aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/matrox/g450_pll.c
blob: d42346e7fdda104da9e64776c21f3b8332812a7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
/*
 *
 * Hardware accelerated Matrox PCI cards - G450/G550 PLL control.
 *
 * (c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
 *
 * Portions Copyright (c) 2001 Matrox Graphics Inc.
 *
 * Version: 1.64 2002/06/10
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of this archive for
 * more details.
 *
 */

#include "g450_pll.h"
#include "matroxfb_DAC1064.h"

static inline unsigned int g450_vco2f(unsigned char p, unsigned int fvco) {
	return (p & 0x40) ? fvco : fvco >> ((p & 3) + 1);
}

static inline unsigned int g450_f2vco(unsigned char p, unsigned int fin) {
	return (p & 0x40) ? fin : fin << ((p & 3) + 1);
}

static unsigned int g450_mnp2vco(CPMINFO unsigned int mnp) {
	unsigned int m, n;

	m = ((mnp >> 16) & 0x0FF) + 1;
	n = ((mnp >>  7) & 0x1FE) + 4;
	return (ACCESS_FBINFO(features).pll.ref_freq * n + (m >> 1)) / m;
}

unsigned int g450_mnp2f(CPMINFO unsigned int mnp) {
	return g450_vco2f(mnp, g450_mnp2vco(PMINFO mnp));
}

static inline unsigned int pll_freq_delta(unsigned int f1, unsigned int f2) {
	if (f2 < f1) {
    		f2 = f1 - f2;
	} else {
		f2 = f2 - f1;
	}
	return f2;
}

#define NO_MORE_MNP	0x01FFFFFF
#define G450_MNP_FREQBITS	(0xFFFFFF43)	/* do not mask high byte so we'll catch NO_MORE_MNP */

static unsigned int g450_nextpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* fvco, unsigned int mnp) {
	unsigned int m, n, p;
	unsigned int tvco = *fvco;

	m = (mnp >> 16) & 0xFF;
	p = mnp & 0xFF;

	do {
		if (m == 0 || m == 0xFF) {
			if (m == 0) {
				if (p & 0x40) {
					return NO_MORE_MNP;
				}
			        if (p & 3) {
					p--;
				} else {
					p = 0x40;
				}
				tvco >>= 1;
				if (tvco < pi->vcomin) {
					return NO_MORE_MNP;
				}
				*fvco = tvco;
			}

			p &= 0x43;
			if (tvco < 550000) {
/*				p |= 0x00; */
			} else if (tvco < 700000) {
				p |= 0x08;
			} else if (tvco < 1000000) {
				p |= 0x10;
			} else if (tvco < 1150000) {
				p |= 0x18;
			} else {
				p |= 0x20;
			}
			m = 9;
		} else {
			m--;
		}
        	n = ((tvco * (m+1) + ACCESS_FBINFO(features).pll.ref_freq) / (ACCESS_FBINFO(features).pll.ref_freq * 2)) - 2;
	} while (n < 0x03 || n > 0x7A);
	return (m << 16) | (n << 8) | p;
}

static unsigned int g450_firstpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* vco, unsigned int fout) {
	unsigned int p;
	unsigned int vcomax;

	vcomax = pi->vcomax;
	if (fout > (vcomax / 2)) {
		if (fout > vcomax) {
			*vco = vcomax;
		} else {
			*vco = fout;
		}
		p = 0x40;
	} else {
		unsigned int tvco;

		p = 3;
		tvco = g450_f2vco(p, fout);
		while (p && (tvco > vcomax)) {
			p--;
			tvco >>= 1;
		}
		if (tvco < pi->vcomin) {
			tvco = pi->vcomin;
		}
		*vco = tvco;
	}
	return g450_nextpll(PMINFO pi, vco, 0xFF0000 | p);
}

static inline unsigned int g450_setpll(CPMINFO unsigned int mnp, unsigned int pll) {
	switch (pll) {
		case M_PIXEL_PLL_A:
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLAM, mnp >> 16);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLAN, mnp >> 8);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLAP, mnp);
			return M1064_XPIXPLLSTAT;

		case M_PIXEL_PLL_B:
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLBM, mnp >> 16);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLBN, mnp >> 8);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLBP, mnp);
			return M1064_XPIXPLLSTAT;

		case M_PIXEL_PLL_C:
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLCM, mnp >> 16);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLCN, mnp >> 8);
			matroxfb_DAC_out(PMINFO M1064_XPIXPLLCP, mnp);
			return M1064_XPIXPLLSTAT;

		case M_SYSTEM_PLL:
			matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLM, mnp >> 16);
			matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLN, mnp >> 8);
			matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLP, mnp);
			return DAC1064_XSYSPLLSTAT;

		case M_VIDEO_PLL:
			matroxfb_DAC_out(PMINFO M1064_XVIDPLLM, mnp >> 16);
			matroxfb_DAC_out(PMINFO M1064_XVIDPLLN, mnp >> 8);
			matroxfb_DAC_out(PMINFO M1064_XVIDPLLP, mnp);
			return M1064_XVIDPLLSTAT;
	}
	return 0;
}

static inline unsigned int g450_cmppll(CPMINFO unsigned int mnp, unsigned int pll) {
	unsigned char m = mnp >> 16;
	unsigned char n = mnp >> 8;
	unsigned char p = mnp;

	switch (pll) {
		case M_PIXEL_PLL_A:
			return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLAM) != m ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLAN) != n ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLAP) != p);

		case M_PIXEL_PLL_B:
			return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLBM) != m ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLBN) != n ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLBP) != p);

		case M_PIXEL_PLL_C:
			return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) != m ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) != n ||
				matroxfb_DAC_in(PMINFO M1064_XPIXPLLCP) != p);

		case M_SYSTEM_PLL:
			return (matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLM) != m ||
				matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLN) != n ||
				matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLP) != p);

		case M_VIDEO_PLL:
			return (matroxfb_DAC_in(PMINFO M1064_XVIDPLLM) != m ||
				matroxfb_DAC_in(PMINFO M1064_XVIDPLLN) != n ||
				matroxfb_DAC_in(PMINFO M1064_XVIDPLLP) != p);
	}
	return 1;
}

static inline int g450_isplllocked(CPMINFO unsigned int regidx) {
	unsigned int j;

	for (j = 0; j < 1000; j++) {
		if (matroxfb_DAC_in(PMINFO regidx) & 0x40) {
			unsigned int r = 0;
			int i;

			for (i = 0; i < 100; i++) {
				r += matroxfb_DAC_in(PMINFO regidx) & 0x40;
			}
			return r >= (90 * 0x40);
		}
		/* udelay(1)... but DAC_in is much slower... */
	}
	return 0;
}

static int g450_testpll(CPMINFO unsigned int mnp, unsigned int pll) {
	return g450_isplllocked(PMINFO g450_setpll(PMINFO mnp, pll));
}

static void updatehwstate_clk(struct matrox_hw_state* hw, unsigned int mnp, unsigned int pll) {
	switch (pll) {
		case M_SYSTEM_PLL:
			hw->DACclk[3] = mnp >> 16;
			hw->DACclk[4] = mnp >> 8;
			hw->DACclk[5] = mnp;
			break;
	}
}

void matroxfb_g450_setpll_cond(WPMINFO unsigned int mnp, unsigned int pll) {
	if (g450_cmppll(PMINFO mnp, pll)) {
		g450_setpll(PMINFO mnp, pll);
	}
}

static inline unsigned int g450_findworkingpll(WPMINFO unsigned int pll, unsigned int* mnparray, unsigned int mnpcount) {
	unsigned int found = 0;
	unsigned int idx;
	unsigned int mnpfound = mnparray[0];
		
	for (idx = 0; idx < mnpcount; idx++) {
		unsigned int sarray[3];
		unsigned int *sptr;
		{
			unsigned int mnp;
		
			sptr = sarray;
			mnp = mnparray[idx];
			if (mnp & 0x38) {
				*sptr++ = mnp - 8;
			}
			if ((mnp & 0x38) != 0x38) {
				*sptr++ = mnp + 8;
			}
			*sptr = mnp;
		}
		while (sptr >= sarray) {
			unsigned int mnp = *sptr--;
		
			if (g450_testpll(PMINFO mnp - 0x0300, pll) &&
			    g450_testpll(PMINFO mnp + 0x0300, pll) &&
			    g450_testpll(PMINFO mnp - 0x0200, pll) &&
			    g450_testpll(PMINFO mnp + 0x0200, pll) &&
			    g450_testpll(PMINFO mnp - 0x0100, pll) &&
			    g450_testpll(PMINFO mnp + 0x0100, pll)) {
				if (g450_testpll(PMINFO mnp, pll)) {
					return mnp;
				}
			} else if (!found && g450_testpll(PMINFO mnp, pll)) {
				mnpfound = mnp;
				found = 1;
			}
		}
	}
	g450_setpll(PMINFO mnpfound, pll);
	return mnpfound;
}

static void g450_addcache(struct matrox_pll_cache* ci, unsigned int mnp_key, unsigned int mnp_value) {
	if (++ci->valid > ARRAY_SIZE(ci->data)) {
		ci->valid = ARRAY_SIZE(ci->data);
	}
	memmove(ci->data + 1, ci->data, (ci->valid - 1) * sizeof(*ci->data));
	ci->data[0].mnp_key = mnp_key & G450_MNP_FREQBITS;
	ci->data[0].mnp_value = mnp_value;
}

static int g450_checkcache(WPMINFO struct matrox_pll_cache* ci, unsigned int mnp_key) {
	unsigned int i;
	
	mnp_key &= G450_MNP_FREQBITS;
	for (i = 0; i < ci->valid; i++) {
		if (ci->data[i].mnp_key == mnp_key) {
			unsigned int mnp;
			
			mnp = ci->data[i].mnp_value;
			if (i) {
				memmove(ci->data + 1, ci->data, i * sizeof(*ci->data));
				ci->data[0].mnp_key = mnp_key;
				ci->data[0].mnp_value = mnp;
			}
			return mnp;
		}
	}
	return NO_MORE_MNP;
}

static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll, 
		unsigned int* mnparray, unsigned int* deltaarray) {
	unsigned int mnpcount;
	unsigned int pixel_vco;
	const struct matrox_pll_limits* pi;
	struct matrox_pll_cache* ci;

	pixel_vco = 0;
	switch (pll) {
		case M_PIXEL_PLL_A:
		case M_PIXEL_PLL_B:
		case M_PIXEL_PLL_C:
			{
				u_int8_t tmp, xpwrctrl;
				unsigned long flags;
				
				matroxfb_DAC_lock_irqsave(flags);

				xpwrctrl = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
				matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl & ~M1064_XPWRCTRL_PANELPDN);
				mga_outb(M_SEQ_INDEX, M_SEQ1);
				mga_outb(M_SEQ_DATA, mga_inb(M_SEQ_DATA) | M_SEQ1_SCROFF);
				tmp = matroxfb_DAC_in(PMINFO M1064_XPIXCLKCTRL);
				tmp |= M1064_XPIXCLKCTRL_DIS;
				if (!(tmp & M1064_XPIXCLKCTRL_PLL_UP)) {
					tmp |= M1064_XPIXCLKCTRL_PLL_UP;
				}
				matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
				/* DVI PLL preferred for frequencies up to
				   panel link max, standard PLL otherwise */
				if (fout >= MINFO->max_pixel_clock_panellink)
					tmp = 0;
				else tmp =
					M1064_XDVICLKCTRL_DVIDATAPATHSEL |
					M1064_XDVICLKCTRL_C1DVICLKSEL |
					M1064_XDVICLKCTRL_C1DVICLKEN |
					M1064_XDVICLKCTRL_DVILOOPCTL |
					M1064_XDVICLKCTRL_P1LOOPBWDTCTL;
				matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL,tmp);
				matroxfb_DAC_out(PMINFO M1064_XPWRCTRL,
						 xpwrctrl);

				matroxfb_DAC_unlock_irqrestore(flags);
			}
			{
				u_int8_t misc;
		
				misc = mga_inb(M_MISC_REG_READ) & ~0x0C;
				switch (pll) {
					case M_PIXEL_PLL_A:
						break;
					case M_PIXEL_PLL_B:
						misc |=  0x04;
						break;
					default:
						misc |=  0x0C;
						break;
				}
				mga_outb(M_MISC_REG, misc);
			}
			pi = &ACCESS_FBINFO(limits.pixel);
			ci = &ACCESS_FBINFO(cache.pixel);
			break;
		case M_SYSTEM_PLL:
			{
				u_int32_t opt;

				pci_read_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, &opt);
				if (!(opt & 0x20)) {
					pci_write_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, opt | 0x20);
				}
			}
			pi = &ACCESS_FBINFO(limits.system);
			ci = &ACCESS_FBINFO(cache.system);
			break;
		case M_VIDEO_PLL:
			{
				u_int8_t tmp;
				unsigned int mnp;
				unsigned long flags;
				
				matroxfb_DAC_lock_irqsave(flags);
				tmp = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
				if (!(tmp & 2)) {
					matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, tmp | 2);
				}
				
				mnp = matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) << 16;
				mnp |= matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) << 8;
				pixel_vco = g450_mnp2vco(PMINFO mnp);
				matroxfb_DAC_unlock_irqrestore(flags);
			}
			pi = &ACCESS_FBINFO(limits.video);
			ci = &ACCESS_FBINFO(cache.video);
			break;
		default:
			return -EINVAL;
	}

	mnpcount = 0;
	{
		unsigned int mnp;
		unsigned int xvco;

		for(mnp = g450_firstpll(PMINFO pi, &xvco, fout); mnp != NO_MORE_MNP; mnp = g450_nextpll(PMINFO pi, &xvco, mnp)) {
			unsigned int idx;
			unsigned int vco;
			unsigned int delta;

			vco = g450_mnp2vco(PMINFO mnp);
#if 0			
			if (pll == M_VIDEO_PLL) {
				unsigned int big, small;

				if (vco < pixel_vco) {
					small = vco;
					big = pixel_vco;
				} else {
					small = pixel_vco;
					big = vco;
				}
				while (big > small) {
					big >>= 1;
				}
				if (big == small) {
					continue;
				}
			}
#endif			
			delta = pll_freq_delta(fout, g450_vco2f(mnp, vco));
			for (idx = mnpcount; idx > 0; idx--) {
				/* == is important; due to nextpll algorithm we get
				   sorted equally good frequencies from lower VCO 
				   frequency to higher - with <= lowest wins, while
				   with < highest one wins */
				if (delta <= deltaarray[idx-1]) {
					/* all else being equal except VCO,
					 * choose VCO not near (within 1/16th or so) VCOmin
					 * (freqs near VCOmin aren't as stable)
					 */
					if (delta == deltaarray[idx-1]
					    && vco != g450_mnp2vco(PMINFO mnparray[idx-1])
					    && vco < (pi->vcomin * 17 / 16)) {
						break;
					}
					mnparray[idx] = mnparray[idx-1];
					deltaarray[idx] = deltaarray[idx-1];
				} else {
					break;
				}
			}
			mnparray[idx] = mnp;
			deltaarray[idx] = delta;
			mnpcount++;
		}
	}
	/* VideoPLL and PixelPLL matched: do nothing... In all other cases we should get at least one frequency */
	if (!mnpcount) {
		return -EBUSY;
	}
	{
		unsigned long flags;
		unsigned int mnp;
		
		matroxfb_DAC_lock_irqsave(flags);
		mnp = g450_checkcache(PMINFO ci, mnparray[0]);
		if (mnp != NO_MORE_MNP) {
			matroxfb_g450_setpll_cond(PMINFO mnp, pll);
		} else {
			mnp = g450_findworkingpll(PMINFO pll, mnparray, mnpcount);
			g450_addcache(ci, mnparray[0], mnp);
		}
		updatehwstate_clk(&ACCESS_FBINFO(hw), mnp, pll);
		matroxfb_DAC_unlock_irqrestore(flags);
		return mnp;
	}
}

/* It must be greater than number of possible PLL values.
 * Currently there is 5(p) * 10(m) = 50 possible values. */
#define MNP_TABLE_SIZE  64

int matroxfb_g450_setclk(WPMINFO unsigned int fout, unsigned int pll) {
	unsigned int* arr;
	
	arr = kmalloc(sizeof(*arr) * MNP_TABLE_SIZE * 2, GFP_KERNEL);
	if (arr) {
		int r;

		r = __g450_setclk(PMINFO fout, pll, arr, arr + MNP_TABLE_SIZE);
		kfree(arr);
		return r;
	}
	return -ENOMEM;
}

EXPORT_SYMBOL(matroxfb_g450_setclk);
EXPORT_SYMBOL(g450_mnp2f);
EXPORT_SYMBOL(matroxfb_g450_setpll_cond);

MODULE_AUTHOR("(c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Matrox G450/G550 PLL driver");

MODULE_LICENSE("GPL");