| 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 sclk, sctl, sdiv = 2; |
| 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 | sclk = read_vco(clk, dsrc + (doff * 4)); |
| 113 | |
| 114 | /* Memclk has doff of 0 despite its alt. location */ |
| 115 | if (doff <= 2) { |
| 116 | sctl = nvkm_rd32(device, dctl + (doff * 4)); |
| 117 | |
| 118 | if (sctl & 0x80000000) { |
| 119 | if (ssrc & 0x100) |
| 120 | sctl >>= 8; |
| 121 | |
| 122 | sdiv = (sctl & 0x3f) + 2; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | return (sclk * 2) / sdiv; |
| 127 | default: |
| 128 | return 0; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | static u32 |
| 133 | read_clk(struct gf100_clk *clk, int idx) |
| 134 | { |
| 135 | struct nvkm_device *device = clk->base.subdev.device; |
| 136 | u32 sctl = nvkm_rd32(device, 0x137250 + (idx * 4)); |
| 137 | u32 ssel = nvkm_rd32(device, 0x137100); |
| 138 | u32 sclk, sdiv; |
| 139 | |
| 140 | if (ssel & (1 << idx)) { |
| 141 | if (idx < 7) |
| 142 | sclk = read_pll(clk, 0x137000 + (idx * 0x20)); |
| 143 | else |
| 144 | sclk = read_pll(clk, 0x1370e0); |
| 145 | sdiv = ((sctl & 0x00003f00) >> 8) + 2; |
| 146 | } else { |
| 147 | sclk = read_div(clk, idx, 0x137160, 0x1371d0); |
| 148 | sdiv = ((sctl & 0x0000003f) >> 0) + 2; |
| 149 | } |
| 150 | |
| 151 | if (sctl & 0x80000000) |
| 152 | return (sclk * 2) / sdiv; |
| 153 | |
| 154 | return sclk; |
| 155 | } |
| 156 | |
| 157 | static int |
| 158 | gf100_clk_read(struct nvkm_clk *base, enum nv_clk_src src) |
| 159 | { |
| 160 | struct gf100_clk *clk = gf100_clk(base); |
| 161 | struct nvkm_subdev *subdev = &clk->base.subdev; |
| 162 | struct nvkm_device *device = subdev->device; |
| 163 | |
| 164 | switch (src) { |
| 165 | case nv_clk_src_crystal: |
| 166 | return device->crystal; |
| 167 | case nv_clk_src_href: |
| 168 | return 100000; |
| 169 | case nv_clk_src_sppll0: |
| 170 | return read_pll(clk, 0x00e800); |
| 171 | case nv_clk_src_sppll1: |
| 172 | return read_pll(clk, 0x00e820); |
| 173 | |
| 174 | case nv_clk_src_mpllsrcref: |
| 175 | return read_div(clk, 0, 0x137320, 0x137330); |
| 176 | case nv_clk_src_mpllsrc: |
| 177 | return read_pll(clk, 0x132020); |
| 178 | case nv_clk_src_mpll: |
| 179 | return read_pll(clk, 0x132000); |
| 180 | case nv_clk_src_mdiv: |
| 181 | return read_div(clk, 0, 0x137300, 0x137310); |
| 182 | case nv_clk_src_mem: |
| 183 | if (nvkm_rd32(device, 0x1373f0) & 0x00000002) |
| 184 | return nvkm_clk_read(&clk->base, nv_clk_src_mpll); |
| 185 | return nvkm_clk_read(&clk->base, nv_clk_src_mdiv); |
| 186 | |
| 187 | case nv_clk_src_gpc: |
| 188 | return read_clk(clk, 0x00); |
| 189 | case nv_clk_src_rop: |
| 190 | return read_clk(clk, 0x01); |
| 191 | case nv_clk_src_hubk07: |
| 192 | return read_clk(clk, 0x02); |
| 193 | case nv_clk_src_hubk06: |
| 194 | return read_clk(clk, 0x07); |
| 195 | case nv_clk_src_hubk01: |
| 196 | return read_clk(clk, 0x08); |
| 197 | case nv_clk_src_copy: |
| 198 | return read_clk(clk, 0x09); |
| 199 | case nv_clk_src_pmu: |
| 200 | return read_clk(clk, 0x0c); |
| 201 | case nv_clk_src_vdec: |
| 202 | return read_clk(clk, 0x0e); |
| 203 | default: |
| 204 | nvkm_error(subdev, "invalid clock source %d\n", src); |
| 205 | return -EINVAL; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | static u32 |
| 210 | calc_div(struct gf100_clk *clk, int idx, u32 ref, u32 freq, u32 *ddiv) |
| 211 | { |
| 212 | u32 div = min((ref * 2) / freq, (u32)65); |
| 213 | if (div < 2) |
| 214 | div = 2; |
| 215 | |
| 216 | *ddiv = div - 2; |
| 217 | return (ref * 2) / div; |
| 218 | } |
| 219 | |
| 220 | static u32 |
| 221 | calc_src(struct gf100_clk *clk, int idx, u32 freq, u32 *dsrc, u32 *ddiv) |
| 222 | { |
| 223 | u32 sclk; |
| 224 | |
| 225 | /* use one of the fixed frequencies if possible */ |
| 226 | *ddiv = 0x00000000; |
| 227 | switch (freq) { |
| 228 | case 27000: |
| 229 | case 108000: |
| 230 | *dsrc = 0x00000000; |
| 231 | if (freq == 108000) |
| 232 | *dsrc |= 0x00030000; |
| 233 | return freq; |
| 234 | case 100000: |
| 235 | *dsrc = 0x00000002; |
| 236 | return freq; |
| 237 | default: |
| 238 | *dsrc = 0x00000003; |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | /* otherwise, calculate the closest divider */ |
| 243 | sclk = read_vco(clk, 0x137160 + (idx * 4)); |
| 244 | if (idx < 7) |
| 245 | sclk = calc_div(clk, idx, sclk, freq, ddiv); |
| 246 | return sclk; |
| 247 | } |
| 248 | |
| 249 | static u32 |
| 250 | calc_pll(struct gf100_clk *clk, int idx, u32 freq, u32 *coef) |
| 251 | { |
| 252 | struct nvkm_subdev *subdev = &clk->base.subdev; |
| 253 | struct nvkm_bios *bios = subdev->device->bios; |
| 254 | struct nvbios_pll limits; |
| 255 | int N, M, P, ret; |
| 256 | |
| 257 | ret = nvbios_pll_parse(bios, 0x137000 + (idx * 0x20), &limits); |
| 258 | if (ret) |
| 259 | return 0; |
| 260 | |
| 261 | limits.refclk = read_div(clk, idx, 0x137120, 0x137140); |
| 262 | if (!limits.refclk) |
| 263 | return 0; |
| 264 | |
| 265 | ret = gt215_pll_calc(subdev, &limits, freq, &N, NULL, &M, &P); |
| 266 | if (ret <= 0) |
| 267 | return 0; |
| 268 | |
| 269 | *coef = (P << 16) | (N << 8) | M; |
| 270 | return ret; |
| 271 | } |
| 272 | |
| 273 | static int |
| 274 | calc_clk(struct gf100_clk *clk, struct nvkm_cstate *cstate, int idx, int dom) |
| 275 | { |
| 276 | struct gf100_clk_info *info = &clk->eng[idx]; |
| 277 | u32 freq = cstate->domain[dom]; |
| 278 | u32 src0, div0, div1D, div1P = 0; |
| 279 | u32 clk0, clk1 = 0; |
| 280 | |
| 281 | /* invalid clock domain */ |
| 282 | if (!freq) |
| 283 | return 0; |
| 284 | |
| 285 | /* first possible path, using only dividers */ |
| 286 | clk0 = calc_src(clk, idx, freq, &src0, &div0); |
| 287 | clk0 = calc_div(clk, idx, clk0, freq, &div1D); |
| 288 | |
| 289 | /* see if we can get any closer using PLLs */ |
| 290 | if (clk0 != freq && (0x00004387 & (1 << idx))) { |
| 291 | if (idx <= 7) |
| 292 | clk1 = calc_pll(clk, idx, freq, &info->coef); |
| 293 | else |
| 294 | clk1 = cstate->domain[nv_clk_src_hubk06]; |
| 295 | clk1 = calc_div(clk, idx, clk1, freq, &div1P); |
| 296 | } |
| 297 | |
| 298 | /* select the method which gets closest to target freq */ |
| 299 | if (abs((int)freq - clk0) <= abs((int)freq - clk1)) { |
| 300 | info->dsrc = src0; |
| 301 | if (div0) { |
| 302 | info->ddiv |= 0x80000000; |
| 303 | info->ddiv |= div0 << 8; |
| 304 | info->ddiv |= div0; |
| 305 | } |
| 306 | if (div1D) { |
| 307 | info->mdiv |= 0x80000000; |
| 308 | info->mdiv |= div1D; |
| 309 | } |
| 310 | info->ssel = info->coef = 0; |
| 311 | info->freq = clk0; |
| 312 | } else { |
| 313 | if (div1P) { |
| 314 | info->mdiv |= 0x80000000; |
| 315 | info->mdiv |= div1P << 8; |
| 316 | } |
| 317 | info->ssel = (1 << idx); |
| 318 | info->freq = clk1; |
| 319 | } |
| 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int |
| 325 | gf100_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate) |
| 326 | { |
| 327 | struct gf100_clk *clk = gf100_clk(base); |
| 328 | int ret; |
| 329 | |
| 330 | if ((ret = calc_clk(clk, cstate, 0x00, nv_clk_src_gpc)) || |
| 331 | (ret = calc_clk(clk, cstate, 0x01, nv_clk_src_rop)) || |
| 332 | (ret = calc_clk(clk, cstate, 0x02, nv_clk_src_hubk07)) || |
| 333 | (ret = calc_clk(clk, cstate, 0x07, nv_clk_src_hubk06)) || |
| 334 | (ret = calc_clk(clk, cstate, 0x08, nv_clk_src_hubk01)) || |
| 335 | (ret = calc_clk(clk, cstate, 0x09, nv_clk_src_copy)) || |
| 336 | (ret = calc_clk(clk, cstate, 0x0c, nv_clk_src_pmu)) || |
| 337 | (ret = calc_clk(clk, cstate, 0x0e, nv_clk_src_vdec))) |
| 338 | return ret; |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static void |
| 344 | gf100_clk_prog_0(struct gf100_clk *clk, int idx) |
| 345 | { |
| 346 | struct gf100_clk_info *info = &clk->eng[idx]; |
| 347 | struct nvkm_device *device = clk->base.subdev.device; |
| 348 | if (idx < 7 && !info->ssel) { |
| 349 | nvkm_mask(device, 0x1371d0 + (idx * 0x04), 0x80003f3f, info->ddiv); |
| 350 | nvkm_wr32(device, 0x137160 + (idx * 0x04), info->dsrc); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | static void |
| 355 | gf100_clk_prog_1(struct gf100_clk *clk, int idx) |
| 356 | { |
| 357 | struct nvkm_device *device = clk->base.subdev.device; |
| 358 | nvkm_mask(device, 0x137100, (1 << idx), 0x00000000); |
| 359 | nvkm_msec(device, 2000, |
| 360 | if (!(nvkm_rd32(device, 0x137100) & (1 << idx))) |
| 361 | break; |
| 362 | ); |
| 363 | } |
| 364 | |
| 365 | static void |
| 366 | gf100_clk_prog_2(struct gf100_clk *clk, int idx) |
| 367 | { |
| 368 | struct gf100_clk_info *info = &clk->eng[idx]; |
| 369 | struct nvkm_device *device = clk->base.subdev.device; |
| 370 | const u32 addr = 0x137000 + (idx * 0x20); |
| 371 | if (idx <= 7) { |
| 372 | nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000000); |
| 373 | nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000000); |
| 374 | if (info->coef) { |
| 375 | nvkm_wr32(device, addr + 0x04, info->coef); |
| 376 | nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000001); |
| 377 | |
| 378 | /* Test PLL lock */ |
| 379 | nvkm_mask(device, addr + 0x00, 0x00000010, 0x00000000); |
| 380 | nvkm_msec(device, 2000, |
| 381 | if (nvkm_rd32(device, addr + 0x00) & 0x00020000) |
| 382 | break; |
| 383 | ); |
| 384 | nvkm_mask(device, addr + 0x00, 0x00000010, 0x00000010); |
| 385 | |
| 386 | /* Enable sync mode */ |
| 387 | nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000004); |
| 388 | } |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | static void |
| 393 | gf100_clk_prog_3(struct gf100_clk *clk, int idx) |
| 394 | { |
| 395 | struct gf100_clk_info *info = &clk->eng[idx]; |
| 396 | struct nvkm_device *device = clk->base.subdev.device; |
| 397 | if (info->ssel) { |
| 398 | nvkm_mask(device, 0x137100, (1 << idx), info->ssel); |
| 399 | nvkm_msec(device, 2000, |
| 400 | u32 tmp = nvkm_rd32(device, 0x137100) & (1 << idx); |
| 401 | if (tmp == info->ssel) |
| 402 | break; |
| 403 | ); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | static void |
| 408 | gf100_clk_prog_4(struct gf100_clk *clk, int idx) |
| 409 | { |
| 410 | struct gf100_clk_info *info = &clk->eng[idx]; |
| 411 | struct nvkm_device *device = clk->base.subdev.device; |
| 412 | nvkm_mask(device, 0x137250 + (idx * 0x04), 0x00003f3f, info->mdiv); |
| 413 | } |
| 414 | |
| 415 | static int |
| 416 | gf100_clk_prog(struct nvkm_clk *base) |
| 417 | { |
| 418 | struct gf100_clk *clk = gf100_clk(base); |
| 419 | struct { |
| 420 | void (*exec)(struct gf100_clk *, int); |
| 421 | } stage[] = { |
| 422 | { gf100_clk_prog_0 }, /* div programming */ |
| 423 | { gf100_clk_prog_1 }, /* select div mode */ |
| 424 | { gf100_clk_prog_2 }, /* (maybe) program pll */ |
| 425 | { gf100_clk_prog_3 }, /* (maybe) select pll mode */ |
| 426 | { gf100_clk_prog_4 }, /* final divider */ |
| 427 | }; |
| 428 | int i, j; |
| 429 | |
| 430 | for (i = 0; i < ARRAY_SIZE(stage); i++) { |
| 431 | for (j = 0; j < ARRAY_SIZE(clk->eng); j++) { |
| 432 | if (!clk->eng[j].freq) |
| 433 | continue; |
| 434 | stage[i].exec(clk, j); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | static void |
| 442 | gf100_clk_tidy(struct nvkm_clk *base) |
| 443 | { |
| 444 | struct gf100_clk *clk = gf100_clk(base); |
| 445 | memset(clk->eng, 0x00, sizeof(clk->eng)); |
| 446 | } |
| 447 | |
| 448 | static const struct nvkm_clk_func |
| 449 | gf100_clk = { |
| 450 | .read = gf100_clk_read, |
| 451 | .calc = gf100_clk_calc, |
| 452 | .prog = gf100_clk_prog, |
| 453 | .tidy = gf100_clk_tidy, |
| 454 | .domains = { |
| 455 | { nv_clk_src_crystal, 0xff }, |
| 456 | { nv_clk_src_href , 0xff }, |
| 457 | { nv_clk_src_hubk06 , 0x00 }, |
| 458 | { nv_clk_src_hubk01 , 0x01 }, |
| 459 | { nv_clk_src_copy , 0x02 }, |
| 460 | { nv_clk_src_gpc , 0x03, 0, "core", 2000 }, |
| 461 | { nv_clk_src_rop , 0x04 }, |
| 462 | { nv_clk_src_mem , 0x05, 0, "memory", 1000 }, |
| 463 | { nv_clk_src_vdec , 0x06 }, |
| 464 | { nv_clk_src_pmu , 0x0a }, |
| 465 | { nv_clk_src_hubk07 , 0x0b }, |
| 466 | { nv_clk_src_max } |
| 467 | } |
| 468 | }; |
| 469 | |
| 470 | int |
| 471 | gf100_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk) |
| 472 | { |
| 473 | struct gf100_clk *clk; |
| 474 | |
| 475 | if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL))) |
| 476 | return -ENOMEM; |
| 477 | *pclk = &clk->base; |
| 478 | |
| 479 | return nvkm_clk_ctor(&gf100_clk, device, index, false, &clk->base); |
| 480 | } |