Hi,
On Mon, Jun 07, 2010 at 20:39:07, Brian Niebuhr wrote:
>
> Signed-off-by: Brian Niebuhr <bnieb...@efjohnson.com>
> ---
> arch/arm/mach-davinci/include/mach/spi.h | 41 +-
> drivers/spi/davinci_spi.c | 936
> ++++++++++++++++++++++++++++++
> drivers/spi/davinci_spi.h | 186 ++++++
> 3 files changed, 1149 insertions(+), 14 deletions(-)
> create mode 100644 drivers/spi/davinci_spi.c
> create mode 100644 drivers/spi/davinci_spi.h
>
> diff --git a/arch/arm/mach-davinci/include/mach/spi.h
> b/arch/arm/mach-davinci/include/mach/spi.h
> index 910efbf..10c39d8 100644
> --- a/arch/arm/mach-davinci/include/mach/spi.h
> +++ b/arch/arm/mach-davinci/include/mach/spi.h
> @@ -19,26 +19,39 @@
> #ifndef __ARCH_ARM_DAVINCI_SPI_H
> #define __ARCH_ARM_DAVINCI_SPI_H
>
> +#define SPI_INTERN_CS 0xFF
> +
> +/* resource flags for IORESOURCE_DMA resources */
> +#define IORESOURCE_DMA_RX_CHAN 0x01
> +#define IORESOURCE_DMA_TX_CHAN 0x02
> +#define IORESOURCE_DMA_EVENT_Q 0x04
> +
> enum {
> - SPI_VERSION_1, /* For DM355/DM365/DM6467 */
> + SPI_VERSION_1, /* For DM355/DM365/DM6467*/
Above line in the patch is not required.
[...]
> +/*
> + * davinci_spi_probe - probe function for SPI Master Controller
> + * @pdev: platform_device structure which contains plateform specific data
> + *
> + * According to Linux Device Model this function will be invoked by Linux
> + * with plateform_device struct which contains the device specific info.
> + * This function will map the SPI controller's memory, register IRQ,
> + * Reset SPI controller and setting its registers to default value.
> + * It will invoke spi_bitbang_start to create work queue so that client
> driver
> + * can register transfer method to work queue.
> + */
> +static int davinci_spi_probe(struct platform_device *pdev)
> +{
[...]
> +
> + davinci_spi->version = pdata->version;
> +
> + davinci_spi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP;
> + if (davinci_spi->version == SPI_VERSION_2)
> + davinci_spi->bitbang.flags |= SPI_READY;
> +
> + dma_rx_chan = davinci_spi_get_dma_by_flag(pdev, IORESOURCE_DMA_RX_CHAN);
> + dma_tx_chan = davinci_spi_get_dma_by_flag(pdev, IORESOURCE_DMA_TX_CHAN);
> + dma_eventq = davinci_spi_get_dma_by_flag(pdev, IORESOURCE_DMA_EVENT_Q);
> + davinci_spi->dma_channels.dma_rx_channel = -1;
> + davinci_spi->dma_channels.dma_rx_sync_dev = dma_rx_chan;
> + davinci_spi->dma_channels.dma_tx_channel = -1;
> + davinci_spi->dma_channels.dma_tx_sync_dev = dma_tx_chan;
> + davinci_spi->dma_channels.dummy_param_slot = -1;
> + davinci_spi->dma_channels.eventq = dma_eventq;
Can the above configurations be done only in case if DMA mode?
[...]
> + ret = spi_bitbang_start(&davinci_spi->bitbang);
> + if (ret != 0)
> + goto free_clk;
> +
> + dev_info(&pdev->dev, "Controller at 0x%p \n", davinci_spi->base);
> +
Some way of informing the user about the mode in which the driver is
working is desirable.
Regards,
Sudhakar
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