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/acpi.h>
22 #include <linux/types.h>
23 #include <linux/vmalloc.h>
26 #include <asm/xen/hypervisor.h>
28 #define DMA_ERROR_CODE (~(dma_addr_t)0)
29 extern struct dma_map_ops *dma_ops;
30 extern struct dma_map_ops dummy_dma_ops;
32 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
36 else if (dev->archdata.dma_ops)
37 return dev->archdata.dma_ops;
38 else if (acpi_disabled)
42 * When ACPI is enabled, if arch_set_dma_ops is not called,
43 * we will disable device DMA capability by setting it
46 return &dummy_dma_ops;
49 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
51 if (xen_initial_domain())
54 return __generic_dma_ops(dev);
57 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
58 struct iommu_ops *iommu, bool coherent);
59 #define arch_setup_dma_ops arch_setup_dma_ops
61 #ifdef CONFIG_IOMMU_DMA
62 void arch_teardown_dma_ops(struct device *dev);
63 #define arch_teardown_dma_ops arch_teardown_dma_ops
66 /* do not use this function in a driver */
67 static inline bool is_device_dma_coherent(struct device *dev)
71 return dev->archdata.dma_coherent;
74 #include <asm-generic/dma-mapping-common.h>
76 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
78 return (dma_addr_t)paddr;
81 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
83 return (phys_addr_t)dev_addr;
86 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
91 return addr + size - 1 <= *dev->dma_mask;
94 static inline void dma_mark_clean(void *addr, size_t size)
98 #endif /* __KERNEL__ */
99 #endif /* __ASM_DMA_MAPPING_H */