5 * This work is licensed under the terms of MAME license.
6 * See COPYING file in the top-level directory.
9 #include "../pico_int.h"
10 #include "../sound/ym2612.h"
12 extern unsigned char formatted_bram[4*0x10];
14 static unsigned int mcd_m68k_cycle_mult;
15 static unsigned int mcd_m68k_cycle_base;
16 static unsigned int mcd_s68k_cycle_base;
18 void (*PicoMCDopenTray)(void) = NULL;
19 void (*PicoMCDcloseTray)(void) = NULL;
22 PICO_INTERNAL void PicoInitMCD(void)
27 PICO_INTERNAL void PicoExitMCD(void)
31 PICO_INTERNAL void PicoPowerMCD(void)
34 SekCycleCntS68k = SekCycleAimS68k = 0;
36 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));
41 memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size,
42 formatted_bram, fmt_size);
43 memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
44 memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
45 memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
50 // cold reset state (tested)
51 Pico_mcd->m.state_flags = PCD_ST_S68K_RST;
52 Pico_mcd->m.busreq = 2; // busreq on, s68k in reset
53 Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access
54 memset(Pico_mcd->bios + 0x70, 0xff, 4);
57 void pcd_soft_reset(void)
59 elprintf(EL_CD, "cd: soft reset");
61 Pico_mcd->m.s68k_pend_ints = 0;
64 #ifdef _ASM_CD_MEMORY_C
65 //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
68 memset(&Pico_mcd->s68k_regs[0x38], 0, 9);
69 Pico_mcd->s68k_regs[0x38+9] = 0x0f; // default checksum
71 pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75);
73 // TODO: test if register state/timers change
76 PICO_INTERNAL int PicoResetMCD(void)
78 // reset button doesn't affect MCD hardware
80 // use SRam.data for RAM cart
81 if (PicoOpt & POPT_EN_MCD_RAMCART) {
82 if (SRam.data == NULL)
83 SRam.data = calloc(1, 0x12000);
85 else if (SRam.data != NULL) {
89 SRam.start = SRam.end = 0; // unused
94 static void SekRunM68kOnce(void)
97 pevt_log_m68k_o(EVT_RUN_START);
99 if ((cyc_do = SekCycleAim - SekCycleCnt) > 0) {
100 SekCycleCnt += cyc_do;
102 #if defined(EMU_C68K)
103 PicoCpuCM68k.cycles = cyc_do;
104 CycloneRun(&PicoCpuCM68k);
105 SekCycleCnt -= PicoCpuCM68k.cycles;
106 #elif defined(EMU_M68K)
107 SekCycleCnt += m68k_execute(cyc_do) - cyc_do;
108 #elif defined(EMU_F68K)
109 SekCycleCnt += fm68k_emulate(cyc_do, 0) - cyc_do;
116 pevt_log_m68k_o(EVT_RUN_END);
119 static void SekRunS68k(unsigned int to)
123 SekCycleAimS68k = to;
124 if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0)
127 if (SekShouldInterrupt())
128 Pico_mcd->m.s68k_poll_a = 0;
130 SekCycleCntS68k += cyc_do;
131 #if defined(EMU_C68K)
132 PicoCpuCS68k.cycles = cyc_do;
133 CycloneRun(&PicoCpuCS68k);
134 SekCycleCntS68k -= PicoCpuCS68k.cycles;
135 #elif defined(EMU_M68K)
136 m68k_set_context(&PicoCpuMS68k);
137 SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do;
138 m68k_set_context(&PicoCpuMM68k);
139 #elif defined(EMU_F68K)
140 g_m68kcontext = &PicoCpuFS68k;
141 SekCycleCntS68k += fm68k_emulate(cyc_do, 0) - cyc_do;
142 g_m68kcontext = &PicoCpuFM68k;
146 static void pcd_set_cycle_mult(void)
148 // ~1.63 for NTSC, ~1.645 for PAL
150 mcd_m68k_cycle_mult = ((12500000ull << 16) / (50*312*488));
152 mcd_m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1;
155 unsigned int pcd_cycles_m68k_to_s68k(unsigned int c)
157 return (long long)c * mcd_m68k_cycle_mult >> 16;
161 static void pcd_cdc_event(unsigned int now)
166 /* check if a new CDD command has been processed */
167 if (!(Pico_mcd->s68k_regs[0x4b] & 0xf0))
169 /* reset CDD command wait flag */
170 Pico_mcd->s68k_regs[0x4b] = 0xf0;
172 if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) {
173 elprintf(EL_INTS|EL_CD, "s68k: cdd irq 4");
178 pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75);
181 static void pcd_int3_timer_event(unsigned int now)
183 if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) {
184 elprintf(EL_INTS|EL_CD, "s68k: timer irq 3");
188 if (Pico_mcd->s68k_regs[0x31] != 0)
189 pcd_event_schedule(now, PCD_EVENT_TIMER3,
190 Pico_mcd->s68k_regs[0x31] * 384);
193 static void pcd_dma_event(unsigned int now)
198 typedef void (event_cb)(unsigned int now);
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] = {
205 pcd_int3_timer_event,
210 void pcd_event_schedule(unsigned int now, enum pcd_event event, int after)
217 pcd_event_times[event] = 0;
223 elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when);
224 pcd_event_times[event] = when;
226 if (event_time_next == 0 || CYCLES_GT(event_time_next, when))
227 event_time_next = when;
230 void pcd_event_schedule_s68k(enum pcd_event event, int after)
232 if (SekCyclesLeftS68k > after)
233 SekEndRunS68k(after);
235 pcd_event_schedule(SekCyclesDoneS68k(), event, after);
238 static void pcd_run_events(unsigned int until)
240 int oldest, oldest_diff, time;
244 oldest = -1, oldest_diff = 0x7fffffff;
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) {
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);
262 else if (oldest_diff < 0x7fffffff) {
263 event_time_next = pcd_event_times[oldest];
273 elprintf(EL_CD, "cd: next event #%d at %u",
274 oldest, event_time_next);
277 int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync)
279 #define now SekCycleCntS68k
280 unsigned int s68k_target;
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);
287 elprintf(EL_CD, "s68k sync to %u, %u->%u",
288 m68k_target, now, s68k_target);
290 if (Pico_mcd->m.busreq != 1) { /* busreq/reset */
291 SekCycleCntS68k = SekCycleAimS68k = s68k_target;
292 pcd_run_events(m68k_target);
296 while (CYCLES_GT(s68k_target, now)) {
297 if (event_time_next && CYCLES_GE(now, event_time_next))
300 target = s68k_target;
301 if (event_time_next && CYCLES_GT(target, event_time_next))
302 target = event_time_next;
305 if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0)
309 return s68k_target - now;
313 #define pcd_run_cpus_normal pcd_run_cpus
314 //#define pcd_run_cpus_lockstep pcd_run_cpus
316 static void SekSyncM68k(void);
318 void pcd_run_cpus_normal(int m68k_cycles)
320 SekCycleAim += m68k_cycles;
321 if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12)
322 Pico_mcd->m.m68k_poll_cnt = 0;
323 else if (Pico_mcd->m.m68k_poll_cnt >= 16) {
324 int s68k_left = pcd_sync_s68k(SekCycleAim, 1);
325 if (s68k_left <= 0) {
326 elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x",
327 Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc);
328 SekCycleCnt = SekCycleAim;
331 SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16);
334 while (CYCLES_GT(SekCycleAim, SekCycleCnt)) {
336 if (Pico_mcd->m.need_sync) {
337 Pico_mcd->m.need_sync = 0;
338 pcd_sync_s68k(SekCycleCnt, 0);
343 void pcd_run_cpus_lockstep(int m68k_cycles)
345 unsigned int target = SekCycleAim + m68k_cycles;
349 pcd_sync_s68k(SekCycleAim, 0);
350 } while (CYCLES_GT(target, SekCycleAim));
352 SekCycleAim = target;
356 #define CPUS_RUN(m68k_cycles) \
357 pcd_run_cpus(m68k_cycles)
359 #include "../pico_cmn.c"
362 void pcd_prepare_frame(void)
364 pcd_set_cycle_mult();
366 // need this because we can't have direct mapping between
367 // master<->slave cycle counters because of overflows
368 mcd_m68k_cycle_base = SekCycleAim;
369 mcd_s68k_cycle_base = SekCycleAimS68k;
372 PICO_INTERNAL void PicoFrameMCD(void)
380 void pcd_state_loaded(void)
385 pcd_set_cycle_mult();
386 pcd_state_loaded_mem();
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;
391 Pico_mcd->pcm_regs_dirty = 1;
394 cycles = pcd_cycles_m68k_to_s68k(SekCycleAim);
395 diff = cycles - SekCycleAimS68k;
396 if (diff < -1000 || diff > 1000) {
397 SekCycleCntS68k = SekCycleAimS68k = cycles;
399 if (pcd_event_times[PCD_EVENT_CDC] == 0) {
400 pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75);
402 if (Pico_mcd->s68k_regs[0x31])
403 pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3,
404 Pico_mcd->s68k_regs[0x31] * 384);
407 diff = cycles - Pico_mcd->pcm.update_cycles;
408 if ((unsigned int)diff > 12500000/50)
409 Pico_mcd->pcm.update_cycles = cycles;
413 pcd_run_events(SekCycleCntS68k);
416 // vim:shiftwidth=2:ts=2:expandtab