xref: /openbmc/linux/include/linux/dmapool.h (revision c1ce6c2b)
1 /*
2  * include/linux/dmapool.h
3  *
4  * Allocation pools for DMAable (coherent) memory.
5  *
6  * This file is licensed under  the terms of the GNU General Public
7  * License version 2. This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10 
11 #ifndef LINUX_DMAPOOL_H
12 #define	LINUX_DMAPOOL_H
13 
14 #include <linux/scatterlist.h>
15 #include <asm/io.h>
16 
17 struct device;
18 
19 #ifdef CONFIG_HAS_DMA
20 
21 struct dma_pool *dma_pool_create(const char *name, struct device *dev,
22 			size_t size, size_t align, size_t allocation);
23 
24 void dma_pool_destroy(struct dma_pool *pool);
25 
26 void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
27 		     dma_addr_t *handle);
28 void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
29 
30 /*
31  * Managed DMA pool
32  */
33 struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
34 				  size_t size, size_t align, size_t allocation);
35 void dmam_pool_destroy(struct dma_pool *pool);
36 
37 #else /* !CONFIG_HAS_DMA */
dma_pool_create(const char * name,struct device * dev,size_t size,size_t align,size_t allocation)38 static inline struct dma_pool *dma_pool_create(const char *name,
39 	struct device *dev, size_t size, size_t align, size_t allocation)
40 { return NULL; }
dma_pool_destroy(struct dma_pool * pool)41 static inline void dma_pool_destroy(struct dma_pool *pool) { }
dma_pool_alloc(struct dma_pool * pool,gfp_t mem_flags,dma_addr_t * handle)42 static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
43 				   dma_addr_t *handle) { return NULL; }
dma_pool_free(struct dma_pool * pool,void * vaddr,dma_addr_t addr)44 static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
45 				 dma_addr_t addr) { }
dmam_pool_create(const char * name,struct device * dev,size_t size,size_t align,size_t allocation)46 static inline struct dma_pool *dmam_pool_create(const char *name,
47 	struct device *dev, size_t size, size_t align, size_t allocation)
48 { return NULL; }
dmam_pool_destroy(struct dma_pool * pool)49 static inline void dmam_pool_destroy(struct dma_pool *pool) { }
50 #endif /* !CONFIG_HAS_DMA */
51 
dma_pool_zalloc(struct dma_pool * pool,gfp_t mem_flags,dma_addr_t * handle)52 static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
53 				    dma_addr_t *handle)
54 {
55 	return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
56 }
57 
58 #endif
59 
60