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