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 extern const struct dma_map_ops *dma_ops;
16 extern struct ia64_machine_vector ia64_mv;
17 extern void set_iommu_machvec(void);
18 
19 extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
20 				    enum dma_data_direction);
21 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
22 				enum dma_data_direction);
23 
24 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
25 {
26 	return platform_dma_get_ops(NULL);
27 }
28 
29 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
30 {
31 	if (!dev->dma_mask)
32 		return 0;
33 
34 	return addr + size - 1 <= *dev->dma_mask;
35 }
36 
37 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
38 {
39 	return paddr;
40 }
41 
42 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
43 {
44 	return daddr;
45 }
46 
47 static inline void
48 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
49 	enum dma_data_direction dir)
50 {
51 	/*
52 	 * IA-64 is cache-coherent, so this is mostly a no-op.  However, we do need to
53 	 * ensure that dma_cache_sync() enforces order, hence the mb().
54 	 */
55 	mb();
56 }
57 
58 #endif /* _ASM_IA64_DMA_MAPPING_H */
59