SCA_DSR1
dsr = dmac_read_1(scp, SCA_DSR1);
dmac_write_1(scp, SCA_DSR1,
dmac_write_1(scp, SCA_DSR1, SCA_DSR_DE);
sca_write_1(sc, SCA_DSR1 + SCA_DMAC_OFF_0, 0);
sca_write_1(sc, SCA_DSR1 + SCA_DMAC_OFF_1, 0);
dmac_write_1(scp, SCA_DSR1, 0);