1/*
2 * SHDMA Device Tree glue
3 *
4 * Copyright (C) 2013 Renesas Electronics Inc.
5 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
6 *
7 * This is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/dmaengine.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_dma.h>
16#include <linux/of_platform.h>
17#include <linux/platform_device.h>
18#include <linux/shdma-base.h>
19
20#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
21
22static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
23				       struct of_dma *ofdma)
24{
25	u32 id = dma_spec->args[0];
26	dma_cap_mask_t mask;
27	struct dma_chan *chan;
28
29	if (dma_spec->args_count != 1)
30		return NULL;
31
32	dma_cap_zero(mask);
33	/* Only slave DMA channels can be allocated via DT */
34	dma_cap_set(DMA_SLAVE, mask);
35
36	chan = dma_request_channel(mask, shdma_chan_filter,
37				   (void *)(uintptr_t)id);
38	if (chan)
39		to_shdma_chan(chan)->hw_req = id;
40
41	return chan;
42}
43
44static int shdma_of_probe(struct platform_device *pdev)
45{
46	const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
47	int ret;
48
49	ret = of_dma_controller_register(pdev->dev.of_node,
50					 shdma_of_xlate, pdev);
51	if (ret < 0)
52		return ret;
53
54	ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev);
55	if (ret < 0)
56		of_dma_controller_free(pdev->dev.of_node);
57
58	return ret;
59}
60
61static const struct of_device_id shdma_of_match[] = {
62	{ .compatible = "renesas,shdma-mux", },
63	{ }
64};
65MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
66
67static struct platform_driver shdma_of = {
68	.driver		= {
69		.name	= "shdma-of",
70		.of_match_table = shdma_of_match,
71	},
72	.probe		= shdma_of_probe,
73};
74
75module_platform_driver(shdma_of);
76
77MODULE_LICENSE("GPL v2");
78MODULE_DESCRIPTION("SH-DMA driver DT glue");
79MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
80