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1badf2f4 TH |
1 | /* |
2 | * Copyright (C) 2014 Gateworks Corporation | |
3 | * Author: Tim Harvey <tharvey@gateworks.com> | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #include <common.h> | |
9 | #include <i2c.h> | |
10 | ||
11 | #include "gsc.h" | |
12 | #include "ventana_eeprom.h" | |
13 | ||
14 | /* read ventana EEPROM, check for validity, and return baseboard type */ | |
15 | int | |
16 | read_eeprom(int bus, struct ventana_board_info *info) | |
17 | { | |
18 | int i; | |
19 | int chksum; | |
20 | char baseboard; | |
21 | int type; | |
22 | unsigned char *buf = (unsigned char *)info; | |
23 | ||
24 | memset(info, 0, sizeof(*info)); | |
25 | ||
26 | /* | |
27 | * On a board with a missing/depleted backup battery for GSC, the | |
28 | * board may be ready to probe the GSC before its firmware is | |
29 | * running. We will wait here indefinately for the GSC/EEPROM. | |
30 | */ | |
31 | while (1) { | |
32 | if (0 == i2c_set_bus_num(bus) && | |
33 | 0 == i2c_probe(GSC_EEPROM_ADDR)) | |
34 | break; | |
35 | mdelay(1); | |
36 | } | |
37 | ||
38 | /* read eeprom config section */ | |
39 | if (gsc_i2c_read(GSC_EEPROM_ADDR, 0x00, 1, buf, sizeof(*info))) { | |
40 | puts("EEPROM: Failed to read EEPROM\n"); | |
41 | info->model[0] = 0; | |
42 | return GW_UNKNOWN; | |
43 | } | |
44 | ||
45 | /* sanity checks */ | |
46 | if (info->model[0] != 'G' || info->model[1] != 'W') { | |
47 | puts("EEPROM: Invalid Model in EEPROM\n"); | |
48 | info->model[0] = 0; | |
49 | return GW_UNKNOWN; | |
50 | } | |
51 | ||
52 | /* validate checksum */ | |
53 | for (chksum = 0, i = 0; i < sizeof(*info)-2; i++) | |
54 | chksum += buf[i]; | |
55 | if ((info->chksum[0] != chksum>>8) || | |
56 | (info->chksum[1] != (chksum&0xff))) { | |
57 | puts("EEPROM: Failed EEPROM checksum\n"); | |
58 | info->model[0] = 0; | |
59 | return GW_UNKNOWN; | |
60 | } | |
61 | ||
62 | /* original GW5400-A prototype */ | |
63 | baseboard = info->model[3]; | |
64 | if (strncasecmp((const char *)info->model, "GW5400-A", 8) == 0) | |
65 | baseboard = '0'; | |
66 | ||
67 | switch (baseboard) { | |
68 | case '0': /* original GW5400-A prototype */ | |
69 | type = GW54proto; | |
70 | break; | |
71 | case '1': | |
72 | type = GW51xx; | |
73 | break; | |
74 | case '2': | |
75 | type = GW52xx; | |
76 | break; | |
77 | case '3': | |
78 | type = GW53xx; | |
79 | break; | |
80 | case '4': | |
81 | type = GW54xx; | |
82 | break; | |
83 | default: | |
84 | printf("EEPROM: Unknown model in EEPROM: %s\n", info->model); | |
85 | type = GW_UNKNOWN; | |
86 | break; | |
87 | } | |
88 | return type; | |
89 | } |