source: bootcd/isolinux/syslinux-6.03/gpxe/src/drivers/net/pcnet32.c

/**************************************************************************
*
*    pcnet32.c -- Etherboot device driver for the AMD PCnet32
*    Written 2003-2003 by Timothy Legge <tlegge@rogers.com>
*
*    This program is free software; you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation; either version 2 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program; if not, write to the Free Software
*    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*    Portions of this code based on:
*               pcnet32.c: An AMD PCnet32 ethernet driver for linux:
*
*       (C) 1996-1999 Thomas Bogendoerfer
*               See Linux Driver for full information
*       
*       The transmit and poll functions were written with reference to:
*       lance.c - LANCE NIC driver for Etherboot written by Ken Yap 
*       
*       Linux Driver Version 1.27a, 10.02.2002
* 
* 
*    REVISION HISTORY:
*    ================
*    v1.0       08-06-2003      timlegge        Initial port of Linux driver
*    v1.1       08-23-2003      timlegge        Add multicast support
*    v1.2       01-17-2004      timlegge        Initial driver output cleanup
*    v1.3       03-29-2004      timlegge        More driver cleanup
*    
*    Indent Options: indent -kr -i8
***************************************************************************/

FILE_LICENCE ( GPL2_OR_LATER );

#include "etherboot.h"
#include "nic.h"
#include <gpxe/pci.h>
#include <gpxe/ethernet.h>
#include "mii.h"

/* void hex_dump(const char *data, const unsigned int len); */

/* Etherboot Specific definations */
#define drv_version "v1.3"
#define drv_date "03-29-2004"

static u32 ioaddr;              /* Globally used for the card's io address */
static struct nic_operations pcnet32_operations;

#ifdef EDEBUG
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif

/* Condensed operations for readability. */
#define virt_to_le32desc(addr)  cpu_to_le32(virt_to_bus(addr))
#define le32desc_to_virt(addr)  bus_to_virt(le32_to_cpu(addr))

/* End Etherboot Specific */

static int cards_found = 0 /* __initdata */ ;

#ifdef REMOVE
/* FIXME: Remove these they are probably pointless */

/* 
 * VLB I/O addresses 
 */
static unsigned int pcnet32_portlist[] /*__initdata */  =
{ 0x300, 0x320, 0x340, 0x360, 0 };

static int pcnet32_debug = 1;
static int tx_start = 1;        /* Mapping -- 0:20, 1:64, 2:128, 3:~220 (depends on chip vers) */
static int pcnet32vlb;          /* check for VLB cards ? */

static struct net_device *pcnet32_dev;

static int max_interrupt_work = 80;
static int rx_copybreak = 200;
#endif
#define PCNET32_PORT_AUI      0x00
#define PCNET32_PORT_10BT     0x01
#define PCNET32_PORT_GPSI     0x02
#define PCNET32_PORT_MII      0x03

#define PCNET32_PORT_PORTSEL  0x03
#define PCNET32_PORT_ASEL     0x04
#define PCNET32_PORT_100      0x40
#define PCNET32_PORT_FD       0x80

#define PCNET32_DMA_MASK 0xffffffff

/*
 * table to translate option values from tulip
 * to internal options
 */
static unsigned char options_mapping[] = {
        PCNET32_PORT_ASEL,      /*  0 Auto-select      */
        PCNET32_PORT_AUI,       /*  1 BNC/AUI          */
        PCNET32_PORT_AUI,       /*  2 AUI/BNC          */
        PCNET32_PORT_ASEL,      /*  3 not supported    */
        PCNET32_PORT_10BT | PCNET32_PORT_FD,    /*  4 10baseT-FD       */
        PCNET32_PORT_ASEL,      /*  5 not supported    */
        PCNET32_PORT_ASEL,      /*  6 not supported    */
        PCNET32_PORT_ASEL,      /*  7 not supported    */
        PCNET32_PORT_ASEL,      /*  8 not supported    */
        PCNET32_PORT_MII,       /*  9 MII 10baseT      */
        PCNET32_PORT_MII | PCNET32_PORT_FD,     /* 10 MII 10baseT-FD   */
        PCNET32_PORT_MII,       /* 11 MII (autosel)    */
        PCNET32_PORT_10BT,      /* 12 10BaseT          */
        PCNET32_PORT_MII | PCNET32_PORT_100,    /* 13 MII 100BaseTx    */
        PCNET32_PORT_MII | PCNET32_PORT_100 | PCNET32_PORT_FD,  /* 14 MII 100BaseTx-FD */
        PCNET32_PORT_ASEL       /* 15 not supported    */
};

#define MAX_UNITS 8             /* More are supported, limit only on options */
static int options[MAX_UNITS];
static int full_duplex[MAX_UNITS];

/*
 *                              Theory of Operation
 * 
 * This driver uses the same software structure as the normal lance
 * driver. So look for a verbose description in lance.c. The differences
 * to the normal lance driver is the use of the 32bit mode of PCnet32
 * and PCnetPCI chips. Because these chips are 32bit chips, there is no
 * 16MB limitation and we don't need bounce buffers.
 */



/*
 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
 */
#ifndef PCNET32_LOG_TX_BUFFERS
#define PCNET32_LOG_TX_BUFFERS 1
#define PCNET32_LOG_RX_BUFFERS 2
#endif

#define TX_RING_SIZE            (1 << (PCNET32_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK        (TX_RING_SIZE - 1)
/* FIXME: Fix this to allow multiple tx_ring descriptors */
#define TX_RING_LEN_BITS        0x0000  /*PCNET32_LOG_TX_BUFFERS) << 12) */

#define RX_RING_SIZE            (1 << (PCNET32_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK        (RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS        ((PCNET32_LOG_RX_BUFFERS) << 4)

#define PKT_BUF_SZ              1544

/* Offsets from base I/O address. */
#define PCNET32_WIO_RDP         0x10
#define PCNET32_WIO_RAP         0x12
#define PCNET32_WIO_RESET       0x14
#define PCNET32_WIO_BDP         0x16

#define PCNET32_DWIO_RDP        0x10
#define PCNET32_DWIO_RAP        0x14
#define PCNET32_DWIO_RESET      0x18
#define PCNET32_DWIO_BDP        0x1C

#define PCNET32_TOTAL_SIZE      0x20

/* The PCNET32 Rx and Tx ring descriptors. */
struct pcnet32_rx_head {
        u32 base;
        s16 buf_length;
        s16 status;
        u32 msg_length;
        u32 reserved;
};

struct pcnet32_tx_head {
        u32 base;
        s16 length;
        s16 status;
        u32 misc;
        u32 reserved;
};

/* The PCNET32 32-Bit initialization block, described in databook. */
struct pcnet32_init_block {
        u16 mode;
        u16 tlen_rlen;
        u8 phys_addr[6];
        u16 reserved;
        u32 filter[2];
        /* Receive and transmit ring base, along with extra bits. */
        u32 rx_ring;
        u32 tx_ring;
};
/* PCnet32 access functions */
struct pcnet32_access {
        u16(*read_csr) (unsigned long, int);
        void (*write_csr) (unsigned long, int, u16);
         u16(*read_bcr) (unsigned long, int);
        void (*write_bcr) (unsigned long, int, u16);
         u16(*read_rap) (unsigned long);
        void (*write_rap) (unsigned long, u16);
        void (*reset) (unsigned long);
};

/* Define the TX and RX Descriptors and Rings */
struct {
        struct pcnet32_tx_head tx_ring[TX_RING_SIZE]
        __attribute__ ((aligned(16)));
        struct pcnet32_rx_head rx_ring[RX_RING_SIZE]
        __attribute__ ((aligned(16)));
        unsigned char txb[TX_RING_SIZE][PKT_BUF_SZ];
        unsigned char rxb[RX_RING_SIZE][PKT_BUF_SZ];
} pcnet32_bufs __shared;


/*
 * The first three fields of pcnet32_private are read by the ethernet device 
 * so we allocate the structure should be allocated by pci_alloc_consistent().
 */
#define MII_CNT 4
struct pcnet32_private {
        struct pcnet32_init_block init_block;
        struct pci_dev *pci_dev;        /* Pointer to the associated pci device structure */
        const char *name;
        /* The saved address of a sent-in-place packet/buffer, for skfree(). */
        struct sk_buff *tx_skbuff[TX_RING_SIZE];
        struct sk_buff *rx_skbuff[RX_RING_SIZE];
        struct pcnet32_access a;
        unsigned int cur_rx, cur_tx;    /* The next free ring entry */
        char tx_full;
        int options;
        int shared_irq:1,       /* shared irq possible */
         ltint:1,               /* enable TxDone-intr inhibitor */
         dxsuflo:1,             /* disable transmit stop on uflo */
         mii:1;                 /* mii port available */
        struct mii_if_info mii_if;
        unsigned char phys[MII_CNT];
        struct net_device *next;
        int full_duplex:1;
} lpx;

static struct pcnet32_private *lp;

static int mdio_read(struct nic *nic __unused, int phy_id, int reg_num);
#if 0
static void mdio_write(struct nic *nic __unused, int phy_id, int reg_num,
                       int val);
#endif
enum pci_flags_bit {
        PCI_USES_IO = 1, PCI_USES_MEM = 2, PCI_USES_MASTER = 4,
        PCI_ADDR0 = 0x10 << 0, PCI_ADDR1 = 0x10 << 1, PCI_ADDR2 =
            0x10 << 2, PCI_ADDR3 = 0x10 << 3,
};


static u16 pcnet32_wio_read_csr(unsigned long addr, int index)
{
        outw(index, addr + PCNET32_WIO_RAP);
        return inw(addr + PCNET32_WIO_RDP);
}

static void pcnet32_wio_write_csr(unsigned long addr, int index, u16 val)
{
        outw(index, addr + PCNET32_WIO_RAP);
        outw(val, addr + PCNET32_WIO_RDP);
}

static u16 pcnet32_wio_read_bcr(unsigned long addr, int index)
{
        outw(index, addr + PCNET32_WIO_RAP);
        return inw(addr + PCNET32_WIO_BDP);
}

static void pcnet32_wio_write_bcr(unsigned long addr, int index, u16 val)
{
        outw(index, addr + PCNET32_WIO_RAP);
        outw(val, addr + PCNET32_WIO_BDP);
}

static u16 pcnet32_wio_read_rap(unsigned long addr)
{
        return inw(addr + PCNET32_WIO_RAP);
}

static void pcnet32_wio_write_rap(unsigned long addr, u16 val)
{
        outw(val, addr + PCNET32_WIO_RAP);
}

static void pcnet32_wio_reset(unsigned long addr)
{
        inw(addr + PCNET32_WIO_RESET);
}

static int pcnet32_wio_check(unsigned long addr)
{
        outw(88, addr + PCNET32_WIO_RAP);
        return (inw(addr + PCNET32_WIO_RAP) == 88);
}

static struct pcnet32_access pcnet32_wio = {
      read_csr:pcnet32_wio_read_csr,
      write_csr:pcnet32_wio_write_csr,
      read_bcr:pcnet32_wio_read_bcr,
      write_bcr:pcnet32_wio_write_bcr,
      read_rap:pcnet32_wio_read_rap,
      write_rap:pcnet32_wio_write_rap,
      reset:pcnet32_wio_reset
};

static u16 pcnet32_dwio_read_csr(unsigned long addr, int index)
{
        outl(index, addr + PCNET32_DWIO_RAP);
        return (inl(addr + PCNET32_DWIO_RDP) & 0xffff);
}

static void pcnet32_dwio_write_csr(unsigned long addr, int index, u16 val)
{
        outl(index, addr + PCNET32_DWIO_RAP);
        outl(val, addr + PCNET32_DWIO_RDP);
}

static u16 pcnet32_dwio_read_bcr(unsigned long addr, int index)
{
        outl(index, addr + PCNET32_DWIO_RAP);
        return (inl(addr + PCNET32_DWIO_BDP) & 0xffff);
}

static void pcnet32_dwio_write_bcr(unsigned long addr, int index, u16 val)
{
        outl(index, addr + PCNET32_DWIO_RAP);
        outl(val, addr + PCNET32_DWIO_BDP);
}

static u16 pcnet32_dwio_read_rap(unsigned long addr)
{
        return (inl(addr + PCNET32_DWIO_RAP) & 0xffff);
}

static void pcnet32_dwio_write_rap(unsigned long addr, u16 val)
{
        outl(val, addr + PCNET32_DWIO_RAP);
}

static void pcnet32_dwio_reset(unsigned long addr)
{
        inl(addr + PCNET32_DWIO_RESET);
}

static int pcnet32_dwio_check(unsigned long addr)
{
        outl(88, addr + PCNET32_DWIO_RAP);
        return ((inl(addr + PCNET32_DWIO_RAP) & 0xffff) == 88);
}

static struct pcnet32_access pcnet32_dwio = {
      read_csr:pcnet32_dwio_read_csr,
      write_csr:pcnet32_dwio_write_csr,
      read_bcr:pcnet32_dwio_read_bcr,
      write_bcr:pcnet32_dwio_write_bcr,
      read_rap:pcnet32_dwio_read_rap,
      write_rap:pcnet32_dwio_write_rap,
      reset:pcnet32_dwio_reset
};


/* Initialize the PCNET32 Rx and Tx rings. */
static int pcnet32_init_ring(struct nic *nic)
{
        int i;

        lp->tx_full = 0;
        lp->cur_rx = lp->cur_tx = 0;

        for (i = 0; i < RX_RING_SIZE; i++) {
                pcnet32_bufs.rx_ring[i].base =
                        virt_to_le32desc(&pcnet32_bufs.rxb[i]);
                pcnet32_bufs.rx_ring[i].buf_length = le16_to_cpu(-PKT_BUF_SZ);
                pcnet32_bufs.rx_ring[i].status = le16_to_cpu(0x8000);
        }

        /* The Tx buffer address is filled in as needed, but we do need to clear
           the upper ownership bit. */
        for (i = 0; i < TX_RING_SIZE; i++) {
                pcnet32_bufs.tx_ring[i].base = 0;
                pcnet32_bufs.tx_ring[i].status = 0;
        }


        lp->init_block.tlen_rlen =
            le16_to_cpu(TX_RING_LEN_BITS | RX_RING_LEN_BITS);
        for (i = 0; i < 6; i++)
                lp->init_block.phys_addr[i] = nic->node_addr[i];
        lp->init_block.rx_ring = virt_to_le32desc(&pcnet32_bufs.rx_ring[0]);
        lp->init_block.tx_ring = virt_to_le32desc(&pcnet32_bufs.tx_ring[0]);
        return 0;
}

/**************************************************************************
RESET - Reset adapter
***************************************************************************/
static void pcnet32_reset(struct nic *nic)
{
        /* put the card in its initial state */
        u16 val;
        int i;

        /* Reset the PCNET32 */
        lp->a.reset(ioaddr);

        /* switch pcnet32 to 32bit mode */
        lp->a.write_bcr(ioaddr, 20, 2);

        /* set/reset autoselect bit */
        val = lp->a.read_bcr(ioaddr, 2) & ~2;
        if (lp->options & PCNET32_PORT_ASEL)
                val |= 2;
        lp->a.write_bcr(ioaddr, 2, val);

        /* handle full duplex setting */
        if (lp->full_duplex) {
                val = lp->a.read_bcr(ioaddr, 9) & ~3;
                if (lp->options & PCNET32_PORT_FD) {
                        val |= 1;
                        if (lp->options ==
                            (PCNET32_PORT_FD | PCNET32_PORT_AUI))
                                val |= 2;
                } else if (lp->options & PCNET32_PORT_ASEL) {
                        /* workaround of xSeries250, turn on for 79C975 only */
                        i = ((lp->a.
                              read_csr(ioaddr,
                                       88) | (lp->a.read_csr(ioaddr,
                                                             89) << 16)) >>
                             12) & 0xffff;
                        if (i == 0x2627)
                                val |= 3;
                }
                lp->a.write_bcr(ioaddr, 9, val);
        }

        /* set/reset GPSI bit in test register */
        val = lp->a.read_csr(ioaddr, 124) & ~0x10;
        if ((lp->options & PCNET32_PORT_PORTSEL) == PCNET32_PORT_GPSI)
                val |= 0x10;
        lp->a.write_csr(ioaddr, 124, val);

        if (lp->mii && !(lp->options & PCNET32_PORT_ASEL)) {
                val = lp->a.read_bcr(ioaddr, 32) & ~0x38;       /* disable Auto Negotiation, set 10Mpbs, HD */
                if (lp->options & PCNET32_PORT_FD)
                        val |= 0x10;
                if (lp->options & PCNET32_PORT_100)
                        val |= 0x08;
                lp->a.write_bcr(ioaddr, 32, val);
        } else {
                if (lp->options & PCNET32_PORT_ASEL) {  /* enable auto negotiate, setup, disable fd */
                        val = lp->a.read_bcr(ioaddr, 32) & ~0x98;
                        val |= 0x20;
                        lp->a.write_bcr(ioaddr, 32, val);
                }
        }

#ifdef DO_DXSUFLO
        if (lp->dxsuflo) {      /* Disable transmit stop on underflow */
                val = lp->a.read_csr(ioaddr, 3);
                val |= 0x40;
                lp->a.write_csr(ioaddr, 3, val);
        }
#endif
        if (1)
        {
                //disable interrupts
                val = lp->a.read_csr(ioaddr, 3);
                val = val
                        | (1 << 14) //BABLM intr disabled
                        | (1 << 12) //MISSM missed frame mask intr disabled
                        | (1 << 10) //RINTM receive intr disabled
                        | (1 << 9) //TINTM transmit intr disabled
                        | (1 << 8) //IDONM init done intr disabled
                        ;
                lp->a.write_csr(ioaddr, 3, val);
        }

        if (lp->ltint) {        /* Enable TxDone-intr inhibitor */
                val = lp->a.read_csr(ioaddr, 5);
                val |= (1 << 14);
                lp->a.write_csr(ioaddr, 5, val);
        }
        lp->init_block.mode =
            le16_to_cpu((lp->options & PCNET32_PORT_PORTSEL) << 7);
        lp->init_block.filter[0] = 0xffffffff;
        lp->init_block.filter[1] = 0xffffffff;

        pcnet32_init_ring(nic);


        /* Re-initialize the PCNET32, and start it when done. */
        lp->a.write_csr(ioaddr, 1,
                        (virt_to_bus(&lp->init_block)) & 0xffff);
        lp->a.write_csr(ioaddr, 2, (virt_to_bus(&lp->init_block)) >> 16);
        lp->a.write_csr(ioaddr, 4, 0x0915);
        lp->a.write_csr(ioaddr, 0, 0x0001);


        i = 0;
        while (i++ < 100)
                if (lp->a.read_csr(ioaddr, 0) & 0x0100)
                        break;
        /* 
         * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
         * reports that doing so triggers a bug in the '974.
         */
        lp->a.write_csr(ioaddr, 0, 0x0042);

        dprintf(("pcnet32 open, csr0 %hX.\n", lp->a.read_csr(ioaddr, 0)));

}

/**************************************************************************
POLL - Wait for a frame
***************************************************************************/
static int pcnet32_poll(struct nic *nic __unused, int retrieve)
{
        /* return true if there's an ethernet packet ready to read */
        /* nic->packet should contain data on return */
        /* nic->packetlen should contain length of data */

        signed char status;
        int entry;

        entry = lp->cur_rx & RX_RING_MOD_MASK;
        status = (le16_to_cpu(pcnet32_bufs.rx_ring[entry].status) >> 8);

        if (status < 0)
                return 0;

        if ( ! retrieve ) return 1;

        if (status == 0x03) {
                nic->packetlen =
                        (le32_to_cpu(pcnet32_bufs.rx_ring[entry].msg_length)
                         & 0xfff) - 4;
                memcpy(nic->packet, &pcnet32_bufs.rxb[entry], nic->packetlen);

                /* Andrew Boyd of QNX reports that some revs of the 79C765
                 * clear the buffer length */
                pcnet32_bufs.rx_ring[entry].buf_length
                        = le16_to_cpu(-PKT_BUF_SZ);
                /* prime for next receive */
                pcnet32_bufs.rx_ring[entry].status |= le16_to_cpu(0x8000);
                /* Switch to the next Rx ring buffer */
                lp->cur_rx++;

        } else {
                return 0;
        }

        return 1;
}

/**************************************************************************
TRANSMIT - Transmit a frame
***************************************************************************/
static void pcnet32_transmit(struct nic *nic __unused, const char *d,   /* Destination */
                             unsigned int t,    /* Type */
                             unsigned int s,    /* size */
                             const char *p)
{                               /* Packet */
        /* send the packet to destination */
        unsigned long time;
        u8 *ptxb;
        u16 nstype;
        u16 status;
        int entry = 0;          /*lp->cur_tx & TX_RING_MOD_MASK; */

        status = 0x8300;
        /* point to the current txb incase multiple tx_rings are used */
        ptxb = pcnet32_bufs.txb[lp->cur_tx];

        /* copy the packet to ring buffer */
        memcpy(ptxb, d, ETH_ALEN);      /* dst */
        memcpy(ptxb + ETH_ALEN, nic->node_addr, ETH_ALEN);      /* src */
        nstype = htons((u16) t);        /* type */
        memcpy(ptxb + 2 * ETH_ALEN, (u8 *) & nstype, 2);        /* type */
        memcpy(ptxb + ETH_HLEN, p, s);

        s += ETH_HLEN;
        while (s < ETH_ZLEN)    /* pad to min length */
                ptxb[s++] = '\0';

        pcnet32_bufs.tx_ring[entry].length = le16_to_cpu(-s);
        pcnet32_bufs.tx_ring[entry].misc = 0x00000000;
        pcnet32_bufs.tx_ring[entry].base = (u32) virt_to_le32desc(ptxb);

        /* we set the top byte as the very last thing */
        pcnet32_bufs.tx_ring[entry].status = le16_to_cpu(status);


        /* Trigger an immediate send poll */
        lp->a.write_csr(ioaddr, 0, 0x0048);

        /* wait for transmit complete */
        lp->cur_tx = 0;         /* (lp->cur_tx + 1); */
        time = currticks() + TICKS_PER_SEC;     /* wait one second */
        while (currticks() < time &&
               ((short) le16_to_cpu(pcnet32_bufs.tx_ring[entry].status) < 0));

        if ((short) le16_to_cpu(pcnet32_bufs.tx_ring[entry].status) < 0)
                printf("PCNET32 timed out on transmit\n");

        /* Stop pointing at the current txb
         * otherwise the card continues to send the packet */
        pcnet32_bufs.tx_ring[entry].base = 0;

}

/**************************************************************************
DISABLE - Turn off ethernet interface
***************************************************************************/
static void pcnet32_disable ( struct nic *nic __unused ) {
        /* Stop the PCNET32 here -- it ocassionally polls memory if we don't */
        lp->a.write_csr(ioaddr, 0, 0x0004);

        /*
         * Switch back to 16-bit mode to avoid problems with dumb 
         * DOS packet driver after a warm reboot
         */
        lp->a.write_bcr(ioaddr, 20, 0);
}

/**************************************************************************
IRQ - Enable, Disable, or Force interrupts
***************************************************************************/
static void pcnet32_irq(struct nic *nic __unused, irq_action_t action __unused)
{
  switch ( action ) {
  case DISABLE :
    break;
  case ENABLE :
    break;
  case FORCE :
    break;
  }
}


/**************************************************************************
PROBE - Look for an adapter, this routine's visible to the outside
You should omit the last argument struct pci_device * for a non-PCI NIC
***************************************************************************/
static int pcnet32_probe ( struct nic *nic, struct pci_device *pci ) {

        int i, media;
        int fdx, mii, fset, dxsuflo, ltint;
        int chip_version;
        struct pcnet32_access *a = NULL;
        char *chipname;
        u8 promaddr[6];
        int shared = 1;

        if (pci->ioaddr == 0)
                return 0;

        /* BASE is used throughout to address the card */
        ioaddr = pci->ioaddr;
        printf("pcnet32.c: Found %s, Vendor=0x%hX Device=0x%hX\n",
               pci->driver_name, pci->vendor, pci->device);

        nic->irqno  = 0;
        nic->ioaddr = pci->ioaddr & ~3;

        /* reset the chip */
        pcnet32_wio_reset(ioaddr);

        /* NOTE: 16-bit check is first, otherwise some older PCnet chips fail */
        if (pcnet32_wio_read_csr(ioaddr, 0) == 4
            && pcnet32_wio_check(ioaddr)) {
                a = &pcnet32_wio;
        } else {
                pcnet32_dwio_reset(ioaddr);
                if (pcnet32_dwio_read_csr(ioaddr, 0) == 4
                    && pcnet32_dwio_check(ioaddr)) {
                        a = &pcnet32_dwio;
                } else
                        return 0;
        }

        chip_version =
            a->read_csr(ioaddr, 88) | (a->read_csr(ioaddr, 89) << 16);

        dprintf(("PCnet chip version is 0x%X\n", chip_version));
        if ((chip_version & 0xfff) != 0x003)
                return 0;

        /* initialize variables */
        fdx = mii = fset = dxsuflo = ltint = 0;
        chip_version = (chip_version >> 12) & 0xffff;

        switch (chip_version) {
        case 0x2420:
                chipname = "PCnet/PCI 79C970";  /* PCI */
                break;
        case 0x2430:
                if (shared)
                        chipname = "PCnet/PCI 79C970";  /* 970 gives the wrong chip id back */
                else
                        chipname = "PCnet/32 79C965";   /* 486/VL bus */
                break;
        case 0x2621:
                chipname = "PCnet/PCI II 79C970A";      /* PCI */
                fdx = 1;
                break;
        case 0x2623:
                chipname = "PCnet/FAST 79C971"; /* PCI */
                fdx = 1;
                mii = 1;
                fset = 1;
                ltint = 1;
                break;
        case 0x2624:
                chipname = "PCnet/FAST+ 79C972";        /* PCI */
                fdx = 1;
                mii = 1;
                fset = 1;
                break;
        case 0x2625:
                chipname = "PCnet/FAST III 79C973";     /* PCI */
                fdx = 1;
                mii = 1;
                break;
        case 0x2626:
                chipname = "PCnet/Home 79C978"; /* PCI */
                fdx = 1;
                /* 
                 * This is based on specs published at www.amd.com.  This section
                 * assumes that a card with a 79C978 wants to go into 1Mb HomePNA
                 * mode.  The 79C978 can also go into standard ethernet, and there
                 * probably should be some sort of module option to select the
                 * mode by which the card should operate
                 */
                /* switch to home wiring mode */
                media = a->read_bcr(ioaddr, 49);

                printf("media reset to %#x.\n", media);
                a->write_bcr(ioaddr, 49, media);
                break;
        case 0x2627:
                chipname = "PCnet/FAST III 79C975";     /* PCI */
                fdx = 1;
                mii = 1;
                break;
        default:
                chipname = "UNKNOWN";
                printf("PCnet version %#x, no PCnet32 chip.\n",
                       chip_version);
                return 0;
        }

        /*
         *  On selected chips turn on the BCR18:NOUFLO bit. This stops transmit
         *  starting until the packet is loaded. Strike one for reliability, lose
         *  one for latency - although on PCI this isnt a big loss. Older chips 
         *  have FIFO's smaller than a packet, so you can't do this.
         */

        if (fset) {
                a->write_bcr(ioaddr, 18,
                             (a->read_bcr(ioaddr, 18) | 0x0800));
                a->write_csr(ioaddr, 80,
                             (a->read_csr(ioaddr, 80) & 0x0C00) | 0x0c00);
                dxsuflo = 1;
                ltint = 1;
        }

        DBG ( "%s at %hX,", chipname, (unsigned int) ioaddr );

        /* read PROM address */
        for (i = 0; i < 6; i++)
                promaddr[i] = inb(ioaddr + i);

        /* Update the nic structure with the MAC Address */
        for (i = 0; i < ETH_ALEN; i++) {
                nic->node_addr[i] = promaddr[i];
        }

        /* Print out some hardware info */
        DBG ( "%s: IO Addr 0x%hX, MAC Addr %s\n ", chipname, (unsigned int) ioaddr,
              eth_ntoa ( nic->node_addr ) );

        /* Set to pci bus master */
        adjust_pci_device(pci);

        /* point to private storage */
        lp = &lpx;

#if EBDEBUG
        if (((chip_version + 1) & 0xfffe) == 0x2624) {  /* Version 0x2623 or 0x2624 */
                i = a->read_csr(ioaddr, 80) & 0x0C00;   /* Check tx_start_pt */
                dprintf(("    tx_start_pt(0x%hX):", i));
                switch (i >> 10) {
                case 0:
                        dprintf(("  20 bytes,"));
                        break;
                case 1:
                        dprintf(("  64 bytes,"));
                        break;
                case 2:
                        dprintf((" 128 bytes,"));
                        break;
                case 3:
                        dprintf(("~220 bytes,"));
                        break;
                }
                i = a->read_bcr(ioaddr, 18);    /* Check Burst/Bus control */
                dprintf((" BCR18(%hX):", i & 0xffff));
                if (i & (1 << 5))
                        dprintf(("BurstWrEn "));
                if (i & (1 << 6))
                        dprintf(("BurstRdEn "));
                if (i & (1 << 7))
                        dprintf(("DWordIO "));
                if (i & (1 << 11))
                        dprintf(("NoUFlow "));
                i = a->read_bcr(ioaddr, 25);
                dprintf(("    SRAMSIZE=0x%hX,", i << 8));
                i = a->read_bcr(ioaddr, 26);
                dprintf((" SRAM_BND=0x%hX,", i << 8));
                i = a->read_bcr(ioaddr, 27);
                if (i & (1 << 14))
                        dprintf(("LowLatRx"));
        }
#endif
        lp->name = chipname;
        lp->shared_irq = shared;
        lp->full_duplex = fdx;
        lp->dxsuflo = dxsuflo;
        lp->ltint = ltint;
        lp->mii = mii;
        /* FIXME: Fix Options for only one card */
        if ((cards_found >= MAX_UNITS)
            || ((unsigned int) options[cards_found] > sizeof(options_mapping)))
                lp->options = PCNET32_PORT_ASEL;
        else
                lp->options = options_mapping[options[cards_found]];

        if (fdx && !(lp->options & PCNET32_PORT_ASEL) &&
            ((cards_found >= MAX_UNITS) || full_duplex[cards_found]))
                lp->options |= PCNET32_PORT_FD;

        if (!a) {
                printf("No access methods\n");
                return 0;
        }

        //  lp->a = *a;
        //  Causes a loader:
        //     bin/blib.a(pcnet32.o)(.text+0x6b6): In function `pcnet32_probe':
        //     drivers/net/pcnet32.c:871: undefined reference to `memcpy'
        //     make: *** [bin/pcnet32.dsk.tmp] Error 1
        //  So we do:
        memcpy ( &lp->a, a, sizeof ( lp->a ) );
        //   To explicity call memcpy.

        /* detect special T1/E1 WAN card by checking for MAC address */
        if (nic->node_addr[0] == 0x00 && nic->node_addr[1] == 0xe0
            && nic->node_addr[2] == 0x75)
                lp->options = PCNET32_PORT_FD | PCNET32_PORT_GPSI;

        lp->init_block.mode = le16_to_cpu(0x0003);      /* Disable Rx and Tx. */
        lp->init_block.tlen_rlen =
            le16_to_cpu(TX_RING_LEN_BITS | RX_RING_LEN_BITS);
        for (i = 0; i < 6; i++)
                lp->init_block.phys_addr[i] = nic->node_addr[i];
        lp->init_block.filter[0] = 0xffffffff;
        lp->init_block.filter[1] = 0xffffffff;
        lp->init_block.rx_ring = virt_to_bus(&pcnet32_bufs.rx_ring);
        lp->init_block.tx_ring = virt_to_bus(&pcnet32_bufs.tx_ring);

        /* switch pcnet32 to 32bit mode */
        a->write_bcr(ioaddr, 20, 2);

        a->write_csr(ioaddr, 1, (virt_to_bus(&lp->init_block)) & 0xffff);
        a->write_csr(ioaddr, 2, (virt_to_bus(&lp->init_block)) >> 16);

        /* 
         * To auto-IRQ we enable the initialization-done and DMA error
         * interrupts. For ISA boards we get a DMA error, but VLB and PCI
         * boards will work.
         */
        /* Trigger an initialization just for the interrupt. */

        
//      a->write_csr(ioaddr, 0, 0x41); 
//      mdelay(1);

        cards_found++;

        /* point to NIC specific routines */
        pcnet32_reset(nic);
        if (mii) {
                int tmp;
                int phy, phy_idx = 0;
                u16 mii_lpa;
                lp->phys[0] = 1;        /* Default Setting */
                for (phy = 1; phy < 32 && phy_idx < MII_CNT; phy++) {
                        int mii_status = mdio_read(nic, phy, MII_BMSR);
                        if (mii_status != 0xffff && mii_status != 0x0000) {
                                lp->phys[phy_idx++] = phy;
                                lp->mii_if.advertising =
                                    mdio_read(nic, phy, MII_ADVERTISE);
                                if ((mii_status & 0x0040) == 0) {
                                  tmp = phy;
                                  dprintf (("MII PHY found at address %d, status " 
                                            "%hX advertising %hX\n", phy, mii_status, 
                                            lp->mii_if.advertising));
                                }
                        }
                }
                if (phy_idx == 0)
                        printf("No MII transceiver found!\n");
                lp->mii_if.phy_id = lp->phys[0];

                lp->mii_if.advertising =
                    mdio_read(nic, lp->phys[0], MII_ADVERTISE);

                mii_lpa = mdio_read(nic, lp->phys[0], MII_LPA);
                lp->mii_if.advertising &= mii_lpa;
                if (lp->mii_if.advertising & ADVERTISE_100FULL)
                        printf("100Mbps Full-Duplex\n");
                else if (lp->mii_if.advertising & ADVERTISE_100HALF)
                        printf("100Mbps Half-Duplex\n");
                else if (lp->mii_if.advertising & ADVERTISE_10FULL)
                        printf("10Mbps Full-Duplex\n");
                else if (lp->mii_if.advertising & ADVERTISE_10HALF)
                        printf("10Mbps Half-Duplex\n");
                else
                        printf("\n");
        } else {
                /* The older chips are fixed 10Mbps, and some support full duplex,
                 * although not via autonegotiation, but only via configuration.  */
                if (fdx)
                        printf("10Mbps Full-Duplex\n");
                else
                        printf("10Mbps Half-Duplex\n");
        }

        nic->nic_op     = &pcnet32_operations;

        return 1;
}
static int mdio_read(struct nic *nic __unused, int phy_id, int reg_num)
{
        u16 val_out;
        int phyaddr;

        if (!lp->mii)
                return 0;

        phyaddr = lp->a.read_bcr(ioaddr, 33);

        lp->a.write_bcr(ioaddr, 33,
                        ((phy_id & 0x1f) << 5) | (reg_num & 0x1f));
        val_out = lp->a.read_bcr(ioaddr, 34);
        lp->a.write_bcr(ioaddr, 33, phyaddr);

        return val_out;
}

#if 0
static void mdio_write(struct nic *nic __unused, int phy_id, int reg_num,
                       int val)
{
        int phyaddr;

        if (!lp->mii)
                return;

        phyaddr = lp->a.read_bcr(ioaddr, 33);

        lp->a.write_bcr(ioaddr, 33,
                        ((phy_id & 0x1f) << 5) | (reg_num & 0x1f));
        lp->a.write_bcr(ioaddr, 34, val);
        lp->a.write_bcr(ioaddr, 33, phyaddr);
}
#endif

static struct nic_operations pcnet32_operations = {
        .connect        = dummy_connect,
        .poll           = pcnet32_poll,
        .transmit       = pcnet32_transmit,
        .irq            = pcnet32_irq,

};

static struct pci_device_id pcnet32_nics[] = {
        PCI_ROM(0x1022, 0x2000, "pcnet32", "AMD PCnet/PCI", 0),
        PCI_ROM(0x1022, 0x2625, "pcnetfastiii", "AMD PCNet FAST III", 0),
        PCI_ROM(0x1022, 0x2001, "amdhomepna", "AMD PCnet/HomePNA", 0),
};

PCI_DRIVER ( pcnet32_driver, pcnet32_nics, PCI_NO_CLASS );

DRIVER ( "PCNET32/PCI", nic_driver, pci_driver, pcnet32_driver,
         pcnet32_probe, pcnet32_disable );

/*
 * Local variables:
 *  c-basic-offset: 8
 *  c-indent-level: 8
 *  tab-width: 8
 * End:
 */