// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************

  Copyright(c) 2006 Tundra Semiconductor Corporation.


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

/* This driver is based on the driver code originally developed
 * for the Intel IOC80314 (ForestLake) Gigabit Ethernet by
 * scott.wood@timesys.com  * Copyright (C) 2003 TimeSys Corporation
 *
 * Currently changes from original version are:
 * - porting to Tsi108-based platform and kernel 2.6 (kong.lai@tundra.com)
 * - modifications to handle two ports independently and support for
 *   additional PHY devices (alexandre.bounine@tundra.com)
 * - Get hardware information from platform device. (tie-fei.zang@freescale.com)
 *
 */

#include <linux/module.h>
#include <linux/types.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;

        struct platform_device *pdev;
};

/* Structure for a device driver */

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

static void tsi108_timed_checker(struct timer_list *t);

#ifdef DEBUG
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);
}
#endif

/* 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);
        unsigned long flags;
        u32 carry1, carry2;

        spin_lock_irqsave(&data->misclock, flags);

        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_irqrestore(&data->misclock, flags);
}

/* 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(&data->pdev->dev,
                                        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(&data->pdev->dev, 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(&data->pdev->dev,
                                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_done(napi, num_received);

                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(&data->pdev->dev, rxring_size,
                                          &data->rxdma, GFP_KERNEL);
        if (!data->rxring)
                return -ENOMEM;

        data->txring = dma_alloc_coherent(&data->pdev->dev, txring_size,
                                          &data->txdma, GFP_KERNEL);
        if (!data->txring) {
                dma_free_coherent(&data->pdev->dev, rxring_size, data->rxring,
                                    data->rxdma);
                return -ENOMEM;
        }

        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);

        timer_setup(&data->timer, tsi108_timed_checker, 0);
        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(&data->pdev->dev,
                            TSI108_RXRING_LEN * sizeof(rx_desc),
                            data->rxring, data->rxdma);
        dma_free_coherent(&data->pdev->dev,
                            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_link_ksettings(struct net_device *dev,
                                     struct ethtool_link_ksettings *cmd)
{
        struct tsi108_prv_data *data = netdev_priv(dev);
        unsigned long flags;

        spin_lock_irqsave(&data->txlock, flags);
        mii_ethtool_get_link_ksettings(&data->mii_if, cmd);
        spin_unlock_irqrestore(&data->txlock, flags);

        return 0;
}

static int tsi108_set_link_ksettings(struct net_device *dev,
                                     const struct ethtool_link_ksettings *cmd)
{
        struct tsi108_prv_data *data = netdev_priv(dev);
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&data->txlock, flags);
        rc = mii_ethtool_set_link_ksettings(&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_link_ksettings     = tsi108_get_link_ksettings,
        .set_link_ksettings     = tsi108_set_link_ksettings,
};

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_eth_ioctl          = tsi108_do_ioctl,
        .ndo_set_mac_address    = tsi108_set_mac,
        .ndo_validate_addr      = eth_validate_addr,
};

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 = dev_get_platdata(&pdev->dev);

        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;
        data->pdev = pdev;

        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(struct timer_list *t)
{
        struct tsi108_prv_data *data = from_timer(data, t, timer);
        struct net_device *dev = data->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);
        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");