626a96db11
This patch adds DMA support for the EP93xx SPI driver. By default the DMA is not enabled but it can be enabled by setting ep93xx_spi_info.use_dma to true in board configuration file. Note that the SPI driver still uses PIO for small transfers (<= 8 bytes) for performance reasons. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
30 lines
780 B
C
30 lines
780 B
C
#ifndef __ASM_MACH_EP93XX_SPI_H
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#define __ASM_MACH_EP93XX_SPI_H
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struct spi_device;
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/**
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* struct ep93xx_spi_info - EP93xx specific SPI descriptor
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* @num_chipselect: number of chip selects on this board, must be
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* at least one
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* @use_dma: use DMA for the transfers
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*/
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struct ep93xx_spi_info {
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int num_chipselect;
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bool use_dma;
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};
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/**
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* struct ep93xx_spi_chip_ops - operation callbacks for SPI slave device
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* @setup: setup the chip select mechanism
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* @cleanup: cleanup the chip select mechanism
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* @cs_control: control the device chip select
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*/
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struct ep93xx_spi_chip_ops {
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int (*setup)(struct spi_device *spi);
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void (*cleanup)(struct spi_device *spi);
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void (*cs_control)(struct spi_device *spi, int value);
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};
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#endif /* __ASM_MACH_EP93XX_SPI_H */
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