| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |