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 char *env_name_spec = "FAT"; 35 36 env_t *env_ptr; 37 38 DECLARE_GLOBAL_DATA_PTR; 39 40 int env_init(void) 41 { 42 /* use default */ 43 gd->env_addr = (ulong)&default_environment[0]; 44 gd->env_valid = ENV_VALID; 45 46 return 0; 47 } 48 49 #ifdef CMD_SAVEENV 50 int saveenv(void) 51 { 52 env_t env_new; 53 struct blk_desc *dev_desc = NULL; 54 disk_partition_t info; 55 int dev, part; 56 int err; 57 loff_t size; 58 59 err = env_export(&env_new); 60 if (err) 61 return err; 62 63 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 64 CONFIG_ENV_FAT_DEVICE_AND_PART, 65 &dev_desc, &info, 1); 66 if (part < 0) 67 return 1; 68 69 dev = dev_desc->devnum; 70 if (fat_set_blk_dev(dev_desc, &info) != 0) { 71 printf("\n** Unable to use %s %d:%d for saveenv **\n", 72 CONFIG_ENV_FAT_INTERFACE, dev, part); 73 return 1; 74 } 75 76 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t), 77 &size); 78 if (err == -1) { 79 printf("\n** Unable to write \"%s\" from %s%d:%d **\n", 80 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 81 return 1; 82 } 83 84 puts("done\n"); 85 return 0; 86 } 87 #endif /* CMD_SAVEENV */ 88 89 #ifdef LOADENV 90 void env_relocate_spec(void) 91 { 92 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE); 93 struct blk_desc *dev_desc = NULL; 94 disk_partition_t info; 95 int dev, part; 96 int err; 97 98 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 99 CONFIG_ENV_FAT_DEVICE_AND_PART, 100 &dev_desc, &info, 1); 101 if (part < 0) 102 goto err_env_relocate; 103 104 dev = dev_desc->devnum; 105 if (fat_set_blk_dev(dev_desc, &info) != 0) { 106 printf("\n** Unable to use %s %d:%d for loading the env **\n", 107 CONFIG_ENV_FAT_INTERFACE, dev, part); 108 goto err_env_relocate; 109 } 110 111 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE); 112 if (err == -1) { 113 printf("\n** Unable to read \"%s\" from %s%d:%d **\n", 114 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 115 goto err_env_relocate; 116 } 117 118 env_import(buf, 1); 119 return; 120 121 err_env_relocate: 122 set_default_env(NULL); 123 } 124 #endif /* LOADENV */ 125 126 U_BOOT_ENV_LOCATION(fat) = { 127 .location = ENVL_FAT, 128 .get_char = env_get_char_spec, 129 #ifdef LOADENV 130 .load = env_relocate_spec, 131 #endif 132 #ifdef CMD_SAVEENV 133 .save = env_save_ptr(saveenv), 134 #endif 135 .init = env_init, 136 }; 137