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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4981c4dc19
This facilitates DMAC DT support by eliminating the need in AUXDATA and avoiding creating complex DT data. This also fits well with DMAC devices, of which SoCs often have multiple identical copies and it is perfectly valid to use a single configuration data set for all of them. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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, (void *)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 = pdev->dev.platform_data;
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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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.owner = THIS_MODULE,
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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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