Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 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
31struct of_dma_filter_info {
32 dma_cap_mask_t dma_cap;
33 dma_filter_fn filter_fn;
34};
35
36#ifdef CONFIG_OF
37extern 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);
41extern int of_dma_controller_free(struct device_node *np);
42extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
43 char *name);
44extern struct dma_chan *of_dma_simple_xlate(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 int of_dma_controller_free(struct device_node *np)
56{
57 return -ENODEV;
58}
59
60static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
61 char *name)
62{
63 return NULL;
64}
65
66static 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 */