| 1 |
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| 2 | |
| 3 | * Copyright (C) 2018 Exceet Electronics GmbH
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| 4 | * Copyright (C) 2018 Bootlin
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| 5 | *
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| 6 | * Author: Boris Brezillon <[email protected]>
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| 7 | *
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| 8 | * Helpers needed by the SPI core and its tests. Should not be used outside
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| 9 | * drivers/spi/.
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| 10 |
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| 11 |
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| 12 | #ifndef __LINUX_SPI_INTERNALS_H
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| 13 | #define __LINUX_SPI_INTERNALS_H
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| 14 |
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| 15 | #include <linux/device.h>
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| 16 | #include <linux/dma-direction.h>
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| 17 | #include <linux/scatterlist.h>
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| 18 | #include <linux/spi/spi.h>
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| 19 |
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| 20 | void spi_flush_queue(struct spi_controller *ctrl);
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| 21 |
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| 22 | #ifdef CONFIG_HAS_DMA
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| 23 | #if IS_ENABLED(CONFIG_KUNIT)
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| 24 | int __spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg);
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| 25 | int __spi_unmap_msg(struct spi_controller *ctlr, struct spi_message *msg);
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| 26 | #endif
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| 27 |
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| 28 | int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
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| 29 | struct sg_table *sgt, void *buf, size_t len,
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| 30 | enum dma_data_direction dir);
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| 31 | void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
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| 32 | struct sg_table *sgt, enum dma_data_direction dir);
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| 33 | #else
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| 34 | static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
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| 35 | struct sg_table *sgt, void *buf, size_t len,
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| 36 | enum dma_data_direction dir)
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| 37 | {
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| 38 | return -EINVAL;
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| 39 | }
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| 40 |
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| 41 | static inline void spi_unmap_buf(struct spi_controller *ctlr,
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| 42 | struct device *dev, struct sg_table *sgt,
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| 43 | enum dma_data_direction dir)
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| 44 | {
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| 45 | }
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| 46 | #endif
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| 47 |
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| 48 | static inline bool spi_xfer_is_dma_mapped(struct spi_controller *ctlr,
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| 49 | struct spi_device *spi,
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| 50 | struct spi_transfer *xfer)
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| 51 | {
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| 52 | return ctlr->can_dma && ctlr->can_dma(ctlr, spi, xfer) &&
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| 53 | (xfer->tx_sg_mapped || xfer->rx_sg_mapped);
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| 54 | }
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| 55 |
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| 56 | #endif
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