DMA_MODE_CLEAR
__raw_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);
__raw_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
__raw_writel(~mode, chan->io + DMA_MODE_CLEAR);
__raw_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
__raw_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);