[ARM] Provide dummy noncoherent DMA API
We don't currently support the noncoherent DMA API, but it needs to be provided for kernels with devres to link. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -61,6 +61,22 @@ static inline int dma_mapping_error(dma_addr_t dma_addr)
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return dma_addr == ~0;
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}
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/*
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* Dummy noncoherent implementation. We don't provide a dma_cache_sync
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* function so drivers using this API are highlighted with build warnings.
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*/
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static inline void *
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dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
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{
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return NULL;
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}
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static inline void
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dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t handle)
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{
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}
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/**
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* dma_alloc_coherent - allocate consistent memory for DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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