40 строки
970 B
C
40 строки
970 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Dummy DMA ops that always fail.
|
|
*/
|
|
#include <linux/dma-mapping.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,
|
|
};
|
|
EXPORT_SYMBOL(dma_dummy_ops);
|