patch-2.3.36 linux/drivers/net/arcnet/com90xx.c

• Lines: 710
• Date: Sun Jan 2 00:46:32 2000
• Orig file: v2.3.35/linux/drivers/net/arcnet/com90xx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/drivers/net/arcnet/com90xx.c linux/drivers/net/arcnet/com90xx.c
@@ -0,0 +1,709 @@
+/*
+ * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
+ * 
+ * Written 1994-1999 by Avery Pennarun.
+ * Written 1999 by Martin Mares <mj@suse.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 Public License as
+ * modified by SRC, incorporated herein by reference.
+ *
+ * **********************
+ *
+ * For more details, see drivers/net/arcnet.c
+ *
+ * **********************
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/bootmem.h>
+#include <asm/io.h>
+#include <linux/arcdevice.h>
+
+
+#define VERSION "arcnet: COM90xx chipset support\n"
+
+
+/* Define this to speed up the autoprobe by assuming if only one io port and
+ * shmem are left in the list at Stage 5, they must correspond to each
+ * other.
+ *
+ * This is undefined by default because it might not always be true, and the
+ * extra check makes the autoprobe even more careful.  Speed demons can turn
+ * it on - I think it should be fine if you only have one ARCnet card
+ * installed.
+ *
+ * If no ARCnet cards are installed, this delay never happens anyway and thus
+ * the option has no effect.
+ */
+#undef FAST_PROBE
+
+
+/* Internal function declarations */
+static int com90xx_found(struct net_device *dev, int ioaddr, int airq,
+			 u_long shmem);
+static void com90xx_command(struct net_device *dev, int command);
+static int com90xx_status(struct net_device *dev);
+static void com90xx_setmask(struct net_device *dev, int mask);
+static int com90xx_reset(struct net_device *dev, int really_reset);
+static void com90xx_openclose(struct net_device *dev, bool open);
+static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count);
+static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count);
+
+/* Known ARCnet cards */
+
+static struct net_device *cards[16];
+static int numcards;
+
+/* Handy defines for ARCnet specific stuff */
+
+/* The number of low I/O ports used by the card */
+#define ARCNET_TOTAL_SIZE	16
+
+/* Amount of I/O memory used by the card */
+#define BUFFER_SIZE (512)
+#define MIRROR_SIZE (BUFFER_SIZE*4)
+
+/* 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 _CONFIG  (ioaddr+2)	/* Configuration register */
+#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)
+
+#undef ASTATUS
+#undef ACOMMAND
+#undef AINTMASK
+
+#define ASTATUS()	inb(_STATUS)
+#define ACOMMAND(cmd) 	outb((cmd),_COMMAND)
+#define AINTMASK(msk)	outb((msk),_INTMASK)
+
+
+static int com90xx_skip_probe __initdata = 0;
+
+int __init com90xx_probe(struct net_device *dev)
+{
+	int count, status, ioaddr, numprint, airq, retval = -ENODEV,
+	 openparen = 0;
+	unsigned long airqmask;
+	int ports[(0x3f0 - 0x200) / 16 + 1] =
+	{0};
+	u_long shmems[(0xFF800 - 0xA0000) / 2048 + 1] =
+	{0};
+	int numports, numshmems, *port;
+	u_long *shmem;
+
+	if (!dev && com90xx_skip_probe)
+		return -ENODEV;
+
+#ifndef MODULE
+	arcnet_init();
+#endif
+
+	BUGLVL(D_NORMAL) printk(VERSION);
+
+	/* set up the arrays where we'll store the possible probe addresses */
+	numports = numshmems = 0;
+	if (dev && dev->base_addr)
+		ports[numports++] = dev->base_addr;
+	else
+		for (count = 0x200; count <= 0x3f0; count += 16)
+			ports[numports++] = count;
+	if (dev && dev->mem_start)
+		shmems[numshmems++] = dev->mem_start;
+	else
+		for (count = 0xA0000; count <= 0xFF800; count += 2048)
+			shmems[numshmems++] = count;
+
+	/* Stage 1: abandon any reserved ports, or ones with status==0xFF
+	 * (empty), and reset any others by reading the reset port.
+	 */
+	numprint = -1;
+	for (port = &ports[0]; port - ports < numports; port++) {
+		numprint++;
+		numprint %= 8;
+		if (!numprint) {
+			BUGMSG2(D_INIT, "\n");
+			BUGMSG(D_INIT, "S1: ");
+		}
+		BUGMSG2(D_INIT, "%Xh ", *port);
+
+		ioaddr = *port;
+
+		if (check_region(*port, ARCNET_TOTAL_SIZE)) {
+			BUGMSG2(D_INIT_REASONS, "(check_region)\n");
+			BUGMSG(D_INIT_REASONS, "S1: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*port = ports[numports - 1];
+			numports--;
+			port--;
+			continue;
+		}
+		if (ASTATUS() == 0xFF) {
+			BUGMSG2(D_INIT_REASONS, "(empty)\n");
+			BUGMSG(D_INIT_REASONS, "S1: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*port = ports[numports - 1];
+			numports--;
+			port--;
+			continue;
+		}
+		inb(_RESET);	/* begin resetting card */
+
+		BUGMSG2(D_INIT_REASONS, "\n");
+		BUGMSG(D_INIT_REASONS, "S1: ");
+		BUGLVL(D_INIT_REASONS) numprint = 0;
+	}
+	BUGMSG2(D_INIT, "\n");
+
+	if (!numports) {
+		BUGMSG(D_NORMAL, "S1: No ARCnet cards found.\n");
+		return -ENODEV;
+	}
+	/* Stage 2: we have now reset any possible ARCnet cards, so we can't
+	 * do anything until they finish.  If D_INIT, print the list of
+	 * cards that are left.
+	 */
+	numprint = -1;
+	for (port = &ports[0]; port - ports < numports; port++) {
+		numprint++;
+		numprint %= 8;
+		if (!numprint) {
+			BUGMSG2(D_INIT, "\n");
+			BUGMSG(D_INIT, "S2: ");
+		}
+		BUGMSG2(D_INIT, "%Xh ", *port);
+	}
+	BUGMSG2(D_INIT, "\n");
+	mdelay(RESETtime);
+
+	/* Stage 3: abandon any shmem addresses that don't have the signature
+	 * 0xD1 byte in the right place, or are read-only.
+	 */
+	numprint = -1;
+	for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
+		u_long ptr = *shmem;
+
+		numprint++;
+		numprint %= 8;
+		if (!numprint) {
+			BUGMSG2(D_INIT, "\n");
+			BUGMSG(D_INIT, "S3: ");
+		}
+		BUGMSG2(D_INIT, "%lXh ", *shmem);
+
+		if (check_mem_region(*shmem, BUFFER_SIZE)) {
+			BUGMSG2(D_INIT_REASONS, "(check_mem_region)\n");
+			BUGMSG(D_INIT_REASONS, "Stage 3: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*shmem = shmems[numshmems - 1];
+			numshmems--;
+			shmem--;
+			continue;
+		}
+		if (isa_readb(ptr) != TESTvalue) {
+			BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
+				isa_readb(ptr), TESTvalue);
+			BUGMSG(D_INIT_REASONS, "S3: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*shmem = shmems[numshmems - 1];
+			numshmems--;
+			shmem--;
+			continue;
+		}
+		/* By writing 0x42 to the TESTvalue location, we also make
+		 * sure no "mirror" shmem areas show up - if they occur
+		 * in another pass through this loop, they will be discarded
+		 * because *cptr != TESTvalue.
+		 */
+		isa_writeb(0x42, ptr);
+		if (isa_readb(ptr) != 0x42) {
+			BUGMSG2(D_INIT_REASONS, "(read only)\n");
+			BUGMSG(D_INIT_REASONS, "S3: ");
+			*shmem = shmems[numshmems - 1];
+			numshmems--;
+			shmem--;
+			continue;
+		}
+		BUGMSG2(D_INIT_REASONS, "\n");
+		BUGMSG(D_INIT_REASONS, "S3: ");
+		BUGLVL(D_INIT_REASONS) numprint = 0;
+	}
+	BUGMSG2(D_INIT, "\n");
+
+	if (!numshmems) {
+		BUGMSG(D_NORMAL, "S3: No ARCnet cards found.\n");
+		return -ENODEV;
+	}
+	/* Stage 4: something of a dummy, to report the shmems that are
+	 * still possible after stage 3.
+	 */
+	numprint = -1;
+	for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
+		numprint++;
+		numprint %= 8;
+		if (!numprint) {
+			BUGMSG2(D_INIT, "\n");
+			BUGMSG(D_INIT, "S4: ");
+		}
+		BUGMSG2(D_INIT, "%lXh ", *shmem);
+	}
+	BUGMSG2(D_INIT, "\n");
+
+	/* Stage 5: for any ports that have the correct status, can disable
+	 * the RESET flag, and (if no irq is given) generate an autoirq,
+	 * register an ARCnet device.
+	 *
+	 * Currently, we can only register one device per probe, so quit
+	 * after the first one is found.
+	 */
+	numprint = -1;
+	for (port = &ports[0]; port - ports < numports; port++) {
+		numprint++;
+		numprint %= 8;
+		if (!numprint) {
+			BUGMSG2(D_INIT, "\n");
+			BUGMSG(D_INIT, "S5: ");
+		}
+		BUGMSG2(D_INIT, "%Xh ", *port);
+
+		ioaddr = *port;
+		status = ASTATUS();
+
+		if ((status & 0x9D)
+		    != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
+			BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
+			BUGMSG(D_INIT_REASONS, "S5: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*port = ports[numports - 1];
+			numports--;
+			port--;
+			continue;
+		}
+		ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
+		status = ASTATUS();
+		if (status & RESETflag) {
+			BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
+				status);
+			BUGMSG(D_INIT_REASONS, "S5: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+			*port = ports[numports - 1];
+			numports--;
+			port--;
+			continue;
+		}
+		/* skip this completely if an IRQ was given, because maybe
+		 * we're on a machine that locks during autoirq!
+		 */
+		if (!dev || !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();
+			AINTMASK(NORXflag);
+			udelay(1);
+			AINTMASK(0);
+			airq = probe_irq_off(airqmask);
+
+			if (airq <= 0) {
+				BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
+				BUGMSG(D_INIT_REASONS, "S5: ");
+				BUGLVL(D_INIT_REASONS) numprint = 0;
+				*port = ports[numports - 1];
+				numports--;
+				port--;
+				continue;
+			}
+		} else {
+			airq = dev->irq;
+		}
+
+		BUGMSG2(D_INIT, "(%d,", airq);
+		openparen = 1;
+
+		/* Everything seems okay.  But which shmem, if any, puts
+		 * back its signature byte when the card is reset?
+		 *
+		 * If there are multiple cards installed, there might be
+		 * multiple shmems still in the list.
+		 */
+#ifdef FAST_PROBE
+		if (numports > 1 || numshmems > 1) {
+			inb(_RESET);
+			mdelay(RESETtime);
+		} else {
+			/* just one shmem and port, assume they match */
+			isa_writeb(TESTvalue, shmems[0]);
+		}
+#else
+		inb(_RESET);
+		mdelay(RESETtime);
+#endif
+
+		for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
+			u_long ptr = *shmem;
+
+			if (isa_readb(ptr) == TESTvalue) {	/* found one */
+				BUGMSG2(D_INIT, "%lXh)\n", *shmem);
+				openparen = 0;
+
+				/* register the card */
+				retval = com90xx_found(dev, *port, airq, *shmem);
+				numprint = -1;
+
+				/* remove shmem from the list */
+				*shmem = shmems[numshmems - 1];
+				numshmems--;
+
+				break;	/* go to the next I/O port */
+			} else {
+				BUGMSG2(D_INIT_REASONS, "%Xh-", isa_readb(ptr));
+			}
+		}
+
+		if (openparen) {
+			BUGLVL(D_INIT) printk("no matching shmem)\n");
+			BUGLVL(D_INIT_REASONS) printk("S5: ");
+			BUGLVL(D_INIT_REASONS) numprint = 0;
+		}
+		*port = ports[numports - 1];
+		numports--;
+		port--;
+	}
+
+	BUGLVL(D_INIT_REASONS) printk("\n");
+
+	/* Now put back TESTvalue on all leftover shmems. */
+	for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++)
+		isa_writeb(TESTvalue, *shmem);
+
+	if (retval && dev && !numcards)
+		BUGMSG(D_NORMAL, "S5: No ARCnet cards found.\n");
+	return retval;
+}
+
+
+/* Set up the struct net_device associated with this card.  Called after
+ * probing succeeds.
+ */
+static int __init com90xx_found(struct net_device *dev0, int ioaddr, int airq,
+				u_long shmem)
+{
+	struct net_device *dev = dev0;
+	struct arcnet_local *lp;
+	u_long first_mirror, last_mirror;
+	int mirror_size, err;
+
+	/* allocate struct net_device if we don't have one yet */
+	if (!dev && !(dev = dev_alloc("arc%d", &err))) {
+		BUGMSG(D_NORMAL, "Can't allocate device!\n");
+		return err;
+	}
+	lp = dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
+	if (!lp) {
+		BUGMSG(D_NORMAL, "Can't allocate device data!\n");
+		goto err_free_dev;
+	}
+	/* 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 (isa_readb(shmem) == TESTvalue
+	    && isa_readb(shmem - mirror_size) != TESTvalue
+	    && isa_readb(shmem - 2 * mirror_size) == TESTvalue)
+		mirror_size *= 2;
+
+	first_mirror = last_mirror = shmem;
+	while (isa_readb(first_mirror) == TESTvalue)
+		first_mirror -= mirror_size;
+	first_mirror += mirror_size;
+
+	while (isa_readb(last_mirror) == TESTvalue)
+		last_mirror += mirror_size;
+	last_mirror -= mirror_size;
+
+	dev->mem_start = first_mirror;
+	dev->mem_end = last_mirror + MIRROR_SIZE - 1;
+	dev->rmem_start = dev->mem_start + BUFFER_SIZE * 0;
+	dev->rmem_end = dev->mem_start + BUFFER_SIZE * 2 - 1;
+
+	/* Initialize the rest of the device structure. */
+	memset(lp, 0, sizeof(struct arcnet_local));
+	lp->hw.command = com90xx_command;
+	lp->hw.status = com90xx_status;
+	lp->hw.intmask = com90xx_setmask;
+	lp->hw.reset = com90xx_reset;
+	lp->hw.open_close = com90xx_openclose;
+	lp->hw.copy_to_card = com90xx_copy_to_card;
+	lp->hw.copy_from_card = com90xx_copy_from_card;
+	lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+	if (!lp->mem_start) {
+		BUGMSG(D_NORMAL, "Can't remap device memory!\n");
+		goto err_free_dev_priv;
+	}
+	/* Fill in the fields of the device structure with generic values. */
+	arcdev_setup(dev);
+
+	/* get and check the station ID from offset 1 in shmem */
+	dev->dev_addr[0] = readb(lp->mem_start + 1);
+
+	/* reserve the irq */
+	if (request_irq(airq, &arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
+		BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", airq);
+		goto err_unmap;
+	}
+	dev->irq = airq;
+
+	/* reserve the I/O and memory regions - guaranteed to work by check_region */
+	request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (90xx)");
+	request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)");
+	dev->base_addr = ioaddr;
+
+	BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
+	       "ShMem %lXh (%ld*%xh).\n",
+	       dev->dev_addr[0],
+	       dev->base_addr, dev->irq, dev->mem_start,
+	 (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
+
+	if (!dev0 && register_netdev(dev))
+		goto err_release;
+
+	cards[numcards++] = dev;
+	return 0;
+
+      err_release:
+	free_irq(dev->irq, dev);
+	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
+	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+      err_unmap:
+	iounmap(lp->mem_start);
+      err_free_dev_priv:
+	kfree(dev->priv);
+      err_free_dev:
+	if (!dev0)
+		kfree(dev);
+	return -EIO;
+}
+
+
+static void com90xx_command(struct net_device *dev, int cmd)
+{
+	short ioaddr = dev->base_addr;
+
+	ACOMMAND(cmd);
+}
+
+
+static int com90xx_status(struct net_device *dev)
+{
+	short ioaddr = dev->base_addr;
+
+	return ASTATUS();
+}
+
+
+static void com90xx_setmask(struct net_device *dev, int mask)
+{
+	short ioaddr = dev->base_addr;
+
+	AINTMASK(mask);
+}
+
+
+/*
+ * 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.
+ */
+int com90xx_reset(struct net_device *dev, int really_reset)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	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);
+	}
+	ACOMMAND(CFLAGScmd | RESETclear);	/* clear flags & end reset */
+	ACOMMAND(CFLAGScmd | CONFIGclear);
+
+	/* don't do this until we verify that it doesn't hurt older cards! */
+	/* outb(inb(_CONFIG) | ENABLE16flag, _CONFIG); */
+
+	/* verify that the ARCnet signature byte is present */
+	if (readb(lp->mem_start) != TESTvalue) {
+		BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
+		return 1;
+	}
+	/* enable extended (512-byte) packets */
+	ACOMMAND(CONFIGcmd | EXTconf);
+
+	/* clean out all the memory to make debugging make more sense :) */
+	BUGLVL(D_DURING)
+	    memset_io(lp->mem_start, 0x42, 2048);
+
+	/* done!  return success. */
+	return 0;
+}
+
+
+static void com90xx_openclose(struct net_device *dev, bool open)
+{
+	if (open)
+		MOD_INC_USE_COUNT;
+	else
+		MOD_DEC_USE_COUNT;
+}
+
+
+static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *memaddr = lp->mem_start + bufnum * 512 + offset;
+	TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
+}
+
+
+static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *memaddr = lp->mem_start + bufnum * 512 + offset;
+	TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
+}
+
+
+
+#ifdef MODULE
+
+/* Module parameters */
+
+static int io = 0x0;		/* use the insmod io= irq= shmem= options */
+static int irq = 0;
+static int shmem = 0;
+static char *device;		/* use eg. device=arc1 to change name */
+
+MODULE_PARM(io, "i");
+MODULE_PARM(irq, "i");
+MODULE_PARM(shmem, "i");
+MODULE_PARM(device, "s");
+
+int init_module(void)
+{
+	struct net_device *dev;
+	int err;
+
+	if (io || irq || shmem || device) {
+		dev = dev_alloc(device ? : "arc%d", &err);
+		if (!dev)
+			return err;
+		dev->base_addr = io;
+		dev->irq = irq;
+		if (dev->irq == 2)
+			dev->irq = 9;
+		dev->mem_start = shmem;
+		com90xx_probe(dev);
+	} else
+		com90xx_probe(NULL);
+
+	if (!numcards)
+		return -EIO;
+	return 0;
+}
+
+
+void cleanup_module(void)
+{
+	struct net_device *dev;
+	struct arcnet_local *lp;
+	int count;
+
+	for (count = 0; count < numcards; count++) {
+		dev = cards[count];
+		lp = (struct arcnet_local *) dev->priv;
+
+		if (dev->start)
+			dev->stop(dev);
+		free_irq(dev->irq, dev);
+		iounmap(lp->mem_start);
+		release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
+		release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+		unregister_netdev(dev);
+		kfree(dev->priv);
+		kfree(dev);
+	}
+}
+
+#else
+
+static int __init com90xx_setup(char *s)
+{
+	struct net_device *dev;
+	int ints[8];
+
+	com90xx_skip_probe = 1;
+
+	s = get_options(s, 8, ints);
+	if (!ints[0] && !*s) {
+		printk("com90xx: Disabled.\n");
+		return 1;
+	}
+	dev = alloc_bootmem(sizeof(struct net_device) + 10);
+	memset(dev, 0, sizeof(struct net_device) + 10);
+	dev->name = (char *) (dev + 1);
+	dev->init = com90xx_probe;
+
+	switch (ints[0]) {
+	default:		/* ERROR */
+		printk("com90xx: Too many arguments.\n");
+	case 3:		/* Mem address */
+		dev->mem_start = ints[3];
+	case 2:		/* IRQ */
+		dev->irq = ints[2];
+	case 1:		/* IO address */
+		dev->base_addr = ints[1];
+	}
+	if (*s)
+		strncpy(dev->name, s, 9);
+	else
+		strcpy(dev->name, "arc%d");
+	if (register_netdev(dev))
+		printk(KERN_ERR "com90xx: Cannot register arcnet device\n");
+
+	return 1;
+}
+
+__setup("com90xx=", com90xx_setup);
+
+#endif				/* MODULE */