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	struct resource *res_mem;
21	resource_size_t mdio_phys;
22	resource_size_t regsize;
23	union cvmx_smix_en smi_en;
24	int err = -ENOENT;
25
26	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
27	if (!mii_bus)
28		return -ENOMEM;
29
30	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
31	if (res_mem == NULL) {
32		dev_err(&pdev->dev, "found no memory resource\n");
33		return -ENXIO;
34	}
35
36	bus = mii_bus->priv;
37	bus->mii_bus = mii_bus;
38	mdio_phys = res_mem->start;
39	regsize = resource_size(res_mem);
40
41	if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
42				     res_mem->name)) {
43		dev_err(&pdev->dev, "request_mem_region failed\n");
44		return -ENXIO;
45	}
46
47	bus->register_base = devm_ioremap(&pdev->dev, mdio_phys, regsize);
48	if (!bus->register_base) {
49		dev_err(&pdev->dev, "dev_ioremap failed\n");
50		return -ENOMEM;
51	}
52
53	smi_en.u64 = 0;
54	smi_en.s.en = 1;
55	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
56
57	bus->mii_bus->name = KBUILD_MODNAME;
58	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
59	bus->mii_bus->parent = &pdev->dev;
60
61	bus->mii_bus->read = cavium_mdiobus_read_c22;
62	bus->mii_bus->write = cavium_mdiobus_write_c22;
63	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
64	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
65
66	platform_set_drvdata(pdev, bus);
67
68	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
69	if (err)
70		goto fail_register;
71
72	dev_info(&pdev->dev, "Probed\n");
73
74	return 0;
75fail_register:
76	smi_en.u64 = 0;
77	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
78	return err;
79}
80
81static void octeon_mdiobus_remove(struct platform_device *pdev)
82{
83	struct cavium_mdiobus *bus;
84	union cvmx_smix_en smi_en;
85
86	bus = platform_get_drvdata(pdev);
87
88	mdiobus_unregister(bus->mii_bus);
89	smi_en.u64 = 0;
90	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
91}
92
93static const struct of_device_id octeon_mdiobus_match[] = {
94	{
95		.compatible = "cavium,octeon-3860-mdio",
96	},
97	{},
98};
99MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
100
101static struct platform_driver octeon_mdiobus_driver = {
102	.driver = {
103		.name		= KBUILD_MODNAME,
104		.of_match_table = octeon_mdiobus_match,
105	},
106	.probe		= octeon_mdiobus_probe,
107	.remove_new	= octeon_mdiobus_remove,
108};
109
110module_platform_driver(octeon_mdiobus_driver);
111
112MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
113MODULE_AUTHOR("David Daney");
114MODULE_LICENSE("GPL v2");
115