EHCI_USBINTR
bus_write_4(res, offs + EHCI_USBINTR, 0);
EOWRITE4(sc, EHCI_USBINTR, sc->sc_eintrs);
EOWRITE4(sc, EHCI_USBINTR, sc->sc_eintrs);
EOWRITE4(sc, EHCI_USBINTR, sc->sc_eintrs);
EOWRITE4(sc, EHCI_USBINTR, sc->sc_eintrs);
EOWRITE4(sc, EHCI_USBINTR, 0);
EOREAD4(sc, EHCI_USBINTR));