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-mapping.h>
  29 #include <linux/dma-debug.h>
  30 #include <linux/dma-attrs.h>
  31 #include <asm/io.h>
  32
  33 struct device;
  34 extern int bad_dma_address;
  35
  36 extern struct dma_map_ops *dma_ops;
  37
  38 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  39 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  40
  41 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  42 {
  43         if (unlikely(dev == NULL))
  44                 return NULL;
  45
  46         return dma_ops;
  47 }
  48
  49 extern int dma_supported(struct device *dev, u64 mask);
  50 extern int dma_set_mask(struct device *dev, u64 mask);
  51 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
  52 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  53                            enum dma_data_direction direction);
  54
  55 #include <asm-generic/dma-mapping-common.h>
  56
  57 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  58 {
  59         if (!dev->dma_mask)
  60                 return 0;
  61         return addr + size - 1 <= *dev->dma_mask;
  62 }
  63
  64 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  65 {
  66         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  67
  68         if (dma_ops->mapping_error)
  69                 return dma_ops->mapping_error(dev, dma_addr);
  70
  71         return (dma_addr == bad_dma_address);
  72 }
  73
  74 #define dma_alloc_coherent(d,s,h,f)     dma_alloc_attrs(d,s,h,f,NULL)
  75
  76 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  77                                     dma_addr_t *dma_handle, gfp_t flag,
  78                                     struct dma_attrs *attrs)
  79 {
  80         void *ret;
  81         struct dma_map_ops *ops = get_dma_ops(dev);
  82
  83         BUG_ON(!dma_ops);
  84
  85         ret = ops->alloc(dev, size, dma_handle, flag, attrs);
  86
  87         debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
  88
  89         return ret;
  90 }
  91
  92 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
  93
  94 static inline void dma_free_attrs(struct device *dev, size_t size,
  95                                   void *cpu_addr, dma_addr_t dma_handle,
  96                                   struct dma_attrs *attrs)
  97 {
  98         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  99
 100         BUG_ON(!dma_ops);
 101
 102         dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 103
 104         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 105 }
 106
 107 #endif