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
25int iommu_dma_init(void);
26
27/* Domain management interface for IOMMU drivers */
28int iommu_get_dma_cookie(struct iommu_domain *domain);
29void iommu_put_dma_cookie(struct iommu_domain *domain);
30
31/* Setup call for arch DMA mapping code */
32int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);
33
34/* General helpers for DMA-API <-> IOMMU-API interaction */
35int 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 */
41struct 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));
44void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
45		dma_addr_t *handle);
46
47int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
48
49dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
50		unsigned long offset, size_t size, int prot);
51int 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 */
58void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
59		enum dma_data_direction dir, struct dma_attrs *attrs);
60void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
61		enum dma_data_direction dir, struct dma_attrs *attrs);
62int iommu_dma_supported(struct device *dev, u64 mask);
63int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
64
65#else
66
67struct iommu_domain;
68
69static inline int iommu_dma_init(void)
70{
71	return 0;
72}
73
74static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
75{
76	return -ENODEV;
77}
78
79static 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 */
86