1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * OF helpers for DMA request / controller
4 *
5 * Based on of_gpio.h
6 *
7 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
8 */
9
10 #ifndef __LINUX_OF_DMA_H
11 #define __LINUX_OF_DMA_H
12
13 #include <linux/of.h>
14 #include <linux/dmaengine.h>
15
16 struct device_node;
17
18 struct of_dma {
19 struct list_head of_dma_controllers;
20 struct device_node *of_node;
21 struct dma_chan *(*of_dma_xlate)
22 (struct of_phandle_args *, struct of_dma *);
23 void *(*of_dma_route_allocate)
24 (struct of_phandle_args *, struct of_dma *);
25 struct dma_router *dma_router;
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_DMA_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
41 extern int of_dma_router_register(struct device_node *np,
42 void *(*of_dma_route_allocate)
43 (struct of_phandle_args *, struct of_dma *),
44 struct dma_router *dma_router);
45 #define of_dma_router_free of_dma_controller_free
46
47 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
48 const char *name);
49 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
50 struct of_dma *ofdma);
51 extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
52 struct of_dma *ofdma);
53
54 #else
55 static inline int of_dma_controller_register(struct device_node *np,
56 struct dma_chan *(*of_dma_xlate)
57 (struct of_phandle_args *, struct of_dma *),
58 void *data)
59 {
60 return -ENODEV;
61 }
62
63 static inline void of_dma_controller_free(struct device_node *np)
64 {
65 }
66
67 static inline int of_dma_router_register(struct device_node *np,
68 void *(*of_dma_route_allocate)
69 (struct of_phandle_args *, struct of_dma *),
70 struct dma_router *dma_router)
71 {
72 return -ENODEV;
73 }
74
75 #define of_dma_router_free of_dma_controller_free
76
77 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
78 const char *name)
79 {
80 return ERR_PTR(-ENODEV);
81 }
82
83 static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
84 struct of_dma *ofdma)
85 {
86 return NULL;
87 }
88
89 #define of_dma_xlate_by_chan_id NULL
90
91 #endif
92
93 #endif /* __LINUX_OF_DMA_H */
94
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