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         debug_dma_mapping_error(dev, dev_addr);
  54         return ops->mapping_error(dev, dev_addr);
  55 }
  56
  57 static inline int dma_supported(struct device *dev, u64 mask)
  58 {
  59         struct dma_map_ops *ops = get_dma_ops(dev);
  60         return ops->dma_supported(dev, mask);
  61 }
  62
  63 static inline int dma_set_mask(struct device *dev, u64 mask)
  64 {
  65         if (!dev->dma_mask || !dma_supported(dev, mask))
  66                 return -EIO;
  67         *dev->dma_mask = mask;
  68
  69         return 0;
  70 }
  71
  72 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  73 {
  74         if (!dev->dma_mask)
  75                 return 0;
  76
  77         return addr + size - 1 <= *dev->dma_mask;
  78 }
  79
  80 static inline void dma_mark_clean(void *addr, size_t size)
  81 {
  82 }
  83
  84 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  85                                        dma_addr_t *dma_handle, gfp_t flags)
  86 {
  87         struct dma_map_ops *ops = get_dma_ops(dev);
  88         void *vaddr;
  89
  90         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
  91                 return vaddr;
  92
  93         vaddr = ops->alloc(dev, size, dma_handle, flags, NULL);
  94         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
  95         return vaddr;
  96 }
  97
  98 static inline void dma_free_coherent(struct device *dev, size_t size,
  99                                      void *vaddr, dma_addr_t dev_addr)
 100 {
 101         struct dma_map_ops *ops = get_dma_ops(dev);
 102
 103         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 104                 return;
 105
 106         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 107         ops->free(dev, size, vaddr, dev_addr, NULL);
 108 }
 109
 110 /*
 111  * There is no dma_cache_sync() implementation, so just return NULL here.
 112  */
 113 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 114                                           dma_addr_t *handle, gfp_t flags)
 115 {
 116         return NULL;
 117 }
 118
 119 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 120                                         void *cpu_addr, dma_addr_t handle)
 121 {
 122 }
 123
 124 #endif  /* __KERNEL__ */
 125 #endif  /* __ASM_DMA_MAPPING_H */