mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 17:07:38 +00:00
8344162ea8
When using a list of writeable variables, the initial values come from
the built-in default environment since commit 5ab8105836
("env: Complete generic support for writable list"). Remove leftover of
misuse of the env is nowhere driver as default environment.
Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
413 lines
9.1 KiB
C
413 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <env.h>
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#include <env_internal.h>
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#include <log.h>
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#include <asm/global_data.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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void env_fix_drivers(void)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (entry->name)
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entry->name += gd->reloc_off;
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if (entry->load)
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entry->load += gd->reloc_off;
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if (entry->save)
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entry->save += gd->reloc_off;
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if (entry->erase)
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entry->erase += gd->reloc_off;
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if (entry->init)
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entry->init += gd->reloc_off;
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}
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}
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#endif
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static struct env_driver *_env_driver_lookup(enum env_location loc)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (loc == entry->location)
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return entry;
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}
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/* Not found */
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return NULL;
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}
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static enum env_location env_locations[] = {
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#ifdef CONFIG_ENV_IS_IN_EEPROM
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ENVL_EEPROM,
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#endif
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#ifdef CONFIG_ENV_IS_IN_EXT4
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ENVL_EXT4,
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#endif
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#ifdef CONFIG_ENV_IS_IN_FAT
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ENVL_FAT,
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#endif
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#ifdef CONFIG_ENV_IS_IN_FLASH
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ENVL_FLASH,
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#endif
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#ifdef CONFIG_ENV_IS_IN_MMC
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ENVL_MMC,
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#endif
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#ifdef CONFIG_ENV_IS_IN_NAND
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ENVL_NAND,
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#endif
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#ifdef CONFIG_ENV_IS_IN_NVRAM
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ENVL_NVRAM,
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#endif
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#ifdef CONFIG_ENV_IS_IN_REMOTE
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ENVL_REMOTE,
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#endif
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#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
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ENVL_SPI_FLASH,
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#endif
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#ifdef CONFIG_ENV_IS_IN_UBI
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ENVL_UBI,
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#endif
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#ifdef CONFIG_ENV_IS_NOWHERE
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ENVL_NOWHERE,
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#endif
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};
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static bool env_has_inited(enum env_location location)
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{
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return gd->env_has_init & BIT(location);
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}
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static void env_set_inited(enum env_location location)
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{
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/*
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* We're using a 32-bits bitmask stored in gd (env_has_init)
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* using the above enum value as the bit index. We need to
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* make sure that we're not overflowing it.
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*/
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BUILD_BUG_ON(ENVL_COUNT > BITS_PER_LONG);
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gd->env_has_init |= BIT(location);
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}
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/**
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* arch_env_get_location() - Returns the best env location for an arch
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* @op: operations performed on the environment
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* @prio: priority between the multiple environments, 0 being the
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* highest priority
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*
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* This will return the preferred environment for the given priority.
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* This is overridable by architectures if they need to and has lower
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* priority than board side env_get_location() override.
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*
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* All implementations are free to use the operation, the priority and
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* any other data relevant to their choice, but must take into account
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* the fact that the lowest prority (0) is the most important location
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* in the system. The following locations should be returned by order
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* of descending priorities, from the highest to the lowest priority.
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*
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* Returns:
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* an enum env_location value on success, a negative error code otherwise
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*/
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__weak enum env_location arch_env_get_location(enum env_operation op, int prio)
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{
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if (prio >= ARRAY_SIZE(env_locations))
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return ENVL_UNKNOWN;
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return env_locations[prio];
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}
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/**
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* env_get_location() - Returns the best env location for a board
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* @op: operations performed on the environment
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* @prio: priority between the multiple environments, 0 being the
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* highest priority
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*
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* This will return the preferred environment for the given priority.
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* This is overridable by boards if they need to.
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*
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* All implementations are free to use the operation, the priority and
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* any other data relevant to their choice, but must take into account
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* the fact that the lowest prority (0) is the most important location
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* in the system. The following locations should be returned by order
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* of descending priorities, from the highest to the lowest priority.
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*
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* Returns:
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* an enum env_location value on success, a negative error code otherwise
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*/
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__weak enum env_location env_get_location(enum env_operation op, int prio)
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{
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return arch_env_get_location(op, prio);
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}
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/**
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* env_driver_lookup() - Finds the most suited environment location
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* @op: operations performed on the environment
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* @prio: priority between the multiple environments, 0 being the
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* highest priority
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*
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* This will try to find the available environment with the highest
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* priority in the system.
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*
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* Returns:
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* NULL on error, a pointer to a struct env_driver otherwise
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*/
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static struct env_driver *env_driver_lookup(enum env_operation op, int prio)
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{
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enum env_location loc = env_get_location(op, prio);
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struct env_driver *drv;
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if (loc == ENVL_UNKNOWN)
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return NULL;
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drv = _env_driver_lookup(loc);
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if (!drv) {
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debug("%s: No environment driver for location %d\n", __func__,
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loc);
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return NULL;
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}
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return drv;
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}
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int env_load(void)
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{
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struct env_driver *drv;
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int best_prio = -1;
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int prio;
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if (CONFIG_IS_ENABLED(ENV_WRITEABLE_LIST)) {
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/*
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* When using a list of writeable variables, the baseline comes
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* from the built-in default env. So load this first.
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*/
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env_set_default(NULL, 0);
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}
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for (prio = 0; (drv = env_driver_lookup(ENVOP_LOAD, prio)); prio++) {
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int ret;
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if (!env_has_inited(drv->location))
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continue;
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printf("Loading Environment from %s... ", drv->name);
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/*
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* In error case, the error message must be printed during
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* drv->load() in some underlying API, and it must be exactly
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* one message.
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*/
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ret = drv->load();
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if (!ret) {
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printf("OK\n");
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gd->env_load_prio = prio;
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return 0;
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} else if (ret == -ENOMSG) {
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/* Handle "bad CRC" case */
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if (best_prio == -1)
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best_prio = prio;
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} else {
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debug("Failed (%d)\n", ret);
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}
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}
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/*
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* In case of invalid environment, we set the 'default' env location
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* to the best choice, i.e.:
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* 1. Environment location with bad CRC, if such location was found
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* 2. Otherwise use the location with highest priority
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*
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* This way, next calls to env_save() will restore the environment
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* at the right place.
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*/
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if (best_prio >= 0)
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debug("Selecting environment with bad CRC\n");
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else
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best_prio = 0;
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gd->env_load_prio = best_prio;
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return -ENODEV;
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}
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int env_reload(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_LOAD, gd->env_load_prio);
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if (drv) {
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int ret;
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printf("Loading Environment from %s... ", drv->name);
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if (!env_has_inited(drv->location)) {
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printf("not initialized\n");
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return -ENODEV;
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}
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ret = drv->load();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_save(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_SAVE, gd->env_load_prio);
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if (drv) {
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int ret;
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printf("Saving Environment to %s... ", drv->name);
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if (!drv->save) {
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printf("not possible\n");
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return -ENODEV;
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}
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if (!env_has_inited(drv->location)) {
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printf("not initialized\n");
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return -ENODEV;
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}
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ret = drv->save();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_erase(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_ERASE, gd->env_load_prio);
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if (drv) {
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int ret;
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if (!drv->erase) {
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printf("not possible\n");
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return -ENODEV;
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}
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if (!env_has_inited(drv->location)) {
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printf("not initialized\n");
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return -ENODEV;
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}
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printf("Erasing Environment on %s... ", drv->name);
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ret = drv->erase();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_init(void)
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{
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struct env_driver *drv;
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int ret = -ENOENT;
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int prio;
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for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
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if (!drv->init || !(ret = drv->init()))
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env_set_inited(drv->location);
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if (ret == -ENOENT)
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env_set_inited(drv->location);
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debug("%s: Environment %s init done (ret=%d)\n", __func__,
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drv->name, ret);
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if (gd->env_valid == ENV_INVALID)
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ret = -ENOENT;
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}
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if (!prio)
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return -ENODEV;
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if (ret == -ENOENT) {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = ENV_VALID;
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return 0;
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}
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return ret;
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}
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int env_select(const char *name)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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int prio;
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bool found = false;
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printf("Select Environment on %s: ", name);
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/* search ENV driver by name */
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (!strcmp(entry->name, name)) {
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found = true;
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break;
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}
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}
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if (!found) {
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printf("driver not found\n");
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return -ENODEV;
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}
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/* search priority by driver */
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for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
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if (entry->location == env_get_location(ENVOP_LOAD, prio)) {
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/* when priority change, reset the ENV flags */
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if (gd->env_load_prio != prio) {
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gd->env_load_prio = prio;
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gd->env_valid = ENV_INVALID;
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gd->flags &= ~GD_FLG_ENV_DEFAULT;
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}
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printf("OK\n");
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return 0;
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}
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}
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printf("priority not found\n");
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return -ENODEV;
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}
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