text: /*
   *  linux/drivers/acorn/net/ether3.c
   *
   *  Copyright (C) 1995-2000 Russell King
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
   *  for Acorn machines
   *
   * By Russell King, with some suggestions from borris@ant.co.uk
   *
   * Changelog:
   * 1.04	RMK	29/02/1996	Won't pass packets that are from our ethernet
   *				address up to the higher levels - they're
   *				silently ignored.  I/F can now be put into
   *				multicast mode.  Receiver routine optimised.
   * 1.05	RMK	30/02/1996	Now claims interrupt at open when part of
   *				the kernel rather than when a module.
   * 1.06	RMK	02/03/1996	Various code cleanups
   * 1.07	RMK	13/10/1996	Optimised interrupt routine and transmit
   *				routines.
   * 1.08	RMK	14/10/1996	Fixed problem with too many packets,
   *				prevented the kernel message about dropped
   *				packets appearing too many times a second.
   *				Now does not disable all IRQs, only the IRQ
   *				used by this card.
   * 1.09	RMK	10/11/1996	Only enables TX irq when buffer space is low,
   *				but we still service the TX queue if we get a
   *				RX interrupt.
   * 1.10	RMK	15/07/1997	Fixed autoprobing of NQ8004.
   * 1.11	RMK	16/11/1997	Fixed autoprobing of NQ8005A.
   * 1.12	RMK	31/12/1997	Removed reference to dev_tint for Linux 2.1.
   *      RMK	27/06/1998	Changed asm/delay.h to linux/delay.h.
   * 1.13	RMK	29/06/1998	Fixed problem with transmission of packets.
   *				Chip seems to have a bug in, whereby if the
   *				packet starts two bytes from the end of the
   *				buffer, it corrupts the receiver chain, and
   *				never updates the transmit status correctly.
   * 1.14	RMK	07/01/1998	Added initial code for ETHERB addressing.
   * 1.15	RMK	30/04/1999	More fixes to the transmit routine for buggy
   *				hardware.
   * 1.16	RMK	10/02/2000	Updated for 2.3.43
   * 1.17	RMK	13/05/2000	Updated for 2.3.99-pre8
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/fcntl.h>
  #include <linux/interrupt.h>
  #include <linux/ioport.h>
  #include <linux/in.h>
  #include <linux/slab.h>
  #include <linux/string.h>
  #include <linux/errno.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/device.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/bitops.h>
  
  #include <asm/ecard.h>
  #include <asm/io.h>
  
  static char version[] = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  
  #include "ether3.h"
  
  static unsigned int net_debug = NET_DEBUG;
  
  static void	ether3_setmulticastlist(struct net_device *dev);
  static int	ether3_rx(struct net_device *dev, unsigned int maxcnt);
  static void	ether3_tx(struct net_device *dev);
  static int	ether3_open (struct net_device *dev);
  static netdev_tx_t	ether3_sendpacket(struct sk_buff *skb,
  					  struct net_device *dev);
  static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  static int	ether3_close (struct net_device *dev);
  static void	ether3_setmulticastlist (struct net_device *dev);
  static void	ether3_timeout(struct net_device *dev);
  
  #define BUS_16		2
  #define BUS_8		1
  #define BUS_UNKNOWN	0
  
  /* --------------------------------------------------------------------------- */
  
  typedef enum {
  	buffer_write,
  	buffer_read
  } buffer_rw_t;
  
  /*
   * ether3 read/write.  Slow things down a bit...
   * The SEEQ8005 doesn't like us writing to its registers
   * too quickly.
   */
  static inline void ether3_outb(int v, void __iomem *r)
  {
  	writeb(v, r);
  	udelay(1);
  }
  
  static inline void ether3_outw(int v, void __iomem *r)
  {
  	writew(v, r);
  	udelay(1);
  }
  #define ether3_inb(r)		({ unsigned int __v = readb((r)); udelay(1); __v; })
  #define ether3_inw(r)		({ unsigned int __v = readw((r)); udelay(1); __v; })
  
  static int
  ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
  {
  	int timeout = 1000;
  
  	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
  	ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
  
  	while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
  		if (!timeout--) {
  			printk("%s: setbuffer broken\n", dev->name);
  			priv(dev)->broken = 1;
  			return 1;
  		}
  		udelay(1);
  	}
  
  	if (read == buffer_read) {
  		ether3_outw(start, REG_DMAADDR);
  		ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
  	} else {
  		ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
  		ether3_outw(start, REG_DMAADDR);
  	}
  	return 0;
  }
  
  /*
   * write data to the buffer memory
   */
  #define ether3_writebuffer(dev,data,length)			\
  	writesw(REG_BUFWIN, (data), (length) >> 1)
  
  #define ether3_writeword(dev,data)				\
  	writew((data), REG_BUFWIN)
  
  #define ether3_writelong(dev,data)	{			\
  	void __iomem *reg_bufwin = REG_BUFWIN;			\
  	writew((data), reg_bufwin);				\
  	writew((data) >> 16, reg_bufwin);			\
  }
  
  /*
   * read data from the buffer memory
   */
  #define ether3_readbuffer(dev,data,length)			\
  	readsw(REG_BUFWIN, (data), (length) >> 1)
  
  #define ether3_readword(dev)					\
  	readw(REG_BUFWIN)
  
  #define ether3_readlong(dev)	 				\
  	readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
  
  /*
   * Switch LED off...
   */
  static void ether3_ledoff(struct timer_list *t)
  {
  	struct dev_priv *private = from_timer(private, t, timer);
  	struct net_device *dev = private->dev;
  
  	ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
  }
  
  /*
   * switch LED on...
   */
  static inline void ether3_ledon(struct net_device *dev)
  {
  	del_timer(&priv(dev)->timer);
  	priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
  	add_timer(&priv(dev)->timer);
  	if (priv(dev)->regs.config2 & CFG2_CTRLO)
  		ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
  }
  
  /*
   * Read the ethernet address string from the on board rom.
   * This is an ascii string!!!
   */
  static int
  ether3_addr(char *addr, struct expansion_card *ec)
  {
  	struct in_chunk_dir cd;
  	char *s;
  	
  	if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
  		int i;
  		for (i = 0; i<6; i++) {
  			addr[i] = simple_strtoul(s + 1, &s, 0x10);
  			if (*s != (i==5?')' : ':' ))
  				break;
  		}
  		if (i == 6)
  			return 0;
  	}
  	/* I wonder if we should even let the user continue in this case
  	 *   - no, it would be better to disable the device
  	 */
  	printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
  	return -ENODEV;
  }
  
  /* --------------------------------------------------------------------------- */
  
  static int
  ether3_ramtest(struct net_device *dev, unsigned char byte)
  {
  	unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
  	int i,ret = 0;
  	int max_errors = 4;
  	int bad = -1;
  
  	if (!buffer)
  		return 1;
  
  	memset(buffer, byte, RX_END);
  	ether3_setbuffer(dev, buffer_write, 0);
  	ether3_writebuffer(dev, buffer, TX_END);
  	ether3_setbuffer(dev, buffer_write, RX_START);
  	ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
  	memset(buffer, byte ^ 0xff, RX_END);
  	ether3_setbuffer(dev, buffer_read, 0);
  	ether3_readbuffer(dev, buffer, TX_END);
  	ether3_setbuffer(dev, buffer_read, RX_START);
  	ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
  
  	for (i = 0; i < RX_END; i++) {
  		if (buffer[i] != byte) {
  			if (max_errors > 0 && bad != buffer[i]) {
  				printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
  				       dev->name, buffer[i], byte, i);
  				ret = 2;
  				max_errors--;
  				bad = i;
  			}
  		} else {
  			if (bad != -1) {
  				if (bad != i - 1)
  					printk(" - 0x%04X\n", i - 1);
  				printk("\n");
  				bad = -1;
  			}
  		}
  	}
  	if (bad != -1)
  		printk(" - 0xffff\n");
  	kfree(buffer);
  
  	return ret;
  }
  
  /* ------------------------------------------------------------------------------- */
  
  static int ether3_init_2(struct net_device *dev)
  {
  	int i;
  
  	priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
  	priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
  	priv(dev)->regs.command = 0;
  
  	/*
  	 * Set up our hardware address
  	 */
  	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
  	for (i = 0; i < 6; i++)
  		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
  
  	if (dev->flags & IFF_PROMISC)
  		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
  	else if (dev->flags & IFF_MULTICAST)
  		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
  	else
  		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
  
  	/*
  	 * There is a problem with the NQ8005 in that it occasionally loses the
  	 * last two bytes.  To get round this problem, we receive the CRC as
  	 * well.  That way, if we do lose the last two, then it doesn't matter.
  	 */
  	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
  	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
  	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
  	ether3_outw(0, REG_TRANSMITPTR);
  	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
  	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
  	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
  	ether3_outw(priv(dev)->regs.command, REG_COMMAND);
  
  	i = ether3_ramtest(dev, 0x5A);
  	if(i)
  		return i;
  	i = ether3_ramtest(dev, 0x1E);
  	if(i)
  		return i;
  
  	ether3_setbuffer(dev, buffer_write, 0);
  	ether3_writelong(dev, 0);
  	return 0;
  }
  
  static void
  ether3_init_for_open(struct net_device *dev)
  {
  	int i;
  
  	/* Reset the chip */
  	ether3_outw(CFG2_RESET, REG_CONFIG2);
  	udelay(4);
  
  	priv(dev)->regs.command = 0;
  	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
  	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
  		barrier();
  
  	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
  	for (i = 0; i < 6; i++)
  		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
  
  	priv(dev)->tx_head	= 0;
  	priv(dev)->tx_tail	= 0;
  	priv(dev)->regs.config2 |= CFG2_CTRLO;
  	priv(dev)->rx_head	= RX_START;
  
  	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
  	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
  	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
  	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
  	ether3_outw(0, REG_TRANSMITPTR);
  	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
  	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
  
  	ether3_setbuffer(dev, buffer_write, 0);
  	ether3_writelong(dev, 0);
  
  	priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
  	ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
  }
  
  static inline int
  ether3_probe_bus_8(struct net_device *dev, int val)
  {
  	int write_low, write_high, read_low, read_high;
  
  	write_low = val & 255;
  	write_high = val >> 8;
  
  	printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
  
  	ether3_outb(write_low, REG_RECVPTR);
  	ether3_outb(write_high, REG_RECVPTR + 4);
  
  	read_low = ether3_inb(REG_RECVPTR);
  	read_high = ether3_inb(REG_RECVPTR + 4);
  
  	printk(", read8 [%02X:%02X]\n", read_high, read_low);
  
  	return read_low == write_low && read_high == write_high;
  }
  
  static inline int
  ether3_probe_bus_16(struct net_device *dev, int val)
  {
  	int read_val;
  
  	ether3_outw(val, REG_RECVPTR);
  	read_val = ether3_inw(REG_RECVPTR);
  
  	printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
  
  	return read_val == val;
  }
  
  /*
   * Open/initialize the board.  This is called (in the current kernel)
   * sometime after booting when the 'ifconfig' program is run.
   *
   * This routine should set everything up anew at each open, even
   * registers that "should" only need to be set once at boot, so that
   * there is non-reboot way to recover if something goes wrong.
   */
  static int
  ether3_open(struct net_device *dev)
  {
  	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
  		return -EAGAIN;
  
  	ether3_init_for_open(dev);
  
  	netif_start_queue(dev);
  
  	return 0;
  }
  
  /*
   * The inverse routine to ether3_open().
   */
  static int
  ether3_close(struct net_device *dev)
  {
  	netif_stop_queue(dev);
  
  	disable_irq(dev->irq);
  
  	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
  	priv(dev)->regs.command = 0;
  	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
  		barrier();
  	ether3_outb(0x80, REG_CONFIG2 + 4);
  	ether3_outw(0, REG_COMMAND);
  
  	free_irq(dev->irq, dev);
  
  	return 0;
  }
  
  /*
   * Set or clear promiscuous/multicast mode filter for this adaptor.
   *
   * We don't attempt any packet filtering.  The card may have a SEEQ 8004
   * in which does not have the other ethernet address registers present...
   */
  static void ether3_setmulticastlist(struct net_device *dev)
  {
  	priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
  
  	if (dev->flags & IFF_PROMISC) {
  		/* promiscuous mode */
  		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
  	} else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
  		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
  	} else
  		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
  
  	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
  }
  
  static void ether3_timeout(struct net_device *dev)
  {
  	unsigned long flags;
  
  	del_timer(&priv(dev)->timer);
  
  	local_irq_save(flags);
  	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
  	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
  		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
  	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
  		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
  	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
  		priv(dev)->tx_head, priv(dev)->tx_tail);
  	ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
  	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
  	local_irq_restore(flags);
  
  	priv(dev)->regs.config2 |= CFG2_CTRLO;
  	dev->stats.tx_errors += 1;
  	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
  	priv(dev)->tx_head = priv(dev)->tx_tail = 0;
  
  	netif_wake_queue(dev);
  }
  
  /*
   * Transmit a packet
   */
  static netdev_tx_t
  ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
  {
  	unsigned long flags;
  	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
  	unsigned int ptr, next_ptr;
  
  	if (priv(dev)->broken) {
  		dev_kfree_skb(skb);
  		dev->stats.tx_dropped++;
  		netif_start_queue(dev);
  		return NETDEV_TX_OK;
  	}
  
  	length = (length + 1) & ~1;
  	if (length != skb->len) {
  		if (skb_padto(skb, length))
  			goto out;
  	}
  
  	next_ptr = (priv(dev)->tx_head + 1) & 15;
  
  	local_irq_save(flags);
  
  	if (priv(dev)->tx_tail == next_ptr) {
  		local_irq_restore(flags);
  		return NETDEV_TX_BUSY;	/* unable to queue */
  	}
  
  	ptr		 = 0x600 * priv(dev)->tx_head;
  	priv(dev)->tx_head = next_ptr;
  	next_ptr	*= 0x600;
  
  #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
  
  	ether3_setbuffer(dev, buffer_write, next_ptr);
  	ether3_writelong(dev, 0);
  	ether3_setbuffer(dev, buffer_write, ptr);
  	ether3_writelong(dev, 0);
  	ether3_writebuffer(dev, skb->data, length);
  	ether3_writeword(dev, htons(next_ptr));
  	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
  	ether3_setbuffer(dev, buffer_write, ptr);
  	ether3_writeword(dev, htons((ptr + length + 4)));
  	ether3_writeword(dev, TXHDR_FLAGS >> 16);
  	ether3_ledon(dev);
  
  	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
  		ether3_outw(ptr, REG_TRANSMITPTR);
  		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
  	}
  
  	next_ptr = (priv(dev)->tx_head + 1) & 15;
  	local_irq_restore(flags);
  
  	dev_kfree_skb(skb);
  
  	if (priv(dev)->tx_tail == next_ptr)
  		netif_stop_queue(dev);
  
   out:
  	return NETDEV_TX_OK;
  }
  
  static irqreturn_t
  ether3_interrupt(int irq, void *dev_id)
  {
  	struct net_device *dev = (struct net_device *)dev_id;
  	unsigned int status, handled = IRQ_NONE;
  
  #if NET_DEBUG > 1
  	if(net_debug & DEBUG_INT)
  		printk("eth3irq: %d ", irq);
  #endif
  
  	status = ether3_inw(REG_STATUS);
  
  	if (status & STAT_INTRX) {
  		ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
  		ether3_rx(dev, 12);
  		handled = IRQ_HANDLED;
  	}
  
  	if (status & STAT_INTTX) {
  		ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
  		ether3_tx(dev);
  		handled = IRQ_HANDLED;
  	}
  
  #if NET_DEBUG > 1
  	if(net_debug & DEBUG_INT)
  		printk("done\n");
  #endif
  	return handled;
  }
  
  /*
   * If we have a good packet(s), get it/them out of the buffers.
   */
  static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
  {
  	unsigned int next_ptr = priv(dev)->rx_head, received = 0;
  
  	ether3_ledon(dev);
  
  	do {
  		unsigned int this_ptr, status;
  		unsigned char addrs[16];
  
  		/*
  		 * read the first 16 bytes from the buffer.
  		 * This contains the status bytes etc and ethernet addresses,
  		 * and we also check the source ethernet address to see if
  		 * it originated from us.
  		 */
  		{
  			unsigned int temp_ptr;
  			ether3_setbuffer(dev, buffer_read, next_ptr);
  			temp_ptr = ether3_readword(dev);
  			status = ether3_readword(dev);
  			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
  				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
  				break;
  
  			this_ptr = next_ptr + 4;
  			next_ptr = ntohs(temp_ptr);
  		}
  		ether3_setbuffer(dev, buffer_read, this_ptr);
  		ether3_readbuffer(dev, addrs+2, 12);
  
  if (next_ptr < RX_START || next_ptr >= RX_END) {
   int i;
   printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
   printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
   for (i = 2; i < 14; i++)
     printk("%02X ", addrs[i]);
   printk("\n");
   next_ptr = priv(dev)->rx_head;
   break;
  }
  		/*
   		 * ignore our own packets...
  	 	 */
  		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
  		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
  			maxcnt ++; /* compensate for loopedback packet */
  			ether3_outw(next_ptr >> 8, REG_RECVEND);
  		} else
  		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
  			unsigned int length = next_ptr - this_ptr;
  			struct sk_buff *skb;
  
  			if (next_ptr <= this_ptr)
  				length += RX_END - RX_START;
  
  			skb = netdev_alloc_skb(dev, length + 2);
  			if (skb) {
  				unsigned char *buf;
  
  				skb_reserve(skb, 2);
  				buf = skb_put(skb, length);
  				ether3_readbuffer(dev, buf + 12, length - 12);
  				ether3_outw(next_ptr >> 8, REG_RECVEND);
  				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
  				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
  				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
  				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
  				skb->protocol = eth_type_trans(skb, dev);
  				netif_rx(skb);
  				received ++;
  			} else {
  				ether3_outw(next_ptr >> 8, REG_RECVEND);
  				dev->stats.rx_dropped++;
  				goto done;
  			}
  		} else {
  			struct net_device_stats *stats = &dev->stats;
  			ether3_outw(next_ptr >> 8, REG_RECVEND);
  			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
  			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
  			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
  			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
  			stats->rx_errors++;
  		}
  	}
  	while (-- maxcnt);
  
  done:
  	dev->stats.rx_packets += received;
  	priv(dev)->rx_head = next_ptr;
  	/*
  	 * If rx went off line, then that means that the buffer may be full.  We
  	 * have dropped at least one packet.
  	 */
  	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
  		dev->stats.rx_dropped++;
      		ether3_outw(next_ptr, REG_RECVPTR);
  		ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
  	}
  
  	return maxcnt;
  }
  
  /*
   * Update stats for the transmitted packet(s)
   */
  static void ether3_tx(struct net_device *dev)
  {
  	unsigned int tx_tail = priv(dev)->tx_tail;
  	int max_work = 14;
  
  	do {
  	    	unsigned long status;
  
      		/*
  	    	 * Read the packet header
      		 */
  	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
      		status = ether3_readlong(dev);
  
  		/*
  		 * Check to see if this packet has been transmitted
  		 */
  		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
  		    (TXSTAT_DONE | TXHDR_TRANSMIT))
  			break;
  
  		/*
  		 * Update errors
  		 */
  		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
  			dev->stats.tx_packets++;
  		else {
  			dev->stats.tx_errors++;
  			if (status & TXSTAT_16COLLISIONS)
  				dev->stats.collisions += 16;
  			if (status & TXSTAT_BABBLED)
  				dev->stats.tx_fifo_errors++;
  		}
  
  		tx_tail = (tx_tail + 1) & 15;
  	} while (--max_work);
  
  	if (priv(dev)->tx_tail != tx_tail) {
  		priv(dev)->tx_tail = tx_tail;
  		netif_wake_queue(dev);
  	}
  }
  
  static void ether3_banner(void)
  {
  	static unsigned version_printed = 0;
  
  	if (net_debug && version_printed++ == 0)
  		printk(KERN_INFO "%s", version);
  }
  
  static const struct net_device_ops ether3_netdev_ops = {
  	.ndo_open		= ether3_open,
  	.ndo_stop		= ether3_close,
  	.ndo_start_xmit		= ether3_sendpacket,
  	.ndo_set_rx_mode	= ether3_setmulticastlist,
  	.ndo_tx_timeout		= ether3_timeout,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_set_mac_address	= eth_mac_addr,
  };
  
  static int
  ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
  {
  	const struct ether3_data *data = id->data;
  	struct net_device *dev;
  	int bus_type, ret;
  
  	ether3_banner();
  
  	ret = ecard_request_resources(ec);
  	if (ret)
  		goto out;
  
  	dev = alloc_etherdev(sizeof(struct dev_priv));
  	if (!dev) {
  		ret = -ENOMEM;
  		goto release;
  	}
  
  	SET_NETDEV_DEV(dev, &ec->dev);
  
  	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
  	if (!priv(dev)->base) {
  		ret = -ENOMEM;
  		goto free;
  	}
  
  	ec->irqaddr = priv(dev)->base + data->base_offset;
  	ec->irqmask = 0xf0;
  
  	priv(dev)->seeq = priv(dev)->base + data->base_offset;
  	dev->irq = ec->irq;
  
  	ether3_addr(dev->dev_addr, ec);
  
  	priv(dev)->dev = dev;
  	timer_setup(&priv(dev)->timer, ether3_ledoff, 0);
  
  	/* Reset card...
  	 */
  	ether3_outb(0x80, REG_CONFIG2 + 4);
  	bus_type = BUS_UNKNOWN;
  	udelay(4);
  
  	/* Test using Receive Pointer (16-bit register) to find out
  	 * how the ether3 is connected to the bus...
  	 */
  	if (ether3_probe_bus_8(dev, 0x100) &&
  	    ether3_probe_bus_8(dev, 0x201))
  		bus_type = BUS_8;
  
  	if (bus_type == BUS_UNKNOWN &&
  	    ether3_probe_bus_16(dev, 0x101) &&
  	    ether3_probe_bus_16(dev, 0x201))
  		bus_type = BUS_16;
  
  	switch (bus_type) {
  	case BUS_UNKNOWN:
  		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
  		ret = -ENODEV;
  		goto free;
  
  	case BUS_8:
  		printk(KERN_ERR "%s: %s found, but is an unsupported "
  			"8-bit card\n", dev->name, data->name);
  		ret = -ENODEV;
  		goto free;
  
  	default:
  		break;
  	}
  
  	if (ether3_init_2(dev)) {
  		ret = -ENODEV;
  		goto free;
  	}
  
  	dev->netdev_ops		= &ether3_netdev_ops;
  	dev->watchdog_timeo	= 5 * HZ / 100;
  
  	ret = register_netdev(dev);
  	if (ret)
  		goto free;
  
  	printk("%s: %s in slot %d, %pM\n",
  	       dev->name, data->name, ec->slot_no, dev->dev_addr);
  
  	ecard_set_drvdata(ec, dev);
  	return 0;
  
   free:
  	free_netdev(dev);
   release:
  	ecard_release_resources(ec);
   out:
  	return ret;
  }
  
  static void ether3_remove(struct expansion_card *ec)
  {
  	struct net_device *dev = ecard_get_drvdata(ec);
  
  	ecard_set_drvdata(ec, NULL);
  
  	unregister_netdev(dev);
  	free_netdev(dev);
  	ecard_release_resources(ec);
  }
  
  static struct ether3_data ether3 = {
  	.name		= "ether3",
  	.base_offset	= 0,
  };
  
  static struct ether3_data etherb = {
  	.name		= "etherb",
  	.base_offset	= 0x800,
  };
  
  static const struct ecard_id ether3_ids[] = {
  	{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
  	{ MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
  	{ MANU_ANT,  PROD_ANT_ETHERB, &etherb },
  	{ 0xffff, 0xffff }
  };
  
  static struct ecard_driver ether3_driver = {
  	.probe		= ether3_probe,
  	.remove		= ether3_remove,
  	.id_table	= ether3_ids,
  	.drv = {
  		.name	= "ether3",
  	},
  };
  
  static int __init ether3_init(void)
  {
  	return ecard_register_driver(&ether3_driver);
  }
  
  static void __exit ether3_exit(void)
  {
  	ecard_remove_driver(&ether3_driver);
  }
  
  module_init(ether3_init);
  module_exit(ether3_exit);
  
  MODULE_LICENSE("GPL");
  