| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | #ifndef DMA_COHERENT_H |
| 2 | #define DMA_COHERENT_H |
| 3 | |
| 4 | #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT |
| 5 | /* |
| 6 | * These two functions are only for dma allocator. |
| 7 | * Don't use them in device drivers. |
| 8 | */ |
| 9 | int dma_alloc_from_coherent(struct device *dev, ssize_t size, |
| 10 | dma_addr_t *dma_handle, void **ret); |
| 11 | int dma_release_from_coherent(struct device *dev, int order, void *vaddr); |
| 12 | |
| 13 | /* |
| 14 | * Standard interface |
| 15 | */ |
| 16 | #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY |
| 17 | extern int |
| 18 | dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, |
| 19 | dma_addr_t device_addr, size_t size, int flags); |
| 20 | |
| 21 | extern void |
| 22 | dma_release_declared_memory(struct device *dev); |
| 23 | |
| 24 | extern void * |
| 25 | dma_mark_declared_memory_occupied(struct device *dev, |
| 26 | dma_addr_t device_addr, size_t size); |
| 27 | #else |
| 28 | #define dma_alloc_from_coherent(dev, size, handle, ret) (0) |
| 29 | #define dma_release_from_coherent(dev, order, vaddr) (0) |
| 30 | #endif |
| 31 | |
| 32 | #endif |