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_a3sm_suspend(void)
  18 {
  19         /*
  20          * The A3SM 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 int r8a7740_pd_d4_suspend(void)
  36 {
  37         /*
  38          * The D4 domain contains the Coresight-ETM hardware block and
  39          * therefore it should only be turned off if the debug module is
  40          * not in use.
  41          */
  42         return -EBUSY;
  43 }
  44
  45 static struct rmobile_pm_domain r8a7740_pm_domains[] = {
  46         {
  47                 .genpd.name     = "A4LC",
  48                 .bit_shift      = 1,
  49         }, {
  50                 .genpd.name     = "A4MP",
  51                 .bit_shift      = 2,
  52         }, {
  53                 .genpd.name     = "D4",
  54                 .bit_shift      = 3,
  55                 .gov            = &pm_domain_always_on_gov,
  56                 .suspend        = r8a7740_pd_d4_suspend,
  57         }, {
  58                 .genpd.name     = "A4R",
  59                 .bit_shift      = 5,
  60         }, {
  61                 .genpd.name     = "A3RV",
  62                 .bit_shift      = 6,
  63         }, {
  64                 .genpd.name     = "A4S",
  65                 .bit_shift      = 10,
  66                 .no_debug       = true,
  67         }, {
  68                 .genpd.name     = "A3SP",
  69                 .bit_shift      = 11,
  70                 .gov            = &pm_domain_always_on_gov,
  71                 .no_debug       = true,
  72                 .suspend        = r8a7740_pd_a3sp_suspend,
  73         }, {
  74                 .genpd.name     = "A3SM",
  75                 .bit_shift      = 12,
  76                 .gov            = &pm_domain_always_on_gov,
  77                 .suspend        = r8a7740_pd_a3sm_suspend,
  78         }, {
  79                 .genpd.name     = "A3SG",
  80                 .bit_shift      = 13,
  81         }, {
  82                 .genpd.name     = "A4SU",
  83                 .bit_shift      = 20,
  84         },
  85 };
  86
  87 void __init r8a7740_init_pm_domains(void)
  88 {
  89         rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
  90         pm_genpd_add_subdomain_names("A4R", "A3RV");
  91         pm_genpd_add_subdomain_names("A4S", "A3SP");
  92         pm_genpd_add_subdomain_names("A4S", "A3SM");
  93         pm_genpd_add_subdomain_names("A4S", "A3SG");
  94 }
  95 #endif /* CONFIG_PM && !CONFIG_ARCH_MULTIPLATFORM */
  96
  97 #ifdef CONFIG_SUSPEND
  98 static int r8a7740_enter_suspend(suspend_state_t suspend_state)
  99 {
 100         cpu_do_idle();
 101         return 0;
 102 }
 103
 104 static void r8a7740_suspend_init(void)
 105 {
 106         shmobile_suspend_ops.enter = r8a7740_enter_suspend;
 107 }
 108 #else
 109 static void r8a7740_suspend_init(void) {}
 110 #endif
 111
 112 void __init r8a7740_pm_init(void)
 113 {
 114         r8a7740_suspend_init();
 115 }