/* $OpenBSD: acpitimer.c,v 1.8 2008/06/11 04:42:09 marco Exp $ */ /* * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/device.h> #include <sys/malloc.h> #ifdef __HAVE_TIMECOUNTER #include <sys/timetc.h> #endif #include <machine/bus.h> #include <dev/acpi/acpireg.h> #include <dev/acpi/acpivar.h> int acpitimermatch(struct device *, void *, void *); void acpitimerattach(struct device *, struct device *, void *); #ifdef __HAVE_TIMECOUNTER u_int acpi_get_timecount(struct timecounter *tc); static struct timecounter acpi_timecounter = { acpi_get_timecount, /* get_timecount */ 0, /* no poll_pps */ 0x00ffffff, /* counter_mask (24 bits) */ ACPI_FREQUENCY, /* frequency */ 0, /* name */ 1000 /* quality */ }; #endif struct acpitimer_softc { struct device sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; }; struct cfattach acpitimer_ca = { sizeof(struct acpitimer_softc), acpitimermatch, acpitimerattach }; struct cfdriver acpitimer_cd = { NULL, "acpitimer", DV_DULL }; int acpitimermatch(struct device *parent, void *match, void *aux) { struct acpi_attach_args *aa = aux; struct cfdata *cf = match; /* sanity */ if (aa->aaa_name == NULL || strcmp(aa->aaa_name, cf->cf_driver->cd_name) != 0 || aa->aaa_table != NULL) return (0); return (1); } void acpitimerattach(struct device *parent, struct device *self, void *aux) { struct acpitimer_softc *sc = (struct acpitimer_softc *) self; struct acpi_softc *psc = (struct acpi_softc *) parent; int rc; if (psc->sc_fadt->hdr_revision >= 3 && psc->sc_fadt->x_pm_tmr_blk.address != 0) rc = acpi_map_address(psc, &psc->sc_fadt->x_pm_tmr_blk, 0, psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot); else rc = acpi_map_address(psc, NULL, psc->sc_fadt->pm_tmr_blk, psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot); if (rc) { printf(": can't map i/o space\n"); return; } printf(": %ld Hz, %d bits\n", ACPI_FREQUENCY, psc->sc_fadt->flags & FADT_TMR_VAL_EXT ? 32 : 24); #ifdef __HAVE_TIMECOUNTER if (psc->sc_fadt->flags & FADT_TMR_VAL_EXT) acpi_timecounter.tc_counter_mask = 0xffffffffU; acpi_timecounter.tc_priv = sc; acpi_timecounter.tc_name = sc->sc_dev.dv_xname; tc_init(&acpi_timecounter); #endif } #ifdef __HAVE_TIMECOUNTER u_int acpi_get_timecount(struct timecounter *tc) { struct acpitimer_softc *sc = tc->tc_priv; u_int u1, u2, u3; u2 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); do { u1 = u2; u2 = u3; u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); } while (u1 > u2 || u2 > u3); return (u2); } #endif