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_route_allocate) 27 (struct of_phandle_args *, struct of_dma *); 28 struct dma_router *dma_router; 29 void *of_dma_data; 30}; 31 32struct of_dma_filter_info { 33 dma_cap_mask_t dma_cap; 34 dma_filter_fn filter_fn; 35}; 36 37#ifdef CONFIG_DMA_OF 38extern int of_dma_controller_register(struct device_node *np, 39 struct dma_chan *(*of_dma_xlate) 40 (struct of_phandle_args *, struct of_dma *), 41 void *data); 42extern void of_dma_controller_free(struct device_node *np); 43 44extern int of_dma_router_register(struct device_node *np, 45 void *(*of_dma_route_allocate) 46 (struct of_phandle_args *, struct of_dma *), 47 struct dma_router *dma_router); 48#define of_dma_router_free of_dma_controller_free 49 50extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 51 const char *name); 52extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 53 struct of_dma *ofdma); 54extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, 55 struct of_dma *ofdma); 56 57#else 58static inline int of_dma_controller_register(struct device_node *np, 59 struct dma_chan *(*of_dma_xlate) 60 (struct of_phandle_args *, struct of_dma *), 61 void *data) 62{ 63 return -ENODEV; 64} 65 66static inline void of_dma_controller_free(struct device_node *np) 67{ 68} 69 70static inline int of_dma_router_register(struct device_node *np, 71 void *(*of_dma_route_allocate) 72 (struct of_phandle_args *, struct of_dma *), 73 struct dma_router *dma_router) 74{ 75 return -ENODEV; 76} 77 78#define of_dma_router_free of_dma_controller_free 79 80static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 81 const char *name) 82{ 83 return ERR_PTR(-ENODEV); 84} 85 86static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 87 struct of_dma *ofdma) 88{ 89 return NULL; 90} 91 92#define of_dma_xlate_by_chan_id NULL 93 94#endif 95 96#endif /* __LINUX_OF_DMA_H */ 97