Subversion Repositories openrisc_2011-10-31

/* ----------------------------------------------------------------------------

 *         ATMEL Microcontroller Software Support

 * ----------------------------------------------------------------------------

 * Copyright (c) 2008, Atmel Corporation

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * - Redistributions of source code must retain the above copyright notice,

 * this list of conditions and the disclaimer below.

 *

 * Atmel's name may not be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.

 * ----------------------------------------------------------------------------

 */

//-----------------------------------------------------------------------------

//         Headers

//-----------------------------------------------------------------------------

#include <board.h>

//-----------------------------------------------------------------------------

//         Macros

//-----------------------------------------------------------------------------

/// WRITE_RSTC: Write RSTC register

#define WRITE_RSTC(pRstc, regName, value) pRstc->regName = (value)

/// READ_RSTC: Read RSTC registers

#define READ_RSTC(pRstc, regName) (pRstc->regName)

//-----------------------------------------------------------------------------

//         Defines

//-----------------------------------------------------------------------------

/// Keywords to write to the reset registers

#define RSTC_KEY_PASSWORD       (0xA5UL << 24)

//-----------------------------------------------------------------------------

//         Exported functions

//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------

/// Configure the mode of the RSTC peripheral.

/// The configuration is computed by the lib (AT91C_RSTC_*).

/// \param rstc  Pointer to an RSTC peripheral.

/// \param rmr Desired mode configuration.

//-----------------------------------------------------------------------------

void RSTC_ConfigureMode(AT91PS_RSTC rstc, unsigned int rmr)

{

    rmr &= ~AT91C_RSTC_KEY;

    WRITE_RSTC(rstc, RSTC_RMR, rmr | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Enable/Disable the detection of a low level on the pin NRST as User Reset

/// \param rstc   Pointer to an RSTC peripheral.

/// \param enable 1 to enable & 0 to disable.

//-----------------------------------------------------------------------------

void RSTC_SetUserResetEnable(AT91PS_RSTC rstc, unsigned char enable)

{

    unsigned int rmr = READ_RSTC(rstc, RSTC_RMR) & (~AT91C_RSTC_KEY);

    if (enable) {

        rmr |=  AT91C_RSTC_URSTEN;

    }

    else {

        rmr &= ~AT91C_RSTC_URSTEN;

    }

    WRITE_RSTC(rstc, RSTC_RMR, rmr | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Enable/Disable the interrupt of a User Reset (USRTS bit in RSTC_RST).

/// \param rstc   Pointer to an RSTC peripheral.

/// \param enable 1 to enable & 0 to disable.

//-----------------------------------------------------------------------------

void RSTC_SetUserResetInterruptEnable(AT91PS_RSTC rstc, unsigned char enable)

{

    unsigned int rmr = READ_RSTC(rstc, RSTC_RMR) & (~AT91C_RSTC_KEY);

    if (enable) {

        rmr |=  AT91C_RSTC_URSTIEN;

    }

    else {

        rmr &= ~AT91C_RSTC_URSTIEN;

    }

    WRITE_RSTC(rstc, RSTC_RMR, rmr | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Setup the external reset length. The length is asserted during a time of

/// pow(2, powl+1) Slow Clock(32KHz). The duration is between 60us and 2s.

/// \param rstc   Pointer to an RSTC peripheral.

/// \param powl   Power length defined.

//-----------------------------------------------------------------------------

void RSTC_SetExtResetLength(AT91PS_RSTC rstc, unsigned char powl)

{

    unsigned int rmr = READ_RSTC(rstc, RSTC_RMR);

    rmr &= ~(AT91C_RSTC_KEY | AT91C_RSTC_ERSTL);

    rmr |=  (powl << 8) & AT91C_RSTC_ERSTL;

    WRITE_RSTC(rstc, RSTC_RMR, rmr | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Resets the processor.

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

void RSTC_ProcessorReset(AT91PS_RSTC rstc)

{

    WRITE_RSTC(rstc, RSTC_RCR, AT91C_RSTC_PROCRST | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Resets the peripherals.

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

void RSTC_PeripheralReset(AT91PS_RSTC rstc)

{

    WRITE_RSTC(rstc, RSTC_RCR, AT91C_RSTC_PERRST | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Asserts the NRST pin for external resets.

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

void RSTC_ExtReset(AT91PS_RSTC rstc)

{

    WRITE_RSTC(rstc, RSTC_RCR, AT91C_RSTC_EXTRST | RSTC_KEY_PASSWORD);

}

//-----------------------------------------------------------------------------

/// Return NRST pin level ( 1 or 0 ).

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

unsigned char RSTC_GetNrstLevel(AT91PS_RSTC rstc)

{

    if (READ_RSTC(rstc, RSTC_RSR) & AT91C_RSTC_NRSTL) {

        return 1;

    }

    return 0;

}

//-----------------------------------------------------------------------------

/// Returns 1 if at least one high-to-low transition of NRST (User Reset) has

/// been detected since the last read of RSTC_RSR.

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

unsigned char RSTC_IsUserReseetDetected(AT91PS_RSTC rstc)

{

    if (READ_RSTC(rstc, RSTC_RSR) & AT91C_RSTC_URSTS) {

        return 1;

    }

    return 0;

}

//-----------------------------------------------------------------------------

/// Return 1 if a software reset command is being performed by the reset

/// controller. The reset controller is busy.

/// \param rstc  Pointer to an RSTC peripheral.

//-----------------------------------------------------------------------------

unsigned char RSTC_IsBusy(AT91PS_RSTC rstc)

{

    if (READ_RSTC(rstc, RSTC_RSR) & AT91C_RSTC_SRCMP) {

        return 1;

    }

    return 0;

}