dd0fc66fb3
- added typedef unsigned int __nocast gfp_t; - replaced __nocast uses for gfp flags with gfp_t - it gives exactly the same warnings as far as sparse is concerned, doesn't change generated code (from gcc point of view we replaced unsigned int with typedef) and documents what's going on far better. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/* Copyright (C) 2004 IBM
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*
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* Implements the generic device dma API for ppc64. Handles
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* the pci and vio busses
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*/
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#ifndef _ASM_DMA_MAPPING_H
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#define _ASM_DMA_MAPPING_H
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#include <linux/types.h>
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#include <linux/cache.h>
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/* need struct page definitions */
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#include <linux/mm.h>
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#include <asm/scatterlist.h>
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#include <asm/bug.h>
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#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
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extern int dma_supported(struct device *dev, u64 mask);
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extern int dma_set_mask(struct device *dev, u64 dma_mask);
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extern void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag);
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extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_handle);
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extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
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size_t size, enum dma_data_direction direction);
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extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
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size_t size, enum dma_data_direction direction);
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extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction);
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extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
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size_t size, enum dma_data_direction direction);
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extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction);
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extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction direction);
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline int dma_mapping_error(dma_addr_t dma_addr)
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{
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return (dma_addr == DMA_ERROR_CODE);
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}
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/* Now for the API extensions over the pci_ one */
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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#define dma_is_consistent(d) (1)
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static inline int
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dma_get_cache_alignment(void)
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{
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/* no easy way to get cache size on all processors, so return
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* the maximum possible, to be safe */
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return (1 << L1_CACHE_SHIFT_MAX);
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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static inline void
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dma_cache_sync(void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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/* nothing to do */
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}
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/*
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* DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
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*/
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struct dma_mapping_ops {
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void * (*alloc_coherent)(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag);
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void (*free_coherent)(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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dma_addr_t (*map_single)(struct device *dev, void *ptr,
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size_t size, enum dma_data_direction direction);
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void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
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size_t size, enum dma_data_direction direction);
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int (*map_sg)(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction direction);
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void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction direction);
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int (*dma_supported)(struct device *dev, u64 mask);
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int (*dac_dma_supported)(struct device *dev, u64 mask);
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};
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#endif /* _ASM_DMA_MAPPING_H */
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