I2S_SADR
bus_space_write_4(sc->sc_iot, sc->sc_ioh, I2S_SADR, data);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, I2S_SADR, 0);
sc->sc_dr.ds_addr = PXA2X0_I2S_BASE + I2S_SADR;