1/* 2 * OF helpers for DMA request / controller 3 * 4 * Based on of_gpio.h 5 * 6 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#ifndef __LINUX_OF_DMA_H 14#define __LINUX_OF_DMA_H 15 16#include <linux/of.h> 17#include <linux/dmaengine.h> 18 19struct device_node; 20 21struct of_dma { 22 struct list_head of_dma_controllers; 23 struct device_node *of_node; 24 struct dma_chan *(*of_dma_xlate) 25 (struct of_phandle_args *, struct of_dma *); 26 void *of_dma_data; 27}; 28 29struct of_dma_filter_info { 30 dma_cap_mask_t dma_cap; 31 dma_filter_fn filter_fn; 32}; 33 34#ifdef CONFIG_OF 35extern int of_dma_controller_register(struct device_node *np, 36 struct dma_chan *(*of_dma_xlate) 37 (struct of_phandle_args *, struct of_dma *), 38 void *data); 39extern void of_dma_controller_free(struct device_node *np); 40extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 41 const char *name); 42extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 43 struct of_dma *ofdma); 44extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, 45 struct of_dma *ofdma); 46#else 47static inline int of_dma_controller_register(struct device_node *np, 48 struct dma_chan *(*of_dma_xlate) 49 (struct of_phandle_args *, struct of_dma *), 50 void *data) 51{ 52 return -ENODEV; 53} 54 55static inline void of_dma_controller_free(struct device_node *np) 56{ 57} 58 59static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 60 const char *name) 61{ 62 return NULL; 63} 64 65static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 66 struct of_dma *ofdma) 67{ 68 return NULL; 69} 70 71#define of_dma_xlate_by_chan_id NULL 72 73#endif 74 75#endif /* __LINUX_OF_DMA_H */ 76