/*
 * Amiga Linux/68k A2065 Ethernet Driver
 *
 * (C) Copyright 1995-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
 *
 * Fixes and tips by:
 *      - Janos Farkas (CHEXUM@sparta.banki.hu)
 *      - Jes Degn Soerensen (jds@kom.auc.dk)
 *      - Matt Domsch (Matt_Domsch@dell.com)
 *
 * ----------------------------------------------------------------------------
 *
 * This program is based on
 *
 *      ariadne.?:      Amiga Linux/68k Ariadne Ethernet Driver
 *                      (C) Copyright 1995 by Geert Uytterhoeven,
 *                                            Peter De Schrijver
 *
 *      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
 *
 * ----------------------------------------------------------------------------
 *
 * 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 A2065 is a Zorro-II board made by Commodore/Ameristar. It contains:
 *
 *      - an Am7990 Local Area Network Controller for Ethernet (LANCE) with
 *        both 10BASE-2 (thin coax) and AUI (DB-15) connectors
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

/*#define DEBUG*/
/*#define TEST_HITS*/

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/zorro.h>
#include <linux/bitops.h>

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

#include "a2065.h"

/* Transmit/Receive Ring Definitions */

#define LANCE_LOG_TX_BUFFERS    (2)
#define LANCE_LOG_RX_BUFFERS    (4)

#define TX_RING_SIZE            (1 << LANCE_LOG_TX_BUFFERS)
#define RX_RING_SIZE            (1 << LANCE_LOG_RX_BUFFERS)

#define TX_RING_MOD_MASK        (TX_RING_SIZE - 1)
#define RX_RING_MOD_MASK        (RX_RING_SIZE - 1)

#define PKT_BUF_SIZE            (1544)
#define RX_BUFF_SIZE            PKT_BUF_SIZE
#define TX_BUFF_SIZE            PKT_BUF_SIZE

/* Layout of the Lance's RAM Buffer */

struct lance_init_block {
        unsigned short mode;            /* Pre-set mode (reg. 15) */
        unsigned char phys_addr[6];     /* Physical ethernet address */
        unsigned filter[2];             /* Multicast filter. */

        /* Receive and transmit ring base, along with extra bits. */
        unsigned short rx_ptr;          /* receive descriptor addr */
        unsigned short rx_len;          /* receive len and high addr */
        unsigned short tx_ptr;          /* transmit descriptor addr */
        unsigned short tx_len;          /* transmit len and high addr */

        /* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
        struct lance_rx_desc brx_ring[RX_RING_SIZE];
        struct lance_tx_desc btx_ring[TX_RING_SIZE];

        char rx_buf[RX_RING_SIZE][RX_BUFF_SIZE];
        char tx_buf[TX_RING_SIZE][TX_BUFF_SIZE];
};

/* Private Device Data */

struct lance_private {
        char *name;
        volatile struct lance_regs *ll;
        volatile struct lance_init_block *init_block;       /* Hosts view */
        volatile struct lance_init_block *lance_init_block; /* Lance view */

        int rx_new, tx_new;
        int rx_old, tx_old;

        int lance_log_rx_bufs, lance_log_tx_bufs;
        int rx_ring_mod_mask, tx_ring_mod_mask;

        int tpe;                      /* cable-selection is TPE */
        int auto_select;              /* cable-selection by carrier */
        unsigned short busmaster_regval;

#ifdef CONFIG_SUNLANCE
        struct Linux_SBus_DMA *ledma; /* if set this points to ledma and arch=4m */
        int burst_sizes;              /* ledma SBus burst sizes */
#endif
        struct timer_list         multicast_timer;
};

#define LANCE_ADDR(x) ((int)(x) & ~0xff000000)

/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
        volatile struct lance_regs *ll = lp->ll;
        volatile struct lance_init_block *aib = lp->lance_init_block;
        int leptr = LANCE_ADDR(aib);

        ll->rap = LE_CSR1;
        ll->rdp = (leptr & 0xFFFF);
        ll->rap = LE_CSR2;
        ll->rdp = leptr >> 16;
        ll->rap = LE_CSR3;
        ll->rdp = lp->busmaster_regval;

        /* Point back to csr0 */
        ll->rap = LE_CSR0;
}

/* Setup the Lance Rx and Tx rings */
static void lance_init_ring(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_init_block *ib = lp->init_block;
        volatile struct lance_init_block *aib = lp->lance_init_block;
                                        /* for LANCE_ADDR computations */
        int leptr;
        int i;

        /* Lock out other processes while setting up hardware */
        netif_stop_queue(dev);
        lp->rx_new = lp->tx_new = 0;
        lp->rx_old = lp->tx_old = 0;

        ib->mode = 0;

        /* Copy the ethernet address to the lance init block
         * Note that on the sparc you need to swap the ethernet address.
         */
        ib->phys_addr[0] = dev->dev_addr[1];
        ib->phys_addr[1] = dev->dev_addr[0];
        ib->phys_addr[2] = dev->dev_addr[3];
        ib->phys_addr[3] = dev->dev_addr[2];
        ib->phys_addr[4] = dev->dev_addr[5];
        ib->phys_addr[5] = dev->dev_addr[4];

        /* Setup the Tx ring entries */
        netdev_dbg(dev, "TX rings:\n");
        for (i = 0; i <= 1 << lp->lance_log_tx_bufs; i++) {
                leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
                ib->btx_ring[i].tmd0      = leptr;
                ib->btx_ring[i].tmd1_hadr = leptr >> 16;
                ib->btx_ring[i].tmd1_bits = 0;
                ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
                ib->btx_ring[i].misc      = 0;
                if (i < 3)
                        netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
        }

        /* Setup the Rx ring entries */
        netdev_dbg(dev, "RX rings:\n");
        for (i = 0; i < 1 << lp->lance_log_rx_bufs; i++) {
                leptr = LANCE_ADDR(&aib->rx_buf[i][0]);

                ib->brx_ring[i].rmd0      = leptr;
                ib->brx_ring[i].rmd1_hadr = leptr >> 16;
                ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
                ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
                ib->brx_ring[i].mblength  = 0;
                if (i < 3)
                        netdev_dbg(dev, "%d: 0x%08x\n", i, leptr);
        }

        /* Setup the initialization block */

        /* Setup rx descriptor pointer */
        leptr = LANCE_ADDR(&aib->brx_ring);
        ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
        ib->rx_ptr = leptr;
        netdev_dbg(dev, "RX ptr: %08x\n", leptr);

        /* Setup tx descriptor pointer */
        leptr = LANCE_ADDR(&aib->btx_ring);
        ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
        ib->tx_ptr = leptr;
        netdev_dbg(dev, "TX ptr: %08x\n", leptr);

        /* Clear the multicast filter */
        ib->filter[0] = 0;
        ib->filter[1] = 0;
}

static int init_restart_lance(struct lance_private *lp)
{
        volatile struct lance_regs *ll = lp->ll;
        int i;

        ll->rap = LE_CSR0;
        ll->rdp = LE_C0_INIT;

        /* Wait for the lance to complete initialization */
        for (i = 0; (i < 100) && !(ll->rdp & (LE_C0_ERR | LE_C0_IDON)); i++)
                barrier();
        if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
                pr_err("unopened after %d ticks, csr0=%04x\n", i, ll->rdp);
                return -EIO;
        }

        /* Clear IDON by writing a "1", enable interrupts and start lance */
        ll->rdp = LE_C0_IDON;
        ll->rdp = LE_C0_INEA | LE_C0_STRT;

        return 0;
}

static int lance_rx(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_init_block *ib = lp->init_block;
        volatile struct lance_regs *ll = lp->ll;
        volatile struct lance_rx_desc *rd;
        unsigned char bits;

#ifdef TEST_HITS
        int i;
        char buf[RX_RING_SIZE + 1];

        for (i = 0; i < RX_RING_SIZE; i++) {
                char r1_own = ib->brx_ring[i].rmd1_bits & LE_R1_OWN;
                if (i == lp->rx_new)
                        buf[i] = r1_own ? '_' : 'X';
                else
                        buf[i] = r1_own ? '.' : '1';
        }
        buf[RX_RING_SIZE] = 0;

        pr_debug("RxRing TestHits: [%s]\n", buf);
#endif

        ll->rdp = LE_C0_RINT | LE_C0_INEA;
        for (rd = &ib->brx_ring[lp->rx_new];
             !((bits = rd->rmd1_bits) & LE_R1_OWN);
             rd = &ib->brx_ring[lp->rx_new]) {

                /* We got an incomplete frame? */
                if ((bits & LE_R1_POK) != LE_R1_POK) {
                        dev->stats.rx_over_errors++;
                        dev->stats.rx_errors++;
                        continue;
                } else if (bits & LE_R1_ERR) {
                        /* Count only the end frame as a rx error,
                         * not the beginning
                         */
                        if (bits & LE_R1_BUF)
                                dev->stats.rx_fifo_errors++;
                        if (bits & LE_R1_CRC)
                                dev->stats.rx_crc_errors++;
                        if (bits & LE_R1_OFL)
                                dev->stats.rx_over_errors++;
                        if (bits & LE_R1_FRA)
                                dev->stats.rx_frame_errors++;
                        if (bits & LE_R1_EOP)
                                dev->stats.rx_errors++;
                } else {
                        int len = (rd->mblength & 0xfff) - 4;
                        struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);

                        if (!skb) {
                                dev->stats.rx_dropped++;
                                rd->mblength = 0;
                                rd->rmd1_bits = LE_R1_OWN;
                                lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
                                return 0;
                        }

                        skb_reserve(skb, 2);            /* 16 byte align */
                        skb_put(skb, len);              /* make room */
                        skb_copy_to_linear_data(skb,
                                 (unsigned char *)&ib->rx_buf[lp->rx_new][0],
                                 len);
                        skb->protocol = eth_type_trans(skb, dev);
                        netif_rx(skb);
                        dev->stats.rx_packets++;
                        dev->stats.rx_bytes += len;
                }

                /* Return the packet to the pool */
                rd->mblength = 0;
                rd->rmd1_bits = LE_R1_OWN;
                lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
        }
        return 0;
}

static int lance_tx(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_init_block *ib = lp->init_block;
        volatile struct lance_regs *ll = lp->ll;
        volatile struct lance_tx_desc *td;
        int i, j;
        int status;

        /* csr0 is 2f3 */
        ll->rdp = LE_C0_TINT | LE_C0_INEA;
        /* csr0 is 73 */

        j = lp->tx_old;
        for (i = j; i != lp->tx_new; i = j) {
                td = &ib->btx_ring[i];

                /* If we hit a packet not owned by us, stop */
                if (td->tmd1_bits & LE_T1_OWN)
                        break;

                if (td->tmd1_bits & LE_T1_ERR) {
                        status = td->misc;

                        dev->stats.tx_errors++;
                        if (status & LE_T3_RTY)
                                dev->stats.tx_aborted_errors++;
                        if (status & LE_T3_LCOL)
                                dev->stats.tx_window_errors++;

                        if (status & LE_T3_CLOS) {
                                dev->stats.tx_carrier_errors++;
                                if (lp->auto_select) {
                                        lp->tpe = 1 - lp->tpe;
                                        netdev_err(dev, "Carrier Lost, trying %s\n",
                                                   lp->tpe ? "TPE" : "AUI");
                                        /* Stop the lance */
                                        ll->rap = LE_CSR0;
                                        ll->rdp = LE_C0_STOP;
                                        lance_init_ring(dev);
                                        load_csrs(lp);
                                        init_restart_lance(lp);
                                        return 0;
                                }
                        }

                        /* buffer errors and underflows turn off
                         * the transmitter, so restart the adapter
                         */
                        if (status & (LE_T3_BUF | LE_T3_UFL)) {
                                dev->stats.tx_fifo_errors++;

                                netdev_err(dev, "Tx: ERR_BUF|ERR_UFL, restarting\n");
                                /* Stop the lance */
                                ll->rap = LE_CSR0;
                                ll->rdp = LE_C0_STOP;
                                lance_init_ring(dev);
                                load_csrs(lp);
                                init_restart_lance(lp);
                                return 0;
                        }
                } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
                        /* So we don't count the packet more than once. */
                        td->tmd1_bits &= ~(LE_T1_POK);

                        /* One collision before packet was sent. */
                        if (td->tmd1_bits & LE_T1_EONE)
                                dev->stats.collisions++;

                        /* More than one collision, be optimistic. */
                        if (td->tmd1_bits & LE_T1_EMORE)
                                dev->stats.collisions += 2;

                        dev->stats.tx_packets++;
                }

                j = (j + 1) & lp->tx_ring_mod_mask;
        }
        lp->tx_old = j;
        ll->rdp = LE_C0_TINT | LE_C0_INEA;
        return 0;
}

static int lance_tx_buffs_avail(struct lance_private *lp)
{
        if (lp->tx_old <= lp->tx_new)
                return lp->tx_old + lp->tx_ring_mod_mask - lp->tx_new;
        return lp->tx_old - lp->tx_new - 1;
}

static irqreturn_t lance_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;
        int csr0;

        ll->rap = LE_CSR0;              /* LANCE Controller Status */
        csr0 = ll->rdp;

        if (!(csr0 & LE_C0_INTR))       /* Check if any interrupt has */
                return IRQ_NONE;        /* been generated by the Lance. */

        /* Acknowledge all the interrupt sources ASAP */
        ll->rdp = csr0 & ~(LE_C0_INEA | LE_C0_TDMD | LE_C0_STOP | LE_C0_STRT |
                           LE_C0_INIT);

        if (csr0 & LE_C0_ERR) {
                /* Clear the error condition */
                ll->rdp = LE_C0_BABL | LE_C0_ERR | LE_C0_MISS | LE_C0_INEA;
        }

        if (csr0 & LE_C0_RINT)
                lance_rx(dev);

        if (csr0 & LE_C0_TINT)
                lance_tx(dev);

        /* Log misc errors. */
        if (csr0 & LE_C0_BABL)
                dev->stats.tx_errors++;       /* Tx babble. */
        if (csr0 & LE_C0_MISS)
                dev->stats.rx_errors++;       /* Missed a Rx frame. */
        if (csr0 & LE_C0_MERR) {
                netdev_err(dev, "Bus master arbitration failure, status %04x\n",
                           csr0);
                /* Restart the chip. */
                ll->rdp = LE_C0_STRT;
        }

        if (netif_queue_stopped(dev) && lance_tx_buffs_avail(lp) > 0)
                netif_wake_queue(dev);

        ll->rap = LE_CSR0;
        ll->rdp = (LE_C0_BABL | LE_C0_CERR | LE_C0_MISS | LE_C0_MERR |
                   LE_C0_IDON | LE_C0_INEA);
        return IRQ_HANDLED;
}

static int lance_open(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;
        int ret;

        /* Stop the Lance */
        ll->rap = LE_CSR0;
        ll->rdp = LE_C0_STOP;

        /* Install the Interrupt handler */
        ret = request_irq(IRQ_AMIGA_PORTS, lance_interrupt, IRQF_SHARED,
                          dev->name, dev);
        if (ret)
                return ret;

        load_csrs(lp);
        lance_init_ring(dev);

        netif_start_queue(dev);

        return init_restart_lance(lp);
}

static int lance_close(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;

        netif_stop_queue(dev);
        del_timer_sync(&lp->multicast_timer);

        /* Stop the card */
        ll->rap = LE_CSR0;
        ll->rdp = LE_C0_STOP;

        free_irq(IRQ_AMIGA_PORTS, dev);
        return 0;
}

static inline int lance_reset(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;
        int status;

        /* Stop the lance */
        ll->rap = LE_CSR0;
        ll->rdp = LE_C0_STOP;

        load_csrs(lp);

        lance_init_ring(dev);
        netif_trans_update(dev); /* prevent tx timeout */
        netif_start_queue(dev);

        status = init_restart_lance(lp);
        netdev_dbg(dev, "Lance restart=%d\n", status);

        return status;
}

static void lance_tx_timeout(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;

        netdev_err(dev, "transmit timed out, status %04x, reset\n", ll->rdp);
        lance_reset(dev);
        netif_wake_queue(dev);
}

static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
                                    struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_regs *ll = lp->ll;
        volatile struct lance_init_block *ib = lp->init_block;
        int entry, skblen;
        int status = NETDEV_TX_OK;
        unsigned long flags;

        if (skb_padto(skb, ETH_ZLEN))
                return NETDEV_TX_OK;
        skblen = max_t(unsigned, skb->len, ETH_ZLEN);

        local_irq_save(flags);

        if (!lance_tx_buffs_avail(lp))
                goto out_free;

#ifdef DEBUG
        /* dump the packet */
        print_hex_dump(KERN_DEBUG, "skb->data: ", DUMP_PREFIX_NONE,
                       16, 1, skb->data, 64, true);
#endif
        entry = lp->tx_new & lp->tx_ring_mod_mask;
        ib->btx_ring[entry].length = (-skblen) | 0xf000;
        ib->btx_ring[entry].misc = 0;

        skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);

        /* Now, give the packet to the lance */
        ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
        lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
        dev->stats.tx_bytes += skblen;

        if (lance_tx_buffs_avail(lp) <= 0)
                netif_stop_queue(dev);

        /* Kick the lance: transmit now */
        ll->rdp = LE_C0_INEA | LE_C0_TDMD;
 out_free:
        dev_kfree_skb(skb);

        local_irq_restore(flags);

        return status;
}

/* taken from the depca driver */
static void lance_load_multicast(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_init_block *ib = lp->init_block;
        volatile u16 *mcast_table = (u16 *)&ib->filter;
        struct netdev_hw_addr *ha;
        u32 crc;

        /* set all multicast bits */
        if (dev->flags & IFF_ALLMULTI) {
                ib->filter[0] = 0xffffffff;
                ib->filter[1] = 0xffffffff;
                return;
        }
        /* clear the multicast filter */
        ib->filter[0] = 0;
        ib->filter[1] = 0;

        /* Add addresses */
        netdev_for_each_mc_addr(ha, dev) {
                crc = ether_crc_le(6, ha->addr);
                crc = crc >> 26;
                mcast_table[crc >> 4] |= 1 << (crc & 0xf);
        }
}

static void lance_set_multicast(struct net_device *dev)
{
        struct lance_private *lp = netdev_priv(dev);
        volatile struct lance_init_block *ib = lp->init_block;
        volatile struct lance_regs *ll = lp->ll;

        if (!netif_running(dev))
                return;

        if (lp->tx_old != lp->tx_new) {
                mod_timer(&lp->multicast_timer, jiffies + 4);
                netif_wake_queue(dev);
                return;
        }

        netif_stop_queue(dev);

        ll->rap = LE_CSR0;
        ll->rdp = LE_C0_STOP;
        lance_init_ring(dev);

        if (dev->flags & IFF_PROMISC) {
                ib->mode |= LE_MO_PROM;
        } else {
                ib->mode &= ~LE_MO_PROM;
                lance_load_multicast(dev);
        }
        load_csrs(lp);
        init_restart_lance(lp);
        netif_wake_queue(dev);
}

static int a2065_init_one(struct zorro_dev *z,
                          const struct zorro_device_id *ent);
static void a2065_remove_one(struct zorro_dev *z);


static struct zorro_device_id a2065_zorro_tbl[] = {
        { ZORRO_PROD_CBM_A2065_1 },
        { ZORRO_PROD_CBM_A2065_2 },
        { ZORRO_PROD_AMERISTAR_A2065 },
        { 0 }
};
MODULE_DEVICE_TABLE(zorro, a2065_zorro_tbl);

static struct zorro_driver a2065_driver = {
        .name           = "a2065",
        .id_table       = a2065_zorro_tbl,
        .probe          = a2065_init_one,
        .remove         = a2065_remove_one,
};

static const struct net_device_ops lance_netdev_ops = {
        .ndo_open               = lance_open,
        .ndo_stop               = lance_close,
        .ndo_start_xmit         = lance_start_xmit,
        .ndo_tx_timeout         = lance_tx_timeout,
        .ndo_set_rx_mode        = lance_set_multicast,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_change_mtu         = eth_change_mtu,
        .ndo_set_mac_address    = eth_mac_addr,
};

static int a2065_init_one(struct zorro_dev *z,
                          const struct zorro_device_id *ent)
{
        struct net_device *dev;
        struct lance_private *priv;
        unsigned long board = z->resource.start;
        unsigned long base_addr = board + A2065_LANCE;
        unsigned long mem_start = board + A2065_RAM;
        struct resource *r1, *r2;
        u32 serial;
        int err;

        r1 = request_mem_region(base_addr, sizeof(struct lance_regs),
                                "Am7990");
        if (!r1)
                return -EBUSY;
        r2 = request_mem_region(mem_start, A2065_RAM_SIZE, "RAM");
        if (!r2) {
                release_mem_region(base_addr, sizeof(struct lance_regs));
                return -EBUSY;
        }

        dev = alloc_etherdev(sizeof(struct lance_private));
        if (dev == NULL) {
                release_mem_region(base_addr, sizeof(struct lance_regs));
                release_mem_region(mem_start, A2065_RAM_SIZE);
                return -ENOMEM;
        }

        priv = netdev_priv(dev);

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

        serial = be32_to_cpu(z->rom.er_SerialNumber);
        dev->dev_addr[0] = 0x00;
        if (z->id != ZORRO_PROD_AMERISTAR_A2065) {      /* Commodore */
                dev->dev_addr[1] = 0x80;
                dev->dev_addr[2] = 0x10;
        } else {                                        /* Ameristar */
                dev->dev_addr[1] = 0x00;
                dev->dev_addr[2] = 0x9f;
        }
        dev->dev_addr[3] = (serial >> 16) & 0xff;
        dev->dev_addr[4] = (serial >> 8) & 0xff;
        dev->dev_addr[5] = serial & 0xff;
        dev->base_addr = (unsigned long)ZTWO_VADDR(base_addr);
        dev->mem_start = (unsigned long)ZTWO_VADDR(mem_start);
        dev->mem_end = dev->mem_start + A2065_RAM_SIZE;

        priv->ll = (volatile struct lance_regs *)dev->base_addr;
        priv->init_block = (struct lance_init_block *)dev->mem_start;
        priv->lance_init_block = (struct lance_init_block *)A2065_RAM;
        priv->auto_select = 0;
        priv->busmaster_regval = LE_C3_BSWP;

        priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
        priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
        priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
        priv->tx_ring_mod_mask = TX_RING_MOD_MASK;

        dev->netdev_ops = &lance_netdev_ops;
        dev->watchdog_timeo = 5*HZ;
        dev->dma = 0;

        init_timer(&priv->multicast_timer);
        priv->multicast_timer.data = (unsigned long) dev;
        priv->multicast_timer.function =
                (void (*)(unsigned long))lance_set_multicast;

        err = register_netdev(dev);
        if (err) {
                release_mem_region(base_addr, sizeof(struct lance_regs));
                release_mem_region(mem_start, A2065_RAM_SIZE);
                free_netdev(dev);
                return err;
        }
        zorro_set_drvdata(z, dev);

        netdev_info(dev, "A2065 at 0x%08lx, Ethernet Address %pM\n",
                    board, dev->dev_addr);

        return 0;
}


static void a2065_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 lance_regs));
        release_mem_region(ZTWO_PADDR(dev->mem_start), A2065_RAM_SIZE);
        free_netdev(dev);
}

static int __init a2065_init_module(void)
{
        return zorro_register_driver(&a2065_driver);
}

static void __exit a2065_cleanup_module(void)
{
        zorro_unregister_driver(&a2065_driver);
}

module_init(a2065_init_module);
module_exit(a2065_cleanup_module);

MODULE_LICENSE("GPL");