2.3-InternetRadio/nutos/nut/arch/arm/dev/atmel/at91_reset.c

/*
 * Copyright 2008 by egnite GmbH
 *
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 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    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
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/*!
 * \file arch/arm/dev/at91_reset.c
 * \brief AT91 system reset.
 *
 * \verbatim
 * $Id: at91_reset.c 3449 2011-05-31 19:08:15Z mifi $
 * \endverbatim
 */

#include <arch/arm.h>
#include <dev/watchdog.h>
#include <dev/reset.h>

/*!
 * \addtogroup xgNutArchArmAt91Rstc
 */
/*@{*/

/*!
 * \brief System reset.
 */
void At91Reset(void)
{
#if defined(RSTC_PROCRST)
    /* Use reset controller if available. */
    outr(RSTC_CR, RSTC_KEY | RSTC_EXTRST | RSTC_PERRST | RSTC_PROCRST);
#else
    /* Otherwise use the watchdog. */
    if (At91WatchDogStart(1, 0)) {
        for (;;);
    }
#endif
}

int At91ResetCause(void)
{
    int rc = NUT_RSTTYP_UNKNOWN;

#if defined(RSTC_SR)
    switch (inr(RSTC_SR) & RSTC_RSTTYP) {
    case RSTC_RSTTYP_POWERUP:
        rc = NUT_RSTTYP_POWERUP;
        break;
    case RSTC_RSTTYP_WATCHDOG:
        rc = NUT_RSTTYP_WATCHDOG;
        break;
    case RSTC_RSTTYP_SOFTWARE:
        rc = NUT_RSTTYP_SOFTWARE;
        break;
    case RSTC_RSTTYP_USER:
        rc = NUT_RSTTYP_EXTERNAL;
        break;
    case RSTC_RSTTYP_BROWNOUT:
        rc = NUT_RSTTYP_BROWNOUT;
        break;
    }
#endif
    return rc;
}

/*@}*/