]>
Commit | Line | Data |
---|---|---|
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 */ |