// SPDX-License-Identifier: GPL-2.0
/* 3c509.c: A 3c509 EtherLink3 ethernet driver for linux. */
/*
 *      Written 1993-2000 by Donald Becker.
 *
 *      Copyright 1994-2000 by Donald Becker.
 *      Copyright 1993 United States Government as represented by the
 *      Director, National Security Agency.      This software may be used and
 *      distributed according to the terms of the GNU General Public License,
 *      incorporated herein by reference.
 *
 *      This driver is for the 3Com EtherLinkIII series.
 *
 *      The author may be reached as becker@scyld.com, or C/O
 *      Scyld Computing Corporation
 *      410 Severn Ave., Suite 210
 *      Annapolis MD 21403
 *
 *      Known limitations:
 *      Because of the way 3c509 ISA detection works it's difficult to predict
 *      a priori which of several ISA-mode cards will be detected first.
 *
 *      This driver does not use predictive interrupt mode, resulting in higher
 *      packet latency but lower overhead.  If interrupts are disabled for an
 *      unusually long time it could also result in missed packets, but in
 *      practice this rarely happens.
 *
 *
 *      FIXES:
 *              Alan Cox:       Removed the 'Unexpected interrupt' bug.
 *              Michael Meskes: Upgraded to Donald Becker's version 1.07.
 *              Alan Cox:       Increased the eeprom delay. Regardless of
 *                              what the docs say some people definitely
 *                              get problems with lower (but in card spec)
 *                              delays.
 *              v1.10 4/21/97   Fixed module code so that multiple cards may be
 *                              detected, other cleanups.  -djb
 *              Andrea Arcangeli: Upgraded to Donald Becker's version 1.12.
 *              Rick Payne:     Fixed SMP race condition.
 *              v1.13 9/8/97    Made 'max_interrupt_work' an insmod-settable
 *                              variable. -djb
 *              v1.14 10/15/97  Avoided waiting..discard message for fast
 *                              machines. -djb
 *              v1.15 1/31/98   Faster recovery for Tx errors. -djb
 *              v1.16 2/3/98    Different ID port handling to avoid sound
 *                              cards. -djb
 *              v1.18 12Mar2001 Andrew Morton
 *                      - Avoid bogus detect of 3c590's (Andrzej Krzysztofowicz)
 *                      - Reviewed against 1.18 from scyld.com
 *              v1.18a 17Nov2001 Jeff Garzik <jgarzik@pobox.com>
 *                      - ethtool support.
 *              v1.18b 1Mar2002 Zwane Mwaikambo <zwane@commfireservices.com>
 *                      - Power Management support.
 *              v1.18c 1Mar2002 David Ruggiero <jdr@farfalle.com>
 *                      - Full duplex support.
 *              v1.19  16Oct2002 Zwane Mwaikambo <zwane@linuxpower.ca>
 *                      - Additional ethtool features.
 *              v1.19a 28Oct2002 David Ruggiero <jdr@farfalle.com>
 *                      - Increase *read_eeprom udelay to workaround oops with
 *                        2 cards.
 *              v1.19b 08Nov2002 Marc Zyngier <maz@wild-wind.fr.eu.org>
 *                      - Introduce driver model for EISA cards.
 *              v1.20  04Feb2008 Ondrej Zary <linux@rainbow-software.org>
 *                      - convert to isa_driver and pnp_driver and some
 *                        cleanups.
 */

#define DRV_NAME        "3c509"

/* A few values that may be tweaked. */

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT  (400 * HZ / 1000)

#include <linux/bitops.h>
#include <linux/delay.h>        /* for udelay() */
#include <linux/device.h>
#include <linux/eisa.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/in.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/isa.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pm.h>
#include <linux/pnp.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/uaccess.h>

#include <asm/irq.h>

#ifdef EL3_DEBUG
static int el3_debug = EL3_DEBUG;
#else
static int el3_debug = 2;
#endif

/* Used to do a global count of all the cards in the system.  Must be
 * a global variable so that the eisa probe routines can increment it.
 */
static int el3_cards;
#define EL3_MAX_CARDS 8

/* To minimize the size of the driver source I only define operating
 * constants if they are used several times.  You'll need the manual
 * anyway if you want to understand driver details.
 */
/* Offsets from base I/O address. */
#define EL3_DATA 0x00
#define EL3_CMD 0x0e
#define EL3_STATUS 0x0e
#define EEPROM_READ 0x80

#define EL3_IO_EXTENT   16

#define EL3WINDOW(win_num) outw(SELECT_WINDOW + (win_num), ioaddr + EL3_CMD)

/* The top five bits written to EL3_CMD are a command, the lower
 * 11 bits are the parameter, if applicable.
 */
enum c509cmd {
        TOTAL_RESET =            0 << 11,
        SELECT_WINDOW =          1 << 11,
        START_COAX =             2 << 11,
        RX_DISABLE =             3 << 11,
        RX_ENABLE =              4 << 11,
        RX_RESET =               5 << 11,
        RX_DISCARD =             8 << 11,
        TX_ENABLE =              9 << 11,
        TX_DISABLE =            10 << 11,
        TX_RESET =              11 << 11,
        FAKE_INTR =             12 << 11,
        ACK_INTR =              13 << 11,
        SET_INTR_ENB =          14 << 11,
        SET_STATUS_ENB =        15 << 11,
        SET_RX_FILTER =         16 << 11,
        SET_RX_THRESHOLD =      17 << 11,
        SET_TX_THRESHOLD =      18 << 11,
        SET_TX_START =          19 << 11,
        STATS_ENABLE =          21 << 11,
        STATS_DISABLE =         22 << 11,
        STOP_COAX =             23 << 11,
        POWER_UP =              27 << 11,
        POWER_DOWN =            28 << 11,
        POWER_AUTO =            29 << 11,
};

enum c509status {
        INT_LATCH =             0x0001,
        ADAPTER_FAILURE =       0x0002,
        TX_COMPLETE =           0x0004,
        TX_AVAILABLE =          0x0008,
        RX_COMPLETE =           0x0010,
        RX_EARLY =              0x0020,
        INT_REQ =               0x0040,
        STATS_FULL =            0x0080,
        CMD_BUSY =              0x1000,
};

/* The SET_RX_FILTER command accepts the following classes: */
enum rx_filter {
        RX_STATION =    1,
        RX_MULTICAST =  2,
        RX_BROADCAST =  4,
        RX_PROM =       8,
};

/* Register window 1 offsets, the window used in normal operation. */
#define TX_FIFO         0x00
#define RX_FIFO         0x00
#define RX_STATUS       0x08
#define TX_STATUS       0x0B
#define TX_FREE         0x0C    /* Remaining free bytes in Tx buffer. */

#define WN0_CONF_CTRL   0x04    /* Window 0: Configuration control register. */
#define WN0_ADDR_CONF   0x06    /* Window 0: Address configuration register. */
#define WN0_IRQ         0x08    /* Window 0: Set IRQ line in bits 12-15. */
#define WN4_MEDIA       0x0A    /* Window 4: Various transcvr/media bits. */
#define MEDIA_TP        0x00C0  /* Enable link beat and jabber for 10baseT. */
#define WN4_NETDIAG     0x06    /* Window 4: Net diagnostic. */
#define FD_ENABLE       0x8000  /* Enable full-duplex ("external loopback"). */

/*
 * Must be a power of two (we use a binary and in the
 * circular queue).
 */
#define SKB_QUEUE_SIZE  64

enum el3_cardtype { EL3_ISA, EL3_PNP, EL3_EISA };

struct el3_private {
        /* for device access */
        spinlock_t lock;
        /* skb send-queue */
        int head, size;
        struct sk_buff *queue[SKB_QUEUE_SIZE];
        enum el3_cardtype type;
};

static int id_port;
static int current_tag;
static struct net_device *el3_devs[EL3_MAX_CARDS];

/* Parameters that may be passed into the module. */
static int debug = -1;
static int irq[] = {-1, -1, -1, -1, -1, -1, -1, -1};
/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
static int max_interrupt_work = 10;
#ifdef CONFIG_PNP
static int nopnp;
#endif

static int el3_common_init(struct net_device *dev);
static void el3_common_remove(struct net_device *dev);
static ushort id_read_eeprom(int index);
static ushort read_eeprom(int ioaddr, int index);
static int el3_open(struct net_device *dev);
static netdev_tx_t el3_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t el3_interrupt(int irq, void *dev_id);
static void update_stats(struct net_device *dev);
static struct net_device_stats *el3_get_stats(struct net_device *dev);
static int el3_rx(struct net_device *dev);
static int el3_close(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue);
static void el3_down(struct net_device *dev);
static void el3_up(struct net_device *dev);
static const struct ethtool_ops ethtool_ops;
#ifdef CONFIG_PM
static int el3_suspend(struct device *, pm_message_t);
static int el3_resume(struct device *);
#else
#define el3_suspend NULL
#define el3_resume NULL
#endif

/* Generic device remove for all device types. */
static int el3_device_remove(struct device *device);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void el3_poll_controller(struct net_device *dev);
#endif

/* Return 0 on success, 1 on error, 2 when found already detected PnP card. */
static int el3_isa_id_sequence(__be16 *phys_addr)
{
        short lrs_state = 0xff;
        int i;

        /* ISA boards are detected by sending the ID sequence to the
         * ID_PORT.  We find cards past the first by setting the 'current_tag'
         * on cards as they are found.  Cards with their tag set will not
         * respond to subsequent ID sequences.
         */
        outb(0x00, id_port);
        outb(0x00, id_port);
        for (i = 0; i < 255; i++) {
                outb(lrs_state, id_port);
                lrs_state <<= 1;
                lrs_state = lrs_state & 0x100 ? lrs_state ^ 0xcf : lrs_state;
        }
        /* For the first probe, clear all board's tag registers. */
        if (current_tag == 0)
                outb(0xd0, id_port);
        else                    /* Otherwise kill off already-found boards. */
                outb(0xd8, id_port);
        if (id_read_eeprom(7) != 0x6d50)
                return 1;
        /* Read in EEPROM data, which does contention-select.
         * Only the lowest address board will stay "on-line".
         * 3Com got the byte order backwards.
         */
        for (i = 0; i < 3; i++)
                phys_addr[i] = htons(id_read_eeprom(i));
#ifdef CONFIG_PNP
        if (!nopnp) {
                /* The ISA PnP 3c509 cards respond to the ID sequence too.
                 * This check is needed in order not to register them twice.
                 */
                for (i = 0; i < el3_cards; i++) {
                        struct el3_private *lp = netdev_priv(el3_devs[i]);

                        if (lp->type == EL3_PNP &&
                            ether_addr_equal((u8 *)phys_addr,
                                             el3_devs[i]->dev_addr)) {
                                if (el3_debug > 3)
                                        pr_debug("3c509 with address %02x %02x %02x %02x %02x %02x was found by ISAPnP\n",
                                                 phys_addr[0] & 0xff,
                                                 phys_addr[0] >> 8,
                                                 phys_addr[1] & 0xff,
                                                 phys_addr[1] >> 8,
                                                 phys_addr[2] & 0xff,
                                                 phys_addr[2] >> 8);
                                /* Set the adaptor tag so that the next card
                                 * can be found.
                                 */
                                outb(0xd0 + ++current_tag, id_port);
                                return 2;
                        }
                }
        }
#endif /* CONFIG_PNP */
        return 0;
}

static void el3_dev_fill(struct net_device *dev, __be16 *phys_addr, int ioaddr,
                         int irq, int if_port, enum el3_cardtype type)
{
        struct el3_private *lp = netdev_priv(dev);

        eth_hw_addr_set(dev, (u8 *)phys_addr);
        dev->base_addr = ioaddr;
        dev->irq = irq;
        dev->if_port = if_port;
        lp->type = type;
}

static int el3_isa_match(struct device *pdev, unsigned int ndev)
{
        int ioaddr, isa_irq, if_port, err;
        struct net_device *dev;
        unsigned int iobase;
        __be16 phys_addr[3];

        while ((err = el3_isa_id_sequence(phys_addr)) == 2)
                ;       /* Skip to next card when PnP card found */
        if (err == 1)
                return 0;

        iobase = id_read_eeprom(8);
        if_port = iobase >> 14;
        ioaddr = 0x200 + ((iobase & 0x1f) << 4);
        if (irq[el3_cards] > 1 && irq[el3_cards] < 16)
                isa_irq = irq[el3_cards];
        else
                isa_irq = id_read_eeprom(9) >> 12;

        dev = alloc_etherdev(sizeof(struct el3_private));
        if (!dev)
                return -ENOMEM;

        SET_NETDEV_DEV(dev, pdev);

        if (!request_region(ioaddr, EL3_IO_EXTENT, "3c509-isa")) {
                free_netdev(dev);
                return 0;
        }

        /* Set the adaptor tag so that the next card can be found. */
        outb(0xd0 + ++current_tag, id_port);

        /* Activate the adaptor at the EEPROM location. */
        outb((ioaddr >> 4) | 0xe0, id_port);

        EL3WINDOW(0);
        if (inw(ioaddr) != 0x6d50) {
                free_netdev(dev);
                return 0;
        }

        /* Free the interrupt so that some other card can use it. */
        outw(0x0f00, ioaddr + WN0_IRQ);

        el3_dev_fill(dev, phys_addr, ioaddr, isa_irq, if_port, EL3_ISA);
        dev_set_drvdata(pdev, dev);
        if (el3_common_init(dev)) {
                free_netdev(dev);
                return 0;
        }

        el3_devs[el3_cards++] = dev;
        return 1;
}

static void el3_isa_remove(struct device *pdev, unsigned int ndev)
{
        el3_device_remove(pdev);
        dev_set_drvdata(pdev, NULL);
}

#ifdef CONFIG_PM
static int el3_isa_suspend(struct device *dev, unsigned int n,
                           pm_message_t state)
{
        current_tag = 0;
        return el3_suspend(dev, state);
}

static int el3_isa_resume(struct device *dev, unsigned int n)
{
        struct net_device *ndev = dev_get_drvdata(dev);
        int ioaddr = ndev->base_addr, err;
        __be16 phys_addr[3];

        while ((err = el3_isa_id_sequence(phys_addr)) == 2)
                ;       /* Skip to next card when PnP card found */
        if (err == 1)
                return 0;
        /* Set the adaptor tag so that the next card can be found. */
        outb(0xd0 + ++current_tag, id_port);
        /* Enable the card */
        outb((ioaddr >> 4) | 0xe0, id_port);
        EL3WINDOW(0);
        if (inw(ioaddr) != 0x6d50)
                return 1;
        /* Free the interrupt so that some other card can use it. */
        outw(0x0f00, ioaddr + WN0_IRQ);
        return el3_resume(dev);
}
#endif

static struct isa_driver el3_isa_driver = {
        .match          = el3_isa_match,
        .remove         = el3_isa_remove,
#ifdef CONFIG_PM
        .suspend        = el3_isa_suspend,
        .resume         = el3_isa_resume,
#endif
        .driver         = {
                .name   = "3c509"
        },
};

static int isa_registered;

#ifdef CONFIG_PNP
static const struct pnp_device_id el3_pnp_ids[] = {
        { .id = "TCM5090" }, /* 3Com Etherlink III (TP) */
        { .id = "TCM5091" }, /* 3Com Etherlink III */
        { .id = "TCM5094" }, /* 3Com Etherlink III (combo) */
        { .id = "TCM5095" }, /* 3Com Etherlink III (TPO) */
        { .id = "TCM5098" }, /* 3Com Etherlink III (TPC) */
        { .id = "PNP80f7" }, /* 3Com Etherlink III compatible */
        { .id = "PNP80f8" }, /* 3Com Etherlink III compatible */
        { }
};
MODULE_DEVICE_TABLE(pnp, el3_pnp_ids);

static int el3_pnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *id)
{
        struct net_device *dev = NULL;
        int ioaddr, irq, if_port;
        __be16 phys_addr[3];
        short i;
        int err;

        ioaddr = pnp_port_start(pdev, 0);
        if (!request_region(ioaddr, EL3_IO_EXTENT, "3c509-pnp"))
                return -EBUSY;
        irq = pnp_irq(pdev, 0);
        EL3WINDOW(0);
        for (i = 0; i < 3; i++)
                phys_addr[i] = htons(read_eeprom(ioaddr, i));
        if_port = read_eeprom(ioaddr, 8) >> 14;
        dev = alloc_etherdev(sizeof(struct el3_private));
        if (!dev) {
                release_region(ioaddr, EL3_IO_EXTENT);
                return -ENOMEM;
        }
        SET_NETDEV_DEV(dev, &pdev->dev);

        el3_dev_fill(dev, phys_addr, ioaddr, irq, if_port, EL3_PNP);
        pnp_set_drvdata(pdev, dev);
        err = el3_common_init(dev);

        if (err) {
                pnp_set_drvdata(pdev, NULL);
                free_netdev(dev);
                return err;
        }

        el3_devs[el3_cards++] = dev;
        return 0;
}

static void el3_pnp_remove(struct pnp_dev *pdev)
{
        el3_common_remove(pnp_get_drvdata(pdev));
        pnp_set_drvdata(pdev, NULL);
}

#ifdef CONFIG_PM
static int el3_pnp_suspend(struct pnp_dev *pdev, pm_message_t state)
{
        return el3_suspend(&pdev->dev, state);
}

static int el3_pnp_resume(struct pnp_dev *pdev)
{
        return el3_resume(&pdev->dev);
}
#endif

static struct pnp_driver el3_pnp_driver = {
        .name           = "3c509",
        .id_table       = el3_pnp_ids,
        .probe          = el3_pnp_probe,
        .remove         = el3_pnp_remove,
#ifdef CONFIG_PM
        .suspend        = el3_pnp_suspend,
        .resume         = el3_pnp_resume,
#endif
};

static int pnp_registered;
#endif /* CONFIG_PNP */

#ifdef CONFIG_EISA
static const struct eisa_device_id el3_eisa_ids[] = {
                { "TCM5090" },
                { "TCM5091" },
                { "TCM5092" },
                { "TCM5093" },
                { "TCM5094" },
                { "TCM5095" },
                { "TCM5098" },
                { "" }
};
MODULE_DEVICE_TABLE(eisa, el3_eisa_ids);

static int el3_eisa_probe(struct device *device);

static struct eisa_driver el3_eisa_driver = {
                .id_table = el3_eisa_ids,
                .driver   = {
                                .name    = "3c579",
                                .probe   = el3_eisa_probe,
                                .remove  = el3_device_remove,
                                .suspend = el3_suspend,
                                .resume  = el3_resume,
                }
};

static int eisa_registered;
#endif

static const struct net_device_ops netdev_ops = {
        .ndo_open               = el3_open,
        .ndo_stop               = el3_close,
        .ndo_start_xmit         = el3_start_xmit,
        .ndo_get_stats          = el3_get_stats,
        .ndo_set_rx_mode        = set_multicast_list,
        .ndo_tx_timeout         = el3_tx_timeout,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = el3_poll_controller,
#endif
};

static int el3_common_init(struct net_device *dev)
{
        static const char *const if_names[] = {
                "10baseT", "AUI", "undefined", "BNC"
        };
        struct el3_private *lp = netdev_priv(dev);
        int err;

        spin_lock_init(&lp->lock);

        if (dev->mem_start & 0x05) { /* xcvr codes 1/3/4/12 */
                dev->if_port = (dev->mem_start & 0x0f);
        } else { /* xcvr codes 0/8 */
                /* use eeprom value, but save user's full-duplex selection */
                dev->if_port |= (dev->mem_start & 0x08);
        }

        /* The EL3-specific entries in the device structure. */
        dev->netdev_ops = &netdev_ops;
        dev->watchdog_timeo = TX_TIMEOUT;
        dev->ethtool_ops = &ethtool_ops;

        err = register_netdev(dev);
        if (err) {
                pr_err("Failed to register 3c5x9 at %#3.3lx, IRQ %d.\n",
                       dev->base_addr, dev->irq);
                release_region(dev->base_addr, EL3_IO_EXTENT);
                return err;
        }

        pr_info("%s: 3c5x9 found at %#3.3lx, %s port, address %pM, IRQ %d.\n",
                dev->name, dev->base_addr, if_names[(dev->if_port & 0x03)],
                dev->dev_addr, dev->irq);

        return 0;
}

static void el3_common_remove(struct net_device *dev)
{
        unregister_netdev(dev);
        release_region(dev->base_addr, EL3_IO_EXTENT);
        free_netdev(dev);
}

#ifdef CONFIG_EISA
static int el3_eisa_probe(struct device *device)
{
        struct net_device *dev = NULL;
        struct eisa_device *edev;
        int ioaddr, irq, if_port;
        __be16 phys_addr[3];
        short i;
        int err;

        /* Yeepee, The driver framework is calling us ! */
        edev = to_eisa_device(device);
        ioaddr = edev->base_addr;

        if (!request_region(ioaddr, EL3_IO_EXTENT, "3c579-eisa"))
                return -EBUSY;

        /* Change the register set to the configuration window 0. */
        outw(SELECT_WINDOW | 0, ioaddr + 0xC80 + EL3_CMD);

        irq = inw(ioaddr + WN0_IRQ) >> 12;
        if_port = inw(ioaddr + 6) >> 14;
        for (i = 0; i < 3; i++)
                phys_addr[i] = htons(read_eeprom(ioaddr, i));

        /* Restore the "Product ID" to the EEPROM read register. */
        read_eeprom(ioaddr, 3);

        dev = alloc_etherdev(sizeof(struct el3_private));
        if (!dev) {
                release_region(ioaddr, EL3_IO_EXTENT);
                return -ENOMEM;
        }

        SET_NETDEV_DEV(dev, device);

        el3_dev_fill(dev, phys_addr, ioaddr, irq, if_port, EL3_EISA);
        eisa_set_drvdata(edev, dev);
        err = el3_common_init(dev);

        if (err) {
                eisa_set_drvdata(edev, NULL);
                free_netdev(dev);
                return err;
        }

        el3_devs[el3_cards++] = dev;
        return 0;
}
#endif

/* This remove works for all device types.
 *
 * The net dev must be stored in the driver data field.
 */
static int el3_device_remove(struct device *device)
{
        struct net_device *dev;

        dev = dev_get_drvdata(device);

        el3_common_remove(dev);
        return 0;
}

/* Read a word from the EEPROM using the regular EEPROM access register.
 * Assume that we are in register window zero.
 */
static ushort read_eeprom(int ioaddr, int index)
{
        outw(EEPROM_READ + index, ioaddr + 10);
        /* Pause for at least 162 us for the read to take place.
         * Some chips seem to require much longer.
         */
        mdelay(2);
        return inw(ioaddr + 12);
}

/* Read a word from the EEPROM when in the ISA ID probe state. */
static ushort id_read_eeprom(int index)
{
        int bit, word = 0;

        /* Issue read command, and pause for at least 162 us for it to
         * complete. Assume extra-fast 16MHz bus.
         */
        outb(EEPROM_READ + index, id_port);

        /* Pause for at least 162 us for the read to take place.
         * Some chips seem to require much longer.
         */
        mdelay(4);

        for (bit = 15; bit >= 0; bit--)
                word = (word << 1) + (inb(id_port) & 0x01);

        if (el3_debug > 3)
                pr_debug("  3c509 EEPROM word %d %#4.4x.\n", index, word);

        return word;
}

static int el3_open(struct net_device *dev)
{
        int ioaddr = dev->base_addr;
        int i;

        outw(TX_RESET, ioaddr + EL3_CMD);
        outw(RX_RESET, ioaddr + EL3_CMD);
        outw(SET_STATUS_ENB | 0x00, ioaddr + EL3_CMD);

        i = request_irq(dev->irq, el3_interrupt, 0, dev->name, dev);
        if (i)
                return i;

        EL3WINDOW(0);
        if (el3_debug > 3)
                pr_debug("%s: Opening, IRQ %d    status@%x %4.4x.\n",
                         dev->name, dev->irq,
                         ioaddr + EL3_STATUS, inw(ioaddr + EL3_STATUS));

        el3_up(dev);

        if (el3_debug > 3)
                pr_debug("%s: Opened 3c509  IRQ %d  status %4.4x.\n",
                         dev->name, dev->irq, inw(ioaddr + EL3_STATUS));

        return 0;
}

static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
        int ioaddr = dev->base_addr;

        /* Transmitter timeout, serious problems. */
        pr_warn("%s: transmit timed out, Tx_status %2.2x status %4.4x Tx FIFO room %d\n",
                dev->name, inb(ioaddr + TX_STATUS), inw(ioaddr + EL3_STATUS),
                inw(ioaddr + TX_FREE));
        dev->stats.tx_errors++;
        netif_trans_update(dev); /* prevent tx timeout */
        /* Issue TX_RESET and TX_START commands. */
        outw(TX_RESET, ioaddr + EL3_CMD);
        outw(TX_ENABLE, ioaddr + EL3_CMD);
        netif_wake_queue(dev);
}

static netdev_tx_t el3_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct el3_private *lp = netdev_priv(dev);
        int ioaddr = dev->base_addr;
        unsigned long flags;

        netif_stop_queue(dev);

        dev->stats.tx_bytes += skb->len;

        if (el3_debug > 4) {
                pr_debug("%s: el3_start_xmit(length = %u) called, status %4.4x.\n",
                         dev->name, skb->len, inw(ioaddr + EL3_STATUS));
        }
        /*
         *      We lock the driver against other processors. Note
         *      we don't need to lock versus the IRQ as we suspended
         *      that. This means that we lose the ability to take
         *      an RX during a TX upload. That sucks a bit with SMP
         *      on an original 3c509 (2K buffer).
         *
         *      Using disable_irq stops us crapping on other
         *      time sensitive devices.
         */

        spin_lock_irqsave(&lp->lock, flags);

        /* Put out the doubleword header... */
        outw(skb->len, ioaddr + TX_FIFO);
        outw(0x00, ioaddr + TX_FIFO);
        /* ... and the packet rounded to a doubleword. */
        outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);

        if (inw(ioaddr + TX_FREE) > 1536) {
                netif_start_queue(dev);
        } else {
                /* Interrupt us when the FIFO has room for max-sized packet. */
                outw(SET_TX_THRESHOLD + 1536, ioaddr + EL3_CMD);
        }

        spin_unlock_irqrestore(&lp->lock, flags);

        dev_consume_skb_any(skb);

        /* Clear the Tx status stack. */
        {
                short tx_status;
                int i = 4;

                while (--i > 0 && (tx_status = inb(ioaddr + TX_STATUS)) > 0) {
                        if (tx_status & 0x38)
                                dev->stats.tx_aborted_errors++;
                        if (tx_status & 0x30)
                                outw(TX_RESET, ioaddr + EL3_CMD);
                        if (tx_status & 0x3C)
                                outw(TX_ENABLE, ioaddr + EL3_CMD);
                        /* Pop the status stack. */
                        outb(0x00, ioaddr + TX_STATUS);
                }
        }
        return NETDEV_TX_OK;
}

/* The EL3 interrupt handler. */
static irqreturn_t el3_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        int i = max_interrupt_work;
        struct el3_private *lp;
        int ioaddr, status;

        lp = netdev_priv(dev);
        spin_lock(&lp->lock);

        ioaddr = dev->base_addr;

        if (el3_debug > 4) {
                status = inw(ioaddr + EL3_STATUS);
                pr_debug("%s: interrupt, status %4.4x.\n", dev->name, status);
        }

        while ((status = inw(ioaddr + EL3_STATUS)) &
               (INT_LATCH | RX_COMPLETE | STATS_FULL)) {

                if (status & RX_COMPLETE)
                        el3_rx(dev);

                if (status & TX_AVAILABLE) {
                        if (el3_debug > 5)
                                pr_debug("      TX room bit was handled.\n");
                        /* There's room in the FIFO for a full-sized packet. */
                        outw(ACK_INTR | TX_AVAILABLE, ioaddr + EL3_CMD);
                        netif_wake_queue(dev);
                }
                if (status &
                    (ADAPTER_FAILURE | RX_EARLY | STATS_FULL | TX_COMPLETE)) {
                        /* Handle all uncommon interrupts. */
                        if (status & STATS_FULL) {
                                /* Empty statistics. */
                                update_stats(dev);
                        }
                        if (status & RX_EARLY) {
                                /* Rx early is unused. */
                                el3_rx(dev);
                                outw(ACK_INTR | RX_EARLY, ioaddr + EL3_CMD);
                        }
                        if (status & TX_COMPLETE) {
                                /* Really Tx error. */
                                short tx_status;
                                int i = 4;

                                while (--i > 0 &&
                                       ((tx_status = inb(ioaddr + TX_STATUS))
                                        > 0)) {
                                        if (tx_status & 0x38)
                                                dev->stats.tx_aborted_errors++;
                                        if (tx_status & 0x30)
                                                outw(TX_RESET,
                                                     ioaddr + EL3_CMD);
                                        if (tx_status & 0x3C)
                                                outw(TX_ENABLE,
                                                     ioaddr + EL3_CMD);
                                        /* Pop the status stack. */
                                        outb(0x00, ioaddr + TX_STATUS);
                                }
                        }
                        if (status & ADAPTER_FAILURE) {
                                /* Adapter failure requires Rx reset
                                 * and reinit.
                                 */
                                outw(RX_RESET, ioaddr + EL3_CMD);
                                /* Set the Rx filter to the current state. */
                                outw((SET_RX_FILTER | RX_STATION |
                                      RX_BROADCAST |
                                      (dev->flags & IFF_ALLMULTI ?
                                       RX_MULTICAST : 0) |
                                      (dev->flags & IFF_PROMISC ?
                                       RX_PROM : 0)),
                                     ioaddr + EL3_CMD);
                                /* Re-enable the receiver. */
                                outw(RX_ENABLE, ioaddr + EL3_CMD);
                                outw(ACK_INTR | ADAPTER_FAILURE,
                                     ioaddr + EL3_CMD);
                        }
                }

                if (--i < 0) {
                        pr_err("%s: Infinite loop in interrupt, status %4.4x.\n",
                               dev->name, status);
                        /* Clear all interrupts. */
                        outw(ACK_INTR | 0xFF, ioaddr + EL3_CMD);
                        break;
                }
                /* Acknowledge the IRQ. */
                outw(ACK_INTR | INT_REQ | INT_LATCH, ioaddr + EL3_CMD);
        }

        if (el3_debug > 4) {
                pr_debug("%s: exiting interrupt, status %4.4x.\n", dev->name,
                         inw(ioaddr + EL3_STATUS));
        }
        spin_unlock(&lp->lock);
        return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void el3_poll_controller(struct net_device *dev)
{
        disable_irq(dev->irq);
        el3_interrupt(dev->irq, dev);
        enable_irq(dev->irq);
}
#endif

static struct net_device_stats *el3_get_stats(struct net_device *dev)
{
        struct el3_private *lp = netdev_priv(dev);
        unsigned long flags;

        /* This is fast enough not to bother with disable IRQ stuff. */
        spin_lock_irqsave(&lp->lock, flags);
        update_stats(dev);
        spin_unlock_irqrestore(&lp->lock, flags);
        return &dev->stats;
}

/* Update statistics.  We change to register window 6, so this should be run
 * single-threaded if the device is active. This is expected to be a rare
 * operation, and it's simpler for the rest of the driver to assume that
 * window 1 is always valid rather than use a special window-state variable.
 */
static void update_stats(struct net_device *dev)
{
        int ioaddr = dev->base_addr;

        if (el3_debug > 5)
                pr_debug("   Updating the statistics.\n");
        /* Turn off statistics updates while reading. */
        outw(STATS_DISABLE, ioaddr + EL3_CMD);
        /* Switch to the stats window, and read everything. */
        EL3WINDOW(6);
        dev->stats.tx_carrier_errors    += inb(ioaddr + 0);
        dev->stats.tx_heartbeat_errors  += inb(ioaddr + 1);
        /* Multiple collisions. */         inb(ioaddr + 2);
        dev->stats.collisions           += inb(ioaddr + 3);
        dev->stats.tx_window_errors     += inb(ioaddr + 4);
        dev->stats.rx_fifo_errors       += inb(ioaddr + 5);
        dev->stats.tx_packets           += inb(ioaddr + 6);
        /* Rx packets   */                 inb(ioaddr + 7);
        /* Tx deferrals */                 inb(ioaddr + 8);
        inw(ioaddr + 10);       /* Total Rx and Tx octets. */
        inw(ioaddr + 12);

        /* Back to window 1, and turn statistics back on. */
        EL3WINDOW(1);
        outw(STATS_ENABLE, ioaddr + EL3_CMD);
}

static int el3_rx(struct net_device *dev)
{
        int ioaddr = dev->base_addr;
        short rx_status;

        if (el3_debug > 5)
                pr_debug("   In rx_packet(), status %4.4x, rx_status %4.4x.\n",
                         inw(ioaddr + EL3_STATUS), inw(ioaddr + RX_STATUS));
        while ((rx_status = inw(ioaddr + RX_STATUS)) > 0) {
                if (rx_status & 0x4000) {
                        /* Error, update stats. */
                        short error = rx_status & 0x3800;

                        outw(RX_DISCARD, ioaddr + EL3_CMD);
                        dev->stats.rx_errors++;
                        switch (error) {
                        case 0x0000:
                                dev->stats.rx_over_errors++;
                                break;
                        case 0x0800:
                                dev->stats.rx_length_errors++;
                                break;
                        case 0x1000:
                                dev->stats.rx_frame_errors++;
                                break;
                        case 0x1800:
                                dev->stats.rx_length_errors++;
                                break;
                        case 0x2000:
                                dev->stats.rx_frame_errors++;
                                break;
                        case 0x2800:
                                dev->stats.rx_crc_errors++; break;
                        }
                } else {
                        short pkt_len = rx_status & 0x7ff;
                        struct sk_buff *skb;

                        skb = netdev_alloc_skb(dev, pkt_len + 5);
                        if (el3_debug > 4)
                                pr_debug("Receiving packet size %d status %4.4x.\n",
                                         pkt_len, rx_status);
                        if (skb) {
                                /* Align IP on 16 byte. */
                                skb_reserve(skb, 2);

                                /* 'skb->data' points to the start of sk_buff
                                 * data area.
                                 */
                                insl(ioaddr + RX_FIFO, skb_put(skb, pkt_len),
                                     (pkt_len + 3) >> 2);

                                /* Pop top Rx packet. */
                                outw(RX_DISCARD, ioaddr + EL3_CMD);
                                skb->protocol = eth_type_trans(skb, dev);
                                netif_rx(skb);
                                dev->stats.rx_bytes += pkt_len;
                                dev->stats.rx_packets++;
                                continue;
                        }
                        outw(RX_DISCARD, ioaddr + EL3_CMD);
                        dev->stats.rx_dropped++;
                        if (el3_debug)
                                pr_debug("%s: Couldn't allocate a sk_buff of size %d.\n",
                                         dev->name, pkt_len);
                }
                inw(ioaddr + EL3_STATUS);                       /* Delay. */
                while (inw(ioaddr + EL3_STATUS) & 0x1000)
                        pr_debug("      Waiting for 3c509 to discard packet, status %x.\n",
                                 inw(ioaddr + EL3_STATUS));
        }

        return 0;
}

/* Set or clear the multicast filter for this adaptor. */
static void set_multicast_list(struct net_device *dev)
{
        struct el3_private *lp = netdev_priv(dev);
        int ioaddr = dev->base_addr;
        int mc_count = netdev_mc_count(dev);
        unsigned long flags;

        if (el3_debug > 1) {
                static int old;

                if (old != mc_count) {
                        old = mc_count;
                        pr_debug("%s: Setting Rx mode to %d addresses.\n",
                                 dev->name, mc_count);
                }
        }
        spin_lock_irqsave(&lp->lock, flags);
        if (dev->flags & IFF_PROMISC) {
                outw((SET_RX_FILTER | RX_STATION | RX_MULTICAST |
                      RX_BROADCAST | RX_PROM),
                     ioaddr + EL3_CMD);
        } else if (mc_count || (dev->flags & IFF_ALLMULTI)) {
                outw(SET_RX_FILTER | RX_STATION | RX_MULTICAST | RX_BROADCAST,
                     ioaddr + EL3_CMD);
        } else {
                outw(SET_RX_FILTER | RX_STATION | RX_BROADCAST,
                     ioaddr + EL3_CMD);
        }
        spin_unlock_irqrestore(&lp->lock, flags);
}

static int el3_close(struct net_device *dev)
{
        struct el3_private *lp = netdev_priv(dev);
        int ioaddr = dev->base_addr;

        if (el3_debug > 2)
                pr_debug("%s: Shutting down ethercard.\n", dev->name);

        el3_down(dev);

        free_irq(dev->irq, dev);
        /* Switching back to window 0 disables the IRQ. */
        EL3WINDOW(0);
        if (lp->type != EL3_EISA) {
                /* But we explicitly zero the IRQ line select anyway. Don't do
                 * it on EISA cards, it prevents the module from getting an
                 * IRQ after unload+reload...
                 */
                outw(0x0f00, ioaddr + WN0_IRQ);
        }

        return 0;
}

static int el3_link_ok(struct net_device *dev)
{
        int ioaddr = dev->base_addr;
        u16 tmp;

        EL3WINDOW(4);
        tmp = inw(ioaddr + WN4_MEDIA);
        EL3WINDOW(1);
        return tmp & (1 << 11);
}

static void el3_netdev_get_ecmd(struct net_device *dev,
                                struct ethtool_link_ksettings *cmd)
{
        int ioaddr = dev->base_addr;
        u32 supported;
        u16 tmp;

        EL3WINDOW(0);
        /* Obtain current transceiver via WN4_MEDIA? */
        tmp = inw(ioaddr + WN0_ADDR_CONF);
        switch (tmp >> 14) {
        case 0:
                cmd->base.port = PORT_TP;
                break;
        case 1:
                cmd->base.port = PORT_AUI;
                break;
        case 3:
                cmd->base.port = PORT_BNC;
                break;
        default:
                break;
        }

        cmd->base.duplex = DUPLEX_HALF;
        supported = 0;
        tmp = inw(ioaddr + WN0_CONF_CTRL);
        if (tmp & (1 << 13))
                supported |= SUPPORTED_AUI;
        if (tmp & (1 << 12))
                supported |= SUPPORTED_BNC;
        if (tmp & (1 << 9)) {
                supported |= SUPPORTED_TP | SUPPORTED_10baseT_Half |
                             SUPPORTED_10baseT_Full;    /* hmm... */
                EL3WINDOW(4);
                tmp = inw(ioaddr + WN4_NETDIAG);
                if (tmp & FD_ENABLE)
                        cmd->base.duplex = DUPLEX_FULL;
        }

        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
                                                supported);
        cmd->base.speed = SPEED_10;
        EL3WINDOW(1);
}

static int el3_netdev_set_ecmd(struct net_device *dev,
                               const struct ethtool_link_ksettings *cmd)
{
        int ioaddr = dev->base_addr;
        u16 tmp;

        if (cmd->base.speed != SPEED_10)
                return -EINVAL;
        if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL)
                return -EINVAL;

        /* change XCVR type */
        EL3WINDOW(0);
        tmp = inw(ioaddr + WN0_ADDR_CONF);
        switch (cmd->base.port) {
        case PORT_TP:
                tmp &= ~(3 << 14);
                dev->if_port = 0;
                break;
        case PORT_AUI:
                tmp &= ~(3 << 14);
                tmp |= 1 << 14;
                dev->if_port = 1;
                break;
        case PORT_BNC:
                tmp |= 3 << 14;
                dev->if_port = 3;
                break;
        default:
                return -EINVAL;
        }

        outw(tmp, ioaddr + WN0_ADDR_CONF);
        if (dev->if_port == 3) {
                /* Fire up the DC-DC converter if BNC gets enabled. */
                tmp = inw(ioaddr + WN0_ADDR_CONF);
                if (tmp & (3 << 14)) {
                        outw(START_COAX, ioaddr + EL3_CMD);
                        udelay(800);
                } else {
                        return -EIO;
                }
        }

        EL3WINDOW(4);
        tmp = inw(ioaddr + WN4_NETDIAG);
        if (cmd->base.duplex == DUPLEX_FULL)
                tmp |= FD_ENABLE;
        else
                tmp &= ~FD_ENABLE;
        outw(tmp, ioaddr + WN4_NETDIAG);
        EL3WINDOW(1);

        return 0;
}

static void el3_get_drvinfo(struct net_device *dev,
                            struct ethtool_drvinfo *info)
{
        strscpy(info->driver, DRV_NAME, sizeof(info->driver));
}

static int el3_get_link_ksettings(struct net_device *dev,
                                  struct ethtool_link_ksettings *cmd)
{
        struct el3_private *lp = netdev_priv(dev);

        spin_lock_irq(&lp->lock);
        el3_netdev_get_ecmd(dev, cmd);
        spin_unlock_irq(&lp->lock);
        return 0;
}

static int el3_set_link_ksettings(struct net_device *dev,
                                  const struct ethtool_link_ksettings *cmd)
{
        struct el3_private *lp = netdev_priv(dev);
        int ret;

        spin_lock_irq(&lp->lock);
        ret = el3_netdev_set_ecmd(dev, cmd);
        spin_unlock_irq(&lp->lock);
        return ret;
}

static u32 el3_get_link(struct net_device *dev)
{
        struct el3_private *lp = netdev_priv(dev);
        u32 ret;

        spin_lock_irq(&lp->lock);
        ret = el3_link_ok(dev);
        spin_unlock_irq(&lp->lock);
        return ret;
}

static u32 el3_get_msglevel(struct net_device *dev)
{
        return el3_debug;
}

static void el3_set_msglevel(struct net_device *dev, u32 v)
{
        el3_debug = v;
}

static const struct ethtool_ops ethtool_ops = {
        .get_drvinfo = el3_get_drvinfo,
        .get_link = el3_get_link,
        .get_msglevel = el3_get_msglevel,
        .set_msglevel = el3_set_msglevel,
        .get_link_ksettings = el3_get_link_ksettings,
        .set_link_ksettings = el3_set_link_ksettings,
};

static void el3_down(struct net_device *dev)
{
        int ioaddr = dev->base_addr;

        netif_stop_queue(dev);

        /* Turn off statistics ASAP.  We update lp->stats below. */
        outw(STATS_DISABLE, ioaddr + EL3_CMD);

        /* Disable the receiver and transmitter. */
        outw(RX_DISABLE, ioaddr + EL3_CMD);
        outw(TX_DISABLE, ioaddr + EL3_CMD);

        if (dev->if_port == 3) {
                /* Turn off thinnet power.  Green! */
                outw(STOP_COAX, ioaddr + EL3_CMD);
        } else if (dev->if_port == 0) {
                /* Disable link beat and jabber, if_port may change here next
                 * open().
                 */
                EL3WINDOW(4);
                outw(inw(ioaddr + WN4_MEDIA) & ~MEDIA_TP, ioaddr + WN4_MEDIA);
        }

        outw(SET_INTR_ENB | 0x0000, ioaddr + EL3_CMD);

        update_stats(dev);
}

static void el3_up(struct net_device *dev)
{
        int ioaddr = dev->base_addr;
        int i, sw_info, net_diag;

        /* Activating the board required and does no harm otherwise. */
        outw(0x0001, ioaddr + 4);

        /* Set the IRQ line. */
        outw((dev->irq << 12) | 0x0f00, ioaddr + WN0_IRQ);

        /* Set the station address in window 2 each time opened. */
        EL3WINDOW(2);

        for (i = 0; i < 6; i++)
                outb(dev->dev_addr[i], ioaddr + i);

        if ((dev->if_port & 0x03) == 3) {
                /* BNC interface */

                /* Start the thinnet transceiver. We should really wait
                 * 50ms...
                 */
                outw(START_COAX, ioaddr + EL3_CMD);
        } else if ((dev->if_port & 0x03) == 0) {
                /* 10baseT interface */

                /* Combine secondary sw_info word (the adapter level) and
                 * primary sw_info word (duplex setting plus other useless
                 * bits).
                 */
                EL3WINDOW(0);
                sw_info = (read_eeprom(ioaddr, 0x14) & 0x400f) |
                          (read_eeprom(ioaddr, 0x0d) & 0xBff0);

                EL3WINDOW(4);
                net_diag = inw(ioaddr + WN4_NETDIAG);
                /* Temporarily assume full-duplex will be set. */
                net_diag = (net_diag | FD_ENABLE);
                pr_info("%s: ", dev->name);
                switch (dev->if_port & 0x0c) {
                case 12:
                        /* Force full-duplex mode if 3c5x9b. */
                        if (sw_info & 0x000f) {
                                pr_cont("Forcing 3c5x9b full-duplex mode");
                                break;
                        }
                        fallthrough;
                case 8:
                        /* Set full-duplex mode based on eeprom config
                         * setting.
                         */
                        if ((sw_info & 0x000f) && (sw_info & 0x8000)) {
                                pr_cont("Setting 3c5x9b full-duplex mode (from EEPROM configuration bit)");
                                break;
                        }
                        fallthrough;
                default:
                        /* xcvr = (0 || 4) OR user has an old 3c5x9 non "B"
                         * model.
                         */
                        pr_cont("Setting 3c5x9/3c5x9B half-duplex mode");
                        /* Disable full duplex. */
                        net_diag = (net_diag & ~FD_ENABLE);
                }

                outw(net_diag, ioaddr + WN4_NETDIAG);
                pr_cont(" if_port: %d, sw_info: %4.4x\n",
                        dev->if_port, sw_info);
                if (el3_debug > 3)
                        pr_debug("%s: 3c5x9 net diag word is now: %4.4x.\n",
                                 dev->name, net_diag);
                /* Enable link beat and jabber check. */
                outw(inw(ioaddr + WN4_MEDIA) | MEDIA_TP, ioaddr + WN4_MEDIA);
        }

        /* Switch to the stats window, and clear all stats by reading. */
        outw(STATS_DISABLE, ioaddr + EL3_CMD);
        EL3WINDOW(6);
        for (i = 0; i < 9; i++)
                inb(ioaddr + i);
        inw(ioaddr + 10);
        inw(ioaddr + 12);

        /* Switch to register set 1 for normal use. */
        EL3WINDOW(1);

        /* Accept b-case and phys addr only. */
        outw(SET_RX_FILTER | RX_STATION | RX_BROADCAST, ioaddr + EL3_CMD);
        /* Turn on statistics. */
        outw(STATS_ENABLE, ioaddr + EL3_CMD);

        /* Enable the receiver. */
        outw(RX_ENABLE, ioaddr + EL3_CMD);
        /* Enable transmitter. */
        outw(TX_ENABLE, ioaddr + EL3_CMD);
        /* Allow status bits to be seen. */
        outw(SET_STATUS_ENB | 0xff, ioaddr + EL3_CMD);
        /* Ack all pending events, and set active indicator mask. */
        outw(ACK_INTR | INT_LATCH | TX_AVAILABLE | RX_EARLY | INT_REQ,
             ioaddr + EL3_CMD);
        outw((SET_INTR_ENB | INT_LATCH | TX_AVAILABLE | TX_COMPLETE |
              RX_COMPLETE | STATS_FULL),
             ioaddr + EL3_CMD);

        netif_start_queue(dev);
}

/* Power Management support functions */
#ifdef CONFIG_PM

static int el3_suspend(struct device *pdev, pm_message_t state)
{
        struct net_device *dev;
        struct el3_private *lp;
        unsigned long flags;
        int ioaddr;

        dev = dev_get_drvdata(pdev);
        lp = netdev_priv(dev);
        ioaddr = dev->base_addr;

        spin_lock_irqsave(&lp->lock, flags);

        if (netif_running(dev))
                netif_device_detach(dev);

        el3_down(dev);
        outw(POWER_DOWN, ioaddr + EL3_CMD);

        spin_unlock_irqrestore(&lp->lock, flags);
        return 0;
}

static int el3_resume(struct device *pdev)
{
        struct net_device *dev;
        struct el3_private *lp;
        unsigned long flags;
        int ioaddr;

        dev = dev_get_drvdata(pdev);
        lp = netdev_priv(dev);
        ioaddr = dev->base_addr;

        spin_lock_irqsave(&lp->lock, flags);

        outw(POWER_UP, ioaddr + EL3_CMD);
        EL3WINDOW(0);
        el3_up(dev);

        if (netif_running(dev))
                netif_device_attach(dev);

        spin_unlock_irqrestore(&lp->lock, flags);
        return 0;
}

#endif /* CONFIG_PM */

module_param(debug, int, 0);
module_param_hw_array(irq, int, irq, NULL, 0);
module_param(max_interrupt_work, int, 0);
MODULE_PARM_DESC(debug, "debug level (0-6)");
MODULE_PARM_DESC(irq, "IRQ number(s) (assigned)");
MODULE_PARM_DESC(max_interrupt_work, "maximum events handled per interrupt");
#ifdef CONFIG_PNP
module_param(nopnp, int, 0);
MODULE_PARM_DESC(nopnp, "disable ISA PnP support (0-1)");
#endif  /* CONFIG_PNP */
MODULE_DESCRIPTION("3Com Etherlink III (3c509, 3c509B, 3c529, 3c579) ethernet driver");
MODULE_LICENSE("GPL");

static int __init el3_init_module(void)
{
        int ret = 0;

        if (debug >= 0)
                el3_debug = debug;

#ifdef CONFIG_PNP
        if (!nopnp) {
                ret = pnp_register_driver(&el3_pnp_driver);
                if (!ret)
                        pnp_registered = 1;
        }
#endif
        /* Select an open I/O location at 0x1*0 to do ISA contention select. */
        /* Start with 0x110 to avoid some sound cards.*/
        for (id_port = 0x110; id_port < 0x200; id_port += 0x10) {
                if (!request_region(id_port, 1, "3c509-control"))
                        continue;
                outb(0x00, id_port);
                outb(0xff, id_port);
                if (inb(id_port) & 0x01)
                        break;
                release_region(id_port, 1);
        }
        if (id_port >= 0x200) {
                id_port = 0;
                pr_err("No I/O port available for 3c509 activation.\n");
        } else {
                ret = isa_register_driver(&el3_isa_driver, EL3_MAX_CARDS);
                if (!ret)
                        isa_registered = 1;
        }
#ifdef CONFIG_EISA
        ret = eisa_driver_register(&el3_eisa_driver);
        if (!ret)
                eisa_registered = 1;
#endif

#ifdef CONFIG_PNP
        if (pnp_registered)
                ret = 0;
#endif
        if (isa_registered)
                ret = 0;
#ifdef CONFIG_EISA
        if (eisa_registered)
                ret = 0;
#endif
        return ret;
}

static void __exit el3_cleanup_module(void)
{
#ifdef CONFIG_PNP
        if (pnp_registered)
                pnp_unregister_driver(&el3_pnp_driver);
#endif
        if (isa_registered)
                isa_unregister_driver(&el3_isa_driver);
        if (id_port)
                release_region(id_port, 1);
#ifdef CONFIG_EISA
        if (eisa_registered)
                eisa_driver_unregister(&el3_eisa_driver);
#endif
}

module_init(el3_init_module);
module_exit(el3_cleanup_module);