drivers/sh/pm_runtime.c

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