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_ */ 25