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fsldma: Add device_prep_dma_interrupt support to fsldma.c 

This is a bug that I assigned DMA_INTERRUPT capability to fsldma
but missing device_prep_dma_interrupt function. For a bug in
dmaengine.c the driver passed BUG_ON() checking. The patch fixes it.

Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Zhang Wei 2008-03-13 17:45:28 -07:00 committed by Dan Williams
parent 9b941c6660
commit 2187c269ad
1 changed files with 27 additions and 0 deletions
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27
drivers/dma/fsldma.c
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@ -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;