arch/arm/mach-shmobile/pm_runtime.c

   1 /*
   2  * arch/arm/mach-shmobile/pm_runtime.c
   3  *
   4  * Runtime PM support code for SuperH Mobile ARM
   5  *
   6  *  Copyright (C) 2009-2010 Magnus Damm
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/io.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/pm_domain.h>
  18 #include <linux/pm_clock.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/clk.h>
  21 #include <linux/sh_clk.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/slab.h>
  24
  25 #ifdef CONFIG_PM_RUNTIME
  26
  27 static int default_platform_runtime_idle(struct device *dev)
  28 {
  29         /* suspend synchronously to disable clocks immediately */
  30         return pm_runtime_suspend(dev);
  31 }
  32
  33 static struct dev_pm_domain default_pm_domain = {
  34         .ops = {
  35                 .runtime_suspend = pm_clk_suspend,
  36                 .runtime_resume = pm_clk_resume,
  37                 .runtime_idle = default_platform_runtime_idle,
  38                 USE_PLATFORM_PM_SLEEP_OPS
  39         },
  40 };
  41
  42 #define DEFAULT_PM_DOMAIN_PTR   (&default_pm_domain)
  43
  44 #else
  45
  46 #define DEFAULT_PM_DOMAIN_PTR   NULL
  47
  48 #endif /* CONFIG_PM_RUNTIME */
  49
  50 static struct pm_clk_notifier_block platform_bus_notifier = {
  51         .pm_domain = DEFAULT_PM_DOMAIN_PTR,
  52         .con_ids = { NULL, },
  53 };
  54
  55 static int __init sh_pm_runtime_init(void)
  56 {
  57         pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
  58         return 0;
  59 }
  60 core_initcall(sh_pm_runtime_init);
  61
  62 static int __init sh_pm_runtime_late_init(void)
  63 {
  64         pm_genpd_poweroff_unused();
  65         return 0;
  66 }
  67 late_initcall(sh_pm_runtime_late_init);