tsi108_eth.c

Go to the documentation of this file.

/*******************************************************************************

  Copyright(c) 2006 Tundra Semiconductor Corporation.

  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.

*******************************************************************************/

/* This driver is based on the driver code originally developed
 * for the Intel IOC80314 (ForestLake) Gigabit Ethernet by
 * [email protected]  * Copyright (C) 2003 TimeSys Corporation
 *
 * Currently changes from original version are:
 * - porting to Tsi108-based platform and kernel 2.6 ([email protected])
 * - modifications to handle two ports independently and support for
 *   additional PHY devices ([email protected])
 * - Get hardware information from platform device. ([email protected])
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/rtnetlink.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/gfp.h>

#include <asm/io.h>
#include <asm/tsi108.h>

#include "tsi108_eth.h"

#define MII_READ_DELAY 10000    /* max link wait time in msec */

#define TSI108_RXRING_LEN     256

/* NOTE: The driver currently does not support receiving packets
 * larger than the buffer size, so don't decrease this (unless you
 * want to add such support).
 */
#define TSI108_RXBUF_SIZE     1536

#define TSI108_TXRING_LEN     256

#define TSI108_TX_INT_FREQ    64

/* Check the phy status every half a second. */
#define CHECK_PHY_INTERVAL (HZ/2)

static int tsi108_init_one(struct platform_device *pdev);
static int tsi108_ether_remove(struct platform_device *pdev);

struct tsi108_prv_data {
    void  __iomem *regs;    /* Base of normal regs */
    void  __iomem *phyregs; /* Base of register bank used for PHY access */

    struct net_device *dev;
    struct napi_struct napi;

    unsigned int phy;       /* Index of PHY for this interface */
    unsigned int irq_num;
    unsigned int id;
    unsigned int phy_type;

    struct timer_list timer;/* Timer that triggers the check phy function */
    unsigned int rxtail;    /* Next entry in rxring to read */
    unsigned int rxhead;    /* Next entry in rxring to give a new buffer */
    unsigned int rxfree;    /* Number of free, allocated RX buffers */

    unsigned int rxpending; /* Non-zero if there are still descriptors
                 * to be processed from a previous descriptor
                 * interrupt condition that has been cleared */

    unsigned int txtail;    /* Next TX descriptor to check status on */
    unsigned int txhead;    /* Next TX descriptor to use */

    /* Number of free TX descriptors.  This could be calculated from
     * rxhead and rxtail if one descriptor were left unused to disambiguate
     * full and empty conditions, but it's simpler to just keep track
     * explicitly. */

    unsigned int txfree;

    unsigned int phy_ok;        /* The PHY is currently powered on. */

    /* PHY status (duplex is 1 for half, 2 for full,
     * so that the default 0 indicates that neither has
     * yet been configured). */

    unsigned int link_up;
    unsigned int speed;
    unsigned int duplex;

    tx_desc *txring;
    rx_desc *rxring;
    struct sk_buff *txskbs[TSI108_TXRING_LEN];
    struct sk_buff *rxskbs[TSI108_RXRING_LEN];

    dma_addr_t txdma, rxdma;

    /* txlock nests in misclock and phy_lock */

    spinlock_t txlock, misclock;

    /* stats is used to hold the upper bits of each hardware counter,
     * and tmpstats is used to hold the full values for returning
     * to the caller of get_stats().  They must be separate in case
     * an overflow interrupt occurs before the stats are consumed.
     */

    struct net_device_stats stats;
    struct net_device_stats tmpstats;

    /* These stats are kept separate in hardware, thus require individual
     * fields for handling carry.  They are combined in get_stats.
     */

    unsigned long rx_fcs;   /* Add to rx_frame_errors */
    unsigned long rx_short_fcs; /* Add to rx_frame_errors */
    unsigned long rx_long_fcs;  /* Add to rx_frame_errors */
    unsigned long rx_underruns; /* Add to rx_length_errors */
    unsigned long rx_overruns;  /* Add to rx_length_errors */

    unsigned long tx_coll_abort;    /* Add to tx_aborted_errors/collisions */
    unsigned long tx_pause_drop;    /* Add to tx_aborted_errors */

    unsigned long mc_hash[16];
    u32 msg_enable;         /* debug message level */
    struct mii_if_info mii_if;
    unsigned int init_media;
};

/* Structure for a device driver */

static struct platform_driver tsi_eth_driver = {
    .probe = tsi108_init_one,
    .remove = tsi108_ether_remove,
    .driver = {
        .name = "tsi-ethernet",
        .owner = THIS_MODULE,
    },
};

static void tsi108_timed_checker(unsigned long dev_ptr);

static void dump_eth_one(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);

    printk("Dumping %s...\n", dev->name);
    printk("intstat %x intmask %x phy_ok %d"
           " link %d speed %d duplex %d\n",
           TSI_READ(TSI108_EC_INTSTAT),
           TSI_READ(TSI108_EC_INTMASK), data->phy_ok,
           data->link_up, data->speed, data->duplex);

    printk("TX: head %d, tail %d, free %d, stat %x, estat %x, err %x\n",
           data->txhead, data->txtail, data->txfree,
           TSI_READ(TSI108_EC_TXSTAT),
           TSI_READ(TSI108_EC_TXESTAT),
           TSI_READ(TSI108_EC_TXERR));

    printk("RX: head %d, tail %d, free %d, stat %x,"
           " estat %x, err %x, pending %d\n\n",
           data->rxhead, data->rxtail, data->rxfree,
           TSI_READ(TSI108_EC_RXSTAT),
           TSI_READ(TSI108_EC_RXESTAT),
           TSI_READ(TSI108_EC_RXERR), data->rxpending);
}

/* Synchronization is needed between the thread and up/down events.
 * Note that the PHY is accessed through the same registers for both
 * interfaces, so this can't be made interface-specific.
 */

static DEFINE_SPINLOCK(phy_lock);

static int tsi108_read_mii(struct tsi108_prv_data *data, int reg)
{
    unsigned i;

    TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
                (data->phy << TSI108_MAC_MII_ADDR_PHY) |
                (reg << TSI108_MAC_MII_ADDR_REG));
    TSI_WRITE_PHY(TSI108_MAC_MII_CMD, 0);
    TSI_WRITE_PHY(TSI108_MAC_MII_CMD, TSI108_MAC_MII_CMD_READ);
    for (i = 0; i < 100; i++) {
        if (!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
              (TSI108_MAC_MII_IND_NOTVALID | TSI108_MAC_MII_IND_BUSY)))
            break;
        udelay(10);
    }

    if (i == 100)
        return 0xffff;
    else
        return TSI_READ_PHY(TSI108_MAC_MII_DATAIN);
}

static void tsi108_write_mii(struct tsi108_prv_data *data,
                int reg, u16 val)
{
    unsigned i = 100;
    TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
                (data->phy << TSI108_MAC_MII_ADDR_PHY) |
                (reg << TSI108_MAC_MII_ADDR_REG));
    TSI_WRITE_PHY(TSI108_MAC_MII_DATAOUT, val);
    while (i--) {
        if(!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
            TSI108_MAC_MII_IND_BUSY))
            break;
        udelay(10);
    }
}

static int tsi108_mdio_read(struct net_device *dev, int addr, int reg)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    return tsi108_read_mii(data, reg);
}

static void tsi108_mdio_write(struct net_device *dev, int addr, int reg, int val)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    tsi108_write_mii(data, reg, val);
}

static inline void tsi108_write_tbi(struct tsi108_prv_data *data,
                    int reg, u16 val)
{
    unsigned i = 1000;
    TSI_WRITE(TSI108_MAC_MII_ADDR,
                 (0x1e << TSI108_MAC_MII_ADDR_PHY)
                 | (reg << TSI108_MAC_MII_ADDR_REG));
    TSI_WRITE(TSI108_MAC_MII_DATAOUT, val);
    while(i--) {
        if(!(TSI_READ(TSI108_MAC_MII_IND) & TSI108_MAC_MII_IND_BUSY))
            return;
        udelay(10);
    }
    printk(KERN_ERR "%s function time out\n", __func__);
}

static int mii_speed(struct mii_if_info *mii)
{
    int advert, lpa, val, media;
    int lpa2 = 0;
    int speed;

    if (!mii_link_ok(mii))
        return 0;

    val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
    if ((val & BMSR_ANEGCOMPLETE) == 0)
        return 0;

    advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
    lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
    media = mii_nway_result(advert & lpa);

    if (mii->supports_gmii)
        lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000);

    speed = lpa2 & (LPA_1000FULL | LPA_1000HALF) ? 1000 :
            (media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? 100 : 10);
    return speed;
}

static void tsi108_check_phy(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 mac_cfg2_reg, portctrl_reg;
    u32 duplex;
    u32 speed;
    unsigned long flags;

    spin_lock_irqsave(&phy_lock, flags);

    if (!data->phy_ok)
        goto out;

    duplex = mii_check_media(&data->mii_if, netif_msg_link(data), data->init_media);
    data->init_media = 0;

    if (netif_carrier_ok(dev)) {

        speed = mii_speed(&data->mii_if);

        if ((speed != data->speed) || duplex) {

            mac_cfg2_reg = TSI_READ(TSI108_MAC_CFG2);
            portctrl_reg = TSI_READ(TSI108_EC_PORTCTRL);

            mac_cfg2_reg &= ~TSI108_MAC_CFG2_IFACE_MASK;

            if (speed == 1000) {
                mac_cfg2_reg |= TSI108_MAC_CFG2_GIG;
                portctrl_reg &= ~TSI108_EC_PORTCTRL_NOGIG;
            } else {
                mac_cfg2_reg |= TSI108_MAC_CFG2_NOGIG;
                portctrl_reg |= TSI108_EC_PORTCTRL_NOGIG;
            }

            data->speed = speed;

            if (data->mii_if.full_duplex) {
                mac_cfg2_reg |= TSI108_MAC_CFG2_FULLDUPLEX;
                portctrl_reg &= ~TSI108_EC_PORTCTRL_HALFDUPLEX;
                data->duplex = 2;
            } else {
                mac_cfg2_reg &= ~TSI108_MAC_CFG2_FULLDUPLEX;
                portctrl_reg |= TSI108_EC_PORTCTRL_HALFDUPLEX;
                data->duplex = 1;
            }

            TSI_WRITE(TSI108_MAC_CFG2, mac_cfg2_reg);
            TSI_WRITE(TSI108_EC_PORTCTRL, portctrl_reg);
        }

        if (data->link_up == 0) {
            /* The manual says it can take 3-4 usecs for the speed change
             * to take effect.
             */
            udelay(5);

            spin_lock(&data->txlock);
            if (is_valid_ether_addr(dev->dev_addr) && data->txfree)
                netif_wake_queue(dev);

            data->link_up = 1;
            spin_unlock(&data->txlock);
        }
    } else {
        if (data->link_up == 1) {
            netif_stop_queue(dev);
            data->link_up = 0;
            printk(KERN_NOTICE "%s : link is down\n", dev->name);
        }

        goto out;
    }


out:
    spin_unlock_irqrestore(&phy_lock, flags);
}

static inline void
tsi108_stat_carry_one(int carry, int carry_bit, int carry_shift,
              unsigned long *upper)
{
    if (carry & carry_bit)
        *upper += carry_shift;
}

static void tsi108_stat_carry(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 carry1, carry2;

    spin_lock_irq(&data->misclock);

    carry1 = TSI_READ(TSI108_STAT_CARRY1);
    carry2 = TSI_READ(TSI108_STAT_CARRY2);

    TSI_WRITE(TSI108_STAT_CARRY1, carry1);
    TSI_WRITE(TSI108_STAT_CARRY2, carry2);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXBYTES,
                  TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXPKTS,
                  TSI108_STAT_RXPKTS_CARRY,
                  &data->stats.rx_packets);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFCS,
                  TSI108_STAT_RXFCS_CARRY, &data->rx_fcs);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXMCAST,
                  TSI108_STAT_RXMCAST_CARRY,
                  &data->stats.multicast);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXALIGN,
                  TSI108_STAT_RXALIGN_CARRY,
                  &data->stats.rx_frame_errors);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXLENGTH,
                  TSI108_STAT_RXLENGTH_CARRY,
                  &data->stats.rx_length_errors);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXRUNT,
                  TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJUMBO,
                  TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFRAG,
                  TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJABBER,
                  TSI108_STAT_RXJABBER_CARRY, &data->rx_long_fcs);

    tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXDROP,
                  TSI108_STAT_RXDROP_CARRY,
                  &data->stats.rx_missed_errors);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXBYTES,
                  TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPKTS,
                  TSI108_STAT_TXPKTS_CARRY,
                  &data->stats.tx_packets);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXDEF,
                  TSI108_STAT_TXEXDEF_CARRY,
                  &data->stats.tx_aborted_errors);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXCOL,
                  TSI108_STAT_TXEXCOL_CARRY, &data->tx_coll_abort);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXTCOL,
                  TSI108_STAT_TXTCOL_CARRY,
                  &data->stats.collisions);

    tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPAUSE,
                  TSI108_STAT_TXPAUSEDROP_CARRY,
                  &data->tx_pause_drop);

    spin_unlock_irq(&data->misclock);
}

/* Read a stat counter atomically with respect to carries.
 * data->misclock must be held.
 */
static inline unsigned long
tsi108_read_stat(struct tsi108_prv_data * data, int reg, int carry_bit,
         int carry_shift, unsigned long *upper)
{
    int carryreg;
    unsigned long val;

    if (reg < 0xb0)
        carryreg = TSI108_STAT_CARRY1;
    else
        carryreg = TSI108_STAT_CARRY2;

      again:
    val = TSI_READ(reg) | *upper;

    /* Check to see if it overflowed, but the interrupt hasn't
     * been serviced yet.  If so, handle the carry here, and
     * try again.
     */

    if (unlikely(TSI_READ(carryreg) & carry_bit)) {
        *upper += carry_shift;
        TSI_WRITE(carryreg, carry_bit);
        goto again;
    }

    return val;
}

static struct net_device_stats *tsi108_get_stats(struct net_device *dev)
{
    unsigned long excol;

    struct tsi108_prv_data *data = netdev_priv(dev);
    spin_lock_irq(&data->misclock);

    data->tmpstats.rx_packets =
        tsi108_read_stat(data, TSI108_STAT_RXPKTS,
                 TSI108_STAT_CARRY1_RXPKTS,
                 TSI108_STAT_RXPKTS_CARRY, &data->stats.rx_packets);

    data->tmpstats.tx_packets =
        tsi108_read_stat(data, TSI108_STAT_TXPKTS,
                 TSI108_STAT_CARRY2_TXPKTS,
                 TSI108_STAT_TXPKTS_CARRY, &data->stats.tx_packets);

    data->tmpstats.rx_bytes =
        tsi108_read_stat(data, TSI108_STAT_RXBYTES,
                 TSI108_STAT_CARRY1_RXBYTES,
                 TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);

    data->tmpstats.tx_bytes =
        tsi108_read_stat(data, TSI108_STAT_TXBYTES,
                 TSI108_STAT_CARRY2_TXBYTES,
                 TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);

    data->tmpstats.multicast =
        tsi108_read_stat(data, TSI108_STAT_RXMCAST,
                 TSI108_STAT_CARRY1_RXMCAST,
                 TSI108_STAT_RXMCAST_CARRY, &data->stats.multicast);

    excol = tsi108_read_stat(data, TSI108_STAT_TXEXCOL,
                 TSI108_STAT_CARRY2_TXEXCOL,
                 TSI108_STAT_TXEXCOL_CARRY,
                 &data->tx_coll_abort);

    data->tmpstats.collisions =
        tsi108_read_stat(data, TSI108_STAT_TXTCOL,
                 TSI108_STAT_CARRY2_TXTCOL,
                 TSI108_STAT_TXTCOL_CARRY, &data->stats.collisions);

    data->tmpstats.collisions += excol;

    data->tmpstats.rx_length_errors =
        tsi108_read_stat(data, TSI108_STAT_RXLENGTH,
                 TSI108_STAT_CARRY1_RXLENGTH,
                 TSI108_STAT_RXLENGTH_CARRY,
                 &data->stats.rx_length_errors);

    data->tmpstats.rx_length_errors +=
        tsi108_read_stat(data, TSI108_STAT_RXRUNT,
                 TSI108_STAT_CARRY1_RXRUNT,
                 TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);

    data->tmpstats.rx_length_errors +=
        tsi108_read_stat(data, TSI108_STAT_RXJUMBO,
                 TSI108_STAT_CARRY1_RXJUMBO,
                 TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);

    data->tmpstats.rx_frame_errors =
        tsi108_read_stat(data, TSI108_STAT_RXALIGN,
                 TSI108_STAT_CARRY1_RXALIGN,
                 TSI108_STAT_RXALIGN_CARRY,
                 &data->stats.rx_frame_errors);

    data->tmpstats.rx_frame_errors +=
        tsi108_read_stat(data, TSI108_STAT_RXFCS,
                 TSI108_STAT_CARRY1_RXFCS, TSI108_STAT_RXFCS_CARRY,
                 &data->rx_fcs);

    data->tmpstats.rx_frame_errors +=
        tsi108_read_stat(data, TSI108_STAT_RXFRAG,
                 TSI108_STAT_CARRY1_RXFRAG,
                 TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);

    data->tmpstats.rx_missed_errors =
        tsi108_read_stat(data, TSI108_STAT_RXDROP,
                 TSI108_STAT_CARRY1_RXDROP,
                 TSI108_STAT_RXDROP_CARRY,
                 &data->stats.rx_missed_errors);

    /* These three are maintained by software. */
    data->tmpstats.rx_fifo_errors = data->stats.rx_fifo_errors;
    data->tmpstats.rx_crc_errors = data->stats.rx_crc_errors;

    data->tmpstats.tx_aborted_errors =
        tsi108_read_stat(data, TSI108_STAT_TXEXDEF,
                 TSI108_STAT_CARRY2_TXEXDEF,
                 TSI108_STAT_TXEXDEF_CARRY,
                 &data->stats.tx_aborted_errors);

    data->tmpstats.tx_aborted_errors +=
        tsi108_read_stat(data, TSI108_STAT_TXPAUSEDROP,
                 TSI108_STAT_CARRY2_TXPAUSE,
                 TSI108_STAT_TXPAUSEDROP_CARRY,
                 &data->tx_pause_drop);

    data->tmpstats.tx_aborted_errors += excol;

    data->tmpstats.tx_errors = data->tmpstats.tx_aborted_errors;
    data->tmpstats.rx_errors = data->tmpstats.rx_length_errors +
        data->tmpstats.rx_crc_errors +
        data->tmpstats.rx_frame_errors +
        data->tmpstats.rx_fifo_errors + data->tmpstats.rx_missed_errors;

    spin_unlock_irq(&data->misclock);
    return &data->tmpstats;
}

static void tsi108_restart_rx(struct tsi108_prv_data * data, struct net_device *dev)
{
    TSI_WRITE(TSI108_EC_RXQ_PTRHIGH,
                 TSI108_EC_RXQ_PTRHIGH_VALID);

    TSI_WRITE(TSI108_EC_RXCTRL, TSI108_EC_RXCTRL_GO
                 | TSI108_EC_RXCTRL_QUEUE0);
}

static void tsi108_restart_tx(struct tsi108_prv_data * data)
{
    TSI_WRITE(TSI108_EC_TXQ_PTRHIGH,
                 TSI108_EC_TXQ_PTRHIGH_VALID);

    TSI_WRITE(TSI108_EC_TXCTRL, TSI108_EC_TXCTRL_IDLEINT |
                 TSI108_EC_TXCTRL_GO | TSI108_EC_TXCTRL_QUEUE0);
}

/* txlock must be held by caller, with IRQs disabled, and
 * with permission to re-enable them when the lock is dropped.
 */
static void tsi108_complete_tx(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    int tx;
    struct sk_buff *skb;
    int release = 0;

    while (!data->txfree || data->txhead != data->txtail) {
        tx = data->txtail;

        if (data->txring[tx].misc & TSI108_TX_OWN)
            break;

        skb = data->txskbs[tx];

        if (!(data->txring[tx].misc & TSI108_TX_OK))
            printk("%s: bad tx packet, misc %x\n",
                   dev->name, data->txring[tx].misc);

        data->txtail = (data->txtail + 1) % TSI108_TXRING_LEN;
        data->txfree++;

        if (data->txring[tx].misc & TSI108_TX_EOF) {
            dev_kfree_skb_any(skb);
            release++;
        }
    }

    if (release) {
        if (is_valid_ether_addr(dev->dev_addr) && data->link_up)
            netif_wake_queue(dev);
    }
}

static int tsi108_send_packet(struct sk_buff * skb, struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    int frags = skb_shinfo(skb)->nr_frags + 1;
    int i;

    if (!data->phy_ok && net_ratelimit())
        printk(KERN_ERR "%s: Transmit while PHY is down!\n", dev->name);

    if (!data->link_up) {
        printk(KERN_ERR "%s: Transmit while link is down!\n",
               dev->name);
        netif_stop_queue(dev);
        return NETDEV_TX_BUSY;
    }

    if (data->txfree < MAX_SKB_FRAGS + 1) {
        netif_stop_queue(dev);

        if (net_ratelimit())
            printk(KERN_ERR "%s: Transmit with full tx ring!\n",
                   dev->name);
        return NETDEV_TX_BUSY;
    }

    if (data->txfree - frags < MAX_SKB_FRAGS + 1) {
        netif_stop_queue(dev);
    }

    spin_lock_irq(&data->txlock);

    for (i = 0; i < frags; i++) {
        int misc = 0;
        int tx = data->txhead;

        /* This is done to mark every TSI108_TX_INT_FREQ tx buffers with
         * the interrupt bit.  TX descriptor-complete interrupts are
         * enabled when the queue fills up, and masked when there is
         * still free space.  This way, when saturating the outbound
         * link, the tx interrupts are kept to a reasonable level.
         * When the queue is not full, reclamation of skbs still occurs
         * as new packets are transmitted, or on a queue-empty
         * interrupt.
         */

        if ((tx % TSI108_TX_INT_FREQ == 0) &&
            ((TSI108_TXRING_LEN - data->txfree) >= TSI108_TX_INT_FREQ))
            misc = TSI108_TX_INT;

        data->txskbs[tx] = skb;

        if (i == 0) {
            data->txring[tx].buf0 = dma_map_single(NULL, skb->data,
                    skb_headlen(skb), DMA_TO_DEVICE);
            data->txring[tx].len = skb_headlen(skb);
            misc |= TSI108_TX_SOF;
        } else {
            const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];

            data->txring[tx].buf0 = skb_frag_dma_map(NULL, frag,
                                 0,
                                 skb_frag_size(frag),
                                 DMA_TO_DEVICE);
            data->txring[tx].len = skb_frag_size(frag);
        }

        if (i == frags - 1)
            misc |= TSI108_TX_EOF;

        if (netif_msg_pktdata(data)) {
            int i;
            printk("%s: Tx Frame contents (%d)\n", dev->name,
                   skb->len);
            for (i = 0; i < skb->len; i++)
                printk(" %2.2x", skb->data[i]);
            printk(".\n");
        }
        data->txring[tx].misc = misc | TSI108_TX_OWN;

        data->txhead = (data->txhead + 1) % TSI108_TXRING_LEN;
        data->txfree--;
    }

    tsi108_complete_tx(dev);

    /* This must be done after the check for completed tx descriptors,
     * so that the tail pointer is correct.
     */

    if (!(TSI_READ(TSI108_EC_TXSTAT) & TSI108_EC_TXSTAT_QUEUE0))
        tsi108_restart_tx(data);

    spin_unlock_irq(&data->txlock);
    return NETDEV_TX_OK;
}

static int tsi108_complete_rx(struct net_device *dev, int budget)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    int done = 0;

    while (data->rxfree && done != budget) {
        int rx = data->rxtail;
        struct sk_buff *skb;

        if (data->rxring[rx].misc & TSI108_RX_OWN)
            break;

        skb = data->rxskbs[rx];
        data->rxtail = (data->rxtail + 1) % TSI108_RXRING_LEN;
        data->rxfree--;
        done++;

        if (data->rxring[rx].misc & TSI108_RX_BAD) {
            spin_lock_irq(&data->misclock);

            if (data->rxring[rx].misc & TSI108_RX_CRC)
                data->stats.rx_crc_errors++;
            if (data->rxring[rx].misc & TSI108_RX_OVER)
                data->stats.rx_fifo_errors++;

            spin_unlock_irq(&data->misclock);

            dev_kfree_skb_any(skb);
            continue;
        }
        if (netif_msg_pktdata(data)) {
            int i;
            printk("%s: Rx Frame contents (%d)\n",
                   dev->name, data->rxring[rx].len);
            for (i = 0; i < data->rxring[rx].len; i++)
                printk(" %2.2x", skb->data[i]);
            printk(".\n");
        }

        skb_put(skb, data->rxring[rx].len);
        skb->protocol = eth_type_trans(skb, dev);
        netif_receive_skb(skb);
    }

    return done;
}

static int tsi108_refill_rx(struct net_device *dev, int budget)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    int done = 0;

    while (data->rxfree != TSI108_RXRING_LEN && done != budget) {
        int rx = data->rxhead;
        struct sk_buff *skb;

        skb = netdev_alloc_skb_ip_align(dev, TSI108_RXBUF_SIZE);
        data->rxskbs[rx] = skb;
        if (!skb)
            break;

        data->rxring[rx].buf0 = dma_map_single(NULL, skb->data,
                            TSI108_RX_SKB_SIZE,
                            DMA_FROM_DEVICE);

        /* Sometimes the hardware sets blen to zero after packet
         * reception, even though the manual says that it's only ever
         * modified by the driver.
         */

        data->rxring[rx].blen = TSI108_RX_SKB_SIZE;
        data->rxring[rx].misc = TSI108_RX_OWN | TSI108_RX_INT;

        data->rxhead = (data->rxhead + 1) % TSI108_RXRING_LEN;
        data->rxfree++;
        done++;
    }

    if (done != 0 && !(TSI_READ(TSI108_EC_RXSTAT) &
               TSI108_EC_RXSTAT_QUEUE0))
        tsi108_restart_rx(data, dev);

    return done;
}

static int tsi108_poll(struct napi_struct *napi, int budget)
{
    struct tsi108_prv_data *data = container_of(napi, struct tsi108_prv_data, napi);
    struct net_device *dev = data->dev;
    u32 estat = TSI_READ(TSI108_EC_RXESTAT);
    u32 intstat = TSI_READ(TSI108_EC_INTSTAT);
    int num_received = 0, num_filled = 0;

    intstat &= TSI108_INT_RXQUEUE0 | TSI108_INT_RXTHRESH |
        TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR | TSI108_INT_RXWAIT;

    TSI_WRITE(TSI108_EC_RXESTAT, estat);
    TSI_WRITE(TSI108_EC_INTSTAT, intstat);

    if (data->rxpending || (estat & TSI108_EC_RXESTAT_Q0_DESCINT))
        num_received = tsi108_complete_rx(dev, budget);

    /* This should normally fill no more slots than the number of
     * packets received in tsi108_complete_rx().  The exception
     * is when we previously ran out of memory for RX SKBs.  In that
     * case, it's helpful to obey the budget, not only so that the
     * CPU isn't hogged, but so that memory (which may still be low)
     * is not hogged by one device.
     *
     * A work unit is considered to be two SKBs to allow us to catch
     * up when the ring has shrunk due to out-of-memory but we're
     * still removing the full budget's worth of packets each time.
     */

    if (data->rxfree < TSI108_RXRING_LEN)
        num_filled = tsi108_refill_rx(dev, budget * 2);

    if (intstat & TSI108_INT_RXERROR) {
        u32 err = TSI_READ(TSI108_EC_RXERR);
        TSI_WRITE(TSI108_EC_RXERR, err);

        if (err) {
            if (net_ratelimit())
                printk(KERN_DEBUG "%s: RX error %x\n",
                       dev->name, err);

            if (!(TSI_READ(TSI108_EC_RXSTAT) &
                  TSI108_EC_RXSTAT_QUEUE0))
                tsi108_restart_rx(data, dev);
        }
    }

    if (intstat & TSI108_INT_RXOVERRUN) {
        spin_lock_irq(&data->misclock);
        data->stats.rx_fifo_errors++;
        spin_unlock_irq(&data->misclock);
    }

    if (num_received < budget) {
        data->rxpending = 0;
        napi_complete(napi);

        TSI_WRITE(TSI108_EC_INTMASK,
                     TSI_READ(TSI108_EC_INTMASK)
                     & ~(TSI108_INT_RXQUEUE0
                     | TSI108_INT_RXTHRESH |
                     TSI108_INT_RXOVERRUN |
                     TSI108_INT_RXERROR |
                     TSI108_INT_RXWAIT));
    } else {
        data->rxpending = 1;
    }

    return num_received;
}

static void tsi108_rx_int(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);

    /* A race could cause dev to already be scheduled, so it's not an
     * error if that happens (and interrupts shouldn't be re-masked,
     * because that can cause harmful races, if poll has already
     * unmasked them but not cleared LINK_STATE_SCHED).
     *
     * This can happen if this code races with tsi108_poll(), which masks
     * the interrupts after tsi108_irq_one() read the mask, but before
     * napi_schedule is called.  It could also happen due to calls
     * from tsi108_check_rxring().
     */

    if (napi_schedule_prep(&data->napi)) {
        /* Mask, rather than ack, the receive interrupts.  The ack
         * will happen in tsi108_poll().
         */

        TSI_WRITE(TSI108_EC_INTMASK,
                     TSI_READ(TSI108_EC_INTMASK) |
                     TSI108_INT_RXQUEUE0
                     | TSI108_INT_RXTHRESH |
                     TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR |
                     TSI108_INT_RXWAIT);
        __napi_schedule(&data->napi);
    } else {
        if (!netif_running(dev)) {
            /* This can happen if an interrupt occurs while the
             * interface is being brought down, as the START
             * bit is cleared before the stop function is called.
             *
             * In this case, the interrupts must be masked, or
             * they will continue indefinitely.
             *
             * There's a race here if the interface is brought down
             * and then up in rapid succession, as the device could
             * be made running after the above check and before
             * the masking below.  This will only happen if the IRQ
             * thread has a lower priority than the task brining
             * up the interface.  Fixing this race would likely
             * require changes in generic code.
             */

            TSI_WRITE(TSI108_EC_INTMASK,
                         TSI_READ
                         (TSI108_EC_INTMASK) |
                         TSI108_INT_RXQUEUE0 |
                         TSI108_INT_RXTHRESH |
                         TSI108_INT_RXOVERRUN |
                         TSI108_INT_RXERROR |
                         TSI108_INT_RXWAIT);
        }
    }
}

/* If the RX ring has run out of memory, try periodically
 * to allocate some more, as otherwise poll would never
 * get called (apart from the initial end-of-queue condition).
 *
 * This is called once per second (by default) from the thread.
 */

static void tsi108_check_rxring(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);

    /* A poll is scheduled, as opposed to caling tsi108_refill_rx
     * directly, so as to keep the receive path single-threaded
     * (and thus not needing a lock).
     */

    if (netif_running(dev) && data->rxfree < TSI108_RXRING_LEN / 4)
        tsi108_rx_int(dev);
}

static void tsi108_tx_int(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 estat = TSI_READ(TSI108_EC_TXESTAT);

    TSI_WRITE(TSI108_EC_TXESTAT, estat);
    TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_TXQUEUE0 |
                 TSI108_INT_TXIDLE | TSI108_INT_TXERROR);
    if (estat & TSI108_EC_TXESTAT_Q0_ERR) {
        u32 err = TSI_READ(TSI108_EC_TXERR);
        TSI_WRITE(TSI108_EC_TXERR, err);

        if (err && net_ratelimit())
            printk(KERN_ERR "%s: TX error %x\n", dev->name, err);
    }

    if (estat & (TSI108_EC_TXESTAT_Q0_DESCINT | TSI108_EC_TXESTAT_Q0_EOQ)) {
        spin_lock(&data->txlock);
        tsi108_complete_tx(dev);
        spin_unlock(&data->txlock);
    }
}


static irqreturn_t tsi108_irq(int irq, void *dev_id)
{
    struct net_device *dev = dev_id;
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 stat = TSI_READ(TSI108_EC_INTSTAT);

    if (!(stat & TSI108_INT_ANY))
        return IRQ_NONE;    /* Not our interrupt */

    stat &= ~TSI_READ(TSI108_EC_INTMASK);

    if (stat & (TSI108_INT_TXQUEUE0 | TSI108_INT_TXIDLE |
            TSI108_INT_TXERROR))
        tsi108_tx_int(dev);
    if (stat & (TSI108_INT_RXQUEUE0 | TSI108_INT_RXTHRESH |
            TSI108_INT_RXWAIT | TSI108_INT_RXOVERRUN |
            TSI108_INT_RXERROR))
        tsi108_rx_int(dev);

    if (stat & TSI108_INT_SFN) {
        if (net_ratelimit())
            printk(KERN_DEBUG "%s: SFN error\n", dev->name);
        TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_SFN);
    }

    if (stat & TSI108_INT_STATCARRY) {
        tsi108_stat_carry(dev);
        TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_STATCARRY);
    }

    return IRQ_HANDLED;
}

static void tsi108_stop_ethernet(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    int i = 1000;
    /* Disable all TX and RX queues ... */
    TSI_WRITE(TSI108_EC_TXCTRL, 0);
    TSI_WRITE(TSI108_EC_RXCTRL, 0);

    /* ...and wait for them to become idle */
    while(i--) {
        if(!(TSI_READ(TSI108_EC_TXSTAT) & TSI108_EC_TXSTAT_ACTIVE))
            break;
        udelay(10);
    }
    i = 1000;
    while(i--){
        if(!(TSI_READ(TSI108_EC_RXSTAT) & TSI108_EC_RXSTAT_ACTIVE))
            return;
        udelay(10);
    }
    printk(KERN_ERR "%s function time out\n", __func__);
}

static void tsi108_reset_ether(struct tsi108_prv_data * data)
{
    TSI_WRITE(TSI108_MAC_CFG1, TSI108_MAC_CFG1_SOFTRST);
    udelay(100);
    TSI_WRITE(TSI108_MAC_CFG1, 0);

    TSI_WRITE(TSI108_EC_PORTCTRL, TSI108_EC_PORTCTRL_STATRST);
    udelay(100);
    TSI_WRITE(TSI108_EC_PORTCTRL,
                 TSI_READ(TSI108_EC_PORTCTRL) &
                 ~TSI108_EC_PORTCTRL_STATRST);

    TSI_WRITE(TSI108_EC_TXCFG, TSI108_EC_TXCFG_RST);
    udelay(100);
    TSI_WRITE(TSI108_EC_TXCFG,
                 TSI_READ(TSI108_EC_TXCFG) &
                 ~TSI108_EC_TXCFG_RST);

    TSI_WRITE(TSI108_EC_RXCFG, TSI108_EC_RXCFG_RST);
    udelay(100);
    TSI_WRITE(TSI108_EC_RXCFG,
                 TSI_READ(TSI108_EC_RXCFG) &
                 ~TSI108_EC_RXCFG_RST);

    TSI_WRITE(TSI108_MAC_MII_MGMT_CFG,
                 TSI_READ(TSI108_MAC_MII_MGMT_CFG) |
                 TSI108_MAC_MII_MGMT_RST);
    udelay(100);
    TSI_WRITE(TSI108_MAC_MII_MGMT_CFG,
                 (TSI_READ(TSI108_MAC_MII_MGMT_CFG) &
                 ~(TSI108_MAC_MII_MGMT_RST |
                   TSI108_MAC_MII_MGMT_CLK)) | 0x07);
}

static int tsi108_get_mac(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 word1 = TSI_READ(TSI108_MAC_ADDR1);
    u32 word2 = TSI_READ(TSI108_MAC_ADDR2);

    /* Note that the octets are reversed from what the manual says,
     * producing an even weirder ordering...
     */
    if (word2 == 0 && word1 == 0) {
        dev->dev_addr[0] = 0x00;
        dev->dev_addr[1] = 0x06;
        dev->dev_addr[2] = 0xd2;
        dev->dev_addr[3] = 0x00;
        dev->dev_addr[4] = 0x00;
        if (0x8 == data->phy)
            dev->dev_addr[5] = 0x01;
        else
            dev->dev_addr[5] = 0x02;

        word2 = (dev->dev_addr[0] << 16) | (dev->dev_addr[1] << 24);

        word1 = (dev->dev_addr[2] << 0) | (dev->dev_addr[3] << 8) |
            (dev->dev_addr[4] << 16) | (dev->dev_addr[5] << 24);

        TSI_WRITE(TSI108_MAC_ADDR1, word1);
        TSI_WRITE(TSI108_MAC_ADDR2, word2);
    } else {
        dev->dev_addr[0] = (word2 >> 16) & 0xff;
        dev->dev_addr[1] = (word2 >> 24) & 0xff;
        dev->dev_addr[2] = (word1 >> 0) & 0xff;
        dev->dev_addr[3] = (word1 >> 8) & 0xff;
        dev->dev_addr[4] = (word1 >> 16) & 0xff;
        dev->dev_addr[5] = (word1 >> 24) & 0xff;
    }

    if (!is_valid_ether_addr(dev->dev_addr)) {
        printk(KERN_ERR
               "%s: Invalid MAC address. word1: %08x, word2: %08x\n",
               dev->name, word1, word2);
        return -EINVAL;
    }

    return 0;
}

static int tsi108_set_mac(struct net_device *dev, void *addr)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 word1, word2;
    int i;

    if (!is_valid_ether_addr(addr))
        return -EADDRNOTAVAIL;

    for (i = 0; i < 6; i++)
        /* +2 is for the offset of the HW addr type */
        dev->dev_addr[i] = ((unsigned char *)addr)[i + 2];

    word2 = (dev->dev_addr[0] << 16) | (dev->dev_addr[1] << 24);

    word1 = (dev->dev_addr[2] << 0) | (dev->dev_addr[3] << 8) |
        (dev->dev_addr[4] << 16) | (dev->dev_addr[5] << 24);

    spin_lock_irq(&data->misclock);
    TSI_WRITE(TSI108_MAC_ADDR1, word1);
    TSI_WRITE(TSI108_MAC_ADDR2, word2);
    spin_lock(&data->txlock);

    if (data->txfree && data->link_up)
        netif_wake_queue(dev);

    spin_unlock(&data->txlock);
    spin_unlock_irq(&data->misclock);
    return 0;
}

/* Protected by dev->xmit_lock. */
static void tsi108_set_rx_mode(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 rxcfg = TSI_READ(TSI108_EC_RXCFG);

    if (dev->flags & IFF_PROMISC) {
        rxcfg &= ~(TSI108_EC_RXCFG_UC_HASH | TSI108_EC_RXCFG_MC_HASH);
        rxcfg |= TSI108_EC_RXCFG_UFE | TSI108_EC_RXCFG_MFE;
        goto out;
    }

    rxcfg &= ~(TSI108_EC_RXCFG_UFE | TSI108_EC_RXCFG_MFE);

    if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
        int i;
        struct netdev_hw_addr *ha;
        rxcfg |= TSI108_EC_RXCFG_MFE | TSI108_EC_RXCFG_MC_HASH;

        memset(data->mc_hash, 0, sizeof(data->mc_hash));

        netdev_for_each_mc_addr(ha, dev) {
            u32 hash, crc;

            crc = ether_crc(6, ha->addr);
            hash = crc >> 23;
            __set_bit(hash, &data->mc_hash[0]);
        }

        TSI_WRITE(TSI108_EC_HASHADDR,
                     TSI108_EC_HASHADDR_AUTOINC |
                     TSI108_EC_HASHADDR_MCAST);

        for (i = 0; i < 16; i++) {
            /* The manual says that the hardware may drop
             * back-to-back writes to the data register.
             */
            udelay(1);
            TSI_WRITE(TSI108_EC_HASHDATA,
                         data->mc_hash[i]);
        }
    }

      out:
    TSI_WRITE(TSI108_EC_RXCFG, rxcfg);
}

static void tsi108_init_phy(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    u32 i = 0;
    u16 phyval = 0;
    unsigned long flags;

    spin_lock_irqsave(&phy_lock, flags);

    tsi108_write_mii(data, MII_BMCR, BMCR_RESET);
    while (--i) {
        if(!(tsi108_read_mii(data, MII_BMCR) & BMCR_RESET))
            break;
        udelay(10);
    }
    if (i == 0)
        printk(KERN_ERR "%s function time out\n", __func__);

    if (data->phy_type == TSI108_PHY_BCM54XX) {
        tsi108_write_mii(data, 0x09, 0x0300);
        tsi108_write_mii(data, 0x10, 0x1020);
        tsi108_write_mii(data, 0x1c, 0x8c00);
    }

    tsi108_write_mii(data,
             MII_BMCR,
             BMCR_ANENABLE | BMCR_ANRESTART);
    while (tsi108_read_mii(data, MII_BMCR) & BMCR_ANRESTART)
        cpu_relax();

    /* Set G/MII mode and receive clock select in TBI control #2.  The
     * second port won't work if this isn't done, even though we don't
     * use TBI mode.
     */

    tsi108_write_tbi(data, 0x11, 0x30);

    /* FIXME: It seems to take more than 2 back-to-back reads to the
     * PHY_STAT register before the link up status bit is set.
     */

    data->link_up = 0;

    while (!((phyval = tsi108_read_mii(data, MII_BMSR)) &
         BMSR_LSTATUS)) {
        if (i++ > (MII_READ_DELAY / 10)) {
            break;
        }
        spin_unlock_irqrestore(&phy_lock, flags);
        msleep(10);
        spin_lock_irqsave(&phy_lock, flags);
    }

    data->mii_if.supports_gmii = mii_check_gmii_support(&data->mii_if);
    printk(KERN_DEBUG "PHY_STAT reg contains %08x\n", phyval);
    data->phy_ok = 1;
    data->init_media = 1;
    spin_unlock_irqrestore(&phy_lock, flags);
}

static void tsi108_kill_phy(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    unsigned long flags;

    spin_lock_irqsave(&phy_lock, flags);
    tsi108_write_mii(data, MII_BMCR, BMCR_PDOWN);
    data->phy_ok = 0;
    spin_unlock_irqrestore(&phy_lock, flags);
}

static int tsi108_open(struct net_device *dev)
{
    int i;
    struct tsi108_prv_data *data = netdev_priv(dev);
    unsigned int rxring_size = TSI108_RXRING_LEN * sizeof(rx_desc);
    unsigned int txring_size = TSI108_TXRING_LEN * sizeof(tx_desc);

    i = request_irq(data->irq_num, tsi108_irq, 0, dev->name, dev);
    if (i != 0) {
        printk(KERN_ERR "tsi108_eth%d: Could not allocate IRQ%d.\n",
               data->id, data->irq_num);
        return i;
    } else {
        dev->irq = data->irq_num;
        printk(KERN_NOTICE
               "tsi108_open : Port %d Assigned IRQ %d to %s\n",
               data->id, dev->irq, dev->name);
    }

    data->rxring = dma_alloc_coherent(NULL, rxring_size,
            &data->rxdma, GFP_KERNEL);

    if (!data->rxring) {
        printk(KERN_DEBUG
               "TSI108_ETH: failed to allocate memory for rxring!\n");
        return -ENOMEM;
    } else {
        memset(data->rxring, 0, rxring_size);
    }

    data->txring = dma_alloc_coherent(NULL, txring_size,
            &data->txdma, GFP_KERNEL);

    if (!data->txring) {
        printk(KERN_DEBUG
               "TSI108_ETH: failed to allocate memory for txring!\n");
        pci_free_consistent(0, rxring_size, data->rxring, data->rxdma);
        return -ENOMEM;
    } else {
        memset(data->txring, 0, txring_size);
    }

    for (i = 0; i < TSI108_RXRING_LEN; i++) {
        data->rxring[i].next0 = data->rxdma + (i + 1) * sizeof(rx_desc);
        data->rxring[i].blen = TSI108_RXBUF_SIZE;
        data->rxring[i].vlan = 0;
    }

    data->rxring[TSI108_RXRING_LEN - 1].next0 = data->rxdma;

    data->rxtail = 0;
    data->rxhead = 0;

    for (i = 0; i < TSI108_RXRING_LEN; i++) {
        struct sk_buff *skb;

        skb = netdev_alloc_skb_ip_align(dev, TSI108_RXBUF_SIZE);
        if (!skb) {
            /* Bah.  No memory for now, but maybe we'll get
             * some more later.
             * For now, we'll live with the smaller ring.
             */
            printk(KERN_WARNING
                   "%s: Could only allocate %d receive skb(s).\n",
                   dev->name, i);
            data->rxhead = i;
            break;
        }

        data->rxskbs[i] = skb;
        data->rxring[i].buf0 = virt_to_phys(data->rxskbs[i]->data);
        data->rxring[i].misc = TSI108_RX_OWN | TSI108_RX_INT;
    }

    data->rxfree = i;
    TSI_WRITE(TSI108_EC_RXQ_PTRLOW, data->rxdma);

    for (i = 0; i < TSI108_TXRING_LEN; i++) {
        data->txring[i].next0 = data->txdma + (i + 1) * sizeof(tx_desc);
        data->txring[i].misc = 0;
    }

    data->txring[TSI108_TXRING_LEN - 1].next0 = data->txdma;
    data->txtail = 0;
    data->txhead = 0;
    data->txfree = TSI108_TXRING_LEN;
    TSI_WRITE(TSI108_EC_TXQ_PTRLOW, data->txdma);
    tsi108_init_phy(dev);

    napi_enable(&data->napi);

    setup_timer(&data->timer, tsi108_timed_checker, (unsigned long)dev);
    mod_timer(&data->timer, jiffies + 1);

    tsi108_restart_rx(data, dev);

    TSI_WRITE(TSI108_EC_INTSTAT, ~0);

    TSI_WRITE(TSI108_EC_INTMASK,
                 ~(TSI108_INT_TXQUEUE0 | TSI108_INT_RXERROR |
                   TSI108_INT_RXTHRESH | TSI108_INT_RXQUEUE0 |
                   TSI108_INT_RXOVERRUN | TSI108_INT_RXWAIT |
                   TSI108_INT_SFN | TSI108_INT_STATCARRY));

    TSI_WRITE(TSI108_MAC_CFG1,
                 TSI108_MAC_CFG1_RXEN | TSI108_MAC_CFG1_TXEN);
    netif_start_queue(dev);
    return 0;
}

static int tsi108_close(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);

    netif_stop_queue(dev);
    napi_disable(&data->napi);

    del_timer_sync(&data->timer);

    tsi108_stop_ethernet(dev);
    tsi108_kill_phy(dev);
    TSI_WRITE(TSI108_EC_INTMASK, ~0);
    TSI_WRITE(TSI108_MAC_CFG1, 0);

    /* Check for any pending TX packets, and drop them. */

    while (!data->txfree || data->txhead != data->txtail) {
        int tx = data->txtail;
        struct sk_buff *skb;
        skb = data->txskbs[tx];
        data->txtail = (data->txtail + 1) % TSI108_TXRING_LEN;
        data->txfree++;
        dev_kfree_skb(skb);
    }

    free_irq(data->irq_num, dev);

    /* Discard the RX ring. */

    while (data->rxfree) {
        int rx = data->rxtail;
        struct sk_buff *skb;

        skb = data->rxskbs[rx];
        data->rxtail = (data->rxtail + 1) % TSI108_RXRING_LEN;
        data->rxfree--;
        dev_kfree_skb(skb);
    }

    dma_free_coherent(0,
                TSI108_RXRING_LEN * sizeof(rx_desc),
                data->rxring, data->rxdma);
    dma_free_coherent(0,
                TSI108_TXRING_LEN * sizeof(tx_desc),
                data->txring, data->txdma);

    return 0;
}

static void tsi108_init_mac(struct net_device *dev)
{
    struct tsi108_prv_data *data = netdev_priv(dev);

    TSI_WRITE(TSI108_MAC_CFG2, TSI108_MAC_CFG2_DFLT_PREAMBLE |
                 TSI108_MAC_CFG2_PADCRC);

    TSI_WRITE(TSI108_EC_TXTHRESH,
                 (192 << TSI108_EC_TXTHRESH_STARTFILL) |
                 (192 << TSI108_EC_TXTHRESH_STOPFILL));

    TSI_WRITE(TSI108_STAT_CARRYMASK1,
                 ~(TSI108_STAT_CARRY1_RXBYTES |
                   TSI108_STAT_CARRY1_RXPKTS |
                   TSI108_STAT_CARRY1_RXFCS |
                   TSI108_STAT_CARRY1_RXMCAST |
                   TSI108_STAT_CARRY1_RXALIGN |
                   TSI108_STAT_CARRY1_RXLENGTH |
                   TSI108_STAT_CARRY1_RXRUNT |
                   TSI108_STAT_CARRY1_RXJUMBO |
                   TSI108_STAT_CARRY1_RXFRAG |
                   TSI108_STAT_CARRY1_RXJABBER |
                   TSI108_STAT_CARRY1_RXDROP));

    TSI_WRITE(TSI108_STAT_CARRYMASK2,
                 ~(TSI108_STAT_CARRY2_TXBYTES |
                   TSI108_STAT_CARRY2_TXPKTS |
                   TSI108_STAT_CARRY2_TXEXDEF |
                   TSI108_STAT_CARRY2_TXEXCOL |
                   TSI108_STAT_CARRY2_TXTCOL |
                   TSI108_STAT_CARRY2_TXPAUSE));

    TSI_WRITE(TSI108_EC_PORTCTRL, TSI108_EC_PORTCTRL_STATEN);
    TSI_WRITE(TSI108_MAC_CFG1, 0);

    TSI_WRITE(TSI108_EC_RXCFG,
                 TSI108_EC_RXCFG_SE | TSI108_EC_RXCFG_BFE);

    TSI_WRITE(TSI108_EC_TXQ_CFG, TSI108_EC_TXQ_CFG_DESC_INT |
                 TSI108_EC_TXQ_CFG_EOQ_OWN_INT |
                 TSI108_EC_TXQ_CFG_WSWP | (TSI108_PBM_PORT <<
                        TSI108_EC_TXQ_CFG_SFNPORT));

    TSI_WRITE(TSI108_EC_RXQ_CFG, TSI108_EC_RXQ_CFG_DESC_INT |
                 TSI108_EC_RXQ_CFG_EOQ_OWN_INT |
                 TSI108_EC_RXQ_CFG_WSWP | (TSI108_PBM_PORT <<
                        TSI108_EC_RXQ_CFG_SFNPORT));

    TSI_WRITE(TSI108_EC_TXQ_BUFCFG,
                 TSI108_EC_TXQ_BUFCFG_BURST256 |
                 TSI108_EC_TXQ_BUFCFG_BSWP | (TSI108_PBM_PORT <<
                        TSI108_EC_TXQ_BUFCFG_SFNPORT));

    TSI_WRITE(TSI108_EC_RXQ_BUFCFG,
                 TSI108_EC_RXQ_BUFCFG_BURST256 |
                 TSI108_EC_RXQ_BUFCFG_BSWP | (TSI108_PBM_PORT <<
                        TSI108_EC_RXQ_BUFCFG_SFNPORT));

    TSI_WRITE(TSI108_EC_INTMASK, ~0);
}

static int tsi108_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    unsigned long flags;
    int rc;

    spin_lock_irqsave(&data->txlock, flags);
    rc = mii_ethtool_gset(&data->mii_if, cmd);
    spin_unlock_irqrestore(&data->txlock, flags);

    return rc;
}

static int tsi108_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    unsigned long flags;
    int rc;

    spin_lock_irqsave(&data->txlock, flags);
    rc = mii_ethtool_sset(&data->mii_if, cmd);
    spin_unlock_irqrestore(&data->txlock, flags);

    return rc;
}

static int tsi108_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
    struct tsi108_prv_data *data = netdev_priv(dev);
    if (!netif_running(dev))
        return -EINVAL;
    return generic_mii_ioctl(&data->mii_if, if_mii(rq), cmd, NULL);
}

static const struct ethtool_ops tsi108_ethtool_ops = {
    .get_link   = ethtool_op_get_link,
    .get_settings   = tsi108_get_settings,
    .set_settings   = tsi108_set_settings,
};

static const struct net_device_ops tsi108_netdev_ops = {
    .ndo_open       = tsi108_open,
    .ndo_stop       = tsi108_close,
    .ndo_start_xmit     = tsi108_send_packet,
    .ndo_set_rx_mode    = tsi108_set_rx_mode,
    .ndo_get_stats      = tsi108_get_stats,
    .ndo_do_ioctl       = tsi108_do_ioctl,
    .ndo_set_mac_address    = tsi108_set_mac,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_change_mtu     = eth_change_mtu,
};

static int
tsi108_init_one(struct platform_device *pdev)
{
    struct net_device *dev = NULL;
    struct tsi108_prv_data *data = NULL;
    hw_info *einfo;
    int err = 0;

    einfo = pdev->dev.platform_data;

    if (NULL == einfo) {
        printk(KERN_ERR "tsi-eth %d: Missing additional data!\n",
               pdev->id);
        return -ENODEV;
    }

    /* Create an ethernet device instance */

    dev = alloc_etherdev(sizeof(struct tsi108_prv_data));
    if (!dev)
        return -ENOMEM;

    printk("tsi108_eth%d: probe...\n", pdev->id);
    data = netdev_priv(dev);
    data->dev = dev;

    pr_debug("tsi108_eth%d:regs:phyresgs:phy:irq_num=0x%x:0x%x:0x%x:0x%x\n",
            pdev->id, einfo->regs, einfo->phyregs,
            einfo->phy, einfo->irq_num);

    data->regs = ioremap(einfo->regs, 0x400);
    if (NULL == data->regs) {
        err = -ENOMEM;
        goto regs_fail;
    }

    data->phyregs = ioremap(einfo->phyregs, 0x400);
    if (NULL == data->phyregs) {
        err = -ENOMEM;
        goto phyregs_fail;
    }
/* MII setup */
    data->mii_if.dev = dev;
    data->mii_if.mdio_read = tsi108_mdio_read;
    data->mii_if.mdio_write = tsi108_mdio_write;
    data->mii_if.phy_id = einfo->phy;
    data->mii_if.phy_id_mask = 0x1f;
    data->mii_if.reg_num_mask = 0x1f;

    data->phy = einfo->phy;
    data->phy_type = einfo->phy_type;
    data->irq_num = einfo->irq_num;
    data->id = pdev->id;
    netif_napi_add(dev, &data->napi, tsi108_poll, 64);
    dev->netdev_ops = &tsi108_netdev_ops;
    dev->ethtool_ops = &tsi108_ethtool_ops;

    /* Apparently, the Linux networking code won't use scatter-gather
     * if the hardware doesn't do checksums.  However, it's faster
     * to checksum in place and use SG, as (among other reasons)
     * the cache won't be dirtied (which then has to be flushed
     * before DMA).  The checksumming is done by the driver (via
     * a new function skb_csum_dev() in net/core/skbuff.c).
     */

    dev->features = NETIF_F_HIGHDMA;

    spin_lock_init(&data->txlock);
    spin_lock_init(&data->misclock);

    tsi108_reset_ether(data);
    tsi108_kill_phy(dev);

    if ((err = tsi108_get_mac(dev)) != 0) {
        printk(KERN_ERR "%s: Invalid MAC address.  Please correct.\n",
               dev->name);
        goto register_fail;
    }

    tsi108_init_mac(dev);
    err = register_netdev(dev);
    if (err) {
        printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
                dev->name);
        goto register_fail;
    }

    platform_set_drvdata(pdev, dev);
    printk(KERN_INFO "%s: Tsi108 Gigabit Ethernet, MAC: %pM\n",
           dev->name, dev->dev_addr);
#ifdef DEBUG
    data->msg_enable = DEBUG;
    dump_eth_one(dev);
#endif

    return 0;

register_fail:
    iounmap(data->phyregs);

phyregs_fail:
    iounmap(data->regs);

regs_fail:
    free_netdev(dev);
    return err;
}

/* There's no way to either get interrupts from the PHY when
 * something changes, or to have the Tsi108 automatically communicate
 * with the PHY to reconfigure itself.
 *
 * Thus, we have to do it using a timer.
 */

static void tsi108_timed_checker(unsigned long dev_ptr)
{
    struct net_device *dev = (struct net_device *)dev_ptr;
    struct tsi108_prv_data *data = netdev_priv(dev);

    tsi108_check_phy(dev);
    tsi108_check_rxring(dev);
    mod_timer(&data->timer, jiffies + CHECK_PHY_INTERVAL);
}

static int tsi108_ether_remove(struct platform_device *pdev)
{
    struct net_device *dev = platform_get_drvdata(pdev);
    struct tsi108_prv_data *priv = netdev_priv(dev);

    unregister_netdev(dev);
    tsi108_stop_ethernet(dev);
    platform_set_drvdata(pdev, NULL);
    iounmap(priv->regs);
    iounmap(priv->phyregs);
    free_netdev(dev);

    return 0;
}
module_platform_driver(tsi_eth_driver);

MODULE_AUTHOR("Tundra Semiconductor Corporation");
MODULE_DESCRIPTION("Tsi108 Gigabit Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tsi-ethernet");