DM_TIOCP_CFG
bus_space_write_4(sc->sc_iot, ioh, DM_TIOCP_CFG,
while (bus_space_read_4(sc->sc_iot, ioh, DM_TIOCP_CFG)
cfg = bus_space_read_4(sc->sc_iot, ioh, DM_TIOCP_CFG);
bus_space_write_4(sc->sc_iot, ioh, DM_TIOCP_CFG,