env.c
3.05 KB
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
/*
* Copyright (C) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <environment.h>
DECLARE_GLOBAL_DATA_PTR;
static struct env_driver *env_driver_lookup(enum env_location loc)
{
struct env_driver *drv;
const int n_ents = ll_entry_count(struct env_driver, env_driver);
struct env_driver *entry;
drv = ll_entry_start(struct env_driver, env_driver);
for (entry = drv; entry != drv + n_ents; entry++) {
if (loc == entry->location)
return entry;
}
/* Not found */
return NULL;
}
static enum env_location env_get_default_location(void)
{
if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM)
return ENVL_EEPROM;
else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT)
return ENVL_FAT;
else if IS_ENABLED(CONFIG_ENV_IS_IN_EXT4)
return ENVL_EXT4;
else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH)
return ENVL_FLASH;
else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC)
return ENVL_MMC;
else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND)
return ENVL_NAND;
else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM)
return ENVL_NVRAM;
else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE)
return ENVL_REMOTE;
else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH)
return ENVL_SPI_FLASH;
else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI)
return ENVL_UBI;
else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE)
return ENVL_NOWHERE;
else
return ENVL_UNKNOWN;
}
static struct env_driver *env_driver_lookup_default(void)
{
enum env_location loc = env_get_default_location();
struct env_driver *drv;
drv = env_driver_lookup(loc);
if (!drv) {
debug("%s: No environment driver for location %d\n", __func__,
loc);
return NULL;
}
return drv;
}
int env_get_char(int index)
{
struct env_driver *drv = env_driver_lookup_default();
int ret;
if (gd->env_valid == ENV_INVALID)
return default_environment[index];
if (!drv)
return -ENODEV;
if (!drv->get_char)
return *(uchar *)(gd->env_addr + index);
ret = drv->get_char(index);
if (ret < 0) {
debug("%s: Environment failed to load (err=%d)\n",
__func__, ret);
}
return ret;
}
int env_load(void)
{
struct env_driver *drv = env_driver_lookup_default();
int ret = 0;
if (!drv)
return -ENODEV;
if (!drv->load)
return 0;
ret = drv->load();
if (ret) {
debug("%s: Environment failed to load (err=%d)\n", __func__,
ret);
return ret;
}
return 0;
}
int env_save(void)
{
struct env_driver *drv = env_driver_lookup_default();
int ret;
if (!drv)
return -ENODEV;
if (!drv->save)
return -ENOSYS;
printf("Saving Environment to %s...\n", drv->name);
ret = drv->save();
if (ret) {
debug("%s: Environment failed to save (err=%d)\n", __func__,
ret);
return ret;
}
return 0;
}
int env_init(void)
{
struct env_driver *drv = env_driver_lookup_default();
int ret = -ENOENT;
if (!drv)
return -ENODEV;
if (drv->init)
ret = drv->init();
if (ret == -ENOENT) {
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = ENV_VALID;
return 0;
} else if (ret) {
debug("%s: Environment failed to init (err=%d)\n", __func__,
ret);
return ret;
}
return 0;
}