arch/arm/mach-shmobile/pm-r8a7740.c

   1 /*
   2  * r8a7740 power management support
   3  *
   4  * Copyright (C) 2012  Renesas Solutions Corp.
   5  * Copyright (C) 2012  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/console.h>
  12 #include <linux/suspend.h>
  13 #include "common.h"
  14 #include "pm-rmobile.h"
  15
  16 #if defined(CONFIG_PM) && !defined(CONFIG_ARCH_MULTIPLATFORM)
  17 static int r8a7740_pd_a4s_suspend(void)
  18 {
  19         /*
  20          * The A4S domain contains the CPU core and therefore it should
  21          * only be turned off if the CPU is not in use.
  22          */
  23         return -EBUSY;
  24 }
  25
  26 static int r8a7740_pd_a3sp_suspend(void)
  27 {
  28         /*
  29          * Serial consoles make use of SCIF hardware located in A3SP,
  30          * keep such power domain on if "no_console_suspend" is set.
  31          */
  32         return console_suspend_enabled ? 0 : -EBUSY;
  33 }
  34
  35 static struct rmobile_pm_domain r8a7740_pm_domains[] = {
  36         {
  37                 .genpd.name     = "A4LC",
  38                 .bit_shift      = 1,
  39         }, {
  40                 .genpd.name     = "A4S",
  41                 .bit_shift      = 10,
  42                 .gov            = &pm_domain_always_on_gov,
  43                 .no_debug       = true,
  44                 .suspend        = r8a7740_pd_a4s_suspend,
  45         }, {
  46                 .genpd.name     = "A3SP",
  47                 .bit_shift      = 11,
  48                 .gov            = &pm_domain_always_on_gov,
  49                 .no_debug       = true,
  50                 .suspend        = r8a7740_pd_a3sp_suspend,
  51         },
  52 };
  53
  54 void __init r8a7740_init_pm_domains(void)
  55 {
  56         rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
  57         pm_genpd_add_subdomain_names("A4S", "A3SP");
  58 }
  59 #endif /* CONFIG_PM && !CONFIG_ARCH_MULTIPLATFORM */
  60
  61 #ifdef CONFIG_SUSPEND
  62 static int r8a7740_enter_suspend(suspend_state_t suspend_state)
  63 {
  64         cpu_do_idle();
  65         return 0;
  66 }
  67
  68 static void r8a7740_suspend_init(void)
  69 {
  70         shmobile_suspend_ops.enter = r8a7740_enter_suspend;
  71 }
  72 #else
  73 static void r8a7740_suspend_init(void) {}
  74 #endif
  75
  76 void __init r8a7740_pm_init(void)
  77 {
  78         r8a7740_suspend_init();
  79 }