C++ (Cpp) omap2_mcspi_set_dma_req示例

示例#1

文件： spi-omap2-mcspi.c 项目： Anjali05/linux

static void omap2_mcspi_tx_dma(struct spi_device *spi,
				struct spi_transfer *xfer,
				struct dma_slave_config cfg)
{
	struct omap2_mcspi	*mcspi;
	struct omap2_mcspi_dma  *mcspi_dma;

	mcspi = spi_master_get_devdata(spi->master);
	mcspi_dma = &mcspi->dma_channels[spi->chip_select];

	if (mcspi_dma->dma_tx) {
		struct dma_async_tx_descriptor *tx;

		dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);

		tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl,
					     xfer->tx_sg.nents,
					     DMA_MEM_TO_DEV,
					     DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
		if (tx) {
			tx->callback = omap2_mcspi_tx_callback;
			tx->callback_param = spi;
			dmaengine_submit(tx);
		} else {
			/* FIXME: fall back to PIO? */
		}
	}
	dma_async_issue_pending(mcspi_dma->dma_tx);
	omap2_mcspi_set_dma_req(spi, 0, 1);

}

示例#2

文件： spi-omap2-mcspi.c 项目： imcek/BEAGLEBONE_BSP

static void omap2_mcspi_tx_callback(void *data)
{
	struct spi_device *spi = data;
	struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
	struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];

	/* We must disable the DMA TX request */
	omap2_mcspi_set_dma_req(spi, 0, 0);

	complete(&mcspi_dma->dma_tx_completion);
}

示例#3

文件： spi-omap2-mcspi.c 项目： imcek/BEAGLEBONE_BSP

static void omap2_mcspi_tx_dma(struct spi_device *spi,
				struct spi_transfer *xfer,
				struct dma_slave_config cfg)
{
	struct omap2_mcspi	*mcspi;
	struct omap2_mcspi_dma  *mcspi_dma;
	unsigned int		count;

	mcspi = spi_master_get_devdata(spi->master);
	mcspi_dma = &mcspi->dma_channels[spi->chip_select];
	count = xfer->len;

	if (mcspi_dma->dma_tx) {
		struct dma_async_tx_descriptor *tx;
		struct scatterlist sg;

		dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);

		sg_init_table(&sg, 1);
		sg_dma_address(&sg) = xfer->tx_dma;
		sg_dma_len(&sg) = xfer->len;

		tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
		DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
		if (tx) {
			tx->callback = omap2_mcspi_tx_callback;
			tx->callback_param = spi;
			dmaengine_submit(tx);
		} else {
			/* FIXME: fall back to PIO? */
		}
	}
	dma_async_issue_pending(mcspi_dma->dma_tx);
	omap2_mcspi_set_dma_req(spi, 0, 1);

}