patch-2.4.10 linux/arch/mips/au1000/common/serial.c
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- Lines: 3101
- Date:
Sun Sep 9 10:43:01 2001
- Orig file:
v2.4.9/linux/arch/mips/au1000/common/serial.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/arch/mips/au1000/common/serial.c linux/arch/mips/au1000/common/serial.c
@@ -0,0 +1,3100 @@
+/*
+ *
+ * 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.
+ */
+
+#ifdef MODVERSIONS
+#include <linux/modversions.h>
+#endif
+#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(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 (inl(info->port+offset) & 0xff);
+}
+
+static _INLINE_ void serial_out(struct async_struct *info, int offset, int value)
+{
+ outl(value & 0xff, 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 (inl(UART_MOD_CNTRL + state->port) != 0x3) {
+ outl(3, UART_MOD_CNTRL + state->port);
+ }
+#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;
+ 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 = info->state->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 (inl(UART_MOD_CNTRL + state->port) != 0x3) {
+ outl(3, UART_MOD_CNTRL + state->port);
+ }
+
+ 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\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->baud_base = get_au1000_uart_baud();
+ 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);
+}
+
+/*
+ * Receive character from the serial port
+ */
+static int serial_console_wait_key(struct console *co)
+{
+ static struct async_struct *info;
+ int ier, c;
+
+ info = &async_sercons;
+
+ /*
+ * First save the IER then disable the interrupts so
+ * that the real driver for the port does not get the
+ * character.
+ */
+ ier = serial_in(info, UART_IER);
+ serial_out(info, UART_IER, 0x00);
+
+ while ((serial_in(info, UART_LSR) & UART_LSR_DR) == 0);
+ c = serial_in(info, UART_RX);
+
+ /*
+ * Restore the interrupts
+ */
+ serial_out(info, UART_IER, ier);
+
+ return c;
+}
+
+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();
+ 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,
+ wait_key: serial_console_wait_key,
+ 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)