1 // SPDX-License-Identifier: GPL-2.0+
3 * (c) Copyright 2011 by Tigris Elektronik GmbH
6 * Maximilian Schwerin <mvs@tigris.de>
12 #include <env_internal.h>
20 #include <asm/cache.h>
21 #include <asm/global_data.h>
22 #include <linux/stddef.h>
24 #ifdef CONFIG_SPL_BUILD
25 /* TODO(sjg@chromium.org): Figure out why this is needed */
26 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
33 DECLARE_GLOBAL_DATA_PTR;
35 __weak const char *env_fat_get_intf(void)
37 return (const char *)CONFIG_ENV_FAT_INTERFACE;
40 __weak char *env_fat_get_dev_part(void)
43 static char *part_str;
46 part_str = CONFIG_ENV_FAT_DEVICE_AND_PART;
47 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc") && part_str[0] == ':') {
48 part_str = "0" CONFIG_ENV_FAT_DEVICE_AND_PART;
49 part_str[0] += mmc_get_env_dev();
55 return CONFIG_ENV_FAT_DEVICE_AND_PART;
59 static int env_fat_save(void)
61 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
62 struct blk_desc *dev_desc = NULL;
63 struct disk_partition info;
64 const char *file = CONFIG_ENV_FAT_FILE;
68 const char *ifname = env_fat_get_intf();
69 const char *dev_and_part = env_fat_get_dev_part();
71 err = env_export(&env_new);
75 part = blk_get_device_part_str(ifname, dev_and_part,
80 dev = dev_desc->devnum;
81 if (fat_set_blk_dev(dev_desc, &info) != 0) {
83 * This printf is embedded in the messages from env_save that
84 * will calling it. The missing \n is intentional.
86 printf("Unable to use %s %d:%d...\n", ifname, dev, part);
90 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
91 if (gd->env_valid == ENV_VALID)
92 file = CONFIG_ENV_FAT_FILE_REDUND;
95 err = file_fat_write(file, (void *)&env_new, 0, sizeof(env_t), &size);
98 * This printf is embedded in the messages from env_save that
99 * will calling it. The missing \n is intentional.
101 printf("Unable to write \"%s\" from %s%d:%d...\n", file, ifname, dev, part);
105 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
106 gd->env_valid = (gd->env_valid == ENV_REDUND) ? ENV_VALID : ENV_REDUND;
113 static int env_fat_load(void)
115 ALLOC_CACHE_ALIGN_BUFFER(char, buf1, CONFIG_ENV_SIZE);
116 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
117 ALLOC_CACHE_ALIGN_BUFFER(char, buf2, CONFIG_ENV_SIZE);
120 struct blk_desc *dev_desc = NULL;
121 struct disk_partition info;
124 const char *ifname = env_fat_get_intf();
125 const char *dev_and_part = env_fat_get_dev_part();
128 if (!strcmp(ifname, "mmc"))
129 mmc_initialize(NULL);
132 part = blk_get_device_part_str(ifname, dev_and_part,
133 &dev_desc, &info, 1);
135 goto err_env_relocate;
137 dev = dev_desc->devnum;
138 if (fat_set_blk_dev(dev_desc, &info) != 0) {
140 * This printf is embedded in the messages from env_save that
141 * will calling it. The missing \n is intentional.
143 printf("Unable to use %s %d:%d...\n", ifname, dev, part);
144 goto err_env_relocate;
147 err1 = file_fat_read(CONFIG_ENV_FAT_FILE, buf1, CONFIG_ENV_SIZE);
148 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
149 err2 = file_fat_read(CONFIG_ENV_FAT_FILE_REDUND, buf2, CONFIG_ENV_SIZE);
151 err1 = (err1 >= 0) ? 0 : -1;
152 err2 = (err2 >= 0) ? 0 : -1;
153 return env_import_redund(buf1, err1, buf2, err2, H_EXTERNAL);
157 * This printf is embedded in the messages from env_save that
158 * will calling it. The missing \n is intentional.
160 printf("Unable to read \"%s\" from %s%d:%d... \n",
161 CONFIG_ENV_FAT_FILE, ifname, dev, part);
162 goto err_env_relocate;
165 return env_import(buf1, 1, H_EXTERNAL);
169 env_set_default(NULL, 0);
175 U_BOOT_ENV_LOCATION(fat) = {
176 .location = ENVL_FAT,
179 .load = env_fat_load,
181 .save = ENV_SAVE_PTR(env_fat_save),