com20020-isa.c

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/*
 * Linux ARCnet driver - COM20020 chipset support
 * 
 * Written 1997 by David Woodhouse.
 * Written 1994-1999 by Avery Pennarun.
 * Written 1999-2000 by Martin Mares <[email protected]>.
 * 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/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/arcdevice.h>
#include <linux/com20020.h>

#include <asm/io.h>

#define VERSION "arcnet: COM20020 ISA support (by David Woodhouse et al.)\n"


/*
 * 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;

    BUGLVL(D_NORMAL) printk(VERSION);

    ioaddr = dev->base_addr;
    if (!ioaddr) {
        BUGMSG(D_NORMAL, "No autoprobe (yet) for IO mapped cards; you "
               "must specify the base address!\n");
        return -ENODEV;
    }
    if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
        BUGMSG(D_NORMAL, "IO region %xh-%xh already allocated.\n",
               ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
        return -ENXIO;
    }
    if (ASTATUS() == 0xFF) {
        BUGMSG(D_NORMAL, "IO address %x empty\n", 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.
         */
        BUGMSG(D_INIT_REASONS, "intmask was %02Xh\n", inb(_INTMASK));
        outb(0, _INTMASK);
        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 first time\n");
            airqmask = probe_irq_on();
            outb(NORXflag, _INTMASK);
            udelay(5);
            outb(0, _INTMASK);
            dev->irq = probe_irq_off(airqmask);
            if ((int)dev->irq <= 0) {
                BUGMSG(D_NORMAL, "Autoprobe IRQ failed.\n");
                err = -ENODEV;
                goto out;
            }
        }
    }

    lp->card_name = "ISA COM20020";
    if ((err = com20020_found(dev, 0)) != 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 */
        printk("com90xx: Too many arguments.\n");
    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)