xref: /openbmc/u-boot/env/fat.c (revision 203e94f6c9ca03e260175ce240f5856507395585)
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 char *env_name_spec = "FAT";
23 
24 env_t *env_ptr;
25 
26 DECLARE_GLOBAL_DATA_PTR;
27 
28 int env_init(void)
29 {
30 	/* use default */
31 	gd->env_addr = (ulong)&default_environment[0];
32 	gd->env_valid = ENV_VALID;
33 
34 	return 0;
35 }
36 
37 #ifdef CONFIG_CMD_SAVEENV
38 int saveenv(void)
39 {
40 	env_t	env_new;
41 	struct blk_desc *dev_desc = NULL;
42 	disk_partition_t info;
43 	int dev, part;
44 	int err;
45 	loff_t size;
46 
47 	err = env_export(&env_new);
48 	if (err)
49 		return err;
50 
51 	part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
52 					CONFIG_ENV_FAT_DEVICE_AND_PART,
53 					&dev_desc, &info, 1);
54 	if (part < 0)
55 		return 1;
56 
57 	dev = dev_desc->devnum;
58 	if (fat_set_blk_dev(dev_desc, &info) != 0) {
59 		printf("\n** Unable to use %s %d:%d for saveenv **\n",
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 		printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
68 			CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
69 		return 1;
70 	}
71 
72 	puts("done\n");
73 	return 0;
74 }
75 #endif /* CONFIG_CMD_SAVEENV */
76 
77 void env_relocate_spec(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;
107 
108 err_env_relocate:
109 	set_default_env(NULL);
110 }
111