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37 lines
802 B
C
37 lines
802 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef ASM_ARM_DMA_DIRECT_H
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#define ASM_ARM_DMA_DIRECT_H 1
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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unsigned int offset = paddr & ~PAGE_MASK;
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return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
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{
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unsigned int offset = dev_addr & ~PAGE_MASK;
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return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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u64 limit, mask;
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if (!dev->dma_mask)
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return 0;
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mask = *dev->dma_mask;
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limit = (mask + 1) & ~mask;
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if (limit && size > limit)
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return 0;
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if ((addr | (addr + size - 1)) & ~mask)
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return 0;
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return 1;
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}
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#endif /* ASM_ARM_DMA_DIRECT_H */
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