text: /*
   * Copyright (C) 2012 ARM Ltd.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  #ifndef __ASM_DMA_MAPPING_H
  #define __ASM_DMA_MAPPING_H
  
  #ifdef __KERNEL__
  
  #include <linux/types.h>
  #include <linux/vmalloc.h>
  
  #include <xen/xen.h>
  #include <asm/xen/hypervisor.h>
  
  extern const struct dma_map_ops dummy_dma_ops;
  
  static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  {
  	/*
  	 * We expect no ISA devices, and all other DMA masters are expected to
  	 * have someone call arch_setup_dma_ops at device creation time.
  	 */
  	return &dummy_dma_ops;
  }
  
  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  			const struct iommu_ops *iommu, bool coherent);
  #define arch_setup_dma_ops	arch_setup_dma_ops
  
  #ifdef CONFIG_IOMMU_DMA
  void arch_teardown_dma_ops(struct device *dev);
  #define arch_teardown_dma_ops	arch_teardown_dma_ops
  #endif
  
  /* do not use this function in a driver */
  static inline bool is_device_dma_coherent(struct device *dev)
  {
  	return dev->archdata.dma_coherent;
  }
  
  #endif	/* __KERNEL__ */
  #endif	/* __ASM_DMA_MAPPING_H */
  