projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 09b55412 CM |
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 | ||
| 58c8b269 SS |
24 | #include <xen/xen.h> |
| 25 | #include <asm/xen/hypervisor.h> | |
| 26 | ||
| 5299709d | 27 | extern const struct dma_map_ops dummy_dma_ops; |
| 09b55412 | 28 | |
| e0586326 | 29 | static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) |
| 09b55412 | 30 | { |
| b6197b93 | 31 | /* |
| 1dccb598 AB |
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. | |
| b6197b93 SS |
34 | */ |
| 35 | return &dummy_dma_ops; | |
| 09b55412 CM |
36 | } |
| 37 | ||
| 876945db | 38 | void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, |
| 53c92d79 | 39 | const struct iommu_ops *iommu, bool coherent); |
| 31dde116 | 40 | #define arch_setup_dma_ops arch_setup_dma_ops |
| 21890647 | 41 | |
| 876945db RM |
42 | #ifdef CONFIG_IOMMU_DMA |
| 43 | void arch_teardown_dma_ops(struct device *dev); | |
| 44 | #define arch_teardown_dma_ops arch_teardown_dma_ops | |
| 45 | #endif | |
| 46 | ||
| de7ee503 SS |
47 | /* do not use this function in a driver */ |
| 48 | static inline bool is_device_dma_coherent(struct device *dev) | |
| 49 | { | |
| 9d3bfbb4 CM |
50 | if (!dev) |
| 51 | return false; | |
| de7ee503 SS |
52 | return dev->archdata.dma_coherent; |
| 53 | } | |
| 54 | ||
| 09b55412 CM |
55 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 56 | { | |
| 1a9a0536 AG |
57 | dma_addr_t dev_addr = (dma_addr_t)paddr; |
| 58 | ||
| 59 | return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); | |
| 09b55412 CM |
60 | } |
| 61 | ||
| 62 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) | |
| 63 | { | |
| 1a9a0536 AG |
64 | phys_addr_t paddr = (phys_addr_t)dev_addr; |
| 65 | ||
| 66 | return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); | |
| 09b55412 CM |
67 | } |
| 68 | ||
| 09b55412 CM |
69 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 70 | { | |
| 71 | if (!dev->dma_mask) | |
| cc3979b5 | 72 | return false; |
| 09b55412 CM |
73 | |
| 74 | return addr + size - 1 <= *dev->dma_mask; | |
| 75 | } | |
| 76 | ||
| 77 | static inline void dma_mark_clean(void *addr, size_t size) | |
| 78 | { | |
| 79 | } | |
| 80 | ||
| 1a9a0536 AG |
81 | /* Override for dma_max_pfn() */ |
| 82 | static inline unsigned long dma_max_pfn(struct device *dev) | |
| 83 | { | |
| 84 | dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask; | |
| 85 | ||
| 86 | return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT; | |
| 87 | } | |
| 88 | #define dma_max_pfn(dev) dma_max_pfn(dev) | |
| 89 | ||
| 09b55412 CM |
90 | #endif /* __KERNEL__ */ |
| 91 | #endif /* __ASM_DMA_MAPPING_H */ |