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};
29
30struct of_dma_filter_info {
31 dma_cap_mask_t dma_cap;
32 dma_filter_fn filter_fn;
33};
34
35#ifdef CONFIG_OF
36extern int of_dma_controller_register(struct device_node *np,
37 struct dma_chan *(*of_dma_xlate)
38 (struct of_phandle_args *, struct of_dma *),
39 void *data);
40extern void of_dma_controller_free(struct device_node *np);
41extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
42 const char *name);
43extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
44 struct of_dma *ofdma);
45#else
46static inline int of_dma_controller_register(struct device_node *np,
47 struct dma_chan *(*of_dma_xlate)
48 (struct of_phandle_args *, struct of_dma *),
49 void *data)
50{
51 return -ENODEV;
52}
53
54static inline void of_dma_controller_free(struct device_node *np)
55{
56}
57
58static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
59 const char *name)
60{
61 return NULL;
62}
63
64static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
65 struct of_dma *ofdma)
66{
67 return NULL;
68}
69
70#endif
71
72#endif /* __LINUX_OF_DMA_H */