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 #include <command.h>
11 #include <env.h>
12 #include <env_internal.h>
13 #include <part.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 #include <asm/cache.h>
21 #include <linux/stddef.h>
22
23 #ifdef CONFIG_SPL_BUILD
24 /* TODO(sjg@chromium.org): Figure out why this is needed */
25 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
26 # define LOADENV
27 # endif
28 #else
29 # define LOADENV
30 #endif
31
env_fat_device_and_part(void)32 static char *env_fat_device_and_part(void)
33 {
34 #ifdef CONFIG_MMC
35 static char *part_str;
36
37 if (!part_str) {
38 part_str = CONFIG_ENV_FAT_DEVICE_AND_PART;
39 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc") && part_str[0] == ':') {
40 part_str = "0" CONFIG_ENV_FAT_DEVICE_AND_PART;
41 part_str[0] += mmc_get_env_dev();
42 }
43 }
44
45 return part_str;
46 #else
47 return CONFIG_ENV_FAT_DEVICE_AND_PART;
48 #endif
49 }
50
env_fat_save(void)51 static int env_fat_save(void)
52 {
53 env_t __aligned(ARCH_DMA_MINALIGN) env_new;
54 struct blk_desc *dev_desc = NULL;
55 struct disk_partition info;
56 int dev, part;
57 int err;
58 loff_t size;
59
60 err = env_export(&env_new);
61 if (err)
62 return err;
63
64 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
65 env_fat_device_and_part(),
66 &dev_desc, &info, 1);
67 if (part < 0)
68 return 1;
69
70 dev = dev_desc->devnum;
71 if (fat_set_blk_dev(dev_desc, &info) != 0) {
72 /*
73 * This printf is embedded in the messages from env_save that
74 * will calling it. The missing \n is intentional.
75 */
76 printf("Unable to use %s %d:%d... ",
77 CONFIG_ENV_FAT_INTERFACE, dev, part);
78 return 1;
79 }
80
81 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
82 &size);
83 if (err == -1) {
84 /*
85 * This printf is embedded in the messages from env_save that
86 * will calling it. The missing \n is intentional.
87 */
88 printf("Unable to write \"%s\" from %s%d:%d... ",
89 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
90 return 1;
91 }
92
93 return 0;
94 }
95
96 #ifdef LOADENV
env_fat_load(void)97 static int env_fat_load(void)
98 {
99 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
100 struct blk_desc *dev_desc = NULL;
101 struct disk_partition info;
102 int dev, part;
103 int err;
104
105 #ifdef CONFIG_MMC
106 if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
107 mmc_initialize(NULL);
108 #endif
109
110 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
111 env_fat_device_and_part(),
112 &dev_desc, &info, 1);
113 if (part < 0)
114 goto err_env_relocate;
115
116 dev = dev_desc->devnum;
117 if (fat_set_blk_dev(dev_desc, &info) != 0) {
118 /*
119 * This printf is embedded in the messages from env_save that
120 * will calling it. The missing \n is intentional.
121 */
122 printf("Unable to use %s %d:%d... ",
123 CONFIG_ENV_FAT_INTERFACE, dev, part);
124 goto err_env_relocate;
125 }
126
127 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
128 if (err == -1) {
129 /*
130 * This printf is embedded in the messages from env_save that
131 * will calling it. The missing \n is intentional.
132 */
133 printf("Unable to read \"%s\" from %s%d:%d... ",
134 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
135 goto err_env_relocate;
136 }
137
138 return env_import(buf, 1, H_EXTERNAL);
139
140 err_env_relocate:
141 env_set_default(NULL, 0);
142
143 return -EIO;
144 }
145 #endif /* LOADENV */
146
147 U_BOOT_ENV_LOCATION(fat) = {
148 .location = ENVL_FAT,
149 ENV_NAME("FAT")
150 #ifdef LOADENV
151 .load = env_fat_load,
152 #endif
153 .save = ENV_SAVE_PTR(env_fat_save),
154 };
155