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 int of_dma_nbcells; 25 struct dma_chan *(*of_dma_xlate) 26 (struct of_phandle_args *, struct of_dma *); 27 void *of_dma_data; 28 }; 29 30 struct of_dma_filter_info { 31 dma_cap_mask_t dma_cap; 32 dma_filter_fn filter_fn; 33 }; 34 35 #ifdef CONFIG_OF 36 extern int of_dma_controller_register(struct device_node *np, 37 struct dma_chan *(*of_dma_xlate) 38 (struct of_phandle_args *, struct of_dma *), 39 void *data); 40 extern void of_dma_controller_free(struct device_node *np); 41 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 42 const char *name); 43 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 44 struct of_dma *ofdma); 45 #else 46 static inline int of_dma_controller_register(struct device_node *np, 47 struct dma_chan *(*of_dma_xlate) 48 (struct of_phandle_args *, struct of_dma *), 49 void *data) 50 { 51 return -ENODEV; 52 } 53 54 static inline void of_dma_controller_free(struct device_node *np) 55 { 56 } 57 58 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 59 const char *name) 60 { 61 return NULL; 62 } 63 64 static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 65 struct of_dma *ofdma) 66 { 67 return NULL; 68 } 69 70 #endif 71 72 #endif /* __LINUX_OF_DMA_H */ 73