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 } 176