Root/arch/arm/mach-s3c2412/pm.c

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#include <linux/io.h>
22
23#include <mach/hardware.h>
24#include <asm/cacheflush.h>
25#include <asm/irq.h>
26
27#include <mach/regs-power.h>
28#include <mach/regs-gpioj.h>
29#include <mach/regs-gpio.h>
30#include <mach/regs-dsc.h>
31
32#include <plat/cpu.h>
33#include <plat/pm.h>
34
35#include <plat/s3c2412.h>
36
37extern void s3c2412_sleep_enter(void);
38
39static void s3c2412_cpu_suspend(void)
40{
41    unsigned long tmp;
42
43    flush_cache_all();
44
45    /* set our standby method to sleep */
46
47    tmp = __raw_readl(S3C2412_PWRCFG);
48    tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
49    __raw_writel(tmp, S3C2412_PWRCFG);
50
51    s3c2412_sleep_enter();
52}
53
54static void s3c2412_pm_prepare(void)
55{
56}
57
58static int s3c2412_pm_add(struct sys_device *sysdev)
59{
60    pm_cpu_prep = s3c2412_pm_prepare;
61    pm_cpu_sleep = s3c2412_cpu_suspend;
62
63    return 0;
64}
65
66static struct sleep_save s3c2412_sleep[] = {
67    SAVE_ITEM(S3C2412_DSC0),
68    SAVE_ITEM(S3C2412_DSC1),
69    SAVE_ITEM(S3C2413_GPJDAT),
70    SAVE_ITEM(S3C2413_GPJCON),
71    SAVE_ITEM(S3C2413_GPJUP),
72
73    /* save the PWRCFG to get back to original sleep method */
74
75    SAVE_ITEM(S3C2412_PWRCFG),
76
77    /* save the sleep configuration anyway, just in case these
78     * get damaged during wakeup */
79
80    SAVE_ITEM(S3C2412_GPBSLPCON),
81    SAVE_ITEM(S3C2412_GPCSLPCON),
82    SAVE_ITEM(S3C2412_GPDSLPCON),
83    SAVE_ITEM(S3C2412_GPFSLPCON),
84    SAVE_ITEM(S3C2412_GPGSLPCON),
85    SAVE_ITEM(S3C2412_GPHSLPCON),
86    SAVE_ITEM(S3C2413_GPJSLPCON),
87};
88
89static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
90{
91    s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
92    return 0;
93}
94
95static int s3c2412_pm_resume(struct sys_device *dev)
96{
97    unsigned long tmp;
98
99    tmp = __raw_readl(S3C2412_PWRCFG);
100    tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
101    tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
102    __raw_writel(tmp, S3C2412_PWRCFG);
103
104    s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
105    return 0;
106}
107
108static struct sysdev_driver s3c2412_pm_driver = {
109    .add = s3c2412_pm_add,
110    .suspend = s3c2412_pm_suspend,
111    .resume = s3c2412_pm_resume,
112};
113
114static __init int s3c2412_pm_init(void)
115{
116    return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
117}
118
119arch_initcall(s3c2412_pm_init);
120

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