A lazy version of dma_mmap_coherent() implementation for SH architecture.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
arch/sh/include/asm/dma-mapping.h | 4 ++++
arch/sh/mm/consistent.c | 13 +++++++++++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
index 69d56dd..120fe1a 100644
--- a/arch/sh/include/asm/dma-mapping.h
+++ b/arch/sh/include/asm/dma-mapping.h
@@ -28,6 +28,10 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
void dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
+#define ARCH_HAS_DMA_MMAP_COHERENT
+int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle, size_t size);
+
void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir);
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index e098ec1..f45aaff 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -107,6 +107,19 @@ 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_writecombine(vma->vm_page_prot);
+ cpu_addr = (void *)phys_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);
+
static int __init memchunk_setup(char *str)
{
return 1; /* accept anything that begins with "memchunk." */
--
1.6.3.2
--
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