33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#ifndef DMA_COHERENT_H
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#define DMA_COHERENT_H
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#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
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/*
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* These three functions are only for dma allocator.
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* Don't use them in device drivers.
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*/
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int dma_alloc_from_coherent(struct device *dev, ssize_t size,
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dma_addr_t *dma_handle, void **ret);
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int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
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int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, size_t size, int *ret);
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/*
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* Standard interface
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*/
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#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
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int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
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dma_addr_t device_addr, size_t size, int flags);
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void dma_release_declared_memory(struct device *dev);
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void *dma_mark_declared_memory_occupied(struct device *dev,
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dma_addr_t device_addr, size_t size);
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#else
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#define dma_alloc_from_coherent(dev, size, handle, ret) (0)
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#define dma_release_from_coherent(dev, order, vaddr) (0)
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#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
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#endif
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#endif
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