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 30 static 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 */ 38 static u32 s5pv210_irqwake_intmask = 0xffffffff; 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 /* 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 */ 95 static 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 } 133 134 static int s5pv210_suspend_prepare(void) 135 { 136 s3c_pm_check_prepare(); 137 138 return 0; 139 } 140 141 static void s5pv210_suspend_finish(void) 142 { 143 s3c_pm_check_cleanup(); 144 } 145 146 static 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 */ 156 static 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 } 167 168 static struct syscore_ops s5pv210_pm_syscore_ops = { 169 .resume = s5pv210_pm_resume, 170 }; 171 172 /* 173 * Initialization entry point. 174 */ 175 void __init s5pv210_pm_init(void) 176 { 177 register_syscore_ops(&s5pv210_pm_syscore_ops); 178 suspend_set_ops(&s5pv210_suspend_ops); 179 } 180