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 const struct dma_map_ops dummy_dma_ops;
  29
  30 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  31 {
  32         /*
  33          * We expect no ISA devices, and all other DMA masters are expected to
  34          * have someone call arch_setup_dma_ops at device creation time.
  35          */
  36         return &dummy_dma_ops;
  37 }
  38
  39 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  40                         const struct iommu_ops *iommu, bool coherent);
  41 #define arch_setup_dma_ops      arch_setup_dma_ops
  42
  43 #ifdef CONFIG_IOMMU_DMA
  44 void arch_teardown_dma_ops(struct device *dev);
  45 #define arch_teardown_dma_ops   arch_teardown_dma_ops
  46 #endif
  47
  48 /* do not use this function in a driver */
  49 static inline bool is_device_dma_coherent(struct device *dev)
  50 {
  51         if (!dev)
  52                 return false;
  53         return dev->archdata.dma_coherent;
  54 }
  55
  56 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  57 {
  58         dma_addr_t dev_addr = (dma_addr_t)paddr;
  59
  60         return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  61 }
  62
  63 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  64 {
  65         phys_addr_t paddr = (phys_addr_t)dev_addr;
  66
  67         return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  68 }
  69
  70 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  71 {
  72         if (!dev->dma_mask)
  73                 return false;
  74
  75         return addr + size - 1 <= *dev->dma_mask;
  76 }
  77
  78 static inline void dma_mark_clean(void *addr, size_t size)
  79 {
  80 }
  81
  82 /* Override for dma_max_pfn() */
  83 static inline unsigned long dma_max_pfn(struct device *dev)
  84 {
  85         dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
  86
  87         return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
  88 }
  89 #define dma_max_pfn(dev) dma_max_pfn(dev)
  90
  91 #endif  /* __KERNEL__ */
  92 #endif  /* __ASM_DMA_MAPPING_H */