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https://github.com/brain-hackers/u-boot-brain
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![Marek Vasut](/assets/img/avatar_default.png)
Add another custom environment flag which discerns environment coming from external storage from environment set by U-Boot itself. Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
241 lines
5.4 KiB
C
241 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <eeprom.h>
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#include <env.h>
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#include <env_internal.h>
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#include <linux/stddef.h>
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#include <u-boot/crc.h>
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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#include <i2c.h>
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#endif
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#include <search.h>
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#include <errno.h>
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#include <linux/compiler.h> /* for BUG_ON */
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DECLARE_GLOBAL_DATA_PTR;
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static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt)
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{
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int rcode;
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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int old_bus = i2c_get_bus_num();
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
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#endif
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rcode = eeprom_read(dev_addr, offset, buffer, cnt);
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(old_bus);
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#endif
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return rcode;
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}
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static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt)
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{
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int rcode;
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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int old_bus = i2c_get_bus_num();
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
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#endif
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rcode = eeprom_write(dev_addr, offset, buffer, cnt);
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(old_bus);
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#endif
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return rcode;
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}
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/** Call this function from overridden env_get_char_spec() if you need
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* this functionality.
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*/
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int env_eeprom_get_char(int index)
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{
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uchar c;
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == ENV_REDUND)
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off = CONFIG_ENV_OFFSET_REDUND;
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#endif
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off + index + offsetof(env_t, data), &c, 1);
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return c;
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}
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static int env_eeprom_load(void)
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{
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char buf_env[CONFIG_ENV_SIZE];
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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ulong len, crc[2], crc_tmp;
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unsigned int off_env[2];
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uchar rdbuf[64], flags[2];
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int i, crc_ok[2] = {0, 0};
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eeprom_init(-1); /* prepare for EEPROM read/write */
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off_env[0] = CONFIG_ENV_OFFSET;
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off_env[1] = CONFIG_ENV_OFFSET_REDUND;
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for (i = 0; i < 2; i++) {
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/* read CRC */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_env[i] + offsetof(env_t, crc),
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(uchar *)&crc[i], sizeof(ulong));
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/* read FLAGS */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_env[i] + offsetof(env_t, flags),
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(uchar *)&flags[i], sizeof(uchar));
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crc_tmp = 0;
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len = ENV_SIZE;
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off = off_env[i] + offsetof(env_t, data);
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while (len > 0) {
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int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
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rdbuf, n);
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crc_tmp = crc32(crc_tmp, rdbuf, n);
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len -= n;
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off += n;
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}
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if (crc_tmp == crc[i])
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crc_ok[i] = 1;
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}
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if (!crc_ok[0] && !crc_ok[1]) {
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gd->env_addr = 0;
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gd->env_valid = ENV_INVALID;
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} else if (crc_ok[0] && !crc_ok[1]) {
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gd->env_valid = ENV_VALID;
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} else if (!crc_ok[0] && crc_ok[1]) {
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gd->env_valid = ENV_REDUND;
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} else {
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/* both ok - check serial */
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if (flags[0] == ENV_REDUND_ACTIVE &&
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flags[1] == ENV_REDUND_OBSOLETE)
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gd->env_valid = ENV_VALID;
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else if (flags[0] == ENV_REDUND_OBSOLETE &&
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flags[1] == ENV_REDUND_ACTIVE)
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gd->env_valid = ENV_REDUND;
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else if (flags[0] == 0xFF && flags[1] == 0)
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gd->env_valid = ENV_REDUND;
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else if (flags[1] == 0xFF && flags[0] == 0)
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gd->env_valid = ENV_VALID;
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else /* flags are equal - almost impossible */
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gd->env_valid = ENV_VALID;
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}
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#else /* CONFIG_ENV_OFFSET_REDUND */
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ulong crc, len, new;
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uchar rdbuf[64];
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eeprom_init(-1); /* prepare for EEPROM read/write */
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/* read old CRC */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET + offsetof(env_t, crc),
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(uchar *)&crc, sizeof(ulong));
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new = 0;
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len = ENV_SIZE;
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off = offsetof(env_t, data);
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while (len > 0) {
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int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET + off, rdbuf, n);
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new = crc32(new, rdbuf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_valid = ENV_VALID;
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} else {
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gd->env_valid = ENV_INVALID;
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}
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#endif /* CONFIG_ENV_OFFSET_REDUND */
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off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == ENV_REDUND)
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off = CONFIG_ENV_OFFSET_REDUND;
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#endif
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off, (uchar *)buf_env, CONFIG_ENV_SIZE);
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return env_import(buf_env, 1, H_EXTERNAL);
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}
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static int env_eeprom_save(void)
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{
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env_t env_new;
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int rc;
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
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char flag_obsolete = ENV_REDUND_OBSOLETE;
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#endif
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rc = env_export(&env_new);
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if (rc)
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return rc;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == ENV_VALID) {
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off = CONFIG_ENV_OFFSET_REDUND;
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off_red = CONFIG_ENV_OFFSET;
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}
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env_new.flags = ENV_REDUND_ACTIVE;
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#endif
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rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
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off, (uchar *)&env_new, CONFIG_ENV_SIZE);
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (rc == 0) {
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eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_red + offsetof(env_t, flags),
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(uchar *)&flag_obsolete, 1);
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if (gd->env_valid == ENV_VALID)
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gd->env_valid = ENV_REDUND;
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else
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gd->env_valid = ENV_VALID;
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}
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#endif
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return rc;
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}
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U_BOOT_ENV_LOCATION(eeprom) = {
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.location = ENVL_EEPROM,
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ENV_NAME("EEPROM")
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.load = env_eeprom_load,
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.save = env_save_ptr(env_eeprom_save),
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};
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