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| author | Cezary Gapinski <cezary.gapinski@gmail.com> | 2018-12-25 01:00:36 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-01-07 21:25:22 +0300 |
| commit | f8bb12f2fa4f05c8a957abf4a77e268dd7af2558 (patch) | |
| tree | a25078884e2765c2908b61120742495e1b4b9fa4 /drivers/spi/spi-stm32.c | |
| parent | 9d5fce166c7a26ed9811f9b0ae914a079e62c0f8 (diff) | |
| download | linux-f8bb12f2fa4f05c8a957abf4a77e268dd7af2558.tar.xz | |
spi: stm32: add start dma transfer function
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>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-stm32.c')
| -rw-r--r-- | drivers/spi/spi-stm32.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index bc8513f088aa..b19d02bf0188 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); |