SPI_DMA_INTR_RD_IMWR_DATA
writel(0, spi_bus->dma_offset_bar + SPI_DMA_INTR_RD_IMWR_DATA);
regval = readl(spi_bus->dma_offset_bar + SPI_DMA_INTR_RD_IMWR_DATA);
SPI_DMA_INTR_RD_IMWR_DATA);
regval = readl(spi_bus->dma_offset_bar + SPI_DMA_INTR_RD_IMWR_DATA);