SUNXI_HCI_ICR
val = bus_space_read_4(sc->sc.iot, sc->sc.ioh, SUNXI_HCI_ICR);
bus_space_write_4(sc->sc.iot, sc->sc.ioh, SUNXI_HCI_ICR, val);
val = bus_space_read_4(sc->sc.iot, sc->sc.ioh, SUNXI_HCI_ICR);
bus_space_write_4(sc->sc.iot, sc->sc.ioh, SUNXI_HCI_ICR, val);