| 1 | /* |
| 2 | * PicoDrive |
| 3 | * (C) notaz, 2007,2013 |
| 4 | * |
| 5 | * This work is licensed under the terms of MAME license. |
| 6 | * See COPYING file in the top-level directory. |
| 7 | */ |
| 8 | |
| 9 | #include "../pico_int.h" |
| 10 | #include "../sound/ym2612.h" |
| 11 | |
| 12 | extern unsigned char formatted_bram[4*0x10]; |
| 13 | |
| 14 | static unsigned int m68k_cycle_mult; |
| 15 | |
| 16 | void (*PicoMCDopenTray)(void) = NULL; |
| 17 | void (*PicoMCDcloseTray)(void) = NULL; |
| 18 | |
| 19 | |
| 20 | PICO_INTERNAL void PicoInitMCD(void) |
| 21 | { |
| 22 | SekInitS68k(); |
| 23 | Init_CD_Driver(); |
| 24 | gfx_init(); |
| 25 | } |
| 26 | |
| 27 | PICO_INTERNAL void PicoExitMCD(void) |
| 28 | { |
| 29 | End_CD_Driver(); |
| 30 | } |
| 31 | |
| 32 | PICO_INTERNAL void PicoPowerMCD(void) |
| 33 | { |
| 34 | SekCycleCntS68k = SekCycleAimS68k = 0; |
| 35 | |
| 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)); |
| 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)); |
| 46 | |
| 47 | Reset_CD(); |
| 48 | |
| 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 |
| 53 | memset(Pico_mcd->bios + 0x70, 0xff, 4); |
| 54 | } |
| 55 | |
| 56 | void pcd_soft_reset(void) |
| 57 | { |
| 58 | // Reset_CD(); // breaks Fahrenheit CD swap |
| 59 | |
| 60 | LC89510_Reset(); |
| 61 | #ifdef _ASM_CD_MEMORY_C |
| 62 | //PicoMemResetCDdecode(1); // don't have to call this in 2M mode |
| 63 | #endif |
| 64 | |
| 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 | |
| 74 | // use SRam.data for RAM cart |
| 75 | if (PicoOpt & POPT_EN_MCD_RAMCART) { |
| 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 | } |
| 83 | SRam.start = SRam.end = 0; // unused |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static __inline void SekRunS68k(unsigned int to) |
| 89 | { |
| 90 | int cyc_do; |
| 91 | |
| 92 | SekCycleAimS68k = to; |
| 93 | if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0) |
| 94 | return; |
| 95 | |
| 96 | if (SekShouldInterrupt()) |
| 97 | Pico_mcd->m.s68k_poll_a = 0; |
| 98 | |
| 99 | SekCycleCntS68k += cyc_do; |
| 100 | #if defined(EMU_C68K) |
| 101 | PicoCpuCS68k.cycles = cyc_do; |
| 102 | CycloneRun(&PicoCpuCS68k); |
| 103 | SekCycleCntS68k -= PicoCpuCS68k.cycles; |
| 104 | #elif defined(EMU_M68K) |
| 105 | m68k_set_context(&PicoCpuMS68k); |
| 106 | SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do; |
| 107 | m68k_set_context(&PicoCpuMM68k); |
| 108 | #elif defined(EMU_F68K) |
| 109 | g_m68kcontext = &PicoCpuFS68k; |
| 110 | SekCycleCntS68k += fm68k_emulate(cyc_do, 0, 0) - cyc_do; |
| 111 | g_m68kcontext = &PicoCpuFM68k; |
| 112 | #endif |
| 113 | } |
| 114 | |
| 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 | } |
| 123 | |
| 124 | unsigned int pcd_cycles_m68k_to_s68k(unsigned int c) |
| 125 | { |
| 126 | return (long long)c * m68k_cycle_mult >> 16; |
| 127 | } |
| 128 | |
| 129 | /* events */ |
| 130 | static void pcd_cdc_event(unsigned int now) |
| 131 | { |
| 132 | // 75Hz CDC update |
| 133 | Check_CD_Command(); |
| 134 | pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75); |
| 135 | } |
| 136 | |
| 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 | } |
| 143 | |
| 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 | |
| 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 | } |
| 154 | |
| 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, |
| 163 | [PCD_EVENT_GFX] = gfx_update, |
| 164 | [PCD_EVENT_DMA] = pcd_dma_event, |
| 165 | }; |
| 166 | |
| 167 | void pcd_event_schedule(unsigned int now, enum pcd_event event, int after) |
| 168 | { |
| 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 | } |
| 177 | |
| 178 | when |= 1; |
| 179 | |
| 180 | elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when); |
| 181 | pcd_event_times[event] = when; |
| 182 | |
| 183 | if (event_time_next == 0 || CYCLES_GT(event_time_next, when)) |
| 184 | event_time_next = when; |
| 185 | } |
| 186 | |
| 187 | void pcd_event_schedule_s68k(enum pcd_event event, int after) |
| 188 | { |
| 189 | if (SekCyclesLeftS68k > after) |
| 190 | SekEndRunS68k(after); |
| 191 | |
| 192 | pcd_event_schedule(SekCyclesDoneS68k(), event, after); |
| 193 | } |
| 194 | |
| 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 | } |
| 228 | |
| 229 | if (oldest != -1) |
| 230 | elprintf(EL_CD, "cd: next event #%d at %u", |
| 231 | oldest, event_time_next); |
| 232 | } |
| 233 | |
| 234 | int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync) |
| 235 | { |
| 236 | #define now SekCycleCntS68k |
| 237 | unsigned int s68k_target = |
| 238 | (unsigned long long)m68k_target * m68k_cycle_mult >> 16; |
| 239 | unsigned int target; |
| 240 | |
| 241 | elprintf(EL_CD, "s68k sync to %u, %u->%u", |
| 242 | m68k_target, now, s68k_target); |
| 243 | |
| 244 | if (Pico_mcd->m.busreq != 1) { /* busreq/reset */ |
| 245 | SekCycleCntS68k = SekCycleAimS68k = s68k_target; |
| 246 | pcd_run_events(m68k_target); |
| 247 | return 0; |
| 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); |
| 259 | if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0) |
| 260 | break; |
| 261 | } |
| 262 | |
| 263 | return s68k_target - now; |
| 264 | #undef now |
| 265 | } |
| 266 | |
| 267 | #define pcd_run_cpus_normal pcd_run_cpus |
| 268 | //#define pcd_run_cpus_lockstep pcd_run_cpus |
| 269 | |
| 270 | static void SekSyncM68k(void); |
| 271 | |
| 272 | void pcd_run_cpus_normal(int m68k_cycles) |
| 273 | { |
| 274 | SekCycleAim += m68k_cycles; |
| 275 | if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12) |
| 276 | Pico_mcd->m.m68k_poll_cnt = 0; |
| 277 | else if (Pico_mcd->m.m68k_poll_cnt >= 16) { |
| 278 | int s68k_left = pcd_sync_s68k(SekCycleAim, 1); |
| 279 | if (s68k_left <= 0) { |
| 280 | elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x", |
| 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 | |
| 291 | void pcd_run_cpus_lockstep(int m68k_cycles) |
| 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)); |
| 299 | |
| 300 | SekCycleAim = target; |
| 301 | } |
| 302 | |
| 303 | #define PICO_CD |
| 304 | #define CPUS_RUN(m68k_cycles) \ |
| 305 | pcd_run_cpus(m68k_cycles) |
| 306 | |
| 307 | #include "../pico_cmn.c" |
| 308 | |
| 309 | |
| 310 | PICO_INTERNAL void PicoFrameMCD(void) |
| 311 | { |
| 312 | if (!(PicoOpt&POPT_ALT_RENDERER)) |
| 313 | PicoFrameStart(); |
| 314 | |
| 315 | pcd_set_cycle_mult(); |
| 316 | PicoFrameHints(); |
| 317 | } |
| 318 | |
| 319 | void pcd_state_loaded(void) |
| 320 | { |
| 321 | unsigned int cycles; |
| 322 | int diff; |
| 323 | |
| 324 | pcd_set_cycle_mult(); |
| 325 | pcd_state_loaded_mem(); |
| 326 | |
| 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; |
| 330 | Pico_mcd->pcm_regs_dirty = 1; |
| 331 | |
| 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 | |
| 345 | if (Pico_mcd->scd.Status_CDC & 0x08) |
| 346 | Update_CDC_TRansfer(Pico_mcd->s68k_regs[4] & 7); |
| 347 | } |
| 348 | if (Pico_mcd->pcm.update_cycles == 0) |
| 349 | Pico_mcd->pcm.update_cycles = cycles; |
| 350 | |
| 351 | // reschedule |
| 352 | event_time_next = 0; |
| 353 | pcd_run_events(SekCycleCntS68k); |
| 354 | } |
| 355 | |
| 356 | // vim:shiftwidth=2:ts=2:expandtab |