summaryrefslogtreecommitdiffstats
path: root/env/fat.c
blob: 653a38fd937c8d998ce719b0a911de68599f29ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// SPDX-License-Identifier: GPL-2.0+
/*
 * (c) Copyright 2011 by Tigris Elektronik GmbH
 *
 * Author:
 *  Maximilian Schwerin <mvs@tigris.de>
 */

#include <common.h>
#include <command.h>
#include <env.h>
#include <env_internal.h>
#include <part.h>
#include <malloc.h>
#include <memalign.h>
#include <search.h>
#include <errno.h>
#include <fat.h>
#include <mmc.h>
#include <asm/cache.h>
#include <linux/stddef.h>

#ifdef CONFIG_SPL_BUILD
/* TODO(sjg@chromium.org): Figure out why this is needed */
# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
#  define LOADENV
# endif
#else
# define LOADENV
#endif

static char *env_fat_device_and_part(void)
{
#ifdef CONFIG_MMC
	static char *part_str;

	if (!part_str) {
		part_str = CONFIG_ENV_FAT_DEVICE_AND_PART;
		if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc") && part_str[0] == ':') {
			part_str = "0" CONFIG_ENV_FAT_DEVICE_AND_PART;
			part_str[0] += mmc_get_env_dev();
		}
	}

	return part_str;
#else
	return CONFIG_ENV_FAT_DEVICE_AND_PART;
#endif
}

static int env_fat_save(void)
{
	env_t __aligned(ARCH_DMA_MINALIGN) env_new;
	struct blk_desc *dev_desc = NULL;
	struct disk_partition info;
	int dev, part;
	int err;
	loff_t size;

	err = env_export(&env_new);
	if (err)
		return err;

	part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
					env_fat_device_and_part(),
					&dev_desc, &info, 1);
	if (part < 0)
		return 1;

	dev = dev_desc->devnum;
	if (fat_set_blk_dev(dev_desc, &info) != 0) {
		/*
		 * This printf is embedded in the messages from env_save that
		 * will calling it. The missing \n is intentional.
		 */
		printf("Unable to use %s %d:%d... ",
		       CONFIG_ENV_FAT_INTERFACE, dev, part);
		return 1;
	}

	err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
			     &size);
	if (err == -1) {
		/*
		 * This printf is embedded in the messages from env_save that
		 * will calling it. The missing \n is intentional.
		 */
		printf("Unable to write \"%s\" from %s%d:%d... ",
			CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
		return 1;
	}

	return 0;
}

#ifdef LOADENV
static int env_fat_load(void)
{
	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
	struct blk_desc *dev_desc = NULL;
	struct disk_partition info;
	int dev, part;
	int err;

#ifdef CONFIG_MMC
	if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
		mmc_initialize(NULL);
#endif

	part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
					env_fat_device_and_part(),
					&dev_desc, &info, 1);
	if (part < 0)
		goto err_env_relocate;

	dev = dev_desc->devnum;
	if (fat_set_blk_dev(dev_desc, &info) != 0) {
		/*
		 * This printf is embedded in the messages from env_save that
		 * will calling it. The missing \n is intentional.
		 */
		printf("Unable to use %s %d:%d... ",
		       CONFIG_ENV_FAT_INTERFACE, dev, part);
		goto err_env_relocate;
	}

	err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
	if (err == -1) {
		/*
		 * This printf is embedded in the messages from env_save that
		 * will calling it. The missing \n is intentional.
		 */
		printf("Unable to read \"%s\" from %s%d:%d... ",
			CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
		goto err_env_relocate;
	}

	return env_import(buf, 1, H_EXTERNAL);

err_env_relocate:
	env_set_default(NULL, 0);

	return -EIO;
}
#endif /* LOADENV */

U_BOOT_ENV_LOCATION(fat) = {
	.location	= ENVL_FAT,
	ENV_NAME("FAT")
#ifdef LOADENV
	.load		= env_fat_load,
#endif
	.save		= ENV_SAVE_PTR(env_fat_save),
};