drivers/gpu/drm/nouveau/nvkm/subdev/clk/mcp77.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 mcp77_clk(p) container_of((p), struct mcp77_clk, base)
  25 #include "gt215.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 mcp77_clk {
  33         struct nvkm_clk base;
  34         enum nv_clk_src csrc, ssrc, vsrc;
  35         u32 cctrl, sctrl;
  36         u32 ccoef, scoef;
  37         u32 cpost, spost;
  38         u32 vdiv;
  39 };
  40
  41 static u32
  42 read_div(struct mcp77_clk *clk)
  43 {
  44         struct nvkm_device *device = clk->base.subdev.device;
  45         return nvkm_rd32(device, 0x004600);
  46 }
  47
  48 static u32
  49 read_pll(struct mcp77_clk *clk, u32 base)
  50 {
  51         struct nvkm_device *device = clk->base.subdev.device;
  52         u32 ctrl = nvkm_rd32(device, base + 0);
  53         u32 coef = nvkm_rd32(device, base + 4);
  54         u32 ref = nvkm_clk_read(&clk->base, nv_clk_src_href);
  55         u32 post_div = 0;
  56         u32 clock = 0;
  57         int N1, M1;
  58
  59         switch (base){
  60         case 0x4020:
  61                 post_div = 1 << ((nvkm_rd32(device, 0x4070) & 0x000f0000) >> 16);
  62                 break;
  63         case 0x4028:
  64                 post_div = (nvkm_rd32(device, 0x4040) & 0x000f0000) >> 16;
  65                 break;
  66         default:
  67                 break;
  68         }
  69
  70         N1 = (coef & 0x0000ff00) >> 8;
  71         M1 = (coef & 0x000000ff);
  72         if ((ctrl & 0x80000000) && M1) {
  73                 clock = ref * N1 / M1;
  74                 clock = clock / post_div;
  75         }
  76
  77         return clock;
  78 }
  79
  80 static int
  81 mcp77_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
  82 {
  83         struct mcp77_clk *clk = mcp77_clk(base);
  84         struct nvkm_subdev *subdev = &clk->base.subdev;
  85         struct nvkm_device *device = subdev->device;
  86         u32 mast = nvkm_rd32(device, 0x00c054);
  87         u32 P = 0;
  88
  89         switch (src) {
  90         case nv_clk_src_crystal:
  91                 return device->crystal;
  92         case nv_clk_src_href:
  93                 return 100000; /* PCIE reference clock */
  94         case nv_clk_src_hclkm4:
  95                 return nvkm_clk_read(&clk->base, nv_clk_src_href) * 4;
  96         case nv_clk_src_hclkm2d3:
  97                 return nvkm_clk_read(&clk->base, nv_clk_src_href) * 2 / 3;
  98         case nv_clk_src_host:
  99                 switch (mast & 0x000c0000) {
 100                 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_hclkm2d3);
 101                 case 0x00040000: break;
 102                 case 0x00080000: return nvkm_clk_read(&clk->base, nv_clk_src_hclkm4);
 103                 case 0x000c0000: return nvkm_clk_read(&clk->base, nv_clk_src_cclk);
 104                 }
 105                 break;
 106         case nv_clk_src_core:
 107                 P = (nvkm_rd32(device, 0x004028) & 0x00070000) >> 16;
 108
 109                 switch (mast & 0x00000003) {
 110                 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
 111                 case 0x00000001: return 0;
 112                 case 0x00000002: return nvkm_clk_read(&clk->base, nv_clk_src_hclkm4) >> P;
 113                 case 0x00000003: return read_pll(clk, 0x004028) >> P;
 114                 }
 115                 break;
 116         case nv_clk_src_cclk:
 117                 if ((mast & 0x03000000) != 0x03000000)
 118                         return nvkm_clk_read(&clk->base, nv_clk_src_core);
 119
 120                 if ((mast & 0x00000200) == 0x00000000)
 121                         return nvkm_clk_read(&clk->base, nv_clk_src_core);
 122
 123                 switch (mast & 0x00000c00) {
 124                 case 0x00000000: return nvkm_clk_read(&clk->base, nv_clk_src_href);
 125                 case 0x00000400: return nvkm_clk_read(&clk->base, nv_clk_src_hclkm4);
 126                 case 0x00000800: return nvkm_clk_read(&clk->base, nv_clk_src_hclkm2d3);
 127                 default: return 0;
 128                 }
 129         case nv_clk_src_shader:
 130                 P = (nvkm_rd32(device, 0x004020) & 0x00070000) >> 16;
 131                 switch (mast & 0x00000030) {
 132                 case 0x00000000:
 133                         if (mast & 0x00000040)
 134                                 return nvkm_clk_read(&clk->base, nv_clk_src_href) >> P;
 135                         return nvkm_clk_read(&clk->base, nv_clk_src_crystal) >> P;
 136                 case 0x00000010: break;
 137                 case 0x00000020: return read_pll(clk, 0x004028) >> P;
 138                 case 0x00000030: return read_pll(clk, 0x004020) >> P;
 139                 }
 140                 break;
 141         case nv_clk_src_mem:
 142                 return 0;
 143                 break;
 144         case nv_clk_src_vdec:
 145                 P = (read_div(clk) & 0x00000700) >> 8;
 146
 147                 switch (mast & 0x00400000) {
 148                 case 0x00400000:
 149                         return nvkm_clk_read(&clk->base, nv_clk_src_core) >> P;
 150                         break;
 151                 default:
 152                         return 500000 >> P;
 153                         break;
 154                 }
 155                 break;
 156         default:
 157                 break;
 158         }
 159
 160         nvkm_debug(subdev, "unknown clock source %d %08x\n", src, mast);
 161         return 0;
 162 }
 163
 164 static u32
 165 calc_pll(struct mcp77_clk *clk, u32 reg,
 166          u32 clock, int *N, int *M, int *P)
 167 {
 168         struct nvkm_subdev *subdev = &clk->base.subdev;
 169         struct nvbios_pll pll;
 170         int ret;
 171
 172         ret = nvbios_pll_parse(subdev->device->bios, reg, &pll);
 173         if (ret)
 174                 return 0;
 175
 176         pll.vco2.max_freq = 0;
 177         pll.refclk = nvkm_clk_read(&clk->base, nv_clk_src_href);
 178         if (!pll.refclk)
 179                 return 0;
 180
 181         return nv04_pll_calc(subdev, &pll, clock, N, M, NULL, NULL, P);
 182 }
 183
 184 static inline u32
 185 calc_P(u32 src, u32 target, int *div)
 186 {
 187         u32 clk0 = src, clk1 = src;
 188         for (*div = 0; *div <= 7; (*div)++) {
 189                 if (clk0 <= target) {
 190                         clk1 = clk0 << (*div ? 1 : 0);
 191                         break;
 192                 }
 193                 clk0 >>= 1;
 194         }
 195
 196         if (target - clk0 <= clk1 - target)
 197                 return clk0;
 198         (*div)--;
 199         return clk1;
 200 }
 201
 202 static int
 203 mcp77_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
 204 {
 205         struct mcp77_clk *clk = mcp77_clk(base);
 206         const int shader = cstate->domain[nv_clk_src_shader];
 207         const int core = cstate->domain[nv_clk_src_core];
 208         const int vdec = cstate->domain[nv_clk_src_vdec];
 209         struct nvkm_subdev *subdev = &clk->base.subdev;
 210         u32 out = 0, clock = 0;
 211         int N, M, P1, P2 = 0;
 212         int divs = 0;
 213
 214         /* cclk: find suitable source, disable PLL if we can */
 215         if (core < nvkm_clk_read(&clk->base, nv_clk_src_hclkm4))
 216                 out = calc_P(nvkm_clk_read(&clk->base, nv_clk_src_hclkm4), core, &divs);
 217
 218         /* Calculate clock * 2, so shader clock can use it too */
 219         clock = calc_pll(clk, 0x4028, (core << 1), &N, &M, &P1);
 220
 221         if (abs(core - out) <= abs(core - (clock >> 1))) {
 222                 clk->csrc = nv_clk_src_hclkm4;
 223                 clk->cctrl = divs << 16;
 224         } else {
 225                 /* NVCTRL is actually used _after_ NVPOST, and after what we
 226                  * call NVPLL. To make matters worse, NVPOST is an integer
 227                  * divider instead of a right-shift number. */
 228                 if(P1 > 2) {
 229                         P2 = P1 - 2;
 230                         P1 = 2;
 231                 }
 232
 233                 clk->csrc = nv_clk_src_core;
 234                 clk->ccoef = (N << 8) | M;
 235
 236                 clk->cctrl = (P2 + 1) << 16;
 237                 clk->cpost = (1 << P1) << 16;
 238         }
 239
 240         /* sclk: nvpll + divisor, href or spll */
 241         out = 0;
 242         if (shader == nvkm_clk_read(&clk->base, nv_clk_src_href)) {
 243                 clk->ssrc = nv_clk_src_href;
 244         } else {
 245                 clock = calc_pll(clk, 0x4020, shader, &N, &M, &P1);
 246                 if (clk->csrc == nv_clk_src_core)
 247                         out = calc_P((core << 1), shader, &divs);
 248
 249                 if (abs(shader - out) <=
 250                     abs(shader - clock) &&
 251                    (divs + P2) <= 7) {
 252                         clk->ssrc = nv_clk_src_core;
 253                         clk->sctrl = (divs + P2) << 16;
 254                 } else {
 255                         clk->ssrc = nv_clk_src_shader;
 256                         clk->scoef = (N << 8) | M;
 257                         clk->sctrl = P1 << 16;
 258                 }
 259         }
 260
 261         /* vclk */
 262         out = calc_P(core, vdec, &divs);
 263         clock = calc_P(500000, vdec, &P1);
 264         if(abs(vdec - out) <= abs(vdec - clock)) {
 265                 clk->vsrc = nv_clk_src_cclk;
 266                 clk->vdiv = divs << 16;
 267         } else {
 268                 clk->vsrc = nv_clk_src_vdec;
 269                 clk->vdiv = P1 << 16;
 270         }
 271
 272         /* Print strategy! */
 273         nvkm_debug(subdev, "nvpll: %08x %08x %08x\n",
 274                    clk->ccoef, clk->cpost, clk->cctrl);
 275         nvkm_debug(subdev, " spll: %08x %08x %08x\n",
 276                    clk->scoef, clk->spost, clk->sctrl);
 277         nvkm_debug(subdev, " vdiv: %08x\n", clk->vdiv);
 278         if (clk->csrc == nv_clk_src_hclkm4)
 279                 nvkm_debug(subdev, "core: hrefm4\n");
 280         else
 281                 nvkm_debug(subdev, "core: nvpll\n");
 282
 283         if (clk->ssrc == nv_clk_src_hclkm4)
 284                 nvkm_debug(subdev, "shader: hrefm4\n");
 285         else if (clk->ssrc == nv_clk_src_core)
 286                 nvkm_debug(subdev, "shader: nvpll\n");
 287         else
 288                 nvkm_debug(subdev, "shader: spll\n");
 289
 290         if (clk->vsrc == nv_clk_src_hclkm4)
 291                 nvkm_debug(subdev, "vdec: 500MHz\n");
 292         else
 293                 nvkm_debug(subdev, "vdec: core\n");
 294
 295         return 0;
 296 }
 297
 298 static int
 299 mcp77_clk_prog(struct nvkm_clk *base)
 300 {
 301         struct mcp77_clk *clk = mcp77_clk(base);
 302         struct nvkm_subdev *subdev = &clk->base.subdev;
 303         struct nvkm_device *device = subdev->device;
 304         u32 pllmask = 0, mast;
 305         unsigned long flags;
 306         unsigned long *f = &flags;
 307         int ret = 0;
 308
 309         ret = gt215_clk_pre(&clk->base, f);
 310         if (ret)
 311                 goto out;
 312
 313         /* First switch to safe clocks: href */
 314         mast = nvkm_mask(device, 0xc054, 0x03400e70, 0x03400640);
 315         mast &= ~0x00400e73;
 316         mast |= 0x03000000;
 317
 318         switch (clk->csrc) {
 319         case nv_clk_src_hclkm4:
 320                 nvkm_mask(device, 0x4028, 0x00070000, clk->cctrl);
 321                 mast |= 0x00000002;
 322                 break;
 323         case nv_clk_src_core:
 324                 nvkm_wr32(device, 0x402c, clk->ccoef);
 325                 nvkm_wr32(device, 0x4028, 0x80000000 | clk->cctrl);
 326                 nvkm_wr32(device, 0x4040, clk->cpost);
 327                 pllmask |= (0x3 << 8);
 328                 mast |= 0x00000003;
 329                 break;
 330         default:
 331                 nvkm_warn(subdev, "Reclocking failed: unknown core clock\n");
 332                 goto resume;
 333         }
 334
 335         switch (clk->ssrc) {
 336         case nv_clk_src_href:
 337                 nvkm_mask(device, 0x4020, 0x00070000, 0x00000000);
 338                 /* mast |= 0x00000000; */
 339                 break;
 340         case nv_clk_src_core:
 341                 nvkm_mask(device, 0x4020, 0x00070000, clk->sctrl);
 342                 mast |= 0x00000020;
 343                 break;
 344         case nv_clk_src_shader:
 345                 nvkm_wr32(device, 0x4024, clk->scoef);
 346                 nvkm_wr32(device, 0x4020, 0x80000000 | clk->sctrl);
 347                 nvkm_wr32(device, 0x4070, clk->spost);
 348                 pllmask |= (0x3 << 12);
 349                 mast |= 0x00000030;
 350                 break;
 351         default:
 352                 nvkm_warn(subdev, "Reclocking failed: unknown sclk clock\n");
 353                 goto resume;
 354         }
 355
 356         if (nvkm_msec(device, 2000,
 357                 u32 tmp = nvkm_rd32(device, 0x004080) & pllmask;
 358                 if (tmp == pllmask)
 359                         break;
 360         ) < 0)
 361                 goto resume;
 362
 363         switch (clk->vsrc) {
 364         case nv_clk_src_cclk:
 365                 mast |= 0x00400000;
 366                 /* fall through */
 367         default:
 368                 nvkm_wr32(device, 0x4600, clk->vdiv);
 369         }
 370
 371         nvkm_wr32(device, 0xc054, mast);
 372
 373 resume:
 374         /* Disable some PLLs and dividers when unused */
 375         if (clk->csrc != nv_clk_src_core) {
 376                 nvkm_wr32(device, 0x4040, 0x00000000);
 377                 nvkm_mask(device, 0x4028, 0x80000000, 0x00000000);
 378         }
 379
 380         if (clk->ssrc != nv_clk_src_shader) {
 381                 nvkm_wr32(device, 0x4070, 0x00000000);
 382                 nvkm_mask(device, 0x4020, 0x80000000, 0x00000000);
 383         }
 384
 385 out:
 386         if (ret == -EBUSY)
 387                 f = NULL;
 388
 389         gt215_clk_post(&clk->base, f);
 390         return ret;
 391 }
 392
 393 static void
 394 mcp77_clk_tidy(struct nvkm_clk *base)
 395 {
 396 }
 397
 398 static const struct nvkm_clk_func
 399 mcp77_clk = {
 400         .read = mcp77_clk_read,
 401         .calc = mcp77_clk_calc,
 402         .prog = mcp77_clk_prog,
 403         .tidy = mcp77_clk_tidy,
 404         .domains = {
 405                 { nv_clk_src_crystal, 0xff },
 406                 { nv_clk_src_href   , 0xff },
 407                 { nv_clk_src_core   , 0xff, 0, "core", 1000 },
 408                 { nv_clk_src_shader , 0xff, 0, "shader", 1000 },
 409                 { nv_clk_src_vdec   , 0xff, 0, "vdec", 1000 },
 410                 { nv_clk_src_max }
 411         }
 412 };
 413
 414 int
 415 mcp77_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
 416 {
 417         struct mcp77_clk *clk;
 418
 419         if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
 420                 return -ENOMEM;
 421         *pclk = &clk->base;
 422
 423         return nvkm_clk_ctor(&mcp77_clk, device, index, true, &clk->base);
 424 }