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 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);
44#else
45static inline int of_dma_controller_register(struct device_node *np,
46 struct dma_chan *(*of_dma_xlate)
47 (struct of_phandle_args *, struct of_dma *),
48 void *data)
49{
50 return -ENODEV;
51}
52
53static inline void of_dma_controller_free(struct device_node *np)
54{
55}
56
57static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
58 const char *name)
59{
60 return NULL;
61}
62
63static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
64 struct of_dma *ofdma)
65{
66 return NULL;
67}
68
69#endif
70
71#endif /* __LINUX_OF_DMA_H */