OHCI_FM_INTERVAL
fm = (OREAD4(sc, OHCI_FM_INTERVAL) & OHCI_FM_FIT) ^ OHCI_FM_FIT;
OWRITE4(sc, OHCI_FM_INTERVAL, fm);
OREAD4(sc, OHCI_FM_INTERVAL),
fm = OREAD4(sc, OHCI_FM_INTERVAL);