bus_space_write_stream_2
#define CSR_WRITE_STREAM_2(sc, reg, val) ((sc->prohibit_access_reg)?:bus_space_write_stream_2(sc->re_btag, sc->re_bhandle, reg, val))
bus_space_write_stream_2(sc->wi_btag, sc->wi_bhandle, \
bus_space_write_stream_2((r)->r_bustag, (r)->r_bushandle, (o), (v))