/*
   * include/linux/dmapool.h
   *
   * Allocation pools for DMAable (coherent) memory.
   *
   * This file is licensed under  the terms of the GNU General Public 
   * License version 2. This program is licensed "as is" without any 
   * warranty of any kind, whether express or implied.
   */
  
  #ifndef LINUX_DMAPOOL_H
  #define	LINUX_DMAPOOL_H

  #include <linux/scatterlist.h>

  #include <asm/io.h>

  struct device;

  #ifdef CONFIG_HAS_DMA

  struct dma_pool *dma_pool_create(const char *name, struct device *dev, 
  			size_t size, size_t align, size_t allocation);
  
  void dma_pool_destroy(struct dma_pool *pool);

  void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,

  		     dma_addr_t *handle);

  void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);

  /*
   * Managed DMA pool
   */
  struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
  				  size_t size, size_t align, size_t allocation);
  void dmam_pool_destroy(struct dma_pool *pool);

  #else /* !CONFIG_HAS_DMA */
  static inline struct dma_pool *dma_pool_create(const char *name,
  	struct device *dev, size_t size, size_t align, size_t allocation)
  { return NULL; }
  static inline void dma_pool_destroy(struct dma_pool *pool) { }
  static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
  				   dma_addr_t *handle) { return NULL; }
  static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
  				 dma_addr_t addr) { }
  static inline struct dma_pool *dmam_pool_create(const char *name,
  	struct device *dev, size_t size, size_t align, size_t allocation)
  { return NULL; }
  static inline void dmam_pool_destroy(struct dma_pool *pool) { }
  #endif /* !CONFIG_HAS_DMA */
  
  static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
  				    dma_addr_t *handle)
  {
  	return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
  }

  #endif