Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

Open Menu /include/linux/of_dma.h 
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * OF helpers for DMA request / controller
 *
 * Based on of_gpio.h
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 */

#ifndef __LINUX_OF_DMA_H
#define __LINUX_OF_DMA_H

#include <linux/of.h>
#include <linux/dmaengine.h>

struct device_node;

struct of_dma {
	struct list_head	of_dma_controllers;
	struct device_node	*of_node;
	struct dma_chan		*(*of_dma_xlate)
				(struct of_phandle_args *, struct of_dma *);
	void			*(*of_dma_route_allocate)
				(struct of_phandle_args *, struct of_dma *);
	struct dma_router	*dma_router;
	void			*of_dma_data;
};

struct of_dma_filter_info {
	dma_cap_mask_t	dma_cap;
	dma_filter_fn	filter_fn;
};

#ifdef CONFIG_DMA_OF
extern int of_dma_controller_register(struct device_node *np,
		struct dma_chan *(*of_dma_xlate)
		(struct of_phandle_args *, struct of_dma *),
		void *data);
extern void of_dma_controller_free(struct device_node *np);

extern int of_dma_router_register(struct device_node *np,
		void *(*of_dma_route_allocate)
		(struct of_phandle_args *, struct of_dma *),
		struct dma_router *dma_router);
#define of_dma_router_free of_dma_controller_free

extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
						     const char *name);
extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
		struct of_dma *ofdma);
extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
		struct of_dma *ofdma);

#else
static inline int of_dma_controller_register(struct device_node *np,
		struct dma_chan *(*of_dma_xlate)
		(struct of_phandle_args *, struct of_dma *),
		void *data)
{
	return -ENODEV;
}

static inline void of_dma_controller_free(struct device_node *np)
{
}

static inline int of_dma_router_register(struct device_node *np,
		void *(*of_dma_route_allocate)
		(struct of_phandle_args *, struct of_dma *),
		struct dma_router *dma_router)
{
	return -ENODEV;
}

#define of_dma_router_free of_dma_controller_free

static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
						     const char *name)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
		struct of_dma *ofdma)
{
	return NULL;
}

#define of_dma_xlate_by_chan_id NULL

#endif

#endif /* __LINUX_OF_DMA_H */