1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2010 Matt Turner.
4  * Copyright 2012 Red Hat
5  *
6  * Authors: Matthew Garrett
7  *	    Matt Turner
8  *	    Dave Airlie
9  */
10 
11 #include <linux/delay.h>
12 #include <linux/dma-buf-map.h>
13 
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_atomic_state_helper.h>
16 #include <drm/drm_crtc_helper.h>
17 #include <drm/drm_damage_helper.h>
18 #include <drm/drm_format_helper.h>
19 #include <drm/drm_fourcc.h>
20 #include <drm/drm_gem_atomic_helper.h>
21 #include <drm/drm_gem_framebuffer_helper.h>
22 #include <drm/drm_plane_helper.h>
23 #include <drm/drm_print.h>
24 #include <drm/drm_probe_helper.h>
25 #include <drm/drm_simple_kms_helper.h>
26 
27 #include "mgag200_drv.h"
28 
29 #define MGAG200_LUT_SIZE 256
30 
31 /*
32  * This file contains setup code for the CRTC.
33  */
34 
35 static void mga_crtc_load_lut(struct drm_crtc *crtc)
36 {
37 	struct drm_device *dev = crtc->dev;
38 	struct mga_device *mdev = to_mga_device(dev);
39 	struct drm_framebuffer *fb;
40 	u16 *r_ptr, *g_ptr, *b_ptr;
41 	int i;
42 
43 	if (!crtc->enabled)
44 		return;
45 
46 	if (!mdev->display_pipe.plane.state)
47 		return;
48 
49 	fb = mdev->display_pipe.plane.state->fb;
50 
51 	r_ptr = crtc->gamma_store;
52 	g_ptr = r_ptr + crtc->gamma_size;
53 	b_ptr = g_ptr + crtc->gamma_size;
54 
55 	WREG8(DAC_INDEX + MGA1064_INDEX, 0);
56 
57 	if (fb && fb->format->cpp[0] * 8 == 16) {
58 		int inc = (fb->format->depth == 15) ? 8 : 4;
59 		u8 r, b;
60 		for (i = 0; i < MGAG200_LUT_SIZE; i += inc) {
61 			if (fb->format->depth == 16) {
62 				if (i > (MGAG200_LUT_SIZE >> 1)) {
63 					r = b = 0;
64 				} else {
65 					r = *r_ptr++ >> 8;
66 					b = *b_ptr++ >> 8;
67 					r_ptr++;
68 					b_ptr++;
69 				}
70 			} else {
71 				r = *r_ptr++ >> 8;
72 				b = *b_ptr++ >> 8;
73 			}
74 			/* VGA registers */
75 			WREG8(DAC_INDEX + MGA1064_COL_PAL, r);
76 			WREG8(DAC_INDEX + MGA1064_COL_PAL, *g_ptr++ >> 8);
77 			WREG8(DAC_INDEX + MGA1064_COL_PAL, b);
78 		}
79 		return;
80 	}
81 	for (i = 0; i < MGAG200_LUT_SIZE; i++) {
82 		/* VGA registers */
83 		WREG8(DAC_INDEX + MGA1064_COL_PAL, *r_ptr++ >> 8);
84 		WREG8(DAC_INDEX + MGA1064_COL_PAL, *g_ptr++ >> 8);
85 		WREG8(DAC_INDEX + MGA1064_COL_PAL, *b_ptr++ >> 8);
86 	}
87 }
88 
89 static inline void mga_wait_vsync(struct mga_device *mdev)
90 {
91 	unsigned long timeout = jiffies + HZ/10;
92 	unsigned int status = 0;
93 
94 	do {
95 		status = RREG32(MGAREG_Status);
96 	} while ((status & 0x08) && time_before(jiffies, timeout));
97 	timeout = jiffies + HZ/10;
98 	status = 0;
99 	do {
100 		status = RREG32(MGAREG_Status);
101 	} while (!(status & 0x08) && time_before(jiffies, timeout));
102 }
103 
104 static inline void mga_wait_busy(struct mga_device *mdev)
105 {
106 	unsigned long timeout = jiffies + HZ;
107 	unsigned int status = 0;
108 	do {
109 		status = RREG8(MGAREG_Status + 2);
110 	} while ((status & 0x01) && time_before(jiffies, timeout));
111 }
112 
113 /*
114  * PLL setup
115  */
116 
117 static int mgag200_g200_set_plls(struct mga_device *mdev, long clock)
118 {
119 	struct drm_device *dev = &mdev->base;
120 	const int post_div_max = 7;
121 	const int in_div_min = 1;
122 	const int in_div_max = 6;
123 	const int feed_div_min = 7;
124 	const int feed_div_max = 127;
125 	u8 testm, testn;
126 	u8 n = 0, m = 0, p, s;
127 	long f_vco;
128 	long computed;
129 	long delta, tmp_delta;
130 	long ref_clk = mdev->model.g200.ref_clk;
131 	long p_clk_min = mdev->model.g200.pclk_min;
132 	long p_clk_max =  mdev->model.g200.pclk_max;
133 
134 	if (clock > p_clk_max) {
135 		drm_err(dev, "Pixel Clock %ld too high\n", clock);
136 		return 1;
137 	}
138 
139 	if (clock < p_clk_min >> 3)
140 		clock = p_clk_min >> 3;
141 
142 	f_vco = clock;
143 	for (p = 0;
144 	     p <= post_div_max && f_vco < p_clk_min;
145 	     p = (p << 1) + 1, f_vco <<= 1)
146 		;
147 
148 	delta = clock;
149 
150 	for (testm = in_div_min; testm <= in_div_max; testm++) {
151 		for (testn = feed_div_min; testn <= feed_div_max; testn++) {
152 			computed = ref_clk * (testn + 1) / (testm + 1);
153 			if (computed < f_vco)
154 				tmp_delta = f_vco - computed;
155 			else
156 				tmp_delta = computed - f_vco;
157 			if (tmp_delta < delta) {
158 				delta = tmp_delta;
159 				m = testm;
160 				n = testn;
161 			}
162 		}
163 	}
164 	f_vco = ref_clk * (n + 1) / (m + 1);
165 	if (f_vco < 100000)
166 		s = 0;
167 	else if (f_vco < 140000)
168 		s = 1;
169 	else if (f_vco < 180000)
170 		s = 2;
171 	else
172 		s = 3;
173 
174 	drm_dbg_kms(dev, "clock: %ld vco: %ld m: %d n: %d p: %d s: %d\n",
175 		    clock, f_vco, m, n, p, s);
176 
177 	WREG_DAC(MGA1064_PIX_PLLC_M, m);
178 	WREG_DAC(MGA1064_PIX_PLLC_N, n);
179 	WREG_DAC(MGA1064_PIX_PLLC_P, (p | (s << 3)));
180 
181 	return 0;
182 }
183 
184 #define P_ARRAY_SIZE 9
185 
186 static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
187 {
188 	u32 unique_rev_id = mdev->model.g200se.unique_rev_id;
189 	unsigned int vcomax, vcomin, pllreffreq;
190 	unsigned int delta, tmpdelta, permitteddelta;
191 	unsigned int testp, testm, testn;
192 	unsigned int p, m, n;
193 	unsigned int computed;
194 	unsigned int pvalues_e4[P_ARRAY_SIZE] = {16, 14, 12, 10, 8, 6, 4, 2, 1};
195 	unsigned int fvv;
196 	unsigned int i;
197 
198 	if (unique_rev_id <= 0x03) {
199 
200 		m = n = p = 0;
201 		vcomax = 320000;
202 		vcomin = 160000;
203 		pllreffreq = 25000;
204 
205 		delta = 0xffffffff;
206 		permitteddelta = clock * 5 / 1000;
207 
208 		for (testp = 8; testp > 0; testp /= 2) {
209 			if (clock * testp > vcomax)
210 				continue;
211 			if (clock * testp < vcomin)
212 				continue;
213 
214 			for (testn = 17; testn < 256; testn++) {
215 				for (testm = 1; testm < 32; testm++) {
216 					computed = (pllreffreq * testn) /
217 						(testm * testp);
218 					if (computed > clock)
219 						tmpdelta = computed - clock;
220 					else
221 						tmpdelta = clock - computed;
222 					if (tmpdelta < delta) {
223 						delta = tmpdelta;
224 						m = testm - 1;
225 						n = testn - 1;
226 						p = testp - 1;
227 					}
228 				}
229 			}
230 		}
231 	} else {
232 
233 
234 		m = n = p = 0;
235 		vcomax        = 1600000;
236 		vcomin        = 800000;
237 		pllreffreq    = 25000;
238 
239 		if (clock < 25000)
240 			clock = 25000;
241 
242 		clock = clock * 2;
243 
244 		delta = 0xFFFFFFFF;
245 		/* Permited delta is 0.5% as VESA Specification */
246 		permitteddelta = clock * 5 / 1000;
247 
248 		for (i = 0 ; i < P_ARRAY_SIZE ; i++) {
249 			testp = pvalues_e4[i];
250 
251 			if ((clock * testp) > vcomax)
252 				continue;
253 			if ((clock * testp) < vcomin)
254 				continue;
255 
256 			for (testn = 50; testn <= 256; testn++) {
257 				for (testm = 1; testm <= 32; testm++) {
258 					computed = (pllreffreq * testn) /
259 						(testm * testp);
260 					if (computed > clock)
261 						tmpdelta = computed - clock;
262 					else
263 						tmpdelta = clock - computed;
264 
265 					if (tmpdelta < delta) {
266 						delta = tmpdelta;
267 						m = testm - 1;
268 						n = testn - 1;
269 						p = testp - 1;
270 					}
271 				}
272 			}
273 		}
274 
275 		fvv = pllreffreq * (n + 1) / (m + 1);
276 		fvv = (fvv - 800000) / 50000;
277 
278 		if (fvv > 15)
279 			fvv = 15;
280 
281 		p |= (fvv << 4);
282 		m |= 0x80;
283 
284 		clock = clock / 2;
285 	}
286 
287 	if (delta > permitteddelta) {
288 		pr_warn("PLL delta too large\n");
289 		return 1;
290 	}
291 
292 	WREG_DAC(MGA1064_PIX_PLLC_M, m);
293 	WREG_DAC(MGA1064_PIX_PLLC_N, n);
294 	WREG_DAC(MGA1064_PIX_PLLC_P, p);
295 
296 	if (unique_rev_id >= 0x04) {
297 		WREG_DAC(0x1a, 0x09);
298 		msleep(20);
299 		WREG_DAC(0x1a, 0x01);
300 
301 	}
302 
303 	return 0;
304 }
305 
306 static int mga_g200wb_set_plls(struct mga_device *mdev, long clock)
307 {
308 	unsigned int vcomax, vcomin, pllreffreq;
309 	unsigned int delta, tmpdelta;
310 	unsigned int testp, testm, testn, testp2;
311 	unsigned int p, m, n;
312 	unsigned int computed;
313 	int i, j, tmpcount, vcount;
314 	bool pll_locked = false;
315 	u8 tmp;
316 
317 	m = n = p = 0;
318 
319 	delta = 0xffffffff;
320 
321 	if (mdev->type == G200_EW3) {
322 
323 		vcomax = 800000;
324 		vcomin = 400000;
325 		pllreffreq = 25000;
326 
327 		for (testp = 1; testp < 8; testp++) {
328 			for (testp2 = 1; testp2 < 8; testp2++) {
329 				if (testp < testp2)
330 					continue;
331 				if ((clock * testp * testp2) > vcomax)
332 					continue;
333 				if ((clock * testp * testp2) < vcomin)
334 					continue;
335 				for (testm = 1; testm < 26; testm++) {
336 					for (testn = 32; testn < 2048 ; testn++) {
337 						computed = (pllreffreq * testn) /
338 							(testm * testp * testp2);
339 						if (computed > clock)
340 							tmpdelta = computed - clock;
341 						else
342 							tmpdelta = clock - computed;
343 						if (tmpdelta < delta) {
344 							delta = tmpdelta;
345 							m = ((testn & 0x100) >> 1) |
346 								(testm);
347 							n = (testn & 0xFF);
348 							p = ((testn & 0x600) >> 3) |
349 								(testp2 << 3) |
350 								(testp);
351 						}
352 					}
353 				}
354 			}
355 		}
356 	} else {
357 
358 		vcomax = 550000;
359 		vcomin = 150000;
360 		pllreffreq = 48000;
361 
362 		for (testp = 1; testp < 9; testp++) {
363 			if (clock * testp > vcomax)
364 				continue;
365 			if (clock * testp < vcomin)
366 				continue;
367 
368 			for (testm = 1; testm < 17; testm++) {
369 				for (testn = 1; testn < 151; testn++) {
370 					computed = (pllreffreq * testn) /
371 						(testm * testp);
372 					if (computed > clock)
373 						tmpdelta = computed - clock;
374 					else
375 						tmpdelta = clock - computed;
376 					if (tmpdelta < delta) {
377 						delta = tmpdelta;
378 						n = testn - 1;
379 						m = (testm - 1) |
380 							((n >> 1) & 0x80);
381 						p = testp - 1;
382 					}
383 				}
384 			}
385 		}
386 	}
387 
388 	for (i = 0; i <= 32 && pll_locked == false; i++) {
389 		if (i > 0) {
390 			WREG8(MGAREG_CRTC_INDEX, 0x1e);
391 			tmp = RREG8(MGAREG_CRTC_DATA);
392 			if (tmp < 0xff)
393 				WREG8(MGAREG_CRTC_DATA, tmp+1);
394 		}
395 
396 		/* set pixclkdis to 1 */
397 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
398 		tmp = RREG8(DAC_DATA);
399 		tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
400 		WREG8(DAC_DATA, tmp);
401 
402 		WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
403 		tmp = RREG8(DAC_DATA);
404 		tmp |= MGA1064_REMHEADCTL_CLKDIS;
405 		WREG8(DAC_DATA, tmp);
406 
407 		/* select PLL Set C */
408 		tmp = RREG8(MGAREG_MEM_MISC_READ);
409 		tmp |= 0x3 << 2;
410 		WREG8(MGAREG_MEM_MISC_WRITE, tmp);
411 
412 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
413 		tmp = RREG8(DAC_DATA);
414 		tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN | 0x80;
415 		WREG8(DAC_DATA, tmp);
416 
417 		udelay(500);
418 
419 		/* reset the PLL */
420 		WREG8(DAC_INDEX, MGA1064_VREF_CTL);
421 		tmp = RREG8(DAC_DATA);
422 		tmp &= ~0x04;
423 		WREG8(DAC_DATA, tmp);
424 
425 		udelay(50);
426 
427 		/* program pixel pll register */
428 		WREG_DAC(MGA1064_WB_PIX_PLLC_N, n);
429 		WREG_DAC(MGA1064_WB_PIX_PLLC_M, m);
430 		WREG_DAC(MGA1064_WB_PIX_PLLC_P, p);
431 
432 		udelay(50);
433 
434 		/* turn pll on */
435 		WREG8(DAC_INDEX, MGA1064_VREF_CTL);
436 		tmp = RREG8(DAC_DATA);
437 		tmp |= 0x04;
438 		WREG_DAC(MGA1064_VREF_CTL, tmp);
439 
440 		udelay(500);
441 
442 		/* select the pixel pll */
443 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
444 		tmp = RREG8(DAC_DATA);
445 		tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
446 		tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
447 		WREG8(DAC_DATA, tmp);
448 
449 		WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
450 		tmp = RREG8(DAC_DATA);
451 		tmp &= ~MGA1064_REMHEADCTL_CLKSL_MSK;
452 		tmp |= MGA1064_REMHEADCTL_CLKSL_PLL;
453 		WREG8(DAC_DATA, tmp);
454 
455 		/* reset dotclock rate bit */
456 		WREG8(MGAREG_SEQ_INDEX, 1);
457 		tmp = RREG8(MGAREG_SEQ_DATA);
458 		tmp &= ~0x8;
459 		WREG8(MGAREG_SEQ_DATA, tmp);
460 
461 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
462 		tmp = RREG8(DAC_DATA);
463 		tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
464 		WREG8(DAC_DATA, tmp);
465 
466 		vcount = RREG8(MGAREG_VCOUNT);
467 
468 		for (j = 0; j < 30 && pll_locked == false; j++) {
469 			tmpcount = RREG8(MGAREG_VCOUNT);
470 			if (tmpcount < vcount)
471 				vcount = 0;
472 			if ((tmpcount - vcount) > 2)
473 				pll_locked = true;
474 			else
475 				udelay(5);
476 		}
477 	}
478 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
479 	tmp = RREG8(DAC_DATA);
480 	tmp &= ~MGA1064_REMHEADCTL_CLKDIS;
481 	WREG_DAC(MGA1064_REMHEADCTL, tmp);
482 	return 0;
483 }
484 
485 static int mga_g200ev_set_plls(struct mga_device *mdev, long clock)
486 {
487 	unsigned int vcomax, vcomin, pllreffreq;
488 	unsigned int delta, tmpdelta;
489 	unsigned int testp, testm, testn;
490 	unsigned int p, m, n;
491 	unsigned int computed;
492 	u8 tmp;
493 
494 	m = n = p = 0;
495 	vcomax = 550000;
496 	vcomin = 150000;
497 	pllreffreq = 50000;
498 
499 	delta = 0xffffffff;
500 
501 	for (testp = 16; testp > 0; testp--) {
502 		if (clock * testp > vcomax)
503 			continue;
504 		if (clock * testp < vcomin)
505 			continue;
506 
507 		for (testn = 1; testn < 257; testn++) {
508 			for (testm = 1; testm < 17; testm++) {
509 				computed = (pllreffreq * testn) /
510 					(testm * testp);
511 				if (computed > clock)
512 					tmpdelta = computed - clock;
513 				else
514 					tmpdelta = clock - computed;
515 				if (tmpdelta < delta) {
516 					delta = tmpdelta;
517 					n = testn - 1;
518 					m = testm - 1;
519 					p = testp - 1;
520 				}
521 			}
522 		}
523 	}
524 
525 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
526 	tmp = RREG8(DAC_DATA);
527 	tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
528 	WREG8(DAC_DATA, tmp);
529 
530 	tmp = RREG8(MGAREG_MEM_MISC_READ);
531 	tmp |= 0x3 << 2;
532 	WREG8(MGAREG_MEM_MISC_WRITE, tmp);
533 
534 	WREG8(DAC_INDEX, MGA1064_PIX_PLL_STAT);
535 	tmp = RREG8(DAC_DATA);
536 	WREG8(DAC_DATA, tmp & ~0x40);
537 
538 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
539 	tmp = RREG8(DAC_DATA);
540 	tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
541 	WREG8(DAC_DATA, tmp);
542 
543 	WREG_DAC(MGA1064_EV_PIX_PLLC_M, m);
544 	WREG_DAC(MGA1064_EV_PIX_PLLC_N, n);
545 	WREG_DAC(MGA1064_EV_PIX_PLLC_P, p);
546 
547 	udelay(50);
548 
549 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
550 	tmp = RREG8(DAC_DATA);
551 	tmp &= ~MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
552 	WREG8(DAC_DATA, tmp);
553 
554 	udelay(500);
555 
556 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
557 	tmp = RREG8(DAC_DATA);
558 	tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
559 	tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
560 	WREG8(DAC_DATA, tmp);
561 
562 	WREG8(DAC_INDEX, MGA1064_PIX_PLL_STAT);
563 	tmp = RREG8(DAC_DATA);
564 	WREG8(DAC_DATA, tmp | 0x40);
565 
566 	tmp = RREG8(MGAREG_MEM_MISC_READ);
567 	tmp |= (0x3 << 2);
568 	WREG8(MGAREG_MEM_MISC_WRITE, tmp);
569 
570 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
571 	tmp = RREG8(DAC_DATA);
572 	tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
573 	WREG8(DAC_DATA, tmp);
574 
575 	return 0;
576 }
577 
578 static int mga_g200eh_set_plls(struct mga_device *mdev, long clock)
579 {
580 	unsigned int vcomax, vcomin, pllreffreq;
581 	unsigned int delta, tmpdelta;
582 	unsigned int testp, testm, testn;
583 	unsigned int p, m, n;
584 	unsigned int computed;
585 	int i, j, tmpcount, vcount;
586 	u8 tmp;
587 	bool pll_locked = false;
588 
589 	m = n = p = 0;
590 
591 	if (mdev->type == G200_EH3) {
592 		vcomax = 3000000;
593 		vcomin = 1500000;
594 		pllreffreq = 25000;
595 
596 		delta = 0xffffffff;
597 
598 		testp = 0;
599 
600 		for (testm = 150; testm >= 6; testm--) {
601 			if (clock * testm > vcomax)
602 				continue;
603 			if (clock * testm < vcomin)
604 				continue;
605 			for (testn = 120; testn >= 60; testn--) {
606 				computed = (pllreffreq * testn) / testm;
607 				if (computed > clock)
608 					tmpdelta = computed - clock;
609 				else
610 					tmpdelta = clock - computed;
611 				if (tmpdelta < delta) {
612 					delta = tmpdelta;
613 					n = testn;
614 					m = testm;
615 					p = testp;
616 				}
617 				if (delta == 0)
618 					break;
619 			}
620 			if (delta == 0)
621 				break;
622 		}
623 	} else {
624 
625 		vcomax = 800000;
626 		vcomin = 400000;
627 		pllreffreq = 33333;
628 
629 		delta = 0xffffffff;
630 
631 		for (testp = 16; testp > 0; testp >>= 1) {
632 			if (clock * testp > vcomax)
633 				continue;
634 			if (clock * testp < vcomin)
635 				continue;
636 
637 			for (testm = 1; testm < 33; testm++) {
638 				for (testn = 17; testn < 257; testn++) {
639 					computed = (pllreffreq * testn) /
640 						(testm * testp);
641 					if (computed > clock)
642 						tmpdelta = computed - clock;
643 					else
644 						tmpdelta = clock - computed;
645 					if (tmpdelta < delta) {
646 						delta = tmpdelta;
647 						n = testn - 1;
648 						m = (testm - 1);
649 						p = testp - 1;
650 					}
651 					if ((clock * testp) >= 600000)
652 						p |= 0x80;
653 				}
654 			}
655 		}
656 	}
657 	for (i = 0; i <= 32 && pll_locked == false; i++) {
658 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
659 		tmp = RREG8(DAC_DATA);
660 		tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
661 		WREG8(DAC_DATA, tmp);
662 
663 		tmp = RREG8(MGAREG_MEM_MISC_READ);
664 		tmp |= 0x3 << 2;
665 		WREG8(MGAREG_MEM_MISC_WRITE, tmp);
666 
667 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
668 		tmp = RREG8(DAC_DATA);
669 		tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
670 		WREG8(DAC_DATA, tmp);
671 
672 		udelay(500);
673 
674 		WREG_DAC(MGA1064_EH_PIX_PLLC_M, m);
675 		WREG_DAC(MGA1064_EH_PIX_PLLC_N, n);
676 		WREG_DAC(MGA1064_EH_PIX_PLLC_P, p);
677 
678 		udelay(500);
679 
680 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
681 		tmp = RREG8(DAC_DATA);
682 		tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
683 		tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
684 		WREG8(DAC_DATA, tmp);
685 
686 		WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
687 		tmp = RREG8(DAC_DATA);
688 		tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
689 		tmp &= ~MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
690 		WREG8(DAC_DATA, tmp);
691 
692 		vcount = RREG8(MGAREG_VCOUNT);
693 
694 		for (j = 0; j < 30 && pll_locked == false; j++) {
695 			tmpcount = RREG8(MGAREG_VCOUNT);
696 			if (tmpcount < vcount)
697 				vcount = 0;
698 			if ((tmpcount - vcount) > 2)
699 				pll_locked = true;
700 			else
701 				udelay(5);
702 		}
703 	}
704 
705 	return 0;
706 }
707 
708 static int mga_g200er_set_plls(struct mga_device *mdev, long clock)
709 {
710 	static const unsigned int m_div_val[] = { 1, 2, 4, 8 };
711 	unsigned int vcomax, vcomin, pllreffreq;
712 	unsigned int delta, tmpdelta;
713 	int testr, testn, testm, testo;
714 	unsigned int p, m, n;
715 	unsigned int computed, vco;
716 	int tmp;
717 
718 	m = n = p = 0;
719 	vcomax = 1488000;
720 	vcomin = 1056000;
721 	pllreffreq = 48000;
722 
723 	delta = 0xffffffff;
724 
725 	for (testr = 0; testr < 4; testr++) {
726 		if (delta == 0)
727 			break;
728 		for (testn = 5; testn < 129; testn++) {
729 			if (delta == 0)
730 				break;
731 			for (testm = 3; testm >= 0; testm--) {
732 				if (delta == 0)
733 					break;
734 				for (testo = 5; testo < 33; testo++) {
735 					vco = pllreffreq * (testn + 1) /
736 						(testr + 1);
737 					if (vco < vcomin)
738 						continue;
739 					if (vco > vcomax)
740 						continue;
741 					computed = vco / (m_div_val[testm] * (testo + 1));
742 					if (computed > clock)
743 						tmpdelta = computed - clock;
744 					else
745 						tmpdelta = clock - computed;
746 					if (tmpdelta < delta) {
747 						delta = tmpdelta;
748 						m = testm | (testo << 3);
749 						n = testn;
750 						p = testr | (testr << 3);
751 					}
752 				}
753 			}
754 		}
755 	}
756 
757 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
758 	tmp = RREG8(DAC_DATA);
759 	tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
760 	WREG8(DAC_DATA, tmp);
761 
762 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
763 	tmp = RREG8(DAC_DATA);
764 	tmp |= MGA1064_REMHEADCTL_CLKDIS;
765 	WREG8(DAC_DATA, tmp);
766 
767 	tmp = RREG8(MGAREG_MEM_MISC_READ);
768 	tmp |= (0x3<<2) | 0xc0;
769 	WREG8(MGAREG_MEM_MISC_WRITE, tmp);
770 
771 	WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
772 	tmp = RREG8(DAC_DATA);
773 	tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
774 	tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
775 	WREG8(DAC_DATA, tmp);
776 
777 	udelay(500);
778 
779 	WREG_DAC(MGA1064_ER_PIX_PLLC_N, n);
780 	WREG_DAC(MGA1064_ER_PIX_PLLC_M, m);
781 	WREG_DAC(MGA1064_ER_PIX_PLLC_P, p);
782 
783 	udelay(50);
784 
785 	return 0;
786 }
787 
788 static int mgag200_crtc_set_plls(struct mga_device *mdev, long clock)
789 {
790 	u8 misc;
791 
792 	switch(mdev->type) {
793 	case G200_PCI:
794 	case G200_AGP:
795 		return mgag200_g200_set_plls(mdev, clock);
796 	case G200_SE_A:
797 	case G200_SE_B:
798 		return mga_g200se_set_plls(mdev, clock);
799 	case G200_WB:
800 	case G200_EW3:
801 		return mga_g200wb_set_plls(mdev, clock);
802 	case G200_EV:
803 		return mga_g200ev_set_plls(mdev, clock);
804 	case G200_EH:
805 	case G200_EH3:
806 		return mga_g200eh_set_plls(mdev, clock);
807 	case G200_ER:
808 		return mga_g200er_set_plls(mdev, clock);
809 	}
810 
811 	misc = RREG8(MGA_MISC_IN);
812 	misc &= ~MGAREG_MISC_CLK_SEL_MASK;
813 	misc |= MGAREG_MISC_CLK_SEL_MGA_MSK;
814 	WREG8(MGA_MISC_OUT, misc);
815 
816 	return 0;
817 }
818 
819 static void mgag200_g200wb_hold_bmc(struct mga_device *mdev)
820 {
821 	u8 tmp;
822 	int iter_max;
823 
824 	/* 1- The first step is to warn the BMC of an upcoming mode change.
825 	 * We are putting the misc<0> to output.*/
826 
827 	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
828 	tmp = RREG8(DAC_DATA);
829 	tmp |= 0x10;
830 	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
831 
832 	/* we are putting a 1 on the misc<0> line */
833 	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
834 	tmp = RREG8(DAC_DATA);
835 	tmp |= 0x10;
836 	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
837 
838 	/* 2- Second step to mask and further scan request
839 	 * This will be done by asserting the remfreqmsk bit (XSPAREREG<7>)
840 	 */
841 	WREG8(DAC_INDEX, MGA1064_SPAREREG);
842 	tmp = RREG8(DAC_DATA);
843 	tmp |= 0x80;
844 	WREG_DAC(MGA1064_SPAREREG, tmp);
845 
846 	/* 3a- the third step is to verifu if there is an active scan
847 	 * We are searching for a 0 on remhsyncsts <XSPAREREG<0>)
848 	 */
849 	iter_max = 300;
850 	while (!(tmp & 0x1) && iter_max) {
851 		WREG8(DAC_INDEX, MGA1064_SPAREREG);
852 		tmp = RREG8(DAC_DATA);
853 		udelay(1000);
854 		iter_max--;
855 	}
856 
857 	/* 3b- this step occurs only if the remove is actually scanning
858 	 * we are waiting for the end of the frame which is a 1 on
859 	 * remvsyncsts (XSPAREREG<1>)
860 	 */
861 	if (iter_max) {
862 		iter_max = 300;
863 		while ((tmp & 0x2) && iter_max) {
864 			WREG8(DAC_INDEX, MGA1064_SPAREREG);
865 			tmp = RREG8(DAC_DATA);
866 			udelay(1000);
867 			iter_max--;
868 		}
869 	}
870 }
871 
872 static void mgag200_g200wb_release_bmc(struct mga_device *mdev)
873 {
874 	u8 tmp;
875 
876 	/* 1- The first step is to ensure that the vrsten and hrsten are set */
877 	WREG8(MGAREG_CRTCEXT_INDEX, 1);
878 	tmp = RREG8(MGAREG_CRTCEXT_DATA);
879 	WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
880 
881 	/* 2- second step is to assert the rstlvl2 */
882 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
883 	tmp = RREG8(DAC_DATA);
884 	tmp |= 0x8;
885 	WREG8(DAC_DATA, tmp);
886 
887 	/* wait 10 us */
888 	udelay(10);
889 
890 	/* 3- deassert rstlvl2 */
891 	tmp &= ~0x08;
892 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
893 	WREG8(DAC_DATA, tmp);
894 
895 	/* 4- remove mask of scan request */
896 	WREG8(DAC_INDEX, MGA1064_SPAREREG);
897 	tmp = RREG8(DAC_DATA);
898 	tmp &= ~0x80;
899 	WREG8(DAC_DATA, tmp);
900 
901 	/* 5- put back a 0 on the misc<0> line */
902 	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
903 	tmp = RREG8(DAC_DATA);
904 	tmp &= ~0x10;
905 	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
906 }
907 
908 /*
909  * This is how the framebuffer base address is stored in g200 cards:
910  *   * Assume @offset is the gpu_addr variable of the framebuffer object
911  *   * Then addr is the number of _pixels_ (not bytes) from the start of
912  *     VRAM to the first pixel we want to display. (divided by 2 for 32bit
913  *     framebuffers)
914  *   * addr is stored in the CRTCEXT0, CRTCC and CRTCD registers
915  *      addr<20> -> CRTCEXT0<6>
916  *      addr<19-16> -> CRTCEXT0<3-0>
917  *      addr<15-8> -> CRTCC<7-0>
918  *      addr<7-0> -> CRTCD<7-0>
919  *
920  *  CRTCEXT0 has to be programmed last to trigger an update and make the
921  *  new addr variable take effect.
922  */
923 static void mgag200_set_startadd(struct mga_device *mdev,
924 				 unsigned long offset)
925 {
926 	struct drm_device *dev = &mdev->base;
927 	u32 startadd;
928 	u8 crtcc, crtcd, crtcext0;
929 
930 	startadd = offset / 8;
931 
932 	/*
933 	 * Can't store addresses any higher than that, but we also
934 	 * don't have more than 16 MiB of memory, so it should be fine.
935 	 */
936 	drm_WARN_ON(dev, startadd > 0x1fffff);
937 
938 	RREG_ECRT(0x00, crtcext0);
939 
940 	crtcc = (startadd >> 8) & 0xff;
941 	crtcd = startadd & 0xff;
942 	crtcext0 &= 0xb0;
943 	crtcext0 |= ((startadd >> 14) & BIT(6)) |
944 		    ((startadd >> 16) & 0x0f);
945 
946 	WREG_CRT(0x0c, crtcc);
947 	WREG_CRT(0x0d, crtcd);
948 	WREG_ECRT(0x00, crtcext0);
949 }
950 
951 static void mgag200_set_dac_regs(struct mga_device *mdev)
952 {
953 	size_t i;
954 	u8 dacvalue[] = {
955 		/* 0x00: */        0,    0,    0,    0,    0,    0, 0x00,    0,
956 		/* 0x08: */        0,    0,    0,    0,    0,    0,    0,    0,
957 		/* 0x10: */        0,    0,    0,    0,    0,    0,    0,    0,
958 		/* 0x18: */     0x00,    0, 0xC9, 0xFF, 0xBF, 0x20, 0x1F, 0x20,
959 		/* 0x20: */     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
960 		/* 0x28: */     0x00, 0x00, 0x00, 0x00,    0,    0,    0, 0x40,
961 		/* 0x30: */     0x00, 0xB0, 0x00, 0xC2, 0x34, 0x14, 0x02, 0x83,
962 		/* 0x38: */     0x00, 0x93, 0x00, 0x77, 0x00, 0x00, 0x00, 0x3A,
963 		/* 0x40: */        0,    0,    0,    0,    0,    0,    0,    0,
964 		/* 0x48: */        0,    0,    0,    0,    0,    0,    0,    0
965 	};
966 
967 	switch (mdev->type) {
968 	case G200_PCI:
969 	case G200_AGP:
970 		dacvalue[MGA1064_SYS_PLL_M] = 0x04;
971 		dacvalue[MGA1064_SYS_PLL_N] = 0x2D;
972 		dacvalue[MGA1064_SYS_PLL_P] = 0x19;
973 		break;
974 	case G200_SE_A:
975 	case G200_SE_B:
976 		dacvalue[MGA1064_VREF_CTL] = 0x03;
977 		dacvalue[MGA1064_PIX_CLK_CTL] = MGA1064_PIX_CLK_CTL_SEL_PLL;
978 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_DAC_EN |
979 					     MGA1064_MISC_CTL_VGA8 |
980 					     MGA1064_MISC_CTL_DAC_RAM_CS;
981 		break;
982 	case G200_WB:
983 	case G200_EW3:
984 		dacvalue[MGA1064_VREF_CTL] = 0x07;
985 		break;
986 	case G200_EV:
987 		dacvalue[MGA1064_PIX_CLK_CTL] = MGA1064_PIX_CLK_CTL_SEL_PLL;
988 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_VGA8 |
989 					     MGA1064_MISC_CTL_DAC_RAM_CS;
990 		break;
991 	case G200_EH:
992 	case G200_EH3:
993 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_VGA8 |
994 					     MGA1064_MISC_CTL_DAC_RAM_CS;
995 		break;
996 	case G200_ER:
997 		break;
998 	}
999 
1000 	for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
1001 		if ((i <= 0x17) ||
1002 		    (i == 0x1b) ||
1003 		    (i == 0x1c) ||
1004 		    ((i >= 0x1f) && (i <= 0x29)) ||
1005 		    ((i >= 0x30) && (i <= 0x37)))
1006 			continue;
1007 		if (IS_G200_SE(mdev) &&
1008 		    ((i == 0x2c) || (i == 0x2d) || (i == 0x2e)))
1009 			continue;
1010 		if ((mdev->type == G200_EV ||
1011 		    mdev->type == G200_WB ||
1012 		    mdev->type == G200_EH ||
1013 		    mdev->type == G200_EW3 ||
1014 		    mdev->type == G200_EH3) &&
1015 		    (i >= 0x44) && (i <= 0x4e))
1016 			continue;
1017 
1018 		WREG_DAC(i, dacvalue[i]);
1019 	}
1020 
1021 	if (mdev->type == G200_ER)
1022 		WREG_DAC(0x90, 0);
1023 }
1024 
1025 static void mgag200_init_regs(struct mga_device *mdev)
1026 {
1027 	u8 crtc11, misc;
1028 
1029 	mgag200_set_dac_regs(mdev);
1030 
1031 	WREG_SEQ(2, 0x0f);
1032 	WREG_SEQ(3, 0x00);
1033 	WREG_SEQ(4, 0x0e);
1034 
1035 	WREG_CRT(10, 0);
1036 	WREG_CRT(11, 0);
1037 	WREG_CRT(12, 0);
1038 	WREG_CRT(13, 0);
1039 	WREG_CRT(14, 0);
1040 	WREG_CRT(15, 0);
1041 
1042 	RREG_CRT(0x11, crtc11);
1043 	crtc11 &= ~(MGAREG_CRTC11_CRTCPROTECT |
1044 		    MGAREG_CRTC11_VINTEN |
1045 		    MGAREG_CRTC11_VINTCLR);
1046 	WREG_CRT(0x11, crtc11);
1047 
1048 	if (mdev->type == G200_ER)
1049 		WREG_ECRT(0x24, 0x5);
1050 
1051 	if (mdev->type == G200_EW3)
1052 		WREG_ECRT(0x34, 0x5);
1053 
1054 	misc = RREG8(MGA_MISC_IN);
1055 	misc |= MGAREG_MISC_IOADSEL;
1056 	WREG8(MGA_MISC_OUT, misc);
1057 }
1058 
1059 static void mgag200_set_mode_regs(struct mga_device *mdev,
1060 				  const struct drm_display_mode *mode)
1061 {
1062 	unsigned int hdisplay, hsyncstart, hsyncend, htotal;
1063 	unsigned int vdisplay, vsyncstart, vsyncend, vtotal;
1064 	u8 misc, crtcext1, crtcext2, crtcext5;
1065 
1066 	hdisplay = mode->hdisplay / 8 - 1;
1067 	hsyncstart = mode->hsync_start / 8 - 1;
1068 	hsyncend = mode->hsync_end / 8 - 1;
1069 	htotal = mode->htotal / 8 - 1;
1070 
1071 	/* Work around hardware quirk */
1072 	if ((htotal & 0x07) == 0x06 || (htotal & 0x07) == 0x04)
1073 		htotal++;
1074 
1075 	vdisplay = mode->vdisplay - 1;
1076 	vsyncstart = mode->vsync_start - 1;
1077 	vsyncend = mode->vsync_end - 1;
1078 	vtotal = mode->vtotal - 2;
1079 
1080 	misc = RREG8(MGA_MISC_IN);
1081 
1082 	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1083 		misc |= MGAREG_MISC_HSYNCPOL;
1084 	else
1085 		misc &= ~MGAREG_MISC_HSYNCPOL;
1086 
1087 	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1088 		misc |= MGAREG_MISC_VSYNCPOL;
1089 	else
1090 		misc &= ~MGAREG_MISC_VSYNCPOL;
1091 
1092 	crtcext1 = (((htotal - 4) & 0x100) >> 8) |
1093 		   ((hdisplay & 0x100) >> 7) |
1094 		   ((hsyncstart & 0x100) >> 6) |
1095 		    (htotal & 0x40);
1096 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
1097 		crtcext1 |= BIT(7) | /* vrsten */
1098 			    BIT(3); /* hrsten */
1099 
1100 	crtcext2 = ((vtotal & 0xc00) >> 10) |
1101 		   ((vdisplay & 0x400) >> 8) |
1102 		   ((vdisplay & 0xc00) >> 7) |
1103 		   ((vsyncstart & 0xc00) >> 5) |
1104 		   ((vdisplay & 0x400) >> 3);
1105 	crtcext5 = 0x00;
1106 
1107 	WREG_CRT(0, htotal - 4);
1108 	WREG_CRT(1, hdisplay);
1109 	WREG_CRT(2, hdisplay);
1110 	WREG_CRT(3, (htotal & 0x1F) | 0x80);
1111 	WREG_CRT(4, hsyncstart);
1112 	WREG_CRT(5, ((htotal & 0x20) << 2) | (hsyncend & 0x1F));
1113 	WREG_CRT(6, vtotal & 0xFF);
1114 	WREG_CRT(7, ((vtotal & 0x100) >> 8) |
1115 		 ((vdisplay & 0x100) >> 7) |
1116 		 ((vsyncstart & 0x100) >> 6) |
1117 		 ((vdisplay & 0x100) >> 5) |
1118 		 ((vdisplay & 0x100) >> 4) | /* linecomp */
1119 		 ((vtotal & 0x200) >> 4) |
1120 		 ((vdisplay & 0x200) >> 3) |
1121 		 ((vsyncstart & 0x200) >> 2));
1122 	WREG_CRT(9, ((vdisplay & 0x200) >> 4) |
1123 		 ((vdisplay & 0x200) >> 3));
1124 	WREG_CRT(16, vsyncstart & 0xFF);
1125 	WREG_CRT(17, (vsyncend & 0x0F) | 0x20);
1126 	WREG_CRT(18, vdisplay & 0xFF);
1127 	WREG_CRT(20, 0);
1128 	WREG_CRT(21, vdisplay & 0xFF);
1129 	WREG_CRT(22, (vtotal + 1) & 0xFF);
1130 	WREG_CRT(23, 0xc3);
1131 	WREG_CRT(24, vdisplay & 0xFF);
1132 
1133 	WREG_ECRT(0x01, crtcext1);
1134 	WREG_ECRT(0x02, crtcext2);
1135 	WREG_ECRT(0x05, crtcext5);
1136 
1137 	WREG8(MGA_MISC_OUT, misc);
1138 }
1139 
1140 static u8 mgag200_get_bpp_shift(struct mga_device *mdev,
1141 				const struct drm_format_info *format)
1142 {
1143 	return mdev->bpp_shifts[format->cpp[0] - 1];
1144 }
1145 
1146 /*
1147  * Calculates the HW offset value from the framebuffer's pitch. The
1148  * offset is a multiple of the pixel size and depends on the display
1149  * format.
1150  */
1151 static u32 mgag200_calculate_offset(struct mga_device *mdev,
1152 				    const struct drm_framebuffer *fb)
1153 {
1154 	u32 offset = fb->pitches[0] / fb->format->cpp[0];
1155 	u8 bppshift = mgag200_get_bpp_shift(mdev, fb->format);
1156 
1157 	if (fb->format->cpp[0] * 8 == 24)
1158 		offset = (offset * 3) >> (4 - bppshift);
1159 	else
1160 		offset = offset >> (4 - bppshift);
1161 
1162 	return offset;
1163 }
1164 
1165 static void mgag200_set_offset(struct mga_device *mdev,
1166 			       const struct drm_framebuffer *fb)
1167 {
1168 	u8 crtc13, crtcext0;
1169 	u32 offset = mgag200_calculate_offset(mdev, fb);
1170 
1171 	RREG_ECRT(0, crtcext0);
1172 
1173 	crtc13 = offset & 0xff;
1174 
1175 	crtcext0 &= ~MGAREG_CRTCEXT0_OFFSET_MASK;
1176 	crtcext0 |= (offset >> 4) & MGAREG_CRTCEXT0_OFFSET_MASK;
1177 
1178 	WREG_CRT(0x13, crtc13);
1179 	WREG_ECRT(0x00, crtcext0);
1180 }
1181 
1182 static void mgag200_set_format_regs(struct mga_device *mdev,
1183 				    const struct drm_framebuffer *fb)
1184 {
1185 	struct drm_device *dev = &mdev->base;
1186 	const struct drm_format_info *format = fb->format;
1187 	unsigned int bpp, bppshift, scale;
1188 	u8 crtcext3, xmulctrl;
1189 
1190 	bpp = format->cpp[0] * 8;
1191 
1192 	bppshift = mgag200_get_bpp_shift(mdev, format);
1193 	switch (bpp) {
1194 	case 24:
1195 		scale = ((1 << bppshift) * 3) - 1;
1196 		break;
1197 	default:
1198 		scale = (1 << bppshift) - 1;
1199 		break;
1200 	}
1201 
1202 	RREG_ECRT(3, crtcext3);
1203 
1204 	switch (bpp) {
1205 	case 8:
1206 		xmulctrl = MGA1064_MUL_CTL_8bits;
1207 		break;
1208 	case 16:
1209 		if (format->depth == 15)
1210 			xmulctrl = MGA1064_MUL_CTL_15bits;
1211 		else
1212 			xmulctrl = MGA1064_MUL_CTL_16bits;
1213 		break;
1214 	case 24:
1215 		xmulctrl = MGA1064_MUL_CTL_24bits;
1216 		break;
1217 	case 32:
1218 		xmulctrl = MGA1064_MUL_CTL_32_24bits;
1219 		break;
1220 	default:
1221 		/* BUG: We should have caught this problem already. */
1222 		drm_WARN_ON(dev, "invalid format depth\n");
1223 		return;
1224 	}
1225 
1226 	crtcext3 &= ~GENMASK(2, 0);
1227 	crtcext3 |= scale;
1228 
1229 	WREG_DAC(MGA1064_MUL_CTL, xmulctrl);
1230 
1231 	WREG_GFX(0, 0x00);
1232 	WREG_GFX(1, 0x00);
1233 	WREG_GFX(2, 0x00);
1234 	WREG_GFX(3, 0x00);
1235 	WREG_GFX(4, 0x00);
1236 	WREG_GFX(5, 0x40);
1237 	WREG_GFX(6, 0x05);
1238 	WREG_GFX(7, 0x0f);
1239 	WREG_GFX(8, 0x0f);
1240 
1241 	WREG_ECRT(3, crtcext3);
1242 }
1243 
1244 static void mgag200_g200er_reset_tagfifo(struct mga_device *mdev)
1245 {
1246 	static uint32_t RESET_FLAG = 0x00200000; /* undocumented magic value */
1247 	u32 memctl;
1248 
1249 	memctl = RREG32(MGAREG_MEMCTL);
1250 
1251 	memctl |= RESET_FLAG;
1252 	WREG32(MGAREG_MEMCTL, memctl);
1253 
1254 	udelay(1000);
1255 
1256 	memctl &= ~RESET_FLAG;
1257 	WREG32(MGAREG_MEMCTL, memctl);
1258 }
1259 
1260 static void mgag200_g200se_set_hiprilvl(struct mga_device *mdev,
1261 					const struct drm_display_mode *mode,
1262 					const struct drm_framebuffer *fb)
1263 {
1264 	u32 unique_rev_id = mdev->model.g200se.unique_rev_id;
1265 	unsigned int hiprilvl;
1266 	u8 crtcext6;
1267 
1268 	if  (unique_rev_id >= 0x04) {
1269 		hiprilvl = 0;
1270 	} else if (unique_rev_id >= 0x02) {
1271 		unsigned int bpp;
1272 		unsigned long mb;
1273 
1274 		if (fb->format->cpp[0] * 8 > 16)
1275 			bpp = 32;
1276 		else if (fb->format->cpp[0] * 8 > 8)
1277 			bpp = 16;
1278 		else
1279 			bpp = 8;
1280 
1281 		mb = (mode->clock * bpp) / 1000;
1282 		if (mb > 3100)
1283 			hiprilvl = 0;
1284 		else if (mb > 2600)
1285 			hiprilvl = 1;
1286 		else if (mb > 1900)
1287 			hiprilvl = 2;
1288 		else if (mb > 1160)
1289 			hiprilvl = 3;
1290 		else if (mb > 440)
1291 			hiprilvl = 4;
1292 		else
1293 			hiprilvl = 5;
1294 
1295 	} else if (unique_rev_id >= 0x01) {
1296 		hiprilvl = 3;
1297 	} else {
1298 		hiprilvl = 4;
1299 	}
1300 
1301 	crtcext6 = hiprilvl; /* implicitly sets maxhipri to 0 */
1302 
1303 	WREG_ECRT(0x06, crtcext6);
1304 }
1305 
1306 static void mgag200_g200ev_set_hiprilvl(struct mga_device *mdev)
1307 {
1308 	WREG_ECRT(0x06, 0x00);
1309 }
1310 
1311 static void mgag200_enable_display(struct mga_device *mdev)
1312 {
1313 	u8 seq0, seq1, crtcext1;
1314 
1315 	RREG_SEQ(0x00, seq0);
1316 	seq0 |= MGAREG_SEQ0_SYNCRST |
1317 		MGAREG_SEQ0_ASYNCRST;
1318 	WREG_SEQ(0x00, seq0);
1319 
1320 	/*
1321 	 * TODO: replace busy waiting with vblank IRQ; put
1322 	 *       msleep(50) before changing SCROFF
1323 	 */
1324 	mga_wait_vsync(mdev);
1325 	mga_wait_busy(mdev);
1326 
1327 	RREG_SEQ(0x01, seq1);
1328 	seq1 &= ~MGAREG_SEQ1_SCROFF;
1329 	WREG_SEQ(0x01, seq1);
1330 
1331 	msleep(20);
1332 
1333 	RREG_ECRT(0x01, crtcext1);
1334 	crtcext1 &= ~MGAREG_CRTCEXT1_VSYNCOFF;
1335 	crtcext1 &= ~MGAREG_CRTCEXT1_HSYNCOFF;
1336 	WREG_ECRT(0x01, crtcext1);
1337 }
1338 
1339 static void mgag200_disable_display(struct mga_device *mdev)
1340 {
1341 	u8 seq0, seq1, crtcext1;
1342 
1343 	RREG_SEQ(0x00, seq0);
1344 	seq0 &= ~MGAREG_SEQ0_SYNCRST;
1345 	WREG_SEQ(0x00, seq0);
1346 
1347 	/*
1348 	 * TODO: replace busy waiting with vblank IRQ; put
1349 	 *       msleep(50) before changing SCROFF
1350 	 */
1351 	mga_wait_vsync(mdev);
1352 	mga_wait_busy(mdev);
1353 
1354 	RREG_SEQ(0x01, seq1);
1355 	seq1 |= MGAREG_SEQ1_SCROFF;
1356 	WREG_SEQ(0x01, seq1);
1357 
1358 	msleep(20);
1359 
1360 	RREG_ECRT(0x01, crtcext1);
1361 	crtcext1 |= MGAREG_CRTCEXT1_VSYNCOFF |
1362 		    MGAREG_CRTCEXT1_HSYNCOFF;
1363 	WREG_ECRT(0x01, crtcext1);
1364 }
1365 
1366 /*
1367  * Connector
1368  */
1369 
1370 static int mga_vga_get_modes(struct drm_connector *connector)
1371 {
1372 	struct mga_connector *mga_connector = to_mga_connector(connector);
1373 	struct edid *edid;
1374 	int ret = 0;
1375 
1376 	edid = drm_get_edid(connector, &mga_connector->i2c->adapter);
1377 	if (edid) {
1378 		drm_connector_update_edid_property(connector, edid);
1379 		ret = drm_add_edid_modes(connector, edid);
1380 		kfree(edid);
1381 	}
1382 	return ret;
1383 }
1384 
1385 static uint32_t mga_vga_calculate_mode_bandwidth(struct drm_display_mode *mode,
1386 							int bits_per_pixel)
1387 {
1388 	uint32_t total_area, divisor;
1389 	uint64_t active_area, pixels_per_second, bandwidth;
1390 	uint64_t bytes_per_pixel = (bits_per_pixel + 7) / 8;
1391 
1392 	divisor = 1024;
1393 
1394 	if (!mode->htotal || !mode->vtotal || !mode->clock)
1395 		return 0;
1396 
1397 	active_area = mode->hdisplay * mode->vdisplay;
1398 	total_area = mode->htotal * mode->vtotal;
1399 
1400 	pixels_per_second = active_area * mode->clock * 1000;
1401 	do_div(pixels_per_second, total_area);
1402 
1403 	bandwidth = pixels_per_second * bytes_per_pixel * 100;
1404 	do_div(bandwidth, divisor);
1405 
1406 	return (uint32_t)(bandwidth);
1407 }
1408 
1409 #define MODE_BANDWIDTH	MODE_BAD
1410 
1411 static enum drm_mode_status mga_vga_mode_valid(struct drm_connector *connector,
1412 				 struct drm_display_mode *mode)
1413 {
1414 	struct drm_device *dev = connector->dev;
1415 	struct mga_device *mdev = to_mga_device(dev);
1416 	int bpp = 32;
1417 
1418 	if (IS_G200_SE(mdev)) {
1419 		u32 unique_rev_id = mdev->model.g200se.unique_rev_id;
1420 
1421 		if (unique_rev_id == 0x01) {
1422 			if (mode->hdisplay > 1600)
1423 				return MODE_VIRTUAL_X;
1424 			if (mode->vdisplay > 1200)
1425 				return MODE_VIRTUAL_Y;
1426 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
1427 				> (24400 * 1024))
1428 				return MODE_BANDWIDTH;
1429 		} else if (unique_rev_id == 0x02) {
1430 			if (mode->hdisplay > 1920)
1431 				return MODE_VIRTUAL_X;
1432 			if (mode->vdisplay > 1200)
1433 				return MODE_VIRTUAL_Y;
1434 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
1435 				> (30100 * 1024))
1436 				return MODE_BANDWIDTH;
1437 		} else {
1438 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
1439 				> (55000 * 1024))
1440 				return MODE_BANDWIDTH;
1441 		}
1442 	} else if (mdev->type == G200_WB) {
1443 		if (mode->hdisplay > 1280)
1444 			return MODE_VIRTUAL_X;
1445 		if (mode->vdisplay > 1024)
1446 			return MODE_VIRTUAL_Y;
1447 		if (mga_vga_calculate_mode_bandwidth(mode, bpp) >
1448 		    (31877 * 1024))
1449 			return MODE_BANDWIDTH;
1450 	} else if (mdev->type == G200_EV &&
1451 		(mga_vga_calculate_mode_bandwidth(mode, bpp)
1452 			> (32700 * 1024))) {
1453 		return MODE_BANDWIDTH;
1454 	} else if (mdev->type == G200_EH &&
1455 		(mga_vga_calculate_mode_bandwidth(mode, bpp)
1456 			> (37500 * 1024))) {
1457 		return MODE_BANDWIDTH;
1458 	} else if (mdev->type == G200_ER &&
1459 		(mga_vga_calculate_mode_bandwidth(mode,
1460 			bpp) > (55000 * 1024))) {
1461 		return MODE_BANDWIDTH;
1462 	}
1463 
1464 	if ((mode->hdisplay % 8) != 0 || (mode->hsync_start % 8) != 0 ||
1465 	    (mode->hsync_end % 8) != 0 || (mode->htotal % 8) != 0) {
1466 		return MODE_H_ILLEGAL;
1467 	}
1468 
1469 	if (mode->crtc_hdisplay > 2048 || mode->crtc_hsync_start > 4096 ||
1470 	    mode->crtc_hsync_end > 4096 || mode->crtc_htotal > 4096 ||
1471 	    mode->crtc_vdisplay > 2048 || mode->crtc_vsync_start > 4096 ||
1472 	    mode->crtc_vsync_end > 4096 || mode->crtc_vtotal > 4096) {
1473 		return MODE_BAD;
1474 	}
1475 
1476 	/* Validate the mode input by the user */
1477 	if (connector->cmdline_mode.specified) {
1478 		if (connector->cmdline_mode.bpp_specified)
1479 			bpp = connector->cmdline_mode.bpp;
1480 	}
1481 
1482 	if ((mode->hdisplay * mode->vdisplay * (bpp/8)) > mdev->vram_fb_available) {
1483 		if (connector->cmdline_mode.specified)
1484 			connector->cmdline_mode.specified = false;
1485 		return MODE_BAD;
1486 	}
1487 
1488 	return MODE_OK;
1489 }
1490 
1491 static void mga_connector_destroy(struct drm_connector *connector)
1492 {
1493 	struct mga_connector *mga_connector = to_mga_connector(connector);
1494 	mgag200_i2c_destroy(mga_connector->i2c);
1495 	drm_connector_cleanup(connector);
1496 }
1497 
1498 static const struct drm_connector_helper_funcs mga_vga_connector_helper_funcs = {
1499 	.get_modes  = mga_vga_get_modes,
1500 	.mode_valid = mga_vga_mode_valid,
1501 };
1502 
1503 static const struct drm_connector_funcs mga_vga_connector_funcs = {
1504 	.reset                  = drm_atomic_helper_connector_reset,
1505 	.fill_modes             = drm_helper_probe_single_connector_modes,
1506 	.destroy                = mga_connector_destroy,
1507 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1508 	.atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
1509 };
1510 
1511 static int mgag200_vga_connector_init(struct mga_device *mdev)
1512 {
1513 	struct drm_device *dev = &mdev->base;
1514 	struct mga_connector *mconnector = &mdev->connector;
1515 	struct drm_connector *connector = &mconnector->base;
1516 	struct mga_i2c_chan *i2c;
1517 	int ret;
1518 
1519 	i2c = mgag200_i2c_create(dev);
1520 	if (!i2c)
1521 		drm_warn(dev, "failed to add DDC bus\n");
1522 
1523 	ret = drm_connector_init_with_ddc(dev, connector,
1524 					  &mga_vga_connector_funcs,
1525 					  DRM_MODE_CONNECTOR_VGA,
1526 					  &i2c->adapter);
1527 	if (ret)
1528 		goto err_mgag200_i2c_destroy;
1529 	drm_connector_helper_add(connector, &mga_vga_connector_helper_funcs);
1530 
1531 	mconnector->i2c = i2c;
1532 
1533 	return 0;
1534 
1535 err_mgag200_i2c_destroy:
1536 	mgag200_i2c_destroy(i2c);
1537 	return ret;
1538 }
1539 
1540 /*
1541  * Simple Display Pipe
1542  */
1543 
1544 static enum drm_mode_status
1545 mgag200_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
1546 				       const struct drm_display_mode *mode)
1547 {
1548 	return MODE_OK;
1549 }
1550 
1551 static void
1552 mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb,
1553 		      struct drm_rect *clip, const struct dma_buf_map *map)
1554 {
1555 	void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
1556 
1557 	drm_fb_memcpy_dstclip(mdev->vram, fb->pitches[0], vmap, fb, clip);
1558 
1559 	/* Always scanout image at VRAM offset 0 */
1560 	mgag200_set_startadd(mdev, (u32)0);
1561 	mgag200_set_offset(mdev, fb);
1562 }
1563 
1564 static void
1565 mgag200_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
1566 				   struct drm_crtc_state *crtc_state,
1567 				   struct drm_plane_state *plane_state)
1568 {
1569 	struct drm_crtc *crtc = &pipe->crtc;
1570 	struct drm_device *dev = crtc->dev;
1571 	struct mga_device *mdev = to_mga_device(dev);
1572 	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
1573 	struct drm_framebuffer *fb = plane_state->fb;
1574 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
1575 	struct drm_rect fullscreen = {
1576 		.x1 = 0,
1577 		.x2 = fb->width,
1578 		.y1 = 0,
1579 		.y2 = fb->height,
1580 	};
1581 
1582 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
1583 		mgag200_g200wb_hold_bmc(mdev);
1584 
1585 	mgag200_set_format_regs(mdev, fb);
1586 	mgag200_set_mode_regs(mdev, adjusted_mode);
1587 	mgag200_crtc_set_plls(mdev, adjusted_mode->clock);
1588 
1589 	if (mdev->type == G200_ER)
1590 		mgag200_g200er_reset_tagfifo(mdev);
1591 
1592 	if (IS_G200_SE(mdev))
1593 		mgag200_g200se_set_hiprilvl(mdev, adjusted_mode, fb);
1594 	else if (mdev->type == G200_EV)
1595 		mgag200_g200ev_set_hiprilvl(mdev);
1596 
1597 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
1598 		mgag200_g200wb_release_bmc(mdev);
1599 
1600 	mga_crtc_load_lut(crtc);
1601 	mgag200_enable_display(mdev);
1602 
1603 	mgag200_handle_damage(mdev, fb, &fullscreen, &shadow_plane_state->map[0]);
1604 }
1605 
1606 static void
1607 mgag200_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
1608 {
1609 	struct drm_crtc *crtc = &pipe->crtc;
1610 	struct mga_device *mdev = to_mga_device(crtc->dev);
1611 
1612 	mgag200_disable_display(mdev);
1613 }
1614 
1615 static int
1616 mgag200_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
1617 				  struct drm_plane_state *plane_state,
1618 				  struct drm_crtc_state *crtc_state)
1619 {
1620 	struct drm_plane *plane = plane_state->plane;
1621 	struct drm_framebuffer *new_fb = plane_state->fb;
1622 	struct drm_framebuffer *fb = NULL;
1623 
1624 	if (!new_fb)
1625 		return 0;
1626 
1627 	if (plane->state)
1628 		fb = plane->state->fb;
1629 
1630 	if (!fb || (fb->format != new_fb->format))
1631 		crtc_state->mode_changed = true; /* update PLL settings */
1632 
1633 	return 0;
1634 }
1635 
1636 static void
1637 mgag200_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
1638 				   struct drm_plane_state *old_state)
1639 {
1640 	struct drm_plane *plane = &pipe->plane;
1641 	struct drm_device *dev = plane->dev;
1642 	struct mga_device *mdev = to_mga_device(dev);
1643 	struct drm_plane_state *state = plane->state;
1644 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
1645 	struct drm_framebuffer *fb = state->fb;
1646 	struct drm_rect damage;
1647 
1648 	if (!fb)
1649 		return;
1650 
1651 	if (drm_atomic_helper_damage_merged(old_state, state, &damage))
1652 		mgag200_handle_damage(mdev, fb, &damage, &shadow_plane_state->map[0]);
1653 }
1654 
1655 static const struct drm_simple_display_pipe_funcs
1656 mgag200_simple_display_pipe_funcs = {
1657 	.mode_valid = mgag200_simple_display_pipe_mode_valid,
1658 	.enable	    = mgag200_simple_display_pipe_enable,
1659 	.disable    = mgag200_simple_display_pipe_disable,
1660 	.check	    = mgag200_simple_display_pipe_check,
1661 	.update	    = mgag200_simple_display_pipe_update,
1662 	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
1663 };
1664 
1665 static const uint32_t mgag200_simple_display_pipe_formats[] = {
1666 	DRM_FORMAT_XRGB8888,
1667 	DRM_FORMAT_RGB565,
1668 	DRM_FORMAT_RGB888,
1669 };
1670 
1671 static const uint64_t mgag200_simple_display_pipe_fmtmods[] = {
1672 	DRM_FORMAT_MOD_LINEAR,
1673 	DRM_FORMAT_MOD_INVALID
1674 };
1675 
1676 /*
1677  * Mode config
1678  */
1679 
1680 static const struct drm_mode_config_funcs mgag200_mode_config_funcs = {
1681 	.fb_create     = drm_gem_fb_create_with_dirty,
1682 	.atomic_check  = drm_atomic_helper_check,
1683 	.atomic_commit = drm_atomic_helper_commit,
1684 };
1685 
1686 static unsigned int mgag200_preferred_depth(struct mga_device *mdev)
1687 {
1688 	if (IS_G200_SE(mdev) && mdev->vram_fb_available < (2048*1024))
1689 		return 16;
1690 	else
1691 		return 32;
1692 }
1693 
1694 int mgag200_modeset_init(struct mga_device *mdev)
1695 {
1696 	struct drm_device *dev = &mdev->base;
1697 	struct drm_connector *connector = &mdev->connector.base;
1698 	struct drm_simple_display_pipe *pipe = &mdev->display_pipe;
1699 	size_t format_count = ARRAY_SIZE(mgag200_simple_display_pipe_formats);
1700 	int ret;
1701 
1702 	mdev->bpp_shifts[0] = 0;
1703 	mdev->bpp_shifts[1] = 1;
1704 	mdev->bpp_shifts[2] = 0;
1705 	mdev->bpp_shifts[3] = 2;
1706 
1707 	mgag200_init_regs(mdev);
1708 
1709 	ret = drmm_mode_config_init(dev);
1710 	if (ret) {
1711 		drm_err(dev, "drmm_mode_config_init() failed, error %d\n",
1712 			ret);
1713 		return ret;
1714 	}
1715 
1716 	dev->mode_config.max_width = MGAG200_MAX_FB_WIDTH;
1717 	dev->mode_config.max_height = MGAG200_MAX_FB_HEIGHT;
1718 
1719 	dev->mode_config.preferred_depth = mgag200_preferred_depth(mdev);
1720 
1721 	dev->mode_config.fb_base = mdev->mc.vram_base;
1722 
1723 	dev->mode_config.funcs = &mgag200_mode_config_funcs;
1724 
1725 	ret = mgag200_vga_connector_init(mdev);
1726 	if (ret) {
1727 		drm_err(dev,
1728 			"mgag200_vga_connector_init() failed, error %d\n",
1729 			ret);
1730 		return ret;
1731 	}
1732 
1733 	ret = drm_simple_display_pipe_init(dev, pipe,
1734 					   &mgag200_simple_display_pipe_funcs,
1735 					   mgag200_simple_display_pipe_formats,
1736 					   format_count,
1737 					   mgag200_simple_display_pipe_fmtmods,
1738 					   connector);
1739 	if (ret) {
1740 		drm_err(dev,
1741 			"drm_simple_display_pipe_init() failed, error %d\n",
1742 			ret);
1743 		return ret;
1744 	}
1745 
1746 	/* FIXME: legacy gamma tables; convert to CRTC state */
1747 	drm_mode_crtc_set_gamma_size(&pipe->crtc, MGAG200_LUT_SIZE);
1748 
1749 	drm_mode_config_reset(dev);
1750 
1751 	return 0;
1752 }
1753