filename | src/maple/maple.c |
changeset | 850:28782ebbd01d |
prev | 838:9abb2fa58934 |
next | 1034:7044e01148f0 |
author | nkeynes |
date | Mon Jun 08 04:12:21 2009 +0000 (14 years ago) |
permissions | -rw-r--r-- |
last change | General cleanup of the GD-rom subsystem - merge gdrom_image_t and gdrom_disc_t - Abstract MMC devices using a lower-level scsi transport - OSX: only look at the whole disc device, and ignore partitions |
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1 /**
2 * $Id$
3 *
4 * Implements the core Maple bus, including DMA transfers to and from the bus.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
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.
12 *
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.
17 */
18 #define MODULE maple_module
20 #include <assert.h>
21 #include <glib/gstrfuncs.h>
22 #include "dream.h"
23 #include "mem.h"
24 #include "asic.h"
25 #include "maple.h"
27 void maple_init( void );
29 struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,
30 NULL, NULL, NULL };
32 struct maple_device_class *maple_device_classes[] = {
33 &controller_class, &keyboard_class, &lightgun_class, &mouse_class, NULL };
35 void maple_init( void )
36 {
38 }
40 maple_device_t maple_new_device( const gchar *name )
41 {
42 maple_device_class_t clz = maple_get_device_class(name);
43 if( clz != NULL ) {
44 return clz->new_device();
45 }
46 return NULL;
47 }
49 maple_device_class_t maple_get_device_class( const gchar *name )
50 {
51 int i;
52 for( i=0; maple_device_classes[i] != NULL; i++ ) {
53 if( g_strcasecmp(maple_device_classes[i]->name, name ) == 0 )
54 return maple_device_classes[i];
55 }
56 return NULL;
57 }
59 const struct maple_device_class **maple_get_device_classes()
60 {
61 return (const struct maple_device_class **)maple_device_classes;
62 }
64 lxdream_config_entry_t maple_get_device_config( maple_device_t dev )
65 {
66 if( dev->get_config == NULL )
67 return NULL;
68 return dev->get_config(dev);
69 }
71 /**
72 * Input data looks like this:
73 * 0: transfer control word
74 * 0: length of data in words (not including 3 word header)
75 * 1: low bit = lightgun mode
76 * 2: low 2 bits = port # (0..3)
77 * 3: 0x80 = last packet, 0x00 = normal packet
78 * 4: output buffer address
79 * 8: Command word
80 * 8: command code
81 * 9: destination address
82 * 10: source address
83 * 11: length of data in words (not including 3 word header)
84 * 12: command-specific data
85 */
87 /**
88 * array is [port][subperipheral], so [0][0] is main peripheral on port A,
89 * [1][2] is the second subperipheral on port B and so on.
90 */
91 maple_device_t maple_devices[4][6];
92 int maple_periph_mask[4];
93 #define GETBYTE(n) ((uint32_t)(buf[n]))
94 #define GETWORD(n) (*((uint32_t *)(buf+(n))))
95 #define PUTBYTE(n,x) (buf[n] = (char)x)
96 #define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))
98 maple_device_t maple_get_device( unsigned int port, unsigned int periph ) {
99 if( port >= 4 )
100 return NULL;
101 if( periph >= 6 )
102 return NULL;
103 return maple_devices[port][periph];
104 }
106 void maple_handle_buffer( uint32_t address ) {
107 unsigned char *buf = (unsigned char *)mem_get_region(address);
108 if( buf == NULL ) {
109 ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );
110 } else {
111 unsigned int last = 0;
112 int i = 0, count;
113 for( count=0; !last; count++ ) {
114 unsigned int port, length, mode, periph, periph_id, out_length;
115 unsigned int cmd, recv_addr, send_addr;
116 uint32_t return_addr;
117 unsigned char *return_buf;
118 maple_device_t dev;
120 last = GETBYTE(3) & 0x80; /* indicates last packet */
121 port = GETBYTE(2) & 0x03;
122 mode = GETBYTE(1) & 0x07;
123 length = GETBYTE(0) & 0xFF;
124 return_addr = GETWORD(4);
126 switch( mode ) {
127 case 2: /* lightgun */
128 dev = maple_devices[port][0];
129 if( dev != NULL && dev->start_gun != NULL ) {
130 dev->start_gun(dev);
131 return; // Pending
132 } else {
133 asic_event( EVENT_MAPLE_DMA );
134 return;
135 }
136 case 7: /* skip */
137 buf += 4;
138 address +=4;
139 continue;
140 }
141 if( (return_addr & 0x1C000000) != 0x0C000000 ) {
142 ERROR( "Bad return address in maple packet: %08X", return_addr );
143 break;
144 }
145 return_buf = mem_get_region(return_addr);
146 cmd = GETBYTE(8);
147 recv_addr = GETBYTE(9);
148 send_addr = GETBYTE(10);
149 /* Sanity checks */
150 if( GETBYTE(11) != length ||
151 send_addr >> 6 != port ||
152 recv_addr >> 6 != port ||
153 return_buf == NULL ) {
154 ERROR( "Received bad packet: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
155 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
156 buf[8], buf[9], buf[10], buf[11] );
157 break;
158 }
159 periph = 0;
160 periph_id = recv_addr & 0x3F;
161 if( periph_id != 0x20 ) {
162 for( i=0;i<5;i++ ) {
163 if( periph_id == (1<<i) ) {
164 periph = i+1;
165 break;
166 }
167 }
168 if( periph == 0 ) { /* Bad setting */
169 /* ERROR */
170 }
171 }
173 dev = maple_devices[port][periph];
174 if( dev == NULL ) {
175 /* no device attached */
176 *((uint32_t *)return_buf) = -1;
177 } else {
178 int status, func, block;
179 out_length = 0;
180 switch( cmd ) {
181 case MAPLE_CMD_INFO:
182 status = MAPLE_RESP_INFO;
183 memcpy( return_buf+4, dev->ident, 112 );
184 out_length = 0x1C;
185 break;
186 case MAPLE_CMD_EXT_INFO:
187 status = MAPLE_RESP_EXT_INFO;
188 memcpy( return_buf+4, dev->ident, 192 );
189 out_length = 0x30;
190 break;
191 case MAPLE_CMD_RESET:
192 if( dev->reset == NULL )
193 status = MAPLE_RESP_ACK;
194 else status = dev->reset(dev);
195 break;
196 case MAPLE_CMD_SHUTDOWN:
197 if( dev->shutdown == NULL )
198 status = MAPLE_RESP_ACK;
199 else status = dev->shutdown(dev);
200 break;
201 case MAPLE_CMD_GET_COND:
202 func = GETWORD(12);
203 if( dev->get_condition == NULL )
204 status = MAPLE_ERR_CMD_UNKNOWN;
205 else status = dev->get_condition(dev, func,
206 return_buf+8,
207 &out_length );
208 if( status == 0 ) {
209 out_length++;
210 status = MAPLE_RESP_DATA;
211 PUTWORD(4,func);
212 }
213 break;
214 case MAPLE_CMD_SET_COND:
215 func = GETWORD(12);
216 if( dev->set_condition == NULL )
217 status = MAPLE_ERR_CMD_UNKNOWN;
218 else status = dev->set_condition(dev, func,
219 buf+16,
220 length);
221 if( status == 0 )
222 status = MAPLE_RESP_ACK;
223 break;
224 case MAPLE_CMD_READ_BLOCK:
225 func = GETWORD(12);
226 block = GETWORD(16);
227 if( dev->read_block == NULL )
228 status = MAPLE_ERR_CMD_UNKNOWN;
229 else status = dev->read_block(dev, func, block,
230 return_buf+12,
231 &out_length );
232 if( status == 0 ) {
233 status = MAPLE_RESP_DATA;
234 PUTWORD(4,func);
235 PUTWORD(8,block);
236 }
237 break;
238 case MAPLE_CMD_WRITE_BLOCK:
239 func = GETWORD(12);
240 block = GETWORD(16);
241 if( dev->write_block == NULL )
242 status = MAPLE_ERR_CMD_UNKNOWN;
243 else {
244 status = dev->write_block(dev, func, block,
245 buf+20, length);
246 if( status == 0 )
247 status = MAPLE_RESP_ACK;
248 }
249 break;
250 default:
251 status = MAPLE_ERR_CMD_UNKNOWN;
252 }
253 return_buf[0] = status;
254 return_buf[1] = send_addr;
255 return_buf[2] = recv_addr;
256 if( periph == 0 )
257 return_buf[2] |= maple_periph_mask[port];
258 return_buf[3] = out_length;
259 }
260 buf += 12 + (length<<2);
261 address += 12 + (length<<2);
262 }
263 asic_event( EVENT_MAPLE_DMA );
264 }
265 }
267 void maple_attach_device( maple_device_t dev, unsigned int port,
268 unsigned int periph ) {
269 assert( port < 4 );
270 assert( periph < 6 );
272 if( maple_devices[port][periph] != NULL ) {
273 /* Detach existing peripheral first */
274 maple_detach_device( port, periph );
275 }
277 maple_devices[port][periph] = dev;
278 if( periph != 0 )
279 maple_periph_mask[port] |= (1<<(periph-1));
280 else maple_periph_mask[port] |= 0x20;
281 if( dev->attach != NULL ) {
282 dev->attach( dev );
283 }
284 }
286 void maple_detach_device( unsigned int port, unsigned int periph ) {
287 assert( port < 4 );
288 assert( periph < 6 );
290 maple_device_t dev = maple_devices[port][periph];
291 if( dev == NULL ) /* already detached */
292 return;
293 maple_devices[port][periph] = NULL;
294 if( dev->detach != NULL ) {
295 dev->detach(dev);
296 }
297 if( dev->destroy != NULL ) {
298 dev->destroy(dev);
299 }
300 if( periph == 0 ) {
301 /* If we detach the main peripheral, we also have to detach all the
302 * subperipherals, or the system could get quite confused
303 */
304 int i;
305 maple_periph_mask[port] = 0;
306 for( i=1; i<6; i++ ) {
307 maple_detach_device(port,i);
308 }
309 } else {
310 maple_periph_mask[port] &= (~(1<<(periph-1)));
311 }
313 }
315 void maple_detach_all() {
316 int i, j;
317 for( i=0; i<4; i++ ) {
318 for( j=0; j<6; j++ ) {
319 if( maple_devices[i][j] != NULL ) {
320 maple_device_t dev = maple_devices[i][j];
321 if( dev->detach != NULL )
322 dev->detach(dev);
323 if( dev->destroy != NULL )
324 dev->destroy(dev);
325 }
326 }
327 maple_periph_mask[i] = 0;
328 }
329 }
331 void maple_reattach_all()
332 {
333 int i, j;
334 for( i=0; i<4; i++ ) {
335 for( j=0; j<6; j++ ) {
336 if( maple_devices[i][j] != NULL ) {
337 maple_device_t dev = maple_devices[i][j];
338 if( dev->detach != NULL )
339 dev->detach(dev);
340 if( dev->attach != NULL )
341 dev->attach(dev);
342 }
343 }
344 }
345 }
347 gboolean maple_should_grab()
348 {
349 int mode = MAPLE_GRAB_DONTCARE;
350 int i,j;
351 for( i=0; i<4; i++ ) {
352 for( j=0; j<6; j++ ) {
353 if( maple_devices[i][j] != NULL ) {
354 maple_device_t dev = maple_devices[i][j];
355 if( dev->grab_mode > mode ) {
356 mode = dev->grab_mode;
357 }
358 }
359 }
360 }
361 return mode == MAPLE_GRAB_YES;
362 }
364 void maple_set_device_config_value( maple_device_t dev, unsigned int key, const gchar *value )
365 {
366 if( dev != NULL && dev->set_config_value != NULL ) {
367 dev->set_config_value( dev, key, value );
368 }
369 }
371 void maple_default_destroy( maple_device_t mdev )
372 {
373 free(mdev);
374 }
.