pm-s3c2416.c

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/* linux/arch/arm/mach-s3c2416/pm.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *      http://www.samsung.com
 *
 * S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
 *
 * 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/device.h>
#include <linux/syscore_ops.h>
#include <linux/io.h>

#include <asm/cacheflush.h>

#include <mach/regs-power.h>
#include <mach/regs-s3c2443-clock.h>

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

extern void s3c2412_sleep_enter(void);

static int s3c2416_cpu_suspend(unsigned long arg)
{
    /* enable wakeup sources regardless of battery state */
    __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);

    /* set the mode as sleep, 2BED represents "Go to BED" */
    __raw_writel(0x2BED, S3C2443_PWRMODE);

    s3c2412_sleep_enter();

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

static void s3c2416_pm_prepare(void)
{
    /*
     * write the magic value u-boot uses to check for resume into
     * the INFORM0 register, and ensure INFORM1 is set to the
     * correct address to resume from.
     */
    __raw_writel(0x2BED, S3C2412_INFORM0);
    __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
}

static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif)
{
    pm_cpu_prep = s3c2416_pm_prepare;
    pm_cpu_sleep = s3c2416_cpu_suspend;

    return 0;
}

static struct subsys_interface s3c2416_pm_interface = {
    .name       = "s3c2416_pm",
    .subsys     = &s3c2416_subsys,
    .add_dev    = s3c2416_pm_add,
};

static __init int s3c2416_pm_init(void)
{
    return subsys_interface_register(&s3c2416_pm_interface);
}

arch_initcall(s3c2416_pm_init);


static void s3c2416_pm_resume(void)
{
    /* unset the return-from-sleep amd inform flags */
    __raw_writel(0x0, S3C2443_PWRMODE);
    __raw_writel(0x0, S3C2412_INFORM0);
    __raw_writel(0x0, S3C2412_INFORM1);
}

struct syscore_ops s3c2416_pm_syscore_ops = {
    .resume     = s3c2416_pm_resume,
};