upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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283 lines
6.5 KiB
283 lines
6.5 KiB
/*
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* (C) Copyright 2000-2002
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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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.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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#ifdef CONFIG_ENV_OFFSET_REDUND
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#define ACTIVE_FLAG 1
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#define OBSOLETE_FLAG 0
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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env_t *env_ptr = NULL;
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char * env_name_spec = "EEPROM";
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int env_eeprom_bus = -1;
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static int eeprom_bus_read (unsigned dev_addr, unsigned offset, uchar *buffer,
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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 (gd->flags & GD_FLG_RELOC) {
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if (env_eeprom_bus == -1) {
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I2C_MUX_DEVICE *dev = NULL;
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dev = i2c_mux_ident_muxstring(
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(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
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if (dev != NULL) {
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env_eeprom_bus = dev->busid;
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} else
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printf ("error adding env eeprom bus.\n");
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}
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if (old_bus != env_eeprom_bus) {
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i2c_set_bus_num(env_eeprom_bus);
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old_bus = env_eeprom_bus;
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}
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} else {
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rcode = i2c_mux_ident_muxstring_f(
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(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
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}
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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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if (old_bus != 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, uchar *buffer,
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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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rcode = i2c_mux_ident_muxstring_f((uchar *)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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uchar env_get_char_spec (int index)
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{
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uchar c;
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unsigned int off;
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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 == 2)
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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),
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&c, 1);
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return (c);
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}
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void env_relocate_spec (void)
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{
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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 == 2)
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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,
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(uchar*)env_ptr,
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CONFIG_ENV_SIZE);
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}
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int saveenv(void)
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{
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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 = OBSOLETE_FLAG;
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if (gd->env_valid == 1) {
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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_ptr->flags = ACTIVE_FLAG;
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#endif
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rc = eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
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off,
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(uchar *)env_ptr,
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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,
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1);
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if (gd->env_valid == 1)
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gd->env_valid = 2;
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else
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gd->env_valid = 1;
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}
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#endif
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return rc;
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}
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/************************************************************************
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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* Use a (moderately small) buffer on the stack
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*/
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#ifdef CONFIG_ENV_OFFSET_REDUND
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int env_init(void)
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{
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ulong len;
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ulong crc[2], crc_tmp;
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unsigned int off, off_env[2];
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uchar buf[64];
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int crc_ok[2] = {0,0};
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unsigned char flags[2];
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int i;
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eeprom_init (); /* 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(buf)) ? sizeof(buf) : len;
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eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, off,
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buf, n);
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crc_tmp = crc32 (crc_tmp, buf, 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 = 0;
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return 0;
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} else if (crc_ok[0] && !crc_ok[1]) {
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gd->env_valid = 1;
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}
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else if (!crc_ok[0] && crc_ok[1]) {
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gd->env_valid = 2;
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} else {
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/* both ok - check serial */
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if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
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gd->env_valid = 1;
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else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
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gd->env_valid = 2;
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else if (flags[0] == 0xFF && flags[1] == 0)
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gd->env_valid = 2;
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else if(flags[1] == 0xFF && flags[0] == 0)
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gd->env_valid = 1;
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else /* flags are equal - almost impossible */
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gd->env_valid = 1;
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}
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if (gd->env_valid == 2)
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gd->env_addr = off_env[1] + offsetof(env_t,data);
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else if (gd->env_valid == 1)
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gd->env_addr = off_env[0] + offsetof(env_t,data);
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return (0);
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}
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#else
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int env_init(void)
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{
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ulong crc, len, new;
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unsigned off;
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uchar buf[64];
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eeprom_init (); /* 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(buf)) ? sizeof(buf) : len;
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eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET + off, buf, n);
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new = crc32 (new, buf, 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_addr = offsetof(env_t,data);
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gd->env_valid = 1;
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} else {
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gd->env_addr = 0;
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gd->env_valid = 0;
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}
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return (0);
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}
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#endif
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