drivers/net/arcnet/arc-rimi.c - linux - Git at Google

 /*
  * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
  *
  * 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/memblock.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

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

 /* Internal function declarations */

 static int arcrimi_probe(struct net_device *dev);
 static int arcrimi_found(struct net_device *dev);
 static void arcrimi_command(struct net_device *dev, int command);
 static int arcrimi_status(struct net_device *dev);
 static void arcrimi_setmask(struct net_device *dev, int mask);
 static int arcrimi_reset(struct net_device *dev, int really_reset);
 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
 				 void *buf, int count);
 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
 				   int offset, void *buf, int count);

 /* Handy defines for ARCnet specific stuff */

 /* Amount of I/O memory used by the card */
 #define BUFFER_SIZE	(512)
 #define MIRROR_SIZE	(BUFFER_SIZE * 4)

 /* We cannot probe for a RIM I card; one reason is I don't know how to reset
  * them.  In fact, we can't even get their node ID automatically.  So, we
  * need to be passed a specific shmem address, IRQ, and node ID.
  */
 static int __init arcrimi_probe(struct net_device *dev)
 {
 	if (BUGLVL(D_NORMAL)) {
 		pr_info("%s\n", "RIM I (entirely mem-mapped) support");
 		pr_info("E-mail me if you actually test the RIM I driver, please!\n");
 		pr_info("Given: node %02Xh, shmem %lXh, irq %d\n",
 			dev->dev_addr[0], dev->mem_start, dev->irq);
 	}

 	if (dev->mem_start <= 0 || dev->irq <= 0) {
 		if (BUGLVL(D_NORMAL))
 			pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n");
 		return -ENODEV;
 	}
 	if (dev->dev_addr[0] == 0) {
 		if (BUGLVL(D_NORMAL))
 			pr_err("You need to specify your card's station ID!\n");
 		return -ENODEV;
 	}
 	/* Grab the memory region at mem_start for MIRROR_SIZE bytes.
 	 * Later in arcrimi_found() the real size will be determined
 	 * and this reserve will be released and the correct size
 	 * will be taken.
 	 */
 	if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
 		if (BUGLVL(D_NORMAL))
 			pr_notice("Card memory already allocated\n");
 		return -ENODEV;
 	}
 	return arcrimi_found(dev);
 }

 static int check_mirror(unsigned long addr, size_t size)
 {
 	void __iomem *p;
 	int res = -1;

 	if (!request_mem_region(addr, size, "arcnet (90xx)"))
 		return -1;

 	p = ioremap(addr, size);
 	if (p) {
 		if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue)
 			res = 1;
 		else
 			res = 0;
 		iounmap(p);
 	}

 	release_mem_region(addr, size);
 	return res;
 }

 /* Set up the struct net_device associated with this card.
  * Called after probing succeeds.
  */
 static int __init arcrimi_found(struct net_device *dev)
 {
 	struct arcnet_local *lp;
 	unsigned long first_mirror, last_mirror, shmem;
 	void __iomem *p;
 	int mirror_size;
 	int err;

 	p = ioremap(dev->mem_start, MIRROR_SIZE);
 	if (!p) {
 		release_mem_region(dev->mem_start, MIRROR_SIZE);
 		arc_printk(D_NORMAL, dev, "Can't ioremap\n");
 		return -ENODEV;
 	}

 	/* reserve the irq */
 	if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
 		iounmap(p);
 		release_mem_region(dev->mem_start, MIRROR_SIZE);
 		arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
 		return -ENODEV;
 	}

 	shmem = dev->mem_start;
 	arcnet_writeb(TESTvalue, p, COM9026_REG_W_INTMASK);
 	arcnet_writeb(TESTvalue, p, COM9026_REG_W_COMMAND);
 					/* actually the station/node ID */

 	/* find the real shared memory start/end points, including mirrors */

 	/* guess the actual size of one "memory mirror" - the number of
 	 * bytes between copies of the shared memory.  On most cards, it's
 	 * 2k (or there are no mirrors at all) but on some, it's 4k.
 	 */
 	mirror_size = MIRROR_SIZE;
 	if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
 	    check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
 	    check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
 		mirror_size = 2 * MIRROR_SIZE;

 	first_mirror = shmem - mirror_size;
 	while (check_mirror(first_mirror, mirror_size) == 1)
 		first_mirror -= mirror_size;
 	first_mirror += mirror_size;

 	last_mirror = shmem + mirror_size;
 	while (check_mirror(last_mirror, mirror_size) == 1)
 		last_mirror += mirror_size;
 	last_mirror -= mirror_size;

 	dev->mem_start = first_mirror;
 	dev->mem_end = last_mirror + MIRROR_SIZE - 1;

 	/* initialize the rest of the device structure. */

 	lp = netdev_priv(dev);
 	lp->card_name = "RIM I";
 	lp->hw.command = arcrimi_command;
 	lp->hw.status = arcrimi_status;
 	lp->hw.intmask = arcrimi_setmask;
 	lp->hw.reset = arcrimi_reset;
 	lp->hw.owner = THIS_MODULE;
 	lp->hw.copy_to_card = arcrimi_copy_to_card;
 	lp->hw.copy_from_card = arcrimi_copy_from_card;

 	/* re-reserve the memory region - arcrimi_probe() alloced this reqion
 	 * but didn't know the real size.  Free that region and then re-get
 	 * with the correct size.  There is a VERY slim chance this could
 	 * fail.
 	 */
 	iounmap(p);
 	release_mem_region(shmem, MIRROR_SIZE);
 	if (!request_mem_region(dev->mem_start,
 				dev->mem_end - dev->mem_start + 1,
 				"arcnet (90xx)")) {
 		arc_printk(D_NORMAL, dev, "Card memory already allocated\n");
 		goto err_free_irq;
 	}

 	lp->mem_start = ioremap(dev->mem_start,
 				dev->mem_end - dev->mem_start + 1);
 	if (!lp->mem_start) {
 		arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
 		goto err_release_mem;
 	}

 	/* get and check the station ID from offset 1 in shmem */
 	dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);

 	arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n",
 		   dev->dev_addr[0],
 		   dev->irq, dev->mem_start,
 		   (dev->mem_end - dev->mem_start + 1) / mirror_size,
 		   mirror_size);

 	err = register_netdev(dev);
 	if (err)
 		goto err_unmap;

 	return 0;

 err_unmap:
 	iounmap(lp->mem_start);
 err_release_mem:
 	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 err_free_irq:
 	free_irq(dev->irq, dev);
 	return -EIO;
 }

 /* 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 arcrimi_reset(struct net_device *dev, int really_reset)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->mem_start + 0x800;

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

 	if (really_reset) {
 		arcnet_writeb(TESTvalue, ioaddr, -0x800);	/* fake reset */
 		return 0;
 	}
 	/* clear flags & end reset */
 	arcnet_writeb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
 	arcnet_writeb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);

 	/* enable extended (512-byte) packets */
 	arcnet_writeb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);

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

 static void arcrimi_setmask(struct net_device *dev, int mask)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->mem_start + 0x800;

 	arcnet_writeb(mask, ioaddr, COM9026_REG_W_INTMASK);
 }

 static int arcrimi_status(struct net_device *dev)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->mem_start + 0x800;

 	return arcnet_readb(ioaddr, COM9026_REG_R_STATUS);
 }

 static void arcrimi_command(struct net_device *dev, int cmd)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->mem_start + 0x800;

 	arcnet_writeb(cmd, ioaddr, COM9026_REG_W_COMMAND);
 }

 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
 				 void *buf, int count)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;

 	TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 }

 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
 				   int offset, void *buf, int count)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;

 	TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 }

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

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

 static struct net_device *my_dev;

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

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

 	if (node && node != 0xff)
 		dev->dev_addr[0] = node;

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

 	if (arcrimi_probe(dev)) {
 		free_arcdev(dev);
 		return -EIO;
 	}

 	my_dev = dev;
 	return 0;
 }

 static void __exit arc_rimi_exit(void)
 {
 	struct net_device *dev = my_dev;
 	struct arcnet_local *lp = netdev_priv(dev);

 	unregister_netdev(dev);
 	iounmap(lp->mem_start);
 	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 	free_irq(dev->irq, dev);
 	free_arcdev(dev);
 }

 #ifndef MODULE
 static int __init arcrimi_setup(char *s)
 {
 	int ints[8];

 	s = get_options(s, 8, ints);
 	if (!ints[0])
 		return 1;
 	switch (ints[0]) {
 	default:		/* ERROR */
 		pr_err("Too many arguments\n");
 		fallthrough;
 	case 3:		/* Node ID */
 		node = ints[3];
 		fallthrough;
 	case 2:		/* IRQ */
 		irq = ints[2];
 		fallthrough;
 	case 1:		/* IO address */
 		io = ints[1];
 	}
 	if (*s)
 		snprintf(device, sizeof(device), "%s", s);
 	return 1;
 }
 __setup("arcrimi=", arcrimi_setup);
 #endif				/* MODULE */

 module_init(arc_rimi_init)
 module_exit(arc_rimi_exit)
	/*
	* Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
	*
	* 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/memblock.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>

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

	/* Internal function declarations */

	static int arcrimi_probe(struct net_device *dev);
	static int arcrimi_found(struct net_device *dev);
	static void arcrimi_command(struct net_device *dev, int command);
	static int arcrimi_status(struct net_device *dev);
	static void arcrimi_setmask(struct net_device *dev, int mask);
	static int arcrimi_reset(struct net_device *dev, int really_reset);
	static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
	void *buf, int count);
	static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count);

	/* Handy defines for ARCnet specific stuff */

	/* Amount of I/O memory used by the card */
	#define BUFFER_SIZE (512)
	#define MIRROR_SIZE (BUFFER_SIZE * 4)

	/* We cannot probe for a RIM I card; one reason is I don't know how to reset
	* them. In fact, we can't even get their node ID automatically. So, we
	* need to be passed a specific shmem address, IRQ, and node ID.
	*/
	static int __init arcrimi_probe(struct net_device *dev)
	{
	if (BUGLVL(D_NORMAL)) {
	pr_info("%s\n", "RIM I (entirely mem-mapped) support");
	pr_info("E-mail me if you actually test the RIM I driver, please!\n");
	pr_info("Given: node %02Xh, shmem %lXh, irq %d\n",
	dev->dev_addr[0], dev->mem_start, dev->irq);
	}

	if (dev->mem_start <= 0 \|\| dev->irq <= 0) {
	if (BUGLVL(D_NORMAL))
	pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n");
	return -ENODEV;
	}
	if (dev->dev_addr[0] == 0) {
	if (BUGLVL(D_NORMAL))
	pr_err("You need to specify your card's station ID!\n");
	return -ENODEV;
	}
	/* Grab the memory region at mem_start for MIRROR_SIZE bytes.
	* Later in arcrimi_found() the real size will be determined
	* and this reserve will be released and the correct size
	* will be taken.
	*/
	if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
	if (BUGLVL(D_NORMAL))
	pr_notice("Card memory already allocated\n");
	return -ENODEV;
	}
	return arcrimi_found(dev);
	}

	static int check_mirror(unsigned long addr, size_t size)
	{
	void __iomem *p;
	int res = -1;

	if (!request_mem_region(addr, size, "arcnet (90xx)"))
	return -1;

	p = ioremap(addr, size);
	if (p) {
	if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue)
	res = 1;
	else
	res = 0;
	iounmap(p);
	}

	release_mem_region(addr, size);
	return res;
	}

	/* Set up the struct net_device associated with this card.
	* Called after probing succeeds.
	*/
	static int __init arcrimi_found(struct net_device *dev)
	{
	struct arcnet_local *lp;
	unsigned long first_mirror, last_mirror, shmem;
	void __iomem *p;
	int mirror_size;
	int err;

	p = ioremap(dev->mem_start, MIRROR_SIZE);
	if (!p) {
	release_mem_region(dev->mem_start, MIRROR_SIZE);
	arc_printk(D_NORMAL, dev, "Can't ioremap\n");
	return -ENODEV;
	}

	/* reserve the irq */
	if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
	iounmap(p);
	release_mem_region(dev->mem_start, MIRROR_SIZE);
	arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
	return -ENODEV;
	}

	shmem = dev->mem_start;
	arcnet_writeb(TESTvalue, p, COM9026_REG_W_INTMASK);
	arcnet_writeb(TESTvalue, p, COM9026_REG_W_COMMAND);
	/* actually the station/node ID */

	/* find the real shared memory start/end points, including mirrors */

	/* guess the actual size of one "memory mirror" - the number of
	* bytes between copies of the shared memory. On most cards, it's
	* 2k (or there are no mirrors at all) but on some, it's 4k.
	*/
	mirror_size = MIRROR_SIZE;
	if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
	check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
	check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
	mirror_size = 2 * MIRROR_SIZE;

	first_mirror = shmem - mirror_size;
	while (check_mirror(first_mirror, mirror_size) == 1)
	first_mirror -= mirror_size;
	first_mirror += mirror_size;

	last_mirror = shmem + mirror_size;
	while (check_mirror(last_mirror, mirror_size) == 1)
	last_mirror += mirror_size;
	last_mirror -= mirror_size;

	dev->mem_start = first_mirror;
	dev->mem_end = last_mirror + MIRROR_SIZE - 1;

	/* initialize the rest of the device structure. */

	lp = netdev_priv(dev);
	lp->card_name = "RIM I";
	lp->hw.command = arcrimi_command;
	lp->hw.status = arcrimi_status;
	lp->hw.intmask = arcrimi_setmask;
	lp->hw.reset = arcrimi_reset;
	lp->hw.owner = THIS_MODULE;
	lp->hw.copy_to_card = arcrimi_copy_to_card;
	lp->hw.copy_from_card = arcrimi_copy_from_card;

	/* re-reserve the memory region - arcrimi_probe() alloced this reqion
	* but didn't know the real size. Free that region and then re-get
	* with the correct size. There is a VERY slim chance this could
	* fail.
	*/
	iounmap(p);
	release_mem_region(shmem, MIRROR_SIZE);
	if (!request_mem_region(dev->mem_start,
	dev->mem_end - dev->mem_start + 1,
	"arcnet (90xx)")) {
	arc_printk(D_NORMAL, dev, "Card memory already allocated\n");
	goto err_free_irq;
	}

	lp->mem_start = ioremap(dev->mem_start,
	dev->mem_end - dev->mem_start + 1);
	if (!lp->mem_start) {
	arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
	goto err_release_mem;
	}

	/* get and check the station ID from offset 1 in shmem */
	dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);

	arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n",
	dev->dev_addr[0],
	dev->irq, dev->mem_start,
	(dev->mem_end - dev->mem_start + 1) / mirror_size,
	mirror_size);

	err = register_netdev(dev);
	if (err)
	goto err_unmap;

	return 0;

	err_unmap:
	iounmap(lp->mem_start);
	err_release_mem:
	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
	err_free_irq:
	free_irq(dev->irq, dev);
	return -EIO;
	}

	/* 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 arcrimi_reset(struct net_device *dev, int really_reset)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->mem_start + 0x800;

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

	if (really_reset) {
	arcnet_writeb(TESTvalue, ioaddr, -0x800); /* fake reset */
	return 0;
	}
	/* clear flags & end reset */
	arcnet_writeb(CFLAGScmd \| RESETclear, ioaddr, COM9026_REG_W_COMMAND);
	arcnet_writeb(CFLAGScmd \| CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);

	/* enable extended (512-byte) packets */
	arcnet_writeb(CONFIGcmd \| EXTconf, ioaddr, COM9026_REG_W_COMMAND);

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

	static void arcrimi_setmask(struct net_device *dev, int mask)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->mem_start + 0x800;

	arcnet_writeb(mask, ioaddr, COM9026_REG_W_INTMASK);
	}

	static int arcrimi_status(struct net_device *dev)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->mem_start + 0x800;

	return arcnet_readb(ioaddr, COM9026_REG_R_STATUS);
	}

	static void arcrimi_command(struct net_device *dev, int cmd)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->mem_start + 0x800;

	arcnet_writeb(cmd, ioaddr, COM9026_REG_W_COMMAND);
	}

	static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
	void *buf, int count)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem memaddr = lp->mem_start + 0x800 + bufnum 512 + offset;

	TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
	}

	static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	void __iomem memaddr = lp->mem_start + 0x800 + bufnum 512 + offset;

	TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
	}

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

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

	static struct net_device *my_dev;

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

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

	if (node && node != 0xff)
	dev->dev_addr[0] = node;

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

	if (arcrimi_probe(dev)) {
	free_arcdev(dev);
	return -EIO;
	}

	my_dev = dev;
	return 0;
	}

	static void __exit arc_rimi_exit(void)
	{
	struct net_device *dev = my_dev;
	struct arcnet_local *lp = netdev_priv(dev);

	unregister_netdev(dev);
	iounmap(lp->mem_start);
	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
	free_irq(dev->irq, dev);
	free_arcdev(dev);
	}

	#ifndef MODULE
	static int __init arcrimi_setup(char *s)
	{
	int ints[8];

	s = get_options(s, 8, ints);
	if (!ints[0])
	return 1;
	switch (ints[0]) {
	default: /* ERROR */
	pr_err("Too many arguments\n");
	fallthrough;
	case 3: /* Node ID */
	node = ints[3];
	fallthrough;
	case 2: /* IRQ */
	irq = ints[2];
	fallthrough;
	case 1: /* IO address */
	io = ints[1];
	}
	if (*s)
	snprintf(device, sizeof(device), "%s", s);
	return 1;
	}
	__setup("arcrimi=", arcrimi_setup);
	#endif /* MODULE */

	module_init(arc_rimi_init)
	module_exit(arc_rimi_exit)