/*
   * Linux ARCnet driver - COM20020 chipset support
   *
   * 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/module.h>
  #include <linux/moduleparam.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/ioport.h>
  #include <linux/errno.h>
  #include <linux/delay.h>
  #include <linux/netdevice.h>
  #include <linux/init.h>
  #include <linux/interrupt.h>
  #include <linux/bootmem.h>
  #include <linux/io.h>
  
  #include "arcdevice.h"
  #include "com20020.h"
  
  /* We cannot (yet) probe for an IO mapped card, although we can check that
   * it's where we were told it was, and even do autoirq.
   */
  static int __init com20020isa_probe(struct net_device *dev)
  {
  	int ioaddr;
  	unsigned long airqmask;
  	struct arcnet_local *lp = netdev_priv(dev);
  	int err;
  
  	if (BUGLVL(D_NORMAL))
  		pr_info("%s
  ", "COM20020 ISA support (by David Woodhouse et al.)");
  
  	ioaddr = dev->base_addr;
  	if (!ioaddr) {
  		arc_printk(D_NORMAL, dev, "No autoprobe (yet) for IO mapped cards; you must specify the base address!
  ");
  		return -ENODEV;
  	}
  	if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
  		arc_printk(D_NORMAL, dev, "IO region %xh-%xh already allocated.
  ",
  			   ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
  		return -ENXIO;
  	}
  	if (arcnet_inb(ioaddr, COM20020_REG_R_STATUS) == 0xFF) {
  		arc_printk(D_NORMAL, dev, "IO address %x empty
  ", ioaddr);
  		err = -ENODEV;
  		goto out;
  	}
  	if (com20020_check(dev)) {
  		err = -ENODEV;
  		goto 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.
  		 */
  		arc_printk(D_INIT_REASONS, dev, "intmask was %02Xh
  ",
  			   arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
  		arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
  		airqmask = probe_irq_on();
  		arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
  		udelay(1);
  		arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
  		dev->irq = probe_irq_off(airqmask);
  
  		if ((int)dev->irq <= 0) {
  			arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed first time
  ");
  			airqmask = probe_irq_on();
  			arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
  			udelay(5);
  			arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
  			dev->irq = probe_irq_off(airqmask);
  			if ((int)dev->irq <= 0) {
  				arc_printk(D_NORMAL, dev, "Autoprobe IRQ failed.
  ");
  				err = -ENODEV;
  				goto out;
  			}
  		}
  	}
  
  	lp->card_name = "ISA COM20020";
  
  	err = com20020_found(dev, 0);
  	if (err != 0)
  		goto out;
  
  	return 0;
  
  out:
  	release_region(ioaddr, ARCNET_TOTAL_SIZE);
  	return err;
  }
  
  static int node = 0;
  static int io = 0x0;		/* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
  static int irq = 0;		/* or use the insmod io= irq= shmem= options */
  static char device[9];		/* use eg. device="arc1" to change name */
  static int timeout = 3;
  static int backplane = 0;
  static int clockp = 0;
  static int clockm = 0;
  
  module_param(node, int, 0);
  module_param(io, int, 0);
  module_param(irq, int, 0);
  module_param_string(device, device, sizeof(device), 0);
  module_param(timeout, int, 0);
  module_param(backplane, int, 0);
  module_param(clockp, int, 0);
  module_param(clockm, int, 0);
  
  MODULE_LICENSE("GPL");
  
  static struct net_device *my_dev;
  
  static int __init com20020_init(void)
  {
  	struct net_device *dev;
  	struct arcnet_local *lp;
  
  	dev = alloc_arcdev(device);
  	if (!dev)
  		return -ENOMEM;
  
  	if (node && node != 0xff)
  		dev->dev_addr[0] = node;
  
  	dev->netdev_ops = &com20020_netdev_ops;
  
  	lp = netdev_priv(dev);
  	lp->backplane = backplane;
  	lp->clockp = clockp & 7;
  	lp->clockm = clockm & 3;
  	lp->timeout = timeout & 3;
  	lp->hw.owner = THIS_MODULE;
  
  	dev->base_addr = io;
  	dev->irq = irq;
  
  	if (dev->irq == 2)
  		dev->irq = 9;
  
  	if (com20020isa_probe(dev)) {
  		free_netdev(dev);
  		return -EIO;
  	}
  
  	my_dev = dev;
  	return 0;
  }
  
  static void __exit com20020_exit(void)
  {
  	unregister_netdev(my_dev);
  	free_irq(my_dev->irq, my_dev);
  	release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
  	free_netdev(my_dev);
  }
  
  #ifndef MODULE
  static int __init com20020isa_setup(char *s)
  {
  	int ints[8];
  
  	s = get_options(s, 8, ints);
  	if (!ints[0])
  		return 1;
  
  	switch (ints[0]) {
  	default:		/* ERROR */
  		pr_info("Too many arguments
  ");
  	case 6:		/* Timeout */
  		timeout = ints[6];
  	case 5:		/* CKP value */
  		clockp = ints[5];
  	case 4:		/* Backplane flag */
  		backplane = ints[4];
  	case 3:		/* Node ID */
  		node = 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("com20020=", com20020isa_setup);
  
  #endif				/* MODULE */
  
  module_init(com20020_init)
  module_exit(com20020_exit)