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bootloader/u-boot_2015_04/post/drivers/i2c.c 2.1 KB
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  /*
   * (C) Copyright 2002
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * 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
  ", 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
  ", i2c_addr_list[i]);
  		ret = -1;
  	}
  
  	return ret;
  #endif
  }
  
  #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */