2019-05-21 15:06:41 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MXS_DMA_H_
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#define _MXS_DMA_H_
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#include <linux/dmaengine.h>
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2019-05-21 15:06:42 +08:00
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#define MXS_DMA_CTRL_WAIT4END BIT(31)
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2019-05-21 15:06:43 +08:00
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#define MXS_DMA_CTRL_WAIT4RDY BIT(30)
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2019-05-21 15:06:42 +08:00
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2019-05-21 15:06:41 +08:00
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/*
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* The mxs dmaengine can do PIO transfers. We pass a pointer to the PIO words
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* in the second argument to dmaengine_prep_slave_sg when the direction is
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* set to DMA_TRANS_NONE. To make this clear and to prevent users from doing
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* the error prone casting we have this wrapper function
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*/
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static inline struct dma_async_tx_descriptor *mxs_dmaengine_prep_pio(
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struct dma_chan *chan, u32 *pio, unsigned int npio,
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enum dma_transfer_direction dir, unsigned long flags)
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{
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return dmaengine_prep_slave_sg(chan, (struct scatterlist *)pio, npio,
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dir, flags);
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}
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#endif /* _MXS_DMA_H_ */
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