sgi/dyncfg: add system-id node in hw-config dtb

Append a node to hw-config dtb which will include a property to hold
the value of the SSC_VERSION register. This will be used by the BL33
stage to determine the platform-id and the config-id of the platform
it is executing on.

Change-Id: Ie7b1e5d8c1bbe0efdb7ef0714f14b7794ec6058e
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

plat/arm/css/sgi/sgi-common.mk

@@ -30,7 +30,8 @@ BL1_SOURCES		+=	${INTERCONNECT_SOURCES}			\
 				${CSS_ENT_BASE}/sgi_bl1_setup.c	\
 				${CSS_ENT_BASE}/sgi_plat_config.c
 
-BL2_SOURCES		+=	${CSS_ENT_BASE}/sgi_security.c
+BL2_SOURCES		+=	${CSS_ENT_BASE}/sgi_security.c		\
+				${CSS_ENT_BASE}/sgi_image_load.c
 
 BL31_SOURCES		+=	${ENT_CPU_SOURCES}			\
 				${INTERCONNECT_SOURCES}			\

plat/arm/css/sgi/sgi_image_load.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <debug.h>
+#include <desc_image_load.h>
+#include <libfdt.h>
+#include <platform.h>
+
+/*******************************************************************************
+ * This function inserts Platform information via device tree nodes as,
+ * system-id {
+ *    platform-id = <0>;
+ * }
+ ******************************************************************************/
+static int plat_sgi_append_config_node(void)
+{
+	bl_mem_params_node_t *mem_params;
+	void *fdt;
+	int nodeoffset, err;
+	unsigned int platid = 0;
+	char *platform_name;
+
+	mem_params = get_bl_mem_params_node(HW_CONFIG_ID);
+	if (mem_params == NULL) {
+		ERROR("HW CONFIG base address is NULL");
+		return -1;
+	}
+
+	fdt = (void *)(mem_params->image_info.image_base);
+
+	/* Check the validity of the fdt */
+	if (fdt_check_header(fdt) != 0) {
+		ERROR("Invalid HW_CONFIG DTB passed\n");
+		return -1;
+	}
+
+	platform_name = (char *)fdt_getprop(fdt, 0, "compatible", NULL);
+
+	if (strcmp(platform_name, "arm,sgi575") == 0) {
+		platid = mmio_read_32(SSC_VERSION);
+	} else {
+		WARN("Invalid platform \n");
+		return -1;
+	}
+
+	/* Increase DTB blob by 512 byte */
+	err = fdt_open_into(fdt, fdt, mem_params->image_info.image_size + 512);
+	if (err < 0) {
+		ERROR("Failed to open HW_CONFIG DTB\n");
+		return -1;
+	}
+
+	/* Create "/system-id" node */
+	nodeoffset = fdt_add_subnode(fdt, 0, "system-id");
+	if (nodeoffset < 0) {
+		ERROR("Failed to add node system-id\n");
+		return -1;
+	}
+
+	err = fdt_setprop_u32(fdt, nodeoffset, "platform-id", platid);
+	if (err < 0) {
+		ERROR("Failed to add node platform-id\n");
+		return -1;
+	}
+	return 0;
+}
+
+/*******************************************************************************
+ * This function returns the list of executable images.
+ ******************************************************************************/
+bl_params_t *plat_get_next_bl_params(void)
+{
+	int ret;
+	bl_params_t *next_bl_params;
+
+	ret = plat_sgi_append_config_node();
+	if (ret != 0)
+		panic();
+
+	next_bl_params = get_next_bl_params_from_mem_params_desc();
+	populate_next_bl_params_config(next_bl_params);
+
+	return next_bl_params;
+}