[picodrive.git] / Pico / cd / Pico.c

// This is part of Pico Library

// (c) Copyright 2004 Dave, All rights reserved.
// (c) Copyright 2007 notaz, All rights reserved.
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.


#include "../PicoInt.h"
#include "../sound/sound.h"


extern unsigned char formatted_bram[8*0x10];


int PicoInitMCD(void)
{
  SekInitS68k();
  Init_CD_Driver();

  return 0;
}


void PicoExitMCD(void)
{
  End_CD_Driver();
}

int PicoResetMCD(int hard)
{
  memset(Pico_mcd->prg_ram,  0, sizeof(Pico_mcd->prg_ram));
  memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
  memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
  if (hard) {
	  memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	  memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10);
  }
  memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
  memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));

  *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
  Pico_mcd->m.state_flags |= 2; // s68k reset pending
  Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
  Pico_mcd->m.counter75hz = 0;

  LC89510_Reset();
  Reset_CD();
  gfx_cd_reset();

  return 0;
}

static __inline void SekRun(int cyc)
{
  int cyc_do;
  SekCycleAim+=cyc;
  if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
#if defined(EMU_C68K)
  PicoCpu.cycles=cyc_do;
  CycloneRun(&PicoCpu);
  SekCycleCnt+=cyc_do-PicoCpu.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoM68kCPU);
  SekCycleCnt+=m68k_execute(cyc_do);
#endif
}

static __inline void SekRunS68k(int cyc)
{
  int cyc_do;
  SekCycleAimS68k+=cyc;
  if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
#if defined(EMU_C68K)
  PicoCpuS68k.cycles=cyc_do;
  CycloneRun(&PicoCpuS68k);
  SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoS68kCPU);
  SekCycleCntS68k+=m68k_execute(cyc_do);
#endif
}

static __inline void check_cd_dma(void)
{
	int ddx;

	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;

	ddx = Pico_mcd->s68k_regs[4] & 7;
	if (ddx <  2) return; // invalid
	if (ddx <  4) {
		Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
		return;
	}
	if (ddx == 6) return; // invalid

	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
}

static __inline void update_chips(void)
{
	int counter_timer, int3_set;
	int counter75hz_lim = Pico.m.pal ? 2080 : 2096;

	// 75Hz CDC update
	if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
		Pico_mcd->m.counter75hz -= counter75hz_lim;
		Check_CD_Command();
	}

	// update timers
	counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
	Pico_mcd->m.timer_stopwatch += counter_timer;
	if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
		Pico_mcd->m.timer_int3 -= counter_timer;
		if (Pico_mcd->m.timer_int3 < 0) {
			if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
				dprintf("s68k: timer irq 3");
				SekInterruptS68k(3);
				Pico_mcd->m.timer_int3 += int3_set << 16;
			}
			// is this really what happens if irq3 is masked out?
			Pico_mcd->m.timer_int3 &= 0xffffff;
		}
	}

	// update gfx chip
	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
		gfx_cd_update();
}


static int PicoFrameHintsMCD(void)
{
  struct PicoVideo *pv=&Pico.video;
  int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
  const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
  int skip=PicoSkipFrame || (PicoOpt&0x10);
  int hint; // Hint counter

  if(Pico.m.pal) { //
    //cycles_68k = (int) ((double) OSC_PAL  /  7 / 50 / 312 + 0.4); // should compile to a constant (488)
    //cycles_z80 = (int) ((double) OSC_PAL  / 15 / 50 / 312 + 0.4); // 228
    lines  = 312;    // Steve Snake says there are 313 lines, but this seems to also work well
    line_sample = 68;
    if(pv->reg[1]&8) lines_vis = 240;
  } else {
    //cycles_68k = (int) ((double) OSC_NTSC /  7 / 60 / 262 + 0.4); // 488
    //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
    lines  = 262;
    line_sample = 93;
  }

  SekCyclesReset();
  SekCyclesResetS68k();
  //z80ExtraCycles = 0;

  if(PicoOpt&4)
    z80CycleAim = 0;
//    z80_resetCycles();

  pv->status&=~0x88; // clear V-Int, come out of vblank

  hint=pv->reg[10]; // Load H-Int counter
  //dprintf("-hint: %i", hint);

  for (y=0;y<lines;y++)
  {
    Pico.m.scanline=(short)y;

    // pad delay (for 6 button pads)
    if(PicoOpt&0x20) {
      if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
      if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
    }

    check_cd_dma();

    // H-Interrupts:
    if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
    {
      //dprintf("rhint:old @ %06x", SekPc);
      hint=pv->reg[10]; // Reload H-Int counter
      pv->pending_ints|=0x10;
      if (pv->reg[0]&0x10) SekInterrupt(4);
      //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
      //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
    }

    // V-Interrupt:
    if (y == lines_vis)
    {
      //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
      pv->status|=0x88; // V-Int happened, go into vblank
      SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
      /*if(Pico.m.z80Run && (PicoOpt&4)) {
        z80CycleAim+=cycles_z80/2;
        total_z80+=z80_run(z80CycleAim-total_z80);
        z80CycleAim-=cycles_z80/2;
      }*/
      pv->pending_ints|=0x20;
      if(pv->reg[1]&0x20) SekInterrupt(6);
      if(Pico.m.z80Run && (PicoOpt&4)) // ?
        z80_int();
      //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
    }

    // decide if we draw this line
#if CAN_HANDLE_240_LINES
    if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
#else
    if(!skip && y<224)
#endif
      PicoLine(y);

    if(PicoOpt&1)
      sound_timers_and_dac(y);

    // get samples from sound chips
    if (y == 224 && PsndOut) {
      int len = sound_render(0, PsndLen);
      if (PicoWriteSound) PicoWriteSound(len);
      // clear sound buffer
      sound_clear();
    }

    // Run scanline:
      //dprintf("m68k starting exec @ %06x", SekPc);
    if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
    SekRun(cycles_68k);
    if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
#if 0
	    int i;
	    FILE *f = fopen("prg_ram.bin", "wb");
	    for (i = 0; i < 0x80000; i+=2)
	    {
		    int tmp = Pico_mcd->prg_ram[i];
		    Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
		    Pico_mcd->prg_ram[i+1] = tmp;
	    }
	    fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
	    fclose(f);
	    exit(1);
#endif
      //dprintf("s68k starting exec @ %06x", SekPcS68k);
      SekRunS68k(cycles_s68k);
    }

    if((PicoOpt&4) && Pico.m.z80Run) {
      Pico.m.z80Run|=2;
      z80CycleAim+=cycles_z80;
      total_z80+=z80_run(z80CycleAim-total_z80);
    }

    update_chips();
  }

  // draw a frame just after vblank in alternative render mode
  if(!PicoSkipFrame && (PicoOpt&0x10))
    PicoFrameFull();

  return 0;
}


int PicoFrameMCD(void)
{
  if(!(PicoOpt&0x10))
    PicoFrameStart();

  PicoFrameHintsMCD();

  return 0;
}
Commit	Line	Data
cc68a136	1	// This is part of Pico Library
	2
	3	// (c) Copyright 2004 Dave, All rights reserved.
672ad671	4	// (c) Copyright 2007 notaz, All rights reserved.
cc68a136	5	// Free for non-commercial use.
	6
	7	// For commercial use, separate licencing terms must be obtained.
	8
	9
	10	#include "../PicoInt.h"
	11	#include "../sound/sound.h"
	12
	13
51a902ae	14	extern unsigned char formatted_bram[8*0x10];
cc68a136	15
	16
	17	int PicoInitMCD(void)
	18	{
	19	SekInitS68k();
	20	Init_CD_Driver();
	21
	22	return 0;
	23	}
	24
	25
	26	void PicoExitMCD(void)
	27	{
	28	End_CD_Driver();
	29	}
	30
	31	int PicoResetMCD(int hard)
	32	{
51a902ae	33	memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
51a902ae	34	memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
4f265db7	35	memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
51a902ae	36	if (hard) {
	37	memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	38	memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 80x10, formatted_bram, 80x10);
	39	}
	40	memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
4f265db7	41	memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
51a902ae	42
d1df8786	43	(unsigned int )(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
51a902ae	44	Pico_mcd->m.state_flags \|= 2; // s68k reset pending
672ad671	45	Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
51a902ae	46	Pico_mcd->m.counter75hz = 0;
cc68a136	47
	48	LC89510_Reset();
	49	Reset_CD();
51a902ae	50	gfx_cd_reset();
cc68a136	51
	52	return 0;
	53	}
	54
	55	static __inline void SekRun(int cyc)
	56	{
	57	int cyc_do;
	58	SekCycleAim+=cyc;
	59	if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
b837b69b	60	#if defined(EMU_C68K)
	61	PicoCpu.cycles=cyc_do;
	62	CycloneRun(&PicoCpu);
	63	SekCycleCnt+=cyc_do-PicoCpu.cycles;
	64	#elif defined(EMU_M68K)
cc68a136	65	m68k_set_context(&PicoM68kCPU);
	66	SekCycleCnt+=m68k_execute(cyc_do);
	67	#endif
	68	}
	69
	70	static __inline void SekRunS68k(int cyc)
	71	{
	72	int cyc_do;
	73	SekCycleAimS68k+=cyc;
	74	if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
b837b69b	75	#if defined(EMU_C68K)
	76	PicoCpuS68k.cycles=cyc_do;
	77	CycloneRun(&PicoCpuS68k);
	78	SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
	79	#elif defined(EMU_M68K)
cc68a136	80	m68k_set_context(&PicoS68kCPU);
	81	SekCycleCntS68k+=m68k_execute(cyc_do);
	82	#endif
	83	}
	84
bf098bc5	85	static __inline void check_cd_dma(void)
	86	{
	87	int ddx;
	88
c459aefd	89	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
bf098bc5	90
	91	ddx = Pico_mcd->s68k_regs[4] & 7;
	92	if (ddx < 2) return; // invalid
c459aefd	93	if (ddx < 4) {
	94	Pico_mcd->s68k_regs[4] \|= 0x40; // Data set ready in host port
	95	return;
	96	}
bf098bc5	97	if (ddx == 6) return; // invalid
	98
	99	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
	100	}
	101
4f265db7	102	static __inline void update_chips(void)
	103	{
	104	int counter_timer, int3_set;
	105	int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
	106
	107	// 75Hz CDC update
	108	if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
	109	Pico_mcd->m.counter75hz -= counter75hz_lim;
	110	Check_CD_Command();
	111	}
	112
	113	// update timers
	114	counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
	115	Pico_mcd->m.timer_stopwatch += counter_timer;
	116	if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
	117	Pico_mcd->m.timer_int3 -= counter_timer;
	118	if (Pico_mcd->m.timer_int3 < 0) {
	119	if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
	120	dprintf("s68k: timer irq 3");
	121	SekInterruptS68k(3);
	122	Pico_mcd->m.timer_int3 += int3_set << 16;
	123	}
	124	// is this really what happens if irq3 is masked out?
	125	Pico_mcd->m.timer_int3 &= 0xffffff;
	126	}
	127	}
	128
	129	// update gfx chip
	130	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
	131	gfx_cd_update();
	132	}
	133
b837b69b	134
cc68a136	135	static int PicoFrameHintsMCD(void)
	136	{
	137	struct PicoVideo *pv=&Pico.video;
4f265db7	138	int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
cc68a136	139	const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
	140	int skip=PicoSkipFrame \|\| (PicoOpt&0x10);
	141	int hint; // Hint counter
	142
	143	if(Pico.m.pal) { //
	144	//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
	145	//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
	146	lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
	147	line_sample = 68;
	148	if(pv->reg[1]&8) lines_vis = 240;
	149	} else {
	150	//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
	151	//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
	152	lines = 262;
	153	line_sample = 93;
	154	}
	155
	156	SekCyclesReset();
	157	SekCyclesResetS68k();
	158	//z80ExtraCycles = 0;
	159
	160	if(PicoOpt&4)
	161	z80CycleAim = 0;
	162	// z80_resetCycles();
	163
	164	pv->status&=~0x88; // clear V-Int, come out of vblank
	165
	166	hint=pv->reg[10]; // Load H-Int counter
	167	//dprintf("-hint: %i", hint);
	168
	169	for (y=0;y<lines;y++)
	170	{
	171	Pico.m.scanline=(short)y;
	172
	173	// pad delay (for 6 button pads)
	174	if(PicoOpt&0x20) {
	175	if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
	176	if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
	177	}
	178
bf098bc5	179	check_cd_dma();
bf098bc5	180
cc68a136	181	// H-Interrupts:
	182	if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
	183	{
	184	//dprintf("rhint:old @ %06x", SekPc);
	185	hint=pv->reg[10]; // Reload H-Int counter
	186	pv->pending_ints\|=0x10;
	187	if (pv->reg[0]&0x10) SekInterrupt(4);
	188	//dprintf("rhint: %i @ %06x [%i\|%i]", hint, SekPc, y, SekCycleCnt);
	189	//dprintf("hint_routine: %x", ((unsigned short)(Pico.ram+0x0B84)<<16)\|(unsigned short)(Pico.ram+0x0B86));
	190	}
	191
	192	// V-Interrupt:
	193	if (y == lines_vis)
	194	{
	195	//dprintf("vint: @ %06x [%i\|%i]", SekPc, y, SekCycleCnt);
	196	pv->status\|=0x88; // V-Int happened, go into vblank
	197	SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
	198	/*if(Pico.m.z80Run && (PicoOpt&4)) {
	199	z80CycleAim+=cycles_z80/2;
	200	total_z80+=z80_run(z80CycleAim-total_z80);
	201	z80CycleAim-=cycles_z80/2;
	202	}*/
	203	pv->pending_ints\|=0x20;
	204	if(pv->reg[1]&0x20) SekInterrupt(6);
	205	if(Pico.m.z80Run && (PicoOpt&4)) // ?
	206	z80_int();
	207	//dprintf("zint: [%i\|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
	208	}
	209
	210	// decide if we draw this line
	211	#if CAN_HANDLE_240_LINES
	212	if(!skip && ((!(pv->reg[1]&8) && y<224) \|\| ((pv->reg[1]&8) && y<240)) )
	213	#else
	214	if(!skip && y<224)
	215	#endif
	216	PicoLine(y);
	217
	218	if(PicoOpt&1)
	219	sound_timers_and_dac(y);
	220
	221	// get samples from sound chips
7a93adeb	222	if (y == 224 && PsndOut) {
	223	int len = sound_render(0, PsndLen);
	224	if (PicoWriteSound) PicoWriteSound(len);
	225	// clear sound buffer
	226	sound_clear();
	227	}
cc68a136	228
	229	// Run scanline:
	230	//dprintf("m68k starting exec @ %06x", SekPc);
672ad671	231	if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
cc68a136	232	SekRun(cycles_68k);
c459aefd	233	if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
cc68a136	234	#if 0
	235	int i;
	236	FILE *f = fopen("prg_ram.bin", "wb");
	237	for (i = 0; i < 0x80000; i+=2)
	238	{
	239	int tmp = Pico_mcd->prg_ram[i];
	240	Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
	241	Pico_mcd->prg_ram[i+1] = tmp;
	242	}
	243	fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
	244	fclose(f);
	245	exit(1);
	246	#endif
	247	//dprintf("s68k starting exec @ %06x", SekPcS68k);
	248	SekRunS68k(cycles_s68k);
	249	}
	250
	251	if((PicoOpt&4) && Pico.m.z80Run) {
	252	Pico.m.z80Run\|=2;
	253	z80CycleAim+=cycles_z80;
	254	total_z80+=z80_run(z80CycleAim-total_z80);
	255	}
	256
4f265db7	257	update_chips();
cc68a136	258	}
	259
	260	// draw a frame just after vblank in alternative render mode
	261	if(!PicoSkipFrame && (PicoOpt&0x10))
	262	PicoFrameFull();
	263
	264	return 0;
	265	}
	266
	267
	268	int PicoFrameMCD(void)
	269	{
	270	if(!(PicoOpt&0x10))
	271	PicoFrameStart();
	272
	273	PicoFrameHintsMCD();
	274
	275	return 0;
	276	}
	277
	278