1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (c) Copyright 2016 by VRT Technology
4 *
5 * Author:
6 * Stuart Longland <stuartl@vrt.com.au>
7 *
8 * Based on FAT environment driver
9 * (c) Copyright 2011 by Tigris Elektronik GmbH
10 *
11 * Author:
12 * Maximilian Schwerin <mvs@tigris.de>
13 *
14 * and EXT4 filesystem implementation
15 * (C) Copyright 2011 - 2012 Samsung Electronics
16 * EXT4 filesystem implementation in Uboot by
17 * Uma Shankar <uma.shankar@samsung.com>
18 * Manjunatha C Achar <a.manjunatha@samsung.com>
19 */
20
21 #include <common.h>
22 #include <part.h>
23
24 #include <command.h>
25 #include <env.h>
26 #include <env_internal.h>
27 #include <linux/stddef.h>
28 #include <malloc.h>
29 #include <memalign.h>
30 #include <search.h>
31 #include <errno.h>
32 #include <ext4fs.h>
33 #include <mmc.h>
34 #include <asm/global_data.h>
35
36 DECLARE_GLOBAL_DATA_PTR;
37
env_ext4_get_intf(void)38 __weak const char *env_ext4_get_intf(void)
39 {
40 return (const char *)CONFIG_ENV_EXT4_INTERFACE;
41 }
42
env_ext4_get_dev_part(void)43 __weak const char *env_ext4_get_dev_part(void)
44 {
45 #ifdef CONFIG_MMC
46 static char *part_str;
47
48 if (!part_str) {
49 part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
50 if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
51 part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
52 part_str[0] += mmc_get_env_dev();
53 }
54 }
55
56 return part_str;
57 #else
58 return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
59 #endif
60 }
61
env_ext4_save_buffer(env_t * env_new)62 static int env_ext4_save_buffer(env_t *env_new)
63 {
64 struct blk_desc *dev_desc = NULL;
65 struct disk_partition info;
66 int dev, part;
67 int err;
68 const char *ifname = env_ext4_get_intf();
69 const char *dev_and_part = env_ext4_get_dev_part();
70
71 part = blk_get_device_part_str(ifname, dev_and_part,
72 &dev_desc, &info, 1);
73 if (part < 0)
74 return 1;
75
76 dev = dev_desc->devnum;
77 ext4fs_set_blk_dev(dev_desc, &info);
78
79 if (!ext4fs_mount(info.size)) {
80 printf("\n** Unable to use %s %s for saveenv **\n",
81 ifname, dev_and_part);
82 return 1;
83 }
84
85 err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
86 sizeof(env_t), FILETYPE_REG);
87 ext4fs_close();
88
89 if (err == -1) {
90 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
91 CONFIG_ENV_EXT4_FILE, ifname, dev, part);
92 return 1;
93 }
94
95 return 0;
96 }
97
env_ext4_save(void)98 static int env_ext4_save(void)
99 {
100 env_t env_new;
101 int err;
102
103 err = env_export(&env_new);
104 if (err)
105 return err;
106
107 err = env_ext4_save_buffer(&env_new);
108 if (err)
109 return err;
110
111 gd->env_valid = ENV_VALID;
112 puts("done\n");
113
114 return 0;
115 }
116
env_ext4_erase(void)117 static int env_ext4_erase(void)
118 {
119 env_t env_new;
120 int err;
121
122 memset(&env_new, 0, sizeof(env_t));
123
124 err = env_ext4_save_buffer(&env_new);
125 if (err)
126 return err;
127
128 gd->env_valid = ENV_INVALID;
129 puts("done\n");
130
131 return 0;
132 }
133
env_ext4_load(void)134 static int env_ext4_load(void)
135 {
136 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
137 struct blk_desc *dev_desc = NULL;
138 struct disk_partition info;
139 int dev, part;
140 int err;
141 loff_t off;
142 const char *ifname = env_ext4_get_intf();
143 const char *dev_and_part = env_ext4_get_dev_part();
144
145 #ifdef CONFIG_MMC
146 if (!strcmp(ifname, "mmc"))
147 mmc_initialize(NULL);
148 #endif
149
150 part = blk_get_device_part_str(ifname, dev_and_part,
151 &dev_desc, &info, 1);
152 if (part < 0)
153 goto err_env_relocate;
154
155 dev = dev_desc->devnum;
156 ext4fs_set_blk_dev(dev_desc, &info);
157
158 if (!ext4fs_mount(info.size)) {
159 printf("\n** Unable to use %s %s for loading the env **\n",
160 ifname, dev_and_part);
161 goto err_env_relocate;
162 }
163
164 err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
165 &off);
166 ext4fs_close();
167
168 if (err == -1) {
169 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
170 CONFIG_ENV_EXT4_FILE, ifname, dev, part);
171 goto err_env_relocate;
172 }
173
174 err = env_import(buf, 1, H_EXTERNAL);
175 if (!err)
176 gd->env_valid = ENV_VALID;
177
178 return err;
179
180 err_env_relocate:
181 env_set_default(NULL, 0);
182
183 return -EIO;
184 }
185
186 U_BOOT_ENV_LOCATION(ext4) = {
187 .location = ENVL_EXT4,
188 ENV_NAME("EXT4")
189 .load = env_ext4_load,
190 .save = ENV_SAVE_PTR(env_ext4_save),
191 .erase = CONFIG_IS_ENABLED(CMD_ERASEENV) ? env_ext4_erase :
192 NULL,
193 };
194