2 * $Id: maple.c,v 1.9 2006-06-15 10:33:05 nkeynes Exp $
4 * Implements the core Maple bus, including DMA transfers to and from the bus.
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 #define MODULE maple_module
26 void maple_init( void );
28 struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,
31 struct maple_device_class *maple_device_classes[] = { &controller_class, NULL };
33 void maple_init( void )
38 maple_device_t maple_new_device( const gchar *name )
41 for( i=0; maple_device_classes[i] != NULL; i++ ) {
42 if( g_strcasecmp(maple_device_classes[i]->name, name ) == 0 )
43 return maple_device_classes[i]->new_device();
48 dreamcast_config_entry_t maple_get_device_config( maple_device_t dev )
50 if( dev->get_config == NULL )
52 return dev->get_config(dev);
56 * Input data looks like this:
57 * 0: transfer control word
58 * 0: length of data in words (not including 3 word header)
59 * 1: low bit = lightgun mode
60 * 2: low 2 bits = port # (0..3)
61 * 3: 0x80 = last packet, 0x00 = normal packet
62 * 4: output buffer address
65 * 9: destination address
67 * 11: length of data in words (not including 3 word header)
68 * 12: command-specific data
72 * array is [port][subperipheral], so [0][0] is main peripheral on port A,
73 * [1][2] is the second subperipheral on port B and so on.
75 maple_device_t maple_devices[4][6];
76 int maple_periph_mask[4];
77 #define GETBYTE(n) ((uint32_t)(buf[n]))
78 #define GETWORD(n) (*((uint32_t *)(buf+(n))))
79 #define PUTBYTE(n,x) (buf[n] = (char)x)
80 #define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))
82 maple_device_t maple_get_device( unsigned int port, unsigned int periph ) {
87 return maple_devices[port][periph];
90 void maple_handle_buffer( uint32_t address ) {
91 unsigned char *buf = (unsigned char *)mem_get_region(address);
93 ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );
95 unsigned int last = 0;
97 for( count=0; !last; count++ ) {
98 unsigned int port, length, gun, periph, periph_id, out_length;
99 unsigned int cmd, recv_addr, send_addr;
100 uint32_t return_addr;
101 unsigned char *return_buf;
103 last = GETBYTE(3) & 0x80; /* indicates last packet */
104 port = GETBYTE(2) & 0x03;
105 gun = GETBYTE(1) & 0x01;
106 length = GETBYTE(0) & 0xFF;
107 return_addr = GETWORD(4);
108 if( return_addr == 0 ) {
111 return_buf = mem_get_region(return_addr);
113 recv_addr = GETBYTE(9);
114 send_addr = GETBYTE(10);
116 if( GETBYTE(11) != length ||
117 send_addr != (port<<6) ||
118 recv_addr >> 6 != port ||
119 return_buf == NULL ) {
123 periph_id = recv_addr & 0x3F;
124 if( periph_id != 0x20 ) {
126 if( periph_id == (1<<i) ) {
131 if( periph == 0 ) { /* Bad setting */
136 maple_device_t dev = maple_devices[port][periph];
138 /* no device attached */
139 *((uint32_t *)return_buf) = -1;
141 int status, func, block;
145 status = MAPLE_RESP_INFO;
146 memcpy( return_buf+4, dev->ident, 112 );
149 case MAPLE_CMD_EXT_INFO:
150 status = MAPLE_RESP_EXT_INFO;
151 memcpy( return_buf+4, dev->ident, 192 );
154 case MAPLE_CMD_RESET:
155 if( dev->reset == NULL )
156 status = MAPLE_RESP_ACK;
157 else status = dev->reset(dev);
159 case MAPLE_CMD_SHUTDOWN:
160 if( dev->shutdown == NULL )
161 status = MAPLE_RESP_ACK;
162 else status = dev->shutdown(dev);
164 case MAPLE_CMD_GET_COND:
166 if( dev->get_condition == NULL )
167 status = MAPLE_ERR_CMD_UNKNOWN;
168 else status = dev->get_condition(dev, func,
173 status = MAPLE_RESP_DATA;
177 case MAPLE_CMD_SET_COND:
179 if( dev->set_condition == NULL )
180 status = MAPLE_ERR_CMD_UNKNOWN;
181 else status = dev->set_condition(dev, func,
185 status = MAPLE_RESP_ACK;
187 case MAPLE_CMD_READ_BLOCK:
190 if( dev->read_block == NULL )
191 status = MAPLE_ERR_CMD_UNKNOWN;
192 else status = dev->read_block(dev, func, block,
196 status = MAPLE_RESP_DATA;
201 case MAPLE_CMD_WRITE_BLOCK:
204 if( dev->write_block == NULL )
205 status = MAPLE_ERR_CMD_UNKNOWN;
207 status = dev->write_block(dev, func, block,
210 status = MAPLE_RESP_ACK;
214 status = MAPLE_ERR_CMD_UNKNOWN;
216 return_buf[0] = status;
217 return_buf[1] = send_addr;
218 return_buf[2] = recv_addr;
220 return_buf[2] |= maple_periph_mask[port];
221 return_buf[3] = out_length;
223 buf += 12 + (length<<2);
225 asic_event( EVENT_MAPLE_DMA );
229 void maple_attach_device( maple_device_t dev, unsigned int port,
230 unsigned int periph ) {
232 assert( periph < 6 );
234 if( maple_devices[port][periph] != NULL ) {
235 /* Detach existing peripheral first */
236 maple_detach_device( port, periph );
239 maple_devices[port][periph] = dev;
241 maple_periph_mask[port] |= (1<<(periph-1));
242 else maple_periph_mask[port] |= 0x20;
243 if( dev->attach != NULL ) {
248 void maple_detach_device( unsigned int port, unsigned int periph ) {
250 assert( periph < 6 );
252 maple_device_t dev = maple_devices[port][periph];
253 if( dev == NULL ) /* already detached */
255 maple_devices[port][periph] = NULL;
256 if( dev->detach != NULL ) {
260 /* If we detach the main peripheral, we also have to detach all the
261 * subperipherals, or the system could get quite confused
264 maple_periph_mask[port] = 0;
265 for( i=1; i<6; i++ ) {
266 maple_detach_device(port,i);
269 maple_periph_mask[port] &= (~(1<<(periph-1)));
274 void maple_detach_all() {
276 for( i=0; i<4; i++ ) {
277 for( j=0; j<6; j++ ) {
278 if( maple_devices[i][j] != NULL ) {
279 maple_device_t dev = maple_devices[i][j];
280 if( dev->detach != NULL )
282 if( dev->destroy != NULL )
286 maple_periph_mask[i] = 0;
290 void maple_reattach_all() {
292 for( i=0; i<4; i++ ) {
293 for( j=0; j<6; j++ ) {
294 if( maple_devices[i][j] != NULL ) {
295 maple_device_t dev = maple_devices[i][j];
296 if( dev->attach != NULL )
.