tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2012 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 __ASM_DMA_MAPPING_H
17#define __ASM_DMA_MAPPING_H
18
19#ifdef __KERNEL__
20
21#include <linux/types.h>
22#include <linux/vmalloc.h>
23
24#include <xen/xen.h>
25#include <asm/xen/hypervisor.h>
26
27extern const struct dma_map_ops dummy_dma_ops;
28
29static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
30{
31 /*
32 * We expect no ISA devices, and all other DMA masters are expected to
33 * have someone call arch_setup_dma_ops at device creation time.
34 */
35 return &dummy_dma_ops;
36}
37
38void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
39 const struct iommu_ops *iommu, bool coherent);
40#define arch_setup_dma_ops arch_setup_dma_ops
41
42#ifdef CONFIG_IOMMU_DMA
43void arch_teardown_dma_ops(struct device *dev);
44#define arch_teardown_dma_ops arch_teardown_dma_ops
45#endif
46
47/* do not use this function in a driver */
48static inline bool is_device_dma_coherent(struct device *dev)
49{
50 return dev->archdata.dma_coherent;
51}
52
53static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
54{
55 dma_addr_t dev_addr = (dma_addr_t)paddr;
56
57 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
58}
59
60static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
61{
62 phys_addr_t paddr = (phys_addr_t)dev_addr;
63
64 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
65}
66
67static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
68{
69 if (!dev->dma_mask)
70 return false;
71
72 return addr + size - 1 <= *dev->dma_mask;
73}
74
75static inline void dma_mark_clean(void *addr, size_t size)
76{
77}
78
79/* Override for dma_max_pfn() */
80static inline unsigned long dma_max_pfn(struct device *dev)
81{
82 dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
83
84 return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
85}
86#define dma_max_pfn(dev) dma_max_pfn(dev)
87
88#endif /* __KERNEL__ */
89#endif /* __ASM_DMA_MAPPING_H */