blk: rq_data_dir() should not return a boolean
[cris-mirror.git] / arch / arm / mach-s5pv210 / pm.c
blob21b4b13c5ab787f0707c00c5125b285f73dcdd60
1 /* linux/arch/arm/mach-s5pv210/pm.c
3 * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
6 * S5PV210 - Power Management support
8 * Based on arch/arm/mach-s3c2410/pm.c
9 * Copyright (c) 2006 Simtec Electronics
10 * Ben Dooks <ben@simtec.co.uk>
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.
17 #include <linux/init.h>
18 #include <linux/suspend.h>
19 #include <linux/syscore_ops.h>
20 #include <linux/io.h>
22 #include <asm/cacheflush.h>
23 #include <asm/suspend.h>
25 #include <plat/pm-common.h>
27 #include "common.h"
28 #include "regs-clock.h"
30 static struct sleep_save s5pv210_core_save[] = {
31 /* Clock ETC */
32 SAVE_ITEM(S5P_MDNIE_SEL),
36 * VIC wake-up support (TODO)
38 static u32 s5pv210_irqwake_intmask = 0xffffffff;
41 * Suspend helpers.
43 static int s5pv210_cpu_suspend(unsigned long arg)
45 unsigned long tmp;
47 /* issue the standby signal into the pm unit. Note, we
48 * issue a write-buffer drain just in case */
50 tmp = 0;
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));
59 pr_info("Failed to suspend the system\n");
60 return 1; /* Aborting suspend */
63 static void s5pv210_pm_prepare(void)
65 unsigned int tmp;
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);
71 /* ensure at least INFORM0 has the resume address */
72 __raw_writel(virt_to_phys(s5pv210_cpu_resume), S5P_INFORM0);
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);
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);
84 /* SYSCON interrupt handling disable */
85 tmp = __raw_readl(S5P_OTHERS);
86 tmp |= S5P_OTHER_SYSC_INTOFF;
87 __raw_writel(tmp, S5P_OTHERS);
89 s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
93 * Suspend operations.
95 static int s5pv210_suspend_enter(suspend_state_t state)
97 int ret;
99 s3c_pm_debug_init();
101 S3C_PMDBG("%s: suspending the system...\n", __func__);
103 S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
104 s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
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;
113 s3c_pm_save_uarts();
114 s5pv210_pm_prepare();
115 flush_cache_all();
116 s3c_pm_check_store();
118 ret = cpu_suspend(0, s5pv210_cpu_suspend);
119 if (ret)
120 return ret;
122 s3c_pm_restore_uarts();
124 S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
125 __raw_readl(S5P_WAKEUP_STAT));
127 s3c_pm_check_restore();
129 S3C_PMDBG("%s: resuming the system...\n", __func__);
131 return 0;
134 static int s5pv210_suspend_prepare(void)
136 s3c_pm_check_prepare();
138 return 0;
141 static void s5pv210_suspend_finish(void)
143 s3c_pm_check_cleanup();
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,
154 * Syscore operations used to delay restore of certain registers.
156 static void s5pv210_pm_resume(void)
158 u32 tmp;
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);
165 s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
168 static struct syscore_ops s5pv210_pm_syscore_ops = {
169 .resume = s5pv210_pm_resume,
173 * Initialization entry point.
175 void __init s5pv210_pm_init(void)
177 register_syscore_ops(&s5pv210_pm_syscore_ops);
178 suspend_set_ops(&s5pv210_suspend_ops);