sja1000_isa.c 7.0 KB

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