1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2016 Google, Inc
4  */
5 
6 #include <common.h>
7 #include <bios_emul.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <fdtdec.h>
11 #include <pci_rom.h>
12 #include <vbe.h>
13 #include <asm/intel_regs.h>
14 #include <asm/io.h>
15 #include <asm/mtrr.h>
16 #include <asm/pci.h>
17 #include <asm/arch/pch.h>
18 #include <asm/arch/sandybridge.h>
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
22 struct gt_powermeter {
23 	u16 reg;
24 	u32 value;
25 };
26 
27 /* These are magic values - unfortunately the meaning is unknown */
28 static const struct gt_powermeter snb_pm_gt1[] = {
29 	{ 0xa200, 0xcc000000 },
30 	{ 0xa204, 0x07000040 },
31 	{ 0xa208, 0x0000fe00 },
32 	{ 0xa20c, 0x00000000 },
33 	{ 0xa210, 0x17000000 },
34 	{ 0xa214, 0x00000021 },
35 	{ 0xa218, 0x0817fe19 },
36 	{ 0xa21c, 0x00000000 },
37 	{ 0xa220, 0x00000000 },
38 	{ 0xa224, 0xcc000000 },
39 	{ 0xa228, 0x07000040 },
40 	{ 0xa22c, 0x0000fe00 },
41 	{ 0xa230, 0x00000000 },
42 	{ 0xa234, 0x17000000 },
43 	{ 0xa238, 0x00000021 },
44 	{ 0xa23c, 0x0817fe19 },
45 	{ 0xa240, 0x00000000 },
46 	{ 0xa244, 0x00000000 },
47 	{ 0xa248, 0x8000421e },
48 	{ 0 }
49 };
50 
51 static const struct gt_powermeter snb_pm_gt2[] = {
52 	{ 0xa200, 0x330000a6 },
53 	{ 0xa204, 0x402d0031 },
54 	{ 0xa208, 0x00165f83 },
55 	{ 0xa20c, 0xf1000000 },
56 	{ 0xa210, 0x00000000 },
57 	{ 0xa214, 0x00160016 },
58 	{ 0xa218, 0x002a002b },
59 	{ 0xa21c, 0x00000000 },
60 	{ 0xa220, 0x00000000 },
61 	{ 0xa224, 0x330000a6 },
62 	{ 0xa228, 0x402d0031 },
63 	{ 0xa22c, 0x00165f83 },
64 	{ 0xa230, 0xf1000000 },
65 	{ 0xa234, 0x00000000 },
66 	{ 0xa238, 0x00160016 },
67 	{ 0xa23c, 0x002a002b },
68 	{ 0xa240, 0x00000000 },
69 	{ 0xa244, 0x00000000 },
70 	{ 0xa248, 0x8000421e },
71 	{ 0 }
72 };
73 
74 static const struct gt_powermeter ivb_pm_gt1[] = {
75 	{ 0xa800, 0x00000000 },
76 	{ 0xa804, 0x00021c00 },
77 	{ 0xa808, 0x00000403 },
78 	{ 0xa80c, 0x02001700 },
79 	{ 0xa810, 0x05000200 },
80 	{ 0xa814, 0x00000000 },
81 	{ 0xa818, 0x00690500 },
82 	{ 0xa81c, 0x0000007f },
83 	{ 0xa820, 0x01002501 },
84 	{ 0xa824, 0x00000300 },
85 	{ 0xa828, 0x01000331 },
86 	{ 0xa82c, 0x0000000c },
87 	{ 0xa830, 0x00010016 },
88 	{ 0xa834, 0x01100101 },
89 	{ 0xa838, 0x00010103 },
90 	{ 0xa83c, 0x00041300 },
91 	{ 0xa840, 0x00000b30 },
92 	{ 0xa844, 0x00000000 },
93 	{ 0xa848, 0x7f000000 },
94 	{ 0xa84c, 0x05000008 },
95 	{ 0xa850, 0x00000001 },
96 	{ 0xa854, 0x00000004 },
97 	{ 0xa858, 0x00000007 },
98 	{ 0xa85c, 0x00000000 },
99 	{ 0xa860, 0x00010000 },
100 	{ 0xa248, 0x0000221e },
101 	{ 0xa900, 0x00000000 },
102 	{ 0xa904, 0x00001c00 },
103 	{ 0xa908, 0x00000000 },
104 	{ 0xa90c, 0x06000000 },
105 	{ 0xa910, 0x09000200 },
106 	{ 0xa914, 0x00000000 },
107 	{ 0xa918, 0x00590000 },
108 	{ 0xa91c, 0x00000000 },
109 	{ 0xa920, 0x04002501 },
110 	{ 0xa924, 0x00000100 },
111 	{ 0xa928, 0x03000410 },
112 	{ 0xa92c, 0x00000000 },
113 	{ 0xa930, 0x00020000 },
114 	{ 0xa934, 0x02070106 },
115 	{ 0xa938, 0x00010100 },
116 	{ 0xa93c, 0x00401c00 },
117 	{ 0xa940, 0x00000000 },
118 	{ 0xa944, 0x00000000 },
119 	{ 0xa948, 0x10000e00 },
120 	{ 0xa94c, 0x02000004 },
121 	{ 0xa950, 0x00000001 },
122 	{ 0xa954, 0x00000004 },
123 	{ 0xa960, 0x00060000 },
124 	{ 0xaa3c, 0x00001c00 },
125 	{ 0xaa54, 0x00000004 },
126 	{ 0xaa60, 0x00060000 },
127 	{ 0 }
128 };
129 
130 static const struct gt_powermeter ivb_pm_gt2_17w[] = {
131 	{ 0xa800, 0x20000000 },
132 	{ 0xa804, 0x000e3800 },
133 	{ 0xa808, 0x00000806 },
134 	{ 0xa80c, 0x0c002f00 },
135 	{ 0xa810, 0x0c000800 },
136 	{ 0xa814, 0x00000000 },
137 	{ 0xa818, 0x00d20d00 },
138 	{ 0xa81c, 0x000000ff },
139 	{ 0xa820, 0x03004b02 },
140 	{ 0xa824, 0x00000600 },
141 	{ 0xa828, 0x07000773 },
142 	{ 0xa82c, 0x00000000 },
143 	{ 0xa830, 0x00020032 },
144 	{ 0xa834, 0x1520040d },
145 	{ 0xa838, 0x00020105 },
146 	{ 0xa83c, 0x00083700 },
147 	{ 0xa840, 0x000016ff },
148 	{ 0xa844, 0x00000000 },
149 	{ 0xa848, 0xff000000 },
150 	{ 0xa84c, 0x0a000010 },
151 	{ 0xa850, 0x00000002 },
152 	{ 0xa854, 0x00000008 },
153 	{ 0xa858, 0x0000000f },
154 	{ 0xa85c, 0x00000000 },
155 	{ 0xa860, 0x00020000 },
156 	{ 0xa248, 0x0000221e },
157 	{ 0xa900, 0x00000000 },
158 	{ 0xa904, 0x00003800 },
159 	{ 0xa908, 0x00000000 },
160 	{ 0xa90c, 0x0c000000 },
161 	{ 0xa910, 0x12000800 },
162 	{ 0xa914, 0x00000000 },
163 	{ 0xa918, 0x00b20000 },
164 	{ 0xa91c, 0x00000000 },
165 	{ 0xa920, 0x08004b02 },
166 	{ 0xa924, 0x00000300 },
167 	{ 0xa928, 0x01000820 },
168 	{ 0xa92c, 0x00000000 },
169 	{ 0xa930, 0x00030000 },
170 	{ 0xa934, 0x15150406 },
171 	{ 0xa938, 0x00020300 },
172 	{ 0xa93c, 0x00903900 },
173 	{ 0xa940, 0x00000000 },
174 	{ 0xa944, 0x00000000 },
175 	{ 0xa948, 0x20001b00 },
176 	{ 0xa94c, 0x0a000010 },
177 	{ 0xa950, 0x00000000 },
178 	{ 0xa954, 0x00000008 },
179 	{ 0xa960, 0x00110000 },
180 	{ 0xaa3c, 0x00003900 },
181 	{ 0xaa54, 0x00000008 },
182 	{ 0xaa60, 0x00110000 },
183 	{ 0 }
184 };
185 
186 static const struct gt_powermeter ivb_pm_gt2_35w[] = {
187 	{ 0xa800, 0x00000000 },
188 	{ 0xa804, 0x00030400 },
189 	{ 0xa808, 0x00000806 },
190 	{ 0xa80c, 0x0c002f00 },
191 	{ 0xa810, 0x0c000300 },
192 	{ 0xa814, 0x00000000 },
193 	{ 0xa818, 0x00d20d00 },
194 	{ 0xa81c, 0x000000ff },
195 	{ 0xa820, 0x03004b02 },
196 	{ 0xa824, 0x00000600 },
197 	{ 0xa828, 0x07000773 },
198 	{ 0xa82c, 0x00000000 },
199 	{ 0xa830, 0x00020032 },
200 	{ 0xa834, 0x1520040d },
201 	{ 0xa838, 0x00020105 },
202 	{ 0xa83c, 0x00083700 },
203 	{ 0xa840, 0x000016ff },
204 	{ 0xa844, 0x00000000 },
205 	{ 0xa848, 0xff000000 },
206 	{ 0xa84c, 0x0a000010 },
207 	{ 0xa850, 0x00000001 },
208 	{ 0xa854, 0x00000008 },
209 	{ 0xa858, 0x00000008 },
210 	{ 0xa85c, 0x00000000 },
211 	{ 0xa860, 0x00020000 },
212 	{ 0xa248, 0x0000221e },
213 	{ 0xa900, 0x00000000 },
214 	{ 0xa904, 0x00003800 },
215 	{ 0xa908, 0x00000000 },
216 	{ 0xa90c, 0x0c000000 },
217 	{ 0xa910, 0x12000800 },
218 	{ 0xa914, 0x00000000 },
219 	{ 0xa918, 0x00b20000 },
220 	{ 0xa91c, 0x00000000 },
221 	{ 0xa920, 0x08004b02 },
222 	{ 0xa924, 0x00000300 },
223 	{ 0xa928, 0x01000820 },
224 	{ 0xa92c, 0x00000000 },
225 	{ 0xa930, 0x00030000 },
226 	{ 0xa934, 0x15150406 },
227 	{ 0xa938, 0x00020300 },
228 	{ 0xa93c, 0x00903900 },
229 	{ 0xa940, 0x00000000 },
230 	{ 0xa944, 0x00000000 },
231 	{ 0xa948, 0x20001b00 },
232 	{ 0xa94c, 0x0a000010 },
233 	{ 0xa950, 0x00000000 },
234 	{ 0xa954, 0x00000008 },
235 	{ 0xa960, 0x00110000 },
236 	{ 0xaa3c, 0x00003900 },
237 	{ 0xaa54, 0x00000008 },
238 	{ 0xaa60, 0x00110000 },
239 	{ 0 }
240 };
241 
242 static inline u32 gtt_read(void *bar, u32 reg)
243 {
244 	return readl(bar + reg);
245 }
246 
247 static inline void gtt_write(void *bar, u32 reg, u32 data)
248 {
249 	writel(data, bar + reg);
250 }
251 
252 static void gtt_write_powermeter(void *bar, const struct gt_powermeter *pm)
253 {
254 	for (; pm && pm->reg; pm++)
255 		gtt_write(bar, pm->reg, pm->value);
256 }
257 
258 #define GTT_RETRY 1000
259 static int gtt_poll(void *bar, u32 reg, u32 mask, u32 value)
260 {
261 	unsigned try = GTT_RETRY;
262 	u32 data;
263 
264 	while (try--) {
265 		data = gtt_read(bar, reg);
266 		if ((data & mask) == value)
267 			return 1;
268 		udelay(10);
269 	}
270 
271 	printf("GT init timeout\n");
272 	return 0;
273 }
274 
275 static int gma_pm_init_pre_vbios(void *gtt_bar, int rev)
276 {
277 	u32 reg32;
278 
279 	debug("GT Power Management Init, silicon = %#x\n", rev);
280 
281 	if (rev < IVB_STEP_C0) {
282 		/* 1: Enable force wake */
283 		gtt_write(gtt_bar, 0xa18c, 0x00000001);
284 		gtt_poll(gtt_bar, 0x130090, (1 << 0), (1 << 0));
285 	} else {
286 		gtt_write(gtt_bar, 0xa180, 1 << 5);
287 		gtt_write(gtt_bar, 0xa188, 0xffff0001);
288 		gtt_poll(gtt_bar, 0x130040, (1 << 0), (1 << 0));
289 	}
290 
291 	if ((rev & BASE_REV_MASK) == BASE_REV_SNB) {
292 		/* 1d: Set GTT+0x42004 [15:14]=11 (SnB C1+) */
293 		reg32 = gtt_read(gtt_bar, 0x42004);
294 		reg32 |= (1 << 14) | (1 << 15);
295 		gtt_write(gtt_bar, 0x42004, reg32);
296 	}
297 
298 	if (rev >= IVB_STEP_A0) {
299 		/* Display Reset Acknowledge Settings */
300 		reg32 = gtt_read(gtt_bar, 0x45010);
301 		reg32 |= (1 << 1) | (1 << 0);
302 		gtt_write(gtt_bar, 0x45010, reg32);
303 	}
304 
305 	/* 2: Get GT SKU from GTT+0x911c[13] */
306 	reg32 = gtt_read(gtt_bar, 0x911c);
307 	if ((rev & BASE_REV_MASK) == BASE_REV_SNB) {
308 		if (reg32 & (1 << 13)) {
309 			debug("SNB GT1 Power Meter Weights\n");
310 			gtt_write_powermeter(gtt_bar, snb_pm_gt1);
311 		} else {
312 			debug("SNB GT2 Power Meter Weights\n");
313 			gtt_write_powermeter(gtt_bar, snb_pm_gt2);
314 		}
315 	} else {
316 		u32 unit = readl(MCHBAR_REG(0x5938)) & 0xf;
317 
318 		if (reg32 & (1 << 13)) {
319 			/* GT1 SKU */
320 			debug("IVB GT1 Power Meter Weights\n");
321 			gtt_write_powermeter(gtt_bar, ivb_pm_gt1);
322 		} else {
323 			/* GT2 SKU */
324 			u32 tdp = readl(MCHBAR_REG(0x5930)) & 0x7fff;
325 			tdp /= (1 << unit);
326 
327 			if (tdp <= 17) {
328 				/* <=17W ULV */
329 				debug("IVB GT2 17W Power Meter Weights\n");
330 				gtt_write_powermeter(gtt_bar, ivb_pm_gt2_17w);
331 			} else if ((tdp >= 25) && (tdp <= 35)) {
332 				/* 25W-35W */
333 				debug("IVB GT2 25W-35W Power Meter Weights\n");
334 				gtt_write_powermeter(gtt_bar, ivb_pm_gt2_35w);
335 			} else {
336 				/* All others */
337 				debug("IVB GT2 35W Power Meter Weights\n");
338 				gtt_write_powermeter(gtt_bar, ivb_pm_gt2_35w);
339 			}
340 		}
341 	}
342 
343 	/* 3: Gear ratio map */
344 	gtt_write(gtt_bar, 0xa004, 0x00000010);
345 
346 	/* 4: GFXPAUSE */
347 	gtt_write(gtt_bar, 0xa000, 0x00070020);
348 
349 	/* 5: Dynamic EU trip control */
350 	gtt_write(gtt_bar, 0xa080, 0x00000004);
351 
352 	/* 6: ECO bits */
353 	reg32 = gtt_read(gtt_bar, 0xa180);
354 	reg32 |= (1 << 26) | (1 << 31);
355 	/* (bit 20=1 for SNB step D1+ / IVB A0+) */
356 	if (rev >= SNB_STEP_D1)
357 		reg32 |= (1 << 20);
358 	gtt_write(gtt_bar, 0xa180, reg32);
359 
360 	/* 6a: for SnB step D2+ only */
361 	if (((rev & BASE_REV_MASK) == BASE_REV_SNB) &&
362 	    (rev >= SNB_STEP_D2)) {
363 		reg32 = gtt_read(gtt_bar, 0x9400);
364 		reg32 |= (1 << 7);
365 		gtt_write(gtt_bar, 0x9400, reg32);
366 
367 		reg32 = gtt_read(gtt_bar, 0x941c);
368 		reg32 &= 0xf;
369 		reg32 |= (1 << 1);
370 		gtt_write(gtt_bar, 0x941c, reg32);
371 		gtt_poll(gtt_bar, 0x941c, (1 << 1), (0 << 1));
372 	}
373 
374 	if ((rev & BASE_REV_MASK) == BASE_REV_IVB) {
375 		reg32 = gtt_read(gtt_bar, 0x907c);
376 		reg32 |= (1 << 16);
377 		gtt_write(gtt_bar, 0x907c, reg32);
378 
379 		/* 6b: Clocking reset controls */
380 		gtt_write(gtt_bar, 0x9424, 0x00000001);
381 	} else {
382 		/* 6b: Clocking reset controls */
383 		gtt_write(gtt_bar, 0x9424, 0x00000000);
384 	}
385 
386 	/* 7 */
387 	if (gtt_poll(gtt_bar, 0x138124, (1 << 31), (0 << 31))) {
388 		gtt_write(gtt_bar, 0x138128, 0x00000029); /* Mailbox Data */
389 		/* Mailbox Cmd for RC6 VID */
390 		gtt_write(gtt_bar, 0x138124, 0x80000004);
391 		if (gtt_poll(gtt_bar, 0x138124, (1 << 31), (0 << 31)))
392 			gtt_write(gtt_bar, 0x138124, 0x8000000a);
393 		gtt_poll(gtt_bar, 0x138124, (1 << 31), (0 << 31));
394 	}
395 
396 	/* 8 */
397 	gtt_write(gtt_bar, 0xa090, 0x00000000); /* RC Control */
398 	gtt_write(gtt_bar, 0xa098, 0x03e80000); /* RC1e Wake Rate Limit */
399 	gtt_write(gtt_bar, 0xa09c, 0x0028001e); /* RC6/6p Wake Rate Limit */
400 	gtt_write(gtt_bar, 0xa0a0, 0x0000001e); /* RC6pp Wake Rate Limit */
401 	gtt_write(gtt_bar, 0xa0a8, 0x0001e848); /* RC Evaluation Interval */
402 	gtt_write(gtt_bar, 0xa0ac, 0x00000019); /* RC Idle Hysteresis */
403 
404 	/* 9 */
405 	gtt_write(gtt_bar, 0x2054, 0x0000000a); /* Render Idle Max Count */
406 	gtt_write(gtt_bar, 0x12054, 0x0000000a); /* Video Idle Max Count */
407 	gtt_write(gtt_bar, 0x22054, 0x0000000a); /* Blitter Idle Max Count */
408 
409 	/* 10 */
410 	gtt_write(gtt_bar, 0xa0b0, 0x00000000); /* Unblock Ack to Busy */
411 	gtt_write(gtt_bar, 0xa0b4, 0x000003e8); /* RC1e Threshold */
412 	gtt_write(gtt_bar, 0xa0b8, 0x0000c350); /* RC6 Threshold */
413 	gtt_write(gtt_bar, 0xa0bc, 0x000186a0); /* RC6p Threshold */
414 	gtt_write(gtt_bar, 0xa0c0, 0x0000fa00); /* RC6pp Threshold */
415 
416 	/* 11 */
417 	gtt_write(gtt_bar, 0xa010, 0x000f4240); /* RP Down Timeout */
418 	gtt_write(gtt_bar, 0xa014, 0x12060000); /* RP Interrupt Limits */
419 	gtt_write(gtt_bar, 0xa02c, 0x00015f90); /* RP Up Threshold */
420 	gtt_write(gtt_bar, 0xa030, 0x000186a0); /* RP Down Threshold */
421 	gtt_write(gtt_bar, 0xa068, 0x000186a0); /* RP Up EI */
422 	gtt_write(gtt_bar, 0xa06c, 0x000493e0); /* RP Down EI */
423 	gtt_write(gtt_bar, 0xa070, 0x0000000a); /* RP Idle Hysteresis */
424 
425 	/* 11a: Enable Render Standby (RC6) */
426 	if ((rev & BASE_REV_MASK) == BASE_REV_IVB) {
427 		/*
428 		 * IvyBridge should also support DeepRenderStandby.
429 		 *
430 		 * Unfortunately it does not work reliably on all SKUs so
431 		 * disable it here and it can be enabled by the kernel.
432 		 */
433 		gtt_write(gtt_bar, 0xa090, 0x88040000); /* HW RC Control */
434 	} else {
435 		gtt_write(gtt_bar, 0xa090, 0x88040000); /* HW RC Control */
436 	}
437 
438 	/* 12: Normal Frequency Request */
439 	/* RPNFREQ_VAL comes from MCHBAR 0x5998 23:16 (8 bits!? use 7) */
440 	reg32 = readl(MCHBAR_REG(0x5998));
441 	reg32 >>= 16;
442 	reg32 &= 0xef;
443 	reg32 <<= 25;
444 	gtt_write(gtt_bar, 0xa008, reg32);
445 
446 	/* 13: RP Control */
447 	gtt_write(gtt_bar, 0xa024, 0x00000592);
448 
449 	/* 14: Enable PM Interrupts */
450 	gtt_write(gtt_bar, 0x4402c, 0x03000076);
451 
452 	/* Clear 0x6c024 [8:6] */
453 	reg32 = gtt_read(gtt_bar, 0x6c024);
454 	reg32 &= ~0x000001c0;
455 	gtt_write(gtt_bar, 0x6c024, reg32);
456 
457 	return 0;
458 }
459 
460 static int gma_pm_init_post_vbios(struct udevice *dev, int rev, void *gtt_bar)
461 {
462 	const void *blob = gd->fdt_blob;
463 	int node = dev_of_offset(dev);
464 	u32 reg32, cycle_delay;
465 
466 	debug("GT Power Management Init (post VBIOS)\n");
467 
468 	/* 15: Deassert Force Wake */
469 	if (rev < IVB_STEP_C0) {
470 		gtt_write(gtt_bar, 0xa18c, gtt_read(gtt_bar, 0xa18c) & ~1);
471 		gtt_poll(gtt_bar, 0x130090, (1 << 0), (0 << 0));
472 	} else {
473 		gtt_write(gtt_bar, 0xa188, 0x1fffe);
474 		if (gtt_poll(gtt_bar, 0x130040, (1 << 0), (0 << 0))) {
475 			gtt_write(gtt_bar, 0xa188,
476 				  gtt_read(gtt_bar, 0xa188) | 1);
477 		}
478 	}
479 
480 	/* 16: SW RC Control */
481 	gtt_write(gtt_bar, 0xa094, 0x00060000);
482 
483 	/* Setup Digital Port Hotplug */
484 	reg32 = gtt_read(gtt_bar, 0xc4030);
485 	if (!reg32) {
486 		u32 dp_hotplug[3];
487 
488 		if (fdtdec_get_int_array(blob, node, "intel,dp_hotplug",
489 					 dp_hotplug, ARRAY_SIZE(dp_hotplug)))
490 			return -EINVAL;
491 
492 		reg32 = (dp_hotplug[0] & 0x7) << 2;
493 		reg32 |= (dp_hotplug[0] & 0x7) << 10;
494 		reg32 |= (dp_hotplug[0] & 0x7) << 18;
495 		gtt_write(gtt_bar, 0xc4030, reg32);
496 	}
497 
498 	/* Setup Panel Power On Delays */
499 	reg32 = gtt_read(gtt_bar, 0xc7208);
500 	if (!reg32) {
501 		reg32 = (unsigned)fdtdec_get_int(blob, node,
502 						 "panel-port-select", 0) << 30;
503 		reg32 |= fdtdec_get_int(blob, node, "panel-power-up-delay", 0)
504 				<< 16;
505 		reg32 |= fdtdec_get_int(blob, node,
506 					"panel-power-backlight-on-delay", 0);
507 		gtt_write(gtt_bar, 0xc7208, reg32);
508 	}
509 
510 	/* Setup Panel Power Off Delays */
511 	reg32 = gtt_read(gtt_bar, 0xc720c);
512 	if (!reg32) {
513 		reg32 = fdtdec_get_int(blob, node, "panel-power-down-delay", 0)
514 				<< 16;
515 		reg32 |= fdtdec_get_int(blob, node,
516 					"panel-power-backlight-off-delay", 0);
517 		gtt_write(gtt_bar, 0xc720c, reg32);
518 	}
519 
520 	/* Setup Panel Power Cycle Delay */
521 	cycle_delay = fdtdec_get_int(blob, node,
522 				     "intel,panel-power-cycle-delay", 0);
523 	if (cycle_delay) {
524 		reg32 = gtt_read(gtt_bar, 0xc7210);
525 		reg32 &= ~0xff;
526 		reg32 |= cycle_delay;
527 		gtt_write(gtt_bar, 0xc7210, reg32);
528 	}
529 
530 	/* Enable Backlight if needed */
531 	reg32 = fdtdec_get_int(blob, node, "intel,cpu-backlight", 0);
532 	if (reg32) {
533 		gtt_write(gtt_bar, 0x48250, (1 << 31));
534 		gtt_write(gtt_bar, 0x48254, reg32);
535 	}
536 	reg32 = fdtdec_get_int(blob, node, "intel,pch-backlight", 0);
537 	if (reg32) {
538 		gtt_write(gtt_bar, 0xc8250, (1 << 31));
539 		gtt_write(gtt_bar, 0xc8254, reg32);
540 	}
541 
542 	return 0;
543 }
544 
545 /*
546  * Some vga option roms are used for several chipsets but they only have one
547  * PCI ID in their header. If we encounter such an option rom, we need to do
548  * the mapping ourselves.
549  */
550 
551 uint32_t board_map_oprom_vendev(uint32_t vendev)
552 {
553 	switch (vendev) {
554 	case 0x80860102:		/* GT1 Desktop */
555 	case 0x8086010a:		/* GT1 Server */
556 	case 0x80860112:		/* GT2 Desktop */
557 	case 0x80860116:		/* GT2 Mobile */
558 	case 0x80860122:		/* GT2 Desktop >=1.3GHz */
559 	case 0x80860126:		/* GT2 Mobile >=1.3GHz */
560 	case 0x80860156:                /* IVB */
561 	case 0x80860166:                /* IVB */
562 		return 0x80860106;	/* GT1 Mobile */
563 	}
564 
565 	return vendev;
566 }
567 
568 static int int15_handler(void)
569 {
570 	int res = 0;
571 
572 	debug("%s: INT15 function %04x!\n", __func__, M.x86.R_AX);
573 
574 	switch (M.x86.R_AX) {
575 	case 0x5f34:
576 		/*
577 		 * Set Panel Fitting Hook:
578 		 *  bit 2 = Graphics Stretching
579 		 *  bit 1 = Text Stretching
580 		 *  bit 0 = Centering (do not set with bit1 or bit2)
581 		 *  0     = video bios default
582 		 */
583 		M.x86.R_AX = 0x005f;
584 		M.x86.R_CL = 0x00; /* Use video bios default */
585 		res = 1;
586 		break;
587 	case 0x5f35:
588 		/*
589 		 * Boot Display Device Hook:
590 		 *  bit 0 = CRT
591 		 *  bit 1 = TV (eDP)
592 		 *  bit 2 = EFP
593 		 *  bit 3 = LFP
594 		 *  bit 4 = CRT2
595 		 *  bit 5 = TV2 (eDP)
596 		 *  bit 6 = EFP2
597 		 *  bit 7 = LFP2
598 		 */
599 		M.x86.R_AX = 0x005f;
600 		M.x86.R_CX = 0x0000; /* Use video bios default */
601 		res = 1;
602 		break;
603 	case 0x5f51:
604 		/*
605 		 * Hook to select active LFP configuration:
606 		 *  00h = No LVDS, VBIOS does not enable LVDS
607 		 *  01h = Int-LVDS, LFP driven by integrated LVDS decoder
608 		 *  02h = SVDO-LVDS, LFP driven by SVDO decoder
609 		 *  03h = eDP, LFP Driven by Int-DisplayPort encoder
610 		 */
611 		M.x86.R_AX = 0x005f;
612 		M.x86.R_CX = 0x0003; /* eDP */
613 		res = 1;
614 		break;
615 	case 0x5f70:
616 		switch (M.x86.R_CH) {
617 		case 0:
618 			/* Get Mux */
619 			M.x86.R_AX = 0x005f;
620 			M.x86.R_CX = 0x0000;
621 			res = 1;
622 			break;
623 		case 1:
624 			/* Set Mux */
625 			M.x86.R_AX = 0x005f;
626 			M.x86.R_CX = 0x0000;
627 			res = 1;
628 			break;
629 		case 2:
630 			/* Get SG/Non-SG mode */
631 			M.x86.R_AX = 0x005f;
632 			M.x86.R_CX = 0x0000;
633 			res = 1;
634 			break;
635 		default:
636 			/* Interrupt was not handled */
637 			debug("Unknown INT15 5f70 function: 0x%02x\n",
638 			      M.x86.R_CH);
639 			break;
640 		}
641 		break;
642 	case 0x5fac:
643 		res = 1;
644 		break;
645 	default:
646 		debug("Unknown INT15 function %04x!\n", M.x86.R_AX);
647 		break;
648 	}
649 	return res;
650 }
651 
652 static void sandybridge_setup_graphics(struct udevice *dev,
653 				       struct udevice *video_dev)
654 {
655 	u32 reg32;
656 	u16 reg16;
657 	u8 reg8;
658 
659 	dm_pci_read_config16(video_dev, PCI_DEVICE_ID, &reg16);
660 	switch (reg16) {
661 	case 0x0102: /* GT1 Desktop */
662 	case 0x0106: /* GT1 Mobile */
663 	case 0x010a: /* GT1 Server */
664 	case 0x0112: /* GT2 Desktop */
665 	case 0x0116: /* GT2 Mobile */
666 	case 0x0122: /* GT2 Desktop >=1.3GHz */
667 	case 0x0126: /* GT2 Mobile >=1.3GHz */
668 	case 0x0156: /* IvyBridge */
669 	case 0x0166: /* IvyBridge */
670 		break;
671 	default:
672 		debug("Graphics not supported by this CPU/chipset\n");
673 		return;
674 	}
675 
676 	debug("Initialising Graphics\n");
677 
678 	/* Setup IGD memory by setting GGC[7:3] = 1 for 32MB */
679 	dm_pci_read_config16(dev, GGC, &reg16);
680 	reg16 &= ~0x00f8;
681 	reg16 |= 1 << 3;
682 	/* Program GTT memory by setting GGC[9:8] = 2MB */
683 	reg16 &= ~0x0300;
684 	reg16 |= 2 << 8;
685 	/* Enable VGA decode */
686 	reg16 &= ~0x0002;
687 	dm_pci_write_config16(dev, GGC, reg16);
688 
689 	/* Enable 256MB aperture */
690 	dm_pci_read_config8(video_dev, MSAC, &reg8);
691 	reg8 &= ~0x06;
692 	reg8 |= 0x02;
693 	dm_pci_write_config8(video_dev, MSAC, reg8);
694 
695 	/* Erratum workarounds */
696 	reg32 = readl(MCHBAR_REG(0x5f00));
697 	reg32 |= (1 << 9) | (1 << 10);
698 	writel(reg32, MCHBAR_REG(0x5f00));
699 
700 	/* Enable SA Clock Gating */
701 	reg32 = readl(MCHBAR_REG(0x5f00));
702 	writel(reg32 | 1, MCHBAR_REG(0x5f00));
703 
704 	/* GPU RC6 workaround for sighting 366252 */
705 	reg32 = readl(MCHBAR_REG(0x5d14));
706 	reg32 |= (1 << 31);
707 	writel(reg32, MCHBAR_REG(0x5d14));
708 
709 	/* VLW */
710 	reg32 = readl(MCHBAR_REG(0x6120));
711 	reg32 &= ~(1 << 0);
712 	writel(reg32, MCHBAR_REG(0x6120));
713 
714 	reg32 = readl(MCHBAR_REG(0x5418));
715 	reg32 |= (1 << 4) | (1 << 5);
716 	writel(reg32, MCHBAR_REG(0x5418));
717 }
718 
719 static int gma_func0_init(struct udevice *dev)
720 {
721 	struct udevice *nbridge;
722 	void *gtt_bar;
723 	ulong base;
724 	u32 reg32;
725 	int ret;
726 	int rev;
727 
728 	/* Enable PCH Display Port */
729 	writew(0x0010, RCB_REG(DISPBDF));
730 	setbits_le32(RCB_REG(FD2), PCH_ENABLE_DBDF);
731 
732 	ret = uclass_first_device_err(UCLASS_NORTHBRIDGE, &nbridge);
733 	if (ret)
734 		return ret;
735 	rev = bridge_silicon_revision(nbridge);
736 	sandybridge_setup_graphics(nbridge, dev);
737 
738 	/* IGD needs to be Bus Master */
739 	dm_pci_read_config32(dev, PCI_COMMAND, &reg32);
740 	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
741 	dm_pci_write_config32(dev, PCI_COMMAND, reg32);
742 
743 	/* Use write-combining for the graphics memory, 256MB */
744 	base = dm_pci_read_bar32(dev, 2);
745 	mtrr_add_request(MTRR_TYPE_WRCOMB, base, 256 << 20);
746 	mtrr_commit(true);
747 
748 	gtt_bar = (void *)(ulong)dm_pci_read_bar32(dev, 0);
749 	debug("GT bar %p\n", gtt_bar);
750 	ret = gma_pm_init_pre_vbios(gtt_bar, rev);
751 	if (ret)
752 		return ret;
753 
754 	return rev;
755 }
756 
757 static int bd82x6x_video_probe(struct udevice *dev)
758 {
759 	void *gtt_bar;
760 	int ret, rev;
761 
762 	rev = gma_func0_init(dev);
763 	if (rev < 0)
764 		return rev;
765 	ret = vbe_setup_video(dev, int15_handler);
766 	if (ret)
767 		return ret;
768 
769 	/* Post VBIOS init */
770 	gtt_bar = (void *)(ulong)dm_pci_read_bar32(dev, 0);
771 	ret = gma_pm_init_post_vbios(dev, rev, gtt_bar);
772 	if (ret)
773 		return ret;
774 
775 	return 0;
776 }
777 
778 static const struct udevice_id bd82x6x_video_ids[] = {
779 	{ .compatible = "intel,gma" },
780 	{ }
781 };
782 
783 U_BOOT_DRIVER(bd82x6x_video) = {
784 	.name	= "bd82x6x_video",
785 	.id	= UCLASS_VIDEO,
786 	.of_match = bd82x6x_video_ids,
787 	.probe	= bd82x6x_video_probe,
788 };
789