kernel/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gf100.c

   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 #define gf100_clk(p) container_of((p), struct gf100_clk, base)
  25 #include "priv.h"
  26 #include "pll.h"
  27
  28 #include <subdev/bios.h>
  29 #include <subdev/bios/pll.h>
  30 #include <subdev/timer.h>
  31
  32 struct gf100_clk_info {
  33         u32 freq;
  34         u32 ssel;
  35         u32 mdiv;
  36         u32 dsrc;
  37         u32 ddiv;
  38         u32 coef;
  39 };
  40
  41 struct gf100_clk {
  42         struct nvkm_clk base;
  43         struct gf100_clk_info eng[16];
  44 };
  45
  46 static u32 read_div(struct gf100_clk *, int, u32, u32);
  47
  48 static u32
  49 read_vco(struct gf100_clk *clk, u32 dsrc)
  50 {
  51         struct nvkm_device *device = clk->base.subdev.device;
  52         u32 ssrc = nvkm_rd32(device, dsrc);
  53         if (!(ssrc & 0x00000100))
  54                 return nvkm_clk_read(&clk->base, nv_clk_src_sppll0);
  55         return nvkm_clk_read(&clk->base, nv_clk_src_sppll1);
  56 }
  57
  58 static u32
  59 read_pll(struct gf100_clk *clk, u32 pll)
  60 {
  61         struct nvkm_device *device = clk->base.subdev.device;
  62         u32 ctrl = nvkm_rd32(device, pll + 0x00);
  63         u32 coef = nvkm_rd32(device, pll + 0x04);
  64         u32 P = (coef & 0x003f0000) >> 16;
  65         u32 N = (coef & 0x0000ff00) >> 8;
  66         u32 M = (coef & 0x000000ff) >> 0;
  67         u32 sclk;
  68
  69         if (!(ctrl & 0x00000001))
  70                 return 0;
  71
  72         switch (pll) {
  73         case 0x00e800:
  74         case 0x00e820:
  75                 sclk = device->crystal;
  76                 P = 1;
  77                 break;
  78         case 0x132000:
  79                 sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrc);
  80                 break;
  81         case 0x132020:
  82                 sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrcref);
  83                 break;
  84         case 0x137000:
  85         case 0x137020:
  86         case 0x137040:
  87         case 0x1370e0:
  88                 sclk = read_div(clk, (pll & 0xff) / 0x20, 0x137120, 0x137140);
  89                 break;
  90         default:
  91                 return 0;
  92         }
  93
  94         return sclk * N / M / P;
  95 }
  96
  97 static u32
  98 read_div(struct gf100_clk *clk, int doff, u32 dsrc, u32 dctl)
  99 {
 100         struct nvkm_device *device = clk->base.subdev.device;
 101         u32 ssrc = nvkm_rd32(device, dsrc + (doff * 4));
 102         u32 sctl = nvkm_rd32(device, dctl + (doff * 4));
 103
 104         switch (ssrc & 0x00000003) {
 105         case 0:
 106                 if ((ssrc & 0x00030000) != 0x00030000)
 107                         return device->crystal;
 108                 return 108000;
 109         case 2:
 110                 return 100000;
 111         case 3:
 112                 if (sctl & 0x80000000) {
 113                         u32 sclk = read_vco(clk, dsrc + (doff * 4));
 114                         u32 sdiv = (sctl & 0x0000003f) + 2;
 115                         return (sclk * 2) / sdiv;
 116                 }
 117
 118                 return read_vco(clk, dsrc + (doff * 4));
 119         default:
 120                 return 0;
 121         }
 122 }
 123
 124 static u32
 125 read_clk(struct gf100_clk *clk, int idx)
 126 {
 127         struct nvkm_device *device = clk->base.subdev.device;
 128         u32 sctl = nvkm_rd32(device, 0x137250 + (idx * 4));
 129         u32 ssel = nvkm_rd32(device, 0x137100);
 130         u32 sclk, sdiv;
 131
 132         if (ssel & (1 << idx)) {
 133                 if (idx < 7)
 134                         sclk = read_pll(clk, 0x137000 + (idx * 0x20));
 135                 else
 136                         sclk = read_pll(clk, 0x1370e0);
 137                 sdiv = ((sctl & 0x00003f00) >> 8) + 2;
 138         } else {
 139                 sclk = read_div(clk, idx, 0x137160, 0x1371d0);
 140                 sdiv = ((sctl & 0x0000003f) >> 0) + 2;
 141         }
 142
 143         if (sctl & 0x80000000)
 144                 return (sclk * 2) / sdiv;
 145
 146         return sclk;
 147 }
 148
 149 static int
 150 gf100_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
 151 {
 152         struct gf100_clk *clk = gf100_clk(base);
 153         struct nvkm_subdev *subdev = &clk->base.subdev;
 154         struct nvkm_device *device = subdev->device;
 155
 156         switch (src) {
 157         case nv_clk_src_crystal:
 158                 return device->crystal;
 159         case nv_clk_src_href:
 160                 return 100000;
 161         case nv_clk_src_sppll0:
 162                 return read_pll(clk, 0x00e800);
 163         case nv_clk_src_sppll1:
 164                 return read_pll(clk, 0x00e820);
 165
 166         case nv_clk_src_mpllsrcref:
 167                 return read_div(clk, 0, 0x137320, 0x137330);
 168         case nv_clk_src_mpllsrc:
 169                 return read_pll(clk, 0x132020);
 170         case nv_clk_src_mpll:
 171                 return read_pll(clk, 0x132000);
 172         case nv_clk_src_mdiv:
 173                 return read_div(clk, 0, 0x137300, 0x137310);
 174         case nv_clk_src_mem:
 175                 if (nvkm_rd32(device, 0x1373f0) & 0x00000002)
 176                         return nvkm_clk_read(&clk->base, nv_clk_src_mpll);
 177                 return nvkm_clk_read(&clk->base, nv_clk_src_mdiv);
 178
 179         case nv_clk_src_gpc:
 180                 return read_clk(clk, 0x00);
 181         case nv_clk_src_rop:
 182                 return read_clk(clk, 0x01);
 183         case nv_clk_src_hubk07:
 184                 return read_clk(clk, 0x02);
 185         case nv_clk_src_hubk06:
 186                 return read_clk(clk, 0x07);
 187         case nv_clk_src_hubk01:
 188                 return read_clk(clk, 0x08);
 189         case nv_clk_src_copy:
 190                 return read_clk(clk, 0x09);
 191         case nv_clk_src_daemon:
 192                 return read_clk(clk, 0x0c);
 193         case nv_clk_src_vdec:
 194                 return read_clk(clk, 0x0e);
 195         default:
 196                 nvkm_error(subdev, "invalid clock source %d\n", src);
 197                 return -EINVAL;
 198         }
 199 }
 200
 201 static u32
 202 calc_div(struct gf100_clk *clk, int idx, u32 ref, u32 freq, u32 *ddiv)
 203 {
 204         u32 div = min((ref * 2) / freq, (u32)65);
 205         if (div < 2)
 206                 div = 2;
 207
 208         *ddiv = div - 2;
 209         return (ref * 2) / div;
 210 }
 211
 212 static u32
 213 calc_src(struct gf100_clk *clk, int idx, u32 freq, u32 *dsrc, u32 *ddiv)
 214 {
 215         u32 sclk;
 216
 217         /* use one of the fixed frequencies if possible */
 218         *ddiv = 0x00000000;
 219         switch (freq) {
 220         case  27000:
 221         case 108000:
 222                 *dsrc = 0x00000000;
 223                 if (freq == 108000)
 224                         *dsrc |= 0x00030000;
 225                 return freq;
 226         case 100000:
 227                 *dsrc = 0x00000002;
 228                 return freq;
 229         default:
 230                 *dsrc = 0x00000003;
 231                 break;
 232         }
 233
 234         /* otherwise, calculate the closest divider */
 235         sclk = read_vco(clk, 0x137160 + (idx * 4));
 236         if (idx < 7)
 237                 sclk = calc_div(clk, idx, sclk, freq, ddiv);
 238         return sclk;
 239 }
 240
 241 static u32
 242 calc_pll(struct gf100_clk *clk, int idx, u32 freq, u32 *coef)
 243 {
 244         struct nvkm_subdev *subdev = &clk->base.subdev;
 245         struct nvkm_bios *bios = subdev->device->bios;
 246         struct nvbios_pll limits;
 247         int N, M, P, ret;
 248
 249         ret = nvbios_pll_parse(bios, 0x137000 + (idx * 0x20), &limits);
 250         if (ret)
 251                 return 0;
 252
 253         limits.refclk = read_div(clk, idx, 0x137120, 0x137140);
 254         if (!limits.refclk)
 255                 return 0;
 256
 257         ret = gt215_pll_calc(subdev, &limits, freq, &N, NULL, &M, &P);
 258         if (ret <= 0)
 259                 return 0;
 260
 261         *coef = (P << 16) | (N << 8) | M;
 262         return ret;
 263 }
 264
 265 static int
 266 calc_clk(struct gf100_clk *clk, struct nvkm_cstate *cstate, int idx, int dom)
 267 {
 268         struct gf100_clk_info *info = &clk->eng[idx];
 269         u32 freq = cstate->domain[dom];
 270         u32 src0, div0, div1D, div1P = 0;
 271         u32 clk0, clk1 = 0;
 272
 273         /* invalid clock domain */
 274         if (!freq)
 275                 return 0;
 276
 277         /* first possible path, using only dividers */
 278         clk0 = calc_src(clk, idx, freq, &src0, &div0);
 279         clk0 = calc_div(clk, idx, clk0, freq, &div1D);
 280
 281         /* see if we can get any closer using PLLs */
 282         if (clk0 != freq && (0x00004387 & (1 << idx))) {
 283                 if (idx <= 7)
 284                         clk1 = calc_pll(clk, idx, freq, &info->coef);
 285                 else
 286                         clk1 = cstate->domain[nv_clk_src_hubk06];
 287                 clk1 = calc_div(clk, idx, clk1, freq, &div1P);
 288         }
 289
 290         /* select the method which gets closest to target freq */
 291         if (abs((int)freq - clk0) <= abs((int)freq - clk1)) {
 292                 info->dsrc = src0;
 293                 if (div0) {
 294                         info->ddiv |= 0x80000000;
 295                         info->ddiv |= div0 << 8;
 296                         info->ddiv |= div0;
 297                 }
 298                 if (div1D) {
 299                         info->mdiv |= 0x80000000;
 300                         info->mdiv |= div1D;
 301                 }
 302                 info->ssel = info->coef = 0;
 303                 info->freq = clk0;
 304         } else {
 305                 if (div1P) {
 306                         info->mdiv |= 0x80000000;
 307                         info->mdiv |= div1P << 8;
 308                 }
 309                 info->ssel = (1 << idx);
 310                 info->freq = clk1;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static int
 317 gf100_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
 318 {
 319         struct gf100_clk *clk = gf100_clk(base);
 320         int ret;
 321
 322         if ((ret = calc_clk(clk, cstate, 0x00, nv_clk_src_gpc)) ||
 323             (ret = calc_clk(clk, cstate, 0x01, nv_clk_src_rop)) ||
 324             (ret = calc_clk(clk, cstate, 0x02, nv_clk_src_hubk07)) ||
 325             (ret = calc_clk(clk, cstate, 0x07, nv_clk_src_hubk06)) ||
 326             (ret = calc_clk(clk, cstate, 0x08, nv_clk_src_hubk01)) ||
 327             (ret = calc_clk(clk, cstate, 0x09, nv_clk_src_copy)) ||
 328             (ret = calc_clk(clk, cstate, 0x0c, nv_clk_src_daemon)) ||
 329             (ret = calc_clk(clk, cstate, 0x0e, nv_clk_src_vdec)))
 330                 return ret;
 331
 332         return 0;
 333 }
 334
 335 static void
 336 gf100_clk_prog_0(struct gf100_clk *clk, int idx)
 337 {
 338         struct gf100_clk_info *info = &clk->eng[idx];
 339         struct nvkm_device *device = clk->base.subdev.device;
 340         if (idx < 7 && !info->ssel) {
 341                 nvkm_mask(device, 0x1371d0 + (idx * 0x04), 0x80003f3f, info->ddiv);
 342                 nvkm_wr32(device, 0x137160 + (idx * 0x04), info->dsrc);
 343         }
 344 }
 345
 346 static void
 347 gf100_clk_prog_1(struct gf100_clk *clk, int idx)
 348 {
 349         struct nvkm_device *device = clk->base.subdev.device;
 350         nvkm_mask(device, 0x137100, (1 << idx), 0x00000000);
 351         nvkm_msec(device, 2000,
 352                 if (!(nvkm_rd32(device, 0x137100) & (1 << idx)))
 353                         break;
 354         );
 355 }
 356
 357 static void
 358 gf100_clk_prog_2(struct gf100_clk *clk, int idx)
 359 {
 360         struct gf100_clk_info *info = &clk->eng[idx];
 361         struct nvkm_device *device = clk->base.subdev.device;
 362         const u32 addr = 0x137000 + (idx * 0x20);
 363         if (idx <= 7) {
 364                 nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000000);
 365                 nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000000);
 366                 if (info->coef) {
 367                         nvkm_wr32(device, addr + 0x04, info->coef);
 368                         nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000001);
 369                         nvkm_msec(device, 2000,
 370                                 if (nvkm_rd32(device, addr + 0x00) & 0x00020000)
 371                                         break;
 372                         );
 373                         nvkm_mask(device, addr + 0x00, 0x00020004, 0x00000004);
 374                 }
 375         }
 376 }
 377
 378 static void
 379 gf100_clk_prog_3(struct gf100_clk *clk, int idx)
 380 {
 381         struct gf100_clk_info *info = &clk->eng[idx];
 382         struct nvkm_device *device = clk->base.subdev.device;
 383         if (info->ssel) {
 384                 nvkm_mask(device, 0x137100, (1 << idx), info->ssel);
 385                 nvkm_msec(device, 2000,
 386                         u32 tmp = nvkm_rd32(device, 0x137100) & (1 << idx);
 387                         if (tmp == info->ssel)
 388                                 break;
 389                 );
 390         }
 391 }
 392
 393 static void
 394 gf100_clk_prog_4(struct gf100_clk *clk, int idx)
 395 {
 396         struct gf100_clk_info *info = &clk->eng[idx];
 397         struct nvkm_device *device = clk->base.subdev.device;
 398         nvkm_mask(device, 0x137250 + (idx * 0x04), 0x00003f3f, info->mdiv);
 399 }
 400
 401 static int
 402 gf100_clk_prog(struct nvkm_clk *base)
 403 {
 404         struct gf100_clk *clk = gf100_clk(base);
 405         struct {
 406                 void (*exec)(struct gf100_clk *, int);
 407         } stage[] = {
 408                 { gf100_clk_prog_0 }, /* div programming */
 409                 { gf100_clk_prog_1 }, /* select div mode */
 410                 { gf100_clk_prog_2 }, /* (maybe) program pll */
 411                 { gf100_clk_prog_3 }, /* (maybe) select pll mode */
 412                 { gf100_clk_prog_4 }, /* final divider */
 413         };
 414         int i, j;
 415
 416         for (i = 0; i < ARRAY_SIZE(stage); i++) {
 417                 for (j = 0; j < ARRAY_SIZE(clk->eng); j++) {
 418                         if (!clk->eng[j].freq)
 419                                 continue;
 420                         stage[i].exec(clk, j);
 421                 }
 422         }
 423
 424         return 0;
 425 }
 426
 427 static void
 428 gf100_clk_tidy(struct nvkm_clk *base)
 429 {
 430         struct gf100_clk *clk = gf100_clk(base);
 431         memset(clk->eng, 0x00, sizeof(clk->eng));
 432 }
 433
 434 static const struct nvkm_clk_func
 435 gf100_clk = {
 436         .read = gf100_clk_read,
 437         .calc = gf100_clk_calc,
 438         .prog = gf100_clk_prog,
 439         .tidy = gf100_clk_tidy,
 440         .domains = {
 441                 { nv_clk_src_crystal, 0xff },
 442                 { nv_clk_src_href   , 0xff },
 443                 { nv_clk_src_hubk06 , 0x00 },
 444                 { nv_clk_src_hubk01 , 0x01 },
 445                 { nv_clk_src_copy   , 0x02 },
 446                 { nv_clk_src_gpc    , 0x03, 0, "core", 2000 },
 447                 { nv_clk_src_rop    , 0x04 },
 448                 { nv_clk_src_mem    , 0x05, 0, "memory", 1000 },
 449                 { nv_clk_src_vdec   , 0x06 },
 450                 { nv_clk_src_daemon , 0x0a },
 451                 { nv_clk_src_hubk07 , 0x0b },
 452                 { nv_clk_src_max }
 453         }
 454 };
 455
 456 int
 457 gf100_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
 458 {
 459         struct gf100_clk *clk;
 460
 461         if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
 462                 return -ENOMEM;
 463         *pclk = &clk->base;
 464
 465         return nvkm_clk_ctor(&gf100_clk, device, index, false, &clk->base);
 466 }