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
|
/*
* (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;
/*
* Trick: we are reading two 16 registers into a 32 bit variable
* so we do a 16 read into the high order bits of the variable (big
* endian, you know), shift it down 16 bits, and the read the rest.
*/
if (miiphy_read (addr, PHY_PHYIDR2, (unsigned short *) ®) != 0) {
#ifdef DEBUG
printf ("PHY ID register 2 read failed\n");
#endif
return (-1);
}
reg >>= 16;
#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, (unsigned short *) ®) != 0) {
#ifdef DEBUG
printf ("PHY ID register 1 read failed\n");
#endif
return (-1);
}
#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_write (addr, PHY_BMCR, 0x8000) != 0) {
#ifdef DEBUG
printf ("PHY reset failed\n");
#endif
return (-1);
}
/*
* 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, ®) != 0) {
# ifdef DEBUG
printf ("PHY status read failed\n");
# endif
return (-1);
}
}
if ((reg & 0x8000) == 0) {
return (0);
} else {
printf ("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 (miiphy_read (addr, PHY_ANLPAR, ®)) {
printf ("PHY speed1 read failed, assuming 10bT\n");
return (_10BASET);
}
if ((reg & PHY_ANLPAR_100) != 0) {
return (_100BASET);
} else {
return (_10BASET);
}
}
/*****************************************************************************
*
* Determine full/half duplex.
*/
int miiphy_duplex (unsigned char addr)
{
unsigned short reg;
if (miiphy_read (addr, PHY_ANLPAR, ®)) {
printf ("PHY duplex read failed, assuming half duplex\n");
return (HALF);
}
if ((reg & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) != 0) {
return (FULL);
} else {
return (HALF);
}
}
#endif /* CONFIG_MII || (CONFIG_COMMANDS & CFG_CMD_MII) */
|
