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 <mach/pm-rmobile.h>
  13
  14 #ifdef CONFIG_PM
  15 static int r8a7740_pd_a4s_suspend(void)
  16 {
  17         /*
  18          * The A4S domain contains the CPU core and therefore it should
  19          * only be turned off if the CPU is in use.
  20          */
  21         return -EBUSY;
  22 }
  23
  24 static int r8a7740_pd_a3sp_suspend(void)
  25 {
  26         /*
  27          * Serial consoles make use of SCIF hardware located in A3SP,
  28          * keep such power domain on if "no_console_suspend" is set.
  29          */
  30         return console_suspend_enabled ? 0 : -EBUSY;
  31 }
  32
  33 static struct rmobile_pm_domain r8a7740_pm_domains[] = {
  34         {
  35                 .genpd.name     = "A4S",
  36                 .bit_shift      = 10,
  37                 .gov            = &pm_domain_always_on_gov,
  38                 .no_debug       = true,
  39                 .suspend        = r8a7740_pd_a4s_suspend,
  40         },
  41         {
  42                 .genpd.name     = "A3SP",
  43                 .bit_shift      = 11,
  44                 .gov            = &pm_domain_always_on_gov,
  45                 .no_debug       = true,
  46                 .suspend        = r8a7740_pd_a3sp_suspend,
  47         },
  48         {
  49                 .genpd.name     = "A4LC",
  50                 .bit_shift      = 1,
  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
  60 #endif /* CONFIG_PM */