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 <asm/io.h>
  30
  31 struct device;
  32 extern int bad_dma_address;
  33 #define DMA_ERROR_CODE bad_dma_address
  34
  35 extern struct dma_map_ops *dma_ops;
  36
  37 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  38 {
  39         if (unlikely(dev == NULL))
  40                 return NULL;
  41
  42         return dma_ops;
  43 }
  44
  45 #define HAVE_ARCH_DMA_SUPPORTED 1
  46 extern int dma_supported(struct device *dev, u64 mask);
  47 extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
  48 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  49                            enum dma_data_direction direction);
  50
  51 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  52 {
  53         if (!dev->dma_mask)
  54                 return 0;
  55         return addr + size - 1 <= *dev->dma_mask;
  56 }
  57
  58 #endif