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/* $OpenBSD: acpihpet.c,v 1.7 2009/01/20 20:23:57 kettenis 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>
#include <dev/acpi/acpidev.h>
int acpihpet_match(struct device *, void *, void *);
void acpihpet_attach(struct device *, struct device *, void *);
#ifdef __HAVE_TIMECOUNTER
u_int acpihpet_gettime(struct timecounter *tc);
static struct timecounter hpet_timecounter = {
acpihpet_gettime, /* get_timecount */
0, /* no poll_pps */
0xffffffff, /* counter_mask (24 bits) */
0, /* frequency */
0, /* name */
1000 /* quality */
};
#endif
struct acpihpet_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct cfattach acpihpet_ca = {
sizeof(struct acpihpet_softc), acpihpet_match, acpihpet_attach
};
struct cfdriver acpihpet_cd = {
NULL, "acpihpet", DV_DULL
};
int
acpihpet_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct acpi_table_header *hdr;
/*
* If we do not have a table, it is not us
*/
if (aaa->aaa_table == NULL)
return (0);
/*
* If it is an HPET table, we can attach
*/
hdr = (struct acpi_table_header *)aaa->aaa_table;
if (memcmp(hdr->signature, HPET_SIG, sizeof(HPET_SIG) - 1) != 0)
return (0);
return (1);
}
void
acpihpet_attach(struct device *parent, struct device *self, void *aux)
{
struct acpihpet_softc *sc = (struct acpihpet_softc *) self;
struct acpi_softc *psc = (struct acpi_softc *)parent;
struct acpi_attach_args *aaa = aux;
struct acpi_hpet *hpet = (struct acpi_hpet *)aaa->aaa_table;
u_int64_t period, freq; /* timer period in femtoseconds (10^-15) */
u_int32_t v1, v2;
int timeout;
if (acpi_map_address(psc, &hpet->base_address, 0, HPET_REG_SIZE,
&sc->sc_ioh, &sc->sc_iot)) {
printf(": can't map i/o space\n");
return;
}
/*
* Revisions 0x30 through 0x3a of the AMD SB700, with spread
* spectrum enabled, have an SMM based HPET emulation that's
* subtly broken. The hardware is initialized upon first
* access of the configuration register. Initialization takes
* some time during which the configuration register returns
* 0xffffffff.
*/
timeout = 1000;
do {
if (bus_space_read_4(sc->sc_iot, sc->sc_ioh,
HPET_CONFIGURATION) != 0xffffffff)
break;
} while(--timeout > 0);
if (timeout == 0) {
printf(": disabled\n");
return;
}
/* enable hpet */
bus_space_write_4(sc->sc_iot, sc->sc_ioh, HPET_CONFIGURATION, 1);
/* make sure hpet is working */
v1 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER);
delay(1);
v2 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER);
if (v1 == v2) {
printf(": counter not incrementing\n");
bus_space_write_4(sc->sc_iot, sc->sc_ioh,
HPET_CONFIGURATION, 0);
return;
}
period = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
HPET_CAPABILITIES + sizeof(u_int32_t));
if (period == 0) {
printf(": invalid period\n");
bus_space_write_4(sc->sc_iot, sc->sc_ioh,
HPET_CONFIGURATION, 0);
return;
}
freq = 1000000000000000ull / period;
printf(": %lld Hz\n", freq);
#ifdef __HAVE_TIMECOUNTER
hpet_timecounter.tc_frequency = (u_int32_t)freq;
hpet_timecounter.tc_priv = sc;
hpet_timecounter.tc_name = sc->sc_dev.dv_xname;
tc_init(&hpet_timecounter);
#endif
}
#ifdef __HAVE_TIMECOUNTER
u_int
acpihpet_gettime(struct timecounter *tc)
{
struct acpihpet_softc *sc = tc->tc_priv;
return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER));
}
#endif
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