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(dev: &pdev->dev, sizeof_priv: 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: 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(dev: &pdev->dev, offset: mdio_phys, size: 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(buf: bus->mii_bus->id, MII_BUS_ID_SIZE, fmt: "%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, data: bus);
67
68 err = of_mdiobus_register(mdio: bus->mii_bus, np: 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: 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

source code of linux/drivers/net/mdio/mdio-octeon.c