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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{
Ludger Dreiere3cc5bc2015-10-12 13:34:24 +020085 char buf_env[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
Ludger Dreiere3cc5bc2015-10-12 13:34:24 +020089 ulong len, crc[2], crc_tmp;
90 unsigned int off_env[2];
91 uchar rdbuf[64], flags[2];
92 int i, crc_ok[2] = {0, 0};
93
94 eeprom_init(); /* prepare for EEPROM read/write */
95
96 off_env[0] = CONFIG_ENV_OFFSET;
97 off_env[1] = CONFIG_ENV_OFFSET_REDUND;
98
99 for (i = 0; i < 2; i++) {
100 /* read CRC */
101 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
102 off_env[i] + offsetof(env_t, crc),
103 (uchar *)&crc[i], sizeof(ulong));
104 /* read FLAGS */
105 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
106 off_env[i] + offsetof(env_t, flags),
107 (uchar *)&flags[i], sizeof(uchar));
108
109 crc_tmp = 0;
110 len = ENV_SIZE;
111 off = off_env[i] + offsetof(env_t, data);
112 while (len > 0) {
113 int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
114
115 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
116 rdbuf, n);
117
118 crc_tmp = crc32(crc_tmp, rdbuf, n);
119 len -= n;
120 off += n;
121 }
122
123 if (crc_tmp == crc[i])
124 crc_ok[i] = 1;
125 }
126
127 if (!crc_ok[0] && !crc_ok[1]) {
128 gd->env_addr = 0;
129 gd->env_valid = 0;
130 } else if (crc_ok[0] && !crc_ok[1]) {
131 gd->env_valid = 1;
132 } else if (!crc_ok[0] && crc_ok[1]) {
133 gd->env_valid = 2;
134 } else {
135 /* both ok - check serial */
136 if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
137 gd->env_valid = 1;
138 else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
139 gd->env_valid = 2;
140 else if (flags[0] == 0xFF && flags[1] == 0)
141 gd->env_valid = 2;
142 else if (flags[1] == 0xFF && flags[0] == 0)
143 gd->env_valid = 1;
144 else /* flags are equal - almost impossible */
145 gd->env_valid = 1;
146 }
147
148 if (gd->env_valid == 2)
149 gd->env_addr = off_env[1] + offsetof(env_t, data);
150 else if (gd->env_valid == 1)
151 gd->env_addr = off_env[0] + offsetof(env_t, data);
152
153#else /* CONFIG_ENV_OFFSET_REDUND */
154 ulong crc, len, new;
155 uchar rdbuf[64];
156
157 eeprom_init(); /* prepare for EEPROM read/write */
158
159 /* read old CRC */
160 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
161 CONFIG_ENV_OFFSET + offsetof(env_t, crc),
162 (uchar *)&crc, sizeof(ulong));
163
164 new = 0;
165 len = ENV_SIZE;
166 off = offsetof(env_t, data);
167 while (len > 0) {
168 int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
169
170 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
171 CONFIG_ENV_OFFSET + off, rdbuf, n);
172 new = crc32(new, rdbuf, n);
173 len -= n;
174 off += n;
175 }
176
177 if (crc == new) {
178 gd->env_addr = offsetof(env_t, data);
179 gd->env_valid = 1;
180 } else {
181 gd->env_addr = 0;
182 gd->env_valid = 0;
183 }
184#endif /* CONFIG_ENV_OFFSET_REDUND */
185
186 off = CONFIG_ENV_OFFSET;
187#ifdef CONFIG_ENV_OFFSET_REDUND
Heiko Schocher1567b592010-01-07 08:55:44 +0100188 if (gd->env_valid == 2)
189 off = CONFIG_ENV_OFFSET_REDUND;
190#endif
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200191
Ludger Dreiere3cc5bc2015-10-12 13:34:24 +0200192 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
193 off, (uchar *)buf_env, CONFIG_ENV_SIZE);
194
195 env_import(buf_env, 1);
wdenk0bc4a1a2002-09-18 11:09:59 +0000196}
197
198int saveenv(void)
199{
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400200 env_t env_new;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000201 int rc;
202 unsigned int off = CONFIG_ENV_OFFSET;
Heiko Schocher1567b592010-01-07 08:55:44 +0100203#ifdef CONFIG_ENV_OFFSET_REDUND
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000204 unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
205 char flag_obsolete = OBSOLETE_FLAG;
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200206#endif
207
208 BUG_ON(env_ptr != NULL);
209
Marek Vasut7ce15262014-03-05 19:59:50 +0100210 rc = env_export(&env_new);
211 if (rc)
212 return rc;
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200213
214#ifdef CONFIG_ENV_OFFSET_REDUND
Heiko Schocher1567b592010-01-07 08:55:44 +0100215 if (gd->env_valid == 1) {
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000216 off = CONFIG_ENV_OFFSET_REDUND;
217 off_red = CONFIG_ENV_OFFSET;
Heiko Schocher1567b592010-01-07 08:55:44 +0100218 }
219
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400220 env_new.flags = ACTIVE_FLAG;
Heiko Schocher1567b592010-01-07 08:55:44 +0100221#endif
222
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200223 rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400224 off, (uchar *)&env_new, CONFIG_ENV_SIZE);
Heiko Schocher1567b592010-01-07 08:55:44 +0100225
226#ifdef CONFIG_ENV_OFFSET_REDUND
227 if (rc == 0) {
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200228 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000229 off_red + offsetof(env_t, flags),
230 (uchar *)&flag_obsolete, 1);
231
Heiko Schocher1567b592010-01-07 08:55:44 +0100232 if (gd->env_valid == 1)
233 gd->env_valid = 2;
234 else
235 gd->env_valid = 1;
Heiko Schocher1567b592010-01-07 08:55:44 +0100236 }
237#endif
Heiko Schocher1567b592010-01-07 08:55:44 +0100238 return rc;
wdenk0bc4a1a2002-09-18 11:09:59 +0000239}
240
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200241/*
wdenk0bc4a1a2002-09-18 11:09:59 +0000242 * Initialize Environment use
243 *
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200244 * We are still running from ROM, so data use is limited.
wdenk0bc4a1a2002-09-18 11:09:59 +0000245 * Use a (moderately small) buffer on the stack
246 */
Heiko Schocher1567b592010-01-07 08:55:44 +0100247int env_init(void)
248{
Siva Durga Prasad Paladugued6a5d42014-05-26 19:51:22 +0530249 gd->env_addr = (ulong)&default_environment[0];
250 gd->env_valid = 1;
Igor Grinbergdd2a2332011-11-07 01:14:07 +0000251 return 0;
Heiko Schocher1567b592010-01-07 08:55:44 +0100252}