diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/fsldma.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 5dfedf326573..cbd5b9684521 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -406,6 +406,32 @@ static void fsl_dma_free_chan_resources(struct dma_chan *chan) dma_pool_destroy(fsl_chan->desc_pool); } +static struct dma_async_tx_descriptor * +fsl_dma_prep_interrupt(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan; + struct fsl_desc_sw *new; + + if (!chan) + return NULL; + + fsl_chan = to_fsl_chan(chan); + + new = fsl_dma_alloc_descriptor(fsl_chan); + if (!new) { + dev_err(fsl_chan->dev, "No free memory for link descriptor\n"); + return NULL; + } + + new->async_tx.cookie = -EBUSY; + new->async_tx.ack = 0; + + /* Set End-of-link to the last link descriptor of new list*/ + set_ld_eol(fsl_chan, new); + + return &new->async_tx; +} + static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy( struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) @@ -1020,6 +1046,7 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev, dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; + fdev->common.device_prep_dma_interrupt = fsl_dma_prep_interrupt; fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; fdev->common.device_is_tx_complete = fsl_dma_is_complete; fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; |