1#ifndef _ASM_LINUX_DMA_MAPPING_H
2#define _ASM_LINUX_DMA_MAPPING_H
3
4#include <linux/device.h>
5#include <linux/err.h>
6
7/* These definitions mirror those in pci.h, so they can be used
8 * interchangeably with their PCI_ counterparts */
9enum dma_data_direction {
10	DMA_BIDIRECTIONAL = 0,
11	DMA_TO_DEVICE = 1,
12	DMA_FROM_DEVICE = 2,
13	DMA_NONE = 3,
14};
15
16#define DMA_64BIT_MASK	0xffffffffffffffffULL
17#define DMA_48BIT_MASK	0x0000ffffffffffffULL
18#define DMA_40BIT_MASK	0x000000ffffffffffULL
19#define DMA_39BIT_MASK	0x0000007fffffffffULL
20#define DMA_32BIT_MASK	0x00000000ffffffffULL
21#define DMA_31BIT_MASK	0x000000007fffffffULL
22#define DMA_30BIT_MASK	0x000000003fffffffULL
23#define DMA_29BIT_MASK	0x000000001fffffffULL
24#define DMA_28BIT_MASK	0x000000000fffffffULL
25#define DMA_24BIT_MASK	0x0000000000ffffffULL
26
27static inline int valid_dma_direction(int dma_direction)
28{
29	return ((dma_direction == DMA_BIDIRECTIONAL) ||
30		(dma_direction == DMA_TO_DEVICE) ||
31		(dma_direction == DMA_FROM_DEVICE));
32}
33
34#include <asm/dma-mapping.h>
35
36/* Backwards compat, remove in 2.7.x */
37#define dma_sync_single		dma_sync_single_for_cpu
38#define dma_sync_sg		dma_sync_sg_for_cpu
39
40extern u64 dma_get_required_mask(struct device *dev);
41
42/* flags for the coherent memory api */
43#define	DMA_MEMORY_MAP			0x01
44#define DMA_MEMORY_IO			0x02
45#define DMA_MEMORY_INCLUDES_CHILDREN	0x04
46#define DMA_MEMORY_EXCLUSIVE		0x08
47
48#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
49static inline int
50dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
51			    dma_addr_t device_addr, size_t size, int flags)
52{
53	return 0;
54}
55
56static inline void
57dma_release_declared_memory(struct device *dev)
58{
59}
60
61static inline void *
62dma_mark_declared_memory_occupied(struct device *dev,
63				  dma_addr_t device_addr, size_t size)
64{
65	return ERR_PTR(-EBUSY);
66}
67#endif
68
69/*
70 * Managed DMA API
71 */
72extern void *dmam_alloc_coherent(struct device *dev, size_t size,
73				 dma_addr_t *dma_handle, gfp_t gfp);
74extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
75			       dma_addr_t dma_handle);
76extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
77				    dma_addr_t *dma_handle, gfp_t gfp);
78extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
79				  dma_addr_t dma_handle);
80#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
81extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
82					dma_addr_t device_addr, size_t size,
83					int flags);
84extern void dmam_release_declared_memory(struct device *dev);
85#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
86static inline int dmam_declare_coherent_memory(struct device *dev,
87				dma_addr_t bus_addr, dma_addr_t device_addr,
88				size_t size, gfp_t gfp)
89{
90	return 0;
91}
92
93static inline void dmam_release_declared_memory(struct device *dev)
94{
95}
96#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
97
98#endif
99