Exemplos de rockchip_spi_pio_transfer em C++ (Cpp)

Exemplo n.º 1

Arquivo: spi-rockchip.c Projeto: AkyZero/wrapfs-latest

static int rockchip_spi_transfer_one(
		struct spi_master *master,
		struct spi_device *spi,
		struct spi_transfer *xfer)
{
	int ret = 0;
	struct rockchip_spi *rs = spi_master_get_devdata(master);

	WARN_ON((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));

	if (!xfer->tx_buf && !xfer->rx_buf) {
		dev_err(rs->dev, "No buffer for transfer\n");
		return -EINVAL;
	}

	rs->speed = xfer->speed_hz;
	rs->bpw = xfer->bits_per_word;
	rs->n_bytes = rs->bpw >> 3;

	rs->tx = xfer->tx_buf;
	rs->tx_end = rs->tx + xfer->len;
	rs->rx = xfer->rx_buf;
	rs->rx_end = rs->rx + xfer->len;
	rs->len = xfer->len;

	rs->tx_sg = xfer->tx_sg;
	rs->rx_sg = xfer->rx_sg;

	if (rs->tx && rs->rx)
		rs->tmode = CR0_XFM_TR;
	else if (rs->tx)
		rs->tmode = CR0_XFM_TO;
	else if (rs->rx)
		rs->tmode = CR0_XFM_RO;

	if (master->can_dma && master->can_dma(master, spi, xfer))
		rs->use_dma = 1;
	else
		rs->use_dma = 0;

	rockchip_spi_config(rs);

	if (rs->use_dma)
		ret = rockchip_spi_dma_transfer(rs);
	else
		ret = rockchip_spi_pio_transfer(rs);

	return ret;
}

Exemplo n.º 2

Arquivo: spi-rockchip.c Projeto: Abioy/kasan

static int rockchip_spi_transfer_one(
		struct spi_master *master,
		struct spi_device *spi,
		struct spi_transfer *xfer)
{
	int ret = 1;
	struct rockchip_spi *rs = spi_master_get_devdata(master);

	WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
		(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));

	if (!xfer->tx_buf && !xfer->rx_buf) {
		dev_err(rs->dev, "No buffer for transfer\n");
		return -EINVAL;
	}

	rs->speed = xfer->speed_hz;
	rs->bpw = xfer->bits_per_word;
	rs->n_bytes = rs->bpw >> 3;

	rs->tx = xfer->tx_buf;
	rs->tx_end = rs->tx + xfer->len;
	rs->rx = xfer->rx_buf;
	rs->rx_end = rs->rx + xfer->len;
	rs->len = xfer->len;

	rs->tx_sg = xfer->tx_sg;
	rs->rx_sg = xfer->rx_sg;

	if (rs->tx && rs->rx)
		rs->tmode = CR0_XFM_TR;
	else if (rs->tx)
		rs->tmode = CR0_XFM_TO;
	else if (rs->rx)
		rs->tmode = CR0_XFM_RO;

	/* we need prepare dma before spi was enabled */
	if (master->can_dma && master->can_dma(master, spi, xfer))
		rs->use_dma = 1;
	else
		rs->use_dma = 0;

	rockchip_spi_config(rs);

	if (rs->use_dma) {
		if (rs->tmode == CR0_XFM_RO) {
			/* rx: dma must be prepared first */
			rockchip_spi_prepare_dma(rs);
			spi_enable_chip(rs, 1);
		} else {
			/* tx or tr: spi must be enabled first */
			spi_enable_chip(rs, 1);
			rockchip_spi_prepare_dma(rs);
		}
	} else {
		spi_enable_chip(rs, 1);
		ret = rockchip_spi_pio_transfer(rs);
	}

	return ret;
}