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/* linux/arch/arm/plat-s3c24xx/irq-om.c
*
* Copyright (c) 2003-2004 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C24XX - IRQ PM code
*
* 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 <linux/irq.h>
#include <linux/syscore_ops.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/irq.h>
#include <asm/irq.h>
/* state for IRQs over sleep */
/* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
*
* set bit to 1 in allow bitfield to enable the wakeup settings on it
*/
unsigned long s3c_irqwake_intallow = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
unsigned long s3c_irqwake_eintallow = 0x0000fff0L;
int s3c_irq_wake(struct irq_data *data, unsigned int state)
{
unsigned long irqbit = 1 << (data->irq - IRQ_EINT0);
if (!(s3c_irqwake_intallow & irqbit))
return -ENOENT;
printk(KERN_INFO "wake %s for irq %d\n",
state ? "enabled" : "disabled", data->irq);
if (!state)
s3c_irqwake_intmask |= irqbit;
else
s3c_irqwake_intmask &= ~irqbit;
return 0;
}
static struct sleep_save irq_save[] = {
SAVE_ITEM(S3C2410_INTMSK),
SAVE_ITEM(S3C2410_INTSUBMSK),
};
/* the extint values move between the s3c2410/s3c2440 and the s3c2412
* so we use an array to hold them, and to calculate the address of
* the register at run-time
*/
static unsigned long save_extint[3];
static unsigned long save_eintflt[4];
static unsigned long save_eintmask;
static int s3c24xx_irq_suspend(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(save_extint); i++)
save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
save_eintmask = __raw_readl(S3C24XX_EINTMASK);
return 0;
}
static void s3c24xx_irq_resume(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(save_extint); i++)
__raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
__raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
__raw_writel(save_eintmask, S3C24XX_EINTMASK);
}
struct syscore_ops s3c24xx_irq_syscore_ops = {
.suspend = s3c24xx_irq_suspend,
.resume = s3c24xx_irq_resume,
};
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