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/*
 *  include/asm/arch/wdt.h
 *
 *  Copyright (C) 2012 MStar Semiconductor.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
#ifndef __ASM_ARCH_WDT_H
#define __ASM_ARCH_WDT_H

#include <asm/arch/ips/wdt.h>
#include <asm/errno.h>

#define WDT_DEFAULT_TIME        5 //seconds
#define WDT_MAX_TIME           21 //seconds
#define WDT_UNCOMPRESS_TIME     4 //seconds

#ifdef UBOOT_COMPILE
# define WDT_CLK get_master_clock()
#else
# define WDT_CLK PCLK
#endif

#ifndef __ASSEMBLY__

/** Addressing space. */
enum spc300_wdt_addressing_space
{
    /** Physical address. */
    SPC300_WDT_ADDRESSING_PHYSICAL,
    /** Virtual address. */
    SPC300_WDT_ADDRESSING_VIRTUAL,
};

/** Global watchdog mode variable */
extern uint32_t spc300_wdt_user_mode;

/**
 * Refresh watchdog timer.
 *
 * \param  as  addressing space (virtual or physical) used to access
 * registers.
 */
static void spc300_wdt_refresh_(enum spc300_wdt_addressing_space as)
{
    uint32_t reg = WDT_BF(CR, WDT_CR_VAL);
    if (as == SPC300_WDT_ADDRESSING_VIRTUAL)
        WDT_CRR_VA = reg;
    else
        WDT_CRR_PA = reg;
}

/**
 * Start watchdog timer countdown.
 *
 * \param  timeout_s  timeout of the watchdog (in second).
 * \param  as  addressing space (virtual or physical) used to access
 * registers.
 * \return  0 if no error, error value otherwise (-EINVAL if timeout_s is too
 * big).
 */
static int spc300_wdt_start_(uint timeout_s,
                             enum spc300_wdt_addressing_space as)
{
    uint32_t cnt_value, top, reg;

    //Timeout period = (2^(16+ TOP_reg)) / WDT_CLK

    // Configure timeout?
    if(timeout_s)
    {
        if(timeout_s > WDT_MAX_TIME)
            return -EINVAL;

        cnt_value = timeout_s * WDT_CLK;

        for(top=15 ; top>0 ; top--)
        {
            if(cnt_value >= (1<<(top+16)))
            {
                if (as == SPC300_WDT_ADDRESSING_VIRTUAL)
                    WDT_TORR_VA = WDT_BFINS(TOP, top, WDT_TORR_VA);
                else
                    WDT_TORR_PA = WDT_BFINS(TOP, top, WDT_TORR_PA);
                break;
            }
        }
    }
    //Enable WDT with reset pulse = 32pclk and without interrupt management
    reg = WDT_BF(RPL, 4) | WDT_BF(RMOD, 0) | WDT_BF(EN, 1);
    if (as == SPC300_WDT_ADDRESSING_VIRTUAL)
        WDT_CR_VA = reg;
    else
        WDT_CR_PA = reg;
    spc300_wdt_refresh_(as);
    return 0;
}

/**
 * Start watchdog timer countdown.
 *
 * \param  timeout_s  timeout of the watchdog (in second).
 * \return  0 if no error, error value otherwise (-EINVAL if timeout_s is too
 * big).
 *
 * This function can be called even if the watchdog is already counting down:
 * it is used to both start and configure the watchdog.
 */
static inline int spc300_wdt_start(uint timeout_s)
{
    return spc300_wdt_start_(timeout_s, SPC300_WDT_ADDRESSING_VIRTUAL);
}

/**
 * Start watchdog timer countdown (using physical address).
 *
 * \param  timeout_s  timeout of the watchdog (in second).
 * \return  0 if no error, error value otherwise (-EINVAL if timeout_s is too
 * big).
 *
 * This function is the same as spc300_wdt_start but using physical address.
 */
static inline int spc300_wdt_start_pa(uint timeout_s)
{
    return spc300_wdt_start_(timeout_s, SPC300_WDT_ADDRESSING_PHYSICAL);
}

/**
 * Refresh watchdog timer.
 */
static inline void spc300_wdt_refresh(void)
{
    spc300_wdt_refresh_ (SPC300_WDT_ADDRESSING_VIRTUAL);
}

/**
 * Refresh watchdog timer (using physical address).
 */
static inline void spc300_wdt_refresh_pa(void)
{
    spc300_wdt_refresh_ (SPC300_WDT_ADDRESSING_PHYSICAL);
}

/**
 * Switch watchdog between user and kernel mode.
 *
 * \param  use_umode  1 to switch to user mode.
 */
void spc300_wdt_switch(int use_umode);

/**
 * Get the watchdog time interval.
 *
 * \return  time interval.
 */
int spc300_wdt_gettimeout(void);

#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARCH_WDT_H */