arch/arm/mach-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 #include <linux/syscore_ops.h>
  19 #include <linux/io.h>
  20
  21 #include <plat/cpu.h>
  22 #include <plat/pm.h>
  23 #include <plat/map-base.h>
  24 #include <plat/map-s3c.h>
  25
  26 #include <mach/regs-irq.h>
  27 #include <mach/regs-gpio.h>
  28 #include <mach/pm-core.h>
  29
  30 #include <asm/irq.h>
  31
  32 int s3c_irq_wake(struct irq_data *data, unsigned int state)
  33 {
  34         unsigned long irqbit = 1 << data->hwirq;
  35
  36         if (!(s3c_irqwake_intallow & irqbit))
  37                 return -ENOENT;
  38
  39         pr_info("wake %s for hwirq %lu\n",
  40                 state ? "enabled" : "disabled", data->hwirq);
  41
  42         if (!state)
  43                 s3c_irqwake_intmask |= irqbit;
  44         else
  45                 s3c_irqwake_intmask &= ~irqbit;
  46
  47         return 0;
  48 }
  49
  50 static struct sleep_save irq_save[] = {
  51         SAVE_ITEM(S3C2410_INTMSK),
  52         SAVE_ITEM(S3C2410_INTSUBMSK),
  53 };
  54
  55 /* the extint values move between the s3c2410/s3c2440 and the s3c2412
  56  * so we use an array to hold them, and to calculate the address of
  57  * the register at run-time
  58 */
  59
  60 static unsigned long save_extint[3];
  61 static unsigned long save_eintflt[4];
  62 static unsigned long save_eintmask;
  63
  64 static int s3c24xx_irq_suspend(void)
  65 {
  66         unsigned int i;
  67
  68         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  69                 save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
  70
  71         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  72                 save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
  73
  74         s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  75         save_eintmask = __raw_readl(S3C24XX_EINTMASK);
  76
  77         return 0;
  78 }
  79
  80 static void s3c24xx_irq_resume(void)
  81 {
  82         unsigned int i;
  83
  84         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  85                 __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
  86
  87         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  88                 __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
  89
  90         s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  91         __raw_writel(save_eintmask, S3C24XX_EINTMASK);
  92 }
  93
  94 struct syscore_ops s3c24xx_irq_syscore_ops = {
  95         .suspend        = s3c24xx_irq_suspend,
  96         .resume         = s3c24xx_irq_resume,
  97 };
  98
  99 #ifdef CONFIG_CPU_S3C2416
 100 static struct sleep_save s3c2416_irq_save[] = {
 101         SAVE_ITEM(S3C2416_INTMSK2),
 102 };
 103
 104 static int s3c2416_irq_suspend(void)
 105 {
 106         s3c_pm_do_save(s3c2416_irq_save, ARRAY_SIZE(s3c2416_irq_save));
 107
 108         return 0;
 109 }
 110
 111 static void s3c2416_irq_resume(void)
 112 {
 113         s3c_pm_do_restore(s3c2416_irq_save, ARRAY_SIZE(s3c2416_irq_save));
 114 }
 115
 116 struct syscore_ops s3c2416_irq_syscore_ops = {
 117         .suspend        = s3c2416_irq_suspend,
 118         .resume         = s3c2416_irq_resume,
 119 };
 120 #endif