/**

  * $Id: aica.c,v 1.9 2005-12-26 11:52:56 nkeynes Exp $

  * 

  * This is the core sound system (ie the bit which does the actual work)

  *

  * 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 aica_module

 #include "dream.h"

 #include "mem.h"

 #include "aica.h"

 #define MMIO_IMPL

 #include "aica.h"

 MMIO_REGION_READ_DEFFN( AICA0 )

 MMIO_REGION_READ_DEFFN( AICA1 )

 MMIO_REGION_READ_DEFFN( AICA2 )

 void aica_init( void );

 void aica_reset( void );

 void aica_start( void );

 void aica_stop( void );

 void aica_save_state( FILE *f );

 int aica_load_state( FILE *f );

 uint32_t aica_run_slice( uint32_t );

 struct dreamcast_module aica_module = { "AICA", aica_init, aica_reset, 

 					aica_start, aica_run_slice, aica_stop,

 					aica_save_state, aica_load_state };

 /**

  * Initialize the AICA subsystem. Note requires that 

  */

 void aica_init( void )

 {

     register_io_regions( mmio_list_spu );

     MMIO_NOTRACE(AICA0);

     MMIO_NOTRACE(AICA1);

     arm_mem_init();

     arm_reset();

 }

 void aica_reset( void )

 {

     arm_reset();

 }

 void aica_start( void )

 {

 }

 uint32_t aica_run_slice( uint32_t nanosecs )

 {

     /* Run arm instructions */

     int reset = MMIO_READ( AICA2, AICA_RESET );

     if( (reset & 1) == 0 ) { 

 	/* Running */

         nanosecs = arm_run_slice( nanosecs );

     }

     /* Generate audio buffer */

     return nanosecs;

 }

 void aica_stop( void )

 {

 }

 void aica_save_state( FILE *f )

 {

     arm_save_state( f );

 }

 int aica_load_state( FILE *f )

 {

     return arm_load_state( f );

 }

 /** Channel register structure:

  * 00  4  Channel config

  * 04  4  Waveform address lo (16 bits)

  * 08  4  Loop start address

  * 0C  4  Loop end address

  * 10  4  Volume envelope

  * 14  4  Init to 0x1F

  * 18  4  Frequency (floating point)

  * 1C  4  ?? 

  * 20  4  ??

  * 24  1  Pan

  * 25  1  ??

  * 26  

  * 27  

  * 28  1  ??

  * 29  1  Volume

  * 2C

  * 30

  * 

 /* Write to channels 0-31 */

 void mmio_region_AICA0_write( uint32_t reg, uint32_t val )

 {

     //    aica_write_channel( reg >> 7, reg % 128, val );

     MMIO_WRITE( AICA0, reg, val );

     //    DEBUG( "AICA0 Write %08X => %08X", val, reg );

 }

 /* Write to channels 32-64 */

 void mmio_region_AICA1_write( uint32_t reg, uint32_t val )

 {

     //    aica_write_channel( (reg >> 7) + 32, reg % 128, val );

     MMIO_WRITE( AICA1, reg, val );

     // DEBUG( "AICA1 Write %08X => %08X", val, reg );

 }

 /* General registers */

 void mmio_region_AICA2_write( uint32_t reg, uint32_t val )

 {

     uint32_t tmp;

     switch( reg ) {

     case AICA_RESET:

 	tmp = MMIO_READ( AICA2, AICA_RESET );

 	if( (tmp & 1) == 1 && (val & 1) == 0 ) {

 	    /* ARM enabled - execute a core reset */

 	    DEBUG( "ARM enabled" );

 	    arm_reset();

 	} else if( (tmp&1) == 0 && (val&1) == 1 ) {

 	    DEBUG( "ARM disabled" );

 	}

 	MMIO_WRITE( AICA2, AICA_RESET, val );

 	break;

     default:

 	MMIO_WRITE( AICA2, reg, val );

 	break;

     }

 }