arm64: renesas: Add Renesas R-Car Gen5 infrastructure

Add initial changes to support Renesas R-Car Gen5 SoC.

Introduce Kconfig entries, architecture headers and PRR IDs for Renesas
R-Car Gen5 and R-Car X5H R8A78000 SoC. Add Makefile change to produce
u-boot-elf.srec with correct offset for installation tooling. Update
MAINTAINERS entry to cover both r8a77nnn and r8a78nnn .

Signed-off-by: Hai Pham <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>

8 files changed, 73 insertions, 2 deletions

diff --git a/arch/arm/mach-renesas/Kconfig b/arch/arm/mach-renesas/Kconfig
index 8f4fba4615c..fa4e312a4dd 100644
--- a/arch/arm/mach-renesas/Kconfig
+++ b/arch/arm/mach-renesas/Kconfig
@@ -46,6 +46,11 @@ config RCAR_GEN4
 	select RCAR_64
 	select PINCTRL_PFC
 
+config RCAR_GEN5
+	bool "Renesas ARM SoCs R-Car Gen5 (64bit)"
+	select RCAR_64
+	select PINCTRL_PFC
+
 config RZA1
 	prompt "Renesas ARM SoCs RZ/A1 (32bit)"
 	select CPU_V7A
diff --git a/arch/arm/mach-renesas/Kconfig.64 b/arch/arm/mach-renesas/Kconfig.64
index b5067d0a8f0..1b1ed88339b 100644
--- a/arch/arm/mach-renesas/Kconfig.64
+++ b/arch/arm/mach-renesas/Kconfig.64
@@ -8,5 +8,6 @@ config OF_LIBFDT_OVERLAY
 
 source "arch/arm/mach-renesas/Kconfig.rcar3"
 source "arch/arm/mach-renesas/Kconfig.rcar4"
+source "arch/arm/mach-renesas/Kconfig.rcar5"
 
 endif
diff --git a/arch/arm/mach-renesas/Kconfig.rcar5 b/arch/arm/mach-renesas/Kconfig.rcar5
new file mode 100644
index 00000000000..34c0ae8772b
--- /dev/null
+++ b/arch/arm/mach-renesas/Kconfig.rcar5
@@ -0,0 +1,12 @@
+if RCAR_GEN5
+
+menu "Select Target SoC"
+
+config R8A78000
+	bool "Renesas SoC R8A78000"
+	select GICV3
+	imply PINCTRL_PFC_R8A78000
+
+endmenu
+
+endif
diff --git a/arch/arm/mach-renesas/Makefile b/arch/arm/mach-renesas/Makefile
index 9165ceab4a3..c0454fffa48 100644
--- a/arch/arm/mach-renesas/Makefile
+++ b/arch/arm/mach-renesas/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_RCAR_GEN2) += lowlevel_init_ca15.o cpu_info-rcar.o
 obj-$(CONFIG_RCAR_64) += lowlevel_init_gen3.o
 obj-$(CONFIG_RCAR_GEN3) += cpu_info-rcar.o memmap-gen3.o
 obj-$(CONFIG_RCAR_GEN4) += cpu_info-rcar.o memmap-gen3.o
+obj-$(CONFIG_RCAR_GEN5) += cpu_info-rcar.o memmap-gen3.o
 obj-$(CONFIG_RZ_G2) += cpu_info-rzg.o
 obj-$(CONFIG_RZG2L) += cpu_info-rzg2l.o memmap-rzg2l.o
 
diff --git a/arch/arm/mach-renesas/cpu_info-rcar.c b/arch/arm/mach-renesas/cpu_info-rcar.c
index 74140fd38ab..a6e0b739e55 100644
--- a/arch/arm/mach-renesas/cpu_info-rcar.c
+++ b/arch/arm/mach-renesas/cpu_info-rcar.c
@@ -15,8 +15,12 @@
 
 static u32 renesas_get_prr(void)
 {
-	if (IS_ENABLED(CONFIG_RCAR_64))
-		return readl(0xFFF00044);
+	if (IS_ENABLED(CONFIG_RCAR_64)) {
+		if (IS_ENABLED(CONFIG_RCAR_GEN5))
+			return readl(0x189E0044);
+		else
+			return readl(0xFFF00044);
+	}
 
 	return readl(0xFF000044);
 }
diff --git a/arch/arm/mach-renesas/cpu_info.c b/arch/arm/mach-renesas/cpu_info.c
index 2f9a4374a96..f040d732a51 100644
--- a/arch/arm/mach-renesas/cpu_info.c
+++ b/arch/arm/mach-renesas/cpu_info.c
@@ -72,6 +72,7 @@ static const struct {
 	{ RENESAS_CPU_TYPE_R8A779F0, "R8A779F0" },
 	{ RENESAS_CPU_TYPE_R8A779G0, "R8A779G0" },
 	{ RENESAS_CPU_TYPE_R8A779H0, "R8A779H0" },
+	{ RMOBILE_CPU_TYPE_R8A78000, "R8A78000" },
 	{ 0x0, "CPU" },
 };
 
diff --git a/arch/arm/mach-renesas/include/mach/rcar-gen5-base.h b/arch/arm/mach-renesas/include/mach/rcar-gen5-base.h
new file mode 100644
index 00000000000..f9af3ef885a
--- /dev/null
+++ b/arch/arm/mach-renesas/include/mach/rcar-gen5-base.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2025 Renesas Electronics Corp.
+ */
+
+#ifndef __ASM_ARCH_RCAR_GEN5_BASE_H
+#define __ASM_ARCH_RCAR_GEN5_BASE_H
+
+/*
+ * R-Car (R8A78000) I/O Addresses
+ */
+#define TMU_BASE		0x1C030000
+
+/* Arm Generic Timer */
+#define CNTCR_BASE		0x1C000FFF /* Region 0 */
+#define CNTFID0			(CNTCR_BASE + 0x020)
+#define CNTCR_EN		BIT(0)
+
+/* Reset */
+#define RST_BASE		0xC1320000 /* Domain0 */
+#define RST_SWSRES1A		(RST_BASE + 0x410)
+#define RST_WDTRSTCR		(RST_BASE + 0x420)
+#define RST_RWDT_RSTMSK		BIT(0)
+#define RST_WWDT_RSTMSK		BIT(2)
+#define RST_RESKCPROT0		(RST_BASE + 0x4F0)
+#define RST_KCPROT_DIS		0xA5A5A501
+
+/* GICv4 */
+/* Distributor Registers */
+#define GICD_BASE		0x38000000
+#define GICR_BASE		(GICR_LPI_BASE)
+
+/* ReDistributor Registers for Control and Physical LPIs */
+#define GICR_LPI_BASE		0x38080000
+#define GICR_WAKER		0x0014
+#define GICR_PWRR		0x0024
+#define GICR_LPI_WAKER		(GICR_LPI_BASE + GICR_WAKER)
+#define GICR_LPI_PWRR		(GICR_LPI_BASE + GICR_PWRR)
+
+/* ReDistributor Registers for SGIs and PPIs */
+#define GICR_SGI_BASE		0x38090000
+#define GICR_IGROUPR0		0x0080
+
+#endif /* __ASM_ARCH_RCAR_GEN5_BASE_H */
diff --git a/arch/arm/mach-renesas/include/mach/renesas.h b/arch/arm/mach-renesas/include/mach/renesas.h
index c69c764adb8..deaeffedef9 100644
--- a/arch/arm/mach-renesas/include/mach/renesas.h
+++ b/arch/arm/mach-renesas/include/mach/renesas.h
@@ -16,6 +16,8 @@
 #include <asm/arch/rcar-gen3-base.h>
 #elif defined(CONFIG_RCAR_GEN4)
 #include <asm/arch/rcar-gen4-base.h>
+#elif defined(CONFIG_RCAR_GEN5)
+#include <asm/arch/rcar-gen5-base.h>
 #elif defined(CONFIG_R7S72100)
 #elif defined(CONFIG_RZG2L)
 #include <asm/arch/rzg2l.h>
@@ -42,6 +44,7 @@
 #define RENESAS_CPU_TYPE_R8A779F0	0x5A
 #define RENESAS_CPU_TYPE_R8A779G0	0x5C
 #define RENESAS_CPU_TYPE_R8A779H0	0x5D
+#define RMOBILE_CPU_TYPE_R8A78000	0x60
 #define RENESAS_CPU_TYPE_R9A07G044L	0x9A070440
 
 #ifndef __ASSEMBLY__