arch/arm/mach-pxa/clock.c

   1 /*
   2  *  linux/arch/arm/mach-sa1100/clock.c
   3  */
   4 #include <linux/module.h>
   5 #include <linux/kernel.h>
   6 #include <linux/clk.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/delay.h>
   9
  10 #include <asm/clkdev.h>
  11
  12 #include "clock.h"
  13
  14 static DEFINE_SPINLOCK(clocks_lock);
  15
  16 int clk_enable(struct clk *clk)
  17 {
  18         unsigned long flags;
  19
  20         spin_lock_irqsave(&clocks_lock, flags);
  21         if (clk->enabled++ == 0)
  22                 clk->ops->enable(clk);
  23         spin_unlock_irqrestore(&clocks_lock, flags);
  24
  25         if (clk->delay)
  26                 udelay(clk->delay);
  27
  28         return 0;
  29 }
  30 EXPORT_SYMBOL(clk_enable);
  31
  32 void clk_disable(struct clk *clk)
  33 {
  34         unsigned long flags;
  35
  36         WARN_ON(clk->enabled == 0);
  37
  38         spin_lock_irqsave(&clocks_lock, flags);
  39         if (--clk->enabled == 0)
  40                 clk->ops->disable(clk);
  41         spin_unlock_irqrestore(&clocks_lock, flags);
  42 }
  43 EXPORT_SYMBOL(clk_disable);
  44
  45 unsigned long clk_get_rate(struct clk *clk)
  46 {
  47         unsigned long rate;
  48
  49         rate = clk->rate;
  50         if (clk->ops->getrate)
  51                 rate = clk->ops->getrate(clk);
  52
  53         return rate;
  54 }
  55 EXPORT_SYMBOL(clk_get_rate);
  56
  57 void clk_dummy_enable(struct clk *clk)
  58 {
  59 }
  60
  61 void clk_dummy_disable(struct clk *clk)
  62 {
  63 }
  64
  65 const struct clkops clk_dummy_ops = {
  66         .enable         = clk_dummy_enable,
  67         .disable        = clk_dummy_disable,
  68 };
  69
  70 struct clk clk_dummy = {
  71         .ops            = &clk_dummy_ops,
  72 };