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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [au1x00-serial.c] - Rev 1275
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/* * * 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 (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->closing_wait); /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ info->IER &= ~UART_IER_RLSI; info->read_status_mask &= ~UART_LSR_DR; if (info->flags & ASYNC_INITIALIZED) { serial_out(info, UART_IER, info->IER); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ rs_wait_until_sent(tty, info->timeout); } shutdown(info); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (info->blocked_open) { if (info->close_delay) { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); MOD_DEC_USE_COUNT; } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long orig_jiffies, char_time; int lsr; if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent")) return; if (info->state->type == PORT_UNKNOWN) return; if (info->xmit_fifo_size == 0) return; /* Just in case.... */ orig_jiffies = jiffies; /* * Set the check interval to be 1/5 of the estimated time to * send a single character, and make it at least 1. The check * interval should also be less than the timeout. * * Note: we have to use pretty tight timings here to satisfy * the NIST-PCTS. */ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; char_time = char_time / 5; if (char_time == 0) char_time = 1; if (timeout && timeout < char_time) char_time = timeout; /* * If the transmitter hasn't cleared in twice the approximate * amount of time to send the entire FIFO, it probably won't * ever clear. This assumes the UART isn't doing flow * control, which is currently the case. Hence, if it ever * takes longer than info->timeout, this is probably due to a * UART bug of some kind. So, we clamp the timeout parameter at * 2*info->timeout. */ if (!timeout || timeout > 2*info->timeout) timeout = 2*info->timeout; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); printk("jiff=%lu...", jiffies); #endif while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...", lsr, jiffies); #endif set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } set_current_state(TASK_RUNNING); #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); #endif } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ static void rs_hangup(struct tty_struct *tty) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state = info->state; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; state = info->state; rs_flush_buffer(tty); if (info->flags & ASYNC_CLOSING) return; shutdown(info); info->event = 0; state->count = 0; info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct async_struct *info) { DECLARE_WAITQUEUE(wait, current); struct serial_state *state = info->state; int retval; int do_clocal = 0, extra_count = 0; unsigned long flags; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & ASYNC_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ASYNC_CALLOUT_ACTIVE; return 0; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { if (info->flags & ASYNC_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } if (info->flags & ASYNC_CALLOUT_ACTIVE) { if (state->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; } /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, state->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready before block: ttys%d, count = %d\n", state->line, state->count); #endif 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: */
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