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Annotation of sys/dev/acpi/acpitimer.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: acpitimer.c,v 1.6 2007/02/22 07:01:41 jordan Exp $    */
                      2: /*
                      3:  * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  */
                     17:
                     18: #include <sys/param.h>
                     19: #include <sys/systm.h>
                     20: #include <sys/device.h>
                     21: #include <sys/malloc.h>
                     22: #ifdef __HAVE_TIMECOUNTER
                     23: #include <sys/timetc.h>
                     24: #endif
                     25:
                     26: #include <machine/bus.h>
                     27:
                     28: #include <dev/acpi/acpireg.h>
                     29: #include <dev/acpi/acpivar.h>
                     30:
                     31: int acpitimermatch(struct device *, void *, void *);
                     32: void acpitimerattach(struct device *, struct device *, void *);
                     33:
                     34: #ifdef __HAVE_TIMECOUNTER
                     35: u_int acpi_get_timecount(struct timecounter *tc);
                     36:
                     37: static struct timecounter acpi_timecounter = {
                     38:        acpi_get_timecount,     /* get_timecount */
                     39:        0,                      /* no poll_pps */
                     40:        0x00ffffff,             /* counter_mask (24 bits) */
                     41:        ACPI_FREQUENCY,         /* frequency */
                     42:        0,                      /* name */
                     43:        1000                    /* quality */
                     44: };
                     45: #endif
                     46:
                     47: struct acpitimer_softc {
                     48:        struct device           sc_dev;
                     49:
                     50:        bus_space_tag_t         sc_iot;
                     51:        bus_space_handle_t      sc_ioh;
                     52: };
                     53:
                     54: struct cfattach acpitimer_ca = {
                     55:        sizeof(struct acpitimer_softc), acpitimermatch, acpitimerattach
                     56: };
                     57:
                     58: struct cfdriver acpitimer_cd = {
                     59:        NULL, "acpitimer", DV_DULL
                     60: };
                     61:
                     62: int
                     63: acpitimermatch(struct device *parent, void *match, void *aux)
                     64: {
                     65:        struct acpi_attach_args *aa = aux;
                     66:        struct cfdata *cf = match;
                     67:
                     68:        /* sanity */
                     69:        if (aa->aaa_name == NULL ||
                     70:            strcmp(aa->aaa_name, cf->cf_driver->cd_name) != 0 ||
                     71:            aa->aaa_table != NULL)
                     72:                return (0);
                     73:
                     74:        return (1);
                     75: }
                     76:
                     77: void
                     78: acpitimerattach(struct device *parent, struct device *self, void *aux)
                     79: {
                     80:        struct acpitimer_softc *sc = (struct acpitimer_softc *) self;
                     81:        struct acpi_softc *psc = (struct acpi_softc *) parent;
                     82:        int rc;
                     83:
                     84:        if (psc->sc_fadt->hdr_revision >= 3)
                     85:                rc = acpi_map_address(psc, &psc->sc_fadt->x_pm_tmr_blk, 0,
                     86:                    psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot);
                     87:        else
                     88:                rc = acpi_map_address(psc, NULL, psc->sc_fadt->pm_tmr_blk,
                     89:                    psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot);
                     90:        if (rc) {
                     91:                printf(": can't map i/o space\n");
                     92:                return;
                     93:        }
                     94:
                     95:        printf(": %ld Hz, %d bits\n", ACPI_FREQUENCY,
                     96:            psc->sc_fadt->flags & FADT_TMR_VAL_EXT ? 32 : 24);
                     97:
                     98: #ifdef __HAVE_TIMECOUNTER
                     99:        if (psc->sc_fadt->flags & FADT_TMR_VAL_EXT)
                    100:                acpi_timecounter.tc_counter_mask = 0xffffffffU;
                    101:        acpi_timecounter.tc_priv = sc;
                    102:        acpi_timecounter.tc_name = sc->sc_dev.dv_xname;
                    103:        tc_init(&acpi_timecounter);
                    104: #endif
                    105: }
                    106:
                    107:
                    108: #ifdef __HAVE_TIMECOUNTER
                    109: u_int
                    110: acpi_get_timecount(struct timecounter *tc)
                    111: {
                    112:        struct acpitimer_softc *sc = tc->tc_priv;
                    113:        u_int u1, u2, u3;
                    114:
                    115:        u2 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0);
                    116:        u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0);
                    117:        do {
                    118:                u1 = u2;
                    119:                u2 = u3;
                    120:                u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0);
                    121:        } while (u1 > u2 || u2 > u3);
                    122:
                    123:        return (u2);
                    124: }
                    125: #endif