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 /* 27 * I2C test 28 * 29 * For verifying the I2C bus, a full I2C bus scanning is performed. 30 * 31 * #ifdef I2C_ADDR_LIST 32 * The test is considered as passed if all the devices and 33 * only the devices in the list are found. 34 * #else [ ! I2C_ADDR_LIST ] 35 * The test is considered as passed if any I2C device is found. 36 * #endif 37 */ 38 39 #include <post.h> 40 #include <i2c.h> 41 42 #if CONFIG_POST & CONFIG_SYS_POST_I2C 43 44 int i2c_post_test (int flags) 45 { 46 unsigned int i; 47 unsigned int good = 0; 48 #ifdef I2C_ADDR_LIST 49 unsigned int bad = 0; 50 int j; 51 unsigned char i2c_addr_list[] = I2C_ADDR_LIST; 52 unsigned char i2c_miss_list[] = I2C_ADDR_LIST; 53 #endif 54 55 for (i = 0; i < 128; i++) { 56 if (i2c_probe (i) == 0) { 57 #ifndef I2C_ADDR_LIST 58 good++; 59 #else /* I2C_ADDR_LIST */ 60 for (j=0; j<sizeof(i2c_addr_list); ++j) { 61 if (i == i2c_addr_list[j]) { 62 good++; 63 i2c_miss_list[j] = 0xFF; 64 break; 65 } 66 } 67 if (j == sizeof(i2c_addr_list)) { 68 bad++; 69 post_log ("I2C: addr %02X not expected\n", 70 i); 71 } 72 #endif /* I2C_ADDR_LIST */ 73 } 74 } 75 76 #ifndef I2C_ADDR_LIST 77 return good > 0 ? 0 : -1; 78 #else /* I2C_ADDR_LIST */ 79 if (good != sizeof(i2c_addr_list)) { 80 for (j=0; j<sizeof(i2c_miss_list); ++j) { 81 if (i2c_miss_list[j] != 0xFF) { 82 post_log ("I2C: addr %02X did not respond\n", 83 i2c_miss_list[j]); 84 } 85 } 86 } 87 return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1; 88 #endif 89 } 90 91 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */ 92