Import of Linux/MIPS 2.1.14

1 files changed, 1714 insertions, 0 deletions

diff --git a/drivers/net/sdla.c b/drivers/net/sdla.c
new file mode 100644
index 000000000..f5e4b16a6
--- /dev/null
+++ b/drivers/net/sdla.c
@@ -0,0 +1,1714 @@
+/*
+ * 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/sched.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/malloc.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/uaccess.h>
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/if_frad.h>
+
+#include <linux/sdla.h>
+
+static const char* version = "SDLA driver v0.30, 12 Sep 1996, mike.mclagan@linux.org";
+
+static const char* devname = "sdla";
+
+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}; 
+
+/*********************************************************
+ *
+ * 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 device *dev, int addr, void *buf, short len)
+{
+   unsigned long flags;
+   char          *temp, *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);
+
+      save_flags(flags);
+      cli();
+      SDLA_WINDOW(dev, addr);
+      memcpy(temp, base, bytes);
+      restore_flags(flags);
+
+      addr += bytes;
+      temp += bytes;
+      len  -= bytes;
+   }  
+}
+
+static void sdla_write(struct device *dev, int addr, void *buf, short len)
+{
+   unsigned long flags;
+   char          *temp, *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);
+
+      save_flags(flags);
+      cli();
+      SDLA_WINDOW(dev, addr);
+      memcpy(base, temp, bytes);
+      restore_flags(flags);
+
+      addr += bytes;
+      temp += bytes;
+      len  -= bytes;
+   }
+}
+
+static void sdla_clear(struct device *dev)
+{
+   unsigned long flags;
+   char          *base;
+   int           len, addr, bytes;
+
+   len = 65536;
+   addr = 0;
+   bytes = SDLA_WINDOW_SIZE;
+   base = (void *) dev->mem_start;
+
+   save_flags(flags);
+   cli();
+   while(len)
+   {
+      SDLA_WINDOW(dev, addr);
+      memset(base, 0, bytes);
+
+      addr += bytes;
+      len  -= bytes;
+   }
+   restore_flags(flags);
+}
+
+static char sdla_byte(struct device *dev, int addr)
+{
+   unsigned long flags;
+   char          byte, *temp;
+
+   temp = (void *) (dev->mem_start + (addr & SDLA_ADDR_MASK));
+
+   save_flags(flags);
+   cli();
+   SDLA_WINDOW(dev, addr);
+   byte = *temp;
+   restore_flags(flags);
+
+   return(byte);
+}
+
+void sdla_stop(struct 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;
+   }
+}
+
+void sdla_start(struct 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
+ *
+ ***************************************************/
+
+int sdla_z80_poll(struct 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 ((jiffies < done) && (resp != resp1) && (!resp2 || (resp != resp2)))
+   {
+      if (jiffies != now)
+      {
+         SDLA_WINDOW(dev, z80_addr);
+         now = jiffies;
+         resp = *temp;
+      }
+   }
+   return(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 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)
+      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		__attribute__((packed));
+   char  flags		__attribute__((packed));
+};
+
+struct _frad_stat {
+   char    flags;
+   struct _dlci_stat dlcis[SDLA_MAX_DLCI];
+};
+
+static void sdla_errors(struct 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 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;
+   int                      jiffs, 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 */
+   save_flags(pflags);
+   cli();
+   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;
+   restore_flags(pflags);
+
+   waiting = 1;
+   len = 0;
+   while (waiting && (jiffies <= jiffs))
+   {
+      if (waiting++ % 3) 
+      {
+         save_flags(pflags);
+         cli();
+         SDLA_WINDOW(dev, window);
+         waiting = ((volatile)(cmd_buf->opp_flag));
+         restore_flags(pflags);
+      }
+   }
+   
+   if (!waiting)
+   {
+      save_flags(pflags);
+      cli();
+      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);
+
+      restore_flags(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 device *dev);
+
+int sdla_activate(struct device *slave, struct 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 (slave->start && (flp->config.station == FRAD_STATION_NODE))
+      sdla_cmd(slave, SDLA_ACTIVATE_DLCI, 0, 0, &flp->dlci[i], sizeof(short), NULL, NULL);
+
+   return(0);
+}
+
+int sdla_deactivate(struct device *slave, struct 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 (slave->start && (flp->config.station == FRAD_STATION_NODE))
+      sdla_cmd(slave, SDLA_DEACTIVATE_DLCI, 0, 0, &flp->dlci[i], sizeof(short), NULL, NULL);
+
+   return(0);
+}
+
+int sdla_assoc(struct device *slave, struct 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 ?? */
+
+   MOD_INC_USE_COUNT;
+
+   flp->master[i] = master;
+   flp->dlci[i] = -*(short *)(master->dev_addr);
+   master->mtu = slave->mtu;
+
+   if (slave->start)
+      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);
+}
+
+int sdla_deassoc(struct device *slave, struct 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;
+
+   MOD_DEC_USE_COUNT;
+
+   if (slave->start)
+      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);
+}
+
+int sdla_dlci_conf(struct device *slave, struct 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 (slave->start)
+      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 device *dev)
+{
+   struct frad_local *flp;
+   int               ret, addr, accept;
+   short             size;
+   unsigned long     flags;
+   struct buf_entry  *pbuf;
+
+   flp = dev->priv;
+   ret = 0;
+   accept = 1;
+
+   if (dev->tbusy) 
+      return(1);
+
+   if (skb == NULL) 
+      return(0);
+
+   if (set_bit(0, (void*)&dev->tbusy) != 0)
+      printk(KERN_WARNING "%s: transmitter access conflict.\n", dev->name);
+   else
+   {
+      /*
+       * 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)
+               {
+                  save_flags(flags); 
+                  cli();
+                  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;
+                  restore_flags(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;
+         }
+      }
+      dev->tbusy = 0;
+   }
+   return(ret);
+}
+
+static void sdla_receive(struct device *dev)
+{
+   struct 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, 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;
+
+   save_flags(flags);
+   cli();
+
+   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);
+   }
+
+   restore_flags(flags);
+}
+
+static void sdla_isr(int irq, void *dev_id, struct pt_regs * regs)
+{
+   struct device     *dev;
+   struct frad_local *flp;
+   char              byte;
+
+   dev = irq2dev_map[irq];
+
+   if (dev == NULL)
+   {
+      printk(KERN_WARNING "sdla_isr(): irq %d for unknown device.\n", irq);
+      return;
+   }
+
+   flp = dev->priv;
+
+   if (!flp->initialized)
+   {
+      printk(KERN_WARNING "%s: irq %d for uninitialized device.\n", dev->name, irq);
+      return;
+   }
+
+   dev->interrupt = 1;
+   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));
+   dev->interrupt = 0;
+}
+
+static void sdla_poll(unsigned long device)
+{
+   struct device     *dev;
+   struct frad_local *flp;
+
+   dev = (struct 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 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);
+
+   dev->tbusy = 1;
+   dev->start = 0;
+
+   MOD_DEC_USE_COUNT;
+
+   return(0);
+}
+
+struct conf_data {
+   struct frad_conf config;
+   short            dlci[CONFIG_DLCI_MAX];
+};
+
+static int sdla_open(struct 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);
+      }
+
+   dev->tbusy = 0;
+   dev->interrupt = 0;
+   dev->start = 1;
+
+   MOD_INC_USE_COUNT;
+
+   return(0);
+}
+
+static int sdla_config(struct device *dev, struct frad_conf *conf, int get)
+{
+   struct frad_local *flp;
+   struct conf_data  data;
+   int               i, err;
+   short             size;
+
+   if (dev->type == 0xFFFF)
+      return(-EUNATCH);
+
+   flp = dev->priv;
+
+   if (!get)
+   {
+      if (dev->start)
+         return(-EBUSY);
+
+      err = verify_area(VERIFY_READ, conf, sizeof(struct frad_conf));
+      if (err)
+         return(err);
+
+      copy_from_user(&data.config, conf, sizeof(struct frad_conf));
+
+      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
+   {
+      err = verify_area(VERIFY_WRITE, conf, sizeof(struct frad_conf));
+      if (err)
+         return(err);
+
+      /* no sense reading if the CPU isn't started */
+      if (dev->start)
+      {
+         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;
+      copy_to_user(conf, &data.config, sizeof(struct frad_conf));
+   }
+
+   return(0);
+}
+
+static int sdla_xfer(struct device *dev, struct sdla_mem *info, int read)
+{
+   struct sdla_mem mem;
+   int    err;
+   char   *temp;
+
+   err = verify_area(VERIFY_READ, info, sizeof(struct sdla_mem));
+   if (err)
+      return(err);
+
+   copy_from_user(&mem, info, sizeof(mem));
+   if (read)
+   {
+      err = verify_area(VERIFY_WRITE, mem.data, mem.len);
+      if (err)
+         return(err);
+
+      temp = kmalloc(mem.len, GFP_KERNEL);
+      if (!temp)
+         return(-ENOMEM);
+      sdla_read(dev, mem.addr, temp, mem.len);
+      copy_to_user(mem.data, temp, mem.len);
+      kfree(temp);
+   }
+   else
+   {
+      err = verify_area(VERIFY_READ, mem.data, mem.len);
+      if (err)
+         return(err);
+
+      temp = kmalloc(mem.len, GFP_KERNEL);
+      if (!temp)
+         return(-ENOMEM);
+      copy_from_user(temp, mem.data, mem.len);
+      sdla_write(dev, mem.addr, temp, mem.len);
+      kfree(temp);
+   }
+   return(0);
+}
+
+static int sdla_reconfig(struct 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 device *dev, struct ifreq *ifr, int cmd)
+{
+   struct frad_local *flp;
+
+   flp = dev->priv;
+
+   if (!flp->initialized)
+      return(-EPERM);
+
+   switch (cmd)
+   {
+      case FRAD_GET_CONF:
+      case FRAD_SET_CONF:
+         return(sdla_config(dev, (struct frad_conf *)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;
+               dev->family = AF_UNSPEC;
+               break;
+
+            default:
+               return(-ENOPROTOOPT);
+         }
+         break;
+
+      case SDLA_CLEARMEM:
+         sdla_clear(dev);
+         break;
+
+      case SDLA_WRITEMEM:
+      case SDLA_READMEM:
+         return(sdla_xfer(dev, (struct sdla_mem *)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);
+}
+
+int sdla_change_mtu(struct device *dev, int new_mtu)
+{
+   struct frad_local *flp;
+
+   flp = dev->priv;
+
+   if (dev->start)
+      return(-EBUSY);
+
+   /* for now, you can't change the MTU! */
+   return(-EACCES);
+}
+
+int sdla_set_config(struct device *dev, struct ifmap *map)
+{
+   struct frad_local *flp;
+   int               i;
+   char              byte;
+
+   flp = dev->priv;
+
+   if (flp->initialized)
+      return(-EINVAL);
+
+   for(i=0;i < sizeof(valid_port) / sizeof (int) ; i++)
+      if (valid_port[i] == map->base_addr)
+         break;   
+
+   if (i == sizeof(valid_port) / sizeof(int))
+      return(-EINVAL);
+
+   dev->base_addr = map->base_addr;
+   request_region(dev->base_addr, SDLA_IO_EXTENTS, dev->name);
+
+   /* 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(dev->base_addr + i) != 0xFF)
+        break;
+
+   if (i == SDLA_IO_EXTENTS)
+   {   
+      outb(SDLA_HALT, dev->base_addr + SDLA_REG_Z80_CONTROL);
+      if ((inb(dev->base_addr + SDLA_S502_STS) & 0x0F) == 0x08)
+      {
+         outb(SDLA_S502E_INTACK, dev->base_addr + SDLA_REG_CONTROL);
+         if ((inb(dev->base_addr + SDLA_S502_STS) & 0x0F) == 0x0C)
+         {
+            outb(SDLA_HALT, dev->base_addr + SDLA_REG_CONTROL);
+            flp->type = SDLA_S502E;
+         }
+      }
+   }
+
+   if (flp->type == SDLA_UNKNOWN)
+   {
+      for(byte=inb(dev->base_addr),i=0;i<SDLA_IO_EXTENTS;i++)
+         if (inb(dev->base_addr + i) != byte)
+            break;
+
+      if (i == SDLA_IO_EXTENTS)
+      {
+         outb(SDLA_HALT, dev->base_addr + SDLA_REG_CONTROL);
+         if ((inb(dev->base_addr + SDLA_S502_STS) & 0x7E) == 0x30)
+         {
+            outb(SDLA_S507_ENABLE, dev->base_addr + SDLA_REG_CONTROL);
+            if ((inb(dev->base_addr + SDLA_S502_STS) & 0x7E) == 0x32)
+            {
+               outb(SDLA_HALT, dev->base_addr + SDLA_REG_CONTROL);
+               flp->type = SDLA_S507;
+            }
+         }
+      }
+   }
+
+   if (flp->type == SDLA_UNKNOWN)
+   {
+      outb(SDLA_HALT, dev->base_addr + SDLA_REG_CONTROL);
+      if ((inb(dev->base_addr + SDLA_S508_STS) & 0x3F) == 0x00)
+      {
+         outb(SDLA_S508_INTEN, dev->base_addr + SDLA_REG_CONTROL);
+         if ((inb(dev->base_addr + SDLA_S508_STS) & 0x3F) == 0x10)
+         {
+            outb(SDLA_HALT, dev->base_addr + SDLA_REG_CONTROL);
+            flp->type = SDLA_S508;
+         }
+      }
+   }
+
+   if (flp->type == SDLA_UNKNOWN)
+   {
+      outb(SDLA_S502A_HALT, dev->base_addr + SDLA_REG_CONTROL);
+      if (inb(dev->base_addr + SDLA_S502_STS) == 0x40)
+      {
+         outb(SDLA_S502A_START, dev->base_addr + SDLA_REG_CONTROL);
+         if (inb(dev->base_addr + SDLA_S502_STS) == 0x40)
+         {
+            outb(SDLA_S502A_INTEN, dev->base_addr + SDLA_REG_CONTROL);
+            if (inb(dev->base_addr + SDLA_S502_STS) == 0x44)
+            {
+               outb(SDLA_S502A_START, dev->base_addr + SDLA_REG_CONTROL);
+               flp->type = SDLA_S502A;
+            }
+         }
+      }
+   }
+
+   if (flp->type == SDLA_UNKNOWN)
+   {
+      printk(KERN_NOTICE "%s: Unknown card type\n", dev->name);
+      return(-ENODEV);
+   }
+
+   switch(dev->base_addr)
+   {
+      case 0x270:
+      case 0x280:
+      case 0x380: 
+      case 0x390:
+         if ((flp->type != SDLA_S508) && (flp->type != SDLA_S507))
+            return(-EINVAL);
+   }
+
+   switch (map->irq)
+   {
+      case 2:
+         if (flp->type != SDLA_S502E)
+            return(-EINVAL);
+         break;
+
+      case 10:
+      case 11:
+      case 12:
+      case 15:
+      case 4:
+         if ((flp->type != SDLA_S508) && (flp->type != SDLA_S507))
+            return(-EINVAL);
+
+      case 3:
+      case 5:
+      case 7:
+         if (flp->type == SDLA_S502A)
+            return(-EINVAL);
+         break;
+
+      default:
+         return(-EINVAL);
+   }
+   dev->irq = map->irq;
+
+   if (request_irq(dev->irq, &sdla_isr, 0, dev->name, NULL)) 
+      return(-EADDRINUSE);
+
+   irq2dev_map[dev->irq] = dev;
+
+   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 < sizeof(valid_mem) / sizeof (int) ; i++)
+      if (valid_mem[i] == map->mem_start)
+         break;   
+
+   if (i == sizeof(valid_mem) / sizeof(int))
+      return(-EINVAL);
+
+   if ((flp->type == SDLA_S502A) && (((map->mem_start & 0xF000) >> 12) == 0x0E))
+      return(-EINVAL);
+
+   if ((flp->type != SDLA_S507) && ((map->mem_start >> 16) == 0x0B))
+      return(-EINVAL);
+
+   if ((flp->type == SDLA_S507) && ((map->mem_start >> 16) == 0x0D))
+      return(-EINVAL);
+
+   dev->mem_start = map->mem_start;
+   dev->mem_end = dev->mem_start + 0x2000;
+
+   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, dev->base_addr + 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, dev->base_addr + SDLA_REG_CONTROL);
+
+   flp->initialized = 1;
+   return(0);
+}
+ 
+static struct enet_statistics *sdla_stats(struct device *dev)
+{
+   struct frad_local *flp;
+
+   flp = dev->priv;
+
+   return(&flp->stats);
+}
+
+int sdla_init(struct device *dev)
+{
+   struct frad_local *flp;
+   int               i;
+
+   /* allocate the private data structure */
+   flp = kmalloc(sizeof(struct frad_local), GFP_KERNEL);
+   if (!flp)
+      return(-ENOMEM);
+
+   memset(flp, 0, sizeof(struct frad_local));
+   dev->priv = flp;
+
+   dev->flags           = 0;
+   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;
+
+   dev->type            = 0xFFFF;
+   dev->family          = AF_UNSPEC;
+   dev->pa_alen         = 0;
+   dev->pa_addr         = 0;
+   dev->pa_dstaddr      = 0;
+   dev->pa_brdaddr      = 0;
+   dev->pa_mask         = 0;
+   dev->hard_header_len = 0;
+   dev->addr_len        = 0;
+   dev->mtu             = SDLA_MAX_MTU;
+
+   for (i = 0; i < DEV_NUMBUFFS; i++) 
+      skb_queue_head_init(&dev->buffs[i]);
+
+   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;
+
+   return(0);
+}
+
+void sdla_setup(void)
+{
+   printk("%s.\n", version);
+   register_frad(devname);
+}
+
+#ifdef MODULE
+static struct device sdla0 = {"sdla0", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, sdla_init};
+
+int init_module(void)
+{
+   int result;
+
+   sdla_setup();
+   if ((result = register_netdev(&sdla0)) != 0)
+      return result;
+
+   return 0;
+}
+
+void cleanup_module(void)
+{
+   unregister_netdev(&sdla0);
+   if (sdla0.priv)
+      kfree(sdla0.priv);
+   if (sdla0.irq)
+      free_irq(sdla0.irq, NULL);
+}
+#endif /* MODULE */