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Commit | Line | Data |
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1 | /* | |
2 | * (C) Copyright 2002 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | /* | |
9 | * I2C test | |
10 | * | |
11 | * For verifying the I2C bus, a full I2C bus scanning is performed. | |
12 | * | |
13 | * #ifdef CONFIG_SYS_POST_I2C_ADDRS | |
14 | * The test is considered as passed if all the devices and only the devices | |
15 | * in the list are found. | |
16 | * #ifdef CONFIG_SYS_POST_I2C_IGNORES | |
17 | * Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES. These devices | |
18 | * are optional or not vital to board functionality. | |
19 | * #endif | |
20 | * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ] | |
21 | * The test is considered as passed if any I2C device is found. | |
22 | * #endif | |
23 | */ | |
24 | ||
25 | #include <common.h> | |
26 | #include <post.h> | |
27 | #include <i2c.h> | |
28 | ||
29 | #if CONFIG_POST & CONFIG_SYS_POST_I2C | |
30 | ||
31 | static int i2c_ignore_device(unsigned int chip) | |
32 | { | |
33 | #ifdef CONFIG_SYS_POST_I2C_IGNORES | |
34 | const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES; | |
35 | int i; | |
36 | ||
37 | for (i = 0; i < sizeof(i2c_ignore_list); i++) | |
38 | if (i2c_ignore_list[i] == chip) | |
39 | return 1; | |
40 | #endif | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | int i2c_post_test (int flags) | |
46 | { | |
47 | unsigned int i; | |
48 | #ifndef CONFIG_SYS_POST_I2C_ADDRS | |
49 | /* Start at address 1, address 0 is the general call address */ | |
50 | for (i = 1; i < 128; i++) { | |
51 | if (i2c_ignore_device(i)) | |
52 | continue; | |
53 | if (i2c_probe (i) == 0) | |
54 | return 0; | |
55 | } | |
56 | ||
57 | /* No devices found */ | |
58 | return -1; | |
59 | #else | |
60 | unsigned int ret = 0; | |
61 | int j; | |
62 | unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS; | |
63 | ||
64 | /* Start at address 1, address 0 is the general call address */ | |
65 | for (i = 1; i < 128; i++) { | |
66 | if (i2c_ignore_device(i)) | |
67 | continue; | |
68 | if (i2c_probe(i) != 0) | |
69 | continue; | |
70 | ||
71 | for (j = 0; j < sizeof(i2c_addr_list); ++j) { | |
72 | if (i == i2c_addr_list[j]) { | |
73 | i2c_addr_list[j] = 0xff; | |
74 | break; | |
75 | } | |
76 | } | |
77 | ||
78 | if (j == sizeof(i2c_addr_list)) { | |
79 | ret = -1; | |
80 | post_log("I2C: addr %02x not expected\n", i); | |
81 | } | |
82 | } | |
83 | ||
84 | for (i = 0; i < sizeof(i2c_addr_list); ++i) { | |
85 | if (i2c_addr_list[i] == 0xff) | |
86 | continue; | |
87 | if (i2c_ignore_device(i2c_addr_list[i])) | |
88 | continue; | |
89 | post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]); | |
90 | ret = -1; | |
91 | } | |
92 | ||
93 | return ret; | |
94 | #endif | |
95 | } | |
96 | ||
97 | #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */ |