arch/arm/mach-prima2/pm.c

   1 /*
   2  * power management entry for CSR SiRFprimaII
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/suspend.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <linux/of.h>
  14 #include <linux/of_address.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/io.h>
  18 #include <linux/rtc/sirfsoc_rtciobrg.h>
  19 #include <asm/outercache.h>
  20 #include <asm/suspend.h>
  21 #include <asm/hardware/cache-l2x0.h>
  22
  23 #include "pm.h"
  24
  25 /*
  26  * suspend asm codes will access these to make DRAM become self-refresh and
  27  * system sleep
  28  */
  29 u32 sirfsoc_pwrc_base;
  30 void __iomem *sirfsoc_memc_base;
  31
  32 static void sirfsoc_set_wakeup_source(void)
  33 {
  34         u32 pwr_trigger_en_reg;
  35         pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
  36                 SIRFSOC_PWRC_TRIGGER_EN);
  37 #define X_ON_KEY_B (1 << 0)
  38 #define RTC_ALARM0_B (1 << 2)
  39 #define RTC_ALARM1_B (1 << 3)
  40         sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B |
  41                 RTC_ALARM0_B | RTC_ALARM1_B,
  42                 sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
  43 }
  44
  45 static void sirfsoc_set_sleep_mode(u32 mode)
  46 {
  47         u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
  48                 SIRFSOC_PWRC_PDN_CTRL);
  49         sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
  50         sleep_mode |= mode << 1;
  51         sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
  52                 SIRFSOC_PWRC_PDN_CTRL);
  53 }
  54
  55 static int sirfsoc_pre_suspend_power_off(void)
  56 {
  57         u32 wakeup_entry = __pa_symbol(cpu_resume);
  58
  59         sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
  60                 SIRFSOC_PWRC_SCRATCH_PAD1);
  61
  62         sirfsoc_set_wakeup_source();
  63
  64         sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);
  65
  66         return 0;
  67 }
  68
  69 static int sirfsoc_pm_enter(suspend_state_t state)
  70 {
  71         switch (state) {
  72         case PM_SUSPEND_MEM:
  73                 sirfsoc_pre_suspend_power_off();
  74
  75                 outer_disable();
  76                 /* go zzz */
  77                 cpu_suspend(0, sirfsoc_finish_suspend);
  78                 outer_resume();
  79                 break;
  80         default:
  81                 return -EINVAL;
  82         }
  83         return 0;
  84 }
  85
  86 static const struct platform_suspend_ops sirfsoc_pm_ops = {
  87         .enter = sirfsoc_pm_enter,
  88         .valid = suspend_valid_only_mem,
  89 };
  90
  91 static const struct of_device_id pwrc_ids[] = {
  92         { .compatible = "sirf,prima2-pwrc" },
  93         {}
  94 };
  95
  96 static int __init sirfsoc_of_pwrc_init(void)
  97 {
  98         struct device_node *np;
  99
 100         np = of_find_matching_node(NULL, pwrc_ids);
 101         if (!np) {
 102                 pr_err("unable to find compatible sirf pwrc node in dtb\n");
 103                 return -ENOENT;
 104         }
 105
 106         /*
 107          * pwrc behind rtciobrg is not located in memory space
 108          * though the property is named reg. reg only means base
 109          * offset for pwrc. then of_iomap is not suitable here.
 110          */
 111         if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
 112                 panic("unable to find base address of pwrc node in dtb\n");
 113
 114         of_node_put(np);
 115
 116         return 0;
 117 }
 118
 119 static const struct of_device_id memc_ids[] = {
 120         { .compatible = "sirf,prima2-memc" },
 121         {}
 122 };
 123
 124 static int sirfsoc_memc_probe(struct platform_device *op)
 125 {
 126         struct device_node *np = op->dev.of_node;
 127
 128         sirfsoc_memc_base = of_iomap(np, 0);
 129         if (!sirfsoc_memc_base)
 130                 panic("unable to map memc registers\n");
 131
 132         return 0;
 133 }
 134
 135 static struct platform_driver sirfsoc_memc_driver = {
 136         .probe          = sirfsoc_memc_probe,
 137         .driver = {
 138                 .name = "sirfsoc-memc",
 139                 .of_match_table = memc_ids,
 140         },
 141 };
 142
 143 static int __init sirfsoc_memc_init(void)
 144 {
 145         return platform_driver_register(&sirfsoc_memc_driver);
 146 }
 147
 148 int __init sirfsoc_pm_init(void)
 149 {
 150         sirfsoc_of_pwrc_init();
 151         sirfsoc_memc_init();
 152         suspend_set_ops(&sirfsoc_pm_ops);
 153         return 0;
 154 }