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pm.c

/* linux/arch/arm/mach-s3c2412/pm.c
 *
 * Copyright (c) 2006 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * http://armlinux.simtec.co.uk/.
 *
 * 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/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/sysdev.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/cacheflush.h>
#include <asm/irq.h>

#include <mach/regs-power.h>
#include <mach/regs-gpioj.h>
#include <mach/regs-gpio.h>
#include <mach/regs-dsc.h>

#include <plat/cpu.h>
#include <plat/pm.h>

#include <plat/s3c2412.h>

extern void s3c2412_sleep_enter(void);

static void s3c2412_cpu_suspend(void)
{
      unsigned long tmp;

      flush_cache_all();

      /* set our standby method to sleep */

      tmp = __raw_readl(S3C2412_PWRCFG);
      tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
      __raw_writel(tmp, S3C2412_PWRCFG);

      s3c2412_sleep_enter();
}

static void s3c2412_pm_prepare(void)
{
}

static int s3c2412_pm_add(struct sys_device *sysdev)
{
      pm_cpu_prep = s3c2412_pm_prepare;
      pm_cpu_sleep = s3c2412_cpu_suspend;

      return 0;
}

static struct sleep_save s3c2412_sleep[] = {
      SAVE_ITEM(S3C2412_DSC0),
      SAVE_ITEM(S3C2412_DSC1),
      SAVE_ITEM(S3C2413_GPJDAT),
      SAVE_ITEM(S3C2413_GPJCON),
      SAVE_ITEM(S3C2413_GPJUP),

      /* save the PWRCFG to get back to original sleep method */

      SAVE_ITEM(S3C2412_PWRCFG),

      /* save the sleep configuration anyway, just in case these
       * get damaged during wakeup */

      SAVE_ITEM(S3C2412_GPBSLPCON),
      SAVE_ITEM(S3C2412_GPCSLPCON),
      SAVE_ITEM(S3C2412_GPDSLPCON),
      SAVE_ITEM(S3C2412_GPFSLPCON),
      SAVE_ITEM(S3C2412_GPGSLPCON),
      SAVE_ITEM(S3C2412_GPHSLPCON),
      SAVE_ITEM(S3C2413_GPJSLPCON),
};

static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
{
      s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
      return 0;
}

static int s3c2412_pm_resume(struct sys_device *dev)
{
      unsigned long tmp;

      tmp = __raw_readl(S3C2412_PWRCFG);
      tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
      tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
      __raw_writel(tmp, S3C2412_PWRCFG);

      s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
      return 0;
}

static struct sysdev_driver s3c2412_pm_driver = {
      .add        = s3c2412_pm_add,
      .suspend    = s3c2412_pm_suspend,
      .resume           = s3c2412_pm_resume,
};

static __init int s3c2412_pm_init(void)
{
      return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
}

arch_initcall(s3c2412_pm_init);

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