powernow.c revision 305615
1/*- 2 * Copyright (c) 2004-2005 Bruno Ducrot 3 * Copyright (c) 2004 FUKUDA Nobuhiko <nfukuda@spa.is.uec.ac.jp> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26/* 27 * Many thanks to Nate Lawson for his helpful comments on this driver and 28 * to Jung-uk Kim for testing. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/10/sys/x86/cpufreq/powernow.c 305615 2016-09-08 15:06:28Z pfg $"); 33 34#include <sys/param.h> 35#include <sys/bus.h> 36#include <sys/cpu.h> 37#include <sys/kernel.h> 38#include <sys/malloc.h> 39#include <sys/module.h> 40#include <sys/pcpu.h> 41#include <sys/systm.h> 42 43#include <machine/pc/bios.h> 44#include <machine/md_var.h> 45#include <machine/specialreg.h> 46#include <machine/cputypes.h> 47#include <machine/vmparam.h> 48#include <sys/rman.h> 49 50#include <vm/vm.h> 51#include <vm/pmap.h> 52 53#include "cpufreq_if.h" 54 55#define PN7_TYPE 0 56#define PN8_TYPE 1 57 58/* Flags for some hardware bugs. */ 59#define A0_ERRATA 0x1 /* Bugs for the rev. A0 of Athlon (K7): 60 * Interrupts must be disabled and no half 61 * multipliers are allowed */ 62#define PENDING_STUCK 0x2 /* With some buggy chipset and some newer AMD64 63 * processor (Rev. G?): 64 * the pending bit from the msr FIDVID_STATUS 65 * is set forever. No workaround :( */ 66 67/* Legacy configuration via BIOS table PSB. */ 68#define PSB_START 0 69#define PSB_STEP 0x10 70#define PSB_SIG "AMDK7PNOW!" 71#define PSB_LEN 10 72#define PSB_OFF 0 73 74struct psb_header { 75 char signature[10]; 76 uint8_t version; 77 uint8_t flags; 78 uint16_t settlingtime; 79 uint8_t res1; 80 uint8_t numpst; 81} __packed; 82 83struct pst_header { 84 uint32_t cpuid; 85 uint8_t fsb; 86 uint8_t maxfid; 87 uint8_t startvid; 88 uint8_t numpstates; 89} __packed; 90 91/* 92 * MSRs and bits used by Powernow technology 93 */ 94#define MSR_AMDK7_FIDVID_CTL 0xc0010041 95#define MSR_AMDK7_FIDVID_STATUS 0xc0010042 96 97/* Bitfields used by K7 */ 98 99#define PN7_CTR_FID(x) ((x) & 0x1f) 100#define PN7_CTR_VID(x) (((x) & 0x1f) << 8) 101#define PN7_CTR_FIDC 0x00010000 102#define PN7_CTR_VIDC 0x00020000 103#define PN7_CTR_FIDCHRATIO 0x00100000 104#define PN7_CTR_SGTC(x) (((uint64_t)(x) & 0x000fffff) << 32) 105 106#define PN7_STA_CFID(x) ((x) & 0x1f) 107#define PN7_STA_SFID(x) (((x) >> 8) & 0x1f) 108#define PN7_STA_MFID(x) (((x) >> 16) & 0x1f) 109#define PN7_STA_CVID(x) (((x) >> 32) & 0x1f) 110#define PN7_STA_SVID(x) (((x) >> 40) & 0x1f) 111#define PN7_STA_MVID(x) (((x) >> 48) & 0x1f) 112 113/* ACPI ctr_val status register to powernow k7 configuration */ 114#define ACPI_PN7_CTRL_TO_FID(x) ((x) & 0x1f) 115#define ACPI_PN7_CTRL_TO_VID(x) (((x) >> 5) & 0x1f) 116#define ACPI_PN7_CTRL_TO_SGTC(x) (((x) >> 10) & 0xffff) 117 118/* Bitfields used by K8 */ 119 120#define PN8_CTR_FID(x) ((x) & 0x3f) 121#define PN8_CTR_VID(x) (((x) & 0x1f) << 8) 122#define PN8_CTR_PENDING(x) (((x) & 1) << 32) 123 124#define PN8_STA_CFID(x) ((x) & 0x3f) 125#define PN8_STA_SFID(x) (((x) >> 8) & 0x3f) 126#define PN8_STA_MFID(x) (((x) >> 16) & 0x3f) 127#define PN8_STA_PENDING(x) (((x) >> 31) & 0x01) 128#define PN8_STA_CVID(x) (((x) >> 32) & 0x1f) 129#define PN8_STA_SVID(x) (((x) >> 40) & 0x1f) 130#define PN8_STA_MVID(x) (((x) >> 48) & 0x1f) 131 132/* Reserved1 to powernow k8 configuration */ 133#define PN8_PSB_TO_RVO(x) ((x) & 0x03) 134#define PN8_PSB_TO_IRT(x) (((x) >> 2) & 0x03) 135#define PN8_PSB_TO_MVS(x) (((x) >> 4) & 0x03) 136#define PN8_PSB_TO_BATT(x) (((x) >> 6) & 0x03) 137 138/* ACPI ctr_val status register to powernow k8 configuration */ 139#define ACPI_PN8_CTRL_TO_FID(x) ((x) & 0x3f) 140#define ACPI_PN8_CTRL_TO_VID(x) (((x) >> 6) & 0x1f) 141#define ACPI_PN8_CTRL_TO_VST(x) (((x) >> 11) & 0x1f) 142#define ACPI_PN8_CTRL_TO_MVS(x) (((x) >> 18) & 0x03) 143#define ACPI_PN8_CTRL_TO_PLL(x) (((x) >> 20) & 0x7f) 144#define ACPI_PN8_CTRL_TO_RVO(x) (((x) >> 28) & 0x03) 145#define ACPI_PN8_CTRL_TO_IRT(x) (((x) >> 30) & 0x03) 146 147 148#define WRITE_FIDVID(fid, vid, ctrl) \ 149 wrmsr(MSR_AMDK7_FIDVID_CTL, \ 150 (((ctrl) << 32) | (1ULL << 16) | ((vid) << 8) | (fid))) 151 152#define COUNT_OFF_IRT(irt) DELAY(10 * (1 << (irt))) 153#define COUNT_OFF_VST(vst) DELAY(20 * (vst)) 154 155#define FID_TO_VCO_FID(fid) \ 156 (((fid) < 8) ? (8 + ((fid) << 1)) : (fid)) 157 158/* 159 * Divide each value by 10 to get the processor multiplier. 160 * Some of those tables are the same as the Linux powernow-k7 161 * implementation by Dave Jones. 162 */ 163static int pn7_fid_to_mult[32] = { 164 110, 115, 120, 125, 50, 55, 60, 65, 165 70, 75, 80, 85, 90, 95, 100, 105, 166 30, 190, 40, 200, 130, 135, 140, 210, 167 150, 225, 160, 165, 170, 180, 0, 0, 168}; 169 170 171static int pn8_fid_to_mult[64] = { 172 40, 45, 50, 55, 60, 65, 70, 75, 173 80, 85, 90, 95, 100, 105, 110, 115, 174 120, 125, 130, 135, 140, 145, 150, 155, 175 160, 165, 170, 175, 180, 185, 190, 195, 176 200, 205, 210, 215, 220, 225, 230, 235, 177 240, 245, 250, 255, 260, 265, 270, 275, 178 280, 285, 290, 295, 300, 305, 310, 315, 179 320, 325, 330, 335, 340, 345, 350, 355, 180}; 181 182/* 183 * Units are in mV. 184 */ 185/* Mobile VRM (K7) */ 186static int pn7_mobile_vid_to_volts[] = { 187 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, 188 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, 189 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 190 1075, 1050, 1025, 1000, 975, 950, 925, 0, 191}; 192/* Desktop VRM (K7) */ 193static int pn7_desktop_vid_to_volts[] = { 194 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, 195 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, 196 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 197 1075, 1050, 1025, 1000, 975, 950, 925, 0, 198}; 199/* Desktop and Mobile VRM (K8) */ 200static int pn8_vid_to_volts[] = { 201 1550, 1525, 1500, 1475, 1450, 1425, 1400, 1375, 202 1350, 1325, 1300, 1275, 1250, 1225, 1200, 1175, 203 1150, 1125, 1100, 1075, 1050, 1025, 1000, 975, 204 950, 925, 900, 875, 850, 825, 800, 0, 205}; 206 207#define POWERNOW_MAX_STATES 16 208 209struct powernow_state { 210 int freq; 211 int power; 212 int fid; 213 int vid; 214}; 215 216struct pn_softc { 217 device_t dev; 218 int pn_type; 219 struct powernow_state powernow_states[POWERNOW_MAX_STATES]; 220 u_int fsb; 221 u_int sgtc; 222 u_int vst; 223 u_int mvs; 224 u_int pll; 225 u_int rvo; 226 u_int irt; 227 int low; 228 int powernow_max_states; 229 u_int powernow_state; 230 u_int errata; 231 int *vid_to_volts; 232}; 233 234/* 235 * Offsets in struct cf_setting array for private values given by 236 * acpi_perf driver. 237 */ 238#define PX_SPEC_CONTROL 0 239#define PX_SPEC_STATUS 1 240 241static void pn_identify(driver_t *driver, device_t parent); 242static int pn_probe(device_t dev); 243static int pn_attach(device_t dev); 244static int pn_detach(device_t dev); 245static int pn_set(device_t dev, const struct cf_setting *cf); 246static int pn_get(device_t dev, struct cf_setting *cf); 247static int pn_settings(device_t dev, struct cf_setting *sets, 248 int *count); 249static int pn_type(device_t dev, int *type); 250 251static device_method_t pn_methods[] = { 252 /* Device interface */ 253 DEVMETHOD(device_identify, pn_identify), 254 DEVMETHOD(device_probe, pn_probe), 255 DEVMETHOD(device_attach, pn_attach), 256 DEVMETHOD(device_detach, pn_detach), 257 258 /* cpufreq interface */ 259 DEVMETHOD(cpufreq_drv_set, pn_set), 260 DEVMETHOD(cpufreq_drv_get, pn_get), 261 DEVMETHOD(cpufreq_drv_settings, pn_settings), 262 DEVMETHOD(cpufreq_drv_type, pn_type), 263 264 {0, 0} 265}; 266 267static devclass_t pn_devclass; 268static driver_t pn_driver = { 269 "powernow", 270 pn_methods, 271 sizeof(struct pn_softc), 272}; 273 274DRIVER_MODULE(powernow, cpu, pn_driver, pn_devclass, 0, 0); 275 276static int 277pn7_setfidvid(struct pn_softc *sc, int fid, int vid) 278{ 279 int cfid, cvid; 280 uint64_t status, ctl; 281 282 status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 283 cfid = PN7_STA_CFID(status); 284 cvid = PN7_STA_CVID(status); 285 286 /* We're already at the requested level. */ 287 if (fid == cfid && vid == cvid) 288 return (0); 289 290 ctl = rdmsr(MSR_AMDK7_FIDVID_CTL) & PN7_CTR_FIDCHRATIO; 291 292 ctl |= PN7_CTR_FID(fid); 293 ctl |= PN7_CTR_VID(vid); 294 ctl |= PN7_CTR_SGTC(sc->sgtc); 295 296 if (sc->errata & A0_ERRATA) 297 disable_intr(); 298 299 if (pn7_fid_to_mult[fid] < pn7_fid_to_mult[cfid]) { 300 wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_FIDC); 301 if (vid != cvid) 302 wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_VIDC); 303 } else { 304 wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_VIDC); 305 if (fid != cfid) 306 wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_FIDC); 307 } 308 309 if (sc->errata & A0_ERRATA) 310 enable_intr(); 311 312 return (0); 313} 314 315static int 316pn8_read_pending_wait(uint64_t *status) 317{ 318 int i = 10000; 319 320 do 321 *status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 322 while (PN8_STA_PENDING(*status) && --i); 323 324 return (i == 0 ? ENXIO : 0); 325} 326 327static int 328pn8_write_fidvid(u_int fid, u_int vid, uint64_t ctrl, uint64_t *status) 329{ 330 int i = 100; 331 332 do 333 WRITE_FIDVID(fid, vid, ctrl); 334 while (pn8_read_pending_wait(status) && --i); 335 336 return (i == 0 ? ENXIO : 0); 337} 338 339static int 340pn8_setfidvid(struct pn_softc *sc, int fid, int vid) 341{ 342 uint64_t status; 343 int cfid, cvid; 344 int rvo; 345 int rv; 346 u_int val; 347 348 rv = pn8_read_pending_wait(&status); 349 if (rv) 350 return (rv); 351 352 cfid = PN8_STA_CFID(status); 353 cvid = PN8_STA_CVID(status); 354 355 if (fid == cfid && vid == cvid) 356 return (0); 357 358 /* 359 * Phase 1: Raise core voltage to requested VID if frequency is 360 * going up. 361 */ 362 while (cvid > vid) { 363 val = cvid - (1 << sc->mvs); 364 rv = pn8_write_fidvid(cfid, (val > 0) ? val : 0, 1ULL, &status); 365 if (rv) { 366 sc->errata |= PENDING_STUCK; 367 return (rv); 368 } 369 cvid = PN8_STA_CVID(status); 370 COUNT_OFF_VST(sc->vst); 371 } 372 373 /* ... then raise to voltage + RVO (if required) */ 374 for (rvo = sc->rvo; rvo > 0 && cvid > 0; --rvo) { 375 /* XXX It's not clear from spec if we have to do that 376 * in 0.25 step or in MVS. Therefore do it as it's done 377 * under Linux */ 378 rv = pn8_write_fidvid(cfid, cvid - 1, 1ULL, &status); 379 if (rv) { 380 sc->errata |= PENDING_STUCK; 381 return (rv); 382 } 383 cvid = PN8_STA_CVID(status); 384 COUNT_OFF_VST(sc->vst); 385 } 386 387 /* Phase 2: change to requested core frequency */ 388 if (cfid != fid) { 389 u_int vco_fid, vco_cfid, fid_delta; 390 391 vco_fid = FID_TO_VCO_FID(fid); 392 vco_cfid = FID_TO_VCO_FID(cfid); 393 394 while (abs(vco_fid - vco_cfid) > 2) { 395 fid_delta = (vco_cfid & 1) ? 1 : 2; 396 if (fid > cfid) { 397 if (cfid > 7) 398 val = cfid + fid_delta; 399 else 400 val = FID_TO_VCO_FID(cfid) + fid_delta; 401 } else 402 val = cfid - fid_delta; 403 rv = pn8_write_fidvid(val, cvid, 404 sc->pll * (uint64_t) sc->fsb, 405 &status); 406 if (rv) { 407 sc->errata |= PENDING_STUCK; 408 return (rv); 409 } 410 cfid = PN8_STA_CFID(status); 411 COUNT_OFF_IRT(sc->irt); 412 413 vco_cfid = FID_TO_VCO_FID(cfid); 414 } 415 416 rv = pn8_write_fidvid(fid, cvid, 417 sc->pll * (uint64_t) sc->fsb, 418 &status); 419 if (rv) { 420 sc->errata |= PENDING_STUCK; 421 return (rv); 422 } 423 cfid = PN8_STA_CFID(status); 424 COUNT_OFF_IRT(sc->irt); 425 } 426 427 /* Phase 3: change to requested voltage */ 428 if (cvid != vid) { 429 rv = pn8_write_fidvid(cfid, vid, 1ULL, &status); 430 cvid = PN8_STA_CVID(status); 431 COUNT_OFF_VST(sc->vst); 432 } 433 434 /* Check if transition failed. */ 435 if (cfid != fid || cvid != vid) 436 rv = ENXIO; 437 438 return (rv); 439} 440 441static int 442pn_set(device_t dev, const struct cf_setting *cf) 443{ 444 struct pn_softc *sc; 445 int fid, vid; 446 int i; 447 int rv; 448 449 if (cf == NULL) 450 return (EINVAL); 451 sc = device_get_softc(dev); 452 453 if (sc->errata & PENDING_STUCK) 454 return (ENXIO); 455 456 for (i = 0; i < sc->powernow_max_states; ++i) 457 if (CPUFREQ_CMP(sc->powernow_states[i].freq / 1000, cf->freq)) 458 break; 459 460 fid = sc->powernow_states[i].fid; 461 vid = sc->powernow_states[i].vid; 462 463 rv = ENODEV; 464 465 switch (sc->pn_type) { 466 case PN7_TYPE: 467 rv = pn7_setfidvid(sc, fid, vid); 468 break; 469 case PN8_TYPE: 470 rv = pn8_setfidvid(sc, fid, vid); 471 break; 472 } 473 474 return (rv); 475} 476 477static int 478pn_get(device_t dev, struct cf_setting *cf) 479{ 480 struct pn_softc *sc; 481 u_int cfid = 0, cvid = 0; 482 int i; 483 uint64_t status; 484 485 if (cf == NULL) 486 return (EINVAL); 487 sc = device_get_softc(dev); 488 if (sc->errata & PENDING_STUCK) 489 return (ENXIO); 490 491 status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 492 493 switch (sc->pn_type) { 494 case PN7_TYPE: 495 cfid = PN7_STA_CFID(status); 496 cvid = PN7_STA_CVID(status); 497 break; 498 case PN8_TYPE: 499 cfid = PN8_STA_CFID(status); 500 cvid = PN8_STA_CVID(status); 501 break; 502 } 503 for (i = 0; i < sc->powernow_max_states; ++i) 504 if (cfid == sc->powernow_states[i].fid && 505 cvid == sc->powernow_states[i].vid) 506 break; 507 508 if (i < sc->powernow_max_states) { 509 cf->freq = sc->powernow_states[i].freq / 1000; 510 cf->power = sc->powernow_states[i].power; 511 cf->lat = 200; 512 cf->volts = sc->vid_to_volts[cvid]; 513 cf->dev = dev; 514 } else { 515 memset(cf, CPUFREQ_VAL_UNKNOWN, sizeof(*cf)); 516 cf->dev = NULL; 517 } 518 519 return (0); 520} 521 522static int 523pn_settings(device_t dev, struct cf_setting *sets, int *count) 524{ 525 struct pn_softc *sc; 526 int i; 527 528 if (sets == NULL|| count == NULL) 529 return (EINVAL); 530 sc = device_get_softc(dev); 531 if (*count < sc->powernow_max_states) 532 return (E2BIG); 533 for (i = 0; i < sc->powernow_max_states; ++i) { 534 sets[i].freq = sc->powernow_states[i].freq / 1000; 535 sets[i].power = sc->powernow_states[i].power; 536 sets[i].lat = 200; 537 sets[i].volts = sc->vid_to_volts[sc->powernow_states[i].vid]; 538 sets[i].dev = dev; 539 } 540 *count = sc->powernow_max_states; 541 542 return (0); 543} 544 545static int 546pn_type(device_t dev, int *type) 547{ 548 if (type == NULL) 549 return (EINVAL); 550 551 *type = CPUFREQ_TYPE_ABSOLUTE; 552 553 return (0); 554} 555 556/* 557 * Given a set of pair of fid/vid, and number of performance states, 558 * compute powernow_states via an insertion sort. 559 */ 560static int 561decode_pst(struct pn_softc *sc, uint8_t *p, int npstates) 562{ 563 int i, j, n; 564 struct powernow_state state; 565 566 for (i = 0; i < POWERNOW_MAX_STATES; ++i) 567 sc->powernow_states[i].freq = CPUFREQ_VAL_UNKNOWN; 568 569 for (n = 0, i = 0; i < npstates; ++i) { 570 state.fid = *p++; 571 state.vid = *p++; 572 state.power = CPUFREQ_VAL_UNKNOWN; 573 574 switch (sc->pn_type) { 575 case PN7_TYPE: 576 state.freq = 100 * pn7_fid_to_mult[state.fid] * sc->fsb; 577 if ((sc->errata & A0_ERRATA) && 578 (pn7_fid_to_mult[state.fid] % 10) == 5) 579 continue; 580 break; 581 case PN8_TYPE: 582 state.freq = 100 * pn8_fid_to_mult[state.fid] * sc->fsb; 583 break; 584 } 585 586 j = n; 587 while (j > 0 && sc->powernow_states[j - 1].freq < state.freq) { 588 memcpy(&sc->powernow_states[j], 589 &sc->powernow_states[j - 1], 590 sizeof(struct powernow_state)); 591 --j; 592 } 593 memcpy(&sc->powernow_states[j], &state, 594 sizeof(struct powernow_state)); 595 ++n; 596 } 597 598 /* 599 * Fix powernow_max_states, if errata a0 give us less states 600 * than expected. 601 */ 602 sc->powernow_max_states = n; 603 604 if (bootverbose) 605 for (i = 0; i < sc->powernow_max_states; ++i) { 606 int fid = sc->powernow_states[i].fid; 607 int vid = sc->powernow_states[i].vid; 608 609 printf("powernow: %2i %8dkHz FID %02x VID %02x\n", 610 i, 611 sc->powernow_states[i].freq, 612 fid, 613 vid); 614 } 615 616 return (0); 617} 618 619static int 620cpuid_is_k7(u_int cpuid) 621{ 622 623 switch (cpuid) { 624 case 0x760: 625 case 0x761: 626 case 0x762: 627 case 0x770: 628 case 0x771: 629 case 0x780: 630 case 0x781: 631 case 0x7a0: 632 return (TRUE); 633 } 634 return (FALSE); 635} 636 637static int 638pn_decode_pst(device_t dev) 639{ 640 int maxpst; 641 struct pn_softc *sc; 642 u_int cpuid, maxfid, startvid; 643 u_long sig; 644 struct psb_header *psb; 645 uint8_t *p; 646 u_int regs[4]; 647 uint64_t status; 648 649 sc = device_get_softc(dev); 650 651 do_cpuid(0x80000001, regs); 652 cpuid = regs[0]; 653 654 if ((cpuid & 0xfff) == 0x760) 655 sc->errata |= A0_ERRATA; 656 657 status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 658 659 switch (sc->pn_type) { 660 case PN7_TYPE: 661 maxfid = PN7_STA_MFID(status); 662 startvid = PN7_STA_SVID(status); 663 break; 664 case PN8_TYPE: 665 maxfid = PN8_STA_MFID(status); 666 /* 667 * we should actually use a variable named 'maxvid' if K8, 668 * but why introducing a new variable for that? 669 */ 670 startvid = PN8_STA_MVID(status); 671 break; 672 default: 673 return (ENODEV); 674 } 675 676 if (bootverbose) { 677 device_printf(dev, "STATUS: 0x%jx\n", status); 678 device_printf(dev, "STATUS: maxfid: 0x%02x\n", maxfid); 679 device_printf(dev, "STATUS: %s: 0x%02x\n", 680 sc->pn_type == PN7_TYPE ? "startvid" : "maxvid", 681 startvid); 682 } 683 684 sig = bios_sigsearch(PSB_START, PSB_SIG, PSB_LEN, PSB_STEP, PSB_OFF); 685 if (sig) { 686 struct pst_header *pst; 687 688 psb = (struct psb_header*)(uintptr_t)BIOS_PADDRTOVADDR(sig); 689 690 switch (psb->version) { 691 default: 692 return (ENODEV); 693 case 0x14: 694 /* 695 * We can't be picky about numpst since at least 696 * some systems have a value of 1 and some have 2. 697 * We trust that cpuid_is_k7() will be better at 698 * catching that we're on a K8 anyway. 699 */ 700 if (sc->pn_type != PN8_TYPE) 701 return (EINVAL); 702 sc->vst = psb->settlingtime; 703 sc->rvo = PN8_PSB_TO_RVO(psb->res1); 704 sc->irt = PN8_PSB_TO_IRT(psb->res1); 705 sc->mvs = PN8_PSB_TO_MVS(psb->res1); 706 sc->low = PN8_PSB_TO_BATT(psb->res1); 707 if (bootverbose) { 708 device_printf(dev, "PSB: VST: %d\n", 709 psb->settlingtime); 710 device_printf(dev, "PSB: RVO %x IRT %d " 711 "MVS %d BATT %d\n", 712 sc->rvo, 713 sc->irt, 714 sc->mvs, 715 sc->low); 716 } 717 break; 718 case 0x12: 719 if (sc->pn_type != PN7_TYPE) 720 return (EINVAL); 721 sc->sgtc = psb->settlingtime * sc->fsb; 722 if (sc->sgtc < 100 * sc->fsb) 723 sc->sgtc = 100 * sc->fsb; 724 break; 725 } 726 727 p = ((uint8_t *) psb) + sizeof(struct psb_header); 728 pst = (struct pst_header*) p; 729 730 maxpst = 200; 731 732 do { 733 struct pst_header *pst = (struct pst_header*) p; 734 735 if (cpuid == pst->cpuid && 736 maxfid == pst->maxfid && 737 startvid == pst->startvid) { 738 sc->powernow_max_states = pst->numpstates; 739 switch (sc->pn_type) { 740 case PN7_TYPE: 741 if (abs(sc->fsb - pst->fsb) > 5) 742 continue; 743 break; 744 case PN8_TYPE: 745 break; 746 } 747 return (decode_pst(sc, 748 p + sizeof(struct pst_header), 749 sc->powernow_max_states)); 750 } 751 752 p += sizeof(struct pst_header) + (2 * pst->numpstates); 753 } while (cpuid_is_k7(pst->cpuid) && maxpst--); 754 755 device_printf(dev, "no match for extended cpuid %.3x\n", cpuid); 756 } 757 758 return (ENODEV); 759} 760 761static int 762pn_decode_acpi(device_t dev, device_t perf_dev) 763{ 764 int i, j, n; 765 uint64_t status; 766 uint32_t ctrl; 767 u_int cpuid; 768 u_int regs[4]; 769 struct pn_softc *sc; 770 struct powernow_state state; 771 struct cf_setting sets[POWERNOW_MAX_STATES]; 772 int count = POWERNOW_MAX_STATES; 773 int type; 774 int rv; 775 776 if (perf_dev == NULL) 777 return (ENXIO); 778 779 rv = CPUFREQ_DRV_SETTINGS(perf_dev, sets, &count); 780 if (rv) 781 return (ENXIO); 782 rv = CPUFREQ_DRV_TYPE(perf_dev, &type); 783 if (rv || (type & CPUFREQ_FLAG_INFO_ONLY) == 0) 784 return (ENXIO); 785 786 sc = device_get_softc(dev); 787 788 do_cpuid(0x80000001, regs); 789 cpuid = regs[0]; 790 if ((cpuid & 0xfff) == 0x760) 791 sc->errata |= A0_ERRATA; 792 793 ctrl = 0; 794 sc->sgtc = 0; 795 for (n = 0, i = 0; i < count; ++i) { 796 ctrl = sets[i].spec[PX_SPEC_CONTROL]; 797 switch (sc->pn_type) { 798 case PN7_TYPE: 799 state.fid = ACPI_PN7_CTRL_TO_FID(ctrl); 800 state.vid = ACPI_PN7_CTRL_TO_VID(ctrl); 801 if ((sc->errata & A0_ERRATA) && 802 (pn7_fid_to_mult[state.fid] % 10) == 5) 803 continue; 804 break; 805 case PN8_TYPE: 806 state.fid = ACPI_PN8_CTRL_TO_FID(ctrl); 807 state.vid = ACPI_PN8_CTRL_TO_VID(ctrl); 808 break; 809 } 810 state.freq = sets[i].freq * 1000; 811 state.power = sets[i].power; 812 813 j = n; 814 while (j > 0 && sc->powernow_states[j - 1].freq < state.freq) { 815 memcpy(&sc->powernow_states[j], 816 &sc->powernow_states[j - 1], 817 sizeof(struct powernow_state)); 818 --j; 819 } 820 memcpy(&sc->powernow_states[j], &state, 821 sizeof(struct powernow_state)); 822 ++n; 823 } 824 825 sc->powernow_max_states = n; 826 state = sc->powernow_states[0]; 827 status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 828 829 switch (sc->pn_type) { 830 case PN7_TYPE: 831 sc->sgtc = ACPI_PN7_CTRL_TO_SGTC(ctrl); 832 /* 833 * XXX Some bios forget the max frequency! 834 * This maybe indicates we have the wrong tables. Therefore, 835 * don't implement a quirk, but fallback to BIOS legacy 836 * tables instead. 837 */ 838 if (PN7_STA_MFID(status) != state.fid) { 839 device_printf(dev, "ACPI MAX frequency not found\n"); 840 return (EINVAL); 841 } 842 sc->fsb = state.freq / 100 / pn7_fid_to_mult[state.fid]; 843 break; 844 case PN8_TYPE: 845 sc->vst = ACPI_PN8_CTRL_TO_VST(ctrl), 846 sc->mvs = ACPI_PN8_CTRL_TO_MVS(ctrl), 847 sc->pll = ACPI_PN8_CTRL_TO_PLL(ctrl), 848 sc->rvo = ACPI_PN8_CTRL_TO_RVO(ctrl), 849 sc->irt = ACPI_PN8_CTRL_TO_IRT(ctrl); 850 sc->low = 0; /* XXX */ 851 852 /* 853 * powernow k8 supports only one low frequency. 854 */ 855 if (sc->powernow_max_states >= 2 && 856 (sc->powernow_states[sc->powernow_max_states - 2].fid < 8)) 857 return (EINVAL); 858 sc->fsb = state.freq / 100 / pn8_fid_to_mult[state.fid]; 859 break; 860 } 861 862 return (0); 863} 864 865static void 866pn_identify(driver_t *driver, device_t parent) 867{ 868 869 if ((amd_pminfo & AMDPM_FID) == 0 || (amd_pminfo & AMDPM_VID) == 0) 870 return; 871 switch (cpu_id & 0xf00) { 872 case 0x600: 873 case 0xf00: 874 break; 875 default: 876 return; 877 } 878 if (device_find_child(parent, "powernow", -1) != NULL) 879 return; 880 if (BUS_ADD_CHILD(parent, 10, "powernow", -1) == NULL) 881 device_printf(parent, "powernow: add child failed\n"); 882} 883 884static int 885pn_probe(device_t dev) 886{ 887 struct pn_softc *sc; 888 uint64_t status; 889 uint64_t rate; 890 struct pcpu *pc; 891 u_int sfid, mfid, cfid; 892 893 sc = device_get_softc(dev); 894 sc->errata = 0; 895 status = rdmsr(MSR_AMDK7_FIDVID_STATUS); 896 897 pc = cpu_get_pcpu(dev); 898 if (pc == NULL) 899 return (ENODEV); 900 901 cpu_est_clockrate(pc->pc_cpuid, &rate); 902 903 switch (cpu_id & 0xf00) { 904 case 0x600: 905 sfid = PN7_STA_SFID(status); 906 mfid = PN7_STA_MFID(status); 907 cfid = PN7_STA_CFID(status); 908 sc->pn_type = PN7_TYPE; 909 sc->fsb = rate / 100000 / pn7_fid_to_mult[cfid]; 910 911 /* 912 * If start FID is different to max FID, then it is a 913 * mobile processor. If not, it is a low powered desktop 914 * processor. 915 */ 916 if (PN7_STA_SFID(status) != PN7_STA_MFID(status)) { 917 sc->vid_to_volts = pn7_mobile_vid_to_volts; 918 device_set_desc(dev, "PowerNow! K7"); 919 } else { 920 sc->vid_to_volts = pn7_desktop_vid_to_volts; 921 device_set_desc(dev, "Cool`n'Quiet K7"); 922 } 923 break; 924 925 case 0xf00: 926 sfid = PN8_STA_SFID(status); 927 mfid = PN8_STA_MFID(status); 928 cfid = PN8_STA_CFID(status); 929 sc->pn_type = PN8_TYPE; 930 sc->vid_to_volts = pn8_vid_to_volts; 931 sc->fsb = rate / 100000 / pn8_fid_to_mult[cfid]; 932 933 if (PN8_STA_SFID(status) != PN8_STA_MFID(status)) 934 device_set_desc(dev, "PowerNow! K8"); 935 else 936 device_set_desc(dev, "Cool`n'Quiet K8"); 937 break; 938 default: 939 return (ENODEV); 940 } 941 942 return (0); 943} 944 945static int 946pn_attach(device_t dev) 947{ 948 int rv; 949 device_t child; 950 951 child = device_find_child(device_get_parent(dev), "acpi_perf", -1); 952 if (child) { 953 rv = pn_decode_acpi(dev, child); 954 if (rv) 955 rv = pn_decode_pst(dev); 956 } else 957 rv = pn_decode_pst(dev); 958 959 if (rv != 0) 960 return (ENXIO); 961 cpufreq_register(dev); 962 return (0); 963} 964 965static int 966pn_detach(device_t dev) 967{ 968 969 return (cpufreq_unregister(dev)); 970} 971