--- /dev/null
+/*
+ * (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[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;
+ 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
+ */
+#ifdef CONFIG_ENV_OFFSET_REDUND
+int env_init(void)
+{
+ ulong len, crc[2], crc_tmp;
+ unsigned int off, off_env[2];
+ uchar buf[64], flags[2];
+ int i, crc_ok[2] = {0, 0};
+
+ 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
Code Review / kvmfornfv.git / blobdiff