LXR uboot/post/drivers/i2c.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2002
   4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5 */
   6
   7/*
   8 * I2C test
   9 *
  10 * For verifying the I2C bus, a full I2C bus scanning is performed.
  11 *
  12 * #ifdef CONFIG_SYS_POST_I2C_ADDRS
  13 *   The test is considered as passed if all the devices and only the devices
  14 *   in the list are found.
  15 *   #ifdef CONFIG_SYS_POST_I2C_IGNORES
  16 *     Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES.  These devices
  17 *     are optional or not vital to board functionality.
  18 *   #endif
  19 * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
  20 *   The test is considered as passed if any I2C device is found.
  21 * #endif
  22 */
  23
  24#include <common.h>
  25#include <log.h>
  26#include <post.h>
  27#include <i2c.h>
  28
  29#if CONFIG_POST & CONFIG_SYS_POST_I2C
  30
  31static int i2c_ignore_device(unsigned int chip)
  32{
  33#ifdef CONFIG_SYS_POST_I2C_IGNORES
  34        const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
  35        int i;
  36
  37        for (i = 0; i < sizeof(i2c_ignore_list); i++)
  38                if (i2c_ignore_list[i] == chip)
  39                        return 1;
  40#endif
  41
  42        return 0;
  43}
  44
  45int i2c_post_test (int flags)
  46{
  47        unsigned int i;
  48#ifndef CONFIG_SYS_POST_I2C_ADDRS
  49        /* Start at address 1, address 0 is the general call address */
  50        for (i = 1; i < 128; i++) {
  51                if (i2c_ignore_device(i))
  52                        continue;
  53                if (i2c_probe (i) == 0)
  54                        return 0;
  55        }
  56
  57        /* No devices found */
  58        return -1;
  59#else
  60        unsigned int ret  = 0;
  61        int j;
  62        unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;
  63
  64        /* Start at address 1, address 0 is the general call address */
  65        for (i = 1; i < 128; i++) {
  66                if (i2c_ignore_device(i))
  67                        continue;
  68                if (i2c_probe(i) != 0)
  69                        continue;
  70
  71                for (j = 0; j < sizeof(i2c_addr_list); ++j) {
  72                        if (i == i2c_addr_list[j]) {
  73                                i2c_addr_list[j] = 0xff;
  74                                break;
  75                        }
  76                }
  77
  78                if (j == sizeof(i2c_addr_list)) {
  79                        ret = -1;
  80                        post_log("I2C: addr %02x not expected\n", i);
  81                }
  82        }
  83
  84        for (i = 0; i < sizeof(i2c_addr_list); ++i) {
  85                if (i2c_addr_list[i] == 0xff)
  86                        continue;
  87                if (i2c_ignore_device(i2c_addr_list[i]))
  88                        continue;
  89                post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
  90                ret = -1;
  91        }
  92
  93        return ret;
  94#endif
  95}
  96
  97#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */
  98