigned long) info->xmit.buf;
- info->xmit.buf = 0;
- free_page(pg);
- }
-
- info->IER = 0;
- serial_outp(info, UART_IER, 0x00); /* disable all intrs */
- info->MCR &= ~UART_MCR_OUT2;
- info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
-
- /* disable break condition */
- serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
-
- if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- serial_outp(info, UART_MCR, info->MCR);
-
- /* disable FIFO's */
- serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
- serial_outp(info, UART_FCR, 0);
-
- (void)serial_in(info, UART_RX); /* read data port to reset things */
-
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- info->flags &= ~ASYNC_INITIALIZED;
-#ifndef CONFIG_REMOTE_DEBUG
- au_writel(0, UART_MOD_CNTRL + state->port);
- au_sync_delay(10);
-#endif
- 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, fcr = 0;
- int bits;
- unsigned long flags;
-
- if (!info->tty || !info->tty->termios)
- return;
- cflag = info->tty->termios->c_cflag;
- if (!CONFIGURED_SERIAL_PORT(info))
- return;
-
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5: cval = 0x00; bits = 7; break;
- case CS6: cval = 0x01; bits = 8; break;
- case CS7: cval = 0x02; bits = 9; break;
- case CS8: cval = 0x03; bits = 10; break;
- /* Never happens, but GCC is too dumb to figure it out */
- default: cval = 0x00; bits = 7; break;
- }
- if (cflag & CSTOPB) {
- cval |= 0x04;
- bits++;
- }
- if (cflag & PARENB) {
- cval |= UART_LCR_PARITY;
- bits++;
- }
- if (!(cflag & PARODD))
- cval |= UART_LCR_EPAR;
-#ifdef CMSPAR
- if (cflag & CMSPAR)
- cval |= UART_LCR_SPAR;
-#endif
-
- /* 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 = get_au1000_uart_baud_base();
-
- //if (baud == 38400 &&
- if (((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) {
- quot = info->state->custom_divisor;
- }
- else {
- if (baud == 134)
- /* Special case since 134 is really 134.5 */
- quot = (2*baud_base / 269);
- else if (baud)
- quot = baud_base / 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;
- if (baud == 38400 &&
- ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
- quot = info->state->custom_divisor;
- else {
- if (baud == 134)
- /* Special case since 134 is really 134.5 */
- quot = (2*baud_base / 269);
- else if (baud)
- quot = baud_base / baud;
- }
- }
- /* As a last resort, if the quotient is zero, default to 9600 bps */
- if (!quot)
- quot = baud_base / 9600;
-
- info->quot = quot;
- info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
- info->timeout += HZ/50; /* Add .02 seconds of slop */
-
- /* Set up FIFO's */
- if (uart_config[info->state->type].flags & UART_USE_FIFO) {
- if ((info->state->baud_base / quot) < 2400)
- fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_1;
- else
- fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_8;
- }
-
- /* CTS flow control flag and modem status interrupts */
- info->IER &= ~UART_IER_MSI;
- if (info->flags & ASYNC_HARDPPS_CD)
- info->IER |= UART_IER_MSI;
- if (cflag & CRTSCTS) {
- info->flags |= ASYNC_CTS_FLOW;
- info->IER |= UART_IER_MSI;
- } else
- info->flags &= ~ASYNC_CTS_FLOW;
- if (cflag & CLOCAL)
- info->flags &= ~ASYNC_CHECK_CD;
- else {
- info->flags |= ASYNC_CHECK_CD;
- info->IER |= UART_IER_MSI;
- }
- serial_out(info, UART_IER, info->IER);
-
- /*
- * Set up parity check flag
- */
-#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
-
- info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
- if (I_INPCK(info->tty))
- info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
- info->read_status_mask |= UART_LSR_BI;
-
- /*
- * Characters to ignore
- */
- info->ignore_status_mask = 0;
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
- if (I_IGNBRK(info->tty)) {
- info->ignore_status_mask |= UART_LSR_BI;
- /*
- * If we're ignore parity and break indicators, ignore
- * overruns too. (For real raw support).
- */
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= UART_LSR_OE;
- }
- /*
- * !!! ignore all characters if CREAD is not set
- */
- if ((cflag & CREAD) == 0)
- info->ignore_status_mask |= UART_LSR_DR;
- save_flags(flags); cli();
-
- serial_outp(info, UART_CLK, quot & 0xffff);
- serial_outp(info, UART_LCR, cval);
- info->LCR = cval; /* Save LCR */
- 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 = (info->xmit.head + 1) & (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();
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- 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)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- 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);
- wake_up_interruptible(&tty->write_wait);
-#ifdef SERIAL_HAVE_POLL_WAIT
- wake_up_interruptible(&tty->poll_wait);
-#endif
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_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 */
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
-}
-
-/*
- * ------------------------------------------------------------
- * 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)
- info->MCR &= ~UART_MCR_RTS;
-
- save_flags(flags); cli();
- serial_out(info, UART_MCR, info->MCR);
- 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)
- info->MCR |= UART_MCR_RTS;
- save_flags(flags); cli();
- serial_out(info, UART_MCR, info->MCR);
- restore_flags(flags);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_ioctl() and friends
- * ------------------------------------------------------------
- */
-
-static int get_serial_info(struct async_struct * info,
- struct serial_struct * retinfo)
-{
- struct serial_struct tmp;
- struct serial_state *state = info->state;
-
- if (!retinfo)
- return -EFAULT;
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = state->type;
- tmp.line = state->line;
- tmp.port = state->port;
- if (HIGH_BITS_OFFSET)
- tmp.port_high = state->port >> HIGH_BITS_OFFSET;
- else
- tmp.port_high = 0;
- tmp.irq = state->irq;
- tmp.flags = state->flags;
- tmp.xmit_fifo_size = state->xmit_fifo_size;
- tmp.baud_base = state->baud_base;
- tmp.close_delay = state->close_delay;
- tmp.closing_wait = state->closing_wait;
- tmp.custom_divisor = state->custom_divisor;
- tmp.hub6 = state->hub6;
- tmp.io_type = state->io_type;
- if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int set_serial_info(struct async_struct * info,
- struct serial_struct * new_info)
-{
- struct serial_struct new_serial;
- struct serial_state old_state, *state;
- unsigned int i,change_irq,change_port;
- int retval = 0;
- unsigned long new_port;
-
- if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
- return -EFAULT;
- state = info->state;
- old_state = *state;
-
- new_port = new_serial.port;
- if (HIGH_BITS_OFFSET)
- new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
-
- change_irq = new_serial.irq != state->irq;
- change_port = (new_port != ((int) state->port)) ||
- (new_serial.hub6 != state->hub6);
-
- if (!capable(CAP_SYS_ADMIN)) {
- if (change_irq || change_port ||
- (new_serial.baud_base != state->baud_base) ||
- (new_serial.type != state->type) ||
- (new_serial.close_delay != state->close_delay) ||
- (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
- ((new_serial.flags & ~ASYNC_USR_MASK) !=
- (state->flags & ~ASYNC_USR_MASK)))
- return -EPERM;
- state->flags = ((state->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- info->flags = ((info->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- state->custom_divisor = new_serial.custom_divisor;
- goto check_and_exit;
- }
-
- new_serial.irq = irq_cannonicalize(new_serial.irq);
-
- if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
- (new_serial.baud_base < 9600)|| (new_serial.type < PORT_UNKNOWN) ||
- (new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) ||
- (new_serial.type == PORT_STARTECH)) {
- return -EINVAL;
- }
-
- if ((new_serial.type != state->type) ||
- (new_serial.xmit_fifo_size <= 0))
- new_serial.xmit_fifo_size =
- uart_config[new_serial.type].dfl_xmit_fifo_size;
-
- /* Make sure address is not already in use */
- if (new_serial.type) {
- for (i = 0 ; i < NR_PORTS; i++)
- if ((state != &rs_table[i]) &&
- (rs_table[i].port == new_port) &&
- rs_table[i].type)
- return -EADDRINUSE;
- }
-
- if ((change_port || change_irq) && (state->count > 1))
- return -EBUSY;
-
- /*
- * OK, past this point, all the error checking has been done.
- * At this point, we start making changes.....
- */
-
- state->baud_base = new_serial.baud_base;
- state->flags = ((state->flags & ~ASYNC_FLAGS) |
- (new_serial.flags & ASYNC_FLAGS));
- info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
- (info->flags & ASYNC_INTERNAL_FLAGS));
- state->custom_divisor = new_serial.custom_divisor;
- state->close_delay = new_serial.close_delay * HZ/100;
- state->closing_wait = new_serial.closing_wait * HZ/100;
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
- info->xmit_fifo_size = state->xmit_fifo_size =
- new_serial.xmit_fifo_size;
-
- if ((state->type != PORT_UNKNOWN) && state->port) {
- release_region(state->port,8);
- }
- state->type = new_serial.type;
- if (change_port || change_irq) {
- /*
- * We need to shutdown the serial port at the old
- * port/irq combination.
- */
- shutdown(info);
- state->irq = new_serial.irq;
- info->port = state->port = new_port;
- info->hub6 = state->hub6 = new_serial.hub6;
- if (info->hub6)
- info->io_type = state->io_type = SERIAL_IO_HUB6;
- else if (info->io_type == SERIAL_IO_HUB6)
- info->io_type = state->io_type = SERIAL_IO_PORT;
- }
- if ((state->type != PORT_UNKNOWN) && state->port) {
- request_region(state->port,8,"serial(set)");
- }
-
-
-check_and_exit:
- if (!state->port || !state->type)
- return 0;
- if (info->flags & ASYNC_INITIALIZED) {
- if (((old_state.flags & ASYNC_SPD_MASK) !=
- (state->flags & ASYNC_SPD_MASK)) ||
- (old_state.custom_divisor != state->custom_divisor)) {
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- info->tty->alt_speed = 57600;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- info->tty->alt_speed = 115200;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- info->tty->alt_speed = 230400;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- info->tty->alt_speed = 460800;
- change_speed(info, 0);
- }
- } else {
- retval = startup(info);
- }
- return retval;
-}
-
-
-/*
- * get_lsr_info - get line status register info
- *
- * Purpose: Let user call ioctl() to get info when the UART physically
- * is emptied. On bus types like RS485, the transmitter must
- * release the bus after transmitting. This must be done when
- * the transmit shift register is empty, not be done when the
- * transmit holding register is empty. This functionality
- * allows an RS485 driver to be written in user space.
- */
-static int get_lsr_info(struct async_struct * info, unsigned int *value)
-{
- unsigned char status;
- unsigned int result;
- unsigned long flags;
-
- save_flags(flags); cli();
- status = serial_in(info, UART_LSR);
- restore_flags(flags);
- result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
-
- /*
- * If we're about to load something into the transmit
- * register, we'll pretend the transmitter isn't empty to
- * avoid a race condition (depending on when the transmit
- * interrupt happens).
- */
- if (info->x_char ||
- ((CIRC_CNT(info->xmit.head, info->xmit.tail,
- SERIAL_XMIT_SIZE) > 0) &&
- !info->tty->stopped && !info->tty->hw_stopped))
- result &= TIOCSER_TEMT;
-
- if (copy_to_user(value, &result, sizeof(int)))
- return -EFAULT;
- return 0;
-}
-
-
-static int get_modem_info(struct async_struct * info, unsigned int *value)
-{
- unsigned char control, status;
- unsigned int result;
- unsigned long flags;
-
- control = info->MCR;
- save_flags(flags); cli();
- status = serial_in(info, UART_MSR);
- restore_flags(flags);
- result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
- | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
-#ifdef TIOCM_OUT1
- | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
- | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
-#endif
- | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
- | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
- | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
- | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
-
- if (copy_to_user(value, &result, sizeof(int)))
- return -EFAULT;
- return 0;
-}
-
-static int set_modem_info(struct async_struct * info, unsigned int cmd,
- unsigned int *value)
-{
- unsigned int arg;
- unsigned long flags;
-
- if (copy_from_user(&arg, value, sizeof(int)))
- return -EFAULT;
-
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS)
- info->MCR |= UART_MCR_RTS;
- if (arg & TIOCM_DTR)
- info->MCR |= UART_MCR_DTR;
-#ifdef TIOCM_OUT1
- if (arg & TIOCM_OUT1)
- info->MCR |= UART_MCR_OUT1;
- if (arg & TIOCM_OUT2)
- info->MCR |= UART_MCR_OUT2;
-#endif
- if (arg & TIOCM_LOOP)
- info->MCR |= UART_MCR_LOOP;
- break;
- case TIOCMBIC:
- if (arg & TIOCM_RTS)
- info->MCR &= ~UART_MCR_RTS;
- if (arg & TIOCM_DTR)
- info->MCR &= ~UART_MCR_DTR;
-#ifdef TIOCM_OUT1
- if (arg & TIOCM_OUT1)
- info->MCR &= ~UART_MCR_OUT1;
- if (arg & TIOCM_OUT2)
- info->MCR &= ~UART_MCR_OUT2;
-#endif
- if (arg & TIOCM_LOOP)
- info->MCR &= ~UART_MCR_LOOP;
- break;
- case TIOCMSET:
- info->MCR = ((info->MCR & ~(UART_MCR_RTS |
-#ifdef TIOCM_OUT1
- UART_MCR_OUT1 |
- UART_MCR_OUT2 |
-#endif
- UART_MCR_LOOP |
- UART_MCR_DTR))
- | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
-#ifdef TIOCM_OUT1
- | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
- | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
-#endif
- | ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0)
- | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
- break;
- default:
- return -EINVAL;
- }
- save_flags(flags); cli();
- info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
- serial_out(info, UART_MCR, info->MCR);
- restore_flags(flags);
- return 0;
-}
-
-static int do_autoconfig(struct async_struct * info)
-{
- int retval;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (info->state->count > 1)
- return -EBUSY;
-
- shutdown(info);
-
- autoconfig(info->state);
- retval = startup(info);
- if (retval)
- return retval;
- return 0;
-}
-
-/*
- * 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 (!CONFIGURED_SERIAL_PORT(info))
- return;
- save_flags(flags); cli();
- if (break_state == -1)
- info->LCR |= UART_LCR_SBC;
- else
- info->LCR &= ~UART_LCR_SBC;
- serial_out(info, UART_LCR, info->LCR);
- 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;
- struct async_icount cprev, cnow; /* kernel counter temps */
- struct serial_icounter_struct icount;
- unsigned long flags;
-
- 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);
- case TIOCGSERIAL:
- return get_serial_info(info,
- (struct serial_struct *) arg);
- case TIOCSSERIAL:
- return set_serial_info(info,
- (struct serial_struct *) arg);
- case TIOCSERCONFIG:
- return do_autoconfig(info);
-
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, (unsigned int *) arg);
-
- case TIOCSERGSTRUCT:
- if (copy_to_user((struct async_struct *) arg,
- info, sizeof(struct async_struct)))
- return -EFAULT;
- 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:
- save_flags(flags); cli();
- /* note the counters on entry */
- cprev = info->state->icount;
- restore_flags(flags);
- /* Force modem status interrupts on */
- info->IER |= UART_IER_MSI;
- serial_out(info, UART_IER, info->IER);
- while (1) {
- interruptible_sleep_on(&info->delta_msr_wait);
- /* see if a signal did it */
- if (signal_pending(current))
- return -ERESTARTSYS;
- save_flags(flags); cli();
- cnow = info->state->icount; /* atomic copy */
- restore_flags(flags);
- if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
- cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
- return -EIO; /* no change => error */
- if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
- ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
- ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
- ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
- return 0;
- }
- cprev = cnow;
- }
- /* NOTREACHED */
-
- /*
- * 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:
- save_flags(flags); cli();
- cnow = info->state->icount;
- restore_flags(flags);
- icount.cts = cnow.cts;
- icount.dsr = cnow.dsr;
- icount.rng = cnow.rng;
- icount.dcd = cnow.dcd;
- icount.rx = cnow.rx;
- icount.tx = cnow.tx;
- icount.frame = cnow.frame;
- icount.overrun = cnow.overrun;
- icount.parity = cnow.parity;
- icount.brk = cnow.brk;
- icount.buf_overrun = cnow.buf_overrun;
-
- if (copy_to_user((void *)arg, &icount, sizeof(icount)))
- return -EFAULT;
- 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)) {
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- save_flags(flags); cli();
- serial_out(info, UART_MCR, info->MCR);
- restore_flags(flags);
- }
-
- /* Handle transition away from B0 status */
- if (!(old_termios->c_cflag & CBAUD) &&
- (cflag & CBAUD)) {
- info->MCR |= UART_MCR_DTR;
- if (!(tty->termios->c_cflag & CRTSCTS) ||
- !test_bit(TTY_THROTTLED, &tty->flags)) {
- info->MCR |= UART_MCR_RTS;
- }
- save_flags(flags); cli();
- serial_out(info, UART_MCR, info->MCR);
- 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)) {
- DBG_CNT("before DEC-hung");
- MOD_DEC_USE_COUNT;
- 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("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("rs_close: bad serial port count for ttys%d: %d\n",
- info->line, state->count);
- state->count = 0;
- }
- if (state->count) {
- DBG_CNT("before DEC-2");
- MOD_DEC_USE_COUNT;
- restore_flags(flags);
- return;
- }
- info->flags |= ASYNC_CLOSING;
- restore_flags(flags);
- /*
- * 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 (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, info->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->IER &= ~UART_IER_RLSI;
- info->read_status_mask &= ~UART_LSR_DR;
- if (info->flags & ASYNC_INITIALIZED) {
- serial_out(info, UART_IER, info->IER);
- /*
- * 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);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- tty->closing = 0;
- info->event = 0;
- info->tty = 0;
- if (info->blocked_open) {
- if (info->close_delay) {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(info->close_delay);
- }
- wake_up_interruptible(&info->open_wait);
- }
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
- ASYNC_CLOSING);
- wake_up_interruptible(&info->close_wait);
- MOD_DEC_USE_COUNT;
-}
-
-/*
- * 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 lsr;
-
- if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
- return;
-
- if (info->state->type == PORT_UNKNOWN)
- 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 && timeout < char_time)
- 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 (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) {
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
-#endif
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(char_time);
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- break;
- }
- set_current_state(TASK_RUNNING);
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- printk("lsr = %d (jiff=%lu)...done\n", lsr, 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);
- if (info->flags & ASYNC_CLOSING)
- return;
- 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))
- serial_out(info, UART_MCR,
- serial_inp(info, UART_MCR) |
- (UART_MCR_DTR | UART_MCR_RTS));
- restore_flags(flags);
- set_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) &&
- (do_clocal || (serial_in(info, UART_MSR) &
- UART_MSR_DCD)))
- 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();
- }
- set_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;
-
- 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->iomem_base = sstate->iomem_base;
- info->iomem_reg_shift = sstate->iomem_reg_shift;
- 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;
-
- MOD_INC_USE_COUNT;
- line = MINOR(tty->device) - tty->driver.minor_start;
- if ((line < 0) || (line >= NR_PORTS)) {
- MOD_DEC_USE_COUNT;
- return -ENODEV;
- }
- retval = get_async_struct(line, &info);
- if (retval) {
- MOD_DEC_USE_COUNT;
- return retval;
- }
- tty->driver_data = info;
- info->tty = tty;
- if (serial_paranoia_check(info, tty->device, "rs_open")) {
- MOD_DEC_USE_COUNT;
- return -ENODEV;
- }
-
-#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_zeroed_page(GFP_KERNEL);
- if (!page) {
- MOD_DEC_USE_COUNT;
- 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);
- MOD_DEC_USE_COUNT;
-#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) {
- MOD_DEC_USE_COUNT;
- 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
- MOD_DEC_USE_COUNT;
- 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_AU1000_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], control, status;
- int ret;
- unsigned long flags;
-
- ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
- state->line, uart_config[state->type].name,
- state->port, state->irq);
-
- if (!state->port || (state->type == PORT_UNKNOWN)) {
- 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;
- }
- save_flags(flags); cli();
- status = serial_in(info, UART_MSR);
- control = info != &scr_info ? info->MCR : serial_in(info, UART_MCR);
- restore_flags(flags);
-
- stat_buf[0] = 0;
- stat_buf[1] = 0;
- if (control & UART_MCR_RTS)
- strcat(stat_buf, "|RTS");
- if (status & UART_MSR_CTS)
- strcat(stat_buf, "|CTS");
- if (control & UART_MCR_DTR)
- strcat(stat_buf, "|DTR");
- if (status & UART_MSR_DSR)
- strcat(stat_buf, "|DSR");
- if (status & UART_MSR_DCD)
- strcat(stat_buf, "|CD");
- if (status & UART_MSR_RI)
- strcat(stat_buf, "|RI");
-
- 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;
-}
-
-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%s revision:%s\n",
- serial_version, LOCAL_VERSTRING, serial_revdate);
- 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 + (off-begin);
- 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 char serial_options[] __initdata =
- " no serial options enabled\n";
-#undef SERIAL_OPT
-
-static _INLINE_ void show_serial_version(void)
-{
- printk(KERN_INFO "%s version %s%s (%s) with%s", serial_name,
- serial_version, LOCAL_VERSTRING, serial_revdate,
- serial_options);
-}
-
-
-/*
- * This routine is called by rs_init() to initialize a specific serial
- * port. It determines what type of UART chip this serial port is
- * using: 8250, 16450, 16550, 16550A. The important question is
- * whether or not this UART is a 16550A or not, since this will
- * determine whether or not we can use its FIFO features or not.
- */
-static void autoconfig(struct serial_state * state)
-{
- struct async_struct *info, scr_info;
- unsigned long flags;
-
-
-#ifdef SERIAL_DEBUG_AUTOCONF
- printk("Testing ttyS%d (0x%04lx, 0x%04x)...\n", state->line,
- state->port, (unsigned) state->iomem_base);
-#endif
-
- if (!CONFIGURED_SERIAL_PORT(state))
- return;
-
- if (au_readl(UART_MOD_CNTRL + state->port) != 0x3) {
- au_writel(3, UART_MOD_CNTRL + state->port);
- au_sync_delay(10);
- }
-
- state->type = PORT_16550;
- info = &scr_info; /* This is just for serial_{in,out} */
-
- 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;
-
-
- save_flags(flags); cli();
- state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
-
- if (info->port) {
- request_region(info->port,8,"serial(auto)");
- }
-
- /*
- * Reset the UART.
- */
- serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
- serial_outp(info, UART_FCR, 0);
- (void)serial_in(info, UART_RX);
- serial_outp(info, UART_IER, 0);
- restore_flags(flags);
-}
-
-int register_serial(struct serial_struct *req);
-void unregister_serial(int line);
-
-EXPORT_SYMBOL(register_serial);
-EXPORT_SYMBOL(unregister_serial);
-
-
-/*
- * The serial driver boot-time initialization code!
- */
-static int __init rs_init(void)
-{
- int i;
- struct serial_state * state;
-
- init_bh(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_AU1000_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 = "serial";
-#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
- serial_driver.name = "tts/%d";
-#else
- serial_driver.name = "ttyS";
-#endif
- serial_driver.major = TTY_MAJOR;
- serial_driver.minor_start = 64 + 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.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.send_xchar = rs_send_xchar;
- 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");
- if (tty_register_driver(&callout_driver))
- panic("Couldn't register callout driver");
-
- for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
- state->baud_base = get_au1000_uart_baud_base();
- 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);
- if (state->hub6)
- state->io_type = SERIAL_IO_HUB6;
- if (state->port && check_region(state->port,8)) {
- continue;
- }
-
- if (state->flags & ASYNC_BOOT_AUTOCONF) {
- autoconfig(state);
- }
- }
- for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
- if (state->type == PORT_UNKNOWN) {
- continue;
- }
- printk(KERN_INFO "ttyS%02d%s at 0x%04lx (irq = %d) is a %s\n",
- state->line + SERIAL_DEV_OFFSET,
- (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
- state->port, state->irq,
- uart_config[state->type].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;
-}
-
-/*
- * register_serial and unregister_serial allows for 16x50 serial ports to be
- * configured at run-time, to support PCMCIA modems.
- */
-
-/**
- * register_serial - configure a 16x50 serial port at runtime
- * @req: request structure
- *
- * Configure the serial port specified by the request. If the
- * port exists and is in use an error is returned. If the port
- * is not currently in the table it is added.
- *
- * The port is then probed and if neccessary 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.
- */
-
-int register_serial(struct serial_struct *req)
-{
- int i;
- unsigned long flags;
- struct serial_state *state;
- struct async_struct *info;
- unsigned long port;
-
- port = req->port;
- if (HIGH_BITS_OFFSET)
- port += (unsigned long) req->port_high << HIGH_BITS_OFFSET;
-
- save_flags(flags); cli();
- for (i = 0; i < NR_PORTS; i++) {
- if ((rs_table[i].port == port) &&
- (rs_table[i].iomem_base == req->iomem_base))
- break;
- }
- if (i == NR_PORTS) {
- for (i = 0; i < NR_PORTS; i++)
- if ((rs_table[i].type == PORT_UNKNOWN) &&
- (rs_table[i].count == 0))
- break;
- }
- if (i == NR_PORTS) {
- restore_flags(flags);
- return -1;
- }
- state = &rs_table[i];
- if (rs_table[i].count) {
- restore_flags(flags);
- printk("Couldn't configure serial #%d (port=%ld,irq=%d): "
- "device already open\n", i, port, req->irq);
- return -1;
- }
- state->irq = req->irq;
- state->port = port;
- state->flags = req->flags;
- state->io_type = req->io_type;
- state->iomem_base = req->iomem_base;
- state->iomem_reg_shift = req->iomem_reg_shift;
- if (req->baud_base)
- state->baud_base = req->baud_base;
- if ((info = state->info) != NULL) {
- info->port = port;
- info->flags = req->flags;
- info->io_type = req->io_type;
- info->iomem_base = req->iomem_base;
- info->iomem_reg_shift = req->iomem_reg_shift;
- }
- autoconfig(state);
- if (state->type == PORT_UNKNOWN) {
- restore_flags(flags);
- printk("register_serial(): autoconfig failed\n");
- return -1;
- }
- restore_flags(flags);
-
- printk(KERN_INFO "ttyS%02d at %s 0x%04lx (irq = %d) is a %s\n",
- state->line + SERIAL_DEV_OFFSET,
- state->iomem_base ? "iomem" : "port",
- state->iomem_base ? (unsigned long)state->iomem_base :
- state->port, state->irq, uart_config[state->type].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 state->line + SERIAL_DEV_OFFSET;
-}
-
-/**
- * unregister_serial - deconfigure a 16x50 serial port
- * @line: line to deconfigure
- *
- * The port specified is deconfigured and its resources are freed. Any
- * user of the port is disconnected as if carrier was dropped. Line is
- * the port number returned by register_serial().
- */
-
-void unregister_serial(int line)
-{
- unsigned long flags;
- struct serial_state *state = &rs_table[line];
-
- save_flags(flags); cli();
- if (state->info && state->info->tty)
- tty_hangup(state->info->tty);
- state->type = PORT_UNKNOWN;
- printk(KERN_INFO "tty%02d unloaded\n", state->line);
- /* These will be hidden, because they are devices that will no longer
- * be available to the system. (ie, PCMCIA modems, once ejected)
- */
- tty_unregister_devfs(&serial_driver,
- serial_driver.minor_start + state->line);
- tty_unregister_devfs(&callout_driver,
- callout_driver.minor_start + state->line);
- restore_flags(flags);
-}
-
-static void __exit rs_fini(void)
-{
- unsigned long flags;
- int e1, e2;
- int i;
- struct async_struct *info;
-
- /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
- del_timer_sync(&serial_timer);
- save_flags(flags); cli();
- remove_bh(SERIAL_BH);
- if ((e1 = tty_unregister_driver(&serial_driver)))
- printk("serial: failed to unregister serial driver (%d)\n",
- e1);
- if ((e2 = tty_unregister_driver(&callout_driver)))
- printk("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 ((rs_table[i].type != PORT_UNKNOWN) && rs_table[i].port) {
- release_region(rs_table[i].port, 8);
- }
- }
- 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("Au1000 serial driver");
-
-
-/*
- * ------------------------------------------------------------
- * Serial console driver
- * ------------------------------------------------------------
- */
-#ifdef CONFIG_AU1000_SERIAL_CONSOLE
-
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-static struct async_struct async_sercons;
-
-/*
- * Wait for transmitter & holding register to empty
- */
-static inline void wait_for_xmitr(struct async_struct *info)
-{
- unsigned int status, tmout = 0xffffff;
-
- do {
- status = serial_in(info, UART_LSR);
-
- if (status & UART_LSR_BI)
- lsr_break_flag = UART_LSR_BI;
-
- if (--tmout == 0)
- break;
- } while((status & BOTH_EMPTY) != BOTH_EMPTY);
-}
-
-
-/*
- * 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_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 = serial_in(info, UART_IER);
- serial_out(info, UART_IER, 0x00);
-
- /*
- * 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...
- */
- serial_out(info, UART_TX, *s);
- if (*s == 10) {
- wait_for_xmitr(info);
- serial_out(info, UART_TX, 13);
- }
- }
-
- /*
- * Finally, Wait for transmitter & holding register to empty
- * and restore the IER
- */
- wait_for_xmitr(info);
- serial_out(info, UART_IER, ier);
-}
-
-static kdev_t serial_console_device(struct console *c)
-{
- return MKDEV(TTY_MAJOR, 64 + 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 __init 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 (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;
- state->baud_base = get_au1000_uart_baud_base();
- quot = state->baud_base / baud;
-
- cval = cflag & (CSIZE | CSTOPB);
- cval >>= 4;
- if (cflag & PARENB)
- cval |= UART_LCR_PARITY;
- if (!(cflag & PARODD))
- cval |= UART_LCR_EPAR;
-
- /*
- * Disable UART interrupts, set DTR and RTS high
- * and set speed.
- */
- serial_out(info, UART_CLK, quot & 0xffff);
- serial_out(info, UART_IER, 0);
- serial_out(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
-
- /*
- * If we read 0xff from the LSR, there is no UART here.
- */
- if (serial_in(info, UART_LSR) == 0xff)
- return -1;
-
- return 0;
-}
-
-static struct console sercons = {
- name: "ttyS",
- write: serial_console_write,
- device: serial_console_device,
- setup: serial_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
-};
-
-/*
- * Register console.
- */
-void __init au1000_serial_console_init(void)
-{
- register_console(&sercons);
-}
-#endif
-
-/*
- Local variables:
- compile-command: "gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe -fno-strength-reduce -march=i586 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h -DEXPORT_SYMTAB -c serial.c"
- End:
-*/
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)