FAMEC idle loops, PSP port sync, minor adjustments

[picodrive.git] / Pico / MemoryCmn.c

diff --git a/Pico/MemoryCmn.c b/Pico/MemoryCmn.c
index dcd5d75..6493207 100644 (file)
--- a/Pico/MemoryCmn.c
+++ b/Pico/MemoryCmn.c
@@ -46,7 +46,7 @@ static
 u32 z80ReadBusReq(void)
 {
   u32 d=Pico.m.z80Run&1;
-  if (!d && Pico.m.scanline != -1) {
+  if (!d) {
     // needed by buggy Terminator (Sega CD)
     int stop_before = SekCyclesDone() - z80stopCycle;
     //elprintf(EL_BUSREQ, "get_zrun: stop before: %i", stop_before);
@@ -55,7 +55,7 @@ u32 z80ReadBusReq(void)
     if (stop_before > 0 && stop_before < 20) // Gens uses 16 here
       d = 1; // bus not yet available
   }
-  // |=0x80 for Shadow of the Beast & Super Offroad
+
   elprintf(EL_BUSREQ, "get_zrun: %02x [%i] @%06x", d|0x80, SekCyclesDone(), SekPc);
   return d|0x80;
 }
@@ -69,24 +69,14 @@ void z80WriteBusReq(u32 d)
   {
     if (!d)
     {
-      // this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)
-      if (Pico.m.z80Run) {
-        int lineCycles;
+      if ((PicoOpt&POPT_EN_Z80) && Pico.m.z80Run)
+      {
         z80stopCycle = SekCyclesDone();
-        if ((Pico.m.z80Run&2) && Pico.m.scanline != -1)
-             lineCycles=(488-SekCyclesLeft)&0x1ff;
-        else lineCycles=z80stopCycle-z80startCycle; // z80 was started at current line
-        if (lineCycles > 0) { // && lineCycles <= 488) {
-          //dprintf("zrun: %i/%i cycles", lineCycles, (lineCycles>>1)-(lineCycles>>5));
-          lineCycles=(lineCycles>>1)-(lineCycles>>5);
-          z80_run_nr(lineCycles);
-        }
+       PicoSyncZ80(z80stopCycle);
       }
     } else {
       if (!Pico.m.z80Run)
-        z80startCycle = SekCyclesDone();
-      else
-        d|=Pico.m.z80Run;
+        z80_cycle_cnt = cycles_68k_to_z80(SekCyclesDone());
     }
   }
   elprintf(EL_BUSREQ, "set_zrun: %i->%i [%i] @%06x", Pico.m.z80Run, d, SekCyclesDone(), SekPc);
@@ -118,14 +108,14 @@ u32 OtherRead16(u32 a, int realsize)
     goto end;
   }
 
-  if ((a&0xff0000)==0xa00000) {
+  if ((a&0xff0000)==0xa00000)
+  {
+    if (Pico.m.z80Run&1)
+      elprintf(EL_ANOMALY, "68k z80 read with no bus! [%06x] @ %06x", a, SekPc);
     if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)
-    if ((a&0x6000)==0x4000) { // 0x4000-0x5fff, Fudge if disabled
-      if(PicoOpt&POPT_EN_FM) d=YM2612Read();
-      else d=Pico.m.rotate++&3;
-      elprintf(EL_YM2612R, "read ym2612: %02x", d);
-      goto end;
-    }
+    if ((a&0x6000)==0x4000) { d=ym2612_read_local_68k(); goto end; } // 0x4000-0x5fff
+
+    elprintf(EL_ANOMALY, "68k bad read [%06x]", a);
     d=0xffff;
     goto end;
   }
@@ -140,7 +130,7 @@ static void IoWrite8(u32 a, u32 d)
 {
   a=(a>>1)&0xf;
   // 6 button gamepad: if TH went from 0 to 1, gamepad changes state
-  if(PicoOpt&POPT_6BTN_PAD)
+  if (PicoOpt&POPT_6BTN_PAD)
   {
     if (a==1) {
       Pico.m.padDelay[0] = 0;
@@ -161,14 +151,25 @@ void OtherWrite8(u32 a,u32 d)
 {
 #if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
   if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
-  if ((a&0xff4000)==0xa00000)  { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram
-  if ((a&0xff6000)==0xa04000)  { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d)&1; return; } // FM Sound
+  if ((a&0xff4000)==0xa00000) { // z80 RAM
+    SekCyclesBurn(2); // hack
+    if (!(Pico.m.z80Run&1) && !Pico.m.z80_reset) Pico.zram[a&0x1fff]=(u8)d;
+    else elprintf(EL_ANOMALY, "68k z80 write with no bus or reset! [%06x] %02x @ %06x", a, d&0xff, SekPc);
+    return;
+  }
+  if ((a&0xff6000)==0xa04000)  { if(PicoOpt&1) emustatus|=ym2612_write_local(a&3, d&0xff, 0)&1; return; } // FM Sound
   if ((a&0xffffe0)==0xa10000)  { IoWrite8(a, d); return; } // I/O ports
 #endif
   if (a==0xa11100)             { z80WriteBusReq(d); return; }
   if (a==0xa11200) {
     elprintf(EL_BUSREQ, "write z80Reset: %02x", d);
-    if(!(d&1)) z80_reset();
+    if (!(d&0x1)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
+    else if (Pico.m.z80_reset) {
+      Pico.m.z80_reset = 0;
+      YM2612ResetChip();
+      z80_reset();
+      timers_reset();
+    }
     return;
   }
 #if !defined(_ASM_MEMORY_C) || defined(_ASM_MEMORY_C_AMIPS)
@@ -177,6 +178,7 @@ void OtherWrite8(u32 a,u32 d)
     Pico.m.z80_bank68k>>=1;
     Pico.m.z80_bank68k|=(d&1)<<8;
     Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
+    elprintf(EL_Z80BNK, "z80 bank=%06x", Pico.m.z80_bank68k<<15);
     return;
   }
 #endif
@@ -186,7 +188,7 @@ void OtherWrite8(u32 a,u32 d)
     return;
   }
 
-  PicoWrite8Hook(a, d, 8);
+  PicoWrite8Hook(a, d&0xff, 8);
 }
 
 
@@ -196,16 +198,31 @@ static
 void OtherWrite16(u32 a,u32 d)
 {
   if (a==0xa11100)            { z80WriteBusReq(d>>8); return; }
-  if (a==0xa11200)            { elprintf(EL_BUSREQ, "write z80reset: %04x", d); if(!(d&0x100)) z80_reset(); return; }
   if ((a&0xffffe0)==0xa10000) { IoWrite8(a, d); return; } // I/O ports
-  if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)
   if ((a&0xe700f8)==0xc00010||(a&0xff7ff8)==0xa07f10) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound
-  if ((a&0xff6000)==0xa04000)  { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d)&1; return; } // FM Sound (??)
+  if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=ym2612_write_local(a&3, d&0xff, 0)&1; return; } // FM Sound
+  if ((a&0xff4000)==0xa00000) { // Z80 ram (MSB only)
+    if (!(Pico.m.z80Run&1) && !Pico.m.z80_reset) Pico.zram[a&0x1fff]=(u8)(d>>8);
+    else elprintf(EL_ANOMALY, "68k z80 write with no bus or reset! [%06x] %04x @ %06x", a, d&0xffff, SekPc);
+    return;
+  }
+  if (a==0xa11200) {
+    elprintf(EL_BUSREQ, "write z80reset: %04x", d);
+    if (!(d&0x100)) { Pico.m.z80_reset = 1; Pico.m.z80Run = 0; YM2612ResetChip(); }
+    else if (Pico.m.z80_reset) {
+      Pico.m.z80_reset = 0;
+      YM2612ResetChip();
+      z80_reset();
+      timers_reset();
+    }
+    return;
+  }
   if ((a&0xff7f00)==0xa06000) // Z80 BANK register
   {
     Pico.m.z80_bank68k>>=1;
     Pico.m.z80_bank68k|=(d&1)<<8;
     Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
+    elprintf(EL_Z80BNK, "z80 bank=%06x", Pico.m.z80_bank68k<<15);
     return;
   }
 
@@ -224,6 +241,6 @@ void OtherWrite16(u32 a,u32 d)
   }
 #endif
 
-  PicoWrite16Hook(a, d, 16);
+  PicoWrite16Hook(a, d&0xffff, 16);
 }