summaryrefslogtreecommitdiffstats
path: root/post/drivers/i2c.c
blob: 4cbd9f3703f8f2b9f47cf9ad0626a2dbdbf281dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * I2C test
 *
 * For verifying the I2C bus, a full I2C bus scanning is performed.
 *
 * #ifdef CONFIG_SYS_POST_I2C_ADDRS
 *   The test is considered as passed if all the devices and only the devices
 *   in the list are found.
 *   #ifdef CONFIG_SYS_POST_I2C_IGNORES
 *     Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES.  These devices
 *     are optional or not vital to board functionality.
 *   #endif
 * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
 *   The test is considered as passed if any I2C device is found.
 * #endif
 */

#include <common.h>
#include <post.h>
#include <i2c.h>

#if CONFIG_POST & CONFIG_SYS_POST_I2C

static int i2c_ignore_device(unsigned int chip)
{
#ifdef CONFIG_SYS_POST_I2C_IGNORES
	const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
	int i;

	for (i = 0; i < sizeof(i2c_ignore_list); i++)
		if (i2c_ignore_list[i] == chip)
			return 1;
#endif

	return 0;
}

int i2c_post_test (int flags)
{
	unsigned int i;
#ifndef CONFIG_SYS_POST_I2C_ADDRS
	/* Start at address 1, address 0 is the general call address */
	for (i = 1; i < 128; i++) {
		if (i2c_ignore_device(i))
			continue;
		if (i2c_probe (i) == 0)
			return 0;
	}

	/* No devices found */
	return -1;
#else
	unsigned int ret  = 0;
	int j;
	unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;

	/* Start at address 1, address 0 is the general call address */
	for (i = 1; i < 128; i++) {
		if (i2c_ignore_device(i))
			continue;
		if (i2c_probe(i) != 0)
			continue;

		for (j = 0; j < sizeof(i2c_addr_list); ++j) {
			if (i == i2c_addr_list[j]) {
				i2c_addr_list[j] = 0xff;
				break;
			}
		}

		if (j == sizeof(i2c_addr_list)) {
			ret = -1;
			post_log("I2C: addr %02x not expected\n", i);
		}
	}

	for (i = 0; i < sizeof(i2c_addr_list); ++i) {
		if (i2c_addr_list[i] == 0xff)
			continue;
		post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
		ret = -1;
	}

	return ret;
#endif
}

#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */
OpenPOWER on IntegriCloud