summaryrefslogtreecommitdiffstats
path: root/drivers/net/phy/mdio-ofgpio.c
blob: 2ff97754e574cffec278cb3a7188ca875524fd24 (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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
/*
 * OpenFirmware GPIO based MDIO bitbang driver.
 *
 * Copyright (c) 2008 CSE Semaphore Belgium.
 *  by Laurent Pinchart <laurentp@cse-semaphore.com>
 *
 * Based on earlier work by
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mdio-bitbang.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>

struct mdio_gpio_info {
	struct mdiobb_ctrl ctrl;
	int mdc, mdio;
};

static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
{
	struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

	if (dir)
		gpio_direction_output(bitbang->mdio, 1);
	else
		gpio_direction_input(bitbang->mdio);
}

static int mdio_read(struct mdiobb_ctrl *ctrl)
{
	struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

	return gpio_get_value(bitbang->mdio);
}

static void mdio(struct mdiobb_ctrl *ctrl, int what)
{
	struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

	gpio_set_value(bitbang->mdio, what);
}

static void mdc(struct mdiobb_ctrl *ctrl, int what)
{
	struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

	gpio_set_value(bitbang->mdc, what);
}

static struct mdiobb_ops mdio_gpio_ops = {
	.owner = THIS_MODULE,
	.set_mdc = mdc,
	.set_mdio_dir = mdio_dir,
	.set_mdio_data = mdio,
	.get_mdio_data = mdio_read,
};

static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
                                         struct device_node *np)
{
	struct mdio_gpio_info *bitbang = bus->priv;

	bitbang->mdc = of_get_gpio(np, 0);
	bitbang->mdio = of_get_gpio(np, 1);

	if (bitbang->mdc < 0 || bitbang->mdio < 0)
		return -ENODEV;

	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc);
	return 0;
}

static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
{
	const u32 *data;
	int len, id, irq;

	data = of_get_property(np, "reg", &len);
	if (!data || len != 4)
		return;

	id = *data;
	bus->phy_mask &= ~(1 << id);

	irq = of_irq_to_resource(np, 0, NULL);
	if (irq != NO_IRQ)
		bus->irq[id] = irq;
}

static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
                                        const struct of_device_id *match)
{
	struct device_node *np = NULL;
	struct mii_bus *new_bus;
	struct mdio_gpio_info *bitbang;
	int ret = -ENOMEM;
	int i;

	bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
	if (!bitbang)
		goto out;

	bitbang->ctrl.ops = &mdio_gpio_ops;

	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
	if (!new_bus)
		goto out_free_bitbang;

	new_bus->name = "GPIO Bitbanged MII",

	ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node);
	if (ret)
		goto out_free_bus;

	new_bus->phy_mask = ~0;
	new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
	if (!new_bus->irq)
		goto out_free_bus;

	for (i = 0; i < PHY_MAX_ADDR; i++)
		new_bus->irq[i] = -1;

	while ((np = of_get_next_child(ofdev->node, np)))
		if (!strcmp(np->type, "ethernet-phy"))
			add_phy(new_bus, np);

	new_bus->parent = &ofdev->dev;
	dev_set_drvdata(&ofdev->dev, new_bus);

	ret = mdiobus_register(new_bus);
	if (ret)
		goto out_free_irqs;

	return 0;

out_free_irqs:
	dev_set_drvdata(&ofdev->dev, NULL);
	kfree(new_bus->irq);
out_free_bus:
	free_mdio_bitbang(new_bus);
out_free_bitbang:
	kfree(bitbang);
out:
	return ret;
}

static int mdio_ofgpio_remove(struct of_device *ofdev)
{
	struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
	struct mdio_gpio_info *bitbang = bus->priv;

	mdiobus_unregister(bus);
	kfree(bus->irq);
	free_mdio_bitbang(bus);
	dev_set_drvdata(&ofdev->dev, NULL);
	kfree(bitbang);

	return 0;
}

static struct of_device_id mdio_ofgpio_match[] = {
	{
		.compatible = "virtual,mdio-gpio",
	},
	{},
};

static struct of_platform_driver mdio_ofgpio_driver = {
	.name = "mdio-gpio",
	.match_table = mdio_ofgpio_match,
	.probe = mdio_ofgpio_probe,
	.remove = mdio_ofgpio_remove,
};

static int mdio_ofgpio_init(void)
{
	return of_register_platform_driver(&mdio_ofgpio_driver);
}

static void mdio_ofgpio_exit(void)
{
	of_unregister_platform_driver(&mdio_ofgpio_driver);
}

module_init(mdio_ofgpio_init);
module_exit(mdio_ofgpio_exit);