[PATCH 1/8] mips: implement dma_mmap_coherent()

[Takashi Iwai <tiwai@suse.de>]

A lazy version of dma_mmap_coherent() implementation for MIPS.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 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