AT_DMA_RES
dma_writel(atdma, CHDR, AT_DMA_RES(chan_id));
dma_writel(atdma, CHDR, AT_DMA_RES(chan_id) | atchan->mask);
dma_writel(atchan->atdma, CHDR, AT_DMA_RES(i) | atchan->mask);