1 /* 2 * (c) Copyright 2011 by Tigris Elektronik GmbH 3 * 4 * Author: 5 * Maximilian Schwerin <mvs@tigris.de> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 12 #include <command.h> 13 #include <environment.h> 14 #include <linux/stddef.h> 15 #include <malloc.h> 16 #include <memalign.h> 17 #include <search.h> 18 #include <errno.h> 19 #include <fat.h> 20 #include <mmc.h> 21 22 #ifdef CONFIG_SPL_BUILD 23 /* TODO(sjg@chromium.org): Figure out why this is needed */ 24 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT) 25 # define LOADENV 26 # endif 27 #else 28 # define LOADENV 29 # if defined(CONFIG_CMD_SAVEENV) 30 # define CMD_SAVEENV 31 # endif 32 #endif 33 34 DECLARE_GLOBAL_DATA_PTR; 35 36 #ifdef CMD_SAVEENV 37 static int env_fat_save(void) 38 { 39 env_t env_new; 40 struct blk_desc *dev_desc = NULL; 41 disk_partition_t info; 42 int dev, part; 43 int err; 44 loff_t size; 45 46 err = env_export(&env_new); 47 if (err) 48 return err; 49 50 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 51 CONFIG_ENV_FAT_DEVICE_AND_PART, 52 &dev_desc, &info, 1); 53 if (part < 0) 54 return 1; 55 56 dev = dev_desc->devnum; 57 if (fat_set_blk_dev(dev_desc, &info) != 0) { 58 printf("\n** Unable to use %s %d:%d for saveenv **\n", 59 CONFIG_ENV_FAT_INTERFACE, dev, part); 60 return 1; 61 } 62 63 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t), 64 &size); 65 if (err == -1) { 66 printf("\n** Unable to write \"%s\" from %s%d:%d **\n", 67 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 68 return 1; 69 } 70 71 puts("done\n"); 72 return 0; 73 } 74 #endif /* CMD_SAVEENV */ 75 76 #ifdef LOADENV 77 static int env_fat_load(void) 78 { 79 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE); 80 struct blk_desc *dev_desc = NULL; 81 disk_partition_t info; 82 int dev, part; 83 int err; 84 85 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 86 CONFIG_ENV_FAT_DEVICE_AND_PART, 87 &dev_desc, &info, 1); 88 if (part < 0) 89 goto err_env_relocate; 90 91 dev = dev_desc->devnum; 92 if (fat_set_blk_dev(dev_desc, &info) != 0) { 93 printf("\n** Unable to use %s %d:%d for loading the env **\n", 94 CONFIG_ENV_FAT_INTERFACE, dev, part); 95 goto err_env_relocate; 96 } 97 98 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE); 99 if (err == -1) { 100 printf("\n** Unable to read \"%s\" from %s%d:%d **\n", 101 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 102 goto err_env_relocate; 103 } 104 105 env_import(buf, 1); 106 return 0; 107 108 err_env_relocate: 109 set_default_env(NULL); 110 111 return -EIO; 112 } 113 #endif /* LOADENV */ 114 115 U_BOOT_ENV_LOCATION(fat) = { 116 .location = ENVL_FAT, 117 ENV_NAME("FAT") 118 #ifdef LOADENV 119 .load = env_fat_load, 120 #endif 121 #ifdef CMD_SAVEENV 122 .save = env_save_ptr(env_fat_save), 123 #endif 124 }; 125