1/* linux/arch/arm/mach-s3c2412/pm.c
2 *
3 * Copyright (c) 2006 Simtec Electronics
4 *	Ben Dooks <ben@simtec.co.uk>
5 *
6 * http://armlinux.simtec.co.uk/.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11*/
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/interrupt.h>
16#include <linux/list.h>
17#include <linux/timer.h>
18#include <linux/init.h>
19#include <linux/device.h>
20#include <linux/syscore_ops.h>
21#include <linux/platform_device.h>
22#include <linux/io.h>
23
24#include <asm/cacheflush.h>
25#include <asm/irq.h>
26
27#include <mach/hardware.h>
28#include <mach/regs-gpio.h>
29
30#include <plat/cpu.h>
31#include <plat/pm.h>
32#include <plat/wakeup-mask.h>
33
34#include "regs-dsc.h"
35#include "s3c2412-power.h"
36
37extern void s3c2412_sleep_enter(void);
38
39static int s3c2412_cpu_suspend(unsigned long arg)
40{
41	unsigned long tmp;
42
43	/* set our standby method to sleep */
44
45	tmp = __raw_readl(S3C2412_PWRCFG);
46	tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
47	__raw_writel(tmp, S3C2412_PWRCFG);
48
49	s3c2412_sleep_enter();
50
51	pr_info("Failed to suspend the system\n");
52	return 1; /* Aborting suspend */
53}
54
55/* mapping of interrupts to parts of the wakeup mask */
56static struct samsung_wakeup_mask wake_irqs[] = {
57	{ .irq = IRQ_RTC,	.bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
58};
59
60static void s3c2412_pm_prepare(void)
61{
62	samsung_sync_wakemask(S3C2412_PWRCFG,
63			      wake_irqs, ARRAY_SIZE(wake_irqs));
64}
65
66static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
67{
68	pm_cpu_prep = s3c2412_pm_prepare;
69	pm_cpu_sleep = s3c2412_cpu_suspend;
70
71	return 0;
72}
73
74static struct sleep_save s3c2412_sleep[] = {
75	SAVE_ITEM(S3C2412_DSC0),
76	SAVE_ITEM(S3C2412_DSC1),
77	SAVE_ITEM(S3C2413_GPJDAT),
78	SAVE_ITEM(S3C2413_GPJCON),
79	SAVE_ITEM(S3C2413_GPJUP),
80
81	/* save the PWRCFG to get back to original sleep method */
82
83	SAVE_ITEM(S3C2412_PWRCFG),
84
85	/* save the sleep configuration anyway, just in case these
86	 * get damaged during wakeup */
87
88	SAVE_ITEM(S3C2412_GPBSLPCON),
89	SAVE_ITEM(S3C2412_GPCSLPCON),
90	SAVE_ITEM(S3C2412_GPDSLPCON),
91	SAVE_ITEM(S3C2412_GPFSLPCON),
92	SAVE_ITEM(S3C2412_GPGSLPCON),
93	SAVE_ITEM(S3C2412_GPHSLPCON),
94	SAVE_ITEM(S3C2413_GPJSLPCON),
95};
96
97static struct subsys_interface s3c2412_pm_interface = {
98	.name		= "s3c2412_pm",
99	.subsys		= &s3c2412_subsys,
100	.add_dev	= s3c2412_pm_add,
101};
102
103static __init int s3c2412_pm_init(void)
104{
105	return subsys_interface_register(&s3c2412_pm_interface);
106}
107
108arch_initcall(s3c2412_pm_init);
109
110static int s3c2412_pm_suspend(void)
111{
112	s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
113	return 0;
114}
115
116static void s3c2412_pm_resume(void)
117{
118	unsigned long tmp;
119
120	tmp = __raw_readl(S3C2412_PWRCFG);
121	tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
122	tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
123	__raw_writel(tmp, S3C2412_PWRCFG);
124
125	s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
126}
127
128struct syscore_ops s3c2412_pm_syscore_ops = {
129	.suspend	= s3c2412_pm_suspend,
130	.resume		= s3c2412_pm_resume,
131};
132