sys/dev/acpica/acpi_hpet.c

   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
  33 #if defined(__amd64__)
  34 #define DEV_APIC
  35 #else
  36 #include "opt_apic.h"
  37 #endif
  38 #include <sys/param.h>
  39 #include <sys/conf.h>
  40 #include <sys/bus.h>
  41 #include <sys/kernel.h>
  42 #include <sys/module.h>
  43 #include <sys/proc.h>
  44 #include <sys/rman.h>
  45 #include <sys/mman.h>
  46 #include <sys/time.h>
  47 #include <sys/smp.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/timeet.h>
  50 #include <sys/timetc.h>
  51 #include <sys/vdso.h>
  52
  53 #include <contrib/dev/acpica/include/acpi.h>
  54 #include <contrib/dev/acpica/include/accommon.h>
  55
  56 #include <dev/acpica/acpivar.h>
  57 #include <dev/acpica/acpi_hpet.h>
  58
  59 #ifdef DEV_APIC
  60 #include "pcib_if.h"
  61 #endif
  62
  63 #define HPET_VENDID_AMD         0x4353
  64 #define HPET_VENDID_AMD2        0x1022
  65 #define HPET_VENDID_INTEL       0x8086
  66 #define HPET_VENDID_NVIDIA      0x10de
  67 #define HPET_VENDID_SW          0x1166
  68
  69 ACPI_SERIAL_DECL(hpet, "ACPI HPET support");
  70
  71 static devclass_t hpet_devclass;
  72
  73 /* ACPI CA debugging */
  74 #define _COMPONENT      ACPI_TIMER
  75 ACPI_MODULE_NAME("HPET")
  76
  77 struct hpet_softc {
  78         device_t                dev;
  79         int                     mem_rid;
  80         int                     intr_rid;
  81         int                     irq;
  82         int                     useirq;
  83         int                     legacy_route;
  84         int                     per_cpu;
  85         uint32_t                allowed_irqs;
  86         struct resource         *mem_res;
  87         struct resource         *intr_res;
  88         void                    *intr_handle;
  89         ACPI_HANDLE             handle;
  90         uint32_t                acpi_uid;
  91         uint64_t                freq;
  92         uint32_t                caps;
  93         struct timecounter      tc;
  94         struct hpet_timer {
  95                 struct eventtimer       et;
  96                 struct hpet_softc       *sc;
  97                 int                     num;
  98                 int                     mode;
  99 #define TIMER_STOPPED   0
 100 #define TIMER_PERIODIC  1
 101 #define TIMER_ONESHOT   2
 102                 int                     intr_rid;
 103                 int                     irq;
 104                 int                     pcpu_cpu;
 105                 int                     pcpu_misrouted;
 106                 int                     pcpu_master;
 107                 int                     pcpu_slaves[MAXCPU];
 108                 struct resource         *intr_res;
 109                 void                    *intr_handle;
 110                 uint32_t                caps;
 111                 uint32_t                vectors;
 112                 uint32_t                div;
 113                 uint32_t                next;
 114                 char                    name[8];
 115         }                       t[32];
 116         int                     num_timers;
 117         struct cdev             *pdev;
 118         int                     mmap_allow;
 119         int                     mmap_allow_write;
 120 };
 121
 122 static d_open_t hpet_open;
 123 static d_mmap_t hpet_mmap;
 124
 125 static struct cdevsw hpet_cdevsw = {
 126         .d_version =    D_VERSION,
 127         .d_name =       "hpet",
 128         .d_open =       hpet_open,
 129         .d_mmap =       hpet_mmap,
 130 };
 131
 132 static u_int hpet_get_timecount(struct timecounter *tc);
 133 static void hpet_test(struct hpet_softc *sc);
 134
 135 static char *hpet_ids[] = { "PNP0103", NULL };
 136
 137 /* Knob to disable acpi_hpet device */
 138 bool acpi_hpet_disabled = false;
 139
 140 static u_int
 141 hpet_get_timecount(struct timecounter *tc)
 142 {
 143         struct hpet_softc *sc;
 144
 145         sc = tc->tc_priv;
 146         return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER));
 147 }
 148
 149 uint32_t
 150 hpet_vdso_timehands(struct vdso_timehands *vdso_th, struct timecounter *tc)
 151 {
 152         struct hpet_softc *sc;
 153
 154         sc = tc->tc_priv;
 155         vdso_th->th_algo = VDSO_TH_ALGO_X86_HPET;
 156         vdso_th->th_x86_shift = 0;
 157         vdso_th->th_x86_hpet_idx = device_get_unit(sc->dev);
 158         bzero(vdso_th->th_res, sizeof(vdso_th->th_res));
 159         return (sc->mmap_allow != 0);
 160 }
 161
 162 #ifdef COMPAT_FREEBSD32
 163 uint32_t
 164 hpet_vdso_timehands32(struct vdso_timehands32 *vdso_th32,
 165     struct timecounter *tc)
 166 {
 167         struct hpet_softc *sc;
 168
 169         sc = tc->tc_priv;
 170         vdso_th32->th_algo = VDSO_TH_ALGO_X86_HPET;
 171         vdso_th32->th_x86_shift = 0;
 172         vdso_th32->th_x86_hpet_idx = device_get_unit(sc->dev);
 173         bzero(vdso_th32->th_res, sizeof(vdso_th32->th_res));
 174         return (sc->mmap_allow != 0);
 175 }
 176 #endif
 177
 178 static void
 179 hpet_enable(struct hpet_softc *sc)
 180 {
 181         uint32_t val;
 182
 183         val = bus_read_4(sc->mem_res, HPET_CONFIG);
 184         if (sc->legacy_route)
 185                 val |= HPET_CNF_LEG_RT;
 186         else
 187                 val &= ~HPET_CNF_LEG_RT;
 188         val |= HPET_CNF_ENABLE;
 189         bus_write_4(sc->mem_res, HPET_CONFIG, val);
 190 }
 191
 192 static void
 193 hpet_disable(struct hpet_softc *sc)
 194 {
 195         uint32_t val;
 196
 197         val = bus_read_4(sc->mem_res, HPET_CONFIG);
 198         val &= ~HPET_CNF_ENABLE;
 199         bus_write_4(sc->mem_res, HPET_CONFIG, val);
 200 }
 201
 202 static int
 203 hpet_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
 204 {
 205         struct hpet_timer *mt = (struct hpet_timer *)et->et_priv;
 206         struct hpet_timer *t;
 207         struct hpet_softc *sc = mt->sc;
 208         uint32_t fdiv, now;
 209
 210         t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]];
 211         if (period != 0) {
 212                 t->mode = TIMER_PERIODIC;
 213                 t->div = (sc->freq * period) >> 32;
 214         } else {
 215                 t->mode = TIMER_ONESHOT;
 216                 t->div = 0;
 217         }
 218         if (first != 0)
 219                 fdiv = (sc->freq * first) >> 32;
 220         else
 221                 fdiv = t->div;
 222         if (t->irq < 0)
 223                 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num);
 224         t->caps |= HPET_TCNF_INT_ENB;
 225         now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 226 restart:
 227         t->next = now + fdiv;
 228         if (t->mode == TIMER_PERIODIC && (t->caps & HPET_TCAP_PER_INT)) {
 229                 t->caps |= HPET_TCNF_TYPE;
 230                 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num),
 231                     t->caps | HPET_TCNF_VAL_SET);
 232                 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 233                     t->next);
 234                 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 235                     t->div);
 236         } else {
 237                 t->caps &= ~HPET_TCNF_TYPE;
 238                 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num),
 239                     t->caps);
 240                 bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 241                     t->next);
 242         }
 243         now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 244         if ((int32_t)(now - t->next + HPET_MIN_CYCLES) >= 0) {
 245                 fdiv *= 2;
 246                 goto restart;
 247         }
 248         return (0);
 249 }
 250
 251 static int
 252 hpet_stop(struct eventtimer *et)
 253 {
 254         struct hpet_timer *mt = (struct hpet_timer *)et->et_priv;
 255         struct hpet_timer *t;
 256         struct hpet_softc *sc = mt->sc;
 257
 258         t = (mt->pcpu_master < 0) ? mt : &sc->t[mt->pcpu_slaves[curcpu]];
 259         t->mode = TIMER_STOPPED;
 260         t->caps &= ~(HPET_TCNF_INT_ENB | HPET_TCNF_TYPE);
 261         bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps);
 262         return (0);
 263 }
 264
 265 static int
 266 hpet_intr_single(void *arg)
 267 {
 268         struct hpet_timer *t = (struct hpet_timer *)arg;
 269         struct hpet_timer *mt;
 270         struct hpet_softc *sc = t->sc;
 271         uint32_t now;
 272
 273         if (t->mode == TIMER_STOPPED)
 274                 return (FILTER_STRAY);
 275         /* Check that per-CPU timer interrupt reached right CPU. */
 276         if (t->pcpu_cpu >= 0 && t->pcpu_cpu != curcpu) {
 277                 if ((++t->pcpu_misrouted) % 32 == 0) {
 278                         printf("HPET interrupt routed to the wrong CPU"
 279                             " (timer %d CPU %d -> %d)!\n",
 280                             t->num, t->pcpu_cpu, curcpu);
 281                 }
 282
 283                 /*
 284                  * Reload timer, hoping that next time may be more lucky
 285                  * (system will manage proper interrupt binding).
 286                  */
 287                 if ((t->mode == TIMER_PERIODIC &&
 288                     (t->caps & HPET_TCAP_PER_INT) == 0) ||
 289                     t->mode == TIMER_ONESHOT) {
 290                         t->next = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER) +
 291                             sc->freq / 8;
 292                         bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 293                             t->next);
 294                 }
 295                 return (FILTER_HANDLED);
 296         }
 297         if (t->mode == TIMER_PERIODIC &&
 298             (t->caps & HPET_TCAP_PER_INT) == 0) {
 299                 t->next += t->div;
 300                 now = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 301                 if ((int32_t)((now + t->div / 2) - t->next) > 0)
 302                         t->next = now + t->div / 2;
 303                 bus_write_4(sc->mem_res,
 304                     HPET_TIMER_COMPARATOR(t->num), t->next);
 305         } else if (t->mode == TIMER_ONESHOT)
 306                 t->mode = TIMER_STOPPED;
 307         mt = (t->pcpu_master < 0) ? t : &sc->t[t->pcpu_master];
 308         if (mt->et.et_active)
 309                 mt->et.et_event_cb(&mt->et, mt->et.et_arg);
 310         return (FILTER_HANDLED);
 311 }
 312
 313 static int
 314 hpet_intr(void *arg)
 315 {
 316         struct hpet_softc *sc = (struct hpet_softc *)arg;
 317         int i;
 318         uint32_t val;
 319
 320         val = bus_read_4(sc->mem_res, HPET_ISR);
 321         if (val) {
 322                 bus_write_4(sc->mem_res, HPET_ISR, val);
 323                 val &= sc->useirq;
 324                 for (i = 0; i < sc->num_timers; i++) {
 325                         if ((val & (1 << i)) == 0)
 326                                 continue;
 327                         hpet_intr_single(&sc->t[i]);
 328                 }
 329                 return (FILTER_HANDLED);
 330         }
 331         return (FILTER_STRAY);
 332 }
 333
 334 uint32_t
 335 hpet_get_uid(device_t dev)
 336 {
 337         struct hpet_softc *sc;
 338
 339         sc = device_get_softc(dev);
 340         return (sc->acpi_uid);
 341 }
 342
 343 static ACPI_STATUS
 344 hpet_find(ACPI_HANDLE handle, UINT32 level, void *context,
 345     void **status)
 346 {
 347         char            **ids;
 348         uint32_t        id = (uint32_t)(uintptr_t)context;
 349         uint32_t        uid = 0;
 350
 351         for (ids = hpet_ids; *ids != NULL; ids++) {
 352                 if (acpi_MatchHid(handle, *ids))
 353                         break;
 354         }
 355         if (*ids == NULL)
 356                 return (AE_OK);
 357         if (ACPI_FAILURE(acpi_GetInteger(handle, "_UID", &uid)) ||
 358             id == uid)
 359                 *status = acpi_get_device(handle);
 360         return (AE_OK);
 361 }
 362
 363 /*
 364  * Find an existing IRQ resource that matches the requested IRQ range
 365  * and return its RID.  If one is not found, use a new RID.
 366  */
 367 static int
 368 hpet_find_irq_rid(device_t dev, u_long start, u_long end)
 369 {
 370         rman_res_t irq;
 371         int error, rid;
 372
 373         for (rid = 0;; rid++) {
 374                 error = bus_get_resource(dev, SYS_RES_IRQ, rid, &irq, NULL);
 375                 if (error != 0 || (start <= irq && irq <= end))
 376                         return (rid);
 377         }
 378 }
 379
 380 static int
 381 hpet_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
 382 {
 383         struct hpet_softc *sc;
 384
 385         sc = cdev->si_drv1;
 386         if (!sc->mmap_allow)
 387                 return (EPERM);
 388         else
 389                 return (0);
 390 }
 391
 392 static int
 393 hpet_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
 394     int nprot, vm_memattr_t *memattr)
 395 {
 396         struct hpet_softc *sc;
 397
 398         sc = cdev->si_drv1;
 399         if (offset >= rman_get_size(sc->mem_res))
 400                 return (EINVAL);
 401         if (!sc->mmap_allow_write && (nprot & PROT_WRITE))
 402                 return (EPERM);
 403         *paddr = rman_get_start(sc->mem_res) + offset;
 404         *memattr = VM_MEMATTR_UNCACHEABLE;
 405
 406         return (0);
 407 }
 408
 409 /* Discover the HPET via the ACPI table of the same name. */
 410 static void
 411 hpet_identify(driver_t *driver, device_t parent)
 412 {
 413         ACPI_TABLE_HPET *hpet;
 414         ACPI_STATUS     status;
 415         device_t        child;
 416         int             i;
 417
 418         /* Only one HPET device can be added. */
 419         if (devclass_get_device(hpet_devclass, 0))
 420                 return;
 421         for (i = 1; ; i++) {
 422                 /* Search for HPET table. */
 423                 status = AcpiGetTable(ACPI_SIG_HPET, i, (ACPI_TABLE_HEADER **)&hpet);
 424                 if (ACPI_FAILURE(status))
 425                         return;
 426                 /* Search for HPET device with same ID. */
 427                 child = NULL;
 428                 AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 429                     100, hpet_find, NULL, (void *)(uintptr_t)hpet->Sequence,
 430                     (void *)&child);
 431                 /* If found - let it be probed in normal way. */
 432                 if (child) {
 433                         if (bus_get_resource(child, SYS_RES_MEMORY, 0,
 434                             NULL, NULL) != 0)
 435                                 bus_set_resource(child, SYS_RES_MEMORY, 0,
 436                                     hpet->Address.Address, HPET_MEM_WIDTH);
 437                         continue;
 438                 }
 439                 /* If not - create it from table info. */
 440                 child = BUS_ADD_CHILD(parent, 2, "hpet", 0);
 441                 if (child == NULL) {
 442                         printf("%s: can't add child\n", __func__);
 443                         continue;
 444                 }
 445                 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address,
 446                     HPET_MEM_WIDTH);
 447         }
 448 }
 449
 450 static int
 451 hpet_probe(device_t dev)
 452 {
 453         int rv;
 454
 455         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
 456         if (acpi_disabled("hpet") || acpi_hpet_disabled)
 457                 return (ENXIO);
 458         if (acpi_get_handle(dev) != NULL)
 459                 rv = ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids, NULL);
 460         else
 461                 rv = 0;
 462         if (rv <= 0)
 463                 device_set_desc(dev, "High Precision Event Timer");
 464         return (rv);
 465 }
 466
 467 static int
 468 hpet_attach(device_t dev)
 469 {
 470         struct hpet_softc *sc;
 471         struct hpet_timer *t;
 472         struct make_dev_args mda;
 473         int i, j, num_msi, num_timers, num_percpu_et, num_percpu_t, cur_cpu;
 474         int pcpu_master, error;
 475         static int maxhpetet = 0;
 476         uint32_t val, val2, cvectors, dvectors;
 477         uint16_t vendor, rev;
 478
 479         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
 480
 481         sc = device_get_softc(dev);
 482         sc->dev = dev;
 483         sc->handle = acpi_get_handle(dev);
 484
 485         sc->mem_rid = 0;
 486         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->mem_rid,
 487             RF_ACTIVE);
 488         if (sc->mem_res == NULL)
 489                 return (ENOMEM);
 490
 491         /* Validate that we can access the whole region. */
 492         if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) {
 493                 device_printf(dev, "memory region width %jd too small\n",
 494                     rman_get_size(sc->mem_res));
 495                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
 496                 return (ENXIO);
 497         }
 498
 499         /* Be sure timer is enabled. */
 500         hpet_enable(sc);
 501
 502         /* Read basic statistics about the timer. */
 503         val = bus_read_4(sc->mem_res, HPET_PERIOD);
 504         if (val == 0) {
 505                 device_printf(dev, "invalid period\n");
 506                 hpet_disable(sc);
 507                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
 508                 return (ENXIO);
 509         }
 510
 511         sc->freq = (1000000000000000LL + val / 2) / val;
 512         sc->caps = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
 513         vendor = (sc->caps & HPET_CAP_VENDOR_ID) >> 16;
 514         rev = sc->caps & HPET_CAP_REV_ID;
 515         num_timers = 1 + ((sc->caps & HPET_CAP_NUM_TIM) >> 8);
 516         /*
 517          * ATI/AMD violates IA-PC HPET (High Precision Event Timers)
 518          * Specification and provides an off by one number
 519          * of timers/comparators.
 520          * Additionally, they use unregistered value in VENDOR_ID field.
 521          */
 522         if (vendor == HPET_VENDID_AMD && rev < 0x10 && num_timers > 0)
 523                 num_timers--;
 524         sc->num_timers = num_timers;
 525         if (bootverbose) {
 526                 device_printf(dev,
 527                     "vendor 0x%x, rev 0x%x, %jdHz%s, %d timers,%s\n",
 528                     vendor, rev, sc->freq,
 529                     (sc->caps & HPET_CAP_COUNT_SIZE) ? " 64bit" : "",
 530                     num_timers,
 531                     (sc->caps & HPET_CAP_LEG_RT) ? " legacy route" : "");
 532         }
 533         for (i = 0; i < num_timers; i++) {
 534                 t = &sc->t[i];
 535                 t->sc = sc;
 536                 t->num = i;
 537                 t->mode = TIMER_STOPPED;
 538                 t->intr_rid = -1;
 539                 t->irq = -1;
 540                 t->pcpu_cpu = -1;
 541                 t->pcpu_misrouted = 0;
 542                 t->pcpu_master = -1;
 543                 t->caps = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i));
 544                 t->vectors = bus_read_4(sc->mem_res, HPET_TIMER_CAP_CNF(i) + 4);
 545                 if (bootverbose) {
 546                         device_printf(dev,
 547                             " t%d: irqs 0x%08x (%d)%s%s%s\n", i,
 548                             t->vectors, (t->caps & HPET_TCNF_INT_ROUTE) >> 9,
 549                             (t->caps & HPET_TCAP_FSB_INT_DEL) ? ", MSI" : "",
 550                             (t->caps & HPET_TCAP_SIZE) ? ", 64bit" : "",
 551                             (t->caps & HPET_TCAP_PER_INT) ? ", periodic" : "");
 552                 }
 553         }
 554         if (testenv("debug.acpi.hpet_test"))
 555                 hpet_test(sc);
 556         /*
 557          * Don't attach if the timer never increments.  Since the spec
 558          * requires it to be at least 10 MHz, it has to change in 1 us.
 559          */
 560         val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 561         DELAY(1);
 562         val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 563         if (val == val2) {
 564                 device_printf(dev, "HPET never increments, disabling\n");
 565                 hpet_disable(sc);
 566                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
 567                 return (ENXIO);
 568         }
 569         /* Announce first HPET as timecounter. */
 570         if (device_get_unit(dev) == 0) {
 571                 sc->tc.tc_get_timecount = hpet_get_timecount,
 572                 sc->tc.tc_counter_mask = ~0u,
 573                 sc->tc.tc_name = "HPET",
 574                 sc->tc.tc_quality = 950,
 575                 sc->tc.tc_frequency = sc->freq;
 576                 sc->tc.tc_priv = sc;
 577                 sc->tc.tc_fill_vdso_timehands = hpet_vdso_timehands;
 578 #ifdef COMPAT_FREEBSD32
 579                 sc->tc.tc_fill_vdso_timehands32 = hpet_vdso_timehands32;
 580 #endif
 581                 tc_init(&sc->tc);
 582         }
 583         /* If not disabled - setup and announce event timers. */
 584         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
 585              "clock", &i) == 0 && i == 0)
 586                 return (0);
 587
 588         /* Check whether we can and want legacy routing. */
 589         sc->legacy_route = 0;
 590         resource_int_value(device_get_name(dev), device_get_unit(dev),
 591              "legacy_route", &sc->legacy_route);
 592         if ((sc->caps & HPET_CAP_LEG_RT) == 0)
 593                 sc->legacy_route = 0;
 594         if (sc->legacy_route) {
 595                 sc->t[0].vectors = 0;
 596                 sc->t[1].vectors = 0;
 597         }
 598
 599         /* Check what IRQs we want use. */
 600         /* By default allow any PCI IRQs. */
 601         sc->allowed_irqs = 0xffff0000;
 602         /*
 603          * HPETs in AMD chipsets before SB800 have problems with IRQs >= 16
 604          * Lower are also not always working for different reasons.
 605          * SB800 fixed it, but seems do not implements level triggering
 606          * properly, that makes it very unreliable - it freezes after any
 607          * interrupt loss. Avoid legacy IRQs for AMD.
 608          */
 609         if (vendor == HPET_VENDID_AMD || vendor == HPET_VENDID_AMD2)
 610                 sc->allowed_irqs = 0x00000000;
 611         /*
 612          * NVidia MCP5x chipsets have number of unexplained interrupt
 613          * problems. For some reason, using HPET interrupts breaks HDA sound.
 614          */
 615         if (vendor == HPET_VENDID_NVIDIA && rev <= 0x01)
 616                 sc->allowed_irqs = 0x00000000;
 617         /*
 618          * ServerWorks HT1000 reported to have problems with IRQs >= 16.
 619          * Lower IRQs are working, but allowed mask is not set correctly.
 620          * Legacy_route mode works fine.
 621          */
 622         if (vendor == HPET_VENDID_SW && rev <= 0x01)
 623                 sc->allowed_irqs = 0x00000000;
 624         /*
 625          * Neither QEMU nor VirtualBox report supported IRQs correctly.
 626          * The only way to use HPET there is to specify IRQs manually
 627          * and/or use legacy_route. Legacy_route mode works on both.
 628          */
 629         if (vm_guest)
 630                 sc->allowed_irqs = 0x00000000;
 631         /* Let user override. */
 632         resource_int_value(device_get_name(dev), device_get_unit(dev),
 633              "allowed_irqs", &sc->allowed_irqs);
 634
 635         /* Get how much per-CPU timers we should try to provide. */
 636         sc->per_cpu = 1;
 637         resource_int_value(device_get_name(dev), device_get_unit(dev),
 638              "per_cpu", &sc->per_cpu);
 639
 640         num_msi = 0;
 641         sc->useirq = 0;
 642         /* Find IRQ vectors for all timers. */
 643         cvectors = sc->allowed_irqs & 0xffff0000;
 644         dvectors = sc->allowed_irqs & 0x0000ffff;
 645         if (sc->legacy_route)
 646                 dvectors &= 0x0000fefe;
 647         for (i = 0; i < num_timers; i++) {
 648                 t = &sc->t[i];
 649                 if (sc->legacy_route && i < 2)
 650                         t->irq = (i == 0) ? 0 : 8;
 651 #ifdef DEV_APIC
 652                 else if (t->caps & HPET_TCAP_FSB_INT_DEL) {
 653                         if ((j = PCIB_ALLOC_MSIX(
 654                             device_get_parent(device_get_parent(dev)), dev,
 655                             &t->irq))) {
 656                                 device_printf(dev,
 657                                     "Can't allocate interrupt for t%d: %d\n",
 658                                     i, j);
 659                         }
 660                 }
 661 #endif
 662                 else if (dvectors & t->vectors) {
 663                         t->irq = ffs(dvectors & t->vectors) - 1;
 664                         dvectors &= ~(1 << t->irq);
 665                 }
 666                 if (t->irq >= 0) {
 667                         t->intr_rid = hpet_find_irq_rid(dev, t->irq, t->irq);
 668                         t->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
 669                             &t->intr_rid, t->irq, t->irq, 1, RF_ACTIVE);
 670                         if (t->intr_res == NULL) {
 671                                 t->irq = -1;
 672                                 device_printf(dev,
 673                                     "Can't map interrupt for t%d.\n", i);
 674                         } else if (bus_setup_intr(dev, t->intr_res,
 675                             INTR_TYPE_CLK, hpet_intr_single, NULL, t,
 676                             &t->intr_handle) != 0) {
 677                                 t->irq = -1;
 678                                 device_printf(dev,
 679                                     "Can't setup interrupt for t%d.\n", i);
 680                         } else {
 681                                 bus_describe_intr(dev, t->intr_res,
 682                                     t->intr_handle, "t%d", i);
 683                                 num_msi++;
 684                         }
 685                 }
 686                 if (t->irq < 0 && (cvectors & t->vectors) != 0) {
 687                         cvectors &= t->vectors;
 688                         sc->useirq |= (1 << i);
 689                 }
 690         }
 691         if (sc->legacy_route && sc->t[0].irq < 0 && sc->t[1].irq < 0)
 692                 sc->legacy_route = 0;
 693         if (sc->legacy_route)
 694                 hpet_enable(sc);
 695         /* Group timers for per-CPU operation. */
 696         num_percpu_et = min(num_msi / mp_ncpus, sc->per_cpu);
 697         num_percpu_t = num_percpu_et * mp_ncpus;
 698         pcpu_master = 0;
 699         cur_cpu = CPU_FIRST();
 700         for (i = 0; i < num_timers; i++) {
 701                 t = &sc->t[i];
 702                 if (t->irq >= 0 && num_percpu_t > 0) {
 703                         if (cur_cpu == CPU_FIRST())
 704                                 pcpu_master = i;
 705                         t->pcpu_cpu = cur_cpu;
 706                         t->pcpu_master = pcpu_master;
 707                         sc->t[pcpu_master].
 708                             pcpu_slaves[cur_cpu] = i;
 709                         bus_bind_intr(dev, t->intr_res, cur_cpu);
 710                         cur_cpu = CPU_NEXT(cur_cpu);
 711                         num_percpu_t--;
 712                 } else if (t->irq >= 0)
 713                         bus_bind_intr(dev, t->intr_res, CPU_FIRST());
 714         }
 715         bus_write_4(sc->mem_res, HPET_ISR, 0xffffffff);
 716         sc->irq = -1;
 717         /* If at least one timer needs legacy IRQ - set it up. */
 718         if (sc->useirq) {
 719                 j = i = fls(cvectors) - 1;
 720                 while (j > 0 && (cvectors & (1 << (j - 1))) != 0)
 721                         j--;
 722                 sc->intr_rid = hpet_find_irq_rid(dev, j, i);
 723                 sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
 724                     &sc->intr_rid, j, i, 1, RF_SHAREABLE | RF_ACTIVE);
 725                 if (sc->intr_res == NULL)
 726                         device_printf(dev, "Can't map interrupt.\n");
 727                 else if (bus_setup_intr(dev, sc->intr_res, INTR_TYPE_CLK,
 728                     hpet_intr, NULL, sc, &sc->intr_handle) != 0) {
 729                         device_printf(dev, "Can't setup interrupt.\n");
 730                 } else {
 731                         sc->irq = rman_get_start(sc->intr_res);
 732                         /* Bind IRQ to BSP to avoid live migration. */
 733                         bus_bind_intr(dev, sc->intr_res, CPU_FIRST());
 734                 }
 735         }
 736         /* Program and announce event timers. */
 737         for (i = 0; i < num_timers; i++) {
 738                 t = &sc->t[i];
 739                 t->caps &= ~(HPET_TCNF_FSB_EN | HPET_TCNF_INT_ROUTE);
 740                 t->caps &= ~(HPET_TCNF_VAL_SET | HPET_TCNF_INT_ENB);
 741                 t->caps &= ~(HPET_TCNF_INT_TYPE);
 742                 t->caps |= HPET_TCNF_32MODE;
 743                 if (t->irq >= 0 && sc->legacy_route && i < 2) {
 744                         /* Legacy route doesn't need more configuration. */
 745                 } else
 746 #ifdef DEV_APIC
 747                 if ((t->caps & HPET_TCAP_FSB_INT_DEL) && t->irq >= 0) {
 748                         uint64_t addr;
 749                         uint32_t data;
 750
 751                         if (PCIB_MAP_MSI(
 752                             device_get_parent(device_get_parent(dev)), dev,
 753                             t->irq, &addr, &data) == 0) {
 754                                 bus_write_4(sc->mem_res,
 755                                     HPET_TIMER_FSB_ADDR(i), addr);
 756                                 bus_write_4(sc->mem_res,
 757                                     HPET_TIMER_FSB_VAL(i), data);
 758                                 t->caps |= HPET_TCNF_FSB_EN;
 759                         } else
 760                                 t->irq = -2;
 761                 } else
 762 #endif
 763                 if (t->irq >= 0)
 764                         t->caps |= (t->irq << 9);
 765                 else if (sc->irq >= 0 && (t->vectors & (1 << sc->irq)))
 766                         t->caps |= (sc->irq << 9) | HPET_TCNF_INT_TYPE;
 767                 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(i), t->caps);
 768                 /* Skip event timers without set up IRQ. */
 769                 if (t->irq < 0 &&
 770                     (sc->irq < 0 || (t->vectors & (1 << sc->irq)) == 0))
 771                         continue;
 772                 /* Announce the reset. */
 773                 if (maxhpetet == 0)
 774                         t->et.et_name = "HPET";
 775                 else {
 776                         sprintf(t->name, "HPET%d", maxhpetet);
 777                         t->et.et_name = t->name;
 778                 }
 779                 t->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;
 780                 t->et.et_quality = 450;
 781                 if (t->pcpu_master >= 0) {
 782                         t->et.et_flags |= ET_FLAGS_PERCPU;
 783                         t->et.et_quality += 100;
 784                 } else if (mp_ncpus >= 8)
 785                         t->et.et_quality -= 100;
 786                 if ((t->caps & HPET_TCAP_PER_INT) == 0)
 787                         t->et.et_quality -= 10;
 788                 t->et.et_frequency = sc->freq;
 789                 t->et.et_min_period =
 790                     ((uint64_t)(HPET_MIN_CYCLES * 2) << 32) / sc->freq;
 791                 t->et.et_max_period = (0xfffffffeLLU << 32) / sc->freq;
 792                 t->et.et_start = hpet_start;
 793                 t->et.et_stop = hpet_stop;
 794                 t->et.et_priv = &sc->t[i];
 795                 if (t->pcpu_master < 0 || t->pcpu_master == i) {
 796                         et_register(&t->et);
 797                         maxhpetet++;
 798                 }
 799         }
 800         acpi_GetInteger(sc->handle, "_UID", &sc->acpi_uid);
 801
 802         make_dev_args_init(&mda);
 803         mda.mda_devsw = &hpet_cdevsw;
 804         mda.mda_uid = UID_ROOT;
 805         mda.mda_gid = GID_WHEEL;
 806         mda.mda_mode = 0644;
 807         mda.mda_si_drv1 = sc;
 808         error = make_dev_s(&mda, &sc->pdev, "hpet%d", device_get_unit(dev));
 809         if (error == 0) {
 810                 sc->mmap_allow = 1;
 811                 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow",
 812                     &sc->mmap_allow);
 813                 sc->mmap_allow_write = 0;
 814                 TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow_write",
 815                     &sc->mmap_allow_write);
 816                 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
 817                     SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
 818                     OID_AUTO, "mmap_allow",
 819                     CTLFLAG_RW, &sc->mmap_allow, 0,
 820                     "Allow userland to memory map HPET");
 821                 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
 822                     SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
 823                     OID_AUTO, "mmap_allow_write",
 824                     CTLFLAG_RW, &sc->mmap_allow_write, 0,
 825                     "Allow userland write to the HPET register space");
 826         } else {
 827                 device_printf(dev, "could not create /dev/hpet%d, error %d\n",
 828                     device_get_unit(dev), error);
 829         }
 830
 831         return (0);
 832 }
 833
 834 static int
 835 hpet_detach(device_t dev)
 836 {
 837         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
 838
 839         /* XXX Without a tc_remove() function, we can't detach. */
 840         return (EBUSY);
 841 }
 842
 843 static int
 844 hpet_suspend(device_t dev)
 845 {
 846 //      struct hpet_softc *sc;
 847
 848         /*
 849          * Disable the timer during suspend.  The timer will not lose
 850          * its state in S1 or S2, but we are required to disable
 851          * it.
 852          */
 853 //      sc = device_get_softc(dev);
 854 //      hpet_disable(sc);
 855
 856         return (0);
 857 }
 858
 859 static int
 860 hpet_resume(device_t dev)
 861 {
 862         struct hpet_softc *sc;
 863         struct hpet_timer *t;
 864         int i;
 865
 866         /* Re-enable the timer after a resume to keep the clock advancing. */
 867         sc = device_get_softc(dev);
 868         hpet_enable(sc);
 869         /* Restart event timers that were running on suspend. */
 870         for (i = 0; i < sc->num_timers; i++) {
 871                 t = &sc->t[i];
 872 #ifdef DEV_APIC
 873                 if (t->irq >= 0 && (sc->legacy_route == 0 || i >= 2)) {
 874                         uint64_t addr;
 875                         uint32_t data;
 876
 877                         if (PCIB_MAP_MSI(
 878                             device_get_parent(device_get_parent(dev)), dev,
 879                             t->irq, &addr, &data) == 0) {
 880                                 bus_write_4(sc->mem_res,
 881                                     HPET_TIMER_FSB_ADDR(i), addr);
 882                                 bus_write_4(sc->mem_res,
 883                                     HPET_TIMER_FSB_VAL(i), data);
 884                         }
 885                 }
 886 #endif
 887                 if (t->mode == TIMER_STOPPED)
 888                         continue;
 889                 t->next = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 890                 if (t->mode == TIMER_PERIODIC &&
 891                     (t->caps & HPET_TCAP_PER_INT) != 0) {
 892                         t->caps |= HPET_TCNF_TYPE;
 893                         t->next += t->div;
 894                         bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num),
 895                             t->caps | HPET_TCNF_VAL_SET);
 896                         bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 897                             t->next);
 898                         bus_read_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num));
 899                         bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 900                             t->div);
 901                 } else {
 902                         t->next += sc->freq / 1024;
 903                         bus_write_4(sc->mem_res, HPET_TIMER_COMPARATOR(t->num),
 904                             t->next);
 905                 }
 906                 bus_write_4(sc->mem_res, HPET_ISR, 1 << t->num);
 907                 bus_write_4(sc->mem_res, HPET_TIMER_CAP_CNF(t->num), t->caps);
 908         }
 909         return (0);
 910 }
 911
 912 /* Print some basic latency/rate information to assist in debugging. */
 913 static void
 914 hpet_test(struct hpet_softc *sc)
 915 {
 916         int i;
 917         uint32_t u1, u2;
 918         struct bintime b0, b1, b2;
 919         struct timespec ts;
 920
 921         binuptime(&b0);
 922         binuptime(&b0);
 923         binuptime(&b1);
 924         u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 925         for (i = 1; i < 1000; i++)
 926                 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 927         binuptime(&b2);
 928         u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 929
 930         bintime_sub(&b2, &b1);
 931         bintime_sub(&b1, &b0);
 932         bintime_sub(&b2, &b1);
 933         bintime2timespec(&b2, &ts);
 934
 935         device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
 936             (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1);
 937
 938         device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
 939 }
 940
 941 #ifdef DEV_APIC
 942 static int
 943 hpet_remap_intr(device_t dev, device_t child, u_int irq)
 944 {
 945         struct hpet_softc *sc = device_get_softc(dev);
 946         struct hpet_timer *t;
 947         uint64_t addr;
 948         uint32_t data;
 949         int error, i;
 950
 951         for (i = 0; i < sc->num_timers; i++) {
 952                 t = &sc->t[i];
 953                 if (t->irq != irq)
 954                         continue;
 955                 error = PCIB_MAP_MSI(
 956                     device_get_parent(device_get_parent(dev)), dev,
 957                     irq, &addr, &data);
 958                 if (error)
 959                         return (error);
 960                 hpet_disable(sc); /* Stop timer to avoid interrupt loss. */
 961                 bus_write_4(sc->mem_res, HPET_TIMER_FSB_ADDR(i), addr);
 962                 bus_write_4(sc->mem_res, HPET_TIMER_FSB_VAL(i), data);
 963                 hpet_enable(sc);
 964                 return (0);
 965         }
 966         return (ENOENT);
 967 }
 968 #endif
 969
 970 static device_method_t hpet_methods[] = {
 971         /* Device interface */
 972         DEVMETHOD(device_identify, hpet_identify),
 973         DEVMETHOD(device_probe, hpet_probe),
 974         DEVMETHOD(device_attach, hpet_attach),
 975         DEVMETHOD(device_detach, hpet_detach),
 976         DEVMETHOD(device_suspend, hpet_suspend),
 977         DEVMETHOD(device_resume, hpet_resume),
 978
 979 #ifdef DEV_APIC
 980         DEVMETHOD(bus_remap_intr, hpet_remap_intr),
 981 #endif
 982
 983         DEVMETHOD_END
 984 };
 985
 986 static driver_t hpet_driver = {
 987         "hpet",
 988         hpet_methods,
 989         sizeof(struct hpet_softc),
 990 };
 991
 992 DRIVER_MODULE(hpet, acpi, hpet_driver, hpet_devclass, 0, 0);
 993 MODULE_DEPEND(hpet, acpi, 1, 1, 1);