xref: /linux/drivers/net/ethernet/amd/a2065.c (revision 860e9538a9482bb84589f7d0718a7e6d0a944d58)

/*
 * 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");