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
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 /* __LINUX_OF_DMA_H */
76