pm_bus.c

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/*
 * Runtime PM support code for OMAP1
 *
 * Author: Kevin Hilman, Deep Root Systems, LLC
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/pm_clock.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <plat/omap_device.h>
#include <plat/omap-pm.h>

#ifdef CONFIG_PM_RUNTIME
static int omap1_pm_runtime_suspend(struct device *dev)
{
    int ret;

    dev_dbg(dev, "%s\n", __func__);

    ret = pm_generic_runtime_suspend(dev);
    if (ret)
        return ret;

    ret = pm_clk_suspend(dev);
    if (ret) {
        pm_generic_runtime_resume(dev);
        return ret;
    }

    return 0;
}

static int omap1_pm_runtime_resume(struct device *dev)
{
    dev_dbg(dev, "%s\n", __func__);

    pm_clk_resume(dev);
    return pm_generic_runtime_resume(dev);
}

static struct dev_pm_domain default_pm_domain = {
    .ops = {
        .runtime_suspend = omap1_pm_runtime_suspend,
        .runtime_resume = omap1_pm_runtime_resume,
        USE_PLATFORM_PM_SLEEP_OPS
    },
};
#define OMAP1_PM_DOMAIN (&default_pm_domain)
#else
#define OMAP1_PM_DOMAIN NULL
#endif /* CONFIG_PM_RUNTIME */

static struct pm_clk_notifier_block platform_bus_notifier = {
    .pm_domain = OMAP1_PM_DOMAIN,
    .con_ids = { "ick", "fck", NULL, },
};

static int __init omap1_pm_runtime_init(void)
{
    if (!cpu_class_is_omap1())
        return -ENODEV;

    pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);

    return 0;
}
core_initcall(omap1_pm_runtime_init);