1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2017 Google, Inc
3*4882a593Smuzhiyun * Written by Simon Glass <sjg@chromium.org>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <environment.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
12*4882a593Smuzhiyun
env_driver_lookup(enum env_location loc)13*4882a593Smuzhiyun static struct env_driver *env_driver_lookup(enum env_location loc)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun struct env_driver *drv;
16*4882a593Smuzhiyun const int n_ents = ll_entry_count(struct env_driver, env_driver);
17*4882a593Smuzhiyun struct env_driver *entry;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun drv = ll_entry_start(struct env_driver, env_driver);
20*4882a593Smuzhiyun for (entry = drv; entry != drv + n_ents; entry++) {
21*4882a593Smuzhiyun if (loc == entry->location)
22*4882a593Smuzhiyun return entry;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /* Not found */
26*4882a593Smuzhiyun return NULL;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
env_get_default_location(void)29*4882a593Smuzhiyun static enum env_location env_get_default_location(void)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM)
32*4882a593Smuzhiyun return ENVL_EEPROM;
33*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT)
34*4882a593Smuzhiyun return ENVL_FAT;
35*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH)
36*4882a593Smuzhiyun return ENVL_FLASH;
37*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC)
38*4882a593Smuzhiyun return ENVL_MMC;
39*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND)
40*4882a593Smuzhiyun return ENVL_NAND;
41*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM)
42*4882a593Smuzhiyun return ENVL_NVRAM;
43*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE)
44*4882a593Smuzhiyun return ENVL_REMOTE;
45*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH)
46*4882a593Smuzhiyun return ENVL_SPI_FLASH;
47*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI)
48*4882a593Smuzhiyun return ENVL_UBI;
49*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_IN_BLK_DEV)
50*4882a593Smuzhiyun return ENVL_BLK;
51*4882a593Smuzhiyun else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE)
52*4882a593Smuzhiyun return ENVL_NOWHERE;
53*4882a593Smuzhiyun else
54*4882a593Smuzhiyun return ENVL_UNKNOWN;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
env_driver_lookup_default(void)57*4882a593Smuzhiyun struct env_driver *env_driver_lookup_default(void)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun enum env_location loc = env_get_default_location();
60*4882a593Smuzhiyun struct env_driver *drv;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun drv = env_driver_lookup(loc);
63*4882a593Smuzhiyun if (!drv) {
64*4882a593Smuzhiyun debug("%s: No environment driver for location %d\n", __func__,
65*4882a593Smuzhiyun loc);
66*4882a593Smuzhiyun return NULL;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return drv;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
env_get_char(int index)72*4882a593Smuzhiyun int env_get_char(int index)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun struct env_driver *drv = env_driver_lookup_default();
75*4882a593Smuzhiyun int ret;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun if (gd->env_valid == ENV_INVALID)
78*4882a593Smuzhiyun return default_environment[index];
79*4882a593Smuzhiyun if (!drv)
80*4882a593Smuzhiyun return -ENODEV;
81*4882a593Smuzhiyun if (!drv->get_char)
82*4882a593Smuzhiyun return *(uchar *)(gd->env_addr + index);
83*4882a593Smuzhiyun ret = drv->get_char(index);
84*4882a593Smuzhiyun if (ret < 0) {
85*4882a593Smuzhiyun debug("%s: Environment failed to load (err=%d)\n",
86*4882a593Smuzhiyun __func__, ret);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun return ret;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
env_load(void)92*4882a593Smuzhiyun int env_load(void)
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun struct env_driver *drv = env_driver_lookup_default();
95*4882a593Smuzhiyun int ret = 0;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (!drv)
98*4882a593Smuzhiyun return -ENODEV;
99*4882a593Smuzhiyun if (!drv->load)
100*4882a593Smuzhiyun return 0;
101*4882a593Smuzhiyun ret = drv->load();
102*4882a593Smuzhiyun if (ret) {
103*4882a593Smuzhiyun debug("%s: Environment failed to load (err=%d)\n", __func__,
104*4882a593Smuzhiyun ret);
105*4882a593Smuzhiyun return ret;
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun return 0;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
env_save(void)111*4882a593Smuzhiyun int env_save(void)
112*4882a593Smuzhiyun {
113*4882a593Smuzhiyun struct env_driver *drv = env_driver_lookup_default();
114*4882a593Smuzhiyun int ret;
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun if (!drv)
117*4882a593Smuzhiyun return -ENODEV;
118*4882a593Smuzhiyun if (!drv->save)
119*4882a593Smuzhiyun return -ENOSYS;
120*4882a593Smuzhiyun ret = drv->save();
121*4882a593Smuzhiyun if (ret) {
122*4882a593Smuzhiyun debug("%s: Environment failed to save (err=%d)\n", __func__,
123*4882a593Smuzhiyun ret);
124*4882a593Smuzhiyun return ret;
125*4882a593Smuzhiyun }
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun return 0;
128*4882a593Smuzhiyun }
129*4882a593Smuzhiyun
env_init(void)130*4882a593Smuzhiyun int env_init(void)
131*4882a593Smuzhiyun {
132*4882a593Smuzhiyun struct env_driver *drv = env_driver_lookup_default();
133*4882a593Smuzhiyun int ret = -ENOENT;
134*4882a593Smuzhiyun
135*4882a593Smuzhiyun if (!drv)
136*4882a593Smuzhiyun return -ENODEV;
137*4882a593Smuzhiyun if (drv->init)
138*4882a593Smuzhiyun ret = drv->init();
139*4882a593Smuzhiyun if (ret == -ENOENT) {
140*4882a593Smuzhiyun gd->env_addr = (ulong)&default_environment[0];
141*4882a593Smuzhiyun gd->env_valid = ENV_VALID;
142*4882a593Smuzhiyun
143*4882a593Smuzhiyun return 0;
144*4882a593Smuzhiyun } else if (ret) {
145*4882a593Smuzhiyun debug("%s: Environment failed to init (err=%d)\n", __func__,
146*4882a593Smuzhiyun ret);
147*4882a593Smuzhiyun return ret;
148*4882a593Smuzhiyun }
149*4882a593Smuzhiyun
150*4882a593Smuzhiyun return 0;
151*4882a593Smuzhiyun }
152