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 #include <common.h>
  25
  26 #ifdef CONFIG_POST
  27
  28 /*
  29  * I2C test
  30  *
  31  * For verifying the I2C bus, a full I2C bus scanning is performed.
  32  *
  33  * #ifdef I2C_ADDR_LIST
  34  *   The test is considered as passed if all the devices and
  35  *   only the devices in the list are found.
  36  * #else [ ! I2C_ADDR_LIST ]
  37  *   The test is considered as passed if any I2C device is found.
  38  * #endif
  39  */
  40
  41 #include <post.h>
  42 #include <i2c.h>
  43
  44 #if CONFIG_POST & CFG_POST_I2C
  45
  46 int i2c_post_test (int flags)
  47 {
  48         unsigned int i;
  49         unsigned int good = 0;
  50 #ifdef I2C_ADDR_LIST
  51         unsigned int bad  = 0;
  52         int j;
  53         unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
  54         unsigned char i2c_miss_list[] = I2C_ADDR_LIST;
  55 #endif
  56
  57         for (i = 0; i < 128; i++) {
  58                 if (i2c_probe (i) == 0) {
  59 #ifndef I2C_ADDR_LIST
  60                         good++;
  61 #else   /* I2C_ADDR_LIST */
  62                         for (j=0; j<sizeof(i2c_addr_list); ++j) {
  63                                 if (i == i2c_addr_list[j]) {
  64                                         good++;
  65                                         i2c_miss_list[j] = 0xFF;
  66                                         break;
  67                                 }
  68                         }
  69                         if (j == sizeof(i2c_addr_list)) {
  70                                 bad++;
  71                                 post_log ("I2C: addr %02X not expected\n",
  72                                                 i);
  73                         }
  74 #endif  /* I2C_ADDR_LIST */
  75                 }
  76         }
  77
  78 #ifndef I2C_ADDR_LIST
  79         return good > 0 ? 0 : -1;
  80 #else   /* I2C_ADDR_LIST */
  81         if (good != sizeof(i2c_addr_list)) {
  82                 for (j=0; j<sizeof(i2c_miss_list); ++j) {
  83                         if (i2c_miss_list[j] != 0xFF) {
  84                                 post_log ("I2C: addr %02X did not respond\n",
  85                                                 i2c_miss_list[j]);
  86                         }
  87                 }
  88         }
  89         return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1;
  90 #endif
  91 }
  92
  93 #endif /* CONFIG_POST & CFG_POST_I2C */
  94 #endif /* CONFIG_POST */