drivers/net/ethernet/arc/emac_arc.c

   1 /**
   2  * emac_arc.c - ARC EMAC specific glue layer
   3  *
   4  * Copyright (C) 2014 Romain Perier
   5  *
   6  * Romain Perier  <romain.perier@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/etherdevice.h>
  20 #include <linux/module.h>
  21 #include <linux/of_net.h>
  22 #include <linux/platform_device.h>
  23
  24 #include "emac.h"
  25
  26 #define DRV_NAME    "emac_arc"
  27 #define DRV_VERSION "1.0"
  28
  29 static int emac_arc_probe(struct platform_device *pdev)
  30 {
  31         struct device *dev = &pdev->dev;
  32         struct net_device *ndev;
  33         struct arc_emac_priv *priv;
  34         int interface, err;
  35
  36         if (!dev->of_node)
  37                 return -ENODEV;
  38
  39         ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
  40         if (!ndev)
  41                 return -ENOMEM;
  42         platform_set_drvdata(pdev, ndev);
  43         SET_NETDEV_DEV(ndev, dev);
  44
  45         priv = netdev_priv(ndev);
  46         priv->drv_name = DRV_NAME;
  47         priv->drv_version = DRV_VERSION;
  48
  49         interface = of_get_phy_mode(dev->of_node);
  50         if (interface < 0)
  51                 interface = PHY_INTERFACE_MODE_MII;
  52
  53         priv->clk = devm_clk_get(dev, "hclk");
  54         if (IS_ERR(priv->clk)) {
  55                 dev_err(dev, "failed to retrieve host clock from device tree\n");
  56                 err = -EINVAL;
  57                 goto out_netdev;
  58         }
  59
  60         err = arc_emac_probe(ndev, interface);
  61 out_netdev:
  62         if (err)
  63                 free_netdev(ndev);
  64         return err;
  65 }
  66
  67 static int emac_arc_remove(struct platform_device *pdev)
  68 {
  69         struct net_device *ndev = platform_get_drvdata(pdev);
  70         int err;
  71
  72         err = arc_emac_remove(ndev);
  73         free_netdev(ndev);
  74         return err;
  75 }
  76
  77 static const struct of_device_id emac_arc_dt_ids[] = {
  78         { .compatible = "snps,arc-emac" },
  79         { /* Sentinel */ }
  80 };
  81 MODULE_DEVICE_TABLE(of, emac_arc_dt_ids);
  82
  83 static struct platform_driver emac_arc_driver = {
  84         .probe = emac_arc_probe,
  85         .remove = emac_arc_remove,
  86         .driver = {
  87                 .name = DRV_NAME,
  88                 .of_match_table  = emac_arc_dt_ids,
  89         },
  90 };
  91
  92 module_platform_driver(emac_arc_driver);
  93
  94 MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
  95 MODULE_DESCRIPTION("ARC EMAC platform driver");
  96 MODULE_LICENSE("GPL");