mirror of
https://github.com/torvalds/linux.git
synced 2024-12-01 00:21:32 +00:00
988f259b46
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>
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2018 Exceet Electronics GmbH
|
|
* Copyright (C) 2018 Bootlin
|
|
*
|
|
* Author: Boris Brezillon <boris.brezillon@bootlin.com>
|
|
*
|
|
* Helpers needed by the spi or spi-mem logic. Should not be used outside of
|
|
* spi-mem.c and spi.c.
|
|
*/
|
|
|
|
#ifndef __LINUX_SPI_INTERNALS_H
|
|
#define __LINUX_SPI_INTERNALS_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-direction.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
void spi_flush_queue(struct spi_controller *ctrl);
|
|
|
|
#ifdef CONFIG_HAS_DMA
|
|
int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
|
|
struct sg_table *sgt, void *buf, size_t len,
|
|
enum dma_data_direction dir);
|
|
void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
|
|
struct sg_table *sgt, enum dma_data_direction dir);
|
|
#else /* !CONFIG_HAS_DMA */
|
|
static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
|
|
struct sg_table *sgt, void *buf, size_t len,
|
|
enum dma_data_direction dir)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline void spi_unmap_buf(struct spi_controller *ctlr,
|
|
struct device *dev, struct sg_table *sgt,
|
|
enum dma_data_direction dir)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HAS_DMA */
|
|
|
|
#endif /* __LINUX_SPI_INTERNALS_H */
|