1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Dummy DMA ops that always fail.
4 */
5 #include <linux/dma-map-ops.h>
6
7 static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
8 void *cpu_addr, dma_addr_t dma_addr, size_t size,
9 unsigned long attrs)
10 {
11 return -ENXIO;
12 }
13
14 static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
15 unsigned long offset, size_t size, enum dma_data_direction dir,
16 unsigned long attrs)
17 {
18 return DMA_MAPPING_ERROR;
19 }
20
21 static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
22 int nelems, enum dma_data_direction dir,
23 unsigned long attrs)
24 {
25 return -EINVAL;
26 }
27
28 static int dma_dummy_supported(struct device *hwdev, u64 mask)
29 {
30 return 0;
31 }
32
33 const struct dma_map_ops dma_dummy_ops = {
34 .mmap = dma_dummy_mmap,
35 .map_page = dma_dummy_map_page,
36 .map_sg = dma_dummy_map_sg,
37 .dma_supported = dma_dummy_supported,
38 };
39
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