diff options
Diffstat (limited to 'arch/powerpc/kernel/dma_64.c')
| -rw-r--r-- | arch/powerpc/kernel/dma_64.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c index 14206e3f081..84239076a5b 100644 --- a/arch/powerpc/kernel/dma_64.c +++ b/arch/powerpc/kernel/dma_64.c @@ -112,10 +112,16 @@ EXPORT_SYMBOL(dma_iommu_ops); /* * Generic direct DMA implementation * - * This implementation supports a global offset that can be applied if - * the address at which memory is visible to devices is not 0. + * This implementation supports a per-device offset that can be applied if + * the address at which memory is visible to devices is not 0. Platform code + * can set archdata.dma_data to an unsigned long holding the offset. By + * default the offset is zero. */ -unsigned long dma_direct_offset; + +static unsigned long get_dma_direct_offset(struct device *dev) +{ + return (unsigned long)dev->archdata.dma_data; +} static void *dma_direct_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) @@ -124,13 +130,12 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size, void *ret; int node = dev->archdata.numa_node; - /* TODO: Maybe use the numa node here too ? */ page = alloc_pages_node(node, flag, get_order(size)); if (page == NULL) return NULL; ret = page_address(page); memset(ret, 0, size); - *dma_handle = virt_to_abs(ret) | dma_direct_offset; + *dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev); return ret; } @@ -145,7 +150,7 @@ static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { - return virt_to_abs(ptr) | dma_direct_offset; + return virt_to_abs(ptr) + get_dma_direct_offset(dev); } static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr, @@ -161,7 +166,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int i; for_each_sg(sgl, sg, nents, i) { - sg->dma_address = sg_phys(sg) | dma_direct_offset; + sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev); sg->dma_length = sg->length; } |