xref: /openbmc/u-boot/post/drivers/i2c.c (revision b9b1bc8542db5f26453c45db843903dee7056244)
1 /*
2  * (C) Copyright 2002
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 /*
25  * I2C test
26  *
27  * For verifying the I2C bus, a full I2C bus scanning is performed.
28  *
29  * #ifdef I2C_ADDR_LIST
30  *   The test is considered as passed if all the devices and
31  *   only the devices in the list are found.
32  * #else [ ! I2C_ADDR_LIST ]
33  *   The test is considered as passed if any I2C device is found.
34  * #endif
35  */
36 
37 #include <common.h>
38 #include <post.h>
39 #include <i2c.h>
40 
41 #if CONFIG_POST & CONFIG_SYS_POST_I2C
42 
43 int i2c_post_test (int flags)
44 {
45 	unsigned int i;
46 #ifndef I2C_ADDR_LIST
47 	for (i = 0; i < 128; i++)
48 		if (i2c_probe (i) == 0)
49 			return 0;
50 
51 	/* No devices found */
52 	return -1;
53 #else
54 	unsigned int good = 0;
55 	unsigned int bad  = 0;
56 	int j;
57 	unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
58 	unsigned char i2c_miss_list[] = I2C_ADDR_LIST;
59 
60 	for (i = 0; i < 128; i++) {
61 		if (i2c_probe(i) != 0)
62 			continue;
63 		for (j = 0; j < sizeof(i2c_addr_list); ++j) {
64 			if (i == i2c_addr_list[j]) {
65 				good++;
66 				i2c_miss_list[j] = 0xFF;
67 				break;
68 			}
69 		}
70 
71 		if (j == sizeof(i2c_addr_list)) {
72 			bad++;
73 			post_log("I2C: addr %02X not expected\n", i);
74 		}
75 	}
76 
77 	if (good != sizeof(i2c_addr_list)) {
78 		for (j = 0; j < sizeof(i2c_miss_list); ++j) {
79 			if (i2c_miss_list[j] != 0xFF) {
80 				post_log("I2C: addr %02X did not respond\n",
81 						i2c_miss_list[j]);
82 			}
83 		}
84 	}
85 	return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1;
86 #endif
87 }
88 
89 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */
90