1 files changed, 474 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
new file mode 100644
index 00000000000..c7ca45f97dd
--- /dev/null
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -0,0 +1,474 @@
+/*
+ * Copyright (C) 2004 IBM
+ *
+ * Implements the generic device dma API for powerpc.
+ * the pci and vio busses
+ */
+#ifndef _ASM_DMA_MAPPING_H
+#define _ASM_DMA_MAPPING_H
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/cache.h>
+/* need struct page definitions */
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-attrs.h>
+#include <asm/io.h>
+
+#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)
+
+#ifdef CONFIG_NOT_COHERENT_CACHE
+/*
+ * DMA-consistent mapping functions for PowerPCs that don't support
+ * cache snooping.  These allocate/free a region of uncached mapped
+ * memory space for use with DMA devices.  Alternatively, you could
+ * allocate the space "normally" and use the cache management functions
+ * to ensure it is consistent.
+ */
+extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
+extern void __dma_free_coherent(size_t size, void *vaddr);
+extern void __dma_sync(void *vaddr, size_t size, int direction);
+extern void __dma_sync_page(struct page *page, unsigned long offset,
+				 size_t size, int direction);
+
+#else /* ! CONFIG_NOT_COHERENT_CACHE */
+/*
+ * Cache coherent cores.
+ */
+
+#define __dma_alloc_coherent(gfp, size, handle)	NULL
+#define __dma_free_coherent(size, addr)		((void)0)
+#define __dma_sync(addr, size, rw)		((void)0)
+#define __dma_sync_page(pg, off, sz, rw)	((void)0)
+
+#endif /* ! CONFIG_NOT_COHERENT_CACHE */
+
+#ifdef CONFIG_PPC64
+
+static inline unsigned long device_to_mask(struct device *dev)
+{
+	if (dev->dma_mask && *dev->dma_mask)
+		return *dev->dma_mask;
+	/* Assume devices without mask can take 32 bit addresses */
+	return 0xfffffffful;
+}
+
+/*
+ * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
+ */
+struct dma_mapping_ops {
+	void *		(*alloc_coherent)(struct device *dev, size_t size,
+				dma_addr_t *dma_handle, gfp_t flag);
+	void		(*free_coherent)(struct device *dev, size_t size,
+				void *vaddr, dma_addr_t dma_handle);
+	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
+				size_t size, enum dma_data_direction direction,
+				struct dma_attrs *attrs);
+	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
+				size_t size, enum dma_data_direction direction,
+				struct dma_attrs *attrs);
+	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction,
+				struct dma_attrs *attrs);
+	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction,
+				struct dma_attrs *attrs);
+	int		(*dma_supported)(struct device *dev, u64 mask);
+	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
+};
+
+static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+	/* We don't handle the NULL dev case for ISA for now. We could
+	 * do it via an out of line call but it is not needed for now. The
+	 * only ISA DMA device we support is the floppy and we have a hack
+	 * in the floppy driver directly to get a device for us.
+	 */
+	if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
+		return NULL;
+	return dev->archdata.dma_ops;
+}
+
+static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
+{
+	dev->archdata.dma_ops = ops;
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (unlikely(dma_ops == NULL))
+		return 0;
+	if (dma_ops->dma_supported == NULL)
+		return 1;
+	return dma_ops->dma_supported(dev, mask);
+}
+
+/* We have our own implementation of pci_set_dma_mask() */
+#define HAVE_ARCH_PCI_SET_DMA_MASK
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (unlikely(dma_ops == NULL))
+		return -EIO;
+	if (dma_ops->set_dma_mask != NULL)
+		return dma_ops->set_dma_mask(dev, dma_mask);
+	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+		return -EIO;
+	*dev->dma_mask = dma_mask;
+	return 0;
+}
+
+static inline dma_addr_t dma_map_single_attrs(struct device *dev,
+					      void *cpu_addr,
+					      size_t size,
+					      enum dma_data_direction direction,
+					      struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_single(dev, cpu_addr, size, direction, attrs);
+}
+
+static inline void dma_unmap_single_attrs(struct device *dev,
+					  dma_addr_t dma_addr,
+					  size_t size,
+					  enum dma_data_direction direction,
+					  struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_single(dev, dma_addr, size, direction, attrs);
+}
+
+static inline dma_addr_t dma_map_page_attrs(struct device *dev,
+					    struct page *page,
+					    unsigned long offset, size_t size,
+					    enum dma_data_direction direction,
+					    struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_single(dev, page_address(page) + offset, size,
+			direction, attrs);
+}
+
+static inline void dma_unmap_page_attrs(struct device *dev,
+					dma_addr_t dma_address,
+					size_t size,
+					enum dma_data_direction direction,
+					struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_single(dev, dma_address, size, direction, attrs);
+}
+
+static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+				   int nents, enum dma_data_direction direction,
+				   struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_sg(dev, sg, nents, direction, attrs);
+}
+
+static inline void dma_unmap_sg_attrs(struct device *dev,
+				      struct scatterlist *sg,
+				      int nhwentries,
+				      enum dma_data_direction direction,
+				      struct dma_attrs *attrs)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+				       dma_addr_t *dma_handle, gfp_t flag)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+				     void *cpu_addr, dma_addr_t dma_handle)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	BUG_ON(!dma_ops);
+	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+}
+
+static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
+					size_t size,
+					enum dma_data_direction direction)
+{
+	return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
+}
+
+static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+				    size_t size,
+				    enum dma_data_direction direction)
+{
+	dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
+}
+
+static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
+				      unsigned long offset, size_t size,
+				      enum dma_data_direction direction)
+{
+	return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
+}
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+				  size_t size,
+				  enum dma_data_direction direction)
+{
+	dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
+}
+
+static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
+			     int nents, enum dma_data_direction direction)
+{
+	return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
+}
+
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+				int nhwentries,
+				enum dma_data_direction direction)
+{
+	dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
+}
+
+/*
+ * Available generic sets of operations
+ */
+extern struct dma_mapping_ops dma_iommu_ops;
+extern struct dma_mapping_ops dma_direct_ops;
+
+#else /* CONFIG_PPC64 */
+
+#define dma_supported(dev, mask)	(1)
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+	if (!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+
+	*dev->dma_mask = dma_mask;
+
+	return 0;
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+				       dma_addr_t * dma_handle,
+				       gfp_t gfp)
+{
+#ifdef CONFIG_NOT_COHERENT_CACHE
+	return __dma_alloc_coherent(size, dma_handle, gfp);
+#else
+	void *ret;
+	/* ignore region specifiers */
+	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+	if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
+		gfp |= GFP_DMA;
+
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+
+	return ret;
+#endif
+}
+
+static inline void
+dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+		  dma_addr_t dma_handle)
+{
+#ifdef CONFIG_NOT_COHERENT_CACHE
+	__dma_free_coherent(size, vaddr);
+#else
+	free_pages((unsigned long)vaddr, get_order(size));
+#endif
+}
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *ptr, size_t size,
+	       enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+
+	__dma_sync(ptr, size, direction);
+
+	return virt_to_bus(ptr);
+}
+
+static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+				    size_t size,
+				    enum dma_data_direction direction)
+{
+	/* We do nothing. */
+}
+
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page,
+	     unsigned long offset, size_t size,
+	     enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+
+	__dma_sync_page(page, offset, size, direction);
+
+	return page_to_bus(page) + offset;
+}
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+				  size_t size,
+				  enum dma_data_direction direction)
+{
+	/* We do nothing. */
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
+	   enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for_each_sg(sgl, sg, nents, i) {
+		BUG_ON(!sg_page(sg));
+		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
+	}
+
+	return nents;
+}
+
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+				int nhwentries,
+				enum dma_data_direction direction)
+{
+	/* We don't do anything here. */
+}
+
+#endif /* CONFIG_PPC64 */
+
+static inline void dma_sync_single_for_cpu(struct device *dev,
+		dma_addr_t dma_handle, size_t size,
+		enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	__dma_sync(bus_to_virt(dma_handle), size, direction);
+}
+
+static inline void dma_sync_single_for_device(struct device *dev,
+		dma_addr_t dma_handle, size_t size,
+		enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	__dma_sync(bus_to_virt(dma_handle), size, direction);
+}
+
+static inline void dma_sync_sg_for_cpu(struct device *dev,
+		struct scatterlist *sgl, int nents,
+		enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for_each_sg(sgl, sg, nents, i)
+		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+}
+
+static inline void dma_sync_sg_for_device(struct device *dev,
+		struct scatterlist *sgl, int nents,
+		enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for_each_sg(sgl, sg, nents, i)
+		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+#ifdef CONFIG_PPC64
+	return (dma_addr == DMA_ERROR_CODE);
+#else
+	return 0;
+#endif
+}
+
+#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)
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define dma_is_consistent(d, h)	(0)
+#else
+#define dma_is_consistent(d, h)	(1)
+#endif
+
+static inline int dma_get_cache_alignment(void)
+{
+#ifdef CONFIG_PPC64
+	/* no easy way to get cache size on all processors, so return
+	 * the maximum possible, to be safe */
+	return (1 << INTERNODE_CACHE_SHIFT);
+#else
+	/*
+	 * Each processor family will define its own L1_CACHE_SHIFT,
+	 * L1_CACHE_BYTES wraps to this, so this is always safe.
+	 */
+	return L1_CACHE_BYTES;
+#endif
+}
+
+static inline 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)
+{
+	/* just sync everything for now */
+	dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
+}
+
+static inline 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)
+{
+	/* just sync everything for now */
+	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
+}
+
+static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+		enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	__dma_sync(vaddr, size, (int)direction);
+}
+
+#endif /* __KERNEL__ */
+#endif	/* _ASM_DMA_MAPPING_H */