DMA_ST_CHAN
case DMA_ST_OVER | DMA_ST_INT | DMA_ST_CHAN:
if (status & DMA_ST_CHAN) {
case DMA_ST_INT | DMA_ST_CHAN:
if (status & DMA_ST_CHAN) {
#define DMA_ST_MASK (DMA_ST_CHAN | DMA_ST_INT | DMA_ST_OVER)