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/* linux/arch/arm/mach-s3c2416/pm.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/sysdev.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <mach/regs-power.h>
#include <mach/regs-s3c2443-clock.h>
#include <plat/cpu.h>
#include <plat/pm.h>
extern void s3c2412_sleep_enter(void);
static void s3c2416_cpu_suspend(void)
{
flush_cache_all();
/* enable wakeup sources regardless of battery state */
__raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
/* set the mode as sleep, 2BED represents "Go to BED" */
__raw_writel(0x2BED, S3C2443_PWRMODE);
s3c2412_sleep_enter();
}
static void s3c2416_pm_prepare(void)
{
/*
* write the magic value u-boot uses to check for resume into
* the INFORM0 register, and ensure INFORM1 is set to the
* correct address to resume from.
*/
__raw_writel(0x2BED, S3C2412_INFORM0);
__raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
}
static int s3c2416_pm_add(struct sys_device *sysdev)
{
pm_cpu_prep = s3c2416_pm_prepare;
pm_cpu_sleep = s3c2416_cpu_suspend;
return 0;
}
static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state)
{
return 0;
}
static int s3c2416_pm_resume(struct sys_device *dev)
{
/* unset the return-from-sleep amd inform flags */
__raw_writel(0x0, S3C2443_PWRMODE);
__raw_writel(0x0, S3C2412_INFORM0);
__raw_writel(0x0, S3C2412_INFORM1);
return 0;
}
static struct sysdev_driver s3c2416_pm_driver = {
.add = s3c2416_pm_add,
.suspend = s3c2416_pm_suspend,
.resume = s3c2416_pm_resume,
};
static __init int s3c2416_pm_init(void)
{
return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
}
arch_initcall(s3c2416_pm_init);
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