arch/arm/mach-s5pv210/pm.c

   1 // SPDX-License-Identifier: GPL-2.0
   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 #include <linux/init.h>
  13 #include <linux/suspend.h>
  14 #include <linux/syscore_ops.h>
  15 #include <linux/io.h>
  16
  17 #include <asm/cacheflush.h>
  18 #include <asm/suspend.h>
  19
  20 #include <plat/pm-common.h>
  21
  22 #include "common.h"
  23 #include "regs-clock.h"
  24
  25 static struct sleep_save s5pv210_core_save[] = {
  26         /* Clock ETC */
  27         SAVE_ITEM(S5P_MDNIE_SEL),
  28 };
  29
  30 /*
  31  * VIC wake-up support (TODO)
  32  */
  33 static u32 s5pv210_irqwake_intmask = 0xffffffff;
  34
  35 /*
  36  * Suspend helpers.
  37  */
  38 static int s5pv210_cpu_suspend(unsigned long arg)
  39 {
  40         unsigned long tmp;
  41
  42         /* issue the standby signal into the pm unit. Note, we
  43          * issue a write-buffer drain just in case */
  44
  45         tmp = 0;
  46
  47         asm("b 1f\n\t"
  48             ".align 5\n\t"
  49             "1:\n\t"
  50             "mcr p15, 0, %0, c7, c10, 5\n\t"
  51             "mcr p15, 0, %0, c7, c10, 4\n\t"
  52             "wfi" : : "r" (tmp));
  53
  54         pr_info("Failed to suspend the system\n");
  55         return 1; /* Aborting suspend */
  56 }
  57
  58 static void s5pv210_pm_prepare(void)
  59 {
  60         unsigned int tmp;
  61
  62         /* Set wake-up mask registers */
  63         __raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
  64         __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
  65
  66         /* ensure at least INFORM0 has the resume address */
  67         __raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
  68
  69         tmp = __raw_readl(S5P_SLEEP_CFG);
  70         tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
  71         __raw_writel(tmp, S5P_SLEEP_CFG);
  72
  73         /* WFI for SLEEP mode configuration by SYSCON */
  74         tmp = __raw_readl(S5P_PWR_CFG);
  75         tmp &= S5P_CFG_WFI_CLEAN;
  76         tmp |= S5P_CFG_WFI_SLEEP;
  77         __raw_writel(tmp, S5P_PWR_CFG);
  78
  79         /* SYSCON interrupt handling disable */
  80         tmp = __raw_readl(S5P_OTHERS);
  81         tmp |= S5P_OTHER_SYSC_INTOFF;
  82         __raw_writel(tmp, S5P_OTHERS);
  83
  84         s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
  85 }
  86
  87 /*
  88  * Suspend operations.
  89  */
  90 static int s5pv210_suspend_enter(suspend_state_t state)
  91 {
  92         int ret;
  93
  94         s3c_pm_debug_init();
  95
  96         S3C_PMDBG("%s: suspending the system...\n", __func__);
  97
  98         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
  99                         s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
 100
 101         if (s5pv210_irqwake_intmask == -1U
 102             && exynos_get_eint_wake_mask() == -1U) {
 103                 pr_err("%s: No wake-up sources!\n", __func__);
 104                 pr_err("%s: Aborting sleep\n", __func__);
 105                 return -EINVAL;
 106         }
 107
 108         s3c_pm_save_uarts();
 109         s5pv210_pm_prepare();
 110         flush_cache_all();
 111         s3c_pm_check_store();
 112
 113         ret = cpu_suspend(0, s5pv210_cpu_suspend);
 114         if (ret)
 115                 return ret;
 116
 117         s3c_pm_restore_uarts();
 118
 119         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 120                         __raw_readl(S5P_WAKEUP_STAT));
 121
 122         s3c_pm_check_restore();
 123
 124         S3C_PMDBG("%s: resuming the system...\n", __func__);
 125
 126         return 0;
 127 }
 128
 129 static int s5pv210_suspend_prepare(void)
 130 {
 131         s3c_pm_check_prepare();
 132
 133         return 0;
 134 }
 135
 136 static void s5pv210_suspend_finish(void)
 137 {
 138         s3c_pm_check_cleanup();
 139 }
 140
 141 static const struct platform_suspend_ops s5pv210_suspend_ops = {
 142         .enter          = s5pv210_suspend_enter,
 143         .prepare        = s5pv210_suspend_prepare,
 144         .finish         = s5pv210_suspend_finish,
 145         .valid          = suspend_valid_only_mem,
 146 };
 147
 148 /*
 149  * Syscore operations used to delay restore of certain registers.
 150  */
 151 static void s5pv210_pm_resume(void)
 152 {
 153         s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
 154 }
 155
 156 static struct syscore_ops s5pv210_pm_syscore_ops = {
 157         .resume         = s5pv210_pm_resume,
 158 };
 159
 160 /*
 161  * Initialization entry point.
 162  */
 163 void __init s5pv210_pm_init(void)
 164 {
 165         register_syscore_ops(&s5pv210_pm_syscore_ops);
 166         suspend_set_ops(&s5pv210_suspend_ops);
 167 }