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