1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (c) Copyright 2011 by Tigris Elektronik GmbH
4 *
5 * Author:
6 * Maximilian Schwerin <mvs@tigris.de>
7 */
8
9 #include <common.h>
10 #include <command.h>
11 #include <env.h>
12 #include <env_internal.h>
13 #include <part.h>
14 #include <malloc.h>
15 #include <memalign.h>
16 #include <search.h>
17 #include <errno.h>
18 #include <fat.h>
19 #include <mmc.h>
20 #include <asm/cache.h>
21 #include <asm/global_data.h>
22 #include <linux/stddef.h>
23
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)
27 # define LOADENV
28 # endif
29 #else
30 # define LOADENV
31 #endif
32
33 DECLARE_GLOBAL_DATA_PTR;
34
env_fat_device_and_part(void)35 static char *env_fat_device_and_part(void)
36 {
37 #ifdef CONFIG_MMC
38 static char *part_str;
39
40 if (!part_str) {
41 part_str = CONFIG_ENV_FAT_DEVICE_AND_PART;
42 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc") && part_str[0] == ':') {
43 part_str = "0" CONFIG_ENV_FAT_DEVICE_AND_PART;
44 part_str[0] += mmc_get_env_dev();
45 }
46 }
47
48 return part_str;
49 #else
50 return CONFIG_ENV_FAT_DEVICE_AND_PART;
51 #endif
52 }
53
env_fat_save(void)54 static int env_fat_save(void)
55 {
56 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
57 struct blk_desc *dev_desc = NULL;
58 struct disk_partition info;
59 const char *file = CONFIG_ENV_FAT_FILE;
60 int dev, part;
61 int err;
62 loff_t size;
63
64 err = env_export(&env_new);
65 if (err)
66 return err;
67
68 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
69 env_fat_device_and_part(),
70 &dev_desc, &info, 1);
71 if (part < 0)
72 return 1;
73
74 dev = dev_desc->devnum;
75 if (fat_set_blk_dev(dev_desc, &info) != 0) {
76 /*
77 * This printf is embedded in the messages from env_save that
78 * will calling it. The missing \n is intentional.
79 */
80 printf("Unable to use %s %d:%d... ",
81 CONFIG_ENV_FAT_INTERFACE, dev, part);
82 return 1;
83 }
84
85 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
86 if (gd->env_valid == ENV_VALID)
87 file = CONFIG_ENV_FAT_FILE_REDUND;
88 #endif
89
90 err = file_fat_write(file, (void *)&env_new, 0, sizeof(env_t), &size);
91 if (err == -1) {
92 /*
93 * This printf is embedded in the messages from env_save that
94 * will calling it. The missing \n is intentional.
95 */
96 printf("Unable to write \"%s\" from %s%d:%d... ",
97 file, CONFIG_ENV_FAT_INTERFACE, dev, part);
98 return 1;
99 }
100
101 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
102 gd->env_valid = (gd->env_valid == ENV_REDUND) ? ENV_VALID : ENV_REDUND;
103 #endif
104
105 return 0;
106 }
107
108 #ifdef LOADENV
env_fat_load(void)109 static int env_fat_load(void)
110 {
111 ALLOC_CACHE_ALIGN_BUFFER(char, buf1, CONFIG_ENV_SIZE);
112 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
113 ALLOC_CACHE_ALIGN_BUFFER(char, buf2, CONFIG_ENV_SIZE);
114 int err2;
115 #endif
116 struct blk_desc *dev_desc = NULL;
117 struct disk_partition info;
118 int dev, part;
119 int err1;
120
121 #ifdef CONFIG_MMC
122 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
123 mmc_initialize(NULL);
124 #endif
125
126 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
127 env_fat_device_and_part(),
128 &dev_desc, &info, 1);
129 if (part < 0)
130 goto err_env_relocate;
131
132 dev = dev_desc->devnum;
133 if (fat_set_blk_dev(dev_desc, &info) != 0) {
134 /*
135 * This printf is embedded in the messages from env_save that
136 * will calling it. The missing \n is intentional.
137 */
138 printf("Unable to use %s %d:%d... ",
139 CONFIG_ENV_FAT_INTERFACE, dev, part);
140 goto err_env_relocate;
141 }
142
143 err1 = file_fat_read(CONFIG_ENV_FAT_FILE, buf1, CONFIG_ENV_SIZE);
144 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
145 err2 = file_fat_read(CONFIG_ENV_FAT_FILE_REDUND, buf2, CONFIG_ENV_SIZE);
146
147 err1 = (err1 >= 0) ? 0 : -1;
148 err2 = (err2 >= 0) ? 0 : -1;
149 return env_import_redund(buf1, err1, buf2, err2, H_EXTERNAL);
150 #else
151 if (err1 < 0) {
152 /*
153 * This printf is embedded in the messages from env_save that
154 * will calling it. The missing \n is intentional.
155 */
156 printf("Unable to read \"%s\" from %s%d:%d... ",
157 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
158 goto err_env_relocate;
159 }
160
161 return env_import(buf1, 1, H_EXTERNAL);
162 #endif
163
164 err_env_relocate:
165 env_set_default(NULL, 0);
166
167 return -EIO;
168 }
169 #endif /* LOADENV */
170
171 U_BOOT_ENV_LOCATION(fat) = {
172 .location = ENVL_FAT,
173 ENV_NAME("FAT")
174 #ifdef LOADENV
175 .load = env_fat_load,
176 #endif
177 .save = ENV_SAVE_PTR(env_fat_save),
178 };
179