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/sysdev.h>
20#include <linux/platform_device.h>
21
22#include <asm/hardware.h>
23#include <asm/io.h>
24#include <asm/irq.h>
25
26#include <asm/arch/regs-power.h>
27#include <asm/arch/regs-gpioj.h>
28#include <asm/arch/regs-gpio.h>
29#include <asm/arch/regs-dsc.h>
30
31#include <asm/plat-s3c24xx/cpu.h>
32#include <asm/plat-s3c24xx/pm.h>
33
34#include <asm/plat-s3c24xx/s3c2412.h>
35
36static void s3c2412_cpu_suspend(void)
37{
38	unsigned long tmp;
39
40	/* set our standby method to sleep */
41
42	tmp = __raw_readl(S3C2412_PWRCFG);
43	tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
44	__raw_writel(tmp, S3C2412_PWRCFG);
45
46	/* issue the standby signal into the pm unit. Note, we
47	 * issue a write-buffer drain just in case */
48
49	tmp = 0;
50
51	asm("b 1f\n\t"
52	    ".align 5\n\t"
53	    "1:\n\t"
54	    "mcr p15, 0, %0, c7, c10, 4\n\t"
55	    "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
56
57	/* we should never get past here */
58
59	panic("sleep resumed to originator?");
60}
61
62static void s3c2412_pm_prepare(void)
63{
64}
65
66static int s3c2412_pm_add(struct sys_device *sysdev)
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_GPESLPCON),
92	SAVE_ITEM(S3C2412_GPFSLPCON),
93	SAVE_ITEM(S3C2412_GPGSLPCON),
94	SAVE_ITEM(S3C2412_GPHSLPCON),
95	SAVE_ITEM(S3C2413_GPJSLPCON),
96};
97
98static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
99{
100	s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
101	return 0;
102}
103
104static int s3c2412_pm_resume(struct sys_device *dev)
105{
106	unsigned long tmp;
107
108	tmp = __raw_readl(S3C2412_PWRCFG);
109	tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
110	tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
111	__raw_writel(tmp, S3C2412_PWRCFG);
112
113	s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
114	return 0;
115}
116
117static struct sysdev_driver s3c2412_pm_driver = {
118	.add		= s3c2412_pm_add,
119	.suspend	= s3c2412_pm_suspend,
120	.resume		= s3c2412_pm_resume,
121};
122
123static __init int s3c2412_pm_init(void)
124{
125	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
126}
127
128arch_initcall(s3c2412_pm_init);
129