clock.c

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/*
 *  linux/arch/arm/mach-sa1100/clock.c
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/clkdev.h>

#include "clock.h"

static DEFINE_SPINLOCK(clocks_lock);

int clk_enable(struct clk *clk)
{
    unsigned long flags;

    spin_lock_irqsave(&clocks_lock, flags);
    if (clk->enabled++ == 0)
        clk->ops->enable(clk);
    spin_unlock_irqrestore(&clocks_lock, flags);

    if (clk->delay)
        udelay(clk->delay);

    return 0;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
    unsigned long flags;

    WARN_ON(clk->enabled == 0);

    spin_lock_irqsave(&clocks_lock, flags);
    if (--clk->enabled == 0)
        clk->ops->disable(clk);
    spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
    unsigned long rate;

    rate = clk->rate;
    if (clk->ops->getrate)
        rate = clk->ops->getrate(clk);

    return rate;
}
EXPORT_SYMBOL(clk_get_rate);

int clk_set_rate(struct clk *clk, unsigned long rate)
{
    unsigned long flags;
    int ret = -EINVAL;

    if (clk->ops->setrate) {
        spin_lock_irqsave(&clocks_lock, flags);
        ret = clk->ops->setrate(clk, rate);
        spin_unlock_irqrestore(&clocks_lock, flags);
    }

    return ret;
}
EXPORT_SYMBOL(clk_set_rate);

void clk_dummy_enable(struct clk *clk)
{
}

void clk_dummy_disable(struct clk *clk)
{
}

const struct clkops clk_dummy_ops = {
    .enable     = clk_dummy_enable,
    .disable    = clk_dummy_disable,
};

struct clk clk_dummy = {
    .ops        = &clk_dummy_ops,
};