xref: /openbmc/u-boot/env/ext4.c (revision eb45787b)
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(EXT4_ENV_INTERFACE,
50 					EXT4_ENV_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 		       EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
61 		return 1;
62 	}
63 
64 	err = ext4fs_write(EXT4_ENV_FILE, (void *)&env_new, sizeof(env_t));
65 	ext4fs_close();
66 
67 	if (err == -1) {
68 		printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
69 			EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
70 		return 1;
71 	}
72 
73 	puts("done\n");
74 	return 0;
75 }
76 #endif /* CONFIG_CMD_SAVEENV */
77 
78 static int env_ext4_load(void)
79 {
80 	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
81 	struct blk_desc *dev_desc = NULL;
82 	disk_partition_t info;
83 	int dev, part;
84 	int err;
85 	loff_t off;
86 
87 	part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
88 					EXT4_ENV_DEVICE_AND_PART,
89 					&dev_desc, &info, 1);
90 	if (part < 0)
91 		goto err_env_relocate;
92 
93 	dev = dev_desc->devnum;
94 	ext4fs_set_blk_dev(dev_desc, &info);
95 
96 	if (!ext4fs_mount(info.size)) {
97 		printf("\n** Unable to use %s %s for loading the env **\n",
98 		       EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
99 		goto err_env_relocate;
100 	}
101 
102 	err = ext4_read_file(EXT4_ENV_FILE, buf, 0, CONFIG_ENV_SIZE, &off);
103 	ext4fs_close();
104 
105 	if (err == -1) {
106 		printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
107 			EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
108 		goto err_env_relocate;
109 	}
110 
111 	env_import(buf, 1);
112 	return 0;
113 
114 err_env_relocate:
115 	set_default_env(NULL);
116 
117 	return -EIO;
118 }
119 
120 U_BOOT_ENV_LOCATION(ext4) = {
121 	.location	= ENVL_EXT4,
122 	ENV_NAME("EXT4")
123 	.load		= env_ext4_load,
124 	.save		= env_save_ptr(env_ext4_save),
125 };
126