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nds32: implement the unmap_sg DMA operation

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This matches the implementation of the more commonly used unmap_single
routines and the sync_sg_for_cpu method which should provide equivalent
cache maintainance.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Greentime Hu <greentime@andestech.com>
Tested-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Christoph Hellwig 2018-05-19 09:22:05 +02:00
parent 4ac1c68e36
commit f860122c51
1 changed files with 6 additions and 0 deletions
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6
arch/nds32/kernel/dma.c
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@ -458,6 +458,12 @@ static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nhwentries, enum dma_data_direction dir,
unsigned long attrs)
{
int i;
for (i = 0; i < nhwentries; i++, sg++) {
nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
sg->length, dir);
}
}
struct dma_map_ops nds32_dma_ops = {