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dma: add support for scatterlist to scatterlist copy 

This adds support for scatterlist to scatterlist DMA transfers. A
similar interface is exposed by the fsldma driver (through the DMA_SLAVE
API) and by the ste_dma40 driver (through an exported function).

This patch paves the way for making this type of copy operation a part
of the generic DMAEngine API. Futher patches will add support in
individual drivers.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ira Snyder 2010-09-30 11:46:44 +00:00 committed by Dan Williams
parent cc60f8878e
commit a86ee03ce6
2 changed files with 8 additions and 0 deletions
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2
drivers/dma/dmaengine.c
View File

@ -690,6 +690,8 @@ int dma_async_device_register(struct dma_device *device)
!device->device_prep_dma_memset);
BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) &&
!device->device_prep_dma_interrupt);
BUG_ON(dma_has_cap(DMA_SG, device->cap_mask) &&
!device->device_prep_dma_sg);
BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
!device->device_prep_slave_sg);
BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&

6
include/linux/dmaengine.h
View File

@ -64,6 +64,7 @@ enum dma_transaction_type {
DMA_PQ_VAL,
DMA_MEMSET,
DMA_INTERRUPT,
DMA_SG,
DMA_PRIVATE,
DMA_ASYNC_TX,
DMA_SLAVE,
@ -473,6 +474,11 @@ struct dma_device {
unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
struct dma_chan *chan, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_sg)(
struct dma_chan *chan,
struct scatterlist *dst_sg, unsigned int dst_nents,
struct scatterlist *src_sg, unsigned int src_nents,
unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_slave_sg)(
struct dma_chan *chan, struct scatterlist *sgl,