common/env_eeprom.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000-2002
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Andreas Heppel <aheppel@sysgo.de>

  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>
 #include <command.h>
 #include <environment.h>
 #include <linux/stddef.h>
 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
 #include <i2c.h>
 #endif

 #ifdef CONFIG_ENV_OFFSET_REDUND
 #define ACTIVE_FLAG   1
 #define OBSOLETE_FLAG 0
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 env_t *env_ptr = NULL;

 char * env_name_spec = "EEPROM";
 int env_eeprom_bus = -1;

 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 (gd->flags & GD_FLG_RELOC) {
 		if (env_eeprom_bus == -1) {
 			I2C_MUX_DEVICE *dev = NULL;
 			dev = i2c_mux_ident_muxstring(
 				(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
 			if (dev != NULL) {
 				env_eeprom_bus = dev->busid;
 			} else
 				printf ("error adding env eeprom bus.\n");
 		}
 		if (old_bus != env_eeprom_bus) {
 			i2c_set_bus_num(env_eeprom_bus);
 			old_bus = env_eeprom_bus;
 		}
 	} else {
 		rcode = i2c_mux_ident_muxstring_f(
 				(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
 	}
 #endif

 	rcode = eeprom_read (dev_addr, offset, buffer, cnt);
 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
 	if (old_bus != 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();

 	rcode = i2c_mux_ident_muxstring_f((uchar *)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;
 }

 uchar env_get_char_spec (int index)
 {
 	uchar c;
 	unsigned int off;
 	off = CONFIG_ENV_OFFSET;
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	if (gd->env_valid == 2)
 		off = CONFIG_ENV_OFFSET_REDUND;
 #endif

 	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
 		     off + index + offsetof(env_t,data),
 		     &c, 1);

 	return (c);
 }

 void env_relocate_spec (void)
 {
 	unsigned int off = CONFIG_ENV_OFFSET;
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	if (gd->env_valid == 2)
 		off = CONFIG_ENV_OFFSET_REDUND;
 #endif
 	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
 		     off,
 		     (uchar*)env_ptr,
 		     CONFIG_ENV_SIZE);
 }

 int saveenv(void)
 {
 	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;
 	if (gd->env_valid == 1) {
 		off = CONFIG_ENV_OFFSET_REDUND;
 		off_red = CONFIG_ENV_OFFSET;
 	}

 	env_ptr->flags = ACTIVE_FLAG;
 #endif

 	rc = eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
 			     off,
 			     (uchar *)env_ptr,
 			     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 == 1)
 			gd->env_valid = 2;
 		else
 			gd->env_valid = 1;

 	}
 #endif

 	return rc;
 }

 /************************************************************************
  * Initialize Environment use
  *
  * We are still running from ROM, so data use is limited
  * Use a (moderately small) buffer on the stack
  */

 #ifdef CONFIG_ENV_OFFSET_REDUND
 int env_init(void)
 {
 	ulong len;
 	ulong crc[2], crc_tmp;
 	unsigned int off, off_env[2];
 	uchar buf[64];
 	int crc_ok[2] = {0,0};
 	unsigned char flags[2];
 	int i;

 	eeprom_init ();	/* 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(buf)) ? sizeof(buf) : len;

 			eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, off,
 				buf, n);

 			crc_tmp = crc32 (crc_tmp, buf, 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 = 0;

 		return 0;
 	} else if (crc_ok[0] && !crc_ok[1]) {
 		gd->env_valid = 1;
 	}
 	else if (!crc_ok[0] && crc_ok[1]) {
 		gd->env_valid = 2;
 	} else {
 		/* both ok - check serial */
 		if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
 			gd->env_valid = 1;
 		else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
 			gd->env_valid = 2;
 		else if (flags[0] == 0xFF && flags[1] == 0)
 			gd->env_valid = 2;
 		else if(flags[1] == 0xFF && flags[0] == 0)
 			gd->env_valid = 1;
 		else /* flags are equal - almost impossible */
 			gd->env_valid = 1;
 	}

 	if (gd->env_valid == 2)
 		gd->env_addr = off_env[1] + offsetof(env_t,data);
 	else if (gd->env_valid == 1)
 		gd->env_addr = off_env[0] + offsetof(env_t,data);

 	return (0);
 }
 #else
 int env_init(void)
 {
 	ulong crc, len, new;
 	unsigned off;
 	uchar buf[64];

 	eeprom_init ();	/* 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(buf)) ? sizeof(buf) : len;

 		eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
 				CONFIG_ENV_OFFSET + off, buf, n);
 		new = crc32 (new, buf, n);
 		len -= n;
 		off += n;
 	}

 	if (crc == new) {
 		gd->env_addr  = offsetof(env_t,data);
 		gd->env_valid = 1;
 	} else {
 		gd->env_addr  = 0;
 		gd->env_valid = 0;
 	}

 	return (0);
 }
 #endif
	/*
	* (C) Copyright 2000-2002
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Andreas Heppel <aheppel@sysgo.de>

	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>
	#include <command.h>
	#include <environment.h>
	#include <linux/stddef.h>
	#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
	#include <i2c.h>
	#endif

	#ifdef CONFIG_ENV_OFFSET_REDUND
	#define ACTIVE_FLAG 1
	#define OBSOLETE_FLAG 0
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	env_t *env_ptr = NULL;

	char * env_name_spec = "EEPROM";
	int env_eeprom_bus = -1;

	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 (gd->flags & GD_FLG_RELOC) {
	if (env_eeprom_bus == -1) {
	I2C_MUX_DEVICE *dev = NULL;
	dev = i2c_mux_ident_muxstring(
	(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
	if (dev != NULL) {
	env_eeprom_bus = dev->busid;
	} else
	printf ("error adding env eeprom bus.\n");
	}
	if (old_bus != env_eeprom_bus) {
	i2c_set_bus_num(env_eeprom_bus);
	old_bus = env_eeprom_bus;
	}
	} else {
	rcode = i2c_mux_ident_muxstring_f(
	(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
	}
	#endif

	rcode = eeprom_read (dev_addr, offset, buffer, cnt);
	#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
	if (old_bus != 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();

	rcode = i2c_mux_ident_muxstring_f((uchar *)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;
	}

	uchar env_get_char_spec (int index)
	{
	uchar c;
	unsigned int off;
	off = CONFIG_ENV_OFFSET;
	#ifdef CONFIG_ENV_OFFSET_REDUND
	if (gd->env_valid == 2)
	off = CONFIG_ENV_OFFSET_REDUND;
	#endif

	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
	off + index + offsetof(env_t,data),
	&c, 1);

	return (c);
	}

	void env_relocate_spec (void)
	{
	unsigned int off = CONFIG_ENV_OFFSET;
	#ifdef CONFIG_ENV_OFFSET_REDUND
	if (gd->env_valid == 2)
	off = CONFIG_ENV_OFFSET_REDUND;
	#endif
	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
	off,
	(uchar*)env_ptr,
	CONFIG_ENV_SIZE);
	}

	int saveenv(void)
	{
	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;
	if (gd->env_valid == 1) {
	off = CONFIG_ENV_OFFSET_REDUND;
	off_red = CONFIG_ENV_OFFSET;
	}

	env_ptr->flags = ACTIVE_FLAG;
	#endif

	rc = eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
	off,
	(uchar *)env_ptr,
	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 == 1)
	gd->env_valid = 2;
	else
	gd->env_valid = 1;

	}
	#endif

	return rc;
	}

	/************************************************************************
	* Initialize Environment use
	*
	* We are still running from ROM, so data use is limited
	* Use a (moderately small) buffer on the stack
	*/

	#ifdef CONFIG_ENV_OFFSET_REDUND
	int env_init(void)
	{
	ulong len;
	ulong crc[2], crc_tmp;
	unsigned int off, off_env[2];
	uchar buf[64];
	int crc_ok[2] = {0,0};
	unsigned char flags[2];
	int i;

	eeprom_init (); /* 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(buf)) ? sizeof(buf) : len;

	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, off,
	buf, n);

	crc_tmp = crc32 (crc_tmp, buf, 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 = 0;

	return 0;
	} else if (crc_ok[0] && !crc_ok[1]) {
	gd->env_valid = 1;
	}
	else if (!crc_ok[0] && crc_ok[1]) {
	gd->env_valid = 2;
	} else {
	/* both ok - check serial */
	if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
	gd->env_valid = 1;
	else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
	gd->env_valid = 2;
	else if (flags[0] == 0xFF && flags[1] == 0)
	gd->env_valid = 2;
	else if(flags[1] == 0xFF && flags[0] == 0)
	gd->env_valid = 1;
	else /* flags are equal - almost impossible */
	gd->env_valid = 1;
	}

	if (gd->env_valid == 2)
	gd->env_addr = off_env[1] + offsetof(env_t,data);
	else if (gd->env_valid == 1)
	gd->env_addr = off_env[0] + offsetof(env_t,data);

	return (0);
	}
	#else
	int env_init(void)
	{
	ulong crc, len, new;
	unsigned off;
	uchar buf[64];

	eeprom_init (); /* 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(buf)) ? sizeof(buf) : len;

	eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
	CONFIG_ENV_OFFSET + off, buf, n);
	new = crc32 (new, buf, n);
	len -= n;
	off += n;
	}

	if (crc == new) {
	gd->env_addr = offsetof(env_t,data);
	gd->env_valid = 1;
	} else {
	gd->env_addr = 0;
	gd->env_valid = 0;
	}

	return (0);
	}
	#endif