A lazy version of dma_mmap_coherent() implementation for MIPS.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
arch/mips/include/asm/dma-mapping.h | 4 ++++
arch/mips/mm/dma-default.c | 13 +++++++++++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index d16afdd..475fad3 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -73,6 +73,10 @@ extern int dma_is_consistent(struct device *dev, dma_addr_t dma_addr);
extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
+#define ARCH_HAS_DMA_MMAP_COHERENT
+extern int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle, size_t size);
+
#if 0
#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index 7e48e76..6d71a2b 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -367,3 +367,16 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
}
EXPORT_SYMBOL(dma_cache_sync);
+
+int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle, size_t size)
+{
+ struct page *pg;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ cpu_addr = (void *)dma_addr_to_virt(handle);
+ pg = virt_to_page(cpu_addr);
+ return remap_pfn_range(vma, vma->vm_start,
+ page_to_pfn(pg) + vma->vm_pgoff,
+ size, vma->vm_page_prot);
+}
+EXPORT_SYMBOL(dma_mmap_coherent);
--
1.6.3.2
--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
