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Unverified Commit f8bb12f2 authored by Cezary Gapinski's avatar Cezary Gapinski Committed by Mark Brown
Browse files

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: default avatarCezary Gapinski <cezary.gapinski@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 9d5fce16

drivers/spi/spi-stm32.c

+18 −9
Original line number Diff line number Diff line
@@ -747,6 +747,23 @@ static int stm32_spi_transfer_one_irq(struct stm32_spi *spi) 
	return 1;

}



/**

 * 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

 *
@@ -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);