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