diff options
| -rw-r--r-- | drivers/dma/edma.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 5d9f57f..18c833f 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -70,12 +70,34 @@ struct edma_desc { int cyclic; int absync; int pset_nr; + struct edma_chan *echan; int processed; + + /* + * The following 4 elements are used for residue accounting. + * + * - processed_stat: the number of SG elements we have traversed + * so far to cover accounting. This is updated directly to processed + * during edma_callback and is always <= processed, because processed + * refers to the number of pending transfer (programmed to EDMA + * controller), where as processed_stat tracks number of transfers + * accounted for so far. + * + * - residue: The amount of bytes we have left to transfer for this desc + * + * - residue_stat: The residue in bytes of data we have covered + * so far for accounting. This is updated directly to residue + * during callbacks to keep it current. + * + * - sg_len: Tracks the length of the current intermediate transfer, + * this is required to update the residue during intermediate transfer + * completion callback. + */ int processed_stat; - u32 residue; u32 sg_len; + u32 residue; u32 residue_stat; - struct edma_chan *echan; + struct edma_pset pset[0]; }; |