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  */
  50 static 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
 117 out:
 118         release_region(ioaddr, ARCNET_TOTAL_SIZE);
 119         return err;
 120 }
 121
 122 static int node = 0;
 123 static int io = 0x0;            /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
 124 static int irq = 0;             /* or use the insmod io= irq= shmem= options */
 125 static char device[9];          /* use eg. device="arc1" to change name */
 126 static int timeout = 3;
 127 static int backplane = 0;
 128 static int clockp = 0;
 129 static int clockm = 0;
 130
 131 module_param(node, int, 0);
 132 module_param_hw(io, int, ioport, 0);
 133 module_param_hw(irq, int, irq, 0);
 134 module_param_string(device, device, sizeof(device), 0);
 135 module_param(timeout, int, 0);
 136 module_param(backplane, int, 0);
 137 module_param(clockp, int, 0);
 138 module_param(clockm, int, 0);
 139
 140 MODULE_LICENSE("GPL");
 141
 142 static struct net_device *my_dev;
 143
 144 static 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_netdev(dev);
 173                 return -EIO;
 174         }
 175
 176         my_dev = dev;
 177         return 0;
 178 }
 179
 180 static 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_netdev(my_dev);
 186 }
 187
 188 #ifndef MODULE
 189 static 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
 228 module_init(com20020_init)
 229 module_exit(com20020_exit)