net/arcnet/com20020-isa.c

0001 /*
0002  * Linux ARCnet driver - COM20020 chipset support
0003  *
0004  * Written 1997 by David Woodhouse.
0005  * Written 1994-1999 by Avery Pennarun.
0006  * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
0007  * Derived from skeleton.c by Donald Becker.
0008  *
0009  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
0010  *  for sponsoring the further development of this driver.
0011  *
0012  * **********************
0013  *
0014  * The original copyright of skeleton.c was as follows:
0015  *
0016  * skeleton.c Written 1993 by Donald Becker.
0017  * Copyright 1993 United States Government as represented by the
0018  * Director, National Security Agency.  This software may only be used
0019  * and distributed according to the terms of the GNU General Public License as
0020  * modified by SRC, incorporated herein by reference.
0021  *
0022  * **********************
0023  *
0024  * For more details, see drivers/net/arcnet.c
0025  *
0026  * **********************
0027  */
0028
0029 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
0030
0031 #include <linux/module.h>
0032 #include <linux/moduleparam.h>
0033 #include <linux/kernel.h>
0034 #include <linux/types.h>
0035 #include <linux/ioport.h>
0036 #include <linux/errno.h>
0037 #include <linux/delay.h>
0038 #include <linux/netdevice.h>
0039 #include <linux/init.h>
0040 #include <linux/interrupt.h>
0041 #include <linux/memblock.h>
0042 #include <linux/io.h>
0043
0044 #include "arcdevice.h"
0045 #include "com20020.h"
0046
0047 /* We cannot (yet) probe for an IO mapped card, although we can check that
0048  * it's where we were told it was, and even do autoirq.
0049  */
0050 static int __init com20020isa_probe(struct net_device *dev)
0051 {
0052     int ioaddr;
0053     unsigned long airqmask;
0054     struct arcnet_local *lp = netdev_priv(dev);
0055     int err;
0056
0057     if (BUGLVL(D_NORMAL))
0058         pr_info("%s\n", "COM20020 ISA support (by David Woodhouse et al.)");
0059
0060     ioaddr = dev->base_addr;
0061     if (!ioaddr) {
0062         arc_printk(D_NORMAL, dev, "No autoprobe (yet) for IO mapped cards; you must specify the base address!\n");
0063         return -ENODEV;
0064     }
0065     if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
0066         arc_printk(D_NORMAL, dev, "IO region %xh-%xh already allocated.\n",
0067                ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
0068         return -ENXIO;
0069     }
0070     if (arcnet_inb(ioaddr, COM20020_REG_R_STATUS) == 0xFF) {
0071         arc_printk(D_NORMAL, dev, "IO address %x empty\n", ioaddr);
0072         err = -ENODEV;
0073         goto out;
0074     }
0075     if (com20020_check(dev)) {
0076         err = -ENODEV;
0077         goto out;
0078     }
0079
0080     if (!dev->irq) {
0081         /* if we do this, we're sure to get an IRQ since the
0082          * card has just reset and the NORXflag is on until
0083          * we tell it to start receiving.
0084          */
0085         arc_printk(D_INIT_REASONS, dev, "intmask was %02Xh\n",
0086                arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
0087         arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
0088         airqmask = probe_irq_on();
0089         arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
0090         udelay(1);
0091         arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
0092         dev->irq = probe_irq_off(airqmask);
0093
0094         if ((int)dev->irq <= 0) {
0095             arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed first time\n");
0096             airqmask = probe_irq_on();
0097             arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
0098             udelay(5);
0099             arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
0100             dev->irq = probe_irq_off(airqmask);
0101             if ((int)dev->irq <= 0) {
0102                 arc_printk(D_NORMAL, dev, "Autoprobe IRQ failed.\n");
0103                 err = -ENODEV;
0104                 goto out;
0105             }
0106         }
0107     }
0108
0109     lp->card_name = "ISA COM20020";
0110
0111     err = com20020_found(dev, 0);
0112     if (err != 0)
0113         goto out;
0114
0115     return 0;
0116
0117 out:
0118     release_region(ioaddr, ARCNET_TOTAL_SIZE);
0119     return err;
0120 }
0121
0122 static int node = 0;
0123 static int io = 0x0;        /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
0124 static int irq = 0;     /* or use the insmod io= irq= shmem= options */
0125 static char device[9];      /* use eg. device="arc1" to change name */
0126 static int timeout = 3;
0127 static int backplane = 0;
0128 static int clockp = 0;
0129 static int clockm = 0;
0130
0131 module_param(node, int, 0);
0132 module_param_hw(io, int, ioport, 0);
0133 module_param_hw(irq, int, irq, 0);
0134 module_param_string(device, device, sizeof(device), 0);
0135 module_param(timeout, int, 0);
0136 module_param(backplane, int, 0);
0137 module_param(clockp, int, 0);
0138 module_param(clockm, int, 0);
0139
0140 MODULE_LICENSE("GPL");
0141
0142 static struct net_device *my_dev;
0143
0144 static int __init com20020_init(void)
0145 {
0146     struct net_device *dev;
0147     struct arcnet_local *lp;
0148
0149     dev = alloc_arcdev(device);
0150     if (!dev)
0151         return -ENOMEM;
0152
0153     if (node && node != 0xff)
0154         arcnet_set_addr(dev, node);
0155
0156     dev->netdev_ops = &com20020_netdev_ops;
0157
0158     lp = netdev_priv(dev);
0159     lp->backplane = backplane;
0160     lp->clockp = clockp & 7;
0161     lp->clockm = clockm & 3;
0162     lp->timeout = timeout & 3;
0163     lp->hw.owner = THIS_MODULE;
0164
0165     dev->base_addr = io;
0166     dev->irq = irq;
0167
0168     if (dev->irq == 2)
0169         dev->irq = 9;
0170
0171     if (com20020isa_probe(dev)) {
0172         free_arcdev(dev);
0173         return -EIO;
0174     }
0175
0176     my_dev = dev;
0177     return 0;
0178 }
0179
0180 static void __exit com20020_exit(void)
0181 {
0182     unregister_netdev(my_dev);
0183     free_irq(my_dev->irq, my_dev);
0184     release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
0185     free_arcdev(my_dev);
0186 }
0187
0188 #ifndef MODULE
0189 static int __init com20020isa_setup(char *s)
0190 {
0191     int ints[8];
0192
0193     s = get_options(s, 8, ints);
0194     if (!ints[0])
0195         return 1;
0196
0197     switch (ints[0]) {
0198     default:        /* ERROR */
0199         pr_info("Too many arguments\n");
0200         fallthrough;
0201     case 6:     /* Timeout */
0202         timeout = ints[6];
0203         fallthrough;
0204     case 5:     /* CKP value */
0205         clockp = ints[5];
0206         fallthrough;
0207     case 4:     /* Backplane flag */
0208         backplane = ints[4];
0209         fallthrough;
0210     case 3:     /* Node ID */
0211         node = ints[3];
0212         fallthrough;
0213     case 2:     /* IRQ */
0214         irq = ints[2];
0215         fallthrough;
0216     case 1:     /* IO address */
0217         io = ints[1];
0218     }
0219     if (*s)
0220         snprintf(device, sizeof(device), "%s", s);
0221     return 1;
0222 }
0223
0224 __setup("com20020=", com20020isa_setup);
0225
0226 #endif              /* MODULE */
0227
0228 module_init(com20020_init)
0229 module_exit(com20020_exit)