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psxdma.c

/***************************************************************************
 *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
 *   schultz.ryan@gmail.com, http://rschultz.ath.cx/code.php               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/*
* Handles PSX DMA functions.
*/

#include "psxdma.h"

// Dma0/1 in Mdec.c
// Dma3   in CdRom.c

void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
      u16 *ptr;
      u32 size;

      switch (chcr) {
            case 0x01000201: //cpu to spu transfer
#ifdef PSXDMA_LOG
                  PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif
                  ptr = (u16 *)PSXM(madr);
                  if (ptr == NULL) {
#ifdef CPU_LOG
                        CPU_LOG("*** DMA4 SPU - mem2spu *** NULL Pointer!!!\n");
#endif
                        break;
                  }
                  SPU_writeDMAMem(ptr, (bcr >> 16) * (bcr & 0xffff) * 2);
                  break;

            case 0x01000200: //spu to cpu transfer
#ifdef PSXDMA_LOG
                  PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif
                  ptr = (u16 *)PSXM(madr);
                  if (ptr == NULL) {
#ifdef CPU_LOG
                        CPU_LOG("*** DMA4 SPU - spu2mem *** NULL Pointer!!!\n");
#endif
                        break;
                  }
                  size = (bcr >> 16) * (bcr & 0xffff) * 2;
            SPU_readDMAMem(ptr, size);
                  psxCpu->Clear(madr, size);
                  break;

#ifdef PSXDMA_LOG
            default:
                  PSXDMA_LOG("*** DMA4 SPU - unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
                  break;
#endif
      }

      HW_DMA4_CHCR &= SWAP32(~0x01000000);
      DMA_INTERRUPT(4);
}

void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
      u32 *ptr;
      u32 size;

      switch(chcr) {
            case 0x01000200: // vram2mem
#ifdef PSXDMA_LOG
                  PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif
                  ptr = (u32 *)PSXM(madr);
                  if (ptr == NULL) {
#ifdef CPU_LOG
                        CPU_LOG("*** DMA2 GPU - vram2mem *** NULL Pointer!!!\n");
#endif
                        break;
                  }
                  size = (bcr >> 16) * (bcr & 0xffff);
                  GPU_readDataMem(ptr, size);
                  psxCpu->Clear(madr, size);
                  break;

            case 0x01000201: // mem2vram
#ifdef PSXDMA_LOG
                  PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif
                  ptr = (u32 *)PSXM(madr);
                  if (ptr == NULL) {
#ifdef CPU_LOG
                        CPU_LOG("*** DMA2 GPU - mem2vram *** NULL Pointer!!!\n");
#endif
                        break;
                  }
                  size = (bcr >> 16) * (bcr & 0xffff);
                  GPU_writeDataMem(ptr, size);
                  GPUDMA_INT((size / 4) / BIAS);
                  return;
//                break;

            case 0x01000401: // dma chain
#ifdef PSXDMA_LOG
                  PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif
                  GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
                  break;

#ifdef PSXDMA_LOG
            default:
                  PSXDMA_LOG("*** DMA 2 - GPU unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
                  break;
#endif
      }

      HW_DMA2_CHCR &= SWAP32(~0x01000000);
      DMA_INTERRUPT(2);
}

void gpuInterrupt() {
      HW_DMA2_CHCR &= SWAP32(~0x01000000);
      DMA_INTERRUPT(2);
}

void psxDma6(u32 madr, u32 bcr, u32 chcr) {
      u32 *mem = (u32 *)PSXM(madr);

#ifdef PSXDMA_LOG
      PSXDMA_LOG("*** DMA6 OT *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif

      if (chcr == 0x11000002) {
            if (mem == NULL) {
#ifdef CPU_LOG
                  CPU_LOG("*** DMA6 OT *** NULL Pointer!!!\n");
#endif
                  HW_DMA6_CHCR &= SWAP32(~0x01000000);
                  DMA_INTERRUPT(6);
                  return;
            }

            while (bcr--) {
                  *mem-- = SWAP32((madr - 4) & 0xffffff);
                  madr -= 4;
            }
            mem++; *mem = 0xffffff;
      }
#ifdef PSXDMA_LOG
      else {
            // Unknown option
            PSXDMA_LOG("*** DMA6 OT - unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
      }
#endif

      HW_DMA6_CHCR &= SWAP32(~0x01000000);
      DMA_INTERRUPT(6);
}


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