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 
octeon_mdiobus_probe(struct platform_device * pdev)16 static 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;
75 fail_register:
76 	smi_en.u64 = 0;
77 	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
78 	return err;
79 }
80 
octeon_mdiobus_remove(struct platform_device * pdev)81 static int 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 	return 0;
92 }
93 
94 static const struct of_device_id octeon_mdiobus_match[] = {
95 	{
96 		.compatible = "cavium,octeon-3860-mdio",
97 	},
98 	{},
99 };
100 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
101 
102 static struct platform_driver octeon_mdiobus_driver = {
103 	.driver = {
104 		.name		= KBUILD_MODNAME,
105 		.of_match_table = octeon_mdiobus_match,
106 	},
107 	.probe		= octeon_mdiobus_probe,
108 	.remove		= octeon_mdiobus_remove,
109 };
110 
111 module_platform_driver(octeon_mdiobus_driver);
112 
113 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
114 MODULE_AUTHOR("David Daney");
115 MODULE_LICENSE("GPL v2");
116