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1/* SPDX-License-Identifier: GPL-2.0+ */2/*3 * Copyright (C) 2018 Exceet Electronics GmbH4 * Copyright (C) 2018 Bootlin5 *6 * Author: Boris Brezillon <boris.brezillon@bootlin.com>7 *8 * Helpers needed by the spi or spi-mem logic. Should not be used outside of9 * spi-mem.c and spi.c.10 */11 12#ifndef __LINUX_SPI_INTERNALS_H13#define __LINUX_SPI_INTERNALS_H14 15#include <linux/device.h>16#include <linux/dma-direction.h>17#include <linux/scatterlist.h>18#include <linux/spi/spi.h>19 20void spi_flush_queue(struct spi_controller *ctrl);21 22#ifdef CONFIG_HAS_DMA23int spi_map_buf(struct spi_controller *ctlr, struct device *dev,24 struct sg_table *sgt, void *buf, size_t len,25 enum dma_data_direction dir);26void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,27 struct sg_table *sgt, enum dma_data_direction dir);28#else /* !CONFIG_HAS_DMA */29static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,30 struct sg_table *sgt, void *buf, size_t len,31 enum dma_data_direction dir)32{33 return -EINVAL;34}35 36static inline void spi_unmap_buf(struct spi_controller *ctlr,37 struct device *dev, struct sg_table *sgt,38 enum dma_data_direction dir)39{40}41#endif /* CONFIG_HAS_DMA */42 43static inline bool spi_xfer_is_dma_mapped(struct spi_controller *ctlr,44 struct spi_device *spi,45 struct spi_transfer *xfer)46{47 return ctlr->can_dma && ctlr->can_dma(ctlr, spi, xfer) &&48 (xfer->tx_sg_mapped || xfer->rx_sg_mapped);49}50 51#endif /* __LINUX_SPI_INTERNALS_H */52