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"Das U-Boot" Source Tree
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 <part.h>
22
23#include <command.h>
24#include <env.h>
25#include <env_internal.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#include <scsi.h>
34#include <virtio.h>
35#include <asm/global_data.h>
36
37DECLARE_GLOBAL_DATA_PTR;
38
39__weak const char *env_ext4_get_intf(void)
40{
41 return (const char *)CONFIG_ENV_EXT4_INTERFACE;
42}
43
44__weak const char *env_ext4_get_dev_part(void)
45{
46#ifdef CONFIG_MMC
47 static char *part_str;
48
49 if (!part_str) {
50 part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
51 if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
52 part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
53 part_str[0] += mmc_get_env_dev();
54 }
55 }
56
57 return part_str;
58#else
59 return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
60#endif
61}
62
63static int env_ext4_save_buffer(env_t *env_new)
64{
65 struct blk_desc *dev_desc = NULL;
66 struct disk_partition info;
67 int dev, part;
68 int err;
69 const char *ifname = env_ext4_get_intf();
70 const char *dev_and_part = env_ext4_get_dev_part();
71
72 part = blk_get_device_part_str(ifname, dev_and_part,
73 &dev_desc, &info, 1);
74 if (part < 0)
75 return 1;
76
77 dev = dev_desc->devnum;
78 ext4fs_set_blk_dev(dev_desc, &info);
79
80 if (!ext4fs_mount()) {
81 printf("\n** Unable to use %s %s for saveenv **\n",
82 ifname, dev_and_part);
83 return 1;
84 }
85
86 err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
87 sizeof(env_t), FILETYPE_REG);
88 ext4fs_close();
89
90 if (err == -1) {
91 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
92 CONFIG_ENV_EXT4_FILE, ifname, dev, part);
93 return 1;
94 }
95
96 return 0;
97}
98
99static int env_ext4_save(void)
100{
101 env_t env_new;
102 int err;
103
104 err = env_export(&env_new);
105 if (err)
106 return err;
107
108 err = env_ext4_save_buffer(&env_new);
109 if (err)
110 return err;
111
112 gd->env_valid = ENV_VALID;
113 puts("done\n");
114
115 return 0;
116}
117
118static int env_ext4_erase(void)
119{
120 env_t env_new;
121 int err;
122
123 memset(&env_new, 0, sizeof(env_t));
124
125 err = env_ext4_save_buffer(&env_new);
126 if (err)
127 return err;
128
129 gd->env_valid = ENV_INVALID;
130 puts("done\n");
131
132 return 0;
133}
134
135static int env_ext4_load(void)
136{
137 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
138 struct blk_desc *dev_desc = NULL;
139 struct disk_partition info;
140 int dev, part;
141 int err;
142 loff_t off;
143 const char *ifname = env_ext4_get_intf();
144 const char *dev_and_part = env_ext4_get_dev_part();
145
146#ifdef CONFIG_MMC
147 if (!strcmp(ifname, "mmc"))
148 mmc_initialize(NULL);
149#endif
150#if defined(CONFIG_AHCI) || defined(CONFIG_SCSI)
151 if (!strcmp(ifname, "scsi"))
152 scsi_scan(true);
153#endif
154#if defined(CONFIG_VIRTIO)
155 if (!strcmp(ifname, "virtio"))
156 virtio_init();
157#endif
158
159 part = blk_get_device_part_str(ifname, dev_and_part,
160 &dev_desc, &info, 1);
161 if (part < 0)
162 goto err_env_relocate;
163
164 dev = dev_desc->devnum;
165 ext4fs_set_blk_dev(dev_desc, &info);
166
167 if (!ext4fs_mount()) {
168 printf("\n** Unable to use %s %s for loading the env **\n",
169 ifname, dev_and_part);
170 goto err_env_relocate;
171 }
172
173 err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
174 &off);
175 ext4fs_close();
176
177 if (err == -1) {
178 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
179 CONFIG_ENV_EXT4_FILE, ifname, dev, part);
180 goto err_env_relocate;
181 }
182
183 err = env_import(buf, 1, H_EXTERNAL);
184 if (!err)
185 gd->env_valid = ENV_VALID;
186
187 return err;
188
189err_env_relocate:
190 env_set_default(NULL, 0);
191
192 return -EIO;
193}
194
195U_BOOT_ENV_LOCATION(ext4) = {
196 .location = ENVL_EXT4,
197 ENV_NAME("EXT4")
198 .load = env_ext4_load,
199 .save = ENV_SAVE_PTR(env_ext4_save),
200 .erase = ENV_ERASE_PTR(env_ext4_erase),
201};