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 <asm-generic/dma-coherent.h>
  25
  26 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
  27
  28 extern struct dma_map_ops *dma_ops;
  29
  30 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  31 {
  32         if (unlikely(!dev) || !dev->archdata.dma_ops)
  33                 return dma_ops;
  34         else
  35                 return dev->archdata.dma_ops;
  36 }
  37
  38 #include <asm-generic/dma-mapping-common.h>
  39
  40 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  41 {
  42         return (dma_addr_t)paddr;
  43 }
  44
  45 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  46 {
  47         return (phys_addr_t)dev_addr;
  48 }
  49
  50 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  51 {
  52         struct dma_map_ops *ops = get_dma_ops(dev);
  53         return ops->mapping_error(dev, dev_addr);
  54 }
  55
  56 static inline int dma_supported(struct device *dev, u64 mask)
  57 {
  58         struct dma_map_ops *ops = get_dma_ops(dev);
  59         return ops->dma_supported(dev, mask);
  60 }
  61
  62 static inline int dma_set_mask(struct device *dev, u64 mask)
  63 {
  64         if (!dev->dma_mask || !dma_supported(dev, mask))
  65                 return -EIO;
  66         *dev->dma_mask = mask;
  67
  68         return 0;
  69 }
  70
  71 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  72 {
  73         if (!dev->dma_mask)
  74                 return 0;
  75
  76         return addr + size - 1 <= *dev->dma_mask;
  77 }
  78
  79 static inline void dma_mark_clean(void *addr, size_t size)
  80 {
  81 }
  82
  83 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  84                                        dma_addr_t *dma_handle, gfp_t flags)
  85 {
  86         struct dma_map_ops *ops = get_dma_ops(dev);
  87         void *vaddr;
  88
  89         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
  90                 return vaddr;
  91
  92         vaddr = ops->alloc(dev, size, dma_handle, flags, NULL);
  93         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
  94         return vaddr;
  95 }
  96
  97 static inline void dma_free_coherent(struct device *dev, size_t size,
  98                                      void *vaddr, dma_addr_t dev_addr)
  99 {
 100         struct dma_map_ops *ops = get_dma_ops(dev);
 101
 102         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 103                 return;
 104
 105         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 106         ops->free(dev, size, vaddr, dev_addr, NULL);
 107 }
 108
 109 /*
 110  * There is no dma_cache_sync() implementation, so just return NULL here.
 111  */
 112 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 113                                           dma_addr_t *handle, gfp_t flags)
 114 {
 115         return NULL;
 116 }
 117
 118 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 119                                         void *cpu_addr, dma_addr_t handle)
 120 {
 121 }
 122
 123 #endif  /* __KERNEL__ */
 124 #endif  /* __ASM_DMA_MAPPING_H */