i830_driver.c

是由intel提供的针对intel显卡915以上系列的linux驱动

         pipe = 0;
#if 0
         ErrorF("PIPE %d\n",pipe);
#endif
      }

      switch ((VODA & 0x00000F00) >> 8) {
      case 0x0:
      case 0x1: /* CRT */
         devices |= PIPE_CRT << (pipe == 1 ? 8 : 0);
         break;
      case 0x2: /* TV/HDTV */
         devices |= PIPE_TV << (pipe == 1 ? 8 : 0);
         break;
      case 0x3: /* DFP */
         devices |= PIPE_DFP << (pipe == 1 ? 8 : 0);
         break;
      case 0x4: /* LFP */
         devices |= PIPE_LFP << (pipe == 1 ? 8 : 0);
         break;
      }
   }

   xf86DrvMsg(pScrn->scrnIndex, X_INFO, "ACPI Toggle devices 0x%x\n", devices);

   return devices;
}

static int
GetAttachableDisplayDeviceList(ScrnInfoPtr pScrn)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;
   int i;

   DPRINTF(PFX, "GetAttachableDisplayDeviceList\n");

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f64;
   pVbe->pInt10->bx = 0x900;
   pVbe->pInt10->es = SEG_ADDR(pVbe->real_mode_base);
   pVbe->pInt10->di = SEG_OFF(pVbe->real_mode_base);

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (!Check5fStatus(pScrn, 0x5f64, pVbe->pInt10->ax))
      return 0;

   for (i=0; i<(pVbe->pInt10->cx & 0xff); i++)
        xf86DrvMsg(pScrn->scrnIndex, X_INFO, 
		"Attachable device 0x%lx.\n", ((CARD32*)pVbe->memory)[i]);

   return pVbe->pInt10->cx & 0xffff;
}

static int
BitToRefresh(int bits)
{
   int i;

   for (i = 0; i < nrefreshes; i++)
      if (bits & (1 << i))
	 return i830refreshes[i];
   return 0;
}

static int
GetRefreshRate(ScrnInfoPtr pScrn, int mode, int *availRefresh)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;

   DPRINTF(PFX, "GetRefreshRate\n");

   /* Only 8-bit mode numbers are supported. */
   if (mode & 0x100)
      return 0;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f05;
   pVbe->pInt10->bx = (mode & 0xff) | 0x100;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f05, pVbe->pInt10->ax)) {
      if (availRefresh)
         *availRefresh = pVbe->pInt10->bx;
      return BitToRefresh(pVbe->pInt10->cx);
   } else
      return 0;
}

struct panelid {
	short hsize;
	short vsize;
	short fptype;
	char redbpp;
	char greenbpp;
	char bluebpp;
	char reservedbpp;
	int rsvdoffscrnmemsize;
	int rsvdoffscrnmemptr;
	char reserved[14];
};

static void
I830InterpretPanelID(int scrnIndex, unsigned char *tmp)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    struct panelid *block = (struct panelid *)tmp;

#define PANEL_DEFAULT_HZ 60

   xf86DrvMsg(pScrn->scrnIndex, X_INFO,
	 "PanelID returned panel resolution : %dx%d\n", 
						block->hsize, block->vsize);

   /* If we get bogus values from this, don't accept it */
   if (block->hsize == 0 || block->vsize == 0) {
   	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
	 "Bad Panel resolution - ignoring panelID\n");
	
	return;
   }

   /* If we have monitor timings then don't overwrite them */
   if (pScrn->monitor->nHsync > 0 &&
	pScrn->monitor->nVrefresh > 0)
	return;

   /* With panels, we're always assuming a refresh of 60Hz */

   pScrn->monitor->nHsync = 1;
   pScrn->monitor->nVrefresh = 1;

   /* Give a little tolerance for the selected panel */
   pScrn->monitor->hsync[0].lo = (float)((PANEL_DEFAULT_HZ/1.05)*block->vsize)/1000;
   pScrn->monitor->hsync[0].hi = (float)((PANEL_DEFAULT_HZ/0.95)*block->vsize)/1000;
   pScrn->monitor->vrefresh[0].lo = (float)PANEL_DEFAULT_HZ;
   pScrn->monitor->vrefresh[0].hi = (float)PANEL_DEFAULT_HZ;
}

/* This should probably go into the VBE layer */
static unsigned char *
vbeReadPanelID(vbeInfoPtr pVbe)
{
    int RealOff = pVbe->real_mode_base;
    pointer page = pVbe->memory;
    unsigned char *tmp = NULL;
    int screen = pVbe->pInt10->scrnIndex;

    pVbe->pInt10->ax = 0x4F11;
    pVbe->pInt10->bx = 0x01;
    pVbe->pInt10->cx = 0;
    pVbe->pInt10->dx = 0;
    pVbe->pInt10->es = SEG_ADDR(RealOff);
    pVbe->pInt10->di = SEG_OFF(RealOff);
    pVbe->pInt10->num = 0x10;

    xf86ExecX86int10(pVbe->pInt10);

    if ((pVbe->pInt10->ax & 0xff) != 0x4f) {
        xf86DrvMsgVerb(screen,X_INFO,3,"VESA VBE PanelID invalid\n");
	goto error;
    }
    switch (pVbe->pInt10->ax & 0xff00) {
    case 0x0:
	xf86DrvMsgVerb(screen,X_INFO,3,"VESA VBE PanelID read successfully\n");
  	tmp = (unsigned char *)xnfalloc(32); 
  	memcpy(tmp,page,32); 
	break;
    case 0x100:
	xf86DrvMsgVerb(screen,X_INFO,3,"VESA VBE PanelID read failed\n");	
	break;
    default:
	xf86DrvMsgVerb(screen,X_INFO,3,"VESA VBE PanelID unknown failure %i\n",
		       pVbe->pInt10->ax & 0xff00);
	break;
    }

 error:
    return tmp;
}

static void
vbeDoPanelID(vbeInfoPtr pVbe)
{
    unsigned char *PanelID_data;
    
    if (!pVbe) return;

    PanelID_data = vbeReadPanelID(pVbe);

    if (!PanelID_data) 
	return;
    
    I830InterpretPanelID(pVbe->pInt10->scrnIndex, PanelID_data);
}

int 
I830GetBestRefresh(ScrnInfoPtr pScrn, int refresh)
{
   int i;

   for (i = nrefreshes - 1; i >= 0; i--) {
      /*
       * Look for the highest value that the requested (refresh + 2) is
       * greater than or equal to.
       */
      if (i830refreshes[i] <= (refresh + 2))
	 break;
   }
   /* i can be 0 if the requested refresh was higher than the max. */
   if (i == 0) {
      if (refresh >= i830refreshes[nrefreshes - 1])
         i = nrefreshes - 1;
   }

   return i;
}

static int
SetRefreshRate(ScrnInfoPtr pScrn, int mode, int refresh)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;
   int i = I830GetBestRefresh(pScrn, refresh);

   DPRINTF(PFX, "SetRefreshRate: mode 0x%x, refresh: %d\n", mode, refresh);

   DPRINTF(PFX, "Setting refresh rate to %dHz for mode 0x%02x\n",
	   i830refreshes[i], mode & 0xff);

   /* Only 8-bit mode numbers are supported. */
   if (mode & 0x100)
      return 0;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f05;
   pVbe->pInt10->bx = mode & 0xff;

   pVbe->pInt10->cx = 1 << i;
   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f05, pVbe->pInt10->ax))
      return i830refreshes[i];
   else
      return 0;
}

#if 0
static Bool
SetPowerStatus(ScrnInfoPtr pScrn, int mode)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f64;
   pVbe->pInt10->bx = 0x0800 | mode;
   pVbe->pInt10->cx = 0x0000;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f64, pVbe->pInt10->ax))
      return TRUE;
  
   return FALSE;
}
#endif

static Bool
GetModeSupport(ScrnInfoPtr pScrn, int modePipeA, int modePipeB,
	       int devicesPipeA, int devicesPipeB, int *maxBandwidth,
	       int *bandwidthPipeA, int *bandwidthPipeB)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;

   DPRINTF(PFX, "GetModeSupport: modes 0x%x, 0x%x, devices: 0x%x, 0x%x\n",
	   modePipeA, modePipeB, devicesPipeA, devicesPipeB);

   /* Only 8-bit mode numbers are supported. */
   if ((modePipeA & 0x100) || (modePipeB & 0x100))
      return FALSE;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f28;
   pVbe->pInt10->bx = (modePipeA & 0xff) | ((modePipeB & 0xff) << 8);
   if ((devicesPipeA & 0x80) || (devicesPipeB & 0x80))
      pVbe->pInt10->cx = 0x8000;
   else
      pVbe->pInt10->cx = (devicesPipeA & 0xff) | ((devicesPipeB & 0xff) << 8);

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f28, pVbe->pInt10->ax)) {
      if (maxBandwidth)
	 *maxBandwidth = pVbe->pInt10->cx;
      if (bandwidthPipeA)
	 *bandwidthPipeA = pVbe->pInt10->dx & 0xffff;
      /* XXX For XFree86 4.2.0 and earlier, ->dx is truncated to 16 bits. */
      if (bandwidthPipeB)
	 *bandwidthPipeB = (pVbe->pInt10->dx >> 16) & 0xffff;
      return TRUE;
   } else
      return FALSE;
}

#if 0
static int
GetLFPCompMode(ScrnInfoPtr pScrn)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;

   DPRINTF(PFX, "GetLFPCompMode\n");

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f61;
   pVbe->pInt10->bx = 0x100;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f61, pVbe->pInt10->ax))
      return pVbe->pInt10->cx & 0xffff;
   else
      return -1;
}

static Bool
SetLFPCompMode(ScrnInfoPtr pScrn, int compMode)
{
   vbeInfoPtr pVbe = I830PTR(pScrn)->pVbe;

   DPRINTF(PFX, "SetLFPCompMode: compMode %d\n", compMode);

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f61;
   pVbe->pInt10->bx = 0;
   pVbe->pInt10->cx = compMode;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   return Check5fStatus(pScrn, 0x5f61, pVbe->pInt10->ax);
}
#endif

static int
GetDisplayDevices(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);
   vbeInfoPtr pVbe = pI830->pVbe;

   DPRINTF(PFX, "GetDisplayDevices\n");

#if 0
   {
      CARD32 temp;
      ErrorF("ADPA is 0x%08x\n", INREG(ADPA));
      ErrorF("DVOA is 0x%08x\n", INREG(DVOA));
      ErrorF("DVOB is 0x%08x\n", INREG(DVOB));
      ErrorF("DVOC is 0x%08x\n", INREG(DVOC));
      ErrorF("LVDS is 0x%08x\n", INREG(LVDS));
      temp = INREG(DVOA_SRCDIM);
      ErrorF("DVOA_SRCDIM is 0x%08x (%d x %d)\n", temp,
	     (temp >> 12) & 0xfff, temp & 0xfff);
      temp = INREG(DVOB_SRCDIM);
      ErrorF("DVOB_SRCDIM is 0x%08x (%d x %d)\n", temp,
	     (temp >> 12) & 0xfff, temp & 0xfff);
      temp = INREG(DVOC_SRCDIM);
      ErrorF("DVOC_SRCDIM is 0x%08x (%d x %d)\n", temp,
	     (temp >> 12) & 0xfff, temp & 0xfff);
      ErrorF("SWF0 is 0x%08x\n", INREG(SWF0));
      ErrorF("SWF4 is 0x%08x\n", INREG(SWF4));
   }
#endif

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f64;
   pVbe->pInt10->bx = 0x100;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f64, pVbe->pInt10->ax)) {
      return pVbe->pInt10->cx & 0xffff;
   } else {
      if (pI830->PciInfo->chipType == PCI_CHIP_E7221_G) /* FIXED CONFIG */
         return PIPE_CRT;
      else
         return -1;
   }
}

static int
GetBIOSPipe(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);
   vbeInfoPtr pVbe = pI830->pVbe;
   int pipe;

   DPRINTF(PFX, "GetBIOSPipe:\n");

   /* single pipe machines should always return Pipe A */
   if (pI830->availablePipes == 1) return 0;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f1c;
   pVbe->pInt10->bx = 0x100;

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f1c, pVbe->pInt10->ax)) {
      if (pI830->newPipeSwitch) {
         pipe = ((pVbe->pInt10->bx & 0x0001));
      } else {
         pipe = ((pVbe->pInt10->cx & 0x0100) >> 8);
      }
      return pipe;
   }

   /* failed, assume pipe A */
   return 0;
}

static Bool
SetBIOSPipe(ScrnInfoPtr pScrn, int pipe)
{
   I830Ptr pI830 = I830PTR(pScrn);
   vbeInfoPtr pVbe = pI830->pVbe;

   DPRINTF(PFX, "SetBIOSPipe: pipe 0x%x\n", pipe);

   /* single pipe machines should always return TRUE */
   if (pI830->availablePipes == 1) return TRUE;

   pVbe->pInt10->num = 0x10;
   pVbe->pInt10->ax = 0x5f1c;
   if (pI830->newPipeSwitch) {
      pVbe->pInt10->bx = pipe;
      pVbe->pInt10->cx = 0;
   } else {
      pVbe->pInt10->bx = 0x0;
      pVbe->pInt10->cx = pipe << 8;
   }

   xf86ExecX86int10_wrapper(pVbe->pInt10, pScrn);
   if (Check5fStatus(pScrn, 0x5f1c, pVbe->pInt10->ax)) {
      return TRUE;
   }
	
   return FALSE;
}

static Bool
SetPipeAccess(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);

   /* Don't try messing with the pipe, unless we're dual head */
   if (xf86IsEntityShared(pScrn->entityList[0]) || pI830->Clone || pI830->origPipe != pI830->pipe) {
      if (!SetBIOSPipe(pScrn, pI830->pipe))
         return FALSE;
   }
   
   return TRUE;
}

static Bool
I830Set640x480(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);
   int m = 0x30; /* 640x480 8bpp */

   switch (pScrn->depth) {
   case 15:
	 m = 0x40;
	 break;
   case 16:
	 m = 0x41;
	 break;
   case 24:
	 m = 0x50;
	 break;
   }
   m |= (1 << 15) | (1 << 14);
   return VBESetVBEMode(pI830->pVbe, m, NULL);
}