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