aboutsummaryrefslogtreecommitdiff
path: root/common/miiphyutil.c
blob: 13b9c65dc8771668add77b8d88c7317ae4ad1443 (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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
/*
 * (C) Copyright 2001
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
 *
 * 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 as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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
 */

/*
 * This provides a bit-banged interface to the ethernet MII management
 * channel.
 */

#include <common.h>
#include <miiphy.h>

#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)

/*****************************************************************************
 *
 * Read the OUI, manufacture's model number, and revision number.
 *
 * OUI:     22 bits (unsigned int)
 * Model:    6 bits (unsigned char)
 * Revision: 4 bits (unsigned char)
 *
 * Returns:
 *   0 on success
 */
int miiphy_info (unsigned char addr,
		 unsigned int *oui,
		 unsigned char *model, unsigned char *rev)
{
	unsigned int reg = 0;
	unsigned short tmp;

	if (miiphy_read (addr, PHY_PHYIDR2, &tmp) != 0) {
#ifdef DEBUG
		puts ("PHY ID register 2 read failed\n");
#endif
		return (-1);
	}
	reg = tmp;

#ifdef DEBUG
	printf ("PHY_PHYIDR2 @ 0x%x = 0x%04x\n", addr, reg);
#endif
	if (reg == 0xFFFF) {
		/* No physical device present at this address */
		return (-1);
	}

	if (miiphy_read (addr, PHY_PHYIDR1, &tmp) != 0) {
#ifdef DEBUG
		puts ("PHY ID register 1 read failed\n");
#endif
		return (-1);
	}
	reg |= tmp << 16;
#ifdef DEBUG
	printf ("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
#endif
	*oui   =                 ( reg >> 10);
	*model = (unsigned char) ((reg >>  4) & 0x0000003F);
	*rev   = (unsigned char) ( reg        & 0x0000000F);
	return (0);
}


/*****************************************************************************
 *
 * Reset the PHY.
 * Returns:
 *   0 on success
 */
int miiphy_reset (unsigned char addr)
{
	unsigned short reg;
	int loop_cnt;

	if (miiphy_read (addr, PHY_BMCR, &reg) != 0) {
#ifdef DEBUG
		printf ("PHY status read failed\n");
#endif
		return (-1);
	}
	if (miiphy_write (addr, PHY_BMCR, reg | 0x8000) != 0) {
#ifdef DEBUG
		puts ("PHY reset failed\n");
#endif
		return (-1);
	}
#ifdef CONFIG_PHY_RESET_DELAY
	udelay (CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
#endif
	/*
	 * Poll the control register for the reset bit to go to 0 (it is
	 * auto-clearing).  This should happen within 0.5 seconds per the
	 * IEEE spec.
	 */
	loop_cnt = 0;
	reg = 0x8000;
	while (((reg & 0x8000) != 0) && (loop_cnt++ < 1000000)) {
		if (miiphy_read (addr, PHY_BMCR, &reg) != 0) {
#     ifdef DEBUG
			puts ("PHY status read failed\n");
#     endif
			return (-1);
		}
	}
	if ((reg & 0x8000) == 0) {
		return (0);
	} else {
		puts ("PHY reset timed out\n");
		return (-1);
	}
	return (0);
}


/*****************************************************************************
 *
 * Determine the ethernet speed (10/100).
 */
int miiphy_speed (unsigned char addr)
{
	unsigned short reg;

#if defined(CONFIG_PHY_GIGE)
	if (miiphy_read (addr, PHY_1000BTSR, &reg)) {
		printf ("PHY 1000BT Status read failed\n");
	} else {
		if (reg != 0xFFFF) {
			if ((reg & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) !=0) {
				return (_1000BASET);
			}
		}
	}
#endif /* CONFIG_PHY_GIGE */

	/* Check Basic Management Control Register first. */
	if (miiphy_read (addr, PHY_BMCR, &reg)) {
		puts ("PHY speed read failed, assuming 10bT\n");
		return (_10BASET);
	}
	/* Check if auto-negotiation is on. */
	if ((reg & PHY_BMCR_AUTON) != 0) {
		/* Get auto-negotiation results. */
		if (miiphy_read (addr, PHY_ANLPAR, &reg)) {
			puts ("PHY AN speed read failed, assuming 10bT\n");
			return (_10BASET);
		}
		if ((reg & PHY_ANLPAR_100) != 0) {
			return (_100BASET);
		} else {
			return (_10BASET);
		}
	}
	/* Get speed from basic control settings. */
	else if (reg & PHY_BMCR_100MB) {
		return (_100BASET);
	} else {
		return (_10BASET);
	}

}


/*****************************************************************************
 *
 * Determine full/half duplex.
 */
int miiphy_duplex (unsigned char addr)
{
	unsigned short reg;

#if defined(CONFIG_PHY_GIGE)
	if (miiphy_read (addr, PHY_1000BTSR, &reg)) {
		printf ("PHY 1000BT Status read failed\n");
	} else {
		if ( (reg != 0xFFFF) &&
		     (reg & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) ) {
			if ((reg & PHY_1000BTSR_1000FD) !=0) {
				return (FULL);
			} else {
				return (HALF);
			}
		}
	}
#endif /* CONFIG_PHY_GIGE */

	/* Check Basic Management Control Register first. */
	if (miiphy_read (addr, PHY_BMCR, &reg)) {
		puts ("PHY duplex read failed, assuming half duplex\n");
		return (HALF);
	}
	/* Check if auto-negotiation is on. */
	if ((reg & PHY_BMCR_AUTON) != 0) {
		/* Get auto-negotiation results. */
		if (miiphy_read (addr, PHY_ANLPAR, &reg)) {
			puts ("PHY AN duplex read failed, assuming half duplex\n");
			return (HALF);
		}

		if ((reg & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) != 0) {
			return (FULL);
		} else {
			return (HALF);
		}
	}
	/* Get speed from basic control settings. */
	else if (reg & PHY_BMCR_DPLX) {
		return (FULL);
	} else {
		return (HALF);
	}

}

#ifdef CFG_FAULT_ECHO_LINK_DOWN
/*****************************************************************************
 *
 * Determine link status
 */
int miiphy_link (unsigned char addr)
{
	unsigned short reg;

	/* dummy read; needed to latch some phys */
	(void)miiphy_read(addr, PHY_BMSR, &reg);
	if (miiphy_read (addr, PHY_BMSR, &reg)) {
		puts ("PHY_BMSR read failed, assuming no link\n");
		return (0);
	}

	/* Determine if a link is active */
	if ((reg & PHY_BMSR_LS) != 0) {
		return (1);
	} else {
		return (0);
	}
}
#endif

#endif /* CONFIG_MII || (CONFIG_COMMANDS & CFG_CMD_MII) */