80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* SHDMA Device Tree glue
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*
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* Copyright (C) 2013 Renesas Electronics Inc.
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* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#include <linux/dmaengine.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_dma.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/shdma-base.h>
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#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
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static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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u32 id = dma_spec->args[0];
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dma_cap_mask_t mask;
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struct dma_chan *chan;
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if (dma_spec->args_count != 1)
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return NULL;
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dma_cap_zero(mask);
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/* Only slave DMA channels can be allocated via DT */
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dma_cap_set(DMA_SLAVE, mask);
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chan = dma_request_channel(mask, shdma_chan_filter,
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(void *)(uintptr_t)id);
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if (chan)
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to_shdma_chan(chan)->hw_req = id;
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return chan;
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}
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static int shdma_of_probe(struct platform_device *pdev)
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{
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const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
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int ret;
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ret = of_dma_controller_register(pdev->dev.of_node,
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shdma_of_xlate, pdev);
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if (ret < 0)
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return ret;
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ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev);
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if (ret < 0)
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of_dma_controller_free(pdev->dev.of_node);
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return ret;
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}
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static const struct of_device_id shdma_of_match[] = {
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{ .compatible = "renesas,shdma-mux", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
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static struct platform_driver shdma_of = {
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.driver = {
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.name = "shdma-of",
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.of_match_table = shdma_of_match,
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},
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.probe = shdma_of_probe,
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};
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module_platform_driver(shdma_of);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("SH-DMA driver DT glue");
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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