Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 766 insertions, 0 deletions

diff --git a/drivers/net/ethernet/amd/am79c961a.c b/drivers/net/ethernet/amd/am79c961a.c
new file mode 100644
index 000000000..265039c57
--- /dev/null
+++ b/drivers/net/ethernet/amd/am79c961a.c
@@ -0,0 +1,766 @@
+/*
+ *  linux/drivers/net/ethernet/amd/am79c961a.c
+ *
+ *  by Russell King <rmk@arm.linux.org.uk> 1995-2001.
+ *
+ * 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.
+ *
+ * Derived from various things including skeleton.c
+ *
+ * This is a special driver for the am79c961A Lance chip used in the
+ * Intel (formally Digital Equipment Corp) EBSA110 platform.  Please
+ * note that this can not be built as a module (it doesn't make sense).
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+
+#define TX_BUFFERS 15
+#define RX_BUFFERS 25
+
+#include "am79c961a.h"
+
+static irqreturn_t
+am79c961_interrupt (int irq, void *dev_id);
+
+static unsigned int net_debug = NET_DEBUG;
+
+static const char version[] =
+	"am79c961 ethernet driver (C) 1995-2001 Russell King v0.04\n";
+
+/* --------------------------------------------------------------------------- */
+
+#ifdef __arm__
+static void write_rreg(u_long base, u_int reg, u_int val)
+{
+	asm volatile(
+	"strh	%1, [%2]	@ NET_RAP\n\t"
+	"strh	%0, [%2, #-4]	@ NET_RDP"
+	:
+	: "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
+}
+
+static inline unsigned short read_rreg(u_long base_addr, u_int reg)
+{
+	unsigned short v;
+	asm volatile(
+	"strh	%1, [%2]	@ NET_RAP\n\t"
+	"ldrh	%0, [%2, #-4]	@ NET_RDP"
+	: "=r" (v)
+	: "r" (reg), "r" (ISAIO_BASE + 0x0464));
+	return v;
+}
+
+static inline void write_ireg(u_long base, u_int reg, u_int val)
+{
+	asm volatile(
+	"strh	%1, [%2]	@ NET_RAP\n\t"
+	"strh	%0, [%2, #8]	@ NET_IDP"
+	:
+	: "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
+}
+
+static inline unsigned short read_ireg(u_long base_addr, u_int reg)
+{
+	u_short v;
+	asm volatile(
+	"strh	%1, [%2]	@ NAT_RAP\n\t"
+	"ldrh	%0, [%2, #8]	@ NET_IDP\n\t"
+	: "=r" (v)
+	: "r" (reg), "r" (ISAIO_BASE + 0x0464));
+	return v;
+}
+
+#define am_writeword(dev,off,val) __raw_writew(val, ISAMEM_BASE + ((off) << 1))
+#define am_readword(dev,off)      __raw_readw(ISAMEM_BASE + ((off) << 1))
+
+static void
+am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
+{
+	offset = ISAMEM_BASE + (offset << 1);
+	length = (length + 1) & ~1;
+	if ((int)buf & 2) {
+		asm volatile("strh	%2, [%0], #4"
+		 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
+		buf += 2;
+		length -= 2;
+	}
+	while (length > 8) {
+		register unsigned int tmp asm("r2"), tmp2 asm("r3");
+		asm volatile(
+			"ldmia	%0!, {%1, %2}"
+			: "+r" (buf), "=&r" (tmp), "=&r" (tmp2));
+		length -= 8;
+		asm volatile(
+			"strh	%1, [%0], #4\n\t"
+			"mov	%1, %1, lsr #16\n\t"
+			"strh	%1, [%0], #4\n\t"
+			"strh	%2, [%0], #4\n\t"
+			"mov	%2, %2, lsr #16\n\t"
+			"strh	%2, [%0], #4"
+		: "+r" (offset), "=&r" (tmp), "=&r" (tmp2));
+	}
+	while (length > 0) {
+		asm volatile("strh	%2, [%0], #4"
+		 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
+		buf += 2;
+		length -= 2;
+	}
+}
+
+static void
+am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
+{
+	offset = ISAMEM_BASE + (offset << 1);
+	length = (length + 1) & ~1;
+	if ((int)buf & 2) {
+		unsigned int tmp;
+		asm volatile(
+			"ldrh	%2, [%0], #4\n\t"
+			"strb	%2, [%1], #1\n\t"
+			"mov	%2, %2, lsr #8\n\t"
+			"strb	%2, [%1], #1"
+		: "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
+		length -= 2;
+	}
+	while (length > 8) {
+		register unsigned int tmp asm("r2"), tmp2 asm("r3"), tmp3;
+		asm volatile(
+			"ldrh	%2, [%0], #4\n\t"
+			"ldrh	%4, [%0], #4\n\t"
+			"ldrh	%3, [%0], #4\n\t"
+			"orr	%2, %2, %4, lsl #16\n\t"
+			"ldrh	%4, [%0], #4\n\t"
+			"orr	%3, %3, %4, lsl #16\n\t"
+			"stmia	%1!, {%2, %3}"
+		: "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
+		: "0" (offset), "1" (buf));
+		length -= 8;
+	}
+	while (length > 0) {
+		unsigned int tmp;
+		asm volatile(
+			"ldrh	%2, [%0], #4\n\t"
+			"strb	%2, [%1], #1\n\t"
+			"mov	%2, %2, lsr #8\n\t"
+			"strb	%2, [%1], #1"
+		: "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
+		length -= 2;
+	}
+}
+#else
+#error Not compatible
+#endif
+
+static int
+am79c961_ramtest(struct net_device *dev, unsigned int val)
+{
+	unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
+	int i, error = 0, errorcount = 0;
+
+	if (!buffer)
+		return 0;
+	memset (buffer, val, 65536);
+	am_writebuffer(dev, 0, buffer, 65536);
+	memset (buffer, val ^ 255, 65536);
+	am_readbuffer(dev, 0, buffer, 65536);
+	for (i = 0; i < 65536; i++) {
+		if (buffer[i] != val && !error) {
+			printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
+			error = 1;
+			errorcount ++;
+		} else if (error && buffer[i] == val) {
+			printk ("%05X\n", i);
+			error = 0;
+		}
+	}
+	if (error)
+		printk ("10000\n");
+	kfree (buffer);
+	return errorcount;
+}
+
+static void am79c961_mc_hash(char *addr, u16 *hash)
+{
+	int idx, bit;
+	u32 crc;
+
+	crc = ether_crc_le(ETH_ALEN, addr);
+
+	idx = crc >> 30;
+	bit = (crc >> 26) & 15;
+
+	hash[idx] |= 1 << bit;
+}
+
+static unsigned int am79c961_get_rx_mode(struct net_device *dev, u16 *hash)
+{
+	unsigned int mode = MODE_PORT_10BT;
+
+	if (dev->flags & IFF_PROMISC) {
+		mode |= MODE_PROMISC;
+		memset(hash, 0xff, 4 * sizeof(*hash));
+	} else if (dev->flags & IFF_ALLMULTI) {
+		memset(hash, 0xff, 4 * sizeof(*hash));
+	} else {
+		struct netdev_hw_addr *ha;
+
+		memset(hash, 0, 4 * sizeof(*hash));
+
+		netdev_for_each_mc_addr(ha, dev)
+			am79c961_mc_hash(ha->addr, hash);
+	}
+
+	return mode;
+}
+
+static void
+am79c961_init_for_open(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+	unsigned char *p;
+	u_int hdr_addr, first_free_addr;
+	u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
+	int i;
+
+	/*
+	 * Stop the chip.
+	 */
+	spin_lock_irqsave(&priv->chip_lock, flags);
+	write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
+	spin_unlock_irqrestore(&priv->chip_lock, flags);
+
+	write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
+	write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
+	write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
+	write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
+
+	for (i = LADRL; i <= LADRH; i++)
+		write_rreg (dev->base_addr, i, multi_hash[i - LADRL]);
+
+	for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
+		write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
+
+	write_rreg (dev->base_addr, MODE, mode);
+	write_rreg (dev->base_addr, POLLINT, 0);
+	write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
+	write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
+
+	first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
+	hdr_addr = 0;
+
+	priv->rxhead = 0;
+	priv->rxtail = 0;
+	priv->rxhdr = hdr_addr;
+
+	for (i = 0; i < RX_BUFFERS; i++) {
+		priv->rxbuffer[i] = first_free_addr;
+		am_writeword (dev, hdr_addr, first_free_addr);
+		am_writeword (dev, hdr_addr + 2, RMD_OWN);
+		am_writeword (dev, hdr_addr + 4, (-1600));
+		am_writeword (dev, hdr_addr + 6, 0);
+		first_free_addr += 1600;
+		hdr_addr += 8;
+	}
+	priv->txhead = 0;
+	priv->txtail = 0;
+	priv->txhdr = hdr_addr;
+	for (i = 0; i < TX_BUFFERS; i++) {
+		priv->txbuffer[i] = first_free_addr;
+		am_writeword (dev, hdr_addr, first_free_addr);
+		am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
+		am_writeword (dev, hdr_addr + 4, 0xf000);
+		am_writeword (dev, hdr_addr + 6, 0);
+		first_free_addr += 1600;
+		hdr_addr += 8;
+	}
+
+	write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
+	write_rreg (dev->base_addr, BASERXH, 0);
+	write_rreg (dev->base_addr, BASETXL, priv->txhdr);
+	write_rreg (dev->base_addr, BASERXH, 0);
+	write_rreg (dev->base_addr, CSR0, CSR0_STOP);
+	write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
+	write_rreg (dev->base_addr, CSR4, CSR4_APAD_XMIT|CSR4_MFCOM|CSR4_RCVCCOM|CSR4_TXSTRTM|CSR4_JABM);
+	write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
+}
+
+static void am79c961_timer(struct timer_list *t)
+{
+	struct dev_priv *priv = from_timer(priv, t, timer);
+	struct net_device *dev = priv->dev;
+	unsigned int lnkstat, carrier;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->chip_lock, flags);
+	lnkstat = read_ireg(dev->base_addr, ISALED0) & ISALED0_LNKST;
+	spin_unlock_irqrestore(&priv->chip_lock, flags);
+	carrier = netif_carrier_ok(dev);
+
+	if (lnkstat && !carrier) {
+		netif_carrier_on(dev);
+		printk("%s: link up\n", dev->name);
+	} else if (!lnkstat && carrier) {
+		netif_carrier_off(dev);
+		printk("%s: link down\n", dev->name);
+	}
+
+	mod_timer(&priv->timer, jiffies + msecs_to_jiffies(500));
+}
+
+/*
+ * Open/initialize the board.
+ */
+static int
+am79c961_open(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	int ret;
+
+	ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
+	if (ret)
+		return ret;
+
+	am79c961_init_for_open(dev);
+
+	netif_carrier_off(dev);
+
+	priv->timer.expires = jiffies;
+	add_timer(&priv->timer);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/*
+ * The inverse routine to am79c961_open().
+ */
+static int
+am79c961_close(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	del_timer_sync(&priv->timer);
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+
+	spin_lock_irqsave(&priv->chip_lock, flags);
+	write_rreg (dev->base_addr, CSR0, CSR0_STOP);
+	write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
+	spin_unlock_irqrestore(&priv->chip_lock, flags);
+
+	free_irq (dev->irq, dev);
+
+	return 0;
+}
+
+/*
+ * Set or clear promiscuous/multicast mode filter for this adapter.
+ */
+static void am79c961_setmulticastlist (struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+	u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
+	int i, stopped;
+
+	spin_lock_irqsave(&priv->chip_lock, flags);
+
+	stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
+
+	if (!stopped) {
+		/*
+		 * Put the chip into suspend mode
+		 */
+		write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
+
+		/*
+		 * Spin waiting for chip to report suspend mode
+		 */
+		while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
+			spin_unlock_irqrestore(&priv->chip_lock, flags);
+			nop();
+			spin_lock_irqsave(&priv->chip_lock, flags);
+		}
+	}
+
+	/*
+	 * Update the multicast hash table
+	 */
+	for (i = 0; i < ARRAY_SIZE(multi_hash); i++)
+		write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
+
+	/*
+	 * Write the mode register
+	 */
+	write_rreg(dev->base_addr, MODE, mode);
+
+	if (!stopped) {
+		/*
+		 * Put the chip back into running mode
+		 */
+		write_rreg(dev->base_addr, CTRL1, 0);
+	}
+
+	spin_unlock_irqrestore(&priv->chip_lock, flags);
+}
+
+static void am79c961_timeout(struct net_device *dev)
+{
+	printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
+		dev->name);
+
+	/*
+	 * ought to do some setup of the tx side here
+	 */
+
+	netif_wake_queue(dev);
+}
+
+/*
+ * Transmit a packet
+ */
+static netdev_tx_t
+am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	unsigned int hdraddr, bufaddr;
+	unsigned int head;
+	unsigned long flags;
+
+	head = priv->txhead;
+	hdraddr = priv->txhdr + (head << 3);
+	bufaddr = priv->txbuffer[head];
+	head += 1;
+	if (head >= TX_BUFFERS)
+		head = 0;
+
+	am_writebuffer (dev, bufaddr, skb->data, skb->len);
+	am_writeword (dev, hdraddr + 4, -skb->len);
+	am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
+	priv->txhead = head;
+
+	spin_lock_irqsave(&priv->chip_lock, flags);
+	write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
+	spin_unlock_irqrestore(&priv->chip_lock, flags);
+
+	/*
+	 * If the next packet is owned by the ethernet device,
+	 * then the tx ring is full and we can't add another
+	 * packet.
+	 */
+	if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN)
+		netif_stop_queue(dev);
+
+	dev_consume_skb_any(skb);
+
+	return NETDEV_TX_OK;
+}
+
+/*
+ * If we have a good packet(s), get it/them out of the buffers.
+ */
+static void
+am79c961_rx(struct net_device *dev, struct dev_priv *priv)
+{
+	do {
+		struct sk_buff *skb;
+		u_int hdraddr;
+		u_int pktaddr;
+		u_int status;
+		int len;
+
+		hdraddr = priv->rxhdr + (priv->rxtail << 3);
+		pktaddr = priv->rxbuffer[priv->rxtail];
+
+		status = am_readword (dev, hdraddr + 2);
+		if (status & RMD_OWN) /* do we own it? */
+			break;
+
+		priv->rxtail ++;
+		if (priv->rxtail >= RX_BUFFERS)
+			priv->rxtail = 0;
+
+		if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
+			am_writeword (dev, hdraddr + 2, RMD_OWN);
+			dev->stats.rx_errors++;
+			if (status & RMD_ERR) {
+				if (status & RMD_FRAM)
+					dev->stats.rx_frame_errors++;
+				if (status & RMD_CRC)
+					dev->stats.rx_crc_errors++;
+			} else if (status & RMD_STP)
+				dev->stats.rx_length_errors++;
+			continue;
+		}
+
+		len = am_readword(dev, hdraddr + 6);
+		skb = netdev_alloc_skb(dev, len + 2);
+
+		if (skb) {
+			skb_reserve(skb, 2);
+
+			am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
+			am_writeword(dev, hdraddr + 2, RMD_OWN);
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_rx(skb);
+			dev->stats.rx_bytes += len;
+			dev->stats.rx_packets++;
+		} else {
+			am_writeword (dev, hdraddr + 2, RMD_OWN);
+			dev->stats.rx_dropped++;
+			break;
+		}
+	} while (1);
+}
+
+/*
+ * Update stats for the transmitted packet
+ */
+static void
+am79c961_tx(struct net_device *dev, struct dev_priv *priv)
+{
+	do {
+		short len;
+		u_int hdraddr;
+		u_int status;
+
+		hdraddr = priv->txhdr + (priv->txtail << 3);
+		status = am_readword (dev, hdraddr + 2);
+		if (status & TMD_OWN)
+			break;
+
+		priv->txtail ++;
+		if (priv->txtail >= TX_BUFFERS)
+			priv->txtail = 0;
+
+		if (status & TMD_ERR) {
+			u_int status2;
+
+			dev->stats.tx_errors++;
+
+			status2 = am_readword (dev, hdraddr + 6);
+
+			/*
+			 * Clear the error byte
+			 */
+			am_writeword (dev, hdraddr + 6, 0);
+
+			if (status2 & TST_RTRY)
+				dev->stats.collisions += 16;
+			if (status2 & TST_LCOL)
+				dev->stats.tx_window_errors++;
+			if (status2 & TST_LCAR)
+				dev->stats.tx_carrier_errors++;
+			if (status2 & TST_UFLO)
+				dev->stats.tx_fifo_errors++;
+			continue;
+		}
+		dev->stats.tx_packets++;
+		len = am_readword (dev, hdraddr + 4);
+		dev->stats.tx_bytes += -len;
+	} while (priv->txtail != priv->txhead);
+
+	netif_wake_queue(dev);
+}
+
+static irqreturn_t
+am79c961_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct dev_priv *priv = netdev_priv(dev);
+	u_int status, n = 100;
+	int handled = 0;
+
+	do {
+		status = read_rreg(dev->base_addr, CSR0);
+		write_rreg(dev->base_addr, CSR0, status &
+			   (CSR0_IENA|CSR0_TINT|CSR0_RINT|
+			    CSR0_MERR|CSR0_MISS|CSR0_CERR|CSR0_BABL));
+
+		if (status & CSR0_RINT) {
+			handled = 1;
+			am79c961_rx(dev, priv);
+		}
+		if (status & CSR0_TINT) {
+			handled = 1;
+			am79c961_tx(dev, priv);
+		}
+		if (status & CSR0_MISS) {
+			handled = 1;
+			dev->stats.rx_dropped++;
+		}
+		if (status & CSR0_CERR) {
+			handled = 1;
+			mod_timer(&priv->timer, jiffies);
+		}
+	} while (--n && status & (CSR0_RINT | CSR0_TINT));
+
+	return IRQ_RETVAL(handled);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void am79c961_poll_controller(struct net_device *dev)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	am79c961_interrupt(dev->irq, dev);
+	local_irq_restore(flags);
+}
+#endif
+
+/*
+ * Initialise the chip.  Note that we always expect
+ * to be entered with interrupts enabled.
+ */
+static int
+am79c961_hw_init(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+
+	spin_lock_irq(&priv->chip_lock);
+	write_rreg (dev->base_addr, CSR0, CSR0_STOP);
+	write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
+	spin_unlock_irq(&priv->chip_lock);
+
+	am79c961_ramtest(dev, 0x66);
+	am79c961_ramtest(dev, 0x99);
+
+	return 0;
+}
+
+static void __init am79c961_banner(void)
+{
+	static unsigned version_printed;
+
+	if (net_debug && version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+}
+static const struct net_device_ops am79c961_netdev_ops = {
+	.ndo_open		= am79c961_open,
+	.ndo_stop		= am79c961_close,
+	.ndo_start_xmit		= am79c961_sendpacket,
+	.ndo_set_rx_mode	= am79c961_setmulticastlist,
+	.ndo_tx_timeout		= am79c961_timeout,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= am79c961_poll_controller,
+#endif
+};
+
+static int am79c961_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct net_device *dev;
+	struct dev_priv *priv;
+	int i, ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -ENODEV;
+
+	dev = alloc_etherdev(sizeof(struct dev_priv));
+	ret = -ENOMEM;
+	if (!dev)
+		goto out;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	priv = netdev_priv(dev);
+
+	/*
+	 * Fixed address and IRQ lines here.
+	 * The PNP initialisation should have been
+	 * done by the ether bootp loader.
+	 */
+	dev->base_addr = res->start;
+	ret = platform_get_irq(pdev, 0);
+
+	if (ret < 0) {
+		ret = -ENODEV;
+		goto nodev;
+	}
+	dev->irq = ret;
+
+	ret = -ENODEV;
+	if (!request_region(dev->base_addr, 0x18, dev->name))
+		goto nodev;
+
+	/*
+	 * Reset the device.
+	 */
+	inb(dev->base_addr + NET_RESET);
+	udelay(5);
+
+	/*
+	 * Check the manufacturer part of the
+	 * ether address.
+	 */
+	if (inb(dev->base_addr) != 0x08 ||
+	    inb(dev->base_addr + 2) != 0x00 ||
+	    inb(dev->base_addr + 4) != 0x2b)
+	    	goto release;
+
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = inb(dev->base_addr + i * 2) & 0xff;
+
+	am79c961_banner();
+
+	spin_lock_init(&priv->chip_lock);
+	priv->dev = dev;
+	timer_setup(&priv->timer, am79c961_timer, 0);
+
+	if (am79c961_hw_init(dev))
+		goto release;
+
+	dev->netdev_ops = &am79c961_netdev_ops;
+
+	ret = register_netdev(dev);
+	if (ret == 0) {
+		printk(KERN_INFO "%s: ether address %pM\n",
+		       dev->name, dev->dev_addr);
+		return 0;
+	}
+
+release:
+	release_region(dev->base_addr, 0x18);
+nodev:
+	free_netdev(dev);
+out:
+	return ret;
+}
+
+static struct platform_driver am79c961_driver = {
+	.probe		= am79c961_probe,
+	.driver		= {
+		.name	= "am79c961",
+	},
+};
+
+static int __init am79c961_init(void)
+{
+	return platform_driver_register(&am79c961_driver);
+}
+
+__initcall(am79c961_init);