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1 /*
2  * (c) Copyright 2016 by VRT Technology
3  *
4  * Author:
5  *  Stuart Longland <stuartl@vrt.com.au>
6  *
7  * Based on FAT environment driver
8  * (c) Copyright 2011 by Tigris Elektronik GmbH
9  *
10  * Author:
11  *  Maximilian Schwerin <mvs@tigris.de>
12  *
13  * and EXT4 filesystem implementation
14  * (C) Copyright 2011 - 2012 Samsung Electronics
15  * EXT4 filesystem implementation in Uboot by
16  * Uma Shankar <uma.shankar@samsung.com>
17  * Manjunatha C Achar <a.manjunatha@samsung.com>
18  *
19  * SPDX-License-Identifier:     GPL-2.0+
20  */
21
22 #include <common.h>
23
24 #include <command.h>
25 #include <environment.h>
26 #include <linux/stddef.h>
27 #include <malloc.h>
28 #include <memalign.h>
29 #include <search.h>
30 #include <errno.h>
31 #include <ext4fs.h>
32 #include <mmc.h>
33
34 DECLARE_GLOBAL_DATA_PTR;
35
36 #ifdef CONFIG_CMD_SAVEENV
37 static int env_ext4_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
45         err = env_export(&env_new);
46         if (err)
47                 return err;
48
49         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
50                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
51                                        &dev_desc, &info, 1);
52         if (part < 0)
53                 return 1;
54
55         dev = dev_desc->devnum;
56         ext4fs_set_blk_dev(dev_desc, &info);
57
58         if (!ext4fs_mount(info.size)) {
59                 printf("\n** Unable to use %s %s for saveenv **\n",
60                        CONFIG_ENV_EXT4_INTERFACE,
61                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
62                 return 1;
63         }
64
65         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
66                            sizeof(env_t));
67         ext4fs_close();
68
69         if (err == -1) {
70                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
71                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
72                         part);
73                 return 1;
74         }
75
76         puts("done\n");
77         return 0;
78 }
79 #endif /* CONFIG_CMD_SAVEENV */
80
81 static int env_ext4_load(void)
82 {
83         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
84         struct blk_desc *dev_desc = NULL;
85         disk_partition_t info;
86         int dev, part;
87         int err;
88         loff_t off;
89
90         if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
91                 mmc_initialize(NULL);
92
93         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
94                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
95                                        &dev_desc, &info, 1);
96         if (part < 0)
97                 goto err_env_relocate;
98
99         dev = dev_desc->devnum;
100         ext4fs_set_blk_dev(dev_desc, &info);
101
102         if (!ext4fs_mount(info.size)) {
103                 printf("\n** Unable to use %s %s for loading the env **\n",
104                        CONFIG_ENV_EXT4_INTERFACE,
105                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
106                 goto err_env_relocate;
107         }
108
109         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
110                              &off);
111         ext4fs_close();
112
113         if (err == -1) {
114                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
115                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
116                         part);
117                 goto err_env_relocate;
118         }
119
120         return env_import(buf, 1);
121
122 err_env_relocate:
123         set_default_env(NULL);
124
125         return -EIO;
126 }
127
128 U_BOOT_ENV_LOCATION(ext4) = {
129         .location       = ENVL_EXT4,
130         ENV_NAME("EXT4")
131         .load           = env_ext4_load,
132         .save           = env_save_ptr(env_ext4_save),
133 };