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env/eeprom.c
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d41ce506b Initial Release, ... |
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/* * (C) Copyright 2000-2010 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Andreas Heppel <aheppel@sysgo.de> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <environment.h> #include <linux/stddef.h> #if defined(CONFIG_I2C_ENV_EEPROM_BUS) #include <i2c.h> #endif #include <search.h> #include <errno.h> #include <linux/compiler.h> /* for BUG_ON */ DECLARE_GLOBAL_DATA_PTR; static int eeprom_bus_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) { int rcode; #if defined(CONFIG_I2C_ENV_EEPROM_BUS) int old_bus = i2c_get_bus_num(); if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); #endif rcode = eeprom_read(dev_addr, offset, buffer, cnt); #if defined(CONFIG_I2C_ENV_EEPROM_BUS) i2c_set_bus_num(old_bus); #endif return rcode; } static int eeprom_bus_write(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) { int rcode; #if defined(CONFIG_I2C_ENV_EEPROM_BUS) int old_bus = i2c_get_bus_num(); if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); #endif rcode = eeprom_write(dev_addr, offset, buffer, cnt); #if defined(CONFIG_I2C_ENV_EEPROM_BUS) i2c_set_bus_num(old_bus); #endif return rcode; } /** Call this function from overridden env_get_char_spec() if you need * this functionality. */ int env_eeprom_get_char(int index) { uchar c; unsigned int off = CONFIG_ENV_OFFSET; #ifdef CONFIG_ENV_OFFSET_REDUND if (gd->env_valid == ENV_REDUND) off = CONFIG_ENV_OFFSET_REDUND; #endif eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off + index + offsetof(env_t, data), &c, 1); return c; } static int env_eeprom_load(void) { char buf_env[CONFIG_ENV_SIZE]; unsigned int off = CONFIG_ENV_OFFSET; #ifdef CONFIG_ENV_OFFSET_REDUND ulong len, crc[2], crc_tmp; unsigned int off_env[2]; uchar rdbuf[64], flags[2]; int i, crc_ok[2] = {0, 0}; eeprom_init(-1); /* prepare for EEPROM read/write */ off_env[0] = CONFIG_ENV_OFFSET; off_env[1] = CONFIG_ENV_OFFSET_REDUND; for (i = 0; i < 2; i++) { /* read CRC */ eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off_env[i] + offsetof(env_t, crc), (uchar *)&crc[i], sizeof(ulong)); /* read FLAGS */ eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off_env[i] + offsetof(env_t, flags), (uchar *)&flags[i], sizeof(uchar)); crc_tmp = 0; len = ENV_SIZE; off = off_env[i] + offsetof(env_t, data); while (len > 0) { int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, rdbuf, n); crc_tmp = crc32(crc_tmp, rdbuf, n); len -= n; off += n; } if (crc_tmp == crc[i]) crc_ok[i] = 1; } if (!crc_ok[0] && !crc_ok[1]) { gd->env_addr = 0; gd->env_valid = ENV_INVALID; } else if (crc_ok[0] && !crc_ok[1]) { gd->env_valid = ENV_VALID; } else if (!crc_ok[0] && crc_ok[1]) { gd->env_valid = ENV_REDUND; } else { /* both ok - check serial */ if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) gd->env_valid = ENV_VALID; else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) gd->env_valid = ENV_REDUND; else if (flags[0] == 0xFF && flags[1] == 0) gd->env_valid = ENV_REDUND; else if (flags[1] == 0xFF && flags[0] == 0) gd->env_valid = ENV_VALID; else /* flags are equal - almost impossible */ gd->env_valid = ENV_VALID; } #else /* CONFIG_ENV_OFFSET_REDUND */ ulong crc, len, new; uchar rdbuf[64]; eeprom_init(-1); /* prepare for EEPROM read/write */ /* read old CRC */ eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, CONFIG_ENV_OFFSET + offsetof(env_t, crc), (uchar *)&crc, sizeof(ulong)); new = 0; len = ENV_SIZE; off = offsetof(env_t, data); while (len > 0) { int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, CONFIG_ENV_OFFSET + off, rdbuf, n); new = crc32(new, rdbuf, n); len -= n; off += n; } if (crc == new) { gd->env_valid = ENV_VALID; } else { gd->env_valid = ENV_INVALID; } #endif /* CONFIG_ENV_OFFSET_REDUND */ off = CONFIG_ENV_OFFSET; #ifdef CONFIG_ENV_OFFSET_REDUND if (gd->env_valid == ENV_REDUND) off = CONFIG_ENV_OFFSET_REDUND; #endif eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, (uchar *)buf_env, CONFIG_ENV_SIZE); return env_import(buf_env, 1); } static int env_eeprom_save(void) { env_t env_new; int rc; unsigned int off = CONFIG_ENV_OFFSET; #ifdef CONFIG_ENV_OFFSET_REDUND unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; char flag_obsolete = OBSOLETE_FLAG; #endif rc = env_export(&env_new); if (rc) return rc; #ifdef CONFIG_ENV_OFFSET_REDUND if (gd->env_valid == ENV_VALID) { off = CONFIG_ENV_OFFSET_REDUND; off_red = CONFIG_ENV_OFFSET; } env_new.flags = ACTIVE_FLAG; #endif rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, off, (uchar *)&env_new, CONFIG_ENV_SIZE); #ifdef CONFIG_ENV_OFFSET_REDUND if (rc == 0) { eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, off_red + offsetof(env_t, flags), (uchar *)&flag_obsolete, 1); if (gd->env_valid == ENV_VALID) gd->env_valid = ENV_REDUND; else gd->env_valid = ENV_VALID; } #endif return rc; } U_BOOT_ENV_LOCATION(eeprom) = { .location = ENVL_EEPROM, ENV_NAME("EEPROM") .load = env_eeprom_load, .save = env_save_ptr(env_eeprom_save), }; |