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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
27 #define DMA_ERROR_CODE (~(dma_addr_t)0)
28 extern struct dma_map_ops dummy_dma_ops;
29
30 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
31 {
32 if (dev && dev->archdata.dma_ops)
33 return dev->archdata.dma_ops;
34
35 /*
36 * We expect no ISA devices, and all other DMA masters are expected to
37 * have someone call arch_setup_dma_ops at device creation time.
38 */
39 return &dummy_dma_ops;
40 }
41
42 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
43 {
44 if (xen_initial_domain())
45 return xen_dma_ops;
46 else
47 return __generic_dma_ops(dev);
48 }
49
50 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
51 struct iommu_ops *iommu, bool coherent);
52 #define arch_setup_dma_ops arch_setup_dma_ops
53
54 #ifdef CONFIG_IOMMU_DMA
55 void arch_teardown_dma_ops(struct device *dev);
56 #define arch_teardown_dma_ops arch_teardown_dma_ops
57 #endif
58
59 /* do not use this function in a driver */
60 static inline bool is_device_dma_coherent(struct device *dev)
61 {
62 if (!dev)
63 return false;
64 return dev->archdata.dma_coherent;
65 }
66
67 #include <asm-generic/dma-mapping-common.h>
68
69 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
70 {
71 return (dma_addr_t)paddr;
72 }
73
74 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
75 {
76 return (phys_addr_t)dev_addr;
77 }
78
79 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
80 {
81 if (!dev->dma_mask)
82 return false;
83
84 return addr + size - 1 <= *dev->dma_mask;
85 }
86
87 static inline void dma_mark_clean(void *addr, size_t size)
88 {
89 }
90
91 #endif /* __KERNEL__ */
92 #endif /* __ASM_DMA_MAPPING_H */