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 73 /* No devices found */ 74 return -1; 75 #else 76 unsigned int ret = 0; 77 int j; 78 unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS; 79 80 /* Start at address 1, address 0 is the general call address */ 81 for (i = 1; i < 128; i++) { 82 if (i2c_ignore_device(i)) 83 continue; 84 if (i2c_probe(i) != 0) 85 continue; 86 87 for (j = 0; j < sizeof(i2c_addr_list); ++j) { 88 if (i == i2c_addr_list[j]) { 89 i2c_addr_list[j] = 0xff; 90 break; 91 } 92 } 93 94 if (j == sizeof(i2c_addr_list)) { 95 ret = -1; 96 post_log("I2C: addr %02x not expected\n", i); 97 } 98 } 99 100 for (i = 0; i < sizeof(i2c_addr_list); ++i) { 101 if (i2c_addr_list[i] == 0xff) 102 continue; 103 if (i2c_ignore_device(i2c_addr_list[i])) 104 continue; 105 post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]); 106 ret = -1; 107 } 108 109 return ret; 110 #endif 111 } 112 113 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */ 114