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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