summaryrefslogtreecommitdiffstats
path: root/drivers/net/phy/mdio-octeon.c
blob: ab6914f8bd50f956efe1ce162a98b56469cbbe07 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2009-2015 Cavium, Inc.
 */

#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/phy.h>
#include <linux/io.h>

#include "mdio-cavium.h"

static int octeon_mdiobus_probe(struct platform_device *pdev)
{
	struct cavium_mdiobus *bus;
	struct mii_bus *mii_bus;
	struct resource *res_mem;
	resource_size_t mdio_phys;
	resource_size_t regsize;
	union cvmx_smix_en smi_en;
	int err = -ENOENT;

	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
	if (!mii_bus)
		return -ENOMEM;

	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res_mem == NULL) {
		dev_err(&pdev->dev, "found no memory resource\n");
		return -ENXIO;
	}

	bus = mii_bus->priv;
	bus->mii_bus = mii_bus;
	mdio_phys = res_mem->start;
	regsize = resource_size(res_mem);

	if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
				     res_mem->name)) {
		dev_err(&pdev->dev, "request_mem_region failed\n");
		return -ENXIO;
	}

	bus->register_base =
		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
	if (!bus->register_base) {
		dev_err(&pdev->dev, "dev_ioremap failed\n");
		return -ENOMEM;
	}

	smi_en.u64 = 0;
	smi_en.s.en = 1;
	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);

	bus->mii_bus->name = KBUILD_MODNAME;
	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
	bus->mii_bus->parent = &pdev->dev;

	bus->mii_bus->read = cavium_mdiobus_read;
	bus->mii_bus->write = cavium_mdiobus_write;

	platform_set_drvdata(pdev, bus);

	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
	if (err)
		goto fail_register;

	dev_info(&pdev->dev, "Probed\n");

	return 0;
fail_register:
	mdiobus_free(bus->mii_bus);
	smi_en.u64 = 0;
	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
	return err;
}

static int octeon_mdiobus_remove(struct platform_device *pdev)
{
	struct cavium_mdiobus *bus;
	union cvmx_smix_en smi_en;

	bus = platform_get_drvdata(pdev);

	mdiobus_unregister(bus->mii_bus);
	mdiobus_free(bus->mii_bus);
	smi_en.u64 = 0;
	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
	return 0;
}

static const struct of_device_id octeon_mdiobus_match[] = {
	{
		.compatible = "cavium,octeon-3860-mdio",
	},
	{},
};
MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);

static struct platform_driver octeon_mdiobus_driver = {
	.driver = {
		.name		= KBUILD_MODNAME,
		.of_match_table = octeon_mdiobus_match,
	},
	.probe		= octeon_mdiobus_probe,
	.remove		= octeon_mdiobus_remove,
};

void octeon_mdiobus_force_mod_depencency(void)
{
	/* Let ethernet drivers force us to be loaded.  */
}
EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);

module_platform_driver(octeon_mdiobus_driver);

MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");