Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 241 insertions, 0 deletions

diff --git a/roms/u-boot/env/eeprom.c b/roms/u-boot/env/eeprom.c
new file mode 100644
index 000000000..ba168014e
--- /dev/null
+++ b/roms/u-boot/env/eeprom.c
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (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>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <eeprom.h>
+#include <env.h>
+#include <env_internal.h>
+#include <asm/global_data.h>
+#include <linux/stddef.h>
+#include <u-boot/crc.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;
+
+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;
+}
+
+/** Call this function from overridden env_get_char_spec() if you need
+ * this functionality.
+ */
+int env_eeprom_get_char(int index)
+{
+	uchar c;
+	unsigned int off = CONFIG_ENV_OFFSET;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_REDUND)
+		off = CONFIG_ENV_OFFSET_REDUND;
+#endif
+	eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+			off + index + offsetof(env_t, data), &c, 1);
+
+	return c;
+}
+
+static int env_eeprom_load(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 = ENV_INVALID;
+	} else if (crc_ok[0] && !crc_ok[1]) {
+		gd->env_valid = ENV_VALID;
+	} else if (!crc_ok[0] && crc_ok[1]) {
+		gd->env_valid = ENV_REDUND;
+	} else {
+		/* both ok - check serial */
+		if (flags[0] == ENV_REDUND_ACTIVE &&
+		    flags[1] == ENV_REDUND_OBSOLETE)
+			gd->env_valid = ENV_VALID;
+		else if (flags[0] == ENV_REDUND_OBSOLETE &&
+			 flags[1] == ENV_REDUND_ACTIVE)
+			gd->env_valid = ENV_REDUND;
+		else if (flags[0] == 0xFF && flags[1] == 0)
+			gd->env_valid = ENV_REDUND;
+		else if (flags[1] == 0xFF && flags[0] == 0)
+			gd->env_valid = ENV_VALID;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = ENV_VALID;
+	}
+
+#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 = ENV_VALID;
+	} else {
+		gd->env_valid = ENV_INVALID;
+	}
+#endif /* CONFIG_ENV_OFFSET_REDUND */
+
+	off = CONFIG_ENV_OFFSET;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_REDUND)
+		off = CONFIG_ENV_OFFSET_REDUND;
+#endif
+
+	eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+		off, (uchar *)buf_env, CONFIG_ENV_SIZE);
+
+	return env_import(buf_env, 1, H_EXTERNAL);
+}
+
+static int env_eeprom_save(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	= ENV_REDUND_OBSOLETE;
+#endif
+
+	rc = env_export(&env_new);
+	if (rc)
+		return rc;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_VALID) {
+		off	= CONFIG_ENV_OFFSET_REDUND;
+		off_red	= CONFIG_ENV_OFFSET;
+	}
+
+	env_new.flags = ENV_REDUND_ACTIVE;
+#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 == ENV_VALID)
+			gd->env_valid = ENV_REDUND;
+		else
+			gd->env_valid = ENV_VALID;
+	}
+#endif
+	return rc;
+}
+
+U_BOOT_ENV_LOCATION(eeprom) = {
+	.location	= ENVL_EEPROM,
+	ENV_NAME("EEPROM")
+	.load		= env_eeprom_load,
+	.save		= env_save_ptr(env_eeprom_save),
+};