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 <mach/regs-clock.h> 28 29 #include "common.h" 30 31 static struct sleep_save s5pv210_core_save[] = { 32 /* Clock ETC */ 33 SAVE_ITEM(S5P_MDNIE_SEL), 34 }; 35 36 /* 37 * VIC wake-up support (TODO) 38 */ 39 static u32 s5pv210_irqwake_intmask = 0xffffffff; 40 41 /* 42 * Suspend helpers. 43 */ 44 static int s5pv210_cpu_suspend(unsigned long arg) 45 { 46 unsigned long tmp; 47 48 /* issue the standby signal into the pm unit. Note, we 49 * issue a write-buffer drain just in case */ 50 51 tmp = 0; 52 53 asm("b 1f\n\t" 54 ".align 5\n\t" 55 "1:\n\t" 56 "mcr p15, 0, %0, c7, c10, 5\n\t" 57 "mcr p15, 0, %0, c7, c10, 4\n\t" 58 "wfi" : : "r" (tmp)); 59 60 pr_info("Failed to suspend the system\n"); 61 return 1; /* Aborting suspend */ 62 } 63 64 static void s5pv210_pm_prepare(void) 65 { 66 unsigned int tmp; 67 68 /* Set wake-up mask registers */ 69 __raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK); 70 __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK); 71 72 /* ensure at least INFORM0 has the resume address */ 73 __raw_writel(virt_to_phys(s5pv210_cpu_resume), S5P_INFORM0); 74 75 tmp = __raw_readl(S5P_SLEEP_CFG); 76 tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN); 77 __raw_writel(tmp, S5P_SLEEP_CFG); 78 79 /* WFI for SLEEP mode configuration by SYSCON */ 80 tmp = __raw_readl(S5P_PWR_CFG); 81 tmp &= S5P_CFG_WFI_CLEAN; 82 tmp |= S5P_CFG_WFI_SLEEP; 83 __raw_writel(tmp, S5P_PWR_CFG); 84 85 /* SYSCON interrupt handling disable */ 86 tmp = __raw_readl(S5P_OTHERS); 87 tmp |= S5P_OTHER_SYSC_INTOFF; 88 __raw_writel(tmp, S5P_OTHERS); 89 90 s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save)); 91 } 92 93 /* 94 * Suspend operations. 95 */ 96 static int s5pv210_suspend_enter(suspend_state_t state) 97 { 98 int ret; 99 100 s3c_pm_debug_init(); 101 102 S3C_PMDBG("%s: suspending the system...\n", __func__); 103 104 S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__, 105 s5pv210_irqwake_intmask, exynos_get_eint_wake_mask()); 106 107 if (s5pv210_irqwake_intmask == -1U 108 && exynos_get_eint_wake_mask() == -1U) { 109 pr_err("%s: No wake-up sources!\n", __func__); 110 pr_err("%s: Aborting sleep\n", __func__); 111 return -EINVAL; 112 } 113 114 s3c_pm_save_uarts(); 115 s5pv210_pm_prepare(); 116 flush_cache_all(); 117 s3c_pm_check_store(); 118 119 ret = cpu_suspend(0, s5pv210_cpu_suspend); 120 if (ret) 121 return ret; 122 123 s3c_pm_restore_uarts(); 124 125 S3C_PMDBG("%s: wakeup stat: %08x\n", __func__, 126 __raw_readl(S5P_WAKEUP_STAT)); 127 128 s3c_pm_check_restore(); 129 130 S3C_PMDBG("%s: resuming the system...\n", __func__); 131 132 return 0; 133 } 134 135 static int s5pv210_suspend_prepare(void) 136 { 137 s3c_pm_check_prepare(); 138 139 return 0; 140 } 141 142 static void s5pv210_suspend_finish(void) 143 { 144 s3c_pm_check_cleanup(); 145 } 146 147 static const struct platform_suspend_ops s5pv210_suspend_ops = { 148 .enter = s5pv210_suspend_enter, 149 .prepare = s5pv210_suspend_prepare, 150 .finish = s5pv210_suspend_finish, 151 .valid = suspend_valid_only_mem, 152 }; 153 154 /* 155 * Syscore operations used to delay restore of certain registers. 156 */ 157 static void s5pv210_pm_resume(void) 158 { 159 u32 tmp; 160 161 tmp = __raw_readl(S5P_OTHERS); 162 tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\ 163 S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART); 164 __raw_writel(tmp , S5P_OTHERS); 165 166 s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save)); 167 } 168 169 static struct syscore_ops s5pv210_pm_syscore_ops = { 170 .resume = s5pv210_pm_resume, 171 }; 172 173 /* 174 * Initialization entry point. 175 */ 176 void __init s5pv210_pm_init(void) 177 { 178 register_syscore_ops(&s5pv210_pm_syscore_ops); 179 suspend_set_ops(&s5pv210_suspend_ops); 180 } 181