/*
 *  Copyright (c) 2017, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file implements the OpenThread platform abstraction for miscellaneous behaviors.
 */

#include <openthread/types.h>
#include <openthread/platform/misc.h>

#include "platform-efr32.h"
#include "em_rmu.h"

static uint32_t sResetCause;

void efr32MiscInit(void)
{
    // Read the cause of last reset.
    sResetCause = RMU_ResetCauseGet();

    // Clear the register, as the causes cumulate over resets.
    RMU_ResetCauseClear();
}

void otPlatReset(otInstance *aInstance)
{
    (void)aInstance;
    NVIC_SystemReset();
}

otPlatResetReason otPlatGetResetReason(otInstance *aInstance)
{
    (void)aInstance;
    otPlatResetReason reason;

    if (sResetCause & RMU_RSTCAUSE_PORST)
    {
        reason = OT_PLAT_RESET_REASON_POWER_ON;
    }
    else if (sResetCause & RMU_RSTCAUSE_SYSREQRST)
    {
        reason = OT_PLAT_RESET_REASON_SOFTWARE;
    }
    else if (sResetCause & RMU_RSTCAUSE_WDOGRST)
    {
        reason = OT_PLAT_RESET_REASON_WATCHDOG;
    }
    else if (sResetCause & RMU_RSTCAUSE_EXTRST)
    {
        reason = OT_PLAT_RESET_REASON_EXTERNAL;
    }
    else if (sResetCause & RMU_RSTCAUSE_LOCKUPRST)
    {
        reason = OT_PLAT_RESET_REASON_FAULT;
    }
    else if ((sResetCause & RMU_RSTCAUSE_AVDDBOD) ||
             (sResetCause & RMU_RSTCAUSE_DECBOD)  ||
             (sResetCause & RMU_RSTCAUSE_DVDDBOD) ||
             (sResetCause & RMU_RSTCAUSE_EM4RST))
    {
        reason = OT_PLAT_RESET_REASON_ASSERT;
    }
    else
    {
        reason = OT_PLAT_RESET_REASON_UNKNOWN;
    }

    return reason;
}

void otPlatWakeHost(void)
{
    // TODO: implement an operation to wake the host from sleep state.
}