1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /**
3  * 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 #define DRV_VERSION "1.0"
19 
20 static int emac_arc_probe(struct platform_device *pdev)
21 {
22 	struct device *dev = &pdev->dev;
23 	struct arc_emac_priv *priv;
24 	phy_interface_t interface;
25 	struct net_device *ndev;
26 	int err;
27 
28 	if (!dev->of_node)
29 		return -ENODEV;
30 
31 	ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
32 	if (!ndev)
33 		return -ENOMEM;
34 	platform_set_drvdata(pdev, ndev);
35 	SET_NETDEV_DEV(ndev, dev);
36 
37 	priv = netdev_priv(ndev);
38 	priv->drv_name = DRV_NAME;
39 	priv->drv_version = DRV_VERSION;
40 
41 	err = of_get_phy_mode(dev->of_node, &interface);
42 	if (err) {
43 		if (err == -ENODEV)
44 			interface = PHY_INTERFACE_MODE_MII;
45 		else
46 			goto out_netdev;
47 	}
48 
49 	priv->clk = devm_clk_get(dev, "hclk");
50 	if (IS_ERR(priv->clk)) {
51 		dev_err(dev, "failed to retrieve host clock from device tree\n");
52 		err = -EINVAL;
53 		goto out_netdev;
54 	}
55 
56 	err = arc_emac_probe(ndev, interface);
57 out_netdev:
58 	if (err)
59 		free_netdev(ndev);
60 	return err;
61 }
62 
63 static int emac_arc_remove(struct platform_device *pdev)
64 {
65 	struct net_device *ndev = platform_get_drvdata(pdev);
66 	int err;
67 
68 	err = arc_emac_remove(ndev);
69 	free_netdev(ndev);
70 	return err;
71 }
72 
73 static const struct of_device_id emac_arc_dt_ids[] = {
74 	{ .compatible = "snps,arc-emac" },
75 	{ /* Sentinel */ }
76 };
77 MODULE_DEVICE_TABLE(of, emac_arc_dt_ids);
78 
79 static struct platform_driver emac_arc_driver = {
80 	.probe = emac_arc_probe,
81 	.remove = emac_arc_remove,
82 	.driver = {
83 		.name = DRV_NAME,
84 		.of_match_table  = emac_arc_dt_ids,
85 	},
86 };
87 
88 module_platform_driver(emac_arc_driver);
89 
90 MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
91 MODULE_DESCRIPTION("ARC EMAC platform driver");
92 MODULE_LICENSE("GPL");
93