arch/arm/mach-s5pv210/pm.c

   1 /* linux/arch/arm/mach-s5pv210/pm.c
   2  *
   3  * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5PV210 - Power Management support
   7  *
   8  * Based on arch/arm/mach-s3c2410/pm.c
   9  * Copyright (c) 2006 Simtec Electronics
  10  *      Ben Dooks <ben@simtec.co.uk>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15 */
  16
  17 #include <linux/init.h>
  18 #include <linux/suspend.h>
  19 #include <linux/syscore_ops.h>
  20 #include <linux/io.h>
  21
  22 #include <asm/cacheflush.h>
  23 #include <asm/suspend.h>
  24
  25 #include <plat/pm-common.h>
  26
  27 #include <mach/regs-clock.h>
  28
  29 #include "common.h"
  30
  31 static struct sleep_save s5pv210_core_save[] = {
  32         /* Clock ETC */
  33         SAVE_ITEM(S5P_MDNIE_SEL),
  34 };
  35
  36 /*
  37  * VIC wake-up support (TODO)
  38  */
  39 static u32 s5pv210_irqwake_intmask = 0xffffffff;
  40
  41 /*
  42  * Suspend helpers.
  43  */
  44 static int s5pv210_cpu_suspend(unsigned long arg)
  45 {
  46         unsigned long tmp;
  47
  48         /* issue the standby signal into the pm unit. Note, we
  49          * issue a write-buffer drain just in case */
  50
  51         tmp = 0;
  52
  53         asm("b 1f\n\t"
  54             ".align 5\n\t"
  55             "1:\n\t"
  56             "mcr p15, 0, %0, c7, c10, 5\n\t"
  57             "mcr p15, 0, %0, c7, c10, 4\n\t"
  58             "wfi" : : "r" (tmp));
  59
  60         pr_info("Failed to suspend the system\n");
  61         return 1; /* Aborting suspend */
  62 }
  63
  64 static void s5pv210_pm_prepare(void)
  65 {
  66         unsigned int tmp;
  67
  68         /* Set wake-up mask registers */
  69         __raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
  70         __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
  71
  72         /* ensure at least INFORM0 has the resume address */
  73         __raw_writel(virt_to_phys(s5pv210_cpu_resume), S5P_INFORM0);
  74
  75         tmp = __raw_readl(S5P_SLEEP_CFG);
  76         tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
  77         __raw_writel(tmp, S5P_SLEEP_CFG);
  78
  79         /* WFI for SLEEP mode configuration by SYSCON */
  80         tmp = __raw_readl(S5P_PWR_CFG);
  81         tmp &= S5P_CFG_WFI_CLEAN;
  82         tmp |= S5P_CFG_WFI_SLEEP;
  83         __raw_writel(tmp, S5P_PWR_CFG);
  84
  85         /* SYSCON interrupt handling disable */
  86         tmp = __raw_readl(S5P_OTHERS);
  87         tmp |= S5P_OTHER_SYSC_INTOFF;
  88         __raw_writel(tmp, S5P_OTHERS);
  89
  90         s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
  91 }
  92
  93 /*
  94  * Suspend operations.
  95  */
  96 static int s5pv210_suspend_enter(suspend_state_t state)
  97 {
  98         int ret;
  99
 100         s3c_pm_debug_init();
 101
 102         S3C_PMDBG("%s: suspending the system...\n", __func__);
 103
 104         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 105                         s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
 106
 107         if (s5pv210_irqwake_intmask == -1U
 108             && exynos_get_eint_wake_mask() == -1U) {
 109                 pr_err("%s: No wake-up sources!\n", __func__);
 110                 pr_err("%s: Aborting sleep\n", __func__);
 111                 return -EINVAL;
 112         }
 113
 114         s3c_pm_save_uarts();
 115         s5pv210_pm_prepare();
 116         flush_cache_all();
 117         s3c_pm_check_store();
 118
 119         ret = cpu_suspend(0, s5pv210_cpu_suspend);
 120         if (ret)
 121                 return ret;
 122
 123         s3c_pm_restore_uarts();
 124
 125         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 126                         __raw_readl(S5P_WAKEUP_STAT));
 127
 128         s3c_pm_check_restore();
 129
 130         S3C_PMDBG("%s: resuming the system...\n", __func__);
 131
 132         return 0;
 133 }
 134
 135 static int s5pv210_suspend_prepare(void)
 136 {
 137         s3c_pm_check_prepare();
 138
 139         return 0;
 140 }
 141
 142 static void s5pv210_suspend_finish(void)
 143 {
 144         s3c_pm_check_cleanup();
 145 }
 146
 147 static const struct platform_suspend_ops s5pv210_suspend_ops = {
 148         .enter          = s5pv210_suspend_enter,
 149         .prepare        = s5pv210_suspend_prepare,
 150         .finish         = s5pv210_suspend_finish,
 151         .valid          = suspend_valid_only_mem,
 152 };
 153
 154 /*
 155  * Syscore operations used to delay restore of certain registers.
 156  */
 157 static void s5pv210_pm_resume(void)
 158 {
 159         u32 tmp;
 160
 161         tmp = __raw_readl(S5P_OTHERS);
 162         tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\
 163                 S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART);
 164         __raw_writel(tmp , S5P_OTHERS);
 165
 166         s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
 167 }
 168
 169 static struct syscore_ops s5pv210_pm_syscore_ops = {
 170         .resume         = s5pv210_pm_resume,
 171 };
 172
 173 /*
 174  * Initialization entry point.
 175  */
 176 void __init s5pv210_pm_init(void)
 177 {
 178         register_syscore_ops(&s5pv210_pm_syscore_ops);
 179         suspend_set_ops(&s5pv210_suspend_ops);
 180 }