i810_accel.c

是由intel提供的针对intel显卡915以上系列的linux驱动

/**************************************************************************

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
All Rights Reserved.

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The above copyright notice and this permission notice (including the
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of the Software.

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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/i810/i810_accel.c,v 1.21 2004/01/02 20:22:17 dawes Exp $ */

/*
 * Reformatted with GNU indent (2.2.8), using the following options:
 *
 *    -bad -bap -c41 -cd0 -ncdb -ci6 -cli0 -cp0 -ncs -d0 -di3 -i3 -ip3 -l78
 *    -lp -npcs -psl -sob -ss -br -ce -sc -hnl
 *
 * This provides a good match with the original i810 code and preferred
 * XFree86 formatting conventions.
 *
 * When editing this driver, please follow the existing formatting, and edit
 * with <TAB> characters expanded at 8-column intervals.
 */

/*
 * Authors:
 *   Keith Whitwell <[e-mail]>
 *
 */

#include "xf86_ansic.h"
#include "xf86.h"
#include "xaarop.h"
#include "i810.h"

static void I810SetupForMono8x8PatternFill(ScrnInfoPtr pScrn,
					   int pattx, int patty,
					   int fg, int bg, int rop,
					   unsigned int planemask);
static void I810SubsequentMono8x8PatternFillRect(ScrnInfoPtr pScrn,
						 int pattx, int patty,
						 int x, int y, int w, int h);

static void I810SetupForScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn,
							   int fg, int bg,
							   int rop,
							   unsigned int mask);

static void I810SubsequentScanlineCPUToScreenColorExpandFill(ScrnInfoPtr
							     pScrn, int x,
							     int y, int w,
							     int h,
							     int skipleft);

static void I810SubsequentColorExpandScanline(ScrnInfoPtr pScrn, int bufno);

/* The following function sets up the supported acceleration. Call it
 * from the FbInit() function in the SVGA driver, or before ScreenInit
 * in a monolithic server.
 */
Bool
I810AccelInit(ScreenPtr pScreen)
{
   XAAInfoRecPtr infoPtr;
   ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
   I810Ptr pI810 = I810PTR(pScrn);

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
      ErrorF("I810AccelInit\n");

   pI810->AccelInfoRec = infoPtr = XAACreateInfoRec();
   if (!infoPtr)
      return FALSE;

   pI810->bufferOffset = 0;
   infoPtr->Flags = LINEAR_FRAMEBUFFER | OFFSCREEN_PIXMAPS;
   infoPtr->Flags |= PIXMAP_CACHE;

   /* Sync
    */
   infoPtr->Sync = I810Sync;

   /* Solid filled rectangles 
    */
   {
      infoPtr->SolidFillFlags = NO_PLANEMASK;
      infoPtr->SetupForSolidFill = I810SetupForSolidFill;
      infoPtr->SubsequentSolidFillRect = I810SubsequentSolidFillRect;
   }

   /* Screen to screen copy 
    *   - the transparency op hangs the blit engine, disable for now.
    */
   {
      infoPtr->ScreenToScreenCopyFlags = (0
					  | NO_PLANEMASK
					  | NO_TRANSPARENCY | 0);

      infoPtr->SetupForScreenToScreenCopy = I810SetupForScreenToScreenCopy;
      infoPtr->SubsequentScreenToScreenCopy =
	    I810SubsequentScreenToScreenCopy;
   }

   /* 8x8 pattern fills 
    */
   {
      infoPtr->SetupForMono8x8PatternFill = I810SetupForMono8x8PatternFill;
      infoPtr->SubsequentMono8x8PatternFillRect =
	    I810SubsequentMono8x8PatternFillRect;

      infoPtr->Mono8x8PatternFillFlags = (HARDWARE_PATTERN_PROGRAMMED_BITS |
					  HARDWARE_PATTERN_SCREEN_ORIGIN |
					  BIT_ORDER_IN_BYTE_MSBFIRST |
					  NO_PLANEMASK | 0);
   }

   /* 8x8 color fills - not considered useful for XAA.
    */

   /* Scanline color expansion - Use the same scheme as the 3.3 driver.  
    *
    */
   if (pI810->Scratch.Size != 0) {
      int i;
      int width = ((pScrn->displayWidth + 31) & ~31) / 8;
      int nr_buffers = pI810->Scratch.Size / width;
      unsigned char *ptr = pI810->FbBase + pI810->Scratch.Start;

      pI810->NumScanlineColorExpandBuffers = nr_buffers;
      pI810->ScanlineColorExpandBuffers = (unsigned char **)
	    xnfcalloc(nr_buffers, sizeof(unsigned char *));

      for (i = 0; i < nr_buffers; i++, ptr += width)
	 pI810->ScanlineColorExpandBuffers[i] = ptr;

      infoPtr->ScanlineCPUToScreenColorExpandFillFlags = (NO_PLANEMASK |
							  ROP_NEEDS_SOURCE |
							  BIT_ORDER_IN_BYTE_MSBFIRST
							  | 0);

      infoPtr->ScanlineColorExpandBuffers = (unsigned char **)
	    xnfcalloc(1, sizeof(unsigned char *));
      infoPtr->NumScanlineColorExpandBuffers = 1;

      infoPtr->ScanlineColorExpandBuffers[0] =
	    pI810->ScanlineColorExpandBuffers[0];
      pI810->nextColorExpandBuf = 0;

      infoPtr->SetupForScanlineCPUToScreenColorExpandFill =
	    I810SetupForScanlineCPUToScreenColorExpandFill;

      infoPtr->SubsequentScanlineCPUToScreenColorExpandFill =
	    I810SubsequentScanlineCPUToScreenColorExpandFill;

      infoPtr->SubsequentColorExpandScanline =
	    I810SubsequentColorExpandScanline;
   }

   /* Possible todo: Image writes w/ non-GXCOPY rop.
    */

   I810SelectBuffer(pScrn, I810_SELECT_FRONT);

   return XAAInit(pScreen, infoPtr);
}

int
I810WaitLpRing(ScrnInfoPtr pScrn, int n, int timeout_millis)
{
   I810Ptr pI810 = I810PTR(pScrn);
   I810RingBuffer *ring = pI810->LpRing;
   int iters = 0;
   int start = 0;
   int now = 0;
   int last_head = 0;
   int first = 0;

   /* If your system hasn't moved the head pointer in 2 seconds, I'm going to
    * call it crashed.
    */
   if (timeout_millis == 0)
      timeout_millis = 2000;

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
      ErrorF("I810WaitLpRing %d\n", n);
      first = GetTimeInMillis();
   }

   while (ring->space < n) {
      ring->head = INREG(LP_RING + RING_HEAD) & HEAD_ADDR;
      ring->space = ring->head - (ring->tail + 8);

      if (ring->space < 0)
	 ring->space += ring->mem.Size;

      iters++;
      now = GetTimeInMillis();
      if (start == 0 || now < start || ring->head != last_head) {
	 if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
	    if (now > start)
	       ErrorF("space: %d wanted %d\n", ring->space, n);
	 start = now;
	 last_head = ring->head;
      } else if (now - start > timeout_millis) {
	 ErrorF("Error in I810WaitLpRing(), now is %d, start is %d\n", now,
		start);
	 I810PrintErrorState(pScrn);
	 ErrorF("space: %d wanted %d\n", ring->space, n);
#ifdef XF86DRI
	 if (pI810->directRenderingEnabled) {
	    DRIUnlock(screenInfo.screens[pScrn->scrnIndex]);
	    DRICloseScreen(screenInfo.screens[pScrn->scrnIndex]);
	 }
#endif
	 pI810->AccelInfoRec = NULL;	/* Stops recursive behavior */
	 FatalError("lockup\n");
      }

      DELAY(10000);
   }

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
      now = GetTimeInMillis();
      if (now - first) {
	 ErrorF("Elapsed %d ms\n", now - first);
	 ErrorF("space: %d wanted %d\n", ring->space, n);
      }
   }

   return iters;
}

void
I810Sync(ScrnInfoPtr pScrn)
{
   I810Ptr pI810 = I810PTR(pScrn);

   if (I810_DEBUG & (DEBUG_VERBOSE_ACCEL | DEBUG_VERBOSE_SYNC))
      ErrorF("I810Sync\n");

#ifdef XF86DRI
   /* VT switching tries to do this.  
    */
   if (!pI810->LockHeld && pI810->directRenderingEnabled) {
      return;
   }
#endif

   /* Send a flush instruction and then wait till the ring is empty.
    * This is stronger than waiting for the blitter to finish as it also
    * flushes the internal graphics caches.
    */
   {
      BEGIN_LP_RING(2);
      OUT_RING(INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE);
      OUT_RING(0);			/* pad to quadword */
      ADVANCE_LP_RING();
   }

   I810WaitLpRing(pScrn, pI810->LpRing->mem.Size - 8, 0);

   pI810->LpRing->space = pI810->LpRing->mem.Size - 8;
   pI810->nextColorExpandBuf = 0;
}

void
I810SetupForSolidFill(ScrnInfoPtr pScrn, int color, int rop,
		      unsigned int planemask)
{
   I810Ptr pI810 = I810PTR(pScrn);

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
      ErrorF("I810SetupForFillRectSolid color: %x rop: %x mask: %x\n",
	     color, rop, planemask);

   /* Color blit, p166 */
   pI810->BR[13] = (BR13_SOLID_PATTERN |
		    (XAAGetPatternROP(rop) << 16) |
		    (pScrn->displayWidth * pI810->cpp));
   pI810->BR[16] = color;
}

void
I810SubsequentSolidFillRect(ScrnInfoPtr pScrn, int x, int y, int w, int h)
{
   I810Ptr pI810 = I810PTR(pScrn);

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
      ErrorF("I810SubsequentFillRectSolid %d,%d %dx%d\n", x, y, w, h);

   {
      BEGIN_LP_RING(6);

      OUT_RING(BR00_BITBLT_CLIENT | BR00_OP_COLOR_BLT | 0x3);
      OUT_RING(pI810->BR[13]);
      OUT_RING((h << 16) | (w * pI810->cpp));