intel: stratix10: Enable uboot entrypoint support

This patch will provide an entrypoint for uboot's spl into BL31.
BL31 will also handle secondary cpu state during uboot's cold boot
Signed-off-by: Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: I661bdb782c2d793d5fc3c7f78dd7ff746e33b7a3

plat/intel/soc/common/aarch64/plat_helpers.S

@@ -8,6 +8,7 @@
 #include <asm_macros.S>
 #include <cpu_macros.S>
 #include <platform_def.h>
+#include <el3_common_macros.S>
 
 	.globl	plat_secondary_cold_boot_setup
 	.globl	platform_is_primary_cpu
@@ -17,6 +18,7 @@
 	.globl	plat_crash_console_putc
 	.globl  plat_crash_console_flush
 	.globl	platform_mem_init
+	.globl	plat_secondary_cpus_bl31_entry
 
 	.globl plat_get_my_entrypoint
 
@@ -33,7 +35,6 @@ func plat_secondary_cold_boot_setup
 	/* Wait until the it gets reset signal from rstmgr gets populated */
 poll_mailbox:
 	wfi
-
 	mov_imm	x0, PLAT_SEC_ENTRY
 	ldr	x1, [x0]
 	mov_imm	x2, PLAT_CPUID_RELEASE
@@ -114,3 +115,14 @@ func platform_mem_init
 	mov	x0, #0
 	ret
 endfunc platform_mem_init
+
+func plat_secondary_cpus_bl31_entry
+	el3_entrypoint_common                                   \
+		_init_sctlr=0                                   \
+		_warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS  \
+		_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU      \
+		_init_memory=1                                  \
+		_init_c_runtime=1                               \
+		_exception_vectors=runtime_exceptions		\
+		_pie_fixup_size=BL31_LIMIT - BL31_BASE
+endfunc plat_secondary_cpus_bl31_entry

plat/intel/soc/common/include/platform_def.h

@@ -19,6 +19,9 @@
 #define PLAT_CPUID_RELEASE			0xffe1b000
 #define PLAT_SEC_ENTRY				0xffe1b008
 
+/* sysmgr.boot_scratch_cold4 & 5 used for CPU release address for SPL */
+#define PLAT_CPU_RELEASE_ADDR			0xffd12210
+
 /* Define next boot image name and offset */
 #define PLAT_NS_IMAGE_OFFSET			0x50000
 #define PLAT_HANDOFF_OFFSET			0xFFE3F000

plat/intel/soc/common/include/socfpga_private.h

@@ -61,5 +61,6 @@ uint32_t socfpga_get_spsr_for_bl33_entry(void);
 
 unsigned long socfpga_get_ns_image_entrypoint(void);
 
+void plat_secondary_cpus_bl31_entry(void);
 
 #endif /* SOCFPGA_PRIVATE_H */

plat/intel/soc/stratix10/bl31_plat_setup.c

@@ -100,6 +100,10 @@ void bl31_platform_setup(void)
 	gicv2_distif_init();
 	gicv2_pcpu_distif_init();
 	gicv2_cpuif_enable();
+
+	/* Signal secondary CPUs to jump to BL31 (BL2 = U-boot SPL) */
+	mmio_write_64(PLAT_CPU_RELEASE_ADDR,
+		(uint64_t)plat_secondary_cpus_bl31_entry);
 }
 
 const mmap_region_t plat_stratix10_mmap[] = {