STE_DMACtrl
bus_space_write_4(sc->sc_st, sc->sc_sh, STE_DMACtrl, DC_TxDMAHalt);
bus_space_write_4(sc->sc_st, sc->sc_sh, STE_DMACtrl, DC_TxDMAResume);
bus_space_write_4(st, sh, STE_DMACtrl, sc->sc_DMACtrl | DC_RxDMAResume);
bus_space_write_4(sc->sc_st, sc->sc_sh, STE_DMACtrl,
if ((bus_space_read_4(sc->sc_st, sc->sc_sh, STE_DMACtrl) &
STE_DMACtrl, DC_TxDMAHalt);
STE_DMACtrl, DC_TxDMAResume);