/*
   * OF helpers for DMA request / controller
   *
   * Based on of_gpio.h
   *
   * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #ifndef __LINUX_OF_DMA_H
  #define __LINUX_OF_DMA_H
  
  #include <linux/of.h>
  #include <linux/dmaengine.h>
  
  struct device_node;
  
  struct of_dma {
  	struct list_head	of_dma_controllers;
  	struct device_node	*of_node;

  	struct dma_chan		*(*of_dma_xlate)
  				(struct of_phandle_args *, struct of_dma *);

  	void			*(*of_dma_route_allocate)
  				(struct of_phandle_args *, struct of_dma *);
  	struct dma_router	*dma_router;

  	void			*of_dma_data;
  };
  
  struct of_dma_filter_info {
  	dma_cap_mask_t	dma_cap;
  	dma_filter_fn	filter_fn;
  };

  #ifdef CONFIG_DMA_OF

  extern int of_dma_controller_register(struct device_node *np,
  		struct dma_chan *(*of_dma_xlate)
  		(struct of_phandle_args *, struct of_dma *),
  		void *data);

  extern void of_dma_controller_free(struct device_node *np);

  
  extern int of_dma_router_register(struct device_node *np,
  		void *(*of_dma_route_allocate)
  		(struct of_phandle_args *, struct of_dma *),
  		struct dma_router *dma_router);
  #define of_dma_router_free of_dma_controller_free

  extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,

  						     const char *name);

  extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
  		struct of_dma *ofdma);

  extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
  		struct of_dma *ofdma);

  #else

  static inline int of_dma_controller_register(struct device_node *np,

  		struct dma_chan *(*of_dma_xlate)
  		(struct of_phandle_args *, struct of_dma *),
  		void *data)
  {
  	return -ENODEV;
  }

  static inline void of_dma_controller_free(struct device_node *np)

  {
  }

  static inline int of_dma_router_register(struct device_node *np,
  		void *(*of_dma_route_allocate)
  		(struct of_phandle_args *, struct of_dma *),
  		struct dma_router *dma_router)
  {
  	return -ENODEV;
  }
  
  #define of_dma_router_free of_dma_controller_free

  static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,

  						     const char *name)

  {

  	return ERR_PTR(-ENODEV);

  }

  static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,

  		struct of_dma *ofdma)
  {
  	return NULL;
  }

  #define of_dma_xlate_by_chan_id NULL

  #endif

  
  #endif /* __LINUX_OF_DMA_H */