/* linux/arch/arm/mach-s3c2416/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 <asm/cacheflush.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <asm/arch/regs-mem.h>
#include <asm/arch/regs-power.h>
#include <asm/arch/regs-gpioj.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-irq.h>
#include <asm/arch/regs-dsc.h>
#include <asm/arch/regs-s3c2416-clock.h>

#include <asm/plat-s3c24xx/cpu.h>
#include <asm/plat-s3c24xx/pm.h>

#include <asm/plat-s3c24xx/s3c2416.h>

#include <asm/gpio.h>

#ifdef CONFIG_PM_CPU_MODE
extern unsigned char pm_cpu_mode;
#endif

static void s3c2416_cpu_suspend(void)
{
	unsigned long tmp;

#if  0
   /* This is the USB driver work not PM */
	/* USB Physical power */
	__raw_writel(__raw_readl(S3C2443_PHYPWR) | 0xf, S3C2443_PHYPWR);

	/* USB Suspend mode */
	__raw_writel(__raw_readl(S3C2410_MISCCR)|(1<<12)|(1<<13), S3C2410_MISCCR);
#endif

#if 0
        /* What the heck??? We configure (even badly) MASK & PENDING ints, and we
         * set them after to a more bad value ???? */
        __raw_writel(0xffffffff, S3C2410_INTMSK);
	__raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND);
	__raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND);

	__raw_writel(0xffffffff, S3C2410_EINTPEND);
	__raw_writel(0xffffffff, S3C2410_EINTMASK);
	__raw_writel(0xffffffff, S3C2410_SRCPND);
	__raw_writel(0xffffffff, S3C2410_INTPND);
	__raw_writel((0xffffffff & ~((1<<0) | (1<<3) | (1<<30))) , S3C2410_INTMSK);
#endif

        /* TODO: Need verification */
	__raw_writel(0xff80, S3C2443_RSTCON);
	__raw_writel(0xffff, S3C2443_OSCSET);

	/* Allow wakeup even if BATT_FLT is asserted */
        __raw_writel( (1<<15), S3C2443_PWRCFG);

#if 0
        /* Test */

        /* shutdown as many device as possible */
        /* Disable USB power */
        /* Disable SD Power */
        tmp = __raw_readl(S3C2410_GPHCON);
        tmp &= ~((3<<28)|(3<<8));
        tmp |= (1<<28)|(1<<8);
        __raw_writel(tmp, S3C2410_GPHCON);
        tmp = __raw_readl(S3C2410_GPHUP);
        tmp &= ~((3<<28)|(3<<8));
        __raw_writel(tmp, S3C2410_GPHUP);
        tmp = __raw_readl(S3C2410_GPHDAT);
        tmp &= ~((1<<14)|(1<<4));
        __raw_writel(tmp, S3C2410_GPHDAT);

        /* Disable TCON power */
        tmp = __raw_readl(S3C2410_GPBCON);
        tmp &= ~((3<<6));
        tmp |= (1<<6);
        __raw_writel(tmp, S3C2410_GPBCON);
        tmp = __raw_readl(S3C2410_GPBUP);
        tmp &= ~((3<<6));
        __raw_writel(tmp, S3C2410_GPBUP);
        tmp = __raw_readl(S3C2410_GPBDAT);
        tmp &= ~(1<<3);
        __raw_writel(tmp, S3C2410_GPBDAT);

        /* Disable Touch power */
        /* Disable wifi/bt power */
        tmp = __raw_readl(S3C2410_GPDCON);
        tmp &= ~((3<<20)|(3<22));
        tmp |= (1<<20)|(1<<22);
        __raw_writel(tmp, S3C2410_GPDCON);
        tmp = __raw_readl(S3C2410_GPDUP);
        tmp &= ~((3<<20)|(3<<22));
        __raw_writel(tmp, S3C2410_GPDUP);
        tmp = __raw_readl(S3C2410_GPDDAT);
        tmp &= ~((1<<11)|(1<<10));
        __raw_writel(tmp, S3C2410_GPDDAT);
#endif


#ifdef CONFIG_PM_CPU_MODE
	/* set our standby method to sleep */
    switch(pm_cpu_mode)
    {
    case PM_CPU_DEVICE_MODE_SUSPEND:
           __raw_writel(0x2BED, S3C2443_PWRMODE);
        break; 
    
    case PM_CPU_MODE_STOP:
           __raw_writel(((__raw_readl(S3C2443_PWRMODE) & ~(1<<16))| (1<<16)), S3C2443_PWRMODE);
        break;
        
    case PM_CPU_MODE_DEEP_STOP:			
            __raw_writel(((__raw_readl(S3C2443_PWRCFG) & ~(1<<16))| (1<<16)), S3C2443_PWRCFG);
            __raw_writel(((__raw_readl(S3C2443_PWRMODE) & ~(1<<16))| (1<<16)), S3C2443_PWRMODE);
        break;
        
        case PM_CPU_MODE_IDLE:
           __raw_writel(((__raw_readl(S3C2443_PWRCFG) & ~(1<<17))| (1<<17)), S3C2443_PWRCFG);
	   asm("mcr p15, 0, r0, c7, c0, 4");	/* wait for interrupt "STANDBYWFI" */
        break;
        case PM_CPU_MODE_SLEEP:
           __raw_writel(0x2BED, S3C2443_PWRMODE);
        break;
        default:
           __raw_writel(0x2BED, S3C2443_PWRMODE);
        break;
    }
#else
	__raw_writel(0x2BED, S3C2443_PWRMODE);
#endif
}

static void s3c2416_pm_prepare(void)
{
	/* set flag to wake up */
	__raw_writel(0x2BED, S3C2443_INFORM0);

        /* Set Power_Mode to low */
        //s3c2410_gpio_cfgpin(S3C2410_GPD12, S3C2410_GPD12_OUTP); /* <- D12 should already be configured */
        /* TODO: have a "charger/battery driver" (maybe inside the USB driver?) */
        s3c2410_gpio_setpin(S3C2410_GPD12, 0);
}

static int s3c2416_pm_add(struct sys_device *sysdev)
{
	pm_cpu_prep = s3c2416_pm_prepare;
	pm_cpu_sleep = s3c2416_cpu_suspend;

	return 0;
}

static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state)
{
	
	return 0;
}

static int s3c2416_pm_resume(struct sys_device *dev)
{
	__raw_writel(0x0, S3C2443_INFORM0);

        /* set PowerMode as high */
	// s3c2410_gpio_cfgpin(S3C2410_GPD12, S3C2410_GPD12_OUTP); /* <- D12 should already be configured */
        s3c2410_gpio_setpin(S3C2410_GPD12, 1);


	return 0;
}

static struct sysdev_driver s3c2416_pm_driver = {
	.add		= s3c2416_pm_add,
	.suspend	= s3c2416_pm_suspend,
	.resume		= s3c2416_pm_resume,
};

static __init int s3c2416_pm_init(void)
{
	return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
}

arch_initcall(s3c2416_pm_init);