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/acpi.h>
  22 #include <linux/types.h>
  23 #include <linux/vmalloc.h>
  24
  25 #include <asm-generic/dma-coherent.h>
  26
  27 #include <xen/xen.h>
  28 #include <asm/xen/hypervisor.h>
  29
  30 #define DMA_ERROR_CODE  (~(dma_addr_t)0)
  31 extern struct dma_map_ops *dma_ops;
  32 extern struct dma_map_ops dummy_dma_ops;
  33
  34 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  35 {
  36         if (unlikely(!dev))
  37                 return dma_ops;
  38         else if (dev->archdata.dma_ops)
  39                 return dev->archdata.dma_ops;
  40         else if (acpi_disabled)
  41                 return dma_ops;
  42
  43         /*
  44          * When ACPI is enabled, if arch_set_dma_ops is not called,
  45          * we will disable device DMA capability by setting it
  46          * to dummy_dma_ops.
  47          */
  48         return &dummy_dma_ops;
  49 }
  50
  51 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  52 {
  53         if (xen_initial_domain())
  54                 return xen_dma_ops;
  55         else
  56                 return __generic_dma_ops(dev);
  57 }
  58
  59 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  60                                       struct iommu_ops *iommu, bool coherent)
  61 {
  62         if (!acpi_disabled && !dev->archdata.dma_ops)
  63                 dev->archdata.dma_ops = dma_ops;
  64
  65         dev->archdata.dma_coherent = coherent;
  66 }
  67 #define arch_setup_dma_ops      arch_setup_dma_ops
  68
  69 /* do not use this function in a driver */
  70 static inline bool is_device_dma_coherent(struct device *dev)
  71 {
  72         if (!dev)
  73                 return false;
  74         return dev->archdata.dma_coherent;
  75 }
  76
  77 #include <asm-generic/dma-mapping-common.h>
  78
  79 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  80 {
  81         return (dma_addr_t)paddr;
  82 }
  83
  84 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  85 {
  86         return (phys_addr_t)dev_addr;
  87 }
  88
  89 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  90 {
  91         struct dma_map_ops *ops = get_dma_ops(dev);
  92         debug_dma_mapping_error(dev, dev_addr);
  93         return ops->mapping_error(dev, dev_addr);
  94 }
  95
  96 static inline int dma_supported(struct device *dev, u64 mask)
  97 {
  98         struct dma_map_ops *ops = get_dma_ops(dev);
  99         return ops->dma_supported(dev, mask);
 100 }
 101
 102 static inline int dma_set_mask(struct device *dev, u64 mask)
 103 {
 104         if (!dev->dma_mask || !dma_supported(dev, mask))
 105                 return -EIO;
 106         *dev->dma_mask = mask;
 107
 108         return 0;
 109 }
 110
 111 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 112 {
 113         if (!dev->dma_mask)
 114                 return false;
 115
 116         return addr + size - 1 <= *dev->dma_mask;
 117 }
 118
 119 static inline void dma_mark_clean(void *addr, size_t size)
 120 {
 121 }
 122
 123 #define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
 124 #define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
 125
 126 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 127                                     dma_addr_t *dma_handle, gfp_t flags,
 128                                     struct dma_attrs *attrs)
 129 {
 130         struct dma_map_ops *ops = get_dma_ops(dev);
 131         void *vaddr;
 132
 133         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
 134                 return vaddr;
 135
 136         vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
 137         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 138         return vaddr;
 139 }
 140
 141 static inline void dma_free_attrs(struct device *dev, size_t size,
 142                                   void *vaddr, dma_addr_t dev_addr,
 143                                   struct dma_attrs *attrs)
 144 {
 145         struct dma_map_ops *ops = get_dma_ops(dev);
 146
 147         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 148                 return;
 149
 150         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 151         ops->free(dev, size, vaddr, dev_addr, attrs);
 152 }
 153
 154 /*
 155  * There is no dma_cache_sync() implementation, so just return NULL here.
 156  */
 157 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 158                                           dma_addr_t *handle, gfp_t flags)
 159 {
 160         return NULL;
 161 }
 162
 163 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 164                                         void *cpu_addr, dma_addr_t handle)
 165 {
 166 }
 167
 168 #endif  /* __KERNEL__ */
 169 #endif  /* __ASM_DMA_MAPPING_H */