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/xen/hypervisor.h>
27 #define DMA_ERROR_CODE (~(dma_addr_t)0)
28 extern const struct dma_map_ops dummy_dma_ops;
30 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
33 * We expect no ISA devices, and all other DMA masters are expected to
34 * have someone call arch_setup_dma_ops at device creation time.
36 return &dummy_dma_ops;
39 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
40 const struct iommu_ops *iommu, bool coherent);
41 #define arch_setup_dma_ops arch_setup_dma_ops
43 #ifdef CONFIG_IOMMU_DMA
44 void arch_teardown_dma_ops(struct device *dev);
45 #define arch_teardown_dma_ops arch_teardown_dma_ops
48 /* do not use this function in a driver */
49 static inline bool is_device_dma_coherent(struct device *dev)
51 return dev->archdata.dma_coherent;
54 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
56 dma_addr_t dev_addr = (dma_addr_t)paddr;
58 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
61 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
63 phys_addr_t paddr = (phys_addr_t)dev_addr;
65 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
68 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
73 return addr + size - 1 <= *dev->dma_mask;
76 static inline void dma_mark_clean(void *addr, size_t size)
80 /* Override for dma_max_pfn() */
81 static inline unsigned long dma_max_pfn(struct device *dev)
83 dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
85 return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
87 #define dma_max_pfn(dev) dma_max_pfn(dev)
89 #endif /* __KERNEL__ */
90 #endif /* __ASM_DMA_MAPPING_H */