src/add-ons/accelerants/3dfx/3dfx_init.cpp

   1 /*
   2  * Copyright 2010 Haiku, Inc.  All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  *
   5  * Authors:
   6  *              Gerald Zajac
   7  */
   8
   9 #include "accelerant.h"
  10 #include "3dfx.h"
  11
  12
  13
  14 uint32
  15 TDFX_GetVideoMemorySize(void)
  16 {
  17         // Return the number of bytes of video memory.
  18
  19         uint32  chipSize;               // size is in megabytes
  20         uint32  dramInit0 = INREG32(DRAM_INIT0);
  21         uint32  dramInit1 = INREG32(DRAM_INIT1);
  22         uint32  numChips = (dramInit0 & SGRAM_NUM_CHIPSETS) ? 8 : 4;
  23         int             memType = (dramInit1 & MCTL_TYPE_SDRAM) ? MEM_TYPE_SDRAM : MEM_TYPE_SGRAM;
  24
  25         if (gInfo.sharedInfo->chipType == VOODOO_5) {
  26                 chipSize = 1 << ((dramInit0 >> 27) & 0x7);
  27         } else {
  28                 // Banshee or Voodoo3
  29                 if (memType == MEM_TYPE_SDRAM)
  30                         chipSize = 2;
  31                 else
  32                         chipSize = (dramInit0 & SGRAM_TYPE) ? 2 : 1;
  33         }
  34
  35         // Disable block writes for SDRAM.
  36
  37         uint32 miscInit1 = INREG32(MISC_INIT1);
  38         if (memType == MEM_TYPE_SDRAM) {
  39                 miscInit1 |= DISABLE_2D_BLOCK_WRITE;
  40         }
  41         miscInit1 |= 1;
  42         OUTREG32(MISC_INIT1, miscInit1);
  43
  44         return chipSize * numChips * 1024 * 1024;
  45 }
  46
  47
  48 status_t
  49 TDFX_Init(void)
  50 {
  51         TRACE("TDFX_Init()\n");
  52
  53         SharedInfo& si = *gInfo.sharedInfo;
  54
  55         si.videoMemSize = TDFX_GetVideoMemorySize();
  56
  57         si.cursorOffset = 0;
  58         si.frameBufferOffset = si.cursorOffset + CURSOR_BYTES;
  59         si.maxFrameBufferSize = si.videoMemSize - si.frameBufferOffset;
  60
  61         TRACE("Video Memory size: %d MB\n", si.videoMemSize / 1024 / 1024);
  62         TRACE("frameBufferOffset: 0x%x  cursorOffset: 0x%x\n",
  63                 si.frameBufferOffset, si.cursorOffset);
  64
  65         switch (si.chipType) {
  66                 case BANSHEE:
  67                         si.maxPixelClock = 270000;
  68                         break;
  69                 case VOODOO_3:
  70                         si.maxPixelClock = 300000;
  71                         break;
  72                 case VOODOO_5:
  73                         si.maxPixelClock = 350000;
  74                         break;
  75                 default:
  76                         TRACE("Undefined chip type: %d\n", si.chipType);
  77                         return B_ERROR;
  78         }
  79
  80         // Set up the array of color spaces supported by the 3dfx chips.
  81
  82         si.colorSpaces[0] = B_CMAP8;
  83         si.colorSpaces[1] = B_RGB16;
  84         si.colorSpaces[2] = B_RGB32;
  85         si.colorSpaceCount = 3;
  86
  87         // Setup the mode list.
  88
  89         return CreateModeList(IsModeUsable);
  90 }