linux/dma/mxs-dma.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _MXS_DMA_H_
0003 #define _MXS_DMA_H_
0004
0005 #include <linux/dmaengine.h>
0006
0007 #define MXS_DMA_CTRL_WAIT4END   BIT(31)
0008 #define MXS_DMA_CTRL_WAIT4RDY   BIT(30)
0009
0010 /*
0011  * The mxs dmaengine can do PIO transfers. We pass a pointer to the PIO words
0012  * in the second argument to dmaengine_prep_slave_sg when the direction is
0013  * set to DMA_TRANS_NONE. To make this clear and to prevent users from doing
0014  * the error prone casting we have this wrapper function
0015  */
0016 static inline struct dma_async_tx_descriptor *mxs_dmaengine_prep_pio(
0017         struct dma_chan *chan, u32 *pio, unsigned int npio,
0018         enum dma_transfer_direction dir, unsigned long flags)
0019 {
0020     return dmaengine_prep_slave_sg(chan, (struct scatterlist *)pio, npio,
0021                        dir, flags);
0022 }
0023
0024 #endif /* _MXS_DMA_H_ */