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c9d728dd SG |
1 | /* |
2 | * Copyright (C) 2017 Google, Inc | |
3 | * Written by Simon Glass <sjg@chromium.org> | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #include <common.h> | |
9 | #include <environment.h> | |
10 | ||
11 | DECLARE_GLOBAL_DATA_PTR; | |
12 | ||
13 | static struct env_driver *env_driver_lookup(enum env_location loc) | |
14 | { | |
15 | struct env_driver *drv; | |
16 | const int n_ents = ll_entry_count(struct env_driver, env_driver); | |
17 | struct env_driver *entry; | |
18 | ||
19 | drv = ll_entry_start(struct env_driver, env_driver); | |
20 | for (entry = drv; entry != drv + n_ents; entry++) { | |
21 | if (loc == entry->location) | |
22 | return entry; | |
23 | } | |
24 | ||
25 | /* Not found */ | |
26 | return NULL; | |
27 | } | |
28 | ||
29 | static enum env_location env_get_default_location(void) | |
30 | { | |
7b7341d7 | 31 | if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM) |
c9d728dd SG |
32 | return ENVL_EEPROM; |
33 | else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT) | |
34 | return ENVL_FAT; | |
35 | else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH) | |
36 | return ENVL_FLASH; | |
37 | else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC) | |
38 | return ENVL_MMC; | |
39 | else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND) | |
40 | return ENVL_NAND; | |
41 | else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM) | |
42 | return ENVL_NVRAM; | |
43 | else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE) | |
44 | return ENVL_REMOTE; | |
45 | else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH) | |
46 | return ENVL_SPI_FLASH; | |
47 | else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI) | |
48 | return ENVL_UBI; | |
49 | else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE) | |
50 | return ENVL_NOWHERE; | |
51 | else | |
52 | return ENVL_UNKNOWN; | |
53 | } | |
54 | ||
ac358beb | 55 | struct env_driver *env_driver_lookup_default(void) |
c9d728dd SG |
56 | { |
57 | enum env_location loc = env_get_default_location(); | |
58 | struct env_driver *drv; | |
59 | ||
60 | drv = env_driver_lookup(loc); | |
61 | if (!drv) { | |
62 | debug("%s: No environment driver for location %d\n", __func__, | |
63 | loc); | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | return drv; | |
68 | } | |
69 | ||
a69d0f60 | 70 | int env_get_char(int index) |
c9d728dd SG |
71 | { |
72 | struct env_driver *drv = env_driver_lookup_default(); | |
73 | int ret; | |
74 | ||
2d7cb5b4 | 75 | if (gd->env_valid == ENV_INVALID) |
a69d0f60 | 76 | return default_environment[index]; |
c9d728dd SG |
77 | if (!drv) |
78 | return -ENODEV; | |
79 | if (!drv->get_char) | |
80 | return *(uchar *)(gd->env_addr + index); | |
81 | ret = drv->get_char(index); | |
82 | if (ret < 0) { | |
83 | debug("%s: Environment failed to load (err=%d)\n", | |
84 | __func__, ret); | |
85 | } | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
90 | int env_load(void) | |
91 | { | |
92 | struct env_driver *drv = env_driver_lookup_default(); | |
93 | int ret = 0; | |
94 | ||
95 | if (!drv) | |
96 | return -ENODEV; | |
97 | if (!drv->load) | |
98 | return 0; | |
c55d8b94 | 99 | ret = drv->load(); |
c9d728dd SG |
100 | if (ret) { |
101 | debug("%s: Environment failed to load (err=%d)\n", __func__, | |
102 | ret); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | int env_save(void) | |
110 | { | |
111 | struct env_driver *drv = env_driver_lookup_default(); | |
112 | int ret; | |
113 | ||
114 | if (!drv) | |
115 | return -ENODEV; | |
116 | if (!drv->save) | |
117 | return -ENOSYS; | |
118 | ret = drv->save(); | |
119 | if (ret) { | |
120 | debug("%s: Environment failed to save (err=%d)\n", __func__, | |
121 | ret); | |
122 | return ret; | |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
6eeae424 | 128 | int env_init(void) |
c9d728dd SG |
129 | { |
130 | struct env_driver *drv = env_driver_lookup_default(); | |
7938822a | 131 | int ret = -ENOENT; |
c9d728dd SG |
132 | |
133 | if (!drv) | |
134 | return -ENODEV; | |
7938822a SG |
135 | if (drv->init) |
136 | ret = drv->init(); | |
137 | if (ret == -ENOENT) { | |
138 | gd->env_addr = (ulong)&default_environment[0]; | |
eeba55cb | 139 | gd->env_valid = ENV_VALID; |
7938822a SG |
140 | |
141 | return 0; | |
142 | } else if (ret) { | |
c9d728dd SG |
143 | debug("%s: Environment failed to init (err=%d)\n", __func__, |
144 | ret); | |
145 | return ret; | |
146 | } | |
147 | ||
148 | return 0; | |
149 | } |