drivers/video/matrox/g450_pll.c

   1 /*
   2  *
   3  * Hardware accelerated Matrox PCI cards - G450/G550 PLL control.
   4  *
   5  * (c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
   6  *
   7  * Portions Copyright (c) 2001 Matrox Graphics Inc.
   8  *
   9  * Version: 1.64 2002/06/10
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License. See the file COPYING in the main directory of this archive for
  13  * more details.
  14  *
  15  */
  16
  17 #include "g450_pll.h"
  18 #include "matroxfb_DAC1064.h"
  19
  20 static inline unsigned int g450_vco2f(unsigned char p, unsigned int fvco) {
  21         return (p & 0x40) ? fvco : fvco >> ((p & 3) + 1);
  22 }
  23
  24 static inline unsigned int g450_f2vco(unsigned char p, unsigned int fin) {
  25         return (p & 0x40) ? fin : fin << ((p & 3) + 1);
  26 }
  27
  28 static unsigned int g450_mnp2vco(CPMINFO unsigned int mnp) {
  29         unsigned int m, n;
  30
  31         m = ((mnp >> 16) & 0x0FF) + 1;
  32         n = ((mnp >>  7) & 0x1FE) + 4;
  33         return (ACCESS_FBINFO(features).pll.ref_freq * n + (m >> 1)) / m;
  34 }
  35
  36 unsigned int g450_mnp2f(CPMINFO unsigned int mnp) {
  37         return g450_vco2f(mnp, g450_mnp2vco(PMINFO mnp));
  38 }
  39
  40 static inline unsigned int pll_freq_delta(unsigned int f1, unsigned int f2) {
  41         if (f2 < f1) {
  42                 f2 = f1 - f2;
  43         } else {
  44                 f2 = f2 - f1;
  45         }
  46         return f2;
  47 }
  48
  49 #define NO_MORE_MNP     0x01FFFFFF
  50 #define G450_MNP_FREQBITS       (0xFFFFFF43)    /* do not mask high byte so we'll catch NO_MORE_MNP */
  51
  52 static unsigned int g450_nextpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* fvco, unsigned int mnp) {
  53         unsigned int m, n, p;
  54         unsigned int tvco = *fvco;
  55
  56         m = (mnp >> 16) & 0xFF;
  57         p = mnp & 0xFF;
  58
  59         do {
  60                 if (m == 0 || m == 0xFF) {
  61                         if (m == 0) {
  62                                 if (p & 0x40) {
  63                                         return NO_MORE_MNP;
  64                                 }
  65                                 if (p & 3) {
  66                                         p--;
  67                                 } else {
  68                                         p = 0x40;
  69                                 }
  70                                 tvco >>= 1;
  71                                 if (tvco < pi->vcomin) {
  72                                         return NO_MORE_MNP;
  73                                 }
  74                                 *fvco = tvco;
  75                         }
  76
  77                         p &= 0x43;
  78                         if (tvco < 550000) {
  79 /*                              p |= 0x00; */
  80                         } else if (tvco < 700000) {
  81                                 p |= 0x08;
  82                         } else if (tvco < 1000000) {
  83                                 p |= 0x10;
  84                         } else if (tvco < 1150000) {
  85                                 p |= 0x18;
  86                         } else {
  87                                 p |= 0x20;
  88                         }
  89                         m = 9;
  90                 } else {
  91                         m--;
  92                 }
  93                 n = ((tvco * (m+1) + ACCESS_FBINFO(features).pll.ref_freq) / (ACCESS_FBINFO(features).pll.ref_freq * 2)) - 2;
  94         } while (n < 0x03 || n > 0x7A);
  95         return (m << 16) | (n << 8) | p;
  96 }
  97
  98 static unsigned int g450_firstpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* vco, unsigned int fout) {
  99         unsigned int p;
 100         unsigned int vcomax;
 101
 102         vcomax = pi->vcomax;
 103         if (fout > (vcomax / 2)) {
 104                 if (fout > vcomax) {
 105                         *vco = vcomax;
 106                 } else {
 107                         *vco = fout;
 108                 }
 109                 p = 0x40;
 110         } else {
 111                 unsigned int tvco;
 112
 113                 p = 3;
 114                 tvco = g450_f2vco(p, fout);
 115                 while (p && (tvco > vcomax)) {
 116                         p--;
 117                         tvco >>= 1;
 118                 }
 119                 if (tvco < pi->vcomin) {
 120                         tvco = pi->vcomin;
 121                 }
 122                 *vco = tvco;
 123         }
 124         return g450_nextpll(PMINFO pi, vco, 0xFF0000 | p);
 125 }
 126
 127 static inline unsigned int g450_setpll(CPMINFO unsigned int mnp, unsigned int pll) {
 128         switch (pll) {
 129                 case M_PIXEL_PLL_A:
 130                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLAM, mnp >> 16);
 131                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLAN, mnp >> 8);
 132                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLAP, mnp);
 133                         return M1064_XPIXPLLSTAT;
 134
 135                 case M_PIXEL_PLL_B:
 136                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLBM, mnp >> 16);
 137                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLBN, mnp >> 8);
 138                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLBP, mnp);
 139                         return M1064_XPIXPLLSTAT;
 140
 141                 case M_PIXEL_PLL_C:
 142                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLCM, mnp >> 16);
 143                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLCN, mnp >> 8);
 144                         matroxfb_DAC_out(PMINFO M1064_XPIXPLLCP, mnp);
 145                         return M1064_XPIXPLLSTAT;
 146
 147                 case M_SYSTEM_PLL:
 148                         matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLM, mnp >> 16);
 149                         matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLN, mnp >> 8);
 150                         matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLP, mnp);
 151                         return DAC1064_XSYSPLLSTAT;
 152
 153                 case M_VIDEO_PLL:
 154                         matroxfb_DAC_out(PMINFO M1064_XVIDPLLM, mnp >> 16);
 155                         matroxfb_DAC_out(PMINFO M1064_XVIDPLLN, mnp >> 8);
 156                         matroxfb_DAC_out(PMINFO M1064_XVIDPLLP, mnp);
 157                         return M1064_XVIDPLLSTAT;
 158         }
 159         return 0;
 160 }
 161
 162 static inline unsigned int g450_cmppll(CPMINFO unsigned int mnp, unsigned int pll) {
 163         unsigned char m = mnp >> 16;
 164         unsigned char n = mnp >> 8;
 165         unsigned char p = mnp;
 166
 167         switch (pll) {
 168                 case M_PIXEL_PLL_A:
 169                         return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLAM) != m ||
 170                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLAN) != n ||
 171                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLAP) != p);
 172
 173                 case M_PIXEL_PLL_B:
 174                         return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLBM) != m ||
 175                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLBN) != n ||
 176                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLBP) != p);
 177
 178                 case M_PIXEL_PLL_C:
 179                         return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) != m ||
 180                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) != n ||
 181                                 matroxfb_DAC_in(PMINFO M1064_XPIXPLLCP) != p);
 182
 183                 case M_SYSTEM_PLL:
 184                         return (matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLM) != m ||
 185                                 matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLN) != n ||
 186                                 matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLP) != p);
 187
 188                 case M_VIDEO_PLL:
 189                         return (matroxfb_DAC_in(PMINFO M1064_XVIDPLLM) != m ||
 190                                 matroxfb_DAC_in(PMINFO M1064_XVIDPLLN) != n ||
 191                                 matroxfb_DAC_in(PMINFO M1064_XVIDPLLP) != p);
 192         }
 193         return 1;
 194 }
 195
 196 static inline int g450_isplllocked(CPMINFO unsigned int regidx) {
 197         unsigned int j;
 198
 199         for (j = 0; j < 1000; j++) {
 200                 if (matroxfb_DAC_in(PMINFO regidx) & 0x40) {
 201                         unsigned int r = 0;
 202                         int i;
 203
 204                         for (i = 0; i < 100; i++) {
 205                                 r += matroxfb_DAC_in(PMINFO regidx) & 0x40;
 206                         }
 207                         return r >= (90 * 0x40);
 208                 }
 209                 /* udelay(1)... but DAC_in is much slower... */
 210         }
 211         return 0;
 212 }
 213
 214 static int g450_testpll(CPMINFO unsigned int mnp, unsigned int pll) {
 215         return g450_isplllocked(PMINFO g450_setpll(PMINFO mnp, pll));
 216 }
 217
 218 static void updatehwstate_clk(struct matrox_hw_state* hw, unsigned int mnp, unsigned int pll) {
 219         switch (pll) {
 220                 case M_SYSTEM_PLL:
 221                         hw->DACclk[3] = mnp >> 16;
 222                         hw->DACclk[4] = mnp >> 8;
 223                         hw->DACclk[5] = mnp;
 224                         break;
 225         }
 226 }
 227
 228 void matroxfb_g450_setpll_cond(WPMINFO unsigned int mnp, unsigned int pll) {
 229         if (g450_cmppll(PMINFO mnp, pll)) {
 230                 g450_setpll(PMINFO mnp, pll);
 231         }
 232 }
 233
 234 static inline unsigned int g450_findworkingpll(WPMINFO unsigned int pll, unsigned int* mnparray, unsigned int mnpcount) {
 235         unsigned int found = 0;
 236         unsigned int idx;
 237         unsigned int mnpfound = mnparray[0];
 238
 239         for (idx = 0; idx < mnpcount; idx++) {
 240                 unsigned int sarray[3];
 241                 unsigned int *sptr;
 242                 {
 243                         unsigned int mnp;
 244
 245                         sptr = sarray;
 246                         mnp = mnparray[idx];
 247                         if (mnp & 0x38) {
 248                                 *sptr++ = mnp - 8;
 249                         }
 250                         if ((mnp & 0x38) != 0x38) {
 251                                 *sptr++ = mnp + 8;
 252                         }
 253                         *sptr = mnp;
 254                 }
 255                 while (sptr >= sarray) {
 256                         unsigned int mnp = *sptr--;
 257
 258                         if (g450_testpll(PMINFO mnp - 0x0300, pll) &&
 259                             g450_testpll(PMINFO mnp + 0x0300, pll) &&
 260                             g450_testpll(PMINFO mnp - 0x0200, pll) &&
 261                             g450_testpll(PMINFO mnp + 0x0200, pll) &&
 262                             g450_testpll(PMINFO mnp - 0x0100, pll) &&
 263                             g450_testpll(PMINFO mnp + 0x0100, pll)) {
 264                                 if (g450_testpll(PMINFO mnp, pll)) {
 265                                         return mnp;
 266                                 }
 267                         } else if (!found && g450_testpll(PMINFO mnp, pll)) {
 268                                 mnpfound = mnp;
 269                                 found = 1;
 270                         }
 271                 }
 272         }
 273         g450_setpll(PMINFO mnpfound, pll);
 274         return mnpfound;
 275 }
 276
 277 static void g450_addcache(struct matrox_pll_cache* ci, unsigned int mnp_key, unsigned int mnp_value) {
 278         if (++ci->valid > ARRAY_SIZE(ci->data)) {
 279                 ci->valid = ARRAY_SIZE(ci->data);
 280         }
 281         memmove(ci->data + 1, ci->data, (ci->valid - 1) * sizeof(*ci->data));
 282         ci->data[0].mnp_key = mnp_key & G450_MNP_FREQBITS;
 283         ci->data[0].mnp_value = mnp_value;
 284 }
 285
 286 static int g450_checkcache(WPMINFO struct matrox_pll_cache* ci, unsigned int mnp_key) {
 287         unsigned int i;
 288
 289         mnp_key &= G450_MNP_FREQBITS;
 290         for (i = 0; i < ci->valid; i++) {
 291                 if (ci->data[i].mnp_key == mnp_key) {
 292                         unsigned int mnp;
 293
 294                         mnp = ci->data[i].mnp_value;
 295                         if (i) {
 296                                 memmove(ci->data + 1, ci->data, i * sizeof(*ci->data));
 297                                 ci->data[0].mnp_key = mnp_key;
 298                                 ci->data[0].mnp_value = mnp;
 299                         }
 300                         return mnp;
 301                 }
 302         }
 303         return NO_MORE_MNP;
 304 }
 305
 306 static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
 307                 unsigned int* mnparray, unsigned int* deltaarray) {
 308         unsigned int mnpcount;
 309         unsigned int pixel_vco;
 310         const struct matrox_pll_limits* pi;
 311         struct matrox_pll_cache* ci;
 312
 313         pixel_vco = 0;
 314         switch (pll) {
 315                 case M_PIXEL_PLL_A:
 316                 case M_PIXEL_PLL_B:
 317                 case M_PIXEL_PLL_C:
 318                         {
 319                                 u_int8_t tmp, xpwrctrl;
 320                                 unsigned long flags;
 321
 322                                 matroxfb_DAC_lock_irqsave(flags);
 323
 324                                 xpwrctrl = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
 325                                 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl & ~M1064_XPWRCTRL_PANELPDN);
 326                                 mga_outb(M_SEQ_INDEX, M_SEQ1);
 327                                 mga_outb(M_SEQ_DATA, mga_inb(M_SEQ_DATA) | M_SEQ1_SCROFF);
 328                                 tmp = matroxfb_DAC_in(PMINFO M1064_XPIXCLKCTRL);
 329                                 tmp |= M1064_XPIXCLKCTRL_DIS;
 330                                 if (!(tmp & M1064_XPIXCLKCTRL_PLL_UP)) {
 331                                         tmp |= M1064_XPIXCLKCTRL_PLL_UP;
 332                                 }
 333                                 matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
 334 #ifdef __powerpc__
 335                                 /* This is necessary to avoid jitter on PowerPC
 336                                  * (OpenFirmware) systems, but apparently
 337                                  * introduces jitter, at least on a x86-64
 338                                  * using DVI.
 339                                  * A simple workaround is disable for non-PPC.
 340                                  */
 341                                 matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0);
 342 #endif /* __powerpc__ */
 343                                 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl);
 344
 345                                 matroxfb_DAC_unlock_irqrestore(flags);
 346                         }
 347                         {
 348                                 u_int8_t misc;
 349
 350                                 misc = mga_inb(M_MISC_REG_READ) & ~0x0C;
 351                                 switch (pll) {
 352                                         case M_PIXEL_PLL_A:
 353                                                 break;
 354                                         case M_PIXEL_PLL_B:
 355                                                 misc |=  0x04;
 356                                                 break;
 357                                         default:
 358                                                 misc |=  0x0C;
 359                                                 break;
 360                                 }
 361                                 mga_outb(M_MISC_REG, misc);
 362                         }
 363                         pi = &ACCESS_FBINFO(limits.pixel);
 364                         ci = &ACCESS_FBINFO(cache.pixel);
 365                         break;
 366                 case M_SYSTEM_PLL:
 367                         {
 368                                 u_int32_t opt;
 369
 370                                 pci_read_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, &opt);
 371                                 if (!(opt & 0x20)) {
 372                                         pci_write_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, opt | 0x20);
 373                                 }
 374                         }
 375                         pi = &ACCESS_FBINFO(limits.system);
 376                         ci = &ACCESS_FBINFO(cache.system);
 377                         break;
 378                 case M_VIDEO_PLL:
 379                         {
 380                                 u_int8_t tmp;
 381                                 unsigned int mnp;
 382                                 unsigned long flags;
 383
 384                                 matroxfb_DAC_lock_irqsave(flags);
 385                                 tmp = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
 386                                 if (!(tmp & 2)) {
 387                                         matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, tmp | 2);
 388                                 }
 389
 390                                 mnp = matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) << 16;
 391                                 mnp |= matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) << 8;
 392                                 pixel_vco = g450_mnp2vco(PMINFO mnp);
 393                                 matroxfb_DAC_unlock_irqrestore(flags);
 394                         }
 395                         pi = &ACCESS_FBINFO(limits.video);
 396                         ci = &ACCESS_FBINFO(cache.video);
 397                         break;
 398                 default:
 399                         return -EINVAL;
 400         }
 401
 402         mnpcount = 0;
 403         {
 404                 unsigned int mnp;
 405                 unsigned int xvco;
 406
 407                 for(mnp = g450_firstpll(PMINFO pi, &xvco, fout); mnp != NO_MORE_MNP; mnp = g450_nextpll(PMINFO pi, &xvco, mnp)) {
 408                         unsigned int idx;
 409                         unsigned int vco;
 410                         unsigned int delta;
 411
 412                         vco = g450_mnp2vco(PMINFO mnp);
 413 #if 0
 414                         if (pll == M_VIDEO_PLL) {
 415                                 unsigned int big, small;
 416
 417                                 if (vco < pixel_vco) {
 418                                         small = vco;
 419                                         big = pixel_vco;
 420                                 } else {
 421                                         small = pixel_vco;
 422                                         big = vco;
 423                                 }
 424                                 while (big > small) {
 425                                         big >>= 1;
 426                                 }
 427                                 if (big == small) {
 428                                         continue;
 429                                 }
 430                         }
 431 #endif
 432                         delta = pll_freq_delta(fout, g450_vco2f(mnp, vco));
 433                         for (idx = mnpcount; idx > 0; idx--) {
 434                                 /* == is important; due to nextpll algorithm we get
 435                                    sorted equally good frequencies from lower VCO
 436                                    frequency to higher - with <= lowest wins, while
 437                                    with < highest one wins */
 438                                 if (delta <= deltaarray[idx-1]) {
 439                                         /* all else being equal except VCO,
 440                                          * choose VCO not near (within 1/16th or so) VCOmin
 441                                          * (freqs near VCOmin aren't as stable)
 442                                          */
 443                                         if (delta == deltaarray[idx-1]
 444                                             && vco != g450_mnp2vco(PMINFO mnparray[idx-1])
 445                                             && vco < (pi->vcomin * 17 / 16)) {
 446                                                 break;
 447                                         }
 448                                         mnparray[idx] = mnparray[idx-1];
 449                                         deltaarray[idx] = deltaarray[idx-1];
 450                                 } else {
 451                                         break;
 452                                 }
 453                         }
 454                         mnparray[idx] = mnp;
 455                         deltaarray[idx] = delta;
 456                         mnpcount++;
 457                 }
 458         }
 459         /* VideoPLL and PixelPLL matched: do nothing... In all other cases we should get at least one frequency */
 460         if (!mnpcount) {
 461                 return -EBUSY;
 462         }
 463         {
 464                 unsigned long flags;
 465                 unsigned int mnp;
 466
 467                 matroxfb_DAC_lock_irqsave(flags);
 468                 mnp = g450_checkcache(PMINFO ci, mnparray[0]);
 469                 if (mnp != NO_MORE_MNP) {
 470                         matroxfb_g450_setpll_cond(PMINFO mnp, pll);
 471                 } else {
 472                         mnp = g450_findworkingpll(PMINFO pll, mnparray, mnpcount);
 473                         g450_addcache(ci, mnparray[0], mnp);
 474                 }
 475                 updatehwstate_clk(&ACCESS_FBINFO(hw), mnp, pll);
 476                 matroxfb_DAC_unlock_irqrestore(flags);
 477                 return mnp;
 478         }
 479 }
 480
 481 /* It must be greater than number of possible PLL values.
 482  * Currently there is 5(p) * 10(m) = 50 possible values. */
 483 #define MNP_TABLE_SIZE  64
 484
 485 int matroxfb_g450_setclk(WPMINFO unsigned int fout, unsigned int pll) {
 486         unsigned int* arr;
 487
 488         arr = kmalloc(sizeof(*arr) * MNP_TABLE_SIZE * 2, GFP_KERNEL);
 489         if (arr) {
 490                 int r;
 491
 492                 r = __g450_setclk(PMINFO fout, pll, arr, arr + MNP_TABLE_SIZE);
 493                 kfree(arr);
 494                 return r;
 495         }
 496         return -ENOMEM;
 497 }
 498
 499 EXPORT_SYMBOL(matroxfb_g450_setclk);
 500 EXPORT_SYMBOL(g450_mnp2f);
 501 EXPORT_SYMBOL(matroxfb_g450_setpll_cond);
 502
 503 MODULE_AUTHOR("(c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
 504 MODULE_DESCRIPTION("Matrox G450/G550 PLL driver");
 505
 506 MODULE_LICENSE("GPL");