cff531af |
1 | /* |
2 | * PicoDrive |
ae214f1c |
3 | * (C) notaz, 2007,2013 |
cff531af |
4 | * |
5 | * This work is licensed under the terms of MAME license. |
6 | * See COPYING file in the top-level directory. |
7 | */ |
cc68a136 |
8 | |
efcba75f |
9 | #include "../pico_int.h" |
43e6eaad |
10 | #include "../sound/ym2612.h" |
cc68a136 |
11 | |
76276b0b |
12 | extern unsigned char formatted_bram[4*0x10]; |
ae214f1c |
13 | |
a6523294 |
14 | static unsigned int mcd_m68k_cycle_mult; |
15 | static unsigned int mcd_m68k_cycle_base; |
16 | static unsigned int mcd_s68k_cycle_base; |
89fa852d |
17 | |
721cd396 |
18 | void (*PicoMCDopenTray)(void) = NULL; |
d687ef50 |
19 | void (*PicoMCDcloseTray)(void) = NULL; |
89fa852d |
20 | |
cc68a136 |
21 | |
2aa27095 |
22 | PICO_INTERNAL void PicoInitMCD(void) |
cc68a136 |
23 | { |
24 | SekInitS68k(); |
cc68a136 |
25 | } |
26 | |
eff55556 |
27 | PICO_INTERNAL void PicoExitMCD(void) |
cc68a136 |
28 | { |
cc68a136 |
29 | } |
30 | |
1cb1584b |
31 | PICO_INTERNAL void PicoPowerMCD(void) |
32 | { |
24aab4da |
33 | int fmt_size; |
34 | |
8e4e84c2 |
35 | SekCycleCntS68k = SekCycleAimS68k = 0; |
36 | |
24aab4da |
37 | fmt_size = sizeof(formatted_bram); |
1cb1584b |
38 | memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram)); |
39 | memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); |
40 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
41 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
4fb43555 |
42 | memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, |
43 | formatted_bram, fmt_size); |
51a902ae |
44 | memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs)); |
4f265db7 |
45 | memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm)); |
5c69a605 |
46 | memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m)); |
51a902ae |
47 | |
3f23709e |
48 | cdc_init(); |
274fcc35 |
49 | gfx_init(); |
d0132772 |
50 | |
4fb43555 |
51 | // cold reset state (tested) |
52 | Pico_mcd->m.state_flags = PCD_ST_S68K_RST; |
53 | Pico_mcd->m.busreq = 2; // busreq on, s68k in reset |
54 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access |
4fb43555 |
55 | memset(Pico_mcd->bios + 0x70, 0xff, 4); |
56 | } |
cc68a136 |
57 | |
d0132772 |
58 | void pcd_soft_reset(void) |
4fb43555 |
59 | { |
7b3ddc11 |
60 | elprintf(EL_CD, "cd: soft reset"); |
d0132772 |
61 | |
3f23709e |
62 | Pico_mcd->m.s68k_pend_ints = 0; |
63 | cdc_reset(); |
274fcc35 |
64 | cdd_reset(); |
3aa1e148 |
65 | #ifdef _ASM_CD_MEMORY_C |
00bd648e |
66 | //PicoMemResetCDdecode(1); // don't have to call this in 2M mode |
4ff2d527 |
67 | #endif |
cc68a136 |
68 | |
7b3ddc11 |
69 | memset(&Pico_mcd->s68k_regs[0x38], 0, 9); |
70 | Pico_mcd->s68k_regs[0x38+9] = 0x0f; // default checksum |
71 | |
d0132772 |
72 | pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75); |
73 | |
74 | // TODO: test if register state/timers change |
75 | } |
76 | |
77 | PICO_INTERNAL int PicoResetMCD(void) |
78 | { |
79 | // reset button doesn't affect MCD hardware |
80 | |
88fd63ad |
81 | // use Pico.sv.data for RAM cart |
af37bca8 |
82 | if (PicoOpt & POPT_EN_MCD_RAMCART) { |
88fd63ad |
83 | if (Pico.sv.data == NULL) |
84 | Pico.sv.data = calloc(1, 0x12000); |
d6114368 |
85 | } |
88fd63ad |
86 | else if (Pico.sv.data != NULL) { |
87 | free(Pico.sv.data); |
88 | Pico.sv.data = NULL; |
d6114368 |
89 | } |
88fd63ad |
90 | Pico.sv.start = Pico.sv.end = 0; // unused |
6cadc2da |
91 | |
cc68a136 |
92 | return 0; |
93 | } |
94 | |
6901d0e4 |
95 | static void SekRunM68kOnce(void) |
96 | { |
97 | int cyc_do; |
98 | pevt_log_m68k_o(EVT_RUN_START); |
99 | |
88fd63ad |
100 | if ((cyc_do = Pico.t.m68c_aim - Pico.t.m68c_cnt) > 0) { |
101 | Pico.t.m68c_cnt += cyc_do; |
6901d0e4 |
102 | |
103 | #if defined(EMU_C68K) |
104 | PicoCpuCM68k.cycles = cyc_do; |
105 | CycloneRun(&PicoCpuCM68k); |
88fd63ad |
106 | Pico.t.m68c_cnt -= PicoCpuCM68k.cycles; |
6901d0e4 |
107 | #elif defined(EMU_M68K) |
88fd63ad |
108 | Pico.t.m68c_cnt += m68k_execute(cyc_do) - cyc_do; |
6901d0e4 |
109 | #elif defined(EMU_F68K) |
12f23dac |
110 | Pico.t.m68c_cnt += fm68k_emulate(&PicoCpuFM68k, cyc_do, 0) - cyc_do; |
6901d0e4 |
111 | #endif |
112 | } |
113 | |
114 | SekCyclesLeft = 0; |
115 | |
116 | SekTrace(0); |
117 | pevt_log_m68k_o(EVT_RUN_END); |
118 | } |
119 | |
120 | static void SekRunS68k(unsigned int to) |
cc68a136 |
121 | { |
122 | int cyc_do; |
ae214f1c |
123 | |
124 | SekCycleAimS68k = to; |
125 | if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0) |
126 | return; |
127 | |
30e8aac4 |
128 | if (SekShouldInterrupt()) |
129 | Pico_mcd->m.s68k_poll_a = 0; |
130 | |
ae214f1c |
131 | SekCycleCntS68k += cyc_do; |
132 | #if defined(EMU_C68K) |
133 | PicoCpuCS68k.cycles = cyc_do; |
3aa1e148 |
134 | CycloneRun(&PicoCpuCS68k); |
ae214f1c |
135 | SekCycleCntS68k -= PicoCpuCS68k.cycles; |
b837b69b |
136 | #elif defined(EMU_M68K) |
3aa1e148 |
137 | m68k_set_context(&PicoCpuMS68k); |
ae214f1c |
138 | SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do; |
ed4402a7 |
139 | m68k_set_context(&PicoCpuMM68k); |
3aa1e148 |
140 | #elif defined(EMU_F68K) |
12f23dac |
141 | SekCycleCntS68k += fm68k_emulate(&PicoCpuFS68k, cyc_do, 0) - cyc_do; |
ae214f1c |
142 | g_m68kcontext = &PicoCpuFM68k; |
cc68a136 |
143 | #endif |
144 | } |
145 | |
8e4e84c2 |
146 | static void pcd_set_cycle_mult(void) |
147 | { |
148 | // ~1.63 for NTSC, ~1.645 for PAL |
149 | if (Pico.m.pal) |
e42a47e2 |
150 | mcd_m68k_cycle_mult = ((12500000ull << 16) / (50*313*488)); |
8e4e84c2 |
151 | else |
a6523294 |
152 | mcd_m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1; |
8e4e84c2 |
153 | } |
68cba51e |
154 | |
ae214f1c |
155 | unsigned int pcd_cycles_m68k_to_s68k(unsigned int c) |
8022f53d |
156 | { |
a6523294 |
157 | return (long long)c * mcd_m68k_cycle_mult >> 16; |
8022f53d |
158 | } |
ae214f1c |
159 | |
160 | /* events */ |
161 | static void pcd_cdc_event(unsigned int now) |
68cba51e |
162 | { |
ae214f1c |
163 | // 75Hz CDC update |
274fcc35 |
164 | cdd_update(); |
165 | |
166 | /* check if a new CDD command has been processed */ |
167 | if (!(Pico_mcd->s68k_regs[0x4b] & 0xf0)) |
168 | { |
169 | /* reset CDD command wait flag */ |
170 | Pico_mcd->s68k_regs[0x4b] = 0xf0; |
171 | |
172 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) { |
173 | elprintf(EL_INTS|EL_CD, "s68k: cdd irq 4"); |
174 | SekInterruptS68k(4); |
175 | } |
176 | } |
177 | |
ae214f1c |
178 | pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75); |
179 | } |
7336a99a |
180 | |
ae214f1c |
181 | static void pcd_int3_timer_event(unsigned int now) |
182 | { |
183 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) { |
184 | elprintf(EL_INTS|EL_CD, "s68k: timer irq 3"); |
185 | SekInterruptS68k(3); |
186 | } |
7336a99a |
187 | |
ae214f1c |
188 | if (Pico_mcd->s68k_regs[0x31] != 0) |
189 | pcd_event_schedule(now, PCD_EVENT_TIMER3, |
190 | Pico_mcd->s68k_regs[0x31] * 384); |
191 | } |
192 | |
ae214f1c |
193 | static void pcd_dma_event(unsigned int now) |
194 | { |
3f23709e |
195 | cdc_dma_update(); |
ae214f1c |
196 | } |
68cba51e |
197 | |
ae214f1c |
198 | typedef void (event_cb)(unsigned int now); |
199 | |
200 | /* times are in s68k (12.5MHz) cycles */ |
201 | unsigned int pcd_event_times[PCD_EVENT_COUNT]; |
202 | static unsigned int event_time_next; |
203 | static event_cb *pcd_event_cbs[PCD_EVENT_COUNT] = { |
24aab4da |
204 | pcd_cdc_event, // PCD_EVENT_CDC |
205 | pcd_int3_timer_event, // PCD_EVENT_TIMER3 |
206 | gfx_update, // PCD_EVENT_GFX |
207 | pcd_dma_event, // PCD_EVENT_DMA |
ae214f1c |
208 | }; |
209 | |
210 | void pcd_event_schedule(unsigned int now, enum pcd_event event, int after) |
bf098bc5 |
211 | { |
ae214f1c |
212 | unsigned int when; |
213 | |
214 | when = now + after; |
215 | if (when == 0) { |
216 | // event cancelled |
217 | pcd_event_times[event] = 0; |
218 | return; |
219 | } |
bf098bc5 |
220 | |
ae214f1c |
221 | when |= 1; |
bf098bc5 |
222 | |
ae214f1c |
223 | elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when); |
224 | pcd_event_times[event] = when; |
bf098bc5 |
225 | |
ae214f1c |
226 | if (event_time_next == 0 || CYCLES_GT(event_time_next, when)) |
227 | event_time_next = when; |
bf098bc5 |
228 | } |
229 | |
ae214f1c |
230 | void pcd_event_schedule_s68k(enum pcd_event event, int after) |
4f265db7 |
231 | { |
ae214f1c |
232 | if (SekCyclesLeftS68k > after) |
233 | SekEndRunS68k(after); |
4f265db7 |
234 | |
ae214f1c |
235 | pcd_event_schedule(SekCyclesDoneS68k(), event, after); |
236 | } |
4f265db7 |
237 | |
ae214f1c |
238 | static void pcd_run_events(unsigned int until) |
239 | { |
240 | int oldest, oldest_diff, time; |
241 | int i, diff; |
242 | |
243 | while (1) { |
244 | oldest = -1, oldest_diff = 0x7fffffff; |
245 | |
246 | for (i = 0; i < PCD_EVENT_COUNT; i++) { |
247 | if (pcd_event_times[i]) { |
248 | diff = pcd_event_times[i] - until; |
249 | if (diff < oldest_diff) { |
250 | oldest_diff = diff; |
251 | oldest = i; |
252 | } |
253 | } |
254 | } |
255 | |
256 | if (oldest_diff <= 0) { |
257 | time = pcd_event_times[oldest]; |
258 | pcd_event_times[oldest] = 0; |
259 | elprintf(EL_CD, "cd: run event #%d %u", oldest, time); |
260 | pcd_event_cbs[oldest](time); |
261 | } |
262 | else if (oldest_diff < 0x7fffffff) { |
263 | event_time_next = pcd_event_times[oldest]; |
264 | break; |
265 | } |
266 | else { |
267 | event_time_next = 0; |
268 | break; |
269 | } |
270 | } |
4f265db7 |
271 | |
ae214f1c |
272 | if (oldest != -1) |
273 | elprintf(EL_CD, "cd: next event #%d at %u", |
274 | oldest, event_time_next); |
4f265db7 |
275 | } |
276 | |
08769494 |
277 | int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync) |
ae214f1c |
278 | { |
279 | #define now SekCycleCntS68k |
a6523294 |
280 | unsigned int s68k_target; |
ae214f1c |
281 | unsigned int target; |
b837b69b |
282 | |
a6523294 |
283 | target = m68k_target - mcd_m68k_cycle_base; |
284 | s68k_target = mcd_s68k_cycle_base + |
285 | ((unsigned long long)target * mcd_m68k_cycle_mult >> 16); |
286 | |
08769494 |
287 | elprintf(EL_CD, "s68k sync to %u, %u->%u", |
288 | m68k_target, now, s68k_target); |
ae214f1c |
289 | |
4fb43555 |
290 | if (Pico_mcd->m.busreq != 1) { /* busreq/reset */ |
ae214f1c |
291 | SekCycleCntS68k = SekCycleAimS68k = s68k_target; |
292 | pcd_run_events(m68k_target); |
08769494 |
293 | return 0; |
ae214f1c |
294 | } |
295 | |
296 | while (CYCLES_GT(s68k_target, now)) { |
297 | if (event_time_next && CYCLES_GE(now, event_time_next)) |
298 | pcd_run_events(now); |
299 | |
300 | target = s68k_target; |
301 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
302 | target = event_time_next; |
303 | |
304 | SekRunS68k(target); |
08769494 |
305 | if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0) |
306 | break; |
ae214f1c |
307 | } |
08769494 |
308 | |
309 | return s68k_target - now; |
ae214f1c |
310 | #undef now |
c987bb5c |
311 | } |
ae214f1c |
312 | |
ba6e8bfd |
313 | #define pcd_run_cpus_normal pcd_run_cpus |
314 | //#define pcd_run_cpus_lockstep pcd_run_cpus |
315 | |
08769494 |
316 | static void SekSyncM68k(void); |
317 | |
fa8fb754 |
318 | void pcd_run_cpus_normal(int m68k_cycles) |
08769494 |
319 | { |
88fd63ad |
320 | Pico.t.m68c_aim += m68k_cycles; |
30e8aac4 |
321 | if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12) |
cc5ffc3c |
322 | Pico_mcd->m.m68k_poll_cnt = 0; |
323 | else if (Pico_mcd->m.m68k_poll_cnt >= 16) { |
88fd63ad |
324 | int s68k_left = pcd_sync_s68k(Pico.t.m68c_aim, 1); |
08769494 |
325 | if (s68k_left <= 0) { |
ba6e8bfd |
326 | elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x", |
08769494 |
327 | Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc); |
88fd63ad |
328 | Pico.t.m68c_cnt = Pico.t.m68c_aim; |
08769494 |
329 | return; |
330 | } |
88fd63ad |
331 | Pico.t.m68c_cnt = Pico.t.m68c_aim - (s68k_left * 40220 >> 16); |
08769494 |
332 | } |
333 | |
88fd63ad |
334 | while (CYCLES_GT(Pico.t.m68c_aim, Pico.t.m68c_cnt)) { |
6901d0e4 |
335 | SekRunM68kOnce(); |
336 | if (Pico_mcd->m.need_sync) { |
337 | Pico_mcd->m.need_sync = 0; |
88fd63ad |
338 | pcd_sync_s68k(Pico.t.m68c_cnt, 0); |
6901d0e4 |
339 | } |
340 | } |
08769494 |
341 | } |
342 | |
fa8fb754 |
343 | void pcd_run_cpus_lockstep(int m68k_cycles) |
ba6e8bfd |
344 | { |
88fd63ad |
345 | unsigned int target = Pico.t.m68c_aim + m68k_cycles; |
ba6e8bfd |
346 | do { |
88fd63ad |
347 | Pico.t.m68c_aim += 8; |
ba6e8bfd |
348 | SekSyncM68k(); |
88fd63ad |
349 | pcd_sync_s68k(Pico.t.m68c_aim, 0); |
350 | } while (CYCLES_GT(target, Pico.t.m68c_aim)); |
cc5ffc3c |
351 | |
88fd63ad |
352 | Pico.t.m68c_aim = target; |
ba6e8bfd |
353 | } |
354 | |
ae214f1c |
355 | #define PICO_CD |
356 | #define CPUS_RUN(m68k_cycles) \ |
08769494 |
357 | pcd_run_cpus(m68k_cycles) |
ae214f1c |
358 | |
efcba75f |
359 | #include "../pico_cmn.c" |
cc68a136 |
360 | |
361 | |
a6523294 |
362 | void pcd_prepare_frame(void) |
363 | { |
364 | pcd_set_cycle_mult(); |
365 | |
366 | // need this because we can't have direct mapping between |
367 | // master<->slave cycle counters because of overflows |
88fd63ad |
368 | mcd_m68k_cycle_base = Pico.t.m68c_aim; |
a6523294 |
369 | mcd_s68k_cycle_base = SekCycleAimS68k; |
370 | } |
371 | |
2aa27095 |
372 | PICO_INTERNAL void PicoFrameMCD(void) |
cc68a136 |
373 | { |
a6523294 |
374 | PicoFrameStart(); |
cc68a136 |
375 | |
a6523294 |
376 | pcd_prepare_frame(); |
bf5fbbb4 |
377 | PicoFrameHints(); |
cc68a136 |
378 | } |
379 | |
ae214f1c |
380 | void pcd_state_loaded(void) |
381 | { |
382 | unsigned int cycles; |
383 | int diff; |
384 | |
8e4e84c2 |
385 | pcd_set_cycle_mult(); |
ae214f1c |
386 | pcd_state_loaded_mem(); |
387 | |
33be04ca |
388 | memset(Pico_mcd->pcm_mixbuf, 0, sizeof(Pico_mcd->pcm_mixbuf)); |
389 | Pico_mcd->pcm_mixbuf_dirty = 0; |
390 | Pico_mcd->pcm_mixpos = 0; |
021e47b3 |
391 | Pico_mcd->pcm_regs_dirty = 1; |
33be04ca |
392 | |
ae214f1c |
393 | // old savestates.. |
88fd63ad |
394 | cycles = pcd_cycles_m68k_to_s68k(Pico.t.m68c_aim); |
ae214f1c |
395 | diff = cycles - SekCycleAimS68k; |
396 | if (diff < -1000 || diff > 1000) { |
397 | SekCycleCntS68k = SekCycleAimS68k = cycles; |
398 | } |
399 | if (pcd_event_times[PCD_EVENT_CDC] == 0) { |
400 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75); |
401 | |
402 | if (Pico_mcd->s68k_regs[0x31]) |
403 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3, |
404 | Pico_mcd->s68k_regs[0x31] * 384); |
ae214f1c |
405 | } |
334d9fb6 |
406 | |
407 | diff = cycles - Pico_mcd->pcm.update_cycles; |
408 | if ((unsigned int)diff > 12500000/50) |
33be04ca |
409 | Pico_mcd->pcm.update_cycles = cycles; |
8e4e84c2 |
410 | |
411 | // reschedule |
412 | event_time_next = 0; |
413 | pcd_run_events(SekCycleCntS68k); |
ae214f1c |
414 | } |
cc68a136 |
415 | |
ae214f1c |
416 | // vim:shiftwidth=2:ts=2:expandtab |