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Linux/arch/ia64/include/asm/dma-mapping.h

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  1 #ifndef _ASM_IA64_DMA_MAPPING_H
  2 #define _ASM_IA64_DMA_MAPPING_H
  3 
  4 /*
  5  * Copyright (C) 2003-2004 Hewlett-Packard Co
  6  *      David Mosberger-Tang <davidm@hpl.hp.com>
  7  */
  8 #include <asm/machvec.h>
  9 #include <linux/scatterlist.h>
 10 #include <asm/swiotlb.h>
 11 #include <linux/dma-debug.h>
 12 
 13 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
 14 
 15 #define DMA_ERROR_CODE 0
 16 
 17 extern struct dma_map_ops *dma_ops;
 18 extern struct ia64_machine_vector ia64_mv;
 19 extern void set_iommu_machvec(void);
 20 
 21 extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
 22                                     enum dma_data_direction);
 23 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
 24                                 enum dma_data_direction);
 25 
 26 #define dma_alloc_coherent(d,s,h,f)     dma_alloc_attrs(d,s,h,f,NULL)
 27 
 28 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 29                                     dma_addr_t *daddr, gfp_t gfp,
 30                                     struct dma_attrs *attrs)
 31 {
 32         struct dma_map_ops *ops = platform_dma_get_ops(dev);
 33         void *caddr;
 34 
 35         caddr = ops->alloc(dev, size, daddr, gfp, attrs);
 36         debug_dma_alloc_coherent(dev, size, *daddr, caddr);
 37         return caddr;
 38 }
 39 
 40 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
 41 
 42 static inline void dma_free_attrs(struct device *dev, size_t size,
 43                                   void *caddr, dma_addr_t daddr,
 44                                   struct dma_attrs *attrs)
 45 {
 46         struct dma_map_ops *ops = platform_dma_get_ops(dev);
 47         debug_dma_free_coherent(dev, size, caddr, daddr);
 48         ops->free(dev, size, caddr, daddr, attrs);
 49 }
 50 
 51 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 52 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 53 
 54 #define get_dma_ops(dev) platform_dma_get_ops(dev)
 55 
 56 #include <asm-generic/dma-mapping-common.h>
 57 
 58 static inline int dma_mapping_error(struct device *dev, dma_addr_t daddr)
 59 {
 60         struct dma_map_ops *ops = platform_dma_get_ops(dev);
 61         return ops->mapping_error(dev, daddr);
 62 }
 63 
 64 static inline int dma_supported(struct device *dev, u64 mask)
 65 {
 66         struct dma_map_ops *ops = platform_dma_get_ops(dev);
 67         return ops->dma_supported(dev, mask);
 68 }
 69 
 70 static inline int
 71 dma_set_mask (struct device *dev, u64 mask)
 72 {
 73         if (!dev->dma_mask || !dma_supported(dev, mask))
 74                 return -EIO;
 75         *dev->dma_mask = mask;
 76         return 0;
 77 }
 78 
 79 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 80 {
 81         if (!dev->dma_mask)
 82                 return 0;
 83 
 84         return addr + size - 1 <= *dev->dma_mask;
 85 }
 86 
 87 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 88 {
 89         return paddr;
 90 }
 91 
 92 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 93 {
 94         return daddr;
 95 }
 96 
 97 static inline void
 98 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
 99         enum dma_data_direction dir)
100 {
101         /*
102          * IA-64 is cache-coherent, so this is mostly a no-op.  However, we do need to
103          * ensure that dma_cache_sync() enforces order, hence the mb().
104          */
105         mb();
106 }
107 
108 #endif /* _ASM_IA64_DMA_MAPPING_H */
109 

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