drivers/net/arcnet/com90io.c - kernel/mindspeed - 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
  *
  * **********************
  */
 #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 <asm/io.h>
 #include <linux/arcdevice.h>


 #define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"


 /* 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

 /* COM 9026 controller chip --> ARCnet register addresses */
 #define _INTMASK (ioaddr+0)	/* writable */
 #define _STATUS  (ioaddr+0)	/* readable */
 #define _COMMAND (ioaddr+1)	/* writable, returns random vals on read (?) */
 #define _RESET  (ioaddr+8)	/* software reset (on read) */
 #define _MEMDATA  (ioaddr+12)	/* Data port for IO-mapped memory */
 #define _ADDR_HI  (ioaddr+15)	/* Control registers for said */
 #define _ADDR_LO  (ioaddr+14)
 #define _CONFIG  (ioaddr+2)	/* Configuration register */

 #undef ASTATUS
 #undef ACOMMAND
 #undef AINTMASK

 #define ASTATUS()	inb(_STATUS)
 #define ACOMMAND(cmd) outb((cmd),_COMMAND)
 #define AINTMASK(msk)	outb((msk),_INTMASK)
 #define SETCONF() 	outb((lp->config),_CONFIG)


 /****************************************************************************
  *                                                                          *
  * 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;

 	outb(offset >> 8, _ADDR_HI);
 	outb(offset & 0xff, _ADDR_LO);

 	return inb(_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;

 	outb(offset >> 8, _ADDR_HI);
 	outb(offset & 0xff, _ADDR_LO);

 	outb(datum, _MEMDATA);
 }

 #endif


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

 	outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
 	outb(offset & 0xff, _ADDR_LO);

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

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

 	outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
 	outb(offset & 0xff, _ADDR_LO);

 	while (length--)
 #ifdef ONE_AT_A_TIME_TX
 		put_buffer_byte(dev, offset++, *(dest++));
 #else
 		outb(*(dest++), _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;

 	BUGLVL(D_NORMAL) printk(VERSION);
 	BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n");

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

 	status = ASTATUS();

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

 	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);

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

 	status = ASTATUS();

 	if (status & RESETflag) {
 		BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status);
 		goto err_out;
 	}
 	outb((0x16 | IOMAPflag) & ~ENABLE16flag, _CONFIG);

 	/* Read first loc'n of memory */

 	outb(AUTOINCflag, _ADDR_HI);
 	outb(0, _ADDR_LO);

 	if ((status = inb(_MEMDATA)) != 0xd1) {
 		BUGMSG(D_INIT_REASONS, "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();
 		outb(NORXflag, _INTMASK);
 		udelay(1);
 		outb(0, _INTMASK);
 		dev->irq = probe_irq_off(airqmask);

 		if ((int)dev->irq <= 0) {
 			BUGMSG(D_INIT_REASONS, "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)) {
 		BUGMSG(D_NORMAL, "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;
 	SETCONF();

 	/* 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) {
 		outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
 		free_irq(dev->irq, dev);
 		release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 		return err;
 	}

 	BUGMSG(D_NORMAL, "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;

 	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());

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

 	ACOMMAND(CFLAGScmd | RESETclear);	/* clear flags & end reset */
 	ACOMMAND(CFLAGScmd | CONFIGclear);

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

 	/* done!  return success. */
 	return 0;
 }


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

 	ACOMMAND(cmd);
 }


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

 	return ASTATUS();
 }


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

 	AINTMASK(mask);
 }

 static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
 				 void *buf, int count)
 {
 	TIME("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("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 */
 		printk("com90io: 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);

 	/* Set the thing back to MMAP mode, in case the old driver is loaded later */
 	outb((inb(_CONFIG) & ~IOMAPflag), _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
	*
	* **********************
	*/
	#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 <asm/io.h>
	#include <linux/arcdevice.h>


	#define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"


	/* 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

	/* COM 9026 controller chip --> ARCnet register addresses */
	#define _INTMASK (ioaddr+0) /* writable */
	#define _STATUS (ioaddr+0) /* readable */
	#define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */
	#define _RESET (ioaddr+8) /* software reset (on read) */
	#define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */
	#define _ADDR_HI (ioaddr+15) /* Control registers for said */
	#define _ADDR_LO (ioaddr+14)
	#define _CONFIG (ioaddr+2) /* Configuration register */

	#undef ASTATUS
	#undef ACOMMAND
	#undef AINTMASK

	#define ASTATUS() inb(_STATUS)
	#define ACOMMAND(cmd) outb((cmd),_COMMAND)
	#define AINTMASK(msk) outb((msk),_INTMASK)
	#define SETCONF() outb((lp->config),_CONFIG)


	/****************************************************************************
	* *
	* 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;

	outb(offset >> 8, _ADDR_HI);
	outb(offset & 0xff, _ADDR_LO);

	return inb(_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;

	outb(offset >> 8, _ADDR_HI);
	outb(offset & 0xff, _ADDR_LO);

	outb(datum, _MEMDATA);
	}

	#endif


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

	outb((offset >> 8) \| AUTOINCflag, _ADDR_HI);
	outb(offset & 0xff, _ADDR_LO);

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

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

	outb((offset >> 8) \| AUTOINCflag, _ADDR_HI);
	outb(offset & 0xff, _ADDR_LO);

	while (length--)
	#ifdef ONE_AT_A_TIME_TX
	put_buffer_byte(dev, offset++, *(dest++));
	#else
	outb(*(dest++), _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;

	BUGLVL(D_NORMAL) printk(VERSION);
	BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n");

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

	status = ASTATUS();

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

	ACOMMAND(CFLAGScmd \| RESETclear \| CONFIGclear);

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

	status = ASTATUS();

	if (status & RESETflag) {
	BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status);
	goto err_out;
	}
	outb((0x16 \| IOMAPflag) & ~ENABLE16flag, _CONFIG);

	/* Read first loc'n of memory */

	outb(AUTOINCflag, _ADDR_HI);
	outb(0, _ADDR_LO);

	if ((status = inb(_MEMDATA)) != 0xd1) {
	BUGMSG(D_INIT_REASONS, "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();
	outb(NORXflag, _INTMASK);
	udelay(1);
	outb(0, _INTMASK);
	dev->irq = probe_irq_off(airqmask);

	if ((int)dev->irq <= 0) {
	BUGMSG(D_INIT_REASONS, "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)) {
	BUGMSG(D_NORMAL, "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;
	SETCONF();

	/* 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) {
	outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
	return err;
	}

	BUGMSG(D_NORMAL, "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;

	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());

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

	ACOMMAND(CFLAGScmd \| RESETclear); /* clear flags & end reset */
	ACOMMAND(CFLAGScmd \| CONFIGclear);

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

	/* done! return success. */
	return 0;
	}


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

	ACOMMAND(cmd);
	}


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

	return ASTATUS();
	}


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

	AINTMASK(mask);
	}

	static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
	void *buf, int count)
	{
	TIME("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("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 */
	printk("com90io: 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);

	/* Set the thing back to MMAP mode, in case the old driver is loaded later */
	outb((inb(_CONFIG) & ~IOMAPflag), _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)