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 static u32 s5pv210_read_eint_wakeup_mask(void)
  36 {
  37         return __raw_readl(S5P_EINT_WAKEUP_MASK);
  38 }
  39
  40 /*
  41  * Suspend helpers.
  42  */
  43 static 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
  63 static void s5pv210_pm_prepare(void)
  64 {
  65         unsigned int tmp;
  66
  67         /*
  68          * Set wake-up mask registers
  69          * S5P_EINT_WAKEUP_MASK is set by pinctrl driver in late suspend.
  70          */
  71         __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
  72
  73         /* ensure at least INFORM0 has the resume address */
  74         __raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
  75
  76         tmp = __raw_readl(S5P_SLEEP_CFG);
  77         tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
  78         __raw_writel(tmp, S5P_SLEEP_CFG);
  79
  80         /* WFI for SLEEP mode configuration by SYSCON */
  81         tmp = __raw_readl(S5P_PWR_CFG);
  82         tmp &= S5P_CFG_WFI_CLEAN;
  83         tmp |= S5P_CFG_WFI_SLEEP;
  84         __raw_writel(tmp, S5P_PWR_CFG);
  85
  86         /* SYSCON interrupt handling disable */
  87         tmp = __raw_readl(S5P_OTHERS);
  88         tmp |= S5P_OTHER_SYSC_INTOFF;
  89         __raw_writel(tmp, S5P_OTHERS);
  90
  91         s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
  92 }
  93
  94 /*
  95  * Suspend operations.
  96  */
  97 static int s5pv210_suspend_enter(suspend_state_t state)
  98 {
  99         u32 eint_wakeup_mask = s5pv210_read_eint_wakeup_mask();
 100         int ret;
 101
 102         s3c_pm_debug_init();
 103
 104         S3C_PMDBG("%s: suspending the system...\n", __func__);
 105
 106         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 107                         s5pv210_irqwake_intmask, eint_wakeup_mask);
 108
 109         if (s5pv210_irqwake_intmask == -1U
 110             && eint_wakeup_mask == -1U) {
 111                 pr_err("%s: No wake-up sources!\n", __func__);
 112                 pr_err("%s: Aborting sleep\n", __func__);
 113                 return -EINVAL;
 114         }
 115
 116         s3c_pm_save_uarts();
 117         s5pv210_pm_prepare();
 118         flush_cache_all();
 119         s3c_pm_check_store();
 120
 121         ret = cpu_suspend(0, s5pv210_cpu_suspend);
 122         if (ret)
 123                 return ret;
 124
 125         s3c_pm_restore_uarts();
 126
 127         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 128                         __raw_readl(S5P_WAKEUP_STAT));
 129
 130         s3c_pm_check_restore();
 131
 132         S3C_PMDBG("%s: resuming the system...\n", __func__);
 133
 134         return 0;
 135 }
 136
 137 static int s5pv210_suspend_prepare(void)
 138 {
 139         s3c_pm_check_prepare();
 140
 141         return 0;
 142 }
 143
 144 static void s5pv210_suspend_finish(void)
 145 {
 146         s3c_pm_check_cleanup();
 147 }
 148
 149 static const struct platform_suspend_ops s5pv210_suspend_ops = {
 150         .enter          = s5pv210_suspend_enter,
 151         .prepare        = s5pv210_suspend_prepare,
 152         .finish         = s5pv210_suspend_finish,
 153         .valid          = suspend_valid_only_mem,
 154 };
 155
 156 /*
 157  * Syscore operations used to delay restore of certain registers.
 158  */
 159 static void s5pv210_pm_resume(void)
 160 {
 161         s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
 162 }
 163
 164 static struct syscore_ops s5pv210_pm_syscore_ops = {
 165         .resume         = s5pv210_pm_resume,
 166 };
 167
 168 /*
 169  * Initialization entry point.
 170  */
 171 void __init s5pv210_pm_init(void)
 172 {
 173         register_syscore_ops(&s5pv210_pm_syscore_ops);
 174         suspend_set_ops(&s5pv210_suspend_ops);
 175 }