| /* |
| * |
| * BRIEF MODULE DESCRIPTION |
| * Au1x00 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_AU1X00_SERIAL_CONSOLE |
| #endif |
| |
| #define CONFIG_SERIAL_RSA |
| |
| #define RS_STROBE_TIME (10*HZ) |
| #define RS_ISR_PASS_LIMIT 256 |
| |
| /* |
| * End of serial driver configuration section. |
| */ |
| |
| #include <linux/module.h> |
| |
| #include <linux/types.h> |
| #ifdef LOCAL_HEADERS |
| #include "serial_local.h" |
| #else |
| #include <linux/serial.h> |
| #include <linux/serialP.h> |
| #include <asm/au1000.h> |
| #include <asm/serial.h> |
| #define LOCAL_VERSTRING "" |
| #endif |
| |
| #include <linux/errno.h> |
| #include <linux/signal.h> |
| #include <linux/sched.h> |
| #include <linux/timer.h> |
| #include <linux/interrupt.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| #include <linux/major.h> |
| #include <linux/string.h> |
| #include <linux/fcntl.h> |
| #include <linux/ptrace.h> |
| #include <linux/ioport.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <asm/uaccess.h> |
| #include <linux/delay.h> |
| #ifdef CONFIG_AU1X00_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_au1x00_uart_baud_base(void); |
| |
| /* serial subtype definitions */ |
| #ifndef SERIAL_TYPE_NORMAL |
| #define SERIAL_TYPE_NORMAL 1 |
| #define SERIAL_TYPE_CALLOUT 2 |
| #endif |
| |
| /* number of characters left in xmit buffer before we ask for more */ |
| #define WAKEUP_CHARS 256 |
| |
| /* |
| * IRQ_timeout - How long the timeout should be for each IRQ |
| * should be after the IRQ has been active. |
| */ |
| |
| static struct async_struct *IRQ_ports[NR_IRQS]; |
| static int IRQ_timeout[NR_IRQS]; |
| #ifdef CONFIG_AU1X00_SERIAL_CONSOLE |
| static struct console sercons; |
| static int lsr_break_flag; |
| #endif |
| #if defined(CONFIG_AU1X00_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 spinlock_t serial_lock = SPIN_LOCK_UNLOCKED; |
| |
| static inline int serial_paranoia_check(struct async_struct *info, |
| kdev_t device, const char *routine) |
| { |
| #ifdef SERIAL_PARANOIA_CHECK |
| static const char *badmagic = |
| "Warning: bad magic number for serial struct (%s) in %s\n"; |
| static const char *badinfo = |
| "Warning: null async_struct for (%s) in %s\n"; |
| |
| if (!info) { |
| printk(badinfo, kdevname(device), routine); |
| return 1; |
| } |
| if (info->magic != SERIAL_MAGIC) { |
| printk(badmagic, kdevname(device), routine); |
| return 1; |
| } |
| #endif |
| return 0; |
| } |
| |
| static _INLINE_ unsigned int serial_in(struct async_struct *info, int offset) |
| { |
| return (au_readl(info->port+offset) & 0xffff); |
| } |
| |
| static _INLINE_ void serial_out(struct async_struct *info, int offset, int value) |
| { |
| au_writel(value & 0xffff, info->port+offset); |
| } |
| |
| |
| /* |
| * We used to support using pause I/O for certain machines. We |
| * haven't supported this for a while, but just in case it's badly |
| * needed for certain old 386 machines, I've left these #define's |
| * in.... |
| */ |
| #define serial_inp(info, offset) serial_in(info, offset) |
| #define serial_outp(info, offset, value) serial_out(info, offset, value) |
| |
| |
| /* |
| * ------------------------------------------------------------ |
| * rs_stop() and rs_start() |
| * |
| * This routines are called before setting or resetting tty->stopped. |
| * They enable or disable transmitter interrupts, as necessary. |
| * ------------------------------------------------------------ |
| */ |
| static void rs_stop(struct tty_struct *tty) |
| { |
| struct async_struct *info = (struct async_struct *)tty->driver_data; |
| unsigned long flags; |
| |
| if (serial_paranoia_check(info, tty->device, "rs_stop")) |
| return; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| if (info->IER & UART_IER_THRI) { |
| info->IER &= ~UART_IER_THRI; |
| serial_out(info, UART_IER, info->IER); |
| } |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| 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); |
| } |
| spin_unlock_irqrestore(&serial_lock, 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_AU1X00_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_AU1X00_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_AU1X00_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; |
| spin_lock_irqsave(&serial_lock, flags); |
| rs_interrupt_single(i, NULL, NULL); |
| spin_unlock_irqrestore(&serial_lock, flags); |
| } |
| } |
| last_strobe = jiffies; |
| mod_timer(&serial_timer, jiffies + RS_STROBE_TIME); |
| |
| #if 0 |
| if (IRQ_ports[0]) { |
| spin_lock_irqsave(&serial_lock, flags); |
| rs_interrupt_single(0, NULL, NULL); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| |
| if (info->flags & ASYNC_INITIALIZED) { |
| free_page(page); |
| goto errout; |
| } |
| |
| if (!CONFIGURED_SERIAL_PORT(state) || !state->type) { |
| if (info->tty) |
| set_bit(TTY_IO_ERROR, &info->tty->flags); |
| free_page(page); |
| goto errout; |
| } |
| if (info->xmit.buf) |
| free_page(page); |
| else |
| info->xmit.buf = (unsigned char *) page; |
| |
| |
| if (au_readl(UART_MOD_CNTRL + state->port) != 0x3) { |
| au_writel(3, UART_MOD_CNTRL + state->port); |
| au_sync_delay(10); |
| } |
| #ifdef SERIAL_DEBUG_OPEN |
| printk("starting up ttys%d (irq %d)...", info->line, state->irq); |
| #endif |
| |
| |
| /* |
| * Clear the FIFO buffers and disable them |
| * (they will be reenabled in change_speed()) |
| */ |
| if (uart_config[state->type].flags & UART_CLEAR_FIFO) { |
| serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO); |
| serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO | |
| UART_FCR_CLEAR_RCVR | |
| UART_FCR_CLEAR_XMIT)); |
| serial_outp(info, UART_FCR, 0); |
| } |
| |
| /* |
| * Clear the interrupt registers. |
| */ |
| (void) serial_inp(info, UART_LSR); |
| (void) serial_inp(info, UART_RX); |
| (void) serial_inp(info, UART_IIR); |
| (void) serial_inp(info, UART_MSR); |
| |
| /* |
| * At this point there's no way the LSR could still be 0xFF; |
| * if it is, then bail out, because there's likely no UART |
| * here. |
| */ |
| if (!(info->flags & ASYNC_BUGGY_UART) && |
| (serial_inp(info, UART_LSR) == 0xff)) { |
| printk("LSR safety check engaged!\n"); |
| if (capable(CAP_SYS_ADMIN)) { |
| if (info->tty) |
| set_bit(TTY_IO_ERROR, &info->tty->flags); |
| } else |
| retval = -ENODEV; |
| goto errout; |
| } |
| |
| /* |
| * Allocate the IRQ if necessary |
| */ |
| #if 0 |
| /* au1000, uart0 irq is 0 */ |
| if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { |
| #endif |
| if ((!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { |
| if (IRQ_ports[state->irq]) { |
| retval = -EBUSY; |
| goto errout; |
| } else |
| handler = rs_interrupt_single; |
| |
| retval = request_irq(state->irq, handler, SA_SHIRQ, |
| "serial", &IRQ_ports[state->irq]); |
| if (retval) { |
| if (capable(CAP_SYS_ADMIN)) { |
| if (info->tty) |
| set_bit(TTY_IO_ERROR, |
| &info->tty->flags); |
| retval = 0; |
| } |
| goto errout; |
| } |
| } |
| |
| /* |
| * Insert serial port into IRQ chain. |
| */ |
| info->prev_port = 0; |
| info->next_port = IRQ_ports[state->irq]; |
| if (info->next_port) |
| info->next_port->prev_port = info; |
| IRQ_ports[state->irq] = info; |
| figure_IRQ_timeout(state->irq); |
| |
| /* |
| * Now, initialize the UART |
| */ |
| serial_outp(info, UART_LCR, UART_LCR_WLEN8); |
| |
| info->MCR = 0; |
| if (info->tty->termios->c_cflag & CBAUD) |
| info->MCR = UART_MCR_DTR | UART_MCR_RTS; |
| { |
| if (state->irq != 0) |
| info->MCR |= UART_MCR_OUT2; |
| } |
| info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */ |
| serial_outp(info, UART_MCR, info->MCR); |
| |
| /* |
| * Finally, enable interrupts |
| */ |
| info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; |
| serial_outp(info, UART_IER, info->IER); /* enable interrupts */ |
| |
| |
| /* |
| * And clear the interrupt registers again for luck. |
| */ |
| (void)serial_inp(info, UART_LSR); |
| (void)serial_inp(info, UART_RX); |
| (void)serial_inp(info, UART_IIR); |
| (void)serial_inp(info, UART_MSR); |
| |
| if (info->tty) |
| clear_bit(TTY_IO_ERROR, &info->tty->flags); |
| info->xmit.head = info->xmit.tail = 0; |
| |
| /* |
| * Set up serial timers... |
| */ |
| mod_timer(&serial_timer, jiffies + 2*HZ/100); |
| |
| /* |
| * Set up the tty->alt_speed kludge |
| */ |
| if (info->tty) { |
| if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| info->tty->alt_speed = 57600; |
| if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| info->tty->alt_speed = 115200; |
| if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
| info->tty->alt_speed = 230400; |
| if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
| info->tty->alt_speed = 460800; |
| } |
| |
| /* |
| * and set the speed of the serial port |
| */ |
| change_speed(info, 0); |
| |
| info->flags |= ASYNC_INITIALIZED; |
| spin_unlock_irqrestore(&serial_lock, flags); |
| return 0; |
| |
| errout: |
| spin_unlock_irqrestore(&serial_lock, 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 |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| |
| /* |
| * clear delta_msr_wait queue to avoid mem leaks: we may free the irq |
| * here so the queue might never be waken up |
| */ |
| wake_up_interruptible(&info->delta_msr_wait); |
| |
| /* |
| * First unlink the serial port from the IRQ chain... |
| */ |
| if (info->next_port) |
| info->next_port->prev_port = info->prev_port; |
| if (info->prev_port) |
| info->prev_port->next_port = info->next_port; |
| else |
| IRQ_ports[state->irq] = info->next_port; |
| figure_IRQ_timeout(state->irq); |
| |
| /* |
| * Free the IRQ, if necessary |
| */ |
| // if (state->irq && (!IRQ_ports[state->irq] || |
| if ((!IRQ_ports[state->irq] || |
| !IRQ_ports[state->irq]->next_port)) { |
| if (IRQ_ports[state->irq]) { |
| free_irq(state->irq, &IRQ_ports[state->irq]); |
| retval = request_irq(state->irq, rs_interrupt_single, |
| SA_SHIRQ, "serial", |
| &IRQ_ports[state->irq]); |
| |
| if (retval) |
| printk("serial shutdown: request_irq: error %d" |
| " Couldn't reacquire IRQ.\n", retval); |
| } else |
| free_irq(state->irq, &IRQ_ports[state->irq]); |
| } |
| |
| if (info->xmit.buf) { |
| unsigned long pg = (unsigned long) info->xmit.buf; |
| info->xmit.buf = 0; |
| free_page(pg); |
| } |
| |
| info->IER = 0; |
| serial_outp(info, UART_IER, 0x00); /* disable all intrs */ |
| info->MCR &= ~UART_MCR_OUT2; |
| info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */ |
| |
| /* disable break condition */ |
| serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC); |
| |
| if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) |
| info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); |
| serial_outp(info, UART_MCR, info->MCR); |
| |
| /* disable FIFO's */ |
| serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO | |
| UART_FCR_CLEAR_RCVR | |
| UART_FCR_CLEAR_XMIT)); |
| serial_outp(info, UART_FCR, 0); |
| |
| (void)serial_in(info, UART_RX); /* read data port to reset things */ |
| |
| if (info->tty) |
| set_bit(TTY_IO_ERROR, &info->tty->flags); |
| |
| info->flags &= ~ASYNC_INITIALIZED; |
| #ifndef CONFIG_KGDB |
| au_writel(0, UART_MOD_CNTRL + state->port); |
| au_sync_delay(10); |
| #endif |
| spin_unlock_irqrestore(&serial_lock, flags); |
| } |
| |
| |
| /* |
| * This routine is called to set the UART divisor registers to match |
| * the specified baud rate for a serial port. |
| */ |
| static void change_speed(struct async_struct *info, |
| struct termios *old_termios) |
| { |
| int quot = 0, baud_base, baud; |
| unsigned cflag, cval, fcr = 0; |
| int bits; |
| unsigned long flags; |
| |
| if (!info->tty || !info->tty->termios) |
| return; |
| cflag = info->tty->termios->c_cflag; |
| if (!CONFIGURED_SERIAL_PORT(info)) |
| return; |
| |
| /* byte size and parity */ |
| switch (cflag & CSIZE) { |
| case CS5: cval = 0x00; bits = 7; break; |
| case CS6: cval = 0x01; bits = 8; break; |
| case CS7: cval = 0x02; bits = 9; break; |
| case CS8: cval = 0x03; bits = 10; break; |
| /* Never happens, but GCC is too dumb to figure it out */ |
| default: cval = 0x00; bits = 7; break; |
| } |
| if (cflag & CSTOPB) { |
| cval |= 0x04; |
| bits++; |
| } |
| if (cflag & PARENB) { |
| cval |= UART_LCR_PARITY; |
| bits++; |
| } |
| if (!(cflag & PARODD)) |
| cval |= UART_LCR_EPAR; |
| #ifdef CMSPAR |
| if (cflag & CMSPAR) |
| cval |= UART_LCR_SPAR; |
| #endif |
| |
| /* Determine divisor based on baud rate */ |
| baud = tty_get_baud_rate(info->tty); |
| if (!baud) { |
| baud = 9600; /* B0 transition handled in rs_set_termios */ |
| } |
| baud_base = get_au1x00_uart_baud_base(); |
| |
| //if (baud == 38400 && |
| if (((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) { |
| quot = info->state->custom_divisor; |
| } |
| else { |
| if (baud == 134) |
| /* Special case since 134 is really 134.5 */ |
| quot = (2*baud_base / 269); |
| else if (baud) |
| quot = baud_base / baud; |
| } |
| /* If the quotient is zero refuse the change */ |
| if (!quot && old_termios) { |
| info->tty->termios->c_cflag &= ~CBAUD; |
| info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); |
| baud = tty_get_baud_rate(info->tty); |
| if (!baud) |
| baud = 9600; |
| if (baud == 38400 && |
| ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
| quot = info->state->custom_divisor; |
| else { |
| if (baud == 134) |
| /* Special case since 134 is really 134.5 */ |
| quot = (2*baud_base / 269); |
| else if (baud) |
| quot = baud_base / baud; |
| } |
| } |
| /* As a last resort, if the quotient is zero, default to 9600 bps */ |
| if (!quot) |
| quot = baud_base / 9600; |
| |
| info->quot = quot; |
| info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); |
| info->timeout += HZ/50; /* Add .02 seconds of slop */ |
| |
| /* Set up FIFO's */ |
| if (uart_config[info->state->type].flags & UART_USE_FIFO) { |
| if ((info->state->baud_base / quot) < 2400) |
| fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_1; |
| else |
| fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_8; |
| } |
| |
| /* CTS flow control flag and modem status interrupts */ |
| info->IER &= ~UART_IER_MSI; |
| if (info->flags & ASYNC_HARDPPS_CD) |
| info->IER |= UART_IER_MSI; |
| if (cflag & CRTSCTS) { |
| info->flags |= ASYNC_CTS_FLOW; |
| info->IER |= UART_IER_MSI; |
| } else |
| info->flags &= ~ASYNC_CTS_FLOW; |
| if (cflag & CLOCAL) |
| info->flags &= ~ASYNC_CHECK_CD; |
| else { |
| info->flags |= ASYNC_CHECK_CD; |
| info->IER |= UART_IER_MSI; |
| } |
| serial_out(info, UART_IER, info->IER); |
| |
| /* |
| * Set up parity check flag |
| */ |
| #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
| |
| info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
| if (I_INPCK(info->tty)) |
| info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) |
| info->read_status_mask |= UART_LSR_BI; |
| |
| /* |
| * Characters to ignore |
| */ |
| info->ignore_status_mask = 0; |
| if (I_IGNPAR(info->tty)) |
| info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| if (I_IGNBRK(info->tty)) { |
| info->ignore_status_mask |= UART_LSR_BI; |
| /* |
| * If we're ignore parity and break indicators, ignore |
| * overruns too. (For real raw support). |
| */ |
| if (I_IGNPAR(info->tty)) |
| info->ignore_status_mask |= UART_LSR_OE; |
| } |
| /* |
| * !!! ignore all characters if CREAD is not set |
| */ |
| if ((cflag & CREAD) == 0) |
| info->ignore_status_mask |= UART_LSR_DR; |
| spin_lock_irqsave(&serial_lock, flags); |
| |
| serial_outp(info, UART_CLK, quot & 0xffff); |
| serial_outp(info, UART_LCR, cval); |
| info->LCR = cval; /* Save LCR */ |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| if (CIRC_SPACE(info->xmit.head, |
| info->xmit.tail, |
| SERIAL_XMIT_SIZE) == 0) { |
| spin_unlock_irqrestore(&serial_lock, flags); |
| return; |
| } |
| |
| info->xmit.buf[info->xmit.head] = ch; |
| info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| info->IER |= UART_IER_THRI; |
| serial_out(info, UART_IER, info->IER); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, 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)); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| } |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_lock_irqsave(&serial_lock, flags); |
| info->xmit.head = info->xmit.tail = 0; |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| serial_out(info, UART_MCR, info->MCR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_lock_irqsave(&serial_lock, flags); |
| serial_out(info, UART_MCR, info->MCR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| status = serial_in(info, UART_LSR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_lock_irqsave(&serial_lock, flags); |
| status = serial_in(info, UART_MSR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| } |
| spin_lock_irqsave(&serial_lock, flags); |
| info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */ |
| serial_out(info, UART_MCR, info->MCR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_lock_irqsave(&serial_lock, flags); |
| if (break_state == -1) |
| info->LCR |= UART_LCR_SBC; |
| else |
| info->LCR &= ~UART_LCR_SBC; |
| serial_out(info, UART_LCR, info->LCR); |
| spin_unlock_irqrestore(&serial_lock, 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: |
| spin_lock_irqsave(&serial_lock, flags); |
| /* note the counters on entry */ |
| cprev = info->state->icount; |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_lock_irqsave(&serial_lock, flags); |
| cnow = info->state->icount; /* atomic copy */ |
| spin_unlock_irqrestore(&serial_lock, 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: |
| spin_lock_irqsave(&serial_lock, flags); |
| cnow = info->state->icount; |
| spin_unlock_irqrestore(&serial_lock, 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); |
| spin_lock_irqsave(&serial_lock, flags); |
| serial_out(info, UART_MCR, info->MCR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| } |
| spin_lock_irqsave(&serial_lock, flags); |
| serial_out(info, UART_MCR, info->MCR); |
| spin_unlock_irqrestore(&serial_lock, 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; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| |
| if (tty_hung_up_p(filp)) { |
| DBG_CNT("before DEC-hung"); |
| MOD_DEC_USE_COUNT; |
| spin_unlock_irqrestore(&serial_lock, 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; |
| spin_unlock_irqrestore(&serial_lock, flags); |
| return; |
| } |
| info->flags |= ASYNC_CLOSING; |
| spin_unlock_irqrestore(&serial_lock, 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 (state->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| tty_wait_until_sent(tty, state->closing_wait); |
| /* |
| * At this point we stop accepting input. To do this, we |
| * disable the receive line status interrupts, and tell the |
| * interrupt driver to stop checking the data ready bit in the |
| * line status register. |
| */ |
| info->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 (state->close_delay) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| schedule_timeout(state->close_delay); |
| } |
| wake_up_interruptible(&info->open_wait); |
| } |
| info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| |
| ASYNC_CLOSING); |
| wake_up_interruptible(&info->close_wait); |
| 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 |
| spin_lock_irqsave(&serial_lock, flags); |
| if (!tty_hung_up_p(filp)) { |
| extra_count = 1; |
| state->count--; |
| } |
| spin_unlock_irqrestore(&serial_lock, flags); |
| info->blocked_open++; |
| while (1) { |
| spin_lock_irqsave(&serial_lock, flags); |
| 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)); |
| spin_unlock_irqrestore(&serial_lock, 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_AU1X00_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; |
| } |
| spin_lock_irqsave(&serial_lock, flags); |
| status = serial_in(info, UART_MSR); |
| control = info != &scr_info ? info->MCR : serial_in(info, UART_MCR); |
| spin_unlock_irqrestore(&serial_lock, flags); |
| |
| stat_buf[0] = 0; |
| stat_buf[1] = 0; |
| if (control & UART_MCR_RTS) |
| strcat(stat_buf, "|RTS"); |
| if (status & UART_MSR_CTS) |
| strcat(stat_buf, "|CTS"); |
| if (control & UART_MCR_DTR) |
| strcat(stat_buf, "|DTR"); |
| if (status & UART_MSR_DSR) |
| strcat(stat_buf, "|DSR"); |
| if (status & UART_MSR_DCD) |
| strcat(stat_buf, "|CD"); |
| if (status & UART_MSR_RI) |
| strcat(stat_buf, "|RI"); |
| |
| if (info->quot) { |
| ret += sprintf(buf+ret, " baud:%d", |
| state->baud_base / info->quot); |
| } |
| |
| ret += sprintf(buf+ret, " tx:%d rx:%d", |
| state->icount.tx, state->icount.rx); |
| |
| if (state->icount.frame) |
| ret += sprintf(buf+ret, " fe:%d", state->icount.frame); |
| |
| if (state->icount.parity) |
| ret += sprintf(buf+ret, " pe:%d", state->icount.parity); |
| |
| if (state->icount.brk) |
| ret += sprintf(buf+ret, " brk:%d", state->icount.brk); |
| |
| if (state->icount.overrun) |
| ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); |
| |
| /* |
| * Last thing is the RS-232 status lines |
| */ |
| ret += sprintf(buf+ret, " %s\n", stat_buf+1); |
| return ret; |
| } |
| |
| int rs_read_proc(char *page, char **start, off_t off, int count, |
| int *eof, void *data) |
| { |
| int i, len = 0, l; |
| off_t begin = 0; |
| |
| len += sprintf(page, "serinfo:1.0 driver:%s%s revision:%s\n", |
| serial_version, LOCAL_VERSTRING, serial_revdate); |
| for (i = 0; i < NR_PORTS && len < 4000; i++) { |
| l = line_info(page + len, &rs_table[i]); |
| len += l; |
| if (len+begin > off+count) |
| goto done; |
| if (len+begin < off) { |
| begin += len; |
| len = 0; |
| } |
| } |
| *eof = 1; |
| done: |
| if (off >= len+begin) |
| return 0; |
| *start = page + (off-begin); |
| return ((count < begin+len-off) ? count : begin+len-off); |
| } |
| |
| /* |
| * --------------------------------------------------------------------- |
| * rs_init() and friends |
| * |
| * rs_init() is called at boot-time to initialize the serial driver. |
| * --------------------------------------------------------------------- |
| */ |
| |
| /* |
| * This routine prints out the appropriate serial driver version |
| * number, and identifies which options were configured into this |
| * driver. |
| */ |
| static char serial_options[] __initdata = |
| " no serial options enabled\n"; |
| #undef SERIAL_OPT |
| |
| static _INLINE_ void show_serial_version(void) |
| { |
| printk(KERN_INFO "%s version %s%s (%s) with%s", serial_name, |
| serial_version, LOCAL_VERSTRING, serial_revdate, |
| serial_options); |
| } |
| |
| |
| /* |
| * This routine is called by rs_init() to initialize a specific serial |
| * port. It determines what type of UART chip this serial port is |
| * using: 8250, 16450, 16550, 16550A. The important question is |
| * whether or not this UART is a 16550A or not, since this will |
| * determine whether or not we can use its FIFO features or not. |
| */ |
| static void autoconfig(struct serial_state * state) |
| { |
| struct async_struct *info, scr_info; |
| unsigned long flags; |
| |
| |
| #ifdef SERIAL_DEBUG_AUTOCONF |
| printk("Testing ttyS%d (0x%04lx, 0x%04x)...\n", state->line, |
| state->port, (unsigned) state->iomem_base); |
| #endif |
| |
| if (!CONFIGURED_SERIAL_PORT(state)) |
| return; |
| |
| if (au_readl(UART_MOD_CNTRL + state->port) != 0x3) { |
| au_writel(3, UART_MOD_CNTRL + state->port); |
| au_sync_delay(10); |
| } |
| |
| state->type = PORT_16550; |
| info = &scr_info; /* This is just for serial_{in,out} */ |
| |
| info->magic = SERIAL_MAGIC; |
| info->state = state; |
| info->port = state->port; |
| info->flags = state->flags; |
| info->io_type = state->io_type; |
| info->iomem_base = state->iomem_base; |
| info->iomem_reg_shift = state->iomem_reg_shift; |
| |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| 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); |
| spin_unlock_irqrestore(&serial_lock, flags); |
| } |
| |
| int register_serial(struct serial_struct *req); |
| void unregister_serial(int line); |
| |
| /* |
| * 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_AU1X00_SERIAL_CONSOLE |
| /* |
| * The interrupt of the serial console port |
| * can't be shared. |
| */ |
| if (sercons.flags & CON_CONSDEV) { |
| for(i = 0; i < NR_PORTS; i++) |
| if (i != sercons.index && |
| rs_table[i].irq == rs_table[sercons.index].irq) |
| rs_table[i].irq = 0; |
| } |
| #endif |
| show_serial_version(); |
| |
| /* Initialize the tty_driver structure */ |
| |
| memset(&serial_driver, 0, sizeof(struct tty_driver)); |
| serial_driver.magic = TTY_DRIVER_MAGIC; |
| serial_driver.driver_name = "serial"; |
| #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) |
| serial_driver.name = "tts/%d"; |
| #else |
| serial_driver.name = "ttyS"; |
| #endif |
| serial_driver.major = TTY_MAJOR; |
| serial_driver.minor_start = 64 + SERIAL_DEV_OFFSET; |
| serial_driver.num = NR_PORTS; |
| serial_driver.type = TTY_DRIVER_TYPE_SERIAL; |
| serial_driver.subtype = SERIAL_TYPE_NORMAL; |
| serial_driver.init_termios = tty_std_termios; |
| serial_driver.init_termios.c_cflag = |
| B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS; |
| serial_driver.refcount = &serial_refcount; |
| serial_driver.table = serial_table; |
| serial_driver.termios = serial_termios; |
| serial_driver.termios_locked = serial_termios_locked; |
| |
| serial_driver.open = rs_open; |
| serial_driver.close = rs_close; |
| serial_driver.write = rs_write; |
| serial_driver.put_char = rs_put_char; |
| serial_driver.flush_chars = rs_flush_chars; |
| serial_driver.write_room = rs_write_room; |
| serial_driver.chars_in_buffer = rs_chars_in_buffer; |
| serial_driver.flush_buffer = rs_flush_buffer; |
| serial_driver.ioctl = rs_ioctl; |
| serial_driver.throttle = rs_throttle; |
| serial_driver.unthrottle = rs_unthrottle; |
| serial_driver.set_termios = rs_set_termios; |
| serial_driver.stop = rs_stop; |
| serial_driver.start = rs_start; |
| serial_driver.hangup = rs_hangup; |
| serial_driver.break_ctl = rs_break; |
| serial_driver.send_xchar = rs_send_xchar; |
| serial_driver.wait_until_sent = rs_wait_until_sent; |
| serial_driver.read_proc = rs_read_proc; |
| |
| /* |
| * The callout device is just like normal device except for |
| * major number and the subtype code. |
| */ |
| callout_driver = serial_driver; |
| #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) |
| callout_driver.name = "cua/%d"; |
| #else |
| callout_driver.name = "cua"; |
| #endif |
| callout_driver.major = TTYAUX_MAJOR; |
| callout_driver.subtype = SERIAL_TYPE_CALLOUT; |
| callout_driver.read_proc = 0; |
| callout_driver.proc_entry = 0; |
| |
| if (tty_register_driver(&serial_driver)) |
| panic("Couldn't register serial driver"); |
| if (tty_register_driver(&callout_driver)) |
| panic("Couldn't register callout driver"); |
| |
| for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { |
| state->baud_base = get_au1x00_uart_baud_base(); |
| state->magic = SSTATE_MAGIC; |
| state->line = i; |
| state->type = PORT_UNKNOWN; |
| state->custom_divisor = 0; |
| state->close_delay = 5*HZ/10; |
| state->closing_wait = 30*HZ; |
| state->callout_termios = callout_driver.init_termios; |
| state->normal_termios = serial_driver.init_termios; |
| state->icount.cts = state->icount.dsr = |
| state->icount.rng = state->icount.dcd = 0; |
| state->icount.rx = state->icount.tx = 0; |
| state->icount.frame = state->icount.parity = 0; |
| state->icount.overrun = state->icount.brk = 0; |
| state->irq = irq_cannonicalize(state->irq); |
| if (state->hub6) |
| state->io_type = SERIAL_IO_HUB6; |
| if (state->port && check_region(state->port,8)) { |
| continue; |
| } |
| |
| if (state->flags & ASYNC_BOOT_AUTOCONF) { |
| autoconfig(state); |
| } |
| } |
| for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { |
| if (state->type == PORT_UNKNOWN) { |
| continue; |
| } |
| printk(KERN_INFO "ttyS%02d%s at 0x%04lx (irq = %d) is a %s\n", |
| state->line + SERIAL_DEV_OFFSET, |
| (state->flags & ASYNC_FOURPORT) ? " FourPort" : "", |
| state->port, state->irq, |
| uart_config[state->type].name); |
| tty_register_devfs(&serial_driver, 0, |
| serial_driver.minor_start + state->line); |
| tty_register_devfs(&callout_driver, 0, |
| callout_driver.minor_start + state->line); |
| } |
| return 0; |
| } |
| |
| /* |
| * register_serial and unregister_serial allows for 16x50 serial ports to be |
| * configured at run-time, to support PCMCIA modems. |
| */ |
| |
| /** |
| * register_serial - configure a 16x50 serial port at runtime |
| * @req: request structure |
| * |
| * Configure the serial port specified by the request. If the |
| * port exists and is in use an error is returned. If the port |
| * is not currently in the table it is added. |
| * |
| * The port is then probed and if neccessary the IRQ is autodetected |
| * If this fails an error is returned. |
| * |
| * On success the port is ready to use and the line number is returned. |
| */ |
| |
| int register_serial(struct serial_struct *req) |
| { |
| int i; |
| unsigned long flags; |
| struct serial_state *state; |
| struct async_struct *info; |
| unsigned long port; |
| |
| port = req->port; |
| if (HIGH_BITS_OFFSET) |
| port += (unsigned long) req->port_high << HIGH_BITS_OFFSET; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| 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) { |
| spin_unlock_irqrestore(&serial_lock, flags); |
| return -1; |
| } |
| state = &rs_table[i]; |
| if (rs_table[i].count) { |
| spin_unlock_irqrestore(&serial_lock, 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) { |
| spin_unlock_irqrestore(&serial_lock, flags); |
| printk("register_serial(): autoconfig failed\n"); |
| return -1; |
| } |
| spin_unlock_irqrestore(&serial_lock, 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]; |
| |
| spin_lock_irqsave(&serial_lock, flags); |
| 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); |
| spin_unlock_irqrestore(&serial_lock, 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); |
| spin_lock_irqsave(&serial_lock, flags); |
| 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); |
| spin_unlock_irqrestore(&serial_lock, 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("Au1x00 serial driver"); |
| |
| |
| /* |
| * ------------------------------------------------------------ |
| * Serial console driver |
| * ------------------------------------------------------------ |
| */ |
| #ifdef CONFIG_AU1X00_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_au1x00_uart_baud_base(); |
| quot = state->baud_base / baud; |
| |
| cval = cflag & (CSIZE | CSTOPB); |
| cval >>= 4; |
| if (cflag & PARENB) |
| cval |= UART_LCR_PARITY; |
| if (!(cflag & PARODD)) |
| cval |= UART_LCR_EPAR; |
| |
| /* |
| * Disable UART interrupts, set DTR and RTS high |
| * and set speed. |
| */ |
| serial_out(info, UART_CLK, quot & 0xffff); |
| serial_out(info, UART_IER, 0); |
| serial_out(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS); |
| |
| /* |
| * If we read 0xff from the LSR, there is no UART here. |
| */ |
| if (serial_in(info, UART_LSR) == 0xff) |
| return -1; |
| |
| return 0; |
| } |
| |
| static struct console sercons = { |
| .name = "ttyS", |
| .write = serial_console_write, |
| .device = serial_console_device, |
| .setup = serial_console_setup, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| }; |
| |
| /* |
| * Register console. |
| */ |
| void __init au1x00_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: |
| */ |