C++ (Cpp) spi_imx_can_dma Examples

Example #1

File: spi-imx.c Project: lixuhui112/myimx6-linux

static int spi_imx_setupxfer(struct spi_device *spi,
				 struct spi_transfer *t)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	struct spi_imx_config config;
	int ret;

	config.bpw = t ? t->bits_per_word : spi->bits_per_word;
	config.speed_hz  = t ? t->speed_hz : spi->max_speed_hz;
	config.mode = spi->mode;
	config.cs = spi->chip_select;

	if (!config.speed_hz)
		config.speed_hz = spi->max_speed_hz;
	if (!config.bpw)
		config.bpw = spi->bits_per_word;

	/* Initialize the functions for transfer */
	if (config.bpw <= 8) {
		spi_imx->rx = spi_imx_buf_rx_u8;
		spi_imx->tx = spi_imx_buf_tx_u8;
		spi_imx->tx_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
		spi_imx->rx_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
	} else if (config.bpw <= 16) {
		spi_imx->rx = spi_imx_buf_rx_u16;
		spi_imx->tx = spi_imx_buf_tx_u16;
		spi_imx->tx_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
		spi_imx->rx_config.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	} else {
		spi_imx->rx = spi_imx_buf_rx_u32;
		spi_imx->tx = spi_imx_buf_tx_u32;
		spi_imx->tx_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		spi_imx->rx_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	}

	if (spi_imx->bitbang.master->can_dma &&
	    spi_imx_can_dma(spi_imx->bitbang.master, spi, t)) {
		ret = dmaengine_slave_config(spi_imx->bitbang.master->dma_tx,
						&spi_imx->tx_config);
		if (ret) {
			dev_err(&spi->dev, "error in TX dma configuration.\n");
			return ret;
		}

		ret = dmaengine_slave_config(spi_imx->bitbang.master->dma_rx,
						&spi_imx->rx_config);
		if (ret) {
			dev_err(&spi->dev, "error in RX dma configuration.\n");
			return ret;
		}
	}

	spi_imx->devtype_data->config(spi_imx, &config);

	return 0;
}

Example #2

File: spi-imx.c Project: GAXUSXX/G935FGaXusKernel2

static int spi_imx_transfer(struct spi_device *spi,
				struct spi_transfer *transfer)
{
	int ret;
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);

	if (spi_imx->bitbang.master->can_dma &&
	    spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) {
		spi_imx->usedma = true;
		ret = spi_imx_dma_transfer(spi_imx, transfer);
		if (ret != -EAGAIN)
			return ret;
	}
	spi_imx->usedma = false;

	return spi_imx_pio_transfer(spi, transfer);
}

Example #3

File: spi-imx.c Project: acton393/linux

static int spi_imx_setupxfer(struct spi_device *spi,
				 struct spi_transfer *t)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	struct spi_imx_config config;
	int ret;

	config.bpw = t ? t->bits_per_word : spi->bits_per_word;
	config.speed_hz  = t ? t->speed_hz : spi->max_speed_hz;

	if (!config.speed_hz)
		config.speed_hz = spi->max_speed_hz;
	if (!config.bpw)
		config.bpw = spi->bits_per_word;

	/* Initialize the functions for transfer */
	if (config.bpw <= 8) {
		spi_imx->rx = spi_imx_buf_rx_u8;
		spi_imx->tx = spi_imx_buf_tx_u8;
	} else if (config.bpw <= 16) {
		spi_imx->rx = spi_imx_buf_rx_u16;
		spi_imx->tx = spi_imx_buf_tx_u16;
	} else {
		spi_imx->rx = spi_imx_buf_rx_u32;
		spi_imx->tx = spi_imx_buf_tx_u32;
	}

	if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
		spi_imx->usedma = 1;
	else
		spi_imx->usedma = 0;

	if (spi_imx->usedma) {
		ret = spi_imx_dma_configure(spi->master,
					    spi_imx_bytes_per_word(config.bpw));
		if (ret)
			return ret;
	}

	spi_imx->devtype_data->config(spi, &config);

	return 0;
}