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+
+/**************************************************************************
+
+Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sub license, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+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
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/i810/i810_wmark.c,v 1.8 2002/10/30 12:52:18 alanh 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 <keith@tungstengraphics.com>
+ */
+
+#include "xf86.h"
+#include "i810.h"
+
+struct wm_info {
+ double freq;
+ unsigned int wm;
+};
+
+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}
+};
+
+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}
+};
+
+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}
+};
+
+struct wm_info i810_wm_32_100[] = {
+ {0, 0x2210b000},
+ {60, 0x22415000}, /* 0x314000 works too */
+ {80, 0x22419000} /* 0x518000 works too */
+};
+
+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}
+};
+
+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}
+};
+
+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;
+}
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