dl2k.c

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/*  D-Link DL2000-based Gigabit Ethernet Adapter Linux driver */
/*
    Copyright (c) 2001, 2002 by D-Link Corporation
    Written by Edward Peng.<[email protected]>
    Created 03-May-2001, base on Linux' sundance.c.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
*/

#define DRV_NAME    "DL2000/TC902x-based linux driver"
#define DRV_VERSION "v1.19"
#define DRV_RELDATE "2007/08/12"
#include "dl2k.h"
#include <linux/dma-mapping.h>

#define dw32(reg, val)  iowrite32(val, ioaddr + (reg))
#define dw16(reg, val)  iowrite16(val, ioaddr + (reg))
#define dw8(reg, val)   iowrite8(val, ioaddr + (reg))
#define dr32(reg)   ioread32(ioaddr + (reg))
#define dr16(reg)   ioread16(ioaddr + (reg))
#define dr8(reg)    ioread8(ioaddr + (reg))

static char version[] __devinitdata =
      KERN_INFO DRV_NAME " " DRV_VERSION " " DRV_RELDATE "\n";
#define MAX_UNITS 8
static int mtu[MAX_UNITS];
static int vlan[MAX_UNITS];
static int jumbo[MAX_UNITS];
static char *media[MAX_UNITS];
static int tx_flow=-1;
static int rx_flow=-1;
static int copy_thresh;
static int rx_coalesce=10;  /* Rx frame count each interrupt */
static int rx_timeout=200;  /* Rx DMA wait time in 640ns increments */
static int tx_coalesce=16;  /* HW xmit count each TxDMAComplete */


MODULE_AUTHOR ("Edward Peng");
MODULE_DESCRIPTION ("D-Link DL2000-based Gigabit Ethernet Adapter");
MODULE_LICENSE("GPL");
module_param_array(mtu, int, NULL, 0);
module_param_array(media, charp, NULL, 0);
module_param_array(vlan, int, NULL, 0);
module_param_array(jumbo, int, NULL, 0);
module_param(tx_flow, int, 0);
module_param(rx_flow, int, 0);
module_param(copy_thresh, int, 0);
module_param(rx_coalesce, int, 0);  /* Rx frame count each interrupt */
module_param(rx_timeout, int, 0);   /* Rx DMA wait time in 64ns increments */
module_param(tx_coalesce, int, 0); /* HW xmit count each TxDMAComplete */


/* Enable the default interrupts */
#define DEFAULT_INTR (RxDMAComplete | HostError | IntRequested | TxDMAComplete| \
       UpdateStats | LinkEvent)

static void dl2k_enable_int(struct netdev_private *np)
{
    void __iomem *ioaddr = np->ioaddr;

    dw16(IntEnable, DEFAULT_INTR);
}

static const int max_intrloop = 50;
static const int multicast_filter_limit = 0x40;

static int rio_open (struct net_device *dev);
static void rio_timer (unsigned long data);
static void rio_tx_timeout (struct net_device *dev);
static void alloc_list (struct net_device *dev);
static netdev_tx_t start_xmit (struct sk_buff *skb, struct net_device *dev);
static irqreturn_t rio_interrupt (int irq, void *dev_instance);
static void rio_free_tx (struct net_device *dev, int irq);
static void tx_error (struct net_device *dev, int tx_status);
static int receive_packet (struct net_device *dev);
static void rio_error (struct net_device *dev, int int_status);
static int change_mtu (struct net_device *dev, int new_mtu);
static void set_multicast (struct net_device *dev);
static struct net_device_stats *get_stats (struct net_device *dev);
static int clear_stats (struct net_device *dev);
static int rio_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
static int rio_close (struct net_device *dev);
static int find_miiphy (struct net_device *dev);
static int parse_eeprom (struct net_device *dev);
static int read_eeprom (struct netdev_private *, int eep_addr);
static int mii_wait_link (struct net_device *dev, int wait);
static int mii_set_media (struct net_device *dev);
static int mii_get_media (struct net_device *dev);
static int mii_set_media_pcs (struct net_device *dev);
static int mii_get_media_pcs (struct net_device *dev);
static int mii_read (struct net_device *dev, int phy_addr, int reg_num);
static int mii_write (struct net_device *dev, int phy_addr, int reg_num,
              u16 data);

static const struct ethtool_ops ethtool_ops;

static const struct net_device_ops netdev_ops = {
    .ndo_open       = rio_open,
    .ndo_start_xmit = start_xmit,
    .ndo_stop       = rio_close,
    .ndo_get_stats      = get_stats,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_set_rx_mode    = set_multicast,
    .ndo_do_ioctl       = rio_ioctl,
    .ndo_tx_timeout     = rio_tx_timeout,
    .ndo_change_mtu     = change_mtu,
};

static int __devinit
rio_probe1 (struct pci_dev *pdev, const struct pci_device_id *ent)
{
    struct net_device *dev;
    struct netdev_private *np;
    static int card_idx;
    int chip_idx = ent->driver_data;
    int err, irq;
    void __iomem *ioaddr;
    static int version_printed;
    void *ring_space;
    dma_addr_t ring_dma;

    if (!version_printed++)
        printk ("%s", version);

    err = pci_enable_device (pdev);
    if (err)
        return err;

    irq = pdev->irq;
    err = pci_request_regions (pdev, "dl2k");
    if (err)
        goto err_out_disable;

    pci_set_master (pdev);

    err = -ENOMEM;

    dev = alloc_etherdev (sizeof (*np));
    if (!dev)
        goto err_out_res;
    SET_NETDEV_DEV(dev, &pdev->dev);

    np = netdev_priv(dev);

    /* IO registers range. */
    ioaddr = pci_iomap(pdev, 0, 0);
    if (!ioaddr)
        goto err_out_dev;
    np->eeprom_addr = ioaddr;

#ifdef MEM_MAPPING
    /* MM registers range. */
    ioaddr = pci_iomap(pdev, 1, 0);
    if (!ioaddr)
        goto err_out_iounmap;
#endif
    np->ioaddr = ioaddr;
    np->chip_id = chip_idx;
    np->pdev = pdev;
    spin_lock_init (&np->tx_lock);
    spin_lock_init (&np->rx_lock);

    /* Parse manual configuration */
    np->an_enable = 1;
    np->tx_coalesce = 1;
    if (card_idx < MAX_UNITS) {
        if (media[card_idx] != NULL) {
            np->an_enable = 0;
            if (strcmp (media[card_idx], "auto") == 0 ||
                strcmp (media[card_idx], "autosense") == 0 ||
                strcmp (media[card_idx], "0") == 0 ) {
                np->an_enable = 2;
            } else if (strcmp (media[card_idx], "100mbps_fd") == 0 ||
                strcmp (media[card_idx], "4") == 0) {
                np->speed = 100;
                np->full_duplex = 1;
            } else if (strcmp (media[card_idx], "100mbps_hd") == 0 ||
                   strcmp (media[card_idx], "3") == 0) {
                np->speed = 100;
                np->full_duplex = 0;
            } else if (strcmp (media[card_idx], "10mbps_fd") == 0 ||
                   strcmp (media[card_idx], "2") == 0) {
                np->speed = 10;
                np->full_duplex = 1;
            } else if (strcmp (media[card_idx], "10mbps_hd") == 0 ||
                   strcmp (media[card_idx], "1") == 0) {
                np->speed = 10;
                np->full_duplex = 0;
            } else if (strcmp (media[card_idx], "1000mbps_fd") == 0 ||
                 strcmp (media[card_idx], "6") == 0) {
                np->speed=1000;
                np->full_duplex=1;
            } else if (strcmp (media[card_idx], "1000mbps_hd") == 0 ||
                 strcmp (media[card_idx], "5") == 0) {
                np->speed = 1000;
                np->full_duplex = 0;
            } else {
                np->an_enable = 1;
            }
        }
        if (jumbo[card_idx] != 0) {
            np->jumbo = 1;
            dev->mtu = MAX_JUMBO;
        } else {
            np->jumbo = 0;
            if (mtu[card_idx] > 0 && mtu[card_idx] < PACKET_SIZE)
                dev->mtu = mtu[card_idx];
        }
        np->vlan = (vlan[card_idx] > 0 && vlan[card_idx] < 4096) ?
            vlan[card_idx] : 0;
        if (rx_coalesce > 0 && rx_timeout > 0) {
            np->rx_coalesce = rx_coalesce;
            np->rx_timeout = rx_timeout;
            np->coalesce = 1;
        }
        np->tx_flow = (tx_flow == 0) ? 0 : 1;
        np->rx_flow = (rx_flow == 0) ? 0 : 1;

        if (tx_coalesce < 1)
            tx_coalesce = 1;
        else if (tx_coalesce > TX_RING_SIZE-1)
            tx_coalesce = TX_RING_SIZE - 1;
    }
    dev->netdev_ops = &netdev_ops;
    dev->watchdog_timeo = TX_TIMEOUT;
    SET_ETHTOOL_OPS(dev, &ethtool_ops);
#if 0
    dev->features = NETIF_F_IP_CSUM;
#endif
    pci_set_drvdata (pdev, dev);

    ring_space = pci_alloc_consistent (pdev, TX_TOTAL_SIZE, &ring_dma);
    if (!ring_space)
        goto err_out_iounmap;
    np->tx_ring = ring_space;
    np->tx_ring_dma = ring_dma;

    ring_space = pci_alloc_consistent (pdev, RX_TOTAL_SIZE, &ring_dma);
    if (!ring_space)
        goto err_out_unmap_tx;
    np->rx_ring = ring_space;
    np->rx_ring_dma = ring_dma;

    /* Parse eeprom data */
    parse_eeprom (dev);

    /* Find PHY address */
    err = find_miiphy (dev);
    if (err)
        goto err_out_unmap_rx;

    /* Fiber device? */
    np->phy_media = (dr16(ASICCtrl) & PhyMedia) ? 1 : 0;
    np->link_status = 0;
    /* Set media and reset PHY */
    if (np->phy_media) {
        /* default Auto-Negotiation for fiber deivices */
        if (np->an_enable == 2) {
            np->an_enable = 1;
        }
        mii_set_media_pcs (dev);
    } else {
        /* Auto-Negotiation is mandatory for 1000BASE-T,
           IEEE 802.3ab Annex 28D page 14 */
        if (np->speed == 1000)
            np->an_enable = 1;
        mii_set_media (dev);
    }

    err = register_netdev (dev);
    if (err)
        goto err_out_unmap_rx;

    card_idx++;

    printk (KERN_INFO "%s: %s, %pM, IRQ %d\n",
        dev->name, np->name, dev->dev_addr, irq);
    if (tx_coalesce > 1)
        printk(KERN_INFO "tx_coalesce:\t%d packets\n",
                tx_coalesce);
    if (np->coalesce)
        printk(KERN_INFO
               "rx_coalesce:\t%d packets\n"
               "rx_timeout: \t%d ns\n",
                np->rx_coalesce, np->rx_timeout*640);
    if (np->vlan)
        printk(KERN_INFO "vlan(id):\t%d\n", np->vlan);
    return 0;

err_out_unmap_rx:
    pci_free_consistent (pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
err_out_unmap_tx:
    pci_free_consistent (pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
err_out_iounmap:
#ifdef MEM_MAPPING
    pci_iounmap(pdev, np->ioaddr);
#endif
    pci_iounmap(pdev, np->eeprom_addr);
err_out_dev:
    free_netdev (dev);
err_out_res:
    pci_release_regions (pdev);
err_out_disable:
    pci_disable_device (pdev);
    return err;
}

static int
find_miiphy (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    int i, phy_found = 0;
    np = netdev_priv(dev);
    np->phy_addr = 1;

    for (i = 31; i >= 0; i--) {
        int mii_status = mii_read (dev, i, 1);
        if (mii_status != 0xffff && mii_status != 0x0000) {
            np->phy_addr = i;
            phy_found++;
        }
    }
    if (!phy_found) {
        printk (KERN_ERR "%s: No MII PHY found!\n", dev->name);
        return -ENODEV;
    }
    return 0;
}

static int
parse_eeprom (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    int i, j;
    u8 sromdata[256];
    u8 *psib;
    u32 crc;
    PSROM_t psrom = (PSROM_t) sromdata;

    int cid, next;

    for (i = 0; i < 128; i++)
        ((__le16 *) sromdata)[i] = cpu_to_le16(read_eeprom(np, i));

    if (np->pdev->vendor == PCI_VENDOR_ID_DLINK) {  /* D-Link Only */
        /* Check CRC */
        crc = ~ether_crc_le (256 - 4, sromdata);
        if (psrom->crc != cpu_to_le32(crc)) {
            printk (KERN_ERR "%s: EEPROM data CRC error.\n",
                    dev->name);
            return -1;
        }
    }

    /* Set MAC address */
    for (i = 0; i < 6; i++)
        dev->dev_addr[i] = psrom->mac_addr[i];

    if (np->pdev->vendor != PCI_VENDOR_ID_DLINK) {
        return 0;
    }

    /* Parse Software Information Block */
    i = 0x30;
    psib = (u8 *) sromdata;
    do {
        cid = psib[i++];
        next = psib[i++];
        if ((cid == 0 && next == 0) || (cid == 0xff && next == 0xff)) {
            printk (KERN_ERR "Cell data error\n");
            return -1;
        }
        switch (cid) {
        case 0: /* Format version */
            break;
        case 1: /* End of cell */
            return 0;
        case 2: /* Duplex Polarity */
            np->duplex_polarity = psib[i];
            dw8(PhyCtrl, dr8(PhyCtrl) | psib[i]);
            break;
        case 3: /* Wake Polarity */
            np->wake_polarity = psib[i];
            break;
        case 9: /* Adapter description */
            j = (next - i > 255) ? 255 : next - i;
            memcpy (np->name, &(psib[i]), j);
            break;
        case 4:
        case 5:
        case 6:
        case 7:
        case 8: /* Reversed */
            break;
        default:    /* Unknown cell */
            return -1;
        }
        i = next;
    } while (1);

    return 0;
}

static int
rio_open (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    const int irq = np->pdev->irq;
    int i;
    u16 macctrl;

    i = request_irq(irq, rio_interrupt, IRQF_SHARED, dev->name, dev);
    if (i)
        return i;

    /* Reset all logic functions */
    dw16(ASICCtrl + 2,
         GlobalReset | DMAReset | FIFOReset | NetworkReset | HostReset);
    mdelay(10);

    /* DebugCtrl bit 4, 5, 9 must set */
    dw32(DebugCtrl, dr32(DebugCtrl) | 0x0230);

    /* Jumbo frame */
    if (np->jumbo != 0)
        dw16(MaxFrameSize, MAX_JUMBO+14);

    alloc_list (dev);

    /* Get station address */
    for (i = 0; i < 6; i++)
        dw8(StationAddr0 + i, dev->dev_addr[i]);

    set_multicast (dev);
    if (np->coalesce) {
        dw32(RxDMAIntCtrl, np->rx_coalesce | np->rx_timeout << 16);
    }
    /* Set RIO to poll every N*320nsec. */
    dw8(RxDMAPollPeriod, 0x20);
    dw8(TxDMAPollPeriod, 0xff);
    dw8(RxDMABurstThresh, 0x30);
    dw8(RxDMAUrgentThresh, 0x30);
    dw32(RmonStatMask, 0x0007ffff);
    /* clear statistics */
    clear_stats (dev);

    /* VLAN supported */
    if (np->vlan) {
        /* priority field in RxDMAIntCtrl  */
        dw32(RxDMAIntCtrl, dr32(RxDMAIntCtrl) | 0x7 << 10);
        /* VLANId */
        dw16(VLANId, np->vlan);
        /* Length/Type should be 0x8100 */
        dw32(VLANTag, 0x8100 << 16 | np->vlan);
        /* Enable AutoVLANuntagging, but disable AutoVLANtagging.
           VLAN information tagged by TFC' VID, CFI fields. */
        dw32(MACCtrl, dr32(MACCtrl) | AutoVLANuntagging);
    }

    init_timer (&np->timer);
    np->timer.expires = jiffies + 1*HZ;
    np->timer.data = (unsigned long) dev;
    np->timer.function = rio_timer;
    add_timer (&np->timer);

    /* Start Tx/Rx */
    dw32(MACCtrl, dr32(MACCtrl) | StatsEnable | RxEnable | TxEnable);

    macctrl = 0;
    macctrl |= (np->vlan) ? AutoVLANuntagging : 0;
    macctrl |= (np->full_duplex) ? DuplexSelect : 0;
    macctrl |= (np->tx_flow) ? TxFlowControlEnable : 0;
    macctrl |= (np->rx_flow) ? RxFlowControlEnable : 0;
    dw16(MACCtrl, macctrl);

    netif_start_queue (dev);

    dl2k_enable_int(np);
    return 0;
}

static void
rio_timer (unsigned long data)
{
    struct net_device *dev = (struct net_device *)data;
    struct netdev_private *np = netdev_priv(dev);
    unsigned int entry;
    int next_tick = 1*HZ;
    unsigned long flags;

    spin_lock_irqsave(&np->rx_lock, flags);
    /* Recover rx ring exhausted error */
    if (np->cur_rx - np->old_rx >= RX_RING_SIZE) {
        printk(KERN_INFO "Try to recover rx ring exhausted...\n");
        /* Re-allocate skbuffs to fill the descriptor ring */
        for (; np->cur_rx - np->old_rx > 0; np->old_rx++) {
            struct sk_buff *skb;
            entry = np->old_rx % RX_RING_SIZE;
            /* Dropped packets don't need to re-allocate */
            if (np->rx_skbuff[entry] == NULL) {
                skb = netdev_alloc_skb_ip_align(dev,
                                np->rx_buf_sz);
                if (skb == NULL) {
                    np->rx_ring[entry].fraginfo = 0;
                    printk (KERN_INFO
                        "%s: Still unable to re-allocate Rx skbuff.#%d\n",
                        dev->name, entry);
                    break;
                }
                np->rx_skbuff[entry] = skb;
                np->rx_ring[entry].fraginfo =
                    cpu_to_le64 (pci_map_single
                     (np->pdev, skb->data, np->rx_buf_sz,
                      PCI_DMA_FROMDEVICE));
            }
            np->rx_ring[entry].fraginfo |=
                cpu_to_le64((u64)np->rx_buf_sz << 48);
            np->rx_ring[entry].status = 0;
        } /* end for */
    } /* end if */
    spin_unlock_irqrestore (&np->rx_lock, flags);
    np->timer.expires = jiffies + next_tick;
    add_timer(&np->timer);
}

static void
rio_tx_timeout (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;

    printk (KERN_INFO "%s: Tx timed out (%4.4x), is buffer full?\n",
        dev->name, dr32(TxStatus));
    rio_free_tx(dev, 0);
    dev->if_port = 0;
    dev->trans_start = jiffies; /* prevent tx timeout */
}

 /* allocate and initialize Tx and Rx descriptors */
static void
alloc_list (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    int i;

    np->cur_rx = np->cur_tx = 0;
    np->old_rx = np->old_tx = 0;
    np->rx_buf_sz = (dev->mtu <= 1500 ? PACKET_SIZE : dev->mtu + 32);

    /* Initialize Tx descriptors, TFDListPtr leaves in start_xmit(). */
    for (i = 0; i < TX_RING_SIZE; i++) {
        np->tx_skbuff[i] = NULL;
        np->tx_ring[i].status = cpu_to_le64 (TFDDone);
        np->tx_ring[i].next_desc = cpu_to_le64 (np->tx_ring_dma +
                          ((i+1)%TX_RING_SIZE) *
                          sizeof (struct netdev_desc));
    }

    /* Initialize Rx descriptors */
    for (i = 0; i < RX_RING_SIZE; i++) {
        np->rx_ring[i].next_desc = cpu_to_le64 (np->rx_ring_dma +
                        ((i + 1) % RX_RING_SIZE) *
                        sizeof (struct netdev_desc));
        np->rx_ring[i].status = 0;
        np->rx_ring[i].fraginfo = 0;
        np->rx_skbuff[i] = NULL;
    }

    /* Allocate the rx buffers */
    for (i = 0; i < RX_RING_SIZE; i++) {
        /* Allocated fixed size of skbuff */
        struct sk_buff *skb;

        skb = netdev_alloc_skb_ip_align(dev, np->rx_buf_sz);
        np->rx_skbuff[i] = skb;
        if (skb == NULL) {
            printk (KERN_ERR
                "%s: alloc_list: allocate Rx buffer error! ",
                dev->name);
            break;
        }
        /* Rubicon now supports 40 bits of addressing space. */
        np->rx_ring[i].fraginfo =
            cpu_to_le64 ( pci_map_single (
                  np->pdev, skb->data, np->rx_buf_sz,
                  PCI_DMA_FROMDEVICE));
        np->rx_ring[i].fraginfo |= cpu_to_le64((u64)np->rx_buf_sz << 48);
    }

    /* Set RFDListPtr */
    dw32(RFDListPtr0, np->rx_ring_dma);
    dw32(RFDListPtr1, 0);
}

static netdev_tx_t
start_xmit (struct sk_buff *skb, struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    struct netdev_desc *txdesc;
    unsigned entry;
    u64 tfc_vlan_tag = 0;

    if (np->link_status == 0) { /* Link Down */
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
    }
    entry = np->cur_tx % TX_RING_SIZE;
    np->tx_skbuff[entry] = skb;
    txdesc = &np->tx_ring[entry];

#if 0
    if (skb->ip_summed == CHECKSUM_PARTIAL) {
        txdesc->status |=
            cpu_to_le64 (TCPChecksumEnable | UDPChecksumEnable |
                 IPChecksumEnable);
    }
#endif
    if (np->vlan) {
        tfc_vlan_tag = VLANTagInsert |
            ((u64)np->vlan << 32) |
            ((u64)skb->priority << 45);
    }
    txdesc->fraginfo = cpu_to_le64 (pci_map_single (np->pdev, skb->data,
                            skb->len,
                            PCI_DMA_TODEVICE));
    txdesc->fraginfo |= cpu_to_le64((u64)skb->len << 48);

    /* DL2K bug: DMA fails to get next descriptor ptr in 10Mbps mode
     * Work around: Always use 1 descriptor in 10Mbps mode */
    if (entry % np->tx_coalesce == 0 || np->speed == 10)
        txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag |
                          WordAlignDisable |
                          TxDMAIndicate |
                          (1 << FragCountShift));
    else
        txdesc->status = cpu_to_le64 (entry | tfc_vlan_tag |
                          WordAlignDisable |
                          (1 << FragCountShift));

    /* TxDMAPollNow */
    dw32(DMACtrl, dr32(DMACtrl) | 0x00001000);
    /* Schedule ISR */
    dw32(CountDown, 10000);
    np->cur_tx = (np->cur_tx + 1) % TX_RING_SIZE;
    if ((np->cur_tx - np->old_tx + TX_RING_SIZE) % TX_RING_SIZE
            < TX_QUEUE_LEN - 1 && np->speed != 10) {
        /* do nothing */
    } else if (!netif_queue_stopped(dev)) {
        netif_stop_queue (dev);
    }

    /* The first TFDListPtr */
    if (!dr32(TFDListPtr0)) {
        dw32(TFDListPtr0, np->tx_ring_dma +
             entry * sizeof (struct netdev_desc));
        dw32(TFDListPtr1, 0);
    }

    return NETDEV_TX_OK;
}

static irqreturn_t
rio_interrupt (int irq, void *dev_instance)
{
    struct net_device *dev = dev_instance;
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    unsigned int_status;
    int cnt = max_intrloop;
    int handled = 0;

    while (1) {
        int_status = dr16(IntStatus);
        dw16(IntStatus, int_status);
        int_status &= DEFAULT_INTR;
        if (int_status == 0 || --cnt < 0)
            break;
        handled = 1;
        /* Processing received packets */
        if (int_status & RxDMAComplete)
            receive_packet (dev);
        /* TxDMAComplete interrupt */
        if ((int_status & (TxDMAComplete|IntRequested))) {
            int tx_status;
            tx_status = dr32(TxStatus);
            if (tx_status & 0x01)
                tx_error (dev, tx_status);
            /* Free used tx skbuffs */
            rio_free_tx (dev, 1);
        }

        /* Handle uncommon events */
        if (int_status &
            (HostError | LinkEvent | UpdateStats))
            rio_error (dev, int_status);
    }
    if (np->cur_tx != np->old_tx)
        dw32(CountDown, 100);
    return IRQ_RETVAL(handled);
}

static inline dma_addr_t desc_to_dma(struct netdev_desc *desc)
{
    return le64_to_cpu(desc->fraginfo) & DMA_BIT_MASK(48);
}

static void
rio_free_tx (struct net_device *dev, int irq)
{
    struct netdev_private *np = netdev_priv(dev);
    int entry = np->old_tx % TX_RING_SIZE;
    int tx_use = 0;
    unsigned long flag = 0;

    if (irq)
        spin_lock(&np->tx_lock);
    else
        spin_lock_irqsave(&np->tx_lock, flag);

    /* Free used tx skbuffs */
    while (entry != np->cur_tx) {
        struct sk_buff *skb;

        if (!(np->tx_ring[entry].status & cpu_to_le64(TFDDone)))
            break;
        skb = np->tx_skbuff[entry];
        pci_unmap_single (np->pdev,
                  desc_to_dma(&np->tx_ring[entry]),
                  skb->len, PCI_DMA_TODEVICE);
        if (irq)
            dev_kfree_skb_irq (skb);
        else
            dev_kfree_skb (skb);

        np->tx_skbuff[entry] = NULL;
        entry = (entry + 1) % TX_RING_SIZE;
        tx_use++;
    }
    if (irq)
        spin_unlock(&np->tx_lock);
    else
        spin_unlock_irqrestore(&np->tx_lock, flag);
    np->old_tx = entry;

    /* If the ring is no longer full, clear tx_full and
       call netif_wake_queue() */

    if (netif_queue_stopped(dev) &&
        ((np->cur_tx - np->old_tx + TX_RING_SIZE) % TX_RING_SIZE
        < TX_QUEUE_LEN - 1 || np->speed == 10)) {
        netif_wake_queue (dev);
    }
}

static void
tx_error (struct net_device *dev, int tx_status)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    int frame_id;
    int i;

    frame_id = (tx_status & 0xffff0000);
    printk (KERN_ERR "%s: Transmit error, TxStatus %4.4x, FrameId %d.\n",
        dev->name, tx_status, frame_id);
    np->stats.tx_errors++;
    /* Ttransmit Underrun */
    if (tx_status & 0x10) {
        np->stats.tx_fifo_errors++;
        dw16(TxStartThresh, dr16(TxStartThresh) + 0x10);
        /* Transmit Underrun need to set TxReset, DMARest, FIFOReset */
        dw16(ASICCtrl + 2,
             TxReset | DMAReset | FIFOReset | NetworkReset);
        /* Wait for ResetBusy bit clear */
        for (i = 50; i > 0; i--) {
            if (!(dr16(ASICCtrl + 2) & ResetBusy))
                break;
            mdelay (1);
        }
        rio_free_tx (dev, 1);
        /* Reset TFDListPtr */
        dw32(TFDListPtr0, np->tx_ring_dma +
             np->old_tx * sizeof (struct netdev_desc));
        dw32(TFDListPtr1, 0);

        /* Let TxStartThresh stay default value */
    }
    /* Late Collision */
    if (tx_status & 0x04) {
        np->stats.tx_fifo_errors++;
        /* TxReset and clear FIFO */
        dw16(ASICCtrl + 2, TxReset | FIFOReset);
        /* Wait reset done */
        for (i = 50; i > 0; i--) {
            if (!(dr16(ASICCtrl + 2) & ResetBusy))
                break;
            mdelay (1);
        }
        /* Let TxStartThresh stay default value */
    }
    /* Maximum Collisions */
#ifdef ETHER_STATS
    if (tx_status & 0x08)
        np->stats.collisions16++;
#else
    if (tx_status & 0x08)
        np->stats.collisions++;
#endif
    /* Restart the Tx */
    dw32(MACCtrl, dr16(MACCtrl) | TxEnable);
}

static int
receive_packet (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    int entry = np->cur_rx % RX_RING_SIZE;
    int cnt = 30;

    /* If RFDDone, FrameStart and FrameEnd set, there is a new packet in. */
    while (1) {
        struct netdev_desc *desc = &np->rx_ring[entry];
        int pkt_len;
        u64 frame_status;

        if (!(desc->status & cpu_to_le64(RFDDone)) ||
            !(desc->status & cpu_to_le64(FrameStart)) ||
            !(desc->status & cpu_to_le64(FrameEnd)))
            break;

        /* Chip omits the CRC. */
        frame_status = le64_to_cpu(desc->status);
        pkt_len = frame_status & 0xffff;
        if (--cnt < 0)
            break;
        /* Update rx error statistics, drop packet. */
        if (frame_status & RFS_Errors) {
            np->stats.rx_errors++;
            if (frame_status & (RxRuntFrame | RxLengthError))
                np->stats.rx_length_errors++;
            if (frame_status & RxFCSError)
                np->stats.rx_crc_errors++;
            if (frame_status & RxAlignmentError && np->speed != 1000)
                np->stats.rx_frame_errors++;
            if (frame_status & RxFIFOOverrun)
                np->stats.rx_fifo_errors++;
        } else {
            struct sk_buff *skb;

            /* Small skbuffs for short packets */
            if (pkt_len > copy_thresh) {
                pci_unmap_single (np->pdev,
                          desc_to_dma(desc),
                          np->rx_buf_sz,
                          PCI_DMA_FROMDEVICE);
                skb_put (skb = np->rx_skbuff[entry], pkt_len);
                np->rx_skbuff[entry] = NULL;
            } else if ((skb = netdev_alloc_skb_ip_align(dev, pkt_len))) {
                pci_dma_sync_single_for_cpu(np->pdev,
                                desc_to_dma(desc),
                                np->rx_buf_sz,
                                PCI_DMA_FROMDEVICE);
                skb_copy_to_linear_data (skb,
                          np->rx_skbuff[entry]->data,
                          pkt_len);
                skb_put (skb, pkt_len);
                pci_dma_sync_single_for_device(np->pdev,
                                   desc_to_dma(desc),
                                   np->rx_buf_sz,
                                   PCI_DMA_FROMDEVICE);
            }
            skb->protocol = eth_type_trans (skb, dev);
#if 0
            /* Checksum done by hw, but csum value unavailable. */
            if (np->pdev->pci_rev_id >= 0x0c &&
                !(frame_status & (TCPError | UDPError | IPError))) {
                skb->ip_summed = CHECKSUM_UNNECESSARY;
            }
#endif
            netif_rx (skb);
        }
        entry = (entry + 1) % RX_RING_SIZE;
    }
    spin_lock(&np->rx_lock);
    np->cur_rx = entry;
    /* Re-allocate skbuffs to fill the descriptor ring */
    entry = np->old_rx;
    while (entry != np->cur_rx) {
        struct sk_buff *skb;
        /* Dropped packets don't need to re-allocate */
        if (np->rx_skbuff[entry] == NULL) {
            skb = netdev_alloc_skb_ip_align(dev, np->rx_buf_sz);
            if (skb == NULL) {
                np->rx_ring[entry].fraginfo = 0;
                printk (KERN_INFO
                    "%s: receive_packet: "
                    "Unable to re-allocate Rx skbuff.#%d\n",
                    dev->name, entry);
                break;
            }
            np->rx_skbuff[entry] = skb;
            np->rx_ring[entry].fraginfo =
                cpu_to_le64 (pci_map_single
                     (np->pdev, skb->data, np->rx_buf_sz,
                      PCI_DMA_FROMDEVICE));
        }
        np->rx_ring[entry].fraginfo |=
            cpu_to_le64((u64)np->rx_buf_sz << 48);
        np->rx_ring[entry].status = 0;
        entry = (entry + 1) % RX_RING_SIZE;
    }
    np->old_rx = entry;
    spin_unlock(&np->rx_lock);
    return 0;
}

static void
rio_error (struct net_device *dev, int int_status)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    u16 macctrl;

    /* Link change event */
    if (int_status & LinkEvent) {
        if (mii_wait_link (dev, 10) == 0) {
            printk (KERN_INFO "%s: Link up\n", dev->name);
            if (np->phy_media)
                mii_get_media_pcs (dev);
            else
                mii_get_media (dev);
            if (np->speed == 1000)
                np->tx_coalesce = tx_coalesce;
            else
                np->tx_coalesce = 1;
            macctrl = 0;
            macctrl |= (np->vlan) ? AutoVLANuntagging : 0;
            macctrl |= (np->full_duplex) ? DuplexSelect : 0;
            macctrl |= (np->tx_flow) ?
                TxFlowControlEnable : 0;
            macctrl |= (np->rx_flow) ?
                RxFlowControlEnable : 0;
            dw16(MACCtrl, macctrl);
            np->link_status = 1;
            netif_carrier_on(dev);
        } else {
            printk (KERN_INFO "%s: Link off\n", dev->name);
            np->link_status = 0;
            netif_carrier_off(dev);
        }
    }

    /* UpdateStats statistics registers */
    if (int_status & UpdateStats) {
        get_stats (dev);
    }

    /* PCI Error, a catastronphic error related to the bus interface
       occurs, set GlobalReset and HostReset to reset. */
    if (int_status & HostError) {
        printk (KERN_ERR "%s: HostError! IntStatus %4.4x.\n",
            dev->name, int_status);
        dw16(ASICCtrl + 2, GlobalReset | HostReset);
        mdelay (500);
    }
}

static struct net_device_stats *
get_stats (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
#ifdef MEM_MAPPING
    int i;
#endif
    unsigned int stat_reg;

    /* All statistics registers need to be acknowledged,
       else statistic overflow could cause problems */

    np->stats.rx_packets += dr32(FramesRcvOk);
    np->stats.tx_packets += dr32(FramesXmtOk);
    np->stats.rx_bytes += dr32(OctetRcvOk);
    np->stats.tx_bytes += dr32(OctetXmtOk);

    np->stats.multicast = dr32(McstFramesRcvdOk);
    np->stats.collisions += dr32(SingleColFrames)
                 +  dr32(MultiColFrames);

    /* detailed tx errors */
    stat_reg = dr16(FramesAbortXSColls);
    np->stats.tx_aborted_errors += stat_reg;
    np->stats.tx_errors += stat_reg;

    stat_reg = dr16(CarrierSenseErrors);
    np->stats.tx_carrier_errors += stat_reg;
    np->stats.tx_errors += stat_reg;

    /* Clear all other statistic register. */
    dr32(McstOctetXmtOk);
    dr16(BcstFramesXmtdOk);
    dr32(McstFramesXmtdOk);
    dr16(BcstFramesRcvdOk);
    dr16(MacControlFramesRcvd);
    dr16(FrameTooLongErrors);
    dr16(InRangeLengthErrors);
    dr16(FramesCheckSeqErrors);
    dr16(FramesLostRxErrors);
    dr32(McstOctetXmtOk);
    dr32(BcstOctetXmtOk);
    dr32(McstFramesXmtdOk);
    dr32(FramesWDeferredXmt);
    dr32(LateCollisions);
    dr16(BcstFramesXmtdOk);
    dr16(MacControlFramesXmtd);
    dr16(FramesWEXDeferal);

#ifdef MEM_MAPPING
    for (i = 0x100; i <= 0x150; i += 4)
        dr32(i);
#endif
    dr16(TxJumboFrames);
    dr16(RxJumboFrames);
    dr16(TCPCheckSumErrors);
    dr16(UDPCheckSumErrors);
    dr16(IPCheckSumErrors);
    return &np->stats;
}

static int
clear_stats (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
#ifdef MEM_MAPPING
    int i;
#endif

    /* All statistics registers need to be acknowledged,
       else statistic overflow could cause problems */
    dr32(FramesRcvOk);
    dr32(FramesXmtOk);
    dr32(OctetRcvOk);
    dr32(OctetXmtOk);

    dr32(McstFramesRcvdOk);
    dr32(SingleColFrames);
    dr32(MultiColFrames);
    dr32(LateCollisions);
    /* detailed rx errors */
    dr16(FrameTooLongErrors);
    dr16(InRangeLengthErrors);
    dr16(FramesCheckSeqErrors);
    dr16(FramesLostRxErrors);

    /* detailed tx errors */
    dr16(FramesAbortXSColls);
    dr16(CarrierSenseErrors);

    /* Clear all other statistic register. */
    dr32(McstOctetXmtOk);
    dr16(BcstFramesXmtdOk);
    dr32(McstFramesXmtdOk);
    dr16(BcstFramesRcvdOk);
    dr16(MacControlFramesRcvd);
    dr32(McstOctetXmtOk);
    dr32(BcstOctetXmtOk);
    dr32(McstFramesXmtdOk);
    dr32(FramesWDeferredXmt);
    dr16(BcstFramesXmtdOk);
    dr16(MacControlFramesXmtd);
    dr16(FramesWEXDeferal);
#ifdef MEM_MAPPING
    for (i = 0x100; i <= 0x150; i += 4)
        dr32(i);
#endif
    dr16(TxJumboFrames);
    dr16(RxJumboFrames);
    dr16(TCPCheckSumErrors);
    dr16(UDPCheckSumErrors);
    dr16(IPCheckSumErrors);
    return 0;
}


static int
change_mtu (struct net_device *dev, int new_mtu)
{
    struct netdev_private *np = netdev_priv(dev);
    int max = (np->jumbo) ? MAX_JUMBO : 1536;

    if ((new_mtu < 68) || (new_mtu > max)) {
        return -EINVAL;
    }

    dev->mtu = new_mtu;

    return 0;
}

static void
set_multicast (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    u32 hash_table[2];
    u16 rx_mode = 0;

    hash_table[0] = hash_table[1] = 0;
    /* RxFlowcontrol DA: 01-80-C2-00-00-01. Hash index=0x39 */
    hash_table[1] |= 0x02000000;
    if (dev->flags & IFF_PROMISC) {
        /* Receive all frames promiscuously. */
        rx_mode = ReceiveAllFrames;
    } else if ((dev->flags & IFF_ALLMULTI) ||
            (netdev_mc_count(dev) > multicast_filter_limit)) {
        /* Receive broadcast and multicast frames */
        rx_mode = ReceiveBroadcast | ReceiveMulticast | ReceiveUnicast;
    } else if (!netdev_mc_empty(dev)) {
        struct netdev_hw_addr *ha;
        /* Receive broadcast frames and multicast frames filtering
           by Hashtable */
        rx_mode =
            ReceiveBroadcast | ReceiveMulticastHash | ReceiveUnicast;
        netdev_for_each_mc_addr(ha, dev) {
            int bit, index = 0;
            int crc = ether_crc_le(ETH_ALEN, ha->addr);
            /* The inverted high significant 6 bits of CRC are
               used as an index to hashtable */
            for (bit = 0; bit < 6; bit++)
                if (crc & (1 << (31 - bit)))
                    index |= (1 << bit);
            hash_table[index / 32] |= (1 << (index % 32));
        }
    } else {
        rx_mode = ReceiveBroadcast | ReceiveUnicast;
    }
    if (np->vlan) {
        /* ReceiveVLANMatch field in ReceiveMode */
        rx_mode |= ReceiveVLANMatch;
    }

    dw32(HashTable0, hash_table[0]);
    dw32(HashTable1, hash_table[1]);
    dw16(ReceiveMode, rx_mode);
}

static void rio_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
    struct netdev_private *np = netdev_priv(dev);
    strcpy(info->driver, "dl2k");
    strcpy(info->version, DRV_VERSION);
    strcpy(info->bus_info, pci_name(np->pdev));
}

static int rio_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct netdev_private *np = netdev_priv(dev);
    if (np->phy_media) {
        /* fiber device */
        cmd->supported = SUPPORTED_Autoneg | SUPPORTED_FIBRE;
        cmd->advertising= ADVERTISED_Autoneg | ADVERTISED_FIBRE;
        cmd->port = PORT_FIBRE;
        cmd->transceiver = XCVR_INTERNAL;
    } else {
        /* copper device */
        cmd->supported = SUPPORTED_10baseT_Half |
            SUPPORTED_10baseT_Full | SUPPORTED_100baseT_Half
            | SUPPORTED_100baseT_Full | SUPPORTED_1000baseT_Full |
            SUPPORTED_Autoneg | SUPPORTED_MII;
        cmd->advertising = ADVERTISED_10baseT_Half |
            ADVERTISED_10baseT_Full | ADVERTISED_100baseT_Half |
            ADVERTISED_100baseT_Full | ADVERTISED_1000baseT_Full|
            ADVERTISED_Autoneg | ADVERTISED_MII;
        cmd->port = PORT_MII;
        cmd->transceiver = XCVR_INTERNAL;
    }
    if ( np->link_status ) {
        ethtool_cmd_speed_set(cmd, np->speed);
        cmd->duplex = np->full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
    } else {
        ethtool_cmd_speed_set(cmd, -1);
        cmd->duplex = -1;
    }
    if ( np->an_enable)
        cmd->autoneg = AUTONEG_ENABLE;
    else
        cmd->autoneg = AUTONEG_DISABLE;

    cmd->phy_address = np->phy_addr;
    return 0;
}

static int rio_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct netdev_private *np = netdev_priv(dev);
    netif_carrier_off(dev);
    if (cmd->autoneg == AUTONEG_ENABLE) {
        if (np->an_enable)
            return 0;
        else {
            np->an_enable = 1;
            mii_set_media(dev);
            return 0;
        }
    } else {
        np->an_enable = 0;
        if (np->speed == 1000) {
            ethtool_cmd_speed_set(cmd, SPEED_100);
            cmd->duplex = DUPLEX_FULL;
            printk("Warning!! Can't disable Auto negotiation in 1000Mbps, change to Manual 100Mbps, Full duplex.\n");
        }
        switch (ethtool_cmd_speed(cmd)) {
        case SPEED_10:
            np->speed = 10;
            np->full_duplex = (cmd->duplex == DUPLEX_FULL);
            break;
        case SPEED_100:
            np->speed = 100;
            np->full_duplex = (cmd->duplex == DUPLEX_FULL);
            break;
        case SPEED_1000: /* not supported */
        default:
            return -EINVAL;
        }
        mii_set_media(dev);
    }
    return 0;
}

static u32 rio_get_link(struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    return np->link_status;
}

static const struct ethtool_ops ethtool_ops = {
    .get_drvinfo = rio_get_drvinfo,
    .get_settings = rio_get_settings,
    .set_settings = rio_set_settings,
    .get_link = rio_get_link,
};

static int
rio_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
{
    int phy_addr;
    struct netdev_private *np = netdev_priv(dev);
    struct mii_ioctl_data *miidata = if_mii(rq);

    phy_addr = np->phy_addr;
    switch (cmd) {
    case SIOCGMIIPHY:
        miidata->phy_id = phy_addr;
        break;
    case SIOCGMIIREG:
        miidata->val_out = mii_read (dev, phy_addr, miidata->reg_num);
        break;
    case SIOCSMIIREG:
        if (!capable(CAP_NET_ADMIN))
            return -EPERM;
        mii_write (dev, phy_addr, miidata->reg_num, miidata->val_in);
        break;
    default:
        return -EOPNOTSUPP;
    }
    return 0;
}

#define EEP_READ 0x0200
#define EEP_BUSY 0x8000
/* Read the EEPROM word */
/* We use I/O instruction to read/write eeprom to avoid fail on some machines */
static int read_eeprom(struct netdev_private *np, int eep_addr)
{
    void __iomem *ioaddr = np->eeprom_addr;
    int i = 1000;

    dw16(EepromCtrl, EEP_READ | (eep_addr & 0xff));
    while (i-- > 0) {
        if (!(dr16(EepromCtrl) & EEP_BUSY))
            return dr16(EepromData);
    }
    return 0;
}

enum phy_ctrl_bits {
    MII_READ = 0x00, MII_CLK = 0x01, MII_DATA1 = 0x02, MII_WRITE = 0x04,
    MII_DUPLEX = 0x08,
};

#define mii_delay() dr8(PhyCtrl)
static void
mii_sendbit (struct net_device *dev, u32 data)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;

    data = ((data) ? MII_DATA1 : 0) | (dr8(PhyCtrl) & 0xf8) | MII_WRITE;
    dw8(PhyCtrl, data);
    mii_delay ();
    dw8(PhyCtrl, data | MII_CLK);
    mii_delay ();
}

static int
mii_getbit (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;
    u8 data;

    data = (dr8(PhyCtrl) & 0xf8) | MII_READ;
    dw8(PhyCtrl, data);
    mii_delay ();
    dw8(PhyCtrl, data | MII_CLK);
    mii_delay ();
    return (dr8(PhyCtrl) >> 1) & 1;
}

static void
mii_send_bits (struct net_device *dev, u32 data, int len)
{
    int i;

    for (i = len - 1; i >= 0; i--) {
        mii_sendbit (dev, data & (1 << i));
    }
}

static int
mii_read (struct net_device *dev, int phy_addr, int reg_num)
{
    u32 cmd;
    int i;
    u32 retval = 0;

    /* Preamble */
    mii_send_bits (dev, 0xffffffff, 32);
    /* ST(2), OP(2), ADDR(5), REG#(5), TA(2), Data(16) total 32 bits */
    /* ST,OP = 0110'b for read operation */
    cmd = (0x06 << 10 | phy_addr << 5 | reg_num);
    mii_send_bits (dev, cmd, 14);
    /* Turnaround */
    if (mii_getbit (dev))
        goto err_out;
    /* Read data */
    for (i = 0; i < 16; i++) {
        retval |= mii_getbit (dev);
        retval <<= 1;
    }
    /* End cycle */
    mii_getbit (dev);
    return (retval >> 1) & 0xffff;

      err_out:
    return 0;
}
static int
mii_write (struct net_device *dev, int phy_addr, int reg_num, u16 data)
{
    u32 cmd;

    /* Preamble */
    mii_send_bits (dev, 0xffffffff, 32);
    /* ST(2), OP(2), ADDR(5), REG#(5), TA(2), Data(16) total 32 bits */
    /* ST,OP,AAAAA,RRRRR,TA = 0101xxxxxxxxxx10'b = 0x5002 for write */
    cmd = (0x5002 << 16) | (phy_addr << 23) | (reg_num << 18) | data;
    mii_send_bits (dev, cmd, 32);
    /* End cycle */
    mii_getbit (dev);
    return 0;
}
static int
mii_wait_link (struct net_device *dev, int wait)
{
    __u16 bmsr;
    int phy_addr;
    struct netdev_private *np;

    np = netdev_priv(dev);
    phy_addr = np->phy_addr;

    do {
        bmsr = mii_read (dev, phy_addr, MII_BMSR);
        if (bmsr & BMSR_LSTATUS)
            return 0;
        mdelay (1);
    } while (--wait > 0);
    return -1;
}
static int
mii_get_media (struct net_device *dev)
{
    __u16 negotiate;
    __u16 bmsr;
    __u16 mscr;
    __u16 mssr;
    int phy_addr;
    struct netdev_private *np;

    np = netdev_priv(dev);
    phy_addr = np->phy_addr;

    bmsr = mii_read (dev, phy_addr, MII_BMSR);
    if (np->an_enable) {
        if (!(bmsr & BMSR_ANEGCOMPLETE)) {
            /* Auto-Negotiation not completed */
            return -1;
        }
        negotiate = mii_read (dev, phy_addr, MII_ADVERTISE) &
            mii_read (dev, phy_addr, MII_LPA);
        mscr = mii_read (dev, phy_addr, MII_CTRL1000);
        mssr = mii_read (dev, phy_addr, MII_STAT1000);
        if (mscr & ADVERTISE_1000FULL && mssr & LPA_1000FULL) {
            np->speed = 1000;
            np->full_duplex = 1;
            printk (KERN_INFO "Auto 1000 Mbps, Full duplex\n");
        } else if (mscr & ADVERTISE_1000HALF && mssr & LPA_1000HALF) {
            np->speed = 1000;
            np->full_duplex = 0;
            printk (KERN_INFO "Auto 1000 Mbps, Half duplex\n");
        } else if (negotiate & ADVERTISE_100FULL) {
            np->speed = 100;
            np->full_duplex = 1;
            printk (KERN_INFO "Auto 100 Mbps, Full duplex\n");
        } else if (negotiate & ADVERTISE_100HALF) {
            np->speed = 100;
            np->full_duplex = 0;
            printk (KERN_INFO "Auto 100 Mbps, Half duplex\n");
        } else if (negotiate & ADVERTISE_10FULL) {
            np->speed = 10;
            np->full_duplex = 1;
            printk (KERN_INFO "Auto 10 Mbps, Full duplex\n");
        } else if (negotiate & ADVERTISE_10HALF) {
            np->speed = 10;
            np->full_duplex = 0;
            printk (KERN_INFO "Auto 10 Mbps, Half duplex\n");
        }
        if (negotiate & ADVERTISE_PAUSE_CAP) {
            np->tx_flow &= 1;
            np->rx_flow &= 1;
        } else if (negotiate & ADVERTISE_PAUSE_ASYM) {
            np->tx_flow = 0;
            np->rx_flow &= 1;
        }
        /* else tx_flow, rx_flow = user select  */
    } else {
        __u16 bmcr = mii_read (dev, phy_addr, MII_BMCR);
        switch (bmcr & (BMCR_SPEED100 | BMCR_SPEED1000)) {
        case BMCR_SPEED1000:
            printk (KERN_INFO "Operating at 1000 Mbps, ");
            break;
        case BMCR_SPEED100:
            printk (KERN_INFO "Operating at 100 Mbps, ");
            break;
        case 0:
            printk (KERN_INFO "Operating at 10 Mbps, ");
        }
        if (bmcr & BMCR_FULLDPLX) {
            printk (KERN_CONT "Full duplex\n");
        } else {
            printk (KERN_CONT "Half duplex\n");
        }
    }
    if (np->tx_flow)
        printk(KERN_INFO "Enable Tx Flow Control\n");
    else
        printk(KERN_INFO "Disable Tx Flow Control\n");
    if (np->rx_flow)
        printk(KERN_INFO "Enable Rx Flow Control\n");
    else
        printk(KERN_INFO "Disable Rx Flow Control\n");

    return 0;
}

static int
mii_set_media (struct net_device *dev)
{
    __u16 pscr;
    __u16 bmcr;
    __u16 bmsr;
    __u16 anar;
    int phy_addr;
    struct netdev_private *np;
    np = netdev_priv(dev);
    phy_addr = np->phy_addr;

    /* Does user set speed? */
    if (np->an_enable) {
        /* Advertise capabilities */
        bmsr = mii_read (dev, phy_addr, MII_BMSR);
        anar = mii_read (dev, phy_addr, MII_ADVERTISE) &
            ~(ADVERTISE_100FULL | ADVERTISE_10FULL |
              ADVERTISE_100HALF | ADVERTISE_10HALF |
              ADVERTISE_100BASE4);
        if (bmsr & BMSR_100FULL)
            anar |= ADVERTISE_100FULL;
        if (bmsr & BMSR_100HALF)
            anar |= ADVERTISE_100HALF;
        if (bmsr & BMSR_100BASE4)
            anar |= ADVERTISE_100BASE4;
        if (bmsr & BMSR_10FULL)
            anar |= ADVERTISE_10FULL;
        if (bmsr & BMSR_10HALF)
            anar |= ADVERTISE_10HALF;
        anar |= ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
        mii_write (dev, phy_addr, MII_ADVERTISE, anar);

        /* Enable Auto crossover */
        pscr = mii_read (dev, phy_addr, MII_PHY_SCR);
        pscr |= 3 << 5; /* 11'b */
        mii_write (dev, phy_addr, MII_PHY_SCR, pscr);

        /* Soft reset PHY */
        mii_write (dev, phy_addr, MII_BMCR, BMCR_RESET);
        bmcr = BMCR_ANENABLE | BMCR_ANRESTART | BMCR_RESET;
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay(1);
    } else {
        /* Force speed setting */
        /* 1) Disable Auto crossover */
        pscr = mii_read (dev, phy_addr, MII_PHY_SCR);
        pscr &= ~(3 << 5);
        mii_write (dev, phy_addr, MII_PHY_SCR, pscr);

        /* 2) PHY Reset */
        bmcr = mii_read (dev, phy_addr, MII_BMCR);
        bmcr |= BMCR_RESET;
        mii_write (dev, phy_addr, MII_BMCR, bmcr);

        /* 3) Power Down */
        bmcr = 0x1940;  /* must be 0x1940 */
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay (100);   /* wait a certain time */

        /* 4) Advertise nothing */
        mii_write (dev, phy_addr, MII_ADVERTISE, 0);

        /* 5) Set media and Power Up */
        bmcr = BMCR_PDOWN;
        if (np->speed == 100) {
            bmcr |= BMCR_SPEED100;
            printk (KERN_INFO "Manual 100 Mbps, ");
        } else if (np->speed == 10) {
            printk (KERN_INFO "Manual 10 Mbps, ");
        }
        if (np->full_duplex) {
            bmcr |= BMCR_FULLDPLX;
            printk (KERN_CONT "Full duplex\n");
        } else {
            printk (KERN_CONT "Half duplex\n");
        }
#if 0
        /* Set 1000BaseT Master/Slave setting */
        mscr = mii_read (dev, phy_addr, MII_CTRL1000);
        mscr |= MII_MSCR_CFG_ENABLE;
        mscr &= ~MII_MSCR_CFG_VALUE = 0;
#endif
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay(10);
    }
    return 0;
}

static int
mii_get_media_pcs (struct net_device *dev)
{
    __u16 negotiate;
    __u16 bmsr;
    int phy_addr;
    struct netdev_private *np;

    np = netdev_priv(dev);
    phy_addr = np->phy_addr;

    bmsr = mii_read (dev, phy_addr, PCS_BMSR);
    if (np->an_enable) {
        if (!(bmsr & BMSR_ANEGCOMPLETE)) {
            /* Auto-Negotiation not completed */
            return -1;
        }
        negotiate = mii_read (dev, phy_addr, PCS_ANAR) &
            mii_read (dev, phy_addr, PCS_ANLPAR);
        np->speed = 1000;
        if (negotiate & PCS_ANAR_FULL_DUPLEX) {
            printk (KERN_INFO "Auto 1000 Mbps, Full duplex\n");
            np->full_duplex = 1;
        } else {
            printk (KERN_INFO "Auto 1000 Mbps, half duplex\n");
            np->full_duplex = 0;
        }
        if (negotiate & PCS_ANAR_PAUSE) {
            np->tx_flow &= 1;
            np->rx_flow &= 1;
        } else if (negotiate & PCS_ANAR_ASYMMETRIC) {
            np->tx_flow = 0;
            np->rx_flow &= 1;
        }
        /* else tx_flow, rx_flow = user select  */
    } else {
        __u16 bmcr = mii_read (dev, phy_addr, PCS_BMCR);
        printk (KERN_INFO "Operating at 1000 Mbps, ");
        if (bmcr & BMCR_FULLDPLX) {
            printk (KERN_CONT "Full duplex\n");
        } else {
            printk (KERN_CONT "Half duplex\n");
        }
    }
    if (np->tx_flow)
        printk(KERN_INFO "Enable Tx Flow Control\n");
    else
        printk(KERN_INFO "Disable Tx Flow Control\n");
    if (np->rx_flow)
        printk(KERN_INFO "Enable Rx Flow Control\n");
    else
        printk(KERN_INFO "Disable Rx Flow Control\n");

    return 0;
}

static int
mii_set_media_pcs (struct net_device *dev)
{
    __u16 bmcr;
    __u16 esr;
    __u16 anar;
    int phy_addr;
    struct netdev_private *np;
    np = netdev_priv(dev);
    phy_addr = np->phy_addr;

    /* Auto-Negotiation? */
    if (np->an_enable) {
        /* Advertise capabilities */
        esr = mii_read (dev, phy_addr, PCS_ESR);
        anar = mii_read (dev, phy_addr, MII_ADVERTISE) &
            ~PCS_ANAR_HALF_DUPLEX &
            ~PCS_ANAR_FULL_DUPLEX;
        if (esr & (MII_ESR_1000BT_HD | MII_ESR_1000BX_HD))
            anar |= PCS_ANAR_HALF_DUPLEX;
        if (esr & (MII_ESR_1000BT_FD | MII_ESR_1000BX_FD))
            anar |= PCS_ANAR_FULL_DUPLEX;
        anar |= PCS_ANAR_PAUSE | PCS_ANAR_ASYMMETRIC;
        mii_write (dev, phy_addr, MII_ADVERTISE, anar);

        /* Soft reset PHY */
        mii_write (dev, phy_addr, MII_BMCR, BMCR_RESET);
        bmcr = BMCR_ANENABLE | BMCR_ANRESTART | BMCR_RESET;
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay(1);
    } else {
        /* Force speed setting */
        /* PHY Reset */
        bmcr = BMCR_RESET;
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay(10);
        if (np->full_duplex) {
            bmcr = BMCR_FULLDPLX;
            printk (KERN_INFO "Manual full duplex\n");
        } else {
            bmcr = 0;
            printk (KERN_INFO "Manual half duplex\n");
        }
        mii_write (dev, phy_addr, MII_BMCR, bmcr);
        mdelay(10);

        /*  Advertise nothing */
        mii_write (dev, phy_addr, MII_ADVERTISE, 0);
    }
    return 0;
}


static int
rio_close (struct net_device *dev)
{
    struct netdev_private *np = netdev_priv(dev);
    void __iomem *ioaddr = np->ioaddr;

    struct pci_dev *pdev = np->pdev;
    struct sk_buff *skb;
    int i;

    netif_stop_queue (dev);

    /* Disable interrupts */
    dw16(IntEnable, 0);

    /* Stop Tx and Rx logics */
    dw32(MACCtrl, TxDisable | RxDisable | StatsDisable);

    free_irq(pdev->irq, dev);
    del_timer_sync (&np->timer);

    /* Free all the skbuffs in the queue. */
    for (i = 0; i < RX_RING_SIZE; i++) {
        skb = np->rx_skbuff[i];
        if (skb) {
            pci_unmap_single(pdev, desc_to_dma(&np->rx_ring[i]),
                     skb->len, PCI_DMA_FROMDEVICE);
            dev_kfree_skb (skb);
            np->rx_skbuff[i] = NULL;
        }
        np->rx_ring[i].status = 0;
        np->rx_ring[i].fraginfo = 0;
    }
    for (i = 0; i < TX_RING_SIZE; i++) {
        skb = np->tx_skbuff[i];
        if (skb) {
            pci_unmap_single(pdev, desc_to_dma(&np->tx_ring[i]),
                     skb->len, PCI_DMA_TODEVICE);
            dev_kfree_skb (skb);
            np->tx_skbuff[i] = NULL;
        }
    }

    return 0;
}

static void __devexit
rio_remove1 (struct pci_dev *pdev)
{
    struct net_device *dev = pci_get_drvdata (pdev);

    if (dev) {
        struct netdev_private *np = netdev_priv(dev);

        unregister_netdev (dev);
        pci_free_consistent (pdev, RX_TOTAL_SIZE, np->rx_ring,
                     np->rx_ring_dma);
        pci_free_consistent (pdev, TX_TOTAL_SIZE, np->tx_ring,
                     np->tx_ring_dma);
#ifdef MEM_MAPPING
        pci_iounmap(pdev, np->ioaddr);
#endif
        pci_iounmap(pdev, np->eeprom_addr);
        free_netdev (dev);
        pci_release_regions (pdev);
        pci_disable_device (pdev);
    }
    pci_set_drvdata (pdev, NULL);
}

static struct pci_driver rio_driver = {
    .name       = "dl2k",
    .id_table   = rio_pci_tbl,
    .probe      = rio_probe1,
    .remove     = __devexit_p(rio_remove1),
};

static int __init
rio_init (void)
{
    return pci_register_driver(&rio_driver);
}

static void __exit
rio_exit (void)
{
    pci_unregister_driver (&rio_driver);
}

module_init (rio_init);
module_exit (rio_exit);

/*

Compile command:

gcc -D__KERNEL__ -DMODULE -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -c dl2k.c

Read Documentation/networking/dl2k.txt for details.

*/