1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * include/linux/dmapool.h
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Allocation pools for DMAable (coherent) memory.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This file is licensed under the terms of the GNU General Public
7*4882a593Smuzhiyun * License version 2. This program is licensed "as is" without any
8*4882a593Smuzhiyun * warranty of any kind, whether express or implied.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #ifndef LINUX_DMAPOOL_H
12*4882a593Smuzhiyun #define LINUX_DMAPOOL_H
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/scatterlist.h>
15*4882a593Smuzhiyun #include <asm/io.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct device;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #ifdef CONFIG_HAS_DMA
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct dma_pool *dma_pool_create(const char *name, struct device *dev,
22*4882a593Smuzhiyun size_t size, size_t align, size_t allocation);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun void dma_pool_destroy(struct dma_pool *pool);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
27*4882a593Smuzhiyun dma_addr_t *handle);
28*4882a593Smuzhiyun void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * Managed DMA pool
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
34*4882a593Smuzhiyun size_t size, size_t align, size_t allocation);
35*4882a593Smuzhiyun void dmam_pool_destroy(struct dma_pool *pool);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #else /* !CONFIG_HAS_DMA */
dma_pool_create(const char * name,struct device * dev,size_t size,size_t align,size_t allocation)38*4882a593Smuzhiyun static inline struct dma_pool *dma_pool_create(const char *name,
39*4882a593Smuzhiyun struct device *dev, size_t size, size_t align, size_t allocation)
40*4882a593Smuzhiyun { return NULL; }
dma_pool_destroy(struct dma_pool * pool)41*4882a593Smuzhiyun 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*4882a593Smuzhiyun static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
43*4882a593Smuzhiyun dma_addr_t *handle) { return NULL; }
dma_pool_free(struct dma_pool * pool,void * vaddr,dma_addr_t addr)44*4882a593Smuzhiyun static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
45*4882a593Smuzhiyun dma_addr_t addr) { }
dmam_pool_create(const char * name,struct device * dev,size_t size,size_t align,size_t allocation)46*4882a593Smuzhiyun static inline struct dma_pool *dmam_pool_create(const char *name,
47*4882a593Smuzhiyun struct device *dev, size_t size, size_t align, size_t allocation)
48*4882a593Smuzhiyun { return NULL; }
dmam_pool_destroy(struct dma_pool * pool)49*4882a593Smuzhiyun static inline void dmam_pool_destroy(struct dma_pool *pool) { }
50*4882a593Smuzhiyun #endif /* !CONFIG_HAS_DMA */
51*4882a593Smuzhiyun
dma_pool_zalloc(struct dma_pool * pool,gfp_t mem_flags,dma_addr_t * handle)52*4882a593Smuzhiyun static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
53*4882a593Smuzhiyun dma_addr_t *handle)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #endif
59*4882a593Smuzhiyun
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