| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _MXS_DMA_H_ |
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| 3 | #define _MXS_DMA_H_ |
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| 4 | |
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| 5 | #include <linux/dmaengine.h> |
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| 6 | |
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| 7 | #define MXS_DMA_CTRL_WAIT4END BIT(31) |
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| 8 | #define MXS_DMA_CTRL_WAIT4RDY BIT(30) |
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| 9 | |
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| 10 | /* |
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| 11 | * The mxs dmaengine can do PIO transfers. We pass a pointer to the PIO words |
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| 12 | * in the second argument to dmaengine_prep_slave_sg when the direction is |
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| 13 | * set to DMA_TRANS_NONE. To make this clear and to prevent users from doing |
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| 14 | * the error prone casting we have this wrapper function |
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| 15 | */ |
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| 16 | static inline struct dma_async_tx_descriptor *mxs_dmaengine_prep_pio( |
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| 17 | struct dma_chan *chan, u32 *pio, unsigned int npio, |
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| 18 | enum dma_transfer_direction dir, unsigned long flags) |
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| 19 | { |
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| 20 | return dmaengine_prep_slave_sg(chan, sgl: (struct scatterlist *)pio, sg_len: npio, |
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| 21 | dir, flags); |
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| 22 | } |
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| 23 | |
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| 24 | #endif /* _MXS_DMA_H_ */ |
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| 25 | |
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