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

   1 /*
   2  * DMA operations for the Hexagon architecture
   3  *
   4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA.
  19  */
  20
  21 #ifndef _ASM_DMA_MAPPING_H
  22 #define _ASM_DMA_MAPPING_H
  23
  24 #include <linux/types.h>
  25 #include <linux/cache.h>
  26 #include <linux/mm.h>
  27 #include <linux/scatterlist.h>
  28 #include <linux/dma-debug.h>
  29 #include <linux/dma-attrs.h>
  30 #include <asm/io.h>
  31
  32 struct device;
  33 extern int bad_dma_address;
  34
  35 extern struct dma_map_ops *dma_ops;
  36
  37 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  38 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  39
  40 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  41 {
  42         if (unlikely(dev == NULL))
  43                 return NULL;
  44
  45         return dma_ops;
  46 }
  47
  48 extern int dma_supported(struct device *dev, u64 mask);
  49 extern int dma_set_mask(struct device *dev, u64 mask);
  50 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
  51 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  52                            enum dma_data_direction direction);
  53
  54 #include <asm-generic/dma-mapping-common.h>
  55
  56 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  57 {
  58         if (!dev->dma_mask)
  59                 return 0;
  60         return addr + size - 1 <= *dev->dma_mask;
  61 }
  62
  63 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  64 {
  65         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  66
  67         if (dma_ops->mapping_error)
  68                 return dma_ops->mapping_error(dev, dma_addr);
  69
  70         return (dma_addr == bad_dma_address);
  71 }
  72
  73 #define dma_alloc_coherent(d,s,h,f)     dma_alloc_attrs(d,s,h,f,NULL)
  74
  75 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  76                                     dma_addr_t *dma_handle, gfp_t flag,
  77                                     struct dma_attrs *attrs)
  78 {
  79         void *ret;
  80         struct dma_map_ops *ops = get_dma_ops(dev);
  81
  82         BUG_ON(!dma_ops);
  83
  84         ret = ops->alloc(dev, size, dma_handle, flag, attrs);
  85
  86         debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
  87
  88         return ret;
  89 }
  90
  91 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
  92
  93 static inline void dma_free_attrs(struct device *dev, size_t size,
  94                                   void *cpu_addr, dma_addr_t dma_handle,
  95                                   struct dma_attrs *attrs)
  96 {
  97         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  98
  99         BUG_ON(!dma_ops);
 100
 101         dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 102
 103         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 104 }
 105
 106 #endif