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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 561:533f6b478071
prev494:67c133a17400
next608:4f588e52bce0
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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nkeynes@31
     1
/**
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 * $Id$
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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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     9
 * it under the terms of the GNU General Public License as published by
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    10
 * 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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#define MODULE maple_module
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#include <assert.h>
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#include <glib/gstrfuncs.h>
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#include "dream.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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struct maple_device_class *maple_device_classes[] = { &controller_class, NULL };
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void maple_init( void )
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{
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}
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maple_device_t maple_new_device( const gchar *name )
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{
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    maple_device_class_t clz = maple_get_device_class(name);
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    if( clz != NULL ) {
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	return clz->new_device();
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    } 
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    return NULL;
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}
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maple_device_class_t maple_get_device_class( const gchar *name )
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{
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    int i;
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    for( i=0; maple_device_classes[i] != NULL; i++ ) {
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	if( g_strcasecmp(maple_device_classes[i]->name, name ) == 0 )
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	    return maple_device_classes[i];
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    }
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    return NULL;
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}
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const struct maple_device_class **maple_get_device_classes()
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{
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    return (const struct maple_device_class **)maple_device_classes;
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}
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lxdream_config_entry_t maple_get_device_config( maple_device_t dev )
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{
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    if( dev->get_config == NULL )
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	return NULL;
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    return dev->get_config(dev);
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}
nkeynes@144
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nkeynes@2
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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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maple_device_t maple_get_device( unsigned int port, unsigned int periph ) {
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    if( port >= 4 )
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	return NULL;
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    if( periph >= 6 )
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	return NULL;
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    return maple_devices[port][periph];
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}
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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, mode, 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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            mode = GETBYTE(1) & 0x07;
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            length = GETBYTE(0) & 0xFF;
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            return_addr = GETWORD(4);
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	    if( mode == 0x07 ) {
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		buf += 4;
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		address +=4; /* skip? */
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		continue;
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	    }
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            if( (return_addr & 0x1C000000) != 0x0C000000 ) {
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		ERROR( "Bad return address in maple packet: %08X", return_addr );
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		break;
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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 >> 6 != port ||
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                recv_addr >> 6 != port ||
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                return_buf == NULL ) {
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		ERROR( "Received bad packet: %02X %02X %02X %02X  %02X %02X %02X %02X  %02X %02X %02X %02X",
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		       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
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		       buf[8], buf[9], buf[10], buf[11] );
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		break;
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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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            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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			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);
nkeynes@2
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                        if( dev->write_block == NULL )
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                            status = MAPLE_ERR_CMD_UNKNOWN;
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   231
                        else {
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   232
                            status = dev->write_block(dev, func, block, 
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   233
                                                      buf+20, length);
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                            if( status == 0 )
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                                status = MAPLE_RESP_ACK;
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   236
                        }
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   237
                        break;
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                    default:
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   239
                        status = MAPLE_ERR_CMD_UNKNOWN;
nkeynes@2
   240
                }
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   241
                return_buf[0] = status;
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   242
                return_buf[1] = send_addr;
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   243
                return_buf[2] = recv_addr;
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   244
                if( periph == 0 )
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   245
                    return_buf[2] |= maple_periph_mask[port];
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   246
                return_buf[3] = out_length;
nkeynes@2
   247
            }
nkeynes@2
   248
            buf += 12 + (length<<2);
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   249
	    address += 12 + (length<<2);
nkeynes@2
   250
        }
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   251
        asic_event( EVENT_MAPLE_DMA );
nkeynes@1
   252
    }
nkeynes@1
   253
}
nkeynes@2
   254
nkeynes@2
   255
void maple_attach_device( maple_device_t dev, unsigned int port,
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   256
                          unsigned int periph ) {
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   257
    assert( port < 4 );
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    assert( periph < 6 );
nkeynes@2
   259
nkeynes@2
   260
    if( maple_devices[port][periph] != NULL ) {
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   261
        /* Detach existing peripheral first */
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   262
        maple_detach_device( port, periph );
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   263
    }
nkeynes@2
   264
    
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   265
    maple_devices[port][periph] = dev;
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   266
    if( periph != 0 )
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   267
        maple_periph_mask[port] |= (1<<(periph-1));
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   268
    else maple_periph_mask[port] |= 0x20;
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   269
    if( dev->attach != NULL ) {
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   270
        dev->attach( dev );
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   271
    }
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   272
}
nkeynes@2
   273
nkeynes@2
   274
void maple_detach_device( unsigned int port, unsigned int periph ) {
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   275
    assert( port < 4 );
nkeynes@2
   276
    assert( periph < 6 );
nkeynes@2
   277
nkeynes@2
   278
    maple_device_t dev = maple_devices[port][periph];
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   279
    if( dev == NULL ) /* already detached */
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   280
        return;
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   281
    maple_devices[port][periph] = NULL;
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   282
    if( dev->detach != NULL ) {
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   283
        dev->detach(dev);
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   284
    }
nkeynes@447
   285
    if( dev->destroy != NULL ) {
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   286
	dev->destroy(dev);
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   287
    }
nkeynes@2
   288
    if( periph == 0 ) {
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   289
        /* If we detach the main peripheral, we also have to detach all the
nkeynes@2
   290
         * subperipherals, or the system could get quite confused
nkeynes@2
   291
         */
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   292
        int i;
nkeynes@2
   293
        maple_periph_mask[port] = 0;
nkeynes@2
   294
        for( i=1; i<6; i++ ) {
nkeynes@2
   295
            maple_detach_device(port,i);
nkeynes@2
   296
        }
nkeynes@2
   297
    } else {
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   298
        maple_periph_mask[port] &= (~(1<<(periph-1)));
nkeynes@2
   299
    }
nkeynes@144
   300
    
nkeynes@2
   301
}
nkeynes@144
   302
nkeynes@144
   303
void maple_detach_all() {
nkeynes@144
   304
    int i, j;
nkeynes@144
   305
    for( i=0; i<4; i++ ) {
nkeynes@144
   306
	for( j=0; j<6; j++ ) {
nkeynes@144
   307
	    if( maple_devices[i][j] != NULL ) {
nkeynes@144
   308
		maple_device_t dev = maple_devices[i][j];
nkeynes@144
   309
		if( dev->detach != NULL )
nkeynes@144
   310
		    dev->detach(dev);
nkeynes@144
   311
		if( dev->destroy != NULL )
nkeynes@144
   312
		    dev->destroy(dev);
nkeynes@144
   313
	    }
nkeynes@144
   314
	}
nkeynes@144
   315
	maple_periph_mask[i] = 0;
nkeynes@144
   316
    }
nkeynes@144
   317
}
nkeynes@144
   318
nkeynes@144
   319
void maple_reattach_all() {
nkeynes@144
   320
    int i, j;
nkeynes@144
   321
    for( i=0; i<4; i++ ) {
nkeynes@144
   322
	for( j=0; j<6; j++ ) {
nkeynes@144
   323
	    if( maple_devices[i][j] != NULL ) {
nkeynes@144
   324
		maple_device_t dev = maple_devices[i][j];
nkeynes@144
   325
		if( dev->attach != NULL )
nkeynes@144
   326
		    dev->attach(dev);
nkeynes@144
   327
	    }
nkeynes@144
   328
	}
nkeynes@144
   329
    }
nkeynes@144
   330
}
.