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
of_dma_controller_register(struct device_node * np,struct dma_chan * (* of_dma_xlate)(struct of_phandle_args *,struct of_dma *),void * data)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
of_dma_controller_free(struct device_node * np)55 static inline void of_dma_controller_free(struct device_node *np)
56 {
57 }
58
of_dma_request_slave_channel(struct device_node * np,const char * name)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
of_dma_simple_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)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