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 #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                         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 */