tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2009-2015 Cavium, Inc.
4 */
5
6#include <linux/platform_device.h>
7#include <linux/of_address.h>
8#include <linux/of_mdio.h>
9#include <linux/module.h>
10#include <linux/gfp.h>
11#include <linux/phy.h>
12#include <linux/io.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 =
48 (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
49 if (!bus->register_base) {
50 dev_err(&pdev->dev, "dev_ioremap failed\n");
51 return -ENOMEM;
52 }
53
54 smi_en.u64 = 0;
55 smi_en.s.en = 1;
56 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
57
58 bus->mii_bus->name = KBUILD_MODNAME;
59 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
60 bus->mii_bus->parent = &pdev->dev;
61
62 bus->mii_bus->read = cavium_mdiobus_read;
63 bus->mii_bus->write = cavium_mdiobus_write;
64
65 platform_set_drvdata(pdev, bus);
66
67 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
68 if (err)
69 goto fail_register;
70
71 dev_info(&pdev->dev, "Probed\n");
72
73 return 0;
74fail_register:
75 mdiobus_free(bus->mii_bus);
76 smi_en.u64 = 0;
77 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
78 return err;
79}
80
81static 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 mdiobus_free(bus->mii_bus);
90 smi_en.u64 = 0;
91 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
92 return 0;
93}
94
95static const struct of_device_id octeon_mdiobus_match[] = {
96 {
97 .compatible = "cavium,octeon-3860-mdio",
98 },
99 {},
100};
101MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
102
103static struct platform_driver octeon_mdiobus_driver = {
104 .driver = {
105 .name = KBUILD_MODNAME,
106 .of_match_table = octeon_mdiobus_match,
107 },
108 .probe = octeon_mdiobus_probe,
109 .remove = octeon_mdiobus_remove,
110};
111
112void octeon_mdiobus_force_mod_depencency(void)
113{
114 /* Let ethernet drivers force us to be loaded. */
115}
116EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
117
118module_platform_driver(octeon_mdiobus_driver);
119
120MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
121MODULE_AUTHOR("David Daney");
122MODULE_LICENSE("GPL v2");