DMA_STAT
status = bus_space_read_4(sc->sc_iot, sc->sc_dmach, DMA_STAT(channel));
reg = bus_space_read_4(sc->sc_iot, sc->sc_dmach, DMA_STAT(channel_no));
reg = bus_space_read_4(sc->sc_iot, sc->sc_dmach, DMA_STAT(channel_no));
stat = DMA_STAT(dc);
dmastat = READ_DMAREG(esc, DMA_STAT);
if (READ_DMAREG(esc, DMA_STAT) & DMASTAT_BCMP)
dmastat = READ_DMAREG(esc, DMA_STAT);