i830_driver.c

是由intel提供的针对intel显卡915以上系列的linux驱动

#endif
      for(i = 0; i < numColors; i++) {
	 index = indices[i];
	 r = colors[index].red;
	 g = colors[index].green;
	 b = colors[index].blue;
	 val = (r << 16) | (g << 8) | b;
	 OUTREG(palreg + index * 4, val);
#if 1
         /* Dual head 8bpp modes seem to squish the primary's cmap - reload */
         if (!I830IsPrimary(pScrn) && xf86IsEntityShared(pScrn->entityList[0]) &&
             pScrn->depth == 8) {
  	    if (palreg == PALETTE_A)
	       OUTREG(PALETTE_B + index * 4, val8[index]);
	    else
	       OUTREG(PALETTE_A + index * 4, val8[index]);
         }
#endif
      }
      break;
   }
}

static int
I830UseDDC(ScrnInfoPtr pScrn)
{
   xf86MonPtr DDC = (xf86MonPtr)(pScrn->monitor->DDC);
   struct detailed_monitor_section* detMon;
   struct monitor_ranges *mon_range = NULL;
   int i;

   if (!DDC) return 0;

   /* Now change the hsync/vrefresh values of the current monitor to
    * match those of DDC */
   for (i = 0; i < 4; i++) {
      detMon = &DDC->det_mon[i];
      if(detMon->type == DS_RANGES)
         mon_range = &detMon->section.ranges;
   }

   if (!mon_range || mon_range->min_h == 0 || mon_range->max_h == 0 ||
		     mon_range->min_v == 0 || mon_range->max_v == 0)
      return 0;	/* bad ddc */

   xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Using detected DDC timings\n");
   xf86DrvMsg(pScrn->scrnIndex, X_INFO, "\tHorizSync %d-%d\n", 
		mon_range->min_h, mon_range->max_h);
   xf86DrvMsg(pScrn->scrnIndex, X_INFO, "\tVertRefresh %d-%d\n", 
		mon_range->min_v, mon_range->max_v);
#define DDC_SYNC_TOLERANCE SYNC_TOLERANCE
   if (pScrn->monitor->nHsync > 0) {
      for (i = 0; i < pScrn->monitor->nHsync; i++) {
         if ((1.0 - DDC_SYNC_TOLERANCE) * mon_range->min_h >
				pScrn->monitor->hsync[i].lo ||
	     (1.0 + DDC_SYNC_TOLERANCE) * mon_range->max_h <
				pScrn->monitor->hsync[i].hi) {
	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			  "config file hsync range %g-%gkHz not within DDC "
			  "hsync range %d-%dkHz\n",
			  pScrn->monitor->hsync[i].lo, pScrn->monitor->hsync[i].hi,
			  mon_range->min_h, mon_range->max_h);
         }
         pScrn->monitor->hsync[i].lo = mon_range->min_h;
	 pScrn->monitor->hsync[i].hi = mon_range->max_h;
      }
   }

   if (pScrn->monitor->nVrefresh > 0) {
      for (i=0; i<pScrn->monitor->nVrefresh; i++) {
         if ((1.0 - DDC_SYNC_TOLERANCE) * mon_range->min_v >
				pScrn->monitor->vrefresh[i].lo ||
	     (1.0 + DDC_SYNC_TOLERANCE) * mon_range->max_v <
				pScrn->monitor->vrefresh[i].hi) {
   	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			  "config file vrefresh range %g-%gHz not within DDC "
			  "vrefresh range %d-%dHz\n",
			  pScrn->monitor->vrefresh[i].lo, pScrn->monitor->vrefresh[i].hi,
			  mon_range->min_v, mon_range->max_v);
         }
         pScrn->monitor->vrefresh[i].lo = mon_range->min_v;
         pScrn->monitor->vrefresh[i].hi = mon_range->max_v;
      }
   }

   return mon_range->max_clock;
}

static void
PreInitCleanup(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);

   if (I830IsPrimary(pScrn))
      pI830->entityPrivate->pScrn_1 = NULL;
   if (I830IsPrimary(pScrn) && pI830->LpRing) {
      xfree(pI830->LpRing);
      pI830->LpRing = NULL;
   }
   if (I830IsPrimary(pScrn) && pI830->CursorMem) {
      xfree(pI830->CursorMem);
      pI830->CursorMem = NULL;
   }
   if (I830IsPrimary(pScrn) && pI830->CursorMemARGB) {
      xfree(pI830->CursorMemARGB);
      pI830->CursorMemARGB = NULL;
   }
   if (I830IsPrimary(pScrn) && pI830->OverlayMem) {
      xfree(pI830->OverlayMem);
      pI830->OverlayMem = NULL;
   }
   if (I830IsPrimary(pScrn) && pI830->overlayOn) {
      xfree(pI830->overlayOn);
      pI830->overlayOn = NULL;
   }
   if (I830IsPrimary(pScrn) && pI830->used3D) {
      xfree(pI830->used3D);
      pI830->used3D = NULL;
   }
   if (!I830IsPrimary(pScrn) && pI830->entityPrivate)
      pI830->entityPrivate->pScrn_2 = NULL;
   RestoreBIOSMemSize(pScrn);
   if (pI830->swfSaved) {
      OUTREG(SWF0, pI830->saveSWF0);
      OUTREG(SWF4, pI830->saveSWF4);
   }
   if (pI830->MMIOBase)
      I830UnmapMMIO(pScrn);
   I830BIOSFreeRec(pScrn);
}

Bool
I830IsPrimary(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);

   if (xf86IsEntityShared(pScrn->entityList[0])) {
	if (pI830->init == 0) return TRUE;
	else return FALSE;
   }

   return TRUE;
}

static Bool
I830BIOSPreInit(ScrnInfoPtr pScrn, int flags)
{
   vgaHWPtr hwp;
   I830Ptr pI830;
   MessageType from;
   rgb defaultWeight = { 0, 0, 0 };
   EntityInfoPtr pEnt;
   I830EntPtr pI830Ent = NULL;					
   int mem, memsize;
   int flags24;
   int defmon = 0;
   int i, n;
   int DDCclock = 0;
   char *s;
   DisplayModePtr p, pMon;
   pointer pDDCModule = NULL, pVBEModule = NULL;
   Bool enable;
   const char *chipname;
   unsigned int ver;
   char v[5];

   if (pScrn->numEntities != 1)
      return FALSE;

   if (!xf86LoadSubModule(pScrn, "intel_acpi"))
      return FALSE;

   /* try to load the video kernel module now */
   xf86LoadKernelModule("video");

   if (xf86LoaderCheckSymbol("I830ACPIOpen")) {
      void (*acpiOpen)(void) = NULL;

      acpiOpen = LoaderSymbol("I830ACPIOpen");

      if (acpiOpen) {
         ErrorF("Opening ACPI\n");
         (*acpiOpen)();
      }
   }

   /* Load int10 module */
   if (!xf86LoadSubModule(pScrn, "int10"))
      return FALSE;
   xf86LoaderReqSymLists(I810int10Symbols, NULL);

   /* Load vbe module */
   if (!(pVBEModule = xf86LoadSubModule(pScrn, "vbe")))
      return FALSE;
   xf86LoaderReqSymLists(I810vbeSymbols, NULL);

   pEnt = xf86GetEntityInfo(pScrn->entityList[0]);

   if (flags & PROBE_DETECT) {
      I830BIOSProbeDDC(pScrn, pEnt->index);
      return TRUE;
   }

   /* The vgahw module should be loaded here when needed */
   if (!xf86LoadSubModule(pScrn, "vgahw"))
      return FALSE;
   xf86LoaderReqSymLists(I810vgahwSymbols, NULL);

   /* Allocate a vgaHWRec */
   if (!vgaHWGetHWRec(pScrn))
      return FALSE;

   /* Allocate driverPrivate */
   if (!I830BIOSGetRec(pScrn))
      return FALSE;

   pI830 = I830PTR(pScrn);
   pI830->SaveGeneration = -1;
   pI830->pEnt = pEnt;

   pI830->displayWidth = 640; /* default it */

   if (pI830->pEnt->location.type != BUS_PCI)
      return FALSE;

   pI830->PciInfo = xf86GetPciInfoForEntity(pI830->pEnt->index);
   pI830->PciTag = pciTag(pI830->PciInfo->bus, pI830->PciInfo->device,
			  pI830->PciInfo->func);

    /* Allocate an entity private if necessary */
    if (xf86IsEntityShared(pScrn->entityList[0])) {
	pI830Ent = xf86GetEntityPrivate(pScrn->entityList[0],
					I830EntityIndex)->ptr;
        pI830->entityPrivate = pI830Ent;
    } else 
        pI830->entityPrivate = NULL;

   if (xf86RegisterResources(pI830->pEnt->index, 0, ResNone)) {
      PreInitCleanup(pScrn);
      return FALSE;
   }

   pScrn->racMemFlags = RAC_FB | RAC_COLORMAP;
   pScrn->monitor = pScrn->confScreen->monitor;
   pScrn->progClock = TRUE;
   pScrn->rgbBits = 8;

   flags24 = Support32bppFb | PreferConvert24to32 | SupportConvert24to32;

   if (!xf86SetDepthBpp(pScrn, 0, 0, 0, flags24))
      return FALSE;

   switch (pScrn->depth) {
   case 8:
   case 15:
   case 16:
   case 24:
      break;
   default:
      xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		 "Given depth (%d) is not supported by I830 driver\n",
		 pScrn->depth);
      return FALSE;
   }
   xf86PrintDepthBpp(pScrn);

   if (!xf86SetWeight(pScrn, defaultWeight, defaultWeight))
      return FALSE;
   if (!xf86SetDefaultVisual(pScrn, -1))
      return FALSE;

   hwp = VGAHWPTR(pScrn);
   pI830->cpp = pScrn->bitsPerPixel / 8;

   pI830->preinit = TRUE;

   /* Process the options */
   xf86CollectOptions(pScrn, NULL);
   if (!(pI830->Options = xalloc(sizeof(I830BIOSOptions))))
      return FALSE;
   memcpy(pI830->Options, I830BIOSOptions, sizeof(I830BIOSOptions));
   xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, pI830->Options);

   /* We have to use PIO to probe, because we haven't mapped yet. */
   I830SetPIOAccess(pI830);

   /* Initialize VBE record */
   if ((pI830->pVbe = VBEInit(NULL, pI830->pEnt->index)) == NULL) {
      xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "VBE initialization failed.\n");
      return FALSE;
   }

   switch (pI830->PciInfo->chipType) {
   case PCI_CHIP_I830_M:
      chipname = "830M";
      break;
   case PCI_CHIP_845_G:
      chipname = "845G";
      break;
   case PCI_CHIP_I855_GM:
      /* Check capid register to find the chipset variant */
      pI830->variant = (pciReadLong(pI830->PciTag, I85X_CAPID)
				>> I85X_VARIANT_SHIFT) & I85X_VARIANT_MASK;
      switch (pI830->variant) {
      case I855_GM:
	 chipname = "855GM";
	 break;
      case I855_GME:
	 chipname = "855GME";
	 break;
      case I852_GM:
	 chipname = "852GM";
	 break;
      case I852_GME:
	 chipname = "852GME";
	 break;
      default:
	 xf86DrvMsg(pScrn->scrnIndex, X_INFO,
		    "Unknown 852GM/855GM variant: 0x%x)\n", pI830->variant);
	 chipname = "852GM/855GM (unknown variant)";
	 break;
      }
      break;
   case PCI_CHIP_I865_G:
      chipname = "865G";
      break;
   case PCI_CHIP_I915_G:
      chipname = "915G";
      break;
   case PCI_CHIP_E7221_G:
      chipname = "E7221 (i915)";
      break;
   case PCI_CHIP_I915_GM:
      chipname = "915GM";
      break;
   case PCI_CHIP_I945_G:
      chipname = "945G";
      break;
   case PCI_CHIP_I945_GM:
      chipname = "945GM";
      break;
   default:
      chipname = "unknown chipset";
      break;
   }
   xf86DrvMsg(pScrn->scrnIndex, X_INFO,
	      "Integrated Graphics Chipset: Intel(R) %s\n", chipname);

   pI830->vbeInfo = VBEGetVBEInfo(pI830->pVbe);

   /* Set the Chipset and ChipRev, allowing config file entries to override. */
   if (pI830->pEnt->device->chipset && *pI830->pEnt->device->chipset) {
      pScrn->chipset = pI830->pEnt->device->chipset;
      from = X_CONFIG;
   } else if (pI830->pEnt->device->chipID >= 0) {
      pScrn->chipset = (char *)xf86TokenToString(I830BIOSChipsets,
						 pI830->pEnt->device->chipID);
      from = X_CONFIG;
      xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "ChipID override: 0x%04X\n",
		 pI830->pEnt->device->chipID);
   } else {
      from = X_PROBED;
      pScrn->chipset = (char *)xf86TokenToString(I830BIOSChipsets,
						 pI830->PciInfo->chipType);
   }

   if (pI830->pEnt->device->chipRev >= 0) {
      xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "ChipRev override: %d\n",
		 pI830->pEnt->device->chipRev);
   }

   xf86DrvMsg(pScrn->scrnIndex, from, "Chipset: \"%s\"\n",
	      (pScrn->chipset != NULL) ? pScrn->chipset : "Unknown i8xx");

   if (pI830->pEnt->device->MemBase != 0) {
      pI830->LinearAddr = pI830->pEnt->device->MemBase;
      from = X_CONFIG;
   } else {
      if (IS_I9XX(pI830)) {
	 pI830->LinearAddr = pI830->PciInfo->memBase[2] & 0xFF000000;
	 from = X_PROBED;
      } else if (pI830->PciInfo->memBase[1] != 0) {
	 /* XXX Check mask. */
	 pI830->LinearAddr = pI830->PciInfo->memBase[0] & 0xFF000000;
	 from = X_PROBED;
      } else {
	 xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		    "No valid FB address in PCI config space\n");
	 PreInitCleanup(pScrn);
	 return FALSE;
      }
   }

   xf86DrvMsg(pScrn->scrnIndex, from, "Linear framebuffer at 0x%lX\n",
	      (unsigned long)pI830->LinearAddr);

   if (pI830->pEnt->device->IOBase != 0) {
      pI830->MMIOAddr = pI830->pEnt->device->IOBase;
      from = X_CONFIG;
   } else {
      if (IS_I9XX(pI830)) {
	 pI830->MMIOAddr = pI830->PciInfo->memBase[0] & 0xFFF80000;
	 from = X_PROBED;
      } else if (pI830->PciInfo->memBase[1]) {
	 pI830->MMIOAddr = pI830->PciInfo->memBase[1] & 0xFFF80000;
	 from = X_PROBED;
      } else {
	 xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		    "No valid MMIO address in PCI config space\n");
	 PreInitCleanup(pScrn);
	 return FALSE;
      }
   }

   xf86DrvMsg(pScrn->scrnIndex, from, "IO registers at addr 0x%lX\n",
	      (unsigned long)pI830->MMIOAddr);

   /* Some of the probing needs MMIO access, so map it here. */
   I830MapMMIO(pScrn);

#if 1
   pI830->saveSWF0 = INREG(SWF0);
   pI830->saveSWF4 = INREG(SWF4);
   pI830->swfSaved = TRUE;

   /* Set "extended desktop" */
   OUTREG(SWF0, pI830->saveSWF0 | (1 << 21));

   /* Set "driver loaded",  "OS unknown", "APM 1.2" */
   OUTREG(SWF4, (pI830->saveSWF4 & ~((3 << 19) | (7 << 16))) |
		(1 << 23) | (2 << 16));
#endif

   if (IS_I830(pI830) || IS_845G(pI830)) {
      PCITAG bridge;
      CARD16 gmch_ctrl;

      bridge = pciTag(0, 0, 0);		/* This is always the host bridge */
      gmch_ctrl = pciReadWord(bridge, I830_GMCH_CTRL);
      if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_128M) {
	 pI830->FbMapSize = 0x8000000;
      } else {
	 pI830->FbMapSize = 0x4000000; /* 64MB - has this been tested ?? */
      }
   } else {
      if (IS_I9XX(pI830)) {
	 if (pI830->PciInfo->memBase[2] & 0x08000000)
	    pI830->FbMapSize = 0x8000000;	/* 128MB aperture */
	 else
	    pI830->FbMapSize = 0x10000000;	/* 256MB aperture */

   	 if (pI830->PciInfo->chipType == PCI_CHIP_E7221_G)
	    pI830->FbMapSize = 0x8000000;	/* 128MB aperture */
      } else
	 /* 128MB aperture for later chips */
	 pI830->FbMapSize = 0x8000000;
   }


   if (xf86IsEntityShared(pScrn->entityList[0])) {
      if (xf86IsPrimInitDone(pScrn->entityList[0])) {
	 pI830->init = 1;

         if (!pI830Ent->pScrn_1) {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
 		 "Failed to setup second head due to primary head failure.\n");
	    return FALSE;
         }

      } else {
         xf86Set