[PATCH 1/3] ppc: Add dma_mmap_coherent() for PPC32

[Takashi Iwai]

A very lazy version of dma_mmap_coherent() implementation for ppc32.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 include/asm-powerpc/dma-mapping.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index bbefb69..a6a9675 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -306,6 +306,24 @@ static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 	/* We don't do anything here. */
 }
 
+/*
+ * A helper to mmap the pages allocated via dma_alloc_coherent()
+ */
+static inline 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;
+#ifdef CONFIG_NOT_COHERENT_CACHE
+	/* I'm too lazy and can't stop using bus_to_virt() here... */
+	cpu_addr = bus_to_virt(handle);
+#endif
+	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);
+}
 #endif /* CONFIG_PPC64 */
 
 static inline void dma_sync_single_for_cpu(struct device *dev,
-- 
1.5.4.5