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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;
}
/**
* env_get_location() - Returns the best env location for a board
* @op: operations performed on the environment
* @prio: priority between the multiple environments, 0 being the
* highest priority
*
* This will return the preferred environment for the given priority.
*
* All implementations are free to use the operation, the priority and
* any other data relevant to their choice, but must take into account
* the fact that the lowest prority (0) is the most important location
* in the system. The following locations should be returned by order
* of descending priorities, from the highest to the lowest priority.
*
* Returns:
* an enum env_location value on success, a negative error code otherwise
*/
static enum env_location env_get_location(enum env_operation op, int prio)
{
/*
* We support a single environment, so any environment asked
* with a priority that is not zero is out of our supported
* bounds.
*/
if (prio >= 1)
return ENVL_UNKNOWN;
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;
}
/**
* env_driver_lookup() - Finds the most suited environment location
* @op: operations performed on the environment
* @prio: priority between the multiple environments, 0 being the
* highest priority
*
* This will try to find the available environment with the highest
* priority in the system.
*
* Returns:
* NULL on error, a pointer to a struct env_driver otherwise
*/
static struct env_driver *env_driver_lookup(enum env_operation op, int prio)
{
enum env_location loc = env_get_location(op, prio);
struct env_driver *drv;
if (loc == ENVL_UNKNOWN)
return NULL;
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;
int prio;
if (gd->env_valid == ENV_INVALID)
return default_environment[index];
for (prio = 0; (drv = env_driver_lookup(ENVOP_GET_CHAR, prio)); prio++) {
int ret;
if (!drv->get_char)
continue;
ret = drv->get_char(index);
if (!ret)
return 0;
debug("%s: Environment %s failed to load (err=%d)\n", __func__,
drv->name, ret);
}
return -ENODEV;
}
int env_load(void)
{
struct env_driver *drv;
int prio;
for (prio = 0; (drv = env_driver_lookup(ENVOP_LOAD, prio)); prio++) {
int ret;
if (!drv->load)
continue;
ret = drv->load();
if (!ret)
return 0;
debug("%s: Environment %s failed to load (err=%d)\n", __func__,
drv->name, ret);
}
return -ENODEV;
}
int env_save(void)
{
struct env_driver *drv;
int prio;
for (prio = 0; (drv = env_driver_lookup(ENVOP_SAVE, prio)); prio++) {
int ret;
if (!drv->save)
continue;
printf("Saving Environment to %s... ", drv->name);
ret = drv->save();
printf("%s\n", ret ? "Failed" : "OK");
if (!ret)
return 0;
debug("%s: Environment %s failed to save (err=%d)\n", __func__,
drv->name, ret);
}
return -ENODEV;
}
int env_init(void)
{
struct env_driver *drv;
int ret = -ENOENT;
int prio;
for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
if (!drv->init)
continue;
ret = drv->init();
if (!ret)
return 0;
debug("%s: Environment %s failed to init (err=%d)\n", __func__,
drv->name, ret);
}
if (!prio)
return -ENODEV;
if (ret == -ENOENT) {
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = ENV_VALID;
return 0;
}
return ret;
}
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