diff options
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index c61d4ca..32cd84b 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -67,10 +67,11 @@ enum dma_transaction_type { DMA_PRIVATE, DMA_ASYNC_TX, DMA_SLAVE, + DMA_CYCLIC, }; /* last transaction type for creation of the capabilities mask */ -#define DMA_TX_TYPE_END (DMA_SLAVE + 1) +#define DMA_TX_TYPE_END (DMA_CYCLIC + 1) /** @@ -422,6 +423,9 @@ struct dma_tx_state { * @device_prep_dma_memset: prepares a memset operation * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation + * @device_prep_dma_cyclic: prepare a cyclic dma operation suitable for audio. + * The function takes a buffer of size buf_len. The callback function will + * be called after period_len bytes have been transferred. * @device_control: manipulate all pending operations on a channel, returns * zero or error code * @device_tx_status: poll for transaction completion, the optional @@ -478,6 +482,9 @@ struct dma_device { struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_data_direction direction, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_cyclic)( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_data_direction direction); int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg); |