Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
12d04eef | 2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation |
1da177e4 | 3 | * |
12d04eef | 4 | * Provide default implementations of the DMA mapping callbacks for |
8dd0e952 | 5 | * directly mapped busses. |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/device.h> | |
9 | #include <linux/dma-mapping.h> | |
80d3e8ab | 10 | #include <linux/dma-debug.h> |
b2f2e8fe | 11 | #include <linux/lmb.h> |
1da177e4 | 12 | #include <asm/bug.h> |
12d04eef | 13 | #include <asm/abs_addr.h> |
1da177e4 | 14 | |
12d04eef BH |
15 | /* |
16 | * Generic direct DMA implementation | |
92b20c40 | 17 | * |
31d1b493 ME |
18 | * This implementation supports a per-device offset that can be applied if |
19 | * the address at which memory is visible to devices is not 0. Platform code | |
20 | * can set archdata.dma_data to an unsigned long holding the offset. By | |
4fc665b8 | 21 | * default the offset is PCI_DRAM_OFFSET. |
12d04eef | 22 | */ |
5d33eebe | 23 | |
35e4a6e2 | 24 | |
4fc665b8 BB |
25 | void *dma_direct_alloc_coherent(struct device *dev, size_t size, |
26 | dma_addr_t *dma_handle, gfp_t flag) | |
12d04eef | 27 | { |
8aa26590 | 28 | void *ret; |
4fc665b8 | 29 | #ifdef CONFIG_NOT_COHERENT_CACHE |
8b31e49d | 30 | ret = __dma_alloc_coherent(dev, size, dma_handle, flag); |
8aa26590 BH |
31 | if (ret == NULL) |
32 | return NULL; | |
1cebd7a0 | 33 | *dma_handle += get_dma_offset(dev); |
8aa26590 | 34 | return ret; |
4fc665b8 | 35 | #else |
c80d9133 | 36 | struct page *page; |
8fae0353 | 37 | int node = dev_to_node(dev); |
12d04eef | 38 | |
4fc665b8 BB |
39 | /* ignore region specifiers */ |
40 | flag &= ~(__GFP_HIGHMEM); | |
41 | ||
c80d9133 BH |
42 | page = alloc_pages_node(node, flag, get_order(size)); |
43 | if (page == NULL) | |
44 | return NULL; | |
45 | ret = page_address(page); | |
46 | memset(ret, 0, size); | |
1cebd7a0 | 47 | *dma_handle = virt_to_abs(ret) + get_dma_offset(dev); |
c80d9133 | 48 | |
12d04eef | 49 | return ret; |
4fc665b8 | 50 | #endif |
1da177e4 | 51 | } |
1da177e4 | 52 | |
4fc665b8 BB |
53 | void dma_direct_free_coherent(struct device *dev, size_t size, |
54 | void *vaddr, dma_addr_t dma_handle) | |
1da177e4 | 55 | { |
4fc665b8 BB |
56 | #ifdef CONFIG_NOT_COHERENT_CACHE |
57 | __dma_free_coherent(size, vaddr); | |
58 | #else | |
12d04eef | 59 | free_pages((unsigned long)vaddr, get_order(size)); |
4fc665b8 | 60 | #endif |
1da177e4 | 61 | } |
1da177e4 | 62 | |
78bdc310 | 63 | static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, |
3affedc4 MN |
64 | int nents, enum dma_data_direction direction, |
65 | struct dma_attrs *attrs) | |
1da177e4 | 66 | { |
78bdc310 | 67 | struct scatterlist *sg; |
12d04eef | 68 | int i; |
1da177e4 | 69 | |
78bdc310 | 70 | for_each_sg(sgl, sg, nents, i) { |
1cebd7a0 | 71 | sg->dma_address = sg_phys(sg) + get_dma_offset(dev); |
12d04eef | 72 | sg->dma_length = sg->length; |
2434bbb3 | 73 | __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); |
12d04eef | 74 | } |
5d33eebe | 75 | |
12d04eef | 76 | return nents; |
1da177e4 | 77 | } |
1da177e4 | 78 | |
12d04eef | 79 | static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg, |
3affedc4 MN |
80 | int nents, enum dma_data_direction direction, |
81 | struct dma_attrs *attrs) | |
1da177e4 | 82 | { |
12d04eef | 83 | } |
5d33eebe | 84 | |
12d04eef BH |
85 | static int dma_direct_dma_supported(struct device *dev, u64 mask) |
86 | { | |
4fc665b8 | 87 | #ifdef CONFIG_PPC64 |
b2f2e8fe | 88 | /* Could be improved so platforms can set the limit in case |
12d04eef BH |
89 | * they have limited DMA windows |
90 | */ | |
b2f2e8fe | 91 | return mask >= (lmb_end_of_DRAM() - 1); |
4fc665b8 BB |
92 | #else |
93 | return 1; | |
94 | #endif | |
95 | } | |
96 | ||
97 | static inline dma_addr_t dma_direct_map_page(struct device *dev, | |
98 | struct page *page, | |
99 | unsigned long offset, | |
100 | size_t size, | |
101 | enum dma_data_direction dir, | |
102 | struct dma_attrs *attrs) | |
103 | { | |
104 | BUG_ON(dir == DMA_NONE); | |
105 | __dma_sync_page(page, offset, size, dir); | |
1cebd7a0 | 106 | return page_to_phys(page) + offset + get_dma_offset(dev); |
4fc665b8 BB |
107 | } |
108 | ||
109 | static inline void dma_direct_unmap_page(struct device *dev, | |
110 | dma_addr_t dma_address, | |
111 | size_t size, | |
112 | enum dma_data_direction direction, | |
113 | struct dma_attrs *attrs) | |
114 | { | |
1da177e4 | 115 | } |
12d04eef | 116 | |
15e09c0e BB |
117 | #ifdef CONFIG_NOT_COHERENT_CACHE |
118 | static inline void dma_direct_sync_sg(struct device *dev, | |
119 | struct scatterlist *sgl, int nents, | |
120 | enum dma_data_direction direction) | |
121 | { | |
122 | struct scatterlist *sg; | |
123 | int i; | |
124 | ||
125 | for_each_sg(sgl, sg, nents, i) | |
126 | __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); | |
127 | } | |
128 | ||
129 | static inline void dma_direct_sync_single_range(struct device *dev, | |
130 | dma_addr_t dma_handle, unsigned long offset, size_t size, | |
131 | enum dma_data_direction direction) | |
132 | { | |
133 | __dma_sync(bus_to_virt(dma_handle+offset), size, direction); | |
134 | } | |
135 | #endif | |
136 | ||
45223c54 | 137 | struct dma_map_ops dma_direct_ops = { |
12d04eef BH |
138 | .alloc_coherent = dma_direct_alloc_coherent, |
139 | .free_coherent = dma_direct_free_coherent, | |
12d04eef BH |
140 | .map_sg = dma_direct_map_sg, |
141 | .unmap_sg = dma_direct_unmap_sg, | |
142 | .dma_supported = dma_direct_dma_supported, | |
4fc665b8 BB |
143 | .map_page = dma_direct_map_page, |
144 | .unmap_page = dma_direct_unmap_page, | |
15e09c0e BB |
145 | #ifdef CONFIG_NOT_COHERENT_CACHE |
146 | .sync_single_range_for_cpu = dma_direct_sync_single_range, | |
147 | .sync_single_range_for_device = dma_direct_sync_single_range, | |
148 | .sync_sg_for_cpu = dma_direct_sync_sg, | |
149 | .sync_sg_for_device = dma_direct_sync_sg, | |
150 | #endif | |
12d04eef BH |
151 | }; |
152 | EXPORT_SYMBOL(dma_direct_ops); | |
80d3e8ab FT |
153 | |
154 | #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) | |
155 | ||
156 | static int __init dma_init(void) | |
157 | { | |
158 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | fs_initcall(dma_init); |