| 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 | } |
| 25 | |
| 26 | PICO_INTERNAL void PicoExitMCD(void) |
| 27 | { |
| 28 | End_CD_Driver(); |
| 29 | } |
| 30 | |
| 31 | PICO_INTERNAL void PicoPowerMCD(void) |
| 32 | { |
| 33 | int fmt_size = sizeof(formatted_bram); |
| 34 | memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram)); |
| 35 | memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); |
| 36 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
| 37 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
| 38 | memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size); |
| 39 | } |
| 40 | |
| 41 | PICO_INTERNAL int PicoResetMCD(void) |
| 42 | { |
| 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 | memset(Pico_mcd->bios + 0x70, 0xff, 4); // reset hint vector (simplest way to implement reg6) |
| 48 | Pico_mcd->m.state_flags = 0; |
| 49 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset |
| 50 | |
| 51 | Reset_CD(); |
| 52 | LC89510_Reset(); |
| 53 | gfx_cd_reset(); |
| 54 | #ifdef _ASM_CD_MEMORY_C |
| 55 | //PicoMemResetCDdecode(1); // don't have to call this in 2M mode |
| 56 | #endif |
| 57 | |
| 58 | // use SRam.data for RAM cart |
| 59 | if (PicoOpt & POPT_EN_MCD_RAMCART) { |
| 60 | if (SRam.data == NULL) |
| 61 | SRam.data = calloc(1, 0x12000); |
| 62 | } |
| 63 | else if (SRam.data != NULL) { |
| 64 | free(SRam.data); |
| 65 | SRam.data = NULL; |
| 66 | } |
| 67 | SRam.start = SRam.end = 0; // unused |
| 68 | |
| 69 | pcd_event_schedule(0, PCD_EVENT_CDC, 12500000/75); |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static __inline void SekRunS68k(unsigned int to) |
| 75 | { |
| 76 | int cyc_do; |
| 77 | |
| 78 | SekCycleAimS68k = to; |
| 79 | if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0) |
| 80 | return; |
| 81 | |
| 82 | SekCycleCntS68k += cyc_do; |
| 83 | #if defined(EMU_C68K) |
| 84 | PicoCpuCS68k.cycles = cyc_do; |
| 85 | CycloneRun(&PicoCpuCS68k); |
| 86 | SekCycleCntS68k -= PicoCpuCS68k.cycles; |
| 87 | #elif defined(EMU_M68K) |
| 88 | m68k_set_context(&PicoCpuMS68k); |
| 89 | SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do; |
| 90 | m68k_set_context(&PicoCpuMM68k); |
| 91 | #elif defined(EMU_F68K) |
| 92 | g_m68kcontext = &PicoCpuFS68k; |
| 93 | SekCycleCntS68k += fm68k_emulate(cyc_do, 0, 0) - cyc_do; |
| 94 | g_m68kcontext = &PicoCpuFM68k; |
| 95 | #endif |
| 96 | } |
| 97 | |
| 98 | |
| 99 | unsigned int pcd_cycles_m68k_to_s68k(unsigned int c) |
| 100 | { |
| 101 | return (long long)c * m68k_cycle_mult >> 16; |
| 102 | } |
| 103 | |
| 104 | /* events */ |
| 105 | static void pcd_cdc_event(unsigned int now) |
| 106 | { |
| 107 | // 75Hz CDC update |
| 108 | Check_CD_Command(); |
| 109 | pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75); |
| 110 | } |
| 111 | |
| 112 | static void pcd_int3_timer_event(unsigned int now) |
| 113 | { |
| 114 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) { |
| 115 | elprintf(EL_INTS|EL_CD, "s68k: timer irq 3"); |
| 116 | SekInterruptS68k(3); |
| 117 | } |
| 118 | |
| 119 | if (Pico_mcd->s68k_regs[0x31] != 0) |
| 120 | pcd_event_schedule(now, PCD_EVENT_TIMER3, |
| 121 | Pico_mcd->s68k_regs[0x31] * 384); |
| 122 | } |
| 123 | |
| 124 | static void pcd_gfx_event(unsigned int now) |
| 125 | { |
| 126 | // update gfx chip |
| 127 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) { |
| 128 | Pico_mcd->rot_comp.Reg_58 &= 0x7fff; |
| 129 | Pico_mcd->rot_comp.Reg_64 = 0; |
| 130 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) { |
| 131 | elprintf(EL_INTS |EL_CD, "s68k: gfx_cd irq 1"); |
| 132 | SekInterruptS68k(1); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | static void pcd_dma_event(unsigned int now) |
| 138 | { |
| 139 | int ddx = Pico_mcd->s68k_regs[4] & 7; |
| 140 | Update_CDC_TRansfer(ddx); |
| 141 | } |
| 142 | |
| 143 | typedef void (event_cb)(unsigned int now); |
| 144 | |
| 145 | /* times are in s68k (12.5MHz) cycles */ |
| 146 | unsigned int pcd_event_times[PCD_EVENT_COUNT]; |
| 147 | static unsigned int event_time_next; |
| 148 | static event_cb *pcd_event_cbs[PCD_EVENT_COUNT] = { |
| 149 | [PCD_EVENT_CDC] = pcd_cdc_event, |
| 150 | [PCD_EVENT_TIMER3] = pcd_int3_timer_event, |
| 151 | [PCD_EVENT_GFX] = pcd_gfx_event, |
| 152 | [PCD_EVENT_DMA] = pcd_dma_event, |
| 153 | }; |
| 154 | |
| 155 | void pcd_event_schedule(unsigned int now, enum pcd_event event, int after) |
| 156 | { |
| 157 | unsigned int when; |
| 158 | |
| 159 | when = now + after; |
| 160 | if (when == 0) { |
| 161 | // event cancelled |
| 162 | pcd_event_times[event] = 0; |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | when |= 1; |
| 167 | |
| 168 | elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when); |
| 169 | pcd_event_times[event] = when; |
| 170 | |
| 171 | if (event_time_next == 0 || CYCLES_GT(event_time_next, when)) |
| 172 | event_time_next = when; |
| 173 | } |
| 174 | |
| 175 | void pcd_event_schedule_s68k(enum pcd_event event, int after) |
| 176 | { |
| 177 | if (SekCyclesLeftS68k > after) |
| 178 | SekEndRunS68k(after); |
| 179 | |
| 180 | pcd_event_schedule(SekCyclesDoneS68k(), event, after); |
| 181 | } |
| 182 | |
| 183 | static void pcd_run_events(unsigned int until) |
| 184 | { |
| 185 | int oldest, oldest_diff, time; |
| 186 | int i, diff; |
| 187 | |
| 188 | while (1) { |
| 189 | oldest = -1, oldest_diff = 0x7fffffff; |
| 190 | |
| 191 | for (i = 0; i < PCD_EVENT_COUNT; i++) { |
| 192 | if (pcd_event_times[i]) { |
| 193 | diff = pcd_event_times[i] - until; |
| 194 | if (diff < oldest_diff) { |
| 195 | oldest_diff = diff; |
| 196 | oldest = i; |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | if (oldest_diff <= 0) { |
| 202 | time = pcd_event_times[oldest]; |
| 203 | pcd_event_times[oldest] = 0; |
| 204 | elprintf(EL_CD, "cd: run event #%d %u", oldest, time); |
| 205 | pcd_event_cbs[oldest](time); |
| 206 | } |
| 207 | else if (oldest_diff < 0x7fffffff) { |
| 208 | event_time_next = pcd_event_times[oldest]; |
| 209 | break; |
| 210 | } |
| 211 | else { |
| 212 | event_time_next = 0; |
| 213 | break; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | if (oldest != -1) |
| 218 | elprintf(EL_CD, "cd: next event #%d at %u", |
| 219 | oldest, event_time_next); |
| 220 | } |
| 221 | |
| 222 | int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync) |
| 223 | { |
| 224 | #define now SekCycleCntS68k |
| 225 | unsigned int s68k_target = |
| 226 | (unsigned long long)m68k_target * m68k_cycle_mult >> 16; |
| 227 | unsigned int target; |
| 228 | |
| 229 | elprintf(EL_CD, "s68k sync to %u, %u->%u", |
| 230 | m68k_target, now, s68k_target); |
| 231 | |
| 232 | if ((Pico_mcd->m.busreq & 3) != 1) { /* busreq/reset */ |
| 233 | SekCycleCntS68k = SekCycleAimS68k = s68k_target; |
| 234 | pcd_run_events(m68k_target); |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | while (CYCLES_GT(s68k_target, now)) { |
| 239 | if (event_time_next && CYCLES_GE(now, event_time_next)) |
| 240 | pcd_run_events(now); |
| 241 | |
| 242 | target = s68k_target; |
| 243 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
| 244 | target = event_time_next; |
| 245 | |
| 246 | SekRunS68k(target); |
| 247 | if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0) |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | return s68k_target - now; |
| 252 | #undef now |
| 253 | } |
| 254 | |
| 255 | static void SekSyncM68k(void); |
| 256 | |
| 257 | static void pcd_run_cpus(int m68k_cycles) |
| 258 | { |
| 259 | SekCycleAim += m68k_cycles; |
| 260 | if (Pico_mcd->m.m68k_poll_cnt >= 16 && !SekShouldInterrupt()) { |
| 261 | int s68k_left = pcd_sync_s68k(SekCycleAim, 1); |
| 262 | if (s68k_left <= 0) { |
| 263 | elprintf(EL_CDPOLL, "m68k poll [%02x] %d @%06x", |
| 264 | Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc); |
| 265 | SekCycleCnt = SekCycleAim; |
| 266 | return; |
| 267 | } |
| 268 | SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16); |
| 269 | } |
| 270 | |
| 271 | SekSyncM68k(); |
| 272 | } |
| 273 | |
| 274 | #define PICO_CD |
| 275 | #define CPUS_RUN(m68k_cycles) \ |
| 276 | pcd_run_cpus(m68k_cycles) |
| 277 | |
| 278 | #include "../pico_cmn.c" |
| 279 | |
| 280 | |
| 281 | PICO_INTERNAL void PicoFrameMCD(void) |
| 282 | { |
| 283 | if (!(PicoOpt&POPT_ALT_RENDERER)) |
| 284 | PicoFrameStart(); |
| 285 | |
| 286 | // ~1.63 for NTSC, ~1.645 for PAL |
| 287 | if (Pico.m.pal) |
| 288 | m68k_cycle_mult = ((12500000ull << 16) / (50*312*488)); |
| 289 | else |
| 290 | m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1; |
| 291 | |
| 292 | PicoFrameHints(); |
| 293 | } |
| 294 | |
| 295 | void pcd_state_loaded(void) |
| 296 | { |
| 297 | unsigned int cycles; |
| 298 | int diff; |
| 299 | |
| 300 | pcd_state_loaded_mem(); |
| 301 | |
| 302 | // old savestates.. |
| 303 | cycles = pcd_cycles_m68k_to_s68k(SekCycleAim); |
| 304 | diff = cycles - SekCycleAimS68k; |
| 305 | if (diff < -1000 || diff > 1000) { |
| 306 | SekCycleCntS68k = SekCycleAimS68k = cycles; |
| 307 | } |
| 308 | if (pcd_event_times[PCD_EVENT_CDC] == 0) { |
| 309 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75); |
| 310 | |
| 311 | if (Pico_mcd->s68k_regs[0x31]) |
| 312 | pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3, |
| 313 | Pico_mcd->s68k_regs[0x31] * 384); |
| 314 | |
| 315 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) { |
| 316 | Pico_mcd->rot_comp.Reg_58 &= 0x7fff; |
| 317 | Pico_mcd->rot_comp.Reg_64 = 0; |
| 318 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) |
| 319 | SekInterruptS68k(1); |
| 320 | } |
| 321 | if (Pico_mcd->scd.Status_CDC & 0x08) |
| 322 | Update_CDC_TRansfer(Pico_mcd->s68k_regs[4] & 7); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | // vim:shiftwidth=2:ts=2:expandtab |