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/* linux/arch/arm/mach-s3c2410/s3c2412-pm.c
*
* Copyright (c) 2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* http://armlinux.simtec.co.uk/.
*
* 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/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/sysdev.h>
#include <linux/platform_device.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/arch/regs-power.h>
#include <asm/arch/regs-gpioj.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-dsc.h>
#include "cpu.h"
#include "pm.h"
#include "s3c2412.h"
static void s3c2412_cpu_suspend(void)
{
unsigned long tmp;
/* set our standby method to sleep */
tmp = __raw_readl(S3C2412_PWRCFG);
tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
__raw_writel(tmp, S3C2412_PWRCFG);
/* issue the standby signal into the pm unit. Note, we
* issue a write-buffer drain just in case */
tmp = 0;
asm("b 1f\n\t"
".align 5\n\t"
"1:\n\t"
"mcr p15, 0, %0, c7, c10, 4\n\t"
"mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
/* we should never get past here */
panic("sleep resumed to originator?");
}
static void s3c2412_pm_prepare(void)
{
}
static int s3c2412_pm_add(struct sys_device *sysdev)
{
pm_cpu_prep = s3c2412_pm_prepare;
pm_cpu_sleep = s3c2412_cpu_suspend;
return 0;
}
static struct sleep_save s3c2412_sleep[] = {
SAVE_ITEM(S3C2412_DSC0),
SAVE_ITEM(S3C2412_DSC1),
SAVE_ITEM(S3C2413_GPJDAT),
SAVE_ITEM(S3C2413_GPJCON),
SAVE_ITEM(S3C2413_GPJUP),
/* save the PWRCFG to get back to original sleep method */
SAVE_ITEM(S3C2412_PWRCFG),
/* save the sleep configuration anyway, just in case these
* get damaged during wakeup */
SAVE_ITEM(S3C2412_GPBSLPCON),
SAVE_ITEM(S3C2412_GPCSLPCON),
SAVE_ITEM(S3C2412_GPDSLPCON),
SAVE_ITEM(S3C2412_GPESLPCON),
SAVE_ITEM(S3C2412_GPFSLPCON),
SAVE_ITEM(S3C2412_GPGSLPCON),
SAVE_ITEM(S3C2412_GPHSLPCON),
SAVE_ITEM(S3C2413_GPJSLPCON),
};
static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
{
s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
return 0;
}
static int s3c2412_pm_resume(struct sys_device *dev)
{
unsigned long tmp;
tmp = __raw_readl(S3C2412_PWRCFG);
tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
__raw_writel(tmp, S3C2412_PWRCFG);
s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
return 0;
}
static struct sysdev_driver s3c2412_pm_driver = {
.add = s3c2412_pm_add,
.suspend = s3c2412_pm_suspend,
.resume = s3c2412_pm_resume,
};
static __init int s3c2412_pm_init(void)
{
return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
}
arch_initcall(s3c2412_pm_init);
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