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This is needed by the spi-mem logic to force all messages that have been queued before a memory operation to be sent before we start the memory operation. We do that in order to guarantee that spi-mem operations do not preempt regular SPI transfers. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Mark Brown <broonie@kernel.org>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2018 Exceet Electronics GmbH
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* Copyright (C) 2018 Bootlin
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*
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* Author: Boris Brezillon <boris.brezillon@bootlin.com>
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*
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* Helpers needed by the spi or spi-mem logic. Should not be used outside of
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* spi-mem.c and spi.c.
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*/
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#ifndef __LINUX_SPI_INTERNALS_H
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#define __LINUX_SPI_INTERNALS_H
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#include <linux/device.h>
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#include <linux/dma-direction.h>
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#include <linux/scatterlist.h>
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#include <linux/spi/spi.h>
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void spi_flush_queue(struct spi_controller *ctrl);
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#ifdef CONFIG_HAS_DMA
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int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
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struct sg_table *sgt, void *buf, size_t len,
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enum dma_data_direction dir);
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void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
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struct sg_table *sgt, enum dma_data_direction dir);
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#else /* !CONFIG_HAS_DMA */
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static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
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struct sg_table *sgt, void *buf, size_t len,
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enum dma_data_direction dir)
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{
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return -EINVAL;
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}
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static inline void spi_unmap_buf(struct spi_controller *ctlr,
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struct device *dev, struct sg_table *sgt,
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enum dma_data_direction dir)
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{
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}
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#endif /* CONFIG_HAS_DMA */
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#endif /* __LINUX_SPI_INTERNALS_H */
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