[PATCH v4] spi: spi-imx: add DMA support
From: Robin Gong <hidden>
Date: 2014-08-28 10:08:19
Also in:
linux-spi, lkml
On Wed, Aug 27, 2014 at 11:12:08AM +0530, sanjeev sharma wrote:
On Sat, Aug 23, 2014 at 5:43 AM, Robin Gong [off-list ref] wrote:quoted
+ /* + * Configure the DMA register: setup the watermark + * and enable DMA request. + */ + if (spi_imx->dma_is_inited) { + dma = readl(spi_imx->base + MX51_ECSPI_DMA); + + spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2; + spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2; + spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2; + rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET; + tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET; + rxt_wml_cfg = spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET; + dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK + & ~MX51_ECSPI_DMA_RX_WML_MASK + & ~MX51_ECSPI_DMA_RXT_WML_MASK) + | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg + |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET) + |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET) + |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET); +IMO, we should have an seperate function for dmactrl,rx_threshold & tx_threshold for better visiblity.
I understood your concern, but I don't want to create one function only for setting some bit fields of the register.
quoted
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