Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / dma / sh / shdma-of.c
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
22 static 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, (void *)id);
37         if (chan)
38                 to_shdma_chan(chan)->hw_req = id;
39
40         return chan;
41 }
42
43 static int shdma_of_probe(struct platform_device *pdev)
44 {
45         const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
46         int ret;
47
48         ret = of_dma_controller_register(pdev->dev.of_node,
49                                          shdma_of_xlate, pdev);
50         if (ret < 0)
51                 return ret;
52
53         ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev);
54         if (ret < 0)
55                 of_dma_controller_free(pdev->dev.of_node);
56
57         return ret;
58 }
59
60 static const struct of_device_id shdma_of_match[] = {
61         { .compatible = "renesas,shdma-mux", },
62         { }
63 };
64 MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
65
66 static struct platform_driver shdma_of = {
67         .driver         = {
68                 .owner  = THIS_MODULE,
69                 .name   = "shdma-of",
70                 .of_match_table = shdma_of_match,
71         },
72         .probe          = shdma_of_probe,
73 };
74
75 module_platform_driver(shdma_of);
76
77 MODULE_LICENSE("GPL v2");
78 MODULE_DESCRIPTION("SH-DMA driver DT glue");
79 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");