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 #ifdef __tilegx__
  24 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
  25 #endif
  26
  27 extern struct dma_map_ops *tile_dma_map_ops;
  28 extern struct dma_map_ops *gx_pci_dma_map_ops;
  29 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
  30 extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
  31
  32 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  33 {
  34         if (dev && dev->archdata.dma_ops)
  35                 return dev->archdata.dma_ops;
  36         else
  37                 return tile_dma_map_ops;
  38 }
  39
  40 static inline dma_addr_t get_dma_offset(struct device *dev)
  41 {
  42         return dev->archdata.dma_offset;
  43 }
  44
  45 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
  46 {
  47         dev->archdata.dma_offset = off;
  48 }
  49
  50 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  51 {
  52         return paddr;
  53 }
  54
  55 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  56 {
  57         return daddr;
  58 }
  59
  60 static inline void dma_mark_clean(void *addr, size_t size) {}
  61
  62 #include <asm-generic/dma-mapping-common.h>
  63
  64 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  65 {
  66         dev->archdata.dma_ops = ops;
  67 }
  68
  69 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  70 {
  71         if (!dev->dma_mask)
  72                 return 0;
  73
  74         return addr + size - 1 <= *dev->dma_mask;
  75 }
  76
  77 static inline int
  78 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  79 {
  80         debug_dma_mapping_error(dev, dma_addr);
  81         return get_dma_ops(dev)->mapping_error(dev, dma_addr);
  82 }
  83
  84 static inline int
  85 dma_supported(struct device *dev, u64 mask)
  86 {
  87         return get_dma_ops(dev)->dma_supported(dev, mask);
  88 }
  89
  90 static inline int
  91 dma_set_mask(struct device *dev, u64 mask)
  92 {
  93         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  94
  95         /*
  96          * For PCI devices with 64-bit DMA addressing capability, promote
  97          * the dma_ops to hybrid, with the consistent memory DMA space limited
  98          * to 32-bit. For 32-bit capable devices, limit the streaming DMA
  99          * address range to max_direct_dma_addr.
 100          */
 101         if (dma_ops == gx_pci_dma_map_ops ||
 102             dma_ops == gx_hybrid_pci_dma_map_ops ||
 103             dma_ops == gx_legacy_pci_dma_map_ops) {
 104                 if (mask == DMA_BIT_MASK(64) &&
 105                     dma_ops == gx_legacy_pci_dma_map_ops)
 106                         set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
 107                 else if (mask > dev->archdata.max_direct_dma_addr)
 108                         mask = dev->archdata.max_direct_dma_addr;
 109         }
 110
 111         if (!dev->dma_mask || !dma_supported(dev, mask))
 112                 return -EIO;
 113
 114         *dev->dma_mask = mask;
 115
 116         return 0;
 117 }
 118
 119 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 120                                     dma_addr_t *dma_handle, gfp_t flag,
 121                                     struct dma_attrs *attrs)
 122 {
 123         struct dma_map_ops *dma_ops = get_dma_ops(dev);
 124         void *cpu_addr;
 125
 126         cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
 127
 128         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 129
 130         return cpu_addr;
 131 }
 132
 133 static inline void dma_free_attrs(struct device *dev, size_t size,
 134                                   void *cpu_addr, dma_addr_t dma_handle,
 135                                   struct dma_attrs *attrs)
 136 {
 137         struct dma_map_ops *dma_ops = get_dma_ops(dev);
 138
 139         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 140
 141         dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 142 }
 143
 144 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 145 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 146 #define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 147 #define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 148
 149 /*
 150  * dma_alloc_noncoherent() is #defined to return coherent memory,
 151  * so there's no need to do any flushing here.
 152  */
 153 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 154                                   enum dma_data_direction direction)
 155 {
 156 }
 157
 158 #endif /* _ASM_TILE_DMA_MAPPING_H */