1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2009-2015 Cavium, Inc.
7 */
8
9 #include <linux/platform_device.h>
10 #include <linux/of_address.h>
11 #include <linux/of_mdio.h>
12 #include <linux/module.h>
13 #include <linux/gfp.h>
14 #include <linux/phy.h>
15 #include <linux/io.h>
16
17 #include "mdio-cavium.h"
18
octeon_mdiobus_probe(struct platform_device * pdev)19 static int octeon_mdiobus_probe(struct platform_device *pdev)
20 {
21 struct cavium_mdiobus *bus;
22 struct mii_bus *mii_bus;
23 struct resource *res_mem;
24 resource_size_t mdio_phys;
25 resource_size_t regsize;
26 union cvmx_smix_en smi_en;
27 int err = -ENOENT;
28
29 mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
30 if (!mii_bus)
31 return -ENOMEM;
32
33 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
34 if (res_mem == NULL) {
35 dev_err(&pdev->dev, "found no memory resource\n");
36 return -ENXIO;
37 }
38
39 bus = mii_bus->priv;
40 bus->mii_bus = mii_bus;
41 mdio_phys = res_mem->start;
42 regsize = resource_size(res_mem);
43
44 if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
45 res_mem->name)) {
46 dev_err(&pdev->dev, "request_mem_region failed\n");
47 return -ENXIO;
48 }
49
50 bus->register_base =
51 (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
52 if (!bus->register_base) {
53 dev_err(&pdev->dev, "dev_ioremap failed\n");
54 return -ENOMEM;
55 }
56
57 smi_en.u64 = 0;
58 smi_en.s.en = 1;
59 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
60
61 bus->mii_bus->name = KBUILD_MODNAME;
62 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
63 bus->mii_bus->parent = &pdev->dev;
64
65 bus->mii_bus->read = cavium_mdiobus_read;
66 bus->mii_bus->write = cavium_mdiobus_write;
67
68 platform_set_drvdata(pdev, bus);
69
70 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
71 if (err)
72 goto fail_register;
73
74 dev_info(&pdev->dev, "Probed\n");
75
76 return 0;
77 fail_register:
78 mdiobus_free(bus->mii_bus);
79 smi_en.u64 = 0;
80 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
81 return err;
82 }
83
octeon_mdiobus_remove(struct platform_device * pdev)84 static int octeon_mdiobus_remove(struct platform_device *pdev)
85 {
86 struct cavium_mdiobus *bus;
87 union cvmx_smix_en smi_en;
88
89 bus = platform_get_drvdata(pdev);
90
91 mdiobus_unregister(bus->mii_bus);
92 mdiobus_free(bus->mii_bus);
93 smi_en.u64 = 0;
94 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
95 return 0;
96 }
97
98 static const struct of_device_id octeon_mdiobus_match[] = {
99 {
100 .compatible = "cavium,octeon-3860-mdio",
101 },
102 {},
103 };
104 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
105
106 static struct platform_driver octeon_mdiobus_driver = {
107 .driver = {
108 .name = KBUILD_MODNAME,
109 .of_match_table = octeon_mdiobus_match,
110 },
111 .probe = octeon_mdiobus_probe,
112 .remove = octeon_mdiobus_remove,
113 };
114
octeon_mdiobus_force_mod_depencency(void)115 void octeon_mdiobus_force_mod_depencency(void)
116 {
117 /* Let ethernet drivers force us to be loaded. */
118 }
119 EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
120
121 module_platform_driver(octeon_mdiobus_driver);
122
123 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
124 MODULE_AUTHOR("David Daney");
125 MODULE_LICENSE("GPL");
126