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 static int sh_pm_runtime_suspend(struct device *dev)
  25 {
  26         int ret;
  27
  28         ret = pm_generic_runtime_suspend(dev);
  29         if (ret) {
  30                 dev_err(dev, "failed to suspend device\n");
  31                 return ret;
  32         }
  33
  34         ret = pm_clk_suspend(dev);
  35         if (ret) {
  36                 dev_err(dev, "failed to suspend clock\n");
  37                 pm_generic_runtime_resume(dev);
  38                 return ret;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int sh_pm_runtime_resume(struct device *dev)
  45 {
  46         int ret;
  47
  48         ret = pm_clk_resume(dev);
  49         if (ret) {
  50                 dev_err(dev, "failed to resume clock\n");
  51                 return ret;
  52         }
  53
  54         return pm_generic_runtime_resume(dev);
  55 }
  56
  57 static struct dev_pm_domain default_pm_domain = {
  58         .ops = {
  59                 .runtime_suspend = sh_pm_runtime_suspend,
  60                 .runtime_resume = sh_pm_runtime_resume,
  61                 USE_PLATFORM_PM_SLEEP_OPS
  62         },
  63 };
  64
  65 #define DEFAULT_PM_DOMAIN_PTR   (&default_pm_domain)
  66
  67 #else
  68
  69 #define DEFAULT_PM_DOMAIN_PTR   NULL
  70
  71 #endif /* CONFIG_PM_RUNTIME */
  72
  73 static struct pm_clk_notifier_block platform_bus_notifier = {
  74         .pm_domain = DEFAULT_PM_DOMAIN_PTR,
  75         .con_ids = { NULL, },
  76 };
  77
  78 static bool default_pm_on;
  79
  80 static int __init sh_pm_runtime_init(void)
  81 {
  82         if (IS_ENABLED(CONFIG_ARCH_SHMOBILE_MULTI)) {
  83                 if (!of_machine_is_compatible("renesas,emev2") &&
  84                     !of_machine_is_compatible("renesas,r7s72100") &&
  85                     !of_machine_is_compatible("renesas,r8a73a4") &&
  86                     !of_machine_is_compatible("renesas,r8a7740") &&
  87                     !of_machine_is_compatible("renesas,r8a7778") &&
  88                     !of_machine_is_compatible("renesas,r8a7779") &&
  89                     !of_machine_is_compatible("renesas,r8a7790") &&
  90                     !of_machine_is_compatible("renesas,r8a7791") &&
  91                     !of_machine_is_compatible("renesas,r8a7792") &&
  92                     !of_machine_is_compatible("renesas,r8a7793") &&
  93                     !of_machine_is_compatible("renesas,r8a7794") &&
  94                     !of_machine_is_compatible("renesas,sh7372") &&
  95                     !of_machine_is_compatible("renesas,sh73a0"))
  96                         return 0;
  97         }
  98
  99         default_pm_on = true;
 100         pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
 101         return 0;
 102 }
 103 core_initcall(sh_pm_runtime_init);
 104
 105 static int __init sh_pm_runtime_late_init(void)
 106 {
 107         if (default_pm_on)
 108                 pm_genpd_poweroff_unused();
 109         return 0;
 110 }
 111 late_initcall(sh_pm_runtime_late_init);