1 /* 2 * (C) Copyright 2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * I2C test 10 * 11 * For verifying the I2C bus, a full I2C bus scanning is performed. 12 * 13 * #ifdef CONFIG_SYS_POST_I2C_ADDRS 14 * The test is considered as passed if all the devices and only the devices 15 * in the list are found. 16 * #ifdef CONFIG_SYS_POST_I2C_IGNORES 17 * Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES. These devices 18 * are optional or not vital to board functionality. 19 * #endif 20 * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ] 21 * The test is considered as passed if any I2C device is found. 22 * #endif 23 */ 24 25 #include <common.h> 26 #include <post.h> 27 #include <i2c.h> 28 29 #if CONFIG_POST & CONFIG_SYS_POST_I2C 30 31 static 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 45 int 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