/*
   * 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.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #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/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 = netdev_priv(dev);
  	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 = netdev_priv(dev);
  	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
  ", 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;
  } __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)
  				netdev_info(dev, "Modem DCD unexpectedly low!
  ");
  			if (*state & SDLA_MODEM_CTS_LOW)
  				netdev_info(dev, "Modem CTS unexpectedly low!
  ");
  			/* I should probably do something about this! */
  			break;
  
  		case SDLA_RET_CHANNEL_OFF:
  			netdev_info(dev, "Channel became inoperative!
  ");
  			/* same here */
  			break;
  
  		case SDLA_RET_CHANNEL_ON:
  			netdev_info(dev, "Channel became operative!
  ");
  			/* same here */
  			break;
  
  		case SDLA_RET_DLCI_STATUS:
  			netdev_info(dev, "Status change reported by Access Node
  ");
  			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;
  				}
  				netdev_info(dev, "DLCI %i: %s
  ",
  					    pstatus->dlci, state);
  				/* same here */
  			}
  			break;
  
  		case SDLA_RET_DLCI_UNKNOWN:
  			netdev_info(dev, "Received unknown DLCIs:");
  			len /= sizeof(short);
  			for(pdlci = data,i=0;i < len;i++,pdlci++)
  				pr_cont(" %i", *pdlci);
  			pr_cont("
  ");
  			break;
  
  		case SDLA_RET_TIMEOUT:
  			netdev_err(dev, "Command timed out!
  ");
  			break;
  
  		case SDLA_RET_BUF_OVERSIZE:
  			netdev_info(dev, "Bc/CIR overflow, acceptable size is %i
  ",
  				    len);
  			break;
  
  		case SDLA_RET_BUF_TOO_BIG:
  			netdev_info(dev, "Buffer size over specified max of %i
  ",
  				    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: 
  			netdev_dbg(dev, "Cmd 0x%02X generated return code 0x%02X
  ",
  				   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 = netdev_priv(dev);
  	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 = netdev_priv(slave);
  
  	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 = netdev_priv(slave);
  
  	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 = netdev_priv(slave);
  
  	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 = netdev_priv(slave);
  
  	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 = netdev_priv(slave);
  
  	for(i=0;i<CONFIG_DLCI_MAX;i++)
  		if (flp->master[i] == master)
  			break;
  
  	if (i == CONFIG_DLCI_MAX)
  		return -ENODEV;
  
  	dlp = netdev_priv(master);
  
  	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 netdev_tx_t 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 = netdev_priv(dev);
  	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)
  			{
  				netdev_warn(dev, "Non DLCI device, type %i, tried to send on FRAD module
  ",
  					    skb->dev->type);
  				accept = 0;
  			}
  			break;
  		default:
  			netdev_warn(dev, "unknown firmware type 0x%04X
  ",
  				    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:
  				dev->stats.tx_packets++;
  				break;
  
  			case SDLA_RET_CIR_OVERFLOW:
  			case SDLA_RET_BUF_OVERSIZE:
  			case SDLA_RET_NO_BUFS:
  				dev->stats.tx_dropped++;
  				break;
  
  			default:
  				dev->stats.tx_errors++;
  				break;
  		}
  	}
  	netif_wake_queue(dev);
  	for(i=0;i<CONFIG_DLCI_MAX;i++)
  	{
  		if(flp->master[i]!=NULL)
  			netif_wake_queue(flp->master[i]);
  	}		
  
  	dev_kfree_skb(skb);
  	return NETDEV_TX_OK;
  }
  
  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 = netdev_priv(dev);
  	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)
  		{
  			netdev_notice(dev, "Received packet from invalid DLCI %i, ignoring
  ",
  				      dlci);
  			dev->stats.rx_errors++;
  			success = 0;
  		}
  	}
  
  	if (success)
  	{
  		master = flp->master[i];
  		skb = dev_alloc_skb(len + sizeof(struct frhdr));
  		if (skb == NULL) 
  		{
  			netdev_notice(dev, "Memory squeeze, dropping packet
  ");
  			dev->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)
  	{
  		dev->stats.rx_packets++;
  		dlp = netdev_priv(master);
  		(*dlp->receive)(skb, master);
  	}
  
  	spin_unlock_irqrestore(&sdla_lock, flags);
  }
  
  static irqreturn_t sdla_isr(int dummy, void *dev_id)
  {
  	struct net_device     *dev;
  	struct frad_local *flp;
  	char              byte;
  
  	dev = dev_id;
  
  	flp = netdev_priv(dev);
  
  	if (!flp->initialized)
  	{
  		netdev_warn(dev, "irq %d for uninitialized device
  ", dev->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:
  			netdev_warn(dev, "invalid irq flag 0x%02X
  ", 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 = netdev_priv(dev);
  
  	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 = netdev_priv(dev);
  
  	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 = netdev_priv(dev);
  
  	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 = netdev_priv(flp->master[i]);
  			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 = netdev_priv(dev);
  
  	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 = memdup_user(mem.data, mem.len);
  		if (IS_ERR(temp))
  			return PTR_ERR(temp);
  		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 = netdev_priv(dev);
  
  	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 = netdev_priv(dev);
  
  	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)
  {
  	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 = netdev_priv(dev);
  
  	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)){
  		pr_warn("io-port 0x%04lx in use
  ", 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;
  			}
  		}
  	}
  
  	netdev_notice(dev, "Unknown card type
  ");
  	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 const struct net_device_ops sdla_netdev_ops = {
  	.ndo_open	= sdla_open,
  	.ndo_stop	= sdla_close,
  	.ndo_do_ioctl	= sdla_ioctl,
  	.ndo_set_config	= sdla_set_config,
  	.ndo_start_xmit	= sdla_transmit,
  	.ndo_change_mtu	= sdla_change_mtu,
  };
  
  static void setup_sdla(struct net_device *dev)
  {
  	struct frad_local *flp = netdev_priv(dev);
  
  	netdev_boot_setup_check(dev);
  
  	dev->netdev_ops		= &sdla_netdev_ops;
  	dev->flags		= 0;
  	dev->type		= 0xFFFF;
  	dev->hard_header_len	= 0;
  	dev->addr_len		= 0;
  	dev->mtu		= SDLA_MAX_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.
  ", version);
  
  	sdla = alloc_netdev(sizeof(struct frad_local), "sdla0",
  			    NET_NAME_UNKNOWN, 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 = netdev_priv(sdla);
  
  	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);