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

   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 extern const struct dma_map_ops dummy_dma_ops;
  28
  29 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  30 {
  31         /*
  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.
  34          */
  35         return &dummy_dma_ops;
  36 }
  37
  38 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  39                         const struct iommu_ops *iommu, bool coherent);
  40 #define arch_setup_dma_ops      arch_setup_dma_ops
  41
  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
  47 /* do not use this function in a driver */
  48 static inline bool is_device_dma_coherent(struct device *dev)
  49 {
  50         return dev->archdata.dma_coherent;
  51 }
  52
  53 #endif  /* __KERNEL__ */
  54 #endif  /* __ASM_DMA_MAPPING_H */