| #ifndef __BACKPORT_LINUX_DMA_MAPPING_H |
| #define __BACKPORT_LINUX_DMA_MAPPING_H |
| #include_next <linux/dma-mapping.h> |
| #include <linux/version.h> |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0) |
| #define dma_zalloc_coherent LINUX_BACKPORT(dma_zalloc_coherent) |
| static inline void *dma_zalloc_coherent(struct device *dev, size_t size, |
| dma_addr_t *dma_handle, gfp_t flag) |
| { |
| void *ret = dma_alloc_coherent(dev, size, dma_handle, flag); |
| if (ret) |
| memset(ret, 0, size); |
| return ret; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0) |
| /* |
| * Set both the DMA mask and the coherent DMA mask to the same thing. |
| * Note that we don't check the return value from dma_set_coherent_mask() |
| * as the DMA API guarantees that the coherent DMA mask can be set to |
| * the same or smaller than the streaming DMA mask. |
| */ |
| #define dma_set_mask_and_coherent LINUX_BACKPORT(dma_set_mask_and_coherent) |
| static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) |
| { |
| int rc = dma_set_mask(dev, mask); |
| if (rc == 0) |
| dma_set_coherent_mask(dev, mask); |
| return rc; |
| } |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0) */ |
| |
| #endif /* __BACKPORT_LINUX_DMA_MAPPING_H */ |
