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Commit f454aa6b authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 017cc022

include/asm-arm/dma-mapping.h

+16 −0
Original line number Diff line number Diff line
@@ -61,6 +61,22 @@ static inline int dma_mapping_error(dma_addr_t dma_addr) 
	return dma_addr == ~0;

}



/*

 * Dummy noncoherent implementation.  We don't provide a dma_cache_sync

 * function so drivers using this API are highlighted with build warnings.

 */

static inline void *

dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)

{

	return NULL;

}



static inline void

dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,

		     dma_addr_t handle)

{

}



/**

 * dma_alloc_coherent - allocate consistent memory for DMA

 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices