2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
16 #ifndef __ASM_DMA_MAPPING_H
17 #define __ASM_DMA_MAPPING_H
21 #include <linux/types.h>
22 #include <linux/vmalloc.h>
25 #include <asm/cacheflush.h>
26 #include <asm/xen/hypervisor.h>
28 #define DMA_ERROR_CODE (~(dma_addr_t)0)
29 extern struct dma_map_ops dummy_dma_ops;
30 extern struct dma_map_ops swiotlb_dma_ops;
32 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
34 if (dev && dev->archdata.dma_ops)
35 return dev->archdata.dma_ops;
38 * For ion APIs, they have no devices, we force it to call swiotlb_dma_ops
40 * Revert me if ion has fixed this issue.
42 return &swiotlb_dma_ops;
44 * We expect no ISA devices, and all other DMA masters are expected to
45 * have someone call arch_setup_dma_ops at device creation time.
47 return &dummy_dma_ops;
50 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
52 if (xen_initial_domain())
55 return __generic_dma_ops(dev);
58 static inline void arch_set_dma_ops(struct device *dev, struct dma_map_ops *ops)
60 dev->archdata.dma_ops = ops;
63 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
64 struct iommu_ops *iommu, bool coherent);
65 #define arch_setup_dma_ops arch_setup_dma_ops
67 void arch_teardown_dma_ops(struct device *dev);
68 #define arch_teardown_dma_ops arch_teardown_dma_ops
70 /* do not use this function in a driver */
71 static inline bool is_device_dma_coherent(struct device *dev)
75 return dev->archdata.dma_coherent;
78 #include <asm-generic/dma-mapping-common.h>
80 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
82 return (dma_addr_t)paddr;
85 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
87 return (phys_addr_t)dev_addr;
90 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
95 return addr + size - 1 <= *dev->dma_mask;
98 static inline void dma_mark_clean(void *addr, size_t size)
102 static inline void arch_flush_page(struct device *dev, const void *virt,
105 __dma_flush_range(virt, virt + PAGE_SIZE);
108 static inline void arch_dma_map_area(phys_addr_t phys, size_t size,
109 enum dma_data_direction dir)
111 __dma_map_area(phys_to_virt(phys), size, dir);
114 static inline void arch_dma_unmap_area(phys_addr_t phys, size_t size,
115 enum dma_data_direction dir)
117 __dma_unmap_area(phys_to_virt(phys), size, dir);
120 static inline pgprot_t arch_get_dma_pgprot(struct dma_attrs *attrs,
121 pgprot_t prot, bool coherent)
123 if (!coherent || dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
124 return pgprot_writecombine(prot);
128 extern void *arch_alloc_from_atomic_pool(size_t size, struct page **ret_page,
130 extern bool arch_in_atomic_pool(void *start, size_t size);
131 extern int arch_free_from_atomic_pool(void *start, size_t size);
133 #endif /* __KERNEL__ */
134 #endif /* __ASM_DMA_MAPPING_H */