cc68a136 |
1 | #include <stdio.h>\r |
2 | #include <stdlib.h>\r |
3 | #include <string.h>\r |
4 | #include <unistd.h>\r |
5 | #include <sys/mman.h>\r |
6 | #include <sys/ioctl.h>\r |
7 | #include <fcntl.h>\r |
8 | #include <errno.h>\r |
9 | \r |
10 | #include "940shared.h"\r |
11 | #include "gp2x.h"\r |
12 | #include "emu.h"\r |
13 | #include "menu.h"\r |
14 | #include "asmutils.h"\r |
15 | \r |
16 | /* we will need some gp2x internals here */\r |
17 | extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r |
18 | extern volatile unsigned long *gp2x_memregl;\r |
19 | \r |
20 | static unsigned char *shared_mem = 0;\r |
21 | static _940_data_t *shared_data = 0;\r |
22 | static _940_ctl_t *shared_ctl = 0;\r |
23 | \r |
24 | int crashed_940 = 0;\r |
25 | \r |
26 | \r |
27 | /***********************************************************/\r |
28 | \r |
29 | #define MAXOUT (+32767)\r |
30 | #define MINOUT (-32768)\r |
31 | \r |
32 | /* limitter */\r |
33 | #define Limit(val, max,min) { \\r |
34 | if ( val > max ) val = max; \\r |
35 | else if ( val < min ) val = min; \\r |
36 | }\r |
37 | \r |
38 | /* these will be managed locally on our side */\r |
39 | extern int *ym2612_dacen;\r |
40 | extern INT32 *ym2612_dacout;\r |
41 | extern void *ym2612_regs;\r |
42 | \r |
43 | static UINT8 *REGS = 0; /* we will also keep local copy of regs for savestates and such */\r |
44 | static INT32 addr_A1; /* address line A1 */\r |
45 | static int dacen;\r |
46 | static INT32 dacout;\r |
47 | static UINT8 ST_address; /* address register */\r |
48 | static UINT8 ST_status; /* status flag */\r |
49 | static UINT8 ST_mode; /* mode CSM / 3SLOT */\r |
50 | static int ST_TA; /* timer a */\r |
51 | static int ST_TAC; /* timer a maxval */\r |
52 | static int ST_TAT; /* timer a ticker */\r |
53 | static UINT8 ST_TB; /* timer b */\r |
54 | static int ST_TBC; /* timer b maxval */\r |
55 | static int ST_TBT; /* timer b ticker */\r |
56 | \r |
57 | static int writebuff_ptr = 0;\r |
58 | \r |
59 | \r |
60 | /* OPN Mode Register Write */\r |
61 | static void set_timers( int v )\r |
62 | {\r |
63 | /* b7 = CSM MODE */\r |
64 | /* b6 = 3 slot mode */\r |
65 | /* b5 = reset b */\r |
66 | /* b4 = reset a */\r |
67 | /* b3 = timer enable b */\r |
68 | /* b2 = timer enable a */\r |
69 | /* b1 = load b */\r |
70 | /* b0 = load a */\r |
71 | ST_mode = v;\r |
72 | \r |
73 | /* reset Timer b flag */\r |
74 | if( v & 0x20 )\r |
75 | ST_status &= ~2;\r |
76 | \r |
77 | /* reset Timer a flag */\r |
78 | if( v & 0x10 )\r |
79 | ST_status &= ~1;\r |
80 | }\r |
81 | \r |
82 | /* YM2612 write */\r |
83 | /* a = address */\r |
84 | /* v = value */\r |
85 | /* returns 1 if sample affecting state changed */\r |
86 | int YM2612Write_940(unsigned int a, unsigned int v)\r |
87 | {\r |
88 | int addr; //, ret=1;\r |
89 | \r |
90 | v &= 0xff; /* adjust to 8 bit bus */\r |
91 | a &= 3;\r |
92 | \r |
93 | switch( a ) {\r |
94 | case 0: /* address port 0 */\r |
95 | ST_address = v;\r |
96 | addr_A1 = 0;\r |
97 | //ret=0;\r |
98 | break;\r |
99 | \r |
100 | case 1: /* data port 0 */\r |
101 | if (addr_A1 != 0) {\r |
102 | return 0; /* verified on real YM2608 */\r |
103 | }\r |
104 | \r |
105 | addr = ST_address;\r |
106 | REGS[addr] = v;\r |
107 | \r |
108 | switch( addr & 0xf0 )\r |
109 | {\r |
110 | case 0x20: /* 0x20-0x2f Mode */\r |
111 | switch( addr )\r |
112 | {\r |
113 | case 0x24: { // timer A High 8\r |
114 | int TAnew = (ST_TA & 0x03)|(((int)v)<<2);\r |
115 | if(ST_TA != TAnew) {\r |
116 | // we should reset ticker only if new value is written. Outrun requires this.\r |
117 | ST_TA = TAnew;\r |
118 | ST_TAC = (1024-TAnew)*18;\r |
119 | ST_TAT = 0;\r |
120 | }\r |
121 | return 0;\r |
122 | }\r |
123 | case 0x25: { // timer A Low 2\r |
124 | int TAnew = (ST_TA & 0x3fc)|(v&3);\r |
125 | if(ST_TA != TAnew) {\r |
126 | ST_TA = TAnew;\r |
127 | ST_TAC = (1024-TAnew)*18;\r |
128 | ST_TAT = 0;\r |
129 | }\r |
130 | return 0;\r |
131 | }\r |
132 | case 0x26: // timer B\r |
133 | if(ST_TB != v) {\r |
134 | ST_TB = v;\r |
135 | ST_TBC = (256-v)<<4;\r |
136 | ST_TBC *= 18;\r |
137 | ST_TBT = 0;\r |
138 | }\r |
139 | return 0;\r |
140 | case 0x27: /* mode, timer control */\r |
141 | set_timers( v );\r |
142 | break; // other side needs ST.mode for 3slot mode\r |
143 | case 0x2a: /* DAC data (YM2612) */\r |
144 | dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r |
145 | return 0;\r |
146 | case 0x2b: /* DAC Sel (YM2612) */\r |
147 | /* b7 = dac enable */\r |
148 | dacen = v & 0x80;\r |
149 | break; // other side has to know this\r |
150 | default:\r |
151 | break;\r |
152 | }\r |
153 | break;\r |
154 | }\r |
155 | break;\r |
156 | \r |
157 | case 2: /* address port 1 */\r |
158 | ST_address = v;\r |
159 | addr_A1 = 1;\r |
160 | //ret=0;\r |
161 | break;\r |
162 | \r |
163 | case 3: /* data port 1 */\r |
164 | if (addr_A1 != 1) {\r |
165 | return 0; /* verified on real YM2608 */\r |
166 | }\r |
167 | \r |
168 | addr = ST_address | 0x100;\r |
169 | REGS[addr] = v;\r |
170 | break;\r |
171 | }\r |
172 | \r |
173 | if(currentConfig.EmuOpt & 4) {\r |
174 | /* queue this write for 940 */\r |
175 | if (writebuff_ptr < 2047) {\r |
176 | if (shared_ctl->writebuffsel == 1) {\r |
177 | shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)|v;\r |
178 | } else {\r |
179 | shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)|v;\r |
180 | }\r |
181 | } else {\r |
182 | printf("warning: writebuff_ptr > 2047\n");\r |
183 | }\r |
184 | }\r |
185 | \r |
186 | return 0; // cause the engine to do updates once per frame only\r |
187 | }\r |
188 | \r |
189 | UINT8 YM2612Read_940(void)\r |
190 | {\r |
191 | return ST_status;\r |
192 | }\r |
193 | \r |
194 | \r |
195 | int YM2612PicoTick_940(int n)\r |
196 | {\r |
197 | //int ret = 0;\r |
198 | \r |
199 | // timer A\r |
200 | if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r |
201 | ST_TAT -= ST_TAC;\r |
202 | if(ST_mode & 0x04) ST_status |= 1;\r |
203 | // CSM mode total level latch and auto key on\r |
204 | /* FIXME\r |
205 | if(ST_mode & 0x80) {\r |
206 | CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r |
207 | ret = 1;\r |
208 | }\r |
209 | */\r |
210 | }\r |
211 | \r |
212 | // timer B\r |
213 | if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r |
214 | ST_TBT -= ST_TBC;\r |
215 | if(ST_mode & 0x08) ST_status |= 2;\r |
216 | }\r |
217 | \r |
218 | return 0;\r |
219 | }\r |
220 | \r |
221 | \r |
222 | static void wait_busy_940(void)\r |
223 | {\r |
224 | int i;\r |
225 | #if 0\r |
226 | printf("940 busy, entering wait loop.. (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r |
227 | for (i = 0; i < 8; i++)\r |
228 | printf("%i ", shared_ctl->vstarts[i]);\r |
229 | printf(")\n");\r |
230 | \r |
231 | for (i = 0; shared_ctl->busy; i++)\r |
232 | {\r |
233 | spend_cycles(1024); /* needs tuning */\r |
234 | }\r |
235 | printf("wait iterations: %i\n", i);\r |
236 | #else\r |
237 | for (i = 0; shared_ctl->busy && i < 0x10000; i++)\r |
238 | spend_cycles(4*1024);\r |
239 | if (i < 0x10000) return;\r |
240 | \r |
241 | /* 940 crashed */\r |
242 | printf("940 crashed (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r |
243 | for (i = 0; i < 8; i++)\r |
244 | printf("%i ", shared_ctl->vstarts[i]);\r |
245 | printf(")\n");\r |
246 | strcpy(menuErrorMsg, "940 crashed.");\r |
247 | engineState = PGS_Menu;\r |
248 | crashed_940 = 1;\r |
249 | #endif\r |
250 | }\r |
251 | \r |
252 | \r |
253 | static void add_job_940(int job)\r |
254 | {\r |
255 | shared_ctl->job = job;\r |
256 | shared_ctl->busy = 1;\r |
257 | gp2x_memregs[0x3B3E>>1] = 0xffff; // cause an IRQ for 940\r |
258 | }\r |
259 | \r |
260 | \r |
261 | void YM2612PicoStateLoad_940(void)\r |
262 | {\r |
263 | int i, old_A1 = addr_A1;\r |
264 | \r |
265 | if (shared_ctl->busy) wait_busy_940();\r |
266 | \r |
267 | // feed all the registers and update internal state\r |
268 | for(i = 0; i < 0x100; i++) {\r |
269 | YM2612Write_940(0, i);\r |
270 | YM2612Write_940(1, REGS[i]);\r |
271 | }\r |
272 | for(i = 0; i < 0x100; i++) {\r |
273 | YM2612Write_940(2, i);\r |
274 | YM2612Write_940(3, REGS[i|0x100]);\r |
275 | }\r |
276 | \r |
277 | addr_A1 = old_A1;\r |
278 | \r |
279 | add_job_940(JOB940_PICOSTATELOAD);\r |
280 | }\r |
281 | \r |
282 | \r |
283 | static void internal_reset(void)\r |
284 | {\r |
285 | writebuff_ptr = 0;\r |
286 | ST_mode = 0;\r |
287 | ST_status = 0; /* normal mode */\r |
288 | ST_TA = 0;\r |
289 | ST_TAC = 0;\r |
290 | ST_TB = 0;\r |
291 | ST_TBC = 0;\r |
292 | dacen = 0;\r |
293 | }\r |
294 | \r |
295 | \r |
296 | extern char **g_argv;\r |
297 | \r |
298 | /* none of the functions in this file should be called before this one */\r |
299 | void YM2612Init_940(int baseclock, int rate)\r |
300 | {\r |
301 | printf("YM2612Init_940()\n");\r |
302 | //printf("sizeof(*shared_data): %i (%x)\n", sizeof(*shared_data), sizeof(*shared_data));\r |
303 | //printf("sizeof(*shared_ctl): %i (%x)\n", sizeof(*shared_ctl), sizeof(*shared_ctl));\r |
304 | \r |
305 | Reset940(1);\r |
306 | Pause940(1);\r |
307 | \r |
308 | gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r |
309 | gp2x_memregs[0x3B42>>1] = 0xffff; // enable DUALCPU interrupts for 940\r |
310 | \r |
311 | gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r |
312 | \r |
313 | if (shared_mem == NULL)\r |
314 | {\r |
315 | shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);\r |
316 | if(shared_mem == MAP_FAILED)\r |
317 | {\r |
318 | printf("mmap(shared_data) failed with %i\n", errno);\r |
319 | exit(1);\r |
320 | }\r |
321 | shared_data = (_940_data_t *) (shared_mem+0x100000);\r |
322 | /* this area must not get buffered on either side */\r |
323 | shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r |
324 | crashed_940 = 1;\r |
325 | }\r |
326 | \r |
327 | if (crashed_940)\r |
328 | {\r |
329 | unsigned char ucData[1024];\r |
330 | int nRead, i, nLen = 0;\r |
331 | char binpath[1024];\r |
332 | FILE *fp;\r |
333 | \r |
334 | strncpy(binpath, g_argv[0], 1023);\r |
335 | binpath[1023] = 0;\r |
336 | for (i = strlen(binpath); i > 0; i--)\r |
337 | if (binpath[i] == '/') { binpath[i] = 0; break; }\r |
338 | strcat(binpath, "/code940.bin");\r |
339 | \r |
340 | fp = fopen(binpath, "rb");\r |
341 | if(!fp)\r |
342 | {\r |
343 | memset(gp2x_screen, 0, 320*240);\r |
344 | gp2x_text_out8(10, 100, "failed to open required file:");\r |
345 | gp2x_text_out8(10, 110, "code940.bin");\r |
346 | gp2x_video_flip();\r |
347 | printf("failed to open %s\n", binpath);\r |
348 | exit(1);\r |
349 | }\r |
350 | \r |
351 | while(1)\r |
352 | {\r |
353 | nRead = fread(ucData, 1, 1024, fp);\r |
354 | if(nRead <= 0)\r |
355 | break;\r |
356 | memcpy(shared_mem + nLen, ucData, nRead);\r |
357 | nLen += nRead;\r |
358 | }\r |
359 | fclose(fp);\r |
360 | crashed_940 = 0;\r |
361 | }\r |
362 | \r |
363 | memset(shared_data, 0, sizeof(*shared_data));\r |
364 | memset(shared_ctl, 0, sizeof(*shared_ctl));\r |
365 | \r |
366 | REGS = YM2612GetRegs();\r |
367 | \r |
368 | ym2612_dacen = &dacen;\r |
369 | ym2612_dacout = &dacout;\r |
370 | \r |
371 | internal_reset();\r |
372 | \r |
373 | /* now cause 940 to init it's ym2612 stuff */\r |
374 | shared_ctl->baseclock = baseclock;\r |
375 | shared_ctl->rate = rate;\r |
376 | shared_ctl->job = JOB940_YM2612INIT;\r |
377 | shared_ctl->busy = 1;\r |
378 | \r |
379 | /* start the 940 */\r |
380 | Reset940(0);\r |
381 | Pause940(0);\r |
382 | \r |
383 | // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r |
384 | }\r |
385 | \r |
386 | \r |
387 | void YM2612ResetChip_940(void)\r |
388 | {\r |
389 | printf("YM2612ResetChip_940()\n");\r |
390 | if (shared_data == NULL) {\r |
391 | printf("YM2612ResetChip_940: reset before init?\n");\r |
392 | return;\r |
393 | }\r |
394 | \r |
395 | if (shared_ctl->busy) wait_busy_940();\r |
396 | \r |
397 | internal_reset();\r |
398 | \r |
399 | add_job_940(JOB940_YM2612RESETCHIP);\r |
400 | }\r |
401 | \r |
402 | \r |
403 | void YM2612UpdateOne_940(short *buffer, int length, int stereo)\r |
404 | {\r |
405 | int i, *mix_buffer = shared_data->mix_buffer;\r |
406 | \r |
407 | //printf("YM2612UpdateOne_940()\n");\r |
408 | if (shared_ctl->busy) wait_busy_940();\r |
409 | \r |
410 | //printf("940 (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r |
411 | //for (i = 0; i < 8; i++)\r |
412 | // printf("%i ", shared_ctl->vstarts[i]);\r |
413 | //printf(")\n");\r |
414 | \r |
415 | /* mix data from previous go */\r |
416 | if (stereo) {\r |
417 | int *mb = mix_buffer;\r |
418 | for (i = length; i > 0; i--) {\r |
419 | int l, r;\r |
420 | l = r = *buffer;\r |
421 | l += *mb++, r += *mb++;\r |
422 | Limit( l, MAXOUT, MINOUT );\r |
423 | Limit( r, MAXOUT, MINOUT );\r |
424 | *buffer++ = l; *buffer++ = r;\r |
425 | }\r |
426 | } else {\r |
427 | for (i = 0; i < length; i++) {\r |
428 | int l = mix_buffer[i];\r |
429 | l += buffer[i];\r |
430 | Limit( l, MAXOUT, MINOUT );\r |
431 | buffer[i] = l;\r |
432 | }\r |
433 | }\r |
434 | \r |
435 | //printf("new writes: %i\n", writebuff_ptr);\r |
436 | if (shared_ctl->writebuffsel == 1) {\r |
437 | shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r |
438 | } else {\r |
439 | shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r |
440 | }\r |
441 | writebuff_ptr = 0;\r |
442 | \r |
443 | /* give 940 another job */\r |
444 | shared_ctl->writebuffsel ^= 1;\r |
445 | shared_ctl->length = length;\r |
446 | shared_ctl->stereo = stereo;\r |
447 | add_job_940(JOB940_YM2612UPDATEONE);\r |
448 | //spend_cycles(512);\r |
449 | //printf("SRCPND: %08lx, INTMODE: %08lx, INTMASK: %08lx, INTPEND: %08lx\n",\r |
450 | // gp2x_memregl[0x4500>>2], gp2x_memregl[0x4504>>2], gp2x_memregl[0x4508>>2], gp2x_memregl[0x4510>>2]);\r |
451 | }\r |