/**

 * $Id$

 * 

 * Miscellaneous and not-really-implemented SH4 peripheral modules. Also

 * responsible for including the IMPL side of the SH4 MMIO pages.

 * Most of these will eventually be split off into their own files.

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * 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.

 */

#define MODULE sh4_module

#include "dream.h"

#include "dreamcast.h"

#include "mem.h"

#include "clock.h"

#include "sh4/sh4core.h"

#include "sh4/sh4mmio.h"

#define MMIO_IMPL

#include "sh4/sh4mmio.h"

/********************************* BSC *************************************/

uint32_t bsc_input = 0x0300;

uint16_t bsc_read_pdtra()

{

    int i;

    uint32_t pctra = MMIO_READ( BSC, PCTRA );

    uint16_t output = MMIO_READ( BSC, PDTRA );

    uint16_t input_mask = 0, output_mask = 0;

    for( i=0; i<16; i++ ) {

        int bits = (pctra >> (i<<1)) & 0x03;

        if( bits == 2 ) input_mask |= (1<<i);

        else if( bits != 0 ) output_mask |= (1<<i);

    }

    /* ??? */

    if( ((output | (~output_mask)) & 0x03) == 3 ) {

        output |= 0x03;

    } else {

        output &= ~0x03;

    }

    return (bsc_input & input_mask) | output;

}

uint32_t bsc_read_pdtrb()

{

    int i;

    uint32_t pctrb = MMIO_READ( BSC, PCTRB );

    uint16_t output = MMIO_READ( BSC, PDTRB );

    uint16_t input_mask = 0, output_mask = 0;

    for( i=0; i<4; i++ ) {

        int bits = (pctrb >> (i<<1)) & 0x03;

        if( bits == 2 ) input_mask |= (1<<i);

        else if( bits != 0 ) output_mask |= (1<<i);

    }

    return ((bsc_input>>16) & input_mask) | output;

}

MMIO_REGION_WRITE_DEFFN(BSC)

int32_t mmio_region_BSC_read( uint32_t reg )

{

    int32_t val;

    switch( reg ) {

    case PDTRA:

        val = bsc_read_pdtra();

        break;

    case PDTRB:

        val = bsc_read_pdtrb();

        break;

    default:

        val = MMIO_READ( BSC, reg );

    }

    return val;

}

/********************************* UBC *************************************/

int32_t mmio_region_UBC_read( uint32_t reg )

{

    return MMIO_READ( UBC, reg );

}

void mmio_region_UBC_write( uint32_t reg, uint32_t val )

{

    switch( reg ) {

    case BAMRA:

    case BAMRB:

        val &= 0x0F;

        break;

    case BBRA:

    case BBRB:

        val &= 0x07F;

        if( val != 0 ) { 

            WARN( "UBC not implemented" );

        }

        break;

    case BRCR:

        val &= 0xC4C9;

        break;

    }

    MMIO_WRITE( UBC, reg, val );

}

/********************************** SCI *************************************/

MMIO_REGION_STUBFNS( SCI )