xref: /openbmc/u-boot/env/ext4.c (revision feaa7856f50ec5bbf843d533ee223aedd845452c)
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  
23  #include <command.h>
24  #include <environment.h>
25  #include <linux/stddef.h>
26  #include <malloc.h>
27  #include <memalign.h>
28  #include <search.h>
29  #include <errno.h>
30  #include <ext4fs.h>
31  #include <mmc.h>
32  
33  #ifdef CONFIG_CMD_SAVEENV
34  static int env_ext4_save(void)
35  {
36  	env_t	env_new;
37  	struct blk_desc *dev_desc = NULL;
38  	disk_partition_t info;
39  	int dev, part;
40  	int err;
41  
42  	err = env_export(&env_new);
43  	if (err)
44  		return err;
45  
46  	part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
47  				       CONFIG_ENV_EXT4_DEVICE_AND_PART,
48  				       &dev_desc, &info, 1);
49  	if (part < 0)
50  		return 1;
51  
52  	dev = dev_desc->devnum;
53  	ext4fs_set_blk_dev(dev_desc, &info);
54  
55  	if (!ext4fs_mount(info.size)) {
56  		printf("\n** Unable to use %s %s for saveenv **\n",
57  		       CONFIG_ENV_EXT4_INTERFACE,
58  		       CONFIG_ENV_EXT4_DEVICE_AND_PART);
59  		return 1;
60  	}
61  
62  	err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
63  			   sizeof(env_t));
64  	ext4fs_close();
65  
66  	if (err == -1) {
67  		printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
68  			CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
69  			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  #ifdef CONFIG_MMC
88  	if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
89  		mmc_initialize(NULL);
90  #endif
91  
92  	part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
93  				       CONFIG_ENV_EXT4_DEVICE_AND_PART,
94  				       &dev_desc, &info, 1);
95  	if (part < 0)
96  		goto err_env_relocate;
97  
98  	dev = dev_desc->devnum;
99  	ext4fs_set_blk_dev(dev_desc, &info);
100  
101  	if (!ext4fs_mount(info.size)) {
102  		printf("\n** Unable to use %s %s for loading the env **\n",
103  		       CONFIG_ENV_EXT4_INTERFACE,
104  		       CONFIG_ENV_EXT4_DEVICE_AND_PART);
105  		goto err_env_relocate;
106  	}
107  
108  	err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
109  			     &off);
110  	ext4fs_close();
111  
112  	if (err == -1) {
113  		printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
114  			CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
115  			part);
116  		goto err_env_relocate;
117  	}
118  
119  	return env_import(buf, 1);
120  
121  err_env_relocate:
122  	set_default_env(NULL, 0);
123  
124  	return -EIO;
125  }
126  
127  U_BOOT_ENV_LOCATION(ext4) = {
128  	.location	= ENVL_EXT4,
129  	ENV_NAME("EXT4")
130  	.load		= env_ext4_load,
131  	.save		= env_save_ptr(env_ext4_save),
132  };
133