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
|
/*
* (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Nikita Kiryanov <nikita@compulab.co.il>
* Igor Grinberg <grinberg@compulab.co.il>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#ifndef CONFIG_SYS_I2C_EEPROM_ADDR
# define CONFIG_SYS_I2C_EEPROM_ADDR 0x50
# define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
#endif
#define EEPROM_LAYOUT_VER_OFFSET 44
#define BOARD_SERIAL_OFFSET 20
#define BOARD_SERIAL_OFFSET_LEGACY 8
#define BOARD_REV_OFFSET 0
#define BOARD_REV_OFFSET_LEGACY 6
#define BOARD_REV_SIZE 2
#define MAC_ADDR_OFFSET 4
#define MAC_ADDR_OFFSET_LEGACY 0
#define LAYOUT_INVALID 0
#define LAYOUT_LEGACY 0xff
static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
static int cl_eeprom_read(uint offset, uchar *buf, int len)
{
int res;
unsigned int current_i2c_bus = i2c_get_bus_num();
res = i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
if (res < 0)
return res;
res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
i2c_set_bus_num(current_i2c_bus);
return res;
}
static int cl_eeprom_setup_layout(void)
{
int res;
if (cl_eeprom_layout != LAYOUT_INVALID)
return 0;
res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
(uchar *)&cl_eeprom_layout, 1);
if (res) {
cl_eeprom_layout = LAYOUT_INVALID;
return res;
}
if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
cl_eeprom_layout = LAYOUT_LEGACY;
return 0;
}
void get_board_serial(struct tag_serialnr *serialnr)
{
u32 serial[2];
uint offset;
memset(serialnr, 0, sizeof(*serialnr));
if (cl_eeprom_setup_layout())
return;
offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
if (cl_eeprom_read(offset, (uchar *)serial, 8))
return;
if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
serialnr->low = serial[0];
serialnr->high = serial[1];
}
}
/*
* Routine: cl_eeprom_read_mac_addr
* Description: read mac address and store it in buf.
*/
int cl_eeprom_read_mac_addr(uchar *buf)
{
uint offset;
if (cl_eeprom_setup_layout())
return 0;
offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
return cl_eeprom_read(offset, buf, 6);
}
/*
* Routine: cl_eeprom_get_board_rev
* Description: read system revision from eeprom
*/
u32 cl_eeprom_get_board_rev(void)
{
u32 rev = 0;
char str[5]; /* Legacy representation can contain at most 4 digits */
uint offset = BOARD_REV_OFFSET_LEGACY;
if (cl_eeprom_setup_layout())
return 0;
if (cl_eeprom_layout != LAYOUT_LEGACY)
offset = BOARD_REV_OFFSET;
if (cl_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
return 0;
/*
* Convert legacy syntactic representation to semantic
* representation. i.e. for rev 1.00: 0x100 --> 0x64
*/
if (cl_eeprom_layout == LAYOUT_LEGACY) {
sprintf(str, "%x", rev);
rev = simple_strtoul(str, NULL, 10);
}
return rev;
};
|
