summaryrefslogtreecommitdiff
path: root/drivers/net/phy/mdio_device.c
blob: 887076292e50fa9f5338b4658eb995760b739c5b (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
205
206
207
// SPDX-License-Identifier: GPL-2.0+
/* Framework for MDIO devices, other than PHYs.
 *
 * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mdio.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/delay.h>

void mdio_device_free(struct mdio_device *mdiodev)
{
	put_device(&mdiodev->dev);
}
EXPORT_SYMBOL(mdio_device_free);

static void mdio_device_release(struct device *dev)
{
	kfree(to_mdio_device(dev));
}

int mdio_device_bus_match(struct device *dev, struct device_driver *drv)
{
	struct mdio_device *mdiodev = to_mdio_device(dev);
	struct mdio_driver *mdiodrv = to_mdio_driver(drv);

	if (mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)
		return 0;

	return strcmp(mdiodev->modalias, drv->name) == 0;
}

struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr)
{
	struct mdio_device *mdiodev;

	/* We allocate the device, and initialize the default values */
	mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL);
	if (!mdiodev)
		return ERR_PTR(-ENOMEM);

	mdiodev->dev.release = mdio_device_release;
	mdiodev->dev.parent = &bus->dev;
	mdiodev->dev.bus = &mdio_bus_type;
	mdiodev->device_free = mdio_device_free;
	mdiodev->device_remove = mdio_device_remove;
	mdiodev->bus = bus;
	mdiodev->addr = addr;

	dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);

	device_initialize(&mdiodev->dev);

	return mdiodev;
}
EXPORT_SYMBOL(mdio_device_create);

/**
 * mdio_device_register - Register the mdio device on the MDIO bus
 * @mdiodev: mdio_device structure to be added to the MDIO bus
 */
int mdio_device_register(struct mdio_device *mdiodev)
{
	int err;

	dev_dbg(&mdiodev->dev, "mdio_device_register\n");

	err = mdiobus_register_device(mdiodev);
	if (err)
		return err;

	err = device_add(&mdiodev->dev);
	if (err) {
		pr_err("MDIO %d failed to add\n", mdiodev->addr);
		goto out;
	}

	return 0;

 out:
	mdiobus_unregister_device(mdiodev);
	return err;
}
EXPORT_SYMBOL(mdio_device_register);

/**
 * mdio_device_remove - Remove a previously registered mdio device from the
 *			MDIO bus
 * @mdiodev: mdio_device structure to remove
 *
 * This doesn't free the mdio_device itself, it merely reverses the effects
 * of mdio_device_register(). Use mdio_device_free() to free the device
 * after calling this function.
 */
void mdio_device_remove(struct mdio_device *mdiodev)
{
	device_del(&mdiodev->dev);
	mdiobus_unregister_device(mdiodev);
}
EXPORT_SYMBOL(mdio_device_remove);

void mdio_device_reset(struct mdio_device *mdiodev, int value)
{
	unsigned int d;

	if (!mdiodev->reset)
		return;

	gpiod_set_value(mdiodev->reset, value);

	d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay;
	if (d)
		usleep_range(d, d + max_t(unsigned int, d / 10, 100));
}
EXPORT_SYMBOL(mdio_device_reset);

/**
 * mdio_probe - probe an MDIO device
 * @dev: device to probe
 *
 * Description: Take care of setting up the mdio_device structure
 * and calling the driver to probe the device.
 */
static int mdio_probe(struct device *dev)
{
	struct mdio_device *mdiodev = to_mdio_device(dev);
	struct device_driver *drv = mdiodev->dev.driver;
	struct mdio_driver *mdiodrv = to_mdio_driver(drv);
	int err = 0;

	if (mdiodrv->probe) {
		/* Deassert the reset signal */
		mdio_device_reset(mdiodev, 0);

		err = mdiodrv->probe(mdiodev);
		if (err) {
			/* Assert the reset signal */
			mdio_device_reset(mdiodev, 1);
		}
	}

	return err;
}

static int mdio_remove(struct device *dev)
{
	struct mdio_device *mdiodev = to_mdio_device(dev);
	struct device_driver *drv = mdiodev->dev.driver;
	struct mdio_driver *mdiodrv = to_mdio_driver(drv);

	if (mdiodrv->remove) {
		mdiodrv->remove(mdiodev);

		/* Assert the reset signal */
		mdio_device_reset(mdiodev, 1);
	}

	return 0;
}

/**
 * mdio_driver_register - register an mdio_driver with the MDIO layer
 * @new_driver: new mdio_driver to register
 */
int mdio_driver_register(struct mdio_driver *drv)
{
	struct mdio_driver_common *mdiodrv = &drv->mdiodrv;
	int retval;

	pr_debug("mdio_driver_register: %s\n", mdiodrv->driver.name);

	mdiodrv->driver.bus = &mdio_bus_type;
	mdiodrv->driver.probe = mdio_probe;
	mdiodrv->driver.remove = mdio_remove;

	retval = driver_register(&mdiodrv->driver);
	if (retval) {
		pr_err("%s: Error %d in registering driver\n",
		       mdiodrv->driver.name, retval);

		return retval;
	}

	return 0;
}
EXPORT_SYMBOL(mdio_driver_register);

void mdio_driver_unregister(struct mdio_driver *drv)
{
	struct mdio_driver_common *mdiodrv = &drv->mdiodrv;

	driver_unregister(&mdiodrv->driver);
}
EXPORT_SYMBOL(mdio_driver_unregister);