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>

arch/blackfin/include/asm/dma-mapping.h

@@ -7,9 +7,9 @@
 #ifndef _BLACKFIN_DMA_MAPPING_H
 #define _BLACKFIN_DMA_MAPPING_H
 
-#include <asm/scatterlist.h>
+#include <asm/cacheflush.h>
+struct scatterlist;
 
-void dma_alloc_init(unsigned long start, unsigned long end);
 void *dma_alloc_coherent(struct device *dev, size_t size,
 			 dma_addr_t *dma_handle, gfp_t gfp);
 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
@@ -20,13 +20,51 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  */
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+#define dma_supported(d, m)         (1)
+#define dma_get_cache_alignment()   (32)
+#define dma_is_consistent(d, h)     (1)
 
-static inline
-int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+static inline int
+dma_set_mask(struct device *dev, u64 dma_mask)
 {
+	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+		return -EIO;
+
+	*dev->dma_mask = dma_mask;
+
 	return 0;
 }
 
+static inline int
+dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+extern void
+__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
+static inline void
+_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
+{
+	if (!__builtin_constant_p(dir)) {
+		__dma_sync(addr, size, dir);
+		return;
+	}
+
+	switch (dir) {
+	case DMA_NONE:
+		BUG();
+	case DMA_TO_DEVICE:		/* writeback only */
+		flush_dcache_range(addr, addr + size);
+		break;
+	case DMA_FROM_DEVICE: /* invalidate only */
+	case DMA_BIDIRECTIONAL: /* flush and invalidate */
+		/* Blackfin has no dedicated invalidate (it includes a flush) */
+		invalidate_dcache_range(addr, addr + size);
+		break;
+	}
+}
+
 /*
  * Map a single buffer of the indicated size for DMA in streaming mode.
  * The 32-bit bus address to use is returned.
@@ -34,8 +72,13 @@ int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  * Once the device is given the dma address, the device owns this memory
  * until either pci_unmap_single or pci_dma_sync_single is performed.
  */
-extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
-				 enum dma_data_direction direction);
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *ptr, size_t size,
+	       enum dma_data_direction dir)
+{
+	_dma_sync((dma_addr_t)ptr, size, dir);
+	return (dma_addr_t) ptr;
+}
 
 static inline dma_addr_t
 dma_map_page(struct device *dev, struct page *page,
@@ -53,8 +96,12 @@ dma_map_page(struct device *dev, struct page *page,
  * After this call, reads by the cpu to the buffer are guarenteed to see
  * whatever the device wrote there.
  */
-extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
-			  enum dma_data_direction direction);
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+		 enum dma_data_direction dir)
+{
+	BUG_ON(!valid_dma_direction(dir));
+}
 
 static inline void
 dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
@@ -80,38 +127,66 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
  * the same here.
  */
 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-		      enum dma_data_direction direction);
+		      enum dma_data_direction dir);
 
 /*
  * Unmap a set of streaming mode DMA translations.
  * Again, cpu read rules concerning calls here are the same as for
  * pci_unmap_single() above.
  */
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-		      int nhwentries, enum dma_data_direction direction);
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+	     int nhwentries, enum dma_data_direction dir)
+{
+	BUG_ON(!valid_dma_direction(dir));
+}
 
-static inline void dma_sync_single_for_cpu(struct device *dev,
-					dma_addr_t handle, size_t size,
-					enum dma_data_direction dir)
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
+			      unsigned long offset, size_t size,
+			      enum dma_data_direction dir)
 {
+	BUG_ON(!valid_dma_direction(dir));
 }
 
-static inline void dma_sync_single_for_device(struct device *dev,
-					dma_addr_t handle, size_t size,
-					enum dma_data_direction dir)
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
+				 unsigned long offset, size_t size,
+				 enum dma_data_direction dir)
 {
+	_dma_sync(handle + offset, size, dir);
 }
 
-static inline void dma_sync_sg_for_cpu(struct device *dev,
-					struct scatterlist *sg,
-					int nents, enum dma_data_direction dir)
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
+			enum dma_data_direction dir)
 {
+	dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
 }
 
-static inline void dma_sync_sg_for_device(struct device *dev,
-					struct scatterlist *sg,
-					int nents, enum dma_data_direction dir)
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
+			   enum dma_data_direction dir)
+{
+	dma_sync_single_range_for_device(dev, handle, 0, size, dir);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
+		    enum dma_data_direction dir)
+{
+	BUG_ON(!valid_dma_direction(dir));
+}
+
+extern void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+		       int nents, enum dma_data_direction dir);
+
+static inline void
+dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+	       enum dma_data_direction dir)
 {
+	_dma_sync((dma_addr_t)vaddr, size, dir);
 }
 
 #endif				/* _BLACKFIN_DMA_MAPPING_H */

arch/blackfin/include/asm/dma.h

@@ -13,8 +13,7 @@
 #include <asm/atomic.h>
 #include <asm/blackfin.h>
 #include <asm/page.h>
-
-#define MAX_DMA_ADDRESS PAGE_OFFSET
+#include <asm-generic/dma.h>
 
 /* DMA_CONFIG Masks */
 #define DMAEN			0x0001	/* DMA Channel Enable */
@@ -257,8 +256,6 @@ static inline void enable_dma(unsigned int channel)
 	dma_ch[channel].regs->curr_y_count = 0;
 	dma_ch[channel].regs->cfg |= DMAEN;
 }
-void free_dma(unsigned int channel);
-int request_dma(unsigned int channel, const char *device_id);
 int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);
 
 static inline void dma_disable_irq(unsigned int channel)

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);