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// SPDX-License-Identifier: GPL-2.0
/*
* Dummy DMA ops that always fail.
*/
#include <linux/dma-map-ops.h>
static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
return -ENXIO;
}
static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
return DMA_MAPPING_ERROR;
}
static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
return 0;
}
static int dma_dummy_supported(struct device *hwdev, u64 mask)
{
return 0;
}
const struct dma_map_ops dma_dummy_ops = {
.mmap = dma_dummy_mmap,
.map_page = dma_dummy_map_page,
.map_sg = dma_dummy_map_sg,
.dma_supported = dma_dummy_supported,
};
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