diff options
Diffstat (limited to 'env/eeprom.c')
| -rw-r--r-- | env/eeprom.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/env/eeprom.c b/env/eeprom.c new file mode 100644 index 0000000000..5f63a6cd4a --- /dev/null +++ b/env/eeprom.c @@ -0,0 +1,245 @@ +/* + * (C) Copyright 2000-2010 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Andreas Heppel <aheppel@sysgo.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> +#include <environment.h> +#include <linux/stddef.h> +#if defined(CONFIG_I2C_ENV_EEPROM_BUS) +#include <i2c.h> +#endif +#include <search.h> +#include <errno.h> +#include <linux/compiler.h> /* for BUG_ON */ + +DECLARE_GLOBAL_DATA_PTR; + +env_t *env_ptr; + +char *env_name_spec = "EEPROM"; + +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 (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) + i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); +#endif + + rcode = eeprom_read(dev_addr, offset, buffer, cnt); + +#if defined(CONFIG_I2C_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(); + + if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) + i2c_set_bus_num(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 = 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) +{ + char buf_env[CONFIG_ENV_SIZE]; + unsigned int off = CONFIG_ENV_OFFSET; + +#ifdef CONFIG_ENV_OFFSET_REDUND + ulong len, crc[2], crc_tmp; + unsigned int off_env[2]; + uchar rdbuf[64], flags[2]; + int i, crc_ok[2] = {0, 0}; + + eeprom_init(-1); /* 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(rdbuf)) ? sizeof(rdbuf) : len; + + eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, + rdbuf, n); + + crc_tmp = crc32(crc_tmp, rdbuf, 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; + } 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; + } + +#else /* CONFIG_ENV_OFFSET_REDUND */ + ulong crc, len, new; + uchar rdbuf[64]; + + eeprom_init(-1); /* 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(rdbuf)) ? sizeof(rdbuf) : len; + + eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, + CONFIG_ENV_OFFSET + off, rdbuf, n); + new = crc32(new, rdbuf, n); + len -= n; + off += n; + } + + if (crc == new) { + gd->env_valid = 1; + } else { + gd->env_valid = 0; + } +#endif /* CONFIG_ENV_OFFSET_REDUND */ + + 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 *)buf_env, CONFIG_ENV_SIZE); + + env_import(buf_env, 1); +} + +int saveenv(void) +{ + env_t env_new; + 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; +#endif + + BUG_ON(env_ptr != NULL); + + rc = env_export(&env_new); + if (rc) + return rc; + +#ifdef CONFIG_ENV_OFFSET_REDUND + if (gd->env_valid == 1) { + off = CONFIG_ENV_OFFSET_REDUND; + off_red = CONFIG_ENV_OFFSET; + } + + env_new.flags = ACTIVE_FLAG; +#endif + + rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, + off, (uchar *)&env_new, 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 + */ +int env_init(void) +{ + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = 1; + return 0; +} |