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

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * OpenRISC implementation:
   9  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #ifndef __ASM_OPENRISC_DMA_MAPPING_H
  18 #define __ASM_OPENRISC_DMA_MAPPING_H
  19
  20 /*
  21  * See Documentation/DMA-API-HOWTO.txt and
  22  * Documentation/DMA-API.txt for documentation.
  23  */
  24
  25 #include <linux/dma-debug.h>
  26 #include <asm-generic/dma-coherent.h>
  27 #include <linux/kmemcheck.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  31
  32 extern struct dma_map_ops or1k_dma_map_ops;
  33
  34 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  35 {
  36         return &or1k_dma_map_ops;
  37 }
  38
  39 #include <asm-generic/dma-mapping-common.h>
  40
  41 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
  42
  43 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  44                                     dma_addr_t *dma_handle, gfp_t gfp,
  45                                     struct dma_attrs *attrs)
  46 {
  47         struct dma_map_ops *ops = get_dma_ops(dev);
  48         void *memory;
  49
  50         memory = ops->alloc(dev, size, dma_handle, gfp, attrs);
  51
  52         debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
  53
  54         return memory;
  55 }
  56
  57 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
  58
  59 static inline void dma_free_attrs(struct device *dev, size_t size,
  60                                   void *cpu_addr, dma_addr_t dma_handle,
  61                                   struct dma_attrs *attrs)
  62 {
  63         struct dma_map_ops *ops = get_dma_ops(dev);
  64
  65         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  66
  67         ops->free(dev, size, cpu_addr, dma_handle, attrs);
  68 }
  69
  70 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
  71                                           dma_addr_t *dma_handle, gfp_t gfp)
  72 {
  73         struct dma_attrs attrs;
  74
  75         dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
  76
  77         return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
  78 }
  79
  80 static inline void dma_free_noncoherent(struct device *dev, size_t size,
  81                                          void *cpu_addr, dma_addr_t dma_handle)
  82 {
  83         struct dma_attrs attrs;
  84
  85         dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
  86
  87         dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
  88 }
  89
  90 static inline int dma_supported(struct device *dev, u64 dma_mask)
  91 {
  92         /* Support 32 bit DMA mask exclusively */
  93         return dma_mask == DMA_BIT_MASK(32);
  94 }
  95
  96 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  97 {
  98         return 0;
  99 }
 100
 101 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 102 {
 103         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 104                 return -EIO;
 105
 106         *dev->dma_mask = dma_mask;
 107
 108         return 0;
 109 }
 110 #endif  /* __ASM_OPENRISC_DMA_MAPPING_H */