1 /*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs
23 */
24 #include "nv50.h"
25 #include "pll.h"
26 #include "seq.h"
27
28 #include <subdev/bios.h>
29 #include <subdev/bios/pll.h>
30
31 static u32
read_div(struct nv50_clk * clk)32 read_div(struct nv50_clk *clk)
33 {
34 struct nvkm_device *device = clk->base.subdev.device;
35 switch (device->chipset) {
36 case 0x50: /* it exists, but only has bit 31, not the dividers.. */
37 case 0x84:
38 case 0x86:
39 case 0x98:
40 case 0xa0:
41 return nvkm_rd32(device, 0x004700);
42 case 0x92:
43 case 0x94:
44 case 0x96:
45 return nvkm_rd32(device, 0x004800);
46 default:
47 return 0x00000000;
48 }
49 }
50
51 static u32
read_pll_src(struct nv50_clk * clk,u32 base)52 read_pll_src(struct nv50_clk *clk, u32 base)
53 {
54 struct nvkm_subdev *subdev = &clk->base.subdev;
55 struct nvkm_device *device = subdev->device;
56 u32 coef, ref = nvkm_clk_read(&clk->base, nv_clk_src_crystal);
57 u32 rsel = nvkm_rd32(device, 0x00e18c);
58 int P, N, M, id;
59
60 switch (device->chipset) {
61 case 0x50:
62 case 0xa0:
63 switch (base) {
64 case 0x4020:
65 case 0x4028: id = !!(rsel & 0x00000004); break;
66 case 0x4008: id = !!(rsel & 0x00000008); break;
67 case 0x4030: id = 0; break;
68 default:
69 nvkm_error(subdev, "ref: bad pll %06x\n", base);
70 return 0;
71 }
72
73 coef = nvkm_rd32(device, 0x00e81c + (id * 0x0c));
74 ref *= (coef & 0x01000000) ? 2 : 4;
75 P = (coef & 0x00070000) >> 16;
76 N = ((coef & 0x0000ff00) >> 8) + 1;
77 M = ((coef & 0x000000ff) >> 0) + 1;
78 break;
79 case 0x84:
80 case 0x86:
81 case 0x92:
82 coef = nvkm_rd32(device, 0x00e81c);
83 P = (coef & 0x00070000) >> 16;
84 N = (coef & 0x0000ff00) >> 8;
85 M = (coef & 0x000000ff) >> 0;
86 break;
87 case 0x94:
88 case 0x96:
89 case 0x98:
90 rsel = nvkm_rd32(device, 0x00c050);
91 switch (base) {
92 case 0x4020: rsel = (rsel & 0x00000003) >> 0; break;
93 case 0x4008: rsel = (rsel & 0x0000000c) >> 2; break;
94 case 0x4028: rsel = (rsel & 0x00001800) >> 11; break;
95 case 0x4030: rsel = 3; break;
96 default:
97 nvkm_error(subdev, "ref: bad pll %06x\n", base);
98 return 0;
99 }
100
101 switch (rsel) {
102 case 0: id = 1; break;
103 case 1: return nvkm_clk_read(&clk->base, nv_clk_src_crystal);
104 case 2: return nvkm_clk_read(&clk->base, nv_clk_src_href);
105 case 3: id = 0; break;
106 }
107
108 coef = nvkm_rd32(device, 0x00e81c + (id * 0x28));
109 P = (nvkm_rd32(device, 0x00e824 + (id * 0x28)) >> 16) & 7;
110 P += (coef & 0x00070000) >> 16;
111 N = (coef & 0x0000ff00) >> 8;
112 M = (coef & 0x000000ff) >> 0;
113 break;
114 default:
115 BUG();
116 }
117
118 if (M)
119 return (ref * N / M) >> P;
120
121 return 0;
122 }
123
124 static u32
read_pll_ref(struct nv50_clk * clk,u32 base)125 read_pll_ref(struct nv50_clk *clk, u32 base)
126 {
127 struct nvkm_subdev *subdev = &clk->base.subdev;
128 struct nvkm_device *device = subdev->device;
129 u32 src, mast = nvkm_rd32(device, 0x00c040);
130
131 switch (base) {
132 case 0x004028:
133 src = !!(mast & 0x00200000);
134 break;
135 case 0x004020:
136 src = !!(mast & 0x00400000);
137 break;
138 case 0x004008:
139 src = !!(mast & 0x00010000);
140 break;
141 case 0x004030:
142 src = !!(mast & 0x02000000);
143 break;
144 case 0x00e810:
145 return nvkm_clk_read(&clk->base, nv_clk_src_crystal);
146 default:
147 nvkm_error(subdev, "bad pll %06x\n", base);
148 return 0;
149 }
150
151 if (src)
152 return nvkm_clk_read(&clk->base, nv_clk_src_href);
153
154 return read_pll_src(clk, base);
155 }
156
157 static u32
read_pll(struct nv50_clk * clk,u32 base)158 read_pll(struct nv50_clk *clk, u32 base)
159 {
160 struct nvkm_device *device = clk->base.subdev.device;
161 u32 mast = nvkm_rd32(device, 0x00c040);
162 u32 ctrl = nvkm_rd32(device, base + 0);
163 u32 coef = nvkm_rd32(device, base + 4);
164 u32 ref = read_pll_ref(clk, base);
165 u32 freq = 0;
166 int N1, N2, M1, M2;
167
168 if (base == 0x004028 && (mast & 0x00100000)) {
169 /* wtf, appears to only disable post-divider on gt200 */
170 if (device->chipset != 0xa0)
171 return nvkm_clk_read(&clk->base, nv_clk_src_dom6);
172 }
173
174 N2 = (coef & 0xff000000) >> 24;
175 M2 = (coef & 0x00ff0000) >> 16;
176 N1 = (coef & 0x0000ff00) >> 8;
177 M1 = (coef & 0x000000ff);
178 if ((ctrl & 0x80000000) && M1) {
179 freq = ref * N1 / M1;
180 if ((ctrl & 0x40000100) == 0x40000000) {
181 if (M2)
182 freq = freq * N2 / M2;
183 else
184 freq = 0;
185 }
186 }
187
188 return freq;
189 }
190
191 int
nv50_clk_read(struct nvkm_clk * base,enum nv_clk_src src)192 nv50_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
193 {
194 struct nv50_clk *clk = nv50_clk(base);
195 struct nvkm_subdev *subdev = &clk->base.subdev;
196 struct nvkm_device *device = subdev->device;
197 u32 mast = nvkm_rd32(device, 0x00c040);
198 u32 P = 0;
199
200 switch (src) {
201 case nv_clk_src_crystal:
202 return device->crystal;
203 case nv_clk_src_href:
204 return 100000; /* PCIE reference clock */
205 case nv_clk_src_hclk:
206 return div_u64((u64)nvkm_clk_read(&clk->base, nv_clk_src_href) * 27778, 10000);
207 case nv_clk_src_hclkm3:
208 return nvkm_clk_read(&clk->base, nv_clk_src_hclk) * 3;
209 case nv_clk_src_hclkm3d2:
210 return nvkm_clk_read(&clk->base, nv_clk_src_hclk) * 3 / 2;
211 case nv_clk_src_host:
212 switch (mast & 0x30000000) {
213 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_href);
214 case 0x10000000: break;
215 case 0x20000000: /* !0x50 */
216 case 0x30000000: return nvkm_clk_read(&clk->base, nv_clk_src_hclk);
217 }
218 break;
219 case nv_clk_src_core:
220 if (!(mast & 0x00100000))
221 P = (nvkm_rd32(device, 0x004028) & 0x00070000) >> 16;
222 switch (mast & 0x00000003) {
223 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
224 case 0x00000001: return nvkm_clk_read(&clk->base, nv_clk_src_dom6);
225 case 0x00000002: return read_pll(clk, 0x004020) >> P;
226 case 0x00000003: return read_pll(clk, 0x004028) >> P;
227 }
228 break;
229 case nv_clk_src_shader:
230 P = (nvkm_rd32(device, 0x004020) & 0x00070000) >> 16;
231 switch (mast & 0x00000030) {
232 case 0x00000000:
233 if (mast & 0x00000080)
234 return nvkm_clk_read(&clk->base, nv_clk_src_host) >> P;
235 return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
236 case 0x00000010: break;
237 case 0x00000020: return read_pll(clk, 0x004028) >> P;
238 case 0x00000030: return read_pll(clk, 0x004020) >> P;
239 }
240 break;
241 case nv_clk_src_mem:
242 P = (nvkm_rd32(device, 0x004008) & 0x00070000) >> 16;
243 if (nvkm_rd32(device, 0x004008) & 0x00000200) {
244 switch (mast & 0x0000c000) {
245 case 0x00000000:
246 return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
247 case 0x00008000:
248 case 0x0000c000:
249 return nvkm_clk_read(&clk->base, nv_clk_src_href) >> P;
250 }
251 } else {
252 return read_pll(clk, 0x004008) >> P;
253 }
254 break;
255 case nv_clk_src_vdec:
256 P = (read_div(clk) & 0x00000700) >> 8;
257 switch (device->chipset) {
258 case 0x84:
259 case 0x86:
260 case 0x92:
261 case 0x94:
262 case 0x96:
263 case 0xa0:
264 switch (mast & 0x00000c00) {
265 case 0x00000000:
266 if (device->chipset == 0xa0) /* wtf?? */
267 return nvkm_clk_read(&clk->base, nv_clk_src_core) >> P;
268 return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
269 case 0x00000400:
270 return 0;
271 case 0x00000800:
272 if (mast & 0x01000000)
273 return read_pll(clk, 0x004028) >> P;
274 return read_pll(clk, 0x004030) >> P;
275 case 0x00000c00:
276 return nvkm_clk_read(&clk->base, nv_clk_src_core) >> P;
277 }
278 break;
279 case 0x98:
280 switch (mast & 0x00000c00) {
281 case 0x00000000:
282 return nvkm_clk_read(&clk->base, nv_clk_src_core) >> P;
283 case 0x00000400:
284 return 0;
285 case 0x00000800:
286 return nvkm_clk_read(&clk->base, nv_clk_src_hclkm3d2) >> P;
287 case 0x00000c00:
288 return nvkm_clk_read(&clk->base, nv_clk_src_mem) >> P;
289 }
290 break;
291 }
292 break;
293 case nv_clk_src_dom6:
294 switch (device->chipset) {
295 case 0x50:
296 case 0xa0:
297 return read_pll(clk, 0x00e810) >> 2;
298 case 0x84:
299 case 0x86:
300 case 0x92:
301 case 0x94:
302 case 0x96:
303 case 0x98:
304 P = (read_div(clk) & 0x00000007) >> 0;
305 switch (mast & 0x0c000000) {
306 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_href);
307 case 0x04000000: break;
308 case 0x08000000: return nvkm_clk_read(&clk->base, nv_clk_src_hclk);
309 case 0x0c000000:
310 return nvkm_clk_read(&clk->base, nv_clk_src_hclkm3) >> P;
311 }
312 break;
313 default:
314 break;
315 }
316 default:
317 break;
318 }
319
320 nvkm_debug(subdev, "unknown clock source %d %08x\n", src, mast);
321 return -EINVAL;
322 }
323
324 static u32
calc_pll(struct nv50_clk * clk,u32 reg,u32 idx,int * N,int * M,int * P)325 calc_pll(struct nv50_clk *clk, u32 reg, u32 idx, int *N, int *M, int *P)
326 {
327 struct nvkm_subdev *subdev = &clk->base.subdev;
328 struct nvbios_pll pll;
329 int ret;
330
331 ret = nvbios_pll_parse(subdev->device->bios, reg, &pll);
332 if (ret)
333 return 0;
334
335 pll.vco2.max_freq = 0;
336 pll.refclk = read_pll_ref(clk, reg);
337 if (!pll.refclk)
338 return 0;
339
340 return nv04_pll_calc(subdev, &pll, idx, N, M, NULL, NULL, P);
341 }
342
343 static inline u32
calc_div(u32 src,u32 target,int * div)344 calc_div(u32 src, u32 target, int *div)
345 {
346 u32 clk0 = src, clk1 = src;
347 for (*div = 0; *div <= 7; (*div)++) {
348 if (clk0 <= target) {
349 clk1 = clk0 << (*div ? 1 : 0);
350 break;
351 }
352 clk0 >>= 1;
353 }
354
355 if (target - clk0 <= clk1 - target)
356 return clk0;
357 (*div)--;
358 return clk1;
359 }
360
361 static inline u32
clk_same(u32 a,u32 b)362 clk_same(u32 a, u32 b)
363 {
364 return ((a / 1000) == (b / 1000));
365 }
366
367 int
nv50_clk_calc(struct nvkm_clk * base,struct nvkm_cstate * cstate)368 nv50_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
369 {
370 struct nv50_clk *clk = nv50_clk(base);
371 struct nv50_clk_hwsq *hwsq = &clk->hwsq;
372 struct nvkm_subdev *subdev = &clk->base.subdev;
373 struct nvkm_device *device = subdev->device;
374 const int shader = cstate->domain[nv_clk_src_shader];
375 const int core = cstate->domain[nv_clk_src_core];
376 const int vdec = cstate->domain[nv_clk_src_vdec];
377 const int dom6 = cstate->domain[nv_clk_src_dom6];
378 u32 mastm = 0, mastv = 0;
379 u32 divsm = 0, divsv = 0;
380 int N, M, P1, P2;
381 int freq, out;
382
383 /* prepare a hwsq script from which we'll perform the reclock */
384 out = clk_init(hwsq, subdev);
385 if (out)
386 return out;
387
388 clk_wr32(hwsq, fifo, 0x00000001); /* block fifo */
389 clk_nsec(hwsq, 8000);
390 clk_setf(hwsq, 0x10, 0x00); /* disable fb */
391 clk_wait(hwsq, 0x00, 0x01); /* wait for fb disabled */
392
393 /* vdec: avoid modifying xpll until we know exactly how the other
394 * clock domains work, i suspect at least some of them can also be
395 * tied to xpll...
396 */
397 if (vdec) {
398 /* see how close we can get using nvclk as a source */
399 freq = calc_div(core, vdec, &P1);
400
401 /* see how close we can get using xpll/hclk as a source */
402 if (device->chipset != 0x98)
403 out = read_pll(clk, 0x004030);
404 else
405 out = nvkm_clk_read(&clk->base, nv_clk_src_hclkm3d2);
406 out = calc_div(out, vdec, &P2);
407
408 /* select whichever gets us closest */
409 if (abs(vdec - freq) <= abs(vdec - out)) {
410 if (device->chipset != 0x98)
411 mastv |= 0x00000c00;
412 divsv |= P1 << 8;
413 } else {
414 mastv |= 0x00000800;
415 divsv |= P2 << 8;
416 }
417
418 mastm |= 0x00000c00;
419 divsm |= 0x00000700;
420 }
421
422 /* dom6: nfi what this is, but we're limited to various combinations
423 * of the host clock frequency
424 */
425 if (dom6) {
426 if (clk_same(dom6, nvkm_clk_read(&clk->base, nv_clk_src_href))) {
427 mastv |= 0x00000000;
428 } else
429 if (clk_same(dom6, nvkm_clk_read(&clk->base, nv_clk_src_hclk))) {
430 mastv |= 0x08000000;
431 } else {
432 freq = nvkm_clk_read(&clk->base, nv_clk_src_hclk) * 3;
433 calc_div(freq, dom6, &P1);
434
435 mastv |= 0x0c000000;
436 divsv |= P1;
437 }
438
439 mastm |= 0x0c000000;
440 divsm |= 0x00000007;
441 }
442
443 /* vdec/dom6: switch to "safe" clocks temporarily, update dividers
444 * and then switch to target clocks
445 */
446 clk_mask(hwsq, mast, mastm, 0x00000000);
447 clk_mask(hwsq, divs, divsm, divsv);
448 clk_mask(hwsq, mast, mastm, mastv);
449
450 /* core/shader: disconnect nvclk/sclk from their PLLs (nvclk to dom6,
451 * sclk to hclk) before reprogramming
452 */
453 if (device->chipset < 0x92)
454 clk_mask(hwsq, mast, 0x001000b0, 0x00100080);
455 else
456 clk_mask(hwsq, mast, 0x000000b3, 0x00000081);
457
458 /* core: for the moment at least, always use nvpll */
459 freq = calc_pll(clk, 0x4028, core, &N, &M, &P1);
460 if (freq == 0)
461 return -ERANGE;
462
463 clk_mask(hwsq, nvpll[0], 0xc03f0100,
464 0x80000000 | (P1 << 19) | (P1 << 16));
465 clk_mask(hwsq, nvpll[1], 0x0000ffff, (N << 8) | M);
466
467 /* shader: tie to nvclk if possible, otherwise use spll. have to be
468 * very careful that the shader clock is at least twice the core, or
469 * some chipsets will be very unhappy. i expect most or all of these
470 * cases will be handled by tying to nvclk, but it's possible there's
471 * corners
472 */
473 if (P1-- && shader == (core << 1)) {
474 clk_mask(hwsq, spll[0], 0xc03f0100, (P1 << 19) | (P1 << 16));
475 clk_mask(hwsq, mast, 0x00100033, 0x00000023);
476 } else {
477 freq = calc_pll(clk, 0x4020, shader, &N, &M, &P1);
478 if (freq == 0)
479 return -ERANGE;
480
481 clk_mask(hwsq, spll[0], 0xc03f0100,
482 0x80000000 | (P1 << 19) | (P1 << 16));
483 clk_mask(hwsq, spll[1], 0x0000ffff, (N << 8) | M);
484 clk_mask(hwsq, mast, 0x00100033, 0x00000033);
485 }
486
487 /* restore normal operation */
488 clk_setf(hwsq, 0x10, 0x01); /* enable fb */
489 clk_wait(hwsq, 0x00, 0x00); /* wait for fb enabled */
490 clk_wr32(hwsq, fifo, 0x00000000); /* un-block fifo */
491 return 0;
492 }
493
494 int
nv50_clk_prog(struct nvkm_clk * base)495 nv50_clk_prog(struct nvkm_clk *base)
496 {
497 struct nv50_clk *clk = nv50_clk(base);
498 return clk_exec(&clk->hwsq, true);
499 }
500
501 void
nv50_clk_tidy(struct nvkm_clk * base)502 nv50_clk_tidy(struct nvkm_clk *base)
503 {
504 struct nv50_clk *clk = nv50_clk(base);
505 clk_exec(&clk->hwsq, false);
506 }
507
508 int
nv50_clk_new_(const struct nvkm_clk_func * func,struct nvkm_device * device,int index,bool allow_reclock,struct nvkm_clk ** pclk)509 nv50_clk_new_(const struct nvkm_clk_func *func, struct nvkm_device *device,
510 int index, bool allow_reclock, struct nvkm_clk **pclk)
511 {
512 struct nv50_clk *clk;
513 int ret;
514
515 if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
516 return -ENOMEM;
517 ret = nvkm_clk_ctor(func, device, index, allow_reclock, &clk->base);
518 *pclk = &clk->base;
519 if (ret)
520 return ret;
521
522 clk->hwsq.r_fifo = hwsq_reg(0x002504);
523 clk->hwsq.r_spll[0] = hwsq_reg(0x004020);
524 clk->hwsq.r_spll[1] = hwsq_reg(0x004024);
525 clk->hwsq.r_nvpll[0] = hwsq_reg(0x004028);
526 clk->hwsq.r_nvpll[1] = hwsq_reg(0x00402c);
527 switch (device->chipset) {
528 case 0x92:
529 case 0x94:
530 case 0x96:
531 clk->hwsq.r_divs = hwsq_reg(0x004800);
532 break;
533 default:
534 clk->hwsq.r_divs = hwsq_reg(0x004700);
535 break;
536 }
537 clk->hwsq.r_mast = hwsq_reg(0x00c040);
538 return 0;
539 }
540
541 static const struct nvkm_clk_func
542 nv50_clk = {
543 .read = nv50_clk_read,
544 .calc = nv50_clk_calc,
545 .prog = nv50_clk_prog,
546 .tidy = nv50_clk_tidy,
547 .domains = {
548 { nv_clk_src_crystal, 0xff },
549 { nv_clk_src_href , 0xff },
550 { nv_clk_src_core , 0xff, 0, "core", 1000 },
551 { nv_clk_src_shader , 0xff, 0, "shader", 1000 },
552 { nv_clk_src_mem , 0xff, 0, "memory", 1000 },
553 { nv_clk_src_max }
554 }
555 };
556
557 int
nv50_clk_new(struct nvkm_device * device,int index,struct nvkm_clk ** pclk)558 nv50_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
559 {
560 return nv50_clk_new_(&nv50_clk, device, index, false, pclk);
561 }
562