1 /* Copyright (C) 2004 IBM
3 * Implements the generic device dma API for ppc64. Handles
4 * the pci and vio busses
7 #ifndef _ASM_DMA_MAPPING_H
8 #define _ASM_DMA_MAPPING_H
10 #include <linux/types.h>
11 #include <linux/cache.h>
12 /* need struct page definitions */
14 #include <asm/scatterlist.h>
17 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
19 extern int dma_supported(struct device *dev, u64 mask);
20 extern int dma_set_mask(struct device *dev, u64 dma_mask);
21 extern void *dma_alloc_coherent(struct device *dev, size_t size,
22 dma_addr_t *dma_handle, unsigned int __nocast flag);
23 extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
24 dma_addr_t dma_handle);
25 extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
26 size_t size, enum dma_data_direction direction);
27 extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
28 size_t size, enum dma_data_direction direction);
29 extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
30 unsigned long offset, size_t size,
31 enum dma_data_direction direction);
32 extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
33 size_t size, enum dma_data_direction direction);
34 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
35 enum dma_data_direction direction);
36 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
37 int nhwentries, enum dma_data_direction direction);
40 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
41 enum dma_data_direction direction)
43 BUG_ON(direction == DMA_NONE);
48 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
49 enum dma_data_direction direction)
51 BUG_ON(direction == DMA_NONE);
56 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
57 enum dma_data_direction direction)
59 BUG_ON(direction == DMA_NONE);
64 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
65 enum dma_data_direction direction)
67 BUG_ON(direction == DMA_NONE);
71 static inline int dma_mapping_error(dma_addr_t dma_addr)
73 return (dma_addr == DMA_ERROR_CODE);
76 /* Now for the API extensions over the pci_ one */
78 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
79 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
80 #define dma_is_consistent(d) (1)
83 dma_get_cache_alignment(void)
85 /* no easy way to get cache size on all processors, so return
86 * the maximum possible, to be safe */
87 return (1 << L1_CACHE_SHIFT_MAX);
91 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
92 unsigned long offset, size_t size,
93 enum dma_data_direction direction)
95 BUG_ON(direction == DMA_NONE);
100 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
101 unsigned long offset, size_t size,
102 enum dma_data_direction direction)
104 BUG_ON(direction == DMA_NONE);
109 dma_cache_sync(void *vaddr, size_t size,
110 enum dma_data_direction direction)
112 BUG_ON(direction == DMA_NONE);
117 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
119 struct dma_mapping_ops {
120 void * (*alloc_coherent)(struct device *dev, size_t size,
121 dma_addr_t *dma_handle, unsigned int __nocast flag);
122 void (*free_coherent)(struct device *dev, size_t size,
123 void *vaddr, dma_addr_t dma_handle);
124 dma_addr_t (*map_single)(struct device *dev, void *ptr,
125 size_t size, enum dma_data_direction direction);
126 void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
127 size_t size, enum dma_data_direction direction);
128 int (*map_sg)(struct device *dev, struct scatterlist *sg,
129 int nents, enum dma_data_direction direction);
130 void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
131 int nents, enum dma_data_direction direction);
132 int (*dma_supported)(struct device *dev, u64 mask);
133 int (*dac_dma_supported)(struct device *dev, u64 mask);
136 #endif /* _ASM_DMA_MAPPING_H */