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 19 struct device_node; 20 21 struct 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 29 struct of_dma_filter_info { 30 dma_cap_mask_t dma_cap; 31 dma_filter_fn filter_fn; 32 }; 33 34 #ifdef CONFIG_OF 35 extern 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); 39 extern void of_dma_controller_free(struct device_node *np); 40 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 41 const char *name); 42 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 43 struct of_dma *ofdma); 44 extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, 45 struct of_dma *ofdma); 46 #else 47 static 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 55 static inline void of_dma_controller_free(struct device_node *np) 56 { 57 } 58 59 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 60 const char *name) 61 { 62 return NULL; 63 } 64 65 static 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