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