LXR linux/drivers/net/arcnet/com20020-isa.c

   1/*
   2 * Linux ARCnet driver - COM20020 chipset support
   3 *
   4 * Written 1997 by David Woodhouse.
   5 * Written 1994-1999 by Avery Pennarun.
   6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
   7 * Derived from skeleton.c by Donald Becker.
   8 *
   9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
  10 *  for sponsoring the further development of this driver.
  11 *
  12 * **********************
  13 *
  14 * The original copyright of skeleton.c was as follows:
  15 *
  16 * skeleton.c Written 1993 by Donald Becker.
  17 * Copyright 1993 United States Government as represented by the
  18 * Director, National Security Agency.  This software may only be used
  19 * and distributed according to the terms of the GNU General Public License as
  20 * modified by SRC, incorporated herein by reference.
  21 *
  22 * **********************
  23 *
  24 * For more details, see drivers/net/arcnet.c
  25 *
  26 * **********************
  27 */
  28
  29#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
  30
  31#include <linux/module.h>
  32#include <linux/moduleparam.h>
  33#include <linux/kernel.h>
  34#include <linux/types.h>
  35#include <linux/ioport.h>
  36#include <linux/errno.h>
  37#include <linux/delay.h>
  38#include <linux/netdevice.h>
  39#include <linux/init.h>
  40#include <linux/interrupt.h>
  41#include <linux/memblock.h>
  42#include <linux/io.h>
  43
  44#include "arcdevice.h"
  45#include "com20020.h"
  46
  47/* We cannot (yet) probe for an IO mapped card, although we can check that
  48 * it's where we were told it was, and even do autoirq.
  49 */
  50static int __init com20020isa_probe(struct net_device *dev)
  51{
  52        int ioaddr;
  53        unsigned long airqmask;
  54        struct arcnet_local *lp = netdev_priv(dev);
  55        int err;
  56
  57        if (BUGLVL(D_NORMAL))
  58                pr_info("%s\n", "COM20020 ISA support (by David Woodhouse et al.)");
  59
  60        ioaddr = dev->base_addr;
  61        if (!ioaddr) {
  62                arc_printk(D_NORMAL, dev, "No autoprobe (yet) for IO mapped cards; you must specify the base address!\n");
  63                return -ENODEV;
  64        }
  65        if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
  66                arc_printk(D_NORMAL, dev, "IO region %xh-%xh already allocated.\n",
  67                           ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
  68                return -ENXIO;
  69        }
  70        if (arcnet_inb(ioaddr, COM20020_REG_R_STATUS) == 0xFF) {
  71                arc_printk(D_NORMAL, dev, "IO address %x empty\n", ioaddr);
  72                err = -ENODEV;
  73                goto out;
  74        }
  75        if (com20020_check(dev)) {
  76                err = -ENODEV;
  77                goto out;
  78        }
  79
  80        if (!dev->irq) {
  81                /* if we do this, we're sure to get an IRQ since the
  82                 * card has just reset and the NORXflag is on until
  83                 * we tell it to start receiving.
  84                 */
  85                arc_printk(D_INIT_REASONS, dev, "intmask was %02Xh\n",
  86                           arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
  87                arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
  88                airqmask = probe_irq_on();
  89                arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
  90                udelay(1);
  91                arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
  92                dev->irq = probe_irq_off(airqmask);
  93
  94                if ((int)dev->irq <= 0) {
  95                        arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed first time\n");
  96                        airqmask = probe_irq_on();
  97                        arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
  98                        udelay(5);
  99                        arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
 100                        dev->irq = probe_irq_off(airqmask);
 101                        if ((int)dev->irq <= 0) {
 102                                arc_printk(D_NORMAL, dev, "Autoprobe IRQ failed.\n");
 103                                err = -ENODEV;
 104                                goto out;
 105                        }
 106                }
 107        }
 108
 109        lp->card_name = "ISA COM20020";
 110
 111        err = com20020_found(dev, 0);
 112        if (err != 0)
 113                goto out;
 114
 115        return 0;
 116
 117out:
 118        release_region(ioaddr, ARCNET_TOTAL_SIZE);
 119        return err;
 120}
 121
 122static int node = 0;
 123static int io = 0x0;            /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
 124static int irq = 0;             /* or use the insmod io= irq= shmem= options */
 125static char device[9];          /* use eg. device="arc1" to change name */
 126static int timeout = 3;
 127static int backplane = 0;
 128static int clockp = 0;
 129static int clockm = 0;
 130
 131module_param(node, int, 0);
 132module_param_hw(io, int, ioport, 0);
 133module_param_hw(irq, int, irq, 0);
 134module_param_string(device, device, sizeof(device), 0);
 135module_param(timeout, int, 0);
 136module_param(backplane, int, 0);
 137module_param(clockp, int, 0);
 138module_param(clockm, int, 0);
 139
 140MODULE_LICENSE("GPL");
 141
 142static struct net_device *my_dev;
 143
 144static int __init com20020_init(void)
 145{
 146        struct net_device *dev;
 147        struct arcnet_local *lp;
 148
 149        dev = alloc_arcdev(device);
 150        if (!dev)
 151                return -ENOMEM;
 152
 153        if (node && node != 0xff)
 154                dev->dev_addr[0] = node;
 155
 156        dev->netdev_ops = &com20020_netdev_ops;
 157
 158        lp = netdev_priv(dev);
 159        lp->backplane = backplane;
 160        lp->clockp = clockp & 7;
 161        lp->clockm = clockm & 3;
 162        lp->timeout = timeout & 3;
 163        lp->hw.owner = THIS_MODULE;
 164
 165        dev->base_addr = io;
 166        dev->irq = irq;
 167
 168        if (dev->irq == 2)
 169                dev->irq = 9;
 170
 171        if (com20020isa_probe(dev)) {
 172                free_arcdev(dev);
 173                return -EIO;
 174        }
 175
 176        my_dev = dev;
 177        return 0;
 178}
 179
 180static void __exit com20020_exit(void)
 181{
 182        unregister_netdev(my_dev);
 183        free_irq(my_dev->irq, my_dev);
 184        release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
 185        free_arcdev(my_dev);
 186}
 187
 188#ifndef MODULE
 189static int __init com20020isa_setup(char *s)
 190{
 191        int ints[8];
 192
 193        s = get_options(s, 8, ints);
 194        if (!ints[0])
 195                return 1;
 196
 197        switch (ints[0]) {
 198        default:                /* ERROR */
 199                pr_info("Too many arguments\n");
 200                fallthrough;
 201        case 6:         /* Timeout */
 202                timeout = ints[6];
 203                fallthrough;
 204        case 5:         /* CKP value */
 205                clockp = ints[5];
 206                fallthrough;
 207        case 4:         /* Backplane flag */
 208                backplane = ints[4];
 209                fallthrough;
 210        case 3:         /* Node ID */
 211                node = ints[3];
 212                fallthrough;
 213        case 2:         /* IRQ */
 214                irq = ints[2];
 215                fallthrough;
 216        case 1:         /* IO address */
 217                io = ints[1];
 218        }
 219        if (*s)
 220                snprintf(device, sizeof(device), "%s", s);
 221        return 1;
 222}
 223
 224__setup("com20020=", com20020isa_setup);
 225
 226#endif                          /* MODULE */
 227
 228module_init(com20020_init)
 229module_exit(com20020_exit)
 230