[PATCH 1/2] arm: mach-rmobile: Move cpu_reset to rzg2-reset.c

[Adam Ford]

Various RZ/G2[MNH] boards have copies of cpu_reset which
creates duplicate code, so move this to a common file shared
among all users of the RZG2 and declare it weak so it can be
overwritten if necessary.

Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/arch/arm/mach-rmobile/Makefile b/arch/arm/mach-rmobile/Makefile
index 195bbeb5c8..2bd173ec3a 100644
--- a/arch/arm/mach-rmobile/Makefile
+++ b/arch/arm/mach-rmobile/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_SH73A0) += lowlevel_init.o cpu_info-sh73a0.o pfc-sh73a0.o
 obj-$(CONFIG_R8A7740) += lowlevel_init.o cpu_info-r8a7740.o pfc-r8a7740.o
 obj-$(CONFIG_RCAR_GEN2) += lowlevel_init_ca15.o cpu_info-rcar.o
 obj-$(CONFIG_RCAR_GEN3) += lowlevel_init_gen3.o cpu_info-rcar.o memmap-gen3.o
-obj-$(CONFIG_RZ_G2) += cpu_info-rzg.o
+obj-$(CONFIG_RZ_G2) += cpu_info-rzg.o rzg2-reset.o
 
 ifneq ($(CONFIG_R8A779A0),)
 obj-$(CONFIG_ARMV8_PSCI) += psci-r8a779a0.o
diff --git a/arch/arm/mach-rmobile/rzg2-reset.c b/arch/arm/mach-rmobile/rzg2-reset.c
new file mode 100644
index 0000000000..8c3608f34a
--- /dev/null
+++ b/arch/arm/mach-rmobile/rzg2-reset.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 Renesas Electronics Corporation
+ */
+
+#include <asm/io.h>
+
+#define RST_BASE	0xE6160000
+#define RST_CA57RESCNT	(RST_BASE + 0x40)
+#define RST_CA53RESCNT	(RST_BASE + 0x44)
+#define RST_CA57_CODE	0xA5A5000F
+#define RST_CA53_CODE	0x5A5A000F
+
+__weak void reset_cpu(void)
+{
+	unsigned long midr, cputype;
+
+	asm volatile("mrs %0, midr_el1" : "=r" (midr));
+	cputype = (midr >> 4) & 0xfff;
+
+	if (cputype == 0xd03)
+		writel(RST_CA53_CODE, RST_CA53RESCNT);
+	else
+		writel(RST_CA57_CODE, RST_CA57RESCNT);
+}
+
-- 
2.25.1