1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /**
3  * DOC: emac_arc.c - ARC EMAC specific glue layer
4  *
5  * Copyright (C) 2014 Romain Perier
6  *
7  * Romain Perier  <romain.perier@gmail.com>
8  */
9 
10 #include <linux/etherdevice.h>
11 #include <linux/module.h>
12 #include <linux/of_net.h>
13 #include <linux/platform_device.h>
14 
15 #include "emac.h"
16 
17 #define DRV_NAME    "emac_arc"
18 
19 static int emac_arc_probe(struct platform_device *pdev)
20 {
21 	struct device *dev = &pdev->dev;
22 	struct arc_emac_priv *priv;
23 	phy_interface_t interface;
24 	struct net_device *ndev;
25 	int err;
26 
27 	if (!dev->of_node)
28 		return -ENODEV;
29 
30 	ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
31 	if (!ndev)
32 		return -ENOMEM;
33 	platform_set_drvdata(pdev, ndev);
34 	SET_NETDEV_DEV(ndev, dev);
35 
36 	priv = netdev_priv(ndev);
37 	priv->drv_name = DRV_NAME;
38 
39 	err = of_get_phy_mode(dev->of_node, &interface);
40 	if (err) {
41 		if (err == -ENODEV)
42 			interface = PHY_INTERFACE_MODE_MII;
43 		else
44 			goto out_netdev;
45 	}
46 
47 	priv->clk = devm_clk_get(dev, "hclk");
48 	if (IS_ERR(priv->clk)) {
49 		dev_err(dev, "failed to retrieve host clock from device tree\n");
50 		err = -EINVAL;
51 		goto out_netdev;
52 	}
53 
54 	err = arc_emac_probe(ndev, interface);
55 out_netdev:
56 	if (err)
57 		free_netdev(ndev);
58 	return err;
59 }
60 
61 static int emac_arc_remove(struct platform_device *pdev)
62 {
63 	struct net_device *ndev = platform_get_drvdata(pdev);
64 
65 	arc_emac_remove(ndev);
66 	free_netdev(ndev);
67 
68 	return 0;
69 }
70 
71 static const struct of_device_id emac_arc_dt_ids[] = {
72 	{ .compatible = "snps,arc-emac" },
73 	{ /* Sentinel */ }
74 };
75 MODULE_DEVICE_TABLE(of, emac_arc_dt_ids);
76 
77 static struct platform_driver emac_arc_driver = {
78 	.probe = emac_arc_probe,
79 	.remove = emac_arc_remove,
80 	.driver = {
81 		.name = DRV_NAME,
82 		.of_match_table  = emac_arc_dt_ids,
83 	},
84 };
85 
86 module_platform_driver(emac_arc_driver);
87 
88 MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
89 MODULE_DESCRIPTION("ARC EMAC platform driver");
90 MODULE_LICENSE("GPL");
91