arch/arm/plat-s3c24xx/irq-pm.c

   1 /* linux/arch/arm/plat-s3c24xx/irq-om.c
   2  *
   3  * Copyright (c) 2003-2004 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *      http://armlinux.simtec.co.uk/
   6  *
   7  * S3C24XX - IRQ PM code
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18
  19 #include <plat/cpu.h>
  20 #include <plat/pm.h>
  21 #include <plat/irq.h>
  22
  23 #include <asm/irq.h>
  24
  25 /* state for IRQs over sleep */
  26
  27 /* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
  28  *
  29  * set bit to 1 in allow bitfield to enable the wakeup settings on it
  30 */
  31
  32 unsigned long s3c_irqwake_intallow      = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
  33 unsigned long s3c_irqwake_eintallow     = 0x0000fff0L;
  34
  35 int s3c_irq_wake(struct irq_data *data, unsigned int state)
  36 {
  37         unsigned long irqbit = 1 << (data->irq - IRQ_EINT0);
  38
  39         if (!(s3c_irqwake_intallow & irqbit))
  40                 return -ENOENT;
  41
  42         printk(KERN_INFO "wake %s for irq %d\n",
  43                state ? "enabled" : "disabled", data->irq);
  44
  45         if (!state)
  46                 s3c_irqwake_intmask |= irqbit;
  47         else
  48                 s3c_irqwake_intmask &= ~irqbit;
  49
  50         return 0;
  51 }
  52
  53 static struct sleep_save irq_save[] = {
  54         SAVE_ITEM(S3C2410_INTMSK),
  55         SAVE_ITEM(S3C2410_INTSUBMSK),
  56 };
  57
  58 /* the extint values move between the s3c2410/s3c2440 and the s3c2412
  59  * so we use an array to hold them, and to calculate the address of
  60  * the register at run-time
  61 */
  62
  63 static unsigned long save_extint[3];
  64 static unsigned long save_eintflt[4];
  65 static unsigned long save_eintmask;
  66
  67 int s3c24xx_irq_suspend(void)
  68 {
  69         unsigned int i;
  70
  71         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  72                 save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
  73
  74         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  75                 save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
  76
  77         s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  78         save_eintmask = __raw_readl(S3C24XX_EINTMASK);
  79
  80         return 0;
  81 }
  82
  83 void s3c24xx_irq_resume(void)
  84 {
  85         unsigned int i;
  86
  87         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  88                 __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
  89
  90         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  91                 __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
  92
  93         s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  94         __raw_writel(save_eintmask, S3C24XX_EINTMASK);
  95 }