initial commit with v2.6.9

[linux-2.6.9-moxart.git] / arch / ppc / 8xx_io / uart.c

/*
 *  UART driver for MPC860 CPM SCC or SMC
 *  Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
 *
 * I used the serial.c driver as the framework for this driver.
 * Give credit to those guys.
 * The original code was written for the MBX860 board.  I tried to make
 * it generic, but there may be some assumptions in the structures that
 * have to be fixed later.
 * To save porting time, I did not bother to change any object names
 * that are not accessed outside of this file.
 * It still needs lots of work........When it was easy, I included code
 * to support the SCCs, but this has never been tested, nor is it complete.
 * Only the SCCs support modem control, so that is not complete either.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/8xx_immap.h>
#include <asm/mpc8xx.h>
#include <asm/commproc.h>
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#endif

#ifdef CONFIG_KGDB
#include <asm/kgdb.h>
#endif

#ifdef CONFIG_SERIAL_CONSOLE
#include <linux/console.h>

/* this defines the index into rs_table for the port to use
*/
# ifndef CONFIG_SERIAL_CONSOLE_PORT
#  ifdef CONFIG_SCC3_ENET
#   ifdef CONFIG_CONS_SMC2
#    define CONFIG_SERIAL_CONSOLE_PORT  0       /* Console on SMC2 is 1st port */
#   else
#    error "Can't use SMC1 for console with Ethernet on SCC3"
#   endif
#  else /* ! CONFIG_SCC3_ENET */
#   ifdef CONFIG_CONS_SMC2                      /* Console on SMC2 */
#    define CONFIG_SERIAL_CONSOLE_PORT  1
#   else                                        /* Console on SMC1 */
#    define CONFIG_SERIAL_CONSOLE_PORT  0
#   endif /* CONFIG_CONS_SMC2 */
#  endif  /* CONFIG_SCC3_ENET */
# endif   /* CONFIG_SERIAL_CONSOLE_PORT */
#endif    /* CONFIG_SERIAL_CONSOLE */

#if 0
/* SCC2 for console
*/
#undef CONFIG_SERIAL_CONSOLE_PORT
#define CONFIG_SERIAL_CONSOLE_PORT      2
#endif

#define TX_WAKEUP       ASYNC_SHARE_IRQ

static char *serial_name = "CPM UART driver";
static char *serial_version = "0.03";

static DECLARE_TASK_QUEUE(tq_serial);

static struct tty_driver *serial_driver;
static int serial_console_setup(struct console *co, char *options);

static void serial_console_write(struct console *c, const char *s,
                                unsigned count);
static struct tty_driver *serial_console_device(struct console *c, int *index)

#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static unsigned long break_pressed; /* break, really ... */
#endif

/*
 * Serial driver configuration section.  Here are the various options:
 */
#define SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART

/* Set of debugging defines */

#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT

#define _INLINE_ inline

#define DBG_CNT(s)

/* We overload some of the items in the data structure to meet our
 * needs.  For example, the port address is the CPM parameter ram
 * offset for the SCC or SMC.  The maximum number of ports is 4 SCCs and
 * 2 SMCs.  The "hub6" field is used to indicate the channel number, with
 * a flag indicating SCC or SMC, and the number is used as an index into
 * the CPM parameter area for this device.
 * The "type" field is currently set to 0, for PORT_UNKNOWN.  It is
 * not currently used.  I should probably use it to indicate the port
 * type of SMC or SCC.
 * The SMCs do not support any modem control signals.
 */
#define smc_scc_num     hub6
#define NUM_IS_SCC      ((int)0x00010000)
#define PORT_NUM(P)     ((P) & 0x0000ffff)

/* The choice of serial port to use for KGDB.  If the system has
 * two ports, you can use one for console and one for KGDB (which
 * doesn't make sense to me, but people asked for it).
 */
#ifdef CONFIG_KGDB_TTYS1
#define KGDB_SER_IDX 1          /* SCC2/SMC2 */
#else
#define KGDB_SER_IDX 0          /* SCC1/SMC1 */
#endif

/* Processors other than the 860 only get SMCs configured by default.
 * Either they don't have SCCs or they are allocated somewhere else.
 * Of course, there are now 860s without some SCCs, so we will need to
 * address that someday.
 * The Embedded Planet Multimedia I/O cards use TDM interfaces to the
 * stereo codec parts, and we use SMC2 to help support that.
 */
static struct serial_state rs_table[] = {
        /* UART CLK   PORT          IRQ      FLAGS  NUM   */
#ifndef CONFIG_SCC3_ENET        /* SMC1 not usable with Ethernet on SCC3 */
        { 0,     0, PROFF_SMC1, CPMVEC_SMC1,   0,    0 },    /* SMC1 ttyS0 */
#endif
#if !defined(CONFIG_USB_MPC8xx) && !defined(CONFIG_USB_CLIENT_MPC8xx)
# ifdef CONFIG_SMC2_UART
        { 0,     0, PROFF_SMC2, CPMVEC_SMC2,   0,    1 },    /* SMC2 ttyS1 */
# endif
# ifdef CONFIG_USE_SCC_IO
        { 0,     0, PROFF_SCC2, CPMVEC_SCC2,   0,    (NUM_IS_SCC | 1) },    /* SCC2 ttyS2 */
        { 0,     0, PROFF_SCC3, CPMVEC_SCC3,   0,    (NUM_IS_SCC | 2) },    /* SCC3 ttyS3 */
# endif
  #else /* CONFIG_USB_xxx */
# ifdef CONFIG_USE_SCC_IO
        { 0,     0, PROFF_SCC3, CPMVEC_SCC3,   0,    (NUM_IS_SCC | 2) },    /* SCC3 ttyS3 */
# endif
#endif  /* CONFIG_USB_xxx */
};

#define NR_PORTS        (sizeof(rs_table)/sizeof(struct serial_state))

/* The number of buffer descriptors and their sizes.
*/
#define RX_NUM_FIFO     4
#define RX_BUF_SIZE     32
#define TX_NUM_FIFO     4
#define TX_BUF_SIZE     32

/* The async_struct in serial.h does not really give us what we
 * need, so define our own here.
 */
typedef struct serial_info {
        int                     magic;
        int                     flags;
        struct serial_state     *state;
        struct tty_struct       *tty;
        int                     read_status_mask;
        int                     ignore_status_mask;
        int                     timeout;
        int                     line;
        int                     x_char; /* xon/xoff character */
        int                     close_delay;
        unsigned short          closing_wait;
        unsigned short          closing_wait2;
        unsigned long           event;
        unsigned long           last_active;
        int                     blocked_open; /* # of blocked opens */
        struct tq_struct        tqueue;
        struct tq_struct        tqueue_hangup;
        wait_queue_head_t       open_wait;
        wait_queue_head_t       close_wait;

        /* CPM Buffer Descriptor pointers.
        */
        cbd_t                   *rx_bd_base;
        cbd_t                   *rx_cur;
        cbd_t                   *tx_bd_base;
        cbd_t                   *tx_cur;

        /* Virtual addresses for the FIFOs because we can't __va() a
         * physical address anymore.
         */
         unsigned char          *rx_va_base;
         unsigned char          *tx_va_base;
} ser_info_t;

static struct console sercons = {
        .name =         "ttyS",
        .write =        serial_console_write,
        .device =       serial_console_device,
        .setup =        serial_console_setup,
        .flags =        CON_PRINTBUFFER,
        .index =        CONFIG_SERIAL_CONSOLE_PORT,
};

static void change_speed(ser_info_t *info);
static void rs_8xx_wait_until_sent(struct tty_struct *tty, int timeout);

static inline int serial_paranoia_check(ser_info_t *info,
                                        char *name, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
        static const char *badmagic =
                "Warning: bad magic number for serial struct (%s) in %s\n";
        static const char *badinfo =
                "Warning: null async_struct for (%s) in %s\n";

        if (!info) {
                printk(badinfo, name, routine);
                return 1;
        }
        if (info->magic != SERIAL_MAGIC) {
                printk(badmagic, name, routine);
                return 1;
        }
#endif
        return 0;
}

/*
 * This is used to figure out the divisor speeds and the timeouts,
 * indexed by the termio value.  The generic CPM functions are responsible
 * for setting and assigning baud rate generators for us.
 */
static int baud_table[] = {
        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
        9600, 19200, 38400, 57600, 115200, 230400, 460800, 0 };


/*
 * ------------------------------------------------------------
 * 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_8xx_stop(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        int     idx;
        unsigned long flags;
        volatile scc_t  *sccp;
        volatile smc_t  *smcp;

        if (serial_paranoia_check(info, tty->name, "rs_stop"))
                return;

        save_flags(flags); cli();
        idx = PORT_NUM(info->state->smc_scc_num);
        if (info->state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                sccp->scc_sccm &= ~UART_SCCM_TX;
        }
        else {
                smcp = &cpmp->cp_smc[idx];
                smcp->smc_smcm &= ~SMCM_TX;
        }
        restore_flags(flags);
}

static void rs_8xx_start(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        int     idx;
        unsigned long flags;
        volatile scc_t  *sccp;
        volatile smc_t  *smcp;

        if (serial_paranoia_check(info, tty->name, "rs_stop"))
                return;

        idx = PORT_NUM(info->state->smc_scc_num);
        save_flags(flags); cli();
        if (info->state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                sccp->scc_sccm |= UART_SCCM_TX;
        }
        else {
                smcp = &cpmp->cp_smc[idx];
                smcp->smc_smcm |= SMCM_TX;
        }
        restore_flags(flags);
}

/*
 * ----------------------------------------------------------------------
 *
 * Here starts the interrupt handling routines.  All of the following
 * subroutines are declared as inline and are folded into
 * rs_interrupt().  They were separated out for readability's sake.
 *
 * Note: rs_interrupt() is a "fast" interrupt, which means that it
 * runs with interrupts turned off.  People who may want to modify
 * rs_interrupt() should try to keep the interrupt handler as fast as
 * possible.  After you are done making modifications, it is not a bad
 * idea to do:
 *
 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 * -----------------------------------------------------------------------
 */

/*
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver.
 */
static _INLINE_ void rs_sched_event(ser_info_t *info,
                                  int event)
{
        info->event |= 1 << event;
        queue_task(&info->tqueue, &tq_serial);
        mark_bh(SERIAL_BH);
}

static _INLINE_ void receive_chars(ser_info_t *info, struct pt_regs *regs)
{
        struct tty_struct *tty = info->tty;
        unsigned char ch, *cp;
        /*int   ignored = 0;*/
        int     i;
        ushort  status;
        struct  async_icount *icount;
        volatile cbd_t  *bdp;

        icount = &info->state->icount;

        /* Just loop through the closed BDs and copy the characters into
         * the buffer.
         */
        bdp = info->rx_cur;
        for (;;) {
                if (bdp->cbd_sc & BD_SC_EMPTY)  /* If this one is empty */
                        break;                  /*   we are all done */

                /* The read status mask tell us what we should do with
                 * incoming characters, especially if errors occur.
                 * One special case is the use of BD_SC_EMPTY.  If
                 * this is not set, we are supposed to be ignoring
                 * inputs.  In this case, just mark the buffer empty and
                 * continue.
                if (!(info->read_status_mask & BD_SC_EMPTY)) {
                        bdp->cbd_sc |= BD_SC_EMPTY;
                        bdp->cbd_sc &=
                                ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);

                        if (bdp->cbd_sc & BD_SC_WRAP)
                                bdp = info->rx_bd_base;
                        else
                                bdp++;
                        continue;
                }
                 */

                /* Get the number of characters and the buffer pointer.
                */
                i = bdp->cbd_datlen;
                cp = info->rx_va_base + ((bdp - info->rx_bd_base) * RX_BUF_SIZE);
                status = bdp->cbd_sc;
#ifdef CONFIG_KGDB
                if (info->state->smc_scc_num == KGDB_SER_IDX) {
                        if (*cp == 0x03 || *cp == '$')
                                breakpoint();
                        return;
                }
#endif

                /* Check to see if there is room in the tty buffer for
                 * the characters in our BD buffer.  If not, we exit
                 * now, leaving the BD with the characters.  We'll pick
                 * them up again on the next receive interrupt (which could
                 * be a timeout).
                 */
                if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE)
                        break;

                while (i-- > 0) {
                        ch = *cp++;
                        *tty->flip.char_buf_ptr = ch;
                        icount->rx++;

#ifdef SERIAL_DEBUG_INTR
                        printk("DR%02x:%02x...", ch, status);
#endif
                        *tty->flip.flag_buf_ptr = 0;
                        if (status & (BD_SC_BR | BD_SC_FR |
                                       BD_SC_PR | BD_SC_OV)) {
                                /*
                                 * For statistics only
                                 */
                                if (status & BD_SC_BR)
                                        icount->brk++;
                                else if (status & BD_SC_PR)
                                        icount->parity++;
                                else if (status & BD_SC_FR)
                                        icount->frame++;
                                if (status & BD_SC_OV)
                                        icount->overrun++;

                                /*
                                 * Now check to see if character should be
                                 * ignored, and mask off conditions which
                                 * should be ignored.
                                if (status & info->ignore_status_mask) {
                                        if (++ignored > 100)
                                                break;
                                        continue;
                                }
                                 */
                                status &= info->read_status_mask;

                                if (status & (BD_SC_BR)) {
#ifdef SERIAL_DEBUG_INTR
                                        printk("handling break....");
#endif
                                        *tty->flip.flag_buf_ptr = TTY_BREAK;
                                        if (info->flags & ASYNC_SAK)
                                                do_SAK(tty);
                                } else if (status & BD_SC_PR)
                                        *tty->flip.flag_buf_ptr = TTY_PARITY;
                                else if (status & BD_SC_FR)
                                        *tty->flip.flag_buf_ptr = TTY_FRAME;
                                if (status & BD_SC_OV) {
                                        /*
                                         * Overrun is special, since it's
                                         * reported immediately, and doesn't
                                         * affect the current character
                                         */
                                        if (tty->flip.count < TTY_FLIPBUF_SIZE) {
                                                tty->flip.count++;
                                                tty->flip.flag_buf_ptr++;
                                                tty->flip.char_buf_ptr++;
                                                *tty->flip.flag_buf_ptr =
                                                                TTY_OVERRUN;
                                        }
                                }
                        }
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
                        if (break_pressed && info->line == sercons.index) {
                                if (ch != 0 && time_before(jiffies,
                                                        break_pressed + HZ*5)) {
                                        handle_sysrq(ch, regs, NULL);
                                        break_pressed = 0;
                                        goto ignore_char;
                                } else
                                        break_pressed = 0;
                        }
#endif
                        if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                                break;

                        tty->flip.flag_buf_ptr++;
                        tty->flip.char_buf_ptr++;
                        tty->flip.count++;
                }

#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
        ignore_char:
#endif
                /* This BD is ready to be used again.  Clear status.
                 * Get next BD.
                 */
                bdp->cbd_sc |= BD_SC_EMPTY;
                bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);

                if (bdp->cbd_sc & BD_SC_WRAP)
                        bdp = info->rx_bd_base;
                else
                        bdp++;
        }
        info->rx_cur = (cbd_t *)bdp;

        queue_task(&tty->flip.tqueue, &tq_timer);
}

static _INLINE_ void receive_break(ser_info_t *info, struct pt_regs *regs)
{
        struct tty_struct *tty = info->tty;

        info->state->icount.brk++;

#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
        if (info->line == sercons.index) {
                if (!break_pressed) {
                        break_pressed = jiffies;
                        return;
                } else
                        break_pressed = 0;
        }
#endif

        /* Check to see if there is room in the tty buffer for
         * the break.  If not, we exit now, losing the break.  FIXME
         */
        if ((tty->flip.count + 1) >= TTY_FLIPBUF_SIZE)
                return;
        *(tty->flip.flag_buf_ptr++) = TTY_BREAK;
        *(tty->flip.char_buf_ptr++) = 0;
        tty->flip.count++;

        queue_task(&tty->flip.tqueue, &tq_timer);
}

static _INLINE_ void transmit_chars(ser_info_t *info, struct pt_regs *regs)
{

        if ((info->flags & TX_WAKEUP) ||
            (info->tty->flags & (1 << TTY_DO_WRITE_WAKEUP))) {
                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
        }

#ifdef SERIAL_DEBUG_INTR
        printk("THRE...");
#endif
}

#ifdef notdef
        /* I need to do this for the SCCs, so it is left as a reminder.
        */
static _INLINE_ void check_modem_status(struct async_struct *info)
{
        int     status;
        struct  async_icount *icount;

        status = serial_in(info, UART_MSR);

        if (status & UART_MSR_ANY_DELTA) {
                icount = &info->state->icount;
                /* update input line counters */
                if (status & UART_MSR_TERI)
                        icount->rng++;
                if (status & UART_MSR_DDSR)
                        icount->dsr++;
                if (status & UART_MSR_DDCD) {
                        icount->dcd++;
#ifdef CONFIG_HARD_PPS
                        if ((info->flags & ASYNC_HARDPPS_CD) &&
                            (status & UART_MSR_DCD))
                                hardpps();
#endif
                }
                if (status & UART_MSR_DCTS)
                        icount->cts++;
                wake_up_interruptible(&info->delta_msr_wait);
        }

        if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
                printk("ttys%d CD now %s...", info->line,
                       (status & UART_MSR_DCD) ? "on" : "off");
#endif
                if (status & UART_MSR_DCD)
                        wake_up_interruptible(&info->open_wait);
                else {
#ifdef SERIAL_DEBUG_OPEN
                        printk("scheduling hangup...");
#endif
                        schedule_task(&info->tqueue_hangup);
                }
        }
        if (info->flags & ASYNC_CTS_FLOW) {
                if (info->tty->hw_stopped) {
                        if (status & UART_MSR_CTS) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
                                printk("CTS tx start...");
#endif
                                info->tty->hw_stopped = 0;
                                info->IER |= UART_IER_THRI;
                                serial_out(info, UART_IER, info->IER);
                                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
                                return;
                        }
                } else {
                        if (!(status & UART_MSR_CTS)) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
                                printk("CTS tx stop...");
#endif
                                info->tty->hw_stopped = 1;
                                info->IER &= ~UART_IER_THRI;
                                serial_out(info, UART_IER, info->IER);
                        }
                }
        }
}
#endif

/*
 * This is the serial driver's interrupt routine for a single port
 */
static void rs_8xx_interrupt(void *dev_id, struct pt_regs *regs)
{
        u_char  events;
        int     idx;
        ser_info_t *info;
        volatile smc_t  *smcp;
        volatile scc_t  *sccp;

        info = (ser_info_t *)dev_id;

        idx = PORT_NUM(info->state->smc_scc_num);
        if (info->state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                events = sccp->scc_scce;
                if (events & SMCM_BRKE)
                        receive_break(info, regs);
                if (events & SCCM_RX)
                        receive_chars(info, regs);
                if (events & SCCM_TX)
                        transmit_chars(info, regs);
                sccp->scc_scce = events;
        }
        else {
                smcp = &cpmp->cp_smc[idx];
                events = smcp->smc_smce;
                if (events & SMCM_BRKE)
                        receive_break(info, regs);
                if (events & SMCM_RX)
                        receive_chars(info, regs);
                if (events & SMCM_TX)
                        transmit_chars(info, regs);
                smcp->smc_smce = events;
        }

#ifdef SERIAL_DEBUG_INTR
        printk("rs_interrupt_single(%d, %x)...",
                                        info->state->smc_scc_num, events);
#endif
#ifdef modem_control
        check_modem_status(info);
#endif
        info->last_active = jiffies;
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}


/*
 * -------------------------------------------------------------------
 * Here ends the serial interrupt routines.
 * -------------------------------------------------------------------
 */

/*
 * This routine is used to handle the "bottom half" processing for the
 * serial driver, known also the "software interrupt" processing.
 * This processing is done at the kernel interrupt level, after the
 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 * is where time-consuming activities which can not be done in the
 * interrupt driver proper are done; the interrupt driver schedules
 * them using rs_sched_event(), and they get done here.
 */
static void do_serial_bh(void)
{
        run_task_queue(&tq_serial);
}

static void do_softint(void *private_)
{
        ser_info_t      *info = (ser_info_t *) private_;
        struct tty_struct       *tty;

        tty = info->tty;
        if (!tty)
                return;

        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
                if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
                    tty->ldisc.write_wakeup)
                        (tty->ldisc.write_wakeup)(tty);
                wake_up_interruptible(&tty->write_wait);
        }
}

/*
 * 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 async_struct     *info = (struct async_struct *) private_;
        struct tty_struct       *tty;

        tty = info->tty;
        if (tty)
                tty_hangup(tty);
}

/*static void rs_8xx_timer(void)
{
        printk("rs_8xx_timer\n");
}*/


static int startup(ser_info_t *info)
{
        unsigned long flags;
        int     retval=0;
        int     idx;
        struct serial_state *state= info->state;
        volatile smc_t          *smcp;
        volatile scc_t          *sccp;
        volatile smc_uart_t     *up;
        volatile scc_uart_t     *scup;


        save_flags(flags); cli();

        if (info->flags & ASYNC_INITIALIZED) {
                goto errout;
        }

#ifdef maybe
        if (!state->port || !state->type) {
                if (info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                goto errout;
        }
#endif

#ifdef SERIAL_DEBUG_OPEN
        printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif


#ifdef modem_control
        info->MCR = 0;
        if (info->tty->termios->c_cflag & CBAUD)
                info->MCR = UART_MCR_DTR | UART_MCR_RTS;
#endif

        if (info->tty)
                clear_bit(TTY_IO_ERROR, &info->tty->flags);

        /*
         * and set the speed of the serial port
         */
        change_speed(info);

        idx = PORT_NUM(info->state->smc_scc_num);
        if (info->state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                scup = (scc_uart_t *)&cpmp->cp_dparam[state->port];
                scup->scc_genscc.scc_mrblr = RX_BUF_SIZE;
                scup->scc_maxidl = RX_BUF_SIZE;
                sccp->scc_sccm |= (UART_SCCM_TX | UART_SCCM_RX);
                sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
        }
        else {
                smcp = &cpmp->cp_smc[idx];

                /* Enable interrupts and I/O.
                */
                smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
                smcp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);

                /* We can tune the buffer length and idle characters
                 * to take advantage of the entire incoming buffer size.
                 * If mrblr is something other than 1, maxidl has to be
                 * non-zero or we never get an interrupt.  The maxidl
                 * is the number of character times we wait after reception
                 * of the last character before we decide no more characters
                 * are coming.
                 */
                up = (smc_uart_t *)&cpmp->cp_dparam[state->port];
                up->smc_mrblr = RX_BUF_SIZE;
                up->smc_maxidl = RX_BUF_SIZE;
                up->smc_brkcr = 1;      /* number of break chars */
        }

        info->flags |= ASYNC_INITIALIZED;
        restore_flags(flags);
        return 0;

errout:
        restore_flags(flags);
        return retval;
}

/*
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void shutdown(ser_info_t * info)
{
        unsigned long   flags;
        struct serial_state *state;
        int             idx;
        volatile smc_t  *smcp;
        volatile scc_t  *sccp;

        if (!(info->flags & ASYNC_INITIALIZED))
                return;

        state = info->state;

#ifdef SERIAL_DEBUG_OPEN
        printk("Shutting down serial port %d (irq %d)....", info->line,
               state->irq);
#endif

        save_flags(flags); cli(); /* Disable interrupts */

        idx = PORT_NUM(state->smc_scc_num);
        if (state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#ifdef CONFIG_SERIAL_CONSOLE
                /* We can't disable the transmitter if this is the
                 * system console.
                 */
                if ((state - rs_table) != CONFIG_SERIAL_CONSOLE_PORT)
#endif
                        sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
        }
        else {
                smcp = &cpmp->cp_smc[idx];

                /* Disable interrupts and I/O.
                */
                smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
#ifdef CONFIG_SERIAL_CONSOLE
                /* We can't disable the transmitter if this is the
                 * system console.
                 */
                if ((state - rs_table) != CONFIG_SERIAL_CONSOLE_PORT)
#endif
                        smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
        }

        if (info->tty)
                set_bit(TTY_IO_ERROR, &info->tty->flags);

        info->flags &= ~ASYNC_INITIALIZED;
        restore_flags(flags);
}

/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static void change_speed(ser_info_t *info)
{
        int     baud_rate;
        unsigned cflag, cval, scval, prev_mode, new_mode;
        int     i, bits, sbits, idx;
        unsigned long   flags;
        struct serial_state *state;
        volatile smc_t  *smcp;
        volatile scc_t  *sccp;

        if (!info->tty || !info->tty->termios)
                return;
        cflag = info->tty->termios->c_cflag;

        state = info->state;

        /* Character length programmed into the mode register is the
         * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
         * 1 or 2 stop bits, minus 1.
         * The value 'bits' counts this for us.
         */
        cval = 0;
        scval = 0;

        /* byte size and parity */
        switch (cflag & CSIZE) {
              case CS5: bits = 5; break;
              case CS6: bits = 6; break;
              case CS7: bits = 7; break;
              case CS8: bits = 8; break;
              /* Never happens, but GCC is too dumb to figure it out */
              default:  bits = 8; break;
        }
        sbits = bits - 5;

        if (cflag & CSTOPB) {
                cval |= SMCMR_SL;       /* Two stops */
                scval |= SCU_PMSR_SL;
                bits++;
        }
        if (cflag & PARENB) {
                cval |= SMCMR_PEN;
                scval |= SCU_PMSR_PEN;
                bits++;
                if (!(cflag & PARODD)) {
                        cval |= SMCMR_PM_EVEN;
                        scval |= (SCU_PMSR_REVP | SCU_PMSR_TEVP);
                }
        }

        /* Determine divisor based on baud rate */
        i = cflag & CBAUD;
        if (i >= (sizeof(baud_table)/sizeof(int)))
                baud_rate = 9600;
        else
                baud_rate = baud_table[i];

        info->timeout = (TX_BUF_SIZE*HZ*bits);
        info->timeout += HZ/50;         /* Add .02 seconds of slop */

#ifdef modem_control
        /* CTS flow control flag and modem status interrupts */
        info->IER &= ~UART_IER_MSI;
        if (info->flags & ASYNC_HARDPPS_CD)
                info->IER |= UART_IER_MSI;
        if (cflag & CRTSCTS) {
                info->flags |= ASYNC_CTS_FLOW;
                info->IER |= UART_IER_MSI;
        } else
                info->flags &= ~ASYNC_CTS_FLOW;
        if (cflag & CLOCAL)
                info->flags &= ~ASYNC_CHECK_CD;
        else {
                info->flags |= ASYNC_CHECK_CD;
                info->IER |= UART_IER_MSI;
        }
        serial_out(info, UART_IER, info->IER);
#endif

        /*
         * Set up parity check flag
         */
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))

        info->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
        if (I_INPCK(info->tty))
                info->read_status_mask |= BD_SC_FR | BD_SC_PR;
        if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
                info->read_status_mask |= BD_SC_BR;

        /*
         * Characters to ignore
         */
        info->ignore_status_mask = 0;
        if (I_IGNPAR(info->tty))
                info->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
        if (I_IGNBRK(info->tty)) {
                info->ignore_status_mask |= BD_SC_BR;
                /*
                 * If we're ignore parity and break indicators, ignore
                 * overruns too.  (For real raw support).
                 */
                if (I_IGNPAR(info->tty))
                        info->ignore_status_mask |= BD_SC_OV;
        }
        /*
         * !!! ignore all characters if CREAD is not set
         */
        if ((cflag & CREAD) == 0)
                info->read_status_mask &= ~BD_SC_EMPTY;
        save_flags(flags); cli();

        /* Start bit has not been added (so don't, because we would just
         * subtract it later), and we need to add one for the number of
         * stops bits (there is always at least one).
         */
        bits++;
        idx = PORT_NUM(state->smc_scc_num);
        if (state->smc_scc_num & NUM_IS_SCC) {
                sccp = &cpmp->cp_scc[idx];
                new_mode = (sbits << 12) | scval;
                prev_mode = sccp->scc_pmsr;
                if (!(prev_mode & SCU_PMSR_PEN))
                        /* If parity is disabled, mask out even/odd */
                        prev_mode &= ~(SCU_PMSR_TPM|SCU_PMSR_RPM);
                if (prev_mode != new_mode)
                        sccp->scc_pmsr = new_mode;
        }
        else {
                smcp = &cpmp->cp_smc[idx];

                /* Set the mode register.  We want to keep a copy of the
                 * enables, because we want to put them back if they were
                 * present.
                 */
                prev_mode = smcp->smc_smcmr;
                new_mode = smcr_mk_clen(bits) | cval |  SMCMR_SM_UART;
                new_mode |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
                if (!(prev_mode & SMCMR_PEN))
                        /* If parity is disabled, mask out even/odd */
                        prev_mode &= ~SMCMR_PM_EVEN;
                if (prev_mode != new_mode)
                        smcp->smc_smcmr = new_mode;
        }

        m8xx_cpm_setbrg((state - rs_table), baud_rate);

        restore_flags(flags);
}

static void rs_8xx_put_char(struct tty_struct *tty, unsigned char ch)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        volatile cbd_t  *bdp;
        unsigned char *cp;

        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
                return;

        if (!tty)
                return;

        bdp = info->tx_cur;
        while (bdp->cbd_sc & BD_SC_READY);

        cp = info->tx_va_base + ((bdp - info->tx_bd_base) * TX_BUF_SIZE);
        *cp = ch;
        bdp->cbd_datlen = 1;
        bdp->cbd_sc |= BD_SC_READY;

        /* Get next BD.
        */
        if (bdp->cbd_sc & BD_SC_WRAP)
                bdp = info->tx_bd_base;
        else
                bdp++;

        info->tx_cur = (cbd_t *)bdp;

}

static int rs_8xx_write(struct tty_struct * tty, int from_user,
                    const unsigned char *buf, int count)
{
        int     c, ret = 0;
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        volatile cbd_t *bdp;
        unsigned char   *cp;

#ifdef CONFIG_KGDB_CONSOLE
        /* Try to let stub handle output. Returns true if it did. */
        if (kgdb_output_string(buf, count))
            return ret;
#endif

        if (serial_paranoia_check(info, tty->name, "rs_write"))
                return 0;

        if (!tty)
                return 0;

        bdp = info->tx_cur;

        while (1) {
                c = min(count, TX_BUF_SIZE);

                if (c <= 0)
                        break;

                if (bdp->cbd_sc & BD_SC_READY) {
                        info->flags |= TX_WAKEUP;
                        break;
                }

                cp = info->tx_va_base + ((bdp - info->tx_bd_base) * TX_BUF_SIZE);
                if (from_user) {
                        if (copy_from_user((void *)cp, buf, c)) {
                                if (!ret)
                                        ret = -EFAULT;
                                break;
                        }
                } else {
                        memcpy((void *)cp, buf, c);
                }

                bdp->cbd_datlen = c;
                bdp->cbd_sc |= BD_SC_READY;

                buf += c;
                count -= c;
                ret += c;

                /* Get next BD.
                */
                if (bdp->cbd_sc & BD_SC_WRAP)
                        bdp = info->tx_bd_base;
                else
                        bdp++;
                info->tx_cur = (cbd_t *)bdp;
        }
        return ret;
}

static int rs_8xx_write_room(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        int     ret;

        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
                return 0;

        if ((info->tx_cur->cbd_sc & BD_SC_READY) == 0) {
                info->flags &= ~TX_WAKEUP;
                ret = TX_BUF_SIZE;
        }
        else {
                info->flags |= TX_WAKEUP;
                ret = 0;
        }
        return ret;
}

/* I could track this with transmit counters....maybe later.
*/
static int rs_8xx_chars_in_buffer(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
                
        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
                return 0;
        return 0;
}

static void rs_8xx_flush_buffer(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
                
        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
                return;

        /* There is nothing to "flush", whatever we gave the CPM
         * is on its way out.
         */
        wake_up_interruptible(&tty->write_wait);
        if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
            tty->ldisc.write_wakeup)
                (tty->ldisc.write_wakeup)(tty);
        info->flags &= ~TX_WAKEUP;
}

/*
 * This function is used to send a high-priority XON/XOFF character to
 * the device
 */
static void rs_8xx_send_xchar(struct tty_struct *tty, char ch)
{
        volatile cbd_t  *bdp;
        unsigned char   *cp;

        ser_info_t *info = (ser_info_t *)tty->driver_data;

        if (serial_paranoia_check(info, tty->name, "rs_send_char"))
                return;

        bdp = info->tx_cur;
        while (bdp->cbd_sc & BD_SC_READY);

        cp = info->tx_va_base + ((bdp - info->tx_bd_base) * TX_BUF_SIZE);
        *cp = ch;
        bdp->cbd_datlen = 1;
        bdp->cbd_sc |= BD_SC_READY;

        /* Get next BD.
        */
        if (bdp->cbd_sc & BD_SC_WRAP)
                bdp = info->tx_bd_base;
        else
                bdp++;

        info->tx_cur = (cbd_t *)bdp;
}

/*
 * ------------------------------------------------------------
 * rs_throttle()
 *
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 * ------------------------------------------------------------
 */
static void rs_8xx_throttle(struct tty_struct * tty)
{
        ser_info_t *info = (ser_info_t *)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->name, "rs_throttle"))
                return;

        if (I_IXOFF(tty))
                rs_8xx_send_xchar(tty, STOP_CHAR(tty));

#ifdef modem_control
        if (tty->termios->c_cflag & CRTSCTS)
                info->MCR &= ~UART_MCR_RTS;

        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
#endif
}

static void rs_8xx_unthrottle(struct tty_struct * tty)
{
        ser_info_t *info = (ser_info_t *)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->name, "rs_unthrottle"))
                return;

        if (I_IXOFF(tty)) {
                if (info->x_char)
                        info->x_char = 0;
                else
                        rs_8xx_send_xchar(tty, START_CHAR(tty));
        }
#ifdef modem_control
        if (tty->termios->c_cflag & CRTSCTS)
                info->MCR |= UART_MCR_RTS;
        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
#endif
}

/*
 * ------------------------------------------------------------
 * rs_ioctl() and friends
 * ------------------------------------------------------------
 */

#ifdef maybe
/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *          is emptied.  On bus types like RS485, the transmitter must
 *          release the bus after transmitting. This must be done when
 *          the transmit shift register is empty, not be done when the
 *          transmit holding register is empty.  This functionality
 *          allows an RS485 driver to be written in user space.
 */
static int get_lsr_info(struct async_struct * info, unsigned int *value)
{
        unsigned char status;
        unsigned int result;

        cli();
        status = serial_in(info, UART_LSR);
        sti();
        result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
        return put_user(result,value);
}
#endif

static int get_modem_info(ser_info_t *info, unsigned int *value)
{
        unsigned int result = 0;
#ifdef modem_control
        unsigned char control, status;

        control = info->MCR;
        cli();
        status = serial_in(info, UART_MSR);
        sti();
        result =  ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
                | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
#ifdef TIOCM_OUT1
                | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
                | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
#endif
                | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
                | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
                | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
                | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
#endif
        return put_user(result,value);
}

static int set_modem_info(ser_info_t *info, unsigned int cmd,
                          unsigned int *value)
{
        int error;
        unsigned int arg;

        error = get_user(arg, value);
        if (error)
                return error;
#ifdef modem_control
        switch (cmd) {
        case TIOCMBIS:
                if (arg & TIOCM_RTS)
                        info->MCR |= UART_MCR_RTS;
                if (arg & TIOCM_DTR)
                        info->MCR |= UART_MCR_DTR;
#ifdef TIOCM_OUT1
                if (arg & TIOCM_OUT1)
                        info->MCR |= UART_MCR_OUT1;
                if (arg & TIOCM_OUT2)
                        info->MCR |= UART_MCR_OUT2;
#endif
                break;
        case TIOCMBIC:
                if (arg & TIOCM_RTS)
                        info->MCR &= ~UART_MCR_RTS;
                if (arg & TIOCM_DTR)
                        info->MCR &= ~UART_MCR_DTR;
#ifdef TIOCM_OUT1
                if (arg & TIOCM_OUT1)
                        info->MCR &= ~UART_MCR_OUT1;
                if (arg & TIOCM_OUT2)
                        info->MCR &= ~UART_MCR_OUT2;
#endif
                break;
        case TIOCMSET:
                info->MCR = ((info->MCR & ~(UART_MCR_RTS |
#ifdef TIOCM_OUT1
                                            UART_MCR_OUT1 |
                                            UART_MCR_OUT2 |
#endif
                                            UART_MCR_DTR))
                             | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
#ifdef TIOCM_OUT1
                             | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
                             | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
#endif
                             | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
                break;
        default:
                return -EINVAL;
        }
        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
#endif
        return 0;
}

/* Sending a break is a two step process on the SMC/SCC.  It is accomplished
 * by sending a STOP TRANSMIT command followed by a RESTART TRANSMIT
 * command.  We take advantage of the begin/end functions to make this
 * happen.
 */
static ushort   smc_chan_map[] = {
        CPM_CR_CH_SMC1,
        CPM_CR_CH_SMC2
};

static ushort   scc_chan_map[] = {
        CPM_CR_CH_SCC1,
        CPM_CR_CH_SCC2,
        CPM_CR_CH_SCC3,
        CPM_CR_CH_SCC4
};

static void begin_break(ser_info_t *info)
{
        volatile cpm8xx_t *cp;
        ushort  chan;
        int     idx;

        cp = cpmp;

        idx = PORT_NUM(info->state->smc_scc_num);
        if (info->state->smc_scc_num & NUM_IS_SCC)
                chan = scc_chan_map[idx];
        else
                chan = smc_chan_map[idx];
        cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG;
        while (cp->cp_cpcr & CPM_CR_FLG);
}

static void end_break(ser_info_t *info)
{
        volatile cpm8xx_t *cp;
        ushort  chan;
        int     idx;

        cp = cpmp;

        idx = PORT_NUM(info->state->smc_scc_num);
        if (info->state->smc_scc_num & NUM_IS_SCC)
                chan = scc_chan_map[idx];
        else
                chan = smc_chan_map[idx];
        cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_RESTART_TX) | CPM_CR_FLG;
        while (cp->cp_cpcr & CPM_CR_FLG);
}

/*
 * This routine sends a break character out the serial port.
 */
static void send_break(ser_info_t *info, int duration)
{
        current->state = TASK_INTERRUPTIBLE;
#ifdef SERIAL_DEBUG_SEND_BREAK
        printk("rs_send_break(%d) jiff=%lu...", duration, jiffies);
#endif
        begin_break(info);
        schedule_timeout(duration);
        end_break(info);
#ifdef SERIAL_DEBUG_SEND_BREAK
        printk("done jiffies=%lu\n", jiffies);
#endif
}


static int rs_8xx_ioctl(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg)
{
        int error;
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        int retval;
        struct async_icount cnow;       /* kernel counter temps */
        struct serial_icounter_struct *p_cuser; /* user space */

        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
                return -ENODEV;

        if ((cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
                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 (signal_pending(current))
                                return -EINTR;
                        if (!arg) {
                                send_break(info, HZ/4); /* 1/4 second */
                                if (signal_pending(current))
                                        return -EINTR;
                        }
                        return 0;
                case TCSBRKP:   /* support for POSIX tcsendbreak() */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        if (signal_pending(current))
                                return -EINTR;
                        send_break(info, arg ? arg*(HZ/10) : HZ/4);
                        if (signal_pending(current))
                                return -EINTR;
                        return 0;
                case TIOCSBRK:
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        begin_break(info);
                        return 0;
                case TIOCCBRK:
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        end_break(info);
                        return 0;
                case TIOCGSOFTCAR:
                        return put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg);
                case TIOCSSOFTCAR:
                        error = get_user(arg, (unsigned int *) arg);
                        if (error)
                                return error;
                        tty->termios->c_cflag =
                                ((tty->termios->c_cflag & ~CLOCAL) |
                                 (arg ? CLOCAL : 0));
                        return 0;
                case TIOCMGET:
                        return get_modem_info(info, (unsigned int *) arg);
                case TIOCMBIS:
                case TIOCMBIC:
                case TIOCMSET:
                        return set_modem_info(info, cmd, (unsigned int *) arg);
#ifdef maybe
                case TIOCSERGETLSR: /* Get line status register */
                        return get_lsr_info(info, (unsigned int *) arg);
#endif
                /*
                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
                 * - mask passed in arg for lines of interest
                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
                 * Caller should use TIOCGICOUNT to see which one it was
                 */
                 case TIOCMIWAIT:
#ifdef modem_control
                        cli();
                        /* note the counters on entry */
                        cprev = info->state->icount;
                        sti();
                        while (1) {
                                interruptible_sleep_on(&info->delta_msr_wait);
                                /* see if a signal did it */
                                if (signal_pending(current))
                                        return -ERESTARTSYS;
                                cli();
                                cnow = info->state->icount; /* atomic copy */
                                sti();
                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
                                        return -EIO; /* no change => error */
                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
                                        return 0;
                                }
                                cprev = cnow;
                        }
                        /* NOTREACHED */
#else
                        return 0;
#endif

                /*
                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
                 * Return: write counters to the user passed counter struct
                 * NB: both 1->0 and 0->1 transitions are counted except for
                 *     RI where only 0->1 is counted.
                 */
                case TIOCGICOUNT:
                        cli();
                        cnow = info->state->icount;
                        sti();
                        p_cuser = (struct serial_icounter_struct *) arg;
                        error = put_user(cnow.cts, &p_cuser->cts);
                        if (error) return error;
                        error = put_user(cnow.dsr, &p_cuser->dsr);
                        if (error) return error;
                        error = put_user(cnow.rng, &p_cuser->rng);
                        if (error) return error;
                        error = put_user(cnow.dcd, &p_cuser->dcd);
                        if (error) return error;
                        return 0;

                default:
                        return -ENOIOCTLCMD;
                }
        return 0;
}

/* FIX UP modem control here someday......
*/
static void rs_8xx_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;

        if (   (tty->termios->c_cflag == old_termios->c_cflag)
            && (   RELEVANT_IFLAG(tty->termios->c_iflag)
                == RELEVANT_IFLAG(old_termios->c_iflag)))
          return;

        change_speed(info);

#ifdef modem_control
        /* Handle transition to B0 status */
        if ((old_termios->c_cflag & CBAUD) &&
            !(tty->termios->c_cflag & CBAUD)) {
                info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
                cli();
                serial_out(info, UART_MCR, info->MCR);
                sti();
        }

        /* Handle transition away from B0 status */
        if (!(old_termios->c_cflag & CBAUD) &&
            (tty->termios->c_cflag & CBAUD)) {
                info->MCR |= UART_MCR_DTR;
                if (!tty->hw_stopped ||
                    !(tty->termios->c_cflag & CRTSCTS)) {
                        info->MCR |= UART_MCR_RTS;
                }
                cli();
                serial_out(info, UART_MCR, info->MCR);
                sti();
        }

        /* Handle turning off CRTSCTS */
        if ((old_termios->c_cflag & CRTSCTS) &&
            !(tty->termios->c_cflag & CRTSCTS)) {
                tty->hw_stopped = 0;
                rs_8xx_start(tty);
        }
#endif

#if 0
        /*
         * No need to wake up processes in open wait, since they
         * sample the CLOCAL flag once, and don't recheck it.
         * XXX  It's not clear whether the current behavior is correct
         * or not.  Hence, this may change.....
         */
        if (!(old_termios->c_cflag & CLOCAL) &&
            (tty->termios->c_cflag & CLOCAL))
                wake_up_interruptible(&info->open_wait);
#endif
}

/*
 * ------------------------------------------------------------
 * rs_close()
 *
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we unlink its
 * async structure from the interrupt chain if necessary, and we free
 * that IRQ if nothing is left in the chain.
 * ------------------------------------------------------------
 */
static void rs_8xx_close(struct tty_struct *tty, struct file * filp)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        struct serial_state *state;
        unsigned long   flags;
        int             idx;
        volatile smc_t  *smcp;
        volatile scc_t  *sccp;

        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
                return;

        state = info->state;

        save_flags(flags); cli();

        if (tty_hung_up_p(filp)) {
                DBG_CNT("before DEC-hung");
                restore_flags(flags);
                return;
        }

#ifdef SERIAL_DEBUG_OPEN
        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
#endif
        if ((tty->count == 1) && (state->count != 1)) {
                /*
                 * Uh, oh.  tty->count is 1, which means that the tty
                 * structure will be freed.  state->count should always
                 * be one in these conditions.  If it's greater than
                 * one, we've got real problems, since it means the
                 * serial port won't be shutdown.
                 */
                printk("rs_close: bad serial port count; tty->count is 1, "
                       "state->count is %d\n", state->count);
                state->count = 1;
        }
        if (--state->count < 0) {
                printk("rs_close: bad serial port count for ttys%d: %d\n",
                       info->line, state->count);
                state->count = 0;
        }
        if (state->count) {
                DBG_CNT("before DEC-2");
                restore_flags(flags);
                return;
        }
        info->flags |= ASYNC_CLOSING;
        /*
         * Now we wait for the transmit buffer to clear; and we notify
         * the line discipline to only process XON/XOFF characters.
         */
        tty->closing = 1;
        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, info->closing_wait);
        /*
         * At this point we stop accepting input.  To do this, we
         * disable the receive line status interrupts, and tell the
         * interrupt driver to stop checking the data ready bit in the
         * line status register.
         */
        info->read_status_mask &= ~BD_SC_EMPTY;
        if (info->flags & ASYNC_INITIALIZED) {
                idx = PORT_NUM(info->state->smc_scc_num);
                if (info->state->smc_scc_num & NUM_IS_SCC) {
                        sccp = &cpmp->cp_scc[idx];
                        sccp->scc_sccm &= ~UART_SCCM_RX;
                        sccp->scc_gsmrl &= ~SCC_GSMRL_ENR;
                }
                else {
                        smcp = &cpmp->cp_smc[idx];
                        smcp->smc_smcm &= ~SMCM_RX;
                        smcp->smc_smcmr &= ~SMCMR_REN;
                }
                /*
                 * Before we drop DTR, make sure the UART transmitter
                 * has completely drained; this is especially
                 * important if there is a transmit FIFO!
                 */
                rs_8xx_wait_until_sent(tty, info->timeout);
        }
        shutdown(info);
        if (tty->driver->flush_buffer)
                tty->driver->flush_buffer(tty);
        if (tty->ldisc.flush_buffer)
                tty->ldisc.flush_buffer(tty);
        tty->closing = 0;
        info->event = 0;
        info->tty = 0;
        if (info->blocked_open) {
                if (info->close_delay) {
                        current->state = TASK_INTERRUPTIBLE;
                        schedule_timeout(info->close_delay);
                }
                wake_up_interruptible(&info->open_wait);
        }
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
        wake_up_interruptible(&info->close_wait);
        restore_flags(flags);
}

/*
 * rs_wait_until_sent() --- wait until the transmitter is empty
 */
static void rs_8xx_wait_until_sent(struct tty_struct *tty, int timeout)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        unsigned long orig_jiffies, char_time;
        /*int lsr;*/
        volatile cbd_t *bdp;

        if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
                return;

#ifdef maybe
        if (info->state->type == PORT_UNKNOWN)
                return;
#endif

        orig_jiffies = jiffies;
        /*
         * Set the check interval to be 1/5 of the estimated time to
         * send a single character, and make it at least 1.  The check
         * interval should also be less than the timeout.
         *
         * Note: we have to use pretty tight timings here to satisfy
         * the NIST-PCTS.
         */
        char_time = 1;
        if (timeout)
                char_time = min(char_time, timeout);
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
        printk("jiff=%lu...", jiffies);
#endif

        /* We go through the loop at least once because we can't tell
         * exactly when the last character exits the shifter.  There can
         * be at least two characters waiting to be sent after the buffers
         * are empty.
         */
        do {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
                printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
                current->state = TASK_INTERRUPTIBLE;
/*              current->dyn_prio = 0;   make us low-priority */
                schedule_timeout(char_time);
                if (signal_pending(current))
                        break;
                if (timeout && time_after(jiffies, orig_jiffies + timeout))
                        break;

                /* The 'tx_cur' is really the next buffer to send.  We
                 * have to back up to the previous BD and wait for it
                 * to go.  This isn't perfect, because all this indicates
                 * is the buffer is available.  There are still characters
                 * in the CPM FIFO.
                 */
                bdp = info->tx_cur;
                if (bdp == info->tx_bd_base)
                        bdp += (TX_NUM_FIFO-1);
                else
                        bdp--;
        } while (bdp->cbd_sc & BD_SC_READY);
        current->state = TASK_RUNNING;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
}

/*
 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 */
static void rs_8xx_hangup(struct tty_struct *tty)
{
        ser_info_t *info = (ser_info_t *)tty->driver_data;
        struct serial_state *state = info->state;

        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
                return;

        state = info->state;

        rs_8xx_flush_buffer(tty);
        shutdown(info);
        info->event = 0;
        state->count = 0;
        info->flags &= ~ASYNC_NORMAL_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,
                           ser_info_t *info)
{
#ifdef DO_THIS_LATER
        DECLARE_WAITQUEUE(wait, current);
#endif
        struct serial_state *state = info->state;
        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 (tty_hung_up_p(filp) ||
            (info->flags & ASYNC_CLOSING)) {
                if (info->flags & ASYNC_CLOSING)
                        interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
                if (info->flags & ASYNC_HUP_NOTIFY)
                        return -EAGAIN;
                else
                        return -ERESTARTSYS;
#else
                return -EAGAIN;
#endif
        }

        /*
         * If non-blocking mode is set, or the port is not enabled,
         * then make the check up front and then exit.
         * If this is an SMC port, we don't have modem control to wait
         * for, so just get out here.
         */
        if ((filp->f_flags & O_NONBLOCK) ||
            (tty->flags & (1 << TTY_IO_ERROR)) ||
            !(info->state->smc_scc_num & NUM_IS_SCC)) {
                info->flags |= ASYNC_NORMAL_ACTIVE;
                return 0;
        }

        if (tty->termios->c_cflag & CLOCAL)
                do_clocal = 1;

        /*
         * Block waiting for the carrier detect and the line to become
         * free (i.e., not in use by the callout).  While we are in
         * this loop, state->count is dropped by one, so that
         * rs_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
#ifdef DO_THIS_LATER
        add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready before block: ttys%d, count = %d\n",
               state->line, state->count);
#endif
        cli();
        if (!tty_hung_up_p(filp))
                state->count--;
        sti();
        info->blocked_open++;
        while (1) {
                cli();
                if ((tty->termios->c_cflag & CBAUD))
                        serial_out(info, UART_MCR,
                                   serial_inp(info, UART_MCR) |
                                   (UART_MCR_DTR | UART_MCR_RTS));
                sti();
                set_current_state(TASK_INTERRUPTIBLE);
                if (tty_hung_up_p(filp) ||
                    !(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
                        if (info->flags & ASYNC_HUP_NOTIFY)
                                retval = -EAGAIN;
                        else
                                retval = -ERESTARTSYS;
#else
                        retval = -EAGAIN;
#endif
                        break;
                }
                if (!(info->flags & ASYNC_CLOSING) &&
                    (do_clocal || (serial_in(info, UART_MSR) &
                                   UART_MSR_DCD)))
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }
#ifdef SERIAL_DEBUG_OPEN
                printk("block_til_ready blocking: ttys%d, count = %d\n",
                       info->line, state->count);
#endif
                schedule();
        }
        current->state = TASK_RUNNING;
        remove_wait_queue(&info->open_wait, &wait);
        if (!tty_hung_up_p(filp))
                state->count++;
        info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready after blocking: ttys%d, count = %d\n",
               info->line, state->count);
#endif
#endif /* DO_THIS_LATER */
        if (retval)
                return retval;
        info->flags |= ASYNC_NORMAL_ACTIVE;
        return 0;
}

static int get_async_struct(int line, ser_info_t **ret_info)
{
        struct serial_state *sstate;

        sstate = rs_table + line;
        if (sstate->info) {
                sstate->count++;
                *ret_info = (ser_info_t *)sstate->info;
                return 0;
        }
        else {
                return -ENOMEM;
        }
}

/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port, linking in its async structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 */
static int rs_8xx_open(struct tty_struct *tty, struct file * filp)
{
        ser_info_t      *info;
        int             retval, line;

        line = tty->index;
        if ((line < 0) || (line >= NR_PORTS))
                return -ENODEV;
        retval = get_async_struct(line, &info);
        if (retval)
                return retval;
        if (serial_paranoia_check(info, tty->name, "rs_open"))
                return -ENODEV;

#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open %s, count = %d\n", tty->name, info->state->count);
#endif
        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;
        }

#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open %s successful...", tty->name);
#endif
        return 0;
}

/*
 * /proc fs routines....
 */

static inline int line_info(char *buf, struct serial_state *state)
{
#ifdef notdef
        struct async_struct *info = state->info, scr_info;
        char    stat_buf[30], control, status;
#endif
        int     ret;

        ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
                      state->line,
                      (state->smc_scc_num & NUM_IS_SCC) ? "SCC" : "SMC",
                      (unsigned int)(state->port), state->irq);

        if (!state->port || (state->type == PORT_UNKNOWN)) {
                ret += sprintf(buf+ret, "\n");
                return ret;
        }

#ifdef notdef
        /*
         * Figure out the current RS-232 lines
         */
        if (!info) {
                info = &scr_info;       /* This is just for serial_{in,out} */

                info->magic = SERIAL_MAGIC;
                info->port = state->port;
                info->flags = state->flags;
                info->quot = 0;
                info->tty = 0;
        }
        cli();
        status = serial_in(info, UART_MSR);
        control = info ? info->MCR : serial_in(info, UART_MCR);
        sti();

        stat_buf[0] = 0;
        stat_buf[1] = 0;
        if (control & UART_MCR_RTS)
                strcat(stat_buf, "|RTS");
        if (status & UART_MSR_CTS)
                strcat(stat_buf, "|CTS");
        if (control & UART_MCR_DTR)
                strcat(stat_buf, "|DTR");
        if (status & UART_MSR_DSR)
                strcat(stat_buf, "|DSR");
        if (status & UART_MSR_DCD)
                strcat(stat_buf, "|CD");
        if (status & UART_MSR_RI)
                strcat(stat_buf, "|RI");

        if (info->quot) {
                ret += sprintf(buf+ret, " baud:%d",
                               state->baud_base / info->quot);
        }

        ret += sprintf(buf+ret, " tx:%d rx:%d",
                      state->icount.tx, state->icount.rx);

        if (state->icount.frame)
                ret += sprintf(buf+ret, " fe:%d", state->icount.frame);

        if (state->icount.parity)
                ret += sprintf(buf+ret, " pe:%d", state->icount.parity);

        if (state->icount.brk)
                ret += sprintf(buf+ret, " brk:%d", state->icount.brk);

        if (state->icount.overrun)
                ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);

        /*
         * Last thing is the RS-232 status lines
         */
        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
#endif
        return ret;
}

int rs_8xx_read_proc(char *page, char **start, off_t off, int count,
                 int *eof, void *data)
{
        int i, len = 0;
        off_t   begin = 0;

        len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
        for (i = 0; i < NR_PORTS && len < 4000; i++) {
                len += line_info(page + len, &rs_table[i]);
                if (len+begin > off+count)
                        goto done;
                if (len+begin < off) {
                        begin += len;
                        len = 0;
                }
        }
        *eof = 1;
done:
        if (off >= len+begin)
                return 0;
        *start = page + (begin-off);
        return ((count < begin+len-off) ? count : begin+len-off);
}

/*
 * ---------------------------------------------------------------------
 * rs_init() and friends
 *
 * rs_init() is called at boot-time to initialize the serial driver.
 * ---------------------------------------------------------------------
 */

/*
 * This routine prints out the appropriate serial driver version
 * number, and identifies which options were configured into this
 * driver.
 */
static _INLINE_ void show_serial_version(void)
{
        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
}


/*
 * The serial console driver used during boot.  Note that these names
 * clash with those found in "serial.c", so we currently can't support
 * the 16xxx uarts and these at the same time.  I will fix this to become
 * an indirect function call from tty_io.c (or something).
 */

#ifdef CONFIG_SERIAL_CONSOLE

/* I need this just so I can store the virtual addresses and have
 * common functions for the early console printing.
 */
static ser_info_t consinfo;

/*
 * Print a string to the serial port trying not to disturb any possible
 * real use of the port...
 */
static void my_console_write(int idx, const char *s,
                                unsigned count)
{
        struct          serial_state    *ser;
        ser_info_t                      *info;
        unsigned                        i;
        volatile        cbd_t           *bdp, *bdbase;
        volatile        smc_uart_t      *up;
        volatile        u_char          *cp;

        ser = rs_table + idx;

        /* If the port has been initialized for general use, we have
         * to use the buffer descriptors allocated there.  Otherwise,
         * we simply use the single buffer allocated.
         */
        if ((info = (ser_info_t *)ser->info) != NULL) {
                bdp = info->tx_cur;
                bdbase = info->tx_bd_base;
        }
        else {
                /* Pointer to UART in parameter ram.
                */
                up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];

                /* Get the address of the host memory buffer.
                 */
                bdp = bdbase = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];

                info = &consinfo;
        }

        /*
         * We need to gracefully shut down the transmitter, disable
         * interrupts, then send our bytes out.
         */

        /*
         * Now, do each character.  This is not as bad as it looks
         * since this is a holding FIFO and not a transmitting FIFO.
         * We could add the complexity of filling the entire transmit
         * buffer, but we would just wait longer between accesses......
         */
        for (i = 0; i < count; i++, s++) {
                /* Wait for transmitter fifo to empty.
                 * Ready indicates output is ready, and xmt is doing
                 * that, not that it is ready for us to send.
                 */
                while (bdp->cbd_sc & BD_SC_READY);

                /* Send the character out.
                 * If the buffer address is in the CPM DPRAM, don't
                 * convert it.
                 */
                if ((uint)(bdp->cbd_bufaddr) > (uint)IMAP_ADDR)
                        cp = (u_char *)(bdp->cbd_bufaddr);
                else
                        cp = info->tx_va_base + ((bdp - info->tx_bd_base) * TX_BUF_SIZE);
                *cp = *s;

                bdp->cbd_datlen = 1;
                bdp->cbd_sc |= BD_SC_READY;

                if (bdp->cbd_sc & BD_SC_WRAP)
                        bdp = bdbase;
                else
                        bdp++;

                /* if a LF, also do CR... */
                if (*s == 10) {
                        while (bdp->cbd_sc & BD_SC_READY);
                        cp = info->tx_va_base + ((bdp - info->tx_bd_base) * TX_BUF_SIZE);
                        *cp = 13;
                        bdp->cbd_datlen = 1;
                        bdp->cbd_sc |= BD_SC_READY;

                        if (bdp->cbd_sc & BD_SC_WRAP) {
                                bdp = bdbase;
                        }
                        else {
                                bdp++;
                        }
                }
        }

        /*
         * Finally, Wait for transmitter & holding register to empty
         *  and restore the IER
         */
        while (bdp->cbd_sc & BD_SC_READY);

        if (info)
                info->tx_cur = (cbd_t *)bdp;
}

static void serial_console_write(struct console *c, const char *s,
                                unsigned count)
{
#ifdef CONFIG_KGDB_CONSOLE
        /* Try to let stub handle output. Returns true if it did. */
        if (kgdb_output_string(s, count))
                return;
#endif
        my_console_write(c->index, s, count);
}

#ifdef CONFIG_XMON
int
xmon_8xx_write(const char *s, unsigned count)
{
        my_console_write(0, s, count);
        return(count);
}
#endif

#ifdef CONFIG_KGDB
void
putDebugChar(char ch)
{
        my_console_write(0, &ch, 1);
}
#endif

/*
 * Receive character from the serial port.  This only works well
 * before the port is initialized for real use.
 */
static int my_console_wait_key(int idx, int xmon, char *obuf)
{
        struct serial_state             *ser;
        u_char                          c, *cp;
        ser_info_t                      *info;
        volatile        cbd_t           *bdp;
        volatile        smc_uart_t      *up;
        int                             i;

        ser = rs_table + idx;

        /* Pointer to UART in parameter ram.
        */
        up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];

        /* Get the address of the host memory buffer.
         * If the port has been initialized for general use, we must
         * use information from the port structure.
         */
        if ((info = (ser_info_t *)ser->info)) {
                bdp = info->rx_cur;
        }
        else {
                bdp = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
                info = &consinfo;
        }

        /*
         * We need to gracefully shut down the receiver, disable
         * interrupts, then read the input.
         * XMON just wants a poll.  If no character, return -1, else
         * return the character.
         */
        if (!xmon) {
                while (bdp->cbd_sc & BD_SC_EMPTY);
        }
        else {
                if (bdp->cbd_sc & BD_SC_EMPTY)
                        return -1;
        }

        /* If the buffer address is in the CPM DPRAM, don't
         * convert it.
         */
        if ((uint)(bdp->cbd_bufaddr) > (uint)IMAP_ADDR)
                cp = (u_char *)(bdp->cbd_bufaddr);
        else
                cp = info->rx_va_base + ((bdp - info->rx_bd_base) * RX_BUF_SIZE);

        if (obuf) {
                i = c = bdp->cbd_datlen;
                while (i-- > 0)
                        *obuf++ = *cp++;
        }
        else {
                c = *cp;
        }
        bdp->cbd_sc |= BD_SC_EMPTY;

        if (info) {
                if (bdp->cbd_sc & BD_SC_WRAP) {
                        bdp = info->rx_bd_base;
                }
                else {
                        bdp++;
                }
                info->rx_cur = (cbd_t *)bdp;
        }

        return((int)c);
}

#ifdef CONFIG_XMON
int
xmon_8xx_read_poll(void)
{
        return(my_console_wait_key(0, 1, NULL));
}

int
xmon_8xx_read_char(void)
{
        return(my_console_wait_key(0, 0, NULL));
}
#endif

#ifdef CONFIG_KGDB
static char kgdb_buf[RX_BUF_SIZE], *kgdp;
static int kgdb_chars;

char
getDebugChar(void)
{
        if (kgdb_chars <= 0) {
                kgdb_chars = my_console_wait_key(0, 0, kgdb_buf);
                kgdp = kgdb_buf;
        }
        kgdb_chars--;

        return(*kgdp++);
}

void kgdb_interruptible(int yes)
{
        volatile smc_t  *smcp;

        smcp = &cpmp->cp_smc[KGDB_SER_IDX];

        if (yes == 1)
                smcp->smc_smcm |= SMCM_RX;
        else
                smcp->smc_smcm &= ~SMCM_RX;
}

void kgdb_map_scc(void)
{
        struct          serial_state *ser;
        uint            mem_addr;
        volatile        cbd_t           *bdp;
        volatile        smc_uart_t      *up;

        cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);

        /* To avoid data cache CPM DMA coherency problems, allocate a
         * buffer in the CPM DPRAM.  This will work until the CPM and
         * serial ports are initialized.  At that time a memory buffer
         * will be allocated.
         * The port is already initialized from the boot procedure, all
         * we do here is give it a different buffer and make it a FIFO.
         */

        ser = rs_table;

        /* Right now, assume we are using SMCs.
        */
        up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];

        /* Allocate space for an input FIFO, plus a few bytes for output.
         * Allocate bytes to maintain word alignment.
         */
        mem_addr = (uint)(&cpmp->cp_dpmem[0xa00]);

        /* Set the physical address of the host memory buffers in
         * the buffer descriptors.
         */
        bdp = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
        bdp->cbd_bufaddr = mem_addr;

        bdp = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];
        bdp->cbd_bufaddr = mem_addr+RX_BUF_SIZE;

        up->smc_mrblr = RX_BUF_SIZE;            /* receive buffer length */
        up->smc_maxidl = RX_BUF_SIZE;
}
#endif

static struct tty_driver *serial_console_device(struct console *c, int *index)
{
        *index = c->index;
        return serial_driver;
}

/*
 *      Register console.
 */
static void __init console_8xx_init(long kmem_start, long kmem_end)
{
        register_console(&sercons);
}
console_initcall(console_8xx_init);
#endif

/* Index in baud rate table of the default console baud rate.
*/
static  int     baud_idx;

static struct tty_operations rs_8xx_ops = {
        .open = rs_8xx_open,
        .close = rs_8xx_close,
        .write = rs_8xx_write,
        .put_char = rs_8xx_put_char,
        .write_room = rs_8xx_write_room,
        .chars_in_buffer = rs_8xx_chars_in_buffer,
        .flush_buffer = rs_8xx_flush_buffer,
        .ioctl = rs_8xx_ioctl,
        .throttle = rs_8xx_throttle,
        .unthrottle = rs_8xx_unthrottle,
        .send_xchar = rs_8xx_send_xchar,
        .set_termios = rs_8xx_set_termios,
        .stop = rs_8xx_stop,
        .start = rs_8xx_start,
        .hangup = rs_8xx_hangup,
        .wait_until_sent = rs_8xx_wait_until_sent,
        .read_proc = rs_8xx_read_proc,
};

/*
 * The serial driver boot-time initialization code!
 */
static int __init rs_8xx_init(void)
{
        struct serial_state * state;
        ser_info_t      *info;
        uint            mem_addr, iobits, dp_offset;
        int             i, j, idx;
        ushort          chan;
        volatile        cbd_t           *bdp;
        volatile        cpm8xx_t        *cp;
        volatile        smc_t           *sp;
        volatile        smc_uart_t      *up;
        volatile        scc_t           *scp;
        volatile        scc_uart_t      *sup;
        volatile        immap_t         *immap;

        serial_driver = alloc_tty_driver(NR_PORTS);
        if (!serial_driver)
                return -ENOMEM;

        init_bh(SERIAL_BH, do_serial_bh);

        show_serial_version();

        /* Initialize the tty_driver structure */

        serial_driver->owner = THIS_MODULE;
        serial_driver->driver_name = "serial";
        serial_driver->devfs_name = "tts/";
        serial_driver->name = "ttyS";
        serial_driver->major = TTY_MAJOR;
        serial_driver->minor_start = 64;
        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 =
                baud_idx | CS8 | CREAD | HUPCL | CLOCAL;
        serial_driver->flags = TTY_DRIVER_REAL_RAW;
        tty_set_operations(serial_driver, &rs_8xx_ops);

        if (tty_register_driver(serial_driver))
                panic("Couldn't register serial driver\n");

        cp = cpmp;      /* Get pointer to Communication Processor */
        immap = (immap_t *)IMAP_ADDR;   /* and to internal registers */


        /* Configure SCC2, SCC3, and SCC4 instead of port A parallel I/O.
         */
#ifdef CONFIG_USE_SCC_IO
#ifndef CONFIG_MBX
        /* The "standard" configuration through the 860.
        */
        immap->im_ioport.iop_papar |= 0x00fc;
        immap->im_ioport.iop_padir &= ~0x00fc;
        immap->im_ioport.iop_paodr &= ~0x00fc;
#else
        /* On the MBX, SCC3 is through Port D.
        */
        immap->im_ioport.iop_papar |= 0x000c;   /* SCC2 on port A */
        immap->im_ioport.iop_padir &= ~0x000c;
        immap->im_ioport.iop_paodr &= ~0x000c;

        immap->im_ioport.iop_pdpar |= 0x0030;   /* SCC3 on port D */
#endif

        /* Since we don't yet do modem control, connect the port C pins
         * as general purpose I/O.  This will assert CTS and CD for the
         * SCC ports.
         */
        immap->im_ioport.iop_pcdir |= 0x03c6;
        immap->im_ioport.iop_pcpar &= ~0x03c6;

        /* Connect SCC2 and SCC3 to NMSI.  Connect BRG3 to SCC2 and
         * BRG4 to SCC3.
         */
        cp->cp_sicr &= ~0x00ffff00;
        cp->cp_sicr |= 0x001b1200;

#ifdef CONFIG_PP04
        /* Frequentis PP04 forced to RS-232 until we know better.
         * Port C 12 and 13 low enables RS-232 on SCC3 and SCC4.
         */
        immap->im_ioport.iop_pcdir |= 0x000c;
        immap->im_ioport.iop_pcpar &= ~0x000c;
        immap->im_ioport.iop_pcdat &= ~0x000c;

        /* This enables the TX driver.
        */
        cp->cp_pbpar &= ~0x6000;
        cp->cp_pbdat &= ~0x6000;
#endif
#endif

        for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
                state->magic = SSTATE_MAGIC;
                state->line = i;
                state->type = PORT_UNKNOWN;
                state->custom_divisor = 0;
                state->close_delay = 5*HZ/10;
                state->closing_wait = 30*HZ;
                state->icount.cts = state->icount.dsr =
                        state->icount.rng = state->icount.dcd = 0;
                state->icount.rx = state->icount.tx = 0;
                state->icount.frame = state->icount.parity = 0;
                state->icount.overrun = state->icount.brk = 0;
                printk(KERN_INFO "ttyS%d at 0x%04x is a %s\n",
                       i, (unsigned int)(state->port),
                       (state->smc_scc_num & NUM_IS_SCC) ? "SCC" : "SMC");
#ifdef CONFIG_SERIAL_CONSOLE
                /* If we just printed the message on the console port, and
                 * we are about to initialize it for general use, we have
                 * to wait a couple of character times for the CR/NL to
                 * make it out of the transmit buffer.
                 */
                if (i == CONFIG_SERIAL_CONSOLE_PORT)
                        mdelay(2);
#endif
                info = kmalloc(sizeof(ser_info_t), GFP_KERNEL);
                if (info) {
                        __clear_user(info,sizeof(ser_info_t));
                        init_waitqueue_head(&info->open_wait);
                        init_waitqueue_head(&info->close_wait);
                        info->magic = SERIAL_MAGIC;
                        info->flags = state->flags;
                        info->tqueue.routine = do_softint;
                        info->tqueue.data = info;
                        info->tqueue_hangup.routine = do_serial_hangup;
                        info->tqueue_hangup.data = info;
                        info->line = i;
                        info->state = state;
                        state->info = (struct async_struct *)info;

                        /* We need to allocate a transmit and receive buffer
                         * descriptors from dual port ram, and a character
                         * buffer area from host mem.
                         */
                        dp_offset = cpm_dpalloc(sizeof(cbd_t) * RX_NUM_FIFO, 8);

                        /* Allocate space for FIFOs in the host memory.
                        */
                        mem_addr = m8xx_cpm_hostalloc(RX_NUM_FIFO * RX_BUF_SIZE);
                        info->rx_va_base = (unsigned char *)mem_addr;

                        /* Set the physical address of the host memory
                         * buffers in the buffer descriptors, and the
                         * virtual address for us to work with.
                         */
                        bdp = (cbd_t *)&cp->cp_dpmem[dp_offset];
                        info->rx_cur = info->rx_bd_base = (cbd_t *)bdp;

                        for (j=0; j<(RX_NUM_FIFO-1); j++) {
                                bdp->cbd_bufaddr = iopa(mem_addr);
                                bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
                                mem_addr += RX_BUF_SIZE;
                                bdp++;
                        }
                        bdp->cbd_bufaddr = iopa(mem_addr);
                        bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;

                        idx = PORT_NUM(info->state->smc_scc_num);
                        if (info->state->smc_scc_num & NUM_IS_SCC) {
                                scp = &cp->cp_scc[idx];
                                sup = (scc_uart_t *)&cp->cp_dparam[state->port];
                                sup->scc_genscc.scc_rbase = dp_offset;
                        }
                        else {
                                sp = &cp->cp_smc[idx];
                                up = (smc_uart_t *)&cp->cp_dparam[state->port];
                                up->smc_rbase = dp_offset;
                        }

                        dp_offset = cpm_dpalloc(sizeof(cbd_t) * TX_NUM_FIFO, 8);

                        /* Allocate space for FIFOs in the host memory.
                        */
                        mem_addr = m8xx_cpm_hostalloc(TX_NUM_FIFO * TX_BUF_SIZE);
                        info->tx_va_base = (unsigned char *)mem_addr;

                        /* Set the physical address of the host memory
                         * buffers in the buffer descriptors, and the
                         * virtual address for us to work with.
                         */
                        bdp = (cbd_t *)&cp->cp_dpmem[dp_offset];
                        info->tx_cur = info->tx_bd_base = (cbd_t *)bdp;

                        for (j=0; j<(TX_NUM_FIFO-1); j++) {
                                bdp->cbd_bufaddr = iopa(mem_addr);
                                bdp->cbd_sc = BD_SC_INTRPT;
                                mem_addr += TX_BUF_SIZE;
                                bdp++;
                        }
                        bdp->cbd_bufaddr = iopa(mem_addr);
                        bdp->cbd_sc = (BD_SC_WRAP | BD_SC_INTRPT);

                        if (info->state->smc_scc_num & NUM_IS_SCC) {
                                sup->scc_genscc.scc_tbase = dp_offset;

                                /* Set up the uart parameters in the
                                 * parameter ram.
                                 */
                                sup->scc_genscc.scc_rfcr = SMC_EB;
                                sup->scc_genscc.scc_tfcr = SMC_EB;

                                /* Set this to 1 for now, so we get single
                                 * character interrupts.  Using idle charater
                                 * time requires some additional tuning.
                                 */
                                sup->scc_genscc.scc_mrblr = 1;
                                sup->scc_maxidl = 0;
                                sup->scc_brkcr = 1;
                                sup->scc_parec = 0;
                                sup->scc_frmec = 0;
                                sup->scc_nosec = 0;
                                sup->scc_brkec = 0;
                                sup->scc_uaddr1 = 0;
                                sup->scc_uaddr2 = 0;
                                sup->scc_toseq = 0;
                                sup->scc_char1 = 0x8000;
                                sup->scc_char2 = 0x8000;
                                sup->scc_char3 = 0x8000;
                                sup->scc_char4 = 0x8000;
                                sup->scc_char5 = 0x8000;
                                sup->scc_char6 = 0x8000;
                                sup->scc_char7 = 0x8000;
                                sup->scc_char8 = 0x8000;
                                sup->scc_rccm = 0xc0ff;

                                /* Send the CPM an initialize command.
                                */
                                chan = scc_chan_map[idx];

                                cp->cp_cpcr = mk_cr_cmd(chan,
                                                CPM_CR_INIT_TRX) | CPM_CR_FLG;
                                while (cp->cp_cpcr & CPM_CR_FLG);

                                /* Set UART mode, 8 bit, no parity, one stop.
                                 * Enable receive and transmit.
                                 */
                                scp->scc_gsmrh = 0;
                                scp->scc_gsmrl =
                                        (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);

                                /* Disable all interrupts and clear all pending
                                 * events.
                                 */
                                scp->scc_sccm = 0;
                                scp->scc_scce = 0xffff;
                                scp->scc_dsr = 0x7e7e;
                                scp->scc_pmsr = 0x3000;

                                /* If the port is the console, enable Rx and Tx.
                                */
#ifdef CONFIG_SERIAL_CONSOLE
                                if (i == CONFIG_SERIAL_CONSOLE_PORT)
                                        scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#endif
                        }
                        else {
                                /* Configure SMCs Tx/Rx instead of port B
                                 * parallel I/O.  On 823/850 these are on
                                 * port A for SMC2.
                                 */
#ifndef CONFIG_ALTSMC2
                                iobits = 0xc0 << (idx * 4);
                                cp->cp_pbpar |= iobits;
                                cp->cp_pbdir &= ~iobits;
                                cp->cp_pbodr &= ~iobits;
#else
                                iobits = 0xc0;
                                if (idx == 0) {
                                        /* SMC1 on Port B, like all 8xx.
                                        */
                                        cp->cp_pbpar |= iobits;
                                        cp->cp_pbdir &= ~iobits;
                                        cp->cp_pbodr &= ~iobits;
                                }
                                else {
                                        /* SMC2 is on Port A.
                                        */
                                        immap->im_ioport.iop_papar |= iobits;
                                        immap->im_ioport.iop_padir &= ~iobits;
                                        immap->im_ioport.iop_paodr &= ~iobits;
                                }
#endif /* CONFIG_ALTSMC2 */

                                /* Connect the baud rate generator to the
                                 * SMC based upon index in rs_table.  Also
                                 * make sure it is connected to NMSI.
                                 */
                                cp->cp_simode &= ~(0xffff << (idx * 16));
                                cp->cp_simode |= (i << ((idx * 16) + 12));

                                up->smc_tbase = dp_offset;

                                /* Set up the uart parameters in the
                                 * parameter ram.
                                 */
                                up->smc_rfcr = SMC_EB;
                                up->smc_tfcr = SMC_EB;

                                /* Set this to 1 for now, so we get single
                                 * character interrupts.  Using idle charater
                                 * time requires some additional tuning.
                                 */
                                up->smc_mrblr = 1;
                                up->smc_maxidl = 0;
                                up->smc_brkcr = 1;

                                /* Send the CPM an initialize command.
                                */
                                chan = smc_chan_map[idx];

                                cp->cp_cpcr = mk_cr_cmd(chan,
                                                CPM_CR_INIT_TRX) | CPM_CR_FLG;
                                while (cp->cp_cpcr & CPM_CR_FLG);

                                /* Set UART mode, 8 bit, no parity, one stop.
                                 * Enable receive and transmit.
                                 */
                                sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;

                                /* Disable all interrupts and clear all pending
                                 * events.
                                 */
                                sp->smc_smcm = 0;
                                sp->smc_smce = 0xff;

                                /* If the port is the console, enable Rx and Tx.
                                */
#ifdef CONFIG_SERIAL_CONSOLE
                                if (i == CONFIG_SERIAL_CONSOLE_PORT)
                                        sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
#endif
                        }

                        /* Install interrupt handler.
                        */
                        cpm_install_handler(state->irq, rs_8xx_interrupt, info);

                        /* Set up the baud rate generator.
                        */
                        m8xx_cpm_setbrg(i, baud_table[baud_idx]);

                }
        }

        return 0;
}
module_init(rs_8xx_init);

/* This must always be called before the rs_8xx_init() function, otherwise
 * it blows away the port control information.
*/
static int __init serial_console_setup(struct console *co, char *options)
{
        struct          serial_state *ser;
        uint            mem_addr, bidx, idx, dp_offset;
        ushort          chan;
        volatile        cbd_t           *bdp;
        volatile        cpm8xx_t        *cp;
        volatile        smc_t           *sp;
        volatile        scc_t           *scp;
        volatile        smc_uart_t      *up;
        volatile        scc_uart_t      *sup;
        bd_t                            *bd;

        bd = (bd_t *)__res;

        for (bidx = 0; bidx < (sizeof(baud_table) / sizeof(int)); bidx++)
                if (bd->bi_baudrate == baud_table[bidx])
                        break;
        /* make sure we have a useful value */
        if (bidx == (sizeof(baud_table) / sizeof(int)))
                bidx = 13;      /* B9600 */

        co->cflag = CREAD|CLOCAL|bidx|CS8;
        baud_idx = bidx;

        ser = rs_table + co->index;

        cp = cpmp;      /* Get pointer to Communication Processor */

        idx = PORT_NUM(ser->smc_scc_num);
        if (ser->smc_scc_num & NUM_IS_SCC) {
                scp = &cp->cp_scc[idx];
                sup = (scc_uart_t *)&cp->cp_dparam[ser->port];
        }
        else {
                sp = &cp->cp_smc[idx];
                up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];
        }

        /* When we get here, the CPM has been reset, so we need
         * to configure the port.
         * We need to allocate a transmit and receive buffer descriptor
         * from dual port ram, and a character buffer area from host mem.
         */

        /* Allocate space for two FIFOs.  We can't allocate from host
         * memory yet because vm allocator isn't initialized
         * during this early console init.
         */
        dp_offset = cpm_dpalloc(8, 8);
        mem_addr = (uint)(&cpmp->cp_dpmem[dp_offset]);

        /* Allocate space for two buffer descriptors in the DP ram.
        */
        dp_offset = cpm_dpalloc(sizeof(cbd_t) * 2, 8);

        /* Set the physical address of the host memory buffers in
         * the buffer descriptors.
         */
        bdp = (cbd_t *)&cp->cp_dpmem[dp_offset];
        bdp->cbd_bufaddr = iopa(mem_addr);
        (bdp+1)->cbd_bufaddr = iopa(mem_addr+4);

        consinfo.rx_va_base = mem_addr;
        consinfo.rx_bd_base = bdp;
        consinfo.tx_va_base = mem_addr + 4;
        consinfo.tx_bd_base = bdp+1;

        /* For the receive, set empty and wrap.
         * For transmit, set wrap.
         */
        bdp->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
        (bdp+1)->cbd_sc = BD_SC_WRAP;

        /* Set up the uart parameters in the parameter ram.
        */
        if (ser->smc_scc_num & NUM_IS_SCC) {

                sup->scc_genscc.scc_rbase = dp_offset;
                sup->scc_genscc.scc_tbase = dp_offset + sizeof(cbd_t);

                /* Set up the uart parameters in the
                 * parameter ram.
                 */
                sup->scc_genscc.scc_rfcr = SMC_EB;
                sup->scc_genscc.scc_tfcr = SMC_EB;

                /* Set this to 1 for now, so we get single
                 * character interrupts.  Using idle charater
                 * time requires some additional tuning.
                 */
                sup->scc_genscc.scc_mrblr = 1;
                sup->scc_maxidl = 0;
                sup->scc_brkcr = 1;
                sup->scc_parec = 0;
                sup->scc_frmec = 0;
                sup->scc_nosec = 0;
                sup->scc_brkec = 0;
                sup->scc_uaddr1 = 0;
                sup->scc_uaddr2 = 0;
                sup->scc_toseq = 0;
                sup->scc_char1 = 0x8000;
                sup->scc_char2 = 0x8000;
                sup->scc_char3 = 0x8000;
                sup->scc_char4 = 0x8000;
                sup->scc_char5 = 0x8000;
                sup->scc_char6 = 0x8000;
                sup->scc_char7 = 0x8000;
                sup->scc_char8 = 0x8000;
                sup->scc_rccm = 0xc0ff;

                /* Send the CPM an initialize command.
                */
                chan = scc_chan_map[idx];

                cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
                while (cp->cp_cpcr & CPM_CR_FLG);

                /* Set UART mode, 8 bit, no parity, one stop.
                 * Enable receive and transmit.
                 */
                scp->scc_gsmrh = 0;
                scp->scc_gsmrl =
                        (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);

                /* Disable all interrupts and clear all pending
                 * events.
                 */
                scp->scc_sccm = 0;
                scp->scc_scce = 0xffff;
                scp->scc_dsr = 0x7e7e;
                scp->scc_pmsr = 0x3000;

                scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);

        }
        else {
                up->smc_rbase = dp_offset;      /* Base of receive buffer desc. */
                up->smc_tbase = dp_offset+sizeof(cbd_t);        /* Base of xmt buffer desc. */
                up->smc_rfcr = SMC_EB;
                up->smc_tfcr = SMC_EB;

                /* Set this to 1 for now, so we get single character interrupts.
                */
                up->smc_mrblr = 1;              /* receive buffer length */
                up->smc_maxidl = 0;             /* wait forever for next char */

                /* Send the CPM an initialize command.
                */
                chan = smc_chan_map[idx];
                cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
                printk("%s", "");
                while (cp->cp_cpcr & CPM_CR_FLG);

                /* Set UART mode, 8 bit, no parity, one stop.
                 * Enable receive and transmit.
                 */
                sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;

                /* And finally, enable Rx and Tx.
                */
                sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
        }

        /* Set up the baud rate generator.
        */
        m8xx_cpm_setbrg((ser - rs_table), bd->bi_baudrate);

        return 0;
}