/*
   * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
   * 
   * Written 1994-1999 by Avery Pennarun.
   * Written 1999 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/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/interrupt.h>
  #include <linux/ioport.h>
  #include <linux/delay.h>
  #include <linux/netdevice.h>
  #include <linux/slab.h>
  #include <asm/io.h>
  #include <linux/arcdevice.h>
  
  
  #define VERSION "arcnet: COM90xx chipset support
  "
  
  
  /* 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(int ioaddr, int airq, u_long shmem, void __iomem *);
  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_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;
  
  /* Module parameters */
  
  static int io;			/* use the insmod io= irq= shmem= options */
  static int irq;
  static int shmem;
  static char device[9];		/* use eg. device=arc1 to change name */
  
  module_param(io, int, 0);
  module_param(irq, int, 0);
  module_param(shmem, int, 0);
  module_param_string(device, device, sizeof(device), 0);
  
  static void __init com90xx_probe(void)
  {
  	int count, status, ioaddr, numprint, airq, openparen = 0;
  	unsigned long airqmask;
  	int ports[(0x3f0 - 0x200) / 16 + 1] =
  	{0};
  	unsigned long *shmems;
  	void __iomem **iomem;
  	int numports, numshmems, *port;
  	u_long *p;
  	int index;
  
  	if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
  		return;
  
  	shmems = kzalloc(((0x100000-0xa0000) / 0x800) * sizeof(unsigned long),
  			 GFP_KERNEL);
  	if (!shmems)
  		return;
  	iomem = kzalloc(((0x100000-0xa0000) / 0x800) * sizeof(void __iomem *),
  			 GFP_KERNEL);
  	if (!iomem) {
  		kfree(shmems);
  		return;
  	}
  
  	BUGLVL(D_NORMAL) printk(VERSION);
  
  	/* set up the arrays where we'll store the possible probe addresses */
  	numports = numshmems = 0;
  	if (io)
  		ports[numports++] = io;
  	else
  		for (count = 0x200; count <= 0x3f0; count += 16)
  			ports[numports++] = count;
  	if (shmem)
  		shmems[numshmems++] = shmem;
  	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, "
  ");
  			BUGMSG2(D_INIT, "S1: ");
  		}
  		BUGMSG2(D_INIT, "%Xh ", *port);
  
  		ioaddr = *port;
  
  		if (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
  			BUGMSG2(D_INIT_REASONS, "(request_region)
  ");
  			BUGMSG2(D_INIT_REASONS, "S1: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			*port-- = ports[--numports];
  			continue;
  		}
  		if (ASTATUS() == 0xFF) {
  			BUGMSG2(D_INIT_REASONS, "(empty)
  ");
  			BUGMSG2(D_INIT_REASONS, "S1: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			release_region(*port, ARCNET_TOTAL_SIZE);
  			*port-- = ports[--numports];
  			continue;
  		}
  		inb(_RESET);	/* begin resetting card */
  
  		BUGMSG2(D_INIT_REASONS, "
  ");
  		BUGMSG2(D_INIT_REASONS, "S1: ");
  		BUGLVL(D_INIT_REASONS) numprint = 0;
  	}
  	BUGMSG2(D_INIT, "
  ");
  
  	if (!numports) {
  		BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.
  ");
  		kfree(shmems);
  		kfree(iomem);
  		return;
  	}
  	/* 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, "
  ");
  			BUGMSG2(D_INIT, "S2: ");
  		}
  		BUGMSG2(D_INIT, "%Xh ", *port);
  	}
  	BUGMSG2(D_INIT, "
  ");
  	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 (index = 0, p = &shmems[0]; index < numshmems; p++, index++) {
  		void __iomem *base;
  
  		numprint++;
  		numprint %= 8;
  		if (!numprint) {
  			BUGMSG2(D_INIT, "
  ");
  			BUGMSG2(D_INIT, "S3: ");
  		}
  		BUGMSG2(D_INIT, "%lXh ", *p);
  
  		if (!request_mem_region(*p, MIRROR_SIZE, "arcnet (90xx)")) {
  			BUGMSG2(D_INIT_REASONS, "(request_mem_region)
  ");
  			BUGMSG2(D_INIT_REASONS, "Stage 3: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			goto out;
  		}
  		base = ioremap(*p, MIRROR_SIZE);
  		if (!base) {
  			BUGMSG2(D_INIT_REASONS, "(ioremap)
  ");
  			BUGMSG2(D_INIT_REASONS, "Stage 3: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			goto out1;
  		}
  		if (readb(base) != TESTvalue) {
  			BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)
  ",
  				readb(base), TESTvalue);
  			BUGMSG2(D_INIT_REASONS, "S3: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			goto out2;
  		}
  		/* 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.
  		 */
  		writeb(0x42, base);
  		if (readb(base) != 0x42) {
  			BUGMSG2(D_INIT_REASONS, "(read only)
  ");
  			BUGMSG2(D_INIT_REASONS, "S3: ");
  			goto out2;
  		}
  		BUGMSG2(D_INIT_REASONS, "
  ");
  		BUGMSG2(D_INIT_REASONS, "S3: ");
  		BUGLVL(D_INIT_REASONS) numprint = 0;
  		iomem[index] = base;
  		continue;
  	out2:
  		iounmap(base);
  	out1:
  		release_mem_region(*p, MIRROR_SIZE);
  	out:
  		*p-- = shmems[--numshmems];
  		index--;
  	}
  	BUGMSG2(D_INIT, "
  ");
  
  	if (!numshmems) {
  		BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.
  ");
  		for (port = &ports[0]; port < ports + numports; port++)
  			release_region(*port, ARCNET_TOTAL_SIZE);
  		kfree(shmems);
  		kfree(iomem);
  		return;
  	}
  	/* Stage 4: something of a dummy, to report the shmems that are
  	 * still possible after stage 3.
  	 */
  	numprint = -1;
  	for (p = &shmems[0]; p < shmems + numshmems; p++) {
  		numprint++;
  		numprint %= 8;
  		if (!numprint) {
  			BUGMSG2(D_INIT, "
  ");
  			BUGMSG2(D_INIT, "S4: ");
  		}
  		BUGMSG2(D_INIT, "%lXh ", *p);
  	}
  	BUGMSG2(D_INIT, "
  ");
  
  	/* 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++) {
  		int found = 0;
  		numprint++;
  		numprint %= 8;
  		if (!numprint) {
  			BUGMSG2(D_INIT, "
  ");
  			BUGMSG2(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)
  ", status);
  			BUGMSG2(D_INIT_REASONS, "S5: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			release_region(*port, ARCNET_TOTAL_SIZE);
  			*port-- = ports[--numports];
  			continue;
  		}
  		ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
  		status = ASTATUS();
  		if (status & RESETflag) {
  			BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)
  ",
  				status);
  			BUGMSG2(D_INIT_REASONS, "S5: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  			release_region(*port, ARCNET_TOTAL_SIZE);
  			*port-- = ports[--numports];
  			continue;
  		}
  		/* skip this completely if an IRQ was given, because maybe
  		 * we're on a machine that locks during autoirq!
  		 */
  		if (!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)
  ", airq);
  				BUGMSG2(D_INIT_REASONS, "S5: ");
  				BUGLVL(D_INIT_REASONS) numprint = 0;
  				release_region(*port, ARCNET_TOTAL_SIZE);
  				*port-- = ports[--numports];
  				continue;
  			}
  		} else {
  			airq = 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 */
  			writeb(TESTvalue, iomem[0]);
  		}
  #else
  		inb(_RESET);
  		mdelay(RESETtime);
  #endif
  
  		for (index = 0; index < numshmems; index++) {
  			u_long ptr = shmems[index];
  			void __iomem *base = iomem[index];
  
  			if (readb(base) == TESTvalue) {	/* found one */
  				BUGMSG2(D_INIT, "%lXh)
  ", *p);
  				openparen = 0;
  
  				/* register the card */
  				if (com90xx_found(*port, airq, ptr, base) == 0)
  					found = 1;
  				numprint = -1;
  
  				/* remove shmem from the list */
  				shmems[index] = shmems[--numshmems];
  				iomem[index] = iomem[numshmems];
  				break;	/* go to the next I/O port */
  			} else {
  				BUGMSG2(D_INIT_REASONS, "%Xh-", readb(base));
  			}
  		}
  
  		if (openparen) {
  			BUGLVL(D_INIT) printk("no matching shmem)
  ");
  			BUGLVL(D_INIT_REASONS) printk("S5: ");
  			BUGLVL(D_INIT_REASONS) numprint = 0;
  		}
  		if (!found)
  			release_region(*port, ARCNET_TOTAL_SIZE);
  		*port-- = ports[--numports];
  	}
  
  	BUGLVL(D_INIT_REASONS) printk("
  ");
  
  	/* Now put back TESTvalue on all leftover shmems. */
  	for (index = 0; index < numshmems; index++) {
  		writeb(TESTvalue, iomem[index]);
  		iounmap(iomem[index]);
  		release_mem_region(shmems[index], MIRROR_SIZE);
  	}
  	kfree(shmems);
  	kfree(iomem);
  }
  
  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 (readb(p) == 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 com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *p)
  {
  	struct net_device *dev = NULL;
  	struct arcnet_local *lp;
  	u_long first_mirror, last_mirror;
  	int mirror_size;
  
  	/* allocate struct net_device */
  	dev = alloc_arcdev(device);
  	if (!dev) {
  		BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!
  ");
  		iounmap(p);
  		release_mem_region(shmem, MIRROR_SIZE);
  		return -ENOMEM;
  	}
  	lp = netdev_priv(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 (readb(p) == 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;
  
  	iounmap(p);
  	release_mem_region(shmem, MIRROR_SIZE);
  
  	if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
  		goto err_free_dev;
  
  	/* reserve the irq */
  	if (request_irq(airq, arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
  		BUGMSG(D_NORMAL, "Can't get IRQ %d!
  ", airq);
  		goto err_release_mem;
  	}
  	dev->irq = airq;
  
  	/* Initialize the rest of the device structure. */
  	lp->card_name = "COM90xx";
  	lp->hw.command = com90xx_command;
  	lp->hw.status = com90xx_status;
  	lp->hw.intmask = com90xx_setmask;
  	lp->hw.reset = com90xx_reset;
  	lp->hw.owner = THIS_MODULE;
  	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!
  ");
  		goto err_free_irq;
  	}
  
  	/* get and check the station ID from offset 1 in shmem */
  	dev->dev_addr[0] = readb(lp->mem_start + 1);
  
  	dev->base_addr = ioaddr;
  
  	BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
  	       "ShMem %lXh (%ld*%xh).
  ",
  	       dev->dev_addr[0],
  	       dev->base_addr, dev->irq, dev->mem_start,
  	 (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
  
  	if (register_netdev(dev))
  		goto err_unmap;
  
  	cards[numcards++] = dev;
  	return 0;
  
  err_unmap:
  	iounmap(lp->mem_start);
  err_free_irq:
  	free_irq(dev->irq, dev);
  err_release_mem:
  	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
  err_free_dev:
  	free_netdev(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.
   */
  static int com90xx_reset(struct net_device *dev, int really_reset)
  {
  	struct arcnet_local *lp = netdev_priv(dev);
  	short ioaddr = dev->base_addr;
  
  	BUGMSG(D_INIT, "Resetting (status=%02Xh)
  ", 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) {
  		if (really_reset)
  			BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.
  ");
  		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_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 + 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 = netdev_priv(dev);
  	void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
  	TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
  }
  
  
  MODULE_LICENSE("GPL");
  
  static int __init com90xx_init(void)
  {
  	if (irq == 2)
  		irq = 9;
  	com90xx_probe();
  	if (!numcards)
  		return -EIO;
  	return 0;
  }
  
  static void __exit com90xx_exit(void)
  {
  	struct net_device *dev;
  	struct arcnet_local *lp;
  	int count;
  
  	for (count = 0; count < numcards; count++) {
  		dev = cards[count];
  		lp = netdev_priv(dev);
  
  		unregister_netdev(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);
  		free_netdev(dev);
  	}
  }
  
  module_init(com90xx_init);
  module_exit(com90xx_exit);
  
  #ifndef MODULE
  static int __init com90xx_setup(char *s)
  {
  	int ints[8];
  
  	s = get_options(s, 8, ints);
  	if (!ints[0] && !*s) {
  		printk("com90xx: Disabled.
  ");
  		return 1;
  	}
  
  	switch (ints[0]) {
  	default:		/* ERROR */
  		printk("com90xx: Too many arguments.
  ");
  	case 3:		/* Mem address */
  		shmem = ints[3];
  	case 2:		/* IRQ */
  		irq = ints[2];
  	case 1:		/* IO address */
  		io = ints[1];
  	}
  
  	if (*s)
  		snprintf(device, sizeof(device), "%s", s);
  
  	return 1;
  }
  
  __setup("com90xx=", com90xx_setup);
  #endif