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wdenk0bc4a1a2002-09-18 11:09:59 +00001/*
Wolfgang Denkea882ba2010-06-20 23:33:59 +02002 * (C) Copyright 2000-2010
wdenk0bc4a1a2002-09-18 11:09:59 +00003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6 * Andreas Heppel <aheppel@sysgo.de>
Wolfgang Denkea882ba2010-06-20 23:33:59 +02007 *
Wolfgang Denk3765b3e2013-10-07 13:07:26 +02008 * SPDX-License-Identifier: GPL-2.0+
wdenk0bc4a1a2002-09-18 11:09:59 +00009 */
10
11#include <common.h>
wdenk0bc4a1a2002-09-18 11:09:59 +000012#include <command.h>
13#include <environment.h>
wdenk0bc4a1a2002-09-18 11:09:59 +000014#include <linux/stddef.h>
Heiko Schocher548738b2010-01-07 08:55:40 +010015#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
16#include <i2c.h>
17#endif
Wolfgang Denkea882ba2010-06-20 23:33:59 +020018#include <search.h>
19#include <errno.h>
20#include <linux/compiler.h> /* for BUG_ON */
wdenk0bc4a1a2002-09-18 11:09:59 +000021
Wolfgang Denkd87080b2006-03-31 18:32:53 +020022DECLARE_GLOBAL_DATA_PTR;
23
Igor Grinbergdd2a2332011-11-07 01:14:07 +000024env_t *env_ptr;
wdenk0bc4a1a2002-09-18 11:09:59 +000025
Wolfgang Denkea882ba2010-06-20 23:33:59 +020026char *env_name_spec = "EEPROM";
Heiko Schocher548738b2010-01-07 08:55:40 +010027
Wolfgang Denkea882ba2010-06-20 23:33:59 +020028static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
Igor Grinbergdd2a2332011-11-07 01:14:07 +000029 uchar *buffer, unsigned cnt)
Heiko Schocher548738b2010-01-07 08:55:40 +010030{
31 int rcode;
32#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
33 int old_bus = i2c_get_bus_num();
34
Heiko Schocher3f4978c2012-01-16 21:12:24 +000035 if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
36 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
Heiko Schocher548738b2010-01-07 08:55:40 +010037#endif
38
Igor Grinbergdd2a2332011-11-07 01:14:07 +000039 rcode = eeprom_read(dev_addr, offset, buffer, cnt);
Wolfgang Denkea882ba2010-06-20 23:33:59 +020040
Heiko Schocher548738b2010-01-07 08:55:40 +010041#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
Alexey Brodkin6d001e72013-12-11 18:04:40 +040042 i2c_set_bus_num(old_bus);
Heiko Schocher548738b2010-01-07 08:55:40 +010043#endif
Heiko Schocher9a2accb2012-10-25 10:32:14 +020044
Heiko Schocher548738b2010-01-07 08:55:40 +010045 return rcode;
46}
47
Wolfgang Denkea882ba2010-06-20 23:33:59 +020048static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
Igor Grinbergdd2a2332011-11-07 01:14:07 +000049 uchar *buffer, unsigned cnt)
Heiko Schocher548738b2010-01-07 08:55:40 +010050{
51 int rcode;
52#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
53 int old_bus = i2c_get_bus_num();
54
Heiko Schocher3f4978c2012-01-16 21:12:24 +000055 if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
56 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
Heiko Schocher548738b2010-01-07 08:55:40 +010057#endif
Heiko Schocher9a2accb2012-10-25 10:32:14 +020058
Wolfgang Denkea882ba2010-06-20 23:33:59 +020059 rcode = eeprom_write(dev_addr, offset, buffer, cnt);
Heiko Schocher9a2accb2012-10-25 10:32:14 +020060
Heiko Schocher548738b2010-01-07 08:55:40 +010061#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
62 i2c_set_bus_num(old_bus);
63#endif
Alexey Brodkin6d001e72013-12-11 18:04:40 +040064
Heiko Schocher548738b2010-01-07 08:55:40 +010065 return rcode;
66}
wdenk0bc4a1a2002-09-18 11:09:59 +000067
Igor Grinbergdd2a2332011-11-07 01:14:07 +000068uchar env_get_char_spec(int index)
wdenk0bc4a1a2002-09-18 11:09:59 +000069{
70 uchar c;
Igor Grinbergdd2a2332011-11-07 01:14:07 +000071 unsigned int off = CONFIG_ENV_OFFSET;
Wolfgang Denkea882ba2010-06-20 23:33:59 +020072
Heiko Schocher1567b592010-01-07 08:55:44 +010073#ifdef CONFIG_ENV_OFFSET_REDUND
74 if (gd->env_valid == 2)
75 off = CONFIG_ENV_OFFSET_REDUND;
76#endif
Wolfgang Denkea882ba2010-06-20 23:33:59 +020077 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +000078 off + index + offsetof(env_t, data), &c, 1);
wdenk0bc4a1a2002-09-18 11:09:59 +000079
Igor Grinbergdd2a2332011-11-07 01:14:07 +000080 return c;
wdenk0bc4a1a2002-09-18 11:09:59 +000081}
82
Igor Grinbergdd2a2332011-11-07 01:14:07 +000083void env_relocate_spec(void)
wdenk0bc4a1a2002-09-18 11:09:59 +000084{
Tom Rinicd0f4fa2013-04-05 14:55:21 -040085 char buf[CONFIG_ENV_SIZE];
Heiko Schocher1567b592010-01-07 08:55:44 +010086 unsigned int off = CONFIG_ENV_OFFSET;
Wolfgang Denkea882ba2010-06-20 23:33:59 +020087
Heiko Schocher1567b592010-01-07 08:55:44 +010088#ifdef CONFIG_ENV_OFFSET_REDUND
89 if (gd->env_valid == 2)
90 off = CONFIG_ENV_OFFSET_REDUND;
91#endif
Wolfgang Denkea882ba2010-06-20 23:33:59 +020092 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +000093 off, (uchar *)buf, CONFIG_ENV_SIZE);
Wolfgang Denkea882ba2010-06-20 23:33:59 +020094
95 env_import(buf, 1);
wdenk0bc4a1a2002-09-18 11:09:59 +000096}
97
98int saveenv(void)
99{
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400100 env_t env_new;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000101 int rc;
102 unsigned int off = CONFIG_ENV_OFFSET;
Heiko Schocher1567b592010-01-07 08:55:44 +0100103#ifdef CONFIG_ENV_OFFSET_REDUND
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000104 unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
105 char flag_obsolete = OBSOLETE_FLAG;
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200106#endif
107
108 BUG_ON(env_ptr != NULL);
109
Marek Vasut7ce15262014-03-05 19:59:50 +0100110 rc = env_export(&env_new);
111 if (rc)
112 return rc;
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200113
114#ifdef CONFIG_ENV_OFFSET_REDUND
Heiko Schocher1567b592010-01-07 08:55:44 +0100115 if (gd->env_valid == 1) {
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000116 off = CONFIG_ENV_OFFSET_REDUND;
117 off_red = CONFIG_ENV_OFFSET;
Heiko Schocher1567b592010-01-07 08:55:44 +0100118 }
119
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400120 env_new.flags = ACTIVE_FLAG;
Heiko Schocher1567b592010-01-07 08:55:44 +0100121#endif
122
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200123 rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400124 off, (uchar *)&env_new, CONFIG_ENV_SIZE);
Heiko Schocher1567b592010-01-07 08:55:44 +0100125
126#ifdef CONFIG_ENV_OFFSET_REDUND
127 if (rc == 0) {
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200128 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000129 off_red + offsetof(env_t, flags),
130 (uchar *)&flag_obsolete, 1);
131
Heiko Schocher1567b592010-01-07 08:55:44 +0100132 if (gd->env_valid == 1)
133 gd->env_valid = 2;
134 else
135 gd->env_valid = 1;
Heiko Schocher1567b592010-01-07 08:55:44 +0100136 }
137#endif
Heiko Schocher1567b592010-01-07 08:55:44 +0100138 return rc;
wdenk0bc4a1a2002-09-18 11:09:59 +0000139}
140
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200141/*
wdenk0bc4a1a2002-09-18 11:09:59 +0000142 * Initialize Environment use
143 *
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200144 * We are still running from ROM, so data use is limited.
wdenk0bc4a1a2002-09-18 11:09:59 +0000145 * Use a (moderately small) buffer on the stack
146 */
Heiko Schocher1567b592010-01-07 08:55:44 +0100147#ifdef CONFIG_ENV_OFFSET_REDUND
148int env_init(void)
149{
Siva Durga Prasad Paladugued6a5d42014-05-26 19:51:22 +0530150#ifdef ENV_IS_EMBEDDED
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000151 ulong len, crc[2], crc_tmp;
Heiko Schocher1567b592010-01-07 08:55:44 +0100152 unsigned int off, off_env[2];
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000153 uchar buf[64], flags[2];
154 int i, crc_ok[2] = {0, 0};
Heiko Schocher1567b592010-01-07 08:55:44 +0100155
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200156 eeprom_init(); /* prepare for EEPROM read/write */
Heiko Schocher1567b592010-01-07 08:55:44 +0100157
158 off_env[0] = CONFIG_ENV_OFFSET;
159 off_env[1] = CONFIG_ENV_OFFSET_REDUND;
160
161 for (i = 0; i < 2; i++) {
162 /* read CRC */
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200163 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000164 off_env[i] + offsetof(env_t, crc),
165 (uchar *)&crc[i], sizeof(ulong));
Heiko Schocher1567b592010-01-07 08:55:44 +0100166 /* read FLAGS */
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200167 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000168 off_env[i] + offsetof(env_t, flags),
169 (uchar *)&flags[i], sizeof(uchar));
Heiko Schocher1567b592010-01-07 08:55:44 +0100170
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200171 crc_tmp = 0;
Heiko Schocher1567b592010-01-07 08:55:44 +0100172 len = ENV_SIZE;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000173 off = off_env[i] + offsetof(env_t, data);
Heiko Schocher1567b592010-01-07 08:55:44 +0100174 while (len > 0) {
175 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
176
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200177 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000178 buf, n);
Heiko Schocher1567b592010-01-07 08:55:44 +0100179
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200180 crc_tmp = crc32(crc_tmp, buf, n);
Heiko Schocher1567b592010-01-07 08:55:44 +0100181 len -= n;
182 off += n;
183 }
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000184
Heiko Schocher1567b592010-01-07 08:55:44 +0100185 if (crc_tmp == crc[i])
186 crc_ok[i] = 1;
187 }
188
189 if (!crc_ok[0] && !crc_ok[1]) {
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000190 gd->env_addr = 0;
191 gd->env_valid = 0;
Heiko Schocher1567b592010-01-07 08:55:44 +0100192
193 return 0;
194 } else if (crc_ok[0] && !crc_ok[1]) {
195 gd->env_valid = 1;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000196 } else if (!crc_ok[0] && crc_ok[1]) {
Heiko Schocher1567b592010-01-07 08:55:44 +0100197 gd->env_valid = 2;
198 } else {
199 /* both ok - check serial */
200 if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
201 gd->env_valid = 1;
202 else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
203 gd->env_valid = 2;
204 else if (flags[0] == 0xFF && flags[1] == 0)
205 gd->env_valid = 2;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000206 else if (flags[1] == 0xFF && flags[0] == 0)
Heiko Schocher1567b592010-01-07 08:55:44 +0100207 gd->env_valid = 1;
208 else /* flags are equal - almost impossible */
209 gd->env_valid = 1;
210 }
211
212 if (gd->env_valid == 2)
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000213 gd->env_addr = off_env[1] + offsetof(env_t, data);
Heiko Schocher1567b592010-01-07 08:55:44 +0100214 else if (gd->env_valid == 1)
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000215 gd->env_addr = off_env[0] + offsetof(env_t, data);
Siva Durga Prasad Paladugued6a5d42014-05-26 19:51:22 +0530216#else
217 gd->env_addr = (ulong)&default_environment[0];
218 gd->env_valid = 1;
219#endif
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000220 return 0;
Heiko Schocher1567b592010-01-07 08:55:44 +0100221}
222#else
wdenk0bc4a1a2002-09-18 11:09:59 +0000223int env_init(void)
224{
Siva Durga Prasad Paladugued6a5d42014-05-26 19:51:22 +0530225#ifdef ENV_IS_EMBEDDED
wdenk0bc4a1a2002-09-18 11:09:59 +0000226 ulong crc, len, new;
227 unsigned off;
228 uchar buf[64];
229
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200230 eeprom_init(); /* prepare for EEPROM read/write */
wdenk0bc4a1a2002-09-18 11:09:59 +0000231
232 /* read old CRC */
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200233 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000234 CONFIG_ENV_OFFSET + offsetof(env_t, crc),
235 (uchar *)&crc, sizeof(ulong));
wdenk0bc4a1a2002-09-18 11:09:59 +0000236
237 new = 0;
238 len = ENV_SIZE;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000239 off = offsetof(env_t, data);
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200240
wdenk0bc4a1a2002-09-18 11:09:59 +0000241 while (len > 0) {
242 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
243
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200244 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
Heiko Schocher548738b2010-01-07 08:55:40 +0100245 CONFIG_ENV_OFFSET + off, buf, n);
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200246 new = crc32(new, buf, n);
wdenk0bc4a1a2002-09-18 11:09:59 +0000247 len -= n;
248 off += n;
249 }
250
251 if (crc == new) {
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000252 gd->env_addr = offsetof(env_t, data);
253 gd->env_valid = 1;
wdenk0bc4a1a2002-09-18 11:09:59 +0000254 } else {
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000255 gd->env_addr = 0;
256 gd->env_valid = 0;
wdenk0bc4a1a2002-09-18 11:09:59 +0000257 }
Siva Durga Prasad Paladugued6a5d42014-05-26 19:51:22 +0530258#else
259 gd->env_addr = (ulong)&default_environment[0];
260 gd->env_valid = 1;
261#endif
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000262 return 0;
wdenk0bc4a1a2002-09-18 11:09:59 +0000263}
Heiko Schocher1567b592010-01-07 08:55:44 +0100264#endif