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/iosys-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 static void mgag200_g200wb_hold_bmc(struct mga_device *mdev)
114 {
115 	u8 tmp;
116 	int iter_max;
117 
118 	/* 1- The first step is to warn the BMC of an upcoming mode change.
119 	 * We are putting the misc<0> to output.*/
120 
121 	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
122 	tmp = RREG8(DAC_DATA);
123 	tmp |= 0x10;
124 	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
125 
126 	/* we are putting a 1 on the misc<0> line */
127 	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
128 	tmp = RREG8(DAC_DATA);
129 	tmp |= 0x10;
130 	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
131 
132 	/* 2- Second step to mask and further scan request
133 	 * This will be done by asserting the remfreqmsk bit (XSPAREREG<7>)
134 	 */
135 	WREG8(DAC_INDEX, MGA1064_SPAREREG);
136 	tmp = RREG8(DAC_DATA);
137 	tmp |= 0x80;
138 	WREG_DAC(MGA1064_SPAREREG, tmp);
139 
140 	/* 3a- the third step is to verifu if there is an active scan
141 	 * We are searching for a 0 on remhsyncsts <XSPAREREG<0>)
142 	 */
143 	iter_max = 300;
144 	while (!(tmp & 0x1) && iter_max) {
145 		WREG8(DAC_INDEX, MGA1064_SPAREREG);
146 		tmp = RREG8(DAC_DATA);
147 		udelay(1000);
148 		iter_max--;
149 	}
150 
151 	/* 3b- this step occurs only if the remove is actually scanning
152 	 * we are waiting for the end of the frame which is a 1 on
153 	 * remvsyncsts (XSPAREREG<1>)
154 	 */
155 	if (iter_max) {
156 		iter_max = 300;
157 		while ((tmp & 0x2) && iter_max) {
158 			WREG8(DAC_INDEX, MGA1064_SPAREREG);
159 			tmp = RREG8(DAC_DATA);
160 			udelay(1000);
161 			iter_max--;
162 		}
163 	}
164 }
165 
166 static void mgag200_g200wb_release_bmc(struct mga_device *mdev)
167 {
168 	u8 tmp;
169 
170 	/* 1- The first step is to ensure that the vrsten and hrsten are set */
171 	WREG8(MGAREG_CRTCEXT_INDEX, 1);
172 	tmp = RREG8(MGAREG_CRTCEXT_DATA);
173 	WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
174 
175 	/* 2- second step is to assert the rstlvl2 */
176 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
177 	tmp = RREG8(DAC_DATA);
178 	tmp |= 0x8;
179 	WREG8(DAC_DATA, tmp);
180 
181 	/* wait 10 us */
182 	udelay(10);
183 
184 	/* 3- deassert rstlvl2 */
185 	tmp &= ~0x08;
186 	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
187 	WREG8(DAC_DATA, tmp);
188 
189 	/* 4- remove mask of scan request */
190 	WREG8(DAC_INDEX, MGA1064_SPAREREG);
191 	tmp = RREG8(DAC_DATA);
192 	tmp &= ~0x80;
193 	WREG8(DAC_DATA, tmp);
194 
195 	/* 5- put back a 0 on the misc<0> line */
196 	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
197 	tmp = RREG8(DAC_DATA);
198 	tmp &= ~0x10;
199 	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
200 }
201 
202 /*
203  * This is how the framebuffer base address is stored in g200 cards:
204  *   * Assume @offset is the gpu_addr variable of the framebuffer object
205  *   * Then addr is the number of _pixels_ (not bytes) from the start of
206  *     VRAM to the first pixel we want to display. (divided by 2 for 32bit
207  *     framebuffers)
208  *   * addr is stored in the CRTCEXT0, CRTCC and CRTCD registers
209  *      addr<20> -> CRTCEXT0<6>
210  *      addr<19-16> -> CRTCEXT0<3-0>
211  *      addr<15-8> -> CRTCC<7-0>
212  *      addr<7-0> -> CRTCD<7-0>
213  *
214  *  CRTCEXT0 has to be programmed last to trigger an update and make the
215  *  new addr variable take effect.
216  */
217 static void mgag200_set_startadd(struct mga_device *mdev,
218 				 unsigned long offset)
219 {
220 	struct drm_device *dev = &mdev->base;
221 	u32 startadd;
222 	u8 crtcc, crtcd, crtcext0;
223 
224 	startadd = offset / 8;
225 
226 	/*
227 	 * Can't store addresses any higher than that, but we also
228 	 * don't have more than 16 MiB of memory, so it should be fine.
229 	 */
230 	drm_WARN_ON(dev, startadd > 0x1fffff);
231 
232 	RREG_ECRT(0x00, crtcext0);
233 
234 	crtcc = (startadd >> 8) & 0xff;
235 	crtcd = startadd & 0xff;
236 	crtcext0 &= 0xb0;
237 	crtcext0 |= ((startadd >> 14) & BIT(6)) |
238 		    ((startadd >> 16) & 0x0f);
239 
240 	WREG_CRT(0x0c, crtcc);
241 	WREG_CRT(0x0d, crtcd);
242 	WREG_ECRT(0x00, crtcext0);
243 }
244 
245 static void mgag200_set_dac_regs(struct mga_device *mdev)
246 {
247 	size_t i;
248 	u8 dacvalue[] = {
249 		/* 0x00: */        0,    0,    0,    0,    0,    0, 0x00,    0,
250 		/* 0x08: */        0,    0,    0,    0,    0,    0,    0,    0,
251 		/* 0x10: */        0,    0,    0,    0,    0,    0,    0,    0,
252 		/* 0x18: */     0x00,    0, 0xC9, 0xFF, 0xBF, 0x20, 0x1F, 0x20,
253 		/* 0x20: */     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
254 		/* 0x28: */     0x00, 0x00, 0x00, 0x00,    0,    0,    0, 0x40,
255 		/* 0x30: */     0x00, 0xB0, 0x00, 0xC2, 0x34, 0x14, 0x02, 0x83,
256 		/* 0x38: */     0x00, 0x93, 0x00, 0x77, 0x00, 0x00, 0x00, 0x3A,
257 		/* 0x40: */        0,    0,    0,    0,    0,    0,    0,    0,
258 		/* 0x48: */        0,    0,    0,    0,    0,    0,    0,    0
259 	};
260 
261 	switch (mdev->type) {
262 	case G200_PCI:
263 	case G200_AGP:
264 		dacvalue[MGA1064_SYS_PLL_M] = 0x04;
265 		dacvalue[MGA1064_SYS_PLL_N] = 0x2D;
266 		dacvalue[MGA1064_SYS_PLL_P] = 0x19;
267 		break;
268 	case G200_SE_A:
269 	case G200_SE_B:
270 		dacvalue[MGA1064_VREF_CTL] = 0x03;
271 		dacvalue[MGA1064_PIX_CLK_CTL] = MGA1064_PIX_CLK_CTL_SEL_PLL;
272 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_DAC_EN |
273 					     MGA1064_MISC_CTL_VGA8 |
274 					     MGA1064_MISC_CTL_DAC_RAM_CS;
275 		break;
276 	case G200_WB:
277 	case G200_EW3:
278 		dacvalue[MGA1064_VREF_CTL] = 0x07;
279 		break;
280 	case G200_EV:
281 		dacvalue[MGA1064_PIX_CLK_CTL] = MGA1064_PIX_CLK_CTL_SEL_PLL;
282 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_VGA8 |
283 					     MGA1064_MISC_CTL_DAC_RAM_CS;
284 		break;
285 	case G200_EH:
286 	case G200_EH3:
287 		dacvalue[MGA1064_MISC_CTL] = MGA1064_MISC_CTL_VGA8 |
288 					     MGA1064_MISC_CTL_DAC_RAM_CS;
289 		break;
290 	case G200_ER:
291 		break;
292 	}
293 
294 	for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
295 		if ((i <= 0x17) ||
296 		    (i == 0x1b) ||
297 		    (i == 0x1c) ||
298 		    ((i >= 0x1f) && (i <= 0x29)) ||
299 		    ((i >= 0x30) && (i <= 0x37)))
300 			continue;
301 		if (IS_G200_SE(mdev) &&
302 		    ((i == 0x2c) || (i == 0x2d) || (i == 0x2e)))
303 			continue;
304 		if ((mdev->type == G200_EV ||
305 		    mdev->type == G200_WB ||
306 		    mdev->type == G200_EH ||
307 		    mdev->type == G200_EW3 ||
308 		    mdev->type == G200_EH3) &&
309 		    (i >= 0x44) && (i <= 0x4e))
310 			continue;
311 
312 		WREG_DAC(i, dacvalue[i]);
313 	}
314 
315 	if (mdev->type == G200_ER)
316 		WREG_DAC(0x90, 0);
317 }
318 
319 static void mgag200_init_regs(struct mga_device *mdev)
320 {
321 	u8 crtc11, misc;
322 
323 	mgag200_set_dac_regs(mdev);
324 
325 	WREG_SEQ(2, 0x0f);
326 	WREG_SEQ(3, 0x00);
327 	WREG_SEQ(4, 0x0e);
328 
329 	WREG_CRT(10, 0);
330 	WREG_CRT(11, 0);
331 	WREG_CRT(12, 0);
332 	WREG_CRT(13, 0);
333 	WREG_CRT(14, 0);
334 	WREG_CRT(15, 0);
335 
336 	RREG_CRT(0x11, crtc11);
337 	crtc11 &= ~(MGAREG_CRTC11_CRTCPROTECT |
338 		    MGAREG_CRTC11_VINTEN |
339 		    MGAREG_CRTC11_VINTCLR);
340 	WREG_CRT(0x11, crtc11);
341 
342 	if (mdev->type == G200_ER)
343 		WREG_ECRT(0x24, 0x5);
344 
345 	if (mdev->type == G200_EW3)
346 		WREG_ECRT(0x34, 0x5);
347 
348 	misc = RREG8(MGA_MISC_IN);
349 	misc |= MGAREG_MISC_IOADSEL;
350 	WREG8(MGA_MISC_OUT, misc);
351 }
352 
353 static void mgag200_set_mode_regs(struct mga_device *mdev,
354 				  const struct drm_display_mode *mode)
355 {
356 	unsigned int hdisplay, hsyncstart, hsyncend, htotal;
357 	unsigned int vdisplay, vsyncstart, vsyncend, vtotal;
358 	u8 misc, crtcext1, crtcext2, crtcext5;
359 
360 	hdisplay = mode->hdisplay / 8 - 1;
361 	hsyncstart = mode->hsync_start / 8 - 1;
362 	hsyncend = mode->hsync_end / 8 - 1;
363 	htotal = mode->htotal / 8 - 1;
364 
365 	/* Work around hardware quirk */
366 	if ((htotal & 0x07) == 0x06 || (htotal & 0x07) == 0x04)
367 		htotal++;
368 
369 	vdisplay = mode->vdisplay - 1;
370 	vsyncstart = mode->vsync_start - 1;
371 	vsyncend = mode->vsync_end - 1;
372 	vtotal = mode->vtotal - 2;
373 
374 	misc = RREG8(MGA_MISC_IN);
375 
376 	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
377 		misc |= MGAREG_MISC_HSYNCPOL;
378 	else
379 		misc &= ~MGAREG_MISC_HSYNCPOL;
380 
381 	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
382 		misc |= MGAREG_MISC_VSYNCPOL;
383 	else
384 		misc &= ~MGAREG_MISC_VSYNCPOL;
385 
386 	crtcext1 = (((htotal - 4) & 0x100) >> 8) |
387 		   ((hdisplay & 0x100) >> 7) |
388 		   ((hsyncstart & 0x100) >> 6) |
389 		    (htotal & 0x40);
390 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
391 		crtcext1 |= BIT(7) | /* vrsten */
392 			    BIT(3); /* hrsten */
393 
394 	crtcext2 = ((vtotal & 0xc00) >> 10) |
395 		   ((vdisplay & 0x400) >> 8) |
396 		   ((vdisplay & 0xc00) >> 7) |
397 		   ((vsyncstart & 0xc00) >> 5) |
398 		   ((vdisplay & 0x400) >> 3);
399 	crtcext5 = 0x00;
400 
401 	WREG_CRT(0, htotal - 4);
402 	WREG_CRT(1, hdisplay);
403 	WREG_CRT(2, hdisplay);
404 	WREG_CRT(3, (htotal & 0x1F) | 0x80);
405 	WREG_CRT(4, hsyncstart);
406 	WREG_CRT(5, ((htotal & 0x20) << 2) | (hsyncend & 0x1F));
407 	WREG_CRT(6, vtotal & 0xFF);
408 	WREG_CRT(7, ((vtotal & 0x100) >> 8) |
409 		 ((vdisplay & 0x100) >> 7) |
410 		 ((vsyncstart & 0x100) >> 6) |
411 		 ((vdisplay & 0x100) >> 5) |
412 		 ((vdisplay & 0x100) >> 4) | /* linecomp */
413 		 ((vtotal & 0x200) >> 4) |
414 		 ((vdisplay & 0x200) >> 3) |
415 		 ((vsyncstart & 0x200) >> 2));
416 	WREG_CRT(9, ((vdisplay & 0x200) >> 4) |
417 		 ((vdisplay & 0x200) >> 3));
418 	WREG_CRT(16, vsyncstart & 0xFF);
419 	WREG_CRT(17, (vsyncend & 0x0F) | 0x20);
420 	WREG_CRT(18, vdisplay & 0xFF);
421 	WREG_CRT(20, 0);
422 	WREG_CRT(21, vdisplay & 0xFF);
423 	WREG_CRT(22, (vtotal + 1) & 0xFF);
424 	WREG_CRT(23, 0xc3);
425 	WREG_CRT(24, vdisplay & 0xFF);
426 
427 	WREG_ECRT(0x01, crtcext1);
428 	WREG_ECRT(0x02, crtcext2);
429 	WREG_ECRT(0x05, crtcext5);
430 
431 	WREG8(MGA_MISC_OUT, misc);
432 }
433 
434 static u8 mgag200_get_bpp_shift(const struct drm_format_info *format)
435 {
436 	static const u8 bpp_shift[] = {0, 1, 0, 2};
437 
438 	return bpp_shift[format->cpp[0] - 1];
439 }
440 
441 /*
442  * Calculates the HW offset value from the framebuffer's pitch. The
443  * offset is a multiple of the pixel size and depends on the display
444  * format.
445  */
446 static u32 mgag200_calculate_offset(struct mga_device *mdev,
447 				    const struct drm_framebuffer *fb)
448 {
449 	u32 offset = fb->pitches[0] / fb->format->cpp[0];
450 	u8 bppshift = mgag200_get_bpp_shift(fb->format);
451 
452 	if (fb->format->cpp[0] * 8 == 24)
453 		offset = (offset * 3) >> (4 - bppshift);
454 	else
455 		offset = offset >> (4 - bppshift);
456 
457 	return offset;
458 }
459 
460 static void mgag200_set_offset(struct mga_device *mdev,
461 			       const struct drm_framebuffer *fb)
462 {
463 	u8 crtc13, crtcext0;
464 	u32 offset = mgag200_calculate_offset(mdev, fb);
465 
466 	RREG_ECRT(0, crtcext0);
467 
468 	crtc13 = offset & 0xff;
469 
470 	crtcext0 &= ~MGAREG_CRTCEXT0_OFFSET_MASK;
471 	crtcext0 |= (offset >> 4) & MGAREG_CRTCEXT0_OFFSET_MASK;
472 
473 	WREG_CRT(0x13, crtc13);
474 	WREG_ECRT(0x00, crtcext0);
475 }
476 
477 static void mgag200_set_format_regs(struct mga_device *mdev,
478 				    const struct drm_framebuffer *fb)
479 {
480 	struct drm_device *dev = &mdev->base;
481 	const struct drm_format_info *format = fb->format;
482 	unsigned int bpp, bppshift, scale;
483 	u8 crtcext3, xmulctrl;
484 
485 	bpp = format->cpp[0] * 8;
486 
487 	bppshift = mgag200_get_bpp_shift(format);
488 	switch (bpp) {
489 	case 24:
490 		scale = ((1 << bppshift) * 3) - 1;
491 		break;
492 	default:
493 		scale = (1 << bppshift) - 1;
494 		break;
495 	}
496 
497 	RREG_ECRT(3, crtcext3);
498 
499 	switch (bpp) {
500 	case 8:
501 		xmulctrl = MGA1064_MUL_CTL_8bits;
502 		break;
503 	case 16:
504 		if (format->depth == 15)
505 			xmulctrl = MGA1064_MUL_CTL_15bits;
506 		else
507 			xmulctrl = MGA1064_MUL_CTL_16bits;
508 		break;
509 	case 24:
510 		xmulctrl = MGA1064_MUL_CTL_24bits;
511 		break;
512 	case 32:
513 		xmulctrl = MGA1064_MUL_CTL_32_24bits;
514 		break;
515 	default:
516 		/* BUG: We should have caught this problem already. */
517 		drm_WARN_ON(dev, "invalid format depth\n");
518 		return;
519 	}
520 
521 	crtcext3 &= ~GENMASK(2, 0);
522 	crtcext3 |= scale;
523 
524 	WREG_DAC(MGA1064_MUL_CTL, xmulctrl);
525 
526 	WREG_GFX(0, 0x00);
527 	WREG_GFX(1, 0x00);
528 	WREG_GFX(2, 0x00);
529 	WREG_GFX(3, 0x00);
530 	WREG_GFX(4, 0x00);
531 	WREG_GFX(5, 0x40);
532 	/* GCTL6 should be 0x05, but we configure memmapsl to 0xb8000 (text mode),
533 	 * so that it doesn't hang when running kexec/kdump on G200_SE rev42.
534 	 */
535 	WREG_GFX(6, 0x0d);
536 	WREG_GFX(7, 0x0f);
537 	WREG_GFX(8, 0x0f);
538 
539 	WREG_ECRT(3, crtcext3);
540 }
541 
542 static void mgag200_g200er_reset_tagfifo(struct mga_device *mdev)
543 {
544 	static uint32_t RESET_FLAG = 0x00200000; /* undocumented magic value */
545 	u32 memctl;
546 
547 	memctl = RREG32(MGAREG_MEMCTL);
548 
549 	memctl |= RESET_FLAG;
550 	WREG32(MGAREG_MEMCTL, memctl);
551 
552 	udelay(1000);
553 
554 	memctl &= ~RESET_FLAG;
555 	WREG32(MGAREG_MEMCTL, memctl);
556 }
557 
558 static void mgag200_g200se_set_hiprilvl(struct mga_device *mdev,
559 					const struct drm_display_mode *mode,
560 					const struct drm_framebuffer *fb)
561 {
562 	u32 unique_rev_id = mdev->model.g200se.unique_rev_id;
563 	unsigned int hiprilvl;
564 	u8 crtcext6;
565 
566 	if  (unique_rev_id >= 0x04) {
567 		hiprilvl = 0;
568 	} else if (unique_rev_id >= 0x02) {
569 		unsigned int bpp;
570 		unsigned long mb;
571 
572 		if (fb->format->cpp[0] * 8 > 16)
573 			bpp = 32;
574 		else if (fb->format->cpp[0] * 8 > 8)
575 			bpp = 16;
576 		else
577 			bpp = 8;
578 
579 		mb = (mode->clock * bpp) / 1000;
580 		if (mb > 3100)
581 			hiprilvl = 0;
582 		else if (mb > 2600)
583 			hiprilvl = 1;
584 		else if (mb > 1900)
585 			hiprilvl = 2;
586 		else if (mb > 1160)
587 			hiprilvl = 3;
588 		else if (mb > 440)
589 			hiprilvl = 4;
590 		else
591 			hiprilvl = 5;
592 
593 	} else if (unique_rev_id >= 0x01) {
594 		hiprilvl = 3;
595 	} else {
596 		hiprilvl = 4;
597 	}
598 
599 	crtcext6 = hiprilvl; /* implicitly sets maxhipri to 0 */
600 
601 	WREG_ECRT(0x06, crtcext6);
602 }
603 
604 static void mgag200_g200ev_set_hiprilvl(struct mga_device *mdev)
605 {
606 	WREG_ECRT(0x06, 0x00);
607 }
608 
609 static void mgag200_enable_display(struct mga_device *mdev)
610 {
611 	u8 seq0, seq1, crtcext1;
612 
613 	RREG_SEQ(0x00, seq0);
614 	seq0 |= MGAREG_SEQ0_SYNCRST |
615 		MGAREG_SEQ0_ASYNCRST;
616 	WREG_SEQ(0x00, seq0);
617 
618 	/*
619 	 * TODO: replace busy waiting with vblank IRQ; put
620 	 *       msleep(50) before changing SCROFF
621 	 */
622 	mga_wait_vsync(mdev);
623 	mga_wait_busy(mdev);
624 
625 	RREG_SEQ(0x01, seq1);
626 	seq1 &= ~MGAREG_SEQ1_SCROFF;
627 	WREG_SEQ(0x01, seq1);
628 
629 	msleep(20);
630 
631 	RREG_ECRT(0x01, crtcext1);
632 	crtcext1 &= ~MGAREG_CRTCEXT1_VSYNCOFF;
633 	crtcext1 &= ~MGAREG_CRTCEXT1_HSYNCOFF;
634 	WREG_ECRT(0x01, crtcext1);
635 }
636 
637 static void mgag200_disable_display(struct mga_device *mdev)
638 {
639 	u8 seq0, seq1, crtcext1;
640 
641 	RREG_SEQ(0x00, seq0);
642 	seq0 &= ~MGAREG_SEQ0_SYNCRST;
643 	WREG_SEQ(0x00, seq0);
644 
645 	/*
646 	 * TODO: replace busy waiting with vblank IRQ; put
647 	 *       msleep(50) before changing SCROFF
648 	 */
649 	mga_wait_vsync(mdev);
650 	mga_wait_busy(mdev);
651 
652 	RREG_SEQ(0x01, seq1);
653 	seq1 |= MGAREG_SEQ1_SCROFF;
654 	WREG_SEQ(0x01, seq1);
655 
656 	msleep(20);
657 
658 	RREG_ECRT(0x01, crtcext1);
659 	crtcext1 |= MGAREG_CRTCEXT1_VSYNCOFF |
660 		    MGAREG_CRTCEXT1_HSYNCOFF;
661 	WREG_ECRT(0x01, crtcext1);
662 }
663 
664 /*
665  * Connector
666  */
667 
668 static int mga_vga_get_modes(struct drm_connector *connector)
669 {
670 	struct mga_connector *mga_connector = to_mga_connector(connector);
671 	struct edid *edid;
672 	int ret = 0;
673 
674 	edid = drm_get_edid(connector, &mga_connector->i2c->adapter);
675 	if (edid) {
676 		drm_connector_update_edid_property(connector, edid);
677 		ret = drm_add_edid_modes(connector, edid);
678 		kfree(edid);
679 	}
680 	return ret;
681 }
682 
683 static uint32_t mga_vga_calculate_mode_bandwidth(struct drm_display_mode *mode,
684 							int bits_per_pixel)
685 {
686 	uint32_t total_area, divisor;
687 	uint64_t active_area, pixels_per_second, bandwidth;
688 	uint64_t bytes_per_pixel = (bits_per_pixel + 7) / 8;
689 
690 	divisor = 1024;
691 
692 	if (!mode->htotal || !mode->vtotal || !mode->clock)
693 		return 0;
694 
695 	active_area = mode->hdisplay * mode->vdisplay;
696 	total_area = mode->htotal * mode->vtotal;
697 
698 	pixels_per_second = active_area * mode->clock * 1000;
699 	do_div(pixels_per_second, total_area);
700 
701 	bandwidth = pixels_per_second * bytes_per_pixel * 100;
702 	do_div(bandwidth, divisor);
703 
704 	return (uint32_t)(bandwidth);
705 }
706 
707 #define MODE_BANDWIDTH	MODE_BAD
708 
709 static enum drm_mode_status mga_vga_mode_valid(struct drm_connector *connector,
710 				 struct drm_display_mode *mode)
711 {
712 	struct drm_device *dev = connector->dev;
713 	struct mga_device *mdev = to_mga_device(dev);
714 	int bpp = 32;
715 
716 	if (IS_G200_SE(mdev)) {
717 		u32 unique_rev_id = mdev->model.g200se.unique_rev_id;
718 
719 		if (unique_rev_id == 0x01) {
720 			if (mode->hdisplay > 1600)
721 				return MODE_VIRTUAL_X;
722 			if (mode->vdisplay > 1200)
723 				return MODE_VIRTUAL_Y;
724 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
725 				> (24400 * 1024))
726 				return MODE_BANDWIDTH;
727 		} else if (unique_rev_id == 0x02) {
728 			if (mode->hdisplay > 1920)
729 				return MODE_VIRTUAL_X;
730 			if (mode->vdisplay > 1200)
731 				return MODE_VIRTUAL_Y;
732 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
733 				> (30100 * 1024))
734 				return MODE_BANDWIDTH;
735 		} else {
736 			if (mga_vga_calculate_mode_bandwidth(mode, bpp)
737 				> (55000 * 1024))
738 				return MODE_BANDWIDTH;
739 		}
740 	} else if (mdev->type == G200_WB) {
741 		if (mode->hdisplay > 1280)
742 			return MODE_VIRTUAL_X;
743 		if (mode->vdisplay > 1024)
744 			return MODE_VIRTUAL_Y;
745 		if (mga_vga_calculate_mode_bandwidth(mode, bpp) >
746 		    (31877 * 1024))
747 			return MODE_BANDWIDTH;
748 	} else if (mdev->type == G200_EV &&
749 		(mga_vga_calculate_mode_bandwidth(mode, bpp)
750 			> (32700 * 1024))) {
751 		return MODE_BANDWIDTH;
752 	} else if (mdev->type == G200_EH &&
753 		(mga_vga_calculate_mode_bandwidth(mode, bpp)
754 			> (37500 * 1024))) {
755 		return MODE_BANDWIDTH;
756 	} else if (mdev->type == G200_ER &&
757 		(mga_vga_calculate_mode_bandwidth(mode,
758 			bpp) > (55000 * 1024))) {
759 		return MODE_BANDWIDTH;
760 	}
761 
762 	if ((mode->hdisplay % 8) != 0 || (mode->hsync_start % 8) != 0 ||
763 	    (mode->hsync_end % 8) != 0 || (mode->htotal % 8) != 0) {
764 		return MODE_H_ILLEGAL;
765 	}
766 
767 	if (mode->crtc_hdisplay > 2048 || mode->crtc_hsync_start > 4096 ||
768 	    mode->crtc_hsync_end > 4096 || mode->crtc_htotal > 4096 ||
769 	    mode->crtc_vdisplay > 2048 || mode->crtc_vsync_start > 4096 ||
770 	    mode->crtc_vsync_end > 4096 || mode->crtc_vtotal > 4096) {
771 		return MODE_BAD;
772 	}
773 
774 	/* Validate the mode input by the user */
775 	if (connector->cmdline_mode.specified) {
776 		if (connector->cmdline_mode.bpp_specified)
777 			bpp = connector->cmdline_mode.bpp;
778 	}
779 
780 	if ((mode->hdisplay * mode->vdisplay * (bpp/8)) > mdev->vram_fb_available) {
781 		if (connector->cmdline_mode.specified)
782 			connector->cmdline_mode.specified = false;
783 		return MODE_BAD;
784 	}
785 
786 	return MODE_OK;
787 }
788 
789 static void mga_connector_destroy(struct drm_connector *connector)
790 {
791 	struct mga_connector *mga_connector = to_mga_connector(connector);
792 	mgag200_i2c_destroy(mga_connector->i2c);
793 	drm_connector_cleanup(connector);
794 }
795 
796 static const struct drm_connector_helper_funcs mga_vga_connector_helper_funcs = {
797 	.get_modes  = mga_vga_get_modes,
798 	.mode_valid = mga_vga_mode_valid,
799 };
800 
801 static const struct drm_connector_funcs mga_vga_connector_funcs = {
802 	.reset                  = drm_atomic_helper_connector_reset,
803 	.fill_modes             = drm_helper_probe_single_connector_modes,
804 	.destroy                = mga_connector_destroy,
805 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
806 	.atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
807 };
808 
809 static int mgag200_vga_connector_init(struct mga_device *mdev)
810 {
811 	struct drm_device *dev = &mdev->base;
812 	struct mga_connector *mconnector = &mdev->connector;
813 	struct drm_connector *connector = &mconnector->base;
814 	struct mga_i2c_chan *i2c;
815 	int ret;
816 
817 	i2c = mgag200_i2c_create(dev);
818 	if (!i2c)
819 		drm_warn(dev, "failed to add DDC bus\n");
820 
821 	ret = drm_connector_init_with_ddc(dev, connector,
822 					  &mga_vga_connector_funcs,
823 					  DRM_MODE_CONNECTOR_VGA,
824 					  &i2c->adapter);
825 	if (ret)
826 		goto err_mgag200_i2c_destroy;
827 	drm_connector_helper_add(connector, &mga_vga_connector_helper_funcs);
828 
829 	mconnector->i2c = i2c;
830 
831 	return 0;
832 
833 err_mgag200_i2c_destroy:
834 	mgag200_i2c_destroy(i2c);
835 	return ret;
836 }
837 
838 /*
839  * Simple Display Pipe
840  */
841 
842 static enum drm_mode_status
843 mgag200_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
844 				       const struct drm_display_mode *mode)
845 {
846 	return MODE_OK;
847 }
848 
849 static void
850 mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb,
851 		      struct drm_rect *clip, const struct iosys_map *map)
852 {
853 	void __iomem *dst = mdev->vram;
854 	void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
855 
856 	dst += drm_fb_clip_offset(fb->pitches[0], fb->format, clip);
857 	drm_fb_memcpy_toio(dst, fb->pitches[0], vmap, fb, clip);
858 
859 	/* Always scanout image at VRAM offset 0 */
860 	mgag200_set_startadd(mdev, (u32)0);
861 	mgag200_set_offset(mdev, fb);
862 }
863 
864 static void
865 mgag200_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
866 				   struct drm_crtc_state *crtc_state,
867 				   struct drm_plane_state *plane_state)
868 {
869 	struct drm_crtc *crtc = &pipe->crtc;
870 	struct drm_device *dev = crtc->dev;
871 	struct mga_device *mdev = to_mga_device(dev);
872 	struct mgag200_pll *pixpll = &mdev->pixpll;
873 	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
874 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
875 	struct drm_framebuffer *fb = plane_state->fb;
876 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
877 	struct drm_rect fullscreen = {
878 		.x1 = 0,
879 		.x2 = fb->width,
880 		.y1 = 0,
881 		.y2 = fb->height,
882 	};
883 
884 	/*
885 	 * Concurrent operations could possibly trigger a call to
886 	 * drm_connector_helper_funcs.get_modes by trying to read the
887 	 * display modes. Protect access to I/O registers by acquiring
888 	 * the I/O-register lock.
889 	 */
890 	mutex_lock(&mdev->rmmio_lock);
891 
892 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
893 		mgag200_g200wb_hold_bmc(mdev);
894 
895 	mgag200_set_format_regs(mdev, fb);
896 	mgag200_set_mode_regs(mdev, adjusted_mode);
897 
898 	pixpll->funcs->update(pixpll, &mgag200_crtc_state->pixpllc);
899 
900 	if (mdev->type == G200_ER)
901 		mgag200_g200er_reset_tagfifo(mdev);
902 
903 	if (IS_G200_SE(mdev))
904 		mgag200_g200se_set_hiprilvl(mdev, adjusted_mode, fb);
905 	else if (mdev->type == G200_EV)
906 		mgag200_g200ev_set_hiprilvl(mdev);
907 
908 	if (mdev->type == G200_WB || mdev->type == G200_EW3)
909 		mgag200_g200wb_release_bmc(mdev);
910 
911 	mga_crtc_load_lut(crtc);
912 	mgag200_enable_display(mdev);
913 
914 	mgag200_handle_damage(mdev, fb, &fullscreen, &shadow_plane_state->data[0]);
915 
916 	mutex_unlock(&mdev->rmmio_lock);
917 }
918 
919 static void
920 mgag200_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
921 {
922 	struct drm_crtc *crtc = &pipe->crtc;
923 	struct mga_device *mdev = to_mga_device(crtc->dev);
924 
925 	mgag200_disable_display(mdev);
926 }
927 
928 static int
929 mgag200_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
930 				  struct drm_plane_state *plane_state,
931 				  struct drm_crtc_state *crtc_state)
932 {
933 	struct drm_plane *plane = plane_state->plane;
934 	struct drm_device *dev = plane->dev;
935 	struct mga_device *mdev = to_mga_device(dev);
936 	struct mgag200_pll *pixpll = &mdev->pixpll;
937 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
938 	struct drm_framebuffer *new_fb = plane_state->fb;
939 	struct drm_framebuffer *fb = NULL;
940 	int ret;
941 
942 	if (!new_fb)
943 		return 0;
944 
945 	if (plane->state)
946 		fb = plane->state->fb;
947 
948 	if (!fb || (fb->format != new_fb->format))
949 		crtc_state->mode_changed = true; /* update PLL settings */
950 
951 	if (crtc_state->mode_changed) {
952 		ret = pixpll->funcs->compute(pixpll, crtc_state->mode.clock,
953 					     &mgag200_crtc_state->pixpllc);
954 		if (ret)
955 			return ret;
956 	}
957 
958 	return 0;
959 }
960 
961 static void
962 mgag200_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
963 				   struct drm_plane_state *old_state)
964 {
965 	struct drm_plane *plane = &pipe->plane;
966 	struct drm_device *dev = plane->dev;
967 	struct mga_device *mdev = to_mga_device(dev);
968 	struct drm_plane_state *state = plane->state;
969 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
970 	struct drm_framebuffer *fb = state->fb;
971 	struct drm_rect damage;
972 
973 	if (!fb)
974 		return;
975 
976 	mutex_lock(&mdev->rmmio_lock);
977 
978 	if (drm_atomic_helper_damage_merged(old_state, state, &damage))
979 		mgag200_handle_damage(mdev, fb, &damage, &shadow_plane_state->data[0]);
980 
981 	mutex_unlock(&mdev->rmmio_lock);
982 }
983 
984 static struct drm_crtc_state *
985 mgag200_simple_display_pipe_duplicate_crtc_state(struct drm_simple_display_pipe *pipe)
986 {
987 	struct drm_crtc *crtc = &pipe->crtc;
988 	struct drm_crtc_state *crtc_state = crtc->state;
989 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
990 	struct mgag200_crtc_state *new_mgag200_crtc_state;
991 
992 	if (!crtc_state)
993 		return NULL;
994 
995 	new_mgag200_crtc_state = kzalloc(sizeof(*new_mgag200_crtc_state), GFP_KERNEL);
996 	if (!new_mgag200_crtc_state)
997 		return NULL;
998 	__drm_atomic_helper_crtc_duplicate_state(crtc, &new_mgag200_crtc_state->base);
999 
1000 	memcpy(&new_mgag200_crtc_state->pixpllc, &mgag200_crtc_state->pixpllc,
1001 	       sizeof(new_mgag200_crtc_state->pixpllc));
1002 
1003 	return &new_mgag200_crtc_state->base;
1004 }
1005 
1006 static void mgag200_simple_display_pipe_destroy_crtc_state(struct drm_simple_display_pipe *pipe,
1007 							   struct drm_crtc_state *crtc_state)
1008 {
1009 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
1010 
1011 	__drm_atomic_helper_crtc_destroy_state(&mgag200_crtc_state->base);
1012 	kfree(mgag200_crtc_state);
1013 }
1014 
1015 static void mgag200_simple_display_pipe_reset_crtc(struct drm_simple_display_pipe *pipe)
1016 {
1017 	struct drm_crtc *crtc = &pipe->crtc;
1018 	struct mgag200_crtc_state *mgag200_crtc_state;
1019 
1020 	if (crtc->state) {
1021 		mgag200_simple_display_pipe_destroy_crtc_state(pipe, crtc->state);
1022 		crtc->state = NULL; /* must be set to NULL here */
1023 	}
1024 
1025 	mgag200_crtc_state = kzalloc(sizeof(*mgag200_crtc_state), GFP_KERNEL);
1026 	if (!mgag200_crtc_state)
1027 		return;
1028 	__drm_atomic_helper_crtc_reset(crtc, &mgag200_crtc_state->base);
1029 }
1030 
1031 static const struct drm_simple_display_pipe_funcs
1032 mgag200_simple_display_pipe_funcs = {
1033 	.mode_valid = mgag200_simple_display_pipe_mode_valid,
1034 	.enable	    = mgag200_simple_display_pipe_enable,
1035 	.disable    = mgag200_simple_display_pipe_disable,
1036 	.check	    = mgag200_simple_display_pipe_check,
1037 	.update	    = mgag200_simple_display_pipe_update,
1038 	.reset_crtc = mgag200_simple_display_pipe_reset_crtc,
1039 	.duplicate_crtc_state = mgag200_simple_display_pipe_duplicate_crtc_state,
1040 	.destroy_crtc_state = mgag200_simple_display_pipe_destroy_crtc_state,
1041 	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
1042 };
1043 
1044 static const uint32_t mgag200_simple_display_pipe_formats[] = {
1045 	DRM_FORMAT_XRGB8888,
1046 	DRM_FORMAT_RGB565,
1047 	DRM_FORMAT_RGB888,
1048 };
1049 
1050 static const uint64_t mgag200_simple_display_pipe_fmtmods[] = {
1051 	DRM_FORMAT_MOD_LINEAR,
1052 	DRM_FORMAT_MOD_INVALID
1053 };
1054 
1055 /*
1056  * Mode config
1057  */
1058 
1059 static const struct drm_mode_config_funcs mgag200_mode_config_funcs = {
1060 	.fb_create     = drm_gem_fb_create_with_dirty,
1061 	.atomic_check  = drm_atomic_helper_check,
1062 	.atomic_commit = drm_atomic_helper_commit,
1063 };
1064 
1065 static unsigned int mgag200_preferred_depth(struct mga_device *mdev)
1066 {
1067 	if (IS_G200_SE(mdev) && mdev->vram_fb_available < (2048*1024))
1068 		return 16;
1069 	else
1070 		return 32;
1071 }
1072 
1073 int mgag200_modeset_init(struct mga_device *mdev)
1074 {
1075 	struct drm_device *dev = &mdev->base;
1076 	struct drm_connector *connector = &mdev->connector.base;
1077 	struct drm_simple_display_pipe *pipe = &mdev->display_pipe;
1078 	size_t format_count = ARRAY_SIZE(mgag200_simple_display_pipe_formats);
1079 	int ret;
1080 
1081 	mgag200_init_regs(mdev);
1082 
1083 	ret = drmm_mode_config_init(dev);
1084 	if (ret) {
1085 		drm_err(dev, "drmm_mode_config_init() failed, error %d\n",
1086 			ret);
1087 		return ret;
1088 	}
1089 
1090 	dev->mode_config.max_width = MGAG200_MAX_FB_WIDTH;
1091 	dev->mode_config.max_height = MGAG200_MAX_FB_HEIGHT;
1092 
1093 	dev->mode_config.preferred_depth = mgag200_preferred_depth(mdev);
1094 
1095 	dev->mode_config.fb_base = mdev->mc.vram_base;
1096 
1097 	dev->mode_config.funcs = &mgag200_mode_config_funcs;
1098 
1099 	ret = mgag200_vga_connector_init(mdev);
1100 	if (ret) {
1101 		drm_err(dev,
1102 			"mgag200_vga_connector_init() failed, error %d\n",
1103 			ret);
1104 		return ret;
1105 	}
1106 
1107 	ret = mgag200_pixpll_init(&mdev->pixpll, mdev);
1108 	if (ret)
1109 		return ret;
1110 
1111 	ret = drm_simple_display_pipe_init(dev, pipe,
1112 					   &mgag200_simple_display_pipe_funcs,
1113 					   mgag200_simple_display_pipe_formats,
1114 					   format_count,
1115 					   mgag200_simple_display_pipe_fmtmods,
1116 					   connector);
1117 	if (ret) {
1118 		drm_err(dev,
1119 			"drm_simple_display_pipe_init() failed, error %d\n",
1120 			ret);
1121 		return ret;
1122 	}
1123 
1124 	/* FIXME: legacy gamma tables; convert to CRTC state */
1125 	drm_mode_crtc_set_gamma_size(&pipe->crtc, MGAG200_LUT_SIZE);
1126 
1127 	drm_mode_config_reset(dev);
1128 
1129 	return 0;
1130 }
1131