DMAC_DCSR
dmac_reg_write(sc, DMAC_DCSR(dxs->dxs_channel),
dcsr = dmac_reg_read(sc, DMAC_DCSR(channel));
dmac_reg_write(sc, DMAC_DCSR(channel), dcsr);
if (dmac_reg_read(sc, DMAC_DCSR(channel)) & DCSR_STOPSTATE)
dmac_reg_write(sc, DMAC_DCSR(channel), dcsr & ~DCSR_RUN);
dmac_reg_write(sc, DMAC_DCSR(i), 0);
dmac_reg_write(sc, DMAC_DCSR(dxs->dxs_channel), 0);
rv = dmac_reg_read(sc, DMAC_DCSR(dxs->dxs_channel));