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_route_allocate) 27 (struct of_phandle_args *, struct of_dma *); 28 struct dma_router *dma_router; 29 void *of_dma_data; 30 }; 31 32 struct of_dma_filter_info { 33 dma_cap_mask_t dma_cap; 34 dma_filter_fn filter_fn; 35 }; 36 37 #ifdef CONFIG_DMA_OF 38 extern 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); 42 extern void of_dma_controller_free(struct device_node *np); 43 44 extern 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 50 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, 51 const char *name); 52 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, 53 struct of_dma *ofdma); 54 extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, 55 struct of_dma *ofdma); 56 57 #else 58 static 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 66 static inline void of_dma_controller_free(struct device_node *np) 67 { 68 } 69 70 static 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 80 static 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 86 static 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