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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