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 <env.h>
13 #include <env_internal.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 #ifdef CMD_SAVEENV
env_fat_save(void)35 static int env_fat_save(void)
36 {
37 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
38 struct blk_desc *dev_desc = NULL;
39 disk_partition_t info;
40 int dev, part;
41 int err;
42 loff_t size;
43
44 err = env_export(&env_new);
45 if (err)
46 return err;
47
48 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
49 CONFIG_ENV_FAT_DEVICE_AND_PART,
50 &dev_desc, &info, 1);
51 if (part < 0)
52 return 1;
53
54 dev = dev_desc->devnum;
55 if (fat_set_blk_dev(dev_desc, &info) != 0) {
56 /*
57 * This printf is embedded in the messages from env_save that
58 * will calling it. The missing \n is intentional.
59 */
60 printf("Unable to use %s %d:%d... ",
61 CONFIG_ENV_FAT_INTERFACE, dev, part);
62 return 1;
63 }
64
65 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
66 &size);
67 if (err == -1) {
68 /*
69 * This printf is embedded in the messages from env_save that
70 * will calling it. The missing \n is intentional.
71 */
72 printf("Unable to write \"%s\" from %s%d:%d... ",
73 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
74 return 1;
75 }
76
77 return 0;
78 }
79 #endif /* CMD_SAVEENV */
80
81 #ifdef LOADENV
env_fat_load(void)82 static int env_fat_load(void)
83 {
84 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
85 struct blk_desc *dev_desc = NULL;
86 disk_partition_t info;
87 int dev, part;
88 int err;
89
90 #ifdef CONFIG_MMC
91 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
92 mmc_initialize(NULL);
93 #endif
94
95 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
96 CONFIG_ENV_FAT_DEVICE_AND_PART,
97 &dev_desc, &info, 1);
98 if (part < 0)
99 goto err_env_relocate;
100
101 dev = dev_desc->devnum;
102 if (fat_set_blk_dev(dev_desc, &info) != 0) {
103 /*
104 * This printf is embedded in the messages from env_save that
105 * will calling it. The missing \n is intentional.
106 */
107 printf("Unable to use %s %d:%d... ",
108 CONFIG_ENV_FAT_INTERFACE, dev, part);
109 goto err_env_relocate;
110 }
111
112 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
113 if (err == -1) {
114 /*
115 * This printf is embedded in the messages from env_save that
116 * will calling it. The missing \n is intentional.
117 */
118 printf("Unable to read \"%s\" from %s%d:%d... ",
119 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
120 goto err_env_relocate;
121 }
122
123 return env_import(buf, 1);
124
125 err_env_relocate:
126 env_set_default(NULL, 0);
127
128 return -EIO;
129 }
130 #endif /* LOADENV */
131
132 U_BOOT_ENV_LOCATION(fat) = {
133 .location = ENVL_FAT,
134 ENV_NAME("FAT")
135 #ifdef LOADENV
136 .load = env_fat_load,
137 #endif
138 #ifdef CMD_SAVEENV
139 .save = env_save_ptr(env_fat_save),
140 #endif
141 };
142