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);
}
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);
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);
acpihpet_attached++;
}
