ESO_IO_IRQCTL
tmp = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL, tmp);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL,
irqctl = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL);