LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk104.c

   1/*
   2 * Copyright 2013 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 gk104_clk(p) container_of((p), struct gk104_clk, base)
  25#include "priv.h"
  26#include "pll.h"
  27
  28#include <subdev/timer.h>
  29#include <subdev/bios.h>
  30#include <subdev/bios/pll.h>
  31
  32struct gk104_clk_info {
  33        u32 freq;
  34        u32 ssel;
  35        u32 mdiv;
  36        u32 dsrc;
  37        u32 ddiv;
  38        u32 coef;
  39};
  40
  41struct gk104_clk {
  42        struct nvkm_clk base;
  43        struct gk104_clk_info eng[16];
  44};
  45
  46static u32 read_div(struct gk104_clk *, int, u32, u32);
  47static u32 read_pll(struct gk104_clk *, u32);
  48
  49static u32
  50read_vco(struct gk104_clk *clk, u32 dsrc)
  51{
  52        struct nvkm_device *device = clk->base.subdev.device;
  53        u32 ssrc = nvkm_rd32(device, dsrc);
  54        if (!(ssrc & 0x00000100))
  55                return read_pll(clk, 0x00e800);
  56        return read_pll(clk, 0x00e820);
  57}
  58
  59static u32
  60read_pll(struct gk104_clk *clk, u32 pll)
  61{
  62        struct nvkm_device *device = clk->base.subdev.device;
  63        u32 ctrl = nvkm_rd32(device, pll + 0x00);
  64        u32 coef = nvkm_rd32(device, pll + 0x04);
  65        u32 P = (coef & 0x003f0000) >> 16;
  66        u32 N = (coef & 0x0000ff00) >> 8;
  67        u32 M = (coef & 0x000000ff) >> 0;
  68        u32 sclk;
  69        u16 fN = 0xf000;
  70
  71        if (!(ctrl & 0x00000001))
  72                return 0;
  73
  74        switch (pll) {
  75        case 0x00e800:
  76        case 0x00e820:
  77                sclk = device->crystal;
  78                P = 1;
  79                break;
  80        case 0x132000:
  81                sclk = read_pll(clk, 0x132020);
  82                P = (coef & 0x10000000) ? 2 : 1;
  83                break;
  84        case 0x132020:
  85                sclk = read_div(clk, 0, 0x137320, 0x137330);
  86                fN   = nvkm_rd32(device, pll + 0x10) >> 16;
  87                break;
  88        case 0x137000:
  89        case 0x137020:
  90        case 0x137040:
  91        case 0x1370e0:
  92                sclk = read_div(clk, (pll & 0xff) / 0x20, 0x137120, 0x137140);
  93                break;
  94        default:
  95                return 0;
  96        }
  97
  98        if (P == 0)
  99                P = 1;
 100
 101        sclk = (sclk * N) + (((u16)(fN + 4096) * sclk) >> 13);
 102        return sclk / (M * P);
 103}
 104
 105static u32
 106read_div(struct gk104_clk *clk, int doff, u32 dsrc, u32 dctl)
 107{
 108        struct nvkm_device *device = clk->base.subdev.device;
 109        u32 ssrc = nvkm_rd32(device, dsrc + (doff * 4));
 110        u32 sctl = nvkm_rd32(device, dctl + (doff * 4));
 111
 112        switch (ssrc & 0x00000003) {
 113        case 0:
 114                if ((ssrc & 0x00030000) != 0x00030000)
 115                        return device->crystal;
 116                return 108000;
 117        case 2:
 118                return 100000;
 119        case 3:
 120                if (sctl & 0x80000000) {
 121                        u32 sclk = read_vco(clk, dsrc + (doff * 4));
 122                        u32 sdiv = (sctl & 0x0000003f) + 2;
 123                        return (sclk * 2) / sdiv;
 124                }
 125
 126                return read_vco(clk, dsrc + (doff * 4));
 127        default:
 128                return 0;
 129        }
 130}
 131
 132static u32
 133read_mem(struct gk104_clk *clk)
 134{
 135        struct nvkm_device *device = clk->base.subdev.device;
 136        switch (nvkm_rd32(device, 0x1373f4) & 0x0000000f) {
 137        case 1: return read_pll(clk, 0x132020);
 138        case 2: return read_pll(clk, 0x132000);
 139        default:
 140                return 0;
 141        }
 142}
 143
 144static u32
 145read_clk(struct gk104_clk *clk, int idx)
 146{
 147        struct nvkm_device *device = clk->base.subdev.device;
 148        u32 sctl = nvkm_rd32(device, 0x137250 + (idx * 4));
 149        u32 sclk, sdiv;
 150
 151        if (idx < 7) {
 152                u32 ssel = nvkm_rd32(device, 0x137100);
 153                if (ssel & (1 << idx)) {
 154                        sclk = read_pll(clk, 0x137000 + (idx * 0x20));
 155                        sdiv = 1;
 156                } else {
 157                        sclk = read_div(clk, idx, 0x137160, 0x1371d0);
 158                        sdiv = 0;
 159                }
 160        } else {
 161                u32 ssrc = nvkm_rd32(device, 0x137160 + (idx * 0x04));
 162                if ((ssrc & 0x00000003) == 0x00000003) {
 163                        sclk = read_div(clk, idx, 0x137160, 0x1371d0);
 164                        if (ssrc & 0x00000100) {
 165                                if (ssrc & 0x40000000)
 166                                        sclk = read_pll(clk, 0x1370e0);
 167                                sdiv = 1;
 168                        } else {
 169                                sdiv = 0;
 170                        }
 171                } else {
 172                        sclk = read_div(clk, idx, 0x137160, 0x1371d0);
 173                        sdiv = 0;
 174                }
 175        }
 176
 177        if (sctl & 0x80000000) {
 178                if (sdiv)
 179                        sdiv = ((sctl & 0x00003f00) >> 8) + 2;
 180                else
 181                        sdiv = ((sctl & 0x0000003f) >> 0) + 2;
 182                return (sclk * 2) / sdiv;
 183        }
 184
 185        return sclk;
 186}
 187
 188static int
 189gk104_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
 190{
 191        struct gk104_clk *clk = gk104_clk(base);
 192        struct nvkm_subdev *subdev = &clk->base.subdev;
 193        struct nvkm_device *device = subdev->device;
 194
 195        switch (src) {
 196        case nv_clk_src_crystal:
 197                return device->crystal;
 198        case nv_clk_src_href:
 199                return 100000;
 200        case nv_clk_src_mem:
 201                return read_mem(clk);
 202        case nv_clk_src_gpc:
 203                return read_clk(clk, 0x00);
 204        case nv_clk_src_rop:
 205                return read_clk(clk, 0x01);
 206        case nv_clk_src_hubk07:
 207                return read_clk(clk, 0x02);
 208        case nv_clk_src_hubk06:
 209                return read_clk(clk, 0x07);
 210        case nv_clk_src_hubk01:
 211                return read_clk(clk, 0x08);
 212        case nv_clk_src_pmu:
 213                return read_clk(clk, 0x0c);
 214        case nv_clk_src_vdec:
 215                return read_clk(clk, 0x0e);
 216        default:
 217                nvkm_error(subdev, "invalid clock source %d\n", src);
 218                return -EINVAL;
 219        }
 220}
 221
 222static u32
 223calc_div(struct gk104_clk *clk, int idx, u32 ref, u32 freq, u32 *ddiv)
 224{
 225        u32 div = min((ref * 2) / freq, (u32)65);
 226        if (div < 2)
 227                div = 2;
 228
 229        *ddiv = div - 2;
 230        return (ref * 2) / div;
 231}
 232
 233static u32
 234calc_src(struct gk104_clk *clk, int idx, u32 freq, u32 *dsrc, u32 *ddiv)
 235{
 236        u32 sclk;
 237
 238        /* use one of the fixed frequencies if possible */
 239        *ddiv = 0x00000000;
 240        switch (freq) {
 241        case  27000:
 242        case 108000:
 243                *dsrc = 0x00000000;
 244                if (freq == 108000)
 245                        *dsrc |= 0x00030000;
 246                return freq;
 247        case 100000:
 248                *dsrc = 0x00000002;
 249                return freq;
 250        default:
 251                *dsrc = 0x00000003;
 252                break;
 253        }
 254
 255        /* otherwise, calculate the closest divider */
 256        sclk = read_vco(clk, 0x137160 + (idx * 4));
 257        if (idx < 7)
 258                sclk = calc_div(clk, idx, sclk, freq, ddiv);
 259        return sclk;
 260}
 261
 262static u32
 263calc_pll(struct gk104_clk *clk, int idx, u32 freq, u32 *coef)
 264{
 265        struct nvkm_subdev *subdev = &clk->base.subdev;
 266        struct nvkm_bios *bios = subdev->device->bios;
 267        struct nvbios_pll limits;
 268        int N, M, P, ret;
 269
 270        ret = nvbios_pll_parse(bios, 0x137000 + (idx * 0x20), &limits);
 271        if (ret)
 272                return 0;
 273
 274        limits.refclk = read_div(clk, idx, 0x137120, 0x137140);
 275        if (!limits.refclk)
 276                return 0;
 277
 278        ret = gt215_pll_calc(subdev, &limits, freq, &N, NULL, &M, &P);
 279        if (ret <= 0)
 280                return 0;
 281
 282        *coef = (P << 16) | (N << 8) | M;
 283        return ret;
 284}
 285
 286static int
 287calc_clk(struct gk104_clk *clk,
 288         struct nvkm_cstate *cstate, int idx, int dom)
 289{
 290        struct gk104_clk_info *info = &clk->eng[idx];
 291        u32 freq = cstate->domain[dom];
 292        u32 src0, div0, div1D, div1P = 0;
 293        u32 clk0, clk1 = 0;
 294
 295        /* invalid clock domain */
 296        if (!freq)
 297                return 0;
 298
 299        /* first possible path, using only dividers */
 300        clk0 = calc_src(clk, idx, freq, &src0, &div0);
 301        clk0 = calc_div(clk, idx, clk0, freq, &div1D);
 302
 303        /* see if we can get any closer using PLLs */
 304        if (clk0 != freq && (0x0000ff87 & (1 << idx))) {
 305                if (idx <= 7)
 306                        clk1 = calc_pll(clk, idx, freq, &info->coef);
 307                else
 308                        clk1 = cstate->domain[nv_clk_src_hubk06];
 309                clk1 = calc_div(clk, idx, clk1, freq, &div1P);
 310        }
 311
 312        /* select the method which gets closest to target freq */
 313        if (abs((int)freq - clk0) <= abs((int)freq - clk1)) {
 314                info->dsrc = src0;
 315                if (div0) {
 316                        info->ddiv |= 0x80000000;
 317                        info->ddiv |= div0;
 318                }
 319                if (div1D) {
 320                        info->mdiv |= 0x80000000;
 321                        info->mdiv |= div1D;
 322                }
 323                info->ssel = 0;
 324                info->freq = clk0;
 325        } else {
 326                if (div1P) {
 327                        info->mdiv |= 0x80000000;
 328                        info->mdiv |= div1P << 8;
 329                }
 330                info->ssel = (1 << idx);
 331                info->dsrc = 0x40000100;
 332                info->freq = clk1;
 333        }
 334
 335        return 0;
 336}
 337
 338static int
 339gk104_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
 340{
 341        struct gk104_clk *clk = gk104_clk(base);
 342        int ret;
 343
 344        if ((ret = calc_clk(clk, cstate, 0x00, nv_clk_src_gpc)) ||
 345            (ret = calc_clk(clk, cstate, 0x01, nv_clk_src_rop)) ||
 346            (ret = calc_clk(clk, cstate, 0x02, nv_clk_src_hubk07)) ||
 347            (ret = calc_clk(clk, cstate, 0x07, nv_clk_src_hubk06)) ||
 348            (ret = calc_clk(clk, cstate, 0x08, nv_clk_src_hubk01)) ||
 349            (ret = calc_clk(clk, cstate, 0x0c, nv_clk_src_pmu)) ||
 350            (ret = calc_clk(clk, cstate, 0x0e, nv_clk_src_vdec)))
 351                return ret;
 352
 353        return 0;
 354}
 355
 356static void
 357gk104_clk_prog_0(struct gk104_clk *clk, int idx)
 358{
 359        struct gk104_clk_info *info = &clk->eng[idx];
 360        struct nvkm_device *device = clk->base.subdev.device;
 361        if (!info->ssel) {
 362                nvkm_mask(device, 0x1371d0 + (idx * 0x04), 0x8000003f, info->ddiv);
 363                nvkm_wr32(device, 0x137160 + (idx * 0x04), info->dsrc);
 364        }
 365}
 366
 367static void
 368gk104_clk_prog_1_0(struct gk104_clk *clk, int idx)
 369{
 370        struct nvkm_device *device = clk->base.subdev.device;
 371        nvkm_mask(device, 0x137100, (1 << idx), 0x00000000);
 372        nvkm_msec(device, 2000,
 373                if (!(nvkm_rd32(device, 0x137100) & (1 << idx)))
 374                        break;
 375        );
 376}
 377
 378static void
 379gk104_clk_prog_1_1(struct gk104_clk *clk, int idx)
 380{
 381        struct nvkm_device *device = clk->base.subdev.device;
 382        nvkm_mask(device, 0x137160 + (idx * 0x04), 0x00000100, 0x00000000);
 383}
 384
 385static void
 386gk104_clk_prog_2(struct gk104_clk *clk, int idx)
 387{
 388        struct gk104_clk_info *info = &clk->eng[idx];
 389        struct nvkm_device *device = clk->base.subdev.device;
 390        const u32 addr = 0x137000 + (idx * 0x20);
 391        nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000000);
 392        nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000000);
 393        if (info->coef) {
 394                nvkm_wr32(device, addr + 0x04, info->coef);
 395                nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000001);
 396
 397                /* Test PLL lock */
 398                nvkm_mask(device, addr + 0x00, 0x00000010, 0x00000000);
 399                nvkm_msec(device, 2000,
 400                        if (nvkm_rd32(device, addr + 0x00) & 0x00020000)
 401                                break;
 402                );
 403                nvkm_mask(device, addr + 0x00, 0x00000010, 0x00000010);
 404
 405                /* Enable sync mode */
 406                nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000004);
 407        }
 408}
 409
 410static void
 411gk104_clk_prog_3(struct gk104_clk *clk, int idx)
 412{
 413        struct gk104_clk_info *info = &clk->eng[idx];
 414        struct nvkm_device *device = clk->base.subdev.device;
 415        if (info->ssel)
 416                nvkm_mask(device, 0x137250 + (idx * 0x04), 0x00003f00, info->mdiv);
 417        else
 418                nvkm_mask(device, 0x137250 + (idx * 0x04), 0x0000003f, info->mdiv);
 419}
 420
 421static void
 422gk104_clk_prog_4_0(struct gk104_clk *clk, int idx)
 423{
 424        struct gk104_clk_info *info = &clk->eng[idx];
 425        struct nvkm_device *device = clk->base.subdev.device;
 426        if (info->ssel) {
 427                nvkm_mask(device, 0x137100, (1 << idx), info->ssel);
 428                nvkm_msec(device, 2000,
 429                        u32 tmp = nvkm_rd32(device, 0x137100) & (1 << idx);
 430                        if (tmp == info->ssel)
 431                                break;
 432                );
 433        }
 434}
 435
 436static void
 437gk104_clk_prog_4_1(struct gk104_clk *clk, int idx)
 438{
 439        struct gk104_clk_info *info = &clk->eng[idx];
 440        struct nvkm_device *device = clk->base.subdev.device;
 441        if (info->ssel) {
 442                nvkm_mask(device, 0x137160 + (idx * 0x04), 0x40000000, 0x40000000);
 443                nvkm_mask(device, 0x137160 + (idx * 0x04), 0x00000100, 0x00000100);
 444        }
 445}
 446
 447static int
 448gk104_clk_prog(struct nvkm_clk *base)
 449{
 450        struct gk104_clk *clk = gk104_clk(base);
 451        struct {
 452                u32 mask;
 453                void (*exec)(struct gk104_clk *, int);
 454        } stage[] = {
 455                { 0x007f, gk104_clk_prog_0   }, /* div programming */
 456                { 0x007f, gk104_clk_prog_1_0 }, /* select div mode */
 457                { 0xff80, gk104_clk_prog_1_1 },
 458                { 0x00ff, gk104_clk_prog_2   }, /* (maybe) program pll */
 459                { 0xff80, gk104_clk_prog_3   }, /* final divider */
 460                { 0x007f, gk104_clk_prog_4_0 }, /* (maybe) select pll mode */
 461                { 0xff80, gk104_clk_prog_4_1 },
 462        };
 463        int i, j;
 464
 465        for (i = 0; i < ARRAY_SIZE(stage); i++) {
 466                for (j = 0; j < ARRAY_SIZE(clk->eng); j++) {
 467                        if (!(stage[i].mask & (1 << j)))
 468                                continue;
 469                        if (!clk->eng[j].freq)
 470                                continue;
 471                        stage[i].exec(clk, j);
 472                }
 473        }
 474
 475        return 0;
 476}
 477
 478static void
 479gk104_clk_tidy(struct nvkm_clk *base)
 480{
 481        struct gk104_clk *clk = gk104_clk(base);
 482        memset(clk->eng, 0x00, sizeof(clk->eng));
 483}
 484
 485static const struct nvkm_clk_func
 486gk104_clk = {
 487        .read = gk104_clk_read,
 488        .calc = gk104_clk_calc,
 489        .prog = gk104_clk_prog,
 490        .tidy = gk104_clk_tidy,
 491        .domains = {
 492                { nv_clk_src_crystal, 0xff },
 493                { nv_clk_src_href   , 0xff },
 494                { nv_clk_src_gpc    , 0x00, NVKM_CLK_DOM_FLAG_CORE, "core", 2000 },
 495                { nv_clk_src_hubk07 , 0x01, NVKM_CLK_DOM_FLAG_CORE },
 496                { nv_clk_src_rop    , 0x02, NVKM_CLK_DOM_FLAG_CORE },
 497                { nv_clk_src_mem    , 0x03, 0, "memory", 500 },
 498                { nv_clk_src_hubk06 , 0x04, NVKM_CLK_DOM_FLAG_CORE },
 499                { nv_clk_src_hubk01 , 0x05 },
 500                { nv_clk_src_vdec   , 0x06 },
 501                { nv_clk_src_pmu    , 0x07 },
 502                { nv_clk_src_max }
 503        }
 504};
 505
 506int
 507gk104_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
 508{
 509        struct gk104_clk *clk;
 510
 511        if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
 512                return -ENOMEM;
 513        *pclk = &clk->base;
 514
 515        return nvkm_clk_ctor(&gk104_clk, device, index, true, &clk->base);
 516}
 517