LXR linux/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/list.h>
   7#include <linux/errno.h>
   8#include <linux/err.h>
   9#include <linux/string.h>
  10#include <linux/clk.h>
  11#include <linux/spinlock.h>
  12#include <linux/platform_device.h>
  13#include <linux/delay.h>
  14
  15#include <asm/clkdev.h>
  16#include <mach/pxa2xx-regs.h>
  17#include <mach/hardware.h>
  18
  19#include "devices.h"
  20#include "generic.h"
  21#include "clock.h"
  22
  23static DEFINE_SPINLOCK(clocks_lock);
  24
  25int clk_enable(struct clk *clk)
  26{
  27        unsigned long flags;
  28
  29        spin_lock_irqsave(&clocks_lock, flags);
  30        if (clk->enabled++ == 0)
  31                clk->ops->enable(clk);
  32        spin_unlock_irqrestore(&clocks_lock, flags);
  33
  34        if (clk->delay)
  35                udelay(clk->delay);
  36
  37        return 0;
  38}
  39EXPORT_SYMBOL(clk_enable);
  40
  41void clk_disable(struct clk *clk)
  42{
  43        unsigned long flags;
  44
  45        WARN_ON(clk->enabled == 0);
  46
  47        spin_lock_irqsave(&clocks_lock, flags);
  48        if (--clk->enabled == 0)
  49                clk->ops->disable(clk);
  50        spin_unlock_irqrestore(&clocks_lock, flags);
  51}
  52EXPORT_SYMBOL(clk_disable);
  53
  54unsigned long clk_get_rate(struct clk *clk)
  55{
  56        unsigned long rate;
  57
  58        rate = clk->rate;
  59        if (clk->ops->getrate)
  60                rate = clk->ops->getrate(clk);
  61
  62        return rate;
  63}
  64EXPORT_SYMBOL(clk_get_rate);
  65
  66
  67void clk_cken_enable(struct clk *clk)
  68{
  69        CKEN |= 1 << clk->cken;
  70}
  71
  72void clk_cken_disable(struct clk *clk)
  73{
  74        CKEN &= ~(1 << clk->cken);
  75}
  76
  77const struct clkops clk_cken_ops = {
  78        .enable         = clk_cken_enable,
  79        .disable        = clk_cken_disable,
  80};
  81
  82void clks_register(struct clk_lookup *clks, size_t num)
  83{
  84        int i;
  85
  86        for (i = 0; i < num; i++)
  87                clkdev_add(&clks[i]);
  88}
  89