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

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C++ Header · 143 lines · 106 code · 28 blank · 9 comment · 6 complexity · f9fc5a8c46c55a39983034b73218b821 MD5 · raw file 

    

  1. #ifndef _ASM_DMA_MAPPING_H
    2. 

  2. #define _ASM_DMA_MAPPING_H
    3. 

  3. 

  4. #include <linux/device.h>
    5. 

  5. #include <asm/cache.h>
    6. 

  6. #include <asm/cacheflush.h>
    7. 

  7. #include <asm/scatterlist.h>
    8. 

  8. #include <asm/io.h>
    9. 

  9. 

  10. /*
    11. 

  11.  * See Documentation/DMA-API.txt for the description of how the
    12. 

  12.  * following DMA API should work.
    13. 

  13.  */
    14. 

  14. 

  15. #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
    16. 

  16. #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
    17. 

  17. 

  18. extern unsigned long __nongprelbss dma_coherent_mem_start;
    19. 

  19. extern unsigned long __nongprelbss dma_coherent_mem_end;
    20. 

  20. 

  21. void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
    22. 

  22. void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle);
    23. 

  23. 

  24. extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
    25. 

  25. 				 enum dma_data_direction direction);
    26. 

  26. 

  27. static inline
    28. 

  28. void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
    29. 

  29. 		      enum dma_data_direction direction)
    30. 

  30. {
    31. 

  31. 	BUG_ON(direction == DMA_NONE);
    32. 

  32. }
    33. 

  33. 

  34. extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
    35. 

  35. 		      enum dma_data_direction direction);
    36. 

  36. 

  37. static inline
    38. 

  38. void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
    39. 

  39. 	     enum dma_data_direction direction)
    40. 

  40. {
    41. 

  41. 	BUG_ON(direction == DMA_NONE);
    42. 

  42. }
    43. 

  43. 

  44. extern
    45. 

  45. dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
    46. 

  46. 			size_t size, enum dma_data_direction direction);
    47. 

  47. 

  48. static inline
    49. 

  49. void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
    50. 

  50. 		    enum dma_data_direction direction)
    51. 

  51. {
    52. 

  52. 	BUG_ON(direction == DMA_NONE);
    53. 

  53. }
    54. 

  54. 

  55. 

  56. static inline
    57. 

  57. void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
    58. 

  58. 			     enum dma_data_direction direction)
    59. 

  59. {
    60. 

  60. }
    61. 

  61. 

  62. static inline
    63. 

  63. void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
    64. 

  64. 				enum dma_data_direction direction)
    65. 

  65. {
    66. 

  66. 	flush_write_buffers();
    67. 

  67. }
    68. 

  68. 

  69. static inline
    70. 

  70. void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
    71. 

  71. 				   unsigned long offset, size_t size,
    72. 

  72. 				   enum dma_data_direction direction)
    73. 

  73. {
    74. 

  74. }
    75. 

  75. 

  76. static inline
    77. 

  77. void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
    78. 

  78. 				      unsigned long offset, size_t size,
    79. 

  79. 				      enum dma_data_direction direction)
    80. 

  80. {
    81. 

  81. 	flush_write_buffers();
    82. 

  82. }
    83. 

  83. 

  84. static inline
    85. 

  85. void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
    86. 

  86. 			 enum dma_data_direction direction)
    87. 

  87. {
    88. 

  88. }
    89. 

  89. 

  90. static inline
    91. 

  91. void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
    92. 

  92. 			    enum dma_data_direction direction)
    93. 

  93. {
    94. 

  94. 	flush_write_buffers();
    95. 

  95. }
    96. 

  96. 

  97. static inline
    98. 

  98. int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
    99. 

  99. {
    100. 

  100. 	return 0;
    101. 

  101. }
    102. 

  102. 

  103. static inline
    104. 

  104. int dma_supported(struct device *dev, u64 mask)
    105. 

  105. {
    106. 

  106.         /*
    107. 

  107.          * we fall back to GFP_DMA when the mask isn't all 1s,
    108. 

  108.          * so we can't guarantee allocations that must be
    109. 

  109.          * within a tighter range than GFP_DMA..
    110. 

  110.          */
    111. 

  111.         if (mask < 0x00ffffff)
    112. 

  112.                 return 0;
    113. 

  113. 

  114. 	return 1;
    115. 

  115. }
    116. 

  116. 

  117. static inline
    118. 

  118. int dma_set_mask(struct device *dev, u64 mask)
    119. 

  119. {
    120. 

  120. 	if (!dev->dma_mask || !dma_supported(dev, mask))
    121. 

  121. 		return -EIO;
    122. 

  122. 

  123. 	*dev->dma_mask = mask;
    124. 

  124. 

  125. 	return 0;
    126. 

  126. }
    127. 

  127. 

  128. static inline
    129. 

  129. int dma_get_cache_alignment(void)
    130. 

  130. {
    131. 

  131. 	return 1 << L1_CACHE_SHIFT;
    132. 

  132. }
    133. 

  133. 

  134. #define dma_is_consistent(d, h)	(1)
    135. 

  135. 

  136. static inline
    137. 

  137. void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
    138. 

  138. 		    enum dma_data_direction direction)
    139. 

  139. {
    140. 

  140. 	flush_write_buffers();
    141. 

  141. }
    142. 

  142. 

  143. #endif  /* _ASM_DMA_MAPPING_H */
    144.