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/*
* 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;
}
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;
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;
}
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