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env/env.c
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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_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_SATA ENVL_ESATA, #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 ", __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) ", ret); else printf("OK "); if (!ret) return 0; } return -ENODEV; } int env_save(void) { struct env_driver *drv; drv = env_driver_lookup(ENVOP_SAVE, 0); if (drv) { int ret; if (!drv->save) return -ENODEV; if (!env_has_inited(drv->location)) return -EPERM; printf("Saving Environment to %s... ", drv->name); ret = drv->save(); if (ret) printf("Failed (%d) ", ret); else printf("OK "); 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) ", __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; } |