diff options
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index e1c03339918f..328e3aca7f51 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -61,6 +61,8 @@ enum dma_transaction_type { DMA_SLAVE, DMA_CYCLIC, DMA_INTERLEAVE, + DMA_REPEAT, + DMA_LOAD_EOT, /* last transaction type for creation of the capabilities mask */ DMA_TX_TYPE_END, }; @@ -176,6 +178,16 @@ struct dma_interleaved_template { * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is command * data and the descriptor should be in different format from normal * data descriptors. + * @DMA_PREP_REPEAT: tell the driver that the transaction shall be automatically + * repeated when it ends until a transaction is issued on the same channel + * with the DMA_PREP_LOAD_EOT flag set. This flag is only applicable to + * interleaved transactions and is ignored for all other transaction types. + * @DMA_PREP_LOAD_EOT: tell the driver that the transaction shall replace any + * active repeated (as indicated by DMA_PREP_REPEAT) transaction when the + * repeated transaction ends. Not setting this flag when the previously queued + * transaction is marked with DMA_PREP_REPEAT will cause the new transaction + * to never be processed and stay in the issued queue forever. The flag is + * ignored if the previous transaction is not a repeated transaction. */ enum dma_ctrl_flags { DMA_PREP_INTERRUPT = (1 << 0), @@ -186,6 +198,8 @@ enum dma_ctrl_flags { DMA_PREP_FENCE = (1 << 5), DMA_CTRL_REUSE = (1 << 6), DMA_PREP_CMD = (1 << 7), + DMA_PREP_REPEAT = (1 << 8), + DMA_PREP_LOAD_EOT = (1 << 9), }; /** @@ -980,6 +994,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma( { if (!chan || !chan->device || !chan->device->device_prep_interleaved_dma) return NULL; + if (flags & DMA_PREP_REPEAT && + !test_bit(DMA_REPEAT, chan->device->cap_mask.bits)) + return NULL; return chan->device->device_prep_interleaved_dma(chan, xt, flags); } |