drivers/net/ethernet/8390/zorro8390.c - kernel/bruno - Git at Google

 /*
  *  Amiga Linux/m68k and Linux/PPC Zorro NS8390 Ethernet Driver
  *
  *  (C) Copyright 1998-2000 by some Elitist 680x0 Users(TM)
  *
  *  ---------------------------------------------------------------------------
  *
  *  This program is based on all the other NE2000 drivers for Linux
  *
  *  ---------------------------------------------------------------------------
  *
  *  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 II and X-Surf are Zorro-II boards containing Realtek RTL8019AS
  *  Ethernet Controllers.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/zorro.h>
 #include <linux/jiffies.h>

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

 #define EI_SHIFT(x)		(ei_local->reg_offset[x])
 #define ei_inb(port)		in_8(port)
 #define ei_outb(val, port)	out_8(port, val)
 #define ei_inb_p(port)		in_8(port)
 #define ei_outb_p(val, port)	out_8(port, val)

 static const char version[] =
 	"8390.c:v1.10cvs 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

 static u32 zorro8390_msg_enable;

 #include "lib8390.c"

 #define DRV_NAME	"zorro8390"

 #define NE_BASE		(dev->base_addr)
 #define NE_CMD		(0x00 * 2)
 #define NE_DATAPORT	(0x10 * 2)	/* NatSemi-defined port window offset */
 #define NE_RESET	(0x1f * 2)	/* Issue a read to reset,
 					 * a write to clear. */
 #define NE_IO_EXTENT	(0x20 * 2)

 #define NE_EN0_ISR	(0x07 * 2)
 #define NE_EN0_DCFG	(0x0e * 2)

 #define NE_EN0_RSARLO	(0x08 * 2)
 #define NE_EN0_RSARHI	(0x09 * 2)
 #define NE_EN0_RCNTLO	(0x0a * 2)
 #define NE_EN0_RXCR	(0x0c * 2)
 #define NE_EN0_TXCR	(0x0d * 2)
 #define NE_EN0_RCNTHI	(0x0b * 2)
 #define NE_EN0_IMR	(0x0f * 2)

 #define NESM_START_PG	0x40	/* First page of TX buffer */
 #define NESM_STOP_PG	0x80	/* Last page +1 of RX ring */

 #define WORDSWAP(a)	((((a) >> 8) & 0xff) | ((a) << 8))

 static struct card_info {
 	zorro_id id;
 	const char *name;
 	unsigned int offset;
 } cards[] = {
 	{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE2, "Ariadne II", 0x0600 },
 	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, "X-Surf", 0x8600 },
 };

 /* Hard reset the card.  This used to pause for the same period that a
  * 8390 reset command required, but that shouldn't be necessary.
  */
 static void zorro8390_reset_8390(struct net_device *dev)
 {
 	unsigned long reset_start_time = jiffies;
 	struct ei_device *ei_local = netdev_priv(dev);

 	netif_dbg(ei_local, hw, dev, "resetting - t=%ld...\n", jiffies);

 	z_writeb(z_readb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);

 	ei_status.txing = 0;
 	ei_status.dmaing = 0;

 	/* This check _should_not_ be necessary, omit eventually. */
 	while ((z_readb(NE_BASE + NE_EN0_ISR) & ENISR_RESET) == 0)
 		if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) {
 			netdev_warn(dev, "%s: did not complete\n", __func__);
 			break;
 		}
 	z_writeb(ENISR_RESET, NE_BASE + NE_EN0_ISR);	/* Ack intr */
 }

 /* Grab the 8390 specific header. Similar to the block_input routine, but
  * we don't need to be concerned with ring wrap as the header will be at
  * the start of a page, so we optimize accordingly.
  */
 static void zorro8390_get_8390_hdr(struct net_device *dev,
 				   struct e8390_pkt_hdr *hdr, int ring_page)
 {
 	int nic_base = dev->base_addr;
 	int cnt;
 	short *ptrs;

 	/* This *shouldn't* happen.
 	 * If it does, it's the last thing you'll see
 	 */
 	if (ei_status.dmaing) {
 		netdev_warn(dev,
 			    "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
 			    __func__, ei_status.dmaing, ei_status.irqlock);
 		return;
 	}

 	ei_status.dmaing |= 0x01;
 	z_writeb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);
 	z_writeb(sizeof(struct e8390_pkt_hdr), nic_base + NE_EN0_RCNTLO);
 	z_writeb(0, nic_base + NE_EN0_RCNTHI);
 	z_writeb(0, nic_base + NE_EN0_RSARLO);		/* On page boundary */
 	z_writeb(ring_page, nic_base + NE_EN0_RSARHI);
 	z_writeb(E8390_RREAD+E8390_START, nic_base + NE_CMD);

 	ptrs = (short *)hdr;
 	for (cnt = 0; cnt < sizeof(struct e8390_pkt_hdr) >> 1; cnt++)
 		*ptrs++ = z_readw(NE_BASE + NE_DATAPORT);

 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);	/* Ack intr */

 	hdr->count = WORDSWAP(hdr->count);

 	ei_status.dmaing &= ~0x01;
 }

 /* Block input and output, similar to the Crynwr packet driver.
  * If you are porting to a new ethercard, look at the packet driver source
  * for hints. The NEx000 doesn't share the on-board packet memory --
  * you have to put the packet out through the "remote DMA" dataport
  * using z_writeb.
  */
 static void zorro8390_block_input(struct net_device *dev, int count,
 				  struct sk_buff *skb, int ring_offset)
 {
 	int nic_base = dev->base_addr;
 	char *buf = skb->data;
 	short *ptrs;
 	int cnt;

 	/* This *shouldn't* happen.
 	 * If it does, it's the last thing you'll see
 	 */
 	if (ei_status.dmaing) {
 		netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
 			   __func__, ei_status.dmaing, ei_status.irqlock);
 		return;
 	}
 	ei_status.dmaing |= 0x01;
 	z_writeb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);
 	z_writeb(count & 0xff, nic_base + NE_EN0_RCNTLO);
 	z_writeb(count >> 8, nic_base + NE_EN0_RCNTHI);
 	z_writeb(ring_offset & 0xff, nic_base + NE_EN0_RSARLO);
 	z_writeb(ring_offset >> 8, nic_base + NE_EN0_RSARHI);
 	z_writeb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 	ptrs = (short *)buf;
 	for (cnt = 0; cnt < count >> 1; cnt++)
 		*ptrs++ = z_readw(NE_BASE + NE_DATAPORT);
 	if (count & 0x01)
 		buf[count - 1] = z_readb(NE_BASE + NE_DATAPORT);

 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);	/* Ack intr */
 	ei_status.dmaing &= ~0x01;
 }

 static void zorro8390_block_output(struct net_device *dev, int count,
 				   const unsigned char *buf,
 				   const int start_page)
 {
 	int nic_base = NE_BASE;
 	unsigned long dma_start;
 	short *ptrs;
 	int cnt;

 	/* Round the count up for word writes.  Do we need to do this?
 	 * What effect will an odd byte count have on the 8390?
 	 * I should check someday.
 	 */
 	if (count & 0x01)
 		count++;

 	/* This *shouldn't* happen.
 	 * If it does, it's the last thing you'll see
 	 */
 	if (ei_status.dmaing) {
 		netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
 			   __func__, ei_status.dmaing, ei_status.irqlock);
 		return;
 	}
 	ei_status.dmaing |= 0x01;
 	/* We should already be in page 0, but to be safe... */
 	z_writeb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);

 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);

 	/* Now the normal output. */
 	z_writeb(count & 0xff, nic_base + NE_EN0_RCNTLO);
 	z_writeb(count >> 8,   nic_base + NE_EN0_RCNTHI);
 	z_writeb(0x00, nic_base + NE_EN0_RSARLO);
 	z_writeb(start_page, nic_base + NE_EN0_RSARHI);

 	z_writeb(E8390_RWRITE + E8390_START, nic_base + NE_CMD);
 	ptrs = (short *)buf;
 	for (cnt = 0; cnt < count >> 1; cnt++)
 		z_writew(*ptrs++, NE_BASE + NE_DATAPORT);

 	dma_start = jiffies;

 	while ((z_readb(NE_BASE + NE_EN0_ISR) & ENISR_RDC) == 0)
 		if (time_after(jiffies, dma_start + 2 * HZ / 100)) {
 					/* 20ms */
 			netdev_warn(dev, "timeout waiting for Tx RDC\n");
 			zorro8390_reset_8390(dev);
 			__NS8390_init(dev, 1);
 			break;
 		}

 	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);	/* Ack intr */
 	ei_status.dmaing &= ~0x01;
 }

 static int zorro8390_open(struct net_device *dev)
 {
 	__ei_open(dev);
 	return 0;
 }

 static int zorro8390_close(struct net_device *dev)
 {
 	struct ei_device *ei_local = netdev_priv(dev);

 	netif_dbg(ei_local, ifdown, dev, "Shutting down ethercard\n");
 	__ei_close(dev);
 	return 0;
 }

 static void zorro8390_remove_one(struct zorro_dev *z)
 {
 	struct net_device *dev = zorro_get_drvdata(z);

 	unregister_netdev(dev);
 	free_irq(IRQ_AMIGA_PORTS, dev);
 	release_mem_region(ZTWO_PADDR(dev->base_addr), NE_IO_EXTENT * 2);
 	free_netdev(dev);
 }

 static struct zorro_device_id zorro8390_zorro_tbl[] = {
 	{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE2, },
 	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, },
 	{ 0 }
 };
 MODULE_DEVICE_TABLE(zorro, zorro8390_zorro_tbl);

 static const struct net_device_ops zorro8390_netdev_ops = {
 	.ndo_open		= zorro8390_open,
 	.ndo_stop		= zorro8390_close,
 	.ndo_start_xmit		= __ei_start_xmit,
 	.ndo_tx_timeout		= __ei_tx_timeout,
 	.ndo_get_stats		= __ei_get_stats,
 	.ndo_set_rx_mode	= __ei_set_multicast_list,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= eth_mac_addr,
 	.ndo_change_mtu		= eth_change_mtu,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= __ei_poll,
 #endif
 };

 static int zorro8390_init(struct net_device *dev, unsigned long board,
 			  const char *name, void __iomem *ioaddr)
 {
 	int i;
 	int err;
 	unsigned char SA_prom[32];
 	int start_page, stop_page;
 	struct ei_device *ei_local = netdev_priv(dev);
 	static u32 zorro8390_offsets[16] = {
 		0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e,
 		0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
 	};

 	/* Reset card. Who knows what dain-bramaged state it was left in. */
 	{
 		unsigned long reset_start_time = jiffies;

 		z_writeb(z_readb(ioaddr + NE_RESET), ioaddr + NE_RESET);

 		while ((z_readb(ioaddr + NE_EN0_ISR) & ENISR_RESET) == 0)
 			if (time_after(jiffies,
 				       reset_start_time + 2 * HZ / 100)) {
 				netdev_warn(dev, "not found (no reset ack)\n");
 				return -ENODEV;
 			}

 		z_writeb(0xff, ioaddr + NE_EN0_ISR);	/* Ack all intr. */
 	}

 	/* Read the 16 bytes of station address PROM.
 	 * We must first initialize registers,
 	 * similar to NS8390_init(eifdev, 0).
 	 * We can't reliably read the SAPROM address without this.
 	 * (I learned the hard way!).
 	 */
 	{
 		static const struct {
 			u32 value;
 			u32 offset;
 		} program_seq[] = {
 			{E8390_NODMA + E8390_PAGE0 + E8390_STOP, NE_CMD},
 						/* Select page 0 */
 			{0x48,	NE_EN0_DCFG},	/* 0x48: Set byte-wide access */
 			{0x00,	NE_EN0_RCNTLO},	/* Clear the count regs */
 			{0x00,	NE_EN0_RCNTHI},
 			{0x00,	NE_EN0_IMR},	/* Mask completion irq */
 			{0xFF,	NE_EN0_ISR},
 			{E8390_RXOFF, NE_EN0_RXCR}, /* 0x20 Set to monitor */
 			{E8390_TXOFF, NE_EN0_TXCR}, /* 0x02 and loopback mode */
 			{32,	NE_EN0_RCNTLO},
 			{0x00,	NE_EN0_RCNTHI},
 			{0x00,	NE_EN0_RSARLO},	/* DMA starting at 0x0000 */
 			{0x00,	NE_EN0_RSARHI},
 			{E8390_RREAD + E8390_START, NE_CMD},
 		};
 		for (i = 0; i < ARRAY_SIZE(program_seq); i++)
 			z_writeb(program_seq[i].value,
 				 ioaddr + program_seq[i].offset);
 	}
 	for (i = 0; i < 16; i++) {
 		SA_prom[i] = z_readb(ioaddr + NE_DATAPORT);
 		(void)z_readb(ioaddr + NE_DATAPORT);
 	}

 	/* We must set the 8390 for word mode. */
 	z_writeb(0x49, ioaddr + NE_EN0_DCFG);
 	start_page = NESM_START_PG;
 	stop_page = NESM_STOP_PG;

 	dev->base_addr = (unsigned long)ioaddr;
 	dev->irq = IRQ_AMIGA_PORTS;

 	/* Install the Interrupt handler */
 	i = request_irq(IRQ_AMIGA_PORTS, __ei_interrupt,
 			IRQF_SHARED, DRV_NAME, dev);
 	if (i)
 		return i;

 	for (i = 0; i < ETH_ALEN; i++)
 		dev->dev_addr[i] = SA_prom[i];

 	pr_debug("Found ethernet address: %pM\n", dev->dev_addr);

 	ei_status.name = name;
 	ei_status.tx_start_page = start_page;
 	ei_status.stop_page = stop_page;
 	ei_status.word16 = 1;

 	ei_status.rx_start_page = start_page + TX_PAGES;

 	ei_status.reset_8390 = zorro8390_reset_8390;
 	ei_status.block_input = zorro8390_block_input;
 	ei_status.block_output = zorro8390_block_output;
 	ei_status.get_8390_hdr = zorro8390_get_8390_hdr;
 	ei_status.reg_offset = zorro8390_offsets;

 	dev->netdev_ops = &zorro8390_netdev_ops;
 	__NS8390_init(dev, 0);

 	ei_local->msg_enable = zorro8390_msg_enable;

 	err = register_netdev(dev);
 	if (err) {
 		free_irq(IRQ_AMIGA_PORTS, dev);
 		return err;
 	}

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

 	return 0;
 }

 static int zorro8390_init_one(struct zorro_dev *z,
 			      const struct zorro_device_id *ent)
 {
 	struct net_device *dev;
 	unsigned long board, ioaddr;
 	int err, i;

 	for (i = ARRAY_SIZE(cards) - 1; i >= 0; i--)
 		if (z->id == cards[i].id)
 			break;
 	if (i < 0)
 		return -ENODEV;

 	board = z->resource.start;
 	ioaddr = board + cards[i].offset;
 	dev = ____alloc_ei_netdev(0);
 	if (!dev)
 		return -ENOMEM;
 	if (!request_mem_region(ioaddr, NE_IO_EXTENT * 2, DRV_NAME)) {
 		free_netdev(dev);
 		return -EBUSY;
 	}
 	err = zorro8390_init(dev, board, cards[i].name, ZTWO_VADDR(ioaddr));
 	if (err) {
 		release_mem_region(ioaddr, NE_IO_EXTENT * 2);
 		free_netdev(dev);
 		return err;
 	}
 	zorro_set_drvdata(z, dev);
 	return 0;
 }

 static struct zorro_driver zorro8390_driver = {
 	.name		= "zorro8390",
 	.id_table	= zorro8390_zorro_tbl,
 	.probe		= zorro8390_init_one,
 	.remove		= zorro8390_remove_one,
 };

 static int __init zorro8390_init_module(void)
 {
 	return zorro_register_driver(&zorro8390_driver);
 }

 static void __exit zorro8390_cleanup_module(void)
 {
 	zorro_unregister_driver(&zorro8390_driver);
 }

 module_init(zorro8390_init_module);
 module_exit(zorro8390_cleanup_module);

 MODULE_LICENSE("GPL");
	/*
	* Amiga Linux/m68k and Linux/PPC Zorro NS8390 Ethernet Driver
	*
	* (C) Copyright 1998-2000 by some Elitist 680x0 Users(TM)
	*
	* ---------------------------------------------------------------------------
	*
	* This program is based on all the other NE2000 drivers for Linux
	*
	* ---------------------------------------------------------------------------
	*
	* 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 II and X-Surf are Zorro-II boards containing Realtek RTL8019AS
	* Ethernet Controllers.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/zorro.h>
	#include <linux/jiffies.h>

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

	#define EI_SHIFT(x) (ei_local->reg_offset[x])
	#define ei_inb(port) in_8(port)
	#define ei_outb(val, port) out_8(port, val)
	#define ei_inb_p(port) in_8(port)
	#define ei_outb_p(val, port) out_8(port, val)

	static const char version[] =
	"8390.c:v1.10cvs 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

	static u32 zorro8390_msg_enable;

	#include "lib8390.c"

	#define DRV_NAME "zorro8390"

	#define NE_BASE (dev->base_addr)
	#define NE_CMD (0x00 * 2)
	#define NE_DATAPORT (0x10 * 2) /* NatSemi-defined port window offset */
	#define NE_RESET (0x1f * 2) /* Issue a read to reset,
	* a write to clear. */
	#define NE_IO_EXTENT (0x20 * 2)

	#define NE_EN0_ISR (0x07 * 2)
	#define NE_EN0_DCFG (0x0e * 2)

	#define NE_EN0_RSARLO (0x08 * 2)
	#define NE_EN0_RSARHI (0x09 * 2)
	#define NE_EN0_RCNTLO (0x0a * 2)
	#define NE_EN0_RXCR (0x0c * 2)
	#define NE_EN0_TXCR (0x0d * 2)
	#define NE_EN0_RCNTHI (0x0b * 2)
	#define NE_EN0_IMR (0x0f * 2)

	#define NESM_START_PG 0x40 /* First page of TX buffer */
	#define NESM_STOP_PG 0x80 /* Last page +1 of RX ring */

	#define WORDSWAP(a) ((((a) >> 8) & 0xff) \| ((a) << 8))

	static struct card_info {
	zorro_id id;
	const char *name;
	unsigned int offset;
	} cards[] = {
	{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE2, "Ariadne II", 0x0600 },
	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, "X-Surf", 0x8600 },
	};

	/* Hard reset the card. This used to pause for the same period that a
	* 8390 reset command required, but that shouldn't be necessary.
	*/
	static void zorro8390_reset_8390(struct net_device *dev)
	{
	unsigned long reset_start_time = jiffies;
	struct ei_device *ei_local = netdev_priv(dev);

	netif_dbg(ei_local, hw, dev, "resetting - t=%ld...\n", jiffies);

	z_writeb(z_readb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);

	ei_status.txing = 0;
	ei_status.dmaing = 0;

	/* This check _should_not_ be necessary, omit eventually. */
	while ((z_readb(NE_BASE + NE_EN0_ISR) & ENISR_RESET) == 0)
	if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) {
	netdev_warn(dev, "%s: did not complete\n", __func__);
	break;
	}
	z_writeb(ENISR_RESET, NE_BASE + NE_EN0_ISR); /* Ack intr */
	}

	/* Grab the 8390 specific header. Similar to the block_input routine, but
	* we don't need to be concerned with ring wrap as the header will be at
	* the start of a page, so we optimize accordingly.
	*/
	static void zorro8390_get_8390_hdr(struct net_device *dev,
	struct e8390_pkt_hdr *hdr, int ring_page)
	{
	int nic_base = dev->base_addr;
	int cnt;
	short *ptrs;

	/* This shouldn't happen.
	* If it does, it's the last thing you'll see
	*/
	if (ei_status.dmaing) {
	netdev_warn(dev,
	"%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
	__func__, ei_status.dmaing, ei_status.irqlock);
	return;
	}

	ei_status.dmaing \|= 0x01;
	z_writeb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);
	z_writeb(sizeof(struct e8390_pkt_hdr), nic_base + NE_EN0_RCNTLO);
	z_writeb(0, nic_base + NE_EN0_RCNTHI);
	z_writeb(0, nic_base + NE_EN0_RSARLO); /* On page boundary */
	z_writeb(ring_page, nic_base + NE_EN0_RSARHI);
	z_writeb(E8390_RREAD+E8390_START, nic_base + NE_CMD);

	ptrs = (short *)hdr;
	for (cnt = 0; cnt < sizeof(struct e8390_pkt_hdr) >> 1; cnt++)
	*ptrs++ = z_readw(NE_BASE + NE_DATAPORT);

	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR); /* Ack intr */

	hdr->count = WORDSWAP(hdr->count);

	ei_status.dmaing &= ~0x01;
	}

	/* Block input and output, similar to the Crynwr packet driver.
	* If you are porting to a new ethercard, look at the packet driver source
	* for hints. The NEx000 doesn't share the on-board packet memory --
	* you have to put the packet out through the "remote DMA" dataport
	* using z_writeb.
	*/
	static void zorro8390_block_input(struct net_device *dev, int count,
	struct sk_buff *skb, int ring_offset)
	{
	int nic_base = dev->base_addr;
	char *buf = skb->data;
	short *ptrs;
	int cnt;

	/* This shouldn't happen.
	* If it does, it's the last thing you'll see
	*/
	if (ei_status.dmaing) {
	netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
	__func__, ei_status.dmaing, ei_status.irqlock);
	return;
	}
	ei_status.dmaing \|= 0x01;
	z_writeb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);
	z_writeb(count & 0xff, nic_base + NE_EN0_RCNTLO);
	z_writeb(count >> 8, nic_base + NE_EN0_RCNTHI);
	z_writeb(ring_offset & 0xff, nic_base + NE_EN0_RSARLO);
	z_writeb(ring_offset >> 8, nic_base + NE_EN0_RSARHI);
	z_writeb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
	ptrs = (short *)buf;
	for (cnt = 0; cnt < count >> 1; cnt++)
	*ptrs++ = z_readw(NE_BASE + NE_DATAPORT);
	if (count & 0x01)
	buf[count - 1] = z_readb(NE_BASE + NE_DATAPORT);

	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR); /* Ack intr */
	ei_status.dmaing &= ~0x01;
	}

	static void zorro8390_block_output(struct net_device *dev, int count,
	const unsigned char *buf,
	const int start_page)
	{
	int nic_base = NE_BASE;
	unsigned long dma_start;
	short *ptrs;
	int cnt;

	/* Round the count up for word writes. Do we need to do this?
	* What effect will an odd byte count have on the 8390?
	* I should check someday.
	*/
	if (count & 0x01)
	count++;

	/* This shouldn't happen.
	* If it does, it's the last thing you'll see
	*/
	if (ei_status.dmaing) {
	netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
	__func__, ei_status.dmaing, ei_status.irqlock);
	return;
	}
	ei_status.dmaing \|= 0x01;
	/* We should already be in page 0, but to be safe... */
	z_writeb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);

	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR);

	/* Now the normal output. */
	z_writeb(count & 0xff, nic_base + NE_EN0_RCNTLO);
	z_writeb(count >> 8, nic_base + NE_EN0_RCNTHI);
	z_writeb(0x00, nic_base + NE_EN0_RSARLO);
	z_writeb(start_page, nic_base + NE_EN0_RSARHI);

	z_writeb(E8390_RWRITE + E8390_START, nic_base + NE_CMD);
	ptrs = (short *)buf;
	for (cnt = 0; cnt < count >> 1; cnt++)
	z_writew(*ptrs++, NE_BASE + NE_DATAPORT);

	dma_start = jiffies;

	while ((z_readb(NE_BASE + NE_EN0_ISR) & ENISR_RDC) == 0)
	if (time_after(jiffies, dma_start + 2 * HZ / 100)) {
	/* 20ms */
	netdev_warn(dev, "timeout waiting for Tx RDC\n");
	zorro8390_reset_8390(dev);
	__NS8390_init(dev, 1);
	break;
	}

	z_writeb(ENISR_RDC, nic_base + NE_EN0_ISR); /* Ack intr */
	ei_status.dmaing &= ~0x01;
	}

	static int zorro8390_open(struct net_device *dev)
	{
	__ei_open(dev);
	return 0;
	}

	static int zorro8390_close(struct net_device *dev)
	{
	struct ei_device *ei_local = netdev_priv(dev);

	netif_dbg(ei_local, ifdown, dev, "Shutting down ethercard\n");
	__ei_close(dev);
	return 0;
	}

	static void zorro8390_remove_one(struct zorro_dev *z)
	{
	struct net_device *dev = zorro_get_drvdata(z);

	unregister_netdev(dev);
	free_irq(IRQ_AMIGA_PORTS, dev);
	release_mem_region(ZTWO_PADDR(dev->base_addr), NE_IO_EXTENT * 2);
	free_netdev(dev);
	}

	static struct zorro_device_id zorro8390_zorro_tbl[] = {
	{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE2, },
	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, },
	{ 0 }
	};
	MODULE_DEVICE_TABLE(zorro, zorro8390_zorro_tbl);

	static const struct net_device_ops zorro8390_netdev_ops = {
	.ndo_open = zorro8390_open,
	.ndo_stop = zorro8390_close,
	.ndo_start_xmit = __ei_start_xmit,
	.ndo_tx_timeout = __ei_tx_timeout,
	.ndo_get_stats = __ei_get_stats,
	.ndo_set_rx_mode = __ei_set_multicast_list,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_set_mac_address = eth_mac_addr,
	.ndo_change_mtu = eth_change_mtu,
	#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = __ei_poll,
	#endif
	};

	static int zorro8390_init(struct net_device *dev, unsigned long board,
	const char name, void __iomem ioaddr)
	{
	int i;
	int err;
	unsigned char SA_prom[32];
	int start_page, stop_page;
	struct ei_device *ei_local = netdev_priv(dev);
	static u32 zorro8390_offsets[16] = {
	0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e,
	0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
	};

	/* Reset card. Who knows what dain-bramaged state it was left in. */
	{
	unsigned long reset_start_time = jiffies;

	z_writeb(z_readb(ioaddr + NE_RESET), ioaddr + NE_RESET);

	while ((z_readb(ioaddr + NE_EN0_ISR) & ENISR_RESET) == 0)
	if (time_after(jiffies,
	reset_start_time + 2 * HZ / 100)) {
	netdev_warn(dev, "not found (no reset ack)\n");
	return -ENODEV;
	}

	z_writeb(0xff, ioaddr + NE_EN0_ISR); /* Ack all intr. */
	}

	/* Read the 16 bytes of station address PROM.
	* We must first initialize registers,
	* similar to NS8390_init(eifdev, 0).
	* We can't reliably read the SAPROM address without this.
	* (I learned the hard way!).
	*/
	{
	static const struct {
	u32 value;
	u32 offset;
	} program_seq[] = {
	{E8390_NODMA + E8390_PAGE0 + E8390_STOP, NE_CMD},
	/* Select page 0 */
	{0x48, NE_EN0_DCFG}, /* 0x48: Set byte-wide access */
	{0x00, NE_EN0_RCNTLO}, /* Clear the count regs */
	{0x00, NE_EN0_RCNTHI},
	{0x00, NE_EN0_IMR}, /* Mask completion irq */
	{0xFF, NE_EN0_ISR},
	{E8390_RXOFF, NE_EN0_RXCR}, /* 0x20 Set to monitor */
	{E8390_TXOFF, NE_EN0_TXCR}, /* 0x02 and loopback mode */
	{32, NE_EN0_RCNTLO},
	{0x00, NE_EN0_RCNTHI},
	{0x00, NE_EN0_RSARLO}, /* DMA starting at 0x0000 */
	{0x00, NE_EN0_RSARHI},
	{E8390_RREAD + E8390_START, NE_CMD},
	};
	for (i = 0; i < ARRAY_SIZE(program_seq); i++)
	z_writeb(program_seq[i].value,
	ioaddr + program_seq[i].offset);
	}
	for (i = 0; i < 16; i++) {
	SA_prom[i] = z_readb(ioaddr + NE_DATAPORT);
	(void)z_readb(ioaddr + NE_DATAPORT);
	}

	/* We must set the 8390 for word mode. */
	z_writeb(0x49, ioaddr + NE_EN0_DCFG);
	start_page = NESM_START_PG;
	stop_page = NESM_STOP_PG;

	dev->base_addr = (unsigned long)ioaddr;
	dev->irq = IRQ_AMIGA_PORTS;

	/* Install the Interrupt handler */
	i = request_irq(IRQ_AMIGA_PORTS, __ei_interrupt,
	IRQF_SHARED, DRV_NAME, dev);
	if (i)
	return i;

	for (i = 0; i < ETH_ALEN; i++)
	dev->dev_addr[i] = SA_prom[i];

	pr_debug("Found ethernet address: %pM\n", dev->dev_addr);

	ei_status.name = name;
	ei_status.tx_start_page = start_page;
	ei_status.stop_page = stop_page;
	ei_status.word16 = 1;

	ei_status.rx_start_page = start_page + TX_PAGES;

	ei_status.reset_8390 = zorro8390_reset_8390;
	ei_status.block_input = zorro8390_block_input;
	ei_status.block_output = zorro8390_block_output;
	ei_status.get_8390_hdr = zorro8390_get_8390_hdr;
	ei_status.reg_offset = zorro8390_offsets;

	dev->netdev_ops = &zorro8390_netdev_ops;
	__NS8390_init(dev, 0);

	ei_local->msg_enable = zorro8390_msg_enable;

	err = register_netdev(dev);
	if (err) {
	free_irq(IRQ_AMIGA_PORTS, dev);
	return err;
	}

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

	return 0;
	}

	static int zorro8390_init_one(struct zorro_dev *z,
	const struct zorro_device_id *ent)
	{
	struct net_device *dev;
	unsigned long board, ioaddr;
	int err, i;

	for (i = ARRAY_SIZE(cards) - 1; i >= 0; i--)
	if (z->id == cards[i].id)
	break;
	if (i < 0)
	return -ENODEV;

	board = z->resource.start;
	ioaddr = board + cards[i].offset;
	dev = ____alloc_ei_netdev(0);
	if (!dev)
	return -ENOMEM;
	if (!request_mem_region(ioaddr, NE_IO_EXTENT * 2, DRV_NAME)) {
	free_netdev(dev);
	return -EBUSY;
	}
	err = zorro8390_init(dev, board, cards[i].name, ZTWO_VADDR(ioaddr));
	if (err) {
	release_mem_region(ioaddr, NE_IO_EXTENT * 2);
	free_netdev(dev);
	return err;
	}
	zorro_set_drvdata(z, dev);
	return 0;
	}

	static struct zorro_driver zorro8390_driver = {
	.name = "zorro8390",
	.id_table = zorro8390_zorro_tbl,
	.probe = zorro8390_init_one,
	.remove = zorro8390_remove_one,
	};

	static int __init zorro8390_init_module(void)
	{
	return zorro_register_driver(&zorro8390_driver);
	}

	static void __exit zorro8390_cleanup_module(void)
	{
	zorro_unregister_driver(&zorro8390_driver);
	}

	module_init(zorro8390_init_module);
	module_exit(zorro8390_cleanup_module);

	MODULE_LICENSE("GPL");