[AVR32] Implement dma_{alloc,free}_writecombine()

Implement dma_alloc_writecombine() and its dma_free_writecombine()
counterpart. These will do basically the same thing as
dma_alloc_coherent() except that the virtual mapping will allow
write buffering, causing better performance for certain use cases
like frame buffers.

The same API is already available on ARM.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c
index b68d669f823d..099212d4567c 100644
--- a/arch/avr32/mm/dma-coherent.c
+++ b/arch/avr32/mm/dma-coherent.c
@@ -112,16 +112,21 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
-#if 0
 void *dma_alloc_writecombine(struct device *dev, size_t size,
                              dma_addr_t *handle, gfp_t gfp)
 {
         struct page *page;
+        dma_addr_t phys;
 
         page = __dma_alloc(dev, size, handle, gfp);
+        if (!page)
+                return NULL;
+
+        phys = page_to_phys(page);
+        *handle = phys;
 
         /* Now, map the page into P3 with write-combining turned on */
-        return __ioremap(page_to_phys(page), size, _PAGE_BUFFER);
+        return __ioremap(phys, size, _PAGE_BUFFER);
 }
 EXPORT_SYMBOL(dma_alloc_writecombine);
 
@@ -132,8 +137,7 @@ void dma_free_writecombine(struct device *dev, size_t size,
 
         iounmap(cpu_addr);
 
-        page = bus_to_page(handle);
+        page = phys_to_page(handle);
         __dma_free(dev, size, page, handle);
 }
 EXPORT_SYMBOL(dma_free_writecombine);
-#endif