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arch/sh: make the DMA mapping operations observe dev->dma_pfn_offset

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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>
This commit is contained in:
Thomas Petazzoni
2017-12-04 16:09:01 +01:00
committed by Rich Felker
parent bc05aa6e13
commit ce88313069
2 changed files with 7 additions and 4 deletions
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4
arch/sh/mm/consistent.c
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@@ -59,7 +59,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
*dma_handle = virt_to_phys(ret);
*dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset);
return ret_nocache;
}
@@ -69,7 +69,7 @@ void dma_generic_free_coherent(struct device *dev, size_t size,
unsigned long attrs)
{
int order = get_order(size);
unsigned long pfn = dma_handle >> PAGE_SHIFT;
unsigned long pfn = (dma_handle >> PAGE_SHIFT) + dev->dma_pfn_offset;
int k;
for (k = 0; k < (1 << order); k++)