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/* $OpenBSD: hpet.c,v 1.1 2005/06/02 20:09:39 tholo 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/hpetreg.h>
int hpetmatch(struct device *, void *, void *);
void hpetattach(struct device *, struct device *, void *);
#ifdef __HAVE_TIMECOUNTER
u_int hpet_get_timecount(struct timecounter *tc);
static struct timecounter hpet_timecounter = {
hpet_get_timecount, /* get_timecount */
0, /* no poll_pps */
0xffffffff, /* counter_mask (24 bits) */
0, /* frequency */
0, /* name */
1000 /* quality */
};
#endif
struct hpet_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct cfattach hpet_ca = {
sizeof(struct hpet_softc), hpetmatch, hpetattach
};
struct cfdriver hpet_cd = {
NULL, "hpet", DV_DULL
};
int
hpetmatch(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
hpetattach(struct device *parent, struct device *self, void *aux)
{
struct hpet_softc *sc = (struct hpet_softc *) self;
struct acpi_attach_args *aa = aux;
struct acpi_hpet *hpet = (struct acpi_hpet *)aa->aaa_table;
u_int64_t period, freq; /* timer period in femtoseconds (10^-15) */
switch (hpet->base_address.address_space_id) {
case GAS_SYSTEM_MEMORY:
sc->sc_iot = aa->aaa_memt;
break;
case GAS_SYSTEM_IOSPACE:
sc->sc_iot = aa->aaa_iot;
break;
#if 0
case GAS_SYSTEM_PCI_CFG_SPACE:
sc->sc_iot = aa->aaa_pcit;
break;
case GAS_SYSTEM_SMBUS:
sc->sc_iot = aa->aaa_smbust;
break;
#endif
default:
printf(": can't identify bus\n");
return;
}
if (bus_space_map(sc->sc_iot, hpet->base_address.address, HPET_REG_SIZE,
0, &sc->sc_ioh)) {
printf(": can't map i/o space\n");
return;
}
period = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
HPET_CAPABILITIES + sizeof(u_int32_t));
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
hpet_get_timecount(struct timecounter *tc)
{
struct hpet_softc *sc = tc->tc_priv;
return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER));
}
#endif
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