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;
62 bus->mii_bus->write = cavium_mdiobus_write;
63
64 platform_set_drvdata(pdev, bus);
65
66 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
67 if (err)
68 goto fail_register;
69
70 dev_info(&pdev->dev, "Probed\n");
71
72 return 0;
73 fail_register:
74 mdiobus_free(bus->mii_bus);
75 smi_en.u64 = 0;
76 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
77 return err;
78 }
79
octeon_mdiobus_remove(struct platform_device * pdev)80 static int octeon_mdiobus_remove(struct platform_device *pdev)
81 {
82 struct cavium_mdiobus *bus;
83 union cvmx_smix_en smi_en;
84
85 bus = platform_get_drvdata(pdev);
86
87 mdiobus_unregister(bus->mii_bus);
88 mdiobus_free(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