pm-s3c2412.c

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/* linux/arch/arm/mach-s3c2412/pm.c
 *
 * Copyright (c) 2006 Simtec Electronics
 *  Ben Dooks <[email protected]>
 *
 * 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/device.h>
#include <linux/syscore_ops.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-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 int s3c2412_cpu_suspend(unsigned long arg)
{
    unsigned long tmp;

    /* set our standby method to sleep */

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

    s3c2412_sleep_enter();

    panic("sleep resumed to originator?");
}

static void s3c2412_pm_prepare(void)
{
}

static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
{
    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 struct subsys_interface s3c2412_pm_interface = {
    .name       = "s3c2412_pm",
    .subsys     = &s3c2412_subsys,
    .add_dev    = s3c2412_pm_add,
};

static __init int s3c2412_pm_init(void)
{
    return subsys_interface_register(&s3c2412_pm_interface);
}

arch_initcall(s3c2412_pm_init);

static int s3c2412_pm_suspend(void)
{
    s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
    return 0;
}

static void s3c2412_pm_resume(void)
{
    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));
}

struct syscore_ops s3c2412_pm_syscore_ops = {
    .suspend    = s3c2412_pm_suspend,
    .resume     = s3c2412_pm_resume,
};