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