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