]> git.sur5r.net Git - u-boot/blob - board/compulab/common/eeprom.c
Merge branch 'iu-boot/master' into 'u-boot-arm/master'
[u-boot] / board / compulab / common / eeprom.c
1 /*
2  * (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
3  *
4  * Authors: Nikita Kiryanov <nikita@compulab.co.il>
5  *          Igor Grinberg <grinberg@compulab.co.il>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <i2c.h>
12
13 #define EEPROM_LAYOUT_VER_OFFSET        44
14 #define BOARD_SERIAL_OFFSET             20
15 #define BOARD_SERIAL_OFFSET_LEGACY      8
16 #define BOARD_REV_OFFSET                0
17 #define BOARD_REV_OFFSET_LEGACY         6
18 #define BOARD_REV_SIZE                  2
19 #define MAC_ADDR_OFFSET                 4
20 #define MAC_ADDR_OFFSET_LEGACY          0
21
22 #define LAYOUT_INVALID  0
23 #define LAYOUT_LEGACY   0xff
24
25 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
26
27 static int cl_eeprom_read(uint offset, uchar *buf, int len)
28 {
29         return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
30                         CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
31 }
32
33 static int cl_eeprom_setup_layout(void)
34 {
35         int res;
36
37         if (cl_eeprom_layout != LAYOUT_INVALID)
38                 return 0;
39
40         res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
41                              (uchar *)&cl_eeprom_layout, 1);
42         if (res) {
43                 cl_eeprom_layout = LAYOUT_INVALID;
44                 return res;
45         }
46
47         if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
48                 cl_eeprom_layout = LAYOUT_LEGACY;
49
50         return 0;
51 }
52
53 void get_board_serial(struct tag_serialnr *serialnr)
54 {
55         u32 serial[2];
56         uint offset;
57
58         memset(serialnr, 0, sizeof(*serialnr));
59
60         if (cl_eeprom_setup_layout())
61                 return;
62
63         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
64                 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
65
66         if (cl_eeprom_read(offset, (uchar *)serial, 8))
67                 return;
68
69         if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
70                 serialnr->low = serial[0];
71                 serialnr->high = serial[1];
72         }
73 }
74
75 /*
76  * Routine: cl_eeprom_read_mac_addr
77  * Description: read mac address and store it in buf.
78  */
79 int cl_eeprom_read_mac_addr(uchar *buf)
80 {
81         uint offset;
82
83         if (cl_eeprom_setup_layout())
84                 return 0;
85
86         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
87                         MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
88
89         return cl_eeprom_read(offset, buf, 6);
90 }
91
92 /*
93  * Routine: cl_eeprom_get_board_rev
94  * Description: read system revision from eeprom
95  */
96 u32 cl_eeprom_get_board_rev(void)
97 {
98         u32 rev = 0;
99         char str[5]; /* Legacy representation can contain at most 4 digits */
100         uint offset = BOARD_REV_OFFSET_LEGACY;
101
102         if (cl_eeprom_setup_layout())
103                 return 0;
104
105         if (cl_eeprom_layout != LAYOUT_LEGACY)
106                 offset = BOARD_REV_OFFSET;
107
108         if (cl_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
109                 return 0;
110
111         /*
112          * Convert legacy syntactic representation to semantic
113          * representation. i.e. for rev 1.00: 0x100 --> 0x64
114          */
115         if (cl_eeprom_layout == LAYOUT_LEGACY) {
116                 sprintf(str, "%x", rev);
117                 rev = simple_strtoul(str, NULL, 10);
118         }
119
120         return rev;
121 };