arch/arm/mach-shmobile/pm-r8a7779.c

   1 /*
   2  * r8a7779 Power management support
   3  *
   4  * Copyright (C) 2011  Renesas Solutions Corp.
   5  * Copyright (C) 2011  Magnus Damm
   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
  12 #include <linux/pm.h>
  13 #include <linux/suspend.h>
  14 #include <linux/err.h>
  15 #include <linux/pm_clock.h>
  16 #include <linux/pm_domain.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/delay.h>
  19 #include <linux/irq.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/console.h>
  22
  23 #include <asm/io.h>
  24
  25 #include "common.h"
  26 #include "pm-rcar.h"
  27 #include "r8a7779.h"
  28
  29 /* SYSC */
  30 #define SYSCIER 0x0c
  31 #define SYSCIMR 0x10
  32
  33 struct r8a7779_pm_domain {
  34         struct generic_pm_domain genpd;
  35         struct rcar_sysc_ch ch;
  36 };
  37
  38 static inline struct rcar_sysc_ch *to_r8a7779_ch(struct generic_pm_domain *d)
  39 {
  40         return &container_of(d, struct r8a7779_pm_domain, genpd)->ch;
  41 }
  42
  43 #if defined(CONFIG_PM) || defined(CONFIG_SMP)
  44
  45 static void __init r8a7779_sysc_init(void)
  46 {
  47         void __iomem *base = rcar_sysc_init(0xffd85000);
  48
  49         /* enable all interrupt sources, but do not use interrupt handler */
  50         iowrite32(0x0131000e, base + SYSCIER);
  51         iowrite32(0, base + SYSCIMR);
  52 }
  53
  54 #else /* CONFIG_PM || CONFIG_SMP */
  55
  56 static inline void r8a7779_sysc_init(void) {}
  57
  58 #endif /* CONFIG_PM || CONFIG_SMP */
  59
  60 #ifdef CONFIG_PM
  61
  62 static int pd_power_down(struct generic_pm_domain *genpd)
  63 {
  64         return rcar_sysc_power_down(to_r8a7779_ch(genpd));
  65 }
  66
  67 static int pd_power_up(struct generic_pm_domain *genpd)
  68 {
  69         return rcar_sysc_power_up(to_r8a7779_ch(genpd));
  70 }
  71
  72 static bool pd_is_off(struct generic_pm_domain *genpd)
  73 {
  74         return rcar_sysc_power_is_off(to_r8a7779_ch(genpd));
  75 }
  76
  77 static bool pd_active_wakeup(struct device *dev)
  78 {
  79         return true;
  80 }
  81
  82 static void r8a7779_init_pm_domain(struct r8a7779_pm_domain *r8a7779_pd)
  83 {
  84         struct generic_pm_domain *genpd = &r8a7779_pd->genpd;
  85
  86         genpd->flags = GENPD_FLAG_PM_CLK;
  87         pm_genpd_init(genpd, NULL, false);
  88         genpd->dev_ops.active_wakeup = pd_active_wakeup;
  89         genpd->power_off = pd_power_down;
  90         genpd->power_on = pd_power_up;
  91
  92         if (pd_is_off(&r8a7779_pd->genpd))
  93                 pd_power_up(&r8a7779_pd->genpd);
  94 }
  95
  96 static struct r8a7779_pm_domain r8a7779_pm_domains[] = {
  97         {
  98                 .genpd.name = "SH4A",
  99                 .ch = {
 100                         .chan_offs = 0x80, /* PWRSR1 .. PWRER1 */
 101                         .isr_bit = 16, /* SH4A */
 102                 },
 103         },
 104         {
 105                 .genpd.name = "SGX",
 106                 .ch = {
 107                         .chan_offs = 0xc0, /* PWRSR2 .. PWRER2 */
 108                         .isr_bit = 20, /* SGX */
 109                 },
 110         },
 111         {
 112                 .genpd.name = "VDP1",
 113                 .ch = {
 114                         .chan_offs = 0x100, /* PWRSR3 .. PWRER3 */
 115                         .isr_bit = 21, /* VDP */
 116                 },
 117         },
 118         {
 119                 .genpd.name = "IMPX3",
 120                 .ch = {
 121                         .chan_offs = 0x140, /* PWRSR4 .. PWRER4 */
 122                         .isr_bit = 24, /* IMP */
 123                 },
 124         },
 125 };
 126
 127 void __init r8a7779_init_pm_domains(void)
 128 {
 129         int j;
 130
 131         for (j = 0; j < ARRAY_SIZE(r8a7779_pm_domains); j++)
 132                 r8a7779_init_pm_domain(&r8a7779_pm_domains[j]);
 133 }
 134
 135 #endif /* CONFIG_PM */
 136
 137 void __init r8a7779_pm_init(void)
 138 {
 139         static int once;
 140
 141         if (!once++)
 142                 r8a7779_sysc_init();
 143 }