1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Dummy DMA ops that always fail.
 4 */
 5#include <linux/dma-map-ops.h>
 6
 7static 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
14static 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
21static 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
28static int dma_dummy_supported(struct device *hwdev, u64 mask)
29{
30	return 0;
31}
32
33const 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};