git.oblomov.eu Git - linux-2.6/blob - 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
  18 #include <asm/semaphore.h>
  19 #include <asm/hardware/clock.h>
  20
  21 #include "clock.h"
  22
  23 static LIST_HEAD(clocks);
  24 static DECLARE_MUTEX(clocks_sem);
  25
  26 struct clk *clk_get(struct device *dev, const char *id)
  27 {
  28         struct clk *p, *clk = ERR_PTR(-ENOENT);
  29
  30         down(&clocks_sem);
  31         list_for_each_entry(p, &clocks, node) {
  32                 if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
  33                         clk = p;
  34                         break;
  35                 }
  36         }
  37         up(&clocks_sem);
  38
  39         return clk;
  40 }
  41 EXPORT_SYMBOL(clk_get);
  42
  43 void clk_put(struct clk *clk)
  44 {
  45         module_put(clk->owner);
  46 }
  47 EXPORT_SYMBOL(clk_put);
  48
  49 int clk_enable(struct clk *clk)
  50 {
  51         return 0;
  52 }
  53 EXPORT_SYMBOL(clk_enable);
  54
  55 void clk_disable(struct clk *clk)
  56 {
  57 }
  58 EXPORT_SYMBOL(clk_disable);
  59
  60 int clk_use(struct clk *clk)
  61 {
  62         return 0;
  63 }
  64 EXPORT_SYMBOL(clk_use);
  65
  66 void clk_unuse(struct clk *clk)
  67 {
  68 }
  69 EXPORT_SYMBOL(clk_unuse);
  70
  71 unsigned long clk_get_rate(struct clk *clk)
  72 {
  73         return clk->rate;
  74 }
  75 EXPORT_SYMBOL(clk_get_rate);
  76
  77 long clk_round_rate(struct clk *clk, unsigned long rate)
  78 {
  79         return rate;
  80 }
  81 EXPORT_SYMBOL(clk_round_rate);
  82
  83 int clk_set_rate(struct clk *clk, unsigned long rate)
  84 {
  85         return 0;
  86 }
  87 EXPORT_SYMBOL(clk_set_rate);
  88
  89 int clk_register(struct clk *clk)
  90 {
  91         down(&clocks_sem);
  92         list_add(&clk->node, &clocks);
  93         up(&clocks_sem);
  94         return 0;
  95 }
  96 EXPORT_SYMBOL(clk_register);
  97
  98 void clk_unregister(struct clk *clk)
  99 {
 100         down(&clocks_sem);
 101         list_del(&clk->node);
 102         up(&clocks_sem);
 103 }
 104 EXPORT_SYMBOL(clk_unregister);
 105
 106 static int __init clk_init(void)
 107 {
 108         return 0;
 109 }
 110 arch_initcall(clk_init);