mdio-octeon.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2009-2015 Cavium, Inc.
 4 */
 5
 6#include <linux/gfp.h>
 7#include <linux/io.h>
 8#include <linux/module.h>
 9#include <linux/of_address.h>
10#include <linux/of_mdio.h>
11#include <linux/phy.h>
12#include <linux/platform_device.h>
13
14#include "mdio-cavium.h"
15
16static int octeon_mdiobus_probe(struct platform_device *pdev)
17{
18	struct cavium_mdiobus *bus;
19	struct mii_bus *mii_bus;
20	union cvmx_smix_en smi_en;
21	int err;
22
23	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
24	if (!mii_bus)
25		return -ENOMEM;
26
27	bus = mii_bus->priv;
28	bus->mii_bus = mii_bus;
29
30	bus->register_base = devm_platform_ioremap_resource(pdev, 0);
31	if (IS_ERR(bus->register_base)) {
32		dev_err(&pdev->dev, "dev_ioremap failed\n");
33		return PTR_ERR(bus->register_base);
34	}
35
36	smi_en.u64 = 0;
37	smi_en.s.en = 1;
38	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
39
40	bus->mii_bus->name = KBUILD_MODNAME;
41	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
42	bus->mii_bus->parent = &pdev->dev;
43
44	bus->mii_bus->read = cavium_mdiobus_read_c22;
45	bus->mii_bus->write = cavium_mdiobus_write_c22;
46	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
47	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
48
49	platform_set_drvdata(pdev, bus);
50
51	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
52	if (err)
53		goto fail_register;
54
55	dev_info(&pdev->dev, "Probed\n");
56
57	return 0;
58fail_register:
59	smi_en.u64 = 0;
60	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
61	return err;
62}
63
64static void octeon_mdiobus_remove(struct platform_device *pdev)
65{
66	struct cavium_mdiobus *bus;
67	union cvmx_smix_en smi_en;
68
69	bus = platform_get_drvdata(pdev);
70
71	mdiobus_unregister(bus->mii_bus);
72	smi_en.u64 = 0;
73	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
74}
75
76static const struct of_device_id octeon_mdiobus_match[] = {
77	{
78		.compatible = "cavium,octeon-3860-mdio",
79	},
80	{},
81};
82MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
83
84static struct platform_driver octeon_mdiobus_driver = {
85	.driver = {
86		.name		= KBUILD_MODNAME,
87		.of_match_table = octeon_mdiobus_match,
88	},
89	.probe		= octeon_mdiobus_probe,
90	.remove		= octeon_mdiobus_remove,
91};
92
93module_platform_driver(octeon_mdiobus_driver);
94
95MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
96MODULE_AUTHOR("David Daney");
97MODULE_LICENSE("GPL v2");