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    Subject[PATCH v2 10/14] spi: stm32: add start dma transfer function
    Date
    From: Cezary Gapinski <cezary.gapinski@gmail.com>

    Add transfer_one_dma_start function to be more generic for other
    stm32 SPI family drivers.

    Signed-off-by: Cezary Gapinski <cezary.gapinski@gmail.com>
    ---
    drivers/spi/spi-stm32.c | 27 ++++++++++++++++++---------
    1 file changed, 18 insertions(+), 9 deletions(-)

    diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
    index bc8513f..b19d02b 100644
    --- a/drivers/spi/spi-stm32.c
    +++ b/drivers/spi/spi-stm32.c
    @@ -748,6 +748,23 @@ static int stm32_spi_transfer_one_irq(struct stm32_spi *spi)
    }

    /**
    + * stm32_spi_transfer_one_dma_start - Set SPI driver registers to start transfer
    + * using DMA
    + */
    +static void stm32_spi_transfer_one_dma_start(struct stm32_spi *spi)
    +{
    + /* Enable the interrupts relative to the end of transfer */
    + stm32_spi_set_bits(spi, STM32H7_SPI_IER, STM32H7_SPI_IER_EOTIE |
    + STM32H7_SPI_IER_TXTFIE |
    + STM32H7_SPI_IER_OVRIE |
    + STM32H7_SPI_IER_MODFIE);
    +
    + stm32_spi_enable(spi);
    +
    + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART);
    +}
    +
    +/**
    * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
    *
    * It must returns 0 if the transfer is finished or 1 if the transfer is still
    @@ -759,7 +776,6 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi,
    struct dma_slave_config tx_dma_conf, rx_dma_conf;
    struct dma_async_tx_descriptor *tx_dma_desc, *rx_dma_desc;
    unsigned long flags;
    - u32 ier = 0;

    spin_lock_irqsave(&spi->lock, flags);

    @@ -829,14 +845,7 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi,
    STM32H7_SPI_CFG1_TXDMAEN);
    }

    - /* Enable the interrupts relative to the end of transfer */
    - ier |= STM32H7_SPI_IER_EOTIE | STM32H7_SPI_IER_TXTFIE |
    - STM32H7_SPI_IER_OVRIE | STM32H7_SPI_IER_MODFIE;
    - writel_relaxed(ier, spi->base + STM32H7_SPI_IER);
    -
    - stm32_spi_enable(spi);
    -
    - stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART);
    + stm32_spi_transfer_one_dma_start(spi);

    spin_unlock_irqrestore(&spi->lock, flags);

    --
    2.7.4
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