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 int use_count; 29 }; 30 31 struct of_dma_filter_info { 32 dma_cap_mask_t dma_cap; 33 dma_filter_fn filter_fn; 34 }; 35 36 #ifdef CONFIG_OF 37 extern int of_dma_controller_register(struct device_node *np, 38 struct dma_chan *(*of_dma_xlate) 39 (struct of_phandle_args *, struct of_dma *), 40 void *data); 41 extern int of_dma_controller_free(struct device_node *np); 42 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 43 char *name); 44 extern struct dma_chan *of_dma_simple_xlate(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 int of_dma_controller_free(struct device_node *np) 56 { 57 return -ENODEV; 58 } 59 60 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 61 char *name) 62 { 63 return NULL; 64 } 65 66 static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 67 struct of_dma *ofdma) 68 { 69 return NULL; 70 } 71 72 #endif 73 74 #endif /* __LINUX_OF_DMA_H */ 75