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 #include <linux/clk.h>
  19 #include <linux/mutex.h>
  20
  21 #include "clock.h"
  22
  23 static LIST_HEAD(clocks);
  24 static DEFINE_MUTEX(clocks_mutex);
  25
  26 struct clk *clk_get(struct device *dev, const char *id)
  27 {
  28         struct clk *p, *clk = ERR_PTR(-ENOENT);
  29
  30         mutex_lock(&clocks_mutex);
  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         mutex_unlock(&clocks_mutex);
  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 unsigned long clk_get_rate(struct clk *clk)
  61 {
  62         return clk->rate;
  63 }
  64 EXPORT_SYMBOL(clk_get_rate);
  65
  66 long clk_round_rate(struct clk *clk, unsigned long rate)
  67 {
  68         return rate;
  69 }
  70 EXPORT_SYMBOL(clk_round_rate);
  71
  72 int clk_set_rate(struct clk *clk, unsigned long rate)
  73 {
  74         return 0;
  75 }
  76 EXPORT_SYMBOL(clk_set_rate);
  77
  78 int clk_register(struct clk *clk)
  79 {
  80         mutex_lock(&clocks_mutex);
  81         list_add(&clk->node, &clocks);
  82         mutex_unlock(&clocks_mutex);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL(clk_register);
  86
  87 void clk_unregister(struct clk *clk)
  88 {
  89         mutex_lock(&clocks_mutex);
  90         list_del(&clk->node);
  91         mutex_unlock(&clocks_mutex);
  92 }
  93 EXPORT_SYMBOL(clk_unregister);
  94
  95 static int __init clk_init(void)
  96 {
  97         return 0;
  98 }
  99 arch_initcall(clk_init);