u-boot/env/env.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

264 lines
5.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <environment.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
void env_fix_drivers(void)
{
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 (entry->name)
entry->name += gd->reloc_off;
if (entry->load)
entry->load += gd->reloc_off;
if (entry->save)
entry->save += gd->reloc_off;
if (entry->init)
entry->init += gd->reloc_off;
}
}
#endif
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_locations[] = {
#ifdef CONFIG_ENV_IS_IN_EEPROM
ENVL_EEPROM,
#endif
#ifdef CONFIG_ENV_IS_IN_EXT4
ENVL_EXT4,
#endif
#ifdef CONFIG_ENV_IS_IN_FAT
ENVL_FAT,
#endif
#ifdef CONFIG_ENV_IS_IN_FLASH
ENVL_FLASH,
#endif
#ifdef CONFIG_ENV_IS_IN_MMC
ENVL_MMC,
#endif
#ifdef CONFIG_ENV_IS_IN_NAND
ENVL_NAND,
#endif
#ifdef CONFIG_ENV_IS_IN_NVRAM
ENVL_NVRAM,
#endif
#ifdef CONFIG_ENV_IS_IN_REMOTE
ENVL_REMOTE,
#endif
#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
ENVL_SPI_FLASH,
#endif
#ifdef CONFIG_ENV_IS_IN_UBI
ENVL_UBI,
#endif
#ifdef CONFIG_ENV_IS_NOWHERE
ENVL_NOWHERE,
#endif
};
static bool env_has_inited(enum env_location location)
{
return gd->env_has_init & BIT(location);
}
static void env_set_inited(enum env_location location)
{
/*
* We're using a 32-bits bitmask stored in gd (env_has_init)
* using the above enum value as the bit index. We need to
* make sure that we're not overflowing it.
*/
BUILD_BUG_ON(ARRAY_SIZE(env_locations) > BITS_PER_LONG);
gd->env_has_init |= BIT(location);
}
/**
* 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.
* This is overridable by boards if they need to.
*
* 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
*/
__weak enum env_location env_get_location(enum env_operation op, int prio)
{
switch (op) {
case ENVOP_GET_CHAR:
case ENVOP_INIT:
case ENVOP_LOAD:
if (prio >= ARRAY_SIZE(env_locations))
return ENVL_UNKNOWN;
gd->env_load_location = env_locations[prio];
return gd->env_load_location;
case ENVOP_SAVE:
return gd->env_load_location;
}
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;
}
__weak int env_get_char_spec(int index)
{
return *(uchar *)(gd->env_addr + index);
}
int env_get_char(int index)
{
if (gd->env_valid == ENV_INVALID)
return default_environment[index];
else
return env_get_char_spec(index);
}
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;
if (!env_has_inited(drv->location))
continue;
printf("Loading Environment from %s... ", drv->name);
ret = drv->load();
if (ret)
printf("Failed (%d)\n", ret);
else
printf("OK\n");
if (!ret)
return 0;
}
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;
if (!env_has_inited(drv->location))
continue;
printf("Saving Environment to %s... ", drv->name);
ret = drv->save();
if (ret)
printf("Failed (%d)\n", ret);
else
printf("OK\n");
if (!ret)
return 0;
}
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 || !(ret = drv->init()))
env_set_inited(drv->location);
debug("%s: Environment %s init done (ret=%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;
}