[opensbi] create opensbi from T-Head official:

repo: https://github.com/T-head-Semi/opensbi
	commit: 89182b257c8798e15e4c685c1af0c2862d528d2a

Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea

opensbi/lib/utils/timer/fdt_timer.c

@@ -0,0 +1,81 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi/sbi_scratch.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/timer/fdt_timer.h>
+
+extern struct fdt_timer fdt_timer_clint;
+
+static struct fdt_timer *timer_drivers[] = {
+	&fdt_timer_clint
+};
+
+static struct fdt_timer dummy = {
+	.match_table = NULL,
+	.cold_init = NULL,
+	.warm_init = NULL,
+	.exit = NULL,
+};
+
+static struct fdt_timer *current_driver = &dummy;
+
+void fdt_timer_exit(void)
+{
+	if (current_driver->exit)
+		current_driver->exit();
+}
+
+static int fdt_timer_warm_init(void)
+{
+	if (current_driver->warm_init)
+		return current_driver->warm_init();
+	return 0;
+}
+
+static int fdt_timer_cold_init(void)
+{
+	int pos, noff, rc;
+	struct fdt_timer *drv;
+	const struct fdt_match *match;
+	void *fdt = sbi_scratch_thishart_arg1_ptr();
+
+	for (pos = 0; pos < array_size(timer_drivers); pos++) {
+		drv = timer_drivers[pos];
+
+		noff = -1;
+		while ((noff = fdt_find_match(fdt, noff,
+					drv->match_table, &match)) >= 0) {
+			if (drv->cold_init) {
+				rc = drv->cold_init(fdt, noff, match);
+				if (rc)
+					return rc;
+			}
+			current_driver = drv;
+		}
+
+		if (current_driver != &dummy)
+			break;
+	}
+
+	return 0;
+}
+
+int fdt_timer_init(bool cold_boot)
+{
+	int rc;
+
+	if (cold_boot) {
+		rc = fdt_timer_cold_init();
+		if (rc)
+			return rc;
+	}
+
+	return fdt_timer_warm_init();
+}