1
2
3
4
5
6
7
8
9
10
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
19struct device_node;
20
21struct 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
29struct of_dma_filter_info {
30 dma_cap_mask_t dma_cap;
31 dma_filter_fn filter_fn;
32};
33
34#ifdef CONFIG_OF
35extern 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);
39extern void of_dma_controller_free(struct device_node *np);
40extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
41 const char *name);
42extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
43 struct of_dma *ofdma);
44extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
45 struct of_dma *ofdma);
46#else
47static 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
55static inline void of_dma_controller_free(struct device_node *np)
56{
57}
58
59static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
60 const char *name)
61{
62 return NULL;
63}
64
65static 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
76