text: /* 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/sysdev.h>
  
  #include <plat/cpu.h>
  #include <plat/pm.h>
  #include <plat/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(unsigned int irqno, unsigned int state)
  {
  	unsigned long irqbit = 1 << (irqno - IRQ_EINT0);
  
  	if (!(s3c_irqwake_intallow & irqbit))
  		return -ENOENT;
  
  	printk(KERN_INFO "wake %s for irq %d\n",
  	       state ? "enabled" : "disabled", irqno);
  
  	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;
  
  int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
  {
  	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;
  }
  
  int s3c24xx_irq_resume(struct sys_device *dev)
  {
  	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);
  
  	return 0;
  }
  