CDMAC_CURDESC
op(DCR_CDMAC_BASE, channel + CDMAC_CURDESC)
op(base, channel + CDMAC_CURDESC)
bus_space_write_4((sc)->sc_dma_rxt, (sc)->sc_dma_rxh, CDMAC_CURDESC, (val))
bus_space_write_4((sc)->sc_dma_txt, (sc)->sc_dma_txh, CDMAC_CURDESC, (val))
bus_space_write_4(lsc->lsc_dma_iot, lsc->lsc_dma_ioh, CDMAC_CURDESC,