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68360serial.c

/*
 *  UART driver for 68360 CPM SCC or SMC
 *  Copyright (c) 2000 D. Jeff Dionne <jeff@uclinux.org>,
 *  Copyright (c) 2000 Michael Leslie <mleslie@lineo.ca>
 *  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.
 *
 * This module exports the following rs232 io functions:
 *
 *    int rs_360_init(void);
 */

#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/init.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <asm/m68360.h>
#include <asm/commproc.h>

 
#ifdef CONFIG_KGDB
extern void breakpoint(void);
extern void set_debug_traps(void);
extern int  kgdb_output_string (const char* s, unsigned int count);
#endif


/* #ifdef CONFIG_SERIAL_CONSOLE */ /* This seems to be a post 2.0 thing - mles */
#include <linux/console.h>

/* this defines the index into rs_table for the port to use
 */
#ifndef CONFIG_SERIAL_CONSOLE_PORT
#define CONFIG_SERIAL_CONSOLE_PORT  1 /* ie SMC2 - note USE_SMC2 must be defined */
#endif
/* #endif */

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

/*
 * 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)


#if defined (CONFIG_UCQUICC)

volatile extern void *_periph_base;
/* sipex transceiver
 *   mode bits for       are on pins
 *
 *    SCC2                d16..19
 *    SCC3                d20..23
 *    SCC4                d24..27
 */
#define SIPEX_MODE(n,m) ((m & 0x0f)<<(16+4*(n-1)))

static uint sipex_mode_bits = 0x00000000;

#endif

/* There is no `serial_state' defined back here in 2.0.
 * Try to get by with serial_struct
 */
/* #define serial_state serial_struct */

/* 2.4 -> 2.0 portability problem: async_icount in 2.4 has a few
 * extras: */

#if 0
struct async_icount_24 {
      __u32   cts, dsr, rng, dcd, tx, rx;
      __u32   frame, parity, overrun, brk;
      __u32   buf_overrun;
} icount;
#endif

#if 0

struct serial_state {
        int     magic;
        int     baud_base;
        unsigned long   port;
        int     irq;
        int     flags;
        int     hub6;
        int     type;
        int     line;
        int     revision;       /* Chip revision (950) */
        int     xmit_fifo_size;
        int     custom_divisor;
        int     count;
        u8      *iomem_base;
        u16     iomem_reg_shift;
        unsigned short  close_delay;
        unsigned short  closing_wait; /* time to wait before closing */
        struct async_icount_24     icount; 
        int     io_type;
        struct async_struct *info;
};
#endif

#define SSTATE_MAGIC 0x5302



/* SMC2 is sometimes used for low performance TDM interfaces.  Define
 * this as 1 if you want SMC2 as a serial port UART managed by this driver.
 * Define this as 0 if you wish to use SMC2 for something else.
 */
#define USE_SMC2 1

#if 0
/* Define SCC to ttySx mapping. */
#define SCC_NUM_BASE    (USE_SMC2 + 1)    /* SCC base tty "number" */

/* Define which SCC is the first one to use for a serial port.  These
 * are 0-based numbers, i.e. this assumes the first SCC (SCC1) is used
 * for Ethernet, and the first available SCC for serial UART is SCC2.
 * NOTE:  IF YOU CHANGE THIS, you have to change the PROFF_xxx and
 * interrupt vectors in the table below to match.
 */
#define SCC_IDX_BASE    1     /* table index */
#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[] = {
/*  type   line   PORT           IRQ       FLAGS  smc_scc_num (F.K.A. hub6) */
      {  0,     0, PRSLOT_SMC1, CPMVEC_SMC1,   0,    0 }    /* SMC1 ttyS0 */
#if USE_SMC2
      ,{ 0,     0, PRSLOT_SMC2, CPMVEC_SMC2,   0,    1 }     /* SMC2 ttyS1 */
#endif

#if defined(CONFIG_SERIAL_68360_SCC)
      ,{ 0,     0, PRSLOT_SCC2, CPMVEC_SCC2,   0, (NUM_IS_SCC | 1) }    /* SCC2 ttyS2 */
      ,{ 0,     0, PRSLOT_SCC3, CPMVEC_SCC3,   0, (NUM_IS_SCC | 2) }    /* SCC3 ttyS3 */
      ,{ 0,     0, PRSLOT_SCC4, CPMVEC_SCC4,   0, (NUM_IS_SCC | 3) }    /* SCC4 ttyS4 */
#endif
};

#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

#define CONSOLE_NUM_FIFO 2
#define CONSOLE_BUF_SIZE 4

char *console_fifos[CONSOLE_NUM_FIFO * CONSOLE_BUF_SIZE];

/* 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 serial_struct *state; */
      /* struct async_struct  *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 work_struct      tqueue;
      struct work_struct      tqueue_hangup;
      wait_queue_head_t open_wait; 
      wait_queue_head_t close_wait; 

      
/* CPM Buffer Descriptor pointers.
      */
      QUICC_BD                *rx_bd_base;
      QUICC_BD                *rx_cur;
      QUICC_BD                *tx_bd_base;
      QUICC_BD                *tx_cur;
} ser_info_t;


/* since kmalloc_init() does not get called until much after this initialization: */
static ser_info_t  quicc_ser_info[NR_PORTS];
static char rx_buf_pool[NR_PORTS * RX_NUM_FIFO * RX_BUF_SIZE];
static char tx_buf_pool[NR_PORTS * TX_NUM_FIFO * TX_BUF_SIZE];

static void change_speed(ser_info_t *info);
static void rs_360_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 };

/* This sucks. There is a better way: */
#if defined(CONFIG_CONSOLE_9600)
  #define CONSOLE_BAUDRATE 9600
#elif defined(CONFIG_CONSOLE_19200)
  #define CONSOLE_BAUDRATE 19200
#elif defined(CONFIG_CONSOLE_115200)
  #define CONSOLE_BAUDRATE 115200
#else
  #warning "console baud rate undefined"
  #define CONSOLE_BAUDRATE 9600
#endif

/*
 * ------------------------------------------------------------
 * 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_360_stop(struct tty_struct *tty)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      int   idx;
      unsigned long flags;
      volatile struct scc_regs *sccp;
      volatile struct smc_regs *smcp;

      if (serial_paranoia_check(info, tty->name, "rs_stop"))
            return;
      
      local_irq_save(flags);
      idx = PORT_NUM(info->state->smc_scc_num);
      if (info->state->smc_scc_num & NUM_IS_SCC) {
            sccp = &pquicc->scc_regs[idx];
            sccp->scc_sccm &= ~UART_SCCM_TX;
      } else {
            /* smcp = &cpmp->cp_smc[idx]; */
            smcp = &pquicc->smc_regs[idx];
            smcp->smc_smcm &= ~SMCM_TX;
      }
      local_irq_restore(flags);
}


static void rs_360_start(struct tty_struct *tty)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      int   idx;
      unsigned long flags;
      volatile struct scc_regs *sccp;
      volatile struct smc_regs *smcp;

      if (serial_paranoia_check(info, tty->name, "rs_stop"))
            return;
      
      local_irq_save(flags);
      idx = PORT_NUM(info->state->smc_scc_num);
      if (info->state->smc_scc_num & NUM_IS_SCC) {
            sccp = &pquicc->scc_regs[idx];
            sccp->scc_sccm |= UART_SCCM_TX;
      } else {
            smcp = &pquicc->smc_regs[idx];
            smcp->smc_smcm |= SMCM_TX;
      }
      local_irq_restore(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
 * -----------------------------------------------------------------------
 */

static _INLINE_ void receive_chars(ser_info_t *info)
{
      struct tty_struct *tty = info->tty;
      unsigned char ch, flag, *cp;
      /*int ignored = 0;*/
      int   i;
      ushort      status;
       struct     async_icount *icount; 
      /* struct   async_icount_24 *icount; */
      volatile QUICC_BD *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->status & 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->status |= BD_SC_EMPTY;
                  bdp->status &=
                        ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);

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

            /* Get the number of characters and the buffer pointer.
            */
            i = bdp->length;
            /* cp = (unsigned char *)__va(bdp->buf); */
            cp = (char *)bdp->buf;
            status = bdp->status;

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

#ifdef SERIAL_DEBUG_INTR
                  printk("DR%02x:%02x...", ch, status);
#endif
                  flag = TTY_NORMAL;

                  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)
                              flag = TTY_PARITY;
                        else if (status & BD_SC_FR)
                              flag = TTY_FRAME;
                  }
                  tty_insert_flip_char(tty, ch, flag);
                  if (status & BD_SC_OV)
                        /*
                         * Overrun is special, since it's
                         * reported immediately, and doesn't
                         * affect the current character
                         */
                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
            }

            /* This BD is ready to be used again.  Clear status.
             * Get next BD.
             */
            bdp->status |= BD_SC_EMPTY;
            bdp->status &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);

            if (bdp->status & BD_SC_WRAP)
                  bdp = info->rx_bd_base;
            else
                  bdp++;
      }

      info->rx_cur = (QUICC_BD *)bdp;

      tty_schedule_flip(tty);
}

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

      info->state->icount.brk++;
      /* Check to see if there is room in the tty buffer for
       * the break.  If not, we exit now, losing the break.  FIXME
       */
      tty_insert_flip_char(tty, 0, TTY_BREAK);
      tty_schedule_flip(tty);
}

static _INLINE_ void transmit_chars(ser_info_t *info)
{

      if ((info->flags & TX_WAKEUP) ||
          (info->tty->flags & (1 << TTY_DO_WRITE_WAKEUP))) {
            schedule_work(&info->tqueue);
      }

#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; */
      struct      async_icount_24 *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
                  queue_task(&info->tqueue_hangup,
                                 &tq_scheduler);
            }
      }
      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_360_interrupt(void *dev_id) */ /* until and if we start servicing irqs here */
static void rs_360_interrupt(int vec, void *dev_id)
{
      u_char      events;
      int   idx;
      ser_info_t *info;
      volatile struct smc_regs *smcp;
      volatile struct scc_regs *sccp;
      
      info = dev_id;

      idx = PORT_NUM(info->state->smc_scc_num);
      if (info->state->smc_scc_num & NUM_IS_SCC) {
            sccp = &pquicc->scc_regs[idx];
            events = sccp->scc_scce;
            if (events & SCCM_RX)
                  receive_chars(info);
            if (events & SCCM_TX)
                  transmit_chars(info);
            sccp->scc_scce = events;
      } else {
            smcp = &pquicc->smc_regs[idx];
            events = smcp->smc_smce;
            if (events & SMCM_BRKE)
                  receive_break(info);
            if (events & SMCM_RX)
                  receive_chars(info);
            if (events & SMCM_TX)
                  transmit_chars(info);
            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.
 * -------------------------------------------------------------------
 */


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))
            tty_wakeup(tty);
}


/*
 * 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)
            return;

      tty_hangup(tty);
}


static int startup(ser_info_t *info)
{
      unsigned long flags;
      int   retval=0;
      int   idx;
      /*struct serial_state *state = info->state;*/
      volatile struct smc_regs *smcp;
      volatile struct scc_regs *sccp;
      volatile struct smc_uart_pram *up;
      volatile struct uart_pram         *scup;


      local_irq_save(flags);

      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 = &pquicc->scc_regs[idx];
            scup = &pquicc->pram[info->state->port].scc.pscc.u;

            scup->mrblr = RX_BUF_SIZE;
            scup->max_idl = RX_BUF_SIZE;

            sccp->scc_sccm |= (UART_SCCM_TX | UART_SCCM_RX);
            sccp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);

      } else {
            smcp = &pquicc->smc_regs[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 *)&pquicc->cp_dparam[state->port]; */
            /* holy unionized structures, Batman: */
            up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;

            up->mrblr = RX_BUF_SIZE;
            up->max_idl = RX_BUF_SIZE;

            up->brkcr = 1;    /* number of break chars */
      }

      info->flags |= ASYNC_INITIALIZED;
      local_irq_restore(flags);
      return 0;
      
errout:
      local_irq_restore(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 struct smc_regs      *smcp;
      volatile struct scc_regs      *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
      
      local_irq_save(flags);

      idx = PORT_NUM(state->smc_scc_num);
      if (state->smc_scc_num & NUM_IS_SCC) {
            sccp = &pquicc->scc_regs[idx];
            sccp->scc_gsmr.w.low &= ~(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 = &pquicc->smc_regs[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;
      local_irq_restore(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;
      int   i, bits, sbits, idx;
      unsigned long     flags;
      struct serial_state *state;
      volatile struct smc_regs      *smcp;
      volatile struct scc_regs      *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
       */
      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;
       local_irq_save(flags);

       /* 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 = &pquicc->scc_regs[idx];
         sccp->scc_psmr = (sbits << 12) | scval;
     } else {
         smcp = &pquicc->smc_regs[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;
            smcp->smc_smcmr = smcr_mk_clen(bits) | cval |  SMCMR_SM_UART;
            smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
      }

      m360_cpm_setbrg((state - rs_table), baud_rate);

      local_irq_restore(flags);
}

static void rs_360_put_char(struct tty_struct *tty, unsigned char ch)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      volatile QUICC_BD *bdp;

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

      if (!tty)
            return;

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

      /* *((char *)__va(bdp->buf)) = ch; */
      *((char *)bdp->buf) = ch;
      bdp->length = 1;
      bdp->status |= BD_SC_READY;

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

      info->tx_cur = (QUICC_BD *)bdp;

}

static int rs_360_write(struct tty_struct * tty,
                const unsigned char *buf, int count)
{
      int   c, ret = 0;
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      volatile QUICC_BD *bdp;

#ifdef CONFIG_KGDB
      /* 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->status & BD_SC_READY) {
                  info->flags |= TX_WAKEUP;
                  break;
            }

            /* memcpy(__va(bdp->buf), buf, c); */
            memcpy((void *)bdp->buf, buf, c);

            bdp->length = c;
            bdp->status |= BD_SC_READY;

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

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

static int rs_360_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->status & 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_360_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_360_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.
       */
      tty_wakeup(tty);
      info->flags &= ~TX_WAKEUP;
}

/*
 * This function is used to send a high-priority XON/XOFF character to
 * the device
 */
static void rs_360_send_xchar(struct tty_struct *tty, char ch)
{
      volatile QUICC_BD *bdp;

      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->status & BD_SC_READY);

      /* *((char *)__va(bdp->buf)) = ch; */
      *((char *)bdp->buf) = ch;
      bdp->length = 1;
      bdp->status |= BD_SC_READY;

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

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

/*
 * ------------------------------------------------------------
 * rs_throttle()
 * 
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 * ------------------------------------------------------------
 */
static void rs_360_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_360_send_xchar(tty, STOP_CHAR(tty));

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

      local_irq_disable();
      serial_out(info, UART_MCR, info->MCR);
      local_irq_enable();
#endif
}

static void rs_360_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_360_send_xchar(tty, START_CHAR(tty));
      }
#ifdef modem_control
      if (tty->termios->c_cflag & CRTSCTS)
            info->MCR |= UART_MCR_RTS;
      local_irq_disable();
      serial_out(info, UART_MCR, info->MCR);
      local_irq_enable();
#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;

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

static int rs_360_tiocmget(struct tty_struct *tty, struct file *file)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      unsigned int result = 0;
#ifdef modem_control
      unsigned char control, status;

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

      if (tty->flags & (1 << TTY_IO_ERROR))
            return -EIO;

      control = info->MCR;
      local_irq_disable();
      status = serial_in(info, UART_MSR);
      local_irq_enable();
      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 result;
}

static int rs_360_tiocmset(struct tty_struct *tty, struct file *file,
                     unsigned int set, unsigned int clear)
{
#ifdef modem_control
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      unsigned int arg;

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

      if (tty->flags & (1 << TTY_IO_ERROR))
            return -EIO;

      if (set & TIOCM_RTS)
            info->mcr |= UART_MCR_RTS;
      if (set & TIOCM_DTR)
            info->mcr |= UART_MCR_DTR;
      if (clear & TIOCM_RTS)
            info->MCR &= ~UART_MCR_RTS;
      if (clear & TIOCM_DTR)
            info->MCR &= ~UART_MCR_DTR;

#ifdef TIOCM_OUT1
      if (set & TIOCM_OUT1)
            info->MCR |= UART_MCR_OUT1;
      if (set & TIOCM_OUT2)
            info->MCR |= UART_MCR_OUT2;
      if (clear & TIOCM_OUT1)
            info->MCR &= ~UART_MCR_OUT1;
      if (clear & TIOCM_OUT2)
            info->MCR &= ~UART_MCR_OUT2;
#endif

      local_irq_disable();
      serial_out(info, UART_MCR, info->MCR);
      local_irq_enable();
#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 QUICC *cp;
      ushort      chan;
      int     idx;

      cp = pquicc;

      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_cr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG;
      while (cp->cp_cr & CPM_CR_FLG);
}

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

      cp = pquicc;

      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_cr = mk_cr_cmd(chan, CPM_CR_RESTART_TX) | CPM_CR_FLG;
      while (cp->cp_cr & CPM_CR_FLG);
}

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


static int rs_360_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; 
      /* struct async_icount_24 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, 250);  /* 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*100 : 250);
                  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); */
                  put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg);
                  return 0;
            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;
#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
                  local_irq_disable();
                  /* note the counters on entry */
                  cprev = info->state->icount;
                  local_irq_enable();
                  while (1) {
                        interruptible_sleep_on(&info->delta_msr_wait);
                        /* see if a signal did it */
                        if (signal_pending(current))
                              return -ERESTARTSYS;
                        local_irq_disable();
                        cnow = info->state->icount; /* atomic copy */
                        local_irq_enable();
                        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:
                  local_irq_disable();
                  cnow = info->state->icount;
                  local_irq_enable();
                  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; */

                  put_user(cnow.cts, &p_cuser->cts);
                  put_user(cnow.dsr, &p_cuser->dsr);
                  put_user(cnow.rng, &p_cuser->rng);
                  put_user(cnow.dcd, &p_cuser->dcd);
                  return 0;

            default:
                  return -ENOIOCTLCMD;
            }
      return 0;
}

/* FIX UP modem control here someday......
*/
static void rs_360_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;

      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);
            local_irq_disable();
            serial_out(info, UART_MCR, info->MCR);
            local_irq_enable();
      }
      
      /* 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;
            }
            local_irq_disable();
            serial_out(info, UART_MCR, info->MCR);
            local_irq_enable();
      }
      
      /* Handle turning off CRTSCTS */
      if ((old_termios->c_cflag & CRTSCTS) &&
          !(tty->termios->c_cflag & CRTSCTS)) {
            tty->hw_stopped = 0;
            rs_360_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_360_close(struct tty_struct *tty, struct file * filp)
{
      ser_info_t *info = (ser_info_t *)tty->driver_data;
      /* struct async_state *state; */
      struct serial_state *state;
      unsigned long     flags;
      int         idx;
      volatile struct smc_regs      *smcp;
      volatile struct scc_regs      *sccp;

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

      state = info->state;
      
      local_irq_save(flags);
      
      if (tty_hung_up_p(filp)) {
            DBG_CNT("before DEC-hung");
            local_irq_restore(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");
            local_irq_restore(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 = &pquicc->scc_regs[idx];
                  sccp->scc_sccm &= ~UART_SCCM_RX;
                  sccp->scc_gsmr.w.low &= ~SCC_GSMRL_ENR;
            } else {
                  smcp = &pquicc->smc_regs[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_360_wait_until_sent(tty, info->timeout);
      }
      shutdown(info);
      if (tty->driver->flush_buffer)
            tty->driver->flush_buffer(tty);
      tty_ldisc_flush(tty);         
      tty->closing = 0;
      info->event = 0;
      info->tty = 0;
      if (info->blocked_open) {
            if (info->close_delay) {
                  msleep_interruptible(jiffies_to_msecs(info->close_delay));
            }
            wake_up_interruptible(&info->open_wait);
      }
      info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
      wake_up_interruptible(&info->close_wait);
      local_irq_restore(flags);
}

/*
 * rs_wait_until_sent() --- wait until the transmitter is empty
 */
static void rs_360_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 QUICC_BD *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, (unsigned long)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->counter = 0;    make us low-priority */
            msleep_interruptible(jiffies_to_msecs(char_time));
            if (signal_pending(current))
                  break;
            if (timeout && ((orig_jiffies + timeout) < jiffies))
                  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->status & 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_360_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_360_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
      local_irq_disable();
      if (!tty_hung_up_p(filp)) 
            state->count--;
      local_irq_enable();
      info->blocked_open++;
      while (1) {
            local_irq_disable();
            if (tty->termios->c_cflag & CBAUD)
                  serial_out(info, UART_MCR,
                           serial_inp(info, UART_MCR) |
                           (UART_MCR_DTR | UART_MCR_RTS));
            local_irq_enable();
            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_360_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;
      }
      local_irq_disable();
      status = serial_in(info, UART_MSR);
      control = info ? info->MCR : serial_in(info, UART_MCR);
      local_irq_enable();
      
      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_360_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

/*
 * 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;
      QUICC_BD          *bdp, *bdbase;
      volatile struct smc_uart_pram *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]; */
            up = &pquicc->pram[ser->port].scc.pothers.idma_smc.psmc.u;

            /* Get the address of the host memory buffer.
             */
            bdp = bdbase = (QUICC_BD *)((uint)pquicc + (uint)up->tbase);
      }

      /*
       * 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->status & BD_SC_READY);

            /* Send the character out.
             */
            cp = bdp->buf;
            *cp = *s;
            
            bdp->length = 1;
            bdp->status |= BD_SC_READY;

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

            /* if a LF, also do CR... */
            if (*s == 10) {
                  while (bdp->status & BD_SC_READY);
                  /* cp = __va(bdp->buf); */
                  cp = bdp->buf;
                  *cp = 13;
                  bdp->length = 1;
                  bdp->status |= BD_SC_READY;

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

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

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

static void serial_console_write(struct console *c, const char *s,
                        unsigned count)
{
#ifdef CONFIG_KGDB
      /* 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);
}



/*void console_print_68360(const char *p)
{
      const char *cp = p;
      int i;

      for (i=0;cp[i]!=0;i++);

      serial_console_write (p, i);

      //Comment this if you want to have a strict interrupt-driven output
      //rs_fair_output();

      return;
}*/






#ifdef CONFIG_XMON
int
xmon_360_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;
      QUICC_BD          *bdp;
      volatile struct smc_uart_pram *up;
      int                     i;

      ser = rs_table + idx;

      /* 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 = (QUICC_BD *)&cpmp->cp_dpmem[up->smc_rbase]; */
            bdp = (QUICC_BD *)((uint)pquicc + (uint)up->tbase);

      /* Pointer to UART in parameter ram.
       */
      /* up = (smc_uart_t *)&cpmp->cp_dparam[ser->port]; */
      up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;

      /*
       * 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->status & BD_SC_EMPTY);
      }
      else {
            if (bdp->status & BD_SC_EMPTY)
                  return -1;
      }

      cp = (char *)bdp->buf;

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

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

      return((int)c);
}

static int serial_console_wait_key(struct console *co)
{
      return(my_console_wait_key(co->index, 0, NULL));
}

#ifdef CONFIG_XMON
int
xmon_360_read_poll(void)
{
      return(my_console_wait_key(0, 1, NULL));
}

int
xmon_360_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;

unsigned 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 state)
{
}
void kgdb_map_scc(void)
{
      struct            serial_state *ser;
      uint        mem_addr;
      volatile    QUICC_BD          *bdp;
      volatile    smc_uart_t  *up;

      cpmp = (cpm360_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[0x1000]);

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

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

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

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


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



/*
 *    Register console.
 */
long console_360_init(long kmem_start, long kmem_end)
{
      register_console(&sercons);
      /*register_console (console_print_68360); - 2.0.38 only required a write
      function pointer. */
      return kmem_start;
}

#endif

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

static const struct tty_operations rs_360_ops = {
      .owner = THIS_MODULE,
      .open = rs_360_open,
      .close = rs_360_close,
      .write = rs_360_write,
      .put_char = rs_360_put_char,
      .write_room = rs_360_write_room,
      .chars_in_buffer = rs_360_chars_in_buffer,
      .flush_buffer = rs_360_flush_buffer,
      .ioctl = rs_360_ioctl,
      .throttle = rs_360_throttle,
      .unthrottle = rs_360_unthrottle,
      /* .send_xchar = rs_360_send_xchar, */
      .set_termios = rs_360_set_termios,
      .stop = rs_360_stop,
      .start = rs_360_start,
      .hangup = rs_360_hangup,
      /* .wait_until_sent = rs_360_wait_until_sent, */
      /* .read_proc = rs_360_read_proc, */
      .tiocmget = rs_360_tiocmget,
      .tiocmset = rs_360_tiocmset,
};

static int __init rs_360_init(void)
{
      struct serial_state * state;
      ser_info_t  *info;
      void       *mem_addr;
      uint        dp_addr, iobits;
      int             i, j, idx;
      ushort            chan;
      QUICC_BD    *bdp;
      volatile    QUICC       *cp;
      volatile    struct smc_regs   *sp;
      volatile    struct smc_uart_pram    *up;
      volatile    struct scc_regs   *scp;
      volatile    struct uart_pram  *sup;
      /* volatile immap_t           *immap; */
      
      serial_driver = alloc_tty_driver(NR_PORTS);
      if (!serial_driver)
            return -1;

      show_serial_version();

      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_360_ops);
      
      if (tty_register_driver(serial_driver))
            panic("Couldn't register serial driver\n");

      cp = pquicc;      /* 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.
       */
      /* The "standard" configuration through the 860.
      */
/*    immap->im_ioport.iop_papar |= 0x00fc; */
/*    immap->im_ioport.iop_padir &= ~0x00fc; */
/*    immap->im_ioport.iop_paodr &= ~0x00fc; */
      cp->pio_papar |= 0x00fc;
      cp->pio_padir &= ~0x00fc;
      /* cp->pio_paodr &= ~0x00fc; */


      /* 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.
       */
      /* FIXME: see 360um p.7-365 and 860um p.34-12 
       * I can't make sense of these bits - mleslie*/
/*    immap->im_ioport.iop_pcdir |= 0x03c6; */
/*    immap->im_ioport.iop_pcpar &= ~0x03c6; */

/*    cp->pio_pcdir |= 0x03c6; */
/*    cp->pio_pcpar &= ~0x03c6; */



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

      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 irq 0x%02x is an %s\n",
                   i, (unsigned int)(state->irq),
                   (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(8);


/*          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_cr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG; */
/*          while (cp->cp_cr & CPM_CR_FLG); */

#endif
            /* info = kmalloc(sizeof(ser_info_t), GFP_KERNEL); */
            info = &quicc_ser_info[i];
            if (info) {
                  memset (info, 0, sizeof(ser_info_t));
                  info->magic = SERIAL_MAGIC;
                  info->line = i;
                  info->flags = state->flags;
                  INIT_WORK(&info->tqueue, do_softint, info);
                  INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
                  init_waitqueue_head(&info->open_wait);
                  init_waitqueue_head(&info->close_wait);
                  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_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * RX_NUM_FIFO);

                  /* Allocate space for FIFOs in the host memory.
                   *  (for now this is from a static array of buffers :(
                   */
                  /* mem_addr = m360_cpm_hostalloc(RX_NUM_FIFO * RX_BUF_SIZE); */
                  /* mem_addr = kmalloc (RX_NUM_FIFO * RX_BUF_SIZE, GFP_BUFFER); */
                  mem_addr = &rx_buf_pool[i * RX_NUM_FIFO * RX_BUF_SIZE];

                  /* Set the physical address of the host memory
                   * buffers in the buffer descriptors, and the
                   * virtual address for us to work with.
                   */
                  bdp = (QUICC_BD *)((uint)pquicc + dp_addr);
                  info->rx_cur = info->rx_bd_base = bdp;

                  /* initialize rx buffer descriptors */
                  for (j=0; j<(RX_NUM_FIFO-1); j++) {
                        bdp->buf = &rx_buf_pool[(i * RX_NUM_FIFO + j ) * RX_BUF_SIZE];
                        bdp->status = BD_SC_EMPTY | BD_SC_INTRPT;
                        mem_addr += RX_BUF_SIZE;
                        bdp++;
                  }
                  bdp->buf = &rx_buf_pool[(i * RX_NUM_FIFO + j ) * RX_BUF_SIZE];
                  bdp->status = 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) {

#if defined (CONFIG_UCQUICC) && 1
                        /* set the transceiver mode to RS232 */
                        sipex_mode_bits &= ~(uint)SIPEX_MODE(idx,0x0f); /* clear current mode */
                        sipex_mode_bits |= (uint)SIPEX_MODE(idx,0x02);
                        *(uint *)_periph_base = sipex_mode_bits;
                        /* printk ("sipex bits = 0x%08x\n", sipex_mode_bits); */
#endif
                  }

                  dp_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * TX_NUM_FIFO);

                  /* Allocate space for FIFOs in the host memory.
                  */
                  /* mem_addr = m360_cpm_hostalloc(TX_NUM_FIFO * TX_BUF_SIZE); */
                  /* mem_addr = kmalloc (TX_NUM_FIFO * TX_BUF_SIZE, GFP_BUFFER); */
                  mem_addr = &tx_buf_pool[i * TX_NUM_FIFO * TX_BUF_SIZE];

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

                  /* initialize tx buffer descriptors */
                  for (j=0; j<(TX_NUM_FIFO-1); j++) {
                        bdp->buf = &tx_buf_pool[(i * TX_NUM_FIFO + j ) * TX_BUF_SIZE];
                        bdp->status = BD_SC_INTRPT;
                        mem_addr += TX_BUF_SIZE;
                        bdp++;
                  }
                  bdp->buf = &tx_buf_pool[(i * TX_NUM_FIFO + j ) * TX_BUF_SIZE];
                  bdp->status = (BD_SC_WRAP | BD_SC_INTRPT);

                  if (info->state->smc_scc_num & NUM_IS_SCC) {
                        scp = &pquicc->scc_regs[idx];
                        sup = &pquicc->pram[info->state->port].scc.pscc.u;
                        sup->rbase = dp_addr;
                        sup->tbase = dp_addr;

                        /* Set up the uart parameters in the
                         * parameter ram.
                         */
                        sup->rfcr = SMC_EB;
                        sup->tfcr = SMC_EB;

                        /* Set this to 1 for now, so we get single
                         * character interrupts.  Using idle charater
                         * time requires some additional tuning.
                         */
                        sup->mrblr = 1;
                        sup->max_idl = 0;
                        sup->brkcr = 1;
                        sup->parec = 0;
                        sup->frmer = 0;
                        sup->nosec = 0;
                        sup->brkec = 0;
                        sup->uaddr1 = 0;
                        sup->uaddr2 = 0;
                        sup->toseq = 0;
                        {
                              int i;
                              for (i=0;i<8;i++)
                                    sup->cc[i] = 0x8000;
                        }
                        sup->rccm = 0xc0ff;

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

                        /* execute the INIT RX & TX PARAMS command for this channel. */
                        cp->cp_cr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
                        while (cp->cp_cr & CPM_CR_FLG);

                        /* Set UART mode, 8 bit, no parity, one stop.
                         * Enable receive and transmit.
                         */
                        scp->scc_gsmr.w.high = 0;
                        scp->scc_gsmr.w.low = 
                              (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_psmr = 0x3000;

                        /* If the port is the console, enable Rx and Tx.
                        */
#ifdef CONFIG_SERIAL_CONSOLE
                        if (i == CONFIG_SERIAL_CONSOLE_PORT)
                              scp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#endif
                  }
                  else {
                        /* Configure SMCs Tx/Rx instead of port B
                         * parallel I/O.
                         */
                        up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;
                        up->rbase = dp_addr;

                        iobits = 0xc0 << (idx * 4);
                        cp->pip_pbpar |= iobits;
                        cp->pip_pbdir &= ~iobits;
                        cp->pip_pbodr &= ~iobits;


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

                        up->tbase = dp_addr;

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

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

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

                        cp->cp_cr = mk_cr_cmd(chan,
                                                        CPM_CR_INIT_TRX) | CPM_CR_FLG;
#ifdef CONFIG_SERIAL_CONSOLE
                        if (i == CONFIG_SERIAL_CONSOLE_PORT)
                              printk("");
#endif
                        while (cp->cp_cr & CPM_CR_FLG);

                        /* Set UART mode, 8 bit, no parity, one stop.
                         * Enable receive and transmit.
                         */
                        sp = &cp->smc_regs[idx];
                        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(IRQ_MACHSPEC | state->irq, rs_360_interrupt, info);  */
                  /*request_irq(IRQ_MACHSPEC | state->irq, rs_360_interrupt, */
                  request_irq(state->irq, rs_360_interrupt,
                                    IRQ_FLG_LOCK, "ttyS", (void *)info);

                  /* Set up the baud rate generator.
                  */
                  m360_cpm_setbrg(i, baud_table[baud_idx]);

            }
      }

      return 0;
}
module_init(rs_360_init);

/* This must always be called before the rs_360_init() function, otherwise
 * it blows away the port control information.
 */
//static int __init serial_console_setup( struct console *co, char *options)
int serial_console_setup( struct console *co, char *options)
{
      struct            serial_state      *ser;
      uint        mem_addr, dp_addr, bidx, idx, iobits;
      ushort            chan;
      QUICC_BD    *bdp;
      volatile    QUICC             *cp;
      volatile    struct smc_regs   *sp;
      volatile    struct scc_regs   *scp;
      volatile    struct smc_uart_pram    *up;
      volatile    struct uart_pram        *sup;

/* mleslie TODO:
 * add something to the 68k bootloader to store a desired initial console baud rate */

/*    bd_t                                *bd; */ /* a board info struct used by EPPC-bug */
/*    bd = (bd_t *)__res; */

      for (bidx = 0; bidx < (sizeof(baud_table) / sizeof(int)); bidx++)
       /* if (bd->bi_baudrate == baud_table[bidx]) */
            if (CONSOLE_BAUDRATE == baud_table[bidx])
                  break;

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

      ser = rs_table + CONFIG_SERIAL_CONSOLE_PORT;

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

      idx = PORT_NUM(ser->smc_scc_num);
      if (ser->smc_scc_num & NUM_IS_SCC) {

            /* TODO: need to set up SCC pin assignment etc. here */
            
      }
      else {
            iobits = 0xc0 << (idx * 4);
            cp->pip_pbpar |= iobits;
            cp->pip_pbdir &= ~iobits;
            cp->pip_pbodr &= ~iobits;

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

      /* 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 buffer descriptors in the DP ram.
      */
      dp_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * CONSOLE_NUM_FIFO);

      /* Allocate space for two 2 byte FIFOs in the host memory.
       */
      /* mem_addr = m360_cpm_hostalloc(8); */
      mem_addr = (uint)console_fifos;


      /* Set the physical address of the host memory buffers in
       * the buffer descriptors.
       */
      /* bdp = (QUICC_BD *)&cp->cp_dpmem[dp_addr]; */
      bdp = (QUICC_BD *)((uint)pquicc + dp_addr);
      bdp->buf = (char *)mem_addr;
      (bdp+1)->buf = (char *)(mem_addr+4);

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

      /* Set up the uart parameters in the parameter ram.
       */
      if (ser->smc_scc_num & NUM_IS_SCC) {
            scp = &cp->scc_regs[idx];
            /* sup = (scc_uart_t *)&cp->cp_dparam[ser->port]; */
            sup = &pquicc->pram[ser->port].scc.pscc.u;

            sup->rbase = dp_addr;
            sup->tbase = dp_addr + sizeof(QUICC_BD);

            /* Set up the uart parameters in the
             * parameter ram.
             */
            sup->rfcr = SMC_EB;
            sup->tfcr = SMC_EB;

            /* Set this to 1 for now, so we get single
             * character interrupts.  Using idle charater
             * time requires some additional tuning.
             */
            sup->mrblr = 1;
            sup->max_idl = 0;
            sup->brkcr = 1;
            sup->parec = 0;
            sup->frmer = 0;
            sup->nosec = 0;
            sup->brkec = 0;
            sup->uaddr1 = 0;
            sup->uaddr2 = 0;
            sup->toseq = 0;
            {
                  int i;
                  for (i=0;i<8;i++)
                        sup->cc[i] = 0x8000;
            }
            sup->rccm = 0xc0ff;

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

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

            /* Set UART mode, 8 bit, no parity, one stop.
             * Enable receive and transmit.
             */
            scp->scc_gsmr.w.high = 0;
            scp->scc_gsmr.w.low = 
                  (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_psmr = 0x3000;

            scp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);

      }
      else {
            /* up = (smc_uart_t *)&cp->cp_dparam[ser->port]; */
            up = &pquicc->pram[ser->port].scc.pothers.idma_smc.psmc.u;

            up->rbase = dp_addr;    /* Base of receive buffer desc. */
            up->tbase = dp_addr+sizeof(QUICC_BD);     /* Base of xmt buffer desc. */
            up->rfcr = SMC_EB;
            up->tfcr = SMC_EB;

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

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

            /* Set UART mode, 8 bit, no parity, one stop.
             * Enable receive and transmit.
             */
            sp = &cp->smc_regs[idx];
            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.
      */
      /* m360_cpm_setbrg((ser - rs_table), bd->bi_baudrate); */
      m360_cpm_setbrg((ser - rs_table), CONSOLE_BAUDRATE);

      return 0;
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 * End:
 */

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