arch/arm/mach-aaec2000/clock.c

   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
  19 #include <asm/semaphore.h>
  20 #include <asm/hardware/clock.h>
  21
  22 #include "clock.h"
  23
  24 static LIST_HEAD(clocks);
  25 static DECLARE_MUTEX(clocks_sem);
  26
  27 struct clk *clk_get(struct device *dev, const char *id)
  28 {
  29         struct clk *p, *clk = ERR_PTR(-ENOENT);
  30
  31         down(&clocks_sem);
  32         list_for_each_entry(p, &clocks, node) {
  33                 if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
  34                         clk = p;
  35                         break;
  36                 }
  37         }
  38         up(&clocks_sem);
  39
  40         return clk;
  41 }
  42 EXPORT_SYMBOL(clk_get);
  43
  44 void clk_put(struct clk *clk)
  45 {
  46         module_put(clk->owner);
  47 }
  48 EXPORT_SYMBOL(clk_put);
  49
  50 int clk_enable(struct clk *clk)
  51 {
  52         return 0;
  53 }
  54 EXPORT_SYMBOL(clk_enable);
  55
  56 void clk_disable(struct clk *clk)
  57 {
  58 }
  59 EXPORT_SYMBOL(clk_disable);
  60
  61 int clk_use(struct clk *clk)
  62 {
  63         return 0;
  64 }
  65 EXPORT_SYMBOL(clk_use);
  66
  67 void clk_unuse(struct clk *clk)
  68 {
  69 }
  70 EXPORT_SYMBOL(clk_unuse);
  71
  72 unsigned long clk_get_rate(struct clk *clk)
  73 {
  74         return clk->rate;
  75 }
  76 EXPORT_SYMBOL(clk_get_rate);
  77
  78 long clk_round_rate(struct clk *clk, unsigned long rate)
  79 {
  80         return rate;
  81 }
  82 EXPORT_SYMBOL(clk_round_rate);
  83
  84 int clk_set_rate(struct clk *clk, unsigned long rate)
  85 {
  86         return 0;
  87 }
  88 EXPORT_SYMBOL(clk_set_rate);
  89
  90 int clk_register(struct clk *clk)
  91 {
  92         down(&clocks_sem);
  93         list_add(&clk->node, &clocks);
  94         up(&clocks_sem);
  95         return 0;
  96 }
  97 EXPORT_SYMBOL(clk_register);
  98
  99 void clk_unregister(struct clk *clk)
 100 {
 101         down(&clocks_sem);
 102         list_del(&clk->node);
 103         up(&clocks_sem);
 104 }
 105 EXPORT_SYMBOL(clk_unregister);
 106
 107 static int __init clk_init(void)
 108 {
 109         return 0;
 110 }
 111 arch_initcall(clk_init);