kernel/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/io.h>
  13 #include <linux/suspend.h>
  14
  15 #include "common.h"
  16 #include "pm-rmobile.h"
  17
  18 #define SYSC_BASE       IOMEM(0xe6180000)
  19
  20 #if defined(CONFIG_PM) && !defined(CONFIG_ARCH_MULTIPLATFORM)
  21 static int r8a7740_pd_a3sm_suspend(void)
  22 {
  23         /*
  24          * The A3SM domain contains the CPU core and therefore it should
  25          * only be turned off if the CPU is not in use.
  26          */
  27         return -EBUSY;
  28 }
  29
  30 static int r8a7740_pd_a3sp_suspend(void)
  31 {
  32         /*
  33          * Serial consoles make use of SCIF hardware located in A3SP,
  34          * keep such power domain on if "no_console_suspend" is set.
  35          */
  36         return console_suspend_enabled ? 0 : -EBUSY;
  37 }
  38
  39 static int r8a7740_pd_d4_suspend(void)
  40 {
  41         /*
  42          * The D4 domain contains the Coresight-ETM hardware block and
  43          * therefore it should only be turned off if the debug module is
  44          * not in use.
  45          */
  46         return -EBUSY;
  47 }
  48
  49 static struct rmobile_pm_domain r8a7740_pm_domains[] = {
  50         {
  51                 .genpd.name     = "A4LC",
  52                 .base           = SYSC_BASE,
  53                 .bit_shift      = 1,
  54         }, {
  55                 .genpd.name     = "A4MP",
  56                 .base           = SYSC_BASE,
  57                 .bit_shift      = 2,
  58         }, {
  59                 .genpd.name     = "D4",
  60                 .base           = SYSC_BASE,
  61                 .bit_shift      = 3,
  62                 .gov            = &pm_domain_always_on_gov,
  63                 .suspend        = r8a7740_pd_d4_suspend,
  64         }, {
  65                 .genpd.name     = "A4R",
  66                 .base           = SYSC_BASE,
  67                 .bit_shift      = 5,
  68         }, {
  69                 .genpd.name     = "A3RV",
  70                 .base           = SYSC_BASE,
  71                 .bit_shift      = 6,
  72         }, {
  73                 .genpd.name     = "A4S",
  74                 .base           = SYSC_BASE,
  75                 .bit_shift      = 10,
  76                 .no_debug       = true,
  77         }, {
  78                 .genpd.name     = "A3SP",
  79                 .base           = SYSC_BASE,
  80                 .bit_shift      = 11,
  81                 .gov            = &pm_domain_always_on_gov,
  82                 .no_debug       = true,
  83                 .suspend        = r8a7740_pd_a3sp_suspend,
  84         }, {
  85                 .genpd.name     = "A3SM",
  86                 .base           = SYSC_BASE,
  87                 .bit_shift      = 12,
  88                 .gov            = &pm_domain_always_on_gov,
  89                 .suspend        = r8a7740_pd_a3sm_suspend,
  90         }, {
  91                 .genpd.name     = "A3SG",
  92                 .base           = SYSC_BASE,
  93                 .bit_shift      = 13,
  94         }, {
  95                 .genpd.name     = "A4SU",
  96                 .base           = SYSC_BASE,
  97                 .bit_shift      = 20,
  98         },
  99 };
 100
 101 void __init r8a7740_init_pm_domains(void)
 102 {
 103         rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
 104         pm_genpd_add_subdomain_names("A4R", "A3RV");
 105         pm_genpd_add_subdomain_names("A4S", "A3SP");
 106         pm_genpd_add_subdomain_names("A4S", "A3SM");
 107         pm_genpd_add_subdomain_names("A4S", "A3SG");
 108 }
 109 #endif /* CONFIG_PM && !CONFIG_ARCH_MULTIPLATFORM */
 110
 111 #ifdef CONFIG_SUSPEND
 112 static int r8a7740_enter_suspend(suspend_state_t suspend_state)
 113 {
 114         cpu_do_idle();
 115         return 0;
 116 }
 117
 118 static void r8a7740_suspend_init(void)
 119 {
 120         shmobile_suspend_ops.enter = r8a7740_enter_suspend;
 121 }
 122 #else
 123 static void r8a7740_suspend_init(void) {}
 124 #endif
 125
 126 void __init r8a7740_pm_init(void)
 127 {
 128         r8a7740_suspend_init();
 129 }