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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: releng/11.0/sys/dev/acpica/acpi_hpet.c 297000 2016-03-18 01:28:41Z jhibbits $"); 30 31 #include "opt_acpi.h" 32 #if defined(__amd64__) 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 uint32_t acpi_uid; 89 uint64_t freq; 90 uint32_t caps; 91 struct timecounter tc; 92 struct hpet_timer { 93 struct eventtimer et; 94 struct hpet_softc *sc; 95 int num; 96 int mode; 97 int intr_rid; 98 int irq; 99 int pcpu_cpu; 100 int pcpu_misrouted; 101 int pcpu_master; 102 int pcpu_slaves[MAXCPU]; 103 struct resource *intr_res; 104 void *intr_handle; 105 uint32_t caps; 106 uint32_t vectors; 107 uint32_t div; 108 uint32_t next; 109 char name[8]; 110 } t[32]; 111 int num_timers; 112 struct cdev *pdev; 113 int mmap_allow; 114 int mmap_allow_write; 115 }; 116 117 static d_open_t hpet_open; 118 static d_mmap_t hpet_mmap; 119 120 static struct cdevsw hpet_cdevsw = { 121 .d_version = D_VERSION, 122 .d_name = "hpet", 123 .d_open = hpet_open, 124 .d_mmap = hpet_mmap, 125 }; 126 127 static u_int hpet_get_timecount(struct timecounter *tc); 128 static void hpet_test(struct hpet_softc *sc); 129 130 static char *hpet_ids[] = { "PNP0103", NULL }; 131 132 /* Knob to disable acpi_hpet device */ 133 bool acpi_hpet_disabled = false; 134 135 static u_int 136 hpet_get_timecount(struct timecounter *tc) 137 { 138 struct hpet_softc *sc; 139 140 sc = tc->tc_priv; 141 return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER)); 142 } 143 144 static void 145 hpet_enable(struct hpet_softc *sc) 146 { 147 uint32_t val; 148 149 val = bus_read_4(sc->mem_res, HPET_CONFIG); 150 if (sc->legacy_route) 151 val |= HPET_CNF_LEG_RT; 152 else 153 val &= ~HPET_CNF_LEG_RT; 154 val |= HPET_CNF_ENABLE; 155 bus_write_4(sc->mem_res, HPET_CONFIG, val); 156 } 157 158 static void 159 hpet_disable(struct hpet_softc *sc) 160 { 161 uint32_t val; 162 163 val = bus_read_4(sc->mem_res, HPET_CONFIG); 164 val &= ~HPET_CNF_ENABLE; 165 bus_write_4(sc->mem_res, HPET_CONFIG, val); 166 } 167 168 static int 169 hpet_start(struct eventtimer *et, sbintime_t first, sbintime_t period) 170 { 171 struct hpet_timer *mt = (struct hpet_timer *)et->et_priv; 172 struct hpet_timer *t; 173 struct hpet_softc *sc = mt->sc; 174 uint32_t fdiv, now; 175 176 t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]]; 177 if (period != 0) { 178 t->mode = 1; 179 t->div = (sc->freq * period) >> 32; 180 } else { 181 t->mode = 2; 182 t->div = 0; 183 } 184 if (first != 0) 185 fdiv = (sc->freq * first) >> 32; 186 else 187 fdiv = t->div; 188 if (t->irq < 0) 189 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num); 190 t->caps |= HPET_TCNF_INT_ENB; 191 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 192 restart: 193 t->next = now + fdiv; 194 if (t->mode == 1 && (t->caps & HPET_TCAP_PER_INT)) { 195 t->caps |= HPET_TCNF_TYPE; 196 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 197 t->caps | HPET_TCNF_VAL_SET); 198 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 199 t->next); 200 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 201 t->div); 202 } else { 203 t->caps &= ~HPET_TCNF_TYPE; 204 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 205 t->caps); 206 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 207 t->next); 208 } 209 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 210 if ((int32_t)(now - t->next + HPET_MIN_CYCLES) >= 0) { 211 fdiv *= 2; 212 goto restart; 213 } 214 return (0); 215 } 216 217 static int 218 hpet_stop(struct eventtimer *et) 219 { 220 struct hpet_timer *mt = (struct hpet_timer *)et->et_priv; 221 struct hpet_timer *t; 222 struct hpet_softc *sc = mt->sc; 223 224 t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]]; 225 t->mode = 0; 226 t->caps &= ~(HPET_TCNF_INT_ENB | HPET_TCNF_TYPE); 227 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps); 228 return (0); 229 } 230 231 static int 232 hpet_intr_single(void *arg) 233 { 234 struct hpet_timer *t = (struct hpet_timer *)arg; 235 struct hpet_timer *mt; 236 struct hpet_softc *sc = t->sc; 237 uint32_t now; 238 239 if (t->mode == 0) 240 return (FILTER_STRAY); 241 /* Check that per-CPU timer interrupt reached right CPU. */ 242 if (t->pcpu_cpu >= 0 && t->pcpu_cpu != curcpu) { 243 if ((++t->pcpu_misrouted) % 32 == 0) { 244 printf("HPET interrupt routed to the wrong CPU" 245 " (timer %d CPU %d -> %d)!\n", 246 t->num, t->pcpu_cpu, curcpu); 247 } 248 249 /* 250 * Reload timer, hoping that next time may be more lucky 251 * (system will manage proper interrupt binding). 252 */ 253 if ((t->mode == 1 && (t->caps & HPET_TCAP_PER_INT) == 0) || 254 t->mode == 2) { 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 == 1 && 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 == 2) 271 t->mode = 0; 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 uint32_t 300 hpet_get_uid(device_t dev) 301 { 302 struct hpet_softc *sc; 303 304 sc = device_get_softc(dev); 305 return (sc->acpi_uid); 306 } 307 308 static ACPI_STATUS 309 hpet_find(ACPI_HANDLE handle, UINT32 level, void *context, 310 void **status) 311 { 312 char **ids; 313 uint32_t id = (uint32_t)(uintptr_t)context; 314 uint32_t uid = 0; 315 316 for (ids = hpet_ids; *ids != NULL; ids++) { 317 if (acpi_MatchHid(handle, *ids)) 318 break; 319 } 320 if (*ids == NULL) 321 return (AE_OK); 322 if (ACPI_FAILURE(acpi_GetInteger(handle, "_UID", &uid)) || 323 id == uid) 324 *status = acpi_get_device(handle); 325 return (AE_OK); 326 } 327 328 /* 329 * Find an existing IRQ resource that matches the requested IRQ range 330 * and return its RID. If one is not found, use a new RID. 331 */ 332 static int 333 hpet_find_irq_rid(device_t dev, u_long start, u_long end) 334 { 335 rman_res_t irq; 336 int error, rid; 337 338 for (rid = 0;; rid++) { 339 error = bus_get_resource(dev, SYS_RES_IRQ, rid, &irq, NULL); 340 if (error != 0 || (start <= irq && irq <= end)) 341 return (rid); 342 } 343 } 344 345 static int 346 hpet_open(struct cdev *cdev, int oflags, int devtype, struct thread *td) 347 { 348 struct hpet_softc *sc; 349 350 sc = cdev->si_drv1; 351 if (!sc->mmap_allow) 352 return (EPERM); 353 else 354 return (0); 355 } 356 357 static int 358 hpet_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, 359 int nprot, vm_memattr_t *memattr) 360 { 361 struct hpet_softc *sc; 362 363 sc = cdev->si_drv1; 364 if (offset > rman_get_size(sc->mem_res)) 365 return (EINVAL); 366 if (!sc->mmap_allow_write && (nprot & PROT_WRITE)) 367 return (EPERM); 368 *paddr = rman_get_start(sc->mem_res) + offset; 369 *memattr = VM_MEMATTR_UNCACHEABLE; 370 371 return (0); 372 } 373 374 /* Discover the HPET via the ACPI table of the same name. */ 375 static void 376 hpet_identify(driver_t *driver, device_t parent) 377 { 378 ACPI_TABLE_HPET *hpet; 379 ACPI_STATUS status; 380 device_t child; 381 int i; 382 383 /* Only one HPET device can be added. */ 384 if (devclass_get_device(hpet_devclass, 0)) 385 return; 386 for (i = 1; ; i++) { 387 /* Search for HPET table. */ 388 status = AcpiGetTable(ACPI_SIG_HPET, i, (ACPI_TABLE_HEADER **)&hpet); 389 if (ACPI_FAILURE(status)) 390 return; 391 /* Search for HPET device with same ID. */ 392 child = NULL; 393 AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 394 100, hpet_find, NULL, (void *)(uintptr_t)hpet->Sequence, 395 (void *)&child); 396 /* If found - let it be probed in normal way. */ 397 if (child) { 398 if (bus_get_resource(child, SYS_RES_MEMORY, 0, 399 NULL, NULL) != 0) 400 bus_set_resource(child, SYS_RES_MEMORY, 0, 401 hpet->Address.Address, HPET_MEM_WIDTH); 402 continue; 403 } 404 /* If not - create it from table info. */ 405 child = BUS_ADD_CHILD(parent, 2, "hpet", 0); 406 if (child == NULL) { 407 printf("%s: can't add child\n", __func__); 408 continue; 409 } 410 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address, 411 HPET_MEM_WIDTH); 412 } 413 } 414 415 static int 416 hpet_probe(device_t dev) 417 { 418 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 419 420 if (acpi_disabled("hpet") || acpi_hpet_disabled) 421 return (ENXIO); 422 if (acpi_get_handle(dev) != NULL && 423 ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL) 424 return (ENXIO); 425 426 device_set_desc(dev, "High Precision Event Timer"); 427 return (0); 428 } 429 430 static int 431 hpet_attach(device_t dev) 432 { 433 struct hpet_softc *sc; 434 struct hpet_timer *t; 435 struct make_dev_args mda; 436 int i, j, num_msi, num_timers, num_percpu_et, num_percpu_t, cur_cpu; 437 int pcpu_master, error; 438 static int maxhpetet = 0; 439 uint32_t val, val2, cvectors, dvectors; 440 uint16_t vendor, rev; 441 442 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 443 444 sc = device_get_softc(dev); 445 sc->dev = dev; 446 sc->handle = acpi_get_handle(dev); 447 448 sc->mem_rid = 0; 449 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->mem_rid, 450 RF_ACTIVE); 451 if (sc->mem_res == NULL) 452 return (ENOMEM); 453 454 /* Validate that we can access the whole region. */ 455 if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) { 456 device_printf(dev, "memory region width %jd too small\n", 457 rman_get_size(sc->mem_res)); 458 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 459 return (ENXIO); 460 } 461 462 /* Be sure timer is enabled. */ 463 hpet_enable(sc); 464 465 /* Read basic statistics about the timer. */ 466 val = bus_read_4(sc->mem_res, HPET_PERIOD); 467 if (val == 0) { 468 device_printf(dev, "invalid period\n"); 469 hpet_disable(sc); 470 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 471 return (ENXIO); 472 } 473 474 sc->freq = (1000000000000000LL + val / 2) / val; 475 sc->caps = bus_read_4(sc->mem_res, HPET_CAPABILITIES); 476 vendor = (sc->caps & HPET_CAP_VENDOR_ID) >> 16; 477 rev = sc->caps & HPET_CAP_REV_ID; 478 num_timers = 1 + ((sc->caps & HPET_CAP_NUM_TIM) >> 8); 479 /* 480 * ATI/AMD violates IA-PC HPET (High Precision Event Timers) 481 * Specification and provides an off by one number 482 * of timers/comparators. 483 * Additionally, they use unregistered value in VENDOR_ID field. 484 */ 485 if (vendor == HPET_VENDID_AMD && rev < 0x10 && num_timers > 0) 486 num_timers--; 487 sc->num_timers = num_timers; 488 if (bootverbose) { 489 device_printf(dev, 490 "vendor 0x%x, rev 0x%x, %jdHz%s, %d timers,%s\n", 491 vendor, rev, sc->freq, 492 (sc->caps & HPET_CAP_COUNT_SIZE) ? " 64bit" : "", 493 num_timers, 494 (sc->caps & HPET_CAP_LEG_RT) ? " legacy route" : ""); 495 } 496 for (i = 0; i < num_timers; i++) { 497 t = &sc->t[i]; 498 t->sc = sc; 499 t->num = i; 500 t->mode = 0; 501 t->intr_rid = -1; 502 t->irq = -1; 503 t->pcpu_cpu = -1; 504 t->pcpu_misrouted = 0; 505 t->pcpu_master = -1; 506 t->caps = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i)); 507 t->vectors = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i) + 4); 508 if (bootverbose) { 509 device_printf(dev, 510 " t%d: irqs 0x%08x (%d)%s%s%s\n", i, 511 t->vectors, (t->caps & HPET_TCNF_INT_ROUTE) >> 9, 512 (t->caps & HPET_TCAP_FSB_INT_DEL) ? ", MSI" : "", 513 (t->caps & HPET_TCAP_SIZE) ? ", 64bit" : "", 514 (t->caps & HPET_TCAP_PER_INT) ? ", periodic" : ""); 515 } 516 } 517 if (testenv("debug.acpi.hpet_test")) 518 hpet_test(sc); 519 /* 520 * Don't attach if the timer never increments. Since the spec 521 * requires it to be at least 10 MHz, it has to change in 1 us. 522 */ 523 val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 524 DELAY(1); 525 val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 526 if (val == val2) { 527 device_printf(dev, "HPET never increments, disabling\n"); 528 hpet_disable(sc); 529 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 530 return (ENXIO); 531 } 532 /* Announce first HPET as timecounter. */ 533 if (device_get_unit(dev) == 0) { 534 sc->tc.tc_get_timecount = hpet_get_timecount, 535 sc->tc.tc_counter_mask = ~0u, 536 sc->tc.tc_name = "HPET", 537 sc->tc.tc_quality = 950, 538 sc->tc.tc_frequency = sc->freq; 539 sc->tc.tc_priv = sc; 540 tc_init(&sc->tc); 541 } 542 /* If not disabled - setup and announce event timers. */ 543 if (resource_int_value(device_get_name(dev), device_get_unit(dev), 544 "clock", &i) == 0 && i == 0) 545 return (0); 546 547 /* Check whether we can and want legacy routing. */ 548 sc->legacy_route = 0; 549 resource_int_value(device_get_name(dev), device_get_unit(dev), 550 "legacy_route", &sc->legacy_route); 551 if ((sc->caps & HPET_CAP_LEG_RT) == 0) 552 sc->legacy_route = 0; 553 if (sc->legacy_route) { 554 sc->t[0].vectors = 0; 555 sc->t[1].vectors = 0; 556 } 557 558 /* Check what IRQs we want use. */ 559 /* By default allow any PCI IRQs. */ 560 sc->allowed_irqs = 0xffff0000; 561 /* 562 * HPETs in AMD chipsets before SB800 have problems with IRQs >= 16 563 * Lower are also not always working for different reasons. 564 * SB800 fixed it, but seems do not implements level triggering 565 * properly, that makes it very unreliable - it freezes after any 566 * interrupt loss. Avoid legacy IRQs for AMD. 567 */ 568 if (vendor == HPET_VENDID_AMD || vendor == HPET_VENDID_AMD2) 569 sc->allowed_irqs = 0x00000000; 570 /* 571 * NVidia MCP5x chipsets have number of unexplained interrupt 572 * problems. For some reason, using HPET interrupts breaks HDA sound. 573 */ 574 if (vendor == HPET_VENDID_NVIDIA && rev <= 0x01) 575 sc->allowed_irqs = 0x00000000; 576 /* 577 * ServerWorks HT1000 reported to have problems with IRQs >= 16. 578 * Lower IRQs are working, but allowed mask is not set correctly. 579 * Legacy_route mode works fine. 580 */ 581 if (vendor == HPET_VENDID_SW && rev <= 0x01) 582 sc->allowed_irqs = 0x00000000; 583 /* 584 * Neither QEMU nor VirtualBox report supported IRQs correctly. 585 * The only way to use HPET there is to specify IRQs manually 586 * and/or use legacy_route. Legacy_route mode works on both. 587 */ 588 if (vm_guest) 589 sc->allowed_irqs = 0x00000000; 590 /* Let user override. */ 591 resource_int_value(device_get_name(dev), device_get_unit(dev), 592 "allowed_irqs", &sc->allowed_irqs); 593 594 /* Get how much per-CPU timers we should try to provide. */ 595 sc->per_cpu = 1; 596 resource_int_value(device_get_name(dev), device_get_unit(dev), 597 "per_cpu", &sc->per_cpu); 598 599 num_msi = 0; 600 sc->useirq = 0; 601 /* Find IRQ vectors for all timers. */ 602 cvectors = sc->allowed_irqs & 0xffff0000; 603 dvectors = sc->allowed_irqs & 0x0000ffff; 604 if (sc->legacy_route) 605 dvectors &= 0x0000fefe; 606 for (i = 0; i < num_timers; i++) { 607 t = &sc->t[i]; 608 if (sc->legacy_route && i < 2) 609 t->irq = (i == 0) ? 0 : 8; 610 #ifdef DEV_APIC 611 else if (t->caps & HPET_TCAP_FSB_INT_DEL) { 612 if ((j = PCIB_ALLOC_MSIX( 613 device_get_parent(device_get_parent(dev)), dev, 614 &t->irq))) { 615 device_printf(dev, 616 "Can't allocate interrupt for t%d: %d\n", 617 i, j); 618 } 619 } 620 #endif 621 else if (dvectors & t->vectors) { 622 t->irq = ffs(dvectors & t->vectors) - 1; 623 dvectors &= ~(1 << t->irq); 624 } 625 if (t->irq >= 0) { 626 t->intr_rid = hpet_find_irq_rid(dev, t->irq, t->irq); 627 t->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ, 628 &t->intr_rid, t->irq, t->irq, 1, RF_ACTIVE); 629 if (t->intr_res == NULL) { 630 t->irq = -1; 631 device_printf(dev, 632 "Can't map interrupt for t%d.\n", i); 633 } else if (bus_setup_intr(dev, t->intr_res, 634 INTR_TYPE_CLK, hpet_intr_single, NULL, t, 635 &t->intr_handle) != 0) { 636 t->irq = -1; 637 device_printf(dev, 638 "Can't setup interrupt for t%d.\n", i); 639 } else { 640 bus_describe_intr(dev, t->intr_res, 641 t->intr_handle, "t%d", i); 642 num_msi++; 643 } 644 } 645 if (t->irq < 0 && (cvectors & t->vectors) != 0) { 646 cvectors &= t->vectors; 647 sc->useirq |= (1 << i); 648 } 649 } 650 if (sc->legacy_route && sc->t[0].irq < 0 && sc->t[1].irq < 0) 651 sc->legacy_route = 0; 652 if (sc->legacy_route) 653 hpet_enable(sc); 654 /* Group timers for per-CPU operation. */ 655 num_percpu_et = min(num_msi / mp_ncpus, sc->per_cpu); 656 num_percpu_t = num_percpu_et * mp_ncpus; 657 pcpu_master = 0; 658 cur_cpu = CPU_FIRST(); 659 for (i = 0; i < num_timers; i++) { 660 t = &sc->t[i]; 661 if (t->irq >= 0 && num_percpu_t > 0) { 662 if (cur_cpu == CPU_FIRST()) 663 pcpu_master = i; 664 t->pcpu_cpu = cur_cpu; 665 t->pcpu_master = pcpu_master; 666 sc->t[pcpu_master]. 667 pcpu_slaves[cur_cpu] = i; 668 bus_bind_intr(dev, t->intr_res, cur_cpu); 669 cur_cpu = CPU_NEXT(cur_cpu); 670 num_percpu_t--; 671 } else if (t->irq >= 0) 672 bus_bind_intr(dev, t->intr_res, CPU_FIRST()); 673 } 674 bus_write_4(sc->mem_res, HPET_ISR, 0xffffffff); 675 sc->irq = -1; 676 /* If at least one timer needs legacy IRQ - set it up. */ 677 if (sc->useirq) { 678 j = i = fls(cvectors) - 1; 679 while (j > 0 && (cvectors & (1 << (j - 1))) != 0) 680 j--; 681 sc->intr_rid = hpet_find_irq_rid(dev, j, i); 682 sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ, 683 &sc->intr_rid, j, i, 1, RF_SHAREABLE | RF_ACTIVE); 684 if (sc->intr_res == NULL) 685 device_printf(dev, "Can't map interrupt.\n"); 686 else if (bus_setup_intr(dev, sc->intr_res, INTR_TYPE_CLK, 687 hpet_intr, NULL, sc, &sc->intr_handle) != 0) { 688 device_printf(dev, "Can't setup interrupt.\n"); 689 } else { 690 sc->irq = rman_get_start(sc->intr_res); 691 /* Bind IRQ to BSP to avoid live migration. */ 692 bus_bind_intr(dev, sc->intr_res, CPU_FIRST()); 693 } 694 } 695 /* Program and announce event timers. */ 696 for (i = 0; i < num_timers; i++) { 697 t = &sc->t[i]; 698 t->caps &= ~(HPET_TCNF_FSB_EN | HPET_TCNF_INT_ROUTE); 699 t->caps &= ~(HPET_TCNF_VAL_SET | HPET_TCNF_INT_ENB); 700 t->caps &= ~(HPET_TCNF_INT_TYPE); 701 t->caps |= HPET_TCNF_32MODE; 702 if (t->irq >= 0 && sc->legacy_route && i < 2) { 703 /* Legacy route doesn't need more configuration. */ 704 } else 705 #ifdef DEV_APIC 706 if ((t->caps & HPET_TCAP_FSB_INT_DEL) && t->irq >= 0) { 707 uint64_t addr; 708 uint32_t data; 709 710 if (PCIB_MAP_MSI( 711 device_get_parent(device_get_parent(dev)), dev, 712 t->irq, &addr, &data) == 0) { 713 bus_write_4(sc->mem_res, 714 HPET_TIMER_FSB_ADDR(i), addr); 715 bus_write_4(sc->mem_res, 716 HPET_TIMER_FSB_VAL(i), data); 717 t->caps |= HPET_TCNF_FSB_EN; 718 } else 719 t->irq = -2; 720 } else 721 #endif 722 if (t->irq >= 0) 723 t->caps |= (t->irq << 9); 724 else if (sc->irq >= 0 && (t->vectors & (1 << sc->irq))) 725 t->caps |= (sc->irq << 9) | HPET_TCNF_INT_TYPE; 726 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(i), t->caps); 727 /* Skip event timers without set up IRQ. */ 728 if (t->irq < 0 && 729 (sc->irq < 0 || (t->vectors & (1 << sc->irq)) == 0)) 730 continue; 731 /* Announce the reset. */ 732 if (maxhpetet == 0) 733 t->et.et_name = "HPET"; 734 else { 735 sprintf(t->name, "HPET%d", maxhpetet); 736 t->et.et_name = t->name; 737 } 738 t->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT; 739 t->et.et_quality = 450; 740 if (t->pcpu_master >= 0) { 741 t->et.et_flags |= ET_FLAGS_PERCPU; 742 t->et.et_quality += 100; 743 } else if (mp_ncpus >= 8) 744 t->et.et_quality -= 100; 745 if ((t->caps & HPET_TCAP_PER_INT) == 0) 746 t->et.et_quality -= 10; 747 t->et.et_frequency = sc->freq; 748 t->et.et_min_period = 749 ((uint64_t)(HPET_MIN_CYCLES * 2) << 32) / sc->freq; 750 t->et.et_max_period = (0xfffffffeLLU << 32) / sc->freq; 751 t->et.et_start = hpet_start; 752 t->et.et_stop = hpet_stop; 753 t->et.et_priv = &sc->t[i]; 754 if (t->pcpu_master < 0 || t->pcpu_master == i) { 755 et_register(&t->et); 756 maxhpetet++; 757 } 758 } 759 acpi_GetInteger(sc->handle, "_UID", &sc->acpi_uid); 760 761 make_dev_args_init(&mda); 762 mda.mda_devsw = &hpet_cdevsw; 763 mda.mda_uid = UID_ROOT; 764 mda.mda_gid = GID_WHEEL; 765 mda.mda_mode = 0600; 766 mda.mda_si_drv1 = sc; 767 error = make_dev_s(&mda, &sc->pdev, "hpet%d", device_get_unit(dev)); 768 if (error == 0) { 769 sc->mmap_allow = 1; 770 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow", 771 &sc->mmap_allow); 772 sc->mmap_allow_write = 1; 773 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow_write", 774 &sc->mmap_allow_write); 775 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), 776 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 777 OID_AUTO, "mmap_allow", 778 CTLFLAG_RW, &sc->mmap_allow, 0, 779 "Allow userland to memory map HPET"); 780 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), 781 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 782 OID_AUTO, "mmap_allow_write", 783 CTLFLAG_RW, &sc->mmap_allow_write, 0, 784 "Allow userland write to the HPET register space"); 785 } else { 786 device_printf(dev, "could not create /dev/hpet%d, error %d\n", 787 device_get_unit(dev), error); 788 } 789 790 return (0); 791 } 792 793 static int 794 hpet_detach(device_t dev) 795 { 796 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 797 798 /* XXX Without a tc_remove() function, we can't detach. */ 799 return (EBUSY); 800 } 801 802 static int 803 hpet_suspend(device_t dev) 804 { 805 // struct hpet_softc *sc; 806 807 /* 808 * Disable the timer during suspend. The timer will not lose 809 * its state in S1 or S2, but we are required to disable 810 * it. 811 */ 812 // sc = device_get_softc(dev); 813 // hpet_disable(sc); 814 815 return (0); 816 } 817 818 static int 819 hpet_resume(device_t dev) 820 { 821 struct hpet_softc *sc; 822 struct hpet_timer *t; 823 int i; 824 825 /* Re-enable the timer after a resume to keep the clock advancing. */ 826 sc = device_get_softc(dev); 827 hpet_enable(sc); 828 /* Restart event timers that were running on suspend. */ 829 for (i = 0; i < sc->num_timers; i++) { 830 t = &sc->t[i]; 831 #ifdef DEV_APIC 832 if (t->irq >= 0 && (sc->legacy_route == 0 || i >= 2)) { 833 uint64_t addr; 834 uint32_t data; 835 836 if (PCIB_MAP_MSI( 837 device_get_parent(device_get_parent(dev)), dev, 838 t->irq, &addr, &data) == 0) { 839 bus_write_4(sc->mem_res, 840 HPET_TIMER_FSB_ADDR(i), addr); 841 bus_write_4(sc->mem_res, 842 HPET_TIMER_FSB_VAL(i), data); 843 } 844 } 845 #endif 846 if (t->mode == 0) 847 continue; 848 t->next = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 849 if (t->mode == 1 && (t->caps & HPET_TCAP_PER_INT)) { 850 t->caps |= HPET_TCNF_TYPE; 851 t->next += t->div; 852 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), 853 t->caps | HPET_TCNF_VAL_SET); 854 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 855 t->next); 856 bus_read_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num)); 857 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 858 t->div); 859 } else { 860 t->next += sc->freq / 1024; 861 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num), 862 t->next); 863 } 864 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num); 865 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps); 866 } 867 return (0); 868 } 869 870 /* Print some basic latency/rate information to assist in debugging. */ 871 static void 872 hpet_test(struct hpet_softc *sc) 873 { 874 int i; 875 uint32_t u1, u2; 876 struct bintime b0, b1, b2; 877 struct timespec ts; 878 879 binuptime(&b0); 880 binuptime(&b0); 881 binuptime(&b1); 882 u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 883 for (i = 1; i < 1000; i++) 884 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 885 binuptime(&b2); 886 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 887 888 bintime_sub(&b2, &b1); 889 bintime_sub(&b1, &b0); 890 bintime_sub(&b2, &b1); 891 bintime2timespec(&b2, &ts); 892 893 device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n", 894 (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); 895 896 device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); 897 } 898 899 #ifdef DEV_APIC 900 static int 901 hpet_remap_intr(device_t dev, device_t child, u_int irq) 902 { 903 struct hpet_softc *sc = device_get_softc(dev); 904 struct hpet_timer *t; 905 uint64_t addr; 906 uint32_t data; 907 int error, i; 908 909 for (i = 0; i < sc->num_timers; i++) { 910 t = &sc->t[i]; 911 if (t->irq != irq) 912 continue; 913 error = PCIB_MAP_MSI( 914 device_get_parent(device_get_parent(dev)), dev, 915 irq, &addr, &data); 916 if (error) 917 return (error); 918 hpet_disable(sc); /* Stop timer to avoid interrupt loss. */ 919 bus_write_4(sc->mem_res, HPET_TIMER_FSB_ADDR(i), addr); 920 bus_write_4(sc->mem_res, HPET_TIMER_FSB_VAL(i), data); 921 hpet_enable(sc); 922 return (0); 923 } 924 return (ENOENT); 925 } 926 #endif 927 928 static device_method_t hpet_methods[] = { 929 /* Device interface */ 930 DEVMETHOD(device_identify, hpet_identify), 931 DEVMETHOD(device_probe, hpet_probe), 932 DEVMETHOD(device_attach, hpet_attach), 933 DEVMETHOD(device_detach, hpet_detach), 934 DEVMETHOD(device_suspend, hpet_suspend), 935 DEVMETHOD(device_resume, hpet_resume), 936 937 #ifdef DEV_APIC 938 DEVMETHOD(bus_remap_intr, hpet_remap_intr), 939 #endif 940 941 DEVMETHOD_END 942 }; 943 944 static driver_t hpet_driver = { 945 "hpet", 946 hpet_methods, 947 sizeof(struct hpet_softc), 948 }; 949 950 DRIVER_MODULE(hpet, acpi, hpet_driver, hpet_devclass, 0, 0); 951 MODULE_DEPEND(hpet, acpi, 1, 1, 1);
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