1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 2018 Exceet Electronics GmbH 4 * Copyright (C) 2018 Bootlin 5 * 6 * Author: Boris Brezillon <boris.brezillon@bootlin.com> 7 * 8 * Helpers needed by the spi or spi-mem logic. Should not be used outside of 9 * spi-mem.c and spi.c. 10 */ 11 12 #ifndef __LINUX_SPI_INTERNALS_H 13 #define __LINUX_SPI_INTERNALS_H 14 15 #include <linux/device.h> 16 #include <linux/dma-direction.h> 17 #include <linux/scatterlist.h> 18 #include <linux/spi/spi.h> 19 20 void spi_flush_queue(struct spi_controller *ctrl); 21 22 #ifdef CONFIG_HAS_DMA 23 int 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); 26 void 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 */ 29 static 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 36 static 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 43 static 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