Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Dummy DMA ops that always fail.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/dma-map-ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 		void *cpu_addr, dma_addr_t dma_addr, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 		unsigned long attrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 		unsigned long offset, size_t size, enum dma_data_direction dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		unsigned long attrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	return DMA_MAPPING_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		int nelems, enum dma_data_direction dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		unsigned long attrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int dma_dummy_supported(struct device *hwdev, u64 mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) const struct dma_map_ops dma_dummy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	.mmap                   = dma_dummy_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	.map_page               = dma_dummy_map_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	.map_sg                 = dma_dummy_map_sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	.dma_supported          = dma_dummy_supported,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };