Fix powerpc breakage in sg chaining code

 */

#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 <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

/*

 * 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		(*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 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);

}

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 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)

{

	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);

	return dma_ops->map_single(dev, cpu_addr, size, direction);

}

static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,

				    size_t size,

				    enum dma_data_direction direction)

{

	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);

	dma_ops->unmap_single(dev, dma_addr, size, direction);

}

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)

{

	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);

}

static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,

				  size_t size,