Subject: [PATCH] ASIX AX88796 10/100 network driver

From: Ben Dooks <[email-masked]>
Date: Fri, 11 May 2007 13:33:57 +0100

This patch adds support for the ASIX AX88796
10/100 network controller. This device is an
NE2000 compatible chip, with a 10/100 phy.

The driver attaches via the platform bus,
and takes platform data specified in the
<net/ax88796.h> include file to allow the
chip to be configured. It fully supports
devices where the address bus is not an 1:1
map.

Control of the phy is provided via an ethtool
or ioctl interface.

To properly configure the chip, the driver
patches 8390.h to add a default rcr to the
ei_device structure (dependant on the
presence of AX88796_PLATFORM)

The driver has been tested on an Simtec BAST
and several Simtec development boards. 

Signed-off-by: Ben Dooks <[email-masked]>

diff -urNp linux-2.6.21-git14/drivers/net/8390.h linux-2.6.21-git14-ax88796/drivers/net/8390.h
--- linux-2.6.21-git14/drivers/net/8390.h	2007-05-10 13:41:19.000000000 +0100
+++ linux-2.6.21-git14-ax88796/drivers/net/8390.h	2007-05-11 12:16:24.000000000 +0100
@@ -73,6 +73,9 @@ struct ei_device {
 	u32 *reg_offset;		/* Register mapping table */
 	spinlock_t page_lock;		/* Page register locks */
 	unsigned long priv;		/* Private field to store bus IDs etc. */
+#ifdef AX88796_PLATFORM
+	unsigned char rxcr_base;	/* default value for RXCR */
+#endif
 };
 
 /* The maximum number of 8390 interrupt service routines called per IRQ. */
@@ -86,11 +89,19 @@ struct ei_device {
 /* Some generic ethernet register configurations. */
 #define E8390_TX_IRQ_MASK	0xa	/* For register EN0_ISR */
 #define E8390_RX_IRQ_MASK	0x5
+
+#ifdef AX88796_PLATFORM
+#define E8390_RXCONFIG		(ei_status.rxcr_base | 0x04)
+#define E8390_RXOFF		(ei_status.rxcr_base | 0x20)
+#else
 #define E8390_RXCONFIG		0x4	/* EN0_RXCR: broadcasts, no multicast,errors */
 #define E8390_RXOFF		0x20	/* EN0_RXCR: Accept no packets */
+#endif
+
 #define E8390_TXCONFIG		0x00	/* EN0_TXCR: Normal transmit mode */
 #define E8390_TXOFF		0x02	/* EN0_TXCR: Transmitter off */
 
+
 /*  Register accessed at EN_CMD, the 8390 base addr.  */
 #define E8390_STOP	0x01	/* Stop and reset the chip */
 #define E8390_START	0x02	/* Start the chip, clear reset */
diff -urNp linux-2.6.21-git14/drivers/net/ax88796.c linux-2.6.21-git14-ax88796/drivers/net/ax88796.c
--- linux-2.6.21-git14/drivers/net/ax88796.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21-git14-ax88796/drivers/net/ax88796.c	2007-05-11 12:16:48.000000000 +0100
@@ -0,0 +1,952 @@
+/* drivers/net/ax88796.c
+ *
+ * Copyright 2005,2007 Simtec Electronics
+ *	Ben Dooks <[email-masked]>
+ *
+ * Asix AX88796 10/100 Ethernet controller support
+ *	Based on ne.c, by Donald Becker, et-al.
+ *
+ * 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.
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/isapnp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+
+#include <net/ax88796.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+
+static int phy_debug = 0;
+
+/* Rename the lib8390.c functions to show that they are in this driver */
+#define __ei_open       ax_ei_open
+#define __ei_close      ax_ei_close
+#define __ei_poll	ax_ei_poll
+#define __ei_tx_timeout ax_ei_tx_timeout
+#define __ei_interrupt  ax_ei_interrupt
+#define ____alloc_ei_netdev ax__alloc_ei_netdev
+#define __NS8390_init   ax_NS8390_init
+
+/* force unsigned long back to 'void __iomem *' */
+#define ax_convert_addr(_a) ((void __force __iomem *)(_a))
+
+#define ei_inb(_a)	readb(ax_convert_addr(_a))
+#define ei_outb(_v, _a) writeb(_v, ax_convert_addr(_a))
+
+#define ei_inb_p(_a)	ei_inb(_a)
+#define ei_outb_p(_v, _a) ei_outb(_v, _a)
+
+/* define EI_SHIFT() to take into account our register offsets */
+#define EI_SHIFT(x)     (ei_local->reg_offset[(x)])
+
+/* Ensure we have our RCR base value */
+#define AX88796_PLATFORM
+
+static unsigned char version[] = "ax88796.c: Copyright 2005,2007 Simtec Electronics\n";
+
+#include "lib8390.c"
+
+#define DRV_NAME "ax88796"
+#define DRV_VERSION "1.00"
+
+/* from ne.c */
+#define NE_CMD		EI_SHIFT(0x00)
+#define NE_RESET	EI_SHIFT(0x1f)
+#define NE_DATAPORT	EI_SHIFT(0x10)
+
+#define NE1SM_START_PG	0x20	/* First page of TX buffer */
+#define NE1SM_STOP_PG 	0x40	/* Last page +1 of RX ring */
+#define NESM_START_PG	0x40	/* First page of TX buffer */
+#define NESM_STOP_PG	0x80	/* Last page +1 of RX ring */
+
+/* device private data */
+
+struct ax_device {
+	struct timer_list	 mii_timer;
+	spinlock_t		 mii_lock;
+	struct mii_if_info	 mii;
+
+	u32			 msg_enable;
+	void __iomem		*map2;
+	struct platform_device	*dev;
+	struct resource		*mem;
+	struct resource		*mem2;
+	struct ax_plat_data	*plat;
+
+	unsigned char		 running;
+	unsigned char		 resume_open;
+
+	u32			 reg_offsets[0x20];
+};
+
+static inline struct ax_device *to_ax_dev(struct net_device *dev)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	return (struct ax_device *)(ei_local+1);
+}
+
+/* ax_initial_check
+ *
+ * do an initial probe for the card to check wether it exists
+ * and is functional
+ */
+
+static int ax_initial_check(struct net_device *dev)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *ioaddr = ei_local->mem;
+	int reg0;
+	int regd;
+
+	reg0 = ei_inb(ioaddr);
+	if (reg0 == 0xFF)
+		return -ENODEV;
+
+	ei_outb(E8390_NODMA+E8390_PAGE1+E8390_STOP, ioaddr + E8390_CMD);
+	regd = ei_inb(ioaddr + 0x0d);
+	ei_outb(0xff, ioaddr + 0x0d);
+	ei_outb(E8390_NODMA+E8390_PAGE0, ioaddr + E8390_CMD);
+	ei_inb(ioaddr + EN0_COUNTER0); /* Clear the counter by reading. */
+	if (ei_inb(ioaddr + EN0_COUNTER0) != 0) {
+		ei_outb(reg0, ioaddr);
+		ei_outb(regd, ioaddr + 0x0d);	/* Restore the old values. */
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/* Hard reset the card.  This used to pause for the same period that a
+   8390 reset command required, but that shouldn't be necessary. */
+
+static void ax_reset_8390(struct net_device *dev)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	unsigned long reset_start_time = jiffies;
+	void __iomem *addr = (void __iomem *)dev->base_addr;
+
+	if (ei_debug > 1)
+		printk(KERN_DEBUG "resetting the 8390 t=%ld...", jiffies);
+
+	ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET);
+
+	ei_status.txing = 0;
+	ei_status.dmaing = 0;
+
+	/* This check _should_not_ be necessary, omit eventually. */
+	while ((ei_inb(addr + EN0_ISR) & ENISR_RESET) == 0) {
+		if (jiffies - reset_start_time > 2*HZ/100) {
+			printk(KERN_WARNING "%s: %s did not complete.\n",
+			       __FUNCTION__, dev->name);
+			break;
+		}
+	}
+
+	ei_outb(ENISR_RESET, addr + EN0_ISR);	/* Ack intr. */
+}
+
+
+static void ax_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
+			    int ring_page)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *nic_base = ei_local->mem;
+
+	/* This *shouldn't* happen. If it does, it's the last thing you'll see */
+	if (ei_status.dmaing) {
+		printk(KERN_EMERG "%s: DMAing conflict in %s [DMAstat:%d][irqlock:%d].\n",
+			dev->name, __FUNCTION__,
+		       ei_status.dmaing, ei_status.irqlock);
+		return;
+	}
+
+	ei_status.dmaing |= 0x01;
+	ei_outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
+	ei_outb(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
+	ei_outb(0, nic_base + EN0_RCNTHI);
+	ei_outb(0, nic_base + EN0_RSARLO);		/* On page boundary */
+	ei_outb(ring_page, nic_base + EN0_RSARHI);
+	ei_outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
+
+	if (ei_status.word16)
+		readsw(nic_base + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
+	else
+		readsb(nic_base + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr));
+
+	ei_outb(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
+	ei_status.dmaing &= ~0x01;
+
+	le16_to_cpus(&hdr->count);
+}
+
+
+/* Block input and output, similar to the Crynwr packet driver.  If you
+   are porting to a new ethercard, look at the packet driver source for hints.
+   The NEx000 doesn't share the on-board packet memory -- you have to put
+   the packet out through the "remote DMA" dataport using ei_outb. */
+
+static void ax_block_input(struct net_device *dev, int count,
+			   struct sk_buff *skb, int ring_offset)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *nic_base = ei_local->mem;
+	char *buf = skb->data;
+
+	if (ei_status.dmaing) {
+		printk(KERN_EMERG "%s: DMAing conflict in ax_block_input "
+			"[DMAstat:%d][irqlock:%d].\n",
+			dev->name, ei_status.dmaing, ei_status.irqlock);
+		return;
+	}
+
+	ei_status.dmaing |= 0x01;
+
+	ei_outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
+	ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
+	ei_outb(count >> 8, nic_base + EN0_RCNTHI);
+	ei_outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
+	ei_outb(ring_offset >> 8, nic_base + EN0_RSARHI);
+	ei_outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
+
+	if (ei_status.word16) {
+		readsw(nic_base + NE_DATAPORT, buf, count >> 1);
+		if (count & 0x01)
+			buf[count-1] = ei_inb(nic_base + NE_DATAPORT);
+
+	} else {
+		readsb(nic_base + NE_DATAPORT, buf, count);
+	}
+
+	ei_status.dmaing &= ~1;
+}
+
+static void ax_block_output(struct net_device *dev, int count,
+			    const unsigned char *buf, const int start_page)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *nic_base = ei_local->mem;
+	unsigned long dma_start;
+
+	/* Round the count up for word writes.  Do we need to do this?
+	   What effect will an odd byte count have on the 8390?
+	   I should check someday. */
+
+	if (ei_status.word16 && (count & 0x01))
+		count++;
+
+	/* This *shouldn't* happen. If it does, it's the last thing you'll see */
+	if (ei_status.dmaing) {
+		printk(KERN_EMERG "%s: DMAing conflict in %s."
+			"[DMAstat:%d][irqlock:%d]\n",
+			dev->name, __FUNCTION__,
+		       ei_status.dmaing, ei_status.irqlock);
+		return;
+	}
+
+	ei_status.dmaing |= 0x01;
+	/* We should already be in page 0, but to be safe... */
+	ei_outb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);
+
+	ei_outb(ENISR_RDC, nic_base + EN0_ISR);
+
+	/* Now the normal output. */
+	ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
+	ei_outb(count >> 8,   nic_base + EN0_RCNTHI);
+	ei_outb(0x00, nic_base + EN0_RSARLO);
+	ei_outb(start_page, nic_base + EN0_RSARHI);
+
+	ei_outb(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
+	if (ei_status.word16) {
+		writesw(nic_base + NE_DATAPORT, buf, count>>1);
+	} else {
+		writesb(nic_base + NE_DATAPORT, buf, count);
+	}
+
+	dma_start = jiffies;
+
+	while ((ei_inb(nic_base + EN0_ISR) & ENISR_RDC) == 0) {
+		if (jiffies - dma_start > 2*HZ/100) {		/* 20ms */
+			printk(KERN_WARNING "%s: timeout waiting for Tx RDC.\n", dev->name);
+			ax_reset_8390(dev);
+			ax_NS8390_init(dev,1);
+			break;
+		}
+	}
+
+	ei_outb(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
+	ei_status.dmaing &= ~0x01;
+	return;
+}
+
+/* definitions for accessing MII/EEPROM interface */
+
+#define AX_MEMR			EI_SHIFT(0x14)
+#define AX_MEMR_MDC		(1<<0)
+#define AX_MEMR_MDIR		(1<<1)
+#define AX_MEMR_MDI		(1<<2)
+#define AX_MEMR_MDO		(1<<3)
+#define AX_MEMR_EECS		(1<<4)
+#define AX_MEMR_EEI		(1<<5)
+#define AX_MEMR_EEO		(1<<6)
+#define AX_MEMR_EECLK		(1<<7)
+
+/* ax_mii_ei_outbits
+ *
+ * write the specified set of bits to the phy
+*/
+
+static void
+ax_mii_ei_outbits(struct net_device *dev, unsigned int bits, int len)
+{
+	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
+	void __iomem *memr_addr = (void __iomem *)dev->base_addr + AX_MEMR;
+	unsigned int memr;
+
+	/* clock low, data to output mode */
+	memr = ei_inb(memr_addr);
+	memr &= ~(AX_MEMR_MDC | AX_MEMR_MDIR);
+	ei_outb(memr, memr_addr);
+
+	for (len--; len >= 0; len--) {
+		if (bits & (1 << len))
+			memr |= AX_MEMR_MDO;
+		else
+			memr &= ~AX_MEMR_MDO;
+
+		ei_outb(memr, memr_addr);
+
+		/* clock high */
+
+		ei_outb(memr | AX_MEMR_MDC, memr_addr);
+		udelay(1);
+
+		/* clock low */
+		ei_outb(memr, memr_addr);
+	}
+
+	/* leaves the clock line low, mdir input */
+	memr |= AX_MEMR_MDIR;
+	ei_outb(memr, (void __iomem *)dev->base_addr + AX_MEMR);
+}
+
+/* ax_phy_ei_inbits
+ *
+ * read a specified number of bits from the phy
+*/
+
+static unsigned int
+ax_phy_ei_inbits(struct net_device *dev, int no)
+{
+	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
+	void __iomem *memr_addr = (void __iomem *)dev->base_addr + AX_MEMR;
+	unsigned int memr;
+	unsigned int result = 0;
+
+	/* clock low, data to input mode */
+	memr = ei_inb(memr_addr);
+	memr &= ~AX_MEMR_MDC;
+	memr |= AX_MEMR_MDIR;
+	ei_outb(memr, memr_addr);
+
+	for (no--; no >= 0; no--) {
+		ei_outb(memr | AX_MEMR_MDC, memr_addr);
+
+		udelay(1);
+
+		if (ei_inb(memr_addr) & AX_MEMR_MDI)
+			result |= (1<<no);
+
+		ei_outb(memr, memr_addr);
+	}
+
+	return result;
+}
+
+/* ax_phy_issueaddr
+ *
+ * use the low level bit shifting routines to send the address
+ * and command to the specified phy
+*/
+
+static void
+ax_phy_issueaddr(struct net_device *dev, int phy_addr, int reg, int opc)
+{
+	if (phy_debug)
+		pr_debug("%s: dev %p, %04x, %04x, %d\n",
+			__FUNCTION__, dev, phy_addr, reg, opc);
+
+	ax_mii_ei_outbits(dev, 0x3f, 6);	/* pre-amble */
+	ax_mii_ei_outbits(dev, 1, 2);		/* frame-start */
+	ax_mii_ei_outbits(dev, opc, 2);		/* op code */
+	ax_mii_ei_outbits(dev, phy_addr, 5);	/* phy address */
+	ax_mii_ei_outbits(dev, reg, 5);		/* reg address */
+}
+
+static int
+ax_phy_read(struct net_device *dev, int phy_addr, int reg)
+{
+	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
+	unsigned long flags;
+ 	unsigned int result;
+
+      	spin_lock_irqsave(&ei_local->page_lock, flags);
+
+	ax_phy_issueaddr(dev, phy_addr, reg, 2);
+
+	result = ax_phy_ei_inbits(dev, 17);
+	result &= ~(3<<16);
+
+      	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+
+	if (phy_debug)
+		pr_debug("%s: %04x.%04x => read %04x\n", __FUNCTION__,
+			 phy_addr, reg, result);
+
+	return result;
+}
+
+static void
+ax_phy_write(struct net_device *dev, int phy_addr, int reg, int value)
+{
+	struct ei_device *ei = (struct ei_device *) netdev_priv(dev);
+	unsigned long flags;
+
+	printk(KERN_DEBUG "%s: %p, %04x, %04x %04x\n",
+	       __FUNCTION__, dev, phy_addr, reg, value);
+
+      	spin_lock_irqsave(&ei->page_lock, flags);
+
+	ax_phy_issueaddr(dev, phy_addr, reg, 1);
+	ax_mii_ei_outbits(dev, 2, 2);		/* send TA */
+	ax_mii_ei_outbits(dev, value, 16);
+
+      	spin_unlock_irqrestore(&ei->page_lock, flags);
+}
+
+static void ax_mii_expiry(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct ax_device  *ax = to_ax_dev(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&ax->mii_lock, flags);
+	mii_check_media(&ax->mii, netif_msg_link(ax), 0);
+	spin_unlock_irqrestore(&ax->mii_lock, flags);
+
+	if (ax->running) {
+		ax->mii_timer.expires = jiffies + HZ*2;
+		add_timer(&ax->mii_timer);
+	}
+}
+
+static int ax_open(struct net_device *dev)
+{
+	struct ax_device  *ax = to_ax_dev(dev);
+	struct ei_device *ei_local = netdev_priv(dev);
+	int ret;
+
+	dev_dbg(ax->dev, "%s: open\n", dev->name);
+
+	ret = request_irq(dev->irq, ax_ei_interrupt, 0, dev->name, dev);
+	if (ret)
+		return ret;
+
+	ret = ax_ei_open(dev);
+	if (ret)
+		return ret;
+
+	/* turn the phy on (if turned off) */
+
+	ei_outb(ax->plat->gpoc_val, ei_local->mem + EI_SHIFT(0x17));
+	ax->running = 1;
+
+	/* start the MII timer */
+
+	init_timer(&ax->mii_timer);
+
+	ax->mii_timer.expires  = jiffies+1;
+	ax->mii_timer.data     = (unsigned long) dev;
+	ax->mii_timer.function = ax_mii_expiry;
+
+	add_timer(&ax->mii_timer);
+
+	return 0;
+}
+
+static int ax_close(struct net_device *dev)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	struct ei_device *ei_local = netdev_priv(dev);
+
+	dev_dbg(ax->dev, "%s: close\n", dev->name);
+
+	/* turn the phy off */
+
+	ei_outb(ax->plat->gpoc_val | (1<<6),
+	       ei_local->mem + EI_SHIFT(0x17));
+
+	ax->running = 0;
+	wmb();
+
+	del_timer_sync(&ax->mii_timer);
+	ax_ei_close(dev);
+
+	free_irq(dev->irq, dev);
+	return 0;
+}
+
+static int ax_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	unsigned long flags;
+	int rc;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	spin_lock_irqsave(&ax->mii_lock, flags);
+	rc = generic_mii_ioctl(&ax->mii, if_mii(req), cmd, NULL);
+	spin_unlock_irqrestore(&ax->mii_lock, flags);
+
+	return rc;
+}
+
+/* ethtool ops */
+
+static void ax_get_drvinfo(struct net_device *dev,
+			   struct ethtool_drvinfo *info)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+
+	strcpy(info->driver, DRV_NAME);
+	strcpy(info->version, DRV_VERSION);
+	strcpy(info->bus_info, ax->dev->name);
+}
+
+static int ax_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&ax->mii_lock, flags);
+	mii_ethtool_gset(&ax->mii, cmd);
+	spin_lock_irqsave(&ax->mii_lock, flags);
+
+	return 0;
+}
+
+static int ax_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(&ax->mii_lock, flags);
+	rc = mii_ethtool_sset(&ax->mii, cmd);
+	spin_lock_irqsave(&ax->mii_lock, flags);
+
+	return rc;
+}
+
+static int ax_nway_reset(struct net_device *dev)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	return mii_nway_restart(&ax->mii);
+}
+
+static u32 ax_get_link(struct net_device *dev)
+{
+	struct ax_device *ax = to_ax_dev(dev);
+	return mii_link_ok(&ax->mii);
+}
+
+static const struct ethtool_ops ax_ethtool_ops = {
+	.get_drvinfo		= ax_get_drvinfo,
+	.get_settings		= ax_get_settings,
+	.set_settings		= ax_set_settings,
+	.nway_reset		= ax_nway_reset,
+	.get_link		= ax_get_link,
+	.get_perm_addr		= ethtool_op_get_perm_addr,
+};
+
+/* setup code */
+
+static void ax_initial_setup(struct net_device *dev, struct ei_device *ei_local)
+{
+	void __iomem *ioaddr = ei_local->mem;
+	struct ax_device *ax = to_ax_dev(dev);
+
+	/* Select page 0*/
+	ei_outb(E8390_NODMA+E8390_PAGE0+E8390_STOP, ioaddr + E8390_CMD);
+
+	/* set to byte access */
+	ei_outb(ax->plat->dcr_val & ~1, ioaddr + EN0_DCFG);
+	ei_outb(ax->plat->gpoc_val, ioaddr + EI_SHIFT(0x17));
+}
+
+/* ax_init_dev
+ *
+ * initialise the specified device, taking care to note the MAC
+ * address it may already have (if configured), ensure
+ * the device is ready to be used by lib8390.c and registerd with
+ * the network layer.
+ */
+
+static int ax_init_dev(struct net_device *dev, int first_init)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	struct ax_device *ax = to_ax_dev(dev);
+	void __iomem *ioaddr = ei_local->mem;
+	unsigned int start_page;
+	unsigned int stop_page;
+	int ret;
+	int i;
+
+	ret = ax_initial_check(dev);
+	if (ret)
+		goto err_out;
+
+	/* setup goes here */
+
+	ax_initial_setup(dev, ei_local);
+
+	/* read the mac from the card prom if we need it */
+
+	if (first_init && ax->plat->flags & AXFLG_HAS_EEPROM) {
+		unsigned char SA_prom[32];
+
+		for(i = 0; i < sizeof(SA_prom); i+=2) {
+			SA_prom[i] = ei_inb(ioaddr + NE_DATAPORT);
+			SA_prom[i+1] = ei_inb(ioaddr + NE_DATAPORT);
+		}
+
+		if (ax->plat->wordlength == 2)
+			for (i = 0; i < 16; i++)
+				SA_prom[i] = SA_prom[i+i];
+
+		memcpy(dev->dev_addr,  SA_prom, 6);
+	}
+
+	if (ax->plat->wordlength == 2) {
+		/* We must set the 8390 for word mode. */
+		ei_outb(ax->plat->dcr_val, ei_local->mem + EN0_DCFG);
+		start_page = NESM_START_PG;
+		stop_page = NESM_STOP_PG;
+	} else {
+		start_page = NE1SM_START_PG;
+		stop_page = NE1SM_STOP_PG;
+	}
+
+	/* load the mac-address from the device if this is the
+	 * first time we've initialised */
+
+	if (first_init && ax->plat->flags & AXFLG_MAC_FROMDEV) {
+		ei_outb(E8390_NODMA + E8390_PAGE1 + E8390_STOP,
+			ei_local->mem + E8390_CMD); /* 0x61 */
+
+		for (i = 0 ; i < ETHER_ADDR_LEN ; i++)
+			dev->dev_addr[i] = ei_inb(ioaddr + EN1_PHYS_SHIFT(i));
+	}
+
+	ax_reset_8390(dev);
+
+	ei_status.name = "AX88796";
+	ei_status.tx_start_page = start_page;
+	ei_status.stop_page = stop_page;
+	ei_status.word16 = (ax->plat->wordlength == 2);
+	ei_status.rx_start_page = start_page + TX_PAGES;
+
+#ifdef PACKETBUF_MEMSIZE
+	 /* Allow the packet buffer size to be overridden by know-it-alls. */
+	ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
+#endif
+
+	ei_status.reset_8390	= &ax_reset_8390;
+	ei_status.block_input	= &ax_block_input;
+	ei_status.block_output	= &ax_block_output;
+	ei_status.get_8390_hdr	= &ax_get_8390_hdr;
+	ei_status.priv = 0;
+
+	dev->open		= ax_open;
+	dev->stop		= ax_close;
+	dev->do_ioctl		= ax_ioctl;
+	dev->ethtool_ops	= &ax_ethtool_ops;
+
+	ax->msg_enable		= NETIF_MSG_LINK;
+	ax->mii.phy_id_mask	= 0x1f;
+	ax->mii.reg_num_mask	= 0x1f;
+	ax->mii.phy_id		= 0x10;		/* onboard phy */
+	ax->mii.force_media	= 0;
+	ax->mii.full_duplex	= 0;
+	ax->mii.mdio_read	= ax_phy_read;
+	ax->mii.mdio_write	= ax_phy_write;
+	ax->mii.dev		= dev;
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ax_ei_poll;
+#endif
+	ax_NS8390_init(dev, 0);
+
+	if (first_init) {
+		printk("AX88796: %dbit, irq %d, %lx, MAC: ",
+		       ei_status.word16 ? 16:8, dev->irq, dev->base_addr);
+
+		for (i = 0; i < ETHER_ADDR_LEN; i++)
+			printk("%2.2x%c", dev->dev_addr[i],
+			       (i < (ETHER_ADDR_LEN-1) ? ':' : ' '));
+
+		printk("\n");
+	}
+
+	ret = register_netdev(dev);
+	if (ret)
+		goto out_irq;
+
+	return 0;
+
+ out_irq:
+	/* cleanup irq */
+	free_irq(dev->irq, dev);
+ err_out:
+	return ret;
+}
+
+static int ax_remove(struct platform_device *_dev)
+{
+	struct net_device *dev = platform_get_drvdata(_dev);
+	struct ax_device  *ax;
+
+	ax = to_ax_dev(dev);
+
+	unregister_netdev(dev);
+	free_irq(dev->irq, dev);
+
+	iounmap(ei_status.mem);
+	release_resource(ax->mem);
+	kfree(ax->mem);
+
+	if (ax->map2) {
+		iounmap(ax->map2);
+		release_resource(ax->mem2);
+		kfree(ax->mem2);
+	}
+
+	free_netdev(dev);
+
+	return 0;
+}
+
+/* ax_probe
+ *
+ * This is the entry point when the platform device system uses to
+ * notify us of a new device to attach to. Allocate memory, find
+ * the resources and information passed, and map the necessary registers.
+*/
+
+static int ax_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct ax_device  *ax;
+	struct resource   *res;
+	size_t size;
+	int ret;
+
+	dev = ax__alloc_ei_netdev(sizeof(struct ax_device));
+	if (dev == NULL)
+		return -ENOMEM;
+
+	/* ok, let's setup our device */
+	ax = to_ax_dev(dev);
+
+	memset(ax, 0, sizeof(struct ax_device));
+
+	spin_lock_init(&ax->mii_lock);
+
+	ax->dev = pdev;
+	ax->plat = pdev->dev.platform_data;
+	platform_set_drvdata(pdev, dev);
+
+	ei_status.rxcr_base  = ax->plat->rcr_val;
+
+	/* find the platform resources */
+
+	dev->irq  = platform_get_irq(pdev, 0);
+	if (dev->irq < 0) {
+		dev_err(&pdev->dev, "no IRQ specified\n");
+		ret = -ENXIO;
+		goto exit_mem;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "no MEM specified\n");
+		ret = -ENXIO;
+		goto exit_mem;
+	}
+
+	size = (res->end - res->start) + 1;
+
+	/* setup the register offsets from either the platform data
+	 * or by using the size of the resource provided */
+
+	if (ax->plat->reg_offsets)
+		ei_status.reg_offset = ax->plat->reg_offsets;
+	else {
+		ei_status.reg_offset = ax->reg_offsets;
+		for (ret = 0; ret < 0x18; ret++)
+			ax->reg_offsets[ret] = (size / 0x18) * ret;
+	}
+
+	ax->mem = request_mem_region(res->start, size, pdev->name);
+	if (ax->mem == NULL) {
+		dev_err(&pdev->dev, "cannot reserve registers\n");
+ 		ret = -ENXIO;
+		goto exit_mem;
+	}
+
+	ei_status.mem = ioremap(res->start, size);
+	dev->base_addr = (long)ei_status.mem;
+
+	if (ei_status.mem == NULL) {
+		dev_err(&pdev->dev, "Cannot ioremap area (%08zx,%08zx)\n",
+			res->start, res->end);
+
+ 		ret = -ENXIO;
+		goto exit_req;
+	}
+
+	/* look for reset area */
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res == NULL) {
+		if (!ax->plat->reg_offsets) {
+			for (ret = 0; ret < 0x20; ret++)
+				ax->reg_offsets[ret] = (size / 0x20) * ret;
+		}
+
+		ax->map2 = NULL;
+	} else {
+ 		size = (res->end - res->start) + 1;
+
+		ax->mem2 = request_mem_region(res->start, size, pdev->name);
+		if (ax->mem == NULL) {
+			dev_err(&pdev->dev, "cannot reserve registers\n");
+			ret = -ENXIO;
+			goto exit_mem1;
+		}
+
+		ax->map2 = ioremap(res->start, size);
+		if (ax->map2 == NULL) {
+			dev_err(&pdev->dev, "cannot map reset register");
+			ret = -ENXIO;
+			goto exit_mem2;
+		}
+
+		ei_status.reg_offset[0x1f] = ax->map2 - ei_status.mem;
+	}
+
+	/* got resources, now initialise and register device */
+
+	ret = ax_init_dev(dev, 1);
+	if (!ret)
+		return 0;
+
+	if (ax->map2 == NULL)
+		goto exit_mem1;
+
+	iounmap(ax->map2);
+
+ exit_mem2:
+	release_resource(ax->mem2);
+	kfree(ax->mem2);
+
+ exit_mem1:
+	iounmap(ei_status.mem);
+
+ exit_req:
+	release_resource(ax->mem);
+	kfree(ax->mem);
+
+ exit_mem:
+	free_netdev(dev);
+
+	return ret;
+}
+
+/* suspend and resume */
+
+#ifdef CONFIG_PM
+static int ax_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct net_device *ndev = platform_get_drvdata(dev);
+	struct ax_device  *ax = to_ax_dev(ndev);
+
+	ax->resume_open = ax->running;
+
+	netif_device_detach(ndev);
+	ax_close(ndev);
+
+	return 0;
+}
+
+static int ax_resume(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct ax_device  *ax = to_ax_dev(ndev);
+
+	ax_initial_setup(ndev, netdev_priv(ndev));
+	ax_NS8390_init(ndev, ax->resume_open);
+	netif_device_attach(ndev);
+
+	if (ax->resume_open)
+		ax_open(ndev);
+
+	return 0;
+}
+
+#else
+#define ax_suspend NULL
+#define ax_resume  NULL
+#endif
+
+static struct platform_driver axdrv = {
+	.driver	= {
+		.name		= "ax88796",
+		.owner		= THIS_MODULE,
+	},
+	.probe		= ax_probe,
+	.remove		= ax_remove,
+	.suspend	= ax_suspend,
+	.resume		= ax_resume,
+};
+
+static int __init axdrv_init(void)
+{
+	return platform_driver_register(&axdrv);
+}
+
+static void __exit axdrv_exit(void)
+{
+	platform_driver_unregister(&axdrv);
+}
+
+module_init(axdrv_init);
+module_exit(axdrv_exit);
+
+MODULE_DESCRIPTION("AX88796 10/100 Ethernet platform driver");
+MODULE_AUTHOR("Ben Dooks, <[email-masked]>");
+MODULE_LICENSE("GPLv2");
diff -urNp linux-2.6.21-git14/drivers/net/Kconfig linux-2.6.21-git14-ax88796/drivers/net/Kconfig
--- linux-2.6.21-git14/drivers/net/Kconfig	2007-05-11 12:13:21.000000000 +0100
+++ linux-2.6.21-git14-ax88796/drivers/net/Kconfig	2007-05-11 12:16:24.000000000 +0100
@@ -201,6 +201,14 @@ config MACB
 
 source "drivers/net/arm/Kconfig"
 
+config AX88796
+	tristate "ASIX AX88796 NE2000 clone support"
+	select CRC32
+	select MII
+	help
+	  AX88796 driver, using platform bus to provide
+	  chip detection and resources
+
 config MACE
 	tristate "MACE (Power Mac ethernet) support"
 	depends on NET_ETHERNET && PPC_PMAC && PPC32
diff -urNp linux-2.6.21-git14/drivers/net/Makefile linux-2.6.21-git14-ax88796/drivers/net/Makefile
--- linux-2.6.21-git14/drivers/net/Makefile	2007-05-11 12:13:21.000000000 +0100
+++ linux-2.6.21-git14-ax88796/drivers/net/Makefile	2007-05-11 12:16:24.000000000 +0100
@@ -107,6 +107,7 @@ obj-$(CONFIG_NET_SB1250_MAC) += sb1250-m
 obj-$(CONFIG_B44) += b44.o
 obj-$(CONFIG_FORCEDETH) += forcedeth.o
 obj-$(CONFIG_NE_H8300) += ne-h8300.o
+obj-$(CONFIG_AX88796) += ax88796.o
 
 obj-$(CONFIG_TSI108_ETH) += tsi108_eth.o
 obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
diff -urNp linux-2.6.21-git14/include/net/ax88796.h linux-2.6.21-git14-ax88796/include/net/ax88796.h
--- linux-2.6.21-git14/include/net/ax88796.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21-git14-ax88796/include/net/ax88796.h	2007-05-11 12:16:24.000000000 +0100
@@ -0,0 +1,27 @@
+/* include/net/ax88796.h
+ *
+ * Copyright 2005 Simtec Electronics
+ *	Ben Dooks <[email-masked]>
+ *
+ * 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.
+ *
+*/
+
+#ifndef __NET_AX88796_PLAT_H
+#define __NET_AX88796_PLAT_H
+
+#define AXFLG_HAS_EEPROM		(1<<0)
+#define AXFLG_MAC_FROMDEV		(1<<1)	/* device already has MAC */
+
+struct ax_plat_data {
+	unsigned int	 flags;
+	unsigned char	 wordlength;		/* 1 or 2 */
+	unsigned char	 dcr_val;		/* default value for DCR */
+	unsigned char	 rcr_val;		/* default value for RCR */
+	unsigned char	 gpoc_val;		/* default value for GPOC */
+	u32		*reg_offsets;		/* register offsets */
+};
+
+#endif /* __NET_AX88796_PLAT_H */