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linux
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
20static inline unsigned int g450_vco2f(unsigned char p, unsigned int fvco) {
21 return (p & 0x40) ? fvco : fvco >> ((p & 3) + 1);
22}
23
24static inline unsigned int g450_f2vco(unsigned char p, unsigned int fin) {
25 return (p & 0x40) ? fin : fin << ((p & 3) + 1);
26}
27
28static 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
36unsigned int g450_mnp2f(CPMINFO unsigned int mnp) {
37 return g450_vco2f(mnp, g450_mnp2vco(PMINFO mnp));
38}
39
40static 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
52static 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
98static 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
127static 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
162static 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
196static 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
214static int g450_testpll(CPMINFO unsigned int mnp, unsigned int pll) {
215 return g450_isplllocked(PMINFO g450_setpll(PMINFO mnp, pll));
216}
217
218static 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
228void 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
234static 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
277static 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
286static 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
306static 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;
320 unsigned long flags;
321
322 matroxfb_DAC_lock_irqsave(flags);
323 tmp = matroxfb_DAC_in(PMINFO M1064_XPIXCLKCTRL);
324 if (!(tmp & M1064_XPIXCLKCTRL_PLL_UP)) {
325 matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp | M1064_XPIXCLKCTRL_PLL_UP);
326 }
327 matroxfb_DAC_unlock_irqrestore(flags);
328 }
329 {
330 u_int8_t misc;
331
332 misc = mga_inb(M_MISC_REG_READ) & ~0x0C;
333 switch (pll) {
334 case M_PIXEL_PLL_A:
335 break;
336 case M_PIXEL_PLL_B:
337 misc |= 0x04;
338 break;
339 default:
340 misc |= 0x0C;
341 break;
342 }
343 mga_outb(M_MISC_REG, misc);
344 }
345 pi = &ACCESS_FBINFO(limits.pixel);
346 ci = &ACCESS_FBINFO(cache.pixel);
347 break;
348 case M_SYSTEM_PLL:
349 {
350 u_int32_t opt;
351
352 pci_read_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, &opt);
353 if (!(opt & 0x20)) {
354 pci_write_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, opt | 0x20);
355 }
356 }
357 pi = &ACCESS_FBINFO(limits.system);
358 ci = &ACCESS_FBINFO(cache.system);
359 break;
360 case M_VIDEO_PLL:
361 {
362 u_int8_t tmp;
363 unsigned int mnp;
364 unsigned long flags;
365
366 matroxfb_DAC_lock_irqsave(flags);
367 tmp = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
368 if (!(tmp & 2)) {
369 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, tmp | 2);
370 }
371
372 mnp = matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) << 16;
373 mnp |= matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) << 8;
374 pixel_vco = g450_mnp2vco(PMINFO mnp);
375 matroxfb_DAC_unlock_irqrestore(flags);
376 }
377 pi = &ACCESS_FBINFO(limits.video);
378 ci = &ACCESS_FBINFO(cache.video);
379 break;
380 default:
381 return -EINVAL;
382 }
383
384 mnpcount = 0;
385 {
386 unsigned int mnp;
387 unsigned int xvco;
388
389 for(mnp = g450_firstpll(PMINFO pi, &xvco, fout); mnp != NO_MORE_MNP; mnp = g450_nextpll(PMINFO pi, &xvco, mnp)) {
390 unsigned int idx;
391 unsigned int vco;
392 unsigned int delta;
393
394 vco = g450_mnp2vco(PMINFO mnp);
395#if 0
396 if (pll == M_VIDEO_PLL) {
397 unsigned int big, small;
398
399 if (vco < pixel_vco) {
400 small = vco;
401 big = pixel_vco;
402 } else {
403 small = pixel_vco;
404 big = vco;
405 }
406 while (big > small) {
407 big >>= 1;
408 }
409 if (big == small) {
410 continue;
411 }
412 }
413#endif
414 delta = pll_freq_delta(fout, g450_vco2f(mnp, vco));
415 for (idx = mnpcount; idx > 0; idx--) {
416 /* == is important; due to nextpll algorithm we get
417 sorted equally good frequencies from lower VCO
418 frequency to higher - with <= lowest wins, while
419 with < highest one wins */
420 if (delta <= deltaarray[idx-1]) {
421 mnparray[idx] = mnparray[idx-1];
422 deltaarray[idx] = deltaarray[idx-1];
423 } else {
424 break;
425 }
426 }
427 mnparray[idx] = mnp;
428 deltaarray[idx] = delta;
429 mnpcount++;
430 }
431 }
432 /* VideoPLL and PixelPLL matched: do nothing... In all other cases we should get at least one frequency */
433 if (!mnpcount) {
434 return -EBUSY;
435 }
436 {
437 unsigned long flags;
438 unsigned int mnp;
439
440 matroxfb_DAC_lock_irqsave(flags);
441 mnp = g450_checkcache(PMINFO ci, mnparray[0]);
442 if (mnp != NO_MORE_MNP) {
443 matroxfb_g450_setpll_cond(PMINFO mnp, pll);
444 } else {
445 mnp = g450_findworkingpll(PMINFO pll, mnparray, mnpcount);
446 g450_addcache(ci, mnparray[0], mnp);
447 }
448 updatehwstate_clk(&ACCESS_FBINFO(hw), mnp, pll);
449 matroxfb_DAC_unlock_irqrestore(flags);
450 return mnp;
451 }
452}
453
454/* It must be greater than number of possible PLL values.
455 * Currently there is 5(p) * 10(m) = 50 possible values. */
456#define MNP_TABLE_SIZE 64
457
458int matroxfb_g450_setclk(WPMINFO unsigned int fout, unsigned int pll) {
459 unsigned int* arr;
460
461 arr = kmalloc(sizeof(*arr) * MNP_TABLE_SIZE * 2, GFP_KERNEL);
462 if (arr) {
463 int r;
464
465 r = __g450_setclk(PMINFO fout, pll, arr, arr + MNP_TABLE_SIZE);
466 kfree(arr);
467 return r;
468 }
469 return -ENOMEM;
470}
471
472EXPORT_SYMBOL(matroxfb_g450_setclk);
473EXPORT_SYMBOL(g450_mnp2f);
474EXPORT_SYMBOL(matroxfb_g450_setpll_cond);
475
476MODULE_AUTHOR("(c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
477MODULE_DESCRIPTION("Matrox G450/G550 PLL driver");
478
479MODULE_LICENSE("GPL");