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.h>
  27 #include <linux/can/dev.h>
  28 #include <linux/can/platform/sja1000.h>
  29
  30 #include "sja1000.h"
  31
  32 #define DRV_NAME "sja1000_isa"
  33
  34 #define MAXDEV 8
  35
  36 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
  37 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
  38 MODULE_LICENSE("GPL v2");
  39
  40 #define CLK_DEFAULT     16000000        /* 16 MHz */
  41 #define CDR_DEFAULT     (CDR_CBP | CDR_CLK_OFF)
  42 #define OCR_DEFAULT     OCR_TX0_PUSHPULL
  43
  44 static unsigned long port[MAXDEV];
  45 static unsigned long mem[MAXDEV];
  46 static int __devinitdata irq[MAXDEV];
  47 static int __devinitdata clk[MAXDEV];
  48 static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  49 static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  50 static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  51
  52 module_param_array(port, ulong, NULL, S_IRUGO);
  53 MODULE_PARM_DESC(port, "I/O port number");
  54
  55 module_param_array(mem, ulong, NULL, S_IRUGO);
  56 MODULE_PARM_DESC(mem, "I/O memory address");
  57
  58 module_param_array(indirect, byte, NULL, S_IRUGO);
  59 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
  60
  61 module_param_array(irq, int, NULL, S_IRUGO);
  62 MODULE_PARM_DESC(irq, "IRQ number");
  63
  64 module_param_array(clk, int, NULL, S_IRUGO);
  65 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
  66                  "(default=16000000 [16 MHz])");
  67
  68 module_param_array(cdr, byte, NULL, S_IRUGO);
  69 MODULE_PARM_DESC(cdr, "Clock divider register "
  70                  "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
  71
  72 module_param_array(ocr, byte, NULL, S_IRUGO);
  73 MODULE_PARM_DESC(ocr, "Output control register "
  74                  "(default=0x18 [OCR_TX0_PUSHPULL])");
  75
  76 #define SJA1000_IOSIZE          0x20
  77 #define SJA1000_IOSIZE_INDIRECT 0x02
  78
  79 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
  80 {
  81         return readb(priv->reg_base + reg);
  82 }
  83
  84 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
  85                                       int reg, u8 val)
  86 {
  87         writeb(val, priv->reg_base + reg);
  88 }
  89
  90 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
  91 {
  92         return inb((unsigned long)priv->reg_base + reg);
  93 }
  94
  95 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
  96                                        int reg, u8 val)
  97 {
  98         outb(val, (unsigned long)priv->reg_base + reg);
  99 }
 100
 101 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
 102                                              int reg)
 103 {
 104         unsigned long base = (unsigned long)priv->reg_base;
 105
 106         outb(reg, base);
 107         return inb(base + 1);
 108 }
 109
 110 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
 111                                                 int reg, u8 val)
 112 {
 113         unsigned long base = (unsigned long)priv->reg_base;
 114
 115         outb(reg, base);
 116         outb(val, base + 1);
 117 }
 118
 119 static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
 120 {
 121         if (port[idx] || mem[idx]) {
 122                 if (irq[idx])
 123                         return 1;
 124         } else if (idx)
 125                 return 0;
 126
 127         dev_err(pdev, "insufficient parameters supplied\n");
 128         return 0;
 129 }
 130
 131 static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
 132 {
 133         struct net_device *dev;
 134         struct sja1000_priv *priv;
 135         void __iomem *base = NULL;
 136         int iosize = SJA1000_IOSIZE;
 137         int err;
 138
 139         if (mem[idx]) {
 140                 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
 141                         err = -EBUSY;
 142                         goto exit;
 143                 }
 144                 base = ioremap_nocache(mem[idx], iosize);
 145                 if (!base) {
 146                         err = -ENOMEM;
 147                         goto exit_release;
 148                 }
 149         } else {
 150                 if (indirect[idx] > 0 ||
 151                     (indirect[idx] == -1 && indirect[0] > 0))
 152                         iosize = SJA1000_IOSIZE_INDIRECT;
 153                 if (!request_region(port[idx], iosize, DRV_NAME)) {
 154                         err = -EBUSY;
 155                         goto exit;
 156                 }
 157         }
 158
 159         dev = alloc_sja1000dev(0);
 160         if (!dev) {
 161                 err = -ENOMEM;
 162                 goto exit_unmap;
 163         }
 164         priv = netdev_priv(dev);
 165
 166         dev->irq = irq[idx];
 167         priv->irq_flags = IRQF_SHARED;
 168         if (mem[idx]) {
 169                 priv->reg_base = base;
 170                 dev->base_addr = mem[idx];
 171                 priv->read_reg = sja1000_isa_mem_read_reg;
 172                 priv->write_reg = sja1000_isa_mem_write_reg;
 173         } else {
 174                 priv->reg_base = (void __iomem *)port[idx];
 175                 dev->base_addr = port[idx];
 176
 177                 if (iosize == SJA1000_IOSIZE_INDIRECT) {
 178                         priv->read_reg = sja1000_isa_port_read_reg_indirect;
 179                         priv->write_reg = sja1000_isa_port_write_reg_indirect;
 180                 } else {
 181                         priv->read_reg = sja1000_isa_port_read_reg;
 182                         priv->write_reg = sja1000_isa_port_write_reg;
 183                 }
 184         }
 185
 186         if (clk[idx])
 187                 priv->can.clock.freq = clk[idx] / 2;
 188         else if (clk[0])
 189                 priv->can.clock.freq = clk[0] / 2;
 190         else
 191                 priv->can.clock.freq = CLK_DEFAULT / 2;
 192
 193         if (ocr[idx] != -1)
 194                 priv->ocr = ocr[idx] & 0xff;
 195         else if (ocr[0] != -1)
 196                 priv->ocr = ocr[0] & 0xff;
 197         else
 198                 priv->ocr = OCR_DEFAULT;
 199
 200         if (cdr[idx] != -1)
 201                 priv->cdr = cdr[idx] & 0xff;
 202         else if (cdr[0] != -1)
 203                 priv->cdr = cdr[0] & 0xff;
 204         else
 205                 priv->cdr = CDR_DEFAULT;
 206
 207         dev_set_drvdata(pdev, dev);
 208         SET_NETDEV_DEV(dev, pdev);
 209
 210         err = register_sja1000dev(dev);
 211         if (err) {
 212                 dev_err(pdev, "registering %s failed (err=%d)\n",
 213                         DRV_NAME, err);
 214                 goto exit_unmap;
 215         }
 216
 217         dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
 218                  DRV_NAME, priv->reg_base, dev->irq);
 219         return 0;
 220
 221  exit_unmap:
 222         if (mem[idx])
 223                 iounmap(base);
 224  exit_release:
 225         if (mem[idx])
 226                 release_mem_region(mem[idx], iosize);
 227         else
 228                 release_region(port[idx], iosize);
 229  exit:
 230         return err;
 231 }
 232
 233 static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
 234 {
 235         struct net_device *dev = dev_get_drvdata(pdev);
 236         struct sja1000_priv *priv = netdev_priv(dev);
 237
 238         unregister_sja1000dev(dev);
 239         dev_set_drvdata(pdev, NULL);
 240
 241         if (mem[idx]) {
 242                 iounmap(priv->reg_base);
 243                 release_mem_region(mem[idx], SJA1000_IOSIZE);
 244         } else {
 245                 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
 246                         release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
 247                 else
 248                         release_region(port[idx], SJA1000_IOSIZE);
 249         }
 250         free_sja1000dev(dev);
 251
 252         return 0;
 253 }
 254
 255 static struct isa_driver sja1000_isa_driver = {
 256         .match = sja1000_isa_match,
 257         .probe = sja1000_isa_probe,
 258         .remove = __devexit_p(sja1000_isa_remove),
 259         .driver = {
 260                 .name = DRV_NAME,
 261         },
 262 };
 263
 264 static int __init sja1000_isa_init(void)
 265 {
 266         int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
 267
 268         if (!err)
 269                 printk(KERN_INFO
 270                        "Legacy %s driver for max. %d devices registered\n",
 271                        DRV_NAME, MAXDEV);
 272         return err;
 273 }
 274
 275 static void __exit sja1000_isa_exit(void)
 276 {
 277         isa_unregister_driver(&sja1000_isa_driver);
 278 }
 279
 280 module_init(sja1000_isa_init);
 281 module_exit(sja1000_isa_exit);