drivers/net/can/sja1000/sja1000_isa.c

   1 /*
   2  * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the version 2 of the GNU General Public License
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/isa.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/delay.h>
  24 #include <linux/irq.h>
  25 #include <linux/io.h>
  26 #include <linux/can/dev.h>
  27 #include <linux/can/platform/sja1000.h>
  28
  29 #include "sja1000.h"
  30
  31 #define DRV_NAME "sja1000_isa"
  32
  33 #define MAXDEV 8
  34
  35 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
  36 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
  37 MODULE_LICENSE("GPL v2");
  38
  39 #define CLK_DEFAULT     16000000        /* 16 MHz */
  40 #define CDR_DEFAULT     (CDR_CBP | CDR_CLK_OFF)
  41 #define OCR_DEFAULT     OCR_TX0_PUSHPULL
  42
  43 static unsigned long port[MAXDEV];
  44 static unsigned long mem[MAXDEV];
  45 static int __devinitdata irq[MAXDEV];
  46 static int __devinitdata clk[MAXDEV];
  47 static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  48 static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  49 static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  50
  51 module_param_array(port, ulong, NULL, S_IRUGO);
  52 MODULE_PARM_DESC(port, "I/O port number");
  53
  54 module_param_array(mem, ulong, NULL, S_IRUGO);
  55 MODULE_PARM_DESC(mem, "I/O memory address");
  56
  57 module_param_array(indirect, byte, NULL, S_IRUGO);
  58 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
  59
  60 module_param_array(irq, int, NULL, S_IRUGO);
  61 MODULE_PARM_DESC(irq, "IRQ number");
  62
  63 module_param_array(clk, int, NULL, S_IRUGO);
  64 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
  65                  "(default=16000000 [16 MHz])");
  66
  67 module_param_array(cdr, byte, NULL, S_IRUGO);
  68 MODULE_PARM_DESC(cdr, "Clock divider register "
  69                  "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
  70
  71 module_param_array(ocr, byte, NULL, S_IRUGO);
  72 MODULE_PARM_DESC(ocr, "Output control register "
  73                  "(default=0x18 [OCR_TX0_PUSHPULL])");
  74
  75 #define SJA1000_IOSIZE          0x20
  76 #define SJA1000_IOSIZE_INDIRECT 0x02
  77
  78 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
  79 {
  80         return readb(priv->reg_base + reg);
  81 }
  82
  83 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
  84                                       int reg, u8 val)
  85 {
  86         writeb(val, priv->reg_base + reg);
  87 }
  88
  89 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
  90 {
  91         return inb((unsigned long)priv->reg_base + reg);
  92 }
  93
  94 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
  95                                        int reg, u8 val)
  96 {
  97         outb(val, (unsigned long)priv->reg_base + reg);
  98 }
  99
 100 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
 101                                              int reg)
 102 {
 103         unsigned long base = (unsigned long)priv->reg_base;
 104
 105         outb(reg, base);
 106         return inb(base + 1);
 107 }
 108
 109 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
 110                                                 int reg, u8 val)
 111 {
 112         unsigned long base = (unsigned long)priv->reg_base;
 113
 114         outb(reg, base);
 115         outb(val, base + 1);
 116 }
 117
 118 static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
 119 {
 120         if (port[idx] || mem[idx]) {
 121                 if (irq[idx])
 122                         return 1;
 123         } else if (idx)
 124                 return 0;
 125
 126         dev_err(pdev, "insufficient parameters supplied\n");
 127         return 0;
 128 }
 129
 130 static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
 131 {
 132         struct net_device *dev;
 133         struct sja1000_priv *priv;
 134         void __iomem *base = NULL;
 135         int iosize = SJA1000_IOSIZE;
 136         int err;
 137
 138         if (mem[idx]) {
 139                 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
 140                         err = -EBUSY;
 141                         goto exit;
 142                 }
 143                 base = ioremap_nocache(mem[idx], iosize);
 144                 if (!base) {
 145                         err = -ENOMEM;
 146                         goto exit_release;
 147                 }
 148         } else {
 149                 if (indirect[idx] > 0 ||
 150                     (indirect[idx] == -1 && indirect[0] > 0))
 151                         iosize = SJA1000_IOSIZE_INDIRECT;
 152                 if (!request_region(port[idx], iosize, DRV_NAME)) {
 153                         err = -EBUSY;
 154                         goto exit;
 155                 }
 156         }
 157
 158         dev = alloc_sja1000dev(0);
 159         if (!dev) {
 160                 err = -ENOMEM;
 161                 goto exit_unmap;
 162         }
 163         priv = netdev_priv(dev);
 164
 165         dev->irq = irq[idx];
 166         priv->irq_flags = IRQF_SHARED;
 167         if (mem[idx]) {
 168                 priv->reg_base = base;
 169                 dev->base_addr = mem[idx];
 170                 priv->read_reg = sja1000_isa_mem_read_reg;
 171                 priv->write_reg = sja1000_isa_mem_write_reg;
 172         } else {
 173                 priv->reg_base = (void __iomem *)port[idx];
 174                 dev->base_addr = port[idx];
 175
 176                 if (iosize == SJA1000_IOSIZE_INDIRECT) {
 177                         priv->read_reg = sja1000_isa_port_read_reg_indirect;
 178                         priv->write_reg = sja1000_isa_port_write_reg_indirect;
 179                 } else {
 180                         priv->read_reg = sja1000_isa_port_read_reg;
 181                         priv->write_reg = sja1000_isa_port_write_reg;
 182                 }
 183         }
 184
 185         if (clk[idx])
 186                 priv->can.clock.freq = clk[idx] / 2;
 187         else if (clk[0])
 188                 priv->can.clock.freq = clk[0] / 2;
 189         else
 190                 priv->can.clock.freq = CLK_DEFAULT / 2;
 191
 192         if (ocr[idx] != -1)
 193                 priv->ocr = ocr[idx] & 0xff;
 194         else if (ocr[0] != -1)
 195                 priv->ocr = ocr[0] & 0xff;
 196         else
 197                 priv->ocr = OCR_DEFAULT;
 198
 199         if (cdr[idx] != -1)
 200                 priv->cdr = cdr[idx] & 0xff;
 201         else if (cdr[0] != -1)
 202                 priv->cdr = cdr[0] & 0xff;
 203         else
 204                 priv->cdr = CDR_DEFAULT;
 205
 206         dev_set_drvdata(pdev, dev);
 207         SET_NETDEV_DEV(dev, pdev);
 208
 209         err = register_sja1000dev(dev);
 210         if (err) {
 211                 dev_err(pdev, "registering %s failed (err=%d)\n",
 212                         DRV_NAME, err);
 213                 goto exit_unmap;
 214         }
 215
 216         dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
 217                  DRV_NAME, priv->reg_base, dev->irq);
 218         return 0;
 219
 220  exit_unmap:
 221         if (mem[idx])
 222                 iounmap(base);
 223  exit_release:
 224         if (mem[idx])
 225                 release_mem_region(mem[idx], iosize);
 226         else
 227                 release_region(port[idx], iosize);
 228  exit:
 229         return err;
 230 }
 231
 232 static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
 233 {
 234         struct net_device *dev = dev_get_drvdata(pdev);
 235         struct sja1000_priv *priv = netdev_priv(dev);
 236
 237         unregister_sja1000dev(dev);
 238         dev_set_drvdata(pdev, NULL);
 239
 240         if (mem[idx]) {
 241                 iounmap(priv->reg_base);
 242                 release_mem_region(mem[idx], SJA1000_IOSIZE);
 243         } else {
 244                 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
 245                         release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
 246                 else
 247                         release_region(port[idx], SJA1000_IOSIZE);
 248         }
 249         free_sja1000dev(dev);
 250
 251         return 0;
 252 }
 253
 254 static struct isa_driver sja1000_isa_driver = {
 255         .match = sja1000_isa_match,
 256         .probe = sja1000_isa_probe,
 257         .remove = __devexit_p(sja1000_isa_remove),
 258         .driver = {
 259                 .name = DRV_NAME,
 260         },
 261 };
 262
 263 static int __init sja1000_isa_init(void)
 264 {
 265         int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
 266
 267         if (!err)
 268                 printk(KERN_INFO
 269                        "Legacy %s driver for max. %d devices registered\n",
 270                        DRV_NAME, MAXDEV);
 271         return err;
 272 }
 273
 274 static void __exit sja1000_isa_exit(void)
 275 {
 276         isa_unregister_driver(&sja1000_isa_driver);
 277 }
 278
 279 module_init(sja1000_isa_init);
 280 module_exit(sja1000_isa_exit);