1 files changed, 285 insertions, 0 deletions
diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
new file mode 100644
index 00000000000..59a80163f75
--- /dev/null
+++ b/include/asm-powerpc/dma-mapping.h
@@ -0,0 +1,285 @@
+/*
+ * 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
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/cache.h>
+/* need struct page definitions */
+#include <linux/mm.h>
+#include <asm/scatterlist.h>
+#include <asm/io.h>
+#include <asm/bug.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)		do { } while (0)
+#define __dma_sync(addr, size, rw)		do { } while (0)
+#define __dma_sync_page(pg, off, sz, rw)	do { } while (0)
+
+#endif /* ! CONFIG_NOT_COHERENT_CACHE */
+
+#ifdef CONFIG_PPC64
+
+extern int dma_supported(struct device *dev, u64 mask);
+extern int dma_set_mask(struct device *dev, u64 dma_mask);
+extern void *dma_alloc_coherent(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, gfp_t flag);
+extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
+		dma_addr_t dma_handle);
+extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
+		size_t size, enum dma_data_direction direction);
+extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+		size_t size, 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 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+		enum dma_data_direction direction);
+extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+		int nhwentries, enum dma_data_direction direction);
+
+#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);
+}
+
+/* We do nothing. */
+#define dma_unmap_single(dev, addr, size, dir)	do { } while (0)
+
+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;
+}
+
+/* We do nothing. */
+#define dma_unmap_page(dev, handle, size, dir)	do { } while (0)
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+	   enum dma_data_direction direction)
+{
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for (i = 0; i < nents; i++, sg++) {
+		BUG_ON(!sg->page);
+		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
+		sg->dma_address = page_to_bus(sg->page) + sg->offset;
+	}
+
+	return nents;
+}
+
+/* We don't do anything here. */
+#define dma_unmap_sg(dev, sg, nents, dir)	do { } while (0)
+
+#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 *sg, int nents,
+		enum dma_data_direction direction)
+{
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for (i = 0; i < nents; i++, sg++)
+		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
+}
+
+static inline void dma_sync_sg_for_device(struct device *dev,
+		struct scatterlist *sg, int nents,
+		enum dma_data_direction direction)
+{
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	for (i = 0; i < nents; i++, sg++)
+		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
+}
+
+static inline int dma_mapping_error(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)	(0)
+#else
+#define dma_is_consistent(d)	(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 << L1_CACHE_SHIFT_MAX);
+#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(void *vaddr, size_t size,
+		enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	__dma_sync(vaddr, size, (int)direction);
+}
+
+/*
+ * 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);
+	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
+				size_t size, enum dma_data_direction direction);
+	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction);
+	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction);
+	int		(*dma_supported)(struct device *dev, u64 mask);
+	int		(*dac_dma_supported)(struct device *dev, u64 mask);
+};
+
+#endif	/* _ASM_DMA_MAPPING_H */