arm: mvebu: Introduce mvebu-u-boot.dtsi for 32-bit Armada SoCs
[platform/kernel/u-boot.git] / env / ext4.c
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 <scsi.h>
35 #include <asm/global_data.h>
36
37 DECLARE_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
63 static 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(info.size)) {
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
99 static 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
118 static 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
135 static 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
155         part = blk_get_device_part_str(ifname, dev_and_part,
156                                        &dev_desc, &info, 1);
157         if (part < 0)
158                 goto err_env_relocate;
159
160         dev = dev_desc->devnum;
161         ext4fs_set_blk_dev(dev_desc, &info);
162
163         if (!ext4fs_mount(info.size)) {
164                 printf("\n** Unable to use %s %s for loading the env **\n",
165                        ifname, dev_and_part);
166                 goto err_env_relocate;
167         }
168
169         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
170                              &off);
171         ext4fs_close();
172
173         if (err == -1) {
174                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
175                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
176                 goto err_env_relocate;
177         }
178
179         err = env_import(buf, 1, H_EXTERNAL);
180         if (!err)
181                 gd->env_valid = ENV_VALID;
182
183         return err;
184
185 err_env_relocate:
186         env_set_default(NULL, 0);
187
188         return -EIO;
189 }
190
191 U_BOOT_ENV_LOCATION(ext4) = {
192         .location       = ENVL_EXT4,
193         ENV_NAME("EXT4")
194         .load           = env_ext4_load,
195         .save           = ENV_SAVE_PTR(env_ext4_save),
196         .erase          = ENV_ERASE_PTR(env_ext4_erase),
197 };