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 } 168