SE_DMA_TX_IRQ_CLR
writel_relaxed(dm_tx_st, base + SE_DMA_TX_IRQ_CLR);
writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
writel(dma_tx_status, se->base + SE_DMA_TX_IRQ_CLR);
writel(dma_tx_status, uport->membase + SE_DMA_TX_IRQ_CLR);