some more risky timing changes

[picodrive.git] / pico / cd / mcd.c

diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c
index 24e99e4..6d23604 100644 (file)
--- a/pico/cd/mcd.c
+++ b/pico/cd/mcd.c
@@ -22,13 +22,10 @@ void (*PicoMCDcloseTray)(void) = NULL;
 PICO_INTERNAL void PicoInitMCD(void)
 {
   SekInitS68k();
-  Init_CD_Driver();
-  gfx_init();
 }
 
 PICO_INTERNAL void PicoExitMCD(void)
 {
-  End_CD_Driver();
 }
 
 PICO_INTERNAL void PicoPowerMCD(void)
@@ -46,7 +43,8 @@ PICO_INTERNAL void PicoPowerMCD(void)
   memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
   memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
 
-  Reset_CD();
+  cdc_init();
+  gfx_init();
 
   // cold reset state (tested)
   Pico_mcd->m.state_flags = PCD_ST_S68K_RST;
@@ -57,13 +55,18 @@ PICO_INTERNAL void PicoPowerMCD(void)
 
 void pcd_soft_reset(void)
 {
-  // Reset_CD(); // breaks Fahrenheit CD swap
+  elprintf(EL_CD, "cd: soft reset");
 
-  LC89510_Reset();
+  Pico_mcd->m.s68k_pend_ints = 0;
+  cdc_reset();
+  cdd_reset();
 #ifdef _ASM_CD_MEMORY_C
   //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
 #endif
 
+  memset(&Pico_mcd->s68k_regs[0x38], 0, 9);
+  Pico_mcd->s68k_regs[0x38+9] = 0x0f;  // default checksum
+
   pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75);
 
   // TODO: test if register state/timers change
@@ -87,7 +90,32 @@ PICO_INTERNAL int PicoResetMCD(void)
   return 0;
 }
 
-static __inline void SekRunS68k(unsigned int to)
+static void SekRunM68kOnce(void)
+{
+  int cyc_do;
+  pevt_log_m68k_o(EVT_RUN_START);
+
+  if ((cyc_do = SekCycleAim - SekCycleCnt) > 0) {
+    SekCycleCnt += cyc_do;
+
+#if defined(EMU_C68K)
+    PicoCpuCM68k.cycles = cyc_do;
+    CycloneRun(&PicoCpuCM68k);
+    SekCycleCnt -= PicoCpuCM68k.cycles;
+#elif defined(EMU_M68K)
+    SekCycleCnt += m68k_execute(cyc_do) - cyc_do;
+#elif defined(EMU_F68K)
+    SekCycleCnt += fm68k_emulate(cyc_do, 0) - cyc_do;
+#endif
+  }
+
+  SekCyclesLeft = 0;
+
+  SekTrace(0);
+  pevt_log_m68k_o(EVT_RUN_END);
+}
+
+static void SekRunS68k(unsigned int to)
 {
   int cyc_do;
 
@@ -118,7 +146,7 @@ static void pcd_set_cycle_mult(void)
 {
   // ~1.63 for NTSC, ~1.645 for PAL
   if (Pico.m.pal)
-    mcd_m68k_cycle_mult = ((12500000ull << 16) / (50*312*488));
+    mcd_m68k_cycle_mult = ((12500000ull << 16) / (50*313*488));
   else
     mcd_m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1;
 }
@@ -132,7 +160,20 @@ unsigned int pcd_cycles_m68k_to_s68k(unsigned int c)
 static void pcd_cdc_event(unsigned int now)
 {
   // 75Hz CDC update
-  Check_CD_Command();
+  cdd_update();
+
+  /* check if a new CDD command has been processed */
+  if (!(Pico_mcd->s68k_regs[0x4b] & 0xf0))
+  {
+    /* reset CDD command wait flag */
+    Pico_mcd->s68k_regs[0x4b] = 0xf0;
+
+    if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) {
+      elprintf(EL_INTS|EL_CD, "s68k: cdd irq 4");
+      SekInterruptS68k(4);
+    }
+  }
+
   pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75);
 }
 
@@ -150,8 +191,7 @@ static void pcd_int3_timer_event(unsigned int now)
 
 static void pcd_dma_event(unsigned int now)
 {
-  int ddx = Pico_mcd->s68k_regs[4] & 7;
-       Update_CDC_TRansfer(ddx);
+  cdc_dma_update();
 }
 
 typedef void (event_cb)(unsigned int now);
@@ -290,7 +330,13 @@ void pcd_run_cpus_normal(int m68k_cycles)
     SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16);
   }
 
-  SekSyncM68k();
+  while (CYCLES_GT(SekCycleAim, SekCycleCnt)) {
+    SekRunM68kOnce();
+    if (Pico_mcd->m.need_sync) {
+      Pico_mcd->m.need_sync = 0;
+      pcd_sync_s68k(SekCycleCnt, 0);
+    }
+  }
 }
 
 void pcd_run_cpus_lockstep(int m68k_cycles)
@@ -355,9 +401,6 @@ void pcd_state_loaded(void)
     if (Pico_mcd->s68k_regs[0x31])
       pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3,
         Pico_mcd->s68k_regs[0x31] * 384);
-
-    if (Pico_mcd->scd.Status_CDC & 0x08)
-           Update_CDC_TRansfer(Pico_mcd->s68k_regs[4] & 7);
   }
 
   diff = cycles - Pico_mcd->pcm.update_cycles;