summaryrefslogtreecommitdiffstats
path: root/drivers/net/miidev.c
blob: 343eb406e02cc38386bb2927448f31b6b5aaf144 (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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*
 * miidev.c - generic phy abstraction
 *
 * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <common.h>
#include <driver.h>
#include <init.h>
#include <miidev.h>
#include <clock.h>
#include <net.h>
#include <malloc.h>

int miidev_restart_aneg(struct mii_device *mdev)
{
	uint16_t status;
	int timeout;

	/*
	 * Reset PHY, then delay 300ns
	 */
	mii_write(mdev, mdev->address, MII_BMCR, BMCR_RESET);

	if (mdev->flags & MIIDEV_FORCE_LINK)
		return 0;

	udelay(1000);

	if (mdev->flags & MIIDEV_FORCE_10) {
		printf("Forcing 10 Mbps ethernet link... ");
		status = mii_read(mdev, mdev->address, MII_BMSR);
		mii_write(mdev, mdev->address, MII_BMCR, BMCR_FULLDPLX | BMCR_CTST);

		timeout = 20;
		do {	/* wait for link status to go down */
			udelay(10000);
			if ((timeout--) == 0) {
				debug("hmmm, should not have waited...");
				break;
			}
			status = mii_read(mdev, mdev->address, MII_BMSR);
		} while (status & BMSR_LSTATUS);

	} else {	/* MII100 */
		/*
		 * Set the auto-negotiation advertisement register bits
		 */
		status = mii_read(mdev, mdev->address, MII_ADVERTISE);
		status |= ADVERTISE_ALL;
		mii_write(mdev, mdev->address, MII_ADVERTISE, status);

		mii_write(mdev, mdev->address, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
	}

	return 0;
}

int miidev_wait_aneg(struct mii_device *mdev)
{
	uint64_t start;
	int status;

	if (mdev->flags & MIIDEV_FORCE_LINK)
		return 0;

	/*
	 * Wait for AN completion
	 */
	start = get_time_ns();
	do {
		if (is_timeout(start, 5 * SECOND)) {
			printf("%s: Autonegotiation timeout\n", mdev->cdev.name);
			return -1;
		}

		status = mii_read(mdev, mdev->address, MII_BMSR);
		if (status < 0) {
			printf("%s: Autonegotiation failed. status: 0x%04x\n", mdev->cdev.name, status);
			return -1;
		}
	} while (!(status & BMSR_LSTATUS));

	return 0;
}

int miidev_print_status(struct mii_device *mdev)
{
	int bmsr, bmcr, lpa;
	char *duplex;
	int speed;

	if (mdev->flags & MIIDEV_FORCE_LINK) {
		printf("Forcing link present...\n");
		return 0;
	}

	bmsr = mii_read(mdev, mdev->address, MII_BMSR);
	if (bmsr < 0)
		goto err_out;
	bmcr = mii_read(mdev, mdev->address, MII_BMCR);
	if (bmcr < 0)
		goto err_out;
	lpa = mii_read(mdev, mdev->address, MII_LPA);
	if (lpa < 0)
		goto err_out;

	printf("%s: Link is %s", mdev->cdev.name,
			bmsr & BMSR_LSTATUS ? "up" : "down");

	if (bmcr & BMCR_ANENABLE) {
		duplex = lpa & LPA_DUPLEX ? "Full" : "Half";
		speed = lpa & LPA_100 ? 100 : 10;
	} else {
		duplex = bmcr & BMCR_FULLDPLX ? "Full" : "Half";
		speed = bmcr & BMCR_SPEED100 ? 100 : 10;
	}

	printf(" - %d/%s\n", speed, duplex);

	return 0;
err_out:
	printf("%s: failed to read\n", mdev->cdev.name);
	return -1;
}

static ssize_t miidev_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags)
{
	int i = count;
	uint16_t *buf = _buf;
	struct mii_device *mdev = cdev->priv;

	while (i > 1) {
		*buf = mii_read(mdev, mdev->address, offset);
		buf++;
		i -= 2;
		offset++;
	}

	return count;
}

static ssize_t miidev_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags)
{
	int i = count;
	const uint16_t *buf = _buf;
	struct mii_device *mdev = cdev->priv;

	while (i > 1) {
		mii_write(mdev, mdev->address, offset, *buf);
		buf++;
		i -= 2;
		offset++;
	}

	return count;
}

static struct file_operations miidev_ops = {
	.read  = miidev_read,
	.write = miidev_write,
	.lseek = dev_lseek_default,
};

static int miidev_probe(struct device_d *dev)
{
	struct mii_device *mdev = dev->priv;

	mdev->cdev.name = asprintf("phy%d", dev->id);
	mdev->cdev.size = 32;
	mdev->cdev.ops = &miidev_ops;
	mdev->cdev.priv = mdev;
	mdev->cdev.dev = dev;
	devfs_create(&mdev->cdev);
	return 0;
}

static void miidev_remove(struct device_d *dev)
{
	struct mii_device *mdev = dev->priv;

	free(mdev->cdev.name);
	devfs_remove(&mdev->cdev);
}

static struct driver_d miidev_drv = {
        .name  = "miidev",
        .probe = miidev_probe,
	.remove = miidev_remove,
};

int mii_register(struct mii_device *mdev)
{
	mdev->dev.priv = mdev;
	strcpy(mdev->dev.name, "miidev");

	return register_device(&mdev->dev);
}

void mii_unregister(struct mii_device *mdev)
{
	unregister_device(&mdev->dev);
}

static int miidev_init(void)
{
	register_driver(&miidev_drv);
	return 0;
}

device_initcall(miidev_init);