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sys/dev/acpica/acpi_hpet.c
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1 /*- 2 * Copyright (c) 2005 Poul-Henning Kamp 3 * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_acpi.h" 32 #if defined(__amd64__) || defined(__ia64__) 33 #define DEV_APIC 34 #else 35 #include "opt_apic.h" 36 #endif 37 #include <sys/param.h> 38 #include <sys/conf.h> 39 #include <sys/bus.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/proc.h> 43 #include <sys/rman.h> 44 #include <sys/mman.h> 45 #include <sys/time.h> 46 #include <sys/smp.h> 47 #include <sys/sysctl.h> 48 #include <sys/timeet.h> 49 #include <sys/timetc.h> 50 51 #include <contrib/dev/acpica/include/acpi.h> 52 #include <contrib/dev/acpica/include/accommon.h> 53 54 #include <dev/acpica/acpivar.h> 55 #include <dev/acpica/acpi_hpet.h> 56 57 #ifdef DEV_APIC 58 #include "pcib_if.h" 59 #endif 60 61 #define HPET_VENDID_AMD 0x4353 62 #define HPET_VENDID_AMD2 0x1022 63 #define HPET_VENDID_INTEL 0x8086 64 #define HPET_VENDID_NVIDIA 0x10de 65 #define HPET_VENDID_SW 0x1166 66 67 ACPI_SERIAL_DECL(hpet, "ACPI HPET support"); 68 69 static devclass_t hpet_devclass; 70 71 /* ACPI CA debugging */ 72 #define _COMPONENT ACPI_TIMER 73 ACPI_MODULE_NAME("HPET") 74 75 struct hpet_softc { 76 device_t dev; 77 int mem_rid; 78 int intr_rid; 79 int irq; 80 int useirq; 81 int legacy_route; 82 int per_cpu; 83 uint32_t allowed_irqs; 84 struct resource *mem_res; 85 struct resource *intr_res; 86 void *intr_handle; 87 ACPI_HANDLE handle; 88 uint64_t freq; 89 uint32_t caps; 90 struct timecounter tc; 91 struct hpet_timer { 92 struct eventtimer et; 93 struct hpet_softc *sc; 94 int num; 95 int mode; 96 #define TIMER_STOPPED 0 97 #define TIMER_PERIODIC 1 98 #define TIMER_ONESHOT 2 99 int intr_rid; 100 int irq; 101 int pcpu_cpu; 102 int pcpu_misrouted; 103 int pcpu_master; 104 int pcpu_slaves[MAXCPU]; 105 struct resource *intr_res; 106 void *intr_handle; 107 uint32_t caps; 108 uint32_t vectors; 109 uint32_t div; 110 uint32_t next; 111 char name[8]; 112 } t[32]; 113 int num_timers; 114 struct cdev *pdev; 115 int mmap_allow; 116 int mmap_allow_write; 117 }; 118 119 static d_open_t hpet_open; 120 static d_mmap_t hpet_mmap; 121 122 static struct cdevsw hpet_cdevsw = { 123 .d_version = D_VERSION, 124 .d_name = "hpet", 125 .d_open = hpet_open, 126 .d_mmap = hpet_mmap, 127 }; 128 129 static u_int hpet_get_timecount(struct timecounter *tc); 130 static void hpet_test(struct hpet_softc *sc); 131 132 static char *hpet_ids[] = { "PNP0103", NULL }; 133 134 static u_int 135 hpet_get_timecount(struct timecounter *tc) 136 { 137 struct hpet_softc *sc; 138 139 sc = tc->tc_priv; 140 return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER)); 141 } 142 143 static void 144 hpet_enable(struct hpet_softc *sc) 145 { 146 uint32_t val; 147 148 val = bus_read_4(sc->mem_res, HPET_CONFIG); 149 if (sc->legacy_route) 150 val |= HPET_CNF_LEG_RT; 151 else 152 val &= ~HPET_CNF_LEG_RT; 153 val |= HPET_CNF_ENABLE; 154 bus_write_4(sc->mem_res, HPET_CONFIG, val); 155 } 156 157 static void 158 hpet_disable(struct hpet_softc *sc) 159 { 160 uint32_t val; 161 162 val = bus_read_4(sc->mem_res, HPET_CONFIG); 163 val &= ~HPET_CNF_ENABLE; 164 bus_write_4(sc->mem_res, HPET_CONFIG, val); 165 } 166 167 static int 168 hpet_start(struct eventtimer *et, sbintime_t first, sbintime_t period) 169 { 170 struct hpet_timer *mt = (struct hpet_timer *)et->et_priv; 171 struct hpet_timer *t; 172 struct hpet_softc *sc = mt->sc; 173 uint32_t fdiv, now; 174 175 t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]]; 176 if (period != 0) { 177 t->mode = TIMER_PERIODIC; 178 t->div = (sc->freq * period) >> 32; 179 } else { 180 t->mode = TIMER_ONESHOT; 181 t->div = 0; 182 } 183 if (first != 0) 184 fdiv = (sc->freq * first) >> 32; 185 else 186 fdiv = t->div; 187 if (t->irq < 0) 188 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num); 189 t->caps |= HPET_TCNF_INT_ENB; 190 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 191 restart: 192 t->next = now + fdiv; 193 if (t->mode == TIMER_PERIODIC && (t->caps & HPET_TCAP_PER_INT)) { 194 t->caps |= HPET_TCNF_TYPE; 195 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 196 t->caps | HPET_TCNF_VAL_SET); 197 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 198 t->next); 199 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 200 t->div); 201 } else { 202 t->caps &= ~HPET_TCNF_TYPE; 203 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 204 t->caps); 205 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 206 t->next); 207 } 208 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 209 if ((int32_t)(now - t->next + HPET_MIN_CYCLES) >= 0) { 210 fdiv *= 2; 211 goto restart; 212 } 213 return (0); 214 } 215 216 static int 217 hpet_stop(struct eventtimer *et) 218 { 219 struct hpet_timer *mt = (struct hpet_timer *)et->et_priv; 220 struct hpet_timer *t; 221 struct hpet_softc *sc = mt->sc; 222 223 t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]]; 224 t->mode = TIMER_STOPPED; 225 t->caps &= ~(HPET_TCNF_INT_ENB | HPET_TCNF_TYPE); 226 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps); 227 return (0); 228 } 229 230 static int 231 hpet_intr_single(void *arg) 232 { 233 struct hpet_timer *t = (struct hpet_timer *)arg; 234 struct hpet_timer *mt; 235 struct hpet_softc *sc = t->sc; 236 uint32_t now; 237 238 if (t->mode == TIMER_STOPPED) 239 return (FILTER_STRAY); 240 /* Check that per-CPU timer interrupt reached right CPU. */ 241 if (t->pcpu_cpu >= 0 && t->pcpu_cpu != curcpu) { 242 if ((++t->pcpu_misrouted) % 32 == 0) { 243 printf("HPET interrupt routed to the wrong CPU" 244 " (timer %d CPU %d -> %d)!\n", 245 t->num, t->pcpu_cpu, curcpu); 246 } 247 248 /* 249 * Reload timer, hoping that next time may be more lucky 250 * (system will manage proper interrupt binding). 251 */ 252 if ((t->mode == TIMER_PERIODIC && 253 (t->caps & HPET_TCAP_PER_INT) == 0) || 254 t->mode == TIMER_ONESHOT) { 255 t->next = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER) + 256 sc->freq / 8; 257 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 258 t->next); 259 } 260 return (FILTER_HANDLED); 261 } 262 if (t->mode == TIMER_PERIODIC && 263 (t->caps & HPET_TCAP_PER_INT) == 0) { 264 t->next += t->div; 265 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 266 if ((int32_t)((now + t->div / 2) - t->next) > 0) 267 t->next = now + t->div / 2; 268 bus_write_4(sc->mem_res, 269 HPET_TIMER_COMPARATOR(t->num), t->next); 270 } else if (t->mode == TIMER_ONESHOT) 271 t->mode = TIMER_STOPPED; 272 mt = (t->pcpu_master < 0) ? t : &sc->t[t->pcpu_master]; 273 if (mt->et.et_active) 274 mt->et.et_event_cb(&mt->et, mt->et.et_arg); 275 return (FILTER_HANDLED); 276 } 277 278 static int 279 hpet_intr(void *arg) 280 { 281 struct hpet_softc *sc = (struct hpet_softc *)arg; 282 int i; 283 uint32_t val; 284 285 val = bus_read_4(sc->mem_res, HPET_ISR); 286 if (val) { 287 bus_write_4(sc->mem_res, HPET_ISR, val); 288 val &= sc->useirq; 289 for (i = 0; i < sc->num_timers; i++) { 290 if ((val & (1 << i)) == 0) 291 continue; 292 hpet_intr_single(&sc->t[i]); 293 } 294 return (FILTER_HANDLED); 295 } 296 return (FILTER_STRAY); 297 } 298 299 static ACPI_STATUS 300 hpet_find(ACPI_HANDLE handle, UINT32 level, void *context, 301 void **status) 302 { 303 char **ids; 304 uint32_t id = (uint32_t)(uintptr_t)context; 305 uint32_t uid = 0; 306 307 for (ids = hpet_ids; *ids != NULL; ids++) { 308 if (acpi_MatchHid(handle, *ids)) 309 break; 310 } 311 if (*ids == NULL) 312 return (AE_OK); 313 if (ACPI_FAILURE(acpi_GetInteger(handle, "_UID", &uid)) || 314 id == uid) 315 *status = acpi_get_device(handle); 316 return (AE_OK); 317 } 318 319 /* 320 * Find an existing IRQ resource that matches the requested IRQ range 321 * and return its RID. If one is not found, use a new RID. 322 */ 323 static int 324 hpet_find_irq_rid(device_t dev, u_long start, u_long end) 325 { 326 u_long irq; 327 int error, rid; 328 329 for (rid = 0;; rid++) { 330 error = bus_get_resource(dev, SYS_RES_IRQ, rid, &irq, NULL); 331 if (error != 0 || (start <= irq && irq <= end)) 332 return (rid); 333 } 334 } 335 336 static int 337 hpet_open(struct cdev *cdev, int oflags, int devtype, struct thread *td) 338 { 339 struct hpet_softc *sc; 340 341 sc = cdev->si_drv1; 342 if (!sc->mmap_allow) 343 return (EPERM); 344 else 345 return (0); 346 } 347 348 static int 349 hpet_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, 350 int nprot, vm_memattr_t *memattr) 351 { 352 struct hpet_softc *sc; 353 354 sc = cdev->si_drv1; 355 if (offset > rman_get_size(sc->mem_res)) 356 return (EINVAL); 357 if (!sc->mmap_allow_write && (nprot & PROT_WRITE)) 358 return (EPERM); 359 *paddr = rman_get_start(sc->mem_res) + offset; 360 *memattr = VM_MEMATTR_UNCACHEABLE; 361 362 return (0); 363 } 364 365 /* Discover the HPET via the ACPI table of the same name. */ 366 static void 367 hpet_identify(driver_t *driver, device_t parent) 368 { 369 ACPI_TABLE_HPET *hpet; 370 ACPI_STATUS status; 371 device_t child; 372 int i; 373 374 /* Only one HPET device can be added. */ 375 if (devclass_get_device(hpet_devclass, 0)) 376 return; 377 for (i = 1; ; i++) { 378 /* Search for HPET table. */ 379 status = AcpiGetTable(ACPI_SIG_HPET, i, (ACPI_TABLE_HEADER **)&hpet); 380 if (ACPI_FAILURE(status)) 381 return; 382 /* Search for HPET device with same ID. */ 383 child = NULL; 384 AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 385 100, hpet_find, NULL, (void *)(uintptr_t)hpet->Sequence, 386 (void *)&child); 387 /* If found - let it be probed in normal way. */ 388 if (child) { 389 if (bus_get_resource(child, SYS_RES_MEMORY, 0, 390 NULL, NULL) != 0) 391 bus_set_resource(child, SYS_RES_MEMORY, 0, 392 hpet->Address.Address, HPET_MEM_WIDTH); 393 continue; 394 } 395 /* If not - create it from table info. */ 396 child = BUS_ADD_CHILD(parent, 2, "hpet", 0); 397 if (child == NULL) { 398 printf("%s: can't add child\n", __func__); 399 continue; 400 } 401 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address, 402 HPET_MEM_WIDTH); 403 } 404 } 405 406 static int 407 hpet_probe(device_t dev) 408 { 409 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 410 411 if (acpi_disabled("hpet")) 412 return (ENXIO); 413 if (acpi_get_handle(dev) != NULL && 414 ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL) 415 return (ENXIO); 416 417 device_set_desc(dev, "High Precision Event Timer"); 418 return (0); 419 } 420 421 static int 422 hpet_attach(device_t dev) 423 { 424 struct hpet_softc *sc; 425 struct hpet_timer *t; 426 int i, j, num_msi, num_timers, num_percpu_et, num_percpu_t, cur_cpu; 427 int pcpu_master; 428 static int maxhpetet = 0; 429 uint32_t val, val2, cvectors, dvectors; 430 uint16_t vendor, rev; 431 432 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 433 434 sc = device_get_softc(dev); 435 sc->dev = dev; 436 sc->handle = acpi_get_handle(dev); 437 438 sc->mem_rid = 0; 439 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->mem_rid, 440 RF_ACTIVE); 441 if (sc->mem_res == NULL) 442 return (ENOMEM); 443 444 /* Validate that we can access the whole region. */ 445 if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) { 446 device_printf(dev, "memory region width %ld too small\n", 447 rman_get_size(sc->mem_res)); 448 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 449 return (ENXIO); 450 } 451 452 /* Be sure timer is enabled. */ 453 hpet_enable(sc); 454 455 /* Read basic statistics about the timer. */ 456 val = bus_read_4(sc->mem_res, HPET_PERIOD); 457 if (val == 0) { 458 device_printf(dev, "invalid period\n"); 459 hpet_disable(sc); 460 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 461 return (ENXIO); 462 } 463 464 sc->freq = (1000000000000000LL + val / 2) / val; 465 sc->caps = bus_read_4(sc->mem_res, HPET_CAPABILITIES); 466 vendor = (sc->caps & HPET_CAP_VENDOR_ID) >> 16; 467 rev = sc->caps & HPET_CAP_REV_ID; 468 num_timers = 1 + ((sc->caps & HPET_CAP_NUM_TIM) >> 8); 469 /* 470 * ATI/AMD violates IA-PC HPET (High Precision Event Timers) 471 * Specification and provides an off by one number 472 * of timers/comparators. 473 * Additionally, they use unregistered value in VENDOR_ID field. 474 */ 475 if (vendor == HPET_VENDID_AMD && rev < 0x10 && num_timers > 0) 476 num_timers--; 477 sc->num_timers = num_timers; 478 if (bootverbose) { 479 device_printf(dev, 480 "vendor 0x%x, rev 0x%x, %jdHz%s, %d timers,%s\n", 481 vendor, rev, sc->freq, 482 (sc->caps & HPET_CAP_COUNT_SIZE) ? " 64bit" : "", 483 num_timers, 484 (sc->caps & HPET_CAP_LEG_RT) ? " legacy route" : ""); 485 } 486 for (i = 0; i < num_timers; i++) { 487 t = &sc->t[i]; 488 t->sc = sc; 489 t->num = i; 490 t->mode = TIMER_STOPPED; 491 t->intr_rid = -1; 492 t->irq = -1; 493 t->pcpu_cpu = -1; 494 t->pcpu_misrouted = 0; 495 t->pcpu_master = -1; 496 t->caps = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i)); 497 t->vectors = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i) + 4); 498 if (bootverbose) { 499 device_printf(dev, 500 " t%d: irqs 0x%08x (%d)%s%s%s\n", i, 501 t->vectors, (t->caps & HPET_TCNF_INT_ROUTE) >> 9, 502 (t->caps & HPET_TCAP_FSB_INT_DEL) ? ", MSI" : "", 503 (t->caps & HPET_TCAP_SIZE) ? ", 64bit" : "", 504 (t->caps & HPET_TCAP_PER_INT) ? ", periodic" : ""); 505 } 506 } 507 if (testenv("debug.acpi.hpet_test")) 508 hpet_test(sc); 509 /* 510 * Don't attach if the timer never increments. Since the spec 511 * requires it to be at least 10 MHz, it has to change in 1 us. 512 */ 513 val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 514 DELAY(1); 515 val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 516 if (val == val2) { 517 device_printf(dev, "HPET never increments, disabling\n"); 518 hpet_disable(sc); 519 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 520 return (ENXIO); 521 } 522 /* Announce first HPET as timecounter. */ 523 if (device_get_unit(dev) == 0) { 524 sc->tc.tc_get_timecount = hpet_get_timecount, 525 sc->tc.tc_counter_mask = ~0u, 526 sc->tc.tc_name = "HPET", 527 sc->tc.tc_quality = 950, 528 sc->tc.tc_frequency = sc->freq; 529 sc->tc.tc_priv = sc; 530 tc_init(&sc->tc); 531 } 532 /* If not disabled - setup and announce event timers. */ 533 if (resource_int_value(device_get_name(dev), device_get_unit(dev), 534 "clock", &i) == 0 && i == 0) 535 return (0); 536 537 /* Check whether we can and want legacy routing. */ 538 sc->legacy_route = 0; 539 resource_int_value(device_get_name(dev), device_get_unit(dev), 540 "legacy_route", &sc->legacy_route); 541 if ((sc->caps & HPET_CAP_LEG_RT) == 0) 542 sc->legacy_route = 0; 543 if (sc->legacy_route) { 544 sc->t[0].vectors = 0; 545 sc->t[1].vectors = 0; 546 } 547 548 /* Check what IRQs we want use. */ 549 /* By default allow any PCI IRQs. */ 550 sc->allowed_irqs = 0xffff0000; 551 /* 552 * HPETs in AMD chipsets before SB800 have problems with IRQs >= 16 553 * Lower are also not always working for different reasons. 554 * SB800 fixed it, but seems do not implements level triggering 555 * properly, that makes it very unreliable - it freezes after any 556 * interrupt loss. Avoid legacy IRQs for AMD. 557 */ 558 if (vendor == HPET_VENDID_AMD || vendor == HPET_VENDID_AMD2) 559 sc->allowed_irqs = 0x00000000; 560 /* 561 * NVidia MCP5x chipsets have number of unexplained interrupt 562 * problems. For some reason, using HPET interrupts breaks HDA sound. 563 */ 564 if (vendor == HPET_VENDID_NVIDIA && rev <= 0x01) 565 sc->allowed_irqs = 0x00000000; 566 /* 567 * ServerWorks HT1000 reported to have problems with IRQs >= 16. 568 * Lower IRQs are working, but allowed mask is not set correctly. 569 * Legacy_route mode works fine. 570 */ 571 if (vendor == HPET_VENDID_SW && rev <= 0x01) 572 sc->allowed_irqs = 0x00000000; 573 /* 574 * Neither QEMU nor VirtualBox report supported IRQs correctly. 575 * The only way to use HPET there is to specify IRQs manually 576 * and/or use legacy_route. Legacy_route mode works on both. 577 */ 578 if (vm_guest) 579 sc->allowed_irqs = 0x00000000; 580 /* Let user override. */ 581 resource_int_value(device_get_name(dev), device_get_unit(dev), 582 "allowed_irqs", &sc->allowed_irqs); 583 584 /* Get how much per-CPU timers we should try to provide. */ 585 sc->per_cpu = 1; 586 resource_int_value(device_get_name(dev), device_get_unit(dev), 587 "per_cpu", &sc->per_cpu); 588 589 num_msi = 0; 590 sc->useirq = 0; 591 /* Find IRQ vectors for all timers. */ 592 cvectors = sc->allowed_irqs & 0xffff0000; 593 dvectors = sc->allowed_irqs & 0x0000ffff; 594 if (sc->legacy_route) 595 dvectors &= 0x0000fefe; 596 for (i = 0; i < num_timers; i++) { 597 t = &sc->t[i]; 598 if (sc->legacy_route && i < 2) 599 t->irq = (i == 0) ? 0 : 8; 600 #ifdef DEV_APIC 601 else if (t->caps & HPET_TCAP_FSB_INT_DEL) { 602 if ((j = PCIB_ALLOC_MSIX( 603 device_get_parent(device_get_parent(dev)), dev, 604 &t->irq))) { 605 device_printf(dev, 606 "Can't allocate interrupt for t%d.\n", j); 607 } 608 } 609 #endif 610 else if (dvectors & t->vectors) { 611 t->irq = ffs(dvectors & t->vectors) - 1; 612 dvectors &= ~(1 << t->irq); 613 } 614 if (t->irq >= 0) { 615 t->intr_rid = hpet_find_irq_rid(dev, t->irq, t->irq); 616 t->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ, 617 &t->intr_rid, t->irq, t->irq, 1, RF_ACTIVE); 618 if (t->intr_res == NULL) { 619 t->irq = -1; 620 device_printf(dev, 621 "Can't map interrupt for t%d.\n", i); 622 } else if (bus_setup_intr(dev, t->intr_res, 623 INTR_TYPE_CLK, hpet_intr_single, NULL, t, 624 &t->intr_handle) != 0) { 625 t->irq = -1; 626 device_printf(dev, 627 "Can't setup interrupt for t%d.\n", i); 628 } else { 629 bus_describe_intr(dev, t->intr_res, 630 t->intr_handle, "t%d", i); 631 num_msi++; 632 } 633 } 634 if (t->irq < 0 && (cvectors & t->vectors) != 0) { 635 cvectors &= t->vectors; 636 sc->useirq |= (1 << i); 637 } 638 } 639 if (sc->legacy_route && sc->t[0].irq < 0 && sc->t[1].irq < 0) 640 sc->legacy_route = 0; 641 if (sc->legacy_route) 642 hpet_enable(sc); 643 /* Group timers for per-CPU operation. */ 644 num_percpu_et = min(num_msi / mp_ncpus, sc->per_cpu); 645 num_percpu_t = num_percpu_et * mp_ncpus; 646 pcpu_master = 0; 647 cur_cpu = CPU_FIRST(); 648 for (i = 0; i < num_timers; i++) { 649 t = &sc->t[i]; 650 if (t->irq >= 0 && num_percpu_t > 0) { 651 if (cur_cpu == CPU_FIRST()) 652 pcpu_master = i; 653 t->pcpu_cpu = cur_cpu; 654 t->pcpu_master = pcpu_master; 655 sc->t[pcpu_master]. 656 pcpu_slaves[cur_cpu] = i; 657 bus_bind_intr(dev, t->intr_res, cur_cpu); 658 cur_cpu = CPU_NEXT(cur_cpu); 659 num_percpu_t--; 660 } else if (t->irq >= 0) 661 bus_bind_intr(dev, t->intr_res, CPU_FIRST()); 662 } 663 bus_write_4(sc->mem_res, HPET_ISR, 0xffffffff); 664 sc->irq = -1; 665 /* If at least one timer needs legacy IRQ - set it up. */ 666 if (sc->useirq) { 667 j = i = fls(cvectors) - 1; 668 while (j > 0 && (cvectors & (1 << (j - 1))) != 0) 669 j--; 670 sc->intr_rid = hpet_find_irq_rid(dev, j, i); 671 sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ, 672 &sc->intr_rid, j, i, 1, RF_SHAREABLE | RF_ACTIVE); 673 if (sc->intr_res == NULL) 674 device_printf(dev, "Can't map interrupt.\n"); 675 else if (bus_setup_intr(dev, sc->intr_res, INTR_TYPE_CLK, 676 hpet_intr, NULL, sc, &sc->intr_handle) != 0) { 677 device_printf(dev, "Can't setup interrupt.\n"); 678 } else { 679 sc->irq = rman_get_start(sc->intr_res); 680 /* Bind IRQ to BSP to avoid live migration. */ 681 bus_bind_intr(dev, sc->intr_res, CPU_FIRST()); 682 } 683 } 684 /* Program and announce event timers. */ 685 for (i = 0; i < num_timers; i++) { 686 t = &sc->t[i]; 687 t->caps &= ~(HPET_TCNF_FSB_EN | HPET_TCNF_INT_ROUTE); 688 t->caps &= ~(HPET_TCNF_VAL_SET | HPET_TCNF_INT_ENB); 689 t->caps &= ~(HPET_TCNF_INT_TYPE); 690 t->caps |= HPET_TCNF_32MODE; 691 if (t->irq >= 0 && sc->legacy_route && i < 2) { 692 /* Legacy route doesn't need more configuration. */ 693 } else 694 #ifdef DEV_APIC 695 if ((t->caps & HPET_TCAP_FSB_INT_DEL) && t->irq >= 0) { 696 uint64_t addr; 697 uint32_t data; 698 699 if (PCIB_MAP_MSI( 700 device_get_parent(device_get_parent(dev)), dev, 701 t->irq, &addr, &data) == 0) { 702 bus_write_4(sc->mem_res, 703 HPET_TIMER_FSB_ADDR(i), addr); 704 bus_write_4(sc->mem_res, 705 HPET_TIMER_FSB_VAL(i), data); 706 t->caps |= HPET_TCNF_FSB_EN; 707 } else 708 t->irq = -2; 709 } else 710 #endif 711 if (t->irq >= 0) 712 t->caps |= (t->irq << 9); 713 else if (sc->irq >= 0 && (t->vectors & (1 << sc->irq))) 714 t->caps |= (sc->irq << 9) | HPET_TCNF_INT_TYPE; 715 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(i), t->caps); 716 /* Skip event timers without set up IRQ. */ 717 if (t->irq < 0 && 718 (sc->irq < 0 || (t->vectors & (1 << sc->irq)) == 0)) 719 continue; 720 /* Announce the reset. */ 721 if (maxhpetet == 0) 722 t->et.et_name = "HPET"; 723 else { 724 sprintf(t->name, "HPET%d", maxhpetet); 725 t->et.et_name = t->name; 726 } 727 t->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT; 728 t->et.et_quality = 450; 729 if (t->pcpu_master >= 0) { 730 t->et.et_flags |= ET_FLAGS_PERCPU; 731 t->et.et_quality += 100; 732 } else if (mp_ncpus >= 8) 733 t->et.et_quality -= 100; 734 if ((t->caps & HPET_TCAP_PER_INT) == 0) 735 t->et.et_quality -= 10; 736 t->et.et_frequency = sc->freq; 737 t->et.et_min_period = 738 ((uint64_t)(HPET_MIN_CYCLES * 2) << 32) / sc->freq; 739 t->et.et_max_period = (0xfffffffeLLU << 32) / sc->freq; 740 t->et.et_start = hpet_start; 741 t->et.et_stop = hpet_stop; 742 t->et.et_priv = &sc->t[i]; 743 if (t->pcpu_master < 0 || t->pcpu_master == i) { 744 et_register(&t->et); 745 maxhpetet++; 746 } 747 } 748 749 sc->pdev = make_dev(&hpet_cdevsw, 0, UID_ROOT, GID_WHEEL, 750 0600, "hpet%d", device_get_unit(dev)); 751 if (sc->pdev) { 752 sc->pdev->si_drv1 = sc; 753 sc->mmap_allow = 1; 754 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow", 755 &sc->mmap_allow); 756 sc->mmap_allow_write = 1; 757 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow_write", 758 &sc->mmap_allow_write); 759 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), 760 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 761 OID_AUTO, "mmap_allow", 762 CTLFLAG_RW, &sc->mmap_allow, 0, 763 "Allow userland to memory map HPET"); 764 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), 765 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 766 OID_AUTO, "mmap_allow_write", 767 CTLFLAG_RW, &sc->mmap_allow_write, 0, 768 "Allow userland write to the HPET register space"); 769 } else 770 device_printf(dev, "could not create /dev/hpet%d\n", 771 device_get_unit(dev)); 772 773 return (0); 774 } 775 776 static int 777 hpet_detach(device_t dev) 778 { 779 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 780 781 /* XXX Without a tc_remove() function, we can't detach. */ 782 return (EBUSY); 783 } 784 785 static int 786 hpet_suspend(device_t dev) 787 { 788 // struct hpet_softc *sc; 789 790 /* 791 * Disable the timer during suspend. The timer will not lose 792 * its state in S1 or S2, but we are required to disable 793 * it. 794 */ 795 // sc = device_get_softc(dev); 796 // hpet_disable(sc); 797 798 return (0); 799 } 800 801 static int 802 hpet_resume(device_t dev) 803 { 804 struct hpet_softc *sc; 805 struct hpet_timer *t; 806 int i; 807 808 /* Re-enable the timer after a resume to keep the clock advancing. */ 809 sc = device_get_softc(dev); 810 hpet_enable(sc); 811 /* Restart event timers that were running on suspend. */ 812 for (i = 0; i < sc->num_timers; i++) { 813 t = &sc->t[i]; 814 #ifdef DEV_APIC 815 if (t->irq >= 0 && (sc->legacy_route == 0 || i >= 2)) { 816 uint64_t addr; 817 uint32_t data; 818 819 if (PCIB_MAP_MSI( 820 device_get_parent(device_get_parent(dev)), dev, 821 t->irq, &addr, &data) == 0) { 822 bus_write_4(sc->mem_res, 823 HPET_TIMER_FSB_ADDR(i), addr); 824 bus_write_4(sc->mem_res, 825 HPET_TIMER_FSB_VAL(i), data); 826 } 827 } 828 #endif 829 if (t->mode == TIMER_STOPPED) 830 continue; 831 t->next = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 832 if (t->mode == TIMER_PERIODIC && 833 (t->caps & HPET_TCAP_PER_INT) != 0) { 834 t->caps |= HPET_TCNF_TYPE; 835 t->next += t->div; 836 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 837 t->caps | HPET_TCNF_VAL_SET); 838 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 839 t->next); 840 bus_read_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num)); 841 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 842 t->div); 843 } else { 844 t->next += sc->freq / 1024; 845 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 846 t->next); 847 } 848 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num); 849 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps); 850 } 851 return (0); 852 } 853 854 /* Print some basic latency/rate information to assist in debugging. */ 855 static void 856 hpet_test(struct hpet_softc *sc) 857 { 858 int i; 859 uint32_t u1, u2; 860 struct bintime b0, b1, b2; 861 struct timespec ts; 862 863 binuptime(&b0); 864 binuptime(&b0); 865 binuptime(&b1); 866 u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 867 for (i = 1; i < 1000; i++) 868 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 869 binuptime(&b2); 870 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 871 872 bintime_sub(&b2, &b1); 873 bintime_sub(&b1, &b0); 874 bintime_sub(&b2, &b1); 875 bintime2timespec(&b2, &ts); 876 877 device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n", 878 (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); 879 880 device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); 881 } 882 883 #ifdef DEV_APIC 884 static int 885 hpet_remap_intr(device_t dev, device_t child, u_int irq) 886 { 887 struct hpet_softc *sc = device_get_softc(dev); 888 struct hpet_timer *t; 889 uint64_t addr; 890 uint32_t data; 891 int error, i; 892 893 for (i = 0; i < sc->num_timers; i++) { 894 t = &sc->t[i]; 895 if (t->irq != irq) 896 continue; 897 error = PCIB_MAP_MSI( 898 device_get_parent(device_get_parent(dev)), dev, 899 irq, &addr, &data); 900 if (error) 901 return (error); 902 hpet_disable(sc); /* Stop timer to avoid interrupt loss. */ 903 bus_write_4(sc->mem_res, HPET_TIMER_FSB_ADDR(i), addr); 904 bus_write_4(sc->mem_res, HPET_TIMER_FSB_VAL(i), data); 905 hpet_enable(sc); 906 return (0); 907 } 908 return (ENOENT); 909 } 910 #endif 911 912 static device_method_t hpet_methods[] = { 913 /* Device interface */ 914 DEVMETHOD(device_identify, hpet_identify), 915 DEVMETHOD(device_probe, hpet_probe), 916 DEVMETHOD(device_attach, hpet_attach), 917 DEVMETHOD(device_detach, hpet_detach), 918 DEVMETHOD(device_suspend, hpet_suspend), 919 DEVMETHOD(device_resume, hpet_resume), 920 921 #ifdef DEV_APIC 922 DEVMETHOD(bus_remap_intr, hpet_remap_intr), 923 #endif 924 925 DEVMETHOD_END 926 }; 927 928 static driver_t hpet_driver = { 929 "hpet", 930 hpet_methods, 931 sizeof(struct hpet_softc), 932 }; 933 934 DRIVER_MODULE(hpet, acpi, hpet_driver, hpet_devclass, 0, 0); 935 MODULE_DEPEND(hpet, acpi, 1, 1, 1);
Cache object: ca6decde3ea511460aac083fe6bd6a49
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