The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_hpet.c

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    1 /*-
    2  * Copyright (c) 2005 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/dev/acpica/acpi_hpet.c,v 1.12.2.1.2.1 2008/11/25 02:59:29 kensmith Exp $
   27  */
   28 
   29 #include "opt_acpi.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/systimer.h>
   36 #include <sys/rman.h>
   37 
   38 #include "acpi.h"
   39 #include "accommon.h"
   40 #include "acpivar.h"
   41 #include "acpi_hpet.h"
   42 
   43 /* Hooks for the ACPI CA debugging infrastructure */
   44 #define _COMPONENT      ACPI_TIMER
   45 ACPI_MODULE_NAME("HPET")
   46 
   47 static bus_space_handle_t       acpi_hpet_bsh;
   48 static bus_space_tag_t          acpi_hpet_bst;
   49 static u_long                   acpi_hpet_res_start;
   50 
   51 struct acpi_hpet_softc {
   52         device_t                dev;
   53         struct resource         *mem_res;
   54         ACPI_HANDLE             handle;
   55 };
   56 
   57 #define DEV_HPET(x)     (acpi_get_magic(x) == (uintptr_t)&acpi_hpet_devclass)
   58 
   59 static sysclock_t       acpi_hpet_get_timecount(void);
   60 static void             acpi_hpet_construct(struct cputimer *, sysclock_t);
   61 
   62 static int              acpi_hpet_identify(driver_t *, device_t);
   63 static int              acpi_hpet_probe(device_t);
   64 static int              acpi_hpet_attach(device_t);
   65 static int              acpi_hpet_resume(device_t);
   66 static int              acpi_hpet_suspend(device_t);
   67 
   68 static void             acpi_hpet_test(struct acpi_hpet_softc *sc);
   69 static u_int            acpi_hpet_read(void);
   70 static void             acpi_hpet_enable(struct acpi_hpet_softc *);
   71 static void             acpi_hpet_disable(struct acpi_hpet_softc *);
   72 
   73 static char *hpet_ids[] = { "PNP0103", NULL };
   74 
   75 static struct cputimer acpi_hpet_timer = {
   76         SLIST_ENTRY_INITIALIZER,
   77         "HPET",
   78         CPUTIMER_PRI_HPET,
   79         CPUTIMER_HPET,
   80         acpi_hpet_get_timecount,
   81         cputimer_default_fromhz,
   82         cputimer_default_fromus,
   83         acpi_hpet_construct,
   84         cputimer_default_destruct,
   85         0,
   86         0, 0, 0
   87 };
   88 
   89 static device_method_t acpi_hpet_methods[] = {
   90         DEVMETHOD(device_identify,      acpi_hpet_identify),
   91         DEVMETHOD(device_probe,         acpi_hpet_probe),
   92         DEVMETHOD(device_attach,        acpi_hpet_attach),
   93         DEVMETHOD(device_suspend,       acpi_hpet_suspend),
   94         DEVMETHOD(device_resume,        acpi_hpet_resume),
   95         DEVMETHOD_END
   96 };
   97 
   98 static driver_t acpi_hpet_driver = {
   99         "acpi_hpet",
  100         acpi_hpet_methods,
  101         sizeof(struct acpi_hpet_softc),
  102 };
  103 
  104 static devclass_t acpi_hpet_devclass;
  105 DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, NULL, NULL);
  106 MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);
  107 
  108 static u_int
  109 acpi_hpet_read(void)
  110 {
  111         return bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh,
  112                                 HPET_MAIN_COUNTER);
  113 }
  114 
  115 /*
  116  * Locate the ACPI timer using the FADT, set up and allocate the I/O resources
  117  * we will be using.
  118  */
  119 static int
  120 acpi_hpet_identify(driver_t *driver, device_t parent)
  121 {
  122         ACPI_TABLE_HPET *hpet;
  123         ACPI_TABLE_HEADER *hdr;
  124         ACPI_STATUS status;
  125         device_t child;
  126 
  127         /*
  128          * Just try once, do nothing if the 'acpi' bus is rescanned.
  129          */
  130         if (device_get_state(parent) == DS_ATTACHED)
  131                 return 0;
  132 
  133         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
  134 
  135         /* Only one HPET device can be added. */
  136         if (devclass_get_device(acpi_hpet_devclass, 0))
  137                 return ENXIO;
  138 
  139         /* Currently, ID and minimum clock tick info is unused. */
  140 
  141         status = AcpiGetTable(ACPI_SIG_HPET, 1, &hdr);
  142         if (ACPI_FAILURE(status))
  143                 return ENXIO;
  144 
  145         /*
  146          * The unit number could be derived from hdr->Sequence but we only
  147          * support one HPET device.
  148          */
  149         hpet = (ACPI_TABLE_HPET *)hdr;
  150         if (hpet->Sequence != 0) {
  151                 kprintf("ACPI HPET table warning: Sequence is non-zero (%d)\n",
  152                         hpet->Sequence);
  153         }
  154 
  155         child = BUS_ADD_CHILD(parent, parent, 0, "acpi_hpet", 0);
  156         if (child == NULL) {
  157                 device_printf(parent, "%s: can't add acpi_hpet0\n", __func__);
  158                 return ENXIO;
  159         }
  160 
  161         /* Record a magic value so we can detect this device later. */
  162         acpi_set_magic(child, (uintptr_t)&acpi_hpet_devclass);
  163 
  164         acpi_hpet_res_start = hpet->Address.Address;
  165         if (bus_set_resource(child, SYS_RES_MEMORY, 0,
  166                              hpet->Address.Address, HPET_MEM_WIDTH, -1)) {
  167                 device_printf(child, "could not set iomem resources: "
  168                               "0x%jx, %d\n", (uintmax_t)hpet->Address.Address,
  169                               HPET_MEM_WIDTH);
  170                 return ENOMEM;
  171         }
  172         return 0;
  173 }
  174 
  175 static int
  176 acpi_hpet_probe(device_t dev)
  177 {
  178         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
  179 
  180         if (acpi_disabled("hpet"))
  181                 return ENXIO;
  182 
  183         if (!DEV_HPET(dev) &&
  184             (ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL ||
  185              device_get_unit(dev) != 0))
  186                 return ENXIO;
  187 
  188         device_set_desc(dev, "High Precision Event Timer");
  189         return 0;
  190 }
  191 
  192 static int
  193 acpi_hpet_attach(device_t dev)
  194 {
  195         struct acpi_hpet_softc *sc;
  196         int rid;
  197         uint32_t val, val2;
  198         uintmax_t freq;
  199 
  200         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
  201 
  202         sc = device_get_softc(dev);
  203         sc->dev = dev;
  204         sc->handle = acpi_get_handle(dev);
  205 
  206         rid = 0;
  207         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  208                                              RF_ACTIVE);
  209         if (sc->mem_res == NULL) {
  210                 /*
  211                  * We only need to make sure that main counter
  212                  * is accessable.
  213                  */
  214                 device_printf(dev, "can't map %dB register space, try %dB\n",
  215                               HPET_MEM_WIDTH, HPET_MEM_WIDTH_MIN);
  216                 rid = 0;
  217                 sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
  218                                 acpi_hpet_res_start,
  219                                 acpi_hpet_res_start + HPET_MEM_WIDTH_MIN - 1,
  220                                 HPET_MEM_WIDTH_MIN, RF_ACTIVE);
  221                 if (sc->mem_res == NULL)
  222                         return ENOMEM;
  223         }
  224 
  225         /* Validate that we can access the whole region. */
  226         if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH_MIN) {
  227                 device_printf(dev, "memory region width %ld too small\n",
  228                               rman_get_size(sc->mem_res));
  229                 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->mem_res);
  230                 return ENXIO;
  231         }
  232 
  233         acpi_hpet_bsh = rman_get_bushandle(sc->mem_res);
  234         acpi_hpet_bst = rman_get_bustag(sc->mem_res);
  235 
  236         /* Be sure timer is enabled. */
  237         acpi_hpet_enable(sc);
  238 
  239         /* Read basic statistics about the timer. */
  240         val = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_PERIOD);
  241         if (val == 0) {
  242                 device_printf(dev, "invalid period\n");
  243                 acpi_hpet_disable(sc);
  244                 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->mem_res);
  245                 return ENXIO;
  246         }
  247 
  248         freq = (1000000000000000LL + val / 2) / val;
  249         if (bootverbose) {
  250                 val = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh,
  251                                        HPET_CAPABILITIES);
  252                 device_printf(dev,
  253                     "vend: 0x%x, rev: 0x%x, num: %d, opts:%s%s\n",
  254                     val >> 16, val & HPET_CAP_REV_ID,
  255                     (val & HPET_CAP_NUM_TIM) >> 8,
  256                     (val & HPET_CAP_LEG_RT) ? " legacy_route" : "",
  257                     (val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : "");
  258         }
  259 
  260         if (ktestenv("debug.acpi.hpet_test"))
  261                 acpi_hpet_test(sc);
  262 
  263         /*
  264          * Don't attach if the timer never increments.  Since the spec
  265          * requires it to be at least 10 MHz, it has to change in 1 us.
  266          */
  267         val = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh,
  268                                HPET_MAIN_COUNTER);
  269         DELAY(1);
  270         val2 = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh,
  271                                 HPET_MAIN_COUNTER);
  272         if (val == val2) {
  273                 device_printf(dev, "HPET never increments, disabling\n");
  274                 acpi_hpet_disable(sc);
  275                 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->mem_res);
  276                 return ENXIO;
  277         }
  278 
  279         acpi_hpet_timer.freq = freq;
  280         device_printf(dev, "frequency %u\n", acpi_hpet_timer.freq);
  281 
  282         cputimer_register(&acpi_hpet_timer);
  283         cputimer_select(&acpi_hpet_timer, 0);
  284 
  285         return 0;
  286 }
  287 
  288 /*
  289  * Construct the timer.  Adjust the base so the system clock does not
  290  * jump weirdly.
  291  */
  292 static void
  293 acpi_hpet_construct(struct cputimer *timer, sysclock_t oldclock)
  294 {
  295         timer->base = 0;
  296         timer->base = oldclock - acpi_hpet_get_timecount();
  297 }
  298 
  299 static sysclock_t
  300 acpi_hpet_get_timecount(void)
  301 {
  302         return acpi_hpet_read() + acpi_hpet_timer.base;  
  303 }
  304 
  305 static void
  306 acpi_hpet_enable(struct acpi_hpet_softc *sc)
  307 {
  308         uint32_t val;
  309 
  310         val = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_CONFIG);
  311         bus_space_write_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_CONFIG,
  312                           val | HPET_CNF_ENABLE);
  313 }
  314 
  315 static void
  316 acpi_hpet_disable(struct acpi_hpet_softc *sc)
  317 {
  318         uint32_t val;
  319 
  320         val = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_CONFIG);
  321         bus_space_write_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_CONFIG,
  322                           val & ~HPET_CNF_ENABLE);
  323 }
  324 
  325 static int
  326 acpi_hpet_suspend(device_t dev)
  327 {
  328         /*
  329          * According to IA-PC HPET specification rev 1.0a
  330          *
  331          * Page 10, 2.3.3:
  332          * "1. The Event Timer registers (including the main counter)
  333          *  are not expected to be preserved through an S3, S4, or S5
  334          *  state."
  335          *
  336          * Page 11, 2.3.3:
  337          * "3. The main counter is permitted, but not required, to run
  338          *  during S1 or S2 states. ..."
  339          *
  340          * These mean we are not allowed to enter any of Sx states,
  341          * if HPET is used as the sys_cputimer.
  342          */
  343         if (sys_cputimer != &acpi_hpet_timer) {
  344                 struct acpi_hpet_softc *sc;
  345 
  346                 sc = device_get_softc(dev);
  347                 acpi_hpet_disable(sc);
  348 
  349                 return 0;
  350         } else {
  351                 return EOPNOTSUPP;
  352         }
  353 }
  354 
  355 static int
  356 acpi_hpet_resume(device_t dev)
  357 {
  358         if (sys_cputimer != &acpi_hpet_timer) {
  359                 struct acpi_hpet_softc *sc;
  360 
  361                 sc = device_get_softc(dev);
  362                 acpi_hpet_enable(sc);
  363         }
  364         return 0;
  365 }
  366  
  367 /* Print some basic latency/rate information to assist in debugging. */
  368 static void
  369 acpi_hpet_test(struct acpi_hpet_softc *sc)
  370 {
  371         int i;
  372         uint32_t u1, u2;
  373         struct timeval b0, b1, b2;
  374         struct timespec ts;
  375 
  376         microuptime(&b0);
  377         microuptime(&b0);
  378         microuptime(&b1);
  379         u1 = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_MAIN_COUNTER);
  380         for (i = 1; i < 1000; i++) {
  381                 u2 = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh,
  382                                       HPET_MAIN_COUNTER);
  383         }
  384         microuptime(&b2);
  385         u2 = bus_space_read_4(acpi_hpet_bst, acpi_hpet_bsh, HPET_MAIN_COUNTER);
  386 
  387         timevalsub(&b2, &b1);
  388         timevalsub(&b1, &b0);
  389         timevalsub(&b2, &b1);
  390 
  391         TIMEVAL_TO_TIMESPEC(&b2, &ts);
  392 
  393         device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
  394             (long)b2.tv_sec, b2.tv_usec, u1, u2, u2 - u1);
  395 
  396         device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
  397 }

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