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Linux/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,
 37                                    (void *)(uintptr_t)id);
 38         if (chan)
 39                 to_shdma_chan(chan)->hw_req = id;
 40 
 41         return chan;
 42 }
 43 
 44 static 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 
 61 static const struct of_device_id shdma_of_match[] = {
 62         { .compatible = "renesas,shdma-mux", },
 63         { }
 64 };
 65 MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
 66 
 67 static struct platform_driver shdma_of = {
 68         .driver         = {
 69                 .owner  = THIS_MODULE,
 70                 .name   = "shdma-of",
 71                 .of_match_table = shdma_of_match,
 72         },
 73         .probe          = shdma_of_probe,
 74 };
 75 
 76 module_platform_driver(shdma_of);
 77 
 78 MODULE_LICENSE("GPL v2");
 79 MODULE_DESCRIPTION("SH-DMA driver DT glue");
 80 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 81 

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