smc911x.c

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/*
 * smc911x.c
 * This is a driver for SMSC's LAN911{5,6,7,8} single-chip Ethernet devices.
 *
 * Copyright (C) 2005 Sensoria Corp
 *     Derived from the unified SMC91x driver by Nicolas Pitre
 *     and the smsc911x.c reference driver by SMSC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Arguments:
 *   watchdog  = TX watchdog timeout
 *   tx_fifo_kb = Size of TX FIFO in KB
 *
 * History:
 *    04/16/05  Dustin McIntire      Initial version
 */
static const char version[] =
     "smc911x.c: v1.0 04-16-2005 by Dustin McIntire <[email protected]>\n";

/* Debugging options */
#define ENABLE_SMC_DEBUG_RX     0
#define ENABLE_SMC_DEBUG_TX     0
#define ENABLE_SMC_DEBUG_DMA        0
#define ENABLE_SMC_DEBUG_PKTS       0
#define ENABLE_SMC_DEBUG_MISC       0
#define ENABLE_SMC_DEBUG_FUNC       0

#define SMC_DEBUG_RX        ((ENABLE_SMC_DEBUG_RX   ? 1 : 0) << 0)
#define SMC_DEBUG_TX        ((ENABLE_SMC_DEBUG_TX   ? 1 : 0) << 1)
#define SMC_DEBUG_DMA       ((ENABLE_SMC_DEBUG_DMA  ? 1 : 0) << 2)
#define SMC_DEBUG_PKTS      ((ENABLE_SMC_DEBUG_PKTS ? 1 : 0) << 3)
#define SMC_DEBUG_MISC      ((ENABLE_SMC_DEBUG_MISC ? 1 : 0) << 4)
#define SMC_DEBUG_FUNC      ((ENABLE_SMC_DEBUG_FUNC ? 1 : 0) << 5)

#ifndef SMC_DEBUG
#define SMC_DEBUG    ( SMC_DEBUG_RX   | \
               SMC_DEBUG_TX   | \
               SMC_DEBUG_DMA  | \
               SMC_DEBUG_PKTS | \
               SMC_DEBUG_MISC | \
               SMC_DEBUG_FUNC   \
             )
#endif

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/workqueue.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <asm/io.h>

#include "smc911x.h"

/*
 * Transmit timeout, default 5 seconds.
 */
static int watchdog = 5000;
module_param(watchdog, int, 0400);
MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");

static int tx_fifo_kb=8;
module_param(tx_fifo_kb, int, 0400);
MODULE_PARM_DESC(tx_fifo_kb,"transmit FIFO size in KB (1<x<15)(default=8)");

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:smc911x");

/*
 * The internal workings of the driver.  If you are changing anything
 * here with the SMC stuff, you should have the datasheet and know
 * what you are doing.
 */
#define CARDNAME "smc911x"

/*
 * Use power-down feature of the chip
 */
#define POWER_DOWN       1

#if SMC_DEBUG > 0
#define DBG(n, args...)              \
    do {                     \
        if (SMC_DEBUG & (n))         \
            printk(args);        \
    } while (0)

#define PRINTK(args...)   printk(args)
#else
#define DBG(n, args...)   do { } while (0)
#define PRINTK(args...)   printk(KERN_DEBUG args)
#endif

#if SMC_DEBUG_PKTS > 0
static void PRINT_PKT(u_char *buf, int length)
{
    int i;
    int remainder;
    int lines;

    lines = length / 16;
    remainder = length % 16;

    for (i = 0; i < lines ; i ++) {
        int cur;
        for (cur = 0; cur < 8; cur++) {
            u_char a, b;
            a = *buf++;
            b = *buf++;
            printk("%02x%02x ", a, b);
        }
        printk("\n");
    }
    for (i = 0; i < remainder/2 ; i++) {
        u_char a, b;
        a = *buf++;
        b = *buf++;
        printk("%02x%02x ", a, b);
    }
    printk("\n");
}
#else
#define PRINT_PKT(x...)  do { } while (0)
#endif


/* this enables an interrupt in the interrupt mask register */
#define SMC_ENABLE_INT(lp, x) do {          \
    unsigned int  __mask;               \
    __mask = SMC_GET_INT_EN((lp));          \
    __mask |= (x);                  \
    SMC_SET_INT_EN((lp), __mask);           \
} while (0)

/* this disables an interrupt from the interrupt mask register */
#define SMC_DISABLE_INT(lp, x) do {         \
    unsigned int  __mask;               \
    __mask = SMC_GET_INT_EN((lp));          \
    __mask &= ~(x);                 \
    SMC_SET_INT_EN((lp), __mask);           \
} while (0)

/*
 * this does a soft reset on the device
 */
static void smc911x_reset(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int reg, timeout=0, resets=1, irq_cfg;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    /*   Take out of PM setting first */
    if ((SMC_GET_PMT_CTRL(lp) & PMT_CTRL_READY_) == 0) {
        /* Write to the bytetest will take out of powerdown */
        SMC_SET_BYTE_TEST(lp, 0);
        timeout=10;
        do {
            udelay(10);
            reg = SMC_GET_PMT_CTRL(lp) & PMT_CTRL_READY_;
        } while (--timeout && !reg);
        if (timeout == 0) {
            PRINTK("%s: smc911x_reset timeout waiting for PM restore\n", dev->name);
            return;
        }
    }

    /* Disable all interrupts */
    spin_lock_irqsave(&lp->lock, flags);
    SMC_SET_INT_EN(lp, 0);
    spin_unlock_irqrestore(&lp->lock, flags);

    while (resets--) {
        SMC_SET_HW_CFG(lp, HW_CFG_SRST_);
        timeout=10;
        do {
            udelay(10);
            reg = SMC_GET_HW_CFG(lp);
            /* If chip indicates reset timeout then try again */
            if (reg & HW_CFG_SRST_TO_) {
                PRINTK("%s: chip reset timeout, retrying...\n", dev->name);
                resets++;
                break;
            }
        } while (--timeout && (reg & HW_CFG_SRST_));
    }
    if (timeout == 0) {
        PRINTK("%s: smc911x_reset timeout waiting for reset\n", dev->name);
        return;
    }

    /* make sure EEPROM has finished loading before setting GPIO_CFG */
    timeout=1000;
    while (--timeout && (SMC_GET_E2P_CMD(lp) & E2P_CMD_EPC_BUSY_))
        udelay(10);

    if (timeout == 0){
        PRINTK("%s: smc911x_reset timeout waiting for EEPROM busy\n", dev->name);
        return;
    }

    /* Initialize interrupts */
    SMC_SET_INT_EN(lp, 0);
    SMC_ACK_INT(lp, -1);

    /* Reset the FIFO level and flow control settings */
    SMC_SET_HW_CFG(lp, (lp->tx_fifo_kb & 0xF) << 16);
//TODO: Figure out what appropriate pause time is
    SMC_SET_FLOW(lp, FLOW_FCPT_ | FLOW_FCEN_);
    SMC_SET_AFC_CFG(lp, lp->afc_cfg);


    /* Set to LED outputs */
    SMC_SET_GPIO_CFG(lp, 0x70070000);

    /*
     * Deassert IRQ for 1*10us for edge type interrupts
     * and drive IRQ pin push-pull
     */
    irq_cfg = (1 << 24) | INT_CFG_IRQ_EN_ | INT_CFG_IRQ_TYPE_;
#ifdef SMC_DYNAMIC_BUS_CONFIG
    if (lp->cfg.irq_polarity)
        irq_cfg |= INT_CFG_IRQ_POL_;
#endif
    SMC_SET_IRQ_CFG(lp, irq_cfg);

    /* clear anything saved */
    if (lp->pending_tx_skb != NULL) {
        dev_kfree_skb (lp->pending_tx_skb);
        lp->pending_tx_skb = NULL;
        dev->stats.tx_errors++;
        dev->stats.tx_aborted_errors++;
    }
}

/*
 * Enable Interrupts, Receive, and Transmit
 */
static void smc911x_enable(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned mask, cfg, cr;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);

    SMC_SET_MAC_ADDR(lp, dev->dev_addr);

    /* Enable TX */
    cfg = SMC_GET_HW_CFG(lp);
    cfg &= HW_CFG_TX_FIF_SZ_ | 0xFFF;
    cfg |= HW_CFG_SF_;
    SMC_SET_HW_CFG(lp, cfg);
    SMC_SET_FIFO_TDA(lp, 0xFF);
    /* Update TX stats on every 64 packets received or every 1 sec */
    SMC_SET_FIFO_TSL(lp, 64);
    SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);

    SMC_GET_MAC_CR(lp, cr);
    cr |= MAC_CR_TXEN_ | MAC_CR_HBDIS_;
    SMC_SET_MAC_CR(lp, cr);
    SMC_SET_TX_CFG(lp, TX_CFG_TX_ON_);

    /* Add 2 byte padding to start of packets */
    SMC_SET_RX_CFG(lp, (2<<8) & RX_CFG_RXDOFF_);

    /* Turn on receiver and enable RX */
    if (cr & MAC_CR_RXEN_)
        DBG(SMC_DEBUG_RX, "%s: Receiver already enabled\n", dev->name);

    SMC_SET_MAC_CR(lp, cr | MAC_CR_RXEN_);

    /* Interrupt on every received packet */
    SMC_SET_FIFO_RSA(lp, 0x01);
    SMC_SET_FIFO_RSL(lp, 0x00);

    /* now, enable interrupts */
    mask = INT_EN_TDFA_EN_ | INT_EN_TSFL_EN_ | INT_EN_RSFL_EN_ |
        INT_EN_GPT_INT_EN_ | INT_EN_RXDFH_INT_EN_ | INT_EN_RXE_EN_ |
        INT_EN_PHY_INT_EN_;
    if (IS_REV_A(lp->revision))
        mask|=INT_EN_RDFL_EN_;
    else {
        mask|=INT_EN_RDFO_EN_;
    }
    SMC_ENABLE_INT(lp, mask);

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

/*
 * this puts the device in an inactive state
 */
static void smc911x_shutdown(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned cr;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", CARDNAME, __func__);

    /* Disable IRQ's */
    SMC_SET_INT_EN(lp, 0);

    /* Turn of Rx and TX */
    spin_lock_irqsave(&lp->lock, flags);
    SMC_GET_MAC_CR(lp, cr);
    cr &= ~(MAC_CR_TXEN_ | MAC_CR_RXEN_ | MAC_CR_HBDIS_);
    SMC_SET_MAC_CR(lp, cr);
    SMC_SET_TX_CFG(lp, TX_CFG_STOP_TX_);
    spin_unlock_irqrestore(&lp->lock, flags);
}

static inline void smc911x_drop_pkt(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int fifo_count, timeout, reg;

    DBG(SMC_DEBUG_FUNC | SMC_DEBUG_RX, "%s: --> %s\n", CARDNAME, __func__);
    fifo_count = SMC_GET_RX_FIFO_INF(lp) & 0xFFFF;
    if (fifo_count <= 4) {
        /* Manually dump the packet data */
        while (fifo_count--)
            SMC_GET_RX_FIFO(lp);
    } else   {
        /* Fast forward through the bad packet */
        SMC_SET_RX_DP_CTRL(lp, RX_DP_CTRL_FFWD_BUSY_);
        timeout=50;
        do {
            udelay(10);
            reg = SMC_GET_RX_DP_CTRL(lp) & RX_DP_CTRL_FFWD_BUSY_;
        } while (--timeout && reg);
        if (timeout == 0) {
            PRINTK("%s: timeout waiting for RX fast forward\n", dev->name);
        }
    }
}

/*
 * This is the procedure to handle the receipt of a packet.
 * It should be called after checking for packet presence in
 * the RX status FIFO.   It must be called with the spin lock
 * already held.
 */
static inline void   smc911x_rcv(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int pkt_len, status;
    struct sk_buff *skb;
    unsigned char *data;

    DBG(SMC_DEBUG_FUNC | SMC_DEBUG_RX, "%s: --> %s\n",
        dev->name, __func__);
    status = SMC_GET_RX_STS_FIFO(lp);
    DBG(SMC_DEBUG_RX, "%s: Rx pkt len %d status 0x%08x\n",
        dev->name, (status & 0x3fff0000) >> 16, status & 0xc000ffff);
    pkt_len = (status & RX_STS_PKT_LEN_) >> 16;
    if (status & RX_STS_ES_) {
        /* Deal with a bad packet */
        dev->stats.rx_errors++;
        if (status & RX_STS_CRC_ERR_)
            dev->stats.rx_crc_errors++;
        else {
            if (status & RX_STS_LEN_ERR_)
                dev->stats.rx_length_errors++;
            if (status & RX_STS_MCAST_)
                dev->stats.multicast++;
        }
        /* Remove the bad packet data from the RX FIFO */
        smc911x_drop_pkt(dev);
    } else {
        /* Receive a valid packet */
        /* Alloc a buffer with extra room for DMA alignment */
        skb = netdev_alloc_skb(dev, pkt_len+32);
        if (unlikely(skb == NULL)) {
            PRINTK( "%s: Low memory, rcvd packet dropped.\n",
                dev->name);
            dev->stats.rx_dropped++;
            smc911x_drop_pkt(dev);
            return;
        }
        /* Align IP header to 32 bits
         * Note that the device is configured to add a 2
         * byte padding to the packet start, so we really
         * want to write to the orignal data pointer */
        data = skb->data;
        skb_reserve(skb, 2);
        skb_put(skb,pkt_len-4);
#ifdef SMC_USE_DMA
        {
        unsigned int fifo;
        /* Lower the FIFO threshold if possible */
        fifo = SMC_GET_FIFO_INT(lp);
        if (fifo & 0xFF) fifo--;
        DBG(SMC_DEBUG_RX, "%s: Setting RX stat FIFO threshold to %d\n",
            dev->name, fifo & 0xff);
        SMC_SET_FIFO_INT(lp, fifo);
        /* Setup RX DMA */
        SMC_SET_RX_CFG(lp, RX_CFG_RX_END_ALGN16_ | ((2<<8) & RX_CFG_RXDOFF_));
        lp->rxdma_active = 1;
        lp->current_rx_skb = skb;
        SMC_PULL_DATA(lp, data, (pkt_len+2+15) & ~15);
        /* Packet processing deferred to DMA RX interrupt */
        }
#else
        SMC_SET_RX_CFG(lp, RX_CFG_RX_END_ALGN4_ | ((2<<8) & RX_CFG_RXDOFF_));
        SMC_PULL_DATA(lp, data, pkt_len+2+3);

        DBG(SMC_DEBUG_PKTS, "%s: Received packet\n", dev->name);
        PRINT_PKT(data, ((pkt_len - 4) <= 64) ? pkt_len - 4 : 64);
        skb->protocol = eth_type_trans(skb, dev);
        netif_rx(skb);
        dev->stats.rx_packets++;
        dev->stats.rx_bytes += pkt_len-4;
#endif
    }
}

/*
 * This is called to actually send a packet to the chip.
 */
static void smc911x_hardware_send_pkt(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    struct sk_buff *skb;
    unsigned int cmdA, cmdB, len;
    unsigned char *buf;

    DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, "%s: --> %s\n", dev->name, __func__);
    BUG_ON(lp->pending_tx_skb == NULL);

    skb = lp->pending_tx_skb;
    lp->pending_tx_skb = NULL;

    /* cmdA {25:24] data alignment [20:16] start offset [10:0] buffer length */
    /* cmdB {31:16] pkt tag [10:0] length */
#ifdef SMC_USE_DMA
    /* 16 byte buffer alignment mode */
    buf = (char*)((u32)(skb->data) & ~0xF);
    len = (skb->len + 0xF + ((u32)skb->data & 0xF)) & ~0xF;
    cmdA = (1<<24) | (((u32)skb->data & 0xF)<<16) |
            TX_CMD_A_INT_FIRST_SEG_ | TX_CMD_A_INT_LAST_SEG_ |
            skb->len;
#else
    buf = (char*)((u32)skb->data & ~0x3);
    len = (skb->len + 3 + ((u32)skb->data & 3)) & ~0x3;
    cmdA = (((u32)skb->data & 0x3) << 16) |
            TX_CMD_A_INT_FIRST_SEG_ | TX_CMD_A_INT_LAST_SEG_ |
            skb->len;
#endif
    /* tag is packet length so we can use this in stats update later */
    cmdB = (skb->len  << 16) | (skb->len & 0x7FF);

    DBG(SMC_DEBUG_TX, "%s: TX PKT LENGTH 0x%04x (%d) BUF 0x%p CMDA 0x%08x CMDB 0x%08x\n",
         dev->name, len, len, buf, cmdA, cmdB);
    SMC_SET_TX_FIFO(lp, cmdA);
    SMC_SET_TX_FIFO(lp, cmdB);

    DBG(SMC_DEBUG_PKTS, "%s: Transmitted packet\n", dev->name);
    PRINT_PKT(buf, len <= 64 ? len : 64);

    /* Send pkt via PIO or DMA */
#ifdef SMC_USE_DMA
    lp->current_tx_skb = skb;
    SMC_PUSH_DATA(lp, buf, len);
    /* DMA complete IRQ will free buffer and set jiffies */
#else
    SMC_PUSH_DATA(lp, buf, len);
    dev->trans_start = jiffies;
    dev_kfree_skb_irq(skb);
#endif
    if (!lp->tx_throttle) {
        netif_wake_queue(dev);
    }
    SMC_ENABLE_INT(lp, INT_EN_TDFA_EN_ | INT_EN_TSFL_EN_);
}

/*
 * Since I am not sure if I will have enough room in the chip's ram
 * to store the packet, I call this routine which either sends it
 * now, or set the card to generates an interrupt when ready
 * for the packet.
 */
static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int free;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, "%s: --> %s\n",
        dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);

    BUG_ON(lp->pending_tx_skb != NULL);

    free = SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TDFREE_;
    DBG(SMC_DEBUG_TX, "%s: TX free space %d\n", dev->name, free);

    /* Turn off the flow when running out of space in FIFO */
    if (free <= SMC911X_TX_FIFO_LOW_THRESHOLD) {
        DBG(SMC_DEBUG_TX, "%s: Disabling data flow due to low FIFO space (%d)\n",
            dev->name, free);
        /* Reenable when at least 1 packet of size MTU present */
        SMC_SET_FIFO_TDA(lp, (SMC911X_TX_FIFO_LOW_THRESHOLD)/64);
        lp->tx_throttle = 1;
        netif_stop_queue(dev);
    }

    /* Drop packets when we run out of space in TX FIFO
     * Account for overhead required for:
     *
     *    Tx command words           8 bytes
     *    Start offset               15 bytes
     *    End padding                15 bytes
     */
    if (unlikely(free < (skb->len + 8 + 15 + 15))) {
        printk("%s: No Tx free space %d < %d\n",
            dev->name, free, skb->len);
        lp->pending_tx_skb = NULL;
        dev->stats.tx_errors++;
        dev->stats.tx_dropped++;
        spin_unlock_irqrestore(&lp->lock, flags);
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
    }

#ifdef SMC_USE_DMA
    {
        /* If the DMA is already running then defer this packet Tx until
         * the DMA IRQ starts it
         */
        if (lp->txdma_active) {
            DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: Tx DMA running, deferring packet\n", dev->name);
            lp->pending_tx_skb = skb;
            netif_stop_queue(dev);
            spin_unlock_irqrestore(&lp->lock, flags);
            return NETDEV_TX_OK;
        } else {
            DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: Activating Tx DMA\n", dev->name);
            lp->txdma_active = 1;
        }
    }
#endif
    lp->pending_tx_skb = skb;
    smc911x_hardware_send_pkt(dev);
    spin_unlock_irqrestore(&lp->lock, flags);

    return NETDEV_TX_OK;
}

/*
 * This handles a TX status interrupt, which is only called when:
 * - a TX error occurred, or
 * - TX of a packet completed.
 */
static void smc911x_tx(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int tx_status;

    DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, "%s: --> %s\n",
        dev->name, __func__);

    /* Collect the TX status */
    while (((SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TSUSED_) >> 16) != 0) {
        DBG(SMC_DEBUG_TX, "%s: Tx stat FIFO used 0x%04x\n",
            dev->name,
            (SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TSUSED_) >> 16);
        tx_status = SMC_GET_TX_STS_FIFO(lp);
        dev->stats.tx_packets++;
        dev->stats.tx_bytes+=tx_status>>16;
        DBG(SMC_DEBUG_TX, "%s: Tx FIFO tag 0x%04x status 0x%04x\n",
            dev->name, (tx_status & 0xffff0000) >> 16,
            tx_status & 0x0000ffff);
        /* count Tx errors, but ignore lost carrier errors when in
         * full-duplex mode */
        if ((tx_status & TX_STS_ES_) && !(lp->ctl_rfduplx &&
            !(tx_status & 0x00000306))) {
            dev->stats.tx_errors++;
        }
        if (tx_status & TX_STS_MANY_COLL_) {
            dev->stats.collisions+=16;
            dev->stats.tx_aborted_errors++;
        } else {
            dev->stats.collisions+=(tx_status & TX_STS_COLL_CNT_) >> 3;
        }
        /* carrier error only has meaning for half-duplex communication */
        if ((tx_status & (TX_STS_LOC_ | TX_STS_NO_CARR_)) &&
            !lp->ctl_rfduplx) {
            dev->stats.tx_carrier_errors++;
        }
        if (tx_status & TX_STS_LATE_COLL_) {
            dev->stats.collisions++;
            dev->stats.tx_aborted_errors++;
        }
    }
}


/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
/*
 * Reads a register from the MII Management serial interface
 */

static int smc911x_phy_read(struct net_device *dev, int phyaddr, int phyreg)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int phydata;

    SMC_GET_MII(lp, phyreg, phyaddr, phydata);

    DBG(SMC_DEBUG_MISC, "%s: phyaddr=0x%x, phyreg=0x%02x, phydata=0x%04x\n",
        __func__, phyaddr, phyreg, phydata);
    return phydata;
}


/*
 * Writes a register to the MII Management serial interface
 */
static void smc911x_phy_write(struct net_device *dev, int phyaddr, int phyreg,
            int phydata)
{
    struct smc911x_local *lp = netdev_priv(dev);

    DBG(SMC_DEBUG_MISC, "%s: phyaddr=0x%x, phyreg=0x%x, phydata=0x%x\n",
        __func__, phyaddr, phyreg, phydata);

    SMC_SET_MII(lp, phyreg, phyaddr, phydata);
}

/*
 * Finds and reports the PHY address (115 and 117 have external
 * PHY interface 118 has internal only
 */
static void smc911x_phy_detect(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int phyaddr;
    unsigned int cfg, id1, id2;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    lp->phy_type = 0;

    /*
     * Scan all 32 PHY addresses if necessary, starting at
     * PHY#1 to PHY#31, and then PHY#0 last.
     */
    switch(lp->version) {
        case CHIP_9115:
        case CHIP_9117:
        case CHIP_9215:
        case CHIP_9217:
            cfg = SMC_GET_HW_CFG(lp);
            if (cfg & HW_CFG_EXT_PHY_DET_) {
                cfg &= ~HW_CFG_PHY_CLK_SEL_;
                cfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
                SMC_SET_HW_CFG(lp, cfg);
                udelay(10); /* Wait for clocks to stop */

                cfg |= HW_CFG_EXT_PHY_EN_;
                SMC_SET_HW_CFG(lp, cfg);
                udelay(10); /* Wait for clocks to stop */

                cfg &= ~HW_CFG_PHY_CLK_SEL_;
                cfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
                SMC_SET_HW_CFG(lp, cfg);
                udelay(10); /* Wait for clocks to stop */

                cfg |= HW_CFG_SMI_SEL_;
                SMC_SET_HW_CFG(lp, cfg);

                for (phyaddr = 1; phyaddr < 32; ++phyaddr) {

                    /* Read the PHY identifiers */
                    SMC_GET_PHY_ID1(lp, phyaddr & 31, id1);
                    SMC_GET_PHY_ID2(lp, phyaddr & 31, id2);

                    /* Make sure it is a valid identifier */
                    if (id1 != 0x0000 && id1 != 0xffff &&
                        id1 != 0x8000 && id2 != 0x0000 &&
                        id2 != 0xffff && id2 != 0x8000) {
                        /* Save the PHY's address */
                        lp->mii.phy_id = phyaddr & 31;
                        lp->phy_type = id1 << 16 | id2;
                        break;
                    }
                }
                if (phyaddr < 32)
                    /* Found an external PHY */
                    break;
            }
        default:
            /* Internal media only */
            SMC_GET_PHY_ID1(lp, 1, id1);
            SMC_GET_PHY_ID2(lp, 1, id2);
            /* Save the PHY's address */
            lp->mii.phy_id = 1;
            lp->phy_type = id1 << 16 | id2;
    }

    DBG(SMC_DEBUG_MISC, "%s: phy_id1=0x%x, phy_id2=0x%x phyaddr=0x%d\n",
        dev->name, id1, id2, lp->mii.phy_id);
}

/*
 * Sets the PHY to a configuration as determined by the user.
 * Called with spin_lock held.
 */
static int smc911x_phy_fixed(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int phyaddr = lp->mii.phy_id;
    int bmcr;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    /* Enter Link Disable state */
    SMC_GET_PHY_BMCR(lp, phyaddr, bmcr);
    bmcr |= BMCR_PDOWN;
    SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

    /*
     * Set our fixed capabilities
     * Disable auto-negotiation
     */
    bmcr &= ~BMCR_ANENABLE;
    if (lp->ctl_rfduplx)
        bmcr |= BMCR_FULLDPLX;

    if (lp->ctl_rspeed == 100)
        bmcr |= BMCR_SPEED100;

    /* Write our capabilities to the phy control register */
    SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

    /* Re-Configure the Receive/Phy Control register */
    bmcr &= ~BMCR_PDOWN;
    SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

    return 1;
}

static int smc911x_phy_reset(struct net_device *dev, int phy)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int timeout;
    unsigned long flags;
    unsigned int reg;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s()\n", dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);
    reg = SMC_GET_PMT_CTRL(lp);
    reg &= ~0xfffff030;
    reg |= PMT_CTRL_PHY_RST_;
    SMC_SET_PMT_CTRL(lp, reg);
    spin_unlock_irqrestore(&lp->lock, flags);
    for (timeout = 2; timeout; timeout--) {
        msleep(50);
        spin_lock_irqsave(&lp->lock, flags);
        reg = SMC_GET_PMT_CTRL(lp);
        spin_unlock_irqrestore(&lp->lock, flags);
        if (!(reg & PMT_CTRL_PHY_RST_)) {
            /* extra delay required because the phy may
             * not be completed with its reset
             * when PHY_BCR_RESET_ is cleared. 256us
             * should suffice, but use 500us to be safe
             */
            udelay(500);
        break;
        }
    }

    return reg & PMT_CTRL_PHY_RST_;
}

static void smc911x_phy_powerdown(struct net_device *dev, int phy)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int bmcr;

    /* Enter Link Disable state */
    SMC_GET_PHY_BMCR(lp, phy, bmcr);
    bmcr |= BMCR_PDOWN;
    SMC_SET_PHY_BMCR(lp, phy, bmcr);
}

static void smc911x_phy_check_media(struct net_device *dev, int init)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int phyaddr = lp->mii.phy_id;
    unsigned int bmcr, cr;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    if (mii_check_media(&lp->mii, netif_msg_link(lp), init)) {
        /* duplex state has changed */
        SMC_GET_PHY_BMCR(lp, phyaddr, bmcr);
        SMC_GET_MAC_CR(lp, cr);
        if (lp->mii.full_duplex) {
            DBG(SMC_DEBUG_MISC, "%s: Configuring for full-duplex mode\n", dev->name);
            bmcr |= BMCR_FULLDPLX;
            cr |= MAC_CR_RCVOWN_;
        } else {
            DBG(SMC_DEBUG_MISC, "%s: Configuring for half-duplex mode\n", dev->name);
            bmcr &= ~BMCR_FULLDPLX;
            cr &= ~MAC_CR_RCVOWN_;
        }
        SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);
        SMC_SET_MAC_CR(lp, cr);
    }
}

/*
 * Configures the specified PHY through the MII management interface
 * using Autonegotiation.
 * Calls smc911x_phy_fixed() if the user has requested a certain config.
 * If RPC ANEG bit is set, the media selection is dependent purely on
 * the selection by the MII (either in the MII BMCR reg or the result
 * of autonegotiation.)  If the RPC ANEG bit is cleared, the selection
 * is controlled by the RPC SPEED and RPC DPLX bits.
 */
static void smc911x_phy_configure(struct work_struct *work)
{
    struct smc911x_local *lp = container_of(work, struct smc911x_local,
                        phy_configure);
    struct net_device *dev = lp->netdev;
    int phyaddr = lp->mii.phy_id;
    int my_phy_caps; /* My PHY capabilities */
    int my_ad_caps; /* My Advertised capabilities */
    int status;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s()\n", dev->name, __func__);

    /*
     * We should not be called if phy_type is zero.
     */
    if (lp->phy_type == 0)
        return;

    if (smc911x_phy_reset(dev, phyaddr)) {
        printk("%s: PHY reset timed out\n", dev->name);
        return;
    }
    spin_lock_irqsave(&lp->lock, flags);

    /*
     * Enable PHY Interrupts (for register 18)
     * Interrupts listed here are enabled
     */
    SMC_SET_PHY_INT_MASK(lp, phyaddr, PHY_INT_MASK_ENERGY_ON_ |
         PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_REMOTE_FAULT_ |
         PHY_INT_MASK_LINK_DOWN_);

    /* If the user requested no auto neg, then go set his request */
    if (lp->mii.force_media) {
        smc911x_phy_fixed(dev);
        goto smc911x_phy_configure_exit;
    }

    /* Copy our capabilities from MII_BMSR to MII_ADVERTISE */
    SMC_GET_PHY_BMSR(lp, phyaddr, my_phy_caps);
    if (!(my_phy_caps & BMSR_ANEGCAPABLE)) {
        printk(KERN_INFO "Auto negotiation NOT supported\n");
        smc911x_phy_fixed(dev);
        goto smc911x_phy_configure_exit;
    }

    /* CSMA capable w/ both pauses */
    my_ad_caps = ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;

    if (my_phy_caps & BMSR_100BASE4)
        my_ad_caps |= ADVERTISE_100BASE4;
    if (my_phy_caps & BMSR_100FULL)
        my_ad_caps |= ADVERTISE_100FULL;
    if (my_phy_caps & BMSR_100HALF)
        my_ad_caps |= ADVERTISE_100HALF;
    if (my_phy_caps & BMSR_10FULL)
        my_ad_caps |= ADVERTISE_10FULL;
    if (my_phy_caps & BMSR_10HALF)
        my_ad_caps |= ADVERTISE_10HALF;

    /* Disable capabilities not selected by our user */
    if (lp->ctl_rspeed != 100)
        my_ad_caps &= ~(ADVERTISE_100BASE4|ADVERTISE_100FULL|ADVERTISE_100HALF);

     if (!lp->ctl_rfduplx)
        my_ad_caps &= ~(ADVERTISE_100FULL|ADVERTISE_10FULL);

    /* Update our Auto-Neg Advertisement Register */
    SMC_SET_PHY_MII_ADV(lp, phyaddr, my_ad_caps);
    lp->mii.advertising = my_ad_caps;

    /*
     * Read the register back.   Without this, it appears that when
     * auto-negotiation is restarted, sometimes it isn't ready and
     * the link does not come up.
     */
    udelay(10);
    SMC_GET_PHY_MII_ADV(lp, phyaddr, status);

    DBG(SMC_DEBUG_MISC, "%s: phy caps=0x%04x\n", dev->name, my_phy_caps);
    DBG(SMC_DEBUG_MISC, "%s: phy advertised caps=0x%04x\n", dev->name, my_ad_caps);

    /* Restart auto-negotiation process in order to advertise my caps */
    SMC_SET_PHY_BMCR(lp, phyaddr, BMCR_ANENABLE | BMCR_ANRESTART);

    smc911x_phy_check_media(dev, 1);

smc911x_phy_configure_exit:
    spin_unlock_irqrestore(&lp->lock, flags);
}

/*
 * smc911x_phy_interrupt
 *
 * Purpose:  Handle interrupts relating to PHY register 18. This is
 *   called from the "hard" interrupt handler under our private spinlock.
 */
static void smc911x_phy_interrupt(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int phyaddr = lp->mii.phy_id;
    int status;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    if (lp->phy_type == 0)
        return;

    smc911x_phy_check_media(dev, 0);
    /* read to clear status bits */
    SMC_GET_PHY_INT_SRC(lp, phyaddr,status);
    DBG(SMC_DEBUG_MISC, "%s: PHY interrupt status 0x%04x\n",
        dev->name, status & 0xffff);
    DBG(SMC_DEBUG_MISC, "%s: AFC_CFG 0x%08x\n",
        dev->name, SMC_GET_AFC_CFG(lp));
}

/*--- END PHY CONTROL AND CONFIGURATION-------------------------------------*/

/*
 * This is the main routine of the driver, to handle the device when
 * it needs some attention.
 */
static irqreturn_t smc911x_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = dev_id;
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int status, mask, timeout;
    unsigned int rx_overrun=0, cr, pkts;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);

    /* Spurious interrupt check */
    if ((SMC_GET_IRQ_CFG(lp) & (INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) !=
        (INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) {
        spin_unlock_irqrestore(&lp->lock, flags);
        return IRQ_NONE;
    }

    mask = SMC_GET_INT_EN(lp);
    SMC_SET_INT_EN(lp, 0);

    /* set a timeout value, so I don't stay here forever */
    timeout = 8;


    do {
        status = SMC_GET_INT(lp);

        DBG(SMC_DEBUG_MISC, "%s: INT 0x%08x MASK 0x%08x OUTSIDE MASK 0x%08x\n",
            dev->name, status, mask, status & ~mask);

        status &= mask;
        if (!status)
            break;

        /* Handle SW interrupt condition */
        if (status & INT_STS_SW_INT_) {
            SMC_ACK_INT(lp, INT_STS_SW_INT_);
            mask &= ~INT_EN_SW_INT_EN_;
        }
        /* Handle various error conditions */
        if (status & INT_STS_RXE_) {
            SMC_ACK_INT(lp, INT_STS_RXE_);
            dev->stats.rx_errors++;
        }
        if (status & INT_STS_RXDFH_INT_) {
            SMC_ACK_INT(lp, INT_STS_RXDFH_INT_);
            dev->stats.rx_dropped+=SMC_GET_RX_DROP(lp);
         }
        /* Undocumented interrupt-what is the right thing to do here? */
        if (status & INT_STS_RXDF_INT_) {
            SMC_ACK_INT(lp, INT_STS_RXDF_INT_);
        }

        /* Rx Data FIFO exceeds set level */
        if (status & INT_STS_RDFL_) {
            if (IS_REV_A(lp->revision)) {
                rx_overrun=1;
                SMC_GET_MAC_CR(lp, cr);
                cr &= ~MAC_CR_RXEN_;
                SMC_SET_MAC_CR(lp, cr);
                DBG(SMC_DEBUG_RX, "%s: RX overrun\n", dev->name);
                dev->stats.rx_errors++;
                dev->stats.rx_fifo_errors++;
            }
            SMC_ACK_INT(lp, INT_STS_RDFL_);
        }
        if (status & INT_STS_RDFO_) {
            if (!IS_REV_A(lp->revision)) {
                SMC_GET_MAC_CR(lp, cr);
                cr &= ~MAC_CR_RXEN_;
                SMC_SET_MAC_CR(lp, cr);
                rx_overrun=1;
                DBG(SMC_DEBUG_RX, "%s: RX overrun\n", dev->name);
                dev->stats.rx_errors++;
                dev->stats.rx_fifo_errors++;
            }
            SMC_ACK_INT(lp, INT_STS_RDFO_);
        }
        /* Handle receive condition */
        if ((status & INT_STS_RSFL_) || rx_overrun) {
            unsigned int fifo;
            DBG(SMC_DEBUG_RX, "%s: RX irq\n", dev->name);
            fifo = SMC_GET_RX_FIFO_INF(lp);
            pkts = (fifo & RX_FIFO_INF_RXSUSED_) >> 16;
            DBG(SMC_DEBUG_RX, "%s: Rx FIFO pkts %d, bytes %d\n",
                dev->name, pkts, fifo & 0xFFFF );
            if (pkts != 0) {
#ifdef SMC_USE_DMA
                unsigned int fifo;
                if (lp->rxdma_active){
                    DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA,
                        "%s: RX DMA active\n", dev->name);
                    /* The DMA is already running so up the IRQ threshold */
                    fifo = SMC_GET_FIFO_INT(lp) & ~0xFF;
                    fifo |= pkts & 0xFF;
                    DBG(SMC_DEBUG_RX,
                        "%s: Setting RX stat FIFO threshold to %d\n",
                        dev->name, fifo & 0xff);
                    SMC_SET_FIFO_INT(lp, fifo);
                } else
#endif
                smc911x_rcv(dev);
            }
            SMC_ACK_INT(lp, INT_STS_RSFL_);
        }
        /* Handle transmit FIFO available */
        if (status & INT_STS_TDFA_) {
            DBG(SMC_DEBUG_TX, "%s: TX data FIFO space available irq\n", dev->name);
            SMC_SET_FIFO_TDA(lp, 0xFF);
            lp->tx_throttle = 0;
#ifdef SMC_USE_DMA
            if (!lp->txdma_active)
#endif
                netif_wake_queue(dev);
            SMC_ACK_INT(lp, INT_STS_TDFA_);
        }
        /* Handle transmit done condition */
#if 1
        if (status & (INT_STS_TSFL_ | INT_STS_GPT_INT_)) {
            DBG(SMC_DEBUG_TX | SMC_DEBUG_MISC,
                "%s: Tx stat FIFO limit (%d) /GPT irq\n",
                dev->name, (SMC_GET_FIFO_INT(lp) & 0x00ff0000) >> 16);
            smc911x_tx(dev);
            SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);
            SMC_ACK_INT(lp, INT_STS_TSFL_);
            SMC_ACK_INT(lp, INT_STS_TSFL_ | INT_STS_GPT_INT_);
        }
#else
        if (status & INT_STS_TSFL_) {
            DBG(SMC_DEBUG_TX, "%s: TX status FIFO limit (%d) irq\n", dev->name, );
            smc911x_tx(dev);
            SMC_ACK_INT(lp, INT_STS_TSFL_);
        }

        if (status & INT_STS_GPT_INT_) {
            DBG(SMC_DEBUG_RX, "%s: IRQ_CFG 0x%08x FIFO_INT 0x%08x RX_CFG 0x%08x\n",
                dev->name,
                SMC_GET_IRQ_CFG(lp),
                SMC_GET_FIFO_INT(lp),
                SMC_GET_RX_CFG(lp));
            DBG(SMC_DEBUG_RX, "%s: Rx Stat FIFO Used 0x%02x "
                "Data FIFO Used 0x%04x Stat FIFO 0x%08x\n",
                dev->name,
                (SMC_GET_RX_FIFO_INF(lp) & 0x00ff0000) >> 16,
                SMC_GET_RX_FIFO_INF(lp) & 0xffff,
                SMC_GET_RX_STS_FIFO_PEEK(lp));
            SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);
            SMC_ACK_INT(lp, INT_STS_GPT_INT_);
        }
#endif

        /* Handle PHY interrupt condition */
        if (status & INT_STS_PHY_INT_) {
            DBG(SMC_DEBUG_MISC, "%s: PHY irq\n", dev->name);
            smc911x_phy_interrupt(dev);
            SMC_ACK_INT(lp, INT_STS_PHY_INT_);
        }
    } while (--timeout);

    /* restore mask state */
    SMC_SET_INT_EN(lp, mask);

    DBG(SMC_DEBUG_MISC, "%s: Interrupt done (%d loops)\n",
        dev->name, 8-timeout);

    spin_unlock_irqrestore(&lp->lock, flags);

    return IRQ_HANDLED;
}

#ifdef SMC_USE_DMA
static void
smc911x_tx_dma_irq(int dma, void *data)
{
    struct net_device *dev = (struct net_device *)data;
    struct smc911x_local *lp = netdev_priv(dev);
    struct sk_buff *skb = lp->current_tx_skb;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: TX DMA irq handler\n", dev->name);
    /* Clear the DMA interrupt sources */
    SMC_DMA_ACK_IRQ(dev, dma);
    BUG_ON(skb == NULL);
    dma_unmap_single(NULL, tx_dmabuf, tx_dmalen, DMA_TO_DEVICE);
    dev->trans_start = jiffies;
    dev_kfree_skb_irq(skb);
    lp->current_tx_skb = NULL;
    if (lp->pending_tx_skb != NULL)
        smc911x_hardware_send_pkt(dev);
    else {
        DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA,
            "%s: No pending Tx packets. DMA disabled\n", dev->name);
        spin_lock_irqsave(&lp->lock, flags);
        lp->txdma_active = 0;
        if (!lp->tx_throttle) {
            netif_wake_queue(dev);
        }
        spin_unlock_irqrestore(&lp->lock, flags);
    }

    DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA,
        "%s: TX DMA irq completed\n", dev->name);
}
static void
smc911x_rx_dma_irq(int dma, void *data)
{
    struct net_device *dev = (struct net_device *)data;
    unsigned long ioaddr = dev->base_addr;
    struct smc911x_local *lp = netdev_priv(dev);
    struct sk_buff *skb = lp->current_rx_skb;
    unsigned long flags;
    unsigned int pkts;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);
    DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA, "%s: RX DMA irq handler\n", dev->name);
    /* Clear the DMA interrupt sources */
    SMC_DMA_ACK_IRQ(dev, dma);
    dma_unmap_single(NULL, rx_dmabuf, rx_dmalen, DMA_FROM_DEVICE);
    BUG_ON(skb == NULL);
    lp->current_rx_skb = NULL;
    PRINT_PKT(skb->data, skb->len);
    skb->protocol = eth_type_trans(skb, dev);
    dev->stats.rx_packets++;
    dev->stats.rx_bytes += skb->len;
    netif_rx(skb);

    spin_lock_irqsave(&lp->lock, flags);
    pkts = (SMC_GET_RX_FIFO_INF(lp) & RX_FIFO_INF_RXSUSED_) >> 16;
    if (pkts != 0) {
        smc911x_rcv(dev);
    }else {
        lp->rxdma_active = 0;
    }
    spin_unlock_irqrestore(&lp->lock, flags);
    DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA,
        "%s: RX DMA irq completed. DMA RX FIFO PKTS %d\n",
        dev->name, pkts);
}
#endif   /* SMC_USE_DMA */

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void smc911x_poll_controller(struct net_device *dev)
{
    disable_irq(dev->irq);
    smc911x_interrupt(dev->irq, dev);
    enable_irq(dev->irq);
}
#endif

/* Our watchdog timed out. Called by the networking layer */
static void smc911x_timeout(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int status, mask;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);
    status = SMC_GET_INT(lp);
    mask = SMC_GET_INT_EN(lp);
    spin_unlock_irqrestore(&lp->lock, flags);
    DBG(SMC_DEBUG_MISC, "%s: INT 0x%02x MASK 0x%02x\n",
        dev->name, status, mask);

    /* Dump the current TX FIFO contents and restart */
    mask = SMC_GET_TX_CFG(lp);
    SMC_SET_TX_CFG(lp, mask | TX_CFG_TXS_DUMP_ | TX_CFG_TXD_DUMP_);
    /*
     * Reconfiguring the PHY doesn't seem like a bad idea here, but
     * smc911x_phy_configure() calls msleep() which calls schedule_timeout()
     * which calls schedule().   Hence we use a work queue.
     */
    if (lp->phy_type != 0)
        schedule_work(&lp->phy_configure);

    /* We can accept TX packets again */
    dev->trans_start = jiffies; /* prevent tx timeout */
    netif_wake_queue(dev);
}

/*
 * This routine will, depending on the values passed to it,
 * either make it accept multicast packets, go into
 * promiscuous mode (for TCPDUMP and cousins) or accept
 * a select set of multicast packets
 */
static void smc911x_set_multicast_list(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int multicast_table[2];
    unsigned int mcr, update_multicast = 0;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    spin_lock_irqsave(&lp->lock, flags);
    SMC_GET_MAC_CR(lp, mcr);
    spin_unlock_irqrestore(&lp->lock, flags);

    if (dev->flags & IFF_PROMISC) {

        DBG(SMC_DEBUG_MISC, "%s: RCR_PRMS\n", dev->name);
        mcr |= MAC_CR_PRMS_;
    }
    /*
     * Here, I am setting this to accept all multicast packets.
     * I don't need to zero the multicast table, because the flag is
     * checked before the table is
     */
    else if (dev->flags & IFF_ALLMULTI || netdev_mc_count(dev) > 16) {
        DBG(SMC_DEBUG_MISC, "%s: RCR_ALMUL\n", dev->name);
        mcr |= MAC_CR_MCPAS_;
    }

    /*
     * This sets the internal hardware table to filter out unwanted
     * multicast packets before they take up memory.
     *
     * The SMC chip uses a hash table where the high 6 bits of the CRC of
     * address are the offset into the table.   If that bit is 1, then the
     * multicast packet is accepted.  Otherwise, it's dropped silently.
     *
     * To use the 6 bits as an offset into the table, the high 1 bit is
     * the number of the 32 bit register, while the low 5 bits are the bit
     * within that register.
     */
    else if (!netdev_mc_empty(dev)) {
        struct netdev_hw_addr *ha;

        /* Set the Hash perfec mode */
        mcr |= MAC_CR_HPFILT_;

        /* start with a table of all zeros: reject all */
        memset(multicast_table, 0, sizeof(multicast_table));

        netdev_for_each_mc_addr(ha, dev) {
            u32 position;

            /* upper 6 bits are used as hash index */
            position = ether_crc(ETH_ALEN, ha->addr)>>26;

            multicast_table[position>>5] |= 1 << (position&0x1f);
        }

        /* be sure I get rid of flags I might have set */
        mcr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);

        /* now, the table can be loaded into the chipset */
        update_multicast = 1;
    } else   {
        DBG(SMC_DEBUG_MISC, "%s: ~(MAC_CR_PRMS_|MAC_CR_MCPAS_)\n",
            dev->name);
        mcr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);

        /*
         * since I'm disabling all multicast entirely, I need to
         * clear the multicast list
         */
        memset(multicast_table, 0, sizeof(multicast_table));
        update_multicast = 1;
    }

    spin_lock_irqsave(&lp->lock, flags);
    SMC_SET_MAC_CR(lp, mcr);
    if (update_multicast) {
        DBG(SMC_DEBUG_MISC,
            "%s: update mcast hash table 0x%08x 0x%08x\n",
            dev->name, multicast_table[0], multicast_table[1]);
        SMC_SET_HASHL(lp, multicast_table[0]);
        SMC_SET_HASHH(lp, multicast_table[1]);
    }
    spin_unlock_irqrestore(&lp->lock, flags);
}


/*
 * Open and Initialize the board
 *
 * Set up everything, reset the card, etc..
 */
static int
smc911x_open(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    /*
     * Check that the address is valid.  If its not, refuse
     * to bring the device up.   The user must specify an
     * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
     */
    if (!is_valid_ether_addr(dev->dev_addr)) {
        PRINTK("%s: no valid ethernet hw addr\n", __func__);
        return -EINVAL;
    }

    /* reset the hardware */
    smc911x_reset(dev);

    /* Configure the PHY, initialize the link state */
    smc911x_phy_configure(&lp->phy_configure);

    /* Turn on Tx + Rx */
    smc911x_enable(dev);

    netif_start_queue(dev);

    return 0;
}

/*
 * smc911x_close
 *
 * this makes the board clean up everything that it can
 * and not talk to the outside world.    Caused by
 * an 'ifconfig ethX down'
 */
static int smc911x_close(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    netif_stop_queue(dev);
    netif_carrier_off(dev);

    /* clear everything */
    smc911x_shutdown(dev);

    if (lp->phy_type != 0) {
        /* We need to ensure that no calls to
         * smc911x_phy_configure are pending.
         */
        cancel_work_sync(&lp->phy_configure);
        smc911x_phy_powerdown(dev, lp->mii.phy_id);
    }

    if (lp->pending_tx_skb) {
        dev_kfree_skb(lp->pending_tx_skb);
        lp->pending_tx_skb = NULL;
    }

    return 0;
}

/*
 * Ethtool support
 */
static int
smc911x_ethtool_getsettings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret, status;
    unsigned long flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);
    cmd->maxtxpkt = 1;
    cmd->maxrxpkt = 1;

    if (lp->phy_type != 0) {
        spin_lock_irqsave(&lp->lock, flags);
        ret = mii_ethtool_gset(&lp->mii, cmd);
        spin_unlock_irqrestore(&lp->lock, flags);
    } else {
        cmd->supported = SUPPORTED_10baseT_Half |
                SUPPORTED_10baseT_Full |
                SUPPORTED_TP | SUPPORTED_AUI;

        if (lp->ctl_rspeed == 10)
            ethtool_cmd_speed_set(cmd, SPEED_10);
        else if (lp->ctl_rspeed == 100)
            ethtool_cmd_speed_set(cmd, SPEED_100);

        cmd->autoneg = AUTONEG_DISABLE;
        if (lp->mii.phy_id==1)
            cmd->transceiver = XCVR_INTERNAL;
        else
            cmd->transceiver = XCVR_EXTERNAL;
        cmd->port = 0;
        SMC_GET_PHY_SPECIAL(lp, lp->mii.phy_id, status);
        cmd->duplex =
            (status & (PHY_SPECIAL_SPD_10FULL_ | PHY_SPECIAL_SPD_100FULL_)) ?
                DUPLEX_FULL : DUPLEX_HALF;
        ret = 0;
    }

    return ret;
}

static int
smc911x_ethtool_setsettings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret;
    unsigned long flags;

    if (lp->phy_type != 0) {
        spin_lock_irqsave(&lp->lock, flags);
        ret = mii_ethtool_sset(&lp->mii, cmd);
        spin_unlock_irqrestore(&lp->lock, flags);
    } else {
        if (cmd->autoneg != AUTONEG_DISABLE ||
            cmd->speed != SPEED_10 ||
            (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL) ||
            (cmd->port != PORT_TP && cmd->port != PORT_AUI))
            return -EINVAL;

        lp->ctl_rfduplx = cmd->duplex == DUPLEX_FULL;

        ret = 0;
    }

    return ret;
}

static void
smc911x_ethtool_getdrvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
    strncpy(info->driver, CARDNAME, sizeof(info->driver));
    strncpy(info->version, version, sizeof(info->version));
    strncpy(info->bus_info, dev_name(dev->dev.parent), sizeof(info->bus_info));
}

static int smc911x_ethtool_nwayreset(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret = -EINVAL;
    unsigned long flags;

    if (lp->phy_type != 0) {
        spin_lock_irqsave(&lp->lock, flags);
        ret = mii_nway_restart(&lp->mii);
        spin_unlock_irqrestore(&lp->lock, flags);
    }

    return ret;
}

static u32 smc911x_ethtool_getmsglevel(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    return lp->msg_enable;
}

static void smc911x_ethtool_setmsglevel(struct net_device *dev, u32 level)
{
    struct smc911x_local *lp = netdev_priv(dev);
    lp->msg_enable = level;
}

static int smc911x_ethtool_getregslen(struct net_device *dev)
{
    /* System regs + MAC regs + PHY regs */
    return (((E2P_CMD - ID_REV)/4 + 1) +
            (WUCSR - MAC_CR)+1 + 32) * sizeof(u32);
}

static void smc911x_ethtool_getregs(struct net_device *dev,
                                         struct ethtool_regs* regs, void *buf)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned long flags;
    u32 reg,i,j=0;
    u32 *data = (u32*)buf;

    regs->version = lp->version;
    for(i=ID_REV;i<=E2P_CMD;i+=4) {
        data[j++] = SMC_inl(lp, i);
    }
    for(i=MAC_CR;i<=WUCSR;i++) {
        spin_lock_irqsave(&lp->lock, flags);
        SMC_GET_MAC_CSR(lp, i, reg);
        spin_unlock_irqrestore(&lp->lock, flags);
        data[j++] = reg;
    }
    for(i=0;i<=31;i++) {
        spin_lock_irqsave(&lp->lock, flags);
        SMC_GET_MII(lp, i, lp->mii.phy_id, reg);
        spin_unlock_irqrestore(&lp->lock, flags);
        data[j++] = reg & 0xFFFF;
    }
}

static int smc911x_ethtool_wait_eeprom_ready(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    unsigned int timeout;
    int e2p_cmd;

    e2p_cmd = SMC_GET_E2P_CMD(lp);
    for(timeout=10;(e2p_cmd & E2P_CMD_EPC_BUSY_) && timeout; timeout--) {
        if (e2p_cmd & E2P_CMD_EPC_TIMEOUT_) {
            PRINTK("%s: %s timeout waiting for EEPROM to respond\n",
                dev->name, __func__);
            return -EFAULT;
        }
        mdelay(1);
        e2p_cmd = SMC_GET_E2P_CMD(lp);
    }
    if (timeout == 0) {
        PRINTK("%s: %s timeout waiting for EEPROM CMD not busy\n",
            dev->name, __func__);
        return -ETIMEDOUT;
    }
    return 0;
}

static inline int smc911x_ethtool_write_eeprom_cmd(struct net_device *dev,
                                                    int cmd, int addr)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret;

    if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
        return ret;
    SMC_SET_E2P_CMD(lp, E2P_CMD_EPC_BUSY_ |
        ((cmd) & (0x7<<28)) |
        ((addr) & 0xFF));
    return 0;
}

static inline int smc911x_ethtool_read_eeprom_byte(struct net_device *dev,
                                                    u8 *data)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret;

    if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
        return ret;
    *data = SMC_GET_E2P_DATA(lp);
    return 0;
}

static inline int smc911x_ethtool_write_eeprom_byte(struct net_device *dev,
                                                     u8 data)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int ret;

    if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
        return ret;
    SMC_SET_E2P_DATA(lp, data);
    return 0;
}

static int smc911x_ethtool_geteeprom(struct net_device *dev,
                                      struct ethtool_eeprom *eeprom, u8 *data)
{
    u8 eebuf[SMC911X_EEPROM_LEN];
    int i, ret;

    for(i=0;i<SMC911X_EEPROM_LEN;i++) {
        if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_READ_, i ))!=0)
            return ret;
        if ((ret=smc911x_ethtool_read_eeprom_byte(dev, &eebuf[i]))!=0)
            return ret;
        }
    memcpy(data, eebuf+eeprom->offset, eeprom->len);
    return 0;
}

static int smc911x_ethtool_seteeprom(struct net_device *dev,
                                       struct ethtool_eeprom *eeprom, u8 *data)
{
    int i, ret;

    /* Enable erase */
    if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_EWEN_, 0 ))!=0)
        return ret;
    for(i=eeprom->offset;i<(eeprom->offset+eeprom->len);i++) {
        /* erase byte */
        if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_ERASE_, i ))!=0)
            return ret;
        /* write byte */
        if ((ret=smc911x_ethtool_write_eeprom_byte(dev, *data))!=0)
             return ret;
        if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_WRITE_, i ))!=0)
            return ret;
        }
     return 0;
}

static int smc911x_ethtool_geteeprom_len(struct net_device *dev)
{
     return SMC911X_EEPROM_LEN;
}

static const struct ethtool_ops smc911x_ethtool_ops = {
    .get_settings    = smc911x_ethtool_getsettings,
    .set_settings    = smc911x_ethtool_setsettings,
    .get_drvinfo     = smc911x_ethtool_getdrvinfo,
    .get_msglevel    = smc911x_ethtool_getmsglevel,
    .set_msglevel    = smc911x_ethtool_setmsglevel,
    .nway_reset = smc911x_ethtool_nwayreset,
    .get_link    = ethtool_op_get_link,
    .get_regs_len    = smc911x_ethtool_getregslen,
    .get_regs    = smc911x_ethtool_getregs,
    .get_eeprom_len = smc911x_ethtool_geteeprom_len,
    .get_eeprom = smc911x_ethtool_geteeprom,
    .set_eeprom = smc911x_ethtool_seteeprom,
};

/*
 * smc911x_findirq
 *
 * This routine has a simple purpose -- make the SMC chip generate an
 * interrupt, so an auto-detect routine can detect it, and find the IRQ,
 */
static int __devinit smc911x_findirq(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int timeout = 20;
    unsigned long cookie;

    DBG(SMC_DEBUG_FUNC, "--> %s\n", __func__);

    cookie = probe_irq_on();

    /*
     * Force a SW interrupt
     */

    SMC_SET_INT_EN(lp, INT_EN_SW_INT_EN_);

    /*
     * Wait until positive that the interrupt has been generated
     */
    do {
        int int_status;
        udelay(10);
        int_status = SMC_GET_INT_EN(lp);
        if (int_status & INT_EN_SW_INT_EN_)
             break;     /* got the interrupt */
    } while (--timeout);

    /*
     * there is really nothing that I can do here if timeout fails,
     * as autoirq_report will return a 0 anyway, which is what I
     * want in this case.    Plus, the clean up is needed in both
     * cases.
     */

    /* and disable all interrupts again */
    SMC_SET_INT_EN(lp, 0);

    /* and return what I found */
    return probe_irq_off(cookie);
}

static const struct net_device_ops smc911x_netdev_ops = {
    .ndo_open       = smc911x_open,
    .ndo_stop       = smc911x_close,
    .ndo_start_xmit     = smc911x_hard_start_xmit,
    .ndo_tx_timeout     = smc911x_timeout,
    .ndo_set_rx_mode    = smc911x_set_multicast_list,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_mac_address    = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
    .ndo_poll_controller    = smc911x_poll_controller,
#endif
};

/*
 * Function: smc911x_probe(unsigned long ioaddr)
 *
 * Purpose:
 *   Tests to see if a given ioaddr points to an SMC911x chip.
 *   Returns a 0 on success
 *
 * Algorithm:
 *   (1) see if the endian word is OK
 *   (1) see if I recognize the chip ID in the appropriate register
 *
 * Here I do typical initialization tasks.
 *
 * o  Initialize the structure if needed
 * o  print out my vanity message if not done so already
 * o  print out what type of hardware is detected
 * o  print out the ethernet address
 * o  find the IRQ
 * o  set up my private data
 * o  configure the dev structure with my subroutines
 * o  actually GRAB the irq.
 * o  GRAB the region
 */
static int __devinit smc911x_probe(struct net_device *dev)
{
    struct smc911x_local *lp = netdev_priv(dev);
    int i, retval;
    unsigned int val, chip_id, revision;
    const char *version_string;
    unsigned long irq_flags;

    DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);

    /* First, see if the endian word is recognized */
    val = SMC_GET_BYTE_TEST(lp);
    DBG(SMC_DEBUG_MISC, "%s: endian probe returned 0x%04x\n", CARDNAME, val);
    if (val != 0x87654321) {
        printk(KERN_ERR "Invalid chip endian 0x%08x\n",val);
        retval = -ENODEV;
        goto err_out;
    }

    /*
     * check if the revision register is something that I
     * recognize.   These might need to be added to later,
     * as future revisions could be added.
     */
    chip_id = SMC_GET_PN(lp);
    DBG(SMC_DEBUG_MISC, "%s: id probe returned 0x%04x\n", CARDNAME, chip_id);
    for(i=0;chip_ids[i].id != 0; i++) {
        if (chip_ids[i].id == chip_id) break;
    }
    if (!chip_ids[i].id) {
        printk(KERN_ERR "Unknown chip ID %04x\n", chip_id);
        retval = -ENODEV;
        goto err_out;
    }
    version_string = chip_ids[i].name;

    revision = SMC_GET_REV(lp);
    DBG(SMC_DEBUG_MISC, "%s: revision = 0x%04x\n", CARDNAME, revision);

    /* At this point I'll assume that the chip is an SMC911x. */
    DBG(SMC_DEBUG_MISC, "%s: Found a %s\n", CARDNAME, chip_ids[i].name);

    /* Validate the TX FIFO size requested */
    if ((tx_fifo_kb < 2) || (tx_fifo_kb > 14)) {
        printk(KERN_ERR "Invalid TX FIFO size requested %d\n", tx_fifo_kb);
        retval = -EINVAL;
        goto err_out;
    }

    /* fill in some of the fields */
    lp->version = chip_ids[i].id;
    lp->revision = revision;
    lp->tx_fifo_kb = tx_fifo_kb;
    /* Reverse calculate the RX FIFO size from the TX */
    lp->tx_fifo_size=(lp->tx_fifo_kb<<10) - 512;
    lp->rx_fifo_size= ((0x4000 - 512 - lp->tx_fifo_size) / 16) * 15;

    /* Set the automatic flow control values */
    switch(lp->tx_fifo_kb) {
        /*
         *   AFC_HI is about ((Rx Data Fifo Size)*2/3)/64
         *   AFC_LO is AFC_HI/2
         *   BACK_DUR is about 5uS*(AFC_LO) rounded down
         */
        case 2:/* 13440 Rx Data Fifo Size */
            lp->afc_cfg=0x008C46AF;break;
        case 3:/* 12480 Rx Data Fifo Size */
            lp->afc_cfg=0x0082419F;break;
        case 4:/* 11520 Rx Data Fifo Size */
            lp->afc_cfg=0x00783C9F;break;
        case 5:/* 10560 Rx Data Fifo Size */
            lp->afc_cfg=0x006E374F;break;
        case 6:/* 9600 Rx Data Fifo Size */
            lp->afc_cfg=0x0064328F;break;
        case 7:/* 8640 Rx Data Fifo Size */
            lp->afc_cfg=0x005A2D7F;break;
        case 8:/* 7680 Rx Data Fifo Size */
            lp->afc_cfg=0x0050287F;break;
        case 9:/* 6720 Rx Data Fifo Size */
            lp->afc_cfg=0x0046236F;break;
        case 10:/* 5760 Rx Data Fifo Size */
            lp->afc_cfg=0x003C1E6F;break;
        case 11:/* 4800 Rx Data Fifo Size */
            lp->afc_cfg=0x0032195F;break;
        /*
         *   AFC_HI is ~1520 bytes less than RX Data Fifo Size
         *   AFC_LO is AFC_HI/2
         *   BACK_DUR is about 5uS*(AFC_LO) rounded down
         */
        case 12:/* 3840 Rx Data Fifo Size */
            lp->afc_cfg=0x0024124F;break;
        case 13:/* 2880 Rx Data Fifo Size */
            lp->afc_cfg=0x0015073F;break;
        case 14:/* 1920 Rx Data Fifo Size */
            lp->afc_cfg=0x0006032F;break;
         default:
             PRINTK("%s: ERROR -- no AFC_CFG setting found",
                dev->name);
             break;
    }

    DBG(SMC_DEBUG_MISC | SMC_DEBUG_TX | SMC_DEBUG_RX,
        "%s: tx_fifo %d rx_fifo %d afc_cfg 0x%08x\n", CARDNAME,
        lp->tx_fifo_size, lp->rx_fifo_size, lp->afc_cfg);

    spin_lock_init(&lp->lock);

    /* Get the MAC address */
    SMC_GET_MAC_ADDR(lp, dev->dev_addr);

    /* now, reset the chip, and put it into a known state */
    smc911x_reset(dev);

    /*
     * If dev->irq is 0, then the device has to be banged on to see
     * what the IRQ is.
     *
     * Specifying an IRQ is done with the assumption that the user knows
     * what (s)he is doing.  No checking is done!!!!
     */
    if (dev->irq < 1) {
        int trials;

        trials = 3;
        while (trials--) {
            dev->irq = smc911x_findirq(dev);
            if (dev->irq)
                break;
            /* kick the card and try again */
            smc911x_reset(dev);
        }
    }
    if (dev->irq == 0) {
        printk("%s: Couldn't autodetect your IRQ. Use irq=xx.\n",
            dev->name);
        retval = -ENODEV;
        goto err_out;
    }
    dev->irq = irq_canonicalize(dev->irq);

    /* Fill in the fields of the device structure with ethernet values. */
    ether_setup(dev);

    dev->netdev_ops = &smc911x_netdev_ops;
    dev->watchdog_timeo = msecs_to_jiffies(watchdog);
    dev->ethtool_ops = &smc911x_ethtool_ops;

    INIT_WORK(&lp->phy_configure, smc911x_phy_configure);
    lp->mii.phy_id_mask = 0x1f;
    lp->mii.reg_num_mask = 0x1f;
    lp->mii.force_media = 0;
    lp->mii.full_duplex = 0;
    lp->mii.dev = dev;
    lp->mii.mdio_read = smc911x_phy_read;
    lp->mii.mdio_write = smc911x_phy_write;

    /*
     * Locate the phy, if any.
     */
    smc911x_phy_detect(dev);

    /* Set default parameters */
    lp->msg_enable = NETIF_MSG_LINK;
    lp->ctl_rfduplx = 1;
    lp->ctl_rspeed = 100;

#ifdef SMC_DYNAMIC_BUS_CONFIG
    irq_flags = lp->cfg.irq_flags;
#else
    irq_flags = IRQF_SHARED | SMC_IRQ_SENSE;
#endif

    /* Grab the IRQ */
    retval = request_irq(dev->irq, smc911x_interrupt,
                 irq_flags, dev->name, dev);
    if (retval)
        goto err_out;

#ifdef SMC_USE_DMA
    lp->rxdma = SMC_DMA_REQUEST(dev, smc911x_rx_dma_irq);
    lp->txdma = SMC_DMA_REQUEST(dev, smc911x_tx_dma_irq);
    lp->rxdma_active = 0;
    lp->txdma_active = 0;
    dev->dma = lp->rxdma;
#endif

    retval = register_netdev(dev);
    if (retval == 0) {
        /* now, print out the card info, in a short format.. */
        printk("%s: %s (rev %d) at %#lx IRQ %d",
            dev->name, version_string, lp->revision,
            dev->base_addr, dev->irq);

#ifdef SMC_USE_DMA
        if (lp->rxdma != -1)
            printk(" RXDMA %d ", lp->rxdma);

        if (lp->txdma != -1)
            printk("TXDMA %d", lp->txdma);
#endif
        printk("\n");
        if (!is_valid_ether_addr(dev->dev_addr)) {
            printk("%s: Invalid ethernet MAC address. Please "
                    "set using ifconfig\n", dev->name);
        } else {
            /* Print the Ethernet address */
            printk("%s: Ethernet addr: %pM\n",
                dev->name, dev->dev_addr);
        }

        if (lp->phy_type == 0) {
            PRINTK("%s: No PHY found\n", dev->name);
        } else if ((lp->phy_type & ~0xff) == LAN911X_INTERNAL_PHY_ID) {
            PRINTK("%s: LAN911x Internal PHY\n", dev->name);
        } else {
            PRINTK("%s: External PHY 0x%08x\n", dev->name, lp->phy_type);
        }
    }

err_out:
#ifdef SMC_USE_DMA
    if (retval) {
        if (lp->rxdma != -1) {
            SMC_DMA_FREE(dev, lp->rxdma);
        }
        if (lp->txdma != -1) {
            SMC_DMA_FREE(dev, lp->txdma);
        }
    }
#endif
    return retval;
}

/*
 * smc911x_init(void)
 *
 *    Output:
 *   0 --> there is a device
 *   anything else, error
 */
static int __devinit smc911x_drv_probe(struct platform_device *pdev)
{
    struct net_device *ndev;
    struct resource *res;
    struct smc911x_local *lp;
    unsigned int *addr;
    int ret;

    DBG(SMC_DEBUG_FUNC, "--> %s\n",  __func__);
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        ret = -ENODEV;
        goto out;
    }

    /*
     * Request the regions.
     */
    if (!request_mem_region(res->start, SMC911X_IO_EXTENT, CARDNAME)) {
         ret = -EBUSY;
         goto out;
    }

    ndev = alloc_etherdev(sizeof(struct smc911x_local));
    if (!ndev) {
        ret = -ENOMEM;
        goto release_1;
    }
    SET_NETDEV_DEV(ndev, &pdev->dev);

    ndev->dma = (unsigned char)-1;
    ndev->irq = platform_get_irq(pdev, 0);
    lp = netdev_priv(ndev);
    lp->netdev = ndev;
#ifdef SMC_DYNAMIC_BUS_CONFIG
    {
        struct smc911x_platdata *pd = pdev->dev.platform_data;
        if (!pd) {
            ret = -EINVAL;
            goto release_both;
        }
        memcpy(&lp->cfg, pd, sizeof(lp->cfg));
    }
#endif

    addr = ioremap(res->start, SMC911X_IO_EXTENT);
    if (!addr) {
        ret = -ENOMEM;
        goto release_both;
    }

    platform_set_drvdata(pdev, ndev);
    lp->base = addr;
    ndev->base_addr = res->start;
    ret = smc911x_probe(ndev);
    if (ret != 0) {
        platform_set_drvdata(pdev, NULL);
        iounmap(addr);
release_both:
        free_netdev(ndev);
release_1:
        release_mem_region(res->start, SMC911X_IO_EXTENT);
out:
        printk("%s: not found (%d).\n", CARDNAME, ret);
    }
#ifdef SMC_USE_DMA
    else {
        lp->physaddr = res->start;
        lp->dev = &pdev->dev;
    }
#endif

    return ret;
}

static int __devexit smc911x_drv_remove(struct platform_device *pdev)
{
    struct net_device *ndev = platform_get_drvdata(pdev);
    struct smc911x_local *lp = netdev_priv(ndev);
    struct resource *res;

    DBG(SMC_DEBUG_FUNC, "--> %s\n", __func__);
    platform_set_drvdata(pdev, NULL);

    unregister_netdev(ndev);

    free_irq(ndev->irq, ndev);

#ifdef SMC_USE_DMA
    {
        if (lp->rxdma != -1) {
            SMC_DMA_FREE(dev, lp->rxdma);
        }
        if (lp->txdma != -1) {
            SMC_DMA_FREE(dev, lp->txdma);
        }
    }
#endif
    iounmap(lp->base);
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    release_mem_region(res->start, SMC911X_IO_EXTENT);

    free_netdev(ndev);
    return 0;
}

static int smc911x_drv_suspend(struct platform_device *dev, pm_message_t state)
{
    struct net_device *ndev = platform_get_drvdata(dev);
    struct smc911x_local *lp = netdev_priv(ndev);

    DBG(SMC_DEBUG_FUNC, "--> %s\n", __func__);
    if (ndev) {
        if (netif_running(ndev)) {
            netif_device_detach(ndev);
            smc911x_shutdown(ndev);
#if POWER_DOWN
            /* Set D2 - Energy detect only setting */
            SMC_SET_PMT_CTRL(lp, 2<<12);
#endif
        }
    }
    return 0;
}

static int smc911x_drv_resume(struct platform_device *dev)
{
    struct net_device *ndev = platform_get_drvdata(dev);

    DBG(SMC_DEBUG_FUNC, "--> %s\n", __func__);
    if (ndev) {
        struct smc911x_local *lp = netdev_priv(ndev);

        if (netif_running(ndev)) {
            smc911x_reset(ndev);
            if (lp->phy_type != 0)
                smc911x_phy_configure(&lp->phy_configure);
            smc911x_enable(ndev);
            netif_device_attach(ndev);
        }
    }
    return 0;
}

static struct platform_driver smc911x_driver = {
    .probe       = smc911x_drv_probe,
    .remove  = __devexit_p(smc911x_drv_remove),
    .suspend     = smc911x_drv_suspend,
    .resume  = smc911x_drv_resume,
    .driver  = {
        .name    = CARDNAME,
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(smc911x_driver);