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         pm_genpd_init(genpd, NULL, false);
  87         genpd->dev_ops.stop = pm_clk_suspend;
  88         genpd->dev_ops.start = pm_clk_resume;
  89         genpd->dev_ops.active_wakeup = pd_active_wakeup;
  90         genpd->power_off = pd_power_down;
  91         genpd->power_on = pd_power_up;
  92
  93         if (pd_is_off(&r8a7779_pd->genpd))
  94                 pd_power_up(&r8a7779_pd->genpd);
  95 }
  96
  97 static struct r8a7779_pm_domain r8a7779_pm_domains[] = {
  98         {
  99                 .genpd.name = "SH4A",
 100                 .ch = {
 101                         .chan_offs = 0x80, /* PWRSR1 .. PWRER1 */
 102                         .isr_bit = 16, /* SH4A */
 103                 },
 104         },
 105         {
 106                 .genpd.name = "SGX",
 107                 .ch = {
 108                         .chan_offs = 0xc0, /* PWRSR2 .. PWRER2 */
 109                         .isr_bit = 20, /* SGX */
 110                 },
 111         },
 112         {
 113                 .genpd.name = "VDP1",
 114                 .ch = {
 115                         .chan_offs = 0x100, /* PWRSR3 .. PWRER3 */
 116                         .isr_bit = 21, /* VDP */
 117                 },
 118         },
 119         {
 120                 .genpd.name = "IMPX3",
 121                 .ch = {
 122                         .chan_offs = 0x140, /* PWRSR4 .. PWRER4 */
 123                         .isr_bit = 24, /* IMP */
 124                 },
 125         },
 126 };
 127
 128 void __init r8a7779_init_pm_domains(void)
 129 {
 130         int j;
 131
 132         for (j = 0; j < ARRAY_SIZE(r8a7779_pm_domains); j++)
 133                 r8a7779_init_pm_domain(&r8a7779_pm_domains[j]);
 134 }
 135
 136 #endif /* CONFIG_PM */
 137
 138 void __init r8a7779_pm_init(void)
 139 {
 140         static int once;
 141
 142         if (!once++)
 143                 r8a7779_sysc_init();
 144 }