2 * Copyright (C) 2004 IBM
4 * Implements the generic device dma API for powerpc.
5 * the pci and vio busses
7 #ifndef _ASM_DMA_MAPPING_H
8 #define _ASM_DMA_MAPPING_H
11 #include <linux/types.h>
12 #include <linux/cache.h>
13 /* need struct page definitions */
15 #include <linux/scatterlist.h>
16 #include <linux/dma-attrs.h>
17 #include <linux/dma-debug.h>
19 #include <asm/swiotlb.h>
21 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
23 /* Some dma direct funcs must be visible for use in other dma_ops */
24 extern void *dma_direct_alloc_coherent(struct device
*dev
, size_t size
,
25 dma_addr_t
*dma_handle
, gfp_t flag
,
26 struct dma_attrs
*attrs
);
27 extern void dma_direct_free_coherent(struct device
*dev
, size_t size
,
28 void *vaddr
, dma_addr_t dma_handle
,
29 struct dma_attrs
*attrs
);
32 #ifdef CONFIG_NOT_COHERENT_CACHE
34 * DMA-consistent mapping functions for PowerPCs that don't support
35 * cache snooping. These allocate/free a region of uncached mapped
36 * memory space for use with DMA devices. Alternatively, you could
37 * allocate the space "normally" and use the cache management functions
38 * to ensure it is consistent.
41 extern void *__dma_alloc_coherent(struct device
*dev
, size_t size
,
42 dma_addr_t
*handle
, gfp_t gfp
);
43 extern void __dma_free_coherent(size_t size
, void *vaddr
);
44 extern void __dma_sync(void *vaddr
, size_t size
, int direction
);
45 extern void __dma_sync_page(struct page
*page
, unsigned long offset
,
46 size_t size
, int direction
);
47 extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr
);
49 #else /* ! CONFIG_NOT_COHERENT_CACHE */
51 * Cache coherent cores.
54 #define __dma_alloc_coherent(dev, gfp, size, handle) NULL
55 #define __dma_free_coherent(size, addr) ((void)0)
56 #define __dma_sync(addr, size, rw) ((void)0)
57 #define __dma_sync_page(pg, off, sz, rw) ((void)0)
59 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
61 static inline unsigned long device_to_mask(struct device
*dev
)
63 if (dev
->dma_mask
&& *dev
->dma_mask
)
64 return *dev
->dma_mask
;
65 /* Assume devices without mask can take 32 bit addresses */
70 * Available generic sets of operations
73 extern struct dma_map_ops dma_iommu_ops
;
75 extern struct dma_map_ops dma_direct_ops
;
77 static inline struct dma_map_ops
*get_dma_ops(struct device
*dev
)
79 /* We don't handle the NULL dev case for ISA for now. We could
80 * do it via an out of line call but it is not needed for now. The
81 * only ISA DMA device we support is the floppy and we have a hack
82 * in the floppy driver directly to get a device for us.
84 if (unlikely(dev
== NULL
))
87 return dev
->archdata
.dma_ops
;
90 static inline void set_dma_ops(struct device
*dev
, struct dma_map_ops
*ops
)
92 dev
->archdata
.dma_ops
= ops
;
98 * Get the dma offset on configurations where the dma address can be determined
99 * from the physical address by looking at a simple offset. Direct dma and
100 * swiotlb use this function, but it is typically not used by implementations
103 static inline dma_addr_t
get_dma_offset(struct device
*dev
)
106 return dev
->archdata
.dma_data
.dma_offset
;
108 return PCI_DRAM_OFFSET
;
111 static inline void set_dma_offset(struct device
*dev
, dma_addr_t off
)
114 dev
->archdata
.dma_data
.dma_offset
= off
;
117 /* this will be removed soon */
118 #define flush_write_buffers()
120 #include <asm-generic/dma-mapping-common.h>
122 static inline int dma_supported(struct device
*dev
, u64 mask
)
124 struct dma_map_ops
*dma_ops
= get_dma_ops(dev
);
126 if (unlikely(dma_ops
== NULL
))
128 if (dma_ops
->dma_supported
== NULL
)
130 return dma_ops
->dma_supported(dev
, mask
);
133 extern int dma_set_mask(struct device
*dev
, u64 dma_mask
);
135 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
137 static inline void *dma_alloc_attrs(struct device
*dev
, size_t size
,
138 dma_addr_t
*dma_handle
, gfp_t flag
,
139 struct dma_attrs
*attrs
)
141 struct dma_map_ops
*dma_ops
= get_dma_ops(dev
);
146 cpu_addr
= dma_ops
->alloc(dev
, size
, dma_handle
, flag
, attrs
);
148 debug_dma_alloc_coherent(dev
, size
, *dma_handle
, cpu_addr
);
153 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
155 static inline void dma_free_attrs(struct device
*dev
, size_t size
,
156 void *cpu_addr
, dma_addr_t dma_handle
,
157 struct dma_attrs
*attrs
)
159 struct dma_map_ops
*dma_ops
= get_dma_ops(dev
);
163 debug_dma_free_coherent(dev
, size
, cpu_addr
, dma_handle
);
165 dma_ops
->free(dev
, size
, cpu_addr
, dma_handle
, attrs
);
168 static inline int dma_mapping_error(struct device
*dev
, dma_addr_t dma_addr
)
170 struct dma_map_ops
*dma_ops
= get_dma_ops(dev
);
172 if (dma_ops
->mapping_error
)
173 return dma_ops
->mapping_error(dev
, dma_addr
);
176 return (dma_addr
== DMA_ERROR_CODE
);
182 static inline bool dma_capable(struct device
*dev
, dma_addr_t addr
, size_t size
)
184 #ifdef CONFIG_SWIOTLB
185 struct dev_archdata
*sd
= &dev
->archdata
;
187 if (sd
->max_direct_dma_addr
&& addr
+ size
> sd
->max_direct_dma_addr
)
194 return addr
+ size
- 1 <= *dev
->dma_mask
;
197 static inline dma_addr_t
phys_to_dma(struct device
*dev
, phys_addr_t paddr
)
199 return paddr
+ get_dma_offset(dev
);
202 static inline phys_addr_t
dma_to_phys(struct device
*dev
, dma_addr_t daddr
)
204 return daddr
- get_dma_offset(dev
);
207 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
208 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
210 extern int dma_mmap_coherent(struct device
*, struct vm_area_struct
*,
211 void *, dma_addr_t
, size_t);
212 #define ARCH_HAS_DMA_MMAP_COHERENT
215 static inline void dma_cache_sync(struct device
*dev
, void *vaddr
, size_t size
,
216 enum dma_data_direction direction
)
218 BUG_ON(direction
== DMA_NONE
);
219 __dma_sync(vaddr
, size
, (int)direction
);
222 #endif /* __KERNEL__ */
223 #endif /* _ASM_DMA_MAPPING_H */