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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [dz.c] - Blame information for rev 1275

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/*
 * dz.c: Serial port driver for DECStations equiped
 *       with the DZ chipset.
 *
 * Copyright (C) 1998 Olivier A. D. Lebaillif
 *
 * Email: olivier.lebaillif@ifrsys.com
 *
 * [31-AUG-98] triemer
 * Changed IRQ to use Harald's dec internals interrupts.h
 * removed base_addr code - moving address assignment to setup.c
 * Changed name of dz_init to rs_init to be consistent with tc code
 * [13-NOV-98] triemer fixed code to receive characters
 *    after patches by harald to irq code.
 * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
 *            field from "current" - somewhere between 2.1.121 and 2.1.131
 Qua Jun 27 15:02:26 BRT 2001
 * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
 *
 * Parts (C) 1999 David Airlie, airlied@linux.ie
 * [07-SEP-99] Bugfixes
 */
 
#undef DEBUG_DZ
 
#include <linux/config.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/tqueue.h>
#include <linux/interrupt.h>
 
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
 
#include <linux/ptrace.h>
#include <linux/fs.h>
 
#include <asm/bootinfo.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/kn01.h>
#include <asm/dec/kn02.h>
#include <asm/dec/machtype.h>
#include <asm/dec/prom.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/uaccess.h>
 
#define CONSOLE_LINE (3)        /* for definition of struct console */
 
#include "dz.h"
 
#define DZ_INTR_DEBUG 1
 
DECLARE_TASK_QUEUE(tq_serial);
 
static struct dz_serial *lines[4];
static unsigned char tmp_buffer[256];
 
#ifdef DEBUG_DZ
/*
 * debugging code to send out chars via prom
 */
static void debug_console(const char *s, int count)
{
        unsigned i;
 
        for (i = 0; i < count; i++) {
                if (*s == 10)
                        prom_printf("%c", 13);
                prom_printf("%c", *s++);
        }
}
#endif
 
/*
 * ------------------------------------------------------------
 * dz_in () and dz_out ()
 *
 * These routines are used to access the registers of the DZ
 * chip, hiding relocation differences between implementation.
 * ------------------------------------------------------------
 */
 
static inline unsigned short dz_in(struct dz_serial *info, unsigned offset)
{
        volatile unsigned short *addr =
                (volatile unsigned short *) (info->port + offset);
        return *addr;
}
 
static inline void dz_out(struct dz_serial *info, unsigned offset,
                          unsigned short value)
{
 
        volatile unsigned short *addr =
                (volatile unsigned short *) (info->port + offset);
        *addr = value;
}
 
/*
 * ------------------------------------------------------------
 * rs_stop () and rs_start ()
 *
 * These routines are called before setting or resetting
 * tty->stopped. They enable or disable transmitter interrupts,
 * as necessary.
 * ------------------------------------------------------------
 */
 
static void dz_stop(struct tty_struct *tty)
{
        struct dz_serial *info;
        unsigned short mask, tmp;
 
        if (tty == 0)
                return;
 
        info = (struct dz_serial *) tty->driver_data;
 
        mask = 1 << info->line;
        tmp = dz_in(info, DZ_TCR);      /* read the TX flag */
 
        tmp &= ~mask;           /* clear the TX flag */
        dz_out(info, DZ_TCR, tmp);
}
 
static void dz_start(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        unsigned short mask, tmp;
 
        mask = 1 << info->line;
        tmp = dz_in(info, DZ_TCR);      /* read the TX flag */
 
        tmp |= mask;            /* set the TX flag */
        dz_out(info, DZ_TCR, tmp);
 
}
 
/*
 * ------------------------------------------------------------
 * Here starts the interrupt handling routines.  All of the
 * following subroutines are declared as inline and are folded
 * into dz_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 dz.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 * ------------------------------------------------------------
 */
 
/*
 * ------------------------------------------------------------
 * dz_sched_event ()
 *
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver.
 * ------------------------------------------------------------
 */
static inline void dz_sched_event(struct dz_serial *info, int event)
{
        info->event |= 1 << event;
        queue_task(&info->tqueue, &tq_serial);
        mark_bh(SERIAL_BH);
}
 
/*
 * ------------------------------------------------------------
 * receive_char ()
 *
 * This routine deals with inputs from any lines.
 * ------------------------------------------------------------
 */
static inline void receive_chars(struct dz_serial *info_in)
{
 
        struct dz_serial *info;
        struct tty_struct *tty = 0;
        struct async_icount *icount;
        int ignore = 0;
        unsigned short status, tmp;
        unsigned char ch;
 
        /* this code is going to be a problem...
           the call to tty_flip_buffer is going to need
           to be rethought...
         */
        do {
                status = dz_in(info_in, DZ_RBUF);
                info = lines[LINE(status)];
 
                /* punt so we don't get duplicate characters */
                if (!(status & DZ_DVAL))
                        goto ignore_char;
 
                ch = UCHAR(status);     /* grab the char */
 
#if 0
                if (info->is_console) {
                        if (ch == 0)
                                return; /* it's a break ... */
                }
#endif
 
                tty = info->tty;        /* now tty points to the proper dev */
                icount = &info->icount;
 
                if (!tty)
                        break;
                if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                        break;
 
                *tty->flip.char_buf_ptr = ch;
                *tty->flip.flag_buf_ptr = 0;
                icount->rx++;
 
                /* keep track of the statistics */
                if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
                        if (status & DZ_PERR)   /* parity error */
                                icount->parity++;
                        else if (status & DZ_FERR)      /* frame error */
                                icount->frame++;
                        if (status & DZ_OERR)   /* overrun error */
                                icount->overrun++;
 
                        /*  check to see if we should ignore the character
                           and mask off conditions that should be ignored
                         */
 
                        if (status & info->ignore_status_mask) {
                                if (++ignore > 100)
                                        break;
                                goto ignore_char;
                        }
                        /* mask off the error conditions we want to ignore */
                        tmp = status & info->read_status_mask;
 
                        if (tmp & DZ_PERR) {
                                *tty->flip.flag_buf_ptr = TTY_PARITY;
#ifdef DEBUG_DZ
                                debug_console("PERR\n", 5);
#endif
                        } else if (tmp & DZ_FERR) {
                                *tty->flip.flag_buf_ptr = TTY_FRAME;
#ifdef DEBUG_DZ
                                debug_console("FERR\n", 5);
#endif
                        }
                        if (tmp & DZ_OERR) {
#ifdef DEBUG_DZ
                                debug_console("OERR\n", 5);
#endif
                                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:
        } while (status & DZ_DVAL);
 
        if (tty)
                tty_flip_buffer_push(tty);
}
 
/*
 * ------------------------------------------------------------
 * transmit_char ()
 *
 * This routine deals with outputs to any lines.
 * ------------------------------------------------------------
 */
static inline void transmit_chars(struct dz_serial *info)
{
        unsigned char tmp;
 
 
 
        if (info->x_char) {     /* XON/XOFF chars */
                dz_out(info, DZ_TDR, info->x_char);
                info->icount.tx++;
                info->x_char = 0;
                return;
        }
        /* if nothing to do or stopped or hardware stopped */
        if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tty->hw_stopped) {
                dz_stop(info->tty);
                return;
        }
        /*
         * if something to do ... (rember the dz has no output fifo so we go
         * one char at a time :-<
         */
        tmp = (unsigned short) info->xmit_buf[info->xmit_tail++];
        dz_out(info, DZ_TDR, tmp);
        info->xmit_tail = info->xmit_tail & (DZ_XMIT_SIZE - 1);
        info->icount.tx++;
 
        if (--info->xmit_cnt < WAKEUP_CHARS)
                dz_sched_event(info, DZ_EVENT_WRITE_WAKEUP);
 
 
        /* Are we done */
        if (info->xmit_cnt <= 0)
                dz_stop(info->tty);
}
 
/*
 * ------------------------------------------------------------
 * check_modem_status ()
 *
 * Only valid for the MODEM line duh !
 * ------------------------------------------------------------
 */
static inline void check_modem_status(struct dz_serial *info)
{
        unsigned short status;
 
        /* if not ne modem line just return */
        if (info->line != DZ_MODEM)
                return;
 
        status = dz_in(info, DZ_MSR);
 
        /* it's easy, since DSR2 is the only bit in the register */
        if (status)
                info->icount.dsr++;
}
 
/*
 * ------------------------------------------------------------
 * dz_interrupt ()
 *
 * this is the main interrupt routine for the DZ chip.
 * It deals with the multiple ports.
 * ------------------------------------------------------------
 */
static void dz_interrupt(int irq, void *dev, struct pt_regs *regs)
{
        struct dz_serial *info;
        unsigned short status;
 
        /* get the reason why we just got an irq */
        status = dz_in((struct dz_serial *) dev, DZ_CSR);
        info = lines[LINE(status)];     /* re-arrange info the proper port */
 
        if (status & DZ_RDONE)
                receive_chars(info);    /* the receive function */
 
        if (status & DZ_TRDY)
                transmit_chars(info);
}
 
/*
 * -------------------------------------------------------------------
 * Here ends the DZ 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_data)
{
        struct dz_serial *info = (struct dz_serial *) private_data;
        struct tty_struct *tty = info->tty;
 
        if (!tty)
                return;
 
        if (test_and_clear_bit(DZ_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);
        }
}
 
/*
 * -------------------------------------------------------------------
 * This routine is called from the scheduler tqueue when the interrupt
 * routine has signalled that a hangup has occurred.  The path of
 * hangup processing is:
 *
 *      serial interrupt routine -> (scheduler tqueue) ->
 *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 * -------------------------------------------------------------------
 */
static void do_serial_hangup(void *private_data)
{
        struct dz_serial *info = (struct dz_serial *) private_data;
        struct tty_struct *tty = info->tty;;
 
        if (!tty)
                return;
 
        tty_hangup(tty);
}
 
/*
 * -------------------------------------------------------------------
 * startup ()
 *
 * various initialization tasks
 * -------------------------------------------------------------------
 */
static int startup(struct dz_serial *info)
{
        unsigned long page, flags;
        unsigned short tmp;
 
        if (info->is_initialized)
                return 0;
 
        save_flags(flags);
        cli();
 
        if (!info->port) {
                if (info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                restore_flags(flags);
                return -ENODEV;
        }
        if (!info->xmit_buf) {
                page = get_free_page(GFP_KERNEL);
                if (!page) {
                        restore_flags(flags);
                        return -ENOMEM;
                }
                info->xmit_buf = (unsigned char *) page;
        }
        if (info->tty)
                clear_bit(TTY_IO_ERROR, &info->tty->flags);
 
        /* enable the interrupt and the scanning */
        tmp = dz_in(info, DZ_CSR);
        tmp |= (DZ_RIE | DZ_TIE | DZ_MSE);
        dz_out(info, DZ_CSR, tmp);
 
        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 
        /* set up the speed */
        change_speed(info);
 
        /* clear the line transmitter buffer
           I can't figure out why I need to do this - but
           its necessary - in order for the console portion
           and the interrupt portion to live happily side by side.
         */
 
        /* clear the line transmitter buffer
           I can't figure out why I need to do this - but
           its necessary - in order for the console portion
           and the interrupt portion to live happily side by side.
         */
 
        info->is_initialized = 1;
 
        restore_flags(flags);
        return 0;
}
 
/*
 * -------------------------------------------------------------------
 * shutdown ()
 *
 * 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 dz_serial *info)
{
        unsigned long flags;
        unsigned short tmp;
 
        if (!info->is_initialized)
                return;
 
        save_flags(flags);
        cli();
 
        dz_stop(info->tty);
 
 
 
        info->cflags &= ~DZ_CREAD;      /* turn off receive enable flag */
        dz_out(info, DZ_LPR, info->cflags);
 
        if (info->xmit_buf) {   /* free Tx buffer */
                free_page((unsigned long) info->xmit_buf);
                info->xmit_buf = 0;
        }
        if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
                tmp = dz_in(info, DZ_TCR);
                if (tmp & DZ_MODEM_DTR) {
                        tmp &= ~DZ_MODEM_DTR;
                        dz_out(info, DZ_TCR, tmp);
                }
        }
        if (info->tty)
                set_bit(TTY_IO_ERROR, &info->tty->flags);
 
        info->is_initialized = 0;
        restore_flags(flags);
}
 
/*
 * -------------------------------------------------------------------
 * change_speed ()
 *
 * set the baud rate.
 * -------------------------------------------------------------------
 */
static void change_speed(struct dz_serial *info)
{
        unsigned long flags;
        unsigned cflag;
        int baud;
 
        if (!info->tty || !info->tty->termios)
                return;
 
        save_flags(flags);
        cli();
 
        info->cflags = info->line;
 
        cflag = info->tty->termios->c_cflag;
 
        switch (cflag & CSIZE) {
        case CS5:
                info->cflags |= DZ_CS5;
                break;
        case CS6:
                info->cflags |= DZ_CS6;
                break;
        case CS7:
                info->cflags |= DZ_CS7;
                break;
        case CS8:
        default:
                info->cflags |= DZ_CS8;
        }
 
        if (cflag & CSTOPB)
                info->cflags |= DZ_CSTOPB;
        if (cflag & PARENB)
                info->cflags |= DZ_PARENB;
        if (cflag & PARODD)
                info->cflags |= DZ_PARODD;
 
        baud = tty_get_baud_rate(info->tty);
        switch (baud) {
        case 50:
                info->cflags |= DZ_B50;
                break;
        case 75:
                info->cflags |= DZ_B75;
                break;
        case 110:
                info->cflags |= DZ_B110;
                break;
        case 134:
                info->cflags |= DZ_B134;
                break;
        case 150:
                info->cflags |= DZ_B150;
                break;
        case 300:
                info->cflags |= DZ_B300;
                break;
        case 600:
                info->cflags |= DZ_B600;
                break;
        case 1200:
                info->cflags |= DZ_B1200;
                break;
        case 1800:
                info->cflags |= DZ_B1800;
                break;
        case 2000:
                info->cflags |= DZ_B2000;
                break;
        case 2400:
                info->cflags |= DZ_B2400;
                break;
        case 3600:
                info->cflags |= DZ_B3600;
                break;
        case 4800:
                info->cflags |= DZ_B4800;
                break;
        case 7200:
                info->cflags |= DZ_B7200;
                break;
        case 9600:
        default:
                info->cflags |= DZ_B9600;
        }
 
        info->cflags |= DZ_RXENAB;
        dz_out(info, DZ_LPR, info->cflags);
 
        /* setup accept flag */
        info->read_status_mask = DZ_OERR;
        if (I_INPCK(info->tty))
                info->read_status_mask |= (DZ_FERR | DZ_PERR);
 
        /* characters to ignore */
        info->ignore_status_mask = 0;
        if (I_IGNPAR(info->tty))
                info->ignore_status_mask |= (DZ_FERR | DZ_PERR);
 
        restore_flags(flags);
}
 
/*
 * -------------------------------------------------------------------
 * dz_flush_char ()
 *
 * Flush the buffer.
 * -------------------------------------------------------------------
 */
static void dz_flush_chars(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        unsigned long flags;
 
        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !info->xmit_buf)
                return;
 
        save_flags(flags);
        cli();
 
        dz_start(info->tty);
 
        restore_flags(flags);
}
 
 
/*
 * -------------------------------------------------------------------
 * dz_write ()
 *
 * main output routine.
 * -------------------------------------------------------------------
 */
static int dz_write(struct tty_struct *tty, int from_user, const unsigned char *buf, int count)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        unsigned long flags;
        int c, ret = 0;
 
        if (!tty)
                return ret;
        if (!info->xmit_buf)
                return ret;
        if (!tmp_buf)
                tmp_buf = tmp_buffer;
 
 
 
        if (from_user) {
 
                down(&tmp_buf_sem);
                while (1) {
                        c = MIN(count, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
                        if (c <= 0)
                                break;
 
                        c -= copy_from_user(tmp_buf, buf, c);
                        if (!c) {
                                if (!ret)
                                        ret = -EFAULT;
                                break;
                        }
                        save_flags(flags);
                        cli();
 
                        c = MIN(c, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
                        memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
                        info->xmit_head = ((info->xmit_head + c) & (DZ_XMIT_SIZE - 1));
                        info->xmit_cnt += c;
 
                        restore_flags(flags);
 
                        buf += c;
                        count -= c;
                        ret += c;
                }
 
                up(&tmp_buf_sem);
        } else {
 
 
                while (1) {
                        save_flags(flags);
                        cli();
 
                        c = MIN(count, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
                        if (c <= 0) {
                                restore_flags(flags);
                                break;
                        }
                        memcpy(info->xmit_buf + info->xmit_head, buf, c);
                        info->xmit_head = ((info->xmit_head + c) & (DZ_XMIT_SIZE - 1));
                        info->xmit_cnt += c;
 
                        restore_flags(flags);
 
                        buf += c;
                        count -= c;
                        ret += c;
                }
        }
 
 
        if (info->xmit_cnt) {
                if (!tty->stopped) {
                        if (!tty->hw_stopped) {
                                dz_start(info->tty);
                        }
                }
        }
        return ret;
}
 
/*
 * -------------------------------------------------------------------
 * dz_write_room ()
 *
 * compute the amount of space available for writing.
 * -------------------------------------------------------------------
 */
static int dz_write_room(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        int ret;
 
        ret = DZ_XMIT_SIZE - info->xmit_cnt - 1;
        if (ret < 0)
                ret = 0;
        return ret;
}
 
/*
 * -------------------------------------------------------------------
 * dz_chars_in_buffer ()
 *
 * compute the amount of char left to be transmitted
 * -------------------------------------------------------------------
 */
static int dz_chars_in_buffer(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        return info->xmit_cnt;
}
 
/*
 * -------------------------------------------------------------------
 * dz_flush_buffer ()
 *
 * Empty the output buffer
 * -------------------------------------------------------------------
 */
static void dz_flush_buffer(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        cli();
        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
        sti();
 
        wake_up_interruptible(&tty->write_wait);
 
        if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
                (tty->ldisc.write_wakeup) (tty);
}
 
/*
 * ------------------------------------------------------------
 * dz_throttle () and dz_unthrottle ()
 *
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled (or not).
 * ------------------------------------------------------------
 */
static void dz_throttle(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        if (I_IXOFF(tty))
                info->x_char = STOP_CHAR(tty);
}
 
static void dz_unthrottle(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        if (I_IXOFF(tty)) {
                if (info->x_char)
                        info->x_char = 0;
                else
                        info->x_char = START_CHAR(tty);
        }
}
 
static void dz_send_xchar(struct tty_struct *tty, char ch)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        info->x_char = ch;
 
        if (ch)
                dz_start(info->tty);
}
 
/*
 * ------------------------------------------------------------
 * rs_ioctl () and friends
 * ------------------------------------------------------------
 */
static int get_serial_info(struct dz_serial *info,
                           struct serial_struct *retinfo)
{
        struct serial_struct tmp;
 
        if (!retinfo)
                return -EFAULT;
 
        memset(&tmp, 0, sizeof(tmp));
 
        tmp.type = info->type;
        tmp.line = info->line;
        tmp.port = info->port;
        tmp.irq = dec_interrupt[DEC_IRQ_DZ11];
        tmp.flags = info->flags;
        tmp.baud_base = info->baud_base;
        tmp.close_delay = info->close_delay;
        tmp.closing_wait = info->closing_wait;
 
        return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
}
 
static int set_serial_info(struct dz_serial *info,
                           struct serial_struct *new_info)
{
        struct serial_struct new_serial;
        struct dz_serial old_info;
        int retval = 0;
 
        if (!new_info)
                return -EFAULT;
 
        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
                return -EFAULT;
 
        old_info = *info;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
        if (info->count > 1)
                return -EBUSY;
 
        /*
         * OK, past this point, all the error checking has been done.
         * At this point, we start making changes.....
         */
 
        info->baud_base = new_serial.baud_base;
        info->type = new_serial.type;
        info->close_delay = new_serial.close_delay;
        info->closing_wait = new_serial.closing_wait;
 
        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 dz_serial *info, unsigned int *value)
{
        unsigned short status = dz_in(info, DZ_LPR);
 
        return put_user(status, value);
}
 
/*
 * This routine sends a break character out the serial port.
 */
static void send_break(struct dz_serial *info, int duration)
{
        unsigned long flags;
        unsigned short tmp, mask;
 
        if (!info->port)
                return;
 
        mask = 1 << info->line;
        tmp = dz_in(info, DZ_TCR);
        tmp |= mask;
 
        current->state = TASK_INTERRUPTIBLE;
 
        save_flags(flags);
        cli();
 
        dz_out(info, DZ_TCR, tmp);
 
        schedule_timeout(duration);
 
        tmp &= ~mask;
        dz_out(info, DZ_TCR, tmp);
 
        restore_flags(flags);
}
 
static int dz_ioctl(struct tty_struct *tty, struct file *file,
                    unsigned int cmd, unsigned long arg)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        int retval;
 
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
            (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
                if (tty->flags & (1 << TTY_IO_ERROR))
                        return -EIO;
        }
        switch (cmd) {
        case TCSBRK:            /* SVID version: non-zero arg --> no break */
                retval = tty_check_change(tty);
                if (retval)
                        return retval;
                tty_wait_until_sent(tty, 0);
                if (!arg)
                        send_break(info, HZ / 4);       /* 1/4 second */
                return 0;
 
        case TCSBRKP:           /* support for POSIX tcsendbreak() */
                retval = tty_check_change(tty);
                if (retval)
                        return retval;
                tty_wait_until_sent(tty, 0);
                send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
                return 0;
 
        case TIOCGSOFTCAR:
                return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg);
 
        case TIOCSSOFTCAR:
                if (get_user(arg, (unsigned long *) arg))
                        return -EFAULT;
                tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) |
                                         (arg ? CLOCAL : 0));
                return 0;
 
        case TIOCGSERIAL:
                return get_serial_info(info, (struct serial_struct *) arg);
 
        case TIOCSSERIAL:
                return set_serial_info(info, (struct serial_struct *) arg);
 
        case TIOCSERGETLSR:     /* Get line status register */
                return get_lsr_info(info, (unsigned int *) arg);
 
        case TIOCSERGSTRUCT:
                return copy_to_user((struct dz_serial *) arg, info,
                                 sizeof(struct dz_serial)) ? -EFAULT : 0;
 
        default:
                return -ENOIOCTLCMD;
        }
 
        return 0;
}
 
static void dz_set_termios(struct tty_struct *tty,
                           struct termios *old_termios)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        if (tty->termios->c_cflag == old_termios->c_cflag)
                return;
 
        change_speed(info);
 
        if ((old_termios->c_cflag & CRTSCTS) &&
            !(tty->termios->c_cflag & CRTSCTS)) {
                tty->hw_stopped = 0;
                dz_start(tty);
        }
}
 
/*
 * ------------------------------------------------------------
 * dz_close()
 *
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we turn off
 * the transmit enable and receive enable flags.
 * ------------------------------------------------------------
 */
static void dz_close(struct tty_struct *tty, struct file *filp)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
        unsigned long flags;
 
        if (!info)
                return;
 
        save_flags(flags);
        cli();
 
        if (tty_hung_up_p(filp)) {
                restore_flags(flags);
                return;
        }
        if ((tty->count == 1) && (info->count != 1)) {
                /*
                 * Uh, oh.  tty->count is 1, which means that the tty
                 * structure will be freed.  Info->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("dz_close: bad serial port count; tty->count is 1, "
                       "info->count is %d\n", info->count);
                info->count = 1;
        }
        if (--info->count < 0) {
                printk("ds_close: bad serial port count for ttyS%02d: %d\n",
                       info->line, info->count);
                info->count = 0;
        }
        if (info->count) {
                restore_flags(flags);
                return;
        }
        info->flags |= DZ_CLOSING;
        /*
         * Save the termios structure, since this port may have
         * separate termios for callout and dialin.
         */
        if (info->flags & DZ_NORMAL_ACTIVE)
                info->normal_termios = *tty->termios;
        if (info->flags & DZ_CALLOUT_ACTIVE)
                info->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 != DZ_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.
         */
 
        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 (tty->ldisc.num != ldiscs[N_TTY].num) {
                if (tty->ldisc.close)
                        (tty->ldisc.close) (tty);
                tty->ldisc = ldiscs[N_TTY];
                tty->termios->c_line = N_TTY;
                if (tty->ldisc.open)
                        (tty->ldisc.open) (tty);
        }
        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 &= ~(DZ_NORMAL_ACTIVE | DZ_CALLOUT_ACTIVE | DZ_CLOSING);
        wake_up_interruptible(&info->close_wait);
 
        restore_flags(flags);
}
 
/*
 * dz_hangup () --- called by tty_hangup() when a hangup is signaled.
 */
static void dz_hangup(struct tty_struct *tty)
{
        struct dz_serial *info = (struct dz_serial *) tty->driver_data;
 
        dz_flush_buffer(tty);
        shutdown(info);
        info->event = 0;
        info->count = 0;
        info->flags &= ~(DZ_NORMAL_ACTIVE | DZ_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 dz_serial *info)
{
        DECLARE_WAITQUEUE(wait, current);
        int retval;
        int do_clocal = 0;
 
        /*
         * If the device is in the middle of being closed, then block
         * until it's done, and then try again.
         */
        if (info->flags & DZ_CLOSING) {
                interruptible_sleep_on(&info->close_wait);
                return -EAGAIN;
        }
        /*
         * 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 & DZ_NORMAL_ACTIVE)
                        return -EBUSY;
 
                if ((info->flags & DZ_CALLOUT_ACTIVE) &&
                    (info->flags & DZ_SESSION_LOCKOUT) &&
                    (info->session != current->session))
                        return -EBUSY;
 
                if ((info->flags & DZ_CALLOUT_ACTIVE) &&
                    (info->flags & DZ_PGRP_LOCKOUT) &&
                    (info->pgrp != current->pgrp))
                        return -EBUSY;
                info->flags |= DZ_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 & DZ_CALLOUT_ACTIVE)
                        return -EBUSY;
                info->flags |= DZ_NORMAL_ACTIVE;
                return 0;
        }
        if (info->flags & DZ_CALLOUT_ACTIVE) {
                if (info->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, info->count is dropped by one, so that
         * dz_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
        add_wait_queue(&info->open_wait, &wait);
 
        info->count--;
        info->blocked_open++;
        while (1) {
                set_current_state(TASK_INTERRUPTIBLE);
                if (tty_hung_up_p(filp) || !(info->is_initialized)) {
                        retval = -EAGAIN;
                        break;
                }
                if (!(info->flags & DZ_CALLOUT_ACTIVE) &&
                    !(info->flags & DZ_CLOSING) && do_clocal)
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }
                schedule();
        }
 
        current->state = TASK_RUNNING;
        remove_wait_queue(&info->open_wait, &wait);
        if (!tty_hung_up_p(filp))
                info->count++;
        info->blocked_open--;
 
        if (retval)
                return retval;
        info->flags |= DZ_NORMAL_ACTIVE;
        return 0;
}
 
/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port. It also performs the
 * serial-specific initialization for the tty structure.
 */
static int dz_open(struct tty_struct *tty, struct file *filp)
{
        struct dz_serial *info;
        int retval, line;
 
        line = MINOR(tty->device) - tty->driver.minor_start;
 
        /* The dz lines for the mouse/keyboard must be
         * opened using their respective drivers.
         */
        if ((line < 0) || (line >= DZ_NB_PORT))
                return -ENODEV;
 
        if ((line == DZ_KEYBOARD) || (line == DZ_MOUSE))
                return -ENODEV;
 
        info = lines[line];
        info->count++;
 
        tty->driver_data = info;
        info->tty = tty;
 
        /*
         * Start up serial port
         */
        retval = startup(info);
        if (retval)
                return retval;
 
        retval = block_til_ready(tty, filp, info);
        if (retval)
                return retval;
 
        if ((info->count == 1) && (info->flags & DZ_SPLIT_TERMIOS)) {
                if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
                        *tty->termios = info->normal_termios;
                else
                        *tty->termios = info->callout_termios;
                change_speed(info);
 
        }
        info->session = current->session;
        info->pgrp = current->pgrp;
        return 0;
}
 
static void show_serial_version(void)
{
        printk("%s%s\n", dz_name, dz_version);
}
 
int __init dz_init(void)
{
        int i;
        long flags;
        struct dz_serial *info;
 
        /* Setup base handler, and timer table. */
        init_bh(SERIAL_BH, do_serial_bh);
 
        show_serial_version();
 
        memset(&serial_driver, 0, sizeof(struct tty_driver));
        serial_driver.magic = TTY_DRIVER_MAGIC;
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
        serial_driver.name = "ttyS";
#else
        serial_driver.name = "tts/%d";
#endif
        serial_driver.major = TTY_MAJOR;
        serial_driver.minor_start = 64;
        serial_driver.num = DZ_NB_PORT;
        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 = dz_open;
        serial_driver.close = dz_close;
        serial_driver.write = dz_write;
        serial_driver.flush_chars = dz_flush_chars;
        serial_driver.write_room = dz_write_room;
        serial_driver.chars_in_buffer = dz_chars_in_buffer;
        serial_driver.flush_buffer = dz_flush_buffer;
        serial_driver.ioctl = dz_ioctl;
        serial_driver.throttle = dz_throttle;
        serial_driver.unthrottle = dz_unthrottle;
        serial_driver.send_xchar = dz_send_xchar;
        serial_driver.set_termios = dz_set_termios;
        serial_driver.stop = dz_stop;
        serial_driver.start = dz_start;
        serial_driver.hangup = dz_hangup;
 
        /*
         * 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";
#else
        callout_driver.name = "cua/%d";
#endif
        callout_driver.major = TTYAUX_MAJOR;
        callout_driver.subtype = SERIAL_TYPE_CALLOUT;
 
        if (tty_register_driver(&serial_driver))
                panic("Couldn't register serial driver");
        if (tty_register_driver(&callout_driver))
                panic("Couldn't register callout driver");
        save_flags(flags);
        cli();
 
        for (i = 0; i < DZ_NB_PORT; i++) {
                info = &multi[i];
                lines[i] = info;
                info->magic = SERIAL_MAGIC;
 
                if (mips_machtype == MACH_DS23100 ||
                    mips_machtype == MACH_DS5100)
                        info->port = (unsigned long) KN01_DZ11_BASE;
                else
                        info->port = (unsigned long) KN02_DZ11_BASE;
 
                info->line = i;
                info->tty = 0;
                info->close_delay = 50;
                info->closing_wait = 3000;
                info->x_char = 0;
                info->event = 0;
                info->count = 0;
                info->blocked_open = 0;
                info->tqueue.routine = do_softint;
                info->tqueue.data = info;
                info->tqueue_hangup.routine = do_serial_hangup;
                info->tqueue_hangup.data = info;
                info->callout_termios = callout_driver.init_termios;
                info->normal_termios = serial_driver.init_termios;
                init_waitqueue_head(&info->open_wait);
                init_waitqueue_head(&info->close_wait);
 
                /*
                 * If we are pointing to address zero then punt - not correctly
                 * set up in setup.c to handle this.
                 */
                if (!info->port)
                        return 0;
 
                printk("ttyS%02d at 0x%08x (irq = %d)\n", info->line,
                       info->port, dec_interrupt[DEC_IRQ_DZ11]);
 
                tty_register_devfs(&serial_driver, 0,
                                 serial_driver.minor_start + info->line);
                tty_register_devfs(&callout_driver, 0,
                                callout_driver.minor_start + info->line);
        }
 
        /* reset the chip */
#ifndef CONFIG_SERIAL_DEC_CONSOLE
        dz_out(info, DZ_CSR, DZ_CLR);
        while (dz_in(info, DZ_CSR) & DZ_CLR);
        iob();
 
        /* enable scanning */
        dz_out(info, DZ_CSR, DZ_MSE);
#endif
 
        /* order matters here... the trick is that flags
           is updated... in request_irq - to immediatedly obliterate
           it is unwise. */
        restore_flags(flags);
 
 
        if (request_irq(dec_interrupt[DEC_IRQ_DZ11], dz_interrupt,
                        SA_INTERRUPT, "DZ", lines[0]))
                panic("Unable to register DZ interrupt");
 
        return 0;
}
 
#ifdef CONFIG_SERIAL_DEC_CONSOLE
static void dz_console_put_char(unsigned char ch)
{
        unsigned long flags;
        int loops = 2500;
        unsigned short tmp = ch;
        /* this code sends stuff out to serial device - spinning its
           wheels and waiting. */
 
        /* force the issue - point it at lines[3] */
        dz_console = &multi[CONSOLE_LINE];
 
        save_flags(flags);
        cli();
 
 
        /* spin our wheels */
        while (((dz_in(dz_console, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--);
 
        /* Actually transmit the character. */
        dz_out(dz_console, DZ_TDR, tmp);
 
        restore_flags(flags);
}
/*
 * -------------------------------------------------------------------
 * dz_console_print ()
 *
 * dz_console_print is registered for printk.
 * The console must be locked when we get here.
 * -------------------------------------------------------------------
 */
static void dz_console_print(struct console *cons,
                             const char *str,
                             unsigned int count)
{
#ifdef DEBUG_DZ
        prom_printf((char *) str);
#endif
        while (count--) {
                if (*str == '\n')
                        dz_console_put_char('\r');
                dz_console_put_char(*str++);
        }
}
 
static kdev_t dz_console_device(struct console *c)
{
        return MKDEV(TTY_MAJOR, 64 + c->index);
}
 
static int __init dz_console_setup(struct console *co, char *options)
{
        int baud = 9600;
        int bits = 8;
        int parity = 'n';
        int cflag = CREAD | HUPCL | CLOCAL;
        char *s;
        unsigned short mask, tmp;
 
        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 |= DZ_B1200;
                break;
        case 2400:
                cflag |= DZ_B2400;
                break;
        case 4800:
                cflag |= DZ_B4800;
                break;
        case 9600:
        default:
                cflag |= DZ_B9600;
                break;
        }
        switch (bits) {
        case 7:
                cflag |= DZ_CS7;
                break;
        default:
        case 8:
                cflag |= DZ_CS8;
                break;
        }
        switch (parity) {
        case 'o':
        case 'O':
                cflag |= DZ_PARODD;
                break;
        case 'e':
        case 'E':
                cflag |= DZ_PARENB;
                break;
        }
        co->cflag = cflag;
 
        /* TOFIX: force to console line */
        dz_console = &multi[CONSOLE_LINE];
        if ((mips_machtype == MACH_DS23100) || (mips_machtype == MACH_DS5100))
                dz_console->port = KN01_DZ11_BASE;
        else
                dz_console->port = KN02_DZ11_BASE;
        dz_console->line = CONSOLE_LINE;
 
        dz_out(dz_console, DZ_CSR, DZ_CLR);
        while ((tmp = dz_in(dz_console, DZ_CSR)) & DZ_CLR);
 
        /* enable scanning */
        dz_out(dz_console, DZ_CSR, DZ_MSE);
 
        /*  Set up flags... */
        dz_console->cflags = 0;
        dz_console->cflags |= DZ_B9600;
        dz_console->cflags |= DZ_CS8;
        dz_console->cflags |= DZ_PARENB;
        dz_out(dz_console, DZ_LPR, dz_console->cflags);
 
        mask = 1 << dz_console->line;
        tmp = dz_in(dz_console, DZ_TCR);        /* read the TX flag */
        if (!(tmp & mask)) {
                tmp |= mask;    /* set the TX flag */
                dz_out(dz_console, DZ_TCR, tmp);
        }
        return 0;
}
 
static struct console dz_sercons =
{
    .name       = "ttyS",
    .write      = dz_console_print,
    .device     = dz_console_device,
    .setup      = dz_console_setup,
    .flags      = CON_CONSDEV | CON_PRINTBUFFER,
    .index      = CONSOLE_LINE,
};
 
void __init dz_serial_console_init(void)
{
        register_console(&dz_sercons);
}
 
#endif /* CONFIG_SERIAL_DEC_CONSOLE */
 
MODULE_LICENSE("GPL");
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [dz.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* dz.c: Serial port driver for DECStations equiped`
3			`* with the DZ chipset.`
4			`*`
5			`* Copyright (C) 1998 Olivier A. D. Lebaillif`
6			`*`
7			`* Email: olivier.lebaillif@ifrsys.com`
8			`*`
9			`* [31-AUG-98] triemer`
10			`* Changed IRQ to use Harald's dec internals interrupts.h`
11			`* removed base_addr code - moving address assignment to setup.c`
12			`* Changed name of dz_init to rs_init to be consistent with tc code`
13			`* [13-NOV-98] triemer fixed code to receive characters`
14			`* after patches by harald to irq code.`
15			`* [09-JAN-99] triemer minor fix for schedule - due to removal of timeout`
16			`* field from "current" - somewhere between 2.1.121 and 2.1.131`
17			`Qua Jun 27 15:02:26 BRT 2001`
18			`* [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups`
19			`*`
20			`* Parts (C) 1999 David Airlie, airlied@linux.ie`
21			`* [07-SEP-99] Bugfixes`
22			`*/`
23
24			`#undef DEBUG_DZ`
25
26			`#include <linux/config.h>`
27			`#include <linux/version.h>`
28			`#include <linux/kernel.h>`
29			`#include <linux/sched.h>`
30			`#include <linux/init.h>`
31			`#include <linux/slab.h>`
32			`#include <linux/mm.h>`
33			`#include <linux/major.h>`
34			`#include <linux/module.h>`
35			`#include <linux/param.h>`
36			`#include <linux/tqueue.h>`
37			`#include <linux/interrupt.h>`
38
39			`#include <linux/console.h>`
40			`#include <linux/tty.h>`