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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [serial_txx927.c] - Rev 1774
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/* * drivers/char/serial_txx927.c * driver for TX[34]927 SIO * * Copyright 2001 MontaVista Software Inc. * Author: MontaVista Software, Inc. * ahennessy@mvista.com * * Based on drivers/char/serial.c * * Copyright (C) 2000-2001 Toshiba Corporation * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #define SERIAL_DO_RESTART /* Set of debugging defines */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT #undef SERIAL_DEBUG_PCI #undef SERIAL_DEBUG_AUTOCONF #ifdef MODULE #undef CONFIG_TXX927_SERIAL_CONSOLE #endif #define CONFIG_SERIAL_RSA #define RS_STROBE_TIME (10*HZ) #define RS_ISR_PASS_LIMIT 256 /* * End of serial driver configuration section. */ #include <linux/module.h> #include <linux/config.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial.h> #include <linux/circ_buf.h> #include <linux/serial_reg.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/ptrace.h> #include <linux/ioport.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/serialP.h> #include <linux/delay.h> #ifdef CONFIG_TXX927_SERIAL_CONSOLE #include <linux/console.h> #endif #ifdef CONFIG_MAGIC_SYSRQ #include <linux/sysrq.h> #endif #include <asm/system.h> #include <asm/serial.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> #include <asm/bitops.h> #include <asm/jmr3927/txx927.h> #include <asm/bootinfo.h> #ifdef CONFIG_TOSHIBA_JMR3927 #include <asm/jmr3927/jmr3927.h> #endif #define _INLINE_ inline #ifdef CONFIG_MAC_SERIAL #define SERIAL_DEV_OFFSET 2 #else #define SERIAL_DEV_OFFSET 0 #endif static char *serial_name = "TXx927 Serial driver"; static char *serial_version = "0.02"; static DECLARE_TASK_QUEUE(tq_serial); static struct tty_driver serial_driver, callout_driver; static int serial_refcount; static struct timer_list serial_timer; extern unsigned long get_txx927_uart_baud(void); /* serial subtype definitions */ #ifndef SERIAL_TYPE_NORMAL #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 #endif /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* * IRQ_timeout - How long the timeout should be for each IRQ * should be after the IRQ has been active. */ static struct async_struct *IRQ_ports[NR_IRQS]; static int IRQ_timeout[NR_IRQS]; #ifdef CONFIG_TXX927_SERIAL_CONSOLE static struct console sercons; #endif #if defined(CONFIG_TXX927_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) static unsigned long break_pressed; /* break, really ... */ #endif static void change_speed(struct async_struct *info, struct termios *old); static void rs_wait_until_sent(struct tty_struct *tty, int timeout); #ifndef PREPARE_FUNC #define PREPARE_FUNC(dev) (dev->prepare) #define ACTIVATE_FUNC(dev) (dev->activate) #define DEACTIVATE_FUNC(dev) (dev->deactivate) #endif #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s) #else #define DBG_CNT(s) #endif #define SERIAL_DRIVER_NAME "TXx927SIO" #ifdef CONFIG_SERIAL /* "ttyS","cua" is used for standard serial driver */ #define TXX927_TTY_NAME "ttySC" #define TXX927_TTY_MINOR_START (64 + 16) /* ttySC0(80), ttySC1(81) */ #define TXX927_CU_NAME "cuac" #define TXX927_SERIAL_BH TXX927SERIAL_BH #else /* acts like standard serial driver */ #define TXX927_TTY_NAME "ttyS" #define TXX927_TTY_MINOR_START 64 #define TXX927_CU_NAME "cua" #define TXX927_SERIAL_BH SERIAL_BH #endif #define TXX927_TTY_MAJOR TTY_MAJOR #define TXX927_TTYAUX_MAJOR TTYAUX_MAJOR #define ASYNC_HAVE_CTS_LINE ASYNC_BOOT_AUTOCONF /* reuse */ static struct serial_state rs_table[RS_TABLE_SIZE] = { SERIAL_PORT_DFNS /* Defined in serial.h */ }; #define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state)) static struct tty_struct *serial_table[NR_PORTS]; static struct termios *serial_termios[NR_PORTS]; static struct termios *serial_termios_locked[NR_PORTS]; #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /* * tmp_buf is used as a temporary buffer by serial_write. We need to * lock it in case the copy_from_user blocks while swapping in a page, * and some other program tries to do a serial write at the same time. * Since the lock will only come under contention when the system is * swapping and available memory is low, it makes sense to share one * buffer across all the serial ports, since it significantly saves * memory if large numbers of serial ports are open. */ static unsigned char *tmp_buf; #ifdef DECLARE_MUTEX static DECLARE_MUTEX(tmp_buf_sem); #else static struct semaphore tmp_buf_sem = MUTEX; #endif static inline int serial_paranoia_check(struct async_struct *info, kdev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for serial struct (%s) in %s\n"; static const char *badinfo = "Warning: null async_struct for (%s) in %s\n"; if (!info) { printk(badinfo, kdevname(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, kdevname(device), routine); return 1; } #endif return 0; } static inline struct txx927_sio_reg *sio_reg(struct async_struct *info) { return (struct txx927_sio_reg *)info->port; } /* * Wait for transmitter & holding register to empty */ static inline void wait_for_xmitr(struct async_struct *info) { unsigned int tmout = 1000000; do { if (--tmout == 0) break; } while (!(sio_reg(info)->cisr & TXx927_SICISR_TXALS)); } /* * ------------------------------------------------------------ * rs_stop() and rs_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. * ------------------------------------------------------------ */ static void rs_stop(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_stop")) return; save_flags(flags); cli(); if (info->IER & UART_IER_THRI) { info->IER &= ~UART_IER_THRI; sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE; } restore_flags(flags); } static void rs_start(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_start")) return; save_flags(flags); cli(); if (info->xmit.head != info->xmit.tail && info->xmit.buf && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; sio_reg(info)->dicr |= TXx927_SIDICR_TIE; } restore_flags(flags); } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * rs_interrupt(). They were separated out for readability's sake. * * Note: rs_interrupt() is a "fast" interrupt, which means that it * runs with interrupts turned off. People who may want to modify * rs_interrupt() should try to keep the interrupt handler as fast as * possible. After you are done making modifications, it is not a bad * idea to do: * * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c * * and look at the resulting assemble code in serial.s. * * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 * ----------------------------------------------------------------------- */ /* * This routine is used by the interrupt handler to schedule * processing in the software interrupt portion of the driver. */ static _INLINE_ void rs_sched_event(struct async_struct *info, int event) { info->event |= 1 << event; queue_task(&info->tqueue, &tq_serial); mark_bh(TXX927_SERIAL_BH); } static _INLINE_ void receive_chars(struct async_struct *info, int *status) { struct tty_struct *tty = info->tty; unsigned char ch; int ignored = 0; struct async_icount *icount; icount = &info->state->icount; do { ch = sio_reg(info)->rfifo; if (tty->flip.count >= TTY_FLIPBUF_SIZE) break; *tty->flip.char_buf_ptr = ch; icount->rx++; #ifdef SERIAL_DEBUG_INTR printk("DR%02x:%02x...", ch, *status); #endif *tty->flip.flag_buf_ptr = 0; if (*status & (TXx927_SIDISR_UBRK | TXx927_SIDISR_UPER | TXx927_SIDISR_UFER | TXx927_SIDISR_UOER)) { /* * For statistics only */ if (*status & TXx927_SIDISR_UBRK) { *status &= ~(TXx927_SIDISR_UFER | TXx927_SIDISR_UPER); icount->brk++; } else if (*status & TXx927_SIDISR_UPER) icount->parity++; else if (*status & TXx927_SIDISR_UFER) icount->frame++; if (*status & TXx927_SIDISR_UOER) icount->overrun++; /* * Now check to see if character should be * ignored, and mask off conditions which * should be ignored. */ if (*status & info->ignore_status_mask) { if (++ignored > 100) break; goto ignore_char; } *status &= info->read_status_mask; if (*status & (TXx927_SIDISR_UBRK)) { #ifdef SERIAL_DEBUG_INTR printk("handling break...."); #endif *tty->flip.flag_buf_ptr = TTY_BREAK; if (info->flags & ASYNC_SAK) do_SAK(tty); } else if (*status & TXx927_SIDISR_UPER) *tty->flip.flag_buf_ptr = TTY_PARITY; else if (*status & TXx927_SIDISR_UFER) *tty->flip.flag_buf_ptr = TTY_FRAME; if (*status & TXx927_SIDISR_UOER) { /* * Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ if (tty->flip.count < TTY_FLIPBUF_SIZE) { tty->flip.count++; tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; *tty->flip.flag_buf_ptr = TTY_OVERRUN; } } } tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; tty->flip.count++; ignore_char: *status = sio_reg(info)->disr; } while (!(*status & TXx927_SIDISR_UVALID)); tty_flip_buffer_push(tty); } static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done) { int count; wait_for_xmitr(info); if (info->x_char) { sio_reg(info)->tfifo = info->x_char; info->state->icount.tx++; info->x_char = 0; if (intr_done) *intr_done = 0; return; } if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) { sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE; return; } count = info->xmit_fifo_size; do { sio_reg(info)->tfifo = info->xmit.buf[info->xmit.tail++]; info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); info->state->icount.tx++; if (info->xmit.head == info->xmit.tail) break; } while (--count > 0); if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) < WAKEUP_CHARS) rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); #ifdef SERIAL_DEBUG_INTR printk("THRE..."); #endif if (intr_done) *intr_done = 0; if (info->xmit.head == info->xmit.tail) { sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE; } } static _INLINE_ void check_modem_status(struct async_struct *info) { /* RTS/CTS are controled by HW. (if possible) */ } /* * This is the serial driver's interrupt routine for a single port */ static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs) { int status; int pass_counter = 0; struct async_struct * info; #ifdef SERIAL_DEBUG_INTR printk("rs_interrupt_single(%d)...", irq); #endif info = IRQ_ports[irq]; if (!info || !info->tty) return; do { status = sio_reg(info)->disr; #ifdef SERIAL_DEBUG_INTR printk("status = %x...", status); #endif if (!(sio_reg(info)->dicr & TXx927_SIDICR_TIE)) status &= ~TXx927_SIDISR_TDIS; if (!(status & (TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT))) break; if (status & TXx927_SIDISR_RDIS) receive_chars(info, &status); check_modem_status(info); if (status & TXx927_SIDISR_TDIS) transmit_chars(info, 0); /* Clear TX/RX Int. Status */ sio_reg(info)->disr &= ~(TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT); if (pass_counter++ > RS_ISR_PASS_LIMIT) { #ifdef SERIAL_DEBUG_INTR printk("rs_single loop break.\n"); #endif break; } } while (1); info->last_active = jiffies; #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * This routine is used to handle the "bottom half" processing for the * serial driver, known also the "software interrupt" processing. * This processing is done at the kernel interrupt level, after the * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This * is where time-consuming activities which can not be done in the * interrupt driver proper are done; the interrupt driver schedules * them using rs_sched_event(), and they get done here. */ static void do_serial_bh(void) { run_task_queue(&tq_serial); } static void do_softint(void *private_) { struct async_struct *info = (struct async_struct *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); #ifdef SERIAL_HAVE_POLL_WAIT wake_up_interruptible(&tty->poll_wait); #endif } } /* * This subroutine is called when the RS_TIMER goes off. It is used * by the serial driver to handle ports that do not have an interrupt * (irq=0). This doesn't work very well for 16450's, but gives barely * passable results for a 16550A. (Although at the expense of much * CPU overhead). */ static void rs_timer(unsigned long dummy) { static unsigned long last_strobe; struct async_struct *info; unsigned int i; unsigned long flags; if ((jiffies - last_strobe) >= RS_STROBE_TIME) { for (i=0; i < NR_IRQS; i++) { info = IRQ_ports[i]; if (!info) continue; save_flags(flags); cli(); rs_interrupt_single(i, NULL, NULL); restore_flags(flags); } } last_strobe = jiffies; mod_timer(&serial_timer, jiffies + RS_STROBE_TIME); #if 0 if (IRQ_ports[0]) { save_flags(flags); cli(); rs_interrupt_single(0, NULL, NULL); restore_flags(flags); mod_timer(&serial_timer, jiffies + IRQ_timeout[0]); } #endif } /* * --------------------------------------------------------------- * Low level utility subroutines for the serial driver: routines to * figure out the appropriate timeout for an interrupt chain, routines * to initialize and startup a serial port, and routines to shutdown a * serial port. Useful stuff like that. * --------------------------------------------------------------- */ /* * This routine figures out the correct timeout for a particular IRQ. * It uses the smallest timeout of all of the serial ports in a * particular interrupt chain. Now only used for IRQ 0.... */ static void figure_IRQ_timeout(int irq) { struct async_struct *info; int timeout = 60*HZ; /* 60 seconds === a long time :-) */ info = IRQ_ports[irq]; if (!info) { IRQ_timeout[irq] = 60*HZ; return; } while (info) { if (info->timeout < timeout) timeout = info->timeout; info = info->next_port; } if (!irq) timeout = timeout / 2; IRQ_timeout[irq] = timeout ? timeout : 1; } static int startup(struct async_struct * info) { unsigned long flags; int retval=0; struct serial_state *state= info->state; unsigned long page; page = get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; save_flags(flags); cli(); if (info->flags & ASYNC_INITIALIZED) { free_page(page); goto errout; } if (!state->port) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); free_page(page); goto errout; } if (info->xmit.buf) free_page(page); else info->xmit.buf = (unsigned char *) page; #ifdef SERIAL_DEBUG_OPEN printk("starting up ttys%d (irq %d)...", info->line, state->irq); #endif /* * Clear the FIFO buffers and disable them * (they will be reenabled in change_speed()) */ sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST | TXx927_SIFCR_FRSTE; /* clear reset */ sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST | TXx927_SIFCR_FRSTE); /* * Allocate the IRQ if necessary */ if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { if (IRQ_ports[state->irq]) { retval = -EBUSY; goto errout; } retval = request_irq(state->irq, rs_interrupt_single, SA_INTERRUPT, "txx927serial", NULL); if (retval) { if (capable(CAP_SYS_ADMIN)) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); retval = 0; } goto errout; } } /* * Insert serial port into IRQ chain. */ info->prev_port = 0; info->next_port = IRQ_ports[state->irq]; if (info->next_port) info->next_port->prev_port = info; IRQ_ports[state->irq] = info; figure_IRQ_timeout(state->irq); /* * Clear the interrupt registers. */ sio_reg(info)->disr = 0; /* * Now, initialize the UART */ /* HW RTS/CTS control */ if (state->flags & ASYNC_HAVE_CTS_LINE) sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RTSTL_MAX /* 15 */; /* Enable RX/TX */ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE); /* * Finally, enable interrupts */ sio_reg(info)->dicr = TXx927_SIDICR_RIE; if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit.head = info->xmit.tail = 0; /* * Set up the tty->alt_speed kludge */ if (info->tty) { if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) info->tty->alt_speed = 57600; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) info->tty->alt_speed = 115200; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) info->tty->alt_speed = 230400; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) info->tty->alt_speed = 460800; } /* * and set the speed of the serial port */ change_speed(info, 0); info->flags |= ASYNC_INITIALIZED; restore_flags(flags); return 0; errout: restore_flags(flags); return retval; } /* * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void shutdown(struct async_struct * info) { unsigned long flags; struct serial_state *state; int retval; if (!(info->flags & ASYNC_INITIALIZED)) return; state = info->state; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d (irq %d)....", info->line, state->irq); #endif save_flags(flags); cli(); /* Disable interrupts */ /* * First unlink the serial port from the IRQ chain... */ if (info->next_port) info->next_port->prev_port = info->prev_port; if (info->prev_port) info->prev_port->next_port = info->next_port; else IRQ_ports[state->irq] = info->next_port; figure_IRQ_timeout(state->irq); /* * Free the IRQ, if necessary */ if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { if (IRQ_ports[state->irq]) { free_irq(state->irq, NULL); retval = request_irq(state->irq, rs_interrupt_single, SA_INTERRUPT, "txx927serial", NULL); if (retval) printk(KERN_WARNING "txx927serial shutdown: request_irq: error %d" " Couldn't reacquire IRQ.\n", retval); } else free_irq(state->irq, NULL); } if (info->xmit.buf) { free_page((unsigned long) info->xmit.buf); info->xmit.buf = 0; } sio_reg(info)->dicr = 0; /* disable all intrs */ /* disable break condition */ sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK; if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) { /* drop RTS */ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE; /* TXx927-SIO can not control DTR... */ } /* reset FIFO's */ sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST | TXx927_SIFCR_FRSTE; /* clear reset */ sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST | TXx927_SIFCR_FRSTE); /* DON'T disable Rx/Tx here, ie. DON'T set either * TXx927_SIFLCR_RSDE or TXx927_SIFLCR_TSDE in flcr */ if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); info->flags &= ~ASYNC_INITIALIZED; restore_flags(flags); } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static void change_speed(struct async_struct *info, struct termios *old_termios) { int quot = 0, baud_base, baud; unsigned cflag, cval; int bits; unsigned long flags; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; if (!info->port) return; cval = sio_reg(info)->lcr; /* byte size and parity */ cval &= ~TXx927_SILCR_UMODE_MASK; switch (cflag & CSIZE) { case CS7: cval |= TXx927_SILCR_UMODE_7BIT; bits = 9; break; case CS5: /* not supported */ case CS6: /* not supported */ case CS8: default: cval |= TXx927_SILCR_UMODE_8BIT; bits = 10; break; } cval &= ~TXx927_SILCR_USBL_MASK; if (cflag & CSTOPB) { cval |= TXx927_SILCR_USBL_2BIT; bits++; } else { cval |= TXx927_SILCR_USBL_1BIT; } cval &= ~(TXx927_SILCR_UPEN|TXx927_SILCR_UEPS); if (cflag & PARENB) { cval |= TXx927_SILCR_UPEN; bits++; } if (!(cflag & PARODD)) cval |= TXx927_SILCR_UEPS; /* Determine divisor based on baud rate */ baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; /* B0 transition handled in rs_set_termios */ baud_base = info->state->baud_base; quot = (baud_base + baud / 2) / baud; /* If the quotient is zero refuse the change */ if (!quot && old_termios) { info->tty->termios->c_cflag &= ~CBAUD; info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; quot = (baud_base + baud / 2) / baud; } /* As a last resort, if the quotient is zero, default to 9600 bps */ if (!quot) quot = (baud_base + 9600 / 2) / 9600; info->quot = quot; info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); info->timeout += HZ/50; /* Add .02 seconds of slop */ /* CTS flow control flag */ if (cflag & CRTSCTS) { info->flags |= ASYNC_CTS_FLOW; if (info->state->flags & ASYNC_HAVE_CTS_LINE) sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RTSTL_MAX /* 15 */; } else { info->flags &= ~ASYNC_CTS_FLOW; sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE); } /* * Set up parity check flag */ #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) info->read_status_mask = TXx927_SIDISR_UOER | TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS; if (I_INPCK(info->tty)) info->read_status_mask |= TXx927_SIDISR_UFER | TXx927_SIDISR_UPER; if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) info->read_status_mask |= TXx927_SIDISR_UBRK; /* * Characters to ignore */ info->ignore_status_mask = 0; if (I_IGNPAR(info->tty)) info->ignore_status_mask |= TXx927_SIDISR_UPER | TXx927_SIDISR_UFER; if (I_IGNBRK(info->tty)) { info->ignore_status_mask |= TXx927_SIDISR_UBRK; /* * If we're ignore parity and break indicators, ignore * overruns too. (For real raw support). */ if (I_IGNPAR(info->tty)) info->ignore_status_mask |= TXx927_SIDISR_UOER; } /* * !!! ignore all characters if CREAD is not set */ if ((cflag & CREAD) == 0) info->ignore_status_mask |= TXx927_SIDISR_RDIS; save_flags(flags); cli(); sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG; sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0; restore_flags(flags); } static void rs_put_char(struct tty_struct *tty, unsigned char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_put_char")) return; if (!tty || !info->xmit.buf) return; save_flags(flags); cli(); if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) { restore_flags(flags); return; } info->xmit.buf[info->xmit.head++] = ch; info->xmit.head &= SERIAL_XMIT_SIZE-1; restore_flags(flags); } static void rs_flush_chars(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_chars")) return; if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped || !info->xmit.buf) return; save_flags(flags); cli(); sio_reg(info)->dicr |= TXx927_SIDICR_TIE; restore_flags(flags); } static int rs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, ret = 0; struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_write")) return 0; if (!tty || !info->xmit.buf || !tmp_buf) return 0; save_flags(flags); if (from_user) { down(&tmp_buf_sem); while (1) { int c1; c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (count < c) c = count; if (c <= 0) break; c -= copy_from_user(tmp_buf, buf, c); if (!c) { if (!ret) ret = -EFAULT; break; } cli(); c1 = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (c1 < c) c = c1; memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c); info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1)); restore_flags(flags); buf += c; count -= c; ret += c; } up(&tmp_buf_sem); } else { cli(); while (1) { c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (count < c) c = count; if (c <= 0) { break; } memcpy(info->xmit.buf + info->xmit.head, buf, c); info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1)); buf += c; count -= c; ret += c; } restore_flags(flags); } if (info->xmit.head != info->xmit.tail && !tty->stopped && !tty->hw_stopped && !(info->IER & UART_IER_THRI)) sio_reg(info)->dicr |= TXx927_SIDICR_TIE; return ret; } static int rs_write_room(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_write_room")) return 0; return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); } static int rs_chars_in_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer")) return 0; return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); } static void rs_flush_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_buffer")) return; save_flags(flags); cli(); info->xmit.head = info->xmit.tail = 0; restore_flags(flags); wake_up_interruptible(&tty->write_wait); #ifdef SERIAL_HAVE_POLL_WAIT wake_up_interruptible(&tty->poll_wait); #endif if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * This function is used to send a high-priority XON/XOFF character to * the device */ static void rs_send_xchar(struct tty_struct *tty, char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_send_char")) return; info->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ sio_reg(info)->dicr |= TXx927_SIDICR_TIE; } } /* * ------------------------------------------------------------ * rs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void rs_throttle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("throttle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_throttle")) return; if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); if (tty->termios->c_cflag & CRTSCTS) { save_flags(flags); cli(); /* drop RTS */ sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE; restore_flags(flags); } } static void rs_unthrottle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("unthrottle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else rs_send_xchar(tty, START_CHAR(tty)); } if (tty->termios->c_cflag & CRTSCTS) { save_flags(flags); cli(); sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE); restore_flags(flags); } } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_modem_info(struct async_struct * info, unsigned int *value) { unsigned int result; unsigned long flags; save_flags(flags); cli(); result = ((sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC) ? 0 : TIOCM_RTS) | ((sio_reg(info)->cisr & TXx927_SICISR_CTSS) ? 0 : TIOCM_CTS); restore_flags(flags); return put_user(result,value); } static int set_modem_info(struct async_struct * info, unsigned int cmd, unsigned int *value) { int error; unsigned int arg; unsigned long flags; error = get_user(arg, value); if (error) return error; save_flags(flags); cli(); switch (cmd) { case TIOCMBIS: if (arg & TIOCM_RTS) sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE); break; case TIOCMBIC: if (arg & TIOCM_RTS) sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE; break; case TIOCMSET: sio_reg(info)->flcr = (sio_reg(info)->flcr & ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE)) | ((arg & TIOCM_RTS) ? 0 : TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE); break; default: error = -EINVAL; } restore_flags(flags); return error; } /* * rs_break() --- routine which turns the break handling on or off */ static void rs_break(struct tty_struct *tty, int break_state) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_break")) return; if (!info->port) return; save_flags(flags); cli(); if (break_state == -1) sio_reg(info)->flcr |= TXx927_SIFLCR_TBRK; else sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK; restore_flags(flags); } static int rs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { struct async_struct * info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } switch (cmd) { case TIOCMGET: return get_modem_info(info, (unsigned int *) arg); case TIOCMBIS: case TIOCMBIC: case TIOCMSET: return set_modem_info(info, cmd, (unsigned int *) arg); return 0; case TIOCGSERIAL: printk("TIOCGSERIAL\n"); return 0; case TIOCSSERIAL: printk("TIOCSSERIAL\n"); return 0; case TIOCSERCONFIG: printk("TIOCSERCONFIG\n"); return 0; case TIOCSERGETLSR: /* Get line status register */ printk("TIOCSERGETLSR\n"); return 0; case TIOCSERGSTRUCT: printk("TIOCSERGSTRUCT\n"); return 0; /* * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change * - mask passed in arg for lines of interest * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) * Caller should use TIOCGICOUNT to see which one it was */ case TIOCMIWAIT: printk("TIOCMIWAIT\n"); return 0; /* * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) * Return: write counters to the user passed counter struct * NB: both 1->0 and 0->1 transitions are counted except for * RI where only 0->1 is counted. */ case TIOCGICOUNT: printk("TIOCGICOUNT\n"); return 0; case TIOCSERGWILD: case TIOCSERSWILD: /* "setserial -W" is called in Debian boot */ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); return 0; default: return -ENOIOCTLCMD; } return 0; } static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; unsigned int cflag = tty->termios->c_cflag; if ( (cflag == old_termios->c_cflag) && ( RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) return; change_speed(info, old_termios); /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { save_flags(flags); cli(); sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE; restore_flags(flags); } /* Handle transition away from B0 status */ if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { if (!(tty->termios->c_cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) { save_flags(flags); cli(); sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE); restore_flags(flags); } } /* Handle turning off CRTSCTS */ if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; rs_start(tty); } } /* * ------------------------------------------------------------ * rs_close() * * This routine is called when the serial port gets closed. First, we * wait for the last remaining data to be sent. Then, we unlink its * async structure from the interrupt chain if necessary, and we free * that IRQ if nothing is left in the chain. * ------------------------------------------------------------ */ static void rs_close(struct tty_struct *tty, struct file * filp) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "rs_close")) return; state = info->state; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { restore_flags(flags); return; } #ifdef SERIAL_DEBUG_OPEN printk("rs_close ttys%d, count = %d\n", info->line, state->count); #endif if ((tty->count == 1) && (state->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. state->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk(KERN_WARNING "rs_close: bad serial port count; tty->count is 1, " "state->count is %d\n", state->count); state->count = 1; } if (--state->count < 0) { printk(KERN_WARNING "rs_close: bad serial port count for ttys%d: %d\n", info->line, state->count); state->count = 0; } if (state->count) { restore_flags(flags); return; } info->flags |= ASYNC_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ASYNC_NORMAL_ACTIVE) info->state->normal_termios = *tty->termios; if (info->flags & ASYNC_CALLOUT_ACTIVE) info->state->callout_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->closing_wait); /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ info->read_status_mask &= ~TXx927_SIDISR_RDIS; if (info->flags & ASYNC_INITIALIZED) { #if 0 sio_reg(info)->dicr &= ~TXx927_SIDICR_RIE; #endif /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ rs_wait_until_sent(tty, info->timeout); } shutdown(info); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); restore_flags(flags); } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long orig_jiffies, char_time; int cisr; if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent")) return; if (info->xmit_fifo_size == 0) return; /* Just in case.... */ orig_jiffies = jiffies; /* * Set the check interval to be 1/5 of the estimated time to * send a single character, and make it at least 1. The check * interval should also be less than the timeout. * * Note: we have to use pretty tight timings here to satisfy * the NIST-PCTS. */ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; char_time = char_time / 5; if (char_time == 0) char_time = 1; if (timeout) char_time = MIN(char_time, timeout); /* * If the transmitter hasn't cleared in twice the approximate * amount of time to send the entire FIFO, it probably won't * ever clear. This assumes the UART isn't doing flow * control, which is currently the case. Hence, if it ever * takes longer than info->timeout, this is probably due to a * UART bug of some kind. So, we clamp the timeout parameter at * 2*info->timeout. */ if (!timeout || timeout > 2*info->timeout) timeout = 2*info->timeout; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); printk("jiff=%lu...", jiffies); #endif while (!((cisr = sio_reg(info)->cisr) & TXx927_SICISR_TXALS)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("cisr = %d (jiff=%lu)...", cisr, jiffies); #endif current->state = TASK_INTERRUPTIBLE; current->counter = 0; /* make us low-priority */ schedule_timeout(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } current->state = TASK_RUNNING; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("cisr = %d (jiff=%lu)...done\n", cisr, jiffies); #endif } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ static void rs_hangup(struct tty_struct *tty) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state = info->state; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; state = info->state; rs_flush_buffer(tty); shutdown(info); info->event = 0; state->count = 0; info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct async_struct *info) { DECLARE_WAITQUEUE(wait, current); struct serial_state *state = info->state; int retval; int do_clocal = 0, extra_count = 0; unsigned long flags; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & ASYNC_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ASYNC_CALLOUT_ACTIVE; return 0; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { if (info->flags & ASYNC_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } if (info->flags & ASYNC_CALLOUT_ACTIVE) { if (state->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; } /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, state->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready before block: ttys%d, count = %d\n", state->line, state->count); #endif save_flags(flags); cli(); if (!tty_hung_up_p(filp)) { extra_count = 1; state->count--; } restore_flags(flags); info->blocked_open++; while (1) { save_flags(flags); cli(); if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && (tty->termios->c_cflag & CBAUD)) sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE); restore_flags(flags); current->state = TASK_INTERRUPTIBLE; if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) { #ifdef SERIAL_DO_RESTART if (info->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && !(info->flags & ASYNC_CLOSING)) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready blocking: ttys%d, count = %d\n", info->line, state->count); #endif schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (extra_count) state->count++; info->blocked_open--; #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready after blocking: ttys%d, count = %d\n", info->line, state->count); #endif if (retval) return retval; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } static int get_async_struct(int line, struct async_struct **ret_info) { struct async_struct *info; struct serial_state *sstate; #ifdef REMOTE_DEBUG if (kdb_port_info.state && line == kdb_port_info.line) return -ENODEV; #endif sstate = rs_table + line; sstate->count++; if (sstate->info) { *ret_info = sstate->info; return 0; } info = kmalloc(sizeof(struct async_struct), GFP_KERNEL); if (!info) { sstate->count--; return -ENOMEM; } memset(info, 0, sizeof(struct async_struct)); init_waitqueue_head(&info->open_wait); init_waitqueue_head(&info->close_wait); init_waitqueue_head(&info->delta_msr_wait); info->magic = SERIAL_MAGIC; info->port = sstate->port; info->flags = sstate->flags; info->io_type = sstate->io_type; info->xmit_fifo_size = sstate->xmit_fifo_size; info->line = line; info->tqueue.routine = do_softint; info->tqueue.data = info; info->state = sstate; if (sstate->info) { kfree(info); *ret_info = sstate->info; return 0; } *ret_info = sstate->info = info; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its async structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int rs_open(struct tty_struct *tty, struct file * filp) { struct async_struct *info; int retval, line; unsigned long page; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= NR_PORTS)) { return -ENODEV; } retval = get_async_struct(line, &info); if (retval) { return retval; } tty->driver_data = info; info->tty = tty; #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line, info->state->count); #endif info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; if (!tmp_buf) { page = get_free_page(GFP_KERNEL); if (!page) { return -ENOMEM; } if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * Start up serial port */ retval = startup(info); if (retval) { return retval; } retval = block_til_ready(tty, filp, info); if (retval) { #ifdef SERIAL_DEBUG_OPEN printk("rs_open returning after block_til_ready with %d\n", retval); #endif return retval; } if ((info->state->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->state->normal_termios; else *tty->termios = info->state->callout_termios; change_speed(info, 0); } #ifdef CONFIG_TXX927_SERIAL_CONSOLE if (sercons.cflag && sercons.index == line) { tty->termios->c_cflag = sercons.cflag; sercons.cflag = 0; change_speed(info, 0); } #endif info->session = current->session; info->pgrp = current->pgrp; #ifdef SERIAL_DEBUG_OPEN printk("rs_open ttys%d successful...", info->line); #endif return 0; } /* * /proc fs routines.... */ static inline int line_info(char *buf, struct serial_state *state) { struct async_struct *info = state->info, scr_info; char stat_buf[30]; int ret; unsigned long flags; ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d", state->line, SERIAL_DRIVER_NAME, state->port, state->irq); if (!state->port) { ret += sprintf(buf+ret, "\n"); return ret; } /* * Figure out the current RS-232 lines */ if (!info) { info = &scr_info; /* This is just for serial_{in,out} */ info->magic = SERIAL_MAGIC; info->port = state->port; info->flags = state->flags; info->quot = 0; info->tty = 0; } stat_buf[0] = 0; stat_buf[1] = 0; save_flags(flags); cli(); if (!(sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC)) strcat(stat_buf, "|RTS"); if (!(sio_reg(info)->cisr & TXx927_SICISR_CTSS)) strcat(stat_buf, "|CTS"); restore_flags(flags); if (info->quot) { ret += sprintf(buf+ret, " baud:%d", state->baud_base / info->quot); } ret += sprintf(buf+ret, " tx:%d rx:%d", state->icount.tx, state->icount.rx); if (state->icount.frame) ret += sprintf(buf+ret, " fe:%d", state->icount.frame); if (state->icount.parity) ret += sprintf(buf+ret, " pe:%d", state->icount.parity); if (state->icount.brk) ret += sprintf(buf+ret, " brk:%d", state->icount.brk); if (state->icount.overrun) ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); /* * Last thing is the RS-232 status lines */ ret += sprintf(buf+ret, " %s\n", stat_buf+1); return ret; } static int rs_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { int i, len = 0, l; off_t begin = 0; len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); for (i = 0; i < NR_PORTS && len < 4000; i++) { l = line_info(page + len, &rs_table[i]); len += l; if (len+begin > off+count) goto done; if (len+begin < off) { begin += len; len = 0; } } *eof = 1; done: if (off >= len+begin) return 0; *start = page + (begin-off); return ((count < begin+len-off) ? count : begin+len-off); } /* * --------------------------------------------------------------------- * rs_init() and friends * * rs_init() is called at boot-time to initialize the serial driver. * --------------------------------------------------------------------- */ /* * This routine prints out the appropriate serial driver version * number, and identifies which options were configured into this * driver. */ static _INLINE_ void show_serial_version(void) { printk(KERN_INFO "%s version %s\n", serial_name, serial_version); } /* * The serial driver boot-time initialization code! */ static int __init rs_init(void) { int i; struct serial_state * state; if (rs_table[0].port == 0) return -ENODEV; init_bh(TXX927_SERIAL_BH, do_serial_bh); init_timer(&serial_timer); serial_timer.function = rs_timer; mod_timer(&serial_timer, jiffies + RS_STROBE_TIME); for (i = 0; i < NR_IRQS; i++) { IRQ_ports[i] = 0; IRQ_timeout[i] = 0; } #ifdef CONFIG_TXX927_SERIAL_CONSOLE /* * The interrupt of the serial console port * can't be shared. */ if (sercons.flags & CON_CONSDEV) { for(i = 0; i < NR_PORTS; i++) if (i != sercons.index && rs_table[i].irq == rs_table[sercons.index].irq) rs_table[i].irq = 0; } #endif show_serial_version(); /* Initialize the tty_driver structure */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.driver_name = "txx927serial"; #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) serial_driver.name = "tts/%d"; #else serial_driver.name = "ttyS"; #endif serial_driver.major = TXX927_TTY_MAJOR; serial_driver.minor_start = TXX927_TTY_MINOR_START + SERIAL_DEV_OFFSET; serial_driver.num = NR_PORTS; serial_driver.type = TTY_DRIVER_TYPE_SERIAL; serial_driver.subtype = SERIAL_TYPE_NORMAL; serial_driver.init_termios = tty_std_termios; serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS; serial_driver.refcount = &serial_refcount; serial_driver.table = serial_table; serial_driver.termios = serial_termios; serial_driver.termios_locked = serial_termios_locked; serial_driver.open = rs_open; serial_driver.close = rs_close; serial_driver.write = rs_write; serial_driver.put_char = rs_put_char; serial_driver.flush_chars = rs_flush_chars; serial_driver.write_room = rs_write_room; serial_driver.chars_in_buffer = rs_chars_in_buffer; serial_driver.flush_buffer = rs_flush_buffer; serial_driver.ioctl = rs_ioctl; serial_driver.throttle = rs_throttle; serial_driver.unthrottle = rs_unthrottle; serial_driver.send_xchar = rs_send_xchar; serial_driver.set_termios = rs_set_termios; serial_driver.stop = rs_stop; serial_driver.start = rs_start; serial_driver.hangup = rs_hangup; serial_driver.break_ctl = rs_break; serial_driver.wait_until_sent = rs_wait_until_sent; serial_driver.read_proc = rs_read_proc; /* * The callout device is just like normal device except for * major number and the subtype code. */ callout_driver = serial_driver; #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) callout_driver.name = "cua/%d"; #else callout_driver.name = "cua"; #endif callout_driver.major = TTYAUX_MAJOR; callout_driver.subtype = SERIAL_TYPE_CALLOUT; callout_driver.read_proc = 0; callout_driver.proc_entry = 0; if (tty_register_driver(&serial_driver)){ panic("Couldn't register serial driver\n"); } if (tty_register_driver(&callout_driver)) { panic("Couldn't register callout driver\n"); } for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { state->magic = SSTATE_MAGIC; state->line = i; state->type = PORT_UNKNOWN; state->custom_divisor = 0; state->close_delay = 5*HZ/10; state->closing_wait = 30*HZ; state->callout_termios = callout_driver.init_termios; state->normal_termios = serial_driver.init_termios; state->icount.cts = state->icount.dsr = state->icount.rng = state->icount.dcd = 0; state->icount.rx = state->icount.tx = 0; state->icount.frame = state->icount.parity = 0; state->icount.overrun = state->icount.brk = 0; state->irq = irq_cannonicalize(state->irq); state->xmit_fifo_size = TXx927_SIO_TX_FIFO; if (state->hub6) state->io_type = SERIAL_IO_HUB6; if (state->port) { continue; } } for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { if (state->type == PORT_UNKNOWN) { continue; } printk(KERN_INFO "%s%02d at 0x%04lx (irq = %d) is a %s\n", TXX927_TTY_NAME, state->line, state->port, state->irq, SERIAL_DRIVER_NAME); tty_register_devfs(&serial_driver, 0, serial_driver.minor_start + state->line); tty_register_devfs(&callout_driver, 0, callout_driver.minor_start + state->line); } return 0; } static void __exit rs_fini(void) { unsigned long flags; int e1, e2; int i; struct async_struct *info; del_timer_sync(&serial_timer); save_flags(flags); cli(); remove_bh(TXX927_SERIAL_BH); if ((e1 = tty_unregister_driver(&serial_driver))) printk(KERN_WARNING "serial: failed to unregister serial driver (%d)\n", e1); if ((e2 = tty_unregister_driver(&callout_driver))) printk(KERN_WARNING "serial: failed to unregister callout driver (%d)\n", e2); restore_flags(flags); for (i = 0; i < NR_PORTS; i++) { if ((info = rs_table[i].info)) { rs_table[i].info = NULL; kfree(info); } } if (tmp_buf) { unsigned long pg = (unsigned long) tmp_buf; tmp_buf = NULL; free_page(pg); } } module_init(rs_init); module_exit(rs_fini); MODULE_DESCRIPTION("TXX927 serial driver"); /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ #ifdef CONFIG_TXX927_SERIAL_CONSOLE static struct async_struct async_sercons; /* * Print a string to the serial port trying not to disturb * any possible real use of the port... */ static void serial_console_write(struct console *co, const char *s, unsigned count) { static struct async_struct *info = &async_sercons; int ier; unsigned i; /* * First save the IER then disable the interrupts */ ier = sio_reg(info)->dicr; sio_reg(info)->dicr = 0; /* * Now, do each character */ for (i = 0; i < count; i++, s++) { wait_for_xmitr(info); /* * Send the character out. * If a LF, also do CR... */ sio_reg(info)->tfifo = *s; if (*s == 10) { wait_for_xmitr(info); sio_reg(info)->tfifo = 13; } } /* * Finally, Wait for transmitter & holding register to empty * and restore the IER */ wait_for_xmitr(info); sio_reg(info)->dicr = ier; } static kdev_t serial_console_device(struct console *c) { return MKDEV(TXX927_TTY_MAJOR, TXX927_TTY_MINOR_START + c->index); } /* * Setup initial baud/bits/parity. We do two things here: * - construct a cflag setting for the first rs_open() * - initialize the serial port * Return non-zero if we didn't find a serial port. */ static int serial_console_setup(struct console *co, char *options) { static struct async_struct *info; struct serial_state *state; unsigned cval; int baud = 9600; int bits = 8; int parity = 'n'; int cflag = CREAD | HUPCL | CLOCAL; int quot = 0; char *s; if (co->index < 0 || co->index >= NR_PORTS) { return -1; } if (options) { baud = simple_strtoul(options, NULL, 10); s = options; while(*s >= '0' && *s <= '9') s++; if (*s) parity = *s++; if (*s) bits = *s - '0'; } /* * Now construct a cflag setting. */ switch(baud) { case 1200: cflag |= B1200; break; case 2400: cflag |= B2400; break; case 4800: cflag |= B4800; break; case 19200: cflag |= B19200; break; case 38400: cflag |= B38400; break; case 57600: cflag |= B57600; break; case 115200: cflag |= B115200; break; case 9600: default: cflag |= B9600; break; } switch(bits) { case 7: cflag |= CS7; break; default: case 8: cflag |= CS8; break; } switch(parity) { case 'o': case 'O': cflag |= PARODD; break; case 'e': case 'E': cflag |= PARENB; break; } co->cflag = cflag; /* * Divisor, bytesize and parity */ state = rs_table + co->index; info = &async_sercons; info->magic = SERIAL_MAGIC; info->state = state; info->port = state->port; info->flags = state->flags; info->io_type = state->io_type; info->iomem_base = state->iomem_base; info->iomem_reg_shift = state->iomem_reg_shift; quot = state->baud_base / baud; switch (cflag & CSIZE) { case CS7: cval = TXx927_SILCR_UMODE_7BIT; break; default: case CS8: cval = TXx927_SILCR_UMODE_8BIT; break; } if (cflag & CSTOPB) cval |= TXx927_SILCR_USBL_2BIT; else cval |= TXx927_SILCR_USBL_1BIT; if (cflag & PARENB) cval |= TXx927_SILCR_UPEN; if (!(cflag & PARODD)) cval |= TXx927_SILCR_UEPS; /* * Disable UART interrupts, set DTR and RTS high * and set speed. */ sio_reg(info)->dicr = 0; sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG; sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0; /* HW RTS/CTS control */ if (info->flags & ASYNC_HAVE_CTS_LINE) sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RTSTL_MAX /* 15 */; /* Enable RX/TX */ sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE); return 0; } static struct console sercons = { name: TXX927_TTY_NAME, write: serial_console_write, device: serial_console_device, setup: serial_console_setup, flags: CON_PRINTBUFFER, index: -1, }; /* * Register console. */ void __init txx927_console_init(void) { register_console(&sercons); } #endif
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