fconf: Add Secure Partitions information as property

Use the firmware configuration framework to retrieve information about
Secure Partitions to facilitate loading them into memory.

To load a SP image we need UUID look-up into FIP and the load address
where it needs to be loaded in memory.

This patch introduces a SP populator function which gets UUID and load
address from firmware config device tree and updates its C data
structure.

Change-Id: I17faec41803df9a76712dcc8b67cadb1c9daf8cd
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>

include/export/common/tbbr/tbbr_img_def_exp.h

@@ -86,6 +86,11 @@
 #define STM32_IMAGE_ID			U(29)
 
 /* Define size of the array */
+#if defined(SPD_spmd)
+#define MAX_SP_IDS			U(8)
+#define MAX_NUMBER_IDS			MAX_SP_IDS + U(30)
+#else
 #define MAX_NUMBER_IDS			U(30)
+#endif
 
 #endif /* ARM_TRUSTED_FIRMWARE_EXPORT_COMMON_TBBR_TBBR_IMG_DEF_EXP_H */

include/plat/arm/common/fconf_arm_sp_getter.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef FCONF_ARM_SP_GETTER_H
+#define FCONF_ARM_SP_GETTER_H
+
+#include <lib/fconf/fconf.h>
+#include <tools_share/uuid.h>
+
+/* arm_sp getter */
+#define arm__sp_getter(prop)	arm_sp.prop
+
+struct arm_sp_t {
+	unsigned int		number_of_sp;
+	union uuid_helper_t	uuids[MAX_SP_IDS];
+	uintptr_t		load_addr[MAX_SP_IDS];
+};
+
+int fconf_populate_arm_sp(uintptr_t config);
+
+extern struct arm_sp_t arm_sp;
+
+#endif /* FCONF_ARM_SP_GETTER_H */

plat/arm/common/arm_common.mk

@@ -182,6 +182,9 @@ ARM_IO_SOURCES		+=	plat/arm/common/arm_io_storage.c
 else
 ARM_IO_SOURCES		+=	plat/arm/common/arm_fconf_io_storage.c		\
 				plat/arm/common/fconf/arm_fconf_io.c
+ifeq (${SPD},spmd)
+ARM_IO_SOURCES		+=	plat/arm/common/fconf/arm_fconf_sp.c
+endif
 endif
 
 BL1_SOURCES		+=	drivers/io/io_fip.c				\

plat/arm/common/fconf/arm_fconf_sp.c

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <drivers/io/io_storage.h>
+#include <lib/object_pool.h>
+#include <libfdt.h>
+#include <plat/arm/common/arm_fconf_getter.h>
+#include <plat/arm/common/arm_fconf_io_storage.h>
+#include <plat/arm/common/fconf_arm_sp_getter.h>
+#include <platform_def.h>
+#include <tools_share/firmware_image_package.h>
+
+#ifdef IMAGE_BL2
+
+struct arm_sp_t arm_sp;
+
+int fconf_populate_arm_sp(uintptr_t config)
+{
+	int sp_node, node, err;
+	union uuid_helper_t uuid_helper;
+
+	/* As libfdt use void *, we can't avoid this cast */
+	const void *dtb = (void *)config;
+
+	/* Assert the node offset point to "arm,sp" compatible property */
+	const char *compatible_str = "arm,sp";
+
+	node = fdt_node_offset_by_compatible(dtb, -1, compatible_str);
+	if (node < 0) {
+		ERROR("FCONF: Can't find %s in dtb\n", compatible_str);
+		return node;
+	}
+
+	fdt_for_each_subnode(sp_node, dtb, node) {
+		err = fdtw_read_array(dtb, sp_node, "uuid", 4,
+				      &uuid_helper.word);
+		if (err < 0) {
+			ERROR("FCONF: cannot read SP uuid\n");
+			return -1;
+		}
+
+		arm_sp.uuids[arm_sp.number_of_sp] = uuid_helper;
+
+		err = fdtw_read_cells(dtb, sp_node, "load-address", 1,
+			&arm_sp.load_addr[arm_sp.number_of_sp]);
+		if (err < 0) {
+			ERROR("FCONF: cannot read SP load address\n");
+			return -1;
+		}
+
+		VERBOSE("FCONF: %s UUID %x-%x-%x-%x load_addr=%lx\n",
+			__func__,
+			uuid_helper.word[0],
+			uuid_helper.word[1],
+			uuid_helper.word[2],
+			uuid_helper.word[3],
+			arm_sp.load_addr[arm_sp.number_of_sp]);
+
+		arm_sp.number_of_sp++;
+
+		if (arm_sp.number_of_sp >= MAX_SP_IDS) {
+			ERROR("FCONF: reached max number of SPs\n");
+			return -1;
+		}
+	}
+
+	if ((sp_node < 0) && (sp_node != -FDT_ERR_NOTFOUND)) {
+		ERROR("%d: fdt_for_each_subnode(): %d\n", __LINE__, node);
+		return sp_node;
+	}
+
+	return 0;
+}
+
+FCONF_REGISTER_POPULATOR(arm_sp, fconf_populate_arm_sp);
+
+#endif /* IMAGE_BL2 */