arch/arm/mach-omap1/pm_bus.c

   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
  25 static 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
  44 static 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
  52 static 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
  64 static struct pm_clk_notifier_block platform_bus_notifier = {
  65         .pm_domain = OMAP1_PM_DOMAIN,
  66         .con_ids = { "ick", "fck", NULL, },
  67 };
  68
  69 static 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 }
  78 core_initcall(omap1_pm_runtime_init);
  79