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spi: stm32: add start dma transfer function

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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>
This commit is contained in:
Cezary Gapinski 2018-12-24 23:00:36 +01:00 committed by Mark Brown
parent 9d5fce166c
commit f8bb12f2fa
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GPG Key ID: 24D68B725D5487D0
1 changed files with 18 additions and 9 deletions
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27
drivers/spi/spi-stm32.c
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@ -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);