plat/arm: Use only fw_config between bl2 and bl31

Passed the address of fw_config instead of soc_fw_config
as arg1 to BL31 from BL2 for ARM fvp platform.

BL31 then retrieve load-address of other device trees
from fw_config device tree.
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ib7e9581cd765d76111dcc3b7e0dafc12503c83c1

plat/arm/board/fvp/fdts/fvp_fw_config.dts

@@ -31,14 +31,14 @@
 		 * is loaded at base of DRAM.
 		 */
 		soc_fw-config {
-			load-address = <0x0 0x04001000>;
+			load-address = <0x0 0x04001300>;
 			max-size = <0x200>;
 			id = <SOC_FW_CONFIG_ID>;
 		};
 
 		tos_fw-config {
-			load-address = <0x0 0x04001200>;
-			max-size = <0x1000>;
+			load-address = <0x0 0x04001500>;
+			max-size = <0xB00>;
 			id = <TOS_FW_CONFIG_ID>;
 		};
 

plat/arm/board/fvp/fvp_bl2_setup.c

@@ -4,7 +4,13 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include <assert.h>
+
+#include <common/desc_image_load.h>
 #include <drivers/arm/sp804_delay_timer.h>
+#include <lib/fconf/fconf.h>
+#include <lib/fconf/fconf_dyn_cfg_getter.h>
+
 #include <plat/arm/common/plat_arm.h>
 #include <plat/common/platform.h>
 #include <platform_def.h>
@@ -26,3 +32,40 @@ void bl2_platform_setup(void)
 	/* Initialize System level generic or SP804 timer */
 	fvp_timer_init();
 }
+
+/*******************************************************************************
+ * This function returns the list of executable images
+ ******************************************************************************/
+struct bl_params *plat_get_next_bl_params(void)
+{
+	struct bl_params *arm_bl_params;
+
+	arm_bl_params = arm_get_next_bl_params();
+
+#if __aarch64__ && !BL2_AT_EL3
+	const struct dyn_cfg_dtb_info_t *fw_config_info;
+	bl_mem_params_node_t *param_node;
+	uintptr_t fw_config_base = 0U;
+	entry_point_info_t *ep_info;
+
+	/* Get BL31 image node */
+	param_node = get_bl_mem_params_node(BL31_IMAGE_ID);
+	assert(param_node != NULL);
+
+	/* get fw_config load address */
+	fw_config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, FW_CONFIG_ID);
+	assert(fw_config_info != NULL);
+
+	fw_config_base = fw_config_info->config_addr;
+	assert(fw_config_base != 0U);
+
+	/*
+	 * Get the entry point info of BL31 image and override
+	 * arg1 of entry point info with fw_config base address
+	 */
+	ep_info = &param_node->ep_info;
+	ep_info->args.arg1 = (uint32_t)fw_config_base;
+#endif /* __aarch64__ && !BL2_AT_EL3 */
+
+	return arm_bl_params;
+}

plat/arm/board/fvp/fvp_bl31_setup.c

@@ -9,6 +9,7 @@
 #include <drivers/arm/smmu_v3.h>
 #include <fconf_hw_config_getter.h>
 #include <lib/fconf/fconf.h>
+#include <lib/fconf/fconf_dyn_cfg_getter.h>
 #include <lib/mmio.h>
 #include <plat/arm/common/arm_config.h>
 #include <plat/arm/common/plat_arm.h>
@@ -16,11 +17,22 @@
 
 #include "fvp_private.h"
 
-uintptr_t hw_config_dtb;
-
 void __init bl31_early_platform_setup2(u_register_t arg0,
 		u_register_t arg1, u_register_t arg2, u_register_t arg3)
 {
+#if !RESET_TO_BL31 && !BL2_AT_EL3
+	const struct dyn_cfg_dtb_info_t *soc_fw_config_info;
+
+	INFO("BL31 FCONF: FW_CONFIG address = %lx\n", (uintptr_t)arg1);
+	/* Fill the properties struct with the info from the config dtb */
+	fconf_populate("FW_CONFIG", arg1);
+
+	soc_fw_config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, SOC_FW_CONFIG_ID);
+	if (soc_fw_config_info != NULL) {
+		arg1 = soc_fw_config_info->config_addr;
+	}
+#endif /* !RESET_TO_BL31 && !BL2_AT_EL3 */
+
 	arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);
 
 	/* Initialize the platform config for future decision making */
@@ -47,8 +59,6 @@ void __init bl31_early_platform_setup2(u_register_t arg0,
 	/* On FVP RevC, initialize SMMUv3 */
 	if ((arm_config.flags & ARM_CONFIG_FVP_HAS_SMMUV3) != 0U)
 		smmuv3_init(PLAT_FVP_SMMUV3_BASE);
-
-	hw_config_dtb = arg2;
 }
 
 void __init bl31_plat_arch_setup(void)
@@ -61,10 +71,13 @@ void __init bl31_plat_arch_setup(void)
 	 * control is passed to BL31.
 	 */
 #if !RESET_TO_BL31 && !BL2_AT_EL3
-	assert(hw_config_dtb != 0U);
+	/* HW_CONFIG was also loaded by BL2 */
+	const struct dyn_cfg_dtb_info_t *hw_config_info;
+
+	hw_config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, HW_CONFIG_ID);
+	assert(hw_config_info != NULL);
 
-	INFO("BL31 FCONF: HW_CONFIG address = %p\n", (void *)hw_config_dtb);
-	fconf_populate("HW_CONFIG", hw_config_dtb);
+	fconf_populate("HW_CONFIG", hw_config_info->config_addr);
 #endif
 }
 

plat/arm/board/fvp/platform.mk

@@ -217,6 +217,7 @@ BL31_SOURCES		+=	drivers/arm/fvp/fvp_pwrc.c			\
 ifeq ($(filter 1,${BL2_AT_EL3} ${RESET_TO_BL31}),)
 BL31_SOURCES		+=	common/fdt_wrappers.c				\
 				lib/fconf/fconf.c				\
+				lib/fconf/fconf_dyn_cfg_getter.c		\
 				plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
 
 ifeq (${SEC_INT_DESC_IN_FCONF},1)