post/drivers/i2c.c

   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 CONFIG_SYS_POST_I2C_ADDRS
  30  *   The test is considered as passed if all the devices and only the devices
  31  *   in the list are found.
  32  *   #ifdef CONFIG_SYS_POST_I2C_IGNORES
  33  *     Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES.  These devices
  34  *     are optional or not vital to board functionality.
  35  *   #endif
  36  * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
  37  *   The test is considered as passed if any I2C device is found.
  38  * #endif
  39  */
  40
  41 #include <common.h>
  42 #include <post.h>
  43 #include <i2c.h>
  44
  45 #if CONFIG_POST & CONFIG_SYS_POST_I2C
  46
  47 static int i2c_ignore_device(unsigned int chip)
  48 {
  49 #ifdef CONFIG_SYS_POST_I2C_IGNORES
  50         const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
  51         int i;
  52
  53         for (i = 0; i < sizeof(i2c_ignore_list); i++)
  54                 if (i2c_ignore_list[i] == chip)
  55                         return 1;
  56 #endif
  57
  58         return 0;
  59 }
  60
  61 int i2c_post_test (int flags)
  62 {
  63         unsigned int i;
  64 #ifndef CONFIG_SYS_POST_I2C_ADDRS
  65         /* Start at address 1, address 0 is the general call address */
  66         for (i = 1; i < 128; i++)
  67                 if (i2c_ignore_device(i))
  68                         continue;
  69                 if (i2c_probe (i) == 0)
  70                         return 0;
  71
  72         /* No devices found */
  73         return -1;
  74 #else
  75         unsigned int ret  = 0;
  76         int j;
  77         const unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;
  78
  79         /* Start at address 1, address 0 is the general call address */
  80         for (i = 1; i < 128; i++) {
  81                 if (i2c_ignore_device(i))
  82                         continue;
  83                 if (i2c_probe(i) != 0)
  84                         continue;
  85
  86                 for (j = 0; j < sizeof(i2c_addr_list); ++j) {
  87                         if (i == i2c_addr_list[j]) {
  88                                 i2c_addr_list[j] = 0xff;
  89                                 break;
  90                         }
  91                 }
  92
  93                 if (j == sizeof(i2c_addr_list)) {
  94                         ret = -1;
  95                         post_log("I2C: addr %02x not expected\n", i);
  96                 }
  97         }
  98
  99         for (i = 0; i < sizeof(i2c_addr_list); ++i) {
 100                 if (i2c_addr_list[i] == 0xff)
 101                         continue;
 102                 post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
 103                 ret = -1;
 104         }
 105
 106         return ret;
 107 #endif
 108 }
 109
 110 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */