SPI_DMA_GLOBAL_RD_ENGINE_EN
writel(SPI_DMA_ENGINE_EN, spi_bus->dma_offset_bar + SPI_DMA_GLOBAL_RD_ENGINE_EN);
par->dma_offset_bar + SPI_DMA_GLOBAL_RD_ENGINE_EN);
SPI_DMA_GLOBAL_RD_ENGINE_EN, regval,
par->dma_offset_bar + SPI_DMA_GLOBAL_RD_ENGINE_EN);