Merge tag 'signed-efi-next' of git://github.com/agraf/u-boot
[platform/kernel/u-boot.git] / env / fat.c
1 /*
2  * (c) Copyright 2011 by Tigris Elektronik GmbH
3  *
4  * Author:
5  *  Maximilian Schwerin <mvs@tigris.de>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11
12 #include <command.h>
13 #include <environment.h>
14 #include <linux/stddef.h>
15 #include <malloc.h>
16 #include <memalign.h>
17 #include <search.h>
18 #include <errno.h>
19 #include <fat.h>
20 #include <mmc.h>
21
22 #ifdef CONFIG_SPL_BUILD
23 /* TODO(sjg@chromium.org): Figure out why this is needed */
24 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
25 #  define LOADENV
26 # endif
27 #else
28 # define LOADENV
29 # if defined(CONFIG_CMD_SAVEENV)
30 #  define CMD_SAVEENV
31 # endif
32 #endif
33
34 DECLARE_GLOBAL_DATA_PTR;
35
36 #ifdef CMD_SAVEENV
37 static int env_fat_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         loff_t size;
45
46         err = env_export(&env_new);
47         if (err)
48                 return err;
49
50         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
51                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
52                                         &dev_desc, &info, 1);
53         if (part < 0)
54                 return 1;
55
56         dev = dev_desc->devnum;
57         if (fat_set_blk_dev(dev_desc, &info) != 0) {
58                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
59                        CONFIG_ENV_FAT_INTERFACE, dev, part);
60                 return 1;
61         }
62
63         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
64                              &size);
65         if (err == -1) {
66                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
67                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
68                 return 1;
69         }
70
71         puts("done\n");
72         return 0;
73 }
74 #endif /* CMD_SAVEENV */
75
76 #ifdef LOADENV
77 static int env_fat_load(void)
78 {
79         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
80         struct blk_desc *dev_desc = NULL;
81         disk_partition_t info;
82         int dev, part;
83         int err;
84
85         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
86                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
87                                         &dev_desc, &info, 1);
88         if (part < 0)
89                 goto err_env_relocate;
90
91         dev = dev_desc->devnum;
92         if (fat_set_blk_dev(dev_desc, &info) != 0) {
93                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
94                        CONFIG_ENV_FAT_INTERFACE, dev, part);
95                 goto err_env_relocate;
96         }
97
98         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
99         if (err == -1) {
100                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
101                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
102                 goto err_env_relocate;
103         }
104
105         env_import(buf, 1);
106         return 0;
107
108 err_env_relocate:
109         set_default_env(NULL);
110
111         return -EIO;
112 }
113 #endif /* LOADENV */
114
115 U_BOOT_ENV_LOCATION(fat) = {
116         .location       = ENVL_FAT,
117         ENV_NAME("FAT")
118 #ifdef LOADENV
119         .load           = env_fat_load,
120 #endif
121 #ifdef CMD_SAVEENV
122         .save           = env_save_ptr(env_fat_save),
123 #endif
124 };