LXR linux/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
  32struct device;
  33extern int bad_dma_address;
  34
  35extern 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
  40static 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
  48extern int dma_supported(struct device *dev, u64 mask);
  49extern int dma_set_mask(struct device *dev, u64 mask);
  50extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
  51extern 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
  56static 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
  63static 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
  75static 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
  93static 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
 107