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common/env_eeprom.c
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/* |
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* (C) Copyright 2000-2010 |
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Andreas Heppel <aheppel@sysgo.de> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ #include <common.h> |
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#include <command.h> #include <environment.h> |
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#include <linux/stddef.h> |
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS) #include <i2c.h> #endif |
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#include <search.h> #include <errno.h> #include <linux/compiler.h> /* for BUG_ON */ |
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DECLARE_GLOBAL_DATA_PTR; |
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env_t *env_ptr; |
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char *env_name_spec = "EEPROM"; |
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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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{ int rcode; #if defined(CONFIG_I2C_ENV_EEPROM_BUS) int old_bus = i2c_get_bus_num(); |
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) 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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static int eeprom_bus_write(unsigned dev_addr, unsigned offset, |
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uchar *buffer, unsigned cnt) |
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{ int rcode; #if defined(CONFIG_I2C_ENV_EEPROM_BUS) int old_bus = i2c_get_bus_num(); |
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) 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) i2c_set_bus_num(old_bus); #endif |
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return rcode; } |
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uchar env_get_char_spec(int index) |
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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 if (gd->env_valid == 2) off = CONFIG_ENV_OFFSET_REDUND; #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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void env_relocate_spec(void) |
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{ |
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char buf[CONFIG_ENV_SIZE]; |
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unsigned int off = CONFIG_ENV_OFFSET; |
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#ifdef CONFIG_ENV_OFFSET_REDUND if (gd->env_valid == 2) off = CONFIG_ENV_OFFSET_REDUND; #endif |
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
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off, (uchar *)buf, CONFIG_ENV_SIZE); |
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env_import(buf, 1); |
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} int saveenv(void) { |
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env_t env_new; |
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ssize_t len; char *res; |
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int rc; 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; char flag_obsolete = OBSOLETE_FLAG; |
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#endif BUG_ON(env_ptr != NULL); |
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res = (char *)&env_new.data; |
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len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL); |
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if (len < 0) { error("Cannot export environment: errno = %d ", errno); return 1; } |
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env_new.crc = crc32(0, env_new.data, ENV_SIZE); |
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#ifdef CONFIG_ENV_OFFSET_REDUND |
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if (gd->env_valid == 1) { |
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off = CONFIG_ENV_OFFSET_REDUND; off_red = CONFIG_ENV_OFFSET; |
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} |
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env_new.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, (uchar *)&env_new, CONFIG_ENV_SIZE); |
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#ifdef CONFIG_ENV_OFFSET_REDUND 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), (uchar *)&flag_obsolete, 1); |
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if (gd->env_valid == 1) gd->env_valid = 2; else gd->env_valid = 1; |
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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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* 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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#ifdef CONFIG_ENV_OFFSET_REDUND int env_init(void) { |
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ulong len, crc[2], crc_tmp; |
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unsigned int off, off_env[2]; |
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uchar buf[64], flags[2]; int i, crc_ok[2] = {0, 0}; |
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eeprom_init(); /* prepare for EEPROM read/write */ |
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off_env[0] = CONFIG_ENV_OFFSET; off_env[1] = CONFIG_ENV_OFFSET_REDUND; for (i = 0; i < 2; i++) { /* 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), (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), (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) { 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; off += n; } |
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if (crc_tmp == crc[i]) crc_ok[i] = 1; } if (!crc_ok[0] && !crc_ok[1]) { |
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gd->env_addr = 0; gd->env_valid = 0; |
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return 0; } else if (crc_ok[0] && !crc_ok[1]) { gd->env_valid = 1; |
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} else if (!crc_ok[0] && crc_ok[1]) { |
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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; |
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else if (flags[1] == 0xFF && flags[0] == 0) |
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gd->env_valid = 1; else /* flags are equal - almost impossible */ gd->env_valid = 1; } 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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} #else |
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int env_init(void) { |
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ulong crc, len, new; unsigned off; 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), (uchar *)&crc, sizeof(ulong)); |
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new = 0; len = ENV_SIZE; |
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off = offsetof(env_t, data); |
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while (len > 0) { 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; off += n; } if (crc == new) { |
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gd->env_addr = offsetof(env_t, data); gd->env_valid = 1; |
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} else { |
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gd->env_addr = 0; gd->env_valid = 0; |
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} |
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return 0; |
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} |
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#endif |