/* * 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_data; }; struct of_dma_filter_info { dma_cap_mask_t dma_cap; dma_filter_fn filter_fn; }; #ifdef CONFIG_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 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 struct dma_chan *of_dma_request_slave_channel(struct device_node *np, const char *name) { return NULL; } 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 */