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 #include <linux/clkdev.h>
  10
  11 #include "clock.h"
  12
  13 static DEFINE_SPINLOCK(clocks_lock);
  14
  15 int clk_enable(struct clk *clk)
  16 {
  17         unsigned long flags;
  18
  19         spin_lock_irqsave(&clocks_lock, flags);
  20         if (clk->enabled++ == 0)
  21                 clk->ops->enable(clk);
  22         spin_unlock_irqrestore(&clocks_lock, flags);
  23
  24         if (clk->delay)
  25                 udelay(clk->delay);
  26
  27         return 0;
  28 }
  29 EXPORT_SYMBOL(clk_enable);
  30
  31 void clk_disable(struct clk *clk)
  32 {
  33         unsigned long flags;
  34
  35         WARN_ON(clk->enabled == 0);
  36
  37         spin_lock_irqsave(&clocks_lock, flags);
  38         if (--clk->enabled == 0)
  39                 clk->ops->disable(clk);
  40         spin_unlock_irqrestore(&clocks_lock, flags);
  41 }
  42 EXPORT_SYMBOL(clk_disable);
  43
  44 unsigned long clk_get_rate(struct clk *clk)
  45 {
  46         unsigned long rate;
  47
  48         rate = clk->rate;
  49         if (clk->ops->getrate)
  50                 rate = clk->ops->getrate(clk);
  51
  52         return rate;
  53 }
  54 EXPORT_SYMBOL(clk_get_rate);
  55
  56 int clk_set_rate(struct clk *clk, unsigned long rate)
  57 {
  58         unsigned long flags;
  59         int ret = -EINVAL;
  60
  61         if (clk->ops->setrate) {
  62                 spin_lock_irqsave(&clocks_lock, flags);
  63                 ret = clk->ops->setrate(clk, rate);
  64                 spin_unlock_irqrestore(&clocks_lock, flags);
  65         }
  66
  67         return ret;
  68 }
  69 EXPORT_SYMBOL(clk_set_rate);
  70
  71 void clk_dummy_enable(struct clk *clk)
  72 {
  73 }
  74
  75 void clk_dummy_disable(struct clk *clk)
  76 {
  77 }
  78
  79 const struct clkops clk_dummy_ops = {
  80         .enable         = clk_dummy_enable,
  81         .disable        = clk_dummy_disable,
  82 };
  83
  84 struct clk clk_dummy = {
  85         .ops            = &clk_dummy_ops,
  86 };