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/platform_device.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 irq[MAXDEV];
  46 static int clk[MAXDEV];
  47 static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
  48 static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
  49 static int 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, int, 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 struct platform_device *sja1000_isa_devs[MAXDEV];
  79
  80 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
  81 {
  82         return readb(priv->reg_base + reg);
  83 }
  84
  85 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
  86                                       int reg, u8 val)
  87 {
  88         writeb(val, priv->reg_base + reg);
  89 }
  90
  91 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
  92 {
  93         return inb((unsigned long)priv->reg_base + reg);
  94 }
  95
  96 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
  97                                        int reg, u8 val)
  98 {
  99         outb(val, (unsigned long)priv->reg_base + reg);
 100 }
 101
 102 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
 103                                              int reg)
 104 {
 105         unsigned long base = (unsigned long)priv->reg_base;
 106
 107         outb(reg, base);
 108         return inb(base + 1);
 109 }
 110
 111 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
 112                                                 int reg, u8 val)
 113 {
 114         unsigned long base = (unsigned long)priv->reg_base;
 115
 116         outb(reg, base);
 117         outb(val, base + 1);
 118 }
 119
 120 static int sja1000_isa_probe(struct platform_device *pdev)
 121 {
 122         struct net_device *dev;
 123         struct sja1000_priv *priv;
 124         void __iomem *base = NULL;
 125         int iosize = SJA1000_IOSIZE;
 126         int idx = pdev->id;
 127         int err;
 128
 129         dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
 130                 idx, port[idx], mem[idx], irq[idx]);
 131
 132         if (mem[idx]) {
 133                 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
 134                         err = -EBUSY;
 135                         goto exit;
 136                 }
 137                 base = ioremap_nocache(mem[idx], iosize);
 138                 if (!base) {
 139                         err = -ENOMEM;
 140                         goto exit_release;
 141                 }
 142         } else {
 143                 if (indirect[idx] > 0 ||
 144                     (indirect[idx] == -1 && indirect[0] > 0))
 145                         iosize = SJA1000_IOSIZE_INDIRECT;
 146                 if (!request_region(port[idx], iosize, DRV_NAME)) {
 147                         err = -EBUSY;
 148                         goto exit;
 149                 }
 150         }
 151
 152         dev = alloc_sja1000dev(0);
 153         if (!dev) {
 154                 err = -ENOMEM;
 155                 goto exit_unmap;
 156         }
 157         priv = netdev_priv(dev);
 158
 159         dev->irq = irq[idx];
 160         priv->irq_flags = IRQF_SHARED;
 161         if (mem[idx]) {
 162                 priv->reg_base = base;
 163                 dev->base_addr = mem[idx];
 164                 priv->read_reg = sja1000_isa_mem_read_reg;
 165                 priv->write_reg = sja1000_isa_mem_write_reg;
 166         } else {
 167                 priv->reg_base = (void __iomem *)port[idx];
 168                 dev->base_addr = port[idx];
 169
 170                 if (iosize == SJA1000_IOSIZE_INDIRECT) {
 171                         priv->read_reg = sja1000_isa_port_read_reg_indirect;
 172                         priv->write_reg = sja1000_isa_port_write_reg_indirect;
 173                 } else {
 174                         priv->read_reg = sja1000_isa_port_read_reg;
 175                         priv->write_reg = sja1000_isa_port_write_reg;
 176                 }
 177         }
 178
 179         if (clk[idx])
 180                 priv->can.clock.freq = clk[idx] / 2;
 181         else if (clk[0])
 182                 priv->can.clock.freq = clk[0] / 2;
 183         else
 184                 priv->can.clock.freq = CLK_DEFAULT / 2;
 185
 186         if (ocr[idx] != 0xff)
 187                 priv->ocr = ocr[idx];
 188         else if (ocr[0] != 0xff)
 189                 priv->ocr = ocr[0];
 190         else
 191                 priv->ocr = OCR_DEFAULT;
 192
 193         if (cdr[idx] != 0xff)
 194                 priv->cdr = cdr[idx];
 195         else if (cdr[0] != 0xff)
 196                 priv->cdr = cdr[0];
 197         else
 198                 priv->cdr = CDR_DEFAULT;
 199
 200         dev_set_drvdata(&pdev->dev, dev);
 201         SET_NETDEV_DEV(dev, &pdev->dev);
 202
 203         err = register_sja1000dev(dev);
 204         if (err) {
 205                 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
 206                         DRV_NAME, err);
 207                 goto exit_unmap;
 208         }
 209
 210         dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
 211                  DRV_NAME, priv->reg_base, dev->irq);
 212         return 0;
 213
 214  exit_unmap:
 215         if (mem[idx])
 216                 iounmap(base);
 217  exit_release:
 218         if (mem[idx])
 219                 release_mem_region(mem[idx], iosize);
 220         else
 221                 release_region(port[idx], iosize);
 222  exit:
 223         return err;
 224 }
 225
 226 static int sja1000_isa_remove(struct platform_device *pdev)
 227 {
 228         struct net_device *dev = dev_get_drvdata(&pdev->dev);
 229         struct sja1000_priv *priv = netdev_priv(dev);
 230         int idx = pdev->id;
 231
 232         unregister_sja1000dev(dev);
 233         dev_set_drvdata(&pdev->dev, NULL);
 234
 235         if (mem[idx]) {
 236                 iounmap(priv->reg_base);
 237                 release_mem_region(mem[idx], SJA1000_IOSIZE);
 238         } else {
 239                 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
 240                         release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
 241                 else
 242                         release_region(port[idx], SJA1000_IOSIZE);
 243         }
 244         free_sja1000dev(dev);
 245
 246         return 0;
 247 }
 248
 249 static struct platform_driver sja1000_isa_driver = {
 250         .probe = sja1000_isa_probe,
 251         .remove = sja1000_isa_remove,
 252         .driver = {
 253                 .name = DRV_NAME,
 254                 .owner = THIS_MODULE,
 255         },
 256 };
 257
 258 static int __init sja1000_isa_init(void)
 259 {
 260         int idx, err;
 261
 262         for (idx = 0; idx < MAXDEV; idx++) {
 263                 if ((port[idx] || mem[idx]) && irq[idx]) {
 264                         sja1000_isa_devs[idx] =
 265                                 platform_device_alloc(DRV_NAME, idx);
 266                         if (!sja1000_isa_devs[idx]) {
 267                                 err = -ENOMEM;
 268                                 goto exit_free_devices;
 269                         }
 270                         err = platform_device_add(sja1000_isa_devs[idx]);
 271                         if (err) {
 272                                 platform_device_put(sja1000_isa_devs[idx]);
 273                                 goto exit_free_devices;
 274                         }
 275                         pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
 276                                  "irq=%d\n",
 277                                  DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
 278                 } else if (idx == 0 || port[idx] || mem[idx]) {
 279                                 pr_err("%s: insufficient parameters supplied\n",
 280                                        DRV_NAME);
 281                                 err = -EINVAL;
 282                                 goto exit_free_devices;
 283                 }
 284         }
 285
 286         err = platform_driver_register(&sja1000_isa_driver);
 287         if (err)
 288                 goto exit_free_devices;
 289
 290         pr_info("Legacy %s driver for max. %d devices registered\n",
 291                 DRV_NAME, MAXDEV);
 292
 293         return 0;
 294
 295 exit_free_devices:
 296         while (--idx >= 0) {
 297                 if (sja1000_isa_devs[idx])
 298                         platform_device_unregister(sja1000_isa_devs[idx]);
 299         }
 300
 301         return err;
 302 }
 303
 304 static void __exit sja1000_isa_exit(void)
 305 {
 306         int idx;
 307
 308         platform_driver_unregister(&sja1000_isa_driver);
 309         for (idx = 0; idx < MAXDEV; idx++) {
 310                 if (sja1000_isa_devs[idx])
 311                         platform_device_unregister(sja1000_isa_devs[idx]);
 312         }
 313 }
 314
 315 module_init(sja1000_isa_init);
 316 module_exit(sja1000_isa_exit);