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/*
* (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;
if (i2c_ignore_device(i2c_addr_list[i]))
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 */
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