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lxdream.org :: lxdream/src/maple/maple.c
lxdream 0.9.1
released Jun 29
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filename src/maple/maple.c
changeset 31:495e480360d7
prev23:1ec3acd0594d
next35:21a4be098304
author nkeynes
date Sun Dec 25 08:24:11 2005 +0000 (14 years ago)
permissions -rw-r--r--
last change Finish adding header blocks to all files
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/**
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 * $Id: maple.c,v 1.5 2005-12-25 08:24:11 nkeynes Exp $
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 *
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 * Implements the core Maple bus, including DMA transfers to and from the bus.
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include <assert.h>
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#include "dream.h"
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#include "modules.h"
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#include "mem.h"
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#include "asic.h"
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#include "maple.h"
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void maple_init( void );
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struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,
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					 NULL, NULL, NULL };
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void maple_init( void )
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{
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}
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/**
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 * Input data looks like this:
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 *    0: transfer control word
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 *      0: length of data in words (not including 3 word header)
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 *      1: low bit = lightgun mode
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 *      2: low 2 bits = port # (0..3)
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 *      3: 0x80 = last packet, 0x00 = normal packet
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 *    4: output buffer address
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 *    8: Command word
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 *      8: command code
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 *      9: destination address
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 *     10: source address
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 *     11: length of data in words (not including 3 word header)
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 *   12: command-specific data
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 */
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/**
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 * array is [port][subperipheral], so [0][0] is main peripheral on port A,
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 * [1][2] is the second subperipheral on port B and so on.
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 */
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maple_device_t maple_devices[4][6];
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int maple_periph_mask[4];
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#define GETBYTE(n) ((uint32_t)(buf[n]))
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#define GETWORD(n) (*((uint32_t *)(buf+(n))))
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#define PUTBYTE(n,x) (buf[n] = (char)x)
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#define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))
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void maple_handle_buffer( uint32_t address ) {
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    unsigned char *buf = (unsigned char *)mem_get_region(address);
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    if( buf == NULL ) {
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        ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );
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    } else {
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        unsigned int last = 0;
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        int i = 0, count;
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        for( count=0; !last; count++ ) {
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            unsigned int port, length, gun, periph, periph_id, out_length;
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            unsigned int cmd, recv_addr, send_addr;
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            uint32_t return_addr;
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            unsigned char *return_buf;
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            last = GETBYTE(3) & 0x80; /* indicates last packet */
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            port = GETBYTE(2) & 0x03;
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            gun = GETBYTE(1) & 0x01;
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            length = GETBYTE(0) & 0xFF;
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            return_addr = GETWORD(4);
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            if( return_addr == 0 ) {
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                /* ERROR */
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            }
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            return_buf = mem_get_region(return_addr);
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            cmd = GETBYTE(8);
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            recv_addr = GETBYTE(9);
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            send_addr = GETBYTE(10);
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            /* Sanity checks */
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            if( GETBYTE(11) != length ||
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                send_addr != (port<<6) ||
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                recv_addr >> 6 != port ||
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                return_buf == NULL ) {
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                /* ERROR */
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            }
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            periph = 0;
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            periph_id = recv_addr & 0x3F;
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            if( periph_id != 0x20 ) {
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                for( i=0;i<5;i++ ) {
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                    if( periph_id == (1<<i) ) {
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                        periph = i+1;
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                        break;
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                    }
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                }
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                if( periph == 0 ) { /* Bad setting */
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                    /* ERROR */
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                }
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            }
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            INFO( "Maple packet %d: Cmd %d on port %d device %d", count, cmd, port, periph );
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            maple_device_t dev = maple_devices[port][periph];
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            if( dev == NULL ) {
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                /* no device attached */
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                *((uint32_t *)return_buf) = -1;
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            } else {
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                int status, func, block;
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                out_length = 0;
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                switch( cmd ) {
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                    case MAPLE_CMD_INFO:
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                        status = MAPLE_RESP_INFO;
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                        memcpy( return_buf+4, dev->ident, 112 );
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                        out_length = 0x1C;
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                        break;
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                    case MAPLE_CMD_EXT_INFO:
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                        status = MAPLE_RESP_EXT_INFO;
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                        memcpy( return_buf+4, dev->ident, 192 );
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                        out_length = 0x30;
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                        break;
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                    case MAPLE_CMD_RESET:
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                        if( dev->reset == NULL )
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                            status = MAPLE_RESP_ACK;
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                        else status = dev->reset(dev);
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                        break;
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                    case MAPLE_CMD_SHUTDOWN:
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                        if( dev->shutdown == NULL )
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                            status = MAPLE_RESP_ACK;
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                        else status = dev->shutdown(dev);
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                        break;
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                    case MAPLE_CMD_GET_COND:
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                        func = GETWORD(12);
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                        if( dev->get_condition == NULL )
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                            status = MAPLE_ERR_CMD_UNKNOWN;
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                        else status = dev->get_condition(dev, func,
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                                                         return_buf+8,
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                                                         &out_length );
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                        if( status == 0 ) {
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                            status = MAPLE_RESP_DATA;
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                            PUTWORD(4,func);
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                        }
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                        break;
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                    case MAPLE_CMD_SET_COND:
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                        func = GETWORD(12);
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                        if( dev->set_condition == NULL )
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                            status = MAPLE_ERR_CMD_UNKNOWN;
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                        else status = dev->set_condition(dev, func,
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                                                         buf+16,
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                                                         length);
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                        if( status == 0 )
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                            status = MAPLE_RESP_ACK;
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                        break;
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                    case MAPLE_CMD_READ_BLOCK:
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                        func = GETWORD(12);
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                        block = GETWORD(16);
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                        if( dev->read_block == NULL )
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                            status = MAPLE_ERR_CMD_UNKNOWN;
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                        else status = dev->read_block(dev, func, block,
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                                                      return_buf+12,
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                                                      &out_length );
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                        if( status == 0 ) {
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                            status = MAPLE_RESP_DATA;
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                            PUTWORD(4,func);
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                            PUTWORD(8,block);
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                        }
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                        break;
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                    case MAPLE_CMD_WRITE_BLOCK:
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                        func = GETWORD(12);
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                        block = GETWORD(16);
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                        if( dev->write_block == NULL )
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                            status = MAPLE_ERR_CMD_UNKNOWN;
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                        else {
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                            status = dev->write_block(dev, func, block, 
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                                                      buf+20, length);
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                            if( status == 0 )
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                                status = MAPLE_RESP_ACK;
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                        }
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                        break;
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                    default:
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                        status = MAPLE_ERR_CMD_UNKNOWN;
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                }
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                return_buf[0] = status;
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                return_buf[1] = send_addr;
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                return_buf[2] = recv_addr;
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                if( periph == 0 )
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                    return_buf[2] |= maple_periph_mask[port];
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                return_buf[3] = out_length;
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            }
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            buf += 12 + (length<<2);
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        }
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        asic_event( EVENT_MAPLE_DMA );
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    }
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}
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void maple_attach_device( maple_device_t dev, unsigned int port,
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                          unsigned int periph ) {
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    assert( port < 4 );
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    assert( periph < 6 );
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    if( maple_devices[port][periph] != NULL ) {
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        /* Detach existing peripheral first */
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        maple_detach_device( port, periph );
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    }
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    maple_devices[port][periph] = dev;
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    if( periph != 0 )
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        maple_periph_mask[port] |= (1<<(periph-1));
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    else maple_periph_mask[port] |= 0x20;
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    if( dev->attach != NULL ) {
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        dev->attach( dev );
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    }
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}
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void maple_detach_device( unsigned int port, unsigned int periph ) {
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    assert( port < 4 );
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    assert( periph < 6 );
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    maple_device_t dev = maple_devices[port][periph];
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    if( dev == NULL ) /* already detached */
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        return;
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    maple_devices[port][periph] = NULL;
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    if( dev->detach != NULL ) {
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        dev->detach(dev);
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    }
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    if( periph == 0 ) {
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        /* If we detach the main peripheral, we also have to detach all the
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         * subperipherals, or the system could get quite confused
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         */
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        int i;
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        maple_periph_mask[port] = 0;
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        for( i=1; i<6; i++ ) {
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            maple_detach_device(port,i);
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        }
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    } else {
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        maple_periph_mask[port] &= (~(1<<(periph-1)));
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    }
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}
.