blob: 43290d0832125f7ad98f78ec5df8db51b8689207 [file] [log] [blame]
Simon Glassc9d728d2017-08-03 12:22:00 -06001/*
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
11DECLARE_GLOBAL_DATA_PTR;
12
13static 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
29static enum env_location env_get_default_location(void)
30{
31 if IS_ENABLED(CONFIG_ENV_IS_IN_DATAFLASH)
32 return ENVL_DATAFLASH;
33 else if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM)
34 return ENVL_EEPROM;
35 else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT)
36 return ENVL_FAT;
37 else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH)
38 return ENVL_FLASH;
39 else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC)
40 return ENVL_MMC;
41 else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND)
42 return ENVL_NAND;
43 else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM)
44 return ENVL_NVRAM;
45 else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE)
46 return ENVL_REMOTE;
47 else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH)
48 return ENVL_SPI_FLASH;
49 else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI)
50 return ENVL_UBI;
51 else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE)
52 return ENVL_NOWHERE;
53 else
54 return ENVL_UNKNOWN;
55}
56
Simon Glassac358be2017-08-03 12:22:03 -060057struct env_driver *env_driver_lookup_default(void)
Simon Glassc9d728d2017-08-03 12:22:00 -060058{
59 enum env_location loc = env_get_default_location();
60 struct env_driver *drv;
61
62 drv = env_driver_lookup(loc);
63 if (!drv) {
64 debug("%s: No environment driver for location %d\n", __func__,
65 loc);
66 return NULL;
67 }
68
69 return drv;
70}
71
Simon Glassa69d0f62017-08-03 12:22:06 -060072int env_get_char(int index)
Simon Glassc9d728d2017-08-03 12:22:00 -060073{
74 struct env_driver *drv = env_driver_lookup_default();
75 int ret;
76
Simon Glass2d7cb5b2017-08-20 04:45:15 -060077 if (gd->env_valid == ENV_INVALID)
Simon Glassa69d0f62017-08-03 12:22:06 -060078 return default_environment[index];
Simon Glassc9d728d2017-08-03 12:22:00 -060079 if (!drv)
80 return -ENODEV;
81 if (!drv->get_char)
82 return *(uchar *)(gd->env_addr + index);
83 ret = drv->get_char(index);
84 if (ret < 0) {
85 debug("%s: Environment failed to load (err=%d)\n",
86 __func__, ret);
87 }
88
89 return ret;
90}
91
92int env_load(void)
93{
94 struct env_driver *drv = env_driver_lookup_default();
95 int ret = 0;
96
97 if (!drv)
98 return -ENODEV;
99 if (!drv->load)
100 return 0;
Simon Glassc55d8b92017-08-20 04:45:14 -0600101 ret = drv->load();
Simon Glassc9d728d2017-08-03 12:22:00 -0600102 if (ret) {
103 debug("%s: Environment failed to load (err=%d)\n", __func__,
104 ret);
105 return ret;
106 }
107
108 return 0;
109}
110
111int env_save(void)
112{
113 struct env_driver *drv = env_driver_lookup_default();
114 int ret;
115
116 if (!drv)
117 return -ENODEV;
118 if (!drv->save)
119 return -ENOSYS;
120 ret = drv->save();
121 if (ret) {
122 debug("%s: Environment failed to save (err=%d)\n", __func__,
123 ret);
124 return ret;
125 }
126
127 return 0;
128}
129
Simon Glass6eeae422017-08-03 12:22:05 -0600130int env_init(void)
Simon Glassc9d728d2017-08-03 12:22:00 -0600131{
132 struct env_driver *drv = env_driver_lookup_default();
Simon Glass79388222017-08-03 12:22:02 -0600133 int ret = -ENOENT;
Simon Glassc9d728d2017-08-03 12:22:00 -0600134
135 if (!drv)
136 return -ENODEV;
Simon Glass79388222017-08-03 12:22:02 -0600137 if (drv->init)
138 ret = drv->init();
139 if (ret == -ENOENT) {
140 gd->env_addr = (ulong)&default_environment[0];
Tom Rinieeba55c2017-08-19 22:27:57 -0400141 gd->env_valid = ENV_VALID;
Simon Glass79388222017-08-03 12:22:02 -0600142
143 return 0;
144 } else if (ret) {
Simon Glassc9d728d2017-08-03 12:22:00 -0600145 debug("%s: Environment failed to init (err=%d)\n", __func__,
146 ret);
147 return ret;
148 }
149
150 return 0;
151}