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aurora.c

/*    $Id: aurora.c,v 1.19 2002/01/08 16:00:16 davem Exp $
 *    linux/drivers/sbus/char/aurora.c -- Aurora multiport driver
 *
 *    Copyright (c) 1999 by Oliver Aldulea (oli at bv dot ro)
 *
 *    This code is based on the RISCom/8 multiport serial driver written
 *    by Dmitry Gorodchanin (pgmdsg@ibi.com), based on the Linux serial
 *    driver, written by Linus Torvalds, Theodore T'so and others.
 *    The Aurora multiport programming info was obtained mainly from the
 *    Cirrus Logic CD180 documentation (available on the web), and by
 *    doing heavy tests on the board. Many thanks to Eddie C. Dost for the
 *    help on the sbus interface.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Revision 1.0
 *
 *    This is the first public release.
 *
 *    Most of the information you need is in the aurora.h file. Please
 *    read that file before reading this one.
 *
 *    Several parts of the code do not have comments yet.
 * 
 * n.b.  The board can support 115.2 bit rates, but only on a few
 * ports. The total badwidth of one chip (ports 0-7 or 8-15) is equal
 * to OSC_FREQ div 16. In case of my board, each chip can take 6
 * channels of 115.2 kbaud.  This information is not well-tested.
 * 
 * Fixed to use tty_get_baud_rate().
 *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
 */

#include <linux/module.h>

#include <linux/errno.h>
#include <linux/sched.h>
#ifdef AURORA_INT_DEBUG
#include <linux/timer.h>
#endif
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/kdebug.h>
#include <asm/sbus.h>
#include <asm/uaccess.h>

#include "aurora.h"
#include "cd180.h"

unsigned char irqs[4] = {
      0, 0, 0, 0
};

#ifdef AURORA_INT_DEBUG
int irqhit=0;
#endif

static struct tty_driver *aurora_driver;
static struct Aurora_board aurora_board[AURORA_NBOARD] = {
      {0,},
};

static struct Aurora_port aurora_port[AURORA_TNPORTS] =  {
      { 0, },
};

/* no longer used. static struct Aurora_board * IRQ_to_board[16] = { NULL, } ;*/
static unsigned char * tmp_buf = NULL;

DECLARE_TASK_QUEUE(tq_aurora);

static inline int aurora_paranoia_check(struct Aurora_port const * port,
                            char *name, const char *routine)
{
#ifdef AURORA_PARANOIA_CHECK
      static const char *badmagic =
            KERN_DEBUG "aurora: Warning: bad aurora port magic number for device %s in %s\n";
      static const char *badinfo =
            KERN_DEBUG "aurora: Warning: null aurora port for device %s in %s\n";

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

/*
 * 
 *  Service functions for aurora driver.
 * 
 */

/* Get board number from pointer */
static inline int board_No (struct Aurora_board const * bp)
{
      return bp - aurora_board;
}

/* Get port number from pointer */
static inline int port_No (struct Aurora_port const * port)
{
      return AURORA_PORT(port - aurora_port); 
}

/* Get pointer to board from pointer to port */
static inline struct Aurora_board * port_Board(struct Aurora_port const * port)
{
      return &aurora_board[AURORA_BOARD(port - aurora_port)];
}

/* Wait for Channel Command Register ready */
static inline void aurora_wait_CCR(struct aurora_reg128 * r)
{
      unsigned long delay;

#ifdef AURORA_DEBUG
printk("aurora_wait_CCR\n");
#endif
      /* FIXME: need something more descriptive than 100000 :) */
      for (delay = 100000; delay; delay--) 
            if (!sbus_readb(&r->r[CD180_CCR]))
                  return;
      printk(KERN_DEBUG "aurora: Timeout waiting for CCR.\n");
}

/*
 *  aurora probe functions.
 */

/* Must be called with enabled interrupts */
static inline void aurora_long_delay(unsigned long delay)
{
      unsigned long i;

#ifdef AURORA_DEBUG
      printk("aurora_long_delay: start\n");
#endif
      for (i = jiffies + delay; time_before(jiffies, i); ) ;
#ifdef AURORA_DEBUG
      printk("aurora_long_delay: end\n");
#endif
}

/* Reset and setup CD180 chip */
static int aurora_init_CD180(struct Aurora_board * bp, int chip)
{
      unsigned long flags;
      int id;
      
#ifdef AURORA_DEBUG
      printk("aurora_init_CD180: start %d:%d\n",
             board_No(bp), chip);
#endif
      save_flags(flags); cli();
      sbus_writeb(0, &bp->r[chip]->r[CD180_CAR]);
      sbus_writeb(0, &bp->r[chip]->r[CD180_GSVR]);

      /* Wait for CCR ready        */
      aurora_wait_CCR(bp->r[chip]);

      /* Reset CD180 chip          */
      sbus_writeb(CCR_HARDRESET, &bp->r[chip]->r[CD180_CCR]);
      udelay(1);
      sti();
      id=1000;
      while((--id) &&
            (sbus_readb(&bp->r[chip]->r[CD180_GSVR])!=0xff))udelay(100);
      if(!id) {
            printk(KERN_ERR "aurora%d: Chip %d failed init.\n",
                   board_No(bp), chip);
            restore_flags(flags);
            return(-1);
      }
      cli();
      sbus_writeb((board_No(bp)<<5)|((chip+1)<<3),
                &bp->r[chip]->r[CD180_GSVR]); /* Set ID for this chip      */
      sbus_writeb(0x80|bp->ACK_MINT,
                &bp->r[chip]->r[CD180_MSMR]); /* Prio for modem intr       */
      sbus_writeb(0x80|bp->ACK_TINT,
                &bp->r[chip]->r[CD180_TSMR]); /* Prio for transmitter intr */
      sbus_writeb(0x80|bp->ACK_RINT,
                &bp->r[chip]->r[CD180_RSMR]); /* Prio for receiver intr    */
      /* Setting up prescaler. We need 4 tick per 1 ms */
      sbus_writeb((bp->oscfreq/(1000000/AURORA_TPS)) >> 8,
                &bp->r[chip]->r[CD180_PPRH]);
      sbus_writeb((bp->oscfreq/(1000000/AURORA_TPS)) & 0xff,
                &bp->r[chip]->r[CD180_PPRL]);

      sbus_writeb(SRCR_AUTOPRI|SRCR_GLOBPRI,
                &bp->r[chip]->r[CD180_SRCR]);

      id = sbus_readb(&bp->r[chip]->r[CD180_GFRCR]);
      printk(KERN_INFO "aurora%d: Chip %d id %02x: ",
             board_No(bp), chip,id);
      if(sbus_readb(&bp->r[chip]->r[CD180_SRCR]) & 128) {
            switch (id) {
                  case 0x82:printk("CL-CD1864 rev A\n");break;
                  case 0x83:printk("CL-CD1865 rev A\n");break;
                  case 0x84:printk("CL-CD1865 rev B\n");break;
                  case 0x85:printk("CL-CD1865 rev C\n");break;
                  default:printk("Unknown.\n");
            };
      } else {
            switch (id) {
                  case 0x81:printk("CL-CD180 rev B\n");break;
                  case 0x82:printk("CL-CD180 rev C\n");break;
                  default:printk("Unknown.\n");
            };
      }
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_init_CD180: end\n");
#endif
      return 0;
}

static int valid_irq(unsigned char irq)
{
int i;
for(i=0;i<TYPE_1_IRQS;i++)
      if (type_1_irq[i]==irq) return 1;
return 0;
}

static irqreturn_t aurora_interrupt(int irq, void * dev_id, struct pt_regs * regs);

/* Main probing routine, also sets irq. */
static int aurora_probe(void)
{
      struct sbus_bus *sbus;
      struct sbus_dev *sdev;
      int grrr;
      char buf[30];
      int bn = 0;
      struct Aurora_board *bp;

      for_each_sbus(sbus) {
            for_each_sbusdev(sdev, sbus) {
/*                printk("Try: %x %s\n",sdev,sdev->prom_name);*/
                  if (!strcmp(sdev->prom_name, "sio16")) {
#ifdef AURORA_DEBUG
                        printk(KERN_INFO "aurora: sio16 at %p\n",sdev);
#endif
                        if((sdev->reg_addrs[0].reg_size!=1) &&
                           (sdev->reg_addrs[1].reg_size!=128) &&
                           (sdev->reg_addrs[2].reg_size!=128) &&
                           (sdev->reg_addrs[3].reg_size!=4)) {
                              printk(KERN_ERR "aurora%d: registers' sizes "
                                     "do not match.\n", bn);
                              break;
                        }
                        bp = &aurora_board[bn];
                        bp->r0 = (struct aurora_reg1 *)
                              sbus_ioremap(&sdev->resource[0], 0,
                                         sdev->reg_addrs[0].reg_size,
                                         "sio16");
                        if (bp->r0 == NULL) {
                              printk(KERN_ERR "aurora%d: can't map "
                                     "reg_addrs[0]\n", bn);
                              break;
                        }
#ifdef AURORA_DEBUG
                        printk("Map reg 0: %p\n", bp->r0);
#endif
                        bp->r[0] = (struct aurora_reg128 *)
                              sbus_ioremap(&sdev->resource[1], 0,
                                         sdev->reg_addrs[1].reg_size,
                                         "sio16");
                        if (bp->r[0] == NULL) {
                              printk(KERN_ERR "aurora%d: can't map "
                                     "reg_addrs[1]\n", bn);
                              break;
                        }
#ifdef AURORA_DEBUG
                        printk("Map reg 1: %p\n", bp->r[0]);
#endif
                        bp->r[1] = (struct aurora_reg128 *)
                              sbus_ioremap(&sdev->resource[2], 0,
                                         sdev->reg_addrs[2].reg_size,
                                         "sio16");
                        if (bp->r[1] == NULL) {
                              printk(KERN_ERR "aurora%d: can't map "
                                     "reg_addrs[2]\n", bn);
                              break;
                        }
#ifdef AURORA_DEBUG
                        printk("Map reg 2: %p\n", bp->r[1]);
#endif
                        bp->r3 = (struct aurora_reg4 *)
                              sbus_ioremap(&sdev->resource[3], 0,
                                         sdev->reg_addrs[3].reg_size,
                                         "sio16");
                        if (bp->r3 == NULL) {
                              printk(KERN_ERR "aurora%d: can't map "
                                     "reg_addrs[3]\n", bn);
                              break;
                        }
#ifdef AURORA_DEBUG
                        printk("Map reg 3: %p\n", bp->r3);
#endif
                        /* Variables setup */
                        bp->flags = 0;
#ifdef AURORA_DEBUG
                        grrr=prom_getint(sdev->prom_node,"intr");
                        printk("intr pri %d\n", grrr);
#endif
                        if ((bp->irq=irqs[bn]) && valid_irq(bp->irq) &&
                            !request_irq(bp->irq|0x30, aurora_interrupt, IRQF_SHARED, "sio16", bp)) {
                              free_irq(bp->irq|0x30, bp);
                        } else
                        if ((bp->irq=prom_getint(sdev->prom_node, "bintr")) && valid_irq(bp->irq) &&
                            !request_irq(bp->irq|0x30, aurora_interrupt, IRQF_SHARED, "sio16", bp)) {
                              free_irq(bp->irq|0x30, bp);
                        } else
                        if ((bp->irq=prom_getint(sdev->prom_node, "intr")) && valid_irq(bp->irq) &&
                            !request_irq(bp->irq|0x30, aurora_interrupt, IRQF_SHARED, "sio16", bp)) {
                              free_irq(bp->irq|0x30, bp);
                        } else
                        for(grrr=0;grrr<TYPE_1_IRQS;grrr++) {
                              if ((bp->irq=type_1_irq[grrr])&&!request_irq(bp->irq|0x30, aurora_interrupt, IRQF_SHARED, "sio16", bp)) {
                                    free_irq(bp->irq|0x30, bp);
                                    break;
                              } else {
                              printk(KERN_ERR "aurora%d: Could not get an irq for this board !!!\n",bn);
                              bp->flags=0xff;
                              }
                        }
                        if(bp->flags==0xff)break;
                        printk(KERN_INFO "aurora%d: irq %d\n",bn,bp->irq&0x0f);
                        buf[0]=0;
                        grrr=prom_getproperty(sdev->prom_node,"dtr_rts",buf,sizeof(buf));
                        if(!strcmp(buf,"swapped")){
                              printk(KERN_INFO "aurora%d: Swapped DTR and RTS\n",bn);
                              bp->DTR=MSVR_RTS;
                              bp->RTS=MSVR_DTR;
                              bp->MSVDTR=CD180_MSVRTS;
                              bp->MSVRTS=CD180_MSVDTR;
                              bp->flags|=AURORA_BOARD_DTR_FLOW_OK;
                              }else{
                              #ifdef AURORA_FORCE_DTR_FLOW
                              printk(KERN_INFO "aurora%d: Forcing swapped DTR-RTS\n",bn);
                              bp->DTR=MSVR_RTS;
                              bp->RTS=MSVR_DTR;
                              bp->MSVDTR=CD180_MSVRTS;
                              bp->MSVRTS=CD180_MSVDTR;
                              bp->flags|=AURORA_BOARD_DTR_FLOW_OK;
                              #else
                              printk(KERN_INFO "aurora%d: Normal DTR and RTS\n",bn);
                              bp->DTR=MSVR_DTR;
                              bp->RTS=MSVR_RTS;
                              bp->MSVDTR=CD180_MSVDTR;
                              bp->MSVRTS=CD180_MSVRTS;
                              #endif
                        }
                        bp->oscfreq=prom_getint(sdev->prom_node,"clk")*100;
                        printk(KERN_INFO "aurora%d: Oscillator: %d Hz\n",bn,bp->oscfreq);
                        grrr=prom_getproperty(sdev->prom_node,"chip",buf,sizeof(buf));
                        printk(KERN_INFO "aurora%d: Chips: %s\n",bn,buf);
                        grrr=prom_getproperty(sdev->prom_node,"manu",buf,sizeof(buf));
                        printk(KERN_INFO "aurora%d: Manufacturer: %s\n",bn,buf);
                        grrr=prom_getproperty(sdev->prom_node,"model",buf,sizeof(buf));
                        printk(KERN_INFO "aurora%d: Model: %s\n",bn,buf);
                        grrr=prom_getproperty(sdev->prom_node,"rev",buf,sizeof(buf));
                        printk(KERN_INFO "aurora%d: Revision: %s\n",bn,buf);
                        grrr=prom_getproperty(sdev->prom_node,"mode",buf,sizeof(buf));
                        printk(KERN_INFO "aurora%d: Mode: %s\n",bn,buf);
                        #ifdef MODULE
                        bp->count=0;
                        #endif
                        bp->flags = AURORA_BOARD_PRESENT;
                        /* hardware ack */
                        bp->ACK_MINT=1;
                        bp->ACK_TINT=2;
                        bp->ACK_RINT=3;
                        bn++;
                  }
            }
      }
      return bn;
}

static void aurora_release_io_range(struct Aurora_board *bp)
{
      sbus_iounmap((unsigned long)bp->r0, 1);
      sbus_iounmap((unsigned long)bp->r[0], 128);
      sbus_iounmap((unsigned long)bp->r[1], 128);
      sbus_iounmap((unsigned long)bp->r3, 4);
}

static inline void aurora_mark_event(struct Aurora_port * port, int event)
{
#ifdef AURORA_DEBUG
      printk("aurora_mark_event: start\n");
#endif
      set_bit(event, &port->event);
      queue_task(&port->tqueue, &tq_aurora);
      mark_bh(AURORA_BH);
#ifdef AURORA_DEBUG
      printk("aurora_mark_event: end\n");
#endif
}

static __inline__ struct Aurora_port * aurora_get_port(struct Aurora_board const * bp,
                                           int chip,
                                           unsigned char const *what)
{
      unsigned char channel;
      struct Aurora_port * port;

      channel = ((chip << 3) |
               ((sbus_readb(&bp->r[chip]->r[CD180_GSCR]) & GSCR_CHAN) >> GSCR_CHAN_OFF));
      port = &aurora_port[board_No(bp) * AURORA_NPORT * AURORA_NCD180 + channel];
      if (port->flags & ASYNC_INITIALIZED)
            return port;

      printk(KERN_DEBUG "aurora%d: %s interrupt from invalid port %d\n",
             board_No(bp), what, channel);
      return NULL;
}

static void aurora_receive_exc(struct Aurora_board const * bp, int chip)
{
      struct Aurora_port *port;
      struct tty_struct *tty;
      unsigned char status;
      unsigned char ch;
      
      if (!(port = aurora_get_port(bp, chip, "Receive_x")))
            return;

      tty = port->tty;
      if (tty->flip.count >= TTY_FLIPBUF_SIZE)  {
#ifdef AURORA_INTNORM
            printk("aurora%d: port %d: Working around flip buffer overflow.\n",
                   board_No(bp), port_No(port));
#endif
            return;
      }
      
#ifdef AURORA_REPORT_OVERRUN  
      status = sbus_readb(&bp->r[chip]->r[CD180_RCSR]);
      if (status & RCSR_OE)  {
            port->overrun++;
#if 1
            printk("aurora%d: port %d: Overrun. Total %ld overruns.\n",
                   board_No(bp), port_No(port), port->overrun);
#endif            
      }
      status &= port->mark_mask;
#else 
      status = sbus_readb(&bp->r[chip]->r[CD180_RCSR]) & port->mark_mask;
#endif      
      ch = sbus_readb(&bp->r[chip]->r[CD180_RDR]);
      if (!status)
            return;

      if (status & RCSR_TOUT)  {
/*          printk("aurora%d: port %d: Receiver timeout. Hardware problems ?\n",
                   board_No(bp), port_No(port));*/
            return;
            
      } else if (status & RCSR_BREAK)  {
            printk(KERN_DEBUG "aurora%d: port %d: Handling break...\n",
                   board_No(bp), port_No(port));
            *tty->flip.flag_buf_ptr++ = TTY_BREAK;
            if (port->flags & ASYNC_SAK)
                  do_SAK(tty);
            
      } else if (status & RCSR_PE) 
            *tty->flip.flag_buf_ptr++ = TTY_PARITY;
      
      else if (status & RCSR_FE) 
            *tty->flip.flag_buf_ptr++ = TTY_FRAME;
      
        else if (status & RCSR_OE)
            *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
      
      else
            *tty->flip.flag_buf_ptr++ = 0;
      
      *tty->flip.char_buf_ptr++ = ch;
      tty->flip.count++;
      queue_task(&tty->flip.tqueue, &tq_timer);
}

static void aurora_receive(struct Aurora_board const * bp, int chip)
{
      struct Aurora_port *port;
      struct tty_struct *tty;
      unsigned char count,cnt;

      if (!(port = aurora_get_port(bp, chip, "Receive")))
            return;
      
      tty = port->tty;
      
      count = sbus_readb(&bp->r[chip]->r[CD180_RDCR]);

#ifdef AURORA_REPORT_FIFO
      port->hits[count > 8 ? 9 : count]++;
#endif

      while (count--)  {
            if (tty->flip.count >= TTY_FLIPBUF_SIZE)  {
#ifdef AURORA_INTNORM
                  printk("aurora%d: port %d: Working around flip buffer overflow.\n",
                         board_No(bp), port_No(port));
#endif
                  break;
            }
            cnt = sbus_readb(&bp->r[chip]->r[CD180_RDR]);
            *tty->flip.char_buf_ptr++ = cnt;
            *tty->flip.flag_buf_ptr++ = 0;
            tty->flip.count++;
      }
      queue_task(&tty->flip.tqueue, &tq_timer);
}

static void aurora_transmit(struct Aurora_board const * bp, int chip)
{
      struct Aurora_port *port;
      struct tty_struct *tty;
      unsigned char count;
      
      if (!(port = aurora_get_port(bp, chip, "Transmit")))
            return;
            
      tty = port->tty;
      
      if (port->SRER & SRER_TXEMPTY)  {
            /* FIFO drained */
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            port->SRER &= ~SRER_TXEMPTY;
            sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
            return;
      }
      
      if ((port->xmit_cnt <= 0 && !port->break_length)
          || tty->stopped || tty->hw_stopped)  {
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            port->SRER &= ~SRER_TXRDY;
            sbus_writeb(port->SRER,
                      &bp->r[chip]->r[CD180_SRER]);
            return;
      }
      
      if (port->break_length)  {
            if (port->break_length > 0)  {
                  if (port->COR2 & COR2_ETC)  {
                        sbus_writeb(CD180_C_ESC,
                                  &bp->r[chip]->r[CD180_TDR]);
                        sbus_writeb(CD180_C_SBRK,
                                  &bp->r[chip]->r[CD180_TDR]);
                        port->COR2 &= ~COR2_ETC;
                  }
                  count = min(port->break_length, 0xff);
                  sbus_writeb(CD180_C_ESC,
                            &bp->r[chip]->r[CD180_TDR]);
                  sbus_writeb(CD180_C_DELAY,
                            &bp->r[chip]->r[CD180_TDR]);
                  sbus_writeb(count,
                            &bp->r[chip]->r[CD180_TDR]);
                  if (!(port->break_length -= count))
                        port->break_length--;
            } else  {
                  sbus_writeb(CD180_C_ESC,
                            &bp->r[chip]->r[CD180_TDR]);
                  sbus_writeb(CD180_C_EBRK,
                            &bp->r[chip]->r[CD180_TDR]);
                  sbus_writeb(port->COR2,
                            &bp->r[chip]->r[CD180_COR2]);
                  aurora_wait_CCR(bp->r[chip]);
                  sbus_writeb(CCR_CORCHG2,
                            &bp->r[chip]->r[CD180_CCR]);
                  port->break_length = 0;
            }
            return;
      }
      
      count = CD180_NFIFO;
      do {
            u8 byte = port->xmit_buf[port->xmit_tail++];

            sbus_writeb(byte, &bp->r[chip]->r[CD180_TDR]);
            port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
            if (--port->xmit_cnt <= 0)
                  break;
      } while (--count > 0);
      
      if (port->xmit_cnt <= 0)  {
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            port->SRER &= ~SRER_TXRDY;
            sbus_writeb(port->SRER,
                      &bp->r[chip]->r[CD180_SRER]);
      }
      if (port->xmit_cnt <= port->wakeup_chars)
            aurora_mark_event(port, RS_EVENT_WRITE_WAKEUP);
}

static void aurora_check_modem(struct Aurora_board const * bp, int chip)
{
      struct Aurora_port *port;
      struct tty_struct *tty;
      unsigned char mcr;
      
      if (!(port = aurora_get_port(bp, chip, "Modem")))
            return;
            
      tty = port->tty;
      
      mcr = sbus_readb(&bp->r[chip]->r[CD180_MCR]);
      if (mcr & MCR_CDCHG)  {
            if (sbus_readb(&bp->r[chip]->r[CD180_MSVR]) & MSVR_CD) 
                  wake_up_interruptible(&port->open_wait);
            else
                  schedule_task(&port->tqueue_hangup);
      }
      
/* We don't have such things yet. My aurora board has DTR and RTS swapped, but that doesn't count in this driver. Let's hope
 * Aurora didn't made any boards with CTS or DSR broken...
 */
/* #ifdef AURORA_BRAIN_DAMAGED_CTS
      if (mcr & MCR_CTSCHG)  {
            if (aurora_in(bp, CD180_MSVR) & MSVR_CTS)  {
                  tty->hw_stopped = 0;
                  port->SRER |= SRER_TXRDY;
                  if (port->xmit_cnt <= port->wakeup_chars)
                        aurora_mark_event(port, RS_EVENT_WRITE_WAKEUP);
            } else  {
                  tty->hw_stopped = 1;
                  port->SRER &= ~SRER_TXRDY;
            }
            sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      }
      if (mcr & MCR_DSRCHG)  {
            if (aurora_in(bp, CD180_MSVR) & MSVR_DSR)  {
                  tty->hw_stopped = 0;
                  port->SRER |= SRER_TXRDY;
                  if (port->xmit_cnt <= port->wakeup_chars)
                        aurora_mark_event(port, RS_EVENT_WRITE_WAKEUP);
            } else  {
                  tty->hw_stopped = 1;
                  port->SRER &= ~SRER_TXRDY;
            }
            sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      }
#endif AURORA_BRAIN_DAMAGED_CTS */
      
      /* Clear change bits */
      sbus_writeb(0, &bp->r[chip]->r[CD180_MCR]);
}

/* The main interrupt processing routine */
static irqreturn_t aurora_interrupt(int irq, void * dev_id, struct pt_regs * regs)
{
      unsigned char status;
      unsigned char ack,chip/*,chip_id*/;
      struct Aurora_board * bp = (struct Aurora_board *) dev_id;
      unsigned long loop = 0;

#ifdef AURORA_INT_DEBUG
      printk("IRQ%d %d\n",irq,++irqhit);
#ifdef AURORA_FLOODPRO
      if (irqhit>=AURORA_FLOODPRO)
            sbus_writeb(8, &bp->r0->r);
#endif
#endif
      
/* old      bp = IRQ_to_board[irq&0x0f];*/
      
      if (!bp || !(bp->flags & AURORA_BOARD_ACTIVE))
            return IRQ_NONE;

/*    The while() below takes care of this.
      status = sbus_readb(&bp->r[0]->r[CD180_SRSR]);
#ifdef AURORA_INT_DEBUG
      printk("mumu: %02x\n", status);
#endif
      if (!(status&SRSR_ANYINT))
            return IRQ_NONE; * Nobody has anything to say, so exit *
*/
      while ((loop++ < 48) &&
             (status = sbus_readb(&bp->r[0]->r[CD180_SRSR]) & SRSR_ANYINT)){
#ifdef AURORA_INT_DEBUG
            printk("SRSR: %02x\n", status);
#endif
            if (status & SRSR_REXT) {
                  ack = sbus_readb(&bp->r3->r[bp->ACK_RINT]);
#ifdef AURORA_INT_DEBUG
                  printk("R-ACK %02x\n", ack);
#endif
                  if ((ack >> 5) == board_No(bp)) {
                        if ((chip=((ack>>3)&3)-1) < AURORA_NCD180) {
                              if ((ack&GSVR_ITMASK)==GSVR_IT_RGD) {
                                    aurora_receive(bp,chip);
                                    sbus_writeb(0,
                                           &bp->r[chip]->r[CD180_EOSRR]);
                              } else if ((ack & GSVR_ITMASK) == GSVR_IT_REXC) {
                                    aurora_receive_exc(bp,chip);
                                    sbus_writeb(0,
                                           &bp->r[chip]->r[CD180_EOSRR]);
                              }
                        }
                  }
            } else if (status & SRSR_TEXT) {
                  ack = sbus_readb(&bp->r3->r[bp->ACK_TINT]);
#ifdef AURORA_INT_DEBUG
                  printk("T-ACK %02x\n", ack);
#endif
                  if ((ack >> 5) == board_No(bp)) {
                        if ((chip=((ack>>3)&3)-1) < AURORA_NCD180) {
                              if ((ack&GSVR_ITMASK)==GSVR_IT_TX) {
                                    aurora_transmit(bp,chip);
                                    sbus_writeb(0,
                                           &bp->r[chip]->r[CD180_EOSRR]);
                              }
                        }
                  }
            } else if (status & SRSR_MEXT) {
                  ack = sbus_readb(&bp->r3->r[bp->ACK_MINT]);
#ifdef AURORA_INT_DEBUG
                  printk("M-ACK %02x\n", ack);
#endif
                  if ((ack >> 5) == board_No(bp)) {
                        if ((chip = ((ack>>3)&3)-1) < AURORA_NCD180) {
                              if ((ack&GSVR_ITMASK)==GSVR_IT_MDM) {
                                    aurora_check_modem(bp,chip);
                                    sbus_writeb(0,
                                           &bp->r[chip]->r[CD180_EOSRR]);
                              }
                        }
                  }
            }
      }
/* I guess this faster code can be used with CD1865, using AUROPRI and GLOBPRI. */
#if 0
      while ((loop++ < 48)&&(status=bp->r[0]->r[CD180_SRSR]&SRSR_ANYINT)){
#ifdef AURORA_INT_DEBUG
            printk("SRSR: %02x\n",status);
#endif
            ack = sbus_readb(&bp->r3->r[0]);
#ifdef AURORA_INT_DEBUG
            printk("ACK: %02x\n",ack);
#endif
            if ((ack>>5)==board_No(bp)) {
                  if ((chip=((ack>>3)&3)-1) < AURORA_NCD180) {
                        ack&=GSVR_ITMASK;
                        if (ack==GSVR_IT_RGD) {
                              aurora_receive(bp,chip);
                              sbus_writeb(0,
                                        &bp->r[chip]->r[CD180_EOSRR]);
                        } else if (ack==GSVR_IT_REXC) {
                              aurora_receive_exc(bp,chip);
                              sbus_writeb(0,
                                        &bp->r[chip]->r[CD180_EOSRR]);
                        } else if (ack==GSVR_IT_TX) {
                              aurora_transmit(bp,chip);
                              sbus_writeb(0,
                                        &bp->r[chip]->r[CD180_EOSRR]);
                        } else if (ack==GSVR_IT_MDM) {
                              aurora_check_modem(bp,chip);
                              sbus_writeb(0,
                                        &bp->r[chip]->r[CD180_EOSRR]);
                        }
                  }
            }
      }
#endif

/* This is the old handling routine, used in riscom8 for only one CD180. I keep it here for reference. */
#if 0
      for(chip=0;chip<AURORA_NCD180;chip++){
            chip_id=(board_No(bp)<<5)|((chip+1)<<3);
            loop=0;
            while ((loop++ < 1) &&
                   ((status = sbus_readb(&bp->r[chip]->r[CD180_SRSR])) &
                  (SRSR_TEXT | SRSR_MEXT | SRSR_REXT))) {

                  if (status & SRSR_REXT) {
                        ack = sbus_readb(&bp->r3->r[bp->ACK_RINT]);
                        if (ack == (chip_id | GSVR_IT_RGD)) {
#ifdef AURORA_INTMSG
                              printk("RX ACK\n");
#endif
                              aurora_receive(bp,chip);
                        } else if (ack == (chip_id | GSVR_IT_REXC)) {
#ifdef AURORA_INTMSG
                              printk("RXC ACK\n");
#endif
                              aurora_receive_exc(bp,chip);
                        } else {
#ifdef AURORA_INTNORM
                              printk("aurora%d-%d: Bad receive ack 0x%02x.\n",
                                     board_No(bp), chip, ack);
#endif
                        }
                  } else if (status & SRSR_TEXT) {
                        ack = sbus_readb(&bp->r3->r[bp->ACK_TINT]);
                        if (ack == (chip_id | GSVR_IT_TX)){
#ifdef AURORA_INTMSG
                              printk("TX ACK\n");
#endif
                              aurora_transmit(bp,chip);
                        } else {
#ifdef AURORA_INTNORM
                              printk("aurora%d-%d: Bad transmit ack 0x%02x.\n",
                                     board_No(bp), chip, ack);
#endif
                        }
                  } else  if (status & SRSR_MEXT)  {
                        ack = sbus_readb(&bp->r3->r[bp->ACK_MINT]);
                        if (ack == (chip_id | GSVR_IT_MDM)){
#ifdef AURORA_INTMSG
                              printk("MDM ACK\n");
#endif
                              aurora_check_modem(bp,chip);
                        } else {
#ifdef AURORA_INTNORM
                              printk("aurora%d-%d: Bad modem ack 0x%02x.\n",
                                     board_No(bp), chip, ack);
#endif
                        }
                  }
                  sbus_writeb(0, &bp->r[chip]->r[CD180_EOSRR]);
            }
      }
#endif

      return IRQ_HANDLED;
}

#ifdef AURORA_INT_DEBUG
static void aurora_timer (unsigned long ignored);

static DEFINE_TIMER(aurora_poll_timer, aurora_timer, 0, 0);

static void
aurora_timer (unsigned long ignored)
{
      unsigned long flags;
      int i;

      save_flags(flags); cli();

      printk("SRSR: %02x,%02x - ",
             sbus_readb(&aurora_board[0].r[0]->r[CD180_SRSR]),
             sbus_readb(&aurora_board[0].r[1]->r[CD180_SRSR]));
      for (i = 0; i < 4; i++) {
            udelay(1);
            printk("%02x ",
                   sbus_readb(&aurora_board[0].r3->r[i]));
      }
      printk("\n");

      aurora_poll_timer.expires = jiffies + 300;
      add_timer (&aurora_poll_timer);

      restore_flags(flags);
}
#endif

/*
 *  Routines for open & close processing.
 */

/* Called with disabled interrupts */
static int aurora_setup_board(struct Aurora_board * bp)
{
      int error;
      
#ifdef AURORA_ALLIRQ
      int i;
      for (i = 0; i < AURORA_ALLIRQ; i++) {
            error = request_irq(allirq[i]|0x30, aurora_interrupt, IRQF_SHARED,
                            "sio16", bp);
            if (error)
                  printk(KERN_ERR "IRQ%d request error %d\n",
                         allirq[i], error);
      }
#else
      error = request_irq(bp->irq|0x30, aurora_interrupt, IRQF_SHARED,
                      "sio16", bp);
      if (error) {
            printk(KERN_ERR "IRQ request error %d\n", error);
            return error;
      }
#endif
      /* Board reset */
      sbus_writeb(0, &bp->r0->r);
      udelay(1);
      if (bp->flags & AURORA_BOARD_TYPE_2) {
            /* unknown yet */
      } else {
            sbus_writeb((AURORA_CFG_ENABLE_IO | AURORA_CFG_ENABLE_IRQ |
                       (((bp->irq)&0x0f)>>2)),
                      &bp->r0->r);
      }
      udelay(10000);

      if (aurora_init_CD180(bp,0))error=1;error=0;
      if (aurora_init_CD180(bp,1))error++;
      if (error == AURORA_NCD180) {
            printk(KERN_ERR "Both chips failed initialisation.\n");
            return -EIO;
      }

#ifdef AURORA_INT_DEBUG
      aurora_poll_timer.expires= jiffies + 1;
      add_timer(&aurora_poll_timer);
#endif
#ifdef AURORA_DEBUG
      printk("aurora_setup_board: end\n");
#endif
      return 0;
}

/* Called with disabled interrupts */
static void aurora_shutdown_board(struct Aurora_board *bp)
{
      int i;

#ifdef AURORA_DEBUG
      printk("aurora_shutdown_board: start\n");
#endif

#ifdef AURORA_INT_DEBUG
      del_timer(&aurora_poll_timer);
#endif

#ifdef AURORA_ALLIRQ
      for(i=0;i<AURORA_ALLIRQ;i++){
            free_irq(allirq[i]|0x30, bp);
/*          IRQ_to_board[allirq[i]&0xf] = NULL;*/
      }
#else
      free_irq(bp->irq|0x30, bp);
/*    IRQ_to_board[bp->irq&0xf] = NULL;*/
#endif      
      /* Drop all DTR's */
      for(i=0;i<16;i++){
            sbus_writeb(i & 7, &bp->r[i>>3]->r[CD180_CAR]);
            udelay(1);
            sbus_writeb(0, &bp->r[i>>3]->r[CD180_MSVR]);
            udelay(1);
      }
      /* Board shutdown */
      sbus_writeb(0, &bp->r0->r);

#ifdef AURORA_DEBUG
      printk("aurora_shutdown_board: end\n");
#endif
}

/* Setting up port characteristics. 
 * Must be called with disabled interrupts
 */
static void aurora_change_speed(struct Aurora_board *bp, struct Aurora_port *port)
{
      struct tty_struct *tty;
      unsigned long baud;
      long tmp;
      unsigned char cor1 = 0, cor3 = 0;
      unsigned char mcor1 = 0, mcor2 = 0,chip;
      
#ifdef AURORA_DEBUG
      printk("aurora_change_speed: start\n");
#endif
      if (!(tty = port->tty) || !tty->termios)
            return;
            
      chip = AURORA_CD180(port_No(port));

      port->SRER  = 0;
      port->COR2 = 0;
      port->MSVR = MSVR_RTS|MSVR_DTR;
      
      baud = tty_get_baud_rate(tty);
      
      /* Select port on the board */
      sbus_writeb(port_No(port) & 7,
                &bp->r[chip]->r[CD180_CAR]);
      udelay(1);
      
      if (!baud)  {
            /* Drop DTR & exit */
            port->MSVR &= ~(bp->DTR|bp->RTS);
            sbus_writeb(port->MSVR,
                      &bp->r[chip]->r[CD180_MSVR]);
            return;
      } else  {
            /* Set DTR on */
            port->MSVR |= bp->DTR;
            sbus_writeb(port->MSVR,
                      &bp->r[chip]->r[CD180_MSVR]);
      }
      
      /* Now we must calculate some speed dependent things. */
      
      /* Set baud rate for port. */
      tmp = (((bp->oscfreq + baud/2) / baud +
            CD180_TPC/2) / CD180_TPC);

/*    tmp = (bp->oscfreq/7)/baud;
      if((tmp%10)>4)tmp=tmp/10+1;else tmp=tmp/10;*/
/*    printk("Prescaler period: %d\n",tmp);*/

      sbus_writeb((tmp >> 8) & 0xff,
                &bp->r[chip]->r[CD180_RBPRH]);
      sbus_writeb((tmp >> 8) & 0xff,
                &bp->r[chip]->r[CD180_TBPRH]);
      sbus_writeb(tmp & 0xff, &bp->r[chip]->r[CD180_RBPRL]);
      sbus_writeb(tmp & 0xff, &bp->r[chip]->r[CD180_TBPRL]);
      
      baud = (baud + 5) / 10;   /* Estimated CPS */
      
      /* Two timer ticks seems enough to wakeup something like SLIP driver */
      tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;         
      port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
                                    SERIAL_XMIT_SIZE - 1 : tmp);
      
      /* Receiver timeout will be transmission time for 1.5 chars */
      tmp = (AURORA_TPS + AURORA_TPS/2 + baud/2) / baud;
      tmp = (tmp > 0xff) ? 0xff : tmp;
      sbus_writeb(tmp, &bp->r[chip]->r[CD180_RTPR]);
      
      switch (C_CSIZE(tty))  {
       case CS5:
            cor1 |= COR1_5BITS;
            break;
       case CS6:
            cor1 |= COR1_6BITS;
            break;
       case CS7:
            cor1 |= COR1_7BITS;
            break;
       case CS8:
            cor1 |= COR1_8BITS;
            break;
      }
      
      if (C_CSTOPB(tty)) 
            cor1 |= COR1_2SB;
      
      cor1 |= COR1_IGNORE;
      if (C_PARENB(tty))  {
            cor1 |= COR1_NORMPAR;
            if (C_PARODD(tty)) 
                  cor1 |= COR1_ODDP;
            if (I_INPCK(tty)) 
                  cor1 &= ~COR1_IGNORE;
      }
      /* Set marking of some errors */
      port->mark_mask = RCSR_OE | RCSR_TOUT;
      if (I_INPCK(tty)) 
            port->mark_mask |= RCSR_FE | RCSR_PE;
      if (I_BRKINT(tty) || I_PARMRK(tty)) 
            port->mark_mask |= RCSR_BREAK;
      if (I_IGNPAR(tty)) 
            port->mark_mask &= ~(RCSR_FE | RCSR_PE);
      if (I_IGNBRK(tty))  {
            port->mark_mask &= ~RCSR_BREAK;
            if (I_IGNPAR(tty)) 
                  /* Real raw mode. Ignore all */
                  port->mark_mask &= ~RCSR_OE;
      }
      /* Enable Hardware Flow Control */
      if (C_CRTSCTS(tty))  {
/*#ifdef AURORA_BRAIN_DAMAGED_CTS
            port->SRER |= SRER_DSR | SRER_CTS;
            mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
            mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
            tty->hw_stopped = !(aurora_in(bp, CD180_MSVR) & (MSVR_CTS|MSVR_DSR));
#else*/
            port->COR2 |= COR2_CTSAE;
/*#endif*/
            if (bp->flags&AURORA_BOARD_DTR_FLOW_OK) {
                  mcor1 |= AURORA_RXTH;
            }
      }
      /* Enable Software Flow Control. FIXME: I'm not sure about this */
      /* Some people reported that it works, but I still doubt */
      if (I_IXON(tty))  {
            port->COR2 |= COR2_TXIBE;
            cor3 |= (COR3_FCT | COR3_SCDE);
            if (I_IXANY(tty))
                  port->COR2 |= COR2_IXM;
            sbus_writeb(START_CHAR(tty),
                      &bp->r[chip]->r[CD180_SCHR1]);
            sbus_writeb(STOP_CHAR(tty),
                      &bp->r[chip]->r[CD180_SCHR2]);
            sbus_writeb(START_CHAR(tty),
                      &bp->r[chip]->r[CD180_SCHR3]);
            sbus_writeb(STOP_CHAR(tty),
                      &bp->r[chip]->r[CD180_SCHR4]);
      }
      if (!C_CLOCAL(tty))  {
            /* Enable CD check */
            port->SRER |= SRER_CD;
            mcor1 |= MCOR1_CDZD;
            mcor2 |= MCOR2_CDOD;
      }
      
      if (C_CREAD(tty)) 
            /* Enable receiver */
            port->SRER |= SRER_RXD;
      
      /* Set input FIFO size (1-8 bytes) */
      cor3 |= AURORA_RXFIFO; 
      /* Setting up CD180 channel registers */
      sbus_writeb(cor1, &bp->r[chip]->r[CD180_COR1]);
      sbus_writeb(port->COR2, &bp->r[chip]->r[CD180_COR2]);
      sbus_writeb(cor3, &bp->r[chip]->r[CD180_COR3]);
      /* Make CD180 know about registers change */
      aurora_wait_CCR(bp->r[chip]);
      sbus_writeb(CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3,
                &bp->r[chip]->r[CD180_CCR]);
      /* Setting up modem option registers */
      sbus_writeb(mcor1, &bp->r[chip]->r[CD180_MCOR1]);
      sbus_writeb(mcor2, &bp->r[chip]->r[CD180_MCOR2]);
      /* Enable CD180 transmitter & receiver */
      aurora_wait_CCR(bp->r[chip]);
      sbus_writeb(CCR_TXEN | CCR_RXEN, &bp->r[chip]->r[CD180_CCR]);
      /* Enable interrupts */
      sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      /* And finally set RTS on */
      sbus_writeb(port->MSVR, &bp->r[chip]->r[CD180_MSVR]);
#ifdef AURORA_DEBUG
      printk("aurora_change_speed: end\n");
#endif
}

/* Must be called with interrupts enabled */
static int aurora_setup_port(struct Aurora_board *bp, struct Aurora_port *port)
{
      unsigned long flags;
      
#ifdef AURORA_DEBUG
      printk("aurora_setup_port: start %d\n",port_No(port));
#endif
      if (port->flags & ASYNC_INITIALIZED)
            return 0;
            
      if (!port->xmit_buf) {
            /* We may sleep in get_zeroed_page() */
            unsigned long tmp;
            
            if (!(tmp = get_zeroed_page(GFP_KERNEL)))
                  return -ENOMEM;
                
            if (port->xmit_buf) {
                  free_page(tmp);
                  return -ERESTARTSYS;
            }
            port->xmit_buf = (unsigned char *) tmp;
      }
            
      save_flags(flags); cli();
            
      if (port->tty) 
            clear_bit(TTY_IO_ERROR, &port->tty->flags);
            
#ifdef MODULE
      if ((port->count == 1) && ((++bp->count) == 1))
                  bp->flags |= AURORA_BOARD_ACTIVE;
#endif

      port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
      aurora_change_speed(bp, port);
      port->flags |= ASYNC_INITIALIZED;
            
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_setup_port: end\n");
#endif
      return 0;
}

/* Must be called with interrupts disabled */
static void aurora_shutdown_port(struct Aurora_board *bp, struct Aurora_port *port)
{
      struct tty_struct *tty;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_shutdown_port: start\n");
#endif
      if (!(port->flags & ASYNC_INITIALIZED)) 
            return;
      
      chip = AURORA_CD180(port_No(port));
      
#ifdef AURORA_REPORT_OVERRUN
      printk("aurora%d: port %d: Total %ld overruns were detected.\n",
             board_No(bp), port_No(port), port->overrun);
#endif      
#ifdef AURORA_REPORT_FIFO
      {
            int i;
            
            printk("aurora%d: port %d: FIFO hits [ ",
                   board_No(bp), port_No(port));
            for (i = 0; i < 10; i++)  {
                  printk("%ld ", port->hits[i]);
            }
            printk("].\n");
      }
#endif      
      if (port->xmit_buf)  {
            free_page((unsigned long) port->xmit_buf);
            port->xmit_buf = NULL;
      }

      if (!(tty = port->tty) || C_HUPCL(tty))  {
            /* Drop DTR */
            port->MSVR &= ~(bp->DTR|bp->RTS);
            sbus_writeb(port->MSVR,
                      &bp->r[chip]->r[CD180_MSVR]);
      }
      
        /* Select port */
      sbus_writeb(port_No(port) & 7,
                &bp->r[chip]->r[CD180_CAR]);
      udelay(1);

      /* Reset port */
      aurora_wait_CCR(bp->r[chip]);
      sbus_writeb(CCR_SOFTRESET, &bp->r[chip]->r[CD180_CCR]);

      /* Disable all interrupts from this port */
      port->SRER = 0;
      sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      
      if (tty)  
            set_bit(TTY_IO_ERROR, &tty->flags);
      port->flags &= ~ASYNC_INITIALIZED;

#ifdef MODULE
      if (--bp->count < 0)  {
            printk(KERN_DEBUG "aurora%d: aurora_shutdown_port: "
                   "bad board count: %d\n",
                   board_No(bp), bp->count);
            bp->count = 0;
      }
      
      if (!bp->count)
            bp->flags &= ~AURORA_BOARD_ACTIVE;
#endif

#ifdef AURORA_DEBUG
      printk("aurora_shutdown_port: end\n");
#endif
}

      
static int block_til_ready(struct tty_struct *tty, struct file * filp,
                     struct Aurora_port *port)
{
      DECLARE_WAITQUEUE(wait, current);
      struct Aurora_board *bp = port_Board(port);
      int    retval;
      int    do_clocal = 0;
      int    CD;
      unsigned char chip;
      
#ifdef AURORA_DEBUG
      printk("block_til_ready: start\n");
#endif
      chip = AURORA_CD180(port_No(port));

      /* 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) || port->flags & ASYNC_CLOSING) {
            interruptible_sleep_on(&port->close_wait);
            if (port->flags & ASYNC_HUP_NOTIFY)
                  return -EAGAIN;
            else
                  return -ERESTARTSYS;
      }

      /* If non-blocking mode is set, or the port is not enabled,
       * then make the check up front and then exit.
       */
      if ((filp->f_flags & O_NONBLOCK) ||
          (tty->flags & (1 << TTY_IO_ERROR))) {
            port->flags |= ASYNC_NORMAL_ACTIVE;
            return 0;
      }

      if (C_CLOCAL(tty))  
            do_clocal = 1;

      /* Block waiting for the carrier detect and the line to become
       * free (i.e., not in use by the callout).  While we are in
       * this loop, info->count is dropped by one, so that
       * rs_close() knows when to free things.  We restore it upon
       * exit, either normal or abnormal.
       */
      retval = 0;
      add_wait_queue(&port->open_wait, &wait);
      cli();
      if (!tty_hung_up_p(filp))
            port->count--;
      sti();
      port->blocked_open++;
      while (1) {
            cli();
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            CD = sbus_readb(&bp->r[chip]->r[CD180_MSVR]) & MSVR_CD;
            port->MSVR=bp->RTS;

            /* auto drops DTR */
            sbus_writeb(port->MSVR, &bp->r[chip]->r[CD180_MSVR]);
            sti();
            set_current_state(TASK_INTERRUPTIBLE);
            if (tty_hung_up_p(filp) ||
                !(port->flags & ASYNC_INITIALIZED)) {
                  if (port->flags & ASYNC_HUP_NOTIFY)
                        retval = -EAGAIN;
                  else
                        retval = -ERESTARTSYS;  
                  break;
            }
            if (!(port->flags & ASYNC_CLOSING) &&
                (do_clocal || CD))
                  break;
            if (signal_pending(current)) {
                  retval = -ERESTARTSYS;
                  break;
            }
            schedule();
      }
      current->state = TASK_RUNNING;
      remove_wait_queue(&port->open_wait, &wait);
      if (!tty_hung_up_p(filp))
            port->count++;
      port->blocked_open--;
      if (retval)
            return retval;
      
      port->flags |= ASYNC_NORMAL_ACTIVE;
#ifdef AURORA_DEBUG
      printk("block_til_ready: end\n");
#endif
      return 0;
}     

static int aurora_open(struct tty_struct * tty, struct file * filp)
{
      int board;
      int error;
      struct Aurora_port * port;
      struct Aurora_board * bp;
      unsigned long flags;
      
#ifdef AURORA_DEBUG
      printk("aurora_open: start\n");
#endif
      
      board = AURORA_BOARD(tty->index);
      if (board > AURORA_NBOARD ||
          !(aurora_board[board].flags & AURORA_BOARD_PRESENT)) {
#ifdef AURORA_DEBUG
            printk("aurora_open: error board %d present %d\n",
                   board, aurora_board[board].flags & AURORA_BOARD_PRESENT);
#endif
            return -ENODEV;
      }
      
      bp = &aurora_board[board];
      port = aurora_port + board * AURORA_NPORT * AURORA_NCD180 + AURORA_PORT(tty->index);
      if ((aurora_paranoia_check(port, tty->name, "aurora_open")) {
#ifdef AURORA_DEBUG
            printk("aurora_open: error paranoia check\n");
#endif
            return -ENODEV;
      }
      
      port->count++;
      tty->driver_data = port;
      port->tty = tty;
      
      if ((error = aurora_setup_port(bp, port))) {
#ifdef AURORA_DEBUG
            printk("aurora_open: error aurora_setup_port ret %d\n",error);
#endif
            return error;
      }

      if ((error = block_til_ready(tty, filp, port))) {
#ifdef AURORA_DEBUG
            printk("aurora_open: error block_til_ready ret %d\n",error);
#endif
            return error;
      }
      
#ifdef AURORA_DEBUG
      printk("aurora_open: end\n");
#endif
      return 0;
}

static void aurora_close(struct tty_struct * tty, struct file * filp)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      unsigned long flags;
      unsigned long timeout;
      unsigned char chip;
      
#ifdef AURORA_DEBUG
      printk("aurora_close: start\n");
#endif
      
      if (!port || (aurora_paranoia_check(port, tty->name, "close"))
            return;
      
      chip = AURORA_CD180(port_No(port));

      save_flags(flags); cli();
      if (tty_hung_up_p(filp))  {
            restore_flags(flags);
            return;
      }
      
      bp = port_Board(port);
      if ((tty->count == 1) && (port->count != 1))  {
            printk(KERN_DEBUG "aurora%d: aurora_close: bad port count; "
                   "tty->count is 1, port count is %d\n",
                   board_No(bp), port->count);
            port->count = 1;
      }
      if (--port->count < 0)  {
            printk(KERN_DEBUG "aurora%d: aurora_close: bad port "
                   "count for tty%d: %d\n",
                   board_No(bp), port_No(port), port->count);
            port->count = 0;
      }
      if (port->count)  {
            restore_flags(flags);
            return;
      }
      port->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 (port->closing_wait != ASYNC_CLOSING_WAIT_NONE){
#ifdef AURORA_DEBUG
            printk("aurora_close: waiting to flush...\n");
#endif
            tty_wait_until_sent(tty, port->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.
       */
      port->SRER &= ~SRER_RXD;
      if (port->flags & ASYNC_INITIALIZED) {
            port->SRER &= ~SRER_TXRDY;
            port->SRER |= SRER_TXEMPTY;
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
            /*
             * Before we drop DTR, make sure the UART transmitter
             * has completely drained; this is especially
             * important if there is a transmit FIFO!
             */
            timeout = jiffies+HZ;
            while(port->SRER & SRER_TXEMPTY)  {
                  msleep_interruptible(jiffies_to_msecs(port->timeout));
                  if (time_after(jiffies, timeout))
                        break;
            }
      }
#ifdef AURORA_DEBUG
      printk("aurora_close: shutdown_port\n");
#endif
      aurora_shutdown_port(bp, port);
      if (tty->driver->flush_buffer)
            tty->driver->flush_buffer(tty);
      tty_ldisc_flush(tty);
      tty->closing = 0;
      port->event = 0;
      port->tty = 0;
      if (port->blocked_open) {
            if (port->close_delay) {
                  msleep_interruptible(jiffies_to_msecs(port->close_delay));
            }
            wake_up_interruptible(&port->open_wait);
      }
      port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
      wake_up_interruptible(&port->close_wait);
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_close: end\n");
#endif
}

static int aurora_write(struct tty_struct * tty, 
                  const unsigned char *buf, int count)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      int c, total = 0;
      unsigned long flags;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_write: start %d\n",count);
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_write"))
            return 0;
            
      chip = AURORA_CD180(port_No(port));
      
      bp = port_Board(port);

      if (!tty || !port->xmit_buf || !tmp_buf)
            return 0;

      save_flags(flags);
      while (1) {
            cli();
            c = min(count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
                           SERIAL_XMIT_SIZE - port->xmit_head));
            if (c <= 0) {
                  restore_flags(flags);
                  break;
            }
            memcpy(port->xmit_buf + port->xmit_head, buf, c);
            port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
            port->xmit_cnt += c;
            restore_flags(flags);

            buf += c;
            count -= c;
            total += c;
      }

      cli();
      if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
          !(port->SRER & SRER_TXRDY)) {
            port->SRER |= SRER_TXRDY;
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      }
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_write: end %d\n",total);
#endif
      return total;
}

static void aurora_put_char(struct tty_struct * tty, unsigned char ch)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      unsigned long flags;

#ifdef AURORA_DEBUG
      printk("aurora_put_char: start %c\n",ch);
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_put_char"))
            return;

      if (!tty || !port->xmit_buf)
            return;

      save_flags(flags); cli();
      
      if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
            restore_flags(flags);
            return;
      }

      port->xmit_buf[port->xmit_head++] = ch;
      port->xmit_head &= SERIAL_XMIT_SIZE - 1;
      port->xmit_cnt++;
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_put_char: end\n");
#endif
}

static void aurora_flush_chars(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      unsigned long flags;
      unsigned char chip;

/*#ifdef AURORA_DEBUG
      printk("aurora_flush_chars: start\n");
#endif*/
      if ((aurora_paranoia_check(port, tty->name, "aurora_flush_chars"))
            return;
            
      chip = AURORA_CD180(port_No(port));
      
      if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
          !port->xmit_buf)
            return;

      save_flags(flags); cli();
      port->SRER |= SRER_TXRDY;
      sbus_writeb(port_No(port) & 7,
                &port_Board(port)->r[chip]->r[CD180_CAR]);
      udelay(1);
      sbus_writeb(port->SRER,
                &port_Board(port)->r[chip]->r[CD180_SRER]);
      restore_flags(flags);
/*#ifdef AURORA_DEBUG
      printk("aurora_flush_chars: end\n");
#endif*/
}

static int aurora_write_room(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      int   ret;

#ifdef AURORA_DEBUG
      printk("aurora_write_room: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_write_room"))
            return 0;

      ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
      if (ret < 0)
            ret = 0;
#ifdef AURORA_DEBUG
      printk("aurora_write_room: end\n");
#endif
      return ret;
}

static int aurora_chars_in_buffer(struct tty_struct *tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
                        
      if ((aurora_paranoia_check(port, tty->name, "aurora_chars_in_buffer"))
            return 0;
      
      return port->xmit_cnt;
}

static void aurora_flush_buffer(struct tty_struct *tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      unsigned long flags;

#ifdef AURORA_DEBUG
      printk("aurora_flush_buffer: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_flush_buffer"))
            return;

      save_flags(flags); cli();
      port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
      restore_flags(flags);
      
      tty_wakeup(tty);
#ifdef AURORA_DEBUG
      printk("aurora_flush_buffer: end\n");
#endif
}

static int aurora_tiocmget(struct tty_struct *tty, struct file *file)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board * bp;
      unsigned char status,chip;
      unsigned int result;
      unsigned long flags;

#ifdef AURORA_DEBUG
      printk("aurora_get_modem_info: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, __FUNCTION__))
            return -ENODEV;

      chip = AURORA_CD180(port_No(port));

      bp = port_Board(port);

      save_flags(flags); cli();

      sbus_writeb(port_No(port) & 7, &bp->r[chip]->r[CD180_CAR]);
      udelay(1);

      status = sbus_readb(&bp->r[chip]->r[CD180_MSVR]);
      result = 0/*bp->r[chip]->r[AURORA_RI] & (1u << port_No(port)) ? 0 : TIOCM_RNG*/;

      restore_flags(flags);

      result |= ((status & bp->RTS) ? TIOCM_RTS : 0)
            | ((status & bp->DTR) ? TIOCM_DTR : 0)
            | ((status & MSVR_CD)  ? TIOCM_CAR : 0)
            | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
            | ((status & MSVR_CTS) ? TIOCM_CTS : 0);

#ifdef AURORA_DEBUG
      printk("aurora_get_modem_info: end\n");
#endif
      return result;
}

static int aurora_tiocmset(struct tty_struct *tty, struct file *file,
                     unsigned int set, unsigned int clear)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      unsigned int arg;
      unsigned long flags;
      struct Aurora_board *bp = port_Board(port);
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_set_modem_info: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, __FUNCTION__))
            return -ENODEV;

      chip = AURORA_CD180(port_No(port));

      save_flags(flags); cli();
      if (set & TIOCM_RTS)
            port->MSVR |= bp->RTS;
      if (set & TIOCM_DTR)
            port->MSVR |= bp->DTR;
      if (clear & TIOCM_RTS)
            port->MSVR &= ~bp->RTS;
      if (clear & TIOCM_DTR)
            port->MSVR &= ~bp->DTR;

      sbus_writeb(port_No(port) & 7, &bp->r[chip]->r[CD180_CAR]);
      udelay(1);

      sbus_writeb(port->MSVR, &bp->r[chip]->r[CD180_MSVR]);

      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_set_modem_info: end\n");
#endif
      return 0;
}

static void aurora_send_break(struct Aurora_port * port, unsigned long length)
{
      struct Aurora_board *bp = port_Board(port);
      unsigned long flags;
      unsigned char chip;
      
#ifdef AURORA_DEBUG
      printk("aurora_send_break: start\n");
#endif
      chip = AURORA_CD180(port_No(port));
      
      save_flags(flags); cli();

      port->break_length = AURORA_TPS / HZ * length;
      port->COR2 |= COR2_ETC;
      port->SRER  |= SRER_TXRDY;
      sbus_writeb(port_No(port) & 7, &bp->r[chip]->r[CD180_CAR]);
      udelay(1);

      sbus_writeb(port->COR2, &bp->r[chip]->r[CD180_COR2]);
      sbus_writeb(port->SRER, &bp->r[chip]->r[CD180_SRER]);
      aurora_wait_CCR(bp->r[chip]);

      sbus_writeb(CCR_CORCHG2, &bp->r[chip]->r[CD180_CCR]);
      aurora_wait_CCR(bp->r[chip]);

      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_send_break: end\n");
#endif
}

static int aurora_set_serial_info(struct Aurora_port * port,
                          struct serial_struct * newinfo)
{
      struct serial_struct tmp;
      struct Aurora_board *bp = port_Board(port);
      int change_speed;
      unsigned long flags;

#ifdef AURORA_DEBUG
      printk("aurora_set_serial_info: start\n");
#endif
      if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
            return -EFAULT;
#if 0 
      if ((tmp.irq != bp->irq) ||
          (tmp.port != bp->base) ||
          (tmp.type != PORT_CIRRUS) ||
          (tmp.baud_base != (bp->oscfreq + CD180_TPC/2) / CD180_TPC) ||
          (tmp.custom_divisor != 0) ||
          (tmp.xmit_fifo_size != CD180_NFIFO) ||
          (tmp.flags & ~AURORA_LEGAL_FLAGS))
            return -EINVAL;
#endif      
      
      change_speed = ((port->flags & ASYNC_SPD_MASK) !=
                  (tmp.flags & ASYNC_SPD_MASK));
      
      if (!capable(CAP_SYS_ADMIN)) {
            if ((tmp.close_delay != port->close_delay) ||
                (tmp.closing_wait != port->closing_wait) ||
                ((tmp.flags & ~ASYNC_USR_MASK) !=
                 (port->flags & ~ASYNC_USR_MASK)))  
                  return -EPERM;
            port->flags = ((port->flags & ~ASYNC_USR_MASK) |
                         (tmp.flags & ASYNC_USR_MASK));
      } else  {
            port->flags = ((port->flags & ~ASYNC_FLAGS) |
                         (tmp.flags & ASYNC_FLAGS));
            port->close_delay = tmp.close_delay;
            port->closing_wait = tmp.closing_wait;
      }
      if (change_speed)  {
            save_flags(flags); cli();
            aurora_change_speed(bp, port);
            restore_flags(flags);
      }
#ifdef AURORA_DEBUG
      printk("aurora_set_serial_info: end\n");
#endif
      return 0;
}

extern int aurora_get_serial_info(struct Aurora_port * port,
                          struct serial_struct * retinfo)
{
      struct serial_struct tmp;
      struct Aurora_board *bp = port_Board(port);
      
#ifdef AURORA_DEBUG
      printk("aurora_get_serial_info: start\n");
#endif
      if (!access_ok(VERIFY_WRITE, (void *) retinfo, sizeof(tmp)))
            return -EFAULT;
      
      memset(&tmp, 0, sizeof(tmp));
      tmp.type = PORT_CIRRUS;
      tmp.line = port - aurora_port;
      tmp.port = 0;
      tmp.irq  = bp->irq;
      tmp.flags = port->flags;
      tmp.baud_base = (bp->oscfreq + CD180_TPC/2) / CD180_TPC;
      tmp.close_delay = port->close_delay * HZ/100;
      tmp.closing_wait = port->closing_wait * HZ/100;
      tmp.xmit_fifo_size = CD180_NFIFO;
      copy_to_user(retinfo, &tmp, sizeof(tmp));
#ifdef AURORA_DEBUG
printk("aurora_get_serial_info: end\n");
#endif
      return 0;
}

static int aurora_ioctl(struct tty_struct * tty, struct file * filp, 
                unsigned int cmd, unsigned long arg)
                
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      int retval;

#ifdef AURORA_DEBUG
      printk("aurora_ioctl: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_ioctl"))
            return -ENODEV;
      
      switch (cmd) {
      case TCSBRK:      /* SVID version: non-zero arg --> no break */
            retval = tty_check_change(tty);
            if (retval)
                  return retval;
            tty_wait_until_sent(tty, 0);
            if (!arg)
                  aurora_send_break(port, HZ/4);      /* 1/4 second */
            return 0;
      case TCSBRKP:     /* support for POSIX tcsendbreak() */
            retval = tty_check_change(tty);
            if (retval)
                  return retval;
            tty_wait_until_sent(tty, 0);
            aurora_send_break(port, arg ? arg*(HZ/10) : HZ/4);
            return 0;
      case TIOCGSOFTCAR:
            return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *)arg);
      case TIOCSSOFTCAR:
            if (get_user(arg,(unsigned long *)arg))
                  return -EFAULT;
            tty->termios->c_cflag =
                  ((tty->termios->c_cflag & ~CLOCAL) |
                   (arg ? CLOCAL : 0));
            return 0;
      case TIOCGSERIAL: 
            return aurora_get_serial_info(port, (struct serial_struct *) arg);
      case TIOCSSERIAL: 
            return aurora_set_serial_info(port, (struct serial_struct *) arg);
      default:
            return -ENOIOCTLCMD;
      };
#ifdef AURORA_DEBUG
      printk("aurora_ioctl: end\n");
#endif
      return 0;
}

static void aurora_throttle(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      unsigned long flags;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_throttle: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_throttle"))
            return;
      
      bp = port_Board(port);
      chip = AURORA_CD180(port_No(port));
      
      save_flags(flags); cli();
      port->MSVR &= ~bp->RTS;
      sbus_writeb(port_No(port) & 7, &bp->r[chip]->r[CD180_CAR]);
      udelay(1);
      if (I_IXOFF(tty))  {
            aurora_wait_CCR(bp->r[chip]);
            sbus_writeb(CCR_SSCH2, &bp->r[chip]->r[CD180_CCR]);
            aurora_wait_CCR(bp->r[chip]);
      }
      sbus_writeb(port->MSVR, &bp->r[chip]->r[CD180_MSVR]);
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_throttle: end\n");
#endif
}

static void aurora_unthrottle(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      unsigned long flags;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_unthrottle: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_unthrottle"))
            return;
      
      bp = port_Board(port);
      
      chip = AURORA_CD180(port_No(port));
      
      save_flags(flags); cli();
      port->MSVR |= bp->RTS;
      sbus_writeb(port_No(port) & 7,
                &bp->r[chip]->r[CD180_CAR]);
      udelay(1);
      if (I_IXOFF(tty))  {
            aurora_wait_CCR(bp->r[chip]);
            sbus_writeb(CCR_SSCH1,
                      &bp->r[chip]->r[CD180_CCR]);
            aurora_wait_CCR(bp->r[chip]);
      }
      sbus_writeb(port->MSVR, &bp->r[chip]->r[CD180_MSVR]);
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_unthrottle: end\n");
#endif
}

static void aurora_stop(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      unsigned long flags;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_stop: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_stop"))
            return;
      
      bp = port_Board(port);
      
      chip = AURORA_CD180(port_No(port));
      
      save_flags(flags); cli();
      port->SRER &= ~SRER_TXRDY;
      sbus_writeb(port_No(port) & 7,
                &bp->r[chip]->r[CD180_CAR]);
      udelay(1);
      sbus_writeb(port->SRER,
                &bp->r[chip]->r[CD180_SRER]);
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_stop: end\n");
#endif
}

static void aurora_start(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
      unsigned long flags;
      unsigned char chip;

#ifdef AURORA_DEBUG
      printk("aurora_start: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_start"))
            return;
      
      bp = port_Board(port);
      
      chip = AURORA_CD180(port_No(port));
      
      save_flags(flags); cli();
      if (port->xmit_cnt && port->xmit_buf && !(port->SRER & SRER_TXRDY))  {
            port->SRER |= SRER_TXRDY;
            sbus_writeb(port_No(port) & 7,
                      &bp->r[chip]->r[CD180_CAR]);
            udelay(1);
            sbus_writeb(port->SRER,
                      &bp->r[chip]->r[CD180_SRER]);
      }
      restore_flags(flags);
#ifdef AURORA_DEBUG
      printk("aurora_start: end\n");
#endif
}

/*
 * 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_aurora_hangup() -> tty->hangup() -> aurora_hangup()
 * 
 */
static void do_aurora_hangup(void *private_)
{
      struct Aurora_port      *port = (struct Aurora_port *) private_;
      struct tty_struct *tty;

#ifdef AURORA_DEBUG
      printk("do_aurora_hangup: start\n");
#endif
      tty = port->tty;
      if (tty != NULL) {
            tty_hangup(tty);  /* FIXME: module removal race - AKPM */
#ifdef AURORA_DEBUG
            printk("do_aurora_hangup: end\n");
#endif
      }
}

static void aurora_hangup(struct tty_struct * tty)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      struct Aurora_board *bp;
                        
#ifdef AURORA_DEBUG
      printk("aurora_hangup: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_hangup"))
            return;
      
      bp = port_Board(port);
      
      aurora_shutdown_port(bp, port);
      port->event = 0;
      port->count = 0;
      port->flags &= ~ASYNC_NORMAL_ACTIVE;
      port->tty = 0;
      wake_up_interruptible(&port->open_wait);
#ifdef AURORA_DEBUG
      printk("aurora_hangup: end\n");
#endif
}

static void aurora_set_termios(struct tty_struct * tty, struct termios * old_termios)
{
      struct Aurora_port *port = (struct Aurora_port *) tty->driver_data;
      unsigned long flags;

#ifdef AURORA_DEBUG
      printk("aurora_set_termios: start\n");
#endif
      if ((aurora_paranoia_check(port, tty->name, "aurora_set_termios"))
            return;
      
      if (tty->termios->c_cflag == old_termios->c_cflag &&
          tty->termios->c_iflag == old_termios->c_iflag)
            return;

      save_flags(flags); cli();
      aurora_change_speed(port_Board(port), port);
      restore_flags(flags);

      if ((old_termios->c_cflag & CRTSCTS) &&
          !(tty->termios->c_cflag & CRTSCTS)) {
            tty->hw_stopped = 0;
            aurora_start(tty);
      }
#ifdef AURORA_DEBUG
      printk("aurora_set_termios: end\n");
#endif
}

static void do_aurora_bh(void)
{
       run_task_queue(&tq_aurora);
}

static void do_softint(void *private_)
{
      struct Aurora_port      *port = (struct Aurora_port *) private_;
      struct tty_struct *tty;

#ifdef AURORA_DEBUG
      printk("do_softint: start\n");
#endif
      tty = port->tty;
      if (tty == NULL)
            return;

      if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) {
            tty_wakeup(tty);
      }
#ifdef AURORA_DEBUG
      printk("do_softint: end\n");
#endif
}

static struct tty_operations aurora_ops = {
      .open  = aurora_open,
      .close = aurora_close,
      .write = aurora_write,
      .put_char = aurora_put_char,
      .flush_chars = aurora_flush_chars,
      .write_room = aurora_write_room,
      .chars_in_buffer = aurora_chars_in_buffer,
      .flush_buffer = aurora_flush_buffer,
      .ioctl = aurora_ioctl,
      .throttle = aurora_throttle,
      .unthrottle = aurora_unthrottle,
      .set_termios = aurora_set_termios,
      .stop = aurora_stop,
      .start = aurora_start,
      .hangup = aurora_hangup,
      .tiocmget = aurora_tiocmget,
      .tiocmset = aurora_tiocmset,
};

static int aurora_init_drivers(void)
{
      int error;
      int i;

#ifdef AURORA_DEBUG
      printk("aurora_init_drivers: start\n");
#endif
      tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
      if (tmp_buf == NULL) {
            printk(KERN_ERR "aurora: Couldn't get free page.\n");
            return 1;
      }
      init_bh(AURORA_BH, do_aurora_bh);
      aurora_driver = alloc_tty_driver(AURORA_INPORTS);
      if (!aurora_driver) {
            printk(KERN_ERR "aurora: Couldn't allocate tty driver.\n");
            free_page((unsigned long) tmp_buf);
            return 1;
      }
      aurora_driver->owner = THIS_MODULE;
      aurora_driver->name = "ttyA";
      aurora_driver->major = AURORA_MAJOR;
      aurora_driver->type = TTY_DRIVER_TYPE_SERIAL;
      aurora_driver->subtype = SERIAL_TYPE_NORMAL;
      aurora_driver->init_termios = tty_std_termios;
      aurora_driver->init_termios.c_cflag =
            B9600 | CS8 | CREAD | HUPCL | CLOCAL;
      aurora_driver->flags = TTY_DRIVER_REAL_RAW;
      tty_set_operations(aurora_driver, &aurora_ops);
      error = tty_register_driver(aurora_driver);
      if (error) {
            put_tty_driver(aurora_driver);
            free_page((unsigned long) tmp_buf);
            printk(KERN_ERR "aurora: Couldn't register aurora driver, error = %d\n",
                   error);
            return 1;
      }
      
      memset(aurora_port, 0, sizeof(aurora_port));
      for (i = 0; i < AURORA_TNPORTS; i++)  {
            aurora_port[i].magic = AURORA_MAGIC;
            aurora_port[i].tqueue.routine = do_softint;
            aurora_port[i].tqueue.data = &aurora_port[i];
            aurora_port[i].tqueue_hangup.routine = do_aurora_hangup;
            aurora_port[i].tqueue_hangup.data = &aurora_port[i];
            aurora_port[i].close_delay = 50 * HZ/100;
            aurora_port[i].closing_wait = 3000 * HZ/100;
            init_waitqueue_head(&aurora_port[i].open_wait);
            init_waitqueue_head(&aurora_port[i].close_wait);
      }
#ifdef AURORA_DEBUG
      printk("aurora_init_drivers: end\n");
#endif
      return 0;
}

static void aurora_release_drivers(void)
{
#ifdef AURORA_DEBUG
      printk("aurora_release_drivers: start\n");
#endif
      free_page((unsigned long)tmp_buf);
      tty_unregister_driver(aurora_driver);
      put_tty_driver(aurora_driver);
#ifdef AURORA_DEBUG
      printk("aurora_release_drivers: end\n");
#endif
}

/*
 * Called at boot time.
 *
 * You can specify IO base for up to RC_NBOARD cards,
 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
 * Note that there will be no probing at default
 * addresses in this case.
 *
 */
void __init aurora_setup(char *str, int *ints)
{
      int i;

      for(i=0;(i<ints[0])&&(i<4);i++) {
            if (ints[i+1]) irqs[i]=ints[i+1];
            }
}

static int __init aurora_real_init(void)
{
      int found;
      int i;

      printk(KERN_INFO "aurora: Driver starting.\n");
      if(aurora_init_drivers())
            return -EIO;
      found = aurora_probe();
      if(!found) {
            aurora_release_drivers();
            printk(KERN_INFO "aurora: No Aurora Multiport boards detected.\n");
            return -EIO;
      } else {
            printk(KERN_INFO "aurora: %d boards found.\n", found);
      }
      for (i = 0; i < found; i++) {
            int ret = aurora_setup_board(&aurora_board[i]);

            if (ret) {
#ifdef AURORA_DEBUG
                  printk(KERN_ERR "aurora_init: error aurora_setup_board ret %d\n",
                         ret);
#endif
                  return ret;
            }
      }
      return 0;
}

int irq  = 0;
int irq1 = 0;
int irq2 = 0;
int irq3 = 0;
module_param(irq , int, 0);
module_param(irq1, int, 0);
module_param(irq2, int, 0);
module_param(irq3, int, 0);

static int __init aurora_init(void) 
{
      if (irq ) irqs[0]=irq ;
      if (irq1) irqs[1]=irq1;
      if (irq2) irqs[2]=irq2;
      if (irq3) irqs[3]=irq3;
      return aurora_real_init();
}
      
static void __exit aurora_cleanup(void)
{
      int i;
      
#ifdef AURORA_DEBUG
printk("cleanup_module: aurora_release_drivers\n");
#endif

      aurora_release_drivers();
      for (i = 0; i < AURORA_NBOARD; i++)
            if (aurora_board[i].flags & AURORA_BOARD_PRESENT) {
                  aurora_shutdown_board(&aurora_board[i]);
                  aurora_release_io_range(&aurora_board[i]);
            }
}

module_init(aurora_init);
module_exit(aurora_cleanup);
MODULE_LICENSE("GPL");

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