DMA_IRQ_PEND_REG1
DMA_WRITE(sc, DMA_IRQ_PEND_REG1, ~0);
pend1 = sc->nchans > 8 ? DMA_READ(sc, DMA_IRQ_PEND_REG1) : 0;
DMA_WRITE(sc, DMA_IRQ_PEND_REG1, pend1);