ARM Platforms: Load HW_CONFIG in BL2

The patch adds the necessary changes to load HW_CONFIG in BL2 for
ARM Platforms :

1. The load address of HW_CONFIG is specified via the `hw_config_addr`
property in TB_FW_CONFIG is loaded by BL1. The `hw_config_max_size`
property defines the maximum size to be expected for the HW_CONFIG.
The `arm_dyn_cfg_helpers.c` and corresponding header implements
utility functions to parse these DT properties defined.
The `arm_dyn_cfg.c` implements wrappers to these helpers to enable
them to be invoked from ARM platform layer.

2. `HW_CONFIG` is added to the `bl2_mem_params_descs[]` array which is
the list of images to be loaded by BL2.

3. The `libfdt` sources are now included when BL2 is built

4. A new helper `populate_next_bl_params_config()` is introduced in
desc_image_load.c to populate the subsequent executable BL images
with the `hw_config` and the corresponding `fw_config` if available.
The `plat_get_next_bl_params()` API for ARM platforms is modified to
invoke this new helper.

5. The implementation of `bl2_early_platform_setup2()` is modified to
consider `arg0` as well in addition to `arg1` passed from BL1.

6. Bump up the BL2 size for Juno to accommodate the inclusion of libfdt.

Change-Id: I80f1554adec41753e0d179a5237364f04fe13a3f
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

4 files changed, 22 insertions, 3 deletions

diff --git a/include/common/desc_image_load.h b/include/common/desc_image_load.h
index 79f2bd7b..f183db50 100644
--- a/include/common/desc_image_load.h
+++ b/include/common/desc_image_load.h
@@ -33,7 +33,7 @@ int get_bl_params_node_index(unsigned int image_id);
 bl_mem_params_node_t *get_bl_mem_params_node(unsigned int image_id);
 bl_load_info_t *get_bl_load_info_from_mem_params_desc(void);
 bl_params_t *get_next_bl_params_from_mem_params_desc(void);
-
+void populate_next_bl_params_config(bl_params_t *bl2_to_next_bl_params);
 
 #endif /* LOAD_IMAGE_V2 */
 #endif /* __DESC_IMAGE_LOAD_H__ */
diff --git a/include/plat/arm/board/common/board_arm_def.h b/include/plat/arm/board/common/board_arm_def.h
index 888629e3..12a21fb7 100644
--- a/include/plat/arm/board/common/board_arm_def.h
+++ b/include/plat/arm/board/common/board_arm_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/include/plat/arm/common/arm_dyn_cfg_helpers.h b/include/plat/arm/common/arm_dyn_cfg_helpers.h
new file mode 100644
index 00000000..4a0f6397
--- /dev/null
+++ b/include/plat/arm/common/arm_dyn_cfg_helpers.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __ARM_DYN_CFG_HELPERS_H__
+#define __ARM_DYN_CFG_HELPERS_H__
+
+#include <stdint.h>
+
+/* Function declaration */
+int arm_dyn_get_hwconfig_info(void *dtb, int node,
+		uint64_t *hw_config_addr, uint32_t *hw_config_size);
+int arm_dyn_tb_fw_cfg_init(void *dtb, int *node);
+
+#endif /* __ARM_DYN_CFG_HELPERS_H__ */
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 933caeed..b2c7bd27 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -19,6 +19,7 @@
 struct bl31_params;
 struct meminfo;
 struct image_info;
+struct bl_params;
 
 #define ARM_CASSERT_MMAP						\
 	CASSERT((ARRAY_SIZE(plat_arm_mmap) + ARM_BL_REGIONS)		\
@@ -138,7 +139,7 @@ void arm_bl1_platform_setup(void);
 void arm_bl1_plat_arch_setup(void);
 
 /* BL2 utility functions */
-void arm_bl2_early_platform_setup(struct meminfo *mem_layout);
+void arm_bl2_early_platform_setup(uintptr_t tb_fw_config, struct meminfo *mem_layout);
 void arm_bl2_platform_setup(void);
 void arm_bl2_plat_arch_setup(void);
 uint32_t arm_get_spsr_for_bl32_entry(void);
@@ -180,6 +181,8 @@ int arm_io_is_toc_valid(void);
 
 /* Utility functions for Dynamic Config */
 void arm_load_tb_fw_config(void);
+void arm_bl2_set_tb_cfg_addr(void *dtb);
+void arm_bl2_dyn_cfg_init(void);
 
 /*
  * Mandatory functions required in ARM standard platforms