drivers/net/arcnet/com90io.c - kernel/quantenna - Git at Google

 /*
  * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
  *
  * Written 1997 by David Woodhouse.
  * Written 1994-1999 by Avery Pennarun.
  * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
  * Derived from skeleton.c by Donald Becker.
  *
  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
  *  for sponsoring the further development of this driver.
  *
  * **********************
  *
  * The original copyright of skeleton.c was as follows:
  *
  * skeleton.c Written 1993 by Donald Becker.
  * Copyright 1993 United States Government as represented by the
  * Director, National Security Agency.  This software may only be used
  * and distributed according to the terms of the GNU General Public License as
  * modified by SRC, incorporated herein by reference.
  *
  * **********************
  *
  * For more details, see drivers/net/arcnet.c
  *
  * **********************
  */

 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/bootmem.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

 #include "arcdevice.h"
 #include "com9026.h"

 /* Internal function declarations */

 static int com90io_found(struct net_device *dev);
 static void com90io_command(struct net_device *dev, int command);
 static int com90io_status(struct net_device *dev);
 static void com90io_setmask(struct net_device *dev, int mask);
 static int com90io_reset(struct net_device *dev, int really_reset);
 static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
 				 void *buf, int count);
 static void com90io_copy_from_card(struct net_device *dev, int bufnum,
 				   int offset, void *buf, int count);

 /* Handy defines for ARCnet specific stuff */

 /* The number of low I/O ports used by the card. */
 #define ARCNET_TOTAL_SIZE 16

 /****************************************************************************
  *                                                                          *
  * IO-mapped operation routines                                             *
  *                                                                          *
  ****************************************************************************/

 #undef ONE_AT_A_TIME_TX
 #undef ONE_AT_A_TIME_RX

 static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
 {
 	int ioaddr = dev->base_addr;

 	arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
 	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

 	return arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
 }

 #ifdef ONE_AT_A_TIME_TX
 static void put_buffer_byte(struct net_device *dev, unsigned offset,
 			    u_char datum)
 {
 	int ioaddr = dev->base_addr;

 	arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
 	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

 	arcnet_outb(datum, ioaddr, COM9026_REG_RW_MEMDATA);
 }

 #endif

 static void get_whole_buffer(struct net_device *dev, unsigned offset,
 			     unsigned length, char *dest)
 {
 	int ioaddr = dev->base_addr;

 	arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

 	while (length--)
 #ifdef ONE_AT_A_TIME_RX
 		*(dest++) = get_buffer_byte(dev, offset++);
 #else
 		*(dest++) = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
 #endif
 }

 static void put_whole_buffer(struct net_device *dev, unsigned offset,
 			     unsigned length, char *dest)
 {
 	int ioaddr = dev->base_addr;

 	arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 	arcnet_outb(offset & 0xff, ioaddr,COM9026_REG_W_ADDR_LO);

 	while (length--)
 #ifdef ONE_AT_A_TIME_TX
 		put_buffer_byte(dev, offset++, *(dest++));
 #else
 		arcnet_outb(*(dest++), ioaddr, COM9026_REG_RW_MEMDATA);
 #endif
 }

 /* We cannot probe for an IO mapped card either, although we can check that
  * it's where we were told it was, and even autoirq
  */
 static int __init com90io_probe(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr, status;
 	unsigned long airqmask;

 	if (BUGLVL(D_NORMAL)) {
 		pr_info("%s\n", "COM90xx IO-mapped mode support (by David Woodhouse et el.)");
 		pr_info("E-mail me if you actually test this driver, please!\n");
 	}

 	if (!ioaddr) {
 		arc_printk(D_NORMAL, dev, "No autoprobe for IO mapped cards; you must specify the base address!\n");
 		return -ENODEV;
 	}
 	if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
 		arc_printk(D_INIT_REASONS, dev, "IO request_region %x-%x failed\n",
 			   ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
 		return -ENXIO;
 	}
 	if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) {
 		arc_printk(D_INIT_REASONS, dev, "IO address %x empty\n",
 			   ioaddr);
 		goto err_out;
 	}
 	arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 	mdelay(RESETtime);

 	status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);

 	if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 		arc_printk(D_INIT_REASONS, dev, "Status invalid (%Xh)\n",
 			   status);
 		goto err_out;
 	}
 	arc_printk(D_INIT_REASONS, dev, "Status after reset: %X\n", status);

 	arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 		    ioaddr, COM9026_REG_W_COMMAND);

 	arc_printk(D_INIT_REASONS, dev, "Status after reset acknowledged: %X\n",
 		   status);

 	status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);

 	if (status & RESETflag) {
 		arc_printk(D_INIT_REASONS, dev, "Eternal reset (status=%Xh)\n",
 			   status);
 		goto err_out;
 	}
 	arcnet_outb((0x16 | IOMAPflag) & ~ENABLE16flag,
 		    ioaddr, COM9026_REG_RW_CONFIG);

 	/* Read first loc'n of memory */

 	arcnet_outb(AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 	arcnet_outb(0, ioaddr,  COM9026_REG_W_ADDR_LO);

 	status = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
 	if (status != 0xd1) {
 		arc_printk(D_INIT_REASONS, dev, "Signature byte not found (%Xh instead).\n",
 			   status);
 		goto err_out;
 	}
 	if (!dev->irq) {
 		/* if we do this, we're sure to get an IRQ since the
 		 * card has just reset and the NORXflag is on until
 		 * we tell it to start receiving.
 		 */

 		airqmask = probe_irq_on();
 		arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK);
 		udelay(1);
 		arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK);
 		dev->irq = probe_irq_off(airqmask);

 		if ((int)dev->irq <= 0) {
 			arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed\n");
 			goto err_out;
 		}
 	}
 	release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
 	return com90io_found(dev);

 err_out:
 	release_region(ioaddr, ARCNET_TOTAL_SIZE);
 	return -ENODEV;
 }

 /* Set up the struct net_device associated with this card.  Called after
  * probing succeeds.
  */
 static int __init com90io_found(struct net_device *dev)
 {
 	struct arcnet_local *lp;
 	int ioaddr = dev->base_addr;
 	int err;

 	/* Reserve the irq */
 	if (request_irq(dev->irq, arcnet_interrupt, 0,
 			"arcnet (COM90xx-IO)", dev)) {
 		arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
 		return -ENODEV;
 	}
 	/* Reserve the I/O region */
 	if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE,
 			    "arcnet (COM90xx-IO)")) {
 		free_irq(dev->irq, dev);
 		return -EBUSY;
 	}

 	lp = netdev_priv(dev);
 	lp->card_name = "COM90xx I/O";
 	lp->hw.command = com90io_command;
 	lp->hw.status = com90io_status;
 	lp->hw.intmask = com90io_setmask;
 	lp->hw.reset = com90io_reset;
 	lp->hw.owner = THIS_MODULE;
 	lp->hw.copy_to_card = com90io_copy_to_card;
 	lp->hw.copy_from_card = com90io_copy_from_card;

 	lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
 	arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);

 	/* get and check the station ID from offset 1 in shmem */

 	dev->dev_addr[0] = get_buffer_byte(dev, 1);

 	err = register_netdev(dev);
 	if (err) {
 		arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
 			    ioaddr, COM9026_REG_RW_CONFIG);
 		free_irq(dev->irq, dev);
 		release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 		return err;
 	}

 	arc_printk(D_NORMAL, dev, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
 		   dev->dev_addr[0], dev->base_addr, dev->irq);

 	return 0;
 }

 /* Do a hardware reset on the card, and set up necessary registers.
  *
  * This should be called as little as possible, because it disrupts the
  * token on the network (causes a RECON) and requires a significant delay.
  *
  * However, it does make sure the card is in a defined state.
  */
 static int com90io_reset(struct net_device *dev, int really_reset)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	short ioaddr = dev->base_addr;

 	arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
 		   dev->name, arcnet_inb(ioaddr, COM9026_REG_R_STATUS));

 	if (really_reset) {
 		/* reset the card */
 		arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 		mdelay(RESETtime);
 	}
 	/* Set the thing to IO-mapped, 8-bit  mode */
 	lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag;
 	arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);

 	arcnet_outb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
 					/* clear flags & end reset */
 	arcnet_outb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);

 	/* verify that the ARCnet signature byte is present */
 	if (get_buffer_byte(dev, 0) != TESTvalue) {
 		arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
 		return 1;
 	}
 	/* enable extended (512-byte) packets */
 	arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);
 	/* done!  return success. */
 	return 0;
 }

 static void com90io_command(struct net_device *dev, int cmd)
 {
 	short ioaddr = dev->base_addr;

 	arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND);
 }

 static int com90io_status(struct net_device *dev)
 {
 	short ioaddr = dev->base_addr;

 	return arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 }

 static void com90io_setmask(struct net_device *dev, int mask)
 {
 	short ioaddr = dev->base_addr;

 	arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK);
 }

 static void com90io_copy_to_card(struct net_device *dev, int bufnum,
 				 int offset, void *buf, int count)
 {
 	TIME(dev, "put_whole_buffer", count,
 	     put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 }

 static void com90io_copy_from_card(struct net_device *dev, int bufnum,
 				   int offset, void *buf, int count)
 {
 	TIME(dev, "get_whole_buffer", count,
 	     get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 }

 static int io;			/* use the insmod io= irq= shmem= options */
 static int irq;
 static char device[9];		/* use eg. device=arc1 to change name */

 module_param(io, int, 0);
 module_param(irq, int, 0);
 module_param_string(device, device, sizeof(device), 0);
 MODULE_LICENSE("GPL");

 #ifndef MODULE
 static int __init com90io_setup(char *s)
 {
 	int ints[4];

 	s = get_options(s, 4, ints);
 	if (!ints[0])
 		return 0;
 	switch (ints[0]) {
 	default:		/* ERROR */
 		pr_err("Too many arguments\n");
 	case 2:		/* IRQ */
 		irq = ints[2];
 	case 1:		/* IO address */
 		io = ints[1];
 	}
 	if (*s)
 		snprintf(device, sizeof(device), "%s", s);
 	return 1;
 }
 __setup("com90io=", com90io_setup);
 #endif

 static struct net_device *my_dev;

 static int __init com90io_init(void)
 {
 	struct net_device *dev;
 	int err;

 	dev = alloc_arcdev(device);
 	if (!dev)
 		return -ENOMEM;

 	dev->base_addr = io;
 	dev->irq = irq;
 	if (dev->irq == 2)
 		dev->irq = 9;

 	err = com90io_probe(dev);

 	if (err) {
 		free_netdev(dev);
 		return err;
 	}

 	my_dev = dev;
 	return 0;
 }

 static void __exit com90io_exit(void)
 {
 	struct net_device *dev = my_dev;
 	int ioaddr = dev->base_addr;

 	unregister_netdev(dev);

 	/* In case the old driver is loaded later,
 	 * set the thing back to MMAP mode
 	 */
 	arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
 		    ioaddr, COM9026_REG_RW_CONFIG);

 	free_irq(dev->irq, dev);
 	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 	free_netdev(dev);
 }

 module_init(com90io_init)
 module_exit(com90io_exit)
	/*
	* Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
	*
	* Written 1997 by David Woodhouse.
	* Written 1994-1999 by Avery Pennarun.
	* Written 1999-2000 by Martin Mares <mj@ucw.cz>.
	* Derived from skeleton.c by Donald Becker.
	*
	* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
	* for sponsoring the further development of this driver.
	*
	* **********************
	*
	* The original copyright of skeleton.c was as follows:
	*
	* skeleton.c Written 1993 by Donald Becker.
	* Copyright 1993 United States Government as represented by the
	* Director, National Security Agency. This software may only be used
	* and distributed according to the terms of the GNU General Public License as
	* modified by SRC, incorporated herein by reference.
	*
	* **********************
	*
	* For more details, see drivers/net/arcnet.c
	*
	* **********************
	*/

	#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/ioport.h>
	#include <linux/delay.h>
	#include <linux/netdevice.h>
	#include <linux/bootmem.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>

	#include "arcdevice.h"
	#include "com9026.h"

	/* Internal function declarations */

	static int com90io_found(struct net_device *dev);
	static void com90io_command(struct net_device *dev, int command);
	static int com90io_status(struct net_device *dev);
	static void com90io_setmask(struct net_device *dev, int mask);
	static int com90io_reset(struct net_device *dev, int really_reset);
	static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
	void *buf, int count);
	static void com90io_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count);

	/* Handy defines for ARCnet specific stuff */

	/* The number of low I/O ports used by the card. */
	#define ARCNET_TOTAL_SIZE 16

	/****************************************************************************
	* *
	* IO-mapped operation routines *
	* *
	****************************************************************************/

	#undef ONE_AT_A_TIME_TX
	#undef ONE_AT_A_TIME_RX

	static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
	{
	int ioaddr = dev->base_addr;

	arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

	return arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
	}

	#ifdef ONE_AT_A_TIME_TX
	static void put_buffer_byte(struct net_device *dev, unsigned offset,
	u_char datum)
	{
	int ioaddr = dev->base_addr;

	arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

	arcnet_outb(datum, ioaddr, COM9026_REG_RW_MEMDATA);
	}

	#endif

	static void get_whole_buffer(struct net_device *dev, unsigned offset,
	unsigned length, char *dest)
	{
	int ioaddr = dev->base_addr;

	arcnet_outb((offset >> 8) \| AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
	arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);

	while (length--)
	#ifdef ONE_AT_A_TIME_RX
	*(dest++) = get_buffer_byte(dev, offset++);
	#else
	*(dest++) = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
	#endif
	}

	static void put_whole_buffer(struct net_device *dev, unsigned offset,
	unsigned length, char *dest)
	{
	int ioaddr = dev->base_addr;

	arcnet_outb((offset >> 8) \| AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
	arcnet_outb(offset & 0xff, ioaddr,COM9026_REG_W_ADDR_LO);

	while (length--)
	#ifdef ONE_AT_A_TIME_TX
	put_buffer_byte(dev, offset++, *(dest++));
	#else
	arcnet_outb(*(dest++), ioaddr, COM9026_REG_RW_MEMDATA);
	#endif
	}

	/* We cannot probe for an IO mapped card either, although we can check that
	* it's where we were told it was, and even autoirq
	*/
	static int __init com90io_probe(struct net_device *dev)
	{
	int ioaddr = dev->base_addr, status;
	unsigned long airqmask;

	if (BUGLVL(D_NORMAL)) {
	pr_info("%s\n", "COM90xx IO-mapped mode support (by David Woodhouse et el.)");
	pr_info("E-mail me if you actually test this driver, please!\n");
	}

	if (!ioaddr) {
	arc_printk(D_NORMAL, dev, "No autoprobe for IO mapped cards; you must specify the base address!\n");
	return -ENODEV;
	}
	if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
	arc_printk(D_INIT_REASONS, dev, "IO request_region %x-%x failed\n",
	ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
	return -ENXIO;
	}
	if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) {
	arc_printk(D_INIT_REASONS, dev, "IO address %x empty\n",
	ioaddr);
	goto err_out;
	}
	arcnet_inb(ioaddr, COM9026_REG_R_RESET);
	mdelay(RESETtime);

	status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);

	if ((status & 0x9D) != (NORXflag \| RECONflag \| TXFREEflag \| RESETflag)) {
	arc_printk(D_INIT_REASONS, dev, "Status invalid (%Xh)\n",
	status);
	goto err_out;
	}
	arc_printk(D_INIT_REASONS, dev, "Status after reset: %X\n", status);

	arcnet_outb(CFLAGScmd \| RESETclear \| CONFIGclear,
	ioaddr, COM9026_REG_W_COMMAND);

	arc_printk(D_INIT_REASONS, dev, "Status after reset acknowledged: %X\n",
	status);

	status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);

	if (status & RESETflag) {
	arc_printk(D_INIT_REASONS, dev, "Eternal reset (status=%Xh)\n",
	status);
	goto err_out;
	}
	arcnet_outb((0x16 \| IOMAPflag) & ~ENABLE16flag,
	ioaddr, COM9026_REG_RW_CONFIG);

	/* Read first loc'n of memory */

	arcnet_outb(AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
	arcnet_outb(0, ioaddr, COM9026_REG_W_ADDR_LO);

	status = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
	if (status != 0xd1) {
	arc_printk(D_INIT_REASONS, dev, "Signature byte not found (%Xh instead).\n",
	status);
	goto err_out;
	}
	if (!dev->irq) {
	/* if we do this, we're sure to get an IRQ since the
	* card has just reset and the NORXflag is on until
	* we tell it to start receiving.
	*/

	airqmask = probe_irq_on();
	arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK);
	udelay(1);
	arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK);
	dev->irq = probe_irq_off(airqmask);

	if ((int)dev->irq <= 0) {
	arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed\n");
	goto err_out;
	}
	}
	release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
	return com90io_found(dev);

	err_out:
	release_region(ioaddr, ARCNET_TOTAL_SIZE);
	return -ENODEV;
	}

	/* Set up the struct net_device associated with this card. Called after
	* probing succeeds.
	*/
	static int __init com90io_found(struct net_device *dev)
	{
	struct arcnet_local *lp;
	int ioaddr = dev->base_addr;
	int err;

	/* Reserve the irq */
	if (request_irq(dev->irq, arcnet_interrupt, 0,
	"arcnet (COM90xx-IO)", dev)) {
	arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
	return -ENODEV;
	}
	/* Reserve the I/O region */
	if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE,
	"arcnet (COM90xx-IO)")) {
	free_irq(dev->irq, dev);
	return -EBUSY;
	}

	lp = netdev_priv(dev);
	lp->card_name = "COM90xx I/O";
	lp->hw.command = com90io_command;
	lp->hw.status = com90io_status;
	lp->hw.intmask = com90io_setmask;
	lp->hw.reset = com90io_reset;
	lp->hw.owner = THIS_MODULE;
	lp->hw.copy_to_card = com90io_copy_to_card;
	lp->hw.copy_from_card = com90io_copy_from_card;

	lp->config = (0x16 \| IOMAPflag) & ~ENABLE16flag;
	arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);

	/* get and check the station ID from offset 1 in shmem */

	dev->dev_addr[0] = get_buffer_byte(dev, 1);

	err = register_netdev(dev);
	if (err) {
	arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
	ioaddr, COM9026_REG_RW_CONFIG);
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
	return err;
	}

	arc_printk(D_NORMAL, dev, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
	dev->dev_addr[0], dev->base_addr, dev->irq);

	return 0;
	}

	/* Do a hardware reset on the card, and set up necessary registers.
	*
	* This should be called as little as possible, because it disrupts the
	* token on the network (causes a RECON) and requires a significant delay.
	*
	* However, it does make sure the card is in a defined state.
	*/
	static int com90io_reset(struct net_device *dev, int really_reset)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	short ioaddr = dev->base_addr;

	arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
	dev->name, arcnet_inb(ioaddr, COM9026_REG_R_STATUS));

	if (really_reset) {
	/* reset the card */
	arcnet_inb(ioaddr, COM9026_REG_R_RESET);
	mdelay(RESETtime);
	}
	/* Set the thing to IO-mapped, 8-bit mode */
	lp->config = (0x1C \| IOMAPflag) & ~ENABLE16flag;
	arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);

	arcnet_outb(CFLAGScmd \| RESETclear, ioaddr, COM9026_REG_W_COMMAND);
	/* clear flags & end reset */
	arcnet_outb(CFLAGScmd \| CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);

	/* verify that the ARCnet signature byte is present */
	if (get_buffer_byte(dev, 0) != TESTvalue) {
	arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
	return 1;
	}
	/* enable extended (512-byte) packets */
	arcnet_outb(CONFIGcmd \| EXTconf, ioaddr, COM9026_REG_W_COMMAND);
	/* done! return success. */
	return 0;
	}

	static void com90io_command(struct net_device *dev, int cmd)
	{
	short ioaddr = dev->base_addr;

	arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND);
	}

	static int com90io_status(struct net_device *dev)
	{
	short ioaddr = dev->base_addr;

	return arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
	}

	static void com90io_setmask(struct net_device *dev, int mask)
	{
	short ioaddr = dev->base_addr;

	arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK);
	}

	static void com90io_copy_to_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count)
	{
	TIME(dev, "put_whole_buffer", count,
	put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
	}

	static void com90io_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count)
	{
	TIME(dev, "get_whole_buffer", count,
	get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
	}

	static int io; /* use the insmod io= irq= shmem= options */
	static int irq;
	static char device[9]; /* use eg. device=arc1 to change name */

	module_param(io, int, 0);
	module_param(irq, int, 0);
	module_param_string(device, device, sizeof(device), 0);
	MODULE_LICENSE("GPL");

	#ifndef MODULE
	static int __init com90io_setup(char *s)
	{
	int ints[4];

	s = get_options(s, 4, ints);
	if (!ints[0])
	return 0;
	switch (ints[0]) {
	default: /* ERROR */
	pr_err("Too many arguments\n");
	case 2: /* IRQ */
	irq = ints[2];
	case 1: /* IO address */
	io = ints[1];
	}
	if (*s)
	snprintf(device, sizeof(device), "%s", s);
	return 1;
	}
	__setup("com90io=", com90io_setup);
	#endif

	static struct net_device *my_dev;

	static int __init com90io_init(void)
	{
	struct net_device *dev;
	int err;

	dev = alloc_arcdev(device);
	if (!dev)
	return -ENOMEM;

	dev->base_addr = io;
	dev->irq = irq;
	if (dev->irq == 2)
	dev->irq = 9;

	err = com90io_probe(dev);

	if (err) {
	free_netdev(dev);
	return err;
	}

	my_dev = dev;
	return 0;
	}

	static void __exit com90io_exit(void)
	{
	struct net_device *dev = my_dev;
	int ioaddr = dev->base_addr;

	unregister_netdev(dev);

	/* In case the old driver is loaded later,
	* set the thing back to MMAP mode
	*/
	arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
	ioaddr, COM9026_REG_RW_CONFIG);

	free_irq(dev->irq, dev);
	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
	free_netdev(dev);
	}

	module_init(com90io_init)
	module_exit(com90io_exit)