eth_v10.c

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/*
 * e100net.c: A network driver for the ETRAX 100LX network controller.
 *
 * Copyright (c) 1998-2002 Axis Communications AB.
 *
 * The outline of this driver comes from skeleton.c.
 *
 */


#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/bitops.h>

#include <linux/if.h>
#include <linux/mii.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>

#include <arch/svinto.h>/* DMA and register descriptions */
#include <asm/io.h>         /* CRIS_LED_* I/O functions */
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/ethernet.h>
#include <asm/cache.h>
#include <arch/io_interface_mux.h>

//#define ETHDEBUG
#define D(x)

/*
 * The name of the card. Is used for messages and in the requests for
 * io regions, irqs and dma channels
 */

static const char* cardname = "ETRAX 100LX built-in ethernet controller";

/* A default ethernet address. Highlevel SW will set the real one later */

static struct sockaddr default_mac = {
    0,
    { 0x00, 0x40, 0x8C, 0xCD, 0x00, 0x00 }
};

/* Information that need to be kept for each board. */
struct net_local {
    struct mii_if_info mii_if;

    /* Tx control lock.  This protects the transmit buffer ring
     * state along with the "tx full" state of the driver.  This
     * means all netif_queue flow control actions are protected
     * by this lock as well.
     */
    spinlock_t lock;

    spinlock_t led_lock; /* Protect LED state */
    spinlock_t transceiver_lock; /* Protect transceiver state. */
};

typedef struct etrax_eth_descr
{
    etrax_dma_descr descr;
    struct sk_buff* skb;
} etrax_eth_descr;

/* Some transceivers requires special handling */
struct transceiver_ops
{
    unsigned int oui;
    void (*check_speed)(struct net_device* dev);
    void (*check_duplex)(struct net_device* dev);
};

/* Duplex settings */
enum duplex
{
    half,
    full,
    autoneg
};

/* Dma descriptors etc. */

#define MAX_MEDIA_DATA_SIZE 1522

#define MIN_PACKET_LEN      46
#define ETHER_HEAD_LEN      14

/*
** MDIO constants.
*/
#define MDIO_START                          0x1
#define MDIO_READ                           0x2
#define MDIO_WRITE                          0x1
#define MDIO_PREAMBLE              0xfffffffful

/* Broadcom specific */
#define MDIO_AUX_CTRL_STATUS_REG           0x18
#define MDIO_BC_FULL_DUPLEX_IND             0x1
#define MDIO_BC_SPEED                       0x2

/* TDK specific */
#define MDIO_TDK_DIAGNOSTIC_REG              18
#define MDIO_TDK_DIAGNOSTIC_RATE          0x400
#define MDIO_TDK_DIAGNOSTIC_DPLX          0x800

/*Intel LXT972A specific*/
#define MDIO_INT_STATUS_REG_2           0x0011
#define MDIO_INT_FULL_DUPLEX_IND       (1 << 9)
#define MDIO_INT_SPEED                (1 << 14)

/* Network flash constants */
#define NET_FLASH_TIME                  (HZ/50) /* 20 ms */
#define NET_FLASH_PAUSE                (HZ/100) /* 10 ms */
#define NET_LINK_UP_CHECK_INTERVAL       (2*HZ) /* 2 s   */
#define NET_DUPLEX_CHECK_INTERVAL        (2*HZ) /* 2 s   */

#define NO_NETWORK_ACTIVITY 0
#define NETWORK_ACTIVITY    1

#define NBR_OF_RX_DESC     32
#define NBR_OF_TX_DESC     16

/* Large packets are sent directly to upper layers while small packets are */
/* copied (to reduce memory waste). The following constant decides the breakpoint */
#define RX_COPYBREAK 256

/* Due to a chip bug we need to flush the cache when descriptors are returned */
/* to the DMA. To decrease performance impact we return descriptors in chunks. */
/* The following constant determines the number of descriptors to return. */
#define RX_QUEUE_THRESHOLD  NBR_OF_RX_DESC/2

#define GET_BIT(bit,val)   (((val) >> (bit)) & 0x01)

/* Define some macros to access ETRAX 100 registers */
#define SETF(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
                      IO_FIELD_(reg##_, field##_, val)
#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
                      IO_STATE_(reg##_, field##_, _##val)

static etrax_eth_descr *myNextRxDesc;  /* Points to the next descriptor to
                                          to be processed */
static etrax_eth_descr *myLastRxDesc;  /* The last processed descriptor */

static etrax_eth_descr RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned(32)));

static etrax_eth_descr* myFirstTxDesc; /* First packet not yet sent */
static etrax_eth_descr* myLastTxDesc;  /* End of send queue */
static etrax_eth_descr* myNextTxDesc;  /* Next descriptor to use */
static etrax_eth_descr TxDescList[NBR_OF_TX_DESC] __attribute__ ((aligned(32)));

static unsigned int network_rec_config_shadow = 0;

static unsigned int network_tr_ctrl_shadow = 0;

/* Network speed indication. */
static DEFINE_TIMER(speed_timer, NULL, 0, 0);
static DEFINE_TIMER(clear_led_timer, NULL, 0, 0);
static int current_speed; /* Speed read from transceiver */
static int current_speed_selection; /* Speed selected by user */
static unsigned long led_next_time;
static int led_active;
static int rx_queue_len;

/* Duplex */
static DEFINE_TIMER(duplex_timer, NULL, 0, 0);
static int full_duplex;
static enum duplex current_duplex;

/* Index to functions, as function prototypes. */

static int etrax_ethernet_init(void);

static int e100_open(struct net_device *dev);
static int e100_set_mac_address(struct net_device *dev, void *addr);
static int e100_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t e100rxtx_interrupt(int irq, void *dev_id);
static irqreturn_t e100nw_interrupt(int irq, void *dev_id);
static void e100_rx(struct net_device *dev);
static int e100_close(struct net_device *dev);
static int e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
static int e100_set_config(struct net_device* dev, struct ifmap* map);
static void e100_tx_timeout(struct net_device *dev);
static struct net_device_stats *e100_get_stats(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
static void e100_hardware_send_packet(struct net_local* np, char *buf, int length);
static void update_rx_stats(struct net_device_stats *);
static void update_tx_stats(struct net_device_stats *);
static int e100_probe_transceiver(struct net_device* dev);

static void e100_check_speed(unsigned long priv);
static void e100_set_speed(struct net_device* dev, unsigned long speed);
static void e100_check_duplex(unsigned long priv);
static void e100_set_duplex(struct net_device* dev, enum duplex);
static void e100_negotiate(struct net_device* dev);

static int e100_get_mdio_reg(struct net_device *dev, int phy_id, int location);
static void e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value);

static void e100_send_mdio_cmd(unsigned short cmd, int write_cmd);
static void e100_send_mdio_bit(unsigned char bit);
static unsigned char e100_receive_mdio_bit(void);
static void e100_reset_transceiver(struct net_device* net);

static void e100_clear_network_leds(unsigned long dummy);
static void e100_set_network_leds(int active);

static const struct ethtool_ops e100_ethtool_ops;
#if defined(CONFIG_ETRAX_NO_PHY)
static void dummy_check_speed(struct net_device* dev);
static void dummy_check_duplex(struct net_device* dev);
#else
static void broadcom_check_speed(struct net_device* dev);
static void broadcom_check_duplex(struct net_device* dev);
static void tdk_check_speed(struct net_device* dev);
static void tdk_check_duplex(struct net_device* dev);
static void intel_check_speed(struct net_device* dev);
static void intel_check_duplex(struct net_device* dev);
static void generic_check_speed(struct net_device* dev);
static void generic_check_duplex(struct net_device* dev);
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
static void e100_netpoll(struct net_device* dev);
#endif

static int autoneg_normal = 1;

struct transceiver_ops transceivers[] =
{
#if defined(CONFIG_ETRAX_NO_PHY)
    {0x0000, dummy_check_speed, dummy_check_duplex}        /* Dummy */
#else
    {0x1018, broadcom_check_speed, broadcom_check_duplex},  /* Broadcom */
    {0xC039, tdk_check_speed, tdk_check_duplex},            /* TDK 2120 */
    {0x039C, tdk_check_speed, tdk_check_duplex},            /* TDK 2120C */
        {0x04de, intel_check_speed, intel_check_duplex},        /* Intel LXT972A*/
    {0x0000, generic_check_speed, generic_check_duplex}     /* Generic, must be last */
#endif
};

struct transceiver_ops* transceiver = &transceivers[0];

static const struct net_device_ops e100_netdev_ops = {
    .ndo_open       = e100_open,
    .ndo_stop       = e100_close,
    .ndo_start_xmit     = e100_send_packet,
    .ndo_tx_timeout     = e100_tx_timeout,
    .ndo_get_stats      = e100_get_stats,
    .ndo_set_rx_mode    = set_multicast_list,
    .ndo_do_ioctl       = e100_ioctl,
    .ndo_set_mac_address    = e100_set_mac_address,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_config     = e100_set_config,
#ifdef CONFIG_NET_POLL_CONTROLLER
    .ndo_poll_controller    = e100_netpoll,
#endif
};

#define tx_done(dev) (*R_DMA_CH0_CMD == 0)

/*
 * Check for a network adaptor of this type, and return '0' if one exists.
 * If dev->base_addr == 0, probe all likely locations.
 * If dev->base_addr == 1, always return failure.
 * If dev->base_addr == 2, allocate space for the device and return success
 * (detachable devices only).
 */

static int __init
etrax_ethernet_init(void)
{
    struct net_device *dev;
        struct net_local* np;
    int i, err;

    printk(KERN_INFO
           "ETRAX 100LX 10/100MBit ethernet v2.0 (c) 1998-2007 Axis Communications AB\n");

    if (cris_request_io_interface(if_eth, cardname)) {
        printk(KERN_CRIT "etrax_ethernet_init failed to get IO interface\n");
        return -EBUSY;
    }

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

    np = netdev_priv(dev);

    /* we do our own locking */
    dev->features |= NETIF_F_LLTX;

    dev->base_addr = (unsigned int)R_NETWORK_SA_0; /* just to have something to show */

    /* now setup our etrax specific stuff */

    dev->irq = NETWORK_DMA_RX_IRQ_NBR; /* we really use DMATX as well... */
    dev->dma = NETWORK_RX_DMA_NBR;

    /* fill in our handlers so the network layer can talk to us in the future */

    dev->ethtool_ops    = &e100_ethtool_ops;
    dev->netdev_ops     = &e100_netdev_ops;

    spin_lock_init(&np->lock);
    spin_lock_init(&np->led_lock);
    spin_lock_init(&np->transceiver_lock);

    /* Initialise the list of Etrax DMA-descriptors */

    /* Initialise receive descriptors */

    for (i = 0; i < NBR_OF_RX_DESC; i++) {
        /* Allocate two extra cachelines to make sure that buffer used
         * by DMA does not share cacheline with any other data (to
         * avoid cache bug)
         */
        RxDescList[i].skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
        if (!RxDescList[i].skb)
            return -ENOMEM;
        RxDescList[i].descr.ctrl   = 0;
        RxDescList[i].descr.sw_len = MAX_MEDIA_DATA_SIZE;
        RxDescList[i].descr.next   = virt_to_phys(&RxDescList[i + 1]);
        RxDescList[i].descr.buf    = L1_CACHE_ALIGN(virt_to_phys(RxDescList[i].skb->data));
        RxDescList[i].descr.status = 0;
        RxDescList[i].descr.hw_len = 0;
        prepare_rx_descriptor(&RxDescList[i].descr);
    }

    RxDescList[NBR_OF_RX_DESC - 1].descr.ctrl   = d_eol;
    RxDescList[NBR_OF_RX_DESC - 1].descr.next   = virt_to_phys(&RxDescList[0]);
    rx_queue_len = 0;

    /* Initialize transmit descriptors */
    for (i = 0; i < NBR_OF_TX_DESC; i++) {
        TxDescList[i].descr.ctrl   = 0;
        TxDescList[i].descr.sw_len = 0;
        TxDescList[i].descr.next   = virt_to_phys(&TxDescList[i + 1].descr);
        TxDescList[i].descr.buf    = 0;
        TxDescList[i].descr.status = 0;
        TxDescList[i].descr.hw_len = 0;
        TxDescList[i].skb = 0;
    }

    TxDescList[NBR_OF_TX_DESC - 1].descr.ctrl   = d_eol;
    TxDescList[NBR_OF_TX_DESC - 1].descr.next   = virt_to_phys(&TxDescList[0].descr);

    /* Initialise initial pointers */

    myNextRxDesc  = &RxDescList[0];
    myLastRxDesc  = &RxDescList[NBR_OF_RX_DESC - 1];
    myFirstTxDesc = &TxDescList[0];
    myNextTxDesc  = &TxDescList[0];
    myLastTxDesc  = &TxDescList[NBR_OF_TX_DESC - 1];

    /* Register device */
    err = register_netdev(dev);
    if (err) {
        free_netdev(dev);
        return err;
    }

    /* set the default MAC address */

    e100_set_mac_address(dev, &default_mac);

    /* Initialize speed indicator stuff. */

    current_speed = 10;
    current_speed_selection = 0; /* Auto */
    speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
    speed_timer.data = (unsigned long)dev;
    speed_timer.function = e100_check_speed;

    clear_led_timer.function = e100_clear_network_leds;
    clear_led_timer.data = (unsigned long)dev;

    full_duplex = 0;
    current_duplex = autoneg;
    duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
        duplex_timer.data = (unsigned long)dev;
    duplex_timer.function = e100_check_duplex;

        /* Initialize mii interface */
    np->mii_if.phy_id_mask = 0x1f;
    np->mii_if.reg_num_mask = 0x1f;
    np->mii_if.dev = dev;
    np->mii_if.mdio_read = e100_get_mdio_reg;
    np->mii_if.mdio_write = e100_set_mdio_reg;

    /* Initialize group address registers to make sure that no */
    /* unwanted addresses are matched */
    *R_NETWORK_GA_0 = 0x00000000;
    *R_NETWORK_GA_1 = 0x00000000;

    /* Initialize next time the led can flash */
    led_next_time = jiffies;
    return 0;
}

/* set MAC address of the interface. called from the core after a
 * SIOCSIFADDR ioctl, and from the bootup above.
 */

static int
e100_set_mac_address(struct net_device *dev, void *p)
{
    struct net_local *np = netdev_priv(dev);
    struct sockaddr *addr = p;

    spin_lock(&np->lock); /* preemption protection */

    /* remember it */

    memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

    /* Write it to the hardware.
     * Note the way the address is wrapped:
     * *R_NETWORK_SA_0 = a0_0 | (a0_1 << 8) | (a0_2 << 16) | (a0_3 << 24);
     * *R_NETWORK_SA_1 = a0_4 | (a0_5 << 8);
     */

    *R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
        (dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
    *R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
    *R_NETWORK_SA_2 = 0;

    /* show it in the log as well */

    printk(KERN_INFO "%s: changed MAC to %pM\n", dev->name, dev->dev_addr);

    spin_unlock(&np->lock);

    return 0;
}

/*
 * Open/initialize the board. This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */

static int
e100_open(struct net_device *dev)
{
    unsigned long flags;

    /* enable the MDIO output pin */

    *R_NETWORK_MGM_CTRL = IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable);

    *R_IRQ_MASK0_CLR =
        IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
        IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
        IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);

    /* clear dma0 and 1 eop and descr irq masks */
    *R_IRQ_MASK2_CLR =
        IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);

    /* Reset and wait for the DMA channels */

    RESET_DMA(NETWORK_TX_DMA_NBR);
    RESET_DMA(NETWORK_RX_DMA_NBR);
    WAIT_DMA(NETWORK_TX_DMA_NBR);
    WAIT_DMA(NETWORK_RX_DMA_NBR);

    /* Initialise the etrax network controller */

    /* allocate the irq corresponding to the receiving DMA */

    if (request_irq(NETWORK_DMA_RX_IRQ_NBR, e100rxtx_interrupt, 0, cardname,
            (void *)dev)) {
        goto grace_exit0;
    }

    /* allocate the irq corresponding to the transmitting DMA */

    if (request_irq(NETWORK_DMA_TX_IRQ_NBR, e100rxtx_interrupt, 0,
            cardname, (void *)dev)) {
        goto grace_exit1;
    }

    /* allocate the irq corresponding to the network errors etc */

    if (request_irq(NETWORK_STATUS_IRQ_NBR, e100nw_interrupt, 0,
            cardname, (void *)dev)) {
        goto grace_exit2;
    }

    /*
     * Always allocate the DMA channels after the IRQ,
     * and clean up on failure.
     */

    if (cris_request_dma(NETWORK_TX_DMA_NBR,
                         cardname,
                         DMA_VERBOSE_ON_ERROR,
                         dma_eth)) {
        goto grace_exit3;
        }

    if (cris_request_dma(NETWORK_RX_DMA_NBR,
                         cardname,
                         DMA_VERBOSE_ON_ERROR,
                         dma_eth)) {
        goto grace_exit4;
        }

    /* give the HW an idea of what MAC address we want */

    *R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
        (dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
    *R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
    *R_NETWORK_SA_2 = 0;

#if 0
    /* use promiscuous mode for testing */
    *R_NETWORK_GA_0 = 0xffffffff;
    *R_NETWORK_GA_1 = 0xffffffff;

    *R_NETWORK_REC_CONFIG = 0xd; /* broadcast rec, individ. rec, ma0 enabled */
#else
    SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, max_size, size1522);
    SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, broadcast, receive);
    SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, ma0, enable);
    SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
    *R_NETWORK_REC_CONFIG = network_rec_config_shadow;
#endif

    *R_NETWORK_GEN_CONFIG =
        IO_STATE(R_NETWORK_GEN_CONFIG, phy,    mii_clk) |
        IO_STATE(R_NETWORK_GEN_CONFIG, enable, on);

    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, delay, none);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cancel, dont);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cd, enable);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, retry, enable);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, pad, enable);
    SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, crc, enable);
    *R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;

    local_irq_save(flags);

    /* enable the irq's for ethernet DMA */

    *R_IRQ_MASK2_SET =
        IO_STATE(R_IRQ_MASK2_SET, dma0_eop, set) |
        IO_STATE(R_IRQ_MASK2_SET, dma1_eop, set);

    *R_IRQ_MASK0_SET =
        IO_STATE(R_IRQ_MASK0_SET, overrun,       set) |
        IO_STATE(R_IRQ_MASK0_SET, underrun,      set) |
        IO_STATE(R_IRQ_MASK0_SET, excessive_col, set);

    /* make sure the irqs are cleared */

    *R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
    *R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);

    /* make sure the rec and transmit error counters are cleared */

    (void)*R_REC_COUNTERS;  /* dummy read */
    (void)*R_TR_COUNTERS;   /* dummy read */

    /* start the receiving DMA channel so we can receive packets from now on */

    *R_DMA_CH1_FIRST = virt_to_phys(myNextRxDesc);
    *R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, start);

    /* Set up transmit DMA channel so it can be restarted later */

    *R_DMA_CH0_FIRST = 0;
    *R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);
    netif_start_queue(dev);

    local_irq_restore(flags);

    /* Probe for transceiver */
    if (e100_probe_transceiver(dev))
        goto grace_exit5;

    /* Start duplex/speed timers */
    add_timer(&speed_timer);
    add_timer(&duplex_timer);

    /* We are now ready to accept transmit requeusts from
     * the queueing layer of the networking.
     */
    netif_carrier_on(dev);

    return 0;

grace_exit5:
    cris_free_dma(NETWORK_RX_DMA_NBR, cardname);
grace_exit4:
    cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
grace_exit3:
    free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);
grace_exit2:
    free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
grace_exit1:
    free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
grace_exit0:
    return -EAGAIN;
}

#if defined(CONFIG_ETRAX_NO_PHY)
static void
dummy_check_speed(struct net_device* dev)
{
    current_speed = 100;
}
#else
static void
generic_check_speed(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);
    if ((data & ADVERTISE_100FULL) ||
        (data & ADVERTISE_100HALF))
        current_speed = 100;
    else
        current_speed = 10;
}

static void
tdk_check_speed(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_TDK_DIAGNOSTIC_REG);
    current_speed = (data & MDIO_TDK_DIAGNOSTIC_RATE ? 100 : 10);
}

static void
broadcom_check_speed(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_AUX_CTRL_STATUS_REG);
    current_speed = (data & MDIO_BC_SPEED ? 100 : 10);
}

static void
intel_check_speed(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_INT_STATUS_REG_2);
    current_speed = (data & MDIO_INT_SPEED ? 100 : 10);
}
#endif
static void
e100_check_speed(unsigned long priv)
{
    struct net_device* dev = (struct net_device*)priv;
    struct net_local *np = netdev_priv(dev);
    static int led_initiated = 0;
    unsigned long data;
    int old_speed = current_speed;

    spin_lock(&np->transceiver_lock);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMSR);
    if (!(data & BMSR_LSTATUS)) {
        current_speed = 0;
    } else {
        transceiver->check_speed(dev);
    }

    spin_lock(&np->led_lock);
    if ((old_speed != current_speed) || !led_initiated) {
        led_initiated = 1;
        e100_set_network_leds(NO_NETWORK_ACTIVITY);
        if (current_speed)
            netif_carrier_on(dev);
        else
            netif_carrier_off(dev);
    }
    spin_unlock(&np->led_lock);

    /* Reinitialize the timer. */
    speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
    add_timer(&speed_timer);

    spin_unlock(&np->transceiver_lock);
}

static void
e100_negotiate(struct net_device* dev)
{
    struct net_local *np = netdev_priv(dev);
    unsigned short data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                        MII_ADVERTISE);

    /* Discard old speed and duplex settings */
    data &= ~(ADVERTISE_100HALF | ADVERTISE_100FULL |
              ADVERTISE_10HALF | ADVERTISE_10FULL);

    switch (current_speed_selection) {
        case 10:
            if (current_duplex == full)
                data |= ADVERTISE_10FULL;
            else if (current_duplex == half)
                data |= ADVERTISE_10HALF;
            else
                data |= ADVERTISE_10HALF | ADVERTISE_10FULL;
            break;

        case 100:
             if (current_duplex == full)
                data |= ADVERTISE_100FULL;
            else if (current_duplex == half)
                data |= ADVERTISE_100HALF;
            else
                data |= ADVERTISE_100HALF | ADVERTISE_100FULL;
            break;

        case 0: /* Auto */
             if (current_duplex == full)
                data |= ADVERTISE_100FULL | ADVERTISE_10FULL;
            else if (current_duplex == half)
                data |= ADVERTISE_100HALF | ADVERTISE_10HALF;
            else
                data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
                  ADVERTISE_100HALF | ADVERTISE_100FULL;
            break;

        default: /* assume autoneg speed and duplex */
            data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
                  ADVERTISE_100HALF | ADVERTISE_100FULL;
            break;
    }

    e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE, data);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);
    if (autoneg_normal) {
        /* Renegotiate with link partner */
        data |= BMCR_ANENABLE | BMCR_ANRESTART;
    } else {
        /* Don't negotiate speed or duplex */
        data &= ~(BMCR_ANENABLE | BMCR_ANRESTART);

        /* Set speed and duplex static */
        if (current_speed_selection == 10)
            data &= ~BMCR_SPEED100;
        else
            data |= BMCR_SPEED100;

        if (current_duplex != full)
            data &= ~BMCR_FULLDPLX;
        else
            data |= BMCR_FULLDPLX;
    }
    e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR, data);
}

static void
e100_set_speed(struct net_device* dev, unsigned long speed)
{
    struct net_local *np = netdev_priv(dev);

    spin_lock(&np->transceiver_lock);
    if (speed != current_speed_selection) {
        current_speed_selection = speed;
        e100_negotiate(dev);
    }
    spin_unlock(&np->transceiver_lock);
}

static void
e100_check_duplex(unsigned long priv)
{
    struct net_device *dev = (struct net_device *)priv;
    struct net_local *np = netdev_priv(dev);
    int old_duplex;

    spin_lock(&np->transceiver_lock);
    old_duplex = full_duplex;
    transceiver->check_duplex(dev);
    if (old_duplex != full_duplex) {
        /* Duplex changed */
        SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
        *R_NETWORK_REC_CONFIG = network_rec_config_shadow;
    }

    /* Reinitialize the timer. */
    duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
    add_timer(&duplex_timer);
    np->mii_if.full_duplex = full_duplex;
    spin_unlock(&np->transceiver_lock);
}
#if defined(CONFIG_ETRAX_NO_PHY)
static void
dummy_check_duplex(struct net_device* dev)
{
    full_duplex = 1;
}
#else
static void
generic_check_duplex(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);
    if ((data & ADVERTISE_10FULL) ||
        (data & ADVERTISE_100FULL))
        full_duplex = 1;
    else
        full_duplex = 0;
}

static void
tdk_check_duplex(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_TDK_DIAGNOSTIC_REG);
    full_duplex = (data & MDIO_TDK_DIAGNOSTIC_DPLX) ? 1 : 0;
}

static void
broadcom_check_duplex(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_AUX_CTRL_STATUS_REG);
    full_duplex = (data & MDIO_BC_FULL_DUPLEX_IND) ? 1 : 0;
}

static void
intel_check_duplex(struct net_device* dev)
{
    unsigned long data;
    struct net_local *np = netdev_priv(dev);

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
                 MDIO_INT_STATUS_REG_2);
    full_duplex = (data & MDIO_INT_FULL_DUPLEX_IND) ? 1 : 0;
}
#endif
static void
e100_set_duplex(struct net_device* dev, enum duplex new_duplex)
{
    struct net_local *np = netdev_priv(dev);

    spin_lock(&np->transceiver_lock);
    if (new_duplex != current_duplex) {
        current_duplex = new_duplex;
        e100_negotiate(dev);
    }
    spin_unlock(&np->transceiver_lock);
}

static int
e100_probe_transceiver(struct net_device* dev)
{
    int ret = 0;

#if !defined(CONFIG_ETRAX_NO_PHY)
    unsigned int phyid_high;
    unsigned int phyid_low;
    unsigned int oui;
    struct transceiver_ops* ops = NULL;
    struct net_local *np = netdev_priv(dev);

    spin_lock(&np->transceiver_lock);

    /* Probe MDIO physical address */
    for (np->mii_if.phy_id = 0; np->mii_if.phy_id <= 31;
         np->mii_if.phy_id++) {
        if (e100_get_mdio_reg(dev,
                      np->mii_if.phy_id, MII_BMSR) != 0xffff)
            break;
    }
    if (np->mii_if.phy_id == 32) {
        ret = -ENODEV;
        goto out;
    }

    /* Get manufacturer */
    phyid_high = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID1);
    phyid_low = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID2);
    oui = (phyid_high << 6) | (phyid_low >> 10);

    for (ops = &transceivers[0]; ops->oui; ops++) {
        if (ops->oui == oui)
            break;
    }
    transceiver = ops;
out:
    spin_unlock(&np->transceiver_lock);
#endif
    return ret;
}

static int
e100_get_mdio_reg(struct net_device *dev, int phy_id, int location)
{
    unsigned short cmd;    /* Data to be sent on MDIO port */
    int data;   /* Data read from MDIO */
    int bitCounter;

    /* Start of frame, OP Code, Physical Address, Register Address */
    cmd = (MDIO_START << 14) | (MDIO_READ << 12) | (phy_id << 7) |
        (location << 2);

    e100_send_mdio_cmd(cmd, 0);

    data = 0;

    /* Data... */
    for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
        data |= (e100_receive_mdio_bit() << bitCounter);
    }

    return data;
}

static void
e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value)
{
    int bitCounter;
    unsigned short cmd;

    cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (phy_id << 7) |
          (location << 2);

    e100_send_mdio_cmd(cmd, 1);

    /* Data... */
    for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
        e100_send_mdio_bit(GET_BIT(bitCounter, value));
    }

}

static void
e100_send_mdio_cmd(unsigned short cmd, int write_cmd)
{
    int bitCounter;
    unsigned char data = 0x2;

    /* Preamble */
    for (bitCounter = 31; bitCounter>= 0; bitCounter--)
        e100_send_mdio_bit(GET_BIT(bitCounter, MDIO_PREAMBLE));

    for (bitCounter = 15; bitCounter >= 2; bitCounter--)
        e100_send_mdio_bit(GET_BIT(bitCounter, cmd));

    /* Turnaround */
    for (bitCounter = 1; bitCounter >= 0 ; bitCounter--)
        if (write_cmd)
            e100_send_mdio_bit(GET_BIT(bitCounter, data));
        else
            e100_receive_mdio_bit();
}

static void
e100_send_mdio_bit(unsigned char bit)
{
    *R_NETWORK_MGM_CTRL =
        IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
        IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
    udelay(1);
    *R_NETWORK_MGM_CTRL =
        IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
        IO_MASK(R_NETWORK_MGM_CTRL, mdck) |
        IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
    udelay(1);
}

static unsigned char
e100_receive_mdio_bit(void)
{
    unsigned char bit;
    *R_NETWORK_MGM_CTRL = 0;
    bit = IO_EXTRACT(R_NETWORK_STAT, mdio, *R_NETWORK_STAT);
    udelay(1);
    *R_NETWORK_MGM_CTRL = IO_MASK(R_NETWORK_MGM_CTRL, mdck);
    udelay(1);
    return bit;
}

static void
e100_reset_transceiver(struct net_device* dev)
{
    struct net_local *np = netdev_priv(dev);
    unsigned short cmd;
    unsigned short data;
    int bitCounter;

    data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);

    cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (np->mii_if.phy_id << 7) | (MII_BMCR << 2);

    e100_send_mdio_cmd(cmd, 1);

    data |= 0x8000;

    for (bitCounter = 15; bitCounter >= 0 ; bitCounter--) {
        e100_send_mdio_bit(GET_BIT(bitCounter, data));
    }
}

/* Called by upper layers if they decide it took too long to complete
 * sending a packet - we need to reset and stuff.
 */

static void
e100_tx_timeout(struct net_device *dev)
{
    struct net_local *np = netdev_priv(dev);
    unsigned long flags;

    spin_lock_irqsave(&np->lock, flags);

    printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
           tx_done(dev) ? "IRQ problem" : "network cable problem");

    /* remember we got an error */

    dev->stats.tx_errors++;

    /* reset the TX DMA in case it has hung on something */

    RESET_DMA(NETWORK_TX_DMA_NBR);
    WAIT_DMA(NETWORK_TX_DMA_NBR);

    /* Reset the transceiver. */

    e100_reset_transceiver(dev);

    /* and get rid of the packets that never got an interrupt */
    while (myFirstTxDesc != myNextTxDesc) {
        dev_kfree_skb(myFirstTxDesc->skb);
        myFirstTxDesc->skb = 0;
        myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);
    }

    /* Set up transmit DMA channel so it can be restarted later */
    *R_DMA_CH0_FIRST = 0;
    *R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);

    /* tell the upper layers we're ok again */

    netif_wake_queue(dev);
    spin_unlock_irqrestore(&np->lock, flags);
}


/* This will only be invoked if the driver is _not_ in XOFF state.
 * What this means is that we need not check it, and that this
 * invariant will hold if we make sure that the netif_*_queue()
 * calls are done at the proper times.
 */

static int
e100_send_packet(struct sk_buff *skb, struct net_device *dev)
{
    struct net_local *np = netdev_priv(dev);
    unsigned char *buf = skb->data;
    unsigned long flags;

#ifdef ETHDEBUG
    printk("send packet len %d\n", length);
#endif
    spin_lock_irqsave(&np->lock, flags);  /* protect from tx_interrupt and ourself */

    myNextTxDesc->skb = skb;

    dev->trans_start = jiffies; /* NETIF_F_LLTX driver :( */

    e100_hardware_send_packet(np, buf, skb->len);

    myNextTxDesc = phys_to_virt(myNextTxDesc->descr.next);

    /* Stop queue if full */
    if (myNextTxDesc == myFirstTxDesc) {
        netif_stop_queue(dev);
    }

    spin_unlock_irqrestore(&np->lock, flags);

    return NETDEV_TX_OK;
}

/*
 * The typical workload of the driver:
 *   Handle the network interface interrupts.
 */

static irqreturn_t
e100rxtx_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = (struct net_device *)dev_id;
    unsigned long irqbits;

    /*
     * Note that both rx and tx interrupts are blocked at this point,
     * regardless of which got us here.
     */

    irqbits = *R_IRQ_MASK2_RD;

    /* Handle received packets */
    if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma1_eop, active)) {
        /* acknowledge the eop interrupt */

        *R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);

        /* check if one or more complete packets were indeed received */

        while ((*R_DMA_CH1_FIRST != virt_to_phys(myNextRxDesc)) &&
               (myNextRxDesc != myLastRxDesc)) {
            /* Take out the buffer and give it to the OS, then
             * allocate a new buffer to put a packet in.
             */
            e100_rx(dev);
            dev->stats.rx_packets++;
            /* restart/continue on the channel, for safety */
            *R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, restart);
            /* clear dma channel 1 eop/descr irq bits */
            *R_DMA_CH1_CLR_INTR =
                IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do) |
                IO_STATE(R_DMA_CH1_CLR_INTR, clr_descr, do);

            /* now, we might have gotten another packet
               so we have to loop back and check if so */
        }
    }

    /* Report any packets that have been sent */
    while (virt_to_phys(myFirstTxDesc) != *R_DMA_CH0_FIRST &&
           (netif_queue_stopped(dev) || myFirstTxDesc != myNextTxDesc)) {
        dev->stats.tx_bytes += myFirstTxDesc->skb->len;
        dev->stats.tx_packets++;

        /* dma is ready with the transmission of the data in tx_skb, so now
           we can release the skb memory */
        dev_kfree_skb_irq(myFirstTxDesc->skb);
        myFirstTxDesc->skb = 0;
        myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);
                /* Wake up queue. */
        netif_wake_queue(dev);
    }

    if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma0_eop, active)) {
        /* acknowledge the eop interrupt. */
        *R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
    }

    return IRQ_HANDLED;
}

static irqreturn_t
e100nw_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = (struct net_device *)dev_id;
    unsigned long irqbits = *R_IRQ_MASK0_RD;

    /* check for underrun irq */
    if (irqbits & IO_STATE(R_IRQ_MASK0_RD, underrun, active)) {
        SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
        *R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
        SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);
        dev->stats.tx_errors++;
        D(printk("ethernet receiver underrun!\n"));
    }

    /* check for overrun irq */
    if (irqbits & IO_STATE(R_IRQ_MASK0_RD, overrun, active)) {
        update_rx_stats(&dev->stats); /* this will ack the irq */
        D(printk("ethernet receiver overrun!\n"));
    }
    /* check for excessive collision irq */
    if (irqbits & IO_STATE(R_IRQ_MASK0_RD, excessive_col, active)) {
        SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
        *R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
        SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);
        dev->stats.tx_errors++;
        D(printk("ethernet excessive collisions!\n"));
    }
    return IRQ_HANDLED;
}

/* We have a good packet(s), get it/them out of the buffers. */
static void
e100_rx(struct net_device *dev)
{
    struct sk_buff *skb;
    int length = 0;
    struct net_local *np = netdev_priv(dev);
    unsigned char *skb_data_ptr;
#ifdef ETHDEBUG
    int i;
#endif
    etrax_eth_descr *prevRxDesc;  /* The descriptor right before myNextRxDesc */
    spin_lock(&np->led_lock);
    if (!led_active && time_after(jiffies, led_next_time)) {
        /* light the network leds depending on the current speed. */
        e100_set_network_leds(NETWORK_ACTIVITY);

        /* Set the earliest time we may clear the LED */
        led_next_time = jiffies + NET_FLASH_TIME;
        led_active = 1;
        mod_timer(&clear_led_timer, jiffies + HZ/10);
    }
    spin_unlock(&np->led_lock);

    length = myNextRxDesc->descr.hw_len - 4;
    dev->stats.rx_bytes += length;

#ifdef ETHDEBUG
    printk("Got a packet of length %d:\n", length);
    /* dump the first bytes in the packet */
    skb_data_ptr = (unsigned char *)phys_to_virt(myNextRxDesc->descr.buf);
    for (i = 0; i < 8; i++) {
        printk("%d: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n", i * 8,
               skb_data_ptr[0],skb_data_ptr[1],skb_data_ptr[2],skb_data_ptr[3],
               skb_data_ptr[4],skb_data_ptr[5],skb_data_ptr[6],skb_data_ptr[7]);
        skb_data_ptr += 8;
    }
#endif

    if (length < RX_COPYBREAK) {
        /* Small packet, copy data */
        skb = dev_alloc_skb(length - ETHER_HEAD_LEN);
        if (!skb) {
            dev->stats.rx_errors++;
            printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
            goto update_nextrxdesc;
        }

        skb_put(skb, length - ETHER_HEAD_LEN);        /* allocate room for the packet body */
        skb_data_ptr = skb_push(skb, ETHER_HEAD_LEN); /* allocate room for the header */

#ifdef ETHDEBUG
        printk("head = 0x%x, data = 0x%x, tail = 0x%x, end = 0x%x\n",
               skb->head, skb->data, skb_tail_pointer(skb),
               skb_end_pointer(skb));
        printk("copying packet to 0x%x.\n", skb_data_ptr);
#endif

        memcpy(skb_data_ptr, phys_to_virt(myNextRxDesc->descr.buf), length);
    }
    else {
        /* Large packet, send directly to upper layers and allocate new
         * memory (aligned to cache line boundary to avoid bug).
         * Before sending the skb to upper layers we must make sure
         * that skb->data points to the aligned start of the packet.
         */
        int align;
        struct sk_buff *new_skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
        if (!new_skb) {
            dev->stats.rx_errors++;
            printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
            goto update_nextrxdesc;
        }
        skb = myNextRxDesc->skb;
        align = (int)phys_to_virt(myNextRxDesc->descr.buf) - (int)skb->data;
        skb_put(skb, length + align);
        skb_pull(skb, align); /* Remove alignment bytes */
        myNextRxDesc->skb = new_skb;
        myNextRxDesc->descr.buf = L1_CACHE_ALIGN(virt_to_phys(myNextRxDesc->skb->data));
    }

    skb->protocol = eth_type_trans(skb, dev);

    /* Send the packet to the upper layers */
    netif_rx(skb);

  update_nextrxdesc:
    /* Prepare for next packet */
    myNextRxDesc->descr.status = 0;
    prevRxDesc = myNextRxDesc;
    myNextRxDesc = phys_to_virt(myNextRxDesc->descr.next);

    rx_queue_len++;

    /* Check if descriptors should be returned */
    if (rx_queue_len == RX_QUEUE_THRESHOLD) {
        flush_etrax_cache();
        prevRxDesc->descr.ctrl |= d_eol;
        myLastRxDesc->descr.ctrl &= ~d_eol;
        myLastRxDesc = prevRxDesc;
        rx_queue_len = 0;
    }
}

/* The inverse routine to net_open(). */
static int
e100_close(struct net_device *dev)
{
    printk(KERN_INFO "Closing %s.\n", dev->name);

    netif_stop_queue(dev);

    *R_IRQ_MASK0_CLR =
        IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
        IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
        IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);

    *R_IRQ_MASK2_CLR =
        IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
        IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);

    /* Stop the receiver and the transmitter */

    RESET_DMA(NETWORK_TX_DMA_NBR);
    RESET_DMA(NETWORK_RX_DMA_NBR);

    /* Flush the Tx and disable Rx here. */

    free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
    free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
    free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);

    cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
    cris_free_dma(NETWORK_RX_DMA_NBR, cardname);

    /* Update the statistics here. */

    update_rx_stats(&dev->stats);
    update_tx_stats(&dev->stats);

    /* Stop speed/duplex timers */
    del_timer(&speed_timer);
    del_timer(&duplex_timer);

    return 0;
}

static int
e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
    struct mii_ioctl_data *data = if_mii(ifr);
    struct net_local *np = netdev_priv(dev);
    int rc = 0;
        int old_autoneg;

    spin_lock(&np->lock); /* Preempt protection */
    switch (cmd) {
        /* The ioctls below should be considered obsolete but are */
        /* still present for compatibility with old scripts/apps  */
        case SET_ETH_SPEED_10:                  /* 10 Mbps */
            e100_set_speed(dev, 10);
            break;
        case SET_ETH_SPEED_100:                /* 100 Mbps */
            e100_set_speed(dev, 100);
            break;
        case SET_ETH_SPEED_AUTO:        /* Auto-negotiate speed */
            e100_set_speed(dev, 0);
            break;
        case SET_ETH_DUPLEX_HALF:       /* Half duplex */
            e100_set_duplex(dev, half);
            break;
        case SET_ETH_DUPLEX_FULL:       /* Full duplex */
            e100_set_duplex(dev, full);
            break;
        case SET_ETH_DUPLEX_AUTO:       /* Auto-negotiate duplex */
            e100_set_duplex(dev, autoneg);
            break;
            case SET_ETH_AUTONEG:
            old_autoneg = autoneg_normal;
                autoneg_normal = *(int*)data;
            if (autoneg_normal != old_autoneg)
                e100_negotiate(dev);
            break;
        default:
            rc = generic_mii_ioctl(&np->mii_if, if_mii(ifr),
                        cmd, NULL);
            break;
    }
    spin_unlock(&np->lock);
    return rc;
}

static int e100_get_settings(struct net_device *dev,
                 struct ethtool_cmd *cmd)
{
    struct net_local *np = netdev_priv(dev);
    int err;

    spin_lock_irq(&np->lock);
    err = mii_ethtool_gset(&np->mii_if, cmd);
    spin_unlock_irq(&np->lock);

    /* The PHY may support 1000baseT, but the Etrax100 does not.  */
    cmd->supported &= ~(SUPPORTED_1000baseT_Half
                | SUPPORTED_1000baseT_Full);
    return err;
}

static int e100_set_settings(struct net_device *dev,
                 struct ethtool_cmd *ecmd)
{
    if (ecmd->autoneg == AUTONEG_ENABLE) {
        e100_set_duplex(dev, autoneg);
        e100_set_speed(dev, 0);
    } else {
        e100_set_duplex(dev, ecmd->duplex == DUPLEX_HALF ? half : full);
        e100_set_speed(dev, ecmd->speed == SPEED_10 ? 10: 100);
    }

    return 0;
}

static void e100_get_drvinfo(struct net_device *dev,
                 struct ethtool_drvinfo *info)
{
    strncpy(info->driver, "ETRAX 100LX", sizeof(info->driver) - 1);
    strncpy(info->version, "$Revision: 1.31 $", sizeof(info->version) - 1);
    strncpy(info->fw_version, "N/A", sizeof(info->fw_version) - 1);
    strncpy(info->bus_info, "N/A", sizeof(info->bus_info) - 1);
}

static int e100_nway_reset(struct net_device *dev)
{
    if (current_duplex == autoneg && current_speed_selection == 0)
        e100_negotiate(dev);
    return 0;
}

static const struct ethtool_ops e100_ethtool_ops = {
    .get_settings   = e100_get_settings,
    .set_settings   = e100_set_settings,
    .get_drvinfo    = e100_get_drvinfo,
    .nway_reset = e100_nway_reset,
    .get_link   = ethtool_op_get_link,
};

static int
e100_set_config(struct net_device *dev, struct ifmap *map)
{
    struct net_local *np = netdev_priv(dev);

    spin_lock(&np->lock); /* Preempt protection */

    switch(map->port) {
        case IF_PORT_UNKNOWN:
            /* Use autoneg */
            e100_set_speed(dev, 0);
            e100_set_duplex(dev, autoneg);
            break;
        case IF_PORT_10BASET:
            e100_set_speed(dev, 10);
            e100_set_duplex(dev, autoneg);
            break;
        case IF_PORT_100BASET:
        case IF_PORT_100BASETX:
            e100_set_speed(dev, 100);
            e100_set_duplex(dev, autoneg);
            break;
        case IF_PORT_100BASEFX:
        case IF_PORT_10BASE2:
        case IF_PORT_AUI:
            spin_unlock(&np->lock);
            return -EOPNOTSUPP;
            break;
        default:
            printk(KERN_ERR "%s: Invalid media selected", dev->name);
            spin_unlock(&np->lock);
            return -EINVAL;
    }
    spin_unlock(&np->lock);
    return 0;
}

static void
update_rx_stats(struct net_device_stats *es)
{
    unsigned long r = *R_REC_COUNTERS;
    /* update stats relevant to reception errors */
    es->rx_fifo_errors += IO_EXTRACT(R_REC_COUNTERS, congestion, r);
    es->rx_crc_errors += IO_EXTRACT(R_REC_COUNTERS, crc_error, r);
    es->rx_frame_errors += IO_EXTRACT(R_REC_COUNTERS, alignment_error, r);
    es->rx_length_errors += IO_EXTRACT(R_REC_COUNTERS, oversize, r);
}

static void
update_tx_stats(struct net_device_stats *es)
{
    unsigned long r = *R_TR_COUNTERS;
    /* update stats relevant to transmission errors */
    es->collisions +=
        IO_EXTRACT(R_TR_COUNTERS, single_col, r) +
        IO_EXTRACT(R_TR_COUNTERS, multiple_col, r);
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *
e100_get_stats(struct net_device *dev)
{
    struct net_local *lp = netdev_priv(dev);
    unsigned long flags;

    spin_lock_irqsave(&lp->lock, flags);

    update_rx_stats(&dev->stats);
    update_tx_stats(&dev->stats);

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

/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1  Promiscuous mode, receive all packets
 * num_addrs == 0   Normal mode, clear multicast list
 * num_addrs > 0    Multicast mode, receive normal and MC packets,
 *          and do best-effort filtering.
 */
static void
set_multicast_list(struct net_device *dev)
{
    struct net_local *lp = netdev_priv(dev);
    int num_addr = netdev_mc_count(dev);
    unsigned long int lo_bits;
    unsigned long int hi_bits;

    spin_lock(&lp->lock);
    if (dev->flags & IFF_PROMISC) {
        /* promiscuous mode */
        lo_bits = 0xfffffffful;
        hi_bits = 0xfffffffful;

        /* Enable individual receive */
        SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, receive);
        *R_NETWORK_REC_CONFIG = network_rec_config_shadow;
    } else if (dev->flags & IFF_ALLMULTI) {
        /* enable all multicasts */
        lo_bits = 0xfffffffful;
        hi_bits = 0xfffffffful;

        /* Disable individual receive */
        SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
        *R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
    } else if (num_addr == 0) {
        /* Normal, clear the mc list */
        lo_bits = 0x00000000ul;
        hi_bits = 0x00000000ul;

        /* Disable individual receive */
        SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
        *R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
    } else {
        /* MC mode, receive normal and MC packets */
        char hash_ix;
        struct netdev_hw_addr *ha;
        char *baddr;

        lo_bits = 0x00000000ul;
        hi_bits = 0x00000000ul;
        netdev_for_each_mc_addr(ha, dev) {
            /* Calculate the hash index for the GA registers */

            hash_ix = 0;
            baddr = ha->addr;
            hash_ix ^= (*baddr) & 0x3f;
            hash_ix ^= ((*baddr) >> 6) & 0x03;
            ++baddr;
            hash_ix ^= ((*baddr) << 2) & 0x03c;
            hash_ix ^= ((*baddr) >> 4) & 0xf;
            ++baddr;
            hash_ix ^= ((*baddr) << 4) & 0x30;
            hash_ix ^= ((*baddr) >> 2) & 0x3f;
            ++baddr;
            hash_ix ^= (*baddr) & 0x3f;
            hash_ix ^= ((*baddr) >> 6) & 0x03;
            ++baddr;
            hash_ix ^= ((*baddr) << 2) & 0x03c;
            hash_ix ^= ((*baddr) >> 4) & 0xf;
            ++baddr;
            hash_ix ^= ((*baddr) << 4) & 0x30;
            hash_ix ^= ((*baddr) >> 2) & 0x3f;

            hash_ix &= 0x3f;

            if (hash_ix >= 32) {
                hi_bits |= (1 << (hash_ix-32));
            } else {
                lo_bits |= (1 << hash_ix);
            }
        }
        /* Disable individual receive */
        SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
        *R_NETWORK_REC_CONFIG = network_rec_config_shadow;
    }
    *R_NETWORK_GA_0 = lo_bits;
    *R_NETWORK_GA_1 = hi_bits;
    spin_unlock(&lp->lock);
}

void
e100_hardware_send_packet(struct net_local *np, char *buf, int length)
{
    D(printk("e100 send pack, buf 0x%x len %d\n", buf, length));

    spin_lock(&np->led_lock);
    if (!led_active && time_after(jiffies, led_next_time)) {
        /* light the network leds depending on the current speed. */
        e100_set_network_leds(NETWORK_ACTIVITY);

        /* Set the earliest time we may clear the LED */
        led_next_time = jiffies + NET_FLASH_TIME;
        led_active = 1;
        mod_timer(&clear_led_timer, jiffies + HZ/10);
    }
    spin_unlock(&np->led_lock);

    /* configure the tx dma descriptor */
    myNextTxDesc->descr.sw_len = length;
    myNextTxDesc->descr.ctrl = d_eop | d_eol | d_wait;
    myNextTxDesc->descr.buf = virt_to_phys(buf);

        /* Move end of list */
        myLastTxDesc->descr.ctrl &= ~d_eol;
        myLastTxDesc = myNextTxDesc;

    /* Restart DMA channel */
    *R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, restart);
}

static void
e100_clear_network_leds(unsigned long dummy)
{
    struct net_device *dev = (struct net_device *)dummy;
    struct net_local *np = netdev_priv(dev);

    spin_lock(&np->led_lock);

    if (led_active && time_after(jiffies, led_next_time)) {
        e100_set_network_leds(NO_NETWORK_ACTIVITY);

        /* Set the earliest time we may set the LED */
        led_next_time = jiffies + NET_FLASH_PAUSE;
        led_active = 0;
    }

    spin_unlock(&np->led_lock);
}

static void
e100_set_network_leds(int active)
{
#if defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK)
    int light_leds = (active == NO_NETWORK_ACTIVITY);
#elif defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY)
    int light_leds = (active == NETWORK_ACTIVITY);
#else
#error "Define either CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK or CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY"
#endif

    if (!current_speed) {
        /* Make LED red, link is down */
        CRIS_LED_NETWORK_SET(CRIS_LED_OFF);
    } else if (light_leds) {
        if (current_speed == 10) {
            CRIS_LED_NETWORK_SET(CRIS_LED_ORANGE);
        } else {
            CRIS_LED_NETWORK_SET(CRIS_LED_GREEN);
        }
    } else {
        CRIS_LED_NETWORK_SET(CRIS_LED_OFF);
    }
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void
e100_netpoll(struct net_device* netdev)
{
    e100rxtx_interrupt(NETWORK_DMA_TX_IRQ_NBR, netdev);
}
#endif

static int
etrax_init_module(void)
{
    return etrax_ethernet_init();
}

static int __init
e100_boot_setup(char* str)
{
    struct sockaddr sa = {0};
    int i;

    /* Parse the colon separated Ethernet station address */
    for (i = 0; i <  ETH_ALEN; i++) {
        unsigned int tmp;
        if (sscanf(str + 3*i, "%2x", &tmp) != 1) {
            printk(KERN_WARNING "Malformed station address");
            return 0;
        }
        sa.sa_data[i] = (char)tmp;
    }

    default_mac = sa;
    return 1;
}

__setup("etrax100_eth=", e100_boot_setup);

module_init(etrax_init_module);