arch/tile/include/asm/dma-mapping.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_DMA_MAPPING_H
  16 #define _ASM_TILE_DMA_MAPPING_H
  17
  18 #include <linux/mm.h>
  19 #include <linux/scatterlist.h>
  20 #include <linux/cache.h>
  21 #include <linux/io.h>
  22
  23 extern struct dma_map_ops *tile_dma_map_ops;
  24 extern struct dma_map_ops *gx_pci_dma_map_ops;
  25 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
  26
  27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  28 {
  29         if (dev && dev->archdata.dma_ops)
  30                 return dev->archdata.dma_ops;
  31         else
  32                 return tile_dma_map_ops;
  33 }
  34
  35 static inline dma_addr_t get_dma_offset(struct device *dev)
  36 {
  37         return dev->archdata.dma_offset;
  38 }
  39
  40 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
  41 {
  42         dev->archdata.dma_offset = off;
  43 }
  44
  45 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  46 {
  47         return paddr + get_dma_offset(dev);
  48 }
  49
  50 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  51 {
  52         return daddr - get_dma_offset(dev);
  53 }
  54
  55 static inline void dma_mark_clean(void *addr, size_t size) {}
  56
  57 #include <asm-generic/dma-mapping-common.h>
  58
  59 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  60 {
  61         dev->archdata.dma_ops = ops;
  62 }
  63
  64 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  65 {
  66         if (!dev->dma_mask)
  67                 return 0;
  68
  69         return addr + size - 1 <= *dev->dma_mask;
  70 }
  71
  72 static inline int
  73 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  74 {
  75         debug_dma_mapping_error(dev, dma_addr);
  76         return get_dma_ops(dev)->mapping_error(dev, dma_addr);
  77 }
  78
  79 static inline int
  80 dma_supported(struct device *dev, u64 mask)
  81 {
  82         return get_dma_ops(dev)->dma_supported(dev, mask);
  83 }
  84
  85 static inline int
  86 dma_set_mask(struct device *dev, u64 mask)
  87 {
  88         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  89
  90         /* Handle legacy PCI devices with limited memory addressability. */
  91         if ((dma_ops == gx_pci_dma_map_ops) && (mask <= DMA_BIT_MASK(32))) {
  92                 set_dma_ops(dev, gx_legacy_pci_dma_map_ops);
  93                 set_dma_offset(dev, 0);
  94                 if (mask > dev->archdata.max_direct_dma_addr)
  95                         mask = dev->archdata.max_direct_dma_addr;
  96         }
  97
  98         if (!dev->dma_mask || !dma_supported(dev, mask))
  99                 return -EIO;
 100
 101         *dev->dma_mask = mask;
 102
 103         return 0;
 104 }
 105
 106 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 107                                     dma_addr_t *dma_handle, gfp_t flag,
 108                                     struct dma_attrs *attrs)
 109 {
 110         struct dma_map_ops *dma_ops = get_dma_ops(dev);
 111         void *cpu_addr;
 112
 113         cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
 114
 115         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 116
 117         return cpu_addr;
 118 }
 119
 120 static inline void dma_free_attrs(struct device *dev, size_t size,
 121                                   void *cpu_addr, dma_addr_t dma_handle,
 122                                   struct dma_attrs *attrs)
 123 {
 124         struct dma_map_ops *dma_ops = get_dma_ops(dev);
 125
 126         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 127
 128         dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 129 }
 130
 131 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 132 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 133 #define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 134 #define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 135
 136 /*
 137  * dma_alloc_noncoherent() is #defined to return coherent memory,
 138  * so there's no need to do any flushing here.
 139  */
 140 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 141                                   enum dma_data_direction direction)
 142 {
 143 }
 144
 145 #endif /* _ASM_TILE_DMA_MAPPING_H */