X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fpowerpc%2Fkernel%2Fdma_64.c;h=3a317cb0636a4f572790982648b65c077bb84b30;hb=7cfb5f9aaec6f0fc45ff323841e6d62f67e7ffad;hp=7b0e754383cf53e47affcf4a46acab9b5264761c;hpb=6bfe5c9d6f4dcaa998f67e691359cf7b1c4b443d;p=linux-2.6-omap-h63xx.git

diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c
index 7b0e754383c..3a317cb0636 100644
--- a/arch/powerpc/kernel/dma_64.c
+++ b/arch/powerpc/kernel/dma_64.c
@@ -31,8 +31,8 @@ static inline unsigned long device_to_mask(struct device *dev)
 static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
 				      dma_addr_t *dma_handle, gfp_t flag)
 {
-	return iommu_alloc_coherent(dev->archdata.dma_data, size, dma_handle,
-				    device_to_mask(dev), flag,
+	return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
+				    dma_handle, device_to_mask(dev), flag,
 				    dev->archdata.numa_node);
 }
 
@@ -52,7 +52,7 @@ static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr,
 				       size_t size,
 				       enum dma_data_direction direction)
 {
-	return iommu_map_single(dev->archdata.dma_data, vaddr, size,
+	return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
 			        device_to_mask(dev), direction);
 }
 
@@ -68,7 +68,7 @@ static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
 static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
 			    int nelems, enum dma_data_direction direction)
 {
-	return iommu_map_sg(dev->archdata.dma_data, sglist, nelems,
+	return iommu_map_sg(dev, sglist, nelems,
 			    device_to_mask(dev), direction);
 }
 
@@ -112,10 +112,16 @@ EXPORT_SYMBOL(dma_iommu_ops);
 /*
  * Generic direct DMA implementation
  *
- * This implementation supports a global offset that can be applied if
- * the address at which memory is visible to devices is not 0.
+ * This implementation supports a per-device offset that can be applied if
+ * the address at which memory is visible to devices is not 0. Platform code
+ * can set archdata.dma_data to an unsigned long holding the offset. By
+ * default the offset is zero.
  */
-unsigned long dma_direct_offset;
+
+static unsigned long get_dma_direct_offset(struct device *dev)
+{
+	return (unsigned long)dev->archdata.dma_data;
+}
 
 static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag)
@@ -124,13 +130,12 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 	void *ret;
 	int node = dev->archdata.numa_node;
 
-	/* TODO: Maybe use the numa node here too ? */
 	page = alloc_pages_node(node, flag, get_order(size));
 	if (page == NULL)
 		return NULL;
 	ret = page_address(page);
 	memset(ret, 0, size);
-	*dma_handle = virt_to_abs(ret) | dma_direct_offset;
+	*dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev);
 
 	return ret;
 }
@@ -145,7 +150,7 @@ static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr,
 					size_t size,
 					enum dma_data_direction direction)
 {
-	return virt_to_abs(ptr) | dma_direct_offset;
+	return virt_to_abs(ptr) + get_dma_direct_offset(dev);
 }
 
 static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr,
@@ -154,14 +159,14 @@ static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr,
 {
 }
 
-static int dma_direct_map_sg(struct device *dev, struct scatterlist *sg,
+static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 			     int nents, enum dma_data_direction direction)
 {
+	struct scatterlist *sg;
 	int i;
 
-	for (i = 0; i < nents; i++, sg++) {
-		sg->dma_address = (page_to_phys(sg->page) + sg->offset) |
-			dma_direct_offset;
+	for_each_sg(sgl, sg, nents, i) {
+		sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev);
 		sg->dma_length = sg->length;
 	}