| 1 | /* $NetBSD: nouveau_subdev_clock_nvaa.c,v 1.1.1.1 2014/08/06 12:36:29 riastradh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2012 Red Hat Inc. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
| 23 | * |
| 24 | * Authors: Ben Skeggs |
| 25 | */ |
| 26 | |
| 27 | #include <sys/cdefs.h> |
| 28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_clock_nvaa.c,v 1.1.1.1 2014/08/06 12:36:29 riastradh Exp $" ); |
| 29 | |
| 30 | #include <engine/fifo.h> |
| 31 | #include <subdev/bios.h> |
| 32 | #include <subdev/bios/pll.h> |
| 33 | #include <subdev/timer.h> |
| 34 | #include <subdev/clock.h> |
| 35 | |
| 36 | #include "pll.h" |
| 37 | |
| 38 | struct nvaa_clock_priv { |
| 39 | struct nouveau_clock base; |
| 40 | enum nv_clk_src csrc, ssrc, vsrc; |
| 41 | u32 cctrl, sctrl; |
| 42 | u32 ccoef, scoef; |
| 43 | u32 cpost, spost; |
| 44 | u32 vdiv; |
| 45 | }; |
| 46 | |
| 47 | static u32 |
| 48 | read_div(struct nouveau_clock *clk) |
| 49 | { |
| 50 | return nv_rd32(clk, 0x004600); |
| 51 | } |
| 52 | |
| 53 | static u32 |
| 54 | read_pll(struct nouveau_clock *clk, u32 base) |
| 55 | { |
| 56 | u32 ctrl = nv_rd32(clk, base + 0); |
| 57 | u32 coef = nv_rd32(clk, base + 4); |
| 58 | u32 ref = clk->read(clk, nv_clk_src_href); |
| 59 | u32 post_div = 0; |
| 60 | u32 clock = 0; |
| 61 | int N1, M1; |
| 62 | |
| 63 | switch (base){ |
| 64 | case 0x4020: |
| 65 | post_div = 1 << ((nv_rd32(clk, 0x4070) & 0x000f0000) >> 16); |
| 66 | break; |
| 67 | case 0x4028: |
| 68 | post_div = (nv_rd32(clk, 0x4040) & 0x000f0000) >> 16; |
| 69 | break; |
| 70 | default: |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | N1 = (coef & 0x0000ff00) >> 8; |
| 75 | M1 = (coef & 0x000000ff); |
| 76 | if ((ctrl & 0x80000000) && M1) { |
| 77 | clock = ref * N1 / M1; |
| 78 | clock = clock / post_div; |
| 79 | } |
| 80 | |
| 81 | return clock; |
| 82 | } |
| 83 | |
| 84 | static int |
| 85 | nvaa_clock_read(struct nouveau_clock *clk, enum nv_clk_src src) |
| 86 | { |
| 87 | struct nvaa_clock_priv *priv = (void *)clk; |
| 88 | u32 mast = nv_rd32(clk, 0x00c054); |
| 89 | u32 P = 0; |
| 90 | |
| 91 | switch (src) { |
| 92 | case nv_clk_src_crystal: |
| 93 | return nv_device(priv)->crystal; |
| 94 | case nv_clk_src_href: |
| 95 | return 100000; /* PCIE reference clock */ |
| 96 | case nv_clk_src_hclkm4: |
| 97 | return clk->read(clk, nv_clk_src_href) * 4; |
| 98 | case nv_clk_src_hclkm2d3: |
| 99 | return clk->read(clk, nv_clk_src_href) * 2 / 3; |
| 100 | case nv_clk_src_host: |
| 101 | switch (mast & 0x000c0000) { |
| 102 | case 0x00000000: return clk->read(clk, nv_clk_src_hclkm2d3); |
| 103 | case 0x00040000: break; |
| 104 | case 0x00080000: return clk->read(clk, nv_clk_src_hclkm4); |
| 105 | case 0x000c0000: return clk->read(clk, nv_clk_src_cclk); |
| 106 | } |
| 107 | break; |
| 108 | case nv_clk_src_core: |
| 109 | P = (nv_rd32(clk, 0x004028) & 0x00070000) >> 16; |
| 110 | |
| 111 | switch (mast & 0x00000003) { |
| 112 | case 0x00000000: return clk->read(clk, nv_clk_src_crystal) >> P; |
| 113 | case 0x00000001: return 0; |
| 114 | case 0x00000002: return clk->read(clk, nv_clk_src_hclkm4) >> P; |
| 115 | case 0x00000003: return read_pll(clk, 0x004028) >> P; |
| 116 | } |
| 117 | break; |
| 118 | case nv_clk_src_cclk: |
| 119 | if ((mast & 0x03000000) != 0x03000000) |
| 120 | return clk->read(clk, nv_clk_src_core); |
| 121 | |
| 122 | if ((mast & 0x00000200) == 0x00000000) |
| 123 | return clk->read(clk, nv_clk_src_core); |
| 124 | |
| 125 | switch (mast & 0x00000c00) { |
| 126 | case 0x00000000: return clk->read(clk, nv_clk_src_href); |
| 127 | case 0x00000400: return clk->read(clk, nv_clk_src_hclkm4); |
| 128 | case 0x00000800: return clk->read(clk, nv_clk_src_hclkm2d3); |
| 129 | default: return 0; |
| 130 | } |
| 131 | case nv_clk_src_shader: |
| 132 | P = (nv_rd32(clk, 0x004020) & 0x00070000) >> 16; |
| 133 | switch (mast & 0x00000030) { |
| 134 | case 0x00000000: |
| 135 | if (mast & 0x00000040) |
| 136 | return clk->read(clk, nv_clk_src_href) >> P; |
| 137 | return clk->read(clk, nv_clk_src_crystal) >> P; |
| 138 | case 0x00000010: break; |
| 139 | case 0x00000020: return read_pll(clk, 0x004028) >> P; |
| 140 | case 0x00000030: return read_pll(clk, 0x004020) >> P; |
| 141 | } |
| 142 | break; |
| 143 | case nv_clk_src_mem: |
| 144 | return 0; |
| 145 | break; |
| 146 | case nv_clk_src_vdec: |
| 147 | P = (read_div(clk) & 0x00000700) >> 8; |
| 148 | |
| 149 | switch (mast & 0x00400000) { |
| 150 | case 0x00400000: |
| 151 | return clk->read(clk, nv_clk_src_core) >> P; |
| 152 | break; |
| 153 | default: |
| 154 | return 500000 >> P; |
| 155 | break; |
| 156 | } |
| 157 | break; |
| 158 | default: |
| 159 | break; |
| 160 | } |
| 161 | |
| 162 | nv_debug(priv, "unknown clock source %d 0x%08x\n" , src, mast); |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static u32 |
| 167 | calc_pll(struct nvaa_clock_priv *priv, u32 reg, |
| 168 | u32 clock, int *N, int *M, int *P) |
| 169 | { |
| 170 | struct nouveau_bios *bios = nouveau_bios(priv); |
| 171 | struct nvbios_pll pll; |
| 172 | struct nouveau_clock *clk = &priv->base; |
| 173 | int ret; |
| 174 | |
| 175 | ret = nvbios_pll_parse(bios, reg, &pll); |
| 176 | if (ret) |
| 177 | return 0; |
| 178 | |
| 179 | pll.vco2.max_freq = 0; |
| 180 | pll.refclk = clk->read(clk, nv_clk_src_href); |
| 181 | if (!pll.refclk) |
| 182 | return 0; |
| 183 | |
| 184 | return nv04_pll_calc(nv_subdev(priv), &pll, clock, N, M, NULL, NULL, P); |
| 185 | } |
| 186 | |
| 187 | static inline u32 |
| 188 | calc_P(u32 src, u32 target, int *div) |
| 189 | { |
| 190 | u32 clk0 = src, clk1 = src; |
| 191 | for (*div = 0; *div <= 7; (*div)++) { |
| 192 | if (clk0 <= target) { |
| 193 | clk1 = clk0 << (*div ? 1 : 0); |
| 194 | break; |
| 195 | } |
| 196 | clk0 >>= 1; |
| 197 | } |
| 198 | |
| 199 | if (target - clk0 <= clk1 - target) |
| 200 | return clk0; |
| 201 | (*div)--; |
| 202 | return clk1; |
| 203 | } |
| 204 | |
| 205 | static int |
| 206 | nvaa_clock_calc(struct nouveau_clock *clk, struct nouveau_cstate *cstate) |
| 207 | { |
| 208 | struct nvaa_clock_priv *priv = (void *)clk; |
| 209 | const int shader = cstate->domain[nv_clk_src_shader]; |
| 210 | const int core = cstate->domain[nv_clk_src_core]; |
| 211 | const int vdec = cstate->domain[nv_clk_src_vdec]; |
| 212 | u32 out = 0, clock = 0; |
| 213 | int N, M, P1, P2 = 0; |
| 214 | int divs = 0; |
| 215 | |
| 216 | /* cclk: find suitable source, disable PLL if we can */ |
| 217 | if (core < clk->read(clk, nv_clk_src_hclkm4)) |
| 218 | out = calc_P(clk->read(clk, nv_clk_src_hclkm4), core, &divs); |
| 219 | |
| 220 | /* Calculate clock * 2, so shader clock can use it too */ |
| 221 | clock = calc_pll(priv, 0x4028, (core << 1), &N, &M, &P1); |
| 222 | |
| 223 | if (abs(core - out) <= |
| 224 | abs(core - (clock >> 1))) { |
| 225 | priv->csrc = nv_clk_src_hclkm4; |
| 226 | priv->cctrl = divs << 16; |
| 227 | } else { |
| 228 | /* NVCTRL is actually used _after_ NVPOST, and after what we |
| 229 | * call NVPLL. To make matters worse, NVPOST is an integer |
| 230 | * divider instead of a right-shift number. */ |
| 231 | if(P1 > 2) { |
| 232 | P2 = P1 - 2; |
| 233 | P1 = 2; |
| 234 | } |
| 235 | |
| 236 | priv->csrc = nv_clk_src_core; |
| 237 | priv->ccoef = (N << 8) | M; |
| 238 | |
| 239 | priv->cctrl = (P2 + 1) << 16; |
| 240 | priv->cpost = (1 << P1) << 16; |
| 241 | } |
| 242 | |
| 243 | /* sclk: nvpll + divisor, href or spll */ |
| 244 | out = 0; |
| 245 | if (shader == clk->read(clk, nv_clk_src_href)) { |
| 246 | priv->ssrc = nv_clk_src_href; |
| 247 | } else { |
| 248 | clock = calc_pll(priv, 0x4020, shader, &N, &M, &P1); |
| 249 | if (priv->csrc == nv_clk_src_core) { |
| 250 | out = calc_P((core << 1), shader, &divs); |
| 251 | } |
| 252 | |
| 253 | if (abs(shader - out) <= |
| 254 | abs(shader - clock) && |
| 255 | (divs + P2) <= 7) { |
| 256 | priv->ssrc = nv_clk_src_core; |
| 257 | priv->sctrl = (divs + P2) << 16; |
| 258 | } else { |
| 259 | priv->ssrc = nv_clk_src_shader; |
| 260 | priv->scoef = (N << 8) | M; |
| 261 | priv->sctrl = P1 << 16; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | /* vclk */ |
| 266 | out = calc_P(core, vdec, &divs); |
| 267 | clock = calc_P(500000, vdec, &P1); |
| 268 | if(abs(vdec - out) <= |
| 269 | abs(vdec - clock)) { |
| 270 | priv->vsrc = nv_clk_src_cclk; |
| 271 | priv->vdiv = divs << 16; |
| 272 | } else { |
| 273 | priv->vsrc = nv_clk_src_vdec; |
| 274 | priv->vdiv = P1 << 16; |
| 275 | } |
| 276 | |
| 277 | /* Print strategy! */ |
| 278 | nv_debug(priv, "nvpll: %08x %08x %08x\n" , |
| 279 | priv->ccoef, priv->cpost, priv->cctrl); |
| 280 | nv_debug(priv, " spll: %08x %08x %08x\n" , |
| 281 | priv->scoef, priv->spost, priv->sctrl); |
| 282 | nv_debug(priv, " vdiv: %08x\n" , priv->vdiv); |
| 283 | if (priv->csrc == nv_clk_src_hclkm4) |
| 284 | nv_debug(priv, "core: hrefm4\n" ); |
| 285 | else |
| 286 | nv_debug(priv, "core: nvpll\n" ); |
| 287 | |
| 288 | if (priv->ssrc == nv_clk_src_hclkm4) |
| 289 | nv_debug(priv, "shader: hrefm4\n" ); |
| 290 | else if (priv->ssrc == nv_clk_src_core) |
| 291 | nv_debug(priv, "shader: nvpll\n" ); |
| 292 | else |
| 293 | nv_debug(priv, "shader: spll\n" ); |
| 294 | |
| 295 | if (priv->vsrc == nv_clk_src_hclkm4) |
| 296 | nv_debug(priv, "vdec: 500MHz\n" ); |
| 297 | else |
| 298 | nv_debug(priv, "vdec: core\n" ); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | static int |
| 304 | nvaa_clock_prog(struct nouveau_clock *clk) |
| 305 | { |
| 306 | struct nvaa_clock_priv *priv = (void *)clk; |
| 307 | struct nouveau_fifo *pfifo = nouveau_fifo(clk); |
| 308 | unsigned long flags; |
| 309 | u32 pllmask = 0, mast, ptherm_gate; |
| 310 | int ret = -EBUSY; |
| 311 | |
| 312 | /* halt and idle execution engines */ |
| 313 | ptherm_gate = nv_mask(clk, 0x020060, 0x00070000, 0x00000000); |
| 314 | nv_mask(clk, 0x002504, 0x00000001, 0x00000001); |
| 315 | /* Wait until the interrupt handler is finished */ |
| 316 | if (!nv_wait(clk, 0x000100, 0xffffffff, 0x00000000)) |
| 317 | goto resume; |
| 318 | |
| 319 | if (pfifo) |
| 320 | pfifo->pause(pfifo, &flags); |
| 321 | |
| 322 | if (!nv_wait(clk, 0x002504, 0x00000010, 0x00000010)) |
| 323 | goto resume; |
| 324 | if (!nv_wait(clk, 0x00251c, 0x0000003f, 0x0000003f)) |
| 325 | goto resume; |
| 326 | |
| 327 | /* First switch to safe clocks: href */ |
| 328 | mast = nv_mask(clk, 0xc054, 0x03400e70, 0x03400640); |
| 329 | mast &= ~0x00400e73; |
| 330 | mast |= 0x03000000; |
| 331 | |
| 332 | switch (priv->csrc) { |
| 333 | case nv_clk_src_hclkm4: |
| 334 | nv_mask(clk, 0x4028, 0x00070000, priv->cctrl); |
| 335 | mast |= 0x00000002; |
| 336 | break; |
| 337 | case nv_clk_src_core: |
| 338 | nv_wr32(clk, 0x402c, priv->ccoef); |
| 339 | nv_wr32(clk, 0x4028, 0x80000000 | priv->cctrl); |
| 340 | nv_wr32(clk, 0x4040, priv->cpost); |
| 341 | pllmask |= (0x3 << 8); |
| 342 | mast |= 0x00000003; |
| 343 | break; |
| 344 | default: |
| 345 | nv_warn(priv,"Reclocking failed: unknown core clock\n" ); |
| 346 | goto resume; |
| 347 | } |
| 348 | |
| 349 | switch (priv->ssrc) { |
| 350 | case nv_clk_src_href: |
| 351 | nv_mask(clk, 0x4020, 0x00070000, 0x00000000); |
| 352 | /* mast |= 0x00000000; */ |
| 353 | break; |
| 354 | case nv_clk_src_core: |
| 355 | nv_mask(clk, 0x4020, 0x00070000, priv->sctrl); |
| 356 | mast |= 0x00000020; |
| 357 | break; |
| 358 | case nv_clk_src_shader: |
| 359 | nv_wr32(clk, 0x4024, priv->scoef); |
| 360 | nv_wr32(clk, 0x4020, 0x80000000 | priv->sctrl); |
| 361 | nv_wr32(clk, 0x4070, priv->spost); |
| 362 | pllmask |= (0x3 << 12); |
| 363 | mast |= 0x00000030; |
| 364 | break; |
| 365 | default: |
| 366 | nv_warn(priv,"Reclocking failed: unknown sclk clock\n" ); |
| 367 | goto resume; |
| 368 | } |
| 369 | |
| 370 | if (!nv_wait(clk, 0x004080, pllmask, pllmask)) { |
| 371 | nv_warn(priv,"Reclocking failed: unstable PLLs\n" ); |
| 372 | goto resume; |
| 373 | } |
| 374 | |
| 375 | switch (priv->vsrc) { |
| 376 | case nv_clk_src_cclk: |
| 377 | mast |= 0x00400000; |
| 378 | default: |
| 379 | nv_wr32(clk, 0x4600, priv->vdiv); |
| 380 | } |
| 381 | |
| 382 | nv_wr32(clk, 0xc054, mast); |
| 383 | ret = 0; |
| 384 | |
| 385 | resume: |
| 386 | if (pfifo) |
| 387 | pfifo->start(pfifo, &flags); |
| 388 | |
| 389 | nv_mask(clk, 0x002504, 0x00000001, 0x00000000); |
| 390 | nv_wr32(clk, 0x020060, ptherm_gate); |
| 391 | |
| 392 | /* Disable some PLLs and dividers when unused */ |
| 393 | if (priv->csrc != nv_clk_src_core) { |
| 394 | nv_wr32(clk, 0x4040, 0x00000000); |
| 395 | nv_mask(clk, 0x4028, 0x80000000, 0x00000000); |
| 396 | } |
| 397 | |
| 398 | if (priv->ssrc != nv_clk_src_shader) { |
| 399 | nv_wr32(clk, 0x4070, 0x00000000); |
| 400 | nv_mask(clk, 0x4020, 0x80000000, 0x00000000); |
| 401 | } |
| 402 | |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | static void |
| 407 | nvaa_clock_tidy(struct nouveau_clock *clk) |
| 408 | { |
| 409 | } |
| 410 | |
| 411 | static struct nouveau_clocks |
| 412 | nvaa_domains[] = { |
| 413 | { nv_clk_src_crystal, 0xff }, |
| 414 | { nv_clk_src_href , 0xff }, |
| 415 | { nv_clk_src_core , 0xff, 0, "core" , 1000 }, |
| 416 | { nv_clk_src_shader , 0xff, 0, "shader" , 1000 }, |
| 417 | { nv_clk_src_vdec , 0xff, 0, "vdec" , 1000 }, |
| 418 | { nv_clk_src_max } |
| 419 | }; |
| 420 | |
| 421 | static int |
| 422 | nvaa_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine, |
| 423 | struct nouveau_oclass *oclass, void *data, u32 size, |
| 424 | struct nouveau_object **pobject) |
| 425 | { |
| 426 | struct nvaa_clock_priv *priv; |
| 427 | int ret; |
| 428 | |
| 429 | ret = nouveau_clock_create(parent, engine, oclass, nvaa_domains, &priv); |
| 430 | *pobject = nv_object(priv); |
| 431 | if (ret) |
| 432 | return ret; |
| 433 | |
| 434 | priv->base.read = nvaa_clock_read; |
| 435 | priv->base.calc = nvaa_clock_calc; |
| 436 | priv->base.prog = nvaa_clock_prog; |
| 437 | priv->base.tidy = nvaa_clock_tidy; |
| 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | struct nouveau_oclass * |
| 442 | nvaa_clock_oclass = &(struct nouveau_oclass) { |
| 443 | .handle = NV_SUBDEV(CLOCK, 0xaa), |
| 444 | .ofuncs = &(struct nouveau_ofuncs) { |
| 445 | .ctor = nvaa_clock_ctor, |
| 446 | .dtor = _nouveau_clock_dtor, |
| 447 | .init = _nouveau_clock_init, |
| 448 | .fini = _nouveau_clock_fini, |
| 449 | }, |
| 450 | }; |
| 451 | |