Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-sh

Add empty weak assembler function armv8_switch_to_el2_prep() which is
jumped to just before U-Boot determines which EL it is running in and
decides which path to take to boot the Linux kernel. Add
IH_TYPE_TFA_BL31 into supported images type, to allow implementation of
board specific U_BOOT_FIT_LOADABLE_HANDLER(IH_TYPE_TFA_BL31, ...) TFA
BL31 loadable handler for fitImages.

This PR contains common hooks which are noop, R-Car Gen4 board specific
implementation using these hooks is coming in next PR.

arch/arm/cpu/armv8/transition.S

@@ -9,8 +9,16 @@
 #include <linux/linkage.h>
 #include <asm/macro.h>
 
+.pushsection .text.armv8_switch_to_el2_prep, "ax"
+WEAK(armv8_switch_to_el2_prep)
+	ret
+ENDPROC(armv8_switch_to_el2_prep)
+.popsection
+
 .pushsection .text.armv8_switch_to_el2, "ax"
 ENTRY(armv8_switch_to_el2)
+	bl	armv8_switch_to_el2_prep
+	nop
 	switch_el x6, 1f, 0f, 0f
 0:
 	cmp x5, #ES_TO_AARCH64

arch/arm/include/asm/system.h

@@ -238,6 +238,22 @@ int __asm_flush_l3_dcache(void);
 int __asm_invalidate_l3_icache(void);
 void __asm_switch_ttbr(u64 new_ttbr);
 
+/*
+ * armv8_switch_to_el2_prep() - prepare for switch from EL3 to EL2 for ARMv8
+ *
+ * @args:        For loading 64-bit OS, fdt address.
+ *               For loading 32-bit OS, zero.
+ * @mach_nr:     For loading 64-bit OS, zero.
+ *               For loading 32-bit OS, machine nr
+ * @fdt_addr:    For loading 64-bit OS, zero.
+ *               For loading 32-bit OS, fdt address.
+ * @arg4:	 Input argument.
+ * @entry_point: kernel entry point
+ * @es_flag:     execution state flag, ES_TO_AARCH64 or ES_TO_AARCH32
+ */
+void armv8_switch_to_el2_prep(u64 args, u64 mach_nr, u64 fdt_addr,
+			      u64 arg4, u64 entry_point, u64 es_flag);
+
 /*
  * armv8_switch_to_el2() - switch from EL3 to EL2 for ARMv8
  *

boot/image-fit.c

@@ -2175,6 +2175,7 @@ int fit_image_load(struct bootm_headers *images, ulong addr,
 	type_ok = fit_image_check_type(fit, noffset, image_type) ||
 		  fit_image_check_type(fit, noffset, IH_TYPE_FIRMWARE) ||
 		  fit_image_check_type(fit, noffset, IH_TYPE_TEE) ||
+		  fit_image_check_type(fit, noffset, IH_TYPE_TFA_BL31) ||
 		  (image_type == IH_TYPE_KERNEL &&
 		   fit_image_check_type(fit, noffset, IH_TYPE_KERNEL_NOLOAD));
 

boot/image.c

@@ -183,6 +183,7 @@ static const table_entry_t uimage_type[] = {
 	{	IH_TYPE_FDT_LEGACY, "fdt_legacy", "legacy Image with Flat Device Tree ", },
 	{	IH_TYPE_RENESAS_SPKG, "spkgimage", "Renesas SPKG Image" },
 	{	IH_TYPE_STARFIVE_SPL, "sfspl", "StarFive SPL Image" },
+	{	IH_TYPE_TFA_BL31, "tfa-bl31",  "TFA BL31 Image", },
 	{	-1,		    "",		  "",			},
 };
 

include/image.h

@@ -232,6 +232,7 @@ enum image_type_t {
 	IH_TYPE_FDT_LEGACY,		/* Binary Flat Device Tree Blob	in a Legacy Image */
 	IH_TYPE_RENESAS_SPKG,		/* Renesas SPKG image */
 	IH_TYPE_STARFIVE_SPL,		/* StarFive SPL image */
+	IH_TYPE_TFA_BL31,		/* TFA BL31 image */
 
 	IH_TYPE_COUNT,			/* Number of image types */
 };