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/* $OpenBSD: acpitimer.c,v 1.12 2017/10/06 13:33:53 mikeb 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/timetc.h>
#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 *);
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 */
};
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(": %d Hz, %d bits\n", ACPI_FREQUENCY,
psc->sc_fadt->flags & FADT_TMR_VAL_EXT ? 32 : 24);
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);
#if defined(__amd64__)
extern void cpu_recalibrate_tsc(struct timecounter *);
cpu_recalibrate_tsc(&acpi_timecounter);
#endif
}
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);
}
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