ariadne.c

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/*
 *  Amiga Linux/m68k Ariadne Ethernet Driver
 *
 *  © Copyright 1995-2003 by Geert Uytterhoeven ([email protected])
 *               Peter De Schrijver ([email protected])
 *
 *  ---------------------------------------------------------------------------
 *
 *  This program is based on
 *
 *  lance.c:    An AMD LANCE ethernet driver for linux.
 *          Written 1993-94 by Donald Becker.
 *
 *  Am79C960:   PCnet(tm)-ISA Single-Chip Ethernet Controller
 *          Advanced Micro Devices
 *          Publication #16907, Rev. B, Amendment/0, May 1994
 *
 *  MC68230:    Parallel Interface/Timer (PI/T)
 *          Motorola Semiconductors, December, 1983
 *
 *  ---------------------------------------------------------------------------
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of the Linux
 *  distribution for more details.
 *
 *  ---------------------------------------------------------------------------
 *
 *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
 *
 *  - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
 *    10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
 *
 *  - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
/*#define DEBUG*/

#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/zorro.h>
#include <linux/bitops.h>

#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

#include "ariadne.h"

#ifdef ARIADNE_DEBUG
int ariadne_debug = ARIADNE_DEBUG;
#else
int ariadne_debug = 1;
#endif

/* Macros to Fix Endianness problems */

/* Swap the Bytes in a WORD */
#define swapw(x)    (((x >> 8) & 0x00ff) | ((x << 8) & 0xff00))
/* Get the Low BYTE in a WORD */
#define lowb(x)     (x & 0xff)
/* Get the Swapped High WORD in a LONG */
#define swhighw(x)  ((((x) >> 8) & 0xff00) | (((x) >> 24) & 0x00ff))
/* Get the Swapped Low WORD in a LONG */
#define swloww(x)   ((((x) << 8) & 0xff00) | (((x) >> 8) & 0x00ff))

/* Transmit/Receive Ring Definitions */

#define TX_RING_SIZE    5
#define RX_RING_SIZE    16

#define PKT_BUF_SIZE    1520

/* Private Device Data */

struct ariadne_private {
    volatile struct TDRE *tx_ring[TX_RING_SIZE];
    volatile struct RDRE *rx_ring[RX_RING_SIZE];
    volatile u_short *tx_buff[TX_RING_SIZE];
    volatile u_short *rx_buff[RX_RING_SIZE];
    int cur_tx, cur_rx;     /* The next free ring entry */
    int dirty_tx;           /* The ring entries to be free()ed */
    char tx_full;
};

/* Structure Created in the Ariadne's RAM Buffer */

struct lancedata {
    struct TDRE tx_ring[TX_RING_SIZE];
    struct RDRE rx_ring[RX_RING_SIZE];
    u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE / sizeof(u_short)];
    u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE / sizeof(u_short)];
};

static void memcpyw(volatile u_short *dest, u_short *src, int len)
{
    while (len >= 2) {
        *(dest++) = *(src++);
        len -= 2;
    }
    if (len == 1)
        *dest = (*(u_char *)src) << 8;
}

static void ariadne_init_ring(struct net_device *dev)
{
    struct ariadne_private *priv = netdev_priv(dev);
    volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
    int i;

    netif_stop_queue(dev);

    priv->tx_full = 0;
    priv->cur_rx = priv->cur_tx = 0;
    priv->dirty_tx = 0;

    /* Set up TX Ring */
    for (i = 0; i < TX_RING_SIZE; i++) {
        volatile struct TDRE *t = &lancedata->tx_ring[i];
        t->TMD0 = swloww(ARIADNE_RAM +
                 offsetof(struct lancedata, tx_buff[i]));
        t->TMD1 = swhighw(ARIADNE_RAM +
                  offsetof(struct lancedata, tx_buff[i])) |
            TF_STP | TF_ENP;
        t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
        t->TMD3 = 0;
        priv->tx_ring[i] = &lancedata->tx_ring[i];
        priv->tx_buff[i] = lancedata->tx_buff[i];
        netdev_dbg(dev, "TX Entry %2d at %p, Buf at %p\n",
               i, &lancedata->tx_ring[i], lancedata->tx_buff[i]);
    }

    /* Set up RX Ring */
    for (i = 0; i < RX_RING_SIZE; i++) {
        volatile struct RDRE *r = &lancedata->rx_ring[i];
        r->RMD0 = swloww(ARIADNE_RAM +
                 offsetof(struct lancedata, rx_buff[i]));
        r->RMD1 = swhighw(ARIADNE_RAM +
                  offsetof(struct lancedata, rx_buff[i])) |
            RF_OWN;
        r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
        r->RMD3 = 0x0000;
        priv->rx_ring[i] = &lancedata->rx_ring[i];
        priv->rx_buff[i] = lancedata->rx_buff[i];
        netdev_dbg(dev, "RX Entry %2d at %p, Buf at %p\n",
               i, &lancedata->rx_ring[i], lancedata->rx_buff[i]);
    }
}

static int ariadne_rx(struct net_device *dev)
{
    struct ariadne_private *priv = netdev_priv(dev);
    int entry = priv->cur_rx % RX_RING_SIZE;
    int i;

    /* If we own the next entry, it's a new packet. Send it up */
    while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
        int status = lowb(priv->rx_ring[entry]->RMD1);

        if (status != (RF_STP | RF_ENP)) {  /* There was an error */
            /* There is a tricky error noted by
             * John Murphy <[email protected]> to Russ Nelson:
             * Even with full-sized buffers it's possible for a
             * jabber packet to use two buffers, with only the
             * last correctly noting the error
             */
            /* Only count a general error at the end of a packet */
            if (status & RF_ENP)
                dev->stats.rx_errors++;
            if (status & RF_FRAM)
                dev->stats.rx_frame_errors++;
            if (status & RF_OFLO)
                dev->stats.rx_over_errors++;
            if (status & RF_CRC)
                dev->stats.rx_crc_errors++;
            if (status & RF_BUFF)
                dev->stats.rx_fifo_errors++;
            priv->rx_ring[entry]->RMD1 &= 0xff00 | RF_STP | RF_ENP;
        } else {
            /* Malloc up new buffer, compatible with net-3 */
            short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
            struct sk_buff *skb;

            skb = netdev_alloc_skb(dev, pkt_len + 2);
            if (skb == NULL) {
                netdev_warn(dev, "Memory squeeze, deferring packet\n");
                for (i = 0; i < RX_RING_SIZE; i++)
                    if (lowb(priv->rx_ring[(entry + i) % RX_RING_SIZE]->RMD1) & RF_OWN)
                        break;

                if (i > RX_RING_SIZE - 2) {
                    dev->stats.rx_dropped++;
                    priv->rx_ring[entry]->RMD1 |= RF_OWN;
                    priv->cur_rx++;
                }
                break;
            }


            skb_reserve(skb, 2);    /* 16 byte align */
            skb_put(skb, pkt_len);  /* Make room */
            skb_copy_to_linear_data(skb,
                        (const void *)priv->rx_buff[entry],
                        pkt_len);
            skb->protocol = eth_type_trans(skb, dev);
            netdev_dbg(dev, "RX pkt type 0x%04x from %pM to %pM data %p len %u\n",
                   ((u_short *)skb->data)[6],
                   skb->data + 6, skb->data,
                   skb->data, skb->len);

            netif_rx(skb);
            dev->stats.rx_packets++;
            dev->stats.rx_bytes += pkt_len;
        }

        priv->rx_ring[entry]->RMD1 |= RF_OWN;
        entry = (++priv->cur_rx) % RX_RING_SIZE;
    }

    priv->cur_rx = priv->cur_rx % RX_RING_SIZE;

    /* We should check that at least two ring entries are free.
     * If not, we should free one and mark stats->rx_dropped++
     */

    return 0;
}

static irqreturn_t ariadne_interrupt(int irq, void *data)
{
    struct net_device *dev = (struct net_device *)data;
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
    struct ariadne_private *priv;
    int csr0, boguscnt;
    int handled = 0;

    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */

    if (!(lance->RDP & INTR))   /* Check if any interrupt has been */
        return IRQ_NONE;    /* generated by the board */

    priv = netdev_priv(dev);

    boguscnt = 10;
    while ((csr0 = lance->RDP) & (ERR | RINT | TINT) && --boguscnt >= 0) {
        /* Acknowledge all of the current interrupt sources ASAP */
        lance->RDP = csr0 & ~(INEA | TDMD | STOP | STRT | INIT);

#ifdef DEBUG
        if (ariadne_debug > 5) {
            netdev_dbg(dev, "interrupt  csr0=%#02x new csr=%#02x [",
                   csr0, lance->RDP);
            if (csr0 & INTR)
                pr_cont(" INTR");
            if (csr0 & INEA)
                pr_cont(" INEA");
            if (csr0 & RXON)
                pr_cont(" RXON");
            if (csr0 & TXON)
                pr_cont(" TXON");
            if (csr0 & TDMD)
                pr_cont(" TDMD");
            if (csr0 & STOP)
                pr_cont(" STOP");
            if (csr0 & STRT)
                pr_cont(" STRT");
            if (csr0 & INIT)
                pr_cont(" INIT");
            if (csr0 & ERR)
                pr_cont(" ERR");
            if (csr0 & BABL)
                pr_cont(" BABL");
            if (csr0 & CERR)
                pr_cont(" CERR");
            if (csr0 & MISS)
                pr_cont(" MISS");
            if (csr0 & MERR)
                pr_cont(" MERR");
            if (csr0 & RINT)
                pr_cont(" RINT");
            if (csr0 & TINT)
                pr_cont(" TINT");
            if (csr0 & IDON)
                pr_cont(" IDON");
            pr_cont(" ]\n");
        }
#endif

        if (csr0 & RINT) {  /* Rx interrupt */
            handled = 1;
            ariadne_rx(dev);
        }

        if (csr0 & TINT) {  /* Tx-done interrupt */
            int dirty_tx = priv->dirty_tx;

            handled = 1;
            while (dirty_tx < priv->cur_tx) {
                int entry = dirty_tx % TX_RING_SIZE;
                int status = lowb(priv->tx_ring[entry]->TMD1);

                if (status & TF_OWN)
                    break;  /* It still hasn't been Txed */

                priv->tx_ring[entry]->TMD1 &= 0xff00;

                if (status & TF_ERR) {
                    /* There was an major error, log it */
                    int err_status = priv->tx_ring[entry]->TMD3;
                    dev->stats.tx_errors++;
                    if (err_status & EF_RTRY)
                        dev->stats.tx_aborted_errors++;
                    if (err_status & EF_LCAR)
                        dev->stats.tx_carrier_errors++;
                    if (err_status & EF_LCOL)
                        dev->stats.tx_window_errors++;
                    if (err_status & EF_UFLO) {
                        /* Ackk!  On FIFO errors the Tx unit is turned off! */
                        dev->stats.tx_fifo_errors++;
                        /* Remove this verbosity later! */
                        netdev_err(dev, "Tx FIFO error! Status %04x\n",
                               csr0);
                        /* Restart the chip */
                        lance->RDP = STRT;
                    }
                } else {
                    if (status & (TF_MORE | TF_ONE))
                        dev->stats.collisions++;
                    dev->stats.tx_packets++;
                }
                dirty_tx++;
            }

#ifndef final_version
            if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
                netdev_err(dev, "out-of-sync dirty pointer, %d vs. %d, full=%d\n",
                       dirty_tx, priv->cur_tx,
                       priv->tx_full);
                dirty_tx += TX_RING_SIZE;
            }
#endif

            if (priv->tx_full && netif_queue_stopped(dev) &&
                dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
                /* The ring is no longer full */
                priv->tx_full = 0;
                netif_wake_queue(dev);
            }

            priv->dirty_tx = dirty_tx;
        }

        /* Log misc errors */
        if (csr0 & BABL) {
            handled = 1;
            dev->stats.tx_errors++; /* Tx babble */
        }
        if (csr0 & MISS) {
            handled = 1;
            dev->stats.rx_errors++; /* Missed a Rx frame */
        }
        if (csr0 & MERR) {
            handled = 1;
            netdev_err(dev, "Bus master arbitration failure, status %04x\n",
                   csr0);
            /* Restart the chip */
            lance->RDP = STRT;
        }
    }

    /* Clear any other interrupt, and set interrupt enable */
    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = INEA | BABL | CERR | MISS | MERR | IDON;

    if (ariadne_debug > 4)
        netdev_dbg(dev, "exiting interrupt, csr%d=%#04x\n",
               lance->RAP, lance->RDP);

    return IRQ_RETVAL(handled);
}

static int ariadne_open(struct net_device *dev)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
    u_short in;
    u_long version;
    int i;

    /* Reset the LANCE */
    in = lance->Reset;

    /* Stop the LANCE */
    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = STOP;

    /* Check the LANCE version */
    lance->RAP = CSR88;     /* Chip ID */
    version = swapw(lance->RDP);
    lance->RAP = CSR89;     /* Chip ID */
    version |= swapw(lance->RDP) << 16;
    if ((version & 0x00000fff) != 0x00000003) {
        pr_warn("Couldn't find AMD Ethernet Chip\n");
        return -EAGAIN;
    }
    if ((version & 0x0ffff000) != 0x00003000) {
        pr_warn("Couldn't find Am79C960 (Wrong part number = %ld)\n",
               (version & 0x0ffff000) >> 12);
        return -EAGAIN;
    }

    netdev_dbg(dev, "Am79C960 (PCnet-ISA) Revision %ld\n",
           (version & 0xf0000000) >> 28);

    ariadne_init_ring(dev);

    /* Miscellaneous Stuff */
    lance->RAP = CSR3;      /* Interrupt Masks and Deferral Control */
    lance->RDP = 0x0000;
    lance->RAP = CSR4;      /* Test and Features Control */
    lance->RDP = DPOLL | APAD_XMT | MFCOM | RCVCCOM | TXSTRTM | JABM;

    /* Set the Multicast Table */
    lance->RAP = CSR8;      /* Logical Address Filter, LADRF[15:0] */
    lance->RDP = 0x0000;
    lance->RAP = CSR9;      /* Logical Address Filter, LADRF[31:16] */
    lance->RDP = 0x0000;
    lance->RAP = CSR10;     /* Logical Address Filter, LADRF[47:32] */
    lance->RDP = 0x0000;
    lance->RAP = CSR11;     /* Logical Address Filter, LADRF[63:48] */
    lance->RDP = 0x0000;

    /* Set the Ethernet Hardware Address */
    lance->RAP = CSR12;     /* Physical Address Register, PADR[15:0] */
    lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
    lance->RAP = CSR13;     /* Physical Address Register, PADR[31:16] */
    lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
    lance->RAP = CSR14;     /* Physical Address Register, PADR[47:32] */
    lance->RDP = ((u_short *)&dev->dev_addr[0])[2];

    /* Set the Init Block Mode */
    lance->RAP = CSR15;     /* Mode Register */
    lance->RDP = 0x0000;

    /* Set the Transmit Descriptor Ring Pointer */
    lance->RAP = CSR30;     /* Base Address of Transmit Ring */
    lance->RDP = swloww(ARIADNE_RAM + offsetof(struct lancedata, tx_ring));
    lance->RAP = CSR31;     /* Base Address of transmit Ring */
    lance->RDP = swhighw(ARIADNE_RAM + offsetof(struct lancedata, tx_ring));

    /* Set the Receive Descriptor Ring Pointer */
    lance->RAP = CSR24;     /* Base Address of Receive Ring */
    lance->RDP = swloww(ARIADNE_RAM + offsetof(struct lancedata, rx_ring));
    lance->RAP = CSR25;     /* Base Address of Receive Ring */
    lance->RDP = swhighw(ARIADNE_RAM + offsetof(struct lancedata, rx_ring));

    /* Set the Number of RX and TX Ring Entries */
    lance->RAP = CSR76;     /* Receive Ring Length */
    lance->RDP = swapw(((u_short)-RX_RING_SIZE));
    lance->RAP = CSR78;     /* Transmit Ring Length */
    lance->RDP = swapw(((u_short)-TX_RING_SIZE));

    /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
    lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
    lance->IDP = ASEL;

    /* LED Control */
    lance->RAP = ISACSR5;       /* LED1 Status */
    lance->IDP = PSE|XMTE;
    lance->RAP = ISACSR6;   /* LED2 Status */
    lance->IDP = PSE|COLE;
    lance->RAP = ISACSR7;   /* LED3 Status */
    lance->IDP = PSE|RCVE;

    netif_start_queue(dev);

    i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
            dev->name, dev);
    if (i)
        return i;

    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = INEA | STRT;

    return 0;
}

static int ariadne_close(struct net_device *dev)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;

    netif_stop_queue(dev);

    lance->RAP = CSR112;        /* Missed Frame Count */
    dev->stats.rx_missed_errors = swapw(lance->RDP);
    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */

    if (ariadne_debug > 1) {
        netdev_dbg(dev, "Shutting down ethercard, status was %02x\n",
               lance->RDP);
        netdev_dbg(dev, "%lu packets missed\n",
               dev->stats.rx_missed_errors);
    }

    /* We stop the LANCE here -- it occasionally polls memory if we don't */
    lance->RDP = STOP;

    free_irq(IRQ_AMIGA_PORTS, dev);

    return 0;
}

static inline void ariadne_reset(struct net_device *dev)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;

    lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
    lance->RDP = STOP;
    ariadne_init_ring(dev);
    lance->RDP = INEA | STRT;
    netif_start_queue(dev);
}

static void ariadne_tx_timeout(struct net_device *dev)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;

    netdev_err(dev, "transmit timed out, status %04x, resetting\n",
           lance->RDP);
    ariadne_reset(dev);
    netif_wake_queue(dev);
}

static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
                      struct net_device *dev)
{
    struct ariadne_private *priv = netdev_priv(dev);
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
    int entry;
    unsigned long flags;
    int len = skb->len;

#if 0
    if (ariadne_debug > 3) {
        lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
        netdev_dbg(dev, "%s: csr0 %04x\n", __func__, lance->RDP);
        lance->RDP = 0x0000;
    }
#endif

    /* FIXME: is the 79C960 new enough to do its own padding right ? */
    if (skb->len < ETH_ZLEN) {
        if (skb_padto(skb, ETH_ZLEN))
            return NETDEV_TX_OK;
        len = ETH_ZLEN;
    }

    /* Fill in a Tx ring entry */

    netdev_dbg(dev, "TX pkt type 0x%04x from %pM to %pM data %p len %u\n",
           ((u_short *)skb->data)[6],
           skb->data + 6, skb->data,
           skb->data, skb->len);

    local_irq_save(flags);

    entry = priv->cur_tx % TX_RING_SIZE;

    /* Caution: the write order is important here, set the base address with
       the "ownership" bits last */

    priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
    priv->tx_ring[entry]->TMD3 = 0x0000;
    memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);

#ifdef DEBUG
    print_hex_dump(KERN_DEBUG, "tx_buff: ", DUMP_PREFIX_OFFSET, 16, 1,
               (void *)priv->tx_buff[entry],
               skb->len > 64 ? 64 : skb->len, true);
#endif

    priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1 & 0xff00)
        | TF_OWN | TF_STP | TF_ENP;

    dev_kfree_skb(skb);

    priv->cur_tx++;
    if ((priv->cur_tx >= TX_RING_SIZE) &&
        (priv->dirty_tx >= TX_RING_SIZE)) {

        netdev_dbg(dev, "*** Subtracting TX_RING_SIZE from cur_tx (%d) and dirty_tx (%d)\n",
               priv->cur_tx, priv->dirty_tx);

        priv->cur_tx -= TX_RING_SIZE;
        priv->dirty_tx -= TX_RING_SIZE;
    }
    dev->stats.tx_bytes += len;

    /* Trigger an immediate send poll */
    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = INEA | TDMD;

    if (lowb(priv->tx_ring[(entry + 1) % TX_RING_SIZE]->TMD1) != 0) {
        netif_stop_queue(dev);
        priv->tx_full = 1;
    }
    local_irq_restore(flags);

    return NETDEV_TX_OK;
}

static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
    short saved_addr;
    unsigned long flags;

    local_irq_save(flags);
    saved_addr = lance->RAP;
    lance->RAP = CSR112;        /* Missed Frame Count */
    dev->stats.rx_missed_errors = swapw(lance->RDP);
    lance->RAP = saved_addr;
    local_irq_restore(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)
{
    volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;

    if (!netif_running(dev))
        return;

    netif_stop_queue(dev);

    /* We take the simple way out and always enable promiscuous mode */
    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = STOP;      /* Temporarily stop the lance */
    ariadne_init_ring(dev);

    if (dev->flags & IFF_PROMISC) {
        lance->RAP = CSR15; /* Mode Register */
        lance->RDP = PROM;  /* Set promiscuous mode */
    } else {
        short multicast_table[4];
        int num_addrs = netdev_mc_count(dev);
        int i;
        /* We don't use the multicast table,
         * but rely on upper-layer filtering
         */
        memset(multicast_table, (num_addrs == 0) ? 0 : -1,
               sizeof(multicast_table));
        for (i = 0; i < 4; i++) {
            lance->RAP = CSR8 + (i << 8);
                    /* Logical Address Filter */
            lance->RDP = swapw(multicast_table[i]);
        }
        lance->RAP = CSR15; /* Mode Register */
        lance->RDP = 0x0000;    /* Unset promiscuous mode */
    }

    lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
    lance->RDP = INEA | STRT | IDON;/* Resume normal operation */

    netif_wake_queue(dev);
}


static void __devexit ariadne_remove_one(struct zorro_dev *z)
{
    struct net_device *dev = zorro_get_drvdata(z);

    unregister_netdev(dev);
    release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
    release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
    free_netdev(dev);
}

static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
    { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
    { 0 }
};
MODULE_DEVICE_TABLE(zorro, ariadne_zorro_tbl);

static const struct net_device_ops ariadne_netdev_ops = {
    .ndo_open       = ariadne_open,
    .ndo_stop       = ariadne_close,
    .ndo_start_xmit     = ariadne_start_xmit,
    .ndo_tx_timeout     = ariadne_tx_timeout,
    .ndo_get_stats      = ariadne_get_stats,
    .ndo_set_rx_mode    = set_multicast_list,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_mac_address    = eth_mac_addr,
};

static int __devinit ariadne_init_one(struct zorro_dev *z,
                      const struct zorro_device_id *ent)
{
    unsigned long board = z->resource.start;
    unsigned long base_addr = board + ARIADNE_LANCE;
    unsigned long mem_start = board + ARIADNE_RAM;
    struct resource *r1, *r2;
    struct net_device *dev;
    struct ariadne_private *priv;
    int err;

    r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
    if (!r1)
        return -EBUSY;
    r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
    if (!r2) {
        release_mem_region(base_addr, sizeof(struct Am79C960));
        return -EBUSY;
    }

    dev = alloc_etherdev(sizeof(struct ariadne_private));
    if (dev == NULL) {
        release_mem_region(base_addr, sizeof(struct Am79C960));
        release_mem_region(mem_start, ARIADNE_RAM_SIZE);
        return -ENOMEM;
    }

    priv = netdev_priv(dev);

    r1->name = dev->name;
    r2->name = dev->name;

    dev->dev_addr[0] = 0x00;
    dev->dev_addr[1] = 0x60;
    dev->dev_addr[2] = 0x30;
    dev->dev_addr[3] = (z->rom.er_SerialNumber >> 16) & 0xff;
    dev->dev_addr[4] = (z->rom.er_SerialNumber >> 8) & 0xff;
    dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
    dev->base_addr = ZTWO_VADDR(base_addr);
    dev->mem_start = ZTWO_VADDR(mem_start);
    dev->mem_end = dev->mem_start + ARIADNE_RAM_SIZE;

    dev->netdev_ops = &ariadne_netdev_ops;
    dev->watchdog_timeo = 5 * HZ;

    err = register_netdev(dev);
    if (err) {
        release_mem_region(base_addr, sizeof(struct Am79C960));
        release_mem_region(mem_start, ARIADNE_RAM_SIZE);
        free_netdev(dev);
        return err;
    }
    zorro_set_drvdata(z, dev);

    netdev_info(dev, "Ariadne at 0x%08lx, Ethernet Address %pM\n",
            board, dev->dev_addr);

    return 0;
}

static struct zorro_driver ariadne_driver = {
    .name       = "ariadne",
    .id_table   = ariadne_zorro_tbl,
    .probe      = ariadne_init_one,
    .remove     = __devexit_p(ariadne_remove_one),
};

static int __init ariadne_init_module(void)
{
    return zorro_register_driver(&ariadne_driver);
}

static void __exit ariadne_cleanup_module(void)
{
    zorro_unregister_driver(&ariadne_driver);
}

module_init(ariadne_init_module);
module_exit(ariadne_cleanup_module);

MODULE_LICENSE("GPL");