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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2017-12-04 16:09:01 +0100
committerRich Felker <dalias@libc.org>2018-04-12 19:47:53 -0400
commitce88313069c36eef80f21fd7403f16620ecd21a2 (patch)
tree6d0733fa5f58aead4d68ffbdd846038cbd306ff1 /arch/sh/kernel
parentbc05aa6e13a717e1abff6f863f7ba82b14556df4 (diff)
arch/sh: make the DMA mapping operations observe dev->dma_pfn_offset
Some devices may have a non-zero DMA offset, i.e an offset between the DMA address and the physical address. Such an offset can be encoded into the dma_pfn_offset field of "struct device", but the SuperH implementation of the DMA mapping API does not observe this information. This commit fixes that by ensuring the DMA address is properly calculated depending on this DMA offset. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Rich Felker <dalias@libc.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/dma-nommu.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/sh/kernel/dma-nommu.c b/arch/sh/kernel/dma-nommu.c
index 62b485107eae..178457d7620c 100644
--- a/arch/sh/kernel/dma-nommu.c
+++ b/arch/sh/kernel/dma-nommu.c
@@ -16,7 +16,8 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
unsigned long attrs)
{
- dma_addr_t addr = page_to_phys(page) + offset;
+ dma_addr_t addr = page_to_phys(page) + offset
+ - PFN_PHYS(dev->dma_pfn_offset);
WARN_ON(size == 0);
@@ -36,12 +37,14 @@ static int nommu_map_sg(struct device *dev, struct scatterlist *sg,
WARN_ON(nents == 0 || sg[0].length == 0);
for_each_sg(sg, s, nents, i) {
+ dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset);
+
BUG_ON(!sg_page(s));
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
sh_sync_dma_for_device(sg_virt(s), s->length, dir);
- s->dma_address = sg_phys(s);
+ s->dma_address = sg_phys(s) - offset;
s->dma_length = s->length;
}