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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6514 | serge | 1 | #ifndef _DMA_ATTR_H |
| 2 | #define _DMA_ATTR_H |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | #include |
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| 7 | |||
| 8 | /** |
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| 9 | * an enum dma_attr represents an attribute associated with a DMA |
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| 10 | * mapping. The semantics of each attribute should be defined in |
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| 11 | * Documentation/DMA-attributes.txt. |
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| 12 | */ |
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| 13 | enum dma_attr { |
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| 14 | DMA_ATTR_WRITE_BARRIER, |
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| 15 | DMA_ATTR_WEAK_ORDERING, |
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| 16 | DMA_ATTR_WRITE_COMBINE, |
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| 17 | DMA_ATTR_NON_CONSISTENT, |
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| 18 | DMA_ATTR_NO_KERNEL_MAPPING, |
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| 19 | DMA_ATTR_SKIP_CPU_SYNC, |
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| 20 | DMA_ATTR_FORCE_CONTIGUOUS, |
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| 21 | DMA_ATTR_MAX, |
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| 22 | }; |
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| 23 | |||
| 24 | #define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX) |
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| 25 | |||
| 26 | /** |
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| 27 | * struct dma_attrs - an opaque container for DMA attributes |
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| 28 | * @flags - bitmask representing a collection of enum dma_attr |
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| 29 | */ |
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| 30 | struct dma_attrs { |
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| 31 | unsigned long flags[__DMA_ATTRS_LONGS]; |
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| 32 | }; |
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| 33 | |||
| 34 | #define DEFINE_DMA_ATTRS(x) \ |
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| 35 | struct dma_attrs x = { \ |
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| 36 | .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 }, \ |
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| 37 | } |
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| 38 | |||
| 39 | static inline void init_dma_attrs(struct dma_attrs *attrs) |
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| 40 | { |
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| 41 | bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS); |
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| 42 | } |
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| 43 | |||
| 44 | /** |
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| 45 | * dma_set_attr - set a specific attribute |
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| 46 | * @attr: attribute to set |
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| 47 | * @attrs: struct dma_attrs (may be NULL) |
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| 48 | */ |
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| 49 | static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs) |
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| 50 | { |
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| 51 | if (attrs == NULL) |
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| 52 | return; |
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| 53 | BUG_ON(attr >= DMA_ATTR_MAX); |
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| 54 | __set_bit(attr, attrs->flags); |
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| 55 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * dma_get_attr - check for a specific attribute |
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| 59 | * @attr: attribute to set |
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| 60 | * @attrs: struct dma_attrs (may be NULL) |
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| 61 | */ |
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| 62 | static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs) |
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| 63 | { |
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| 64 | if (attrs == NULL) |
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| 65 | return 0; |
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| 66 | BUG_ON(attr >= DMA_ATTR_MAX); |
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| 67 | return test_bit(attr, attrs->flags); |
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| 68 | } |
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| 69 | |||
| 70 | #endif /* _DMA_ATTR_H */ |