evmdm6437_nandflash.c

evmdm6437_nandflash的函数原型！！！！！！！！！！！！！！！

    else if ( mfg_id == MFG_STI )
    {
        switch( dev_id )
        {
            case DEV_NAND512W3A:
                pages = DEV_NAND512W3A_PAGE_COUNT;
                break;
        }
    }

  //NAND_DEASSERT_CE( );                // Deassert CE ( for CE-care devices )

    return pages;
}

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  _NANDFLASH_erase( start, block_count )                                  *
 *                                                                          *
 *      Erase the blocks of Flash memory                                    *
 *          start = destination address [ block address ]                   *
 *          block_count = # of blocks   [ 1 block = 16384 bytes ]           *
 *                                                                          *
 *      Returns:    0   pass                                                *
 *                  1+  failed - bad blocks                                 *
 *                 -1   timeout                                             *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 EVMDM6437_NANDFLASH_erase( Uint32 start, Uint32 block_count )
{
    Uint32 i;

    invalid_blk_count = 0;

    for ( i = 0 ; i < block_count ; i++ )
    {
      //NAND_ASSERT_CE( );              // Assert CE ( for CE-care devices )

        NAND_CMD( CMD_ERASE );          // Erase block
        NAND_ADDR_3( start );
        NAND_CMD( CMD_ERASE_CONFIRM );  // Confirm Erase

        if ( _NAND_busywait( nand_timeout ) )
        {
          //NAND_DEASSERT_CE( );        // Deassert CE ( for CE-care devices )
            return NAND_ERR_TIMEOUT;    // Timeout Error
        }

        NAND_CMD( CMD_STATUS );         // Check Status

        if ( NAND_DATA & CMD_STATUS_ERROR )
            invalid_blks[invalid_blk_count++] = start;

      //NAND_DEASSERT_CE( );            // Deassert CE ( for CE-care devices )

        start += NAND_BLOCKSIZE;        // Increment address
    }
    return invalid_blk_count;
}

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  _NANDFLASH_readPage( src, dst, page_count )                             *
 *                                                                          *
 *      Read data from NAND Flash by pages ( 512 bytes )                    *
 *                                                                          *
 *          src = source address      [ must be aligned to start of page ]  *
 *          dst = destination address [ any address ]                       *
 *          page_count = # of pages   [ a page is 512 bytes ]               *
 *                                                                          *
 *      Note does not return spare array data                               *
 *                                                                          *
 *      Returns:    0   pass                                                *
 *                  1+  failed - bad pages                                  *
 *                 -1   timeout                                             *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 EVMDM6437_NANDFLASH_readPage( Uint32 src, Uint32 dst, Uint32 page_count )
{
    Uint32 i, j;
    volatile Uint8* dst8 = ( volatile Uint8* )dst;
    Uint8 spare[NAND_SPARESIZE];

    #ifdef USE_ECC
        Uint32 computed_ecc;
        Uint8  spare_ecc[4];
        Uint32 spare_ecc32;
    #endif

    invalid_pg_count = 0;

    for ( i = 0 ; i < page_count ; i++ )
    {
      //NAND_ASSERT_CE( );              // Assert CE ( for CE-care devices )

        NAND_CMD( CMD_READ );           // Read page
        NAND_ADDR_4( src );

        if ( _NAND_busywait( nand_timeout ) )
        {
          //NAND_DEASSERT_CE( );        // Deassert CE ( for CE-care devices )
            return NAND_ERR_TIMEOUT;    // Timeout Error
        }

        #ifdef USE_ECC
            _NAND_startECC( );          // Start ECC
        #endif

        j = NAND_PAGESIZE;
        while ( j-- )
            *dst8++ = NAND_DATA;        // Read MAIN array

        #ifdef USE_ECC
            computed_ecc = _NAND_readECC( ); // Read computed ECC
            computed_ecc &= 0x0FFF0FFF;
        #endif

        for ( j = 0 ; j < NAND_SPARESIZE ; j++ )
            spare[j] = NAND_DATA;       // Read SPARE leftovers

        #ifdef USE_ECC
            for ( j = 0 ; j < 4 ; j++ )
                spare_ecc[j] = spare[j];// Read SPARE ECC

            spare_ecc32 = *( Uint32* )( &spare_ecc[0] );
            spare_ecc32 &= 0x0FFF0FFF;

            if ( spare_ecc32 != computed_ecc )// Compare ECCs
                invalid_pgs[invalid_pg_count++] = src;
        #endif

      //NAND_DEASSERT_CE( );            // Deassert CE ( for CE-care devices )

        src += NAND_PAGESIZE;           // Increment address
    }

    return invalid_pg_count;
}

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  _NANDFLASH_writePage( src, dst, page_count )                            *
 *                                                                          *
 *      Program NAND Flash.                                                 *
 *          src = source address      [ any address ]                       *
 *          dst = destination address [ must be aligned to start of page ]  *
 *          page_count = # of pages   [ a page is 512 bytes ]               *
 *                                                                          *
 *      Note does not program SPARE arrays                                  *
 *                                                                          *
 *      Returns:    0   pass                                                *
 *                  1+  failed - bad pages                                  *
 *                 -1   timeout                                             *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 EVMDM6437_NANDFLASH_writePage( Uint32 src, Uint32 dst, Uint32 page_count )
{
    Uint32 i, j = 0;
    volatile Uint8* src8 = ( volatile Uint8* )src;

    #ifdef USE_ECC
        Uint32 computed_ecc;
    #endif

    invalid_pg_count = 0;

    for ( i = 0 ; i < page_count ; i++ )
    {
      //NAND_ASSERT_CE( );              // Assert CE ( for CE-care devices )

        NAND_CMD( CMD_PROGRAM );        // Program page
        NAND_ADDR_4( dst );

        #ifdef USE_ECC
            _NAND_startECC( );          // Start ECC calculation
        #endif

        j = NAND_PAGESIZE;
        while ( j-- )                   // Write MAIN array
            NAND_DATA = *src8++;

        #ifdef USE_ECC
            computed_ecc = _NAND_readECC( ); // Read computed ECC
            computed_ecc &= 0x0FFF0FFF;

            NAND_DATA = ( computed_ecc >> 24 );
            NAND_DATA = ( computed_ecc >> 16 );
            NAND_DATA = ( computed_ecc >> 8 );
            NAND_DATA = ( computed_ecc );

            j = NAND_SPARESIZE - 4;
        #else
            j = NAND_SPARESIZE;
        #endif

        while ( j-- );                  // Write Spare array
            NAND_DATA = 0xFF;        

        NAND_CMD( CMD_PROGRAM_CONFIRM );// Confirm Program

        if ( _NAND_busywait( nand_timeout ) )
        {
          //NAND_DEASSERT_CE( );        // Deassert CE ( for CE-care devices )
            return NAND_ERR_TIMEOUT;    // Timeout Error
        }

        NAND_CMD( CMD_STATUS );         // Check Status

        if ( NAND_DATA & CMD_STATUS_ERROR )
            invalid_pgs[invalid_pg_count++] = dst;

      //NAND_DEASSERT_CE( );            // Deassert CE ( for CE-care devices )

        dst += NAND_PAGESIZE;           // Increment address
    }

    return invalid_pg_count;
}