patch-2.4.19 linux-2.4.19/drivers/char/serial_txx927.c
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- Lines: 2330
- Date:
Fri Aug 2 17:39:43 2002
- Orig file:
linux-2.4.18/drivers/char/serial_txx927.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.18/drivers/char/serial_txx927.c linux-2.4.19/drivers/char/serial_txx927.c
@@ -0,0 +1,2329 @@
+/*
+ * drivers/char/serial_txx927.c
+ * driver for TX[34]927 SIO
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ * ahennessy@mvista.com
+ *
+ * Based on drivers/char/serial.c
+ *
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define SERIAL_DO_RESTART
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+#undef SERIAL_DEBUG_PCI
+#undef SERIAL_DEBUG_AUTOCONF
+
+#ifdef MODULE
+#undef CONFIG_TXX927_SERIAL_CONSOLE
+#endif
+
+#define CONFIG_SERIAL_RSA
+
+#define RS_STROBE_TIME (10*HZ)
+#define RS_ISR_PASS_LIMIT 256
+
+/*
+ * End of serial driver configuration section.
+ */
+
+#include <linux/module.h>
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/circ_buf.h>
+#include <linux/serial_reg.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/serialP.h>
+#include <linux/delay.h>
+#ifdef CONFIG_TXX927_SERIAL_CONSOLE
+#include <linux/console.h>
+#endif
+#ifdef CONFIG_MAGIC_SYSRQ
+#include <linux/sysrq.h>
+#endif
+
+#include <asm/system.h>
+#include <asm/serial.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/bitops.h>
+#include <asm/jmr3927/txx927.h>
+#include <asm/bootinfo.h>
+#ifdef CONFIG_TOSHIBA_JMR3927
+#include <asm/jmr3927/jmr3927.h>
+#endif
+
+#define _INLINE_ inline
+
+#ifdef CONFIG_MAC_SERIAL
+#define SERIAL_DEV_OFFSET 2
+#else
+#define SERIAL_DEV_OFFSET 0
+#endif
+
+static char *serial_name = "TXx927 Serial driver";
+static char *serial_version = "0.02";
+
+static DECLARE_TASK_QUEUE(tq_serial);
+
+static struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+static struct timer_list serial_timer;
+
+extern unsigned long get_txx927_uart_baud(void);
+
+/* serial subtype definitions */
+#ifndef SERIAL_TYPE_NORMAL
+#define SERIAL_TYPE_NORMAL 1
+#define SERIAL_TYPE_CALLOUT 2
+#endif
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/*
+ * IRQ_timeout - How long the timeout should be for each IRQ
+ * should be after the IRQ has been active.
+ */
+
+static struct async_struct *IRQ_ports[NR_IRQS];
+static int IRQ_timeout[NR_IRQS];
+#ifdef CONFIG_TXX927_SERIAL_CONSOLE
+static struct console sercons;
+#endif
+#if defined(CONFIG_TXX927_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+static unsigned long break_pressed; /* break, really ... */
+#endif
+
+static void change_speed(struct async_struct *info, struct termios *old);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+#ifndef PREPARE_FUNC
+#define PREPARE_FUNC(dev) (dev->prepare)
+#define ACTIVATE_FUNC(dev) (dev->activate)
+#define DEACTIVATE_FUNC(dev) (dev->deactivate)
+#endif
+
+#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
+
+
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
+ kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+#define SERIAL_DRIVER_NAME "TXx927SIO"
+
+#ifdef CONFIG_SERIAL
+/* "ttyS","cua" is used for standard serial driver */
+#define TXX927_TTY_NAME "ttySC"
+#define TXX927_TTY_MINOR_START (64 + 16) /* ttySC0(80), ttySC1(81) */
+#define TXX927_CU_NAME "cuac"
+#define TXX927_SERIAL_BH TXX927SERIAL_BH
+#else
+/* acts like standard serial driver */
+#define TXX927_TTY_NAME "ttyS"
+#define TXX927_TTY_MINOR_START 64
+#define TXX927_CU_NAME "cua"
+#define TXX927_SERIAL_BH SERIAL_BH
+#endif
+#define TXX927_TTY_MAJOR TTY_MAJOR
+#define TXX927_TTYAUX_MAJOR TTYAUX_MAJOR
+
+#define ASYNC_HAVE_CTS_LINE ASYNC_BOOT_AUTOCONF /* reuse */
+
+static struct serial_state rs_table[RS_TABLE_SIZE] = {
+ SERIAL_PORT_DFNS /* Defined in serial.h */
+};
+
+#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
+
+static struct tty_struct *serial_table[NR_PORTS];
+static struct termios *serial_termios[NR_PORTS];
+static struct termios *serial_termios_locked[NR_PORTS];
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write. We need to
+ * lock it in case the copy_from_user blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char *tmp_buf;
+#ifdef DECLARE_MUTEX
+static DECLARE_MUTEX(tmp_buf_sem);
+#else
+static struct semaphore tmp_buf_sem = MUTEX;
+#endif
+
+static inline int serial_paranoia_check(struct async_struct *info,
+ kdev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char *badmagic =
+ "Warning: bad magic number for serial struct (%s) in %s\n";
+ static const char *badinfo =
+ "Warning: null async_struct for (%s) in %s\n";
+
+ if (!info) {
+ printk(badinfo, kdevname(device), routine);
+ return 1;
+ }
+ if (info->magic != SERIAL_MAGIC) {
+ printk(badmagic, kdevname(device), routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+static inline struct txx927_sio_reg *sio_reg(struct async_struct *info)
+{
+ return (struct txx927_sio_reg *)info->port;
+}
+
+/*
+ * Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct async_struct *info)
+{
+ unsigned int tmout = 1000000;
+
+ do {
+ if (--tmout == 0) break;
+ } while (!(sio_reg(info)->cisr & TXx927_SICISR_TXALS));
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_stop(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_stop"))
+ return;
+
+ save_flags(flags); cli();
+ if (info->IER & UART_IER_THRI) {
+ info->IER &= ~UART_IER_THRI;
+ sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
+ }
+ restore_flags(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_start"))
+ return;
+
+ save_flags(flags); cli();
+ if (info->xmit.head != info->xmit.tail
+ && info->xmit.buf
+ && !(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
+ }
+ restore_flags(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static _INLINE_ void rs_sched_event(struct async_struct *info,
+ int event)
+{
+ info->event |= 1 << event;
+ queue_task(&info->tqueue, &tq_serial);
+ mark_bh(TXX927_SERIAL_BH);
+}
+
+static _INLINE_ void receive_chars(struct async_struct *info,
+ int *status)
+{
+ struct tty_struct *tty = info->tty;
+ unsigned char ch;
+ int ignored = 0;
+ struct async_icount *icount;
+
+ icount = &info->state->icount;
+ do {
+ ch = sio_reg(info)->rfifo;
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ break;
+ *tty->flip.char_buf_ptr = ch;
+ icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("DR%02x:%02x...", ch, *status);
+#endif
+ *tty->flip.flag_buf_ptr = 0;
+ if (*status & (TXx927_SIDISR_UBRK | TXx927_SIDISR_UPER |
+ TXx927_SIDISR_UFER | TXx927_SIDISR_UOER)) {
+ /*
+ * For statistics only
+ */
+ if (*status & TXx927_SIDISR_UBRK) {
+ *status &= ~(TXx927_SIDISR_UFER | TXx927_SIDISR_UPER);
+ icount->brk++;
+ } else if (*status & TXx927_SIDISR_UPER)
+ icount->parity++;
+ else if (*status & TXx927_SIDISR_UFER)
+ icount->frame++;
+ if (*status & TXx927_SIDISR_UOER)
+ icount->overrun++;
+
+ /*
+ * Now check to see if character should be
+ * ignored, and mask off conditions which
+ * should be ignored.
+ */
+ if (*status & info->ignore_status_mask) {
+ if (++ignored > 100)
+ break;
+ goto ignore_char;
+ }
+ *status &= info->read_status_mask;
+
+ if (*status & (TXx927_SIDISR_UBRK)) {
+#ifdef SERIAL_DEBUG_INTR
+ printk("handling break....");
+#endif
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ if (info->flags & ASYNC_SAK)
+ do_SAK(tty);
+ } else if (*status & TXx927_SIDISR_UPER)
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ else if (*status & TXx927_SIDISR_UFER)
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ if (*status & TXx927_SIDISR_UOER) {
+ /*
+ * Overrun is special, since it's
+ * reported immediately, and doesn't
+ * affect the current character
+ */
+ if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+ tty->flip.count++;
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ }
+ }
+ }
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ ignore_char:
+ *status = sio_reg(info)->disr;
+ } while (!(*status & TXx927_SIDISR_UVALID));
+
+ tty_flip_buffer_push(tty);
+}
+
+static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
+{
+ int count;
+
+ wait_for_xmitr(info);
+
+ if (info->x_char) {
+ sio_reg(info)->tfifo = info->x_char;
+ info->state->icount.tx++;
+ info->x_char = 0;
+ if (intr_done)
+ *intr_done = 0;
+ return;
+ }
+
+ if (info->xmit.head == info->xmit.tail
+ || info->tty->stopped
+ || info->tty->hw_stopped) {
+ sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
+ return;
+ }
+
+ count = info->xmit_fifo_size;
+ do {
+ sio_reg(info)->tfifo = info->xmit.buf[info->xmit.tail++];
+ info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
+ info->state->icount.tx++;
+ if (info->xmit.head == info->xmit.tail)
+ break;
+ } while (--count > 0);
+
+ if (CIRC_CNT(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("THRE...");
+#endif
+ if (intr_done)
+ *intr_done = 0;
+
+ if (info->xmit.head == info->xmit.tail) {
+ sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
+ }
+}
+
+static _INLINE_ void check_modem_status(struct async_struct *info)
+{
+ /* RTS/CTS are controled by HW. (if possible) */
+}
+
+/*
+ * This is the serial driver's interrupt routine for a single port
+ */
+static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
+{
+ int status;
+ int pass_counter = 0;
+ struct async_struct * info;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("rs_interrupt_single(%d)...", irq);
+#endif
+
+ info = IRQ_ports[irq];
+ if (!info || !info->tty)
+ return;
+
+ do {
+ status = sio_reg(info)->disr;
+#ifdef SERIAL_DEBUG_INTR
+ printk("status = %x...", status);
+#endif
+ if (!(sio_reg(info)->dicr & TXx927_SIDICR_TIE))
+ status &= ~TXx927_SIDISR_TDIS;
+ if (!(status & (TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT)))
+ break;
+
+ if (status & TXx927_SIDISR_RDIS)
+ receive_chars(info, &status);
+ check_modem_status(info);
+ if (status & TXx927_SIDISR_TDIS)
+ transmit_chars(info, 0);
+ /* Clear TX/RX Int. Status */
+ sio_reg(info)->disr &= ~(TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT);
+
+ if (pass_counter++ > RS_ISR_PASS_LIMIT) {
+#ifdef SERIAL_DEBUG_INTR
+ printk("rs_single loop break.\n");
+#endif
+ break;
+ }
+ } while (1);
+ info->last_active = jiffies;
+#ifdef SERIAL_DEBUG_INTR
+ printk("end.\n");
+#endif
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh(void)
+{
+ run_task_queue(&tq_serial);
+}
+
+static void do_softint(void *private_)
+{
+ struct async_struct *info = (struct async_struct *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+ 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 ? timeout : 1;
+}
+
+static int startup(struct async_struct * info)
+{
+ unsigned long flags;
+ int retval=0;
+ struct serial_state *state= info->state;
+ unsigned long page;
+
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ save_flags(flags); cli();
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ free_page(page);
+ goto errout;
+ }
+
+ if (!state->port) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+ free_page(page);
+ goto errout;
+ }
+ if (info->xmit.buf)
+ free_page(page);
+ else
+ info->xmit.buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttys%d (irq %d)...", info->line, state->irq);
+#endif
+
+ /*
+ * Clear the FIFO buffers and disable them
+ * (they will be reenabled in change_speed())
+ */
+ sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
+ TXx927_SIFCR_FRSTE;
+ /* clear reset */
+ sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
+ TXx927_SIFCR_FRSTE);
+
+ /*
+ * Allocate the IRQ if necessary
+ */
+ if (state->irq && (!IRQ_ports[state->irq] ||
+ !IRQ_ports[state->irq]->next_port)) {
+ if (IRQ_ports[state->irq]) {
+ retval = -EBUSY;
+ goto errout;
+ }
+
+ retval = request_irq(state->irq, rs_interrupt_single,
+ SA_INTERRUPT,
+ "txx927serial", NULL);
+ if (retval) {
+ if (capable(CAP_SYS_ADMIN)) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR,
+ &info->tty->flags);
+ retval = 0;
+ }
+ goto errout;
+ }
+ }
+
+ /*
+ * Insert serial port into IRQ chain.
+ */
+ info->prev_port = 0;
+ info->next_port = IRQ_ports[state->irq];
+ if (info->next_port)
+ info->next_port->prev_port = info;
+ IRQ_ports[state->irq] = info;
+ figure_IRQ_timeout(state->irq);
+
+ /*
+ * Clear the interrupt registers.
+ */
+ sio_reg(info)->disr = 0;
+
+ /*
+ * Now, initialize the UART
+ */
+ /* HW RTS/CTS control */
+ if (state->flags & ASYNC_HAVE_CTS_LINE)
+ sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
+ TXx927_SIFLCR_RTSTL_MAX /* 15 */;
+ /* Enable RX/TX */
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
+
+ /*
+ * Finally, enable interrupts
+ */
+ sio_reg(info)->dicr = TXx927_SIDICR_RIE;
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit.head = info->xmit.tail = 0;
+
+ /*
+ * Set up the tty->alt_speed kludge
+ */
+ if (info->tty) {
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ info->tty->alt_speed = 57600;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ info->tty->alt_speed = 115200;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ info->tty->alt_speed = 230400;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ info->tty->alt_speed = 460800;
+ }
+
+ /*
+ * and set the speed of the serial port
+ */
+ change_speed(info, 0);
+
+ info->flags |= ASYNC_INITIALIZED;
+ restore_flags(flags);
+ return 0;
+
+errout:
+ restore_flags(flags);
+ return retval;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(struct async_struct * info)
+{
+ unsigned long flags;
+ struct serial_state *state;
+ int retval;
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+ state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....", info->line,
+ state->irq);
+#endif
+
+ save_flags(flags); cli(); /* Disable interrupts */
+
+ /*
+ * First unlink the serial port from the IRQ chain...
+ */
+ if (info->next_port)
+ info->next_port->prev_port = info->prev_port;
+ if (info->prev_port)
+ info->prev_port->next_port = info->next_port;
+ else
+ IRQ_ports[state->irq] = info->next_port;
+ figure_IRQ_timeout(state->irq);
+
+ /*
+ * Free the IRQ, if necessary
+ */
+ if (state->irq && (!IRQ_ports[state->irq] ||
+ !IRQ_ports[state->irq]->next_port)) {
+ if (IRQ_ports[state->irq]) {
+ free_irq(state->irq, NULL);
+ retval = request_irq(state->irq, rs_interrupt_single,
+ SA_INTERRUPT, "txx927serial", NULL);
+
+ if (retval)
+ printk(KERN_WARNING "txx927serial shutdown: request_irq: error %d"
+ " Couldn't reacquire IRQ.\n", retval);
+ } else
+ free_irq(state->irq, NULL);
+ }
+
+ if (info->xmit.buf) {
+ free_page((unsigned long) info->xmit.buf);
+ info->xmit.buf = 0;
+ }
+
+ sio_reg(info)->dicr = 0; /* disable all intrs */
+
+ /* disable break condition */
+ sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
+
+ if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
+ /* drop RTS */
+ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
+ /* TXx927-SIO can not control DTR... */
+ }
+
+ /* reset FIFO's */
+ sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
+ TXx927_SIFCR_FRSTE;
+ /* clear reset */
+ sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
+ TXx927_SIFCR_FRSTE);
+
+ /* DON'T disable Rx/Tx here, ie. DON'T set either
+ * TXx927_SIFLCR_RSDE or TXx927_SIFLCR_TSDE in flcr
+ */
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ASYNC_INITIALIZED;
+ restore_flags(flags);
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct async_struct *info,
+ struct termios *old_termios)
+{
+ int quot = 0, baud_base, baud;
+ unsigned cflag, cval;
+ int bits;
+ unsigned long flags;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ if (!info->port)
+ return;
+
+ cval = sio_reg(info)->lcr;
+ /* byte size and parity */
+ cval &= ~TXx927_SILCR_UMODE_MASK;
+ switch (cflag & CSIZE) {
+ case CS7:
+ cval |= TXx927_SILCR_UMODE_7BIT;
+ bits = 9;
+ break;
+ case CS5: /* not supported */
+ case CS6: /* not supported */
+ case CS8:
+ default:
+ cval |= TXx927_SILCR_UMODE_8BIT;
+ bits = 10;
+ break;
+ }
+ cval &= ~TXx927_SILCR_USBL_MASK;
+ if (cflag & CSTOPB) {
+ cval |= TXx927_SILCR_USBL_2BIT;
+ bits++;
+ } else {
+ cval |= TXx927_SILCR_USBL_1BIT;
+ }
+
+ cval &= ~(TXx927_SILCR_UPEN|TXx927_SILCR_UEPS);
+ if (cflag & PARENB) {
+ cval |= TXx927_SILCR_UPEN;
+ bits++;
+ }
+ if (!(cflag & PARODD))
+ cval |= TXx927_SILCR_UEPS;
+
+ /* Determine divisor based on baud rate */
+ baud = tty_get_baud_rate(info->tty);
+ if (!baud)
+ baud = 9600; /* B0 transition handled in rs_set_termios */
+ baud_base = info->state->baud_base;
+ quot = (baud_base + baud / 2) / baud;
+ /* If the quotient is zero refuse the change */
+ if (!quot && old_termios) {
+ info->tty->termios->c_cflag &= ~CBAUD;
+ info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
+ baud = tty_get_baud_rate(info->tty);
+ if (!baud)
+ baud = 9600;
+ quot = (baud_base + baud / 2) / baud;
+ }
+ /* As a last resort, if the quotient is zero, default to 9600 bps */
+ if (!quot)
+ quot = (baud_base + 9600 / 2) / 9600;
+ info->quot = quot;
+ info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
+ info->timeout += HZ/50; /* Add .02 seconds of slop */
+
+ /* CTS flow control flag */
+ if (cflag & CRTSCTS) {
+ info->flags |= ASYNC_CTS_FLOW;
+ if (info->state->flags & ASYNC_HAVE_CTS_LINE)
+ sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
+ TXx927_SIFLCR_RTSTL_MAX /* 15 */;
+ } else {
+ info->flags &= ~ASYNC_CTS_FLOW;
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
+ }
+
+ /*
+ * Set up parity check flag
+ */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+ info->read_status_mask = TXx927_SIDISR_UOER |
+ TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS;
+ if (I_INPCK(info->tty))
+ info->read_status_mask |= TXx927_SIDISR_UFER | TXx927_SIDISR_UPER;
+ if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+ info->read_status_mask |= TXx927_SIDISR_UBRK;
+
+ /*
+ * Characters to ignore
+ */
+ info->ignore_status_mask = 0;
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= TXx927_SIDISR_UPER | TXx927_SIDISR_UFER;
+ if (I_IGNBRK(info->tty)) {
+ info->ignore_status_mask |= TXx927_SIDISR_UBRK;
+ /*
+ * If we're ignore parity and break indicators, ignore
+ * overruns too. (For real raw support).
+ */
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= TXx927_SIDISR_UOER;
+ }
+ /*
+ * !!! ignore all characters if CREAD is not set
+ */
+ if ((cflag & CREAD) == 0)
+ info->ignore_status_mask |= TXx927_SIDISR_RDIS;
+ save_flags(flags); cli();
+ sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
+ sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
+ restore_flags(flags);
+}
+
+static void rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_put_char"))
+ return;
+
+ if (!tty || !info->xmit.buf)
+ return;
+
+ save_flags(flags); cli();
+ if (CIRC_SPACE(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE) == 0) {
+ restore_flags(flags);
+ return;
+ }
+
+ info->xmit.buf[info->xmit.head++] = ch;
+ info->xmit.head &= SERIAL_XMIT_SIZE-1;
+ restore_flags(flags);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
+ return;
+
+ if (info->xmit.head == info->xmit.tail
+ || tty->stopped
+ || tty->hw_stopped
+ || !info->xmit.buf)
+ return;
+
+ save_flags(flags); cli();
+ sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
+ restore_flags(flags);
+}
+
+static int rs_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ int c, ret = 0;
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write"))
+ return 0;
+
+ if (!tty || !info->xmit.buf || !tmp_buf)
+ return 0;
+
+ save_flags(flags);
+
+ if (from_user) {
+ down(&tmp_buf_sem);
+ while (1) {
+ int c1;
+ c = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+
+ if (count < c)
+ c = count;
+ if (c <= 0)
+ break;
+
+ c -= copy_from_user(tmp_buf, buf, c);
+ if (!c) {
+ if (!ret)
+ ret = -EFAULT;
+ break;
+ }
+ cli();
+ c1 = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+
+ if (c1 < c)
+ c = c1;
+ memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
+ info->xmit.head = ((info->xmit.head + c) &
+ (SERIAL_XMIT_SIZE-1));
+ restore_flags(flags);
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ up(&tmp_buf_sem);
+ } else {
+ cli();
+ while (1) {
+ c = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+
+ if (count < c)
+ c = count;
+ if (c <= 0) {
+ break;
+ }
+ memcpy(info->xmit.buf + info->xmit.head, buf, c);
+ info->xmit.head = ((info->xmit.head + c) &
+ (SERIAL_XMIT_SIZE-1));
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ restore_flags(flags);
+ }
+ if (info->xmit.head != info->xmit.tail
+ && !tty->stopped
+ && !tty->hw_stopped
+ && !(info->IER & UART_IER_THRI))
+ sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
+
+ return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write_room"))
+ return 0;
+
+ return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
+ return 0;
+
+ return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+ return;
+ save_flags(flags); cli();
+ info->xmit.head = info->xmit.tail = 0;
+ restore_flags(flags);
+ 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 */
+ sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ rs_send_xchar(tty, STOP_CHAR(tty));
+
+ if (tty->termios->c_cflag & CRTSCTS) {
+ save_flags(flags); cli();
+ /* drop RTS */
+ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
+ restore_flags(flags);
+ }
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ rs_send_xchar(tty, START_CHAR(tty));
+ }
+ if (tty->termios->c_cflag & CRTSCTS) {
+ save_flags(flags); cli();
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
+ restore_flags(flags);
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_modem_info(struct async_struct * info, unsigned int *value)
+{
+ unsigned int result;
+ unsigned long flags;
+
+ save_flags(flags); cli();
+ result = ((sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
+ | ((sio_reg(info)->cisr & TXx927_SICISR_CTSS) ? 0 : TIOCM_CTS);
+ restore_flags(flags);
+ return put_user(result,value);
+}
+
+static int set_modem_info(struct async_struct * info, unsigned int cmd,
+ unsigned int *value)
+{
+ int error;
+ unsigned int arg;
+ unsigned long flags;
+
+ error = get_user(arg, value);
+ if (error)
+ return error;
+ save_flags(flags); cli();
+ switch (cmd) {
+ case TIOCMBIS:
+ if (arg & TIOCM_RTS)
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
+ break;
+ case TIOCMBIC:
+ if (arg & TIOCM_RTS)
+ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
+ break;
+ case TIOCMSET:
+ sio_reg(info)->flcr =
+ (sio_reg(info)->flcr & ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE)) |
+ ((arg & TIOCM_RTS) ? 0 : TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
+ break;
+ default:
+ error = -EINVAL;
+ }
+ restore_flags(flags);
+ return error;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static void rs_break(struct tty_struct *tty, int break_state)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_break"))
+ return;
+
+ if (!info->port)
+ return;
+ save_flags(flags); cli();
+ if (break_state == -1)
+ sio_reg(info)->flcr |= TXx927_SIFLCR_TBRK;
+ else
+ sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
+ restore_flags(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
+ (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TIOCMGET:
+ return get_modem_info(info, (unsigned int *) arg);
+ case TIOCMBIS:
+ case TIOCMBIC:
+ case TIOCMSET:
+ return set_modem_info(info, cmd, (unsigned int *) arg);
+ return 0;
+ case TIOCGSERIAL:
+ printk("TIOCGSERIAL\n");
+ return 0;
+ case TIOCSSERIAL:
+ printk("TIOCSSERIAL\n");
+ return 0;
+ case TIOCSERCONFIG:
+ printk("TIOCSERCONFIG\n");
+ return 0;
+
+ case TIOCSERGETLSR: /* Get line status register */
+ printk("TIOCSERGETLSR\n");
+ return 0;
+
+ case TIOCSERGSTRUCT:
+ printk("TIOCSERGSTRUCT\n");
+ return 0;
+
+ /*
+ * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+ * - mask passed in arg for lines of interest
+ * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ */
+ case TIOCMIWAIT:
+ printk("TIOCMIWAIT\n");
+ return 0;
+
+ /*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ * RI where only 0->1 is counted.
+ */
+ case TIOCGICOUNT:
+ printk("TIOCGICOUNT\n");
+ return 0;
+
+ case TIOCSERGWILD:
+ case TIOCSERSWILD:
+ /* "setserial -W" is called in Debian boot */
+ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+ unsigned int cflag = tty->termios->c_cflag;
+
+ if ( (cflag == old_termios->c_cflag)
+ && ( RELEVANT_IFLAG(tty->termios->c_iflag)
+ == RELEVANT_IFLAG(old_termios->c_iflag)))
+ return;
+
+ change_speed(info, old_termios);
+
+ /* Handle transition to B0 status */
+ if ((old_termios->c_cflag & CBAUD) &&
+ !(cflag & CBAUD)) {
+ save_flags(flags); cli();
+ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
+ restore_flags(flags);
+ }
+
+ /* Handle transition away from B0 status */
+ if (!(old_termios->c_cflag & CBAUD) &&
+ (cflag & CBAUD)) {
+ if (!(tty->termios->c_cflag & CRTSCTS) ||
+ !test_bit(TTY_THROTTLED, &tty->flags)) {
+ save_flags(flags); cli();
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
+ restore_flags(flags);
+ }
+ }
+
+ /* Handle turning off CRTSCTS */
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_start(tty);
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ *
+ * This routine is called when the serial port gets closed. First, we
+ * wait for the last remaining data to be sent. Then, we unlink its
+ * async structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ struct serial_state *state;
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+ return;
+
+ state = info->state;
+
+ save_flags(flags); cli();
+
+ if (tty_hung_up_p(filp)) {
+ restore_flags(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_close ttys%d, count = %d\n", info->line, state->count);
+#endif
+ if ((tty->count == 1) && (state->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. state->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk(KERN_WARNING "rs_close: bad serial port count; tty->count is 1, "
+ "state->count is %d\n", state->count);
+ state->count = 1;
+ }
+ if (--state->count < 0) {
+ printk(KERN_WARNING "rs_close: bad serial port count for ttys%d: %d\n",
+ info->line, state->count);
+ state->count = 0;
+ }
+ if (state->count) {
+ restore_flags(flags);
+ return;
+ }
+ info->flags |= ASYNC_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ info->state->normal_termios = *tty->termios;
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ info->state->callout_termios = *tty->termios;
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+ if (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->read_status_mask &= ~TXx927_SIDISR_RDIS;
+ if (info->flags & ASYNC_INITIALIZED) {
+#if 0
+ sio_reg(info)->dicr &= ~TXx927_SIDICR_RIE;
+#endif
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important if there is a transmit FIFO!
+ */
+ rs_wait_until_sent(tty, info->timeout);
+ }
+ shutdown(info);
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer(tty);
+ 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) {
+ 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);
+ restore_flags(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ unsigned long orig_jiffies, char_time;
+ int cisr;
+
+ if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
+ return;
+
+ if (info->xmit_fifo_size == 0)
+ return; /* Just in case.... */
+
+ orig_jiffies = jiffies;
+ /*
+ * Set the check interval to be 1/5 of the estimated time to
+ * send a single character, and make it at least 1. The check
+ * interval should also be less than the timeout.
+ *
+ * Note: we have to use pretty tight timings here to satisfy
+ * the NIST-PCTS.
+ */
+ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
+ char_time = char_time / 5;
+ if (char_time == 0)
+ char_time = 1;
+ if (timeout)
+ char_time = MIN(char_time, timeout);
+ /*
+ * If the transmitter hasn't cleared in twice the approximate
+ * amount of time to send the entire FIFO, it probably won't
+ * ever clear. This assumes the UART isn't doing flow
+ * control, which is currently the case. Hence, if it ever
+ * takes longer than info->timeout, this is probably due to a
+ * UART bug of some kind. So, we clamp the timeout parameter at
+ * 2*info->timeout.
+ */
+ if (!timeout || timeout > 2*info->timeout)
+ timeout = 2*info->timeout;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
+ printk("jiff=%lu...", jiffies);
+#endif
+ while (!((cisr = sio_reg(info)->cisr) & TXx927_SICISR_TXALS)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("cisr = %d (jiff=%lu)...", cisr, jiffies);
+#endif
+ current->state = TASK_INTERRUPTIBLE;
+ current->counter = 0; /* make us low-priority */
+ schedule_timeout(char_time);
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+ current->state = TASK_RUNNING;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("cisr = %d (jiff=%lu)...done\n", cisr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_hangup(struct tty_struct *tty)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ struct serial_state *state = info->state;
+
+ if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+ return;
+
+ state = info->state;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ state->count = 0;
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
+ info->tty = 0;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct async_struct *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct serial_state *state = info->state;
+ int retval;
+ int do_clocal = 0, extra_count = 0;
+ unsigned long flags;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ return ((info->flags & ASYNC_HUP_NOTIFY) ?
+ -EAGAIN : -ERESTARTSYS);
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= ASYNC_CALLOUT_ACTIVE;
+ return 0;
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & ASYNC_CALLOUT_ACTIVE) {
+ if (state->normal_termios.c_cflag & CLOCAL)
+ do_clocal = 1;
+ } else {
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+ }
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, state->count is dropped by one, so that
+ * rs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttys%d, count = %d\n",
+ state->line, state->count);
+#endif
+ save_flags(flags); cli();
+ if (!tty_hung_up_p(filp)) {
+ extra_count = 1;
+ state->count--;
+ }
+ restore_flags(flags);
+ info->blocked_open++;
+ while (1) {
+ save_flags(flags); cli();
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (tty->termios->c_cflag & CBAUD))
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
+ restore_flags(flags);
+ current->state = TASK_INTERRUPTIBLE;
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ !(info->flags & ASYNC_CLOSING))
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (extra_count)
+ state->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+static int get_async_struct(int line, struct async_struct **ret_info)
+{
+ struct async_struct *info;
+ struct serial_state *sstate;
+
+#ifdef REMOTE_DEBUG
+ if (kdb_port_info.state && line == kdb_port_info.line)
+ return -ENODEV;
+#endif
+ sstate = rs_table + line;
+ sstate->count++;
+ if (sstate->info) {
+ *ret_info = sstate->info;
+ return 0;
+ }
+ info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
+ if (!info) {
+ sstate->count--;
+ return -ENOMEM;
+ }
+ memset(info, 0, sizeof(struct async_struct));
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ init_waitqueue_head(&info->delta_msr_wait);
+ info->magic = SERIAL_MAGIC;
+ info->port = sstate->port;
+ info->flags = sstate->flags;
+ info->io_type = sstate->io_type;
+ info->xmit_fifo_size = sstate->xmit_fifo_size;
+ info->line = line;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->state = sstate;
+ if (sstate->info) {
+ kfree(info);
+ *ret_info = sstate->info;
+ return 0;
+ }
+ *ret_info = sstate->info = info;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct async_struct *info;
+ int retval, line;
+ unsigned long page;
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+ if ((line < 0) || (line >= NR_PORTS)) {
+ return -ENODEV;
+ }
+ retval = get_async_struct(line, &info);
+ if (retval) {
+ return retval;
+ }
+ tty->driver_data = info;
+ info->tty = tty;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
+ info->state->count);
+#endif
+ info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+ if (!tmp_buf) {
+ page = get_free_page(GFP_KERNEL);
+ if (!page) {
+ return -ENOMEM;
+ }
+ if (tmp_buf)
+ free_page(page);
+ else
+ tmp_buf = (unsigned char *) page;
+ }
+
+ /*
+ * If the port is the middle of closing, bail out now
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ return ((info->flags & ASYNC_HUP_NOTIFY) ?
+ -EAGAIN : -ERESTARTSYS);
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval) {
+ return retval;
+ }
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+ if ((info->state->count == 1) &&
+ (info->flags & ASYNC_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->state->normal_termios;
+ else
+ *tty->termios = info->state->callout_termios;
+ change_speed(info, 0);
+ }
+#ifdef CONFIG_TXX927_SERIAL_CONSOLE
+ if (sercons.cflag && sercons.index == line) {
+ tty->termios->c_cflag = sercons.cflag;
+ sercons.cflag = 0;
+ change_speed(info, 0);
+ }
+#endif
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open ttys%d successful...", info->line);
+#endif
+ return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline int line_info(char *buf, struct serial_state *state)
+{
+ struct async_struct *info = state->info, scr_info;
+ char stat_buf[30];
+ int ret;
+ unsigned long flags;
+
+ ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
+ state->line, SERIAL_DRIVER_NAME,
+ state->port, state->irq);
+
+ if (!state->port) {
+ ret += sprintf(buf+ret, "\n");
+ return ret;
+ }
+
+ /*
+ * Figure out the current RS-232 lines
+ */
+ if (!info) {
+ info = &scr_info; /* This is just for serial_{in,out} */
+
+ info->magic = SERIAL_MAGIC;
+ info->port = state->port;
+ info->flags = state->flags;
+ info->quot = 0;
+ info->tty = 0;
+ }
+
+ stat_buf[0] = 0;
+ stat_buf[1] = 0;
+ save_flags(flags); cli();
+ if (!(sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC))
+ strcat(stat_buf, "|RTS");
+ if (!(sio_reg(info)->cisr & TXx927_SICISR_CTSS))
+ strcat(stat_buf, "|CTS");
+ restore_flags(flags);
+
+ if (info->quot) {
+ ret += sprintf(buf+ret, " baud:%d",
+ state->baud_base / info->quot);
+ }
+
+ ret += sprintf(buf+ret, " tx:%d rx:%d",
+ state->icount.tx, state->icount.rx);
+
+ if (state->icount.frame)
+ ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
+
+ if (state->icount.parity)
+ ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
+
+ if (state->icount.brk)
+ ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
+
+ if (state->icount.overrun)
+ ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
+
+ /*
+ * Last thing is the RS-232 status lines
+ */
+ ret += sprintf(buf+ret, " %s\n", stat_buf+1);
+ return ret;
+}
+
+static int rs_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int i, len = 0, l;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+ for (i = 0; i < NR_PORTS && len < 4000; i++) {
+ l = line_info(page + len, &rs_table[i]);
+ len += l;
+ if (len+begin > off+count)
+ goto done;
+ if (len+begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+done:
+ if (off >= len+begin)
+ return 0;
+ *start = page + (begin-off);
+ return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+static _INLINE_ void show_serial_version(void)
+{
+ printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+}
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+static int __init rs_init(void)
+{
+ int i;
+ struct serial_state * state;
+
+ if (rs_table[0].port == 0)
+ return -ENODEV;
+
+ init_bh(TXX927_SERIAL_BH, do_serial_bh);
+ init_timer(&serial_timer);
+ serial_timer.function = rs_timer;
+ mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
+
+ for (i = 0; i < NR_IRQS; i++) {
+ IRQ_ports[i] = 0;
+ IRQ_timeout[i] = 0;
+ }
+#ifdef CONFIG_TXX927_SERIAL_CONSOLE
+ /*
+ * The interrupt of the serial console port
+ * can't be shared.
+ */
+ if (sercons.flags & CON_CONSDEV) {
+ for(i = 0; i < NR_PORTS; i++)
+ if (i != sercons.index &&
+ rs_table[i].irq == rs_table[sercons.index].irq)
+ rs_table[i].irq = 0;
+ }
+#endif
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+ serial_driver.driver_name = "txx927serial";
+#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
+ serial_driver.name = "tts/%d";
+#else
+ serial_driver.name = "ttyS";
+#endif
+ serial_driver.major = TXX927_TTY_MAJOR;
+ serial_driver.minor_start = TXX927_TTY_MINOR_START + SERIAL_DEV_OFFSET;
+ serial_driver.num = NR_PORTS;
+ serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+ serial_driver.subtype = SERIAL_TYPE_NORMAL;
+ serial_driver.init_termios = tty_std_termios;
+ serial_driver.init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
+ serial_driver.refcount = &serial_refcount;
+ serial_driver.table = serial_table;
+ serial_driver.termios = serial_termios;
+ serial_driver.termios_locked = serial_termios_locked;
+
+ serial_driver.open = rs_open;
+ serial_driver.close = rs_close;
+ serial_driver.write = rs_write;
+ serial_driver.put_char = rs_put_char;
+ serial_driver.flush_chars = rs_flush_chars;
+ serial_driver.write_room = rs_write_room;
+ serial_driver.chars_in_buffer = rs_chars_in_buffer;
+ serial_driver.flush_buffer = rs_flush_buffer;
+ serial_driver.ioctl = rs_ioctl;
+ serial_driver.throttle = rs_throttle;
+ serial_driver.unthrottle = rs_unthrottle;
+ serial_driver.send_xchar = rs_send_xchar;
+ serial_driver.set_termios = rs_set_termios;
+ serial_driver.stop = rs_stop;
+ serial_driver.start = rs_start;
+ serial_driver.hangup = rs_hangup;
+ serial_driver.break_ctl = rs_break;
+ serial_driver.wait_until_sent = rs_wait_until_sent;
+ serial_driver.read_proc = rs_read_proc;
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
+ callout_driver.name = "cua/%d";
+#else
+ callout_driver.name = "cua";
+#endif
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+ callout_driver.read_proc = 0;
+ callout_driver.proc_entry = 0;
+
+ if (tty_register_driver(&serial_driver)){
+ panic("Couldn't register serial driver\n");
+ }
+ if (tty_register_driver(&callout_driver)) {
+ panic("Couldn't register callout driver\n");
+ }
+
+ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+ state->magic = SSTATE_MAGIC;
+ state->line = i;
+ state->type = PORT_UNKNOWN;
+ state->custom_divisor = 0;
+ state->close_delay = 5*HZ/10;
+ state->closing_wait = 30*HZ;
+ state->callout_termios = callout_driver.init_termios;
+ state->normal_termios = serial_driver.init_termios;
+ state->icount.cts = state->icount.dsr =
+ state->icount.rng = state->icount.dcd = 0;
+ state->icount.rx = state->icount.tx = 0;
+ state->icount.frame = state->icount.parity = 0;
+ state->icount.overrun = state->icount.brk = 0;
+ state->irq = irq_cannonicalize(state->irq);
+ state->xmit_fifo_size = TXx927_SIO_TX_FIFO;
+ if (state->hub6)
+ state->io_type = SERIAL_IO_HUB6;
+ if (state->port) {
+ continue;
+ }
+ }
+
+ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+ if (state->type == PORT_UNKNOWN) {
+ continue;
+ }
+ printk(KERN_INFO "%s%02d at 0x%04lx (irq = %d) is a %s\n",
+ TXX927_TTY_NAME,
+ state->line,
+ state->port, state->irq,
+ SERIAL_DRIVER_NAME);
+ tty_register_devfs(&serial_driver, 0,
+ serial_driver.minor_start + state->line);
+ tty_register_devfs(&callout_driver, 0,
+ callout_driver.minor_start + state->line);
+ }
+ return 0;
+}
+
+static void __exit rs_fini(void)
+{
+ unsigned long flags;
+ int e1, e2;
+ int i;
+ struct async_struct *info;
+
+ del_timer_sync(&serial_timer);
+ save_flags(flags); cli();
+ remove_bh(TXX927_SERIAL_BH);
+ if ((e1 = tty_unregister_driver(&serial_driver)))
+ printk(KERN_WARNING "serial: failed to unregister serial driver (%d)\n",
+ e1);
+ if ((e2 = tty_unregister_driver(&callout_driver)))
+ printk(KERN_WARNING "serial: failed to unregister callout driver (%d)\n",
+ e2);
+ restore_flags(flags);
+
+ for (i = 0; i < NR_PORTS; i++) {
+ if ((info = rs_table[i].info)) {
+ rs_table[i].info = NULL;
+ kfree(info);
+ }
+ }
+ if (tmp_buf) {
+ unsigned long pg = (unsigned long) tmp_buf;
+ tmp_buf = NULL;
+ free_page(pg);
+ }
+}
+
+module_init(rs_init);
+module_exit(rs_fini);
+MODULE_DESCRIPTION("TXX927 serial driver");
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+#ifdef CONFIG_TXX927_SERIAL_CONSOLE
+
+static struct async_struct async_sercons;
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+static void serial_console_write(struct console *co, const char *s,
+ unsigned count)
+{
+ static struct async_struct *info = &async_sercons;
+ int ier;
+ unsigned i;
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = sio_reg(info)->dicr;
+ sio_reg(info)->dicr = 0;
+
+
+ /*
+ * Now, do each character
+ */
+ for (i = 0; i < count; i++, s++) {
+ wait_for_xmitr(info);
+
+ /*
+ * Send the character out.
+ * If a LF, also do CR...
+ */
+ sio_reg(info)->tfifo = *s;
+ if (*s == 10) {
+ wait_for_xmitr(info);
+ sio_reg(info)->tfifo = 13;
+ }
+ }
+
+ /*
+ * Finally, Wait for transmitter & holding register to empty
+ * and restore the IER
+ */
+ wait_for_xmitr(info);
+ sio_reg(info)->dicr = ier;
+}
+
+static kdev_t serial_console_device(struct console *c)
+{
+ return MKDEV(TXX927_TTY_MAJOR, TXX927_TTY_MINOR_START + c->index);
+}
+
+/*
+ * Setup initial baud/bits/parity. We do two things here:
+ * - construct a cflag setting for the first rs_open()
+ * - initialize the serial port
+ * Return non-zero if we didn't find a serial port.
+ */
+static int serial_console_setup(struct console *co, char *options)
+{
+ static struct async_struct *info;
+ struct serial_state *state;
+ unsigned cval;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int cflag = CREAD | HUPCL | CLOCAL;
+ int quot = 0;
+ char *s;
+
+ if (co->index < 0 || co->index >= NR_PORTS) {
+ return -1;
+ }
+ if (options) {
+ baud = simple_strtoul(options, NULL, 10);
+ s = options;
+ while(*s >= '0' && *s <= '9')
+ s++;
+ if (*s) parity = *s++;
+ if (*s) bits = *s - '0';
+ }
+
+ /*
+ * Now construct a cflag setting.
+ */
+ switch(baud) {
+ case 1200:
+ cflag |= B1200;
+ break;
+ case 2400:
+ cflag |= B2400;
+ break;
+ case 4800:
+ cflag |= B4800;
+ break;
+ case 19200:
+ cflag |= B19200;
+ break;
+ case 38400:
+ cflag |= B38400;
+ break;
+ case 57600:
+ cflag |= B57600;
+ break;
+ case 115200:
+ cflag |= B115200;
+ break;
+ case 9600:
+ default:
+ cflag |= B9600;
+ break;
+ }
+ switch(bits) {
+ case 7:
+ cflag |= CS7;
+ break;
+ default:
+ case 8:
+ cflag |= CS8;
+ break;
+ }
+ switch(parity) {
+ case 'o': case 'O':
+ cflag |= PARODD;
+ break;
+ case 'e': case 'E':
+ cflag |= PARENB;
+ break;
+ }
+ co->cflag = cflag;
+
+ /*
+ * Divisor, bytesize and parity
+ */
+ state = rs_table + co->index;
+ info = &async_sercons;
+ info->magic = SERIAL_MAGIC;
+ info->state = state;
+ info->port = state->port;
+ info->flags = state->flags;
+ info->io_type = state->io_type;
+ info->iomem_base = state->iomem_base;
+ info->iomem_reg_shift = state->iomem_reg_shift;
+ quot = state->baud_base / baud;
+
+ switch (cflag & CSIZE) {
+ case CS7: cval = TXx927_SILCR_UMODE_7BIT; break;
+ default:
+ case CS8: cval = TXx927_SILCR_UMODE_8BIT; break;
+ }
+ if (cflag & CSTOPB)
+ cval |= TXx927_SILCR_USBL_2BIT;
+ else
+ cval |= TXx927_SILCR_USBL_1BIT;
+ if (cflag & PARENB)
+ cval |= TXx927_SILCR_UPEN;
+ if (!(cflag & PARODD))
+ cval |= TXx927_SILCR_UEPS;
+
+ /*
+ * Disable UART interrupts, set DTR and RTS high
+ * and set speed.
+ */
+ sio_reg(info)->dicr = 0;
+ sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
+ sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
+ /* HW RTS/CTS control */
+ if (info->flags & ASYNC_HAVE_CTS_LINE)
+ sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
+ TXx927_SIFLCR_RTSTL_MAX /* 15 */;
+ /* Enable RX/TX */
+ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
+
+ return 0;
+}
+
+static struct console sercons = {
+ name: TXX927_TTY_NAME,
+ write: serial_console_write,
+ device: serial_console_device,
+ setup: serial_console_setup,
+ flags: CON_PRINTBUFFER,
+ index: -1,
+};
+
+/*
+ * Register console.
+ */
+void __init txx927_console_init(void)
+{
+ register_console(&sercons);
+}
+#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)