1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (c) Copyright 2011 by Tigris Elektronik GmbH
4 *
5 * Author:
6 * Maximilian Schwerin <mvs@tigris.de>
7 */
8
9 #include <common.h>
10
11 #include <command.h>
12 #include <environment.h>
13 #include <linux/stddef.h>
14 #include <malloc.h>
15 #include <memalign.h>
16 #include <search.h>
17 #include <errno.h>
18 #include <fat.h>
19 #include <mmc.h>
20
21 #ifdef CONFIG_SPL_BUILD
22 /* TODO(sjg@chromium.org): Figure out why this is needed */
23 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
24 # define LOADENV
25 # endif
26 #else
27 # define LOADENV
28 # if defined(CONFIG_CMD_SAVEENV)
29 # define CMD_SAVEENV
30 # endif
31 #endif
32
33 #ifdef CMD_SAVEENV
env_fat_save(void)34 static int env_fat_save(void)
35 {
36 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
37 struct blk_desc *dev_desc = NULL;
38 disk_partition_t info;
39 int dev, part;
40 int err;
41 loff_t size;
42
43 err = env_export(&env_new);
44 if (err)
45 return err;
46
47 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
48 CONFIG_ENV_FAT_DEVICE_AND_PART,
49 &dev_desc, &info, 1);
50 if (part < 0)
51 return 1;
52
53 dev = dev_desc->devnum;
54 if (fat_set_blk_dev(dev_desc, &info) != 0) {
55 /*
56 * This printf is embedded in the messages from env_save that
57 * will calling it. The missing \n is intentional.
58 */
59 printf("Unable to use %s %d:%d... ",
60 CONFIG_ENV_FAT_INTERFACE, dev, part);
61 return 1;
62 }
63
64 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
65 &size);
66 if (err == -1) {
67 /*
68 * This printf is embedded in the messages from env_save that
69 * will calling it. The missing \n is intentional.
70 */
71 printf("Unable to write \"%s\" from %s%d:%d... ",
72 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
73 return 1;
74 }
75
76 return 0;
77 }
78 #endif /* CMD_SAVEENV */
79
80 #ifdef LOADENV
env_fat_load(void)81 static int env_fat_load(void)
82 {
83 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
84 struct blk_desc *dev_desc = NULL;
85 disk_partition_t info;
86 int dev, part;
87 int err;
88
89 #ifdef CONFIG_MMC
90 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
91 mmc_initialize(NULL);
92 #endif
93
94 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
95 CONFIG_ENV_FAT_DEVICE_AND_PART,
96 &dev_desc, &info, 1);
97 if (part < 0)
98 goto err_env_relocate;
99
100 dev = dev_desc->devnum;
101 if (fat_set_blk_dev(dev_desc, &info) != 0) {
102 /*
103 * This printf is embedded in the messages from env_save that
104 * will calling it. The missing \n is intentional.
105 */
106 printf("Unable to use %s %d:%d... ",
107 CONFIG_ENV_FAT_INTERFACE, dev, part);
108 goto err_env_relocate;
109 }
110
111 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
112 if (err == -1) {
113 /*
114 * This printf is embedded in the messages from env_save that
115 * will calling it. The missing \n is intentional.
116 */
117 printf("Unable to read \"%s\" from %s%d:%d... ",
118 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
119 goto err_env_relocate;
120 }
121
122 return env_import(buf, 1);
123
124 err_env_relocate:
125 set_default_env(NULL);
126
127 return -EIO;
128 }
129 #endif /* LOADENV */
130
131 U_BOOT_ENV_LOCATION(fat) = {
132 .location = ENVL_FAT,
133 ENV_NAME("FAT")
134 #ifdef LOADENV
135 .load = env_fat_load,
136 #endif
137 #ifdef CMD_SAVEENV
138 .save = env_save_ptr(env_fat_save),
139 #endif
140 };
141