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 <mach/pm-rmobile.h>
  14 #include <mach/common.h>
  15
  16 #ifdef CONFIG_PM
  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 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     = "A4S",
  38                 .bit_shift      = 10,
  39                 .gov            = &pm_domain_always_on_gov,
  40                 .no_debug       = true,
  41                 .suspend        = r8a7740_pd_a4s_suspend,
  42         },
  43         {
  44                 .genpd.name     = "A3SP",
  45                 .bit_shift      = 11,
  46                 .gov            = &pm_domain_always_on_gov,
  47                 .no_debug       = true,
  48                 .suspend        = r8a7740_pd_a3sp_suspend,
  49         },
  50         {
  51                 .genpd.name     = "A4LC",
  52                 .bit_shift      = 1,
  53         },
  54 };
  55
  56 void __init r8a7740_init_pm_domains(void)
  57 {
  58         rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
  59         pm_genpd_add_subdomain_names("A4S", "A3SP");
  60 }
  61
  62 #endif /* CONFIG_PM */
  63
  64 #ifdef CONFIG_SUSPEND
  65 static int r8a7740_enter_suspend(suspend_state_t suspend_state)
  66 {
  67         cpu_do_idle();
  68         return 0;
  69 }
  70
  71 static void r8a7740_suspend_init(void)
  72 {
  73         shmobile_suspend_ops.enter = r8a7740_enter_suspend;
  74 }
  75 #else
  76 static void r8a7740_suspend_init(void) {}
  77 #endif
  78
  79 void __init r8a7740_pm_init(void)
  80 {
  81         r8a7740_suspend_init();
  82 }