static void
geode_wdog_disable(struct geode_wdog_softc *sc)
{
uint16_t wdcnfg;
/* cancel any pending countdown */
sc->sc_countdown = 0;
bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
SC1100_GCB_WDTO, 0);
/* power-down clock */
wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot,
sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG);
GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg));
wdcnfg |= SC1100_WDCNFG_WD32KPD;
wdcnfg &= ~(SC1100_WDCNFG_WDTYPE2_MASK | SC1100_WDCNFG_WDTYPE1_MASK);
/* This no-op is for the reader's benefit. */
wdcnfg |= SC1100_WDCNFG_WDTYPE1_NOACTION |
SC1100_WDCNFG_WDTYPE2_NOACTION;
bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
SC1100_GCB_WDCNFG, wdcnfg);
GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg));
}
static void
geode_gcb_attach(device_t parent, device_t self, void *aux)
{
struct geode_gcb_softc *sc = device_private(self);
struct pci_attach_args *pa = aux;
uint32_t cba;
u_int rev;
cba = pci_conf_read(pa->pa_pc, pa->pa_tag, SC1100_XBUS_CBA_SCRATCHPAD);
sc->sc_iot = pa->pa_iot;
if (bus_space_map(sc->sc_iot, (bus_addr_t)cba, SC1100_GCB_SIZE, 0,
&sc->sc_ioh) != 0) {
aprint_error(": unable to map registers\n");
return;
}
GEODE_DPRINTF(("%s: mapped %u bytes at %#08" PRIx32 "\n",
device_xname(self), SC1100_GCB_SIZE, cba));
rev = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SC1100_GCB_REV_B);
aprint_naive("\n");
aprint_normal(": AMD Geode GCB (rev. 0x%02x)\n", rev);
while (config_found(self, NULL, NULL) != NULL)
/* empty */;
}
static int
geode_wdog_setmode(struct sysmon_wdog *smw)
{
struct geode_wdog_softc *sc = smw->smw_cookie;
uint32_t ticks;
int prescale, s;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
s = splhigh();
geode_wdog_disable(sc);
splx(s);
return 0;
}
if (smw->smw_period == WDOG_PERIOD_DEFAULT)
smw->smw_period = 32;
else if (smw->smw_period > SC1100_WDIVL_MAX) /* too big? */
return EINVAL;
GEODE_DPRINTF(("%s: period %u\n", __func__, smw->smw_period));
ticks = smw->smw_period * SC1100_WDCLK_HZ;
GEODE_DPRINTF(("%s: ticks0 %" PRIu32 "\n", __func__, ticks));
for (prescale = 0; ticks > UINT16_MAX; prescale++)
ticks /= 2;
GEODE_DPRINTF(("%s: ticks %" PRIu32 "\n", __func__, ticks));
GEODE_DPRINTF(("%s: prescale %d\n", __func__, prescale));
KASSERT(prescale <= SC1100_WDCNFG_WDPRES_MAX);
KASSERT(ticks <= UINT16_MAX);
s = splhigh();
sc->sc_prescale = (uint8_t)prescale;
sc->sc_countdown = (uint16_t)ticks;
geode_wdog_enable(sc);
geode_wdog_reset(sc);
splx(s);
return 0;
}
static void
geode_wdog_enable(struct geode_wdog_softc *sc)
{
uint16_t wdcnfg;
/* power-up clock and set prescale */
wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot,
sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG);
GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg));
wdcnfg &= ~(SC1100_WDCNFG_WD32KPD | SC1100_WDCNFG_WDPRES_MASK |
SC1100_WDCNFG_WDTYPE1_MASK | SC1100_WDCNFG_WDTYPE2_MASK);
wdcnfg |= __SHIFTIN(sc->sc_prescale, SC1100_WDCNFG_WDPRES_MASK);
wdcnfg |= SC1100_WDCNFG_WDTYPE1_RESET | SC1100_WDCNFG_WDTYPE2_NOACTION;
bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
SC1100_GCB_WDCNFG, wdcnfg);
GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg));
}
static void
geode_wdog_attach(device_t parent, device_t self, void *aux)
{
struct geode_wdog_softc *sc = device_private(self);
uint8_t wdsts;
aprint_naive(": Watchdog Timer\n");
aprint_normal(": AMD Geode SC1100 Watchdog Timer\n");
/*
* Hook up the watchdog timer.
*/
sc->sc_gcb_dev = device_private(parent);
sc->sc_smw.smw_name = device_xname(self);
sc->sc_smw.smw_cookie = sc;
sc->sc_smw.smw_setmode = geode_wdog_setmode;
sc->sc_smw.smw_tickle = geode_wdog_tickle;
sc->sc_smw.smw_period = 32;
/*
* Determine cause of the last reset, and issue a warning if it
* was due to watchdog expiry.
*/
wdsts = bus_space_read_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
SC1100_GCB_WDSTS);
GEODE_DPRINTF(("%s: status %#02" PRIx8 "\n", device_xname(self),
wdsts));
if (wdsts & SC1100_WDSTS_WDRST)
aprint_error(
"%s: WARNING: LAST RESET DUE TO WATCHDOG EXPIRATION!\n",
device_xname(self));
/* reset WDOVF by writing 1 to it */
bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
SC1100_GCB_WDSTS, wdsts & SC1100_WDSTS_WDOVF);
if (sysmon_wdog_register(&sc->sc_smw) != 0)
aprint_error("%s: unable to register watchdog with sysmon\n",
device_xname(self));
/* cancel any pending countdown */
geode_wdog_disable(sc);
attached = 1;
}
