clock.c 1.9 KB

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  1. /*
  2. * linux/arch/arm/mach-aaec2000/clock.c
  3. *
  4. * Copyright (C) 2005 Nicolas Bellido Y Ortega
  5. *
  6. * Based on linux/arch/arm/mach-integrator/clock.c
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License version 2 as
  10. * published by the Free Software Foundation.
  11. */
  12. #include <linux/module.h>
  13. #include <linux/kernel.h>
  14. #include <linux/list.h>
  15. #include <linux/errno.h>
  16. #include <linux/err.h>
  17. #include <linux/string.h>
  18. #include <linux/clk.h>
  19. #include <linux/mutex.h>
  20. #include <asm/semaphore.h>
  21. #include "clock.h"
  22. static LIST_HEAD(clocks);
  23. static DEFINE_MUTEX(clocks_mutex);
  24. struct clk *clk_get(struct device *dev, const char *id)
  25. {
  26. struct clk *p, *clk = ERR_PTR(-ENOENT);
  27. mutex_lock(&clocks_mutex);
  28. list_for_each_entry(p, &clocks, node) {
  29. if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
  30. clk = p;
  31. break;
  32. }
  33. }
  34. mutex_unlock(&clocks_mutex);
  35. return clk;
  36. }
  37. EXPORT_SYMBOL(clk_get);
  38. void clk_put(struct clk *clk)
  39. {
  40. module_put(clk->owner);
  41. }
  42. EXPORT_SYMBOL(clk_put);
  43. int clk_enable(struct clk *clk)
  44. {
  45. return 0;
  46. }
  47. EXPORT_SYMBOL(clk_enable);
  48. void clk_disable(struct clk *clk)
  49. {
  50. }
  51. EXPORT_SYMBOL(clk_disable);
  52. unsigned long clk_get_rate(struct clk *clk)
  53. {
  54. return clk->rate;
  55. }
  56. EXPORT_SYMBOL(clk_get_rate);
  57. long clk_round_rate(struct clk *clk, unsigned long rate)
  58. {
  59. return rate;
  60. }
  61. EXPORT_SYMBOL(clk_round_rate);
  62. int clk_set_rate(struct clk *clk, unsigned long rate)
  63. {
  64. return 0;
  65. }
  66. EXPORT_SYMBOL(clk_set_rate);
  67. int clk_register(struct clk *clk)
  68. {
  69. mutex_lock(&clocks_mutex);
  70. list_add(&clk->node, &clocks);
  71. mutex_unlock(&clocks_mutex);
  72. return 0;
  73. }
  74. EXPORT_SYMBOL(clk_register);
  75. void clk_unregister(struct clk *clk)
  76. {
  77. mutex_lock(&clocks_mutex);
  78. list_del(&clk->node);
  79. mutex_unlock(&clocks_mutex);
  80. }
  81. EXPORT_SYMBOL(clk_unregister);
  82. static int __init clk_init(void)
  83. {
  84. return 0;
  85. }
  86. arch_initcall(clk_init);