ARM: implement dma mapping functions

Implement basic dma mapping functions. For now just assume every address
is valid for dma mapping.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
index fc71cf03cd..6ccd5893b4 100644
--- a/arch/arm/cpu/mmu.c
+++ b/arch/arm/cpu/mmu.c
@@ -598,3 +598,19 @@ void dma_sync_single_for_device(dma_addr_t address, size_t size,
 			outer_cache.clean_range(address, address + size);
 	}
 }
+
+dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size,
+			  enum dma_data_direction dir)
+{
+	unsigned long addr = (unsigned long)ptr;
+
+	dma_sync_single_for_device(addr, size, dir);
+
+	return addr;
+}
+
+void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size,
+		      enum dma_data_direction dir)
+{
+	dma_sync_single_for_cpu(addr, size, dir);
+}