OHCI_FM_INTERVAL
ival = OHCI_GET_IVAL(OREAD4(sc, OHCI_FM_INTERVAL));
fm = (OREAD4(sc, OHCI_FM_INTERVAL) & OHCI_FIT) ^ OHCI_FIT;
OWRITE4(sc, OHCI_FM_INTERVAL, fm);
OREAD4(sc, OHCI_FM_INTERVAL),