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
30static 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 */
38static u32 s5pv210_irqwake_intmask = 0xffffffff;
39
40/*
41 * Suspend helpers.
42 */
43static 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
63static 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 */
95static 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
134static int s5pv210_suspend_prepare(void)
135{
136	s3c_pm_check_prepare();
137
138	return 0;
139}
140
141static void s5pv210_suspend_finish(void)
142{
143	s3c_pm_check_cleanup();
144}
145
146static 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 */
156static 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
168static struct syscore_ops s5pv210_pm_syscore_ops = {
169	.resume		= s5pv210_pm_resume,
170};
171
172/*
173 * Initialization entry point.
174 */
175void __init s5pv210_pm_init(void)
176{
177	register_syscore_ops(&s5pv210_pm_syscore_ops);
178	suspend_set_ops(&s5pv210_suspend_ops);
179}
180