1 files changed, 75 insertions, 0 deletions
diff --git a/env/dataflash.c b/env/dataflash.c
new file mode 100644
index 0000000000..77bc595e0d
--- /dev/null
+++ b/env/dataflash.c
@@ -0,0 +1,75 @@
+/*
+ * LowLevel function for DataFlash environment support
+ * Author : Gilles Gastaldi (Atmel)
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <dataflash.h>
+#include <search.h>
+#include <errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int env_dataflash_get_char(int index)
+{
+	uchar c;
+
+	read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
+			1, (char *)&c);
+	return c;
+}
+
+static int env_dataflash_load(void)
+{
+	ulong crc, new = 0;
+	unsigned off;
+	char buf[CONFIG_ENV_SIZE];
+
+	/* Read old CRC */
+	read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
+		       sizeof(ulong), (char *)&crc);
+
+	/* Read whole environment */
+	read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
+
+	/* Calculate the CRC */
+	off = offsetof(env_t, data);
+	new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
+
+	if (crc == new)
+		env_import(buf, 1);
+	else
+		set_default_env("!bad CRC");
+
+	return 0;
+}
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+#error No support for redundant environment on dataflash yet!
+#endif
+
+static int env_dataflash_save(void)
+{
+	env_t env_new;
+	int ret;
+
+	ret = env_export(&env_new);
+	if (ret)
+		return ret;
+
+	return write_dataflash(CONFIG_ENV_ADDR,
+				(unsigned long)&env_new,
+				CONFIG_ENV_SIZE);
+}
+
+U_BOOT_ENV_LOCATION(dataflash) = {
+	.location	= ENVL_DATAFLASH,
+	ENV_NAME("dataflash")
+	.get_char	= env_dataflash_get_char,
+	.load		= env_dataflash_load,
+	.save		= env_save_ptr(env_dataflash_save),
+};