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0db2e5d1 RM |
1 | /* |
2 | * Copyright (C) 2014-2015 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | #ifndef __DMA_IOMMU_H | |
17 | #define __DMA_IOMMU_H | |
18 | ||
19 | #ifdef __KERNEL__ | |
20 | #include <asm/errno.h> | |
21 | ||
22 | #ifdef CONFIG_IOMMU_DMA | |
23 | #include <linux/iommu.h> | |
24 | ||
25 | int iommu_dma_init(void); | |
26 | ||
27 | /* Domain management interface for IOMMU drivers */ | |
28 | int iommu_get_dma_cookie(struct iommu_domain *domain); | |
29 | void iommu_put_dma_cookie(struct iommu_domain *domain); | |
30 | ||
31 | /* Setup call for arch DMA mapping code */ | |
32 | int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size); | |
33 | ||
34 | /* General helpers for DMA-API <-> IOMMU-API interaction */ | |
35 | int dma_direction_to_prot(enum dma_data_direction dir, bool coherent); | |
36 | ||
37 | /* | |
38 | * These implement the bulk of the relevant DMA mapping callbacks, but require | |
39 | * the arch code to take care of attributes and cache maintenance | |
40 | */ | |
41 | struct page **iommu_dma_alloc(struct device *dev, size_t size, | |
42 | gfp_t gfp, int prot, dma_addr_t *handle, | |
43 | void (*flush_page)(struct device *, const void *, phys_addr_t)); | |
44 | void iommu_dma_free(struct device *dev, struct page **pages, size_t size, | |
45 | dma_addr_t *handle); | |
46 | ||
47 | int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma); | |
48 | ||
49 | dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, | |
50 | unsigned long offset, size_t size, int prot); | |
51 | int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, | |
52 | int nents, int prot); | |
53 | ||
54 | /* | |
55 | * Arch code with no special attribute handling may use these | |
56 | * directly as DMA mapping callbacks for simplicity | |
57 | */ | |
58 | void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, | |
59 | enum dma_data_direction dir, struct dma_attrs *attrs); | |
60 | void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, | |
61 | enum dma_data_direction dir, struct dma_attrs *attrs); | |
62 | int iommu_dma_supported(struct device *dev, u64 mask); | |
63 | int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); | |
64 | ||
65 | #else | |
66 | ||
67 | struct iommu_domain; | |
68 | ||
69 | static inline int iommu_dma_init(void) | |
70 | { | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static inline int iommu_get_dma_cookie(struct iommu_domain *domain) | |
75 | { | |
76 | return -ENODEV; | |
77 | } | |
78 | ||
79 | static inline void iommu_put_dma_cookie(struct iommu_domain *domain) | |
80 | { | |
81 | } | |
82 | ||
83 | #endif /* CONFIG_IOMMU_DMA */ | |
84 | #endif /* __KERNEL__ */ | |
85 | #endif /* __DMA_IOMMU_H */ |