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/* $OpenBSD: acpitimer.c,v 1.16 2022/08/25 17:43:34 cheloha 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/stdint.h>
#include <sys/timetc.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
struct acpitimer_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
int acpitimermatch(struct device *, void *, void *);
void acpitimerattach(struct device *, struct device *, void *);
void acpitimer_delay(int);
u_int acpi_get_timecount(struct timecounter *tc);
uint32_t acpitimer_read(struct acpitimer_softc *);
static struct timecounter acpi_timecounter = {
.tc_get_timecount = acpi_get_timecount,
.tc_poll_pps = 0,
.tc_counter_mask = 0x00ffffff, /* 24 bits */
.tc_frequency = ACPI_FREQUENCY,
.tc_name = 0,
.tc_quality = 1000,
.tc_priv = NULL,
.tc_user = 0,
};
const 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);
delay_init(acpitimer_delay, 1000);
#if defined(__amd64__)
extern void cpu_recalibrate_tsc(struct timecounter *);
cpu_recalibrate_tsc(&acpi_timecounter);
#endif
}
void
acpitimer_delay(int usecs)
{
uint64_t count = 0, cycles;
struct acpitimer_softc *sc = acpi_timecounter.tc_priv;
uint32_t mask = acpi_timecounter.tc_counter_mask;
uint32_t val1, val2;
val2 = acpitimer_read(sc);
cycles = usecs * acpi_timecounter.tc_frequency / 1000000;
while (count < cycles) {
CPU_BUSY_CYCLE();
val1 = val2;
val2 = acpitimer_read(sc);
count += (val2 - val1) & mask;
}
}
u_int
acpi_get_timecount(struct timecounter *tc)
{
return acpitimer_read(tc->tc_priv);
}
uint32_t
acpitimer_read(struct acpitimer_softc *sc)
{
uint32_t 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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