LXR linux/arch/arm/mach-mmp/clock.c

   1/*
   2 *  linux/arch/arm/mach-mmp/clock.c
   3 *
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU General Public License version 2 as
   6 *  published by the Free Software Foundation.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/kernel.h>
  11#include <linux/list.h>
  12#include <linux/spinlock.h>
  13#include <linux/clk.h>
  14#include <linux/io.h>
  15
  16#include <mach/regs-apbc.h>
  17#include "clock.h"
  18
  19static void apbc_clk_enable(struct clk *clk)
  20{
  21        uint32_t clk_rst;
  22
  23        clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel);
  24        __raw_writel(clk_rst, clk->clk_rst);
  25}
  26
  27static void apbc_clk_disable(struct clk *clk)
  28{
  29        __raw_writel(0, clk->clk_rst);
  30}
  31
  32struct clkops apbc_clk_ops = {
  33        .enable         = apbc_clk_enable,
  34        .disable        = apbc_clk_disable,
  35};
  36
  37static DEFINE_SPINLOCK(clocks_lock);
  38
  39int clk_enable(struct clk *clk)
  40{
  41        unsigned long flags;
  42
  43        spin_lock_irqsave(&clocks_lock, flags);
  44        if (clk->enabled++ == 0)
  45                clk->ops->enable(clk);
  46        spin_unlock_irqrestore(&clocks_lock, flags);
  47        return 0;
  48}
  49EXPORT_SYMBOL(clk_enable);
  50
  51void clk_disable(struct clk *clk)
  52{
  53        unsigned long flags;
  54
  55        WARN_ON(clk->enabled == 0);
  56
  57        spin_lock_irqsave(&clocks_lock, flags);
  58        if (--clk->enabled == 0)
  59                clk->ops->disable(clk);
  60        spin_unlock_irqrestore(&clocks_lock, flags);
  61}
  62EXPORT_SYMBOL(clk_disable);
  63
  64unsigned long clk_get_rate(struct clk *clk)
  65{
  66        unsigned long rate;
  67
  68        if (clk->ops->getrate)
  69                rate = clk->ops->getrate(clk);
  70        else
  71                rate = clk->rate;
  72
  73        return rate;
  74}
  75EXPORT_SYMBOL(clk_get_rate);
  76
  77void clks_register(struct clk_lookup *clks, size_t num)
  78{
  79        int i;
  80
  81        for (i = 0; i < num; i++)
  82                clkdev_add(&clks[i]);
  83}
  84