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