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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sbus/] [char/] [sunserial.c] - Blame information for rev 1765

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/* serial.c: Serial port driver for the Sparc.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */
 
#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/config.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/kernel.h>
 
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/bitops.h>
#include <asm/delay.h>
#include <asm/kdebug.h>
 
#include "sunserial.h"
 
#define NUM_SERIAL 2     /* Two chips on board. */
#define NUM_CHANNELS (NUM_SERIAL * 2)
 
#define KEYBOARD_LINE 0x2
#define MOUSE_LINE    0x3
 
struct sun_zslayout *zs_chips[NUM_SERIAL] = { 0, 0, };
struct sun_zschannel *zs_channels[NUM_CHANNELS] = { 0, 0, 0, 0, };
struct sun_zschannel *zs_conschan;
struct sun_zschannel *zs_mousechan;
struct sun_zschannel *zs_kbdchan;
struct sun_zschannel *zs_kgdbchan;
int zs_nodes[NUM_SERIAL] = { 0, 0, };
 
struct sun_serial zs_soft[NUM_CHANNELS];
struct sun_serial *zs_chain;  /* IRQ servicing chain */
int zilog_irq;
 
struct tty_struct zs_ttys[NUM_CHANNELS];
/** struct tty_struct *zs_constty; **/
 
/* Console hooks... */
static int zs_cons_chanout = 0;
static int zs_cons_chanin = 0;
static struct l1a_kbd_state l1a_state = { 0, 0 };
struct sun_serial *zs_consinfo = 0;
 
/* Keyboard defines for L1-A processing... */
#define SUNKBD_RESET   0xff
#define SUNKBD_L1      0x01
#define SUNKBD_UP      0x80
#define SUNKBD_A       0x4d
 
extern void sunkbd_inchar(unsigned char ch, unsigned char status, struct pt_regs *regs);
extern void sun_mouse_inbyte(unsigned char byte, unsigned char status);
 
static unsigned char kgdb_regs[16] = {
        0, 0, 0,                     /* write 0, 1, 2 */
        (Rx8 | RxENABLE),            /* write 3 */
        (X16CLK | SB1 | PAR_EVEN),   /* write 4 */
        (Tx8 | TxENAB),              /* write 5 */
        0, 0, 0,                     /* write 6, 7, 8 */
        (NV),                        /* write 9 */
        (NRZ),                       /* write 10 */
        (TCBR | RCBR),               /* write 11 */
        0, 0,                        /* BRG time constant, write 12 + 13 */
        (BRSRC | BRENABL),           /* write 14 */
        (DCDIE)                      /* write 15 */
};
 
#define ZS_CLOCK         4915200   /* Zilog input clock rate */
 
DECLARE_TASK_QUEUE(tq_serial);
 
struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
 
/* serial subtype definitions */
#define SERIAL_TYPE_NORMAL      1
#define SERIAL_TYPE_CALLOUT     2
 
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
 
/* Debugging... DEBUG_INTR is bad to use when one of the zs
 * lines is your console ;(
 */
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
 
#define RS_STROBE_TIME 10
#define RS_ISR_PASS_LIMIT 256
 
#define _INLINE_ inline
 
static void change_speed(struct sun_serial *info);
 
static struct tty_struct *serial_table[NUM_CHANNELS];
static struct termios *serial_termios[NUM_CHANNELS];
static struct termios *serial_termios_locked[NUM_CHANNELS];
 
#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 memcpy_fromfs 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[4096]; /* This is cheating */
static struct semaphore tmp_buf_sem = MUTEX;
 
static inline int serial_paranoia_check(struct sun_serial *info,
                                        dev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
        static const char *badmagic =
                "Warning: bad magic number for serial struct (%d, %d) in %s\n";
        static const char *badinfo =
                "Warning: null sun_serial for (%d, %d) in %s\n";
 
        if (!info) {
                printk(badinfo, MAJOR(device), MINOR(device), routine);
                return 1;
        }
        if (info->magic != SERIAL_MAGIC) {
                printk(badmagic, MAJOR(device), MINOR(device), routine);
                return 1;
        }
#endif
        return 0;
}
 
/*
 * This is used to figure out the divisor speeds and the timeouts
 */
static int baud_table[] = {
        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
        9600, 19200, 38400, 57600, 115200, 0 };
 
/*
 * Reading and writing Zilog8530 registers.  The delays are to make this
 * driver work on the Sun4 which needs a settling delay after each chip
 * register access, other machines handle this in hardware via auxiliary
 * flip-flops which implement the settle time we do in software.
 */
static inline unsigned char read_zsreg(struct sun_zschannel *channel, unsigned char reg)
{
        unsigned char retval;
 
        channel->control = reg;
        udelay(5);
        retval = channel->control;
        udelay(5);
        return retval;
}
 
static inline void write_zsreg(struct sun_zschannel *channel, unsigned char reg, unsigned char value)
{
        channel->control = reg;
        udelay(5);
        channel->control = value;
        udelay(5);
        return;
}
 
static inline void load_zsregs(struct sun_zschannel *channel, unsigned char *regs)
{
        ZS_CLEARERR(channel);
        ZS_CLEARFIFO(channel);
        /* Load 'em up */
        write_zsreg(channel, R4, regs[R4]);
        write_zsreg(channel, R10, regs[R10]);
        write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
        write_zsreg(channel, R5, regs[R5] & ~TxENAB);
        write_zsreg(channel, R1, regs[R1]);
        write_zsreg(channel, R9, regs[R9]);
        write_zsreg(channel, R11, regs[R11]);
        write_zsreg(channel, R12, regs[R12]);
        write_zsreg(channel, R13, regs[R13]);
        write_zsreg(channel, R14, regs[R14]);
        write_zsreg(channel, R15, regs[R15]);
        write_zsreg(channel, R3, regs[R3]);
        write_zsreg(channel, R5, regs[R5]);
        return;
}
 
/* Sets or clears DTR/RTS on the requested line */
static inline void zs_rtsdtr(struct sun_serial *ss, int set)
{
        if(set) {
                ss->curregs[5] |= (RTS | DTR);
                ss->pendregs[5] = ss->curregs[5];
                write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
        } else {
                ss->curregs[5] &= ~(RTS | DTR);
                ss->pendregs[5] = ss->curregs[5];
                write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
        }
        return;
}
 
static inline void kgdb_chaninit(struct sun_serial *ss, int intson, int bps)
{
        int brg;
 
        if(intson) {
                kgdb_regs[R1] = INT_ALL_Rx;
                kgdb_regs[R9] |= MIE;
        } else {
                kgdb_regs[R1] = 0;
                kgdb_regs[R9] &= ~MIE;
        }
        brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
        kgdb_regs[R12] = (brg & 255);
        kgdb_regs[R13] = ((brg >> 8) & 255);
        load_zsregs(ss->zs_channel, kgdb_regs);
}
 
/* Utility routines for the Zilog */
static inline int get_zsbaud(struct sun_serial *ss)
{
        struct sun_zschannel *channel = ss->zs_channel;
        int brg;
 
        /* The baud rate is split up between two 8-bit registers in
         * what is termed 'BRG time constant' format in my docs for
         * the chip, it is a function of the clk rate the chip is
         * receiving which happens to be constant.
         */
        brg = ((read_zsreg(channel, 13)&0xff) << 8);
        brg |= (read_zsreg(channel, 12)&0xff);
        return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
}
 
/*
 * ------------------------------------------------------------
 * 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 sun_serial *info = (struct sun_serial *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_stop"))
                return;
 
        save_flags(flags); cli();
        if (info->curregs[5] & TxENAB) {
                info->curregs[5] &= ~TxENAB;
                info->pendregs[5] &= ~TxENAB;
                write_zsreg(info->zs_channel, 5, info->curregs[5]);
        }
        restore_flags(flags);
}
 
static void rs_start(struct tty_struct *tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_start"))
                return;
 
        save_flags(flags); cli();
        if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
                info->curregs[5] |= TxENAB;
                info->pendregs[5] = info->curregs[5];
                write_zsreg(info->zs_channel, 5, info->curregs[5]);
        }
        restore_flags(flags);
}
 
/* Drop into either the boot monitor or kadb upon receiving a break
 * from keyboard/console input.
 */
static void batten_down_hatches(void)
{
        /* If we are doing kadb, we call the debugger
         * else we just drop into the boot monitor.
         * Note that we must flush the user windows
         * first before giving up control.
         */
        printk("\n");
        flush_user_windows();
        if((((unsigned long)linux_dbvec)>=DEBUG_FIRSTVADDR) &&
           (((unsigned long)linux_dbvec)<=DEBUG_LASTVADDR))
                sp_enter_debugger();
        else
                prom_halt();
 
        /* XXX We want to notify the keyboard driver that all
         * XXX keys are in the up state or else weird things
         * XXX happen...
         */
 
        return;
}
 
/* On receive, this clears errors and the receiver interrupts */
static inline void rs_recv_clear(struct sun_zschannel *zsc)
{
        zsc->control = ERR_RES;
        udelay(5);
        zsc->control = RES_H_IUS;
        udelay(5);
}
 
/*
 * ----------------------------------------------------------------------
 *
 * 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 sun_serial *info,
                                  int event)
{
        info->event |= 1 << event;
        queue_task_irq_off(&info->tqueue, &tq_serial);
        mark_bh(SERIAL_BH);
}
 
extern void breakpoint(void);  /* For the KGDB frame character */
 
static _INLINE_ void receive_chars(struct sun_serial *info, struct pt_regs *regs)
{
        struct tty_struct *tty = info->tty;
        unsigned char ch, stat;
 
        ch = info->zs_channel->data;
        udelay(5);
        stat = read_zsreg(info->zs_channel, R1);
        udelay(5);
 
        /* If this is the console keyboard, we need to handle
         * L1-A's here.
         */
        if(info->cons_keyb) {
                if(ch == SUNKBD_RESET) {
                        l1a_state.kbd_id = 1;
                        l1a_state.l1_down = 0;
                } else if(l1a_state.kbd_id) {
                        l1a_state.kbd_id = 0;
                } else if(ch == SUNKBD_L1) {
                        l1a_state.l1_down = 1;
                } else if(ch == (SUNKBD_L1|SUNKBD_UP)) {
                        l1a_state.l1_down = 0;
                } else if(ch == SUNKBD_A && l1a_state.l1_down) {
                        /* whee... */
                        batten_down_hatches();
                        /* Clear the line and continue execution... */
                        rs_recv_clear(info->zs_channel);
                        l1a_state.l1_down = 0;
                        l1a_state.kbd_id = 0;
                        return;
                }
                rs_recv_clear(info->zs_channel);
                sunkbd_inchar(ch, stat, regs);
 
                return;
        }
        if(info->cons_mouse) {
                rs_recv_clear(info->zs_channel);
                sun_mouse_inbyte(ch, stat);
                return;
        }
        if(info->is_cons) {
                if(ch==0) { /* whee, break received */
                        batten_down_hatches();
                        rs_recv_clear(info->zs_channel);
                        return;
                } else if (ch == 1) {
                        show_state();
                        return;
                } else if (ch == 2) {
                        show_buffers();
                        return;
                }
                /* It is a 'keyboard interrupt' ;-) */
                wake_up(&keypress_wait);
        }
        /* Look for kgdb 'stop' character, consult the gdb documentation
         * for remote target debugging and arch/sparc/kernel/sparc-stub.c
         * to see how all this works.
         */
        if((info->kgdb_channel) && (ch =='\003')) {
                breakpoint();
                goto clear_and_exit;
        }
 
        if(!tty)
                goto clear_and_exit;
 
        if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
        tty->flip.count++;
        if(stat & PAR_ERR)
                *tty->flip.flag_buf_ptr++ = TTY_PARITY;
        else if(stat & Rx_OVR)
                *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
        else if(stat & CRC_ERR)
                *tty->flip.flag_buf_ptr++ = TTY_FRAME;
        else
                *tty->flip.flag_buf_ptr++ = 0; /* XXX */
        *tty->flip.char_buf_ptr++ = ch;
 
        queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
 
clear_and_exit:
        rs_recv_clear(info->zs_channel);
        return;
}
 
static _INLINE_ void transmit_chars(struct sun_serial *info)
{
        /* P3: In theory we have to test readiness here because a
         * serial console can clog the chip through rs_put_char().
         * David did not do this. I think he relies on 3-chars FIFO in 8530.
         * Let's watch for lost _output_ characters. XXX
         */
 
        if (info->x_char) {
                /* Send next char */
                info->zs_channel->data = info->x_char;
                udelay(5);
                info->x_char = 0;
                goto clear_and_return;
        }
 
        if((info->xmit_cnt <= 0) || info->tty->stopped) {
                /* That's peculiar... */
                info->zs_channel->control = RES_Tx_P;
                udelay(5);
                goto clear_and_return;
        }
 
        /* Send char */
        info->zs_channel->data = info->xmit_buf[info->xmit_tail++];
        udelay(5);
        info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
        info->xmit_cnt--;
 
        if (info->xmit_cnt < WAKEUP_CHARS)
                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 
        if(info->xmit_cnt <= 0) {
                info->zs_channel->control = RES_Tx_P;
                udelay(5);
                goto clear_and_return;
        }
 
clear_and_return:
        /* Clear interrupt */
        info->zs_channel->control = RES_H_IUS;
        udelay(5);
        return;
}
 
static _INLINE_ void status_handle(struct sun_serial *info)
{
        unsigned char status;
 
        /* Get status from Read Register 0 */
        status = info->zs_channel->control;
        udelay(5);
        /* Clear status condition... */
        info->zs_channel->control = RES_EXT_INT;
        udelay(5);
        /* Clear the interrupt */
        info->zs_channel->control = RES_H_IUS;
        udelay(5);
 
#if 0
        if(status & DCD) {
                if((info->tty->termios->c_cflag & CRTSCTS) &&
                   ((info->curregs[3] & AUTO_ENAB)==0)) {
                        info->curregs[3] |= AUTO_ENAB;
                        info->pendregs[3] |= AUTO_ENAB;
                        write_zsreg(info->zs_channel, 3, info->curregs[3]);
                }
        } else {
                if((info->curregs[3] & AUTO_ENAB)) {
                        info->curregs[3] &= ~AUTO_ENAB;
                        info->pendregs[3] &= ~AUTO_ENAB;
                        write_zsreg(info->zs_channel, 3, info->curregs[3]);
                }
        }
#endif
        /* Whee, if this is console input and this is a
         * 'break asserted' status change interrupt, call
         * the boot prom.
         */
        if((status & BRK_ABRT) && info->break_abort)
                batten_down_hatches();
 
        /* XXX Whee, put in a buffer somewhere, the status information
         * XXX whee whee whee... Where does the information go...
         */
        return;
}
 
/*
 * This is the serial driver's generic interrupt routine
 */
void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
        struct sun_serial * info;
        unsigned char zs_intreg;
 
        info = zs_chain;
        if (!info)
                return;
 
        zs_intreg = read_zsreg(info->zs_channel, 3);
 
        /* NOTE: The read register 3, which holds the irq status,
         *       does so for both channels on each chip.  Although
         *       the status value itself must be read from the A
         *       channel and is only valid when read from channel A.
         *       Yes... broken hardware...
         */
#define CHAN_A_IRQMASK (CHARxIP | CHATxIP | CHAEXT)
#define CHAN_B_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
 
        /* *** Chip 1 *** */
        /* Channel A -- /dev/ttya, could be the console */
        if(zs_intreg & CHAN_A_IRQMASK) {
                if (zs_intreg & CHARxIP)
                        receive_chars(info, regs);
                if (zs_intreg & CHATxIP)
                        transmit_chars(info);
                if (zs_intreg & CHAEXT)
                        status_handle(info);
        }
 
        info=info->zs_next;
 
        /* Channel B -- /dev/ttyb, could be the console */
        if(zs_intreg & CHAN_B_IRQMASK) {
                if (zs_intreg & CHBRxIP)
                        receive_chars(info, regs);
                if (zs_intreg & CHBTxIP)
                        transmit_chars(info);
                if (zs_intreg & CHBEXT)
                        status_handle(info);
        }
 
        info = info->zs_next;
 
        zs_intreg = read_zsreg(info->zs_channel, 3);
        /* *** Chip 2 *** */
        /* Channel A -- /dev/kbd, pass communication to keyboard driver */
        if(zs_intreg & CHAN_A_IRQMASK) {
                if (zs_intreg & CHARxIP)
                        receive_chars(info, regs);
                if (zs_intreg & CHATxIP)
                        transmit_chars(info);
                if (zs_intreg & CHAEXT)
                        status_handle(info);
        }
 
        info=info->zs_next;
 
        /* Channel B -- /dev/mouse, pass communication to mouse driver */
        if(zs_intreg & CHAN_B_IRQMASK) {
                if (zs_intreg & CHBRxIP)
                        receive_chars(info, regs);
                if (zs_intreg & CHBTxIP)
                        transmit_chars(info);
                if (zs_intreg & CHBEXT)
                        status_handle(info);
        }
 
        return;
}
 
/*
 * -------------------------------------------------------------------
 * 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 sun_serial       *info = (struct sun_serial *) private_;
        struct tty_struct       *tty;
 
        tty = info->tty;
        if (!tty)
                return;
 
        if (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);
        }
}
 
/*
 * 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_)
{
        struct sun_serial       *info = (struct sun_serial *) private_;
        struct tty_struct       *tty;
 
        tty = info->tty;
        if (!tty)
                return;
 
        tty_hangup(tty);
}
 
 
/*
 * 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 at all for 16450's, as a sun has a Z8530.
 */
 
static void rs_timer(void)
{
        printk("rs_timer called\n");
        prom_halt();
        return;
}
 
static int startup(struct sun_serial * info)
{
        unsigned long flags;
 
        if (info->flags & ZILOG_INITIALIZED)
                return 0;
 
        if (!info->xmit_buf) {
                info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL);
                if (!info->xmit_buf)
                        return -ENOMEM;
        }
 
        save_flags(flags); cli();
 
#ifdef SERIAL_DEBUG_OPEN
        printk("starting up ttys%d (irq %d)...", info->line, info->irq);
#endif
 
        /*
         * Clear the FIFO buffers and disable them
         * (they will be reenabled in change_speed())
         */
        ZS_CLEARFIFO(info->zs_channel);
        info->xmit_fifo_size = 1;
 
        /*
         * Clear the interrupt registers.
         */
        info->zs_channel->control = ERR_RES;
        udelay(5);
        info->zs_channel->control = RES_H_IUS;
        udelay(5);
 
        /*
         * Now, initialize the Zilog
         */
        zs_rtsdtr(info, 1);
 
        /*
         * Finally, enable sequencing and interrupts
         */
        info->curregs[1] |= (info->curregs[1] & ~0x18) | (EXT_INT_ENAB|INT_ALL_Rx);
        info->pendregs[1] = info->curregs[1];
        info->curregs[3] |= (RxENABLE | Rx8);
        info->pendregs[3] = info->curregs[3];
        /* We enable Tx interrupts as needed. */
        info->curregs[5] |= (TxENAB | Tx8);
        info->pendregs[5] = info->curregs[5];
        info->curregs[9] |= (NV | MIE);
        info->pendregs[9] = info->curregs[9];
        write_zsreg(info->zs_channel, 3, info->curregs[3]);
        write_zsreg(info->zs_channel, 5, info->curregs[5]);
        write_zsreg(info->zs_channel, 9, info->curregs[9]);
 
        /*
         * And clear the interrupt registers again for luck.
         */
        info->zs_channel->control = ERR_RES;
        udelay(5);
        info->zs_channel->control = RES_H_IUS;
        udelay(5);
 
        if (info->tty)
                clear_bit(TTY_IO_ERROR, &info->tty->flags);
        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 
        /*
         * Set up serial timers...
         */
#if 0  /* Works well and stops the machine. */
        timer_table[RS_TIMER].expires = jiffies + 2;
        timer_active |= 1 << RS_TIMER;
#endif
 
        /*
         * and set the speed of the serial port
         */
        change_speed(info);
 
        info->flags |= ZILOG_INITIALIZED;
        restore_flags(flags);
        return 0;
}
 
/*
 * 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 sun_serial * info)
{
        unsigned long   flags;
 
        if (!(info->flags & ZILOG_INITIALIZED))
                return;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("Shutting down serial port %d (irq %d)....", info->line,
               info->irq);
#endif
 
        save_flags(flags); cli(); /* Disable interrupts */
 
        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 &= ~ZILOG_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 sun_serial *info)
{
        unsigned short port;
        unsigned cflag;
        int     i;
        int     brg;
 
        if (!info->tty || !info->tty->termios)
                return;
        cflag = info->tty->termios->c_cflag;
        if (!(port = info->port))
                return;
        i = cflag & CBAUD;
        if (i & CBAUDEX) {
                /* XXX CBAUDEX is not obeyed.
                 * It is impossible at a 32bits SPARC.
                 * But we have to report this to user ... someday.
                 */
                i = B9600;
        }
        info->zs_baud = baud_table[i];
        info->clk_divisor = 16;
 
        info->curregs[4] = X16CLK;
        info->curregs[11] = TCBR | RCBR;
        brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
        info->curregs[12] = (brg & 255);
        info->curregs[13] = ((brg >> 8) & 255);
        info->curregs[14] = BRSRC | BRENABL;
 
        /* byte size and parity */
        switch (cflag & CSIZE) {
        case CS5:
                info->curregs[3] &= ~(0xc0);
                info->curregs[3] |= Rx5;
                info->pendregs[3] = info->curregs[3];
                info->curregs[5] &= ~(0xe0);
                info->curregs[5] |= Tx5;
                info->pendregs[5] = info->curregs[5];
                break;
        case CS6:
                info->curregs[3] &= ~(0xc0);
                info->curregs[3] |= Rx6;
                info->pendregs[3] = info->curregs[3];
                info->curregs[5] &= ~(0xe0);
                info->curregs[5] |= Tx6;
                info->pendregs[5] = info->curregs[5];
                break;
        case CS7:
                info->curregs[3] &= ~(0xc0);
                info->curregs[3] |= Rx7;
                info->pendregs[3] = info->curregs[3];
                info->curregs[5] &= ~(0xe0);
                info->curregs[5] |= Tx7;
                info->pendregs[5] = info->curregs[5];
                break;
        case CS8:
        default: /* defaults to 8 bits */
                info->curregs[3] &= ~(0xc0);
                info->curregs[3] |= Rx8;
                info->pendregs[3] = info->curregs[3];
                info->curregs[5] &= ~(0xe0);
                info->curregs[5] |= Tx8;
                info->pendregs[5] = info->curregs[5];
                break;
        }
        info->curregs[4] &= ~(0x0c);
        if (cflag & CSTOPB) {
                info->curregs[4] |= SB2;
        } else {
                info->curregs[4] |= SB1;
        }
        info->pendregs[4] = info->curregs[4];
        if (cflag & PARENB) {
                info->curregs[4] |= PAR_ENA;
                info->pendregs[4] |= PAR_ENA;
        } else {
                info->curregs[4] &= ~PAR_ENA;
                info->pendregs[4] &= ~PAR_ENA;
        }
        if (!(cflag & PARODD)) {
                info->curregs[4] |= PAR_EVEN;
                info->pendregs[4] |= PAR_EVEN;
        } else {
                info->curregs[4] &= ~PAR_EVEN;
                info->pendregs[4] &= ~PAR_EVEN;
        }
 
        /* Load up the new values */
        load_zsregs(info->zs_channel, info->curregs);
 
        return;
}
 
/* This is for mouse/keyboard output.
 * XXX mouse output??? can we send it commands??? XXX
 */
void kbd_put_char(unsigned char ch)
{
        struct sun_zschannel *chan = zs_kbdchan;
        int flags, loops = 0;
 
        if(!chan)
                return;
 
        save_flags(flags); cli();
        while((chan->control & Tx_BUF_EMP)==0 && loops < 10000) {
                loops++;
                udelay(5);
        }
 
        chan->data = ch;
        udelay(5);
        restore_flags(flags);
}
 
void mouse_put_char(char ch)
{
        struct sun_zschannel *chan = zs_mousechan;
        int flags, loops = 0;
 
        if(!chan)
                return;
 
        save_flags(flags); cli();
        while((chan->control & Tx_BUF_EMP)==0 && loops < 10000) {
                loops++;
                udelay(5);
        }
 
        chan->data = ch;
        udelay(5);
        restore_flags(flags);
}
 
 
/* This is for console output over ttya/ttyb */
static void rs_put_char(char ch)
{
        struct sun_zschannel *chan = zs_conschan;
        int flags, loops = 0;
 
        if(!chan)
                return;
 
        save_flags(flags); cli();
        while((chan->control & Tx_BUF_EMP)==0 && loops < 10000) {
                loops++;
                udelay(5);
        }
 
        chan->data = ch;
        udelay(5);
        restore_flags(flags);
}
 
/* These are for receiving and sending characters under the kgdb
 * source level kernel debugger.
 */
void putDebugChar(char kgdb_char)
{
        struct sun_zschannel *chan = zs_kgdbchan;
 
        while((chan->control & Tx_BUF_EMP)==0)
                udelay(5);
 
        chan->data = kgdb_char;
}
 
char getDebugChar(void)
{
        struct sun_zschannel *chan = zs_kgdbchan;
 
        while((chan->control & Rx_CH_AV)==0)
                barrier();
        return chan->data;
}
 
/*
 * Fair output driver allows a process to speak.
 */
static void rs_fair_output(void)
{
        int left;               /* Output no more than that */
        unsigned long flags;
        struct sun_serial *info = zs_consinfo;
        char c;
 
        if (info == 0) return;
        if (info->xmit_buf == 0) return;
 
        save_flags(flags);  cli();
        left = info->xmit_cnt;
        while (left != 0) {
                c = info->xmit_buf[info->xmit_tail];
                info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
                info->xmit_cnt--;
                restore_flags(flags);
 
                rs_put_char(c);
 
                save_flags(flags);  cli();
                left = MIN(info->xmit_cnt, left-1);
        }
 
        /* Last character is being transmitted now (hopefully). */
        zs_conschan->control = RES_Tx_P;
        udelay(5);
 
        restore_flags(flags);
        return;
}
 
/*
 * zs_console_print is registered for printk.
 */
static void zs_console_print(const char *p)
{
        char c;
 
        while((c=*(p++)) != 0) {
                if(c == '\n')
                        rs_put_char('\r');
                rs_put_char(c);
        }
 
        /* Comment this if you want to have a strict interrupt-driven output */
        rs_fair_output();
 
        return;
}
 
static void rs_flush_chars(struct tty_struct *tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
                return;
 
        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
            !info->xmit_buf)
                return;
 
        /* Enable transmitter */
        save_flags(flags); cli();
        info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
        info->pendregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
        write_zsreg(info->zs_channel, 1, info->curregs[1]);
        info->curregs[5] |= TxENAB;
        info->pendregs[5] |= TxENAB;
        write_zsreg(info->zs_channel, 5, info->curregs[5]);
 
        /*
         * Send a first (bootstrapping) character. A best solution is
         * to call transmit_chars() here which handles output in a
         * generic way. Current transmit_chars() not only transmits,
         * but resets interrupts also what we do not desire here.
         * XXX Discuss with David.
         */
        if (info->zs_channel->control & Tx_BUF_EMP) {
                /* Send char */
                info->zs_channel->data = info->xmit_buf[info->xmit_tail++];
                udelay(5);
                info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
                info->xmit_cnt--;
        }
        restore_flags(flags);
}
 
static int rs_write(struct tty_struct * tty, int from_user,
                    const unsigned char *buf, int count)
{
        int     c, total = 0;
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_write"))
                return 0;
 
        if (!tty || !info->xmit_buf)
                return 0;
 
        save_flags(flags);
        while (1) {
                cli();
                c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
                                   SERIAL_XMIT_SIZE - info->xmit_head));
                if (c <= 0)
                        break;
 
                if (from_user) {
                        down(&tmp_buf_sem);
                        memcpy_fromfs(tmp_buf, buf, c);
                        c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
                                       SERIAL_XMIT_SIZE - info->xmit_head));
                        memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
                        up(&tmp_buf_sem);
                } else
                        memcpy(info->xmit_buf + info->xmit_head, buf, c);
                info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
                info->xmit_cnt += c;
                restore_flags(flags);
                buf += c;
                count -= c;
                total += c;
        }
        if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
            !(info->curregs[5] & TxENAB)) {
                /* Enable transmitter */
                info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
                info->pendregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
                write_zsreg(info->zs_channel, 1, info->curregs[1]);
                info->curregs[5] |= TxENAB;
                info->pendregs[5] |= TxENAB;
                write_zsreg(info->zs_channel, 5, info->curregs[5]);
        }
        restore_flags(flags);
        return total;
}
 
static int rs_write_room(struct tty_struct *tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
        int     ret;
 
        if (serial_paranoia_check(info, tty->device, "rs_write_room"))
                return 0;
        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
        if (ret < 0)
                ret = 0;
        return ret;
}
 
static int rs_chars_in_buffer(struct tty_struct *tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
                return 0;
        return info->xmit_cnt;
}
 
static void rs_flush_buffer(struct tty_struct *tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
                return;
        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);
}
 
/*
 * ------------------------------------------------------------
 * 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 sun_serial *info = (struct sun_serial *)tty->driver_data;
#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))
                info->x_char = STOP_CHAR(tty);
 
        /* Turn off RTS line */
        cli();
        info->curregs[5] &= ~RTS;
        info->pendregs[5] &= ~RTS;
        write_zsreg(info->zs_channel, 5, info->curregs[5]);
        sti();
}
 
static void rs_unthrottle(struct tty_struct * tty)
{
        struct sun_serial *info = (struct sun_serial *)tty->driver_data;
#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
                        info->x_char = START_CHAR(tty);
        }
 
        /* Assert RTS line */
        cli();
        info->curregs[5] |= RTS;
        info->pendregs[5] |= RTS;
        write_zsreg(info->zs_channel, 5, info->curregs[5]);
        sti();
}
 
/*
 * ------------------------------------------------------------
 * rs_ioctl() and friends
 * ------------------------------------------------------------
 */
 
static int get_serial_info(struct sun_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 = info->irq;
        tmp.flags = info->flags;
        tmp.baud_base = info->baud_base;
        tmp.close_delay = info->close_delay;
        tmp.closing_wait = info->closing_wait;
        tmp.custom_divisor = info->custom_divisor;
        memcpy_tofs(retinfo,&tmp,sizeof(*retinfo));
        return 0;
}
 
static int set_serial_info(struct sun_serial * info,
                           struct serial_struct * new_info)
{
        struct serial_struct new_serial;
        struct sun_serial old_info;
        int                     retval = 0;
 
        if (!new_info)
                return -EFAULT;
        memcpy_fromfs(&new_serial,new_info,sizeof(new_serial));
        old_info = *info;
 
        if (!suser()) {
                if ((new_serial.baud_base != info->baud_base) ||
                    (new_serial.type != info->type) ||
                    (new_serial.close_delay != info->close_delay) ||
                    ((new_serial.flags & ~ZILOG_USR_MASK) !=
                     (info->flags & ~ZILOG_USR_MASK)))
                        return -EPERM;
                info->flags = ((info->flags & ~ZILOG_USR_MASK) |
                               (new_serial.flags & ZILOG_USR_MASK));
                info->custom_divisor = new_serial.custom_divisor;
                goto check_and_exit;
        }
 
        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->flags = ((info->flags & ~ZILOG_FLAGS) |
                        (new_serial.flags & ZILOG_FLAGS));
        info->type = new_serial.type;
        info->close_delay = new_serial.close_delay;
        info->closing_wait = new_serial.closing_wait;
 
check_and_exit:
        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 sun_serial * info, unsigned int *value)
{
        unsigned char status;
 
        cli();
        status = info->zs_channel->control;
        sti();
        put_user(status,value);
        return 0;
}
 
/*
 * This routine sends a break character out the serial port.
 */
static void send_break( struct sun_serial * info, int duration)
{
        if (!info->port)
                return;
        current->state = TASK_INTERRUPTIBLE;
        current->timeout = jiffies + duration;
        cli();
        write_zsreg(info->zs_channel, 5, (info->curregs[5] | SND_BRK));
        schedule();
        write_zsreg(info->zs_channel, 5, info->curregs[5]);
        sti();
}
 
static int rs_ioctl(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg)
{
        int error;
        struct sun_serial * info = (struct sun_serial *)tty->driver_data;
        int retval;
 
        if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
                return -ENODEV;
 
        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:
                        error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
                        if (error)
                                return error;
                        put_fs_long(C_CLOCAL(tty) ? 1 : 0,
                                    (unsigned long *) arg);
                        return 0;
                case TIOCSSOFTCAR:
                        arg = get_fs_long((unsigned long *) arg);
                        tty->termios->c_cflag =
                                ((tty->termios->c_cflag & ~CLOCAL) |
                                 (arg ? CLOCAL : 0));
                        return 0;
                case TIOCGSERIAL:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                                sizeof(struct serial_struct));
                        if (error)
                                return error;
                        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 */
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                sizeof(unsigned int));
                        if (error)
                                return error;
                        else
                            return get_lsr_info(info, (unsigned int *) arg);
 
                case TIOCSERGSTRUCT:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                                sizeof(struct sun_serial));
                        if (error)
                                return error;
                        memcpy_tofs((struct sun_serial *) arg,
                                    info, sizeof(struct sun_serial));
                        return 0;
 
                default:
                        return -ENOIOCTLCMD;
                }
        return 0;
}
 
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
        struct sun_serial *info = (struct sun_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;
                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
 * ZILOG 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 sun_serial * info = (struct sun_serial *)tty->driver_data;
        unsigned long flags;
 
        if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
                return;
 
        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, info->count);
#endif
        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("rs_close: bad serial port count; tty->count is 1, "
                       "info->count is %d\n", info->count);
                info->count = 1;
        }
        if (--info->count < 0) {
                printk("rs_close: bad serial port count for ttys%d: %d\n",
                       info->line, info->count);
                info->count = 0;
        }
        if (info->count) {
                restore_flags(flags);
                return;
        }
        info->flags |= ZILOG_CLOSING;
        /*
         * Save the termios structure, since this port may have
         * separate termios for callout and dialin.
         */
        if (info->flags & ZILOG_NORMAL_ACTIVE)
                info->normal_termios = *tty->termios;
        if (info->flags & ZILOG_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 != ZILOG_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.
         */
        /** if (!info->iscons) ... **/
        info->curregs[3] &= ~RxENABLE;
        info->pendregs[3] = info->curregs[3];
        write_zsreg(info->zs_channel, 3, info->curregs[3]);
        info->curregs[1] &= ~(0x18);
        info->pendregs[1] = info->curregs[1];
        write_zsreg(info->zs_channel, 1, info->curregs[1]);
        ZS_CLEARFIFO(info->zs_channel);
 
        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;
                        current->timeout = jiffies + info->close_delay;
                        schedule();
                }
                wake_up_interruptible(&info->open_wait);
        }
        info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
                         ZILOG_CLOSING);
        wake_up_interruptible(&info->close_wait);
        restore_flags(flags);
}
 
/*
 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 */
void rs_hangup(struct tty_struct *tty)
{
        struct sun_serial * info = (struct sun_serial *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_hangup"))
                return;
 
        rs_flush_buffer(tty);
        shutdown(info);
        info->event = 0;
        info->count = 0;
        info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_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 sun_serial *info)
{
        struct wait_queue wait = { current, NULL };
        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 & ZILOG_CLOSING) {
                interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
                if (info->flags & ZILOG_HUP_NOTIFY)
                        return -EAGAIN;
                else
                        return -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 & ZILOG_NORMAL_ACTIVE)
                        return -EBUSY;
                if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
                    (info->flags & ZILOG_SESSION_LOCKOUT) &&
                    (info->session != current->session))
                    return -EBUSY;
                if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
                    (info->flags & ZILOG_PGRP_LOCKOUT) &&
                    (info->pgrp != current->pgrp))
                    return -EBUSY;
                info->flags |= ZILOG_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 & ZILOG_CALLOUT_ACTIVE)
                        return -EBUSY;
                info->flags |= ZILOG_NORMAL_ACTIVE;
                return 0;
        }
 
        if (info->flags & ZILOG_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
         * 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",
               info->line, info->count);
#endif
        info->count--;
        info->blocked_open++;
        while (1) {
                cli();
                if (!(info->flags & ZILOG_CALLOUT_ACTIVE))
                        zs_rtsdtr(info, 1);
                sti();
                current->state = TASK_INTERRUPTIBLE;
                if (tty_hung_up_p(filp) ||
                    !(info->flags & ZILOG_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
                        if (info->flags & ZILOG_HUP_NOTIFY)
                                retval = -EAGAIN;
                        else
                                retval = -ERESTARTSYS;
#else
                        retval = -EAGAIN;
#endif
                        break;
                }
                if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
                    !(info->flags & ZILOG_CLOSING) && do_clocal)
                        break;
                if (current->signal & ~current->blocked) {
                        retval = -ERESTARTSYS;
                        break;
                }
#ifdef SERIAL_DEBUG_OPEN
                printk("block_til_ready blocking: ttys%d, count = %d\n",
                       info->line, info->count);
#endif
                schedule();
        }
        current->state = TASK_RUNNING;
        remove_wait_queue(&info->open_wait, &wait);
        if (!tty_hung_up_p(filp))
                info->count++;
        info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready after blocking: ttys%d, count = %d\n",
               info->line, info->count);
#endif
        if (retval)
                return retval;
        info->flags |= ZILOG_NORMAL_ACTIVE;
        return 0;
}
 
/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port, linking in its ZILOG structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 */
int rs_open(struct tty_struct *tty, struct file * filp)
{
        struct sun_serial       *info;
        int                     retval, line;
 
        line = MINOR(tty->device) - tty->driver.minor_start;
        /* The zilog lines for the mouse/keyboard must be
         * opened using their respective drivers.
         */
        if ((line < 0) || (line >= NUM_CHANNELS))
                return -ENODEV;
        if((line == KEYBOARD_LINE) || (line == MOUSE_LINE))
                return -ENODEV;
        info = zs_soft + line;
        /* Is the kgdb running over this line? */
        if (info->kgdb_channel)
                return -ENODEV;
        if (serial_paranoia_check(info, tty->device, "rs_open"))
                return -ENODEV;
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
               info->count);
#endif
        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) {
#ifdef SERIAL_DEBUG_OPEN
                printk("rs_open returning after block_til_ready with %d\n",
                       retval);
#endif
                return retval;
        }
 
        if ((info->count == 1) && (info->flags & ZILOG_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;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open ttys%d successful...", info->line);
#endif
        return 0;
}
 
/* Finally, routines used to initialize the serial driver. */
 
static void show_serial_version(void)
{
        printk("Sparc Zilog8530 serial driver version 1.00\n");
}
 
/* Probe the PROM for the request zs chip number. */
static inline struct sun_zslayout *get_zs(int chip)
{
        struct linux_prom_irqs tmp_irq;
        unsigned long paddr = 0;
        unsigned long vaddr = 0;
        int zsnode, tmpnode, iospace, slave;
        static int irq = 0;
 
#if CONFIG_AP1000
        printk("No zs chip\n");
        return NULL;
#endif
 
        iospace = 0;
        if(chip < 0 || chip >= NUM_SERIAL)
                panic("get_zs bogon zs chip number");
 
        if(sparc_cpu_model == sun4) {
                /* Grrr, these have to be hardcoded aieee */
                switch(chip) {
                case 0:
                        paddr = 0xf1000000;
                        break;
                case 1:
                        paddr = 0xf0000000;
                        break;
                };
                iospace = 0;
                zs_nodes[chip] = 0;
                if(!irq)
                        zilog_irq = irq = 12;
                vaddr = (unsigned long)
                        sparc_alloc_io((char *) paddr, 0, 8,
                                       "Zilog Serial", iospace, 0);
        } else {
                /* Can use the prom for other machine types */
                zsnode = prom_getchild(prom_root_node);
                tmpnode = prom_searchsiblings(zsnode, "obio");
                if(tmpnode)
                        zsnode = prom_getchild(tmpnode);
                if(!zsnode)
                        panic("get_zs no zs serial prom node");
                while(zsnode) {
                        zsnode = prom_searchsiblings(zsnode, "zs");
                        slave = prom_getintdefault(zsnode, "slave", -1);
                        if(slave==chip) {
                                /* The one we want */
                                vaddr = (unsigned long)
                                        prom_getintdefault(zsnode, "address",
                                                               0xdeadbeef);
                                if(vaddr == 0xdeadbeef)
                                        prom_halt();
                                zs_nodes[chip] = zsnode;
                                prom_getproperty(zsnode, "intr",
                                                 (char *) &tmp_irq,
                                                 sizeof(tmp_irq));
#ifdef OLD_STYLE_IRQ
                                tmp_irq.pri &= 0xf;
#endif
                                if(!irq) {
                                        irq = zilog_irq = tmp_irq.pri;
                                } else {
                                        if(tmp_irq.pri != irq)
                                                panic("zilog: bogon irqs");
                                }
                                break;
                        }
                        zsnode = prom_getsibling(zsnode);
                }
                if(!zsnode)
                        panic("get_zs whee chip not found");
        }
        if(!vaddr)
                panic("get_zs whee no serial chip mappable");
 
        return (struct sun_zslayout *) vaddr;
 
}
 
 
extern void register_console(void (*proc)(const char *));
 
static inline void
rs_cons_check(struct sun_serial *ss, int channel)
{
        int i, o, io;
        static consout_registered = 0;
        static msg_printed = 0;
 
        i = o = io = 0;
 
        /* Is this one of the serial console lines? */
        if((zs_cons_chanout != channel) &&
           (zs_cons_chanin != channel))
                return;
        zs_conschan = ss->zs_channel;
        zs_consinfo = ss;
 
        /* Register the console output putchar, if necessary */
        if((zs_cons_chanout == channel)) {
                o = 1;
                /* double whee.. */
                if(!consout_registered) {
                        register_console(zs_console_print);
                        consout_registered = 1;
                }
        }
 
        /* If this is console input, we handle the break received
         * status interrupt on this line to mean prom_halt().
         */
        if(zs_cons_chanin == channel) {
                ss->break_abort = 1;
                i = 1;
        }
        if(o && i)
                io = 1;
        if(ss->zs_baud != 9600)
                panic("Console baud rate weirdness");
 
        /* Set flag variable for this port so that it cannot be
         * opened for other uses by accident.
         */
        ss->is_cons = 1;
 
        if(io) {
                if(!msg_printed) {
                        printk("zs%d: console I/O\n", ((channel>>1)&1));
                        msg_printed = 1;
                }
        } else {
                printk("zs%d: console %s\n", ((channel>>1)&1),
                       (i==1 ? "input" : (o==1 ? "output" : "WEIRD")));
        }
}
 
volatile int test_done;
extern void keyboard_zsinit(void);
extern void sun_mouse_zsinit(void);
 
/* rs_init inits the driver */
int rs_init(void)
{
        int chip, channel, i, flags;
        struct sun_serial *info;
 
#if CONFIG_AP1000
        printk("not doing rs_init()\n");
        return 0;
#endif
 
        /* Setup base handler, and timer table. */
        init_bh(SERIAL_BH, do_serial_bh);
        timer_table[RS_TIMER].fn = rs_timer;
        timer_table[RS_TIMER].expires = 0;
 
        show_serial_version();
 
        /* Initialize the tty_driver structure */
        /* SPARC: Not all of this is exactly right for us. */
 
        memset(&serial_driver, 0, sizeof(struct tty_driver));
        serial_driver.magic = TTY_DRIVER_MAGIC;
        serial_driver.name = "ttyS";
        serial_driver.major = TTY_MAJOR;
        serial_driver.minor_start = 64;
        serial_driver.num = NUM_CHANNELS;
        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;
        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.flush_chars = rs_flush_chars;
        serial_driver.write_room = rs_write_room;
        serial_driver.chars_in_buffer = rs_chars_in_buffer;
        serial_driver.flush_buffer = rs_flush_buffer;
        serial_driver.ioctl = rs_ioctl;
        serial_driver.throttle = rs_throttle;
        serial_driver.unthrottle = rs_unthrottle;
        serial_driver.set_termios = rs_set_termios;
        serial_driver.stop = rs_stop;
        serial_driver.start = rs_start;
        serial_driver.hangup = rs_hangup;
 
        /*
         * The callout device is just like normal device except for
         * major number and the subtype code.
         */
        callout_driver = serial_driver;
        callout_driver.name = "cua";
        callout_driver.major = TTYAUX_MAJOR;
        callout_driver.subtype = SERIAL_TYPE_CALLOUT;
 
        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");
 
        save_flags(flags); cli();
 
        /* Set up our interrupt linked list */
        zs_chain = &zs_soft[0];
        zs_soft[0].zs_next = &zs_soft[1];
        zs_soft[1].zs_next = &zs_soft[2];
        zs_soft[2].zs_next = &zs_soft[3];
        zs_soft[3].zs_next = 0;
 
        for(chip = 0; chip < NUM_SERIAL; chip++) {
                /* If we are doing kgdb over one of the channels on
                 * chip zero, kgdb_channel will be set to 1 by the
                 * rs_kgdb_hook() routine below.
                 */
                if(!zs_chips[chip]) {
                        zs_chips[chip] = get_zs(chip);
                        /* Two channels per chip */
                        zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
                        zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
                        zs_soft[(chip*2)].kgdb_channel = 0;
                        zs_soft[(chip*2)+1].kgdb_channel = 0;
                }
                /* First, set up channel A on this chip. */
                channel = chip * 2;
                zs_soft[channel].zs_channel = zs_channels[channel];
                zs_soft[channel].change_needed = 0;
                zs_soft[channel].clk_divisor = 16;
                zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
                zs_soft[channel].cons_mouse = 0;
                /* If not keyboard/mouse and is console serial
                 * line, then enable receiver interrupts.
                 */
                if((channel<KEYBOARD_LINE) && (zs_soft[channel].is_cons)) {
                        write_zsreg(zs_soft[channel].zs_channel, R1,
                                    (EXT_INT_ENAB | INT_ALL_Rx));
                        write_zsreg(zs_soft[channel].zs_channel, R9, (NV | MIE));
                        write_zsreg(zs_soft[channel].zs_channel, R10, (NRZ));
                        write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8|RxENABLE));
                        write_zsreg(zs_soft[channel].zs_channel, R5, (Tx8 | TxENAB));
                }
                /* If this is the kgdb line, enable interrupts because we
                 * now want to receive the 'control-c' character from the
                 * client attached to us asynchronously.
                 */
                if(zs_soft[channel].kgdb_channel)
                        kgdb_chaninit(&zs_soft[channel], 1, zs_soft[channel].zs_baud);
 
                if(channel == KEYBOARD_LINE) {
                        /* Tell keyboard driver about our presence. */
                        if(zs_soft[channel].zs_baud != 1200)
                                panic("Weird keyboard serial baud rate");
                        zs_soft[channel].cons_keyb = 1;
                        zs_kbdchan = zs_soft[channel].zs_channel;
                        /* Enable Rx/Tx, IRQs, and inform kbd driver */
                        write_zsreg(zs_soft[channel].zs_channel, R1,
                                    (EXT_INT_ENAB | INT_ALL_Rx));
                        write_zsreg(zs_soft[channel].zs_channel, R4,
                                    (PAR_EVEN | X16CLK | SB1));
                        write_zsreg(zs_soft[channel].zs_channel, R9, (NV|MIE));
                        write_zsreg(zs_soft[channel].zs_channel, R10, (NRZ));
                        write_zsreg(zs_soft[channel].zs_channel, R11,
                                    (TCBR | RCBR));
                        write_zsreg(zs_soft[channel].zs_channel, R14,
                                    (BRSRC | BRENABL));
                        write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8|RxENABLE));
                        write_zsreg(zs_soft[channel].zs_channel, R5,
                                    (Tx8 | TxENAB | DTR | RTS));
#if 0
                        write_zsreg(zs_soft[channel].zs_channel, R15,
                                    (DCDIE | CTSIE | TxUIE | BRKIE));
#endif
                        ZS_CLEARERR(zs_soft[channel].zs_channel);
                        ZS_CLEARFIFO(zs_soft[channel].zs_channel);
                }
 
                /* Now, channel B */
                channel++;
                zs_soft[channel].zs_channel = zs_channels[channel];
                zs_soft[channel].change_needed = 0;
                zs_soft[channel].clk_divisor = 16;
                zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
                zs_soft[channel].cons_keyb = 0;
                /* If not keyboard/mouse and is console serial
                 * line, then enable receiver interrupts.
                 */
                if(channel<KEYBOARD_LINE && zs_soft[channel].is_cons) {
                        write_zsreg(zs_soft[channel].zs_channel, R1,
                                    (EXT_INT_ENAB | INT_ALL_Rx));
                        write_zsreg(zs_soft[channel].zs_channel, R9,
                                    (NV | MIE));
                        write_zsreg(zs_soft[channel].zs_channel, R10,
                                    (NRZ));
                        write_zsreg(zs_soft[channel].zs_channel, R3,
                                    (Rx8|RxENABLE));
                        write_zsreg(zs_soft[channel].zs_channel, R5,
                                    (Tx8 | TxENAB | RTS | DTR));
                }
                if(channel == MOUSE_LINE) {
                        /* Tell mouse driver about our presence. */
                        if(zs_soft[channel].zs_baud != 1200)
                                panic("Weird mouse serial baud rate");
                        zs_soft[channel].cons_mouse = 1;
                        zs_mousechan = zs_soft[channel].zs_channel;
                        /* Enable Rx, IRQs, and inform mouse driver */
                        write_zsreg(zs_soft[channel].zs_channel, R1, (INT_ALL_Rx));
                        write_zsreg(zs_soft[channel].zs_channel, R9, (NV|MIE));
                        write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8|RxENABLE));
#if 0 /* XXX hangs sun4c's sometimes */
                        write_zsreg(zs_soft[channel].zs_channel, R15,
                                    (DCDIE | CTSIE | TxUIE | BRKIE));
#endif
                        sun_mouse_zsinit();
                } else {
                        zs_soft[channel].cons_mouse = 0;
                }
        }
 
        for(info=zs_chain, i=0; info; info = info->zs_next, i++)
        {
                info->magic = SERIAL_MAGIC;
                info->port = (int) info->zs_channel;
                info->line = i;
                info->tty = 0;
                info->irq = zilog_irq;
                info->custom_divisor = 16;
                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;
                info->open_wait = 0;
                info->close_wait = 0;
                printk("tty%02d at 0x%04x (irq = %d)", info->line,
                       info->port, info->irq);
                printk(" is a Zilog8530\n");
        }
 
        if (request_irq(zilog_irq,
                        rs_interrupt,
                        (SA_INTERRUPT | SA_STATIC_ALLOC),
                        "Zilog8530", NULL))
                panic("Unable to attach zs intr\n");
        restore_flags(flags);
 
        keyboard_zsinit();
 
        return 0;
}
 
/*
 * register_serial and unregister_serial allows for serial ports to be
 * configured at run-time, to support PCMCIA modems.
 */
/* SPARC: Unused at this time, just here to make things link. */
int register_serial(struct serial_struct *req)
{
        return -1;
}
 
void unregister_serial(int line)
{
        return;
}
 
/* Hooks for running a serial console.  con_init() calls this if the
 * console is being run over one of the ttya/ttyb serial ports.
 * 'chip' should be zero, as chip 1 drives the mouse/keyboard.
 * 'channel' is decoded as 0=TTYA 1=TTYB, note that the channels
 * are addressed backwards, channel B is first, then channel A.
 */
void
rs_cons_hook(int chip, int out, int channel)
{
        if(chip)
                panic("rs_cons_hook called with chip not zero");
        if(!zs_chips[chip]) {
                zs_chips[chip] = get_zs(chip);
                /* Two channels per chip */
                zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
                zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
        }
        zs_soft[channel].zs_channel = zs_channels[channel];
        zs_soft[channel].change_needed = 0;
        zs_soft[channel].clk_divisor = 16;
        zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
        rs_cons_check(&zs_soft[channel], channel);
        if(out)
                zs_cons_chanout = ((chip * 2) + channel);
        else
                zs_cons_chanin = ((chip * 2) + channel);
 
}
 
/* This is called at boot time to prime the kgdb serial debugging
 * serial line.  The 'tty_num' argument is 0 for /dev/ttya and 1
 * for /dev/ttyb which is determined in setup_arch() from the
 * boot command line flags.
 */
void
rs_kgdb_hook(int tty_num)
{
        int chip = 0;
 
        if(!zs_chips[chip]) {
                zs_chips[chip] = get_zs(chip);
                /* Two channels per chip */
                zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
                zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
        }
        zs_soft[tty_num].zs_channel = zs_channels[tty_num];
        zs_kgdbchan = zs_soft[tty_num].zs_channel;
        zs_soft[tty_num].change_needed = 0;
        zs_soft[tty_num].clk_divisor = 16;
        zs_soft[tty_num].zs_baud = get_zsbaud(&zs_soft[tty_num]);
        zs_soft[tty_num].kgdb_channel = 1;     /* This runs kgdb */
        zs_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */
        /* Turn on transmitter/receiver at 8-bits/char */
        kgdb_chaninit(&zs_soft[tty_num], 0, 9600);
        ZS_CLEARERR(zs_kgdbchan);
        udelay(5);
        ZS_CLEARFIFO(zs_kgdbchan);
}
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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sbus/] [char/] [sunserial.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1626	jcastillo	`/* serial.c: Serial port driver for the Sparc.`
2			`*`
3			`* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)`
4			`*/`
5
6			`#include <linux/errno.h>`
7			`#include <linux/signal.h>`
8			`#include <linux/sched.h>`
9			`#include <linux/timer.h>`
10			`#include <linux/interrupt.h>`
11			`#include <linux/tty.h>`
12			`#include <linux/tty_flip.h>`
13			`#include <linux/config.h>`
14			`#include <linux/major.h>`
15			`#include <linux/string.h>`
16			`#include <linux/fcntl.h>`
17			`#include <linux/mm.h>`
18			`#include <linux/kernel.h>`
19
20			`#include <asm/io.h>`
21			`#include <asm/irq.h>`
22			`#include <asm/oplib.h>`
23			`#include <asm/system.h>`
24			`#include <asm/segment.h>`
25			`#include <asm/bitops.h>`
26			`#include <asm/delay.h>`
27			`#include <asm/kdebug.h>`
28
29			`#include "sunserial.h"`
30
31			`#define NUM_SERIAL 2 /* Two chips on board. */`
32			`#define NUM_CHANNELS (NUM_SERIAL * 2)`
33
34			`#define KEYBOARD_LINE 0x2`
35			`#define MOUSE_LINE 0x3`
36
37			`struct sun_zslayout *zs_chips[NUM_SERIAL] = { 0, 0, };`
38			`struct sun_zschannel *zs_channels[NUM_CHANNELS] = { 0, 0, 0, 0, };`
39			`struct sun_zschannel *zs_conschan;`
40			`struct sun_zschannel *zs_mousechan;`