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" |
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11 | |
76276b0b |
12 | extern unsigned char formatted_bram[4*0x10]; |
ae214f1c |
13 | |
14 | static unsigned int m68k_cycle_mult; |
89fa852d |
15 | |
721cd396 |
16 | void (*PicoMCDopenTray)(void) = NULL; |
d687ef50 |
17 | void (*PicoMCDcloseTray)(void) = NULL; |
89fa852d |
18 | |
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19 | |
2aa27095 |
20 | PICO_INTERNAL void PicoInitMCD(void) |
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21 | { |
22 | SekInitS68k(); |
23 | Init_CD_Driver(); |
a93a80de |
24 | gfx_init(); |
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25 | } |
26 | |
eff55556 |
27 | PICO_INTERNAL void PicoExitMCD(void) |
cc68a136 |
28 | { |
29 | End_CD_Driver(); |
30 | } |
31 | |
1cb1584b |
32 | PICO_INTERNAL void PicoPowerMCD(void) |
33 | { |
8e4e84c2 |
34 | SekCycleCntS68k = SekCycleAimS68k = 0; |
35 | |
1cb1584b |
36 | int fmt_size = sizeof(formatted_bram); |
37 | memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram)); |
38 | memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); |
39 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
40 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
4fb43555 |
41 | memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, |
42 | formatted_bram, fmt_size); |
51a902ae |
43 | memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs)); |
4f265db7 |
44 | memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm)); |
5c69a605 |
45 | memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m)); |
51a902ae |
46 | |
d0132772 |
47 | Reset_CD(); |
48 | |
4fb43555 |
49 | // cold reset state (tested) |
50 | Pico_mcd->m.state_flags = PCD_ST_S68K_RST; |
51 | Pico_mcd->m.busreq = 2; // busreq on, s68k in reset |
52 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access |
4fb43555 |
53 | memset(Pico_mcd->bios + 0x70, 0xff, 4); |
54 | } |
cc68a136 |
55 | |
d0132772 |
56 | void pcd_soft_reset(void) |
4fb43555 |
57 | { |
d0132772 |
58 | // Reset_CD(); // breaks Fahrenheit CD swap |
59 | |
5c69a605 |
60 | LC89510_Reset(); |
3aa1e148 |
61 | #ifdef _ASM_CD_MEMORY_C |
00bd648e |
62 | //PicoMemResetCDdecode(1); // don't have to call this in 2M mode |
4ff2d527 |
63 | #endif |
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64 | |
d0132772 |
65 | pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75); |
66 | |
67 | // TODO: test if register state/timers change |
68 | } |
69 | |
70 | PICO_INTERNAL int PicoResetMCD(void) |
71 | { |
72 | // reset button doesn't affect MCD hardware |
73 | |
6cadc2da |
74 | // use SRam.data for RAM cart |
af37bca8 |
75 | if (PicoOpt & POPT_EN_MCD_RAMCART) { |
d6114368 |
76 | if (SRam.data == NULL) |
77 | SRam.data = calloc(1, 0x12000); |
78 | } |
79 | else if (SRam.data != NULL) { |
80 | free(SRam.data); |
81 | SRam.data = NULL; |
82 | } |
b542be46 |
83 | SRam.start = SRam.end = 0; // unused |
6cadc2da |
84 | |
cc68a136 |
85 | return 0; |
86 | } |
87 | |
ae214f1c |
88 | static __inline void SekRunS68k(unsigned int to) |
cc68a136 |
89 | { |
90 | int cyc_do; |
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91 | |
92 | SekCycleAimS68k = to; |
93 | if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0) |
94 | return; |
95 | |
30e8aac4 |
96 | if (SekShouldInterrupt()) |
97 | Pico_mcd->m.s68k_poll_a = 0; |
98 | |
ae214f1c |
99 | SekCycleCntS68k += cyc_do; |
100 | #if defined(EMU_C68K) |
101 | PicoCpuCS68k.cycles = cyc_do; |
3aa1e148 |
102 | CycloneRun(&PicoCpuCS68k); |
ae214f1c |
103 | SekCycleCntS68k -= PicoCpuCS68k.cycles; |
b837b69b |
104 | #elif defined(EMU_M68K) |
3aa1e148 |
105 | m68k_set_context(&PicoCpuMS68k); |
ae214f1c |
106 | SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do; |
ed4402a7 |
107 | m68k_set_context(&PicoCpuMM68k); |
3aa1e148 |
108 | #elif defined(EMU_F68K) |
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109 | g_m68kcontext = &PicoCpuFS68k; |
99ade2ee |
110 | SekCycleCntS68k += fm68k_emulate(cyc_do, 0) - cyc_do; |
ae214f1c |
111 | g_m68kcontext = &PicoCpuFM68k; |
cc68a136 |
112 | #endif |
113 | } |
114 | |
8e4e84c2 |
115 | static void pcd_set_cycle_mult(void) |
116 | { |
117 | // ~1.63 for NTSC, ~1.645 for PAL |
118 | if (Pico.m.pal) |
119 | m68k_cycle_mult = ((12500000ull << 16) / (50*312*488)); |
120 | else |
121 | m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1; |
122 | } |
68cba51e |
123 | |
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124 | unsigned int pcd_cycles_m68k_to_s68k(unsigned int c) |
8022f53d |
125 | { |
ae214f1c |
126 | return (long long)c * m68k_cycle_mult >> 16; |
8022f53d |
127 | } |
ae214f1c |
128 | |
129 | /* events */ |
130 | static void pcd_cdc_event(unsigned int now) |
68cba51e |
131 | { |
ae214f1c |
132 | // 75Hz CDC update |
133 | Check_CD_Command(); |
134 | pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75); |
135 | } |
7336a99a |
136 | |
ae214f1c |
137 | static void pcd_int3_timer_event(unsigned int now) |
138 | { |
139 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) { |
140 | elprintf(EL_INTS|EL_CD, "s68k: timer irq 3"); |
141 | SekInterruptS68k(3); |
142 | } |
7336a99a |
143 | |
ae214f1c |
144 | if (Pico_mcd->s68k_regs[0x31] != 0) |
145 | pcd_event_schedule(now, PCD_EVENT_TIMER3, |
146 | Pico_mcd->s68k_regs[0x31] * 384); |
147 | } |
148 | |
ae214f1c |
149 | static void pcd_dma_event(unsigned int now) |
150 | { |
151 | int ddx = Pico_mcd->s68k_regs[4] & 7; |
152 | Update_CDC_TRansfer(ddx); |
153 | } |
68cba51e |
154 | |
ae214f1c |
155 | typedef void (event_cb)(unsigned int now); |
156 | |
157 | /* times are in s68k (12.5MHz) cycles */ |
158 | unsigned int pcd_event_times[PCD_EVENT_COUNT]; |
159 | static unsigned int event_time_next; |
160 | static event_cb *pcd_event_cbs[PCD_EVENT_COUNT] = { |
161 | [PCD_EVENT_CDC] = pcd_cdc_event, |
162 | [PCD_EVENT_TIMER3] = pcd_int3_timer_event, |
a93a80de |
163 | [PCD_EVENT_GFX] = gfx_update, |
ae214f1c |
164 | [PCD_EVENT_DMA] = pcd_dma_event, |
165 | }; |
166 | |
167 | void pcd_event_schedule(unsigned int now, enum pcd_event event, int after) |
bf098bc5 |
168 | { |
ae214f1c |
169 | unsigned int when; |
170 | |
171 | when = now + after; |
172 | if (when == 0) { |
173 | // event cancelled |
174 | pcd_event_times[event] = 0; |
175 | return; |
176 | } |
bf098bc5 |
177 | |
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178 | when |= 1; |
bf098bc5 |
179 | |
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180 | elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when); |
181 | pcd_event_times[event] = when; |
bf098bc5 |
182 | |
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183 | if (event_time_next == 0 || CYCLES_GT(event_time_next, when)) |
184 | event_time_next = when; |
bf098bc5 |
185 | } |
186 | |
ae214f1c |
187 | void pcd_event_schedule_s68k(enum pcd_event event, int after) |
4f265db7 |
188 | { |
ae214f1c |
189 | if (SekCyclesLeftS68k > after) |
190 | SekEndRunS68k(after); |
4f265db7 |
191 | |
ae214f1c |
192 | pcd_event_schedule(SekCyclesDoneS68k(), event, after); |
193 | } |
4f265db7 |
194 | |
ae214f1c |
195 | static void pcd_run_events(unsigned int until) |
196 | { |
197 | int oldest, oldest_diff, time; |
198 | int i, diff; |
199 | |
200 | while (1) { |
201 | oldest = -1, oldest_diff = 0x7fffffff; |
202 | |
203 | for (i = 0; i < PCD_EVENT_COUNT; i++) { |
204 | if (pcd_event_times[i]) { |
205 | diff = pcd_event_times[i] - until; |
206 | if (diff < oldest_diff) { |
207 | oldest_diff = diff; |
208 | oldest = i; |
209 | } |
210 | } |
211 | } |
212 | |
213 | if (oldest_diff <= 0) { |
214 | time = pcd_event_times[oldest]; |
215 | pcd_event_times[oldest] = 0; |
216 | elprintf(EL_CD, "cd: run event #%d %u", oldest, time); |
217 | pcd_event_cbs[oldest](time); |
218 | } |
219 | else if (oldest_diff < 0x7fffffff) { |
220 | event_time_next = pcd_event_times[oldest]; |
221 | break; |
222 | } |
223 | else { |
224 | event_time_next = 0; |
225 | break; |
226 | } |
227 | } |
4f265db7 |
228 | |
ae214f1c |
229 | if (oldest != -1) |
230 | elprintf(EL_CD, "cd: next event #%d at %u", |
231 | oldest, event_time_next); |
4f265db7 |
232 | } |
233 | |
08769494 |
234 | int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync) |
ae214f1c |
235 | { |
236 | #define now SekCycleCntS68k |
237 | unsigned int s68k_target = |
238 | (unsigned long long)m68k_target * m68k_cycle_mult >> 16; |
239 | unsigned int target; |
b837b69b |
240 | |
08769494 |
241 | elprintf(EL_CD, "s68k sync to %u, %u->%u", |
242 | m68k_target, now, s68k_target); |
ae214f1c |
243 | |
4fb43555 |
244 | if (Pico_mcd->m.busreq != 1) { /* busreq/reset */ |
ae214f1c |
245 | SekCycleCntS68k = SekCycleAimS68k = s68k_target; |
246 | pcd_run_events(m68k_target); |
08769494 |
247 | return 0; |
ae214f1c |
248 | } |
249 | |
250 | while (CYCLES_GT(s68k_target, now)) { |
251 | if (event_time_next && CYCLES_GE(now, event_time_next)) |
252 | pcd_run_events(now); |
253 | |
254 | target = s68k_target; |
255 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
256 | target = event_time_next; |
257 | |
258 | SekRunS68k(target); |
08769494 |
259 | if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0) |
260 | break; |
ae214f1c |
261 | } |
08769494 |
262 | |
263 | return s68k_target - now; |
ae214f1c |
264 | #undef now |
c987bb5c |
265 | } |
ae214f1c |
266 | |
ba6e8bfd |
267 | #define pcd_run_cpus_normal pcd_run_cpus |
268 | //#define pcd_run_cpus_lockstep pcd_run_cpus |
269 | |
08769494 |
270 | static void SekSyncM68k(void); |
271 | |
fa8fb754 |
272 | void pcd_run_cpus_normal(int m68k_cycles) |
08769494 |
273 | { |
274 | SekCycleAim += m68k_cycles; |
30e8aac4 |
275 | if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12) |
cc5ffc3c |
276 | Pico_mcd->m.m68k_poll_cnt = 0; |
277 | else if (Pico_mcd->m.m68k_poll_cnt >= 16) { |
08769494 |
278 | int s68k_left = pcd_sync_s68k(SekCycleAim, 1); |
279 | if (s68k_left <= 0) { |
ba6e8bfd |
280 | elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x", |
08769494 |
281 | Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc); |
282 | SekCycleCnt = SekCycleAim; |
283 | return; |
284 | } |
285 | SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16); |
286 | } |
287 | |
288 | SekSyncM68k(); |
289 | } |
290 | |
fa8fb754 |
291 | void pcd_run_cpus_lockstep(int m68k_cycles) |
ba6e8bfd |
292 | { |
293 | unsigned int target = SekCycleAim + m68k_cycles; |
294 | do { |
295 | SekCycleAim += 8; |
296 | SekSyncM68k(); |
297 | pcd_sync_s68k(SekCycleAim, 0); |
298 | } while (CYCLES_GT(target, SekCycleAim)); |
cc5ffc3c |
299 | |
300 | SekCycleAim = target; |
ba6e8bfd |
301 | } |
302 | |
ae214f1c |
303 | #define PICO_CD |
304 | #define CPUS_RUN(m68k_cycles) \ |
08769494 |
305 | pcd_run_cpus(m68k_cycles) |
ae214f1c |
306 | |
efcba75f |
307 | #include "../pico_cmn.c" |
cc68a136 |
308 | |
309 | |
2aa27095 |
310 | PICO_INTERNAL void PicoFrameMCD(void) |
cc68a136 |
311 | { |
602133e1 |
312 | if (!(PicoOpt&POPT_ALT_RENDERER)) |
cc68a136 |
313 | PicoFrameStart(); |
314 | |
8e4e84c2 |
315 | pcd_set_cycle_mult(); |
bf5fbbb4 |
316 | PicoFrameHints(); |
cc68a136 |
317 | } |
318 | |
ae214f1c |
319 | void pcd_state_loaded(void) |
320 | { |
321 | unsigned int cycles; |
322 | int diff; |
323 | |
8e4e84c2 |
324 | pcd_set_cycle_mult(); |
ae214f1c |
325 | pcd_state_loaded_mem(); |
326 | |
33be04ca |
327 | memset(Pico_mcd->pcm_mixbuf, 0, sizeof(Pico_mcd->pcm_mixbuf)); |
328 | Pico_mcd->pcm_mixbuf_dirty = 0; |
329 | Pico_mcd->pcm_mixpos = 0; |
021e47b3 |
330 | Pico_mcd->pcm_regs_dirty = 1; |
33be04ca |
331 | |
ae214f1c |
332 | // old savestates.. |
333 | cycles = pcd_cycles_m68k_to_s68k(SekCycleAim); |
334 | diff = cycles - SekCycleAimS68k; |
335 | if (diff < -1000 || diff > 1000) { |
336 | SekCycleCntS68k = SekCycleAimS68k = cycles; |
337 | } |
338 | if (pcd_event_times[PCD_EVENT_CDC] == 0) { |
339 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75); |
340 | |
341 | if (Pico_mcd->s68k_regs[0x31]) |
342 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3, |
343 | Pico_mcd->s68k_regs[0x31] * 384); |
344 | |
ae214f1c |
345 | if (Pico_mcd->scd.Status_CDC & 0x08) |
346 | Update_CDC_TRansfer(Pico_mcd->s68k_regs[4] & 7); |
347 | } |
334d9fb6 |
348 | |
349 | diff = cycles - Pico_mcd->pcm.update_cycles; |
350 | if ((unsigned int)diff > 12500000/50) |
33be04ca |
351 | Pico_mcd->pcm.update_cycles = cycles; |
8e4e84c2 |
352 | |
353 | // reschedule |
354 | event_time_next = 0; |
355 | pcd_run_events(SekCycleCntS68k); |
ae214f1c |
356 | } |
cc68a136 |
357 | |
ae214f1c |
358 | // vim:shiftwidth=2:ts=2:expandtab |