fconf: Add TBBR disable_authentication property

Use fconf to retrieve the `disable_authentication` property.
Move this access from arm dynamic configuration to bl common.

Change-Id: Ibf184a5c6245d04839222f5457cf5e651f252b86
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/fconf/fconf_tbbr_getter.c b/lib/fconf/fconf_tbbr_getter.c
new file mode 100644
index 000000000..29f67caec
--- /dev/null
+++ b/lib/fconf/fconf_tbbr_getter.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2019-2020, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <assert.h>
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <lib/fconf/fconf_tbbr_getter.h>
+#include <libfdt.h>
+
+struct tbbr_dyn_config_t tbbr_dyn_config;
+
+int fconf_populate_tbbr_dyn_config(uintptr_t config)
+{
+	int err;
+	int node;
+
+	/* As libfdt use void *, we can't avoid this cast */
+	const void *dtb = (void *)config;
+
+	/* Assert the node offset point to "arm,tb_fw" compatible property */
+	const char *compatible_str = "arm,tb_fw";
+	node = fdt_node_offset_by_compatible(dtb, -1, compatible_str);
+	if (node < 0) {
+		ERROR("FCONF: Can't find %s compatible in dtb\n", compatible_str);
+		return node;
+	}
+
+	/* Locate the disable_auth cell and read the value */
+	err = fdtw_read_cells(dtb, node, "disable_auth", 1, &tbbr_dyn_config.disable_auth);
+	if (err < 0) {
+		WARN("FCONF: Read cell failed for `disable_auth`\n");
+		return err;
+	}
+
+	/* Check if the value is boolean */
+	if ((tbbr_dyn_config.disable_auth != 0U) && (tbbr_dyn_config.disable_auth != 1U)) {
+		WARN("Invalid value for `disable_auth` cell %d\n", tbbr_dyn_config.disable_auth);
+		return -1;
+	}
+
+#if defined(DYN_DISABLE_AUTH)
+	if (tbbr_dyn_config.disable_auth == 1)
+		dyn_disable_auth();
+#endif
+
+	VERBOSE("FCONF:tbbr.disable_auth cell found with value = %d\n",
+					tbbr_dyn_config.disable_auth);
+
+	return 0;
+}
+
+FCONF_REGISTER_POPULATOR(tbbr, fconf_populate_tbbr_dyn_config);