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Linux/arch/arm64/include/asm/dma-mapping.h

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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                         const 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 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 68 {
 69         return (dma_addr_t)paddr;
 70 }
 71 
 72 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 73 {
 74         return (phys_addr_t)dev_addr;
 75 }
 76 
 77 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 78 {
 79         if (!dev->dma_mask)
 80                 return false;
 81 
 82         return addr + size - 1 <= *dev->dma_mask;
 83 }
 84 
 85 static inline void dma_mark_clean(void *addr, size_t size)
 86 {
 87 }
 88 
 89 #endif  /* __KERNEL__ */
 90 #endif  /* __ASM_DMA_MAPPING_H */
 91 

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