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sdla.c

/*
 * SDLA           An implementation of a driver for the Sangoma S502/S508 series
 *          multi-protocol PC interface card.  Initial offering is with 
 *          the DLCI driver, providing Frame Relay support for linux.
 *
 *          Global definitions for the Frame relay interface.
 *
 * Version: @(#)sdla.c   0.30 12 Sep 1996
 *
 * Credits: Sangoma Technologies, for the use of 2 cards for an extended
 *                period of time.
 *          David Mandelstam <dm@sangoma.com> for getting me started on 
 *                this project, and incentive to complete it.
 *          Gene Kozen <74604.152@compuserve.com> for providing me with
 *                important information about the cards.
 *
 * Author:  Mike McLagan <mike.mclagan@linux.org>
 *
 * Changes:
 *          0.15  Mike McLagan      Improved error handling, packet dropping
 *          0.20  Mike McLagan      New transmit/receive flags for config
 *                            If in FR mode, don't accept packets from
 *                            non DLCI devices.
 *          0.25  Mike McLagan      Fixed problem with rejecting packets
 *                            from non DLCI devices.
 *          0.30  Mike McLagan      Fixed kernel panic when used with modified
 *                            ifconfig
 *
 *          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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_frad.h>
#include <linux/sdla.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>

static const char* version = "SDLA driver v0.30, 12 Sep 1996, mike.mclagan@linux.org";

static unsigned int valid_port[] = { 0x250, 0x270, 0x280, 0x300, 0x350, 0x360, 0x380, 0x390};

static unsigned int valid_mem[] = {
                            0xA0000, 0xA2000, 0xA4000, 0xA6000, 0xA8000, 0xAA000, 0xAC000, 0xAE000, 
                                    0xB0000, 0xB2000, 0xB4000, 0xB6000, 0xB8000, 0xBA000, 0xBC000, 0xBE000,
                                    0xC0000, 0xC2000, 0xC4000, 0xC6000, 0xC8000, 0xCA000, 0xCC000, 0xCE000,
                                    0xD0000, 0xD2000, 0xD4000, 0xD6000, 0xD8000, 0xDA000, 0xDC000, 0xDE000,
                                    0xE0000, 0xE2000, 0xE4000, 0xE6000, 0xE8000, 0xEA000, 0xEC000, 0xEE000}; 

static DEFINE_SPINLOCK(sdla_lock);

/*********************************************************
 *
 * these are the core routines that access the card itself 
 *
 *********************************************************/

#define SDLA_WINDOW(dev,addr) outb((((addr) >> 13) & 0x1F), (dev)->base_addr + SDLA_REG_Z80_WINDOW)

static void __sdla_read(struct net_device *dev, int addr, void *buf, short len)
{
      char          *temp;
      const void    *base;
      int           offset, bytes;

      temp = buf;
      while(len)
      {     
            offset = addr & SDLA_ADDR_MASK;
            bytes = offset + len > SDLA_WINDOW_SIZE ? SDLA_WINDOW_SIZE - offset : len;
            base = (const void *) (dev->mem_start + offset);

            SDLA_WINDOW(dev, addr);
            memcpy(temp, base, bytes);

            addr += bytes;
            temp += bytes;
            len  -= bytes;
      }  
}

static void sdla_read(struct net_device *dev, int addr, void *buf, short len)
{
      unsigned long flags;
      spin_lock_irqsave(&sdla_lock, flags);
      __sdla_read(dev, addr, buf, len);
      spin_unlock_irqrestore(&sdla_lock, flags);
}

static void __sdla_write(struct net_device *dev, int addr, 
                   const void *buf, short len)
{
      const char    *temp;
      void        *base;
      int           offset, bytes;

      temp = buf;
      while(len)
      {
            offset = addr & SDLA_ADDR_MASK;
            bytes = offset + len > SDLA_WINDOW_SIZE ? SDLA_WINDOW_SIZE - offset : len;
            base = (void *) (dev->mem_start + offset);

            SDLA_WINDOW(dev, addr);
            memcpy(base, temp, bytes);

            addr += bytes;
            temp += bytes;
            len  -= bytes;
      }
}

static void sdla_write(struct net_device *dev, int addr, 
                   const void *buf, short len)
{
      unsigned long flags;

      spin_lock_irqsave(&sdla_lock, flags);
      __sdla_write(dev, addr, buf, len);
      spin_unlock_irqrestore(&sdla_lock, flags);
}


static void sdla_clear(struct net_device *dev)
{
      unsigned long flags;
      char          *base;
      int           len, addr, bytes;

      len = 65536;      
      addr = 0;
      bytes = SDLA_WINDOW_SIZE;
      base = (void *) dev->mem_start;

      spin_lock_irqsave(&sdla_lock, flags);
      while(len)
      {
            SDLA_WINDOW(dev, addr);
            memset(base, 0, bytes);

            addr += bytes;
            len  -= bytes;
      }
      spin_unlock_irqrestore(&sdla_lock, flags);

}

static char sdla_byte(struct net_device *dev, int addr)
{
      unsigned long flags;
      char          byte, *temp;

      temp = (void *) (dev->mem_start + (addr & SDLA_ADDR_MASK));

      spin_lock_irqsave(&sdla_lock, flags);
      SDLA_WINDOW(dev, addr);
      byte = *temp;
      spin_unlock_irqrestore(&sdla_lock, flags);

      return(byte);
}

static void sdla_stop(struct net_device *dev)
{
      struct frad_local *flp;

      flp = dev->priv;
      switch(flp->type)
      {
            case SDLA_S502A:
                  outb(SDLA_S502A_HALT, dev->base_addr + SDLA_REG_CONTROL);
                  flp->state = SDLA_HALT;
                  break;
            case SDLA_S502E:
                  outb(SDLA_HALT, dev->base_addr + SDLA_REG_Z80_CONTROL);
                  outb(SDLA_S502E_ENABLE, dev->base_addr + SDLA_REG_CONTROL);
                  flp->state = SDLA_S502E_ENABLE;
                  break;
            case SDLA_S507:
                  flp->state &= ~SDLA_CPUEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;
            case SDLA_S508:
                  flp->state &= ~SDLA_CPUEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;
      }
}

static void sdla_start(struct net_device *dev)
{
      struct frad_local *flp;

      flp = dev->priv;
      switch(flp->type)
      {
            case SDLA_S502A:
                  outb(SDLA_S502A_NMI, dev->base_addr + SDLA_REG_CONTROL);
                  outb(SDLA_S502A_START, dev->base_addr + SDLA_REG_CONTROL);
                  flp->state = SDLA_S502A_START;
                  break;
            case SDLA_S502E:
                  outb(SDLA_S502E_CPUEN, dev->base_addr + SDLA_REG_Z80_CONTROL);
                  outb(0x00, dev->base_addr + SDLA_REG_CONTROL);
                  flp->state = 0;
                  break;
            case SDLA_S507:
                  flp->state |= SDLA_CPUEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;
            case SDLA_S508:
                  flp->state |= SDLA_CPUEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;
      }
}

/****************************************************
 *
 * this is used for the S502A/E cards to determine
 * the speed of the onboard CPU.  Calibration is
 * necessary for the Frame Relay code uploaded 
 * later.  Incorrect results cause timing problems
 * with link checks & status messages
 *
 ***************************************************/

static int sdla_z80_poll(struct net_device *dev, int z80_addr, int jiffs, char resp1, char resp2)
{
      unsigned long start, done, now;
      char          resp, *temp;

      start = now = jiffies;
      done = jiffies + jiffs;

      temp = (void *)dev->mem_start;
      temp += z80_addr & SDLA_ADDR_MASK;
      
      resp = ~resp1;
      while (time_before(jiffies, done) && (resp != resp1) && (!resp2 || (resp != resp2)))
      {
            if (jiffies != now)
            {
                  SDLA_WINDOW(dev, z80_addr);
                  now = jiffies;
                  resp = *temp;
            }
      }
      return(time_before(jiffies, done) ? jiffies - start : -1);
}

/* constants for Z80 CPU speed */
#define Z80_READY             '1'   /* Z80 is ready to begin */
#define LOADER_READY          '2'   /* driver is ready to begin */
#define Z80_SCC_OK            '3'   /* SCC is on board */
#define Z80_SCC_BAD           '4'   /* SCC was not found */

static int sdla_cpuspeed(struct net_device *dev, struct ifreq *ifr)
{
      int  jiffs;
      char data;

      sdla_start(dev);
      if (sdla_z80_poll(dev, 0, 3*HZ, Z80_READY, 0) < 0)
            return(-EIO);

      data = LOADER_READY;
      sdla_write(dev, 0, &data, 1);

      if ((jiffs = sdla_z80_poll(dev, 0, 8*HZ, Z80_SCC_OK, Z80_SCC_BAD)) < 0)
            return(-EIO);

      sdla_stop(dev);
      sdla_read(dev, 0, &data, 1);

      if (data == Z80_SCC_BAD)
      {
            printk("%s: SCC bad\n", dev->name);
            return(-EIO);
      }

      if (data != Z80_SCC_OK)
            return(-EINVAL);

      if (jiffs < 165)
            ifr->ifr_mtu = SDLA_CPU_16M;
      else if (jiffs < 220)
            ifr->ifr_mtu = SDLA_CPU_10M;
      else if (jiffs < 258)
            ifr->ifr_mtu = SDLA_CPU_8M;
      else if (jiffs < 357)
            ifr->ifr_mtu = SDLA_CPU_7M;
      else if (jiffs < 467)
            ifr->ifr_mtu = SDLA_CPU_5M;
      else
            ifr->ifr_mtu = SDLA_CPU_3M;
 
      return(0);
}

/************************************************
 *
 *  Direct interaction with the Frame Relay code 
 *  starts here.
 *
 ************************************************/

struct _dlci_stat 
{
      short dlci;
      char  flags;
} __attribute__((packed));

struct _frad_stat 
{
      char    flags;
      struct _dlci_stat dlcis[SDLA_MAX_DLCI];
};

static void sdla_errors(struct net_device *dev, int cmd, int dlci, int ret, int len, void *data) 
{
      struct _dlci_stat *pstatus;
      short             *pdlci;
      int               i;
      char              *state, line[30];

      switch (ret)
      {
            case SDLA_RET_MODEM:
                  state = data;
                  if (*state & SDLA_MODEM_DCD_LOW)
                        printk(KERN_INFO "%s: Modem DCD unexpectedly low!\n", dev->name);
                  if (*state & SDLA_MODEM_CTS_LOW)
                        printk(KERN_INFO "%s: Modem CTS unexpectedly low!\n", dev->name);
                  /* I should probably do something about this! */
                  break;

            case SDLA_RET_CHANNEL_OFF:
                  printk(KERN_INFO "%s: Channel became inoperative!\n", dev->name);
                  /* same here */
                  break;

            case SDLA_RET_CHANNEL_ON:
                  printk(KERN_INFO "%s: Channel became operative!\n", dev->name);
                  /* same here */
                  break;

            case SDLA_RET_DLCI_STATUS:
                  printk(KERN_INFO "%s: Status change reported by Access Node.\n", dev->name);
                  len /= sizeof(struct _dlci_stat);
                  for(pstatus = data, i=0;i < len;i++,pstatus++)
                  {
                        if (pstatus->flags & SDLA_DLCI_NEW)
                              state = "new";
                        else if (pstatus->flags & SDLA_DLCI_DELETED)
                              state = "deleted";
                        else if (pstatus->flags & SDLA_DLCI_ACTIVE)
                              state = "active";
                        else
                        {
                              sprintf(line, "unknown status: %02X", pstatus->flags);
                              state = line;
                        }
                        printk(KERN_INFO "%s: DLCI %i: %s.\n", dev->name, pstatus->dlci, state);
                        /* same here */
                  }
                  break;

            case SDLA_RET_DLCI_UNKNOWN:
                  printk(KERN_INFO "%s: Received unknown DLCIs:", dev->name);
                  len /= sizeof(short);
                  for(pdlci = data,i=0;i < len;i++,pdlci++)
                        printk(" %i", *pdlci);
                  printk("\n");
                  break;

            case SDLA_RET_TIMEOUT:
                  printk(KERN_ERR "%s: Command timed out!\n", dev->name);
                  break;

            case SDLA_RET_BUF_OVERSIZE:
                  printk(KERN_INFO "%s: Bc/CIR overflow, acceptable size is %i\n", dev->name, len);
                  break;

            case SDLA_RET_BUF_TOO_BIG:
                  printk(KERN_INFO "%s: Buffer size over specified max of %i\n", dev->name, len);
                  break;

            case SDLA_RET_CHANNEL_INACTIVE:
            case SDLA_RET_DLCI_INACTIVE:
            case SDLA_RET_CIR_OVERFLOW:
            case SDLA_RET_NO_BUFS:
                  if (cmd == SDLA_INFORMATION_WRITE)
                        break;

            default: 
                  printk(KERN_DEBUG "%s: Cmd 0x%2.2X generated return code 0x%2.2X\n", dev->name, cmd, ret);
                  /* Further processing could be done here */
                  break;
      }
}

static int sdla_cmd(struct net_device *dev, int cmd, short dlci, short flags, 
                        void *inbuf, short inlen, void *outbuf, short *outlen)
{
      static struct _frad_stat status;
      struct frad_local        *flp;
      struct sdla_cmd          *cmd_buf;
      unsigned long            pflags;
      unsigned long            jiffs;
      int                      ret, waiting, len;
      long                     window;

      flp = dev->priv;
      window = flp->type == SDLA_S508 ? SDLA_508_CMD_BUF : SDLA_502_CMD_BUF;
      cmd_buf = (struct sdla_cmd *)(dev->mem_start + (window & SDLA_ADDR_MASK));
      ret = 0;
      len = 0;
      jiffs = jiffies + HZ;  /* 1 second is plenty */

      spin_lock_irqsave(&sdla_lock, pflags);
      SDLA_WINDOW(dev, window);
      cmd_buf->cmd = cmd;
      cmd_buf->dlci = dlci;
      cmd_buf->flags = flags;

      if (inbuf)
            memcpy(cmd_buf->data, inbuf, inlen);

      cmd_buf->length = inlen;

      cmd_buf->opp_flag = 1;
      spin_unlock_irqrestore(&sdla_lock, pflags);

      waiting = 1;
      len = 0;
      while (waiting && time_before_eq(jiffies, jiffs))
      {
            if (waiting++ % 3) 
            {
                  spin_lock_irqsave(&sdla_lock, pflags);
                  SDLA_WINDOW(dev, window);
                  waiting = ((volatile int)(cmd_buf->opp_flag));
                  spin_unlock_irqrestore(&sdla_lock, pflags);
            }
      }
      
      if (!waiting)
      {

            spin_lock_irqsave(&sdla_lock, pflags);
            SDLA_WINDOW(dev, window);
            ret = cmd_buf->retval;
            len = cmd_buf->length;
            if (outbuf && outlen)
            {
                  *outlen = *outlen >= len ? len : *outlen;

                  if (*outlen)
                        memcpy(outbuf, cmd_buf->data, *outlen);
            }

            /* This is a local copy that's used for error handling */
            if (ret)
                  memcpy(&status, cmd_buf->data, len > sizeof(status) ? sizeof(status) : len);

            spin_unlock_irqrestore(&sdla_lock, pflags);
      }
      else
            ret = SDLA_RET_TIMEOUT;

      if (ret != SDLA_RET_OK)
            sdla_errors(dev, cmd, dlci, ret, len, &status);

      return(ret);
}

/***********************************************
 *
 * these functions are called by the DLCI driver 
 *
 ***********************************************/

static int sdla_reconfig(struct net_device *dev);

static int sdla_activate(struct net_device *slave, struct net_device *master)
{
      struct frad_local *flp;
      int i;

      flp = slave->priv;

      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->master[i] == master)
                  break;

      if (i == CONFIG_DLCI_MAX)
            return(-ENODEV);

      flp->dlci[i] = abs(flp->dlci[i]);

      if (netif_running(slave) && (flp->config.station == FRAD_STATION_NODE))
            sdla_cmd(slave, SDLA_ACTIVATE_DLCI, 0, 0, &flp->dlci[i], sizeof(short), NULL, NULL);

      return(0);
}

static int sdla_deactivate(struct net_device *slave, struct net_device *master)
{
      struct frad_local *flp;
      int               i;

      flp = slave->priv;

      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->master[i] == master)
                  break;

      if (i == CONFIG_DLCI_MAX)
            return(-ENODEV);

      flp->dlci[i] = -abs(flp->dlci[i]);

      if (netif_running(slave) && (flp->config.station == FRAD_STATION_NODE))
            sdla_cmd(slave, SDLA_DEACTIVATE_DLCI, 0, 0, &flp->dlci[i], sizeof(short), NULL, NULL);

      return(0);
}

static int sdla_assoc(struct net_device *slave, struct net_device *master)
{
      struct frad_local *flp;
      int               i;

      if (master->type != ARPHRD_DLCI)
            return(-EINVAL);

      flp = slave->priv;

      for(i=0;i<CONFIG_DLCI_MAX;i++)
      {
            if (!flp->master[i])
                  break;
            if (abs(flp->dlci[i]) == *(short *)(master->dev_addr))
                  return(-EADDRINUSE);
      } 

      if (i == CONFIG_DLCI_MAX)
            return(-EMLINK);  /* #### Alan: Comments on this ?? */


      flp->master[i] = master;
      flp->dlci[i] = -*(short *)(master->dev_addr);
      master->mtu = slave->mtu;

      if (netif_running(slave)) {
            if (flp->config.station == FRAD_STATION_CPE)
                  sdla_reconfig(slave);
            else
                  sdla_cmd(slave, SDLA_ADD_DLCI, 0, 0, master->dev_addr, sizeof(short), NULL, NULL);
      }

      return(0);
}

static int sdla_deassoc(struct net_device *slave, struct net_device *master)
{
      struct frad_local *flp;
      int               i;

      flp = slave->priv;

      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->master[i] == master)
                  break;

      if (i == CONFIG_DLCI_MAX)
            return(-ENODEV);

      flp->master[i] = NULL;
      flp->dlci[i] = 0;


      if (netif_running(slave)) {
            if (flp->config.station == FRAD_STATION_CPE)
                  sdla_reconfig(slave);
            else
                  sdla_cmd(slave, SDLA_DELETE_DLCI, 0, 0, master->dev_addr, sizeof(short), NULL, NULL);
      }

      return(0);
}

static int sdla_dlci_conf(struct net_device *slave, struct net_device *master, int get)
{
      struct frad_local *flp;
      struct dlci_local *dlp;
      int               i;
      short             len, ret;

      flp = slave->priv;

      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->master[i] == master)
                  break;

      if (i == CONFIG_DLCI_MAX)
            return(-ENODEV);

      dlp = master->priv;

      ret = SDLA_RET_OK;
      len = sizeof(struct dlci_conf);
      if (netif_running(slave)) {
            if (get)
                  ret = sdla_cmd(slave, SDLA_READ_DLCI_CONFIGURATION, abs(flp->dlci[i]), 0,  
                              NULL, 0, &dlp->config, &len);
            else
                  ret = sdla_cmd(slave, SDLA_SET_DLCI_CONFIGURATION, abs(flp->dlci[i]), 0,  
                              &dlp->config, sizeof(struct dlci_conf) - 4 * sizeof(short), NULL, NULL);
      }

      return(ret == SDLA_RET_OK ? 0 : -EIO);
}

/**************************
 *
 * now for the Linux driver 
 *
 **************************/

/* NOTE: the DLCI driver deals with freeing the SKB!! */
static int sdla_transmit(struct sk_buff *skb, struct net_device *dev)
{
      struct frad_local *flp;
      int               ret, addr, accept, i;
      short             size;
      unsigned long     flags;
      struct buf_entry  *pbuf;

      flp = dev->priv;
      ret = 0;
      accept = 1;

      netif_stop_queue(dev);

      /*
       * stupid GateD insists on setting up the multicast router thru us
       * and we're ill equipped to handle a non Frame Relay packet at this
       * time!
       */

      accept = 1;
      switch (dev->type)
      {
            case ARPHRD_FRAD:
                  if (skb->dev->type != ARPHRD_DLCI)
                  {
                        printk(KERN_WARNING "%s: Non DLCI device, type %i, tried to send on FRAD module.\n", dev->name, skb->dev->type);
                        accept = 0;
                  }
                  break;
            default:
                  printk(KERN_WARNING "%s: unknown firmware type 0x%4.4X\n", dev->name, dev->type);
                  accept = 0;
                  break;
      }
      if (accept)
      {
            /* this is frame specific, but till there's a PPP module, it's the default */
            switch (flp->type)
            {
                  case SDLA_S502A:
                  case SDLA_S502E:
                        ret = sdla_cmd(dev, SDLA_INFORMATION_WRITE, *(short *)(skb->dev->dev_addr), 0, skb->data, skb->len, NULL, NULL);
                        break;
                        case SDLA_S508:
                        size = sizeof(addr);
                        ret = sdla_cmd(dev, SDLA_INFORMATION_WRITE, *(short *)(skb->dev->dev_addr), 0, NULL, skb->len, &addr, &size);
                        if (ret == SDLA_RET_OK)
                        {

                              spin_lock_irqsave(&sdla_lock, flags);
                              SDLA_WINDOW(dev, addr);
                              pbuf = (void *)(((int) dev->mem_start) + (addr & SDLA_ADDR_MASK));
                              __sdla_write(dev, pbuf->buf_addr, skb->data, skb->len);
                              SDLA_WINDOW(dev, addr);
                              pbuf->opp_flag = 1;
                              spin_unlock_irqrestore(&sdla_lock, flags);
                        }
                        break;
            }
            switch (ret)
            {
                  case SDLA_RET_OK:
                        flp->stats.tx_packets++;
                        ret = DLCI_RET_OK;
                        break;

                  case SDLA_RET_CIR_OVERFLOW:
                  case SDLA_RET_BUF_OVERSIZE:
                  case SDLA_RET_NO_BUFS:
                        flp->stats.tx_dropped++;
                        ret = DLCI_RET_DROP;
                        break;

                  default:
                        flp->stats.tx_errors++;
                        ret = DLCI_RET_ERR;
                        break;
            }
      }
      netif_wake_queue(dev);
      for(i=0;i<CONFIG_DLCI_MAX;i++)
      {
            if(flp->master[i]!=NULL)
                  netif_wake_queue(flp->master[i]);
      }           
      return(ret);
}

static void sdla_receive(struct net_device *dev)
{
      struct net_device   *master;
      struct frad_local *flp;
      struct dlci_local *dlp;
      struct sk_buff     *skb;

      struct sdla_cmd   *cmd;
      struct buf_info   *pbufi;
      struct buf_entry  *pbuf;

      unsigned long       flags;
      int               i=0, received, success, addr, buf_base, buf_top;
      short             dlci, len, len2, split;

      flp = dev->priv;
      success = 1;
      received = addr = buf_top = buf_base = 0;
      len = dlci = 0;
      skb = NULL;
      master = NULL;
      cmd = NULL;
      pbufi = NULL;
      pbuf = NULL;

      spin_lock_irqsave(&sdla_lock, flags);

      switch (flp->type)
      {
            case SDLA_S502A:
            case SDLA_S502E:
                  cmd = (void *) (dev->mem_start + (SDLA_502_RCV_BUF & SDLA_ADDR_MASK));
                  SDLA_WINDOW(dev, SDLA_502_RCV_BUF);
                  success = cmd->opp_flag;
                  if (!success)
                        break;

                  dlci = cmd->dlci;
                  len = cmd->length;
                  break;

            case SDLA_S508:
                  pbufi = (void *) (dev->mem_start + (SDLA_508_RXBUF_INFO & SDLA_ADDR_MASK));
                  SDLA_WINDOW(dev, SDLA_508_RXBUF_INFO);
                  pbuf = (void *) (dev->mem_start + ((pbufi->rse_base + flp->buffer * sizeof(struct buf_entry)) & SDLA_ADDR_MASK));
                  success = pbuf->opp_flag;
                  if (!success)
                        break;

                  buf_top = pbufi->buf_top;
                  buf_base = pbufi->buf_base;
                  dlci = pbuf->dlci;
                  len = pbuf->length;
                  addr = pbuf->buf_addr;
                  break;
      }

      /* common code, find the DLCI and get the SKB */
      if (success)
      {
            for (i=0;i<CONFIG_DLCI_MAX;i++)
                  if (flp->dlci[i] == dlci)
                        break;

            if (i == CONFIG_DLCI_MAX)
            {
                  printk(KERN_NOTICE "%s: Received packet from invalid DLCI %i, ignoring.", dev->name, dlci);
                  flp->stats.rx_errors++;
                  success = 0;
            }
      }

      if (success)
      {
            master = flp->master[i];
            skb = dev_alloc_skb(len + sizeof(struct frhdr));
            if (skb == NULL) 
            {
                  printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
                  flp->stats.rx_dropped++; 
                  success = 0;
            }
            else
                  skb_reserve(skb, sizeof(struct frhdr));
      }

      /* pick up the data */
      switch (flp->type)
      {
            case SDLA_S502A:
            case SDLA_S502E:
                  if (success)
                        __sdla_read(dev, SDLA_502_RCV_BUF + SDLA_502_DATA_OFS, skb_put(skb,len), len);

                  SDLA_WINDOW(dev, SDLA_502_RCV_BUF);
                  cmd->opp_flag = 0;
                  break;

            case SDLA_S508:
                  if (success)
                  {
                        /* is this buffer split off the end of the internal ring buffer */
                        split = addr + len > buf_top + 1 ? len - (buf_top - addr + 1) : 0;
                        len2 = len - split;

                        __sdla_read(dev, addr, skb_put(skb, len2), len2);
                        if (split)
                              __sdla_read(dev, buf_base, skb_put(skb, split), split);
                  }

                  /* increment the buffer we're looking at */
                  SDLA_WINDOW(dev, SDLA_508_RXBUF_INFO);
                  flp->buffer = (flp->buffer + 1) % pbufi->rse_num;
                  pbuf->opp_flag = 0;
                  break;
      }

      if (success)
      {
            flp->stats.rx_packets++;
            dlp = master->priv;
            (*dlp->receive)(skb, master);
      }

      spin_unlock_irqrestore(&sdla_lock, flags);
}

static irqreturn_t sdla_isr(int irq, void *dev_id)
{
      struct net_device     *dev;
      struct frad_local *flp;
      char              byte;

      dev = dev_id;

      flp = netdev_priv(dev);

      if (!flp->initialized)
      {
            printk(KERN_WARNING "%s: irq %d for uninitialized device.\n", dev->name, irq);
            return IRQ_NONE;
      }

      byte = sdla_byte(dev, flp->type == SDLA_S508 ? SDLA_508_IRQ_INTERFACE : SDLA_502_IRQ_INTERFACE);
      switch (byte)
      {
            case SDLA_INTR_RX:
                  sdla_receive(dev);
                  break;

            /* the command will get an error return, which is processed above */
            case SDLA_INTR_MODEM:
            case SDLA_INTR_STATUS:
                  sdla_cmd(dev, SDLA_READ_DLC_STATUS, 0, 0, NULL, 0, NULL, NULL);
                  break;

            case SDLA_INTR_TX:
            case SDLA_INTR_COMPLETE:
            case SDLA_INTR_TIMER:
                  printk(KERN_WARNING "%s: invalid irq flag 0x%02X.\n", dev->name, byte);
                  break;
      }

      /* the S502E requires a manual acknowledgement of the interrupt */ 
      if (flp->type == SDLA_S502E)
      {
            flp->state &= ~SDLA_S502E_INTACK;
            outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
            flp->state |= SDLA_S502E_INTACK;
            outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
      }

      /* this clears the byte, informing the Z80 we're done */
      byte = 0;
      sdla_write(dev, flp->type == SDLA_S508 ? SDLA_508_IRQ_INTERFACE : SDLA_502_IRQ_INTERFACE, &byte, sizeof(byte));
      return IRQ_HANDLED;
}

static void sdla_poll(unsigned long device)
{
      struct net_device   *dev;
      struct frad_local *flp;

      dev = (struct net_device *) device;
      flp = dev->priv;

      if (sdla_byte(dev, SDLA_502_RCV_BUF))
            sdla_receive(dev);

      flp->timer.expires = 1;
      add_timer(&flp->timer);
}

static int sdla_close(struct net_device *dev)
{
      struct frad_local *flp;
      struct intr_info  intr;
      int               len, i;
      short             dlcis[CONFIG_DLCI_MAX];

      flp = dev->priv;

      len = 0;
      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->dlci[i])
                  dlcis[len++] = abs(flp->dlci[i]);
      len *= 2;

      if (flp->config.station == FRAD_STATION_NODE)
      {
            for(i=0;i<CONFIG_DLCI_MAX;i++)
                  if (flp->dlci[i] > 0) 
                        sdla_cmd(dev, SDLA_DEACTIVATE_DLCI, 0, 0, dlcis, len, NULL, NULL);
            sdla_cmd(dev, SDLA_DELETE_DLCI, 0, 0, &flp->dlci[i], sizeof(flp->dlci[i]), NULL, NULL);
      }

      memset(&intr, 0, sizeof(intr));
      /* let's start up the reception */
      switch(flp->type)
      {
            case SDLA_S502A:
                  del_timer(&flp->timer); 
                  break;

            case SDLA_S502E:
                  sdla_cmd(dev, SDLA_SET_IRQ_TRIGGER, 0, 0, &intr, sizeof(char) + sizeof(short), NULL, NULL);
                  flp->state &= ~SDLA_S502E_INTACK;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;

            case SDLA_S507:
                  break;

            case SDLA_S508:
                  sdla_cmd(dev, SDLA_SET_IRQ_TRIGGER, 0, 0, &intr, sizeof(struct intr_info), NULL, NULL);
                  flp->state &= ~SDLA_S508_INTEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  break;
      }

      sdla_cmd(dev, SDLA_DISABLE_COMMUNICATIONS, 0, 0, NULL, 0, NULL, NULL);

      netif_stop_queue(dev);
      
      return(0);
}

struct conf_data {
      struct frad_conf config;
      short            dlci[CONFIG_DLCI_MAX];
};

static int sdla_open(struct net_device *dev)
{
      struct frad_local *flp;
      struct dlci_local *dlp;
      struct conf_data  data;
      struct intr_info  intr;
      int               len, i;
      char              byte;

      flp = dev->priv;

      if (!flp->initialized)
            return(-EPERM);

      if (!flp->configured)
            return(-EPERM);

      /* time to send in the configuration */
      len = 0;
      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->dlci[i])
                  data.dlci[len++] = abs(flp->dlci[i]);
      len *= 2;

      memcpy(&data.config, &flp->config, sizeof(struct frad_conf));
      len += sizeof(struct frad_conf);

      sdla_cmd(dev, SDLA_DISABLE_COMMUNICATIONS, 0, 0, NULL, 0, NULL, NULL);
      sdla_cmd(dev, SDLA_SET_DLCI_CONFIGURATION, 0, 0, &data, len, NULL, NULL);

      if (flp->type == SDLA_S508)
            flp->buffer = 0;

      sdla_cmd(dev, SDLA_ENABLE_COMMUNICATIONS, 0, 0, NULL, 0, NULL, NULL);

      /* let's start up the reception */
      memset(&intr, 0, sizeof(intr));
      switch(flp->type)
      {
            case SDLA_S502A:
                  flp->timer.expires = 1;
                  add_timer(&flp->timer);
                  break;

            case SDLA_S502E:
                  flp->state |= SDLA_S502E_ENABLE;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  flp->state |= SDLA_S502E_INTACK;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  byte = 0;
                  sdla_write(dev, SDLA_502_IRQ_INTERFACE, &byte, sizeof(byte));
                  intr.flags = SDLA_INTR_RX | SDLA_INTR_STATUS | SDLA_INTR_MODEM;
                  sdla_cmd(dev, SDLA_SET_IRQ_TRIGGER, 0, 0, &intr, sizeof(char) + sizeof(short), NULL, NULL);
                  break;

            case SDLA_S507:
                  break;

            case SDLA_S508:
                  flp->state |= SDLA_S508_INTEN;
                  outb(flp->state, dev->base_addr + SDLA_REG_CONTROL);
                  byte = 0;
                  sdla_write(dev, SDLA_508_IRQ_INTERFACE, &byte, sizeof(byte));
                  intr.flags = SDLA_INTR_RX | SDLA_INTR_STATUS | SDLA_INTR_MODEM;
                  intr.irq = dev->irq;
                  sdla_cmd(dev, SDLA_SET_IRQ_TRIGGER, 0, 0, &intr, sizeof(struct intr_info), NULL, NULL);
                  break;
      }

      if (flp->config.station == FRAD_STATION_CPE)
      {
            byte = SDLA_ICS_STATUS_ENQ;
            sdla_cmd(dev, SDLA_ISSUE_IN_CHANNEL_SIGNAL, 0, 0, &byte, sizeof(byte), NULL, NULL);
      }
      else
      {
            sdla_cmd(dev, SDLA_ADD_DLCI, 0, 0, data.dlci, len - sizeof(struct frad_conf), NULL, NULL);
            for(i=0;i<CONFIG_DLCI_MAX;i++)
                  if (flp->dlci[i] > 0)
                        sdla_cmd(dev, SDLA_ACTIVATE_DLCI, 0, 0, &flp->dlci[i], 2*sizeof(flp->dlci[i]), NULL, NULL);
      }

      /* configure any specific DLCI settings */
      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->dlci[i])
            {
                  dlp = flp->master[i]->priv;
                  if (dlp->configured)
                        sdla_cmd(dev, SDLA_SET_DLCI_CONFIGURATION, abs(flp->dlci[i]), 0, &dlp->config, sizeof(struct dlci_conf), NULL, NULL);
            }

      netif_start_queue(dev);
      
      return(0);
}

static int sdla_config(struct net_device *dev, struct frad_conf __user *conf, int get)
{
      struct frad_local *flp;
      struct conf_data  data;
      int               i;
      short             size;

      if (dev->type == 0xFFFF)
            return(-EUNATCH);

      flp = dev->priv;

      if (!get)
      {
            if (netif_running(dev))
                  return(-EBUSY);

            if(copy_from_user(&data.config, conf, sizeof(struct frad_conf)))
                  return -EFAULT;

            if (data.config.station & ~FRAD_STATION_NODE)
                  return(-EINVAL);

            if (data.config.flags & ~FRAD_VALID_FLAGS)
                  return(-EINVAL);

            if ((data.config.kbaud < 0) || 
                   ((data.config.kbaud > 128) && (flp->type != SDLA_S508)))
                  return(-EINVAL);

            if (data.config.clocking & ~(FRAD_CLOCK_INT | SDLA_S508_PORT_RS232))
                  return(-EINVAL);

            if ((data.config.mtu < 0) || (data.config.mtu > SDLA_MAX_MTU))
                  return(-EINVAL);

            if ((data.config.T391 < 5) || (data.config.T391 > 30))
                  return(-EINVAL);

            if ((data.config.T392 < 5) || (data.config.T392 > 30))
                  return(-EINVAL);

            if ((data.config.N391 < 1) || (data.config.N391 > 255))
                  return(-EINVAL);

            if ((data.config.N392 < 1) || (data.config.N392 > 10))
                  return(-EINVAL);

            if ((data.config.N393 < 1) || (data.config.N393 > 10))
                  return(-EINVAL);

            memcpy(&flp->config, &data.config, sizeof(struct frad_conf));
            flp->config.flags |= SDLA_DIRECT_RECV;

            if (flp->type == SDLA_S508)
                  flp->config.flags |= SDLA_TX70_RX30;

            if (dev->mtu != flp->config.mtu)
            {
                  /* this is required to change the MTU */
                  dev->mtu = flp->config.mtu;
                  for(i=0;i<CONFIG_DLCI_MAX;i++)
                        if (flp->master[i])
                              flp->master[i]->mtu = flp->config.mtu;
            }

            flp->config.mtu += sizeof(struct frhdr);

            /* off to the races! */
            if (!flp->configured)
                  sdla_start(dev);

            flp->configured = 1;
      }
      else
      {
            /* no sense reading if the CPU isn't started */
            if (netif_running(dev))
            {
                  size = sizeof(data);
                  if (sdla_cmd(dev, SDLA_READ_DLCI_CONFIGURATION, 0, 0, NULL, 0, &data, &size) != SDLA_RET_OK)
                        return(-EIO);
            }
            else
                  if (flp->configured)
                        memcpy(&data.config, &flp->config, sizeof(struct frad_conf));
                  else
                        memset(&data.config, 0, sizeof(struct frad_conf));

            memcpy(&flp->config, &data.config, sizeof(struct frad_conf));
            data.config.flags &= FRAD_VALID_FLAGS;
            data.config.mtu -= data.config.mtu > sizeof(struct frhdr) ? sizeof(struct frhdr) : data.config.mtu;
            return copy_to_user(conf, &data.config, sizeof(struct frad_conf))?-EFAULT:0;
      }

      return(0);
}

static int sdla_xfer(struct net_device *dev, struct sdla_mem __user *info, int read)
{
      struct sdla_mem mem;
      char  *temp;

      if(copy_from_user(&mem, info, sizeof(mem)))
            return -EFAULT;
            
      if (read)
      {     
            temp = kzalloc(mem.len, GFP_KERNEL);
            if (!temp)
                  return(-ENOMEM);
            sdla_read(dev, mem.addr, temp, mem.len);
            if(copy_to_user(mem.data, temp, mem.len))
            {
                  kfree(temp);
                  return -EFAULT;
            }
            kfree(temp);
      }
      else
      {
            temp = kmalloc(mem.len, GFP_KERNEL);
            if (!temp)
                  return(-ENOMEM);
            if(copy_from_user(temp, mem.data, mem.len))
            {
                  kfree(temp);
                  return -EFAULT;
            }
            sdla_write(dev, mem.addr, temp, mem.len);
            kfree(temp);
      }
      return(0);
}

static int sdla_reconfig(struct net_device *dev)
{
      struct frad_local *flp;
      struct conf_data  data;
      int               i, len;

      flp = dev->priv;

      len = 0;
      for(i=0;i<CONFIG_DLCI_MAX;i++)
            if (flp->dlci[i])
                  data.dlci[len++] = flp->dlci[i];
      len *= 2;

      memcpy(&data, &flp->config, sizeof(struct frad_conf));
      len += sizeof(struct frad_conf);

      sdla_cmd(dev, SDLA_DISABLE_COMMUNICATIONS, 0, 0, NULL, 0, NULL, NULL);
      sdla_cmd(dev, SDLA_SET_DLCI_CONFIGURATION, 0, 0, &data, len, NULL, NULL);
      sdla_cmd(dev, SDLA_ENABLE_COMMUNICATIONS, 0, 0, NULL, 0, NULL, NULL);

      return(0);
}

static int sdla_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
      struct frad_local *flp;

      if(!capable(CAP_NET_ADMIN))
            return -EPERM;
            
      flp = dev->priv;

      if (!flp->initialized)
            return(-EINVAL);

      switch (cmd)
      {
            case FRAD_GET_CONF:
            case FRAD_SET_CONF:
                  return(sdla_config(dev, ifr->ifr_data, cmd == FRAD_GET_CONF));

            case SDLA_IDENTIFY:
                  ifr->ifr_flags = flp->type;
                  break;

            case SDLA_CPUSPEED:
                  return(sdla_cpuspeed(dev, ifr)); 

/* ==========================================================
NOTE:  This is rather a useless action right now, as the
       current driver does not support protocols other than
       FR.  However, Sangoma has modules for a number of
       other protocols in the works.
============================================================*/
            case SDLA_PROTOCOL:
                  if (flp->configured)
                        return(-EALREADY);

                  switch (ifr->ifr_flags)
                  {
                        case ARPHRD_FRAD:
                              dev->type = ifr->ifr_flags;
                              break;
                        default:
                              return(-ENOPROTOOPT);
                  }
                  break;

            case SDLA_CLEARMEM:
                  sdla_clear(dev);
                  break;

            case SDLA_WRITEMEM:
            case SDLA_READMEM:
                  if(!capable(CAP_SYS_RAWIO))
                        return -EPERM;
                  return(sdla_xfer(dev, ifr->ifr_data, cmd == SDLA_READMEM));

            case SDLA_START:
                  sdla_start(dev);
                  break;

            case SDLA_STOP:
                  sdla_stop(dev);
                  break;

            default:
                  return(-EOPNOTSUPP);
      }
      return(0);
}

static int sdla_change_mtu(struct net_device *dev, int new_mtu)
{
      struct frad_local *flp;

      flp = dev->priv;

      if (netif_running(dev))
            return(-EBUSY);

      /* for now, you can't change the MTU! */
      return(-EOPNOTSUPP);
}

static int sdla_set_config(struct net_device *dev, struct ifmap *map)
{
      struct frad_local *flp;
      int               i;
      char              byte;
      unsigned base;
      int err = -EINVAL;

      flp = dev->priv;

      if (flp->initialized)
            return(-EINVAL);

      for(i=0; i < ARRAY_SIZE(valid_port); i++)
            if (valid_port[i] == map->base_addr)
                  break;   

      if (i == ARRAY_SIZE(valid_port))
            return(-EINVAL);

      if (!request_region(map->base_addr, SDLA_IO_EXTENTS, dev->name)){
            printk(KERN_WARNING "SDLA: io-port 0x%04lx in use \n", dev->base_addr);
            return(-EINVAL);
      }
      base = map->base_addr;

      /* test for card types, S502A, S502E, S507, S508                 */
      /* these tests shut down the card completely, so clear the state */
      flp->type = SDLA_UNKNOWN;
      flp->state = 0;
   
      for(i=1;i<SDLA_IO_EXTENTS;i++)
            if (inb(base + i) != 0xFF)
                  break;

      if (i == SDLA_IO_EXTENTS) {   
            outb(SDLA_HALT, base + SDLA_REG_Z80_CONTROL);
            if ((inb(base + SDLA_S502_STS) & 0x0F) == 0x08) {
                  outb(SDLA_S502E_INTACK, base + SDLA_REG_CONTROL);
                  if ((inb(base + SDLA_S502_STS) & 0x0F) == 0x0C) {
                        outb(SDLA_HALT, base + SDLA_REG_CONTROL);
                        flp->type = SDLA_S502E;
                        goto got_type;
                  }
            }
      }

      for(byte=inb(base),i=0;i<SDLA_IO_EXTENTS;i++)
            if (inb(base + i) != byte)
                  break;

      if (i == SDLA_IO_EXTENTS) {
            outb(SDLA_HALT, base + SDLA_REG_CONTROL);
            if ((inb(base + SDLA_S502_STS) & 0x7E) == 0x30) {
                  outb(SDLA_S507_ENABLE, base + SDLA_REG_CONTROL);
                  if ((inb(base + SDLA_S502_STS) & 0x7E) == 0x32) {
                        outb(SDLA_HALT, base + SDLA_REG_CONTROL);
                        flp->type = SDLA_S507;
                        goto got_type;
                  }
            }
      }

      outb(SDLA_HALT, base + SDLA_REG_CONTROL);
      if ((inb(base + SDLA_S508_STS) & 0x3F) == 0x00) {
            outb(SDLA_S508_INTEN, base + SDLA_REG_CONTROL);
            if ((inb(base + SDLA_S508_STS) & 0x3F) == 0x10) {
                  outb(SDLA_HALT, base + SDLA_REG_CONTROL);
                  flp->type = SDLA_S508;
                  goto got_type;
            }
      }

      outb(SDLA_S502A_HALT, base + SDLA_REG_CONTROL);
      if (inb(base + SDLA_S502_STS) == 0x40) {
            outb(SDLA_S502A_START, base + SDLA_REG_CONTROL);
            if (inb(base + SDLA_S502_STS) == 0x40) {
                  outb(SDLA_S502A_INTEN, base + SDLA_REG_CONTROL);
                  if (inb(base + SDLA_S502_STS) == 0x44) {
                        outb(SDLA_S502A_START, base + SDLA_REG_CONTROL);
                        flp->type = SDLA_S502A;
                        goto got_type;
                  }
            }
      }

      printk(KERN_NOTICE "%s: Unknown card type\n", dev->name);
      err = -ENODEV;
      goto fail;

got_type:
      switch(base) {
            case 0x270:
            case 0x280:
            case 0x380: 
            case 0x390:
                  if (flp->type != SDLA_S508 && flp->type != SDLA_S507)
                        goto fail;
      }

      switch (map->irq) {
            case 2:
                  if (flp->type != SDLA_S502E)
                        goto fail;
                  break;

            case 10:
            case 11:
            case 12:
            case 15:
            case 4:
                  if (flp->type != SDLA_S508 && flp->type != SDLA_S507)
                        goto fail;
                  break;
            case 3:
            case 5:
            case 7:
                  if (flp->type == SDLA_S502A)
                        goto fail;
                  break;

            default:
                  goto fail;
      }

      err = -EAGAIN;
      if (request_irq(dev->irq, &sdla_isr, 0, dev->name, dev)) 
            goto fail;

      if (flp->type == SDLA_S507) {
            switch(dev->irq) {
                  case 3:
                        flp->state = SDLA_S507_IRQ3;
                        break;
                  case 4:
                        flp->state = SDLA_S507_IRQ4;
                        break;
                  case 5:
                        flp->state = SDLA_S507_IRQ5;
                        break;
                  case 7:
                        flp->state = SDLA_S507_IRQ7;
                        break;
                  case 10:
                        flp->state = SDLA_S507_IRQ10;
                        break;
                  case 11:
                        flp->state = SDLA_S507_IRQ11;
                        break;
                  case 12:
                        flp->state = SDLA_S507_IRQ12;
                        break;
                  case 15:
                        flp->state = SDLA_S507_IRQ15;
                        break;
            }
      }

      for(i=0; i < ARRAY_SIZE(valid_mem); i++)
            if (valid_mem[i] == map->mem_start)
                  break;   

      err = -EINVAL;
      if (i == ARRAY_SIZE(valid_mem))
            goto fail2;

      if (flp->type == SDLA_S502A && (map->mem_start & 0xF000) >> 12 == 0x0E)
            goto fail2;

      if (flp->type != SDLA_S507 && map->mem_start >> 16 == 0x0B)
            goto fail2;

      if (flp->type == SDLA_S507 && map->mem_start >> 16 == 0x0D)
            goto fail2;

      byte = flp->type != SDLA_S508 ? SDLA_8K_WINDOW : 0;
      byte |= (map->mem_start & 0xF000) >> (12 + (flp->type == SDLA_S508 ? 1 : 0));
      switch(flp->type) {
            case SDLA_S502A:
            case SDLA_S502E:
                  switch (map->mem_start >> 16) {
                        case 0x0A:
                              byte |= SDLA_S502_SEG_A;
                              break;
                        case 0x0C:
                              byte |= SDLA_S502_SEG_C;
                              break;
                        case 0x0D:
                              byte |= SDLA_S502_SEG_D;
                              break;
                        case 0x0E:
                              byte |= SDLA_S502_SEG_E;
                              break;
                  }
                  break;
            case SDLA_S507:
                  switch (map->mem_start >> 16) {
                        case 0x0A:
                              byte |= SDLA_S507_SEG_A;
                              break;
                        case 0x0B:
                              byte |= SDLA_S507_SEG_B;
                              break;
                        case 0x0C:
                              byte |= SDLA_S507_SEG_C;
                              break;
                        case 0x0E:
                              byte |= SDLA_S507_SEG_E;
                              break;
                  }
                  break;
            case SDLA_S508:
                  switch (map->mem_start >> 16) {
                        case 0x0A:
                              byte |= SDLA_S508_SEG_A;
                              break;
                        case 0x0C:
                              byte |= SDLA_S508_SEG_C;
                              break;
                        case 0x0D:
                              byte |= SDLA_S508_SEG_D;
                              break;
                        case 0x0E:
                              byte |= SDLA_S508_SEG_E;
                              break;
                  }
                  break;
      }

      /* set the memory bits, and enable access */
      outb(byte, base + SDLA_REG_PC_WINDOW);

      switch(flp->type)
      {
            case SDLA_S502E:
                  flp->state = SDLA_S502E_ENABLE;
                  break;
            case SDLA_S507:
                  flp->state |= SDLA_MEMEN;
                  break;
            case SDLA_S508:
                  flp->state = SDLA_MEMEN;
                  break;
      }
      outb(flp->state, base + SDLA_REG_CONTROL);

      dev->irq = map->irq;
      dev->base_addr = base;
      dev->mem_start = map->mem_start;
      dev->mem_end = dev->mem_start + 0x2000;
      flp->initialized = 1;
      return 0;

fail2:
      free_irq(map->irq, dev);
fail:
      release_region(base, SDLA_IO_EXTENTS);
      return err;
}
 
static struct net_device_stats *sdla_stats(struct net_device *dev)
{
      struct frad_local *flp;
      flp = dev->priv;

      return(&flp->stats);
}

static void setup_sdla(struct net_device *dev)
{
      struct frad_local *flp = dev->priv;

      netdev_boot_setup_check(dev);

      dev->flags        = 0;
      dev->type         = 0xFFFF;
      dev->hard_header_len    = 0;
      dev->addr_len           = 0;
      dev->mtu          = SDLA_MAX_MTU;

      dev->open         = sdla_open;
      dev->stop         = sdla_close;
      dev->do_ioctl           = sdla_ioctl;
      dev->set_config         = sdla_set_config;
      dev->get_stats          = sdla_stats;
      dev->hard_start_xmit    = sdla_transmit;
      dev->change_mtu         = sdla_change_mtu;

      flp->activate           = sdla_activate;
      flp->deactivate         = sdla_deactivate;
      flp->assoc        = sdla_assoc;
      flp->deassoc            = sdla_deassoc;
      flp->dlci_conf          = sdla_dlci_conf;

      init_timer(&flp->timer);
      flp->timer.expires      = 1;
      flp->timer.data         = (unsigned long) dev;
      flp->timer.function     = sdla_poll;
}

static struct net_device *sdla;

static int __init init_sdla(void)
{
      int err;

      printk("%s.\n", version);

      sdla = alloc_netdev(sizeof(struct frad_local), "sdla0", setup_sdla);
      if (!sdla) 
            return -ENOMEM;

      err = register_netdev(sdla);
      if (err) 
            free_netdev(sdla);

      return err;
}

static void __exit exit_sdla(void)
{
      struct frad_local *flp = sdla->priv;

      unregister_netdev(sdla);
      if (flp->initialized) {
            free_irq(sdla->irq, sdla);
            release_region(sdla->base_addr, SDLA_IO_EXTENTS);
      }
      del_timer_sync(&flp->timer);
      free_netdev(sdla);
}

MODULE_LICENSE("GPL");

module_init(init_sdla);
module_exit(exit_sdla);

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