root/include/linux/dma/mxs-dma.h

INCLUDED FROM

DEFINITIONS

1. mxs_dmaengine_prep_pio

   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  */
  16 static 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_ */