[PATCH 07/16] nios2: convert to dma_map_ops

[Christoph Hellwig <hch@lst.de>]

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/nios2/Kconfig                   |   1 +
 arch/nios2/include/asm/dma-mapping.h | 123 ++---------------------------
 arch/nios2/mm/dma-mapping.c          | 147 +++++++++++++++++++----------------
 3 files changed, 85 insertions(+), 186 deletions(-)

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 4375554..4b2504d 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -16,6 +16,7 @@ config NIOS2
 	select SOC_BUS
 	select SPARSE_IRQ
 	select USB_ARCH_HAS_HCD if USB_SUPPORT
+	select HAVE_DMA_ATTRS
 
 config GENERIC_CSUM
 	def_bool y
diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h
index b556723..bec8ac8 100644
--- a/arch/nios2/include/asm/dma-mapping.h
+++ b/arch/nios2/include/asm/dma-mapping.h
@@ -10,131 +10,20 @@
 #ifndef _ASM_NIOS2_DMA_MAPPING_H
 #define _ASM_NIOS2_DMA_MAPPING_H
 
-#include <linux/scatterlist.h>
-#include <linux/cache.h>
-#include <asm/cacheflush.h>
+extern struct dma_map_ops nios2_dma_ops;
 
-static inline void __dma_sync_for_device(void *vaddr, size_t size,
-			      enum dma_data_direction direction)
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 {
-	switch (direction) {
-	case DMA_FROM_DEVICE:
-		invalidate_dcache_range((unsigned long)vaddr,
-			(unsigned long)(vaddr + size));
-		break;
-	case DMA_TO_DEVICE:
-		/*
-		 * We just need to flush the caches here , but Nios2 flush
-		 * instruction will do both writeback and invalidate.
-		 */
-	case DMA_BIDIRECTIONAL: /* flush and invalidate */
-		flush_dcache_range((unsigned long)vaddr,
-			(unsigned long)(vaddr + size));
-		break;
-	default:
-		BUG();
-	}
-}
-
-static inline void __dma_sync_for_cpu(void *vaddr, size_t size,
-			      enum dma_data_direction direction)
-{
-	switch (direction) {
-	case DMA_BIDIRECTIONAL:
-	case DMA_FROM_DEVICE:
-		invalidate_dcache_range((unsigned long)vaddr,
-			(unsigned long)(vaddr + size));
-		break;
-	case DMA_TO_DEVICE:
-		break;
-	default:
-		BUG();
-	}
-}
-
-#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)
-
-void *dma_alloc_coherent(struct device *dev, size_t size,
-			   dma_addr_t *dma_handle, gfp_t flag);
-
-void dma_free_coherent(struct device *dev, size_t size,
-			 void *vaddr, dma_addr_t dma_handle);
-
-static inline dma_addr_t dma_map_single(struct device *dev, void *ptr,
-					size_t size,
-					enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-	__dma_sync_for_device(ptr, size, direction);
-	return virt_to_phys(ptr);
-}
-
-static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-				size_t size, enum dma_data_direction direction)
-{
-}
-
-extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-	enum dma_data_direction direction);
-extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
-	unsigned long offset, size_t size, enum dma_data_direction direction);
-extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-	size_t size, enum dma_data_direction direction);
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-	int nhwentries, enum dma_data_direction direction);
-extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-	size_t size, enum dma_data_direction direction);
-extern void dma_sync_single_for_device(struct device *dev,
-	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction);
-extern void dma_sync_single_range_for_cpu(struct device *dev,
-	dma_addr_t dma_handle, unsigned long offset, size_t size,
-	enum dma_data_direction direction);
-extern void dma_sync_single_range_for_device(struct device *dev,
-	dma_addr_t dma_handle, unsigned long offset, size_t size,
-	enum dma_data_direction direction);
-extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
-	int nelems, enum dma_data_direction direction);
-extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
-	int nelems, enum dma_data_direction direction);
-
-static inline int dma_supported(struct device *dev, u64 mask)
-{
-	return 1;
-}
-
-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
-	if (!dev->dma_mask || !dma_supported(dev, mask))
-		return -EIO;
-
-	*dev->dma_mask = mask;
-
-	return 0;
-}
-
-static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-	return 0;
+	return &nios2_dma_ops;
 }
 
 /*
-* dma_alloc_noncoherent() returns non-cacheable memory, so there's no need to
-* do any flushing here.
-*/
+ * dma_alloc_noncoherent() returns non-cacheable memory, so there's no need to
+ * do any flushing here.
+ */
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 				  enum dma_data_direction direction)
 {
 }
 
-/* drivers/base/dma-mapping.c */
-extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
-		void *cpu_addr, dma_addr_t dma_addr, size_t size);
-extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
-		void *cpu_addr, dma_addr_t dma_addr,
-		size_t size);
-
-#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
-#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
-
 #endif /* _ASM_NIOS2_DMA_MAPPING_H */
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index ac5da75..43c1149 100644
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c
@@ -20,9 +20,46 @@
 #include <linux/cache.h>
 #include <asm/cacheflush.h>
 
+static inline void __dma_sync_for_device(void *vaddr, size_t size,
+			      enum dma_data_direction direction)
+{
+	switch (direction) {
+	case DMA_FROM_DEVICE:
+		invalidate_dcache_range((unsigned long)vaddr,
+			(unsigned long)(vaddr + size));
+		break;
+	case DMA_TO_DEVICE:
+		/*
+		 * We just need to flush the caches here , but Nios2 flush
+		 * instruction will do both writeback and invalidate.
+		 */
+	case DMA_BIDIRECTIONAL: /* flush and invalidate */
+		flush_dcache_range((unsigned long)vaddr,
+			(unsigned long)(vaddr + size));
+		break;
+	default:
+		BUG();
+	}
+}
 
-void *dma_alloc_coherent(struct device *dev, size_t size,
-			    dma_addr_t *dma_handle, gfp_t gfp)
+static inline void __dma_sync_for_cpu(void *vaddr, size_t size,
+			      enum dma_data_direction direction)
+{
+	switch (direction) {
+	case DMA_BIDIRECTIONAL:
+	case DMA_FROM_DEVICE:
+		invalidate_dcache_range((unsigned long)vaddr,
+			(unsigned long)(vaddr + size));
+		break;
+	case DMA_TO_DEVICE:
+		break;
+	default:
+		BUG();
+	}
+}
+
+static void *nios2_dma_alloc(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
 {
 	void *ret;
 
@@ -45,24 +82,21 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 
 	return ret;
 }
-EXPORT_SYMBOL(dma_alloc_coherent);
 
-void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
-			dma_addr_t dma_handle)
+static void nios2_dma_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_handle, struct dma_attrs *attrs)
 {
 	unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
 
 	free_pages(addr, get_order(size));
 }
-EXPORT_SYMBOL(dma_free_coherent);
 
-int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-		enum dma_data_direction direction)
+static int nios2_dma_map_sg(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction direction,
+		struct dma_attrs *attrs)
 {
 	int i;
 
-	BUG_ON(!valid_dma_direction(direction));
-
 	for_each_sg(sg, sg, nents, i) {
 		void *addr;
 
@@ -75,40 +109,32 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 
 	return nents;
 }
-EXPORT_SYMBOL(dma_map_sg);
 
-dma_addr_t dma_map_page(struct device *dev, struct page *page,
+static dma_addr_t nios2_dma_map_page(struct device *dev, struct page *page,
 			unsigned long offset, size_t size,
-			enum dma_data_direction direction)
+			enum dma_data_direction direction,
+			struct dma_attrs *attrs)
 {
-	void *addr;
-
-	BUG_ON(!valid_dma_direction(direction));
+	void *addr = page_address(page) + offset;
 
-	addr = page_address(page) + offset;
 	__dma_sync_for_device(addr, size, direction);
-
 	return page_to_phys(page) + offset;
 }
-EXPORT_SYMBOL(dma_map_page);
 
-void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-		    enum dma_data_direction direction)
+static void nios2_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+		size_t size, enum dma_data_direction direction,
+		struct dma_attrs *attrs)
 {
-	BUG_ON(!valid_dma_direction(direction));
-
 	__dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
 }
-EXPORT_SYMBOL(dma_unmap_page);
 
-void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
-		  enum dma_data_direction direction)
+static void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+		int nhwentries, enum dma_data_direction direction,
+		struct dma_attrs *attrs)
 {
 	void *addr;
 	int i;
 
-	BUG_ON(!valid_dma_direction(direction));
-
 	if (direction == DMA_TO_DEVICE)
 		return;
 
@@ -118,69 +144,52 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 			__dma_sync_for_cpu(addr, sg->length, direction);
 	}
 }
-EXPORT_SYMBOL(dma_unmap_sg);
-
-void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-			     size_t size, enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
 
-	__dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
-}
-EXPORT_SYMBOL(dma_sync_single_for_cpu);
-
-void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
-				size_t size, enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-
-	__dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
-}
-EXPORT_SYMBOL(dma_sync_single_for_device);
-
-void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
-					unsigned long offset, size_t size,
-					enum dma_data_direction direction)
+static void nios2_dma_sync_single_for_cpu(struct device *dev,
+		dma_addr_t dma_handle, size_t size,
+		enum dma_data_direction direction)
 {
-	BUG_ON(!valid_dma_direction(direction));
-
 	__dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
 }
-EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 
-void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
-					unsigned long offset, size_t size,
-					enum dma_data_direction direction)
+static void nios2_dma_sync_single_for_device(struct device *dev,
+		dma_addr_t dma_handle, size_t size,
+		enum dma_data_direction direction)
 {
-	BUG_ON(!valid_dma_direction(direction));
-
 	__dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
 }
-EXPORT_SYMBOL(dma_sync_single_range_for_device);
 
-void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
-			 enum dma_data_direction direction)
+static void nios2_dma_sync_sg_for_cpu(struct device *dev,
+		struct scatterlist *sg, int nelems,
+		enum dma_data_direction direction)
 {
 	int i;
 
-	BUG_ON(!valid_dma_direction(direction));
-
 	/* Make sure that gcc doesn't leave the empty loop body.  */
 	for_each_sg(sg, sg, nelems, i)
 		__dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
 }
-EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 
-void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
-				int nelems, enum dma_data_direction direction)
+static void nios2_dma_sync_sg_for_device(struct device *dev,
+		struct scatterlist *sg, int nelems,
+		enum dma_data_direction direction)
 {
 	int i;
 
-	BUG_ON(!valid_dma_direction(direction));
-
 	/* Make sure that gcc doesn't leave the empty loop body.  */
 	for_each_sg(sg, sg, nelems, i)
 		__dma_sync_for_device(sg_virt(sg), sg->length, direction);
 
 }
-EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+struct dma_map_ops nios2_dma_ops = {
+	.alloc                  = nios2_dma_alloc,
+	.free                   = nios2_dma_free,
+	.map_page               = nios2_dma_map_page,
+	.map_sg                 = nios2_dma_map_sg,
+	.sync_single_for_device = nios2_dma_sync_single_for_device,
+	.sync_single_for_cpu    = nios2_dma_sync_single_for_cpu,
+	.sync_sg_for_cpu        = nios2_dma_sync_sg_for_cpu,
+	.sync_sg_for_dev        = nios2_dma_sync_sg_for_device,
+};
+EXPORT_SYMBOL(nios2_dma_ops);
-- 
1.9.1