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>
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@ -747,6 +747,23 @@ static int stm32_spi_transfer_one_irq(struct stm32_spi *spi)
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return 1;
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}
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/**
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* stm32_spi_transfer_one_dma_start - Set SPI driver registers to start transfer
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* using DMA
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*/
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static void stm32_spi_transfer_one_dma_start(struct stm32_spi *spi)
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{
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/* Enable the interrupts relative to the end of transfer */
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stm32_spi_set_bits(spi, STM32H7_SPI_IER, STM32H7_SPI_IER_EOTIE |
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STM32H7_SPI_IER_TXTFIE |
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STM32H7_SPI_IER_OVRIE |
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STM32H7_SPI_IER_MODFIE);
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stm32_spi_enable(spi);
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stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART);
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}
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/**
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* stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
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*
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@ -759,7 +776,6 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi,
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struct dma_slave_config tx_dma_conf, rx_dma_conf;
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struct dma_async_tx_descriptor *tx_dma_desc, *rx_dma_desc;
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unsigned long flags;
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u32 ier = 0;
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spin_lock_irqsave(&spi->lock, flags);
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@ -829,14 +845,7 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi,
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STM32H7_SPI_CFG1_TXDMAEN);
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}
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/* Enable the interrupts relative to the end of transfer */
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ier |= STM32H7_SPI_IER_EOTIE | STM32H7_SPI_IER_TXTFIE |
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STM32H7_SPI_IER_OVRIE | STM32H7_SPI_IER_MODFIE;
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writel_relaxed(ier, spi->base + STM32H7_SPI_IER);
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stm32_spi_enable(spi);
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stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART);
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stm32_spi_transfer_one_dma_start(spi);
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spin_unlock_irqrestore(&spi->lock, flags);
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