Blackfin: dma-mapping.h: flesh out missing DMA mapping functions

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 17 insertions, 37 deletions

diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 755a0f4b61ae..e937f323d82c 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c
@@ -7,17 +7,11 @@
  */
 
 #include <linux/types.h>
-#include <linux/mm.h>
+#include <linux/gfp.h>
 #include <linux/string.h>
-#include <linux/bootmem.h>
 #include <linux/spinlock.h>
-#include <linux/device.h>
 #include <linux/dma-mapping.h>
-#include <linux/io.h>
 #include <linux/scatterlist.h>
-#include <asm/cacheflush.h>
-#include <asm/bfin-global.h>
-#include <asm/sections.h>
 
 static spinlock_t dma_page_lock;
 static unsigned long *dma_page;
@@ -26,7 +20,7 @@ static unsigned long dma_base;
 static unsigned long dma_size;
 static unsigned int dma_initialized;
 
-void dma_alloc_init(unsigned long start, unsigned long end)
+static void dma_alloc_init(unsigned long start, unsigned long end)
 {
         spin_lock_init(&dma_page_lock);
         dma_initialized = 0;
@@ -93,7 +87,7 @@ static void __free_dma_pages(unsigned long addr, unsigned int pages)
 }
 
 void *dma_alloc_coherent(struct device *dev, size_t size,
-                         dma_addr_t * dma_handle, gfp_t gfp)
+                         dma_addr_t *dma_handle, gfp_t gfp)
 {
         void *ret;
 
@@ -117,21 +111,14 @@ dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 EXPORT_SYMBOL(dma_free_coherent);
 
 /*
- * Dummy functions defined for some existing drivers
+ * Streaming DMA mappings
  */
-
-dma_addr_t
-dma_map_single(struct device *dev, void *ptr, size_t size,
-               enum dma_data_direction direction)
+void __dma_sync(dma_addr_t addr, size_t size,
+                enum dma_data_direction dir)
 {
-        BUG_ON(direction == DMA_NONE);
-
-        invalidate_dcache_range((unsigned long)ptr,
-                        (unsigned long)ptr + size);
-
-        return (dma_addr_t) ptr;
+        _dma_sync(addr, size, dir);
 }
-EXPORT_SYMBOL(dma_map_single);
+EXPORT_SYMBOL(__dma_sync);
 
 int
 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
@@ -139,30 +126,23 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 {
         int i;
 
-        BUG_ON(direction == DMA_NONE);
-
         for (i = 0; i < nents; i++, sg++) {
                 sg->dma_address = (dma_addr_t) sg_virt(sg);
-
-                invalidate_dcache_range(sg_dma_address(sg),
-                                        sg_dma_address(sg) +
-                                        sg_dma_len(sg));
+                __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
         }
 
         return nents;
 }
 EXPORT_SYMBOL(dma_map_sg);
 
-void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
-                enum dma_data_direction direction)
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+                            int nelems, enum dma_data_direction direction)
 {
-        BUG_ON(direction == DMA_NONE);
-}
-EXPORT_SYMBOL(dma_unmap_single);
+        int i;
 
-void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-                int nhwentries, enum dma_data_direction direction)
-{
-        BUG_ON(direction == DMA_NONE);
+        for (i = 0; i < nelems; i++, sg++) {
+                sg->dma_address = (dma_addr_t) sg_virt(sg);
+                __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
+        }
 }
-EXPORT_SYMBOL(dma_unmap_sg);
+EXPORT_SYMBOL(dma_sync_sg_for_device);