2 * SHDMA Device Tree glue
4 * Copyright (C) 2013 Renesas Electronics Inc.
5 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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.
12 #include <linux/dmaengine.h>
13 #include <linux/module.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>
20 #define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
22 static struct dma_chan
*shdma_of_xlate(struct of_phandle_args
*dma_spec
,
25 u32 id
= dma_spec
->args
[0];
27 struct dma_chan
*chan
;
29 if (dma_spec
->args_count
!= 1)
33 /* Only slave DMA channels can be allocated via DT */
34 dma_cap_set(DMA_SLAVE
, mask
);
36 chan
= dma_request_channel(mask
, shdma_chan_filter
, (void *)id
);
38 to_shdma_chan(chan
)->hw_req
= id
;
43 static int shdma_of_probe(struct platform_device
*pdev
)
45 const struct of_dev_auxdata
*lookup
= pdev
->dev
.platform_data
;
51 ret
= of_dma_controller_register(pdev
->dev
.of_node
,
52 shdma_of_xlate
, pdev
);
56 ret
= of_platform_populate(pdev
->dev
.of_node
, NULL
, lookup
, &pdev
->dev
);
58 of_dma_controller_free(pdev
->dev
.of_node
);
63 static const struct of_device_id shdma_of_match
[] = {
64 { .compatible
= "renesas,shdma-mux", },
67 MODULE_DEVICE_TABLE(of
, sh_dmae_of_match
);
69 static struct platform_driver shdma_of
= {
73 .of_match_table
= shdma_of_match
,
75 .probe
= shdma_of_probe
,
78 module_platform_driver(shdma_of
);
80 MODULE_LICENSE("GPL v2");
81 MODULE_DESCRIPTION("SH-DMA driver DT glue");
82 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");