patch-2.1.88 linux/drivers/acorn/net/ether3.c

• Lines: 897
• Date: Mon Feb 16 15:49:48 1998
• Orig file: v2.1.87/linux/drivers/acorn/net/ether3.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/net/ether3.c linux/drivers/acorn/net/ether3.c
@@ -0,0 +1,896 @@
+/*
+ * linux/drivers/net/ether3.c
+ *
+ * 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.
+ *
+ * TODO:
+ *  When we detect a fatal error on the interface, we should restart it.
+ */
+
+static char *version = "ether3 ethernet driver (c) 1995-1998 R.M.King v1.12\n";
+
+#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/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/ecard.h>
+#include <asm/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "ether3.h"
+
+#ifndef MODULE
+#define CLAIM_IRQ_AT_OPEN
+#endif
+
+static unsigned int net_debug = NET_DEBUG;
+
+static const card_ids ether3_cids[] =
+{
+	{MANU_ANT2, PROD_ANT_ETHER3},
+	{MANU_ANT, PROD_ANT_ETHER3},
+	{MANU_ANT, PROD_ANT_ETHERB},	/* trial - will etherb work? */
+	{0xffff, 0xffff}
+};
+
+static void ether3_setmulticastlist(struct device *dev);
+static int ether3_rx(struct device *dev, struct dev_priv *priv, unsigned int maxcnt);
+static void ether3_tx(struct device *dev, struct dev_priv *priv);
+
+extern int inswb(int reg, void *buffer, int len);
+extern int outswb(int reg, void *buffer, int len);
+
+#define 	struct dev_priv *priv = (struct dev_priv *)dev->priv \
+	struct dev_priv *priv = (struct dev_priv *)dev->priv
+
+#define BUS_16		2
+#define BUS_8		1
+#define BUS_UNKNOWN	0
+
+/*
+ * I'm not sure what address we should default to if the internal one
+ * is corrupted...
+ */
+
+unsigned char def_eth_addr[6] =
+{0x00, 0x01, 0x02, 0x03, 0x04, 0x05};
+
+/* --------------------------------------------------------------------------- */
+
+typedef enum {
+	buffer_write,
+	buffer_read
+} buffer_rw_t;
+
+static int ether3_setbuffer(struct device *dev, buffer_rw_t read, int start)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+	int timeout = 1000;
+
+	outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+	outw(priv->regs.command | CMD_FIFOWRITE, REG_COMMAND);
+	while ((inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
+		if (!timeout--) {
+			printk(KERN_ERR "%s: setbuffer broken\n", dev->name);
+			priv->broken = 1;
+			return 1;
+		}
+		udelay(1);
+	}
+	if (read == buffer_read) {
+		outw(start, REG_DMAADDR);
+		outw(priv->regs.command | CMD_FIFOREAD, REG_COMMAND);
+	} else {
+		outw(priv->regs.command | CMD_FIFOWRITE, REG_COMMAND);
+		outw(start, REG_DMAADDR);
+	}
+	return 0;
+}
+
+/*
+ * write data to the buffer memory
+ */
+#define ether3_writebuffer(dev,data,length)			\
+	outswb (REG_BUFWIN, (data), (length))
+
+#define ether3_writeword(dev,data)				\
+	outw ((data), REG_BUFWIN)
+
+#define ether3_writelong(dev,data)	{			\
+	unsigned long reg_bufwin = REG_BUFWIN;			\
+	outw ((data), reg_bufwin);				\
+	outw ((data) >> 16, reg_bufwin);			\
+}
+
+/*
+ * read data from the buffer memory
+ */
+#define ether3_readbuffer(dev,data,length)			\
+	inswb (REG_BUFWIN, (data), (length))
+
+#define ether3_readword(dev)					\
+	inw (REG_BUFWIN)
+
+#define ether3_readlong(dev)	 				\
+	inw (REG_BUFWIN) | (inw (REG_BUFWIN) << 16)
+
+/*
+ * Switch LED off...
+ */
+static void ether3_ledoff(unsigned long data)
+{
+	struct device *dev = (struct device *) data;
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+	outw(priv->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
+}
+
+/*
+ * switch LED on...
+ */
+static inline void ether3_ledon(struct device *dev, struct dev_priv *priv)
+{
+	del_timer(&priv->timer);
+	priv->timer.expires = jiffies + HZ / 50;	/* leave on for 1/50th second */
+	priv->timer.data = (unsigned long) dev;
+	priv->timer.function = ether3_ledoff;
+	add_timer(&priv->timer);
+	if (priv->regs.config2 & CFG2_CTRLO)
+		outw(priv->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
+}
+
+/*
+ * Read the ethernet address string from the on board rom.
+ * This is an ascii string!!!
+ */
+static void 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;
+	}
+	memcpy(addr, def_eth_addr, 6);
+}
+
+/* --------------------------------------------------------------------------- */
+
+static int ether3_ramtest(struct 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", i - 1);
+				printk("\n");
+				bad = -1;
+			}
+		}
+	}
+	if (bad != -1)
+		printk(" - 0xffff\n");
+	kfree(buffer);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------------------------- */
+
+static int ether3_init_2(struct device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+	int i;
+
+	priv->regs.config1 = CFG1_RECVCOMPSTAT0 | CFG1_DMABURST8;
+	priv->regs.config2 = CFG2_CTRLO | CFG2_RECVCRC | CFG2_ERRENCRC;
+	priv->regs.command = 0;
+	/*
+	 * Set up our hardware address
+	 */
+	outw(priv->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
+	for (i = 0; i < 6; i++)
+		outb(dev->dev_addr[i], REG_BUFWIN);
+
+	if (dev->flags & IFF_PROMISC)
+		priv->regs.config1 |= CFG1_RECVPROMISC;
+	else if (dev->flags & IFF_MULTICAST)
+		priv->regs.config1 |= CFG1_RECVSPECBRMULTI;
+	else
+		priv->regs.config1 |= CFG1_RECVSPECBROAD;
+
+	/*
+	 * There is a problem with the NQ8005 in that it occasionally losses the
+	 * last two bytes.  To get round this problem, we receive the CRC as well.
+	 * That way, if we do loose the last two, then it doesn't matter
+	 */
+	outw(priv->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
+	outw((TX_END >> 8) - 1, REG_BUFWIN);
+	outw(priv->rx_head, REG_RECVPTR);
+	outw(0, REG_TRANSMITPTR);
+	outw(priv->rx_head >> 8, REG_RECVEND);
+	outw(priv->regs.config2, REG_CONFIG2);
+	outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+	outw(priv->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 device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+	int i;
+
+	memset(&priv->stats, 0, sizeof(struct enet_statistics));
+
+	priv->regs.command = 0;
+	outw(CMD_RXOFF | CMD_TXOFF, REG_COMMAND);
+	while (inw(REG_STATUS) & (STAT_RXON | STAT_TXON));
+
+	outw(priv->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
+	for (i = 0; i < 6; i++)
+		outb(dev->dev_addr[i], REG_BUFWIN);
+
+	priv->tx_used = 0;
+	priv->tx_head = 0;
+	priv->tx_tail = 0;
+	priv->regs.config2 |= CFG2_CTRLO;
+	priv->rx_head = RX_START;
+
+	outw(priv->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
+	outw((TX_END >> 8) - 1, REG_BUFWIN);
+	outw(priv->rx_head, REG_RECVPTR);
+	outw(priv->rx_head >> 8, REG_RECVEND);
+	outw(0, REG_TRANSMITPTR);
+	outw(priv->regs.config2, REG_CONFIG2);
+	outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+
+	ether3_setbuffer(dev, buffer_write, 0);
+	ether3_writelong(dev, 0);
+
+	priv->regs.command = CMD_ENINTRX;
+	outw(priv->regs.command | CMD_RXON, REG_COMMAND);
+}
+
+/*
+ * This is the real probe routine.
+ */
+static int ether3_probe1(struct device *dev)
+{
+	static unsigned version_printed = 0;
+	struct dev_priv *priv;
+	unsigned int i, bus_type, error = ENODEV;
+
+	if (net_debug && version_printed++ == 0)
+		printk(version);
+
+	if (!dev->priv) {
+		dev->priv = kmalloc(sizeof(struct dev_priv), GFP_KERNEL);
+		if (!dev->priv)
+			return -ENOMEM;
+	}
+	priv = (struct dev_priv *) dev->priv;
+	memset(priv, 0, sizeof(struct dev_priv));
+
+	request_region(dev->base_addr, 128, "ether3");
+
+	/* Reset card...
+	 */
+	outb(0x80, REG_CONFIG2 + 1);
+	bus_type = BUS_UNKNOWN;
+	udelay(4);
+
+	/* Test using Receive Pointer (16-bit register) to find out
+	 * how the ether3 is connected to the bus...
+	 */
+	outb(0, REG_RECVPTR);
+	outb(1, REG_RECVPTR + 1);
+
+	if (inb(REG_RECVPTR + 1) == 1) {
+		if (inb(REG_RECVPTR) == 0)
+			bus_type = BUS_8;
+		else if (inw(REG_RECVPTR) == 0x101)
+			bus_type = BUS_16;
+	}
+	switch (bus_type) {
+	case BUS_UNKNOWN:
+		printk(KERN_ERR "%s: unable to identify podule bus width\n", dev->name);
+		goto failed;
+
+	case BUS_8:
+		printk(KERN_ERR "%s: ether3 found, but is an unsupported 8-bit card\n", dev->name);
+		goto failed;
+
+	default:
+		break;
+	}
+
+	printk("%s: ether3 found at %lx, IRQ%d, ether address ", dev->name, dev->base_addr, dev->irq);
+	for (i = 0; i < 6; i++)
+		printk(i == 5 ? "%2.2x\n" : "%2.2x:", dev->dev_addr[i]);
+
+	if (!ether3_init_2(dev)) {
+		dev->open = ether3_open;
+		dev->stop = ether3_close;
+		dev->hard_start_xmit = ether3_sendpacket;
+		dev->get_stats = ether3_getstats;
+		dev->set_multicast_list = ether3_setmulticastlist;
+
+		/* Fill in the fields of the device structure with ethernet values. */
+		ether_setup(dev);
+#ifndef CLAIM_IRQ_AT_OPEN
+		if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
+			error = EAGAIN;
+		else
+#endif
+			return 0;
+	}
+      failed:
+	kfree(dev->priv);
+	dev->priv = NULL;
+	release_region(dev->base_addr, 128);
+	return error;
+}
+
+#ifndef MODULE
+int ether3_probe(struct device *dev)
+{
+	struct expansion_card *ec;
+
+	if (!dev)
+		return ENODEV;
+
+	ecard_startfind();
+
+	if ((ec = ecard_find(0, ether3_cids)) == NULL)
+		return ENODEV;
+
+	dev->base_addr = ecard_address(ec, ECARD_MEMC, 0);
+	dev->irq = ec->irq;
+
+	ecard_claim(ec);
+
+	ether3_addr(dev->dev_addr, ec);
+	return ether3_probe1(dev);
+}
+#endif
+
+/*
+ * 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 device *dev)
+{
+	ether3_init_for_open(dev);
+
+	MOD_INC_USE_COUNT;
+
+#ifdef CLAIM_IRQ_AT_OPEN
+	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev)) {
+		MOD_DEC_USE_COUNT;
+		return -EAGAIN;
+	}
+#endif
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+	return 0;
+}
+
+/*
+ * The inverse routine to ether3_open().
+ */
+static int ether3_close(struct device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	disable_irq(dev->irq);
+
+	outw(CMD_RXOFF | CMD_TXOFF, REG_COMMAND);
+	priv->regs.command = 0;
+	while (inw(REG_STATUS) & (STAT_RXON | STAT_TXON));
+	outb(0x80, REG_CONFIG2 + 1);
+	outw(0, REG_COMMAND);
+
+	enable_irq(dev->irq);
+#ifdef CLAIM_IRQ_AT_OPEN
+	free_irq(dev->irq, dev);
+#endif
+
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+/*
+ * Get the current statistics.        This may be called with the card open or
+ * closed.
+ */
+static struct enet_statistics *ether3_getstats(struct device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+	return &priv->stats;
+}
+
+/*
+ * 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 device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+
+	priv->regs.config1 &= ~CFG1_RECVPROMISC;
+
+	if (dev->flags & IFF_PROMISC) {
+		/* promiscuous mode */
+		priv->regs.config1 |= CFG1_RECVPROMISC;
+	} else if (dev->flags & IFF_ALLMULTI) {
+		priv->regs.config1 |= CFG1_RECVSPECBRMULTI;
+	} else
+		priv->regs.config1 |= CFG1_RECVSPECBROAD;
+
+	outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+}
+
+/*
+ * Transmit a packet
+ */
+static int ether3_sendpacket(struct sk_buff *skb, struct device *dev)
+{
+	struct dev_priv *priv = (struct dev_priv *) dev->priv;
+      retry:
+	if (!dev->tbusy) {
+		/* Block a timer-based transmit from overlapping.  This could better be
+		 * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+		 */
+		if (!test_and_set_bit(0, (void *) &dev->tbusy)) {
+			unsigned long flags;
+			unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+			unsigned int ptr, nextptr;
+
+			length = (length + 1) & ~1;
+
+			if (priv->broken) {
+				dev_kfree_skb(skb, FREE_WRITE);
+				priv->stats.tx_dropped++;
+				dev->tbusy = 0;
+				return 0;
+			}
+			ptr = priv->tx_head;
+			nextptr = ptr + 0x600;
+			if (nextptr >= TX_END)
+				nextptr = 0;
+			if (nextptr == priv->tx_tail)
+				return 1;	/* unable to queue */
+			priv->tx_head = nextptr;
+
+			save_flags_cli(flags);
+			ether3_setbuffer(dev, buffer_write, nextptr);
+			ether3_writelong(dev, 0);
+			ether3_setbuffer(dev, buffer_write, ptr + 4);
+			ether3_writebuffer(dev, skb->data, length);
+			ether3_writeword(dev, htons(nextptr));
+			ether3_writeword(dev, (TXHDR_TRANSMIT | TXHDR_CHAINCONTINUE) >> 16);
+			ether3_setbuffer(dev, buffer_write, ptr);
+#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
+			ether3_writeword(dev, htons(ptr + length + 4));
+			ether3_writeword(dev, (TXHDR_FLAGS >> 16));
+			ether3_ledon(dev, priv);
+			priv->tx_used++;
+			if (priv->tx_used < MAX_TX_BUFFERED)
+				dev->tbusy = 0;
+			if (priv->tx_used >= (MAX_TX_BUFFERED * 3 / 4)) {
+				priv->regs.command |= CMD_ENINTTX;
+				outw(priv->regs.command, REG_COMMAND);
+			}
+			restore_flags(flags);
+
+			dev->trans_start = jiffies;
+			dev_kfree_skb(skb, FREE_WRITE);
+			if (!(inw(REG_STATUS) & STAT_TXON)) {
+				outw(ptr, REG_TRANSMITPTR);
+				outw(priv->regs.command | CMD_TXON, REG_COMMAND);
+			}
+			return 0;
+		} else {
+			printk("%s: transmitter access conflict.\n", dev->name);
+			return 1;
+		}
+	} else {
+		/* If we get here, some higher level has decided we are broken.
+		 * There should really be a "kick me" function call instead.
+		 */
+		int tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < 5)
+			return 1;
+		del_timer(&priv->timer);
+		printk("%s: transmit timed out, network cable problem?\n", dev->name);
+		dev->tbusy = 0;
+		priv->regs.config2 |= CFG2_CTRLO;
+		outw(priv->regs.config2, REG_CONFIG2);
+		dev->trans_start = jiffies;
+		goto retry;
+	}
+}
+
+static void ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *) dev_id;
+	struct dev_priv *priv;
+	unsigned int status;
+
+#if NET_DEBUG > 1
+	if (net_debug & DEBUG_INT)
+		printk("eth3irq: %d ", irq);
+#endif
+
+	priv = (struct dev_priv *) dev->priv;
+
+	dev->interrupt = 1;
+	status = inw(REG_STATUS);
+	/*
+	 * Dispite we disable the TX interrupt when the packet buffer is
+	 * mostly empty, if we happen to get a RX interrupt, we might as
+	 * well handle the TX packets as well.
+	 */
+	if (status & STAT_INTTX) {	/* Packets transmitted */
+		outw(CMD_ACKINTTX | priv->regs.command, REG_COMMAND);
+		ether3_tx(dev, priv);
+	}
+	status = inw(REG_STATUS);
+	if (status & STAT_INTRX && ether3_rx(dev, priv, 12)) {	/* Got packet(s). */
+		/*
+		 * We only acknowledge the interrupt if we have received all packets
+		 * in the buffer or else we run out of memory. This is to allow the
+		 * bh routines to run.
+		 */
+		outw(CMD_ACKINTRX | priv->regs.command, REG_COMMAND);
+		/*
+		 * Receive again if some have become available - we may have cleared
+		 * a pending IRQ
+		 */
+		ether3_rx(dev, priv, 4);
+	}
+	dev->interrupt = 0;
+
+#if NET_DEBUG > 1
+	if (net_debug & DEBUG_INT)
+		printk("done\n");
+#endif
+}
+
+/*
+ * If we have a good packet(s), get it/them out of the buffers.
+ */
+static int ether3_rx(struct device *dev, struct dev_priv *priv, unsigned int maxcnt)
+{
+	unsigned int next_ptr = priv->rx_head, received = 0;
+	ether3_ledon(dev, priv);
+
+	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) || !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);
+
+		/*
+		 * 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 */
+			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 = dev_alloc_skb(length + 2);
+			if (skb) {
+				unsigned char *buf;
+
+				skb->dev = dev;
+				skb_reserve(skb, 2);
+				buf = skb_put(skb, length);
+				ether3_readbuffer(dev, buf + 12, length - 12);
+				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
+				goto dropping;
+		} else {
+			struct enet_statistics *stats = &priv->stats;
+			outw(next_ptr >> 8, REG_RECVEND);
+			if (status & RXSTAT_OVERSIZE)
+				stats->rx_length_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:
+	priv->stats.rx_packets += received;
+	priv->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 (!(inw(REG_STATUS) & STAT_RXON)) {
+		priv->stats.rx_dropped++;
+		outw(next_ptr, REG_RECVPTR);
+		outw(priv->regs.command | CMD_RXON, REG_COMMAND);
+	}
+	return maxcnt;
+
+      dropping:{
+		static unsigned long last_warned;
+
+		outw(next_ptr >> 8, REG_RECVEND);
+		/*
+		 * Don't print this message too many times...
+		 */
+		if (jiffies - last_warned > 30 * HZ) {
+			last_warned = jiffies;
+			printk("%s: memory squeeze, dropping packet.\n", dev->name);
+		}
+		priv->stats.rx_dropped++;
+		goto done;
+	}
+}
+
+/*
+ * Update stats for the transmitted packet(s)
+ */
+static void ether3_tx(struct device *dev, struct dev_priv *priv)
+{
+	unsigned int tx_tail = priv->tx_tail;
+
+	do {
+		unsigned long status;
+		/*
+		 * Read the packet header
+		 */
+		ether3_setbuffer(dev, buffer_read, tx_tail);
+		status = ether3_readlong(dev);
+
+		/*
+		 * Check to see if this packet has been transmitted
+		 */
+		if (!(status & TXSTAT_DONE) || !(status & TXHDR_TRANSMIT))
+			break;
+
+		/*
+		 * Update errors
+		 */
+		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
+			priv->stats.tx_packets++;
+		else {
+			priv->stats.tx_errors++;
+			if (status & TXSTAT_16COLLISIONS)
+				priv->stats.collisions += 16;
+			if (status & TXSTAT_BABBLED)
+				priv->stats.tx_fifo_errors++;
+		}
+
+		/*
+		 * Get next packet address
+		 */
+		tx_tail += 0x600;
+		if (tx_tail >= TX_END)
+			tx_tail = 0;
+
+		if (priv->tx_used)
+			priv->tx_used--;
+	} while (1);
+
+	if (priv->tx_tail != tx_tail) {
+		priv->tx_tail = tx_tail;
+		if (priv->tx_used <= MAX_TX_BUFFERED) {
+			dev->tbusy = 0;
+			mark_bh(NET_BH);	/* Inform upper layers. */
+		}
+	}
+	priv->regs.command &= ~CMD_ENINTTX;
+	outw(priv->regs.command, REG_COMMAND);
+}
+
+#ifdef MODULE
+
+char ethernames[MAX_ECARDS][9];
+
+static struct device *my_ethers[MAX_ECARDS];
+static struct expansion_card *ec[MAX_ECARDS];
+
+int init_module(void)
+{
+	int i;
+
+	for (i = 0; i < MAX_ECARDS; i++) {
+		my_ethers[i] = NULL;
+		ec[i] = NULL;
+		strcpy(ethernames[i], "        ");
+	}
+
+	i = 0;
+
+	ecard_startfind();
+
+	do {
+		if ((ec[i] = ecard_find(0, ether3_cids)) == NULL)
+			break;
+
+		my_ethers[i] = (struct device *) kmalloc(sizeof(struct device), GFP_KERNEL);
+		memset(my_ethers[i], 0, sizeof(struct device));
+
+		my_ethers[i]->irq = ec[i]->irq;
+		my_ethers[i]->base_addr = ecard_address(ec[i], ECARD_MEMC, 0);
+		my_ethers[i]->init = ether3_probe1;
+		my_ethers[i]->name = ethernames[i];
+
+		ether3_addr(my_ethers[i]->dev_addr, ec[i]);
+
+		ecard_claim(ec[i]);
+
+		if (register_netdev(my_ethers[i]) != 0) {
+			for (i = 0; i < 4; i++) {
+				if (my_ethers[i]) {
+					kfree(my_ethers[i]);
+					my_ethers[i] = NULL;
+				}
+				if (ec[i]) {
+					ecard_release(ec[i]);
+					ec[i] = NULL;
+				}
+			}
+			return -EIO;
+		}
+		i++;
+	}
+	while (i < MAX_ECARDS);
+
+	return i != 0 ? 0 : -ENODEV;
+}
+
+void cleanup_module(void)
+{
+	if (MOD_IN_USE) {
+		printk("ether3: device busy, remove delayed\n");
+	} else {
+		int i;
+		for (i = 0; i < MAX_ECARDS; i++) {
+			if (my_ethers[i]) {
+				release_region(my_ethers[i]->base_addr, 128);
+				unregister_netdev(my_ethers[i]);
+				my_ethers[i] = NULL;
+			}
+			if (ec[i]) {
+				ecard_release(ec[i]);
+				ec[i] = NULL;
+			}
+		}
+	}
+}
+#endif				/* MODULE */