diff options
Diffstat (limited to 'arch/ia64/hp/sim/simserial.c')
| -rw-r--r-- | arch/ia64/hp/sim/simserial.c | 1032 |
1 files changed, 1032 insertions, 0 deletions
diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c new file mode 100644 index 00000000000..786e70718ce --- /dev/null +++ b/arch/ia64/hp/sim/simserial.c @@ -0,0 +1,1032 @@ +/* + * Simulated Serial Driver (fake serial) + * + * This driver is mostly used for bringup purposes and will go away. + * It has a strong dependency on the system console. All outputs + * are rerouted to the same facility as the one used by printk which, in our + * case means sys_sim.c console (goes via the simulator). The code hereafter + * is completely leveraged from the serial.c driver. + * + * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co + * Stephane Eranian <eranian@hpl.hp.com> + * David Mosberger-Tang <davidm@hpl.hp.com> + * + * 02/04/00 D. Mosberger Merged in serial.c bug fixes in rs_close(). + * 02/25/00 D. Mosberger Synced up with 2.3.99pre-5 version of serial.c. + * 07/30/02 D. Mosberger Replace sti()/cli() with explicit spinlocks & local irq masking + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/major.h> +#include <linux/fcntl.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/console.h> +#include <linux/module.h> +#include <linux/serial.h> +#include <linux/serialP.h> + +#include <asm/irq.h> +#include <asm/hw_irq.h> +#include <asm/uaccess.h> + +#ifdef CONFIG_KDB +# include <linux/kdb.h> +#endif + +#undef SIMSERIAL_DEBUG /* define this to get some debug information */ + +#define KEYBOARD_INTR 3 /* must match with simulator! */ + +#define NR_PORTS 1 /* only one port for now */ +#define SERIAL_INLINE 1 + +#ifdef SERIAL_INLINE +#define _INLINE_ inline +#endif + +#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT) + +#define SSC_GETCHAR 21 + +extern long ia64_ssc (long, long, long, long, int); +extern void ia64_ssc_connect_irq (long intr, long irq); + +static char *serial_name = "SimSerial driver"; +static char *serial_version = "0.6"; + +/* + * This has been extracted from asm/serial.h. We need one eventually but + * I don't know exactly what we're going to put in it so just fake one + * for now. + */ +#define BASE_BAUD ( 1843200 / 16 ) + +#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) + +/* + * Most of the values here are meaningless to this particular driver. + * However some values must be preserved for the code (leveraged from serial.c + * to work correctly). + * port must not be 0 + * type must not be UNKNOWN + * So I picked arbitrary (guess from where?) values instead + */ +static struct serial_state rs_table[NR_PORTS]={ + /* UART CLK PORT IRQ FLAGS */ + { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 } /* ttyS0 */ +}; + +/* + * Just for the fun of it ! + */ +static struct serial_uart_config uart_config[] = { + { "unknown", 1, 0 }, + { "8250", 1, 0 }, + { "16450", 1, 0 }, + { "16550", 1, 0 }, + { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO }, + { "cirrus", 1, 0 }, + { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH }, + { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | + UART_STARTECH }, + { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO}, + { 0, 0} +}; + +struct tty_driver *hp_simserial_driver; + +static struct async_struct *IRQ_ports[NR_IRQS]; + +static struct console *console; + +static unsigned char *tmp_buf; +static DECLARE_MUTEX(tmp_buf_sem); + +extern struct console *console_drivers; /* from kernel/printk.c */ + +/* + * ------------------------------------------------------------ + * 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) +{ +#ifdef SIMSERIAL_DEBUG + printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n", + tty->stopped, tty->hw_stopped, tty->flow_stopped); +#endif + +} + +static void rs_start(struct tty_struct *tty) +{ +#if SIMSERIAL_DEBUG + printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n", + tty->stopped, tty->hw_stopped, tty->flow_stopped); +#endif +} + +static void receive_chars(struct tty_struct *tty, struct pt_regs *regs) +{ + unsigned char ch; + static unsigned char seen_esc = 0; + + while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) { + if ( ch == 27 && seen_esc == 0 ) { + seen_esc = 1; + continue; + } else { + if ( seen_esc==1 && ch == 'O' ) { + seen_esc = 2; + continue; + } else if ( seen_esc == 2 ) { + if ( ch == 'P' ) show_state(); /* F1 key */ +#ifdef CONFIG_KDB + if ( ch == 'S' ) + kdb(KDB_REASON_KEYBOARD, 0, (kdb_eframe_t) regs); +#endif + + seen_esc = 0; + continue; + } + } + seen_esc = 0; + if (tty->flip.count >= TTY_FLIPBUF_SIZE) break; + + *tty->flip.char_buf_ptr = ch; + + *tty->flip.flag_buf_ptr = 0; + + tty->flip.flag_buf_ptr++; + tty->flip.char_buf_ptr++; + tty->flip.count++; + } + tty_flip_buffer_push(tty); +} + +/* + * This is the serial driver's interrupt routine for a single port + */ +static irqreturn_t rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs) +{ + struct async_struct * info; + + /* + * I don't know exactly why they don't use the dev_id opaque data + * pointer instead of this extra lookup table + */ + info = IRQ_ports[irq]; + if (!info || !info->tty) { + printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info); + return IRQ_NONE; + } + /* + * pretty simple in our case, because we only get interrupts + * on inbound traffic + */ + receive_chars(info->tty, regs); + return IRQ_HANDLED; +} + +/* + * ------------------------------------------------------------------- + * Here ends the serial interrupt routines. + * ------------------------------------------------------------------- + */ + +#if 0 +/* + * not really used in our situation so keep them commented out for now + */ +static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */ +static void do_serial_bh(void) +{ + run_task_queue(&tq_serial); + printk(KERN_ERR "do_serial_bh: called\n"); +} +#endif + +static void do_softint(void *private_) +{ + printk(KERN_ERR "simserial: do_softint called\n"); +} + +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 (!tty || !info->xmit.buf) return; + + local_irq_save(flags); + if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) { + local_irq_restore(flags); + return; + } + info->xmit.buf[info->xmit.head] = ch; + info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1); + local_irq_restore(flags); +} + +static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done) +{ + int count; + unsigned long flags; + + + local_irq_save(flags); + + if (info->x_char) { + char c = info->x_char; + + console->write(console, &c, 1); + + info->state->icount.tx++; + info->x_char = 0; + + goto out; + } + + if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) { +#ifdef SIMSERIAL_DEBUG + printk("transmit_chars: head=%d, tail=%d, stopped=%d\n", + info->xmit.head, info->xmit.tail, info->tty->stopped); +#endif + goto out; + } + /* + * We removed the loop and try to do it in to chunks. We need + * 2 operations maximum because it's a ring buffer. + * + * First from current to tail if possible. + * Then from the beginning of the buffer until necessary + */ + + count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE), + SERIAL_XMIT_SIZE - info->xmit.tail); + console->write(console, info->xmit.buf+info->xmit.tail, count); + + info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1); + + /* + * We have more at the beginning of the buffer + */ + count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); + if (count) { + console->write(console, info->xmit.buf, count); + info->xmit.tail += count; + } +out: + local_irq_restore(flags); +} + +static void rs_flush_chars(struct tty_struct *tty) +{ + struct async_struct *info = (struct async_struct *)tty->driver_data; + + if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped || + !info->xmit.buf) + return; + + transmit_chars(info, NULL); +} + + +static int rs_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + int c, ret = 0; + struct async_struct *info = (struct async_struct *)tty->driver_data; + unsigned long flags; + + if (!tty || !info->xmit.buf || !tmp_buf) return 0; + + local_irq_save(flags); + 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; + } + local_irq_restore(flags); + /* + * Hey, we transmit directly from here in our case + */ + if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) + && !tty->stopped && !tty->hw_stopped) { + transmit_chars(info, NULL); + } + return ret; +} + +static int rs_write_room(struct tty_struct *tty) +{ + struct async_struct *info = (struct async_struct *)tty->driver_data; + + 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; + + 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; + + local_irq_save(flags); + info->xmit.head = info->xmit.tail = 0; + local_irq_restore(flags); + + wake_up_interruptible(&tty->write_wait); + + 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; + + info->x_char = ch; + if (ch) { + /* + * I guess we could call console->write() directly but + * let's do that for now. + */ + transmit_chars(info, NULL); + } +} + +/* + * ------------------------------------------------------------ + * 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) +{ + if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); + + printk(KERN_INFO "simrs_throttle called\n"); +} + +static void rs_unthrottle(struct tty_struct * tty) +{ + struct async_struct *info = (struct async_struct *)tty->driver_data; + + if (I_IXOFF(tty)) { + if (info->x_char) + info->x_char = 0; + else + rs_send_xchar(tty, START_CHAR(tty)); + } + printk(KERN_INFO "simrs_unthrottle called\n"); +} + +/* + * rs_break() --- routine which turns the break handling on or off + */ +static void rs_break(struct tty_struct *tty, int break_state) +{ +} + +static int rs_ioctl(struct tty_struct *tty, struct file * file, + unsigned int cmd, unsigned long arg) +{ + 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: + printk(KERN_INFO "rs_ioctl: TIOCMGET called\n"); + return -EINVAL; + case TIOCMBIS: + case TIOCMBIC: + case TIOCMSET: + printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n"); + return -EINVAL; + case TIOCGSERIAL: + printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n"); + return 0; + case TIOCSSERIAL: + printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n"); + return 0; + case TIOCSERCONFIG: + printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n"); + return -EINVAL; + + case TIOCSERGETLSR: /* Get line status register */ + printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n"); + return -EINVAL; + + case TIOCSERGSTRUCT: + printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n"); +#if 0 + if (copy_to_user((struct async_struct *) arg, + info, sizeof(struct async_struct))) + return -EFAULT; +#endif + 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(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\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(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n"); + return 0; + + case TIOCSERGWILD: + case TIOCSERSWILD: + /* "setserial -W" is called in Debian boot */ + printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n"); + return 0; + + default: + return -ENOIOCTLCMD; + } + return 0; +} + +#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) + +static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) +{ + 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; + + + /* Handle turning off CRTSCTS */ + if ((old_termios->c_cflag & CRTSCTS) && + !(tty->termios->c_cflag & CRTSCTS)) { + tty->hw_stopped = 0; + rs_start(tty); + } +} +/* + * 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 SIMSERIAL_DEBUG + printk("Shutting down serial port %d (irq %d)....", info->line, + state->irq); +#endif + + local_irq_save(flags); + { + /* + * 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; + + /* + * 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, + IRQ_T(info), "serial", NULL); + + if (retval) + printk(KERN_ERR "serial 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; + } + + if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); + + info->flags &= ~ASYNC_INITIALIZED; + } + local_irq_restore(flags); +} + +/* + * ------------------------------------------------------------ + * 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 ) return; + + state = info->state; + + local_irq_save(flags); + if (tty_hung_up_p(filp)) { +#ifdef SIMSERIAL_DEBUG + printk("rs_close: hung_up\n"); +#endif + local_irq_restore(flags); + return; + } +#ifdef SIMSERIAL_DEBUG + 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_ERR "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_ERR "rs_close: bad serial port count for ttys%d: %d\n", + info->line, state->count); + state->count = 0; + } + if (state->count) { + local_irq_restore(flags); + return; + } + info->flags |= ASYNC_CLOSING; + local_irq_restore(flags); + + /* + * Now we wait for the transmit buffer to clear; and we notify + * the line discipline to only process XON/XOFF characters. + */ + shutdown(info); + if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); + if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); + 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_CLOSING); + wake_up_interruptible(&info->close_wait); +} + +/* + * rs_wait_until_sent() --- wait until the transmitter is empty + */ +static void rs_wait_until_sent(struct tty_struct *tty, int timeout) +{ +} + + +/* + * 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; + +#ifdef SIMSERIAL_DEBUG + printk("rs_hangup: called\n"); +#endif + + 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; + info->tty = 0; + wake_up_interruptible(&info->open_wait); +} + + +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->xmit_fifo_size = sstate->xmit_fifo_size; + info->line = line; + INIT_WORK(&info->work, do_softint, info); + info->state = sstate; + if (sstate->info) { + kfree(info); + *ret_info = sstate->info; + return 0; + } + *ret_info = sstate->info = info; + return 0; +} + +static int +startup(struct async_struct *info) +{ + unsigned long flags; + int retval=0; + irqreturn_t (*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; + + local_irq_save(flags); + + if (info->flags & ASYNC_INITIALIZED) { + free_page(page); + goto errout; + } + + if (!state->port || !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; + +#ifdef SIMSERIAL_DEBUG + printk("startup: ttys%d (irq %d)...", info->line, state->irq); +#endif + + /* + * 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; + } else + handler = rs_interrupt_single; + + retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", 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; + + if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); + + info->xmit.head = info->xmit.tail = 0; + +#if 0 + /* + * Set up serial timers... + */ + timer_table[RS_TIMER].expires = jiffies + 2*HZ/100; + timer_active |= 1 << RS_TIMER; +#endif + + /* + * 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; + } + + info->flags |= ASYNC_INITIALIZED; + local_irq_restore(flags); + return 0; + +errout: + local_irq_restore(flags); + return retval; +} + + +/* + * 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 = tty->index; + 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 SIMSERIAL_DEBUG + printk("rs_open %s, count = %d\n", tty->name, 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) + 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; + } + + /* + * figure out which console to use (should be one already) + */ + console = console_drivers; + while (console) { + if ((console->flags & CON_ENABLED) && console->write) break; + console = console->next; + } + +#ifdef SIMSERIAL_DEBUG + printk("rs_open ttys%d successful\n", info->line); +#endif + return 0; +} + +/* + * /proc fs routines.... + */ + +static inline int line_info(char *buf, struct serial_state *state) +{ + return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n", + state->line, uart_config[state->type].name, + state->port, state->irq); +} + +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, "simserinfo: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 with", serial_name, serial_version); + printk(KERN_INFO " no serial options enabled\n"); +} + +static struct tty_operations hp_ops = { + .open = rs_open, + .close = rs_close, + .write = rs_write, + .put_char = rs_put_char, + .flush_chars = rs_flush_chars, + .write_room = rs_write_room, + .chars_in_buffer = rs_chars_in_buffer, + .flush_buffer = rs_flush_buffer, + .ioctl = rs_ioctl, + .throttle = rs_throttle, + .unthrottle = rs_unthrottle, + .send_xchar = rs_send_xchar, + .set_termios = rs_set_termios, + .stop = rs_stop, + .start = rs_start, + .hangup = rs_hangup, + .break_ctl = rs_break, + .wait_until_sent = rs_wait_until_sent, + .read_proc = rs_read_proc, +}; + +/* + * The serial driver boot-time initialization code! + */ +static int __init +simrs_init (void) +{ + int i; + struct serial_state *state; + + if (!ia64_platform_is("hpsim")) + return -ENODEV; + + hp_simserial_driver = alloc_tty_driver(1); + if (!hp_simserial_driver) + return -ENOMEM; + + show_serial_version(); + + /* Initialize the tty_driver structure */ + + hp_simserial_driver->owner = THIS_MODULE; + hp_simserial_driver->driver_name = "simserial"; + hp_simserial_driver->name = "ttyS"; + hp_simserial_driver->major = TTY_MAJOR; + hp_simserial_driver->minor_start = 64; + hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL; + hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL; + hp_simserial_driver->init_termios = tty_std_termios; + hp_simserial_driver->init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(hp_simserial_driver, &hp_ops); + + /* + * Let's have a little bit of fun ! + */ + for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { + + if (state->type == PORT_UNKNOWN) continue; + + if (!state->irq) { + state->irq = assign_irq_vector(AUTO_ASSIGN); + ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq); + } + + printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n", + state->line, + state->port, state->irq, + uart_config[state->type].name); + } + + if (tty_register_driver(hp_simserial_driver)) + panic("Couldn't register simserial driver\n"); + + return 0; +} + +#ifndef MODULE +__initcall(simrs_init); +#endif |