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Merge branch 'master' of git://git.denx.de/u-boot-blackfin
[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 #ifndef CONFIG_SYS_I2C_EEPROM_ADDR
14 # define CONFIG_SYS_I2C_EEPROM_ADDR     0x50
15 # define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
16 #endif
17
18 #ifndef CONFIG_SYS_I2C_EEPROM_BUS
19 #define CONFIG_SYS_I2C_EEPROM_BUS       0
20 #endif
21
22 #define EEPROM_LAYOUT_VER_OFFSET        44
23 #define BOARD_SERIAL_OFFSET             20
24 #define BOARD_SERIAL_OFFSET_LEGACY      8
25 #define BOARD_REV_OFFSET                0
26 #define BOARD_REV_OFFSET_LEGACY         6
27 #define BOARD_REV_SIZE                  2
28 #define MAC_ADDR_OFFSET                 4
29 #define MAC_ADDR_OFFSET_LEGACY          0
30
31 #define LAYOUT_INVALID  0
32 #define LAYOUT_LEGACY   0xff
33
34 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
35
36 static int cl_eeprom_read(uint offset, uchar *buf, int len)
37 {
38         int res;
39         unsigned int current_i2c_bus = i2c_get_bus_num();
40
41         res = i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
42         if (res < 0)
43                 return res;
44
45         res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
46                         CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
47
48         i2c_set_bus_num(current_i2c_bus);
49
50         return res;
51 }
52
53 static int cl_eeprom_setup_layout(void)
54 {
55         int res;
56
57         if (cl_eeprom_layout != LAYOUT_INVALID)
58                 return 0;
59
60         res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
61                              (uchar *)&cl_eeprom_layout, 1);
62         if (res) {
63                 cl_eeprom_layout = LAYOUT_INVALID;
64                 return res;
65         }
66
67         if (cl_eeprom_layout == 0 || cl_eeprom_layout >= 0x20)
68                 cl_eeprom_layout = LAYOUT_LEGACY;
69
70         return 0;
71 }
72
73 void get_board_serial(struct tag_serialnr *serialnr)
74 {
75         u32 serial[2];
76         uint offset;
77
78         memset(serialnr, 0, sizeof(*serialnr));
79
80         if (cl_eeprom_setup_layout())
81                 return;
82
83         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
84                 BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
85
86         if (cl_eeprom_read(offset, (uchar *)serial, 8))
87                 return;
88
89         if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
90                 serialnr->low = serial[0];
91                 serialnr->high = serial[1];
92         }
93 }
94
95 /*
96  * Routine: cl_eeprom_read_mac_addr
97  * Description: read mac address and store it in buf.
98  */
99 int cl_eeprom_read_mac_addr(uchar *buf)
100 {
101         uint offset;
102
103         if (cl_eeprom_setup_layout())
104                 return 0;
105
106         offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
107                         MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
108
109         return cl_eeprom_read(offset, buf, 6);
110 }
111
112 static u32 board_rev;
113
114 /*
115  * Routine: cl_eeprom_get_board_rev
116  * Description: read system revision from eeprom
117  */
118 u32 cl_eeprom_get_board_rev(void)
119 {
120         char str[5]; /* Legacy representation can contain at most 4 digits */
121         uint offset = BOARD_REV_OFFSET_LEGACY;
122
123         if (board_rev)
124                 return board_rev;
125
126         if (cl_eeprom_setup_layout())
127                 return 0;
128
129         if (cl_eeprom_layout != LAYOUT_LEGACY)
130                 offset = BOARD_REV_OFFSET;
131
132         if (cl_eeprom_read(offset, (uchar *)&board_rev, BOARD_REV_SIZE))
133                 return 0;
134
135         /*
136          * Convert legacy syntactic representation to semantic
137          * representation. i.e. for rev 1.00: 0x100 --> 0x64
138          */
139         if (cl_eeprom_layout == LAYOUT_LEGACY) {
140                 sprintf(str, "%x", board_rev);
141                 board_rev = simple_strtoul(str, NULL, 10);
142         }
143
144         return board_rev;
145 };