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