xref: /xsrc/external/mit/xf86-video-intel-old/dist/src/i810_wmark.c

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

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

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"Software"), to deal in the Software without restriction, including
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The above copyright notice and this permission notice (including the
next paragraph) shall be included in all copies or substantial portions
of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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

/*
 * Authors:
 *   Keith Whitwell <keith@tungstengraphics.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"
#include "i810.h"

struct wm_info {
   double freq;
   unsigned int wm;
};

static struct wm_info i810_wm_8_100[] = {
   {0, 0x22003000},
   {25.2, 0x22003000},
   {28.0, 0x22003000},
   {31.5, 0x22003000},
   {36.0, 0x22007000},
   {40.0, 0x22007000},
   {45.0, 0x22007000},
   {49.5, 0x22008000},
   {50.0, 0x22008000},
   {56.3, 0x22008000},
   {65.0, 0x22008000},
   {75.0, 0x22008000},
   {78.8, 0x22008000},
   {80.0, 0x22008000},
   {94.0, 0x22008000},
   {96.0, 0x22107000},
   {99.0, 0x22107000},
   {108.0, 0x22107000},
   {121.0, 0x22107000},
   {128.9, 0x22107000},
   {132.0, 0x22109000},
   {135.0, 0x22109000},
   {157.5, 0x2210b000},
   {162.0, 0x2210b000},
   {175.5, 0x2210b000},
   {189.0, 0x2220e000},
   {202.5, 0x2220e000}
};

static struct wm_info i810_wm_16_100[] = {
   {0, 0x22004000},
   {25.2, 0x22006000},
   {28.0, 0x22006000},
   {31.5, 0x22007000},
   {36.0, 0x22007000},
   {40.0, 0x22007000},
   {45.0, 0x22007000},
   {49.5, 0x22009000},
   {50.0, 0x22009000},
   {56.3, 0x22108000},
   {65.0, 0x2210e000},
   {75.0, 0x2210e000},
   {78.8, 0x2210e000},
   {80.0, 0x22210000},
   {94.5, 0x22210000},
   {96.0, 0x22210000},
   {99.0, 0x22210000},
   {108.0, 0x22210000},
   {121.0, 0x22210000},
   {128.9, 0x22210000},
   {132.0, 0x22314000},
   {135.0, 0x22314000},
   {157.5, 0x22415000},
   {162.0, 0x22416000},
   {175.5, 0x22416000},
   {189.0, 0x22416000},
   {195.0, 0x22416000},
   {202.5, 0x22416000}
};

static struct wm_info i810_wm_24_100[] = {
   {0, 0x22006000},
   {25.2, 0x22009000},
   {28.0, 0x22009000},
   {31.5, 0x2200a000},
   {36.0, 0x2210c000},
   {40.0, 0x2210c000},
   {45.0, 0x2210c000},
   {49.5, 0x22111000},
   {50.0, 0x22111000},
   {56.3, 0x22111000},
   {65.0, 0x22214000},
   {75.0, 0x22214000},
   {78.8, 0x22215000},
   {80.0, 0x22216000},
   {94.5, 0x22218000},
   {96.0, 0x22418000},
   {99.0, 0x22418000},
   {108.0, 0x22418000},
   {121.0, 0x22418000},
   {128.9, 0x22419000},
   {132.0, 0x22519000},
   {135.0, 0x4441d000},
   {157.5, 0x44419000},
   {162.0, 0x44419000},
   {175.5, 0x44419000},
   {189.0, 0x44419000},
   {195.0, 0x44419000},
   {202.5, 0x44419000}
};

#if 0
/* not used */
static struct wm_info i810_wm_32_100[] = {
   {0, 0x2210b000},
   {60, 0x22415000},			/* 0x314000 works too */
   {80, 0x22419000}			/* 0x518000 works too */
};
#endif

static struct wm_info i810_wm_8_133[] = {
   {0, 0x22003000},
   {25.2, 0x22003000},
   {28.0, 0x22003000},
   {31.5, 0x22003000},
   {36.0, 0x22007000},
   {40.0, 0x22007000},
   {45.0, 0x22007000},
   {49.5, 0x22008000},
   {50.0, 0x22008000},
   {56.3, 0x22008000},
   {65.0, 0x22008000},
   {75.0, 0x22008000},
   {78.8, 0x22008000},
   {80.0, 0x22008000},
   {94.0, 0x22008000},
   {96.0, 0x22107000},
   {99.0, 0x22107000},
   {108.0, 0x22107000},
   {121.0, 0x22107000},
   {128.9, 0x22107000},
   {132.0, 0x22109000},
   {135.0, 0x22109000},
   {157.5, 0x2210b000},
   {162.0, 0x2210b000},
   {175.5, 0x2210b000},
   {189.0, 0x2220e000},
   {202.5, 0x2220e000}
};

static struct wm_info i810_wm_16_133[] = {
   {0, 0x22004000},
   {25.2, 0x22006000},
   {28.0, 0x22006000},
   {31.5, 0x22007000},
   {36.0, 0x22007000},
   {40.0, 0x22007000},
   {45.0, 0x22007000},
   {49.5, 0x22009000},
   {50.0, 0x22009000},
   {56.3, 0x22108000},
   {65.0, 0x2210e000},
   {75.0, 0x2210e000},
   {78.8, 0x2210e000},
   {80.0, 0x22210000},
   {94.5, 0x22210000},
   {96.0, 0x22210000},
   {99.0, 0x22210000},
   {108.0, 0x22210000},
   {121.0, 0x22210000},
   {128.9, 0x22210000},
   {132.0, 0x22314000},
   {135.0, 0x22314000},
   {157.5, 0x22415000},
   {162.0, 0x22416000},
   {175.5, 0x22416000},
   {189.0, 0x22416000},
   {195.0, 0x22416000},
   {202.5, 0x22416000}
};

static struct wm_info i810_wm_24_133[] = {
   {0, 0x22006000},
   {25.2, 0x22009000},
   {28.0, 0x22009000},
   {31.5, 0x2200a000},
   {36.0, 0x2210c000},
   {40.0, 0x2210c000},
   {45.0, 0x2210c000},
   {49.5, 0x22111000},
   {50.0, 0x22111000},
   {56.3, 0x22111000},
   {65.0, 0x22214000},
   {75.0, 0x22214000},
   {78.8, 0x22215000},
   {80.0, 0x22216000},
   {94.5, 0x22218000},
   {96.0, 0x22418000},
   {99.0, 0x22418000},
   {108.0, 0x22418000},
   {121.0, 0x22418000},
   {128.9, 0x22419000},
   {132.0, 0x22519000},
   {135.0, 0x4441d000},
   {157.5, 0x44419000},
   {162.0, 0x44419000},
   {175.5, 0x44419000},
   {189.0, 0x44419000},
   {195.0, 0x44419000},
   {202.5, 0x44419000}
};

#define Elements(x) (sizeof(x)/sizeof(*x))

/*
 * I810CalcFIFO --
 *
 * Calculate burst length and FIFO watermark.
 */

unsigned int
I810CalcWatermark(ScrnInfoPtr pScrn, double freq, Bool dcache)
{
   I810Ptr pI810 = I810PTR(pScrn);
   struct wm_info *tab;
   int nr;
   int i;

   if (pI810->LmFreqSel == 100) {
      switch (pScrn->bitsPerPixel) {
      case 8:
	 tab = i810_wm_8_100;
	 nr = Elements(i810_wm_8_100);
	 break;
      case 16:
	 tab = i810_wm_16_100;
	 nr = Elements(i810_wm_16_100);
	 break;
      case 24:
	 tab = i810_wm_24_100;
	 nr = Elements(i810_wm_24_100);
	 break;
      default:
	 return 0;
      }
   } else {
      switch (pScrn->bitsPerPixel) {
      case 8:
	 tab = i810_wm_8_133;
	 nr = Elements(i810_wm_8_133);
	 break;
      case 16:
	 tab = i810_wm_16_133;
	 nr = Elements(i810_wm_16_133);
	 break;
      case 24:
	 tab = i810_wm_24_133;
	 nr = Elements(i810_wm_24_133);
	 break;
      default:
	 return 0;
      }
   }

   for (i = 0; i < nr && tab[i].freq < freq; i++) ;

   if (i == nr)
      i--;

   xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, 3,
		  "chose watermark 0x%x: (tab.freq %.1f)\n",
		  tab[i].wm, tab[i].freq);

   /* None of these values (sourced from intel) have watermarks for
    * the dcache memory.  Fake it for now by using the same watermark
    * for both...
    *
    * Update: this is probably because dcache isn't real useful as
    * framebuffer memory, so intel's drivers don't need watermarks
    * for that memory because they never use it to feed the ramdacs.
    * We do use it in the fallback mode, so keep the watermarks for
    * now.
    */
   if (dcache)
      return (tab[i].wm & ~0xffffff) | ((tab[i].wm >> 12) & 0xfff);
   else
      return tab[i].wm;
}