drivers/video/fbdev/i810/i810_gtf.c

   1 /*-*- linux-c -*-
   2  *  linux/drivers/video/i810_main.h -- Intel 810 Non-discrete Video Timings
   3  *                                     (VESA GTF)
   4  *
   5  *      Copyright (C) 2001 Antonino Daplas<adaplas@pol.net>
   6  *      All Rights Reserved
   7  *
   8  *
   9  *  This file is subject to the terms and conditions of the GNU General Public
  10  *  License. See the file COPYING in the main directory of this archive for
  11  *  more details.
  12  */
  13 #include <linux/kernel.h>
  14
  15 #include "i810_regs.h"
  16 #include "i810.h"
  17 #include "i810_main.h"
  18
  19 /*
  20  * FIFO and Watermark tables - based almost wholly on i810_wmark.c in
  21  * XFree86 v4.03 by Precision Insight.  Slightly modified for integer
  22  * operation, instead of float
  23  */
  24
  25 struct wm_info {
  26    u32 freq;
  27    u32  wm;
  28 };
  29
  30 static struct wm_info i810_wm_8_100[] = {
  31         { 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
  32         { 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
  33         { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
  34         { 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
  35         { 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
  36         { 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
  37         { 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
  38         { 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
  39         { 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
  40         { 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
  41         { 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
  42 };
  43
  44 static struct wm_info i810_wm_16_100[] = {
  45         { 15, 0x0070c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
  46         { 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
  47         { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
  48         { 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
  49         { 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
  50         { 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
  51         { 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
  52         { 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
  53         { 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
  54         { 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
  55         { 218, 0x22416000 }, { 229, 0x22416000 },
  56 };
  57
  58 static struct wm_info i810_wm_24_100[] = {
  59         { 15, 0x0020c000 },  { 19, 0x0040c000 },  { 25, 0x22009000 },
  60         { 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
  61         { 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
  62         { 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
  63         { 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
  64         { 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
  65         { 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
  66         { 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
  67         { 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
  68         { 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
  69 };
  70
  71 static struct wm_info i810_wm_8_133[] = {
  72         { 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
  73         { 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
  74         { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
  75         { 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
  76         { 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
  77         { 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
  78         { 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
  79         { 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
  80         { 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
  81         { 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
  82         { 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
  83 };
  84
  85 static struct wm_info i810_wm_16_133[] = {
  86         { 15, 0x0020c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
  87         { 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
  88         { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
  89         { 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
  90         { 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
  91         { 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
  92         { 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
  93         { 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
  94         { 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
  95         { 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
  96         { 218, 0x22416000 }, { 229, 0x22416000 },
  97 };
  98
  99 static struct wm_info i810_wm_24_133[] = {
 100         { 15, 0x0020c000 },  { 19, 0x00408000 },  { 25, 0x22009000 },
 101         { 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
 102         { 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
 103         { 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
 104         { 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
 105         { 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
 106         { 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
 107         { 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
 108         { 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
 109         { 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
 110 };
 111
 112 void round_off_xres(u32 *xres) { }
 113 void round_off_yres(u32 *xres, u32 *yres) { }
 114
 115 /**
 116  * i810fb_encode_registers - encode @var to hardware register values
 117  * @var: pointer to var structure
 118  * @par: pointer to hardware par structure
 119  *
 120  * DESCRIPTION:
 121  * Timing values in @var will be converted to appropriate
 122  * register values of @par.
 123  */
 124 void i810fb_encode_registers(const struct fb_var_screeninfo *var,
 125                              struct i810fb_par *par, u32 xres, u32 yres)
 126 {
 127         int n, blank_s, blank_e;
 128         u8 __iomem *mmio = par->mmio_start_virtual;
 129         u8 msr = 0;
 130
 131         /* Horizontal */
 132         /* htotal */
 133         n = ((xres + var->right_margin + var->hsync_len +
 134               var->left_margin) >> 3) - 5;
 135         par->regs.cr00 =  (u8) n;
 136         par->regs.cr35 = (u8) ((n >> 8) & 1);
 137
 138         /* xres */
 139         par->regs.cr01 = (u8) ((xres >> 3) - 1);
 140
 141         /* hblank */
 142         blank_e = (xres + var->right_margin + var->hsync_len +
 143                    var->left_margin) >> 3;
 144         blank_e--;
 145         blank_s = blank_e - 127;
 146         if (blank_s < (xres >> 3))
 147                 blank_s = xres >> 3;
 148         par->regs.cr02 = (u8) blank_s;
 149         par->regs.cr03 = (u8) (blank_e & 0x1F);
 150         par->regs.cr05 = (u8) ((blank_e & (1 << 5)) << 2);
 151         par->regs.cr39 = (u8) ((blank_e >> 6) & 1);
 152
 153         /* hsync */
 154         par->regs.cr04 = (u8) ((xres + var->right_margin) >> 3);
 155         par->regs.cr05 |= (u8) (((xres + var->right_margin +
 156                                   var->hsync_len) >> 3) & 0x1F);
 157
 158         /* Vertical */
 159         /* vtotal */
 160         n = yres + var->lower_margin + var->vsync_len + var->upper_margin - 2;
 161         par->regs.cr06 = (u8) (n & 0xFF);
 162         par->regs.cr30 = (u8) ((n >> 8) & 0x0F);
 163
 164         /* vsync */
 165         n = yres + var->lower_margin;
 166         par->regs.cr10 = (u8) (n & 0xFF);
 167         par->regs.cr32 = (u8) ((n >> 8) & 0x0F);
 168         par->regs.cr11 = i810_readb(CR11, mmio) & ~0x0F;
 169         par->regs.cr11 |= (u8) ((yres + var->lower_margin +
 170                                  var->vsync_len) & 0x0F);
 171
 172         /* yres */
 173         n = yres - 1;
 174         par->regs.cr12 = (u8) (n & 0xFF);
 175         par->regs.cr31 = (u8) ((n >> 8) & 0x0F);
 176
 177         /* vblank */
 178         blank_e = yres + var->lower_margin + var->vsync_len +
 179                 var->upper_margin;
 180         blank_e--;
 181         blank_s = blank_e - 127;
 182         if (blank_s < yres)
 183                 blank_s = yres;
 184         par->regs.cr15 = (u8) (blank_s & 0xFF);
 185         par->regs.cr33 = (u8) ((blank_s >> 8) & 0x0F);
 186         par->regs.cr16 = (u8) (blank_e & 0xFF);
 187         par->regs.cr09 = 0;
 188
 189         /* sync polarity */
 190         if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
 191                 msr |= 1 << 6;
 192         if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
 193                 msr |= 1 << 7;
 194         par->regs.msr = msr;
 195
 196         /* interlace */
 197         if (var->vmode & FB_VMODE_INTERLACED)
 198                 par->interlace = (1 << 7) | ((u8) (var->yres >> 4));
 199         else
 200                 par->interlace = 0;
 201
 202         if (var->vmode & FB_VMODE_DOUBLE)
 203                 par->regs.cr09 |= 1 << 7;
 204
 205         /* overlay */
 206         par->ovract = ((var->xres + var->right_margin + var->hsync_len +
 207                         var->left_margin - 32) | ((var->xres - 32) << 16));
 208 }
 209
 210 void i810fb_fill_var_timings(struct fb_var_screeninfo *var) { }
 211
 212 /**
 213  * i810_get_watermark - gets watermark
 214  * @var: pointer to fb_var_screeninfo
 215  * @par: pointer to i810fb_par structure
 216  *
 217  * DESCRIPTION:
 218  * Gets the required watermark based on
 219  * pixelclock and RAMBUS frequency.
 220  *
 221  * RETURNS:
 222  * watermark
 223  */
 224 u32 i810_get_watermark(const struct fb_var_screeninfo *var,
 225                        struct i810fb_par *par)
 226 {
 227         struct wm_info *wmark = NULL;
 228         u32 i, size = 0, pixclock, wm_best = 0, min, diff;
 229
 230         if (par->mem_freq == 100) {
 231                 switch (var->bits_per_pixel) {
 232                 case 8:
 233                         wmark = i810_wm_8_100;
 234                         size = ARRAY_SIZE(i810_wm_8_100);
 235                         break;
 236                 case 16:
 237                         wmark = i810_wm_16_100;
 238                         size = ARRAY_SIZE(i810_wm_16_100);
 239                         break;
 240                 case 24:
 241                 case 32:
 242                         wmark = i810_wm_24_100;
 243                         size = ARRAY_SIZE(i810_wm_24_100);
 244                 }
 245         } else {
 246                 switch(var->bits_per_pixel) {
 247                 case 8:
 248                         wmark = i810_wm_8_133;
 249                         size = ARRAY_SIZE(i810_wm_8_133);
 250                         break;
 251                 case 16:
 252                         wmark = i810_wm_16_133;
 253                         size = ARRAY_SIZE(i810_wm_16_133);
 254                         break;
 255                 case 24:
 256                 case 32:
 257                         wmark = i810_wm_24_133;
 258                         size = ARRAY_SIZE(i810_wm_24_133);
 259                 }
 260         }
 261
 262         pixclock = 1000000/var->pixclock;
 263         min = ~0;
 264         for (i = 0; i < size; i++) {
 265                 if (pixclock <= wmark[i].freq)
 266                         diff = wmark[i].freq - pixclock;
 267                 else
 268                         diff = pixclock - wmark[i].freq;
 269                 if (diff < min) {
 270                         wm_best = wmark[i].wm;
 271                         min = diff;
 272                 }
 273         }
 274         return wm_best;
 275 }
 276