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/platform_device.h>
  19 #include <linux/clk.h>
  20 #include <linux/sh_clk.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/slab.h>
  23
  24 #ifdef CONFIG_PM_RUNTIME
  25
  26 static int default_platform_runtime_idle(struct device *dev)
  27 {
  28         /* suspend synchronously to disable clocks immediately */
  29         return pm_runtime_suspend(dev);
  30 }
  31
  32 static struct dev_pm_domain default_pm_domain = {
  33         .ops = {
  34                 .runtime_suspend = pm_clk_suspend,
  35                 .runtime_resume = pm_clk_resume,
  36                 .runtime_idle = default_platform_runtime_idle,
  37                 USE_PLATFORM_PM_SLEEP_OPS
  38         },
  39 };
  40
  41 #define DEFAULT_PM_DOMAIN_PTR   (&default_pm_domain)
  42
  43 #else
  44
  45 #define DEFAULT_PM_DOMAIN_PTR   NULL
  46
  47 #endif /* CONFIG_PM_RUNTIME */
  48
  49 static struct pm_clk_notifier_block platform_bus_notifier = {
  50         .pm_domain = DEFAULT_PM_DOMAIN_PTR,
  51         .con_ids = { NULL, },
  52 };
  53
  54 static int __init sh_pm_runtime_init(void)
  55 {
  56         pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
  57         return 0;
  58 }
  59 core_initcall(sh_pm_runtime_init);
  60
  61 static int __init sh_pm_runtime_late_init(void)
  62 {
  63         pm_genpd_poweroff_unused();
  64         return 0;
  65 }
  66 late_initcall(sh_pm_runtime_late_init);