LXR linux/arch/arm/mach-omap1/pm

   1/*
   2 * Runtime PM support code for OMAP1
   3 *
   4 * Author: Kevin Hilman, Deep Root Systems, LLC
   5 *
   6 * Copyright (C) 2010 Texas Instruments, Inc.
   7 *
   8 * This file is licensed under the terms of the GNU General Public
   9 * License version 2. This program is licensed "as is" without any
  10 * warranty of any kind, whether express or implied.
  11 */
  12#include <linux/init.h>
  13#include <linux/kernel.h>
  14#include <linux/io.h>
  15#include <linux/pm_runtime.h>
  16#include <linux/pm_clock.h>
  17#include <linux/platform_device.h>
  18#include <linux/mutex.h>
  19#include <linux/clk.h>
  20#include <linux/err.h>
  21
  22#include "soc.h"
  23
  24#ifdef CONFIG_PM_RUNTIME
  25static int omap1_pm_runtime_suspend(struct device *dev)
  26{
  27        int ret;
  28
  29        dev_dbg(dev, "%s\n", __func__);
  30
  31        ret = pm_generic_runtime_suspend(dev);
  32        if (ret)
  33                return ret;
  34
  35        ret = pm_clk_suspend(dev);
  36        if (ret) {
  37                pm_generic_runtime_resume(dev);
  38                return ret;
  39        }
  40
  41        return 0;
  42}
  43
  44static int omap1_pm_runtime_resume(struct device *dev)
  45{
  46        dev_dbg(dev, "%s\n", __func__);
  47
  48        pm_clk_resume(dev);
  49        return pm_generic_runtime_resume(dev);
  50}
  51
  52static struct dev_pm_domain default_pm_domain = {
  53        .ops = {
  54                .runtime_suspend = omap1_pm_runtime_suspend,
  55                .runtime_resume = omap1_pm_runtime_resume,
  56                USE_PLATFORM_PM_SLEEP_OPS
  57        },
  58};
  59#define OMAP1_PM_DOMAIN (&default_pm_domain)
  60#else
  61#define OMAP1_PM_DOMAIN NULL
  62#endif /* CONFIG_PM_RUNTIME */
  63
  64static struct pm_clk_notifier_block platform_bus_notifier = {
  65        .pm_domain = OMAP1_PM_DOMAIN,
  66        .con_ids = { "ick", "fck", NULL, },
  67};
  68
  69static int __init omap1_pm_runtime_init(void)
  70{
  71        if (!cpu_class_is_omap1())
  72                return -ENODEV;
  73
  74        pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
  75
  76        return 0;
  77}
  78core_initcall(omap1_pm_runtime_init);
  79
  80