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, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/delay.h>
  23 #include <linux/irq.h>
  24 #include <linux/io.h>
  25 #include <linux/can/dev.h>
  26 #include <linux/can/platform/sja1000.h>
  27
  28 #include "sja1000.h"
  29
  30 #define DRV_NAME "sja1000_isa"
  31
  32 #define MAXDEV 8
  33
  34 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
  35 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
  36 MODULE_LICENSE("GPL v2");
  37
  38 #define CLK_DEFAULT     16000000        /* 16 MHz */
  39 #define CDR_DEFAULT     (CDR_CBP | CDR_CLK_OFF)
  40 #define OCR_DEFAULT     OCR_TX0_PUSHPULL
  41
  42 static unsigned long port[MAXDEV];
  43 static unsigned long mem[MAXDEV];
  44 static int irq[MAXDEV];
  45 static int clk[MAXDEV];
  46 static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
  47 static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
  48 static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
  49
  50 module_param_array(port, ulong, NULL, S_IRUGO);
  51 MODULE_PARM_DESC(port, "I/O port number");
  52
  53 module_param_array(mem, ulong, NULL, S_IRUGO);
  54 MODULE_PARM_DESC(mem, "I/O memory address");
  55
  56 module_param_array(indirect, int, NULL, S_IRUGO);
  57 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
  58
  59 module_param_array(irq, int, NULL, S_IRUGO);
  60 MODULE_PARM_DESC(irq, "IRQ number");
  61
  62 module_param_array(clk, int, NULL, S_IRUGO);
  63 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
  64                  "(default=16000000 [16 MHz])");
  65
  66 module_param_array(cdr, byte, NULL, S_IRUGO);
  67 MODULE_PARM_DESC(cdr, "Clock divider register "
  68                  "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
  69
  70 module_param_array(ocr, byte, NULL, S_IRUGO);
  71 MODULE_PARM_DESC(ocr, "Output control register "
  72                  "(default=0x18 [OCR_TX0_PUSHPULL])");
  73
  74 #define SJA1000_IOSIZE          0x20
  75 #define SJA1000_IOSIZE_INDIRECT 0x02
  76
  77 static struct platform_device *sja1000_isa_devs[MAXDEV];
  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 sja1000_isa_probe(struct platform_device *pdev)
 120 {
 121         struct net_device *dev;
 122         struct sja1000_priv *priv;
 123         void __iomem *base = NULL;
 124         int iosize = SJA1000_IOSIZE;
 125         int idx = pdev->id;
 126         int err;
 127
 128         dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
 129                 idx, port[idx], mem[idx], irq[idx]);
 130
 131         if (mem[idx]) {
 132                 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
 133                         err = -EBUSY;
 134                         goto exit;
 135                 }
 136                 base = ioremap_nocache(mem[idx], iosize);
 137                 if (!base) {
 138                         err = -ENOMEM;
 139                         goto exit_release;
 140                 }
 141         } else {
 142                 if (indirect[idx] > 0 ||
 143                     (indirect[idx] == -1 && indirect[0] > 0))
 144                         iosize = SJA1000_IOSIZE_INDIRECT;
 145                 if (!request_region(port[idx], iosize, DRV_NAME)) {
 146                         err = -EBUSY;
 147                         goto exit;
 148                 }
 149         }
 150
 151         dev = alloc_sja1000dev(0);
 152         if (!dev) {
 153                 err = -ENOMEM;
 154                 goto exit_unmap;
 155         }
 156         priv = netdev_priv(dev);
 157
 158         dev->irq = irq[idx];
 159         priv->irq_flags = IRQF_SHARED;
 160         if (mem[idx]) {
 161                 priv->reg_base = base;
 162                 dev->base_addr = mem[idx];
 163                 priv->read_reg = sja1000_isa_mem_read_reg;
 164                 priv->write_reg = sja1000_isa_mem_write_reg;
 165         } else {
 166                 priv->reg_base = (void __iomem *)port[idx];
 167                 dev->base_addr = port[idx];
 168
 169                 if (iosize == SJA1000_IOSIZE_INDIRECT) {
 170                         priv->read_reg = sja1000_isa_port_read_reg_indirect;
 171                         priv->write_reg = sja1000_isa_port_write_reg_indirect;
 172                 } else {
 173                         priv->read_reg = sja1000_isa_port_read_reg;
 174                         priv->write_reg = sja1000_isa_port_write_reg;
 175                 }
 176         }
 177
 178         if (clk[idx])
 179                 priv->can.clock.freq = clk[idx] / 2;
 180         else if (clk[0])
 181                 priv->can.clock.freq = clk[0] / 2;
 182         else
 183                 priv->can.clock.freq = CLK_DEFAULT / 2;
 184
 185         if (ocr[idx] != 0xff)
 186                 priv->ocr = ocr[idx];
 187         else if (ocr[0] != 0xff)
 188                 priv->ocr = ocr[0];
 189         else
 190                 priv->ocr = OCR_DEFAULT;
 191
 192         if (cdr[idx] != 0xff)
 193                 priv->cdr = cdr[idx];
 194         else if (cdr[0] != 0xff)
 195                 priv->cdr = cdr[0];
 196         else
 197                 priv->cdr = CDR_DEFAULT;
 198
 199         platform_set_drvdata(pdev, dev);
 200         SET_NETDEV_DEV(dev, &pdev->dev);
 201
 202         err = register_sja1000dev(dev);
 203         if (err) {
 204                 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
 205                         DRV_NAME, err);
 206                 goto exit_unmap;
 207         }
 208
 209         dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
 210                  DRV_NAME, priv->reg_base, dev->irq);
 211         return 0;
 212
 213  exit_unmap:
 214         if (mem[idx])
 215                 iounmap(base);
 216  exit_release:
 217         if (mem[idx])
 218                 release_mem_region(mem[idx], iosize);
 219         else
 220                 release_region(port[idx], iosize);
 221  exit:
 222         return err;
 223 }
 224
 225 static int sja1000_isa_remove(struct platform_device *pdev)
 226 {
 227         struct net_device *dev = platform_get_drvdata(pdev);
 228         struct sja1000_priv *priv = netdev_priv(dev);
 229         int idx = pdev->id;
 230
 231         unregister_sja1000dev(dev);
 232
 233         if (mem[idx]) {
 234                 iounmap(priv->reg_base);
 235                 release_mem_region(mem[idx], SJA1000_IOSIZE);
 236         } else {
 237                 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
 238                         release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
 239                 else
 240                         release_region(port[idx], SJA1000_IOSIZE);
 241         }
 242         free_sja1000dev(dev);
 243
 244         return 0;
 245 }
 246
 247 static struct platform_driver sja1000_isa_driver = {
 248         .probe = sja1000_isa_probe,
 249         .remove = sja1000_isa_remove,
 250         .driver = {
 251                 .name = DRV_NAME,
 252                 .owner = THIS_MODULE,
 253         },
 254 };
 255
 256 static int __init sja1000_isa_init(void)
 257 {
 258         int idx, err;
 259
 260         for (idx = 0; idx < MAXDEV; idx++) {
 261                 if ((port[idx] || mem[idx]) && irq[idx]) {
 262                         sja1000_isa_devs[idx] =
 263                                 platform_device_alloc(DRV_NAME, idx);
 264                         if (!sja1000_isa_devs[idx]) {
 265                                 err = -ENOMEM;
 266                                 goto exit_free_devices;
 267                         }
 268                         err = platform_device_add(sja1000_isa_devs[idx]);
 269                         if (err) {
 270                                 platform_device_put(sja1000_isa_devs[idx]);
 271                                 goto exit_free_devices;
 272                         }
 273                         pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
 274                                  "irq=%d\n",
 275                                  DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
 276                 } else if (idx == 0 || port[idx] || mem[idx]) {
 277                                 pr_err("%s: insufficient parameters supplied\n",
 278                                        DRV_NAME);
 279                                 err = -EINVAL;
 280                                 goto exit_free_devices;
 281                 }
 282         }
 283
 284         err = platform_driver_register(&sja1000_isa_driver);
 285         if (err)
 286                 goto exit_free_devices;
 287
 288         pr_info("Legacy %s driver for max. %d devices registered\n",
 289                 DRV_NAME, MAXDEV);
 290
 291         return 0;
 292
 293 exit_free_devices:
 294         while (--idx >= 0) {
 295                 if (sja1000_isa_devs[idx])
 296                         platform_device_unregister(sja1000_isa_devs[idx]);
 297         }
 298
 299         return err;
 300 }
 301
 302 static void __exit sja1000_isa_exit(void)
 303 {
 304         int idx;
 305
 306         platform_driver_unregister(&sja1000_isa_driver);
 307         for (idx = 0; idx < MAXDEV; idx++) {
 308                 if (sja1000_isa_devs[idx])
 309                         platform_device_unregister(sja1000_isa_devs[idx]);
 310         }
 311 }
 312
 313 module_init(sja1000_isa_init);
 314 module_exit(sja1000_isa_exit);