/*
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Based on arch/arm/plat-s3c24xx/irq-pm.c,
 * Copyright (c) 2003,2004 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/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>

#include <plat/cpu.h>
#include <plat/irqs.h>
#include <plat/pm.h>
#include <mach/map.h>

#include <mach/regs-gpio.h>
#include <mach/regs-irq.h>

/* state for IRQs over sleep */

/* default is to allow for EINT0..EINT31, and IRQ_RTC_TIC, IRQ_RTC_ALARM,
 * as wakeup sources
 *
 * set bit to 1 in allow bitfield to enable the wakeup settings on it
*/

unsigned long s3c_irqwake_intallow	= 0x00000006L;
unsigned long s3c_irqwake_eintallow	= 0xffffffffL;

int s3c_irq_wake(struct irq_data *data, unsigned int state)
{
	unsigned long irqbit;
	unsigned int irq_rtc_tic, irq_rtc_alarm;

#ifdef CONFIG_ARCH_EXYNOS
	if (soc_is_exynos5250()) {
		irq_rtc_tic = EXYNOS5_IRQ_RTC_TIC;
		irq_rtc_alarm = EXYNOS5_IRQ_RTC_ALARM;
	} else {
		irq_rtc_tic = EXYNOS4_IRQ_RTC_TIC;
		irq_rtc_alarm = EXYNOS4_IRQ_RTC_ALARM;
	}
#else
	irq_rtc_tic = IRQ_RTC_TIC;
	irq_rtc_alarm = IRQ_RTC_ALARM;
#endif

	if (data->irq == irq_rtc_tic || data->irq == irq_rtc_alarm) {
		irqbit = 1 << (data->irq + 1 - irq_rtc_alarm);

		if (!state)
			s3c_irqwake_intmask |= irqbit;
		else
			s3c_irqwake_intmask &= ~irqbit;
	} else {
		return -ENOENT;
	}

	return 0;
}

static struct sleep_save eint_save[] = {
	SAVE_ITEM(S5P_EINT_CON(0)),
	SAVE_ITEM(S5P_EINT_CON(1)),
	SAVE_ITEM(S5P_EINT_CON(2)),
	SAVE_ITEM(S5P_EINT_CON(3)),

	SAVE_ITEM(S5P_EINT_FLTCON(0)),
	SAVE_ITEM(S5P_EINT_FLTCON(1)),
	SAVE_ITEM(S5P_EINT_FLTCON(2)),
	SAVE_ITEM(S5P_EINT_FLTCON(3)),
	SAVE_ITEM(S5P_EINT_FLTCON(4)),
	SAVE_ITEM(S5P_EINT_FLTCON(5)),
	SAVE_ITEM(S5P_EINT_FLTCON(6)),
	SAVE_ITEM(S5P_EINT_FLTCON(7)),

	SAVE_ITEM(S5P_EINT_MASK(0)),
	SAVE_ITEM(S5P_EINT_MASK(1)),
	SAVE_ITEM(S5P_EINT_MASK(2)),
	SAVE_ITEM(S5P_EINT_MASK(3)),
};

int s3c24xx_irq_suspend(void)
{
	s3c_pm_do_save(eint_save, ARRAY_SIZE(eint_save));

	return 0;
}

void s3c24xx_irq_resume(void)
{
	s3c_pm_do_restore(eint_save, ARRAY_SIZE(eint_save));
}