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 extern struct dma_map_ops coherent_swiotlb_dma_ops;
  30 extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
  31
  32 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  33 {
  34         if (unlikely(!dev) || !dev->archdata.dma_ops)
  35                 return dma_ops;
  36         else
  37                 return dev->archdata.dma_ops;
  38 }
  39
  40 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  41 {
  42         dev->archdata.dma_ops = ops;
  43 }
  44
  45
  46 #include <asm-generic/dma-mapping-common.h>
  47
  48 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  49 {
  50         return (dma_addr_t)paddr;
  51 }
  52
  53 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  54 {
  55         return (phys_addr_t)dev_addr;
  56 }
  57
  58 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  59 {
  60         struct dma_map_ops *ops = get_dma_ops(dev);
  61         debug_dma_mapping_error(dev, dev_addr);
  62         return ops->mapping_error(dev, dev_addr);
  63 }
  64
  65 static inline int dma_supported(struct device *dev, u64 mask)
  66 {
  67         struct dma_map_ops *ops = get_dma_ops(dev);
  68         return ops->dma_supported(dev, mask);
  69 }
  70
  71 static inline int dma_set_mask(struct device *dev, u64 mask)
  72 {
  73         if (!dev->dma_mask || !dma_supported(dev, mask))
  74                 return -EIO;
  75         *dev->dma_mask = mask;
  76
  77         return 0;
  78 }
  79
  80 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  81 {
  82         if (!dev->dma_mask)
  83                 return 0;
  84
  85         return addr + size - 1 <= *dev->dma_mask;
  86 }
  87
  88 static inline void dma_mark_clean(void *addr, size_t size)
  89 {
  90 }
  91
  92 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  93                                        dma_addr_t *dma_handle, gfp_t flags)
  94 {
  95         struct dma_map_ops *ops = get_dma_ops(dev);
  96         void *vaddr;
  97
  98         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
  99                 return vaddr;
 100
 101         vaddr = ops->alloc(dev, size, dma_handle, flags, NULL);
 102         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 103         return vaddr;
 104 }
 105
 106 static inline void dma_free_coherent(struct device *dev, size_t size,
 107                                      void *vaddr, dma_addr_t dev_addr)
 108 {
 109         struct dma_map_ops *ops = get_dma_ops(dev);
 110
 111         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 112                 return;
 113
 114         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 115         ops->free(dev, size, vaddr, dev_addr, NULL);
 116 }
 117
 118 /*
 119  * There is no dma_cache_sync() implementation, so just return NULL here.
 120  */
 121 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 122                                           dma_addr_t *handle, gfp_t flags)
 123 {
 124         return NULL;
 125 }
 126
 127 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 128                                         void *cpu_addr, dma_addr_t handle)
 129 {
 130 }
 131
 132 #endif  /* __KERNEL__ */
 133 #endif  /* __ASM_DMA_MAPPING_H */