LXR linux/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/sysdev.h>
  18
  19#include <plat/cpu.h>
  20#include <plat/pm.h>
  21#include <plat/irq.h>
  22
  23/* state for IRQs over sleep */
  24
  25/* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
  26 *
  27 * set bit to 1 in allow bitfield to enable the wakeup settings on it
  28*/
  29
  30unsigned long s3c_irqwake_intallow      = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
  31unsigned long s3c_irqwake_eintallow     = 0x0000fff0L;
  32
  33int s3c_irq_wake(unsigned int irqno, unsigned int state)
  34{
  35        unsigned long irqbit = 1 << (irqno - IRQ_EINT0);
  36
  37        if (!(s3c_irqwake_intallow & irqbit))
  38                return -ENOENT;
  39
  40        printk(KERN_INFO "wake %s for irq %d\n",
  41               state ? "enabled" : "disabled", irqno);
  42
  43        if (!state)
  44                s3c_irqwake_intmask |= irqbit;
  45        else
  46                s3c_irqwake_intmask &= ~irqbit;
  47
  48        return 0;
  49}
  50
  51static struct sleep_save irq_save[] = {
  52        SAVE_ITEM(S3C2410_INTMSK),
  53        SAVE_ITEM(S3C2410_INTSUBMSK),
  54};
  55
  56/* the extint values move between the s3c2410/s3c2440 and the s3c2412
  57 * so we use an array to hold them, and to calculate the address of
  58 * the register at run-time
  59*/
  60
  61static unsigned long save_extint[3];
  62static unsigned long save_eintflt[4];
  63static unsigned long save_eintmask;
  64
  65int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
  66{
  67        unsigned int i;
  68
  69        for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  70                save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
  71
  72        for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  73                save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
  74
  75        s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  76        save_eintmask = __raw_readl(S3C24XX_EINTMASK);
  77
  78        return 0;
  79}
  80
  81int s3c24xx_irq_resume(struct sys_device *dev)
  82{
  83        unsigned int i;
  84
  85        for (i = 0; i < ARRAY_SIZE(save_extint); i++)
  86                __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
  87
  88        for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
  89                __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
  90
  91        s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  92        __raw_writel(save_eintmask, S3C24XX_EINTMASK);
  93
  94        return 0;
  95}
  96