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 #include <xen/xen.h>
  27 #include <asm/xen/hypervisor.h>
  28
  29 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
  30
  31 #define DMA_ERROR_CODE  (~(dma_addr_t)0)
  32 extern struct dma_map_ops *dma_ops;
  33
  34 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  35 {
  36         if (unlikely(!dev) || !dev->archdata.dma_ops)
  37                 return dma_ops;
  38         else
  39                 return dev->archdata.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 #include <asm-generic/dma-mapping-common.h>
  51
  52 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  53 {
  54         return (dma_addr_t)paddr;
  55 }
  56
  57 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  58 {
  59         return (phys_addr_t)dev_addr;
  60 }
  61
  62 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  63 {
  64         struct dma_map_ops *ops = get_dma_ops(dev);
  65         debug_dma_mapping_error(dev, dev_addr);
  66         return ops->mapping_error(dev, dev_addr);
  67 }
  68
  69 static inline int dma_supported(struct device *dev, u64 mask)
  70 {
  71         struct dma_map_ops *ops = get_dma_ops(dev);
  72         return ops->dma_supported(dev, mask);
  73 }
  74
  75 static inline int dma_set_mask(struct device *dev, u64 mask)
  76 {
  77         if (!dev->dma_mask || !dma_supported(dev, mask))
  78                 return -EIO;
  79         *dev->dma_mask = mask;
  80
  81         return 0;
  82 }
  83
  84 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  85 {
  86         if (!dev->dma_mask)
  87                 return 0;
  88
  89         return addr + size - 1 <= *dev->dma_mask;
  90 }
  91
  92 static inline void dma_mark_clean(void *addr, size_t size)
  93 {
  94 }
  95
  96 #define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
  97 #define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
  98
  99 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 100                                     dma_addr_t *dma_handle, gfp_t flags,
 101                                     struct dma_attrs *attrs)
 102 {
 103         struct dma_map_ops *ops = get_dma_ops(dev);
 104         void *vaddr;
 105
 106         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
 107                 return vaddr;
 108
 109         vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
 110         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 111         return vaddr;
 112 }
 113
 114 static inline void dma_free_attrs(struct device *dev, size_t size,
 115                                   void *vaddr, dma_addr_t dev_addr,
 116                                   struct dma_attrs *attrs)
 117 {
 118         struct dma_map_ops *ops = get_dma_ops(dev);
 119
 120         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 121                 return;
 122
 123         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 124         ops->free(dev, size, vaddr, dev_addr, attrs);
 125 }
 126
 127 /*
 128  * There is no dma_cache_sync() implementation, so just return NULL here.
 129  */
 130 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 131                                           dma_addr_t *handle, gfp_t flags)
 132 {
 133         return NULL;
 134 }
 135
 136 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 137                                         void *cpu_addr, dma_addr_t handle)
 138 {
 139 }
 140
 141 #endif  /* __KERNEL__ */
 142 #endif  /* __ASM_DMA_MAPPING_H */