diff options
Diffstat (limited to 'u-boot/common/env_eeprom.c')
| -rw-r--r-- | u-boot/common/env_eeprom.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/u-boot/common/env_eeprom.c b/u-boot/common/env_eeprom.c new file mode 100644 index 0000000..0a179ad --- /dev/null +++ b/u-boot/common/env_eeprom.c @@ -0,0 +1,303 @@ +/* + * (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> + * + * 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 +#include <search.h> +#include <errno.h> +#include <linux/compiler.h> /* for BUG_ON */ + +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) +{ + char buf[CONFIG_ENV_SIZE]; + 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 *)buf, + CONFIG_ENV_SIZE); + + env_import(buf, 1); +} + +int saveenv(void) +{ + env_t env_new; + ssize_t len; + char *res; + 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); + + res = (char *)&env_new.data; + len = hexport_r(&env_htab, '\0', &res, ENV_SIZE); + if (len < 0) { + error("Cannot export environment: errno = %d\n", errno); + return 1; + } + env_new.crc = crc32(0, env_new.data, ENV_SIZE); + +#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 + */ + +#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 |