handle 'bad' dma better

[picodrive.git] / pico / videoport.c

/*\r
 * PicoDrive\r
 * (c) Copyright Dave, 2004\r
 * (C) notaz, 2006-2009\r
 *\r
 * This work is licensed under the terms of MAME license.\r
 * See COPYING file in the top-level directory.\r
 */\r
\r
#include "pico_int.h"\r
#define NEED_DMA_SOURCE\r
#include "memory.h"\r
\r
extern const unsigned char  hcounts_32[];\r
extern const unsigned char  hcounts_40[];\r
\r
#ifndef UTYPES_DEFINED\r
typedef unsigned char  u8;\r
typedef unsigned short u16;\r
typedef unsigned int   u32;\r
#define UTYPES_DEFINED\r
#endif\r
\r
int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask) = NULL;\r
\r
static __inline void AutoIncrement(void)\r
{\r
  Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
}\r
\r
static NOINLINE void VideoWrite128(u32 a, u16 d)\r
{\r
  // nasty\r
  a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);\r
  ((u8 *)PicoMem.vram)[a] = d;\r
}\r
\r
static void VideoWrite(u16 d)\r
{\r
  unsigned int a = Pico.video.addr;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: if (a & 1)\r
              d = (u16)((d << 8) | (d >> 8));\r
            PicoMem.vram [(a >> 1) & 0x7fff] = d;\r
            if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)\r
              Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
            break;\r
    case 3: Pico.m.dirtyPal = 1;\r
            PicoMem.cram [(a >> 1) & 0x3f] = d; break;\r
    case 5: PicoMem.vsram[(a >> 1) & 0x3f] = d; break;\r
    case 0x81:\r
      a |= Pico.video.addr_u << 16;\r
      VideoWrite128(a, d);\r
      break;\r
    //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
  }\r
\r
  AutoIncrement();\r
}\r
\r
static unsigned int VideoRead(void)\r
{\r
  unsigned int a=0,d=0;\r
\r
  a=Pico.video.addr; a>>=1;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 0: d=PicoMem.vram [a & 0x7fff]; break;\r
    case 8: d=PicoMem.cram [a & 0x003f]; break;\r
    case 4: d=PicoMem.vsram[a & 0x003f]; break;\r
    default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
  }\r
\r
  AutoIncrement();\r
  return d;\r
}\r
\r
static int GetDmaLength(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  int len=0;\r
  // 16-bit words to transfer:\r
  len =pvid->reg[0x13];\r
  len|=pvid->reg[0x14]<<8;\r
  len = ((len - 1) & 0xffff) + 1;\r
  return len;\r
}\r
\r
static void DmaSlow(int len, unsigned int source)\r
{\r
  u32 inc = Pico.video.reg[0xf];\r
  u32 a = Pico.video.addr;\r
  u16 *r, *base = NULL;\r
  u32 mask = 0x1ffff;\r
\r
  elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %06x",\r
    Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
    SekCyclesDone(), SekPc);\r
\r
  Pico.m.dma_xfers = len;\r
  if (Pico.m.dma_xfers < len) // lame 16bit var\r
    Pico.m.dma_xfers = ~0;\r
  SekCyclesBurnRun(CheckDMA());\r
\r
  if ((source & 0xe00000) == 0xe00000) { // Ram\r
    base = (u16 *)PicoMem.ram;\r
    mask = 0xffff;\r
  }\r
  else if (PicoIn.AHW & PAHW_MCD)\r
  {\r
    u8 r3 = Pico_mcd->s68k_regs[3];\r
    elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);\r
    if (source < 0x20000) { // Bios area\r
      base = (u16 *)Pico_mcd->bios;\r
    } else if ((source & 0xfc0000) == 0x200000) { // Word Ram\r
      if (!(r3 & 4)) { // 2M mode\r
        base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));\r
      } else {\r
        if (source < 0x220000) { // 1M mode\r
          int bank = r3 & 1;\r
          base = (u16 *)(Pico_mcd->word_ram1M[bank]);\r
        } else {\r
          DmaSlowCell(source - 2, a, len, inc);\r
          return;\r
        }\r
      }\r
      source -= 2;\r
    } else if ((source & 0xfe0000) == 0x020000) { // Prg Ram\r
      base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];\r
      source -= 2; // XXX: test\r
    }\r
  }\r
  else\r
  {\r
    // if we have DmaHook, let it handle ROM because of possible DMA delay\r
    u32 source2;\r
    if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))\r
      source = source2;\r
    else // Rom\r
      base = m68k_dma_source(source);\r
  }\r
  if (!base) {\r
    elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
    return;\r
  }\r
\r
  // operate in words\r
  source >>= 1;\r
  mask >>= 1;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: // vram\r
      r = PicoMem.vram;\r
      if (inc == 2 && !(a & 1) && a + len * 2 < 0x10000\r
          && !(((source + len - 1) ^ source) & ~mask))\r
      {\r
        // most used DMA mode\r
        memcpy((char *)r + a, base + (source & mask), len * 2);\r
        a += len * 2;\r
      }\r
      else\r
      {\r
        for(; len; len--)\r
        {\r
          u16 d = base[source++ & mask];\r
          if(a & 1) d=(d<<8)|(d>>8);\r
          r[a >> 1] = d;\r
          // AutoIncrement\r
          a = (u16)(a + inc);\r
        }\r
      }\r
      Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
      break;\r
\r
    case 3: // cram\r
      Pico.m.dirtyPal = 1;\r
      r = PicoMem.cram;\r
      for (; len; len--)\r
      {\r
        r[(a / 2) & 0x3f] = base[source++ & mask];\r
        // AutoIncrement\r
        a += inc;\r
      }\r
      break;\r
\r
    case 5: // vsram\r
      r = PicoMem.vsram;\r
      for (; len; len--)\r
      {\r
        r[(a / 2) & 0x3f] = base[source++ & mask];\r
        // AutoIncrement\r
        a += inc;\r
      }\r
      break;\r
\r
    case 0x81: // vram 128k\r
      a |= Pico.video.addr_u << 16;\r
      for(; len; len--)\r
      {\r
        VideoWrite128(a, base[source++ & mask]);\r
        // AutoIncrement\r
        a = (a + inc) & 0x1ffff;\r
      }\r
      Pico.video.addr_u = a >> 16;\r
      break;\r
\r
    default:\r
      if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))\r
        elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
      break;\r
  }\r
  // remember addr\r
  Pico.video.addr=(u16)a;\r
}\r
\r
static void DmaCopy(int len)\r
{\r
  u16 a = Pico.video.addr;\r
  u8 *vr = (u8 *)PicoMem.vram;\r
  u8 inc = Pico.video.reg[0xf];\r
  int source;\r
  elprintf(EL_VDPDMA, "DmaCopy len %i [%u]", len, SekCyclesDone());\r
\r
  Pico.m.dma_xfers = len;\r
  if (Pico.m.dma_xfers < len)\r
    Pico.m.dma_xfers = ~0;\r
  Pico.video.status |= SR_DMA;\r
\r
  source =Pico.video.reg[0x15];\r
  source|=Pico.video.reg[0x16]<<8;\r
\r
  for (; len; len--)\r
  {\r
    vr[a] = vr[source++ & 0xffff];\r
    // AutoIncrement\r
    a=(u16)(a+inc);\r
  }\r
  // remember addr\r
  Pico.video.addr=a;\r
  Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
static NOINLINE void DmaFill(int data)\r
{\r
  u16 a = Pico.video.addr;\r
  u8 *vr = (u8 *)PicoMem.vram;\r
  u8 high = (u8)(data >> 8);\r
  u8 inc = Pico.video.reg[0xf];\r
  int source;\r
  int len, l;\r
\r
  len = GetDmaLength();\r
  elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%u]", len, inc, SekCyclesDone());\r
\r
  Pico.m.dma_xfers = len;\r
  if (Pico.m.dma_xfers < len) // lame 16bit var\r
    Pico.m.dma_xfers = ~0;\r
  Pico.video.status |= SR_DMA;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: // vram\r
      for (l = len; l; l--) {\r
        // Write upper byte to adjacent address\r
        // (here we are byteswapped, so address is already 'adjacent')\r
        vr[a] = high;\r
\r
        // Increment address register\r
        a = (u16)(a + inc);\r
      }\r
      break;\r
    case 3:   // cram\r
    case 5: { // vsram\r
      // TODO: needs fifo; anyone using these?\r
      static int once;\r
      if (!once++)\r
        elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");\r
    }\r
    default:\r
      a += len * inc;\r
      break;\r
  }\r
\r
  // remember addr\r
  Pico.video.addr = a;\r
  // register update\r
  Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;\r
  source  = Pico.video.reg[0x15];\r
  source |= Pico.video.reg[0x16] << 8;\r
  source += len;\r
  Pico.video.reg[0x15] = source;\r
  Pico.video.reg[0x16] = source >> 8;\r
\r
  Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
static NOINLINE void CommandDma(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  u32 len, method;\r
  u32 source;\r
\r
  if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
\r
  if (Pico.m.dma_xfers)\r
    elprintf(EL_VDPDMA|EL_ANOMALY, "Dma overlap, left=%d @ %06x",\r
             Pico.m.dma_xfers, SekPc);\r
\r
  len = GetDmaLength();\r
  source =Pico.video.reg[0x15];\r
  source|=Pico.video.reg[0x16] << 8;\r
  source|=Pico.video.reg[0x17] << 16;\r
\r
  method=pvid->reg[0x17]>>6;\r
  if (method < 2)\r
    DmaSlow(len, source << 1); // 68000 to VDP\r
  else if (method == 3)\r
    DmaCopy(len); // VRAM Copy\r
  else\r
    return;\r
\r
  source += len;\r
  Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;\r
  Pico.video.reg[0x15] = source;\r
  Pico.video.reg[0x16] = source >> 8;\r
}\r
\r
static NOINLINE void CommandChange(void)\r
{\r
  struct PicoVideo *pvid = &Pico.video;\r
  unsigned int cmd, addr;\r
\r
  cmd = pvid->command;\r
\r
  // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
  pvid->type = (u8)(((cmd >> 2) & 0xc) | (cmd >> 30));\r
  if (pvid->type == 1) // vram\r
    pvid->type |= pvid->reg[1] & 0x80; // 128k\r
\r
  // Get address 0x3fff0003\r
  addr  = (cmd >> 16) & 0x3fff;\r
  addr |= (cmd << 14) & 0xc000;\r
  pvid->addr = (u16)addr;\r
  pvid->addr_u = (u8)((cmd >> 2) & 1);\r
}\r
\r
static void DrawSync(int blank_on)\r
{\r
  if (Pico.m.scanline < 224 && !(PicoIn.opt & POPT_ALT_RENDERER) &&\r
      !PicoIn.skipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {\r
    //elprintf(EL_ANOMALY, "sync");\r
    PicoDrawSync(Pico.m.scanline, blank_on);\r
  }\r
}\r
\r
PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
\r
  //elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x [%u] @ %06x",\r
  //  a, d, SekCyclesDone(), SekPc);\r
\r
  a &= 0x1c;\r
  switch (a)\r
  {\r
  case 0x00: // Data port 0 or 2\r
    // try avoiding the sync..\r
    if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&\r
        !(!pvid->pending &&\r
          ((pvid->command & 0xc00000f0) == 0x40000010 && PicoMem.vsram[pvid->addr>>1] == d))\r
       )\r
      DrawSync(0);\r
\r
    if (pvid->pending) {\r
      CommandChange();\r
      pvid->pending=0;\r
    }\r
\r
    if (!(pvid->status & SR_VB) && !(PicoIn.opt&POPT_DIS_VDP_FIFO))\r
    {\r
      int use = pvid->type == 1 ? 2 : 1;\r
      pvid->lwrite_cnt -= use;\r
      if (pvid->lwrite_cnt < 0)\r
        SekCyclesLeft = 0;\r
      elprintf(EL_ASVDP, "VDP data write: [%04x] %04x [%u] {%i} #%i @ %06x",\r
        Pico.video.addr, d, SekCyclesDone(), Pico.video.type, pvid->lwrite_cnt, SekPc);\r
    }\r
    VideoWrite(d);\r
\r
    if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
      DmaFill(d);\r
\r
    break;\r
\r
  case 0x04: // Control (command) port 4 or 6\r
    if (pvid->pending)\r
    {\r
      // Low word of command:\r
      pvid->command &= 0xffff0000;\r
      pvid->command |= d;\r
      pvid->pending = 0;\r
      CommandChange();\r
      // Check for dma:\r
      if (d & 0x80) {\r
        DrawSync(0);\r
        CommandDma();\r
      }\r
    }\r
    else\r
    {\r
      if ((d&0xc000)==0x8000)\r
      {\r
        // Register write:\r
        int num=(d>>8)&0x1f;\r
        int dold=pvid->reg[num];\r
        int blank_on = 0;\r
        pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
        if (num > 0x0a && !(pvid->reg[1]&4)) {\r
          elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
          return;\r
        }\r
\r
        if (num == 1 && !(d&0x40) && SekCyclesDone() - Pico.t.m68c_line_start <= 488-390)\r
          blank_on = 1;\r
        DrawSync(blank_on);\r
        pvid->reg[num]=(unsigned char)d;\r
        switch (num)\r
        {\r
          case 0x00:\r
            elprintf(EL_INTSW, "hint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x10)>>4,\r
                    (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
            goto update_irq;\r
          case 0x01:\r
            elprintf(EL_INTSW, "vint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x20)>>5,\r
                    (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
            if (!(pvid->status & PVS_VB2))\r
              pvid->status &= ~SR_VB;\r
            pvid->status |= ((d >> 3) ^ SR_VB) & SR_VB; // forced blanking\r
            goto update_irq;\r
          case 0x05:\r
            //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);\r
            if (d^dold) Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;\r
            break;\r
          case 0x0c:\r
            // renderers should update their palettes if sh/hi mode is changed\r
            if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
            break;\r
        }\r
        return;\r
\r
update_irq:\r
#ifndef EMU_CORE_DEBUG\r
        // update IRQ level\r
        if (!SekShouldInterrupt()) // hack\r
        {\r
          int lines, pints, irq = 0;\r
          lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
          pints = pvid->pending_ints & lines;\r
               if (pints & 0x20) irq = 6;\r
          else if (pints & 0x10) irq = 4;\r
          SekInterrupt(irq); // update line\r
\r
          // this is broken because cost of current insn isn't known here\r
          if (irq) SekEndRun(21); // make it delayed\r
        }\r
#endif\r
      }\r
      else\r
      {\r
        // High word of command:\r
        pvid->command&=0x0000ffff;\r
        pvid->command|=d<<16;\r
        pvid->pending=1;\r
      }\r
    }\r
    break;\r
\r
  // case 0x08: // 08 0a - HV counter - lock up\r
  // case 0x0c: // 0c 0e - HV counter - lock up\r
  // case 0x10: // 10 12 - PSG - handled by caller\r
  // case 0x14: // 14 16 - PSG - handled by caller\r
  // case 0x18: // 18 1a - no effect?\r
  case 0x1c: // 1c 1e - debug\r
    pvid->debug = d;\r
    pvid->debug_p = 0;\r
    if (d & (1 << 6)) {\r
      pvid->debug_p |= PVD_KILL_A | PVD_KILL_B;\r
      pvid->debug_p |= PVD_KILL_S_LO | PVD_KILL_S_HI;\r
    }\r
    switch ((d >> 7) & 3) {\r
      case 1:\r
        pvid->debug_p &= ~(PVD_KILL_S_LO | PVD_KILL_S_HI);\r
        pvid->debug_p |= PVD_FORCE_S;\r
        break;\r
      case 2:\r
        pvid->debug_p &= ~PVD_KILL_A;\r
        pvid->debug_p |= PVD_FORCE_A;\r
        break;\r
      case 3:\r
        pvid->debug_p &= ~PVD_KILL_B;\r
        pvid->debug_p |= PVD_FORCE_B;\r
        break;\r
    }\r
    break;\r
  }\r
}\r
\r
static u32 SrLow(const struct PicoVideo *pv)\r
{\r
  unsigned int c, d = pv->status;\r
\r
  c = SekCyclesDone() - Pico.t.m68c_line_start - 39;\r
  if (c < 92)\r
    d |= SR_HB;\r
  return d;\r
}\r
\r
PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
{\r
  a &= 0x1c;\r
\r
  if (a == 0x04) // control port\r
  {\r
    struct PicoVideo *pv = &Pico.video;\r
    unsigned int d = SrLow(pv);\r
    pv->pending = 0;\r
    elprintf(EL_SR, "SR read: %04x [%u] @ %06x", d, SekCyclesDone(), SekPc);\r
    return d;\r
  }\r
\r
  // H-counter info (based on Generator):\r
  // frame:\r
  //                       |       <- hblank? ->      |\r
  // start    <416>       hint  <36> hdisplay <38>  end // CPU cycles\r
  // |---------...---------|------------|-------------|\r
  // 0                   B6 E4                       FF // 40 cells\r
  // 0                   93 E8                       FF // 32 cells\r
\r
  // Gens (?)              v-render\r
  // start  <hblank=84>   hint    hdisplay <404>      |\r
  // |---------------------|--------------------------|\r
  // E4  (hc[0x43]==0)    07                         B1 // 40\r
  // E8  (hc[0x45]==0)    05                         91 // 32\r
\r
  // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
  if ((a&0x1c)==0x08)\r
  {\r
    unsigned int d;\r
\r
    d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME\r
    if (Pico.video.reg[12]&1)\r
         d = hcounts_40[d];\r
    else d = hcounts_32[d];\r
\r
    elprintf(EL_HVCNT, "hv: %02x %02x [%u] @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);\r
    return d | (Pico.video.v_counter << 8);\r
  }\r
\r
  if (a==0x00) // data port\r
  {\r
    return VideoRead();\r
  }\r
\r
  return 0;\r
}\r
\r
unsigned char PicoVideoRead8DataH(void)\r
{\r
  return VideoRead() >> 8;\r
}\r
\r
unsigned char PicoVideoRead8DataL(void)\r
{\r
  return VideoRead();\r
}\r
\r
unsigned char PicoVideoRead8CtlH(void)\r
{\r
  u8 d = (u8)(Pico.video.status >> 8);\r
  Pico.video.pending = 0;\r
  elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);\r
  return d;\r
}\r
\r
unsigned char PicoVideoRead8CtlL(void)\r
{\r
  u8 d = SrLow(&Pico.video);\r
  Pico.video.pending = 0;\r
  elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);\r
  return d;\r
}\r
\r
unsigned char PicoVideoRead8HV_H(void)\r
{\r
  elprintf(EL_HVCNT, "vcounter: %02x [%u] @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);\r
  return Pico.video.v_counter;\r
}\r
\r
// FIXME: broken\r
unsigned char PicoVideoRead8HV_L(void)\r
{\r
  u32 d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME\r
  if (Pico.video.reg[12]&1)\r
       d = hcounts_40[d];\r
  else d = hcounts_32[d];\r
  elprintf(EL_HVCNT, "hcounter: %02x [%u] @ %06x", d, SekCyclesDone(), SekPc);\r
  return d;\r
}\r
\r
// vim:shiftwidth=2:ts=2:expandtab\r