/* 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.
 *
 * 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/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);
}

/*
 * 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;
        }

        /* mask with MAC supported features */
        phy_dev->supported &= PHY_BASIC_FEATURES;
        phy_dev->advertising = phy_dev->supported;

        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);

        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
        strlcpy(info->version, DRV_VERSION, sizeof(info->version));
        strlcpy(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_do_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];

                memcpy(dev->dev_addr, SA_prom, ETH_ALEN);
        }

#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);

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

        if ((ax->plat->flags & AXFLG_MAC_FROMPLATFORM) &&
            ax->plat->mac_addr)
                memcpy(dev->dev_addr, ax->plat->mac_addr, ETH_ALEN);

        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");