linux-imx

/*

 * drivers/base/power/clock_ops.c - Generic clock manipulation PM callbacks

 *

 * Copyright (c) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.

 *

 * This file is released under the GPLv2.

 */

​

#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/io.h>

#include <linux/pm.h>

#include <linux/pm_clock.h>

#include <linux/clk.h>

#include <linux/clkdev.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/pm_domain.h>

#include <linux/pm_runtime.h>

​

#ifdef CONFIG_PM_CLK

​

enum pce_status {

    PCE_STATUS_NONE = 0,

    PCE_STATUS_ACQUIRED,

    PCE_STATUS_ENABLED,

    PCE_STATUS_ERROR,

};

​

struct pm_clock_entry {

    struct list_head node;

    char *con_id;

    struct clk *clk;

    enum pce_status status;

};

​

/**

 * pm_clk_enable - Enable a clock, reporting any errors

 * @dev: The device for the given clock

 * @ce: PM clock entry corresponding to the clock.

 */

static inline void __pm_clk_enable(struct device *dev, struct pm_clock_entry *ce)

{

    int ret;

​

    if (ce->status < PCE_STATUS_ERROR) {

        ret = clk_enable(ce->clk);

        if (!ret)

            ce->status = PCE_STATUS_ENABLED;

        else

            dev_err(dev, "%s: failed to enable clk %p, error %d\n",

                __func__, ce->clk, ret);

    }

}

​

/**

 * pm_clk_acquire - Acquire a device clock.

 * @dev: Device whose clock is to be acquired.

 * @ce: PM clock entry corresponding to the clock.

 */

static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)

{

    if (!ce->clk)