xilinx: versal: PLM to ATF handover

Parse the parameter structure the PLM populates, to populate the
bl32 and bl33 image structures.
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I317072d1086f6cc6f90883c1b8b6d086ff57b443

docs/plat/xilinx-versal.rst

@@ -33,3 +33,11 @@ Xilinx Versal platform specific build options
 
 *   `VERSAL_PLATFORM`: Select the platform. Options:
     -   `versal_virt`	: Versal Virtual platform
+
+# PLM->TF-A Parameter Passing
+------------------------------
+The PLM populates a data structure with image information for the TF-A. The TF-A
+uses that data to hand off to the loaded images. The address of the handoff
+data structure is passed in the ```PMC_GLOBAL_GLOB_GEN_STORAGE4``` register.
+The register is free to be used by other software once the TF-A is bringing up
+further firmware images.

plat/xilinx/versal/aarch64/versal_common.c

 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -67,11 +67,3 @@ unsigned int plat_get_syscnt_freq2(void)
 	return VERSAL_CPU_CLOCK;
 }
 
-uintptr_t plat_get_ns_image_entrypoint(void)
-{
-#ifdef PRELOADED_BL33_BASE
-	return PRELOADED_BL33_BASE;
-#else
-	return PLAT_VERSAL_NS_IMAGE_OFFSET;
-#endif
-}

plat/xilinx/versal/bl31_versal_setup.c

 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -13,8 +13,12 @@
 #include <common/debug.h>
 #include <drivers/arm/pl011.h>
 #include <drivers/console.h>
+#include <lib/mmio.h>
 #include <lib/xlat_tables/xlat_tables.h>
 #include <plat/common/platform.h>
+#include <versal_def.h>
+#include <plat_private.h>
+#include <plat_startup.h>
 
 static entry_point_info_t bl32_image_ep_info;
 static entry_point_info_t bl33_image_ep_info;
@@ -36,6 +40,18 @@ entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
 	return &bl32_image_ep_info;
 }
 
+/*
+ * Set the build time defaults,if we can't find any config data.
+ */
+static inline void bl31_set_default_config(void)
+{
+	bl32_image_ep_info.pc = BL32_BASE;
+	bl32_image_ep_info.spsr = arm_get_spsr_for_bl32_entry();
+	bl33_image_ep_info.pc = plat_get_ns_image_entrypoint();
+	bl33_image_ep_info.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+}
+
 /*
  * Perform any BL31 specific platform actions. Here is an opportunity to copy
  * parameters passed by the calling EL (S-EL1 in BL2 & S-EL3 in BL1) before they
@@ -45,6 +61,7 @@ entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
 void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
 				u_register_t arg2, u_register_t arg3)
 {
+	uint64_t atf_handoff_addr;
 
 	/* Initialize the console to provide early debug support */
 	int rc = console_pl011_register(VERSAL_UART_BASE,
@@ -76,12 +93,15 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
 	SET_PARAM_HEAD(&bl33_image_ep_info, PARAM_EP, VERSION_1, 0);
 	SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE);
 
-	/* use build time defaults in JTAG boot mode */
-	bl32_image_ep_info.pc = BL32_BASE;
-	bl32_image_ep_info.spsr = 0;
-	bl33_image_ep_info.pc = plat_get_ns_image_entrypoint();
-	bl33_image_ep_info.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
-					  DISABLE_ALL_EXCEPTIONS);
+	atf_handoff_addr = mmio_read_32(PMC_GLOBAL_GLOB_GEN_STORAGE4);
+	enum fsbl_handoff ret = fsbl_atf_handover(&bl32_image_ep_info,
+						  &bl33_image_ep_info,
+						  atf_handoff_addr);
+	if (ret == FSBL_HANDOFF_NO_STRUCT) {
+		bl31_set_default_config();
+	} else if (ret != FSBL_HANDOFF_SUCCESS) {
+		panic();
+	}
 
 	NOTICE("BL31: Secure code at 0x%lx\n", bl32_image_ep_info.pc);
 	NOTICE("BL31: Non secure code at 0x%lx\n", bl33_image_ep_info.pc);

plat/xilinx/versal/include/platform_def.h

 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -56,9 +56,9 @@
  * BL33 specific defines.
  ******************************************************************************/
 #ifndef PRELOADED_BL33_BASE
-# define PLAT_VERSAL_NS_IMAGE_OFFSET	0x8000000
+# define PLAT_ARM_NS_IMAGE_BASE		0x8000000
 #else
-# define PLAT_VERSAL_NS_IMAGE_OFFSET	PRELOADED_BL33_BASE
+# define PLAT_ARM_NS_IMAGE_BASE		PRELOADED_BL33_BASE
 #endif
 
 /*******************************************************************************

plat/xilinx/versal/include/versal_def.h

 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -121,6 +121,10 @@
 #define APU_0_PWRCTL_CPUPWRDWNREQ_MASK	1
 #define APU_1_PWRCTL_CPUPWRDWNREQ_MASK	2
 
+/* PMC registers and bitfields */
+#define PMC_GLOBAL_BASE			0xF1110000
+#define PMC_GLOBAL_GLOB_GEN_STORAGE4	(PMC_GLOBAL_BASE + 0x40)
+
 /* IPI registers and bitfields */
 #define IPI0_REG_BASE		0xFF330000
 #define IPI0_TRIG_BIT		(1 << 2)

plat/xilinx/versal/platform.mk

-# Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 
@@ -55,6 +55,7 @@ PLAT_BL_COMMON_SOURCES	:=	lib/xlat_tables/xlat_tables_common.c		\
 				drivers/arm/pl011/aarch64/pl011_console.S	\
 				plat/common/aarch64/crash_console_helpers.S	\
 				plat/arm/common/arm_cci.c			\
+				plat/arm/common/arm_common.c			\
 				plat/common/plat_gicv3.c			\
 				plat/xilinx/versal/aarch64/versal_helpers.S	\
 				plat/xilinx/versal/aarch64/versal_common.c
@@ -64,6 +65,7 @@ BL31_SOURCES		+=	drivers/arm/cci/cci.c				\
 				lib/cpus/aarch64/cortex_a72.S			\
 				plat/common/plat_psci_common.c			\
 				plat/xilinx/common/ipi.c			\
+				plat/xilinx/common/plat_startup.c		\
 				plat/xilinx/common/ipi_mailbox_service/ipi_mailbox_svc.c \
 				plat/xilinx/common/pm_service/pm_ipi.c		\
 				plat/xilinx/versal/bl31_versal_setup.c		\