MX51_ECSPI_DMA
reg = readl(spi_imx->base + MX51_ECSPI_DMA);
writel(reg, spi_imx->base + MX51_ECSPI_DMA);
MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);