xref: /kernel/linux/linux-6.6/drivers/net/ethernet/8390/ax88796.c

// SPDX-License-Identifier: GPL-2.0-only
/* drivers/net/ethernet/8390/ax88796.c
 *
 * Copyright 2005,2007 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * Asix AX88796 10/100 Ethernet controller support
 *	Based on ne.c, by Donald Becker, et-al.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/isapnp.h>
#include <linux/interrupt.h>
#include <linux/io.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/mdio-bitbang.h>
#include <linux/phy.h>
#include <linux/eeprom_93cx6.h>
#include <linux/slab.h>

#include <net/ax88796.h>


/* 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_start_xmit ax_ei_start_xmit
#define __ei_tx_timeout ax_ei_tx_timeout
#define __ei_get_stats ax_ei_get_stats
#define __ei_set_multicast_list ax_ei_set_multicast_list
#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 */

#define AX_GPOC_PPDSET	BIT(6)

/* device private data */

struct ax_device {
	struct mii_bus *mii_bus;
	struct mdiobb_ctrl bb_ctrl;
	void __iomem *addr_memr;
	u8 reg_memr;
	int link;
	int speed;
	int duplex;

	void __iomem *map2;
	const struct ax_plat_data *plat;

	unsigned char running;
	unsigned char resume_open;
	unsigned int irqflags;

	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);
}

void ax_NS8390_reinit(struct net_device *dev)
{
	ax_NS8390_init(dev, 1);
}

EXPORT_SYMBOL_GPL(ax_NS8390_reinit);

/*
 * ax_initial_check
 *
 * do an initial probe for the card to check whether 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;

	netif_dbg(ei_local, hw, dev, "resetting the 8390 t=%ld...\n", jiffies);

	ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET);

	ei_local->txing = 0;
	ei_local->dmaing = 0;

	/* This check _should_not_ be necessary, omit eventually. */
	while ((ei_inb(addr + EN0_ISR) & ENISR_RESET) == 0) {
		if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) {
			netdev_warn(dev, "%s: did not complete.\n", __func__);
			break;
		}
	}

	ei_outb(ENISR_RESET, addr + EN0_ISR);	/* Ack intr. */
}

/* Wrapper for __ei_interrupt for platforms that have a platform-specific
 * way to find out whether the interrupt request might be caused by
 * the ax88796 chip.
 */
static irqreturn_t ax_ei_interrupt_filtered(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct ax_device *ax = to_ax_dev(dev);
	struct platform_device *pdev = to_platform_device(dev->dev.parent);

	if (!ax->plat->check_irq(pdev))
		return IRQ_NONE;

	return ax_ei_interrupt(irq, dev_id);
}

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_local->dmaing) {
		netdev_err(dev, "DMAing conflict in %s "
			"[DMAstat:%d][irqlock:%d].\n",
			__func__,
			ei_local->dmaing, ei_local->irqlock);
		return;
	}

	ei_local->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_local->word16)
		ioread16_rep(nic_base + NE_DATAPORT, hdr,
			     sizeof(struct e8390_pkt_hdr) >> 1);
	else
		ioread8_rep(nic_base + NE_DATAPORT, hdr,
			    sizeof(struct e8390_pkt_hdr));

	ei_outb(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_local->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_local->dmaing) {
		netdev_err(dev,
			"DMAing conflict in %s "
			"[DMAstat:%d][irqlock:%d].\n",
			__func__,
			ei_local->dmaing, ei_local->irqlock);
		return;
	}

	ei_local->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_local->word16) {
		ioread16_rep(nic_base + NE_DATAPORT, buf, count >> 1);
		if (count & 0x01)
			buf[count-1] = ei_inb(nic_base + NE_DATAPORT);

	} else {
		ioread8_rep(nic_base + NE_DATAPORT, buf, count);
	}

	ei_local->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_local->word16 && (count & 0x01))
		count++;

	/* This *shouldn't* happen. If it does, it's the last thing you'll see */
	if (ei_local->dmaing) {
		netdev_err(dev, "DMAing conflict in %s."
			"[DMAstat:%d][irqlock:%d]\n",
			__func__,
		       ei_local->dmaing, ei_local->irqlock);
		return;
	}

	ei_local->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_local->word16)
		iowrite16_rep(nic_base + NE_DATAPORT, buf, count >> 1);
	else
		iowrite8_rep(nic_base + NE_DATAPORT, buf, count);

	dma_start = jiffies;

	while ((ei_inb(nic_base + EN0_ISR) & ENISR_RDC) == 0) {
		if (time_after(jiffies, dma_start + 2 * HZ / 100)) { /* 20ms */
			netdev_warn(dev, "timeout waiting for Tx RDC.\n");
			ax_reset_8390(dev);
			ax_NS8390_init(dev, 1);
			break;
		}
	}

	ei_outb(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_local->dmaing &= ~0x01;
}

/* definitions for accessing MII/EEPROM interface */

#define AX_MEMR			EI_SHIFT(0x14)
#define AX_MEMR_MDC		BIT(0)
#define AX_MEMR_MDIR		BIT(1)
#define AX_MEMR_MDI		BIT(2)
#define AX_MEMR_MDO		BIT(3)
#define AX_MEMR_EECS		BIT(4)
#define AX_MEMR_EEI		BIT(5)
#define AX_MEMR_EEO		BIT(6)
#define AX_MEMR_EECLK		BIT(7)

static void ax_handle_link_change(struct net_device *dev)
{
	struct ax_device  *ax = to_ax_dev(dev);
	struct phy_device *phy_dev = dev->phydev;
	int status_change = 0;

	if (phy_dev->link && ((ax->speed != phy_dev->speed) ||
			     (ax->duplex != phy_dev->duplex))) {

		ax->speed = phy_dev->speed;
		ax->duplex = phy_dev->duplex;
		status_change = 1;
	}

	if (phy_dev->link != ax->link) {
		if (!phy_dev->link) {
			ax->speed = 0;
			ax->duplex = -1;
		}
		ax->link = phy_dev->link;

		status_change = 1;
	}

	if (status_change)
		phy_print_status(phy_dev);
}

static int ax_mii_probe(struct net_device *dev)
{
	struct ax_device  *ax = to_ax_dev(dev);
	struct phy_device *phy_dev = NULL;
	int ret;

	/* find the first phy */
	phy_dev = phy_find_first(ax->mii_bus);
	if (!phy_dev) {
		netdev_err(dev, "no PHY found\n");
		return -ENODEV;
	}

	ret = phy_connect_direct(dev, phy_dev, ax_handle_link_change,
				 PHY_INTERFACE_MODE_MII);
	if (ret) {
		netdev_err(dev, "Could not attach to PHY\n");
		return ret;
	}

	phy_set_max_speed(phy_dev, SPEED_100);

	netdev_info(dev, "PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
		    phy_dev->drv->name, phydev_name(phy_dev), phy_dev->irq);

	return 0;
}

static void ax_phy_switch(struct net_device *dev, int on)
{
	struct ei_device *ei_local = netdev_priv(dev);
	struct ax_device *ax = to_ax_dev(dev);

	u8 reg_gpoc =  ax->plat->gpoc_val;

	if (!!on)
		reg_gpoc &= ~AX_GPOC_PPDSET;
	else
		reg_gpoc |= AX_GPOC_PPDSET;

	ei_outb(reg_gpoc, ei_local->mem + EI_SHIFT(0x17));
}

static void ax_bb_mdc(struct mdiobb_ctrl *ctrl, int level)
{
	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);

	if (level)
		ax->reg_memr |= AX_MEMR_MDC;
	else
		ax->reg_memr &= ~AX_MEMR_MDC;

	ei_outb(ax->reg_memr, ax->addr_memr);
}

static void ax_bb_dir(struct mdiobb_ctrl *ctrl, int output)
{
	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);

	if (output)
		ax->reg_memr &= ~AX_MEMR_MDIR;
	else
		ax->reg_memr |= AX_MEMR_MDIR;

	ei_outb(ax->reg_memr, ax->addr_memr);
}

static void ax_bb_set_data(struct mdiobb_ctrl *ctrl, int value)
{
	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);

	if (value)
		ax->reg_memr |= AX_MEMR_MDO;
	else
		ax->reg_memr &= ~AX_MEMR_MDO;

	ei_outb(ax->reg_memr, ax->addr_memr);
}

static int ax_bb_get_data(struct mdiobb_ctrl *ctrl)
{
	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
	int reg_memr = ei_inb(ax->addr_memr);

	return reg_memr & AX_MEMR_MDI ? 1 : 0;
}

static const struct mdiobb_ops bb_ops = {
	.owner = THIS_MODULE,
	.set_mdc = ax_bb_mdc,
	.set_mdio_dir = ax_bb_dir,
	.set_mdio_data = ax_bb_set_data,
	.get_mdio_data = ax_bb_get_data,
};

static int ax_mii_init(struct net_device *dev)
{
	struct platform_device *pdev = to_platform_device(dev->dev.parent);
	struct ei_device *ei_local = netdev_priv(dev);
	struct ax_device *ax = to_ax_dev(dev);
	int err;

	ax->bb_ctrl.ops = &bb_ops;
	ax->addr_memr = ei_local->mem + AX_MEMR;
	ax->mii_bus = alloc_mdio_bitbang(&ax->bb_ctrl);
	if (!ax->mii_bus) {
		err = -ENOMEM;
		goto out;
	}

	ax->mii_bus->name = "ax88796_mii_bus";
	ax->mii_bus->parent = dev->dev.parent;
	snprintf(ax->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
		 pdev->name, pdev->id);

	err = mdiobus_register(ax->mii_bus);
	if (err)
		goto out_free_mdio_bitbang;

	return 0;

 out_free_mdio_bitbang:
	free_mdio_bitbang(ax->mii_bus);
 out:
	return err;
}

static int ax_open(struct net_device *dev)
{
	struct ax_device *ax = to_ax_dev(dev);
	int ret;

	netdev_dbg(dev, "open\n");

	ret = ax_mii_init(dev);
	if (ret)
		goto failed_mii;

	if (ax->plat->check_irq)
		ret = request_irq(dev->irq, ax_ei_interrupt_filtered,
				  ax->irqflags, dev->name, dev);
	else
		ret = request_irq(dev->irq, ax_ei_interrupt, ax->irqflags,
				  dev->name, dev);
	if (ret)
		goto failed_request_irq;

	/* turn the phy on (if turned off) */
	ax_phy_switch(dev, 1);

	ret = ax_mii_probe(dev);
	if (ret)
		goto failed_mii_probe;
	phy_start(dev->phydev);

	ret = ax_ei_open(dev);
	if (ret)
		goto failed_ax_ei_open;

	ax->running = 1;

	return 0;

 failed_ax_ei_open:
	phy_disconnect(dev->phydev);
 failed_mii_probe:
	ax_phy_switch(dev, 0);
	free_irq(dev->irq, dev);
 failed_request_irq:
	/* unregister mdiobus */
	mdiobus_unregister(ax->mii_bus);
	free_mdio_bitbang(ax->mii_bus);
 failed_mii:
	return ret;
}

static int ax_close(struct net_device *dev)
{
	struct ax_device *ax = to_ax_dev(dev);

	netdev_dbg(dev, "close\n");

	ax->running = 0;
	wmb();

	ax_ei_close(dev);

	/* turn the phy off */
	ax_phy_switch(dev, 0);
	phy_disconnect(dev->phydev);

	free_irq(dev->irq, dev);

	mdiobus_unregister(ax->mii_bus);
	free_mdio_bitbang(ax->mii_bus);
	return 0;
}

static int ax_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
{
	struct phy_device *phy_dev = dev->phydev;

	if (!netif_running(dev))
		return -EINVAL;

	if (!phy_dev)
		return -ENODEV;

	return phy_mii_ioctl(phy_dev, req, cmd);
}

/* ethtool ops */

static void ax_get_drvinfo(struct net_device *dev,
			   struct ethtool_drvinfo *info)
{
	struct platform_device *pdev = to_platform_device(dev->dev.parent);

	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
	strscpy(info->version, DRV_VERSION, sizeof(info->version));
	strscpy(info->bus_info, pdev->name, sizeof(info->bus_info));
}

static u32 ax_get_msglevel(struct net_device *dev)
{
	struct ei_device *ei_local = netdev_priv(dev);

	return ei_local->msg_enable;
}

static void ax_set_msglevel(struct net_device *dev, u32 v)
{
	struct ei_device *ei_local = netdev_priv(dev);

	ei_local->msg_enable = v;
}

static const struct ethtool_ops ax_ethtool_ops = {
	.get_drvinfo		= ax_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_ts_info		= ethtool_op_get_ts_info,
	.get_msglevel		= ax_get_msglevel,
	.set_msglevel		= ax_set_msglevel,
	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
};

#ifdef CONFIG_AX88796_93CX6
static void ax_eeprom_register_read(struct eeprom_93cx6 *eeprom)
{
	struct ei_device *ei_local = eeprom->data;
	u8 reg = ei_inb(ei_local->mem + AX_MEMR);

	eeprom->reg_data_in = reg & AX_MEMR_EEI;
	eeprom->reg_data_out = reg & AX_MEMR_EEO; /* Input pin */
	eeprom->reg_data_clock = reg & AX_MEMR_EECLK;
	eeprom->reg_chip_select = reg & AX_MEMR_EECS;
}

static void ax_eeprom_register_write(struct eeprom_93cx6 *eeprom)
{
	struct ei_device *ei_local = eeprom->data;
	u8 reg = ei_inb(ei_local->mem + AX_MEMR);

	reg &= ~(AX_MEMR_EEI | AX_MEMR_EECLK | AX_MEMR_EECS);

	if (eeprom->reg_data_in)
		reg |= AX_MEMR_EEI;
	if (eeprom->reg_data_clock)
		reg |= AX_MEMR_EECLK;
	if (eeprom->reg_chip_select)
		reg |= AX_MEMR_EECS;

	ei_outb(reg, ei_local->mem + AX_MEMR);
	udelay(10);
}
#endif

static const struct net_device_ops ax_netdev_ops = {
	.ndo_open		= ax_open,
	.ndo_stop		= ax_close,
	.ndo_eth_ioctl		= ax_ioctl,

	.ndo_start_xmit		= ax_ei_start_xmit,
	.ndo_tx_timeout		= ax_ei_tx_timeout,
	.ndo_get_stats		= ax_ei_get_stats,
	.ndo_set_rx_mode	= ax_ei_set_multicast_list,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= ax_ei_poll,
#endif
};

/* 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)
{
	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 (ax->plat->flags & AXFLG_HAS_EEPROM) {
		unsigned char SA_prom[32];

		ei_outb(6, ioaddr + EN0_RCNTLO);
		ei_outb(0, ioaddr + EN0_RCNTHI);
		ei_outb(0, ioaddr + EN0_RSARLO);
		ei_outb(0, ioaddr + EN0_RSARHI);
		ei_outb(E8390_RREAD + E8390_START, ioaddr + NE_CMD);
		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);
		}
		ei_outb(ENISR_RDC, ioaddr + EN0_ISR);	/* Ack intr. */

		if (ax->plat->wordlength == 2)
			for (i = 0; i < 16; i++)
				SA_prom[i] = SA_prom[i+i];

		eth_hw_addr_set(dev, SA_prom);
	}

#ifdef CONFIG_AX88796_93CX6
	if (ax->plat->flags & AXFLG_HAS_93CX6) {
		unsigned char mac_addr[ETH_ALEN];
		struct eeprom_93cx6 eeprom;

		eeprom.data = ei_local;
		eeprom.register_read = ax_eeprom_register_read;
		eeprom.register_write = ax_eeprom_register_write;
		eeprom.width = PCI_EEPROM_WIDTH_93C56;

		eeprom_93cx6_multiread(&eeprom, 0,
				       (__le16 __force *)mac_addr,
				       sizeof(mac_addr) >> 1);

		eth_hw_addr_set(dev, mac_addr);
	}
#endif
	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 (ax->plat->flags & AXFLG_MAC_FROMDEV) {
		u8 addr[ETH_ALEN];

		ei_outb(E8390_NODMA + E8390_PAGE1 + E8390_STOP,
			ei_local->mem + E8390_CMD); /* 0x61 */
		for (i = 0; i < ETH_ALEN; i++)
			addr[i] = ei_inb(ioaddr + EN1_PHYS_SHIFT(i));
		eth_hw_addr_set(dev, addr);
	}

	if ((ax->plat->flags & AXFLG_MAC_FROMPLATFORM) &&
	    ax->plat->mac_addr)
		eth_hw_addr_set(dev, ax->plat->mac_addr);

	if (!is_valid_ether_addr(dev->dev_addr)) {
		eth_hw_addr_random(dev);
		dev_info(&dev->dev, "Using random MAC address: %pM\n",
			 dev->dev_addr);
	}

	ax_reset_8390(dev);

	ei_local->name = "AX88796";
	ei_local->tx_start_page = start_page;
	ei_local->stop_page = stop_page;
	ei_local->word16 = (ax->plat->wordlength == 2);
	ei_local->rx_start_page = start_page + TX_PAGES;

#ifdef PACKETBUF_MEMSIZE
	/* Allow the packet buffer size to be overridden by know-it-alls. */
	ei_local->stop_page = ei_local->tx_start_page + PACKETBUF_MEMSIZE;
#endif

	ei_local->reset_8390 = &ax_reset_8390;
	if (ax->plat->block_input)
		ei_local->block_input = ax->plat->block_input;
	else
		ei_local->block_input = &ax_block_input;
	if (ax->plat->block_output)
		ei_local->block_output = ax->plat->block_output;
	else
		ei_local->block_output = &ax_block_output;
	ei_local->get_8390_hdr = &ax_get_8390_hdr;
	ei_local->priv = 0;

	dev->netdev_ops = &ax_netdev_ops;
	dev->ethtool_ops = &ax_ethtool_ops;

	ax_NS8390_init(dev, 0);

	ret = register_netdev(dev);
	if (ret)
		goto err_out;

	netdev_info(dev, "%dbit, irq %d, %lx, MAC: %pM\n",
		    ei_local->word16 ? 16 : 8, dev->irq, dev->base_addr,
		    dev->dev_addr);

	return 0;

 err_out:
	return ret;
}

static int ax_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct ei_device *ei_local = netdev_priv(dev);
	struct ax_device *ax = to_ax_dev(dev);
	struct resource *mem;

	unregister_netdev(dev);

	iounmap(ei_local->mem);
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(mem->start, resource_size(mem));

	if (ax->map2) {
		iounmap(ax->map2);
		mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		release_mem_region(mem->start, resource_size(mem));
	}

	platform_set_drvdata(pdev, NULL);
	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 ei_device *ei_local;
	struct ax_device *ax;
	struct resource *irq, *mem, *mem2;
	unsigned long mem_size, mem2_size = 0;
	int ret = 0;

	dev = ax__alloc_ei_netdev(sizeof(struct ax_device));
	if (dev == NULL)
		return -ENOMEM;

	/* ok, let's setup our device */
	SET_NETDEV_DEV(dev, &pdev->dev);
	ei_local = netdev_priv(dev);
	ax = to_ax_dev(dev);

	ax->plat = dev_get_platdata(&pdev->dev);
	platform_set_drvdata(pdev, dev);

	ei_local->rxcr_base = ax->plat->rcr_val;

	/* find the platform resources */
	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq) {
		dev_err(&pdev->dev, "no IRQ specified\n");
		ret = -ENXIO;
		goto exit_mem;
	}

	dev->irq = irq->start;
	ax->irqflags = irq->flags & IRQF_TRIGGER_MASK;

	if (irq->flags &  IORESOURCE_IRQ_SHAREABLE)
		ax->irqflags |= IRQF_SHARED;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "no MEM specified\n");
		ret = -ENXIO;
		goto exit_mem;
	}

	mem_size = resource_size(mem);

	/*
	 * setup the register offsets from either the platform data or
	 * by using the size of the resource provided
	 */
	if (ax->plat->reg_offsets)
		ei_local->reg_offset = ax->plat->reg_offsets;
	else {
		ei_local->reg_offset = ax->reg_offsets;
		for (ret = 0; ret < 0x18; ret++)
			ax->reg_offsets[ret] = (mem_size / 0x18) * ret;
	}

	if (!request_mem_region(mem->start, mem_size, pdev->name)) {
		dev_err(&pdev->dev, "cannot reserve registers\n");
		ret = -ENXIO;
		goto exit_mem;
	}

	ei_local->mem = ioremap(mem->start, mem_size);
	dev->base_addr = (unsigned long)ei_local->mem;

	if (ei_local->mem == NULL) {
		dev_err(&pdev->dev, "Cannot ioremap area %pR\n", mem);

		ret = -ENXIO;
		goto exit_req;
	}

	/* look for reset area */
	mem2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!mem2) {
		if (!ax->plat->reg_offsets) {
			for (ret = 0; ret < 0x20; ret++)
				ax->reg_offsets[ret] = (mem_size / 0x20) * ret;
		}
	} else {
		mem2_size = resource_size(mem2);

		if (!request_mem_region(mem2->start, mem2_size, pdev->name)) {
			dev_err(&pdev->dev, "cannot reserve registers\n");
			ret = -ENXIO;
			goto exit_mem1;
		}

		ax->map2 = ioremap(mem2->start, mem2_size);
		if (!ax->map2) {
			dev_err(&pdev->dev, "cannot map reset register\n");
			ret = -ENXIO;
			goto exit_mem2;
		}

		ei_local->reg_offset[0x1f] = ax->map2 - ei_local->mem;
	}

	/* got resources, now initialise and register device */
	ret = ax_init_dev(dev);
	if (!ret)
		return 0;

	if (!ax->map2)
		goto exit_mem1;

	iounmap(ax->map2);

 exit_mem2:
	if (mem2)
		release_mem_region(mem2->start, mem2_size);

 exit_mem1:
	iounmap(ei_local->mem);

 exit_req:
	release_mem_region(mem->start, mem_size);

 exit_mem:
	platform_set_drvdata(pdev, NULL);
	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",
	},
	.probe		= ax_probe,
	.remove		= ax_remove,
	.suspend	= ax_suspend,
	.resume		= ax_resume,
};

module_platform_driver(axdrv);

MODULE_DESCRIPTION("AX88796 10/100 Ethernet platform driver");
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:ax88796");