ARM: hpe: gxp: add core support

The GXP is the HPE BMC SoC that is used in the majority
of current generation HPE servers. Traditionally the asic will
last multiple generations of server before being replaced.

Info about SoC:

HPE GXP is the name of the HPE Soc. This SoC is used to implement many BMC
features at HPE. It supports ARMv7 architecture based on the Cortex A9
core. It is capable of using an AXI bus to whicha memory controller is
attached. It has multiple SPI interfaces to connect boot flash and BIOS
flash. It uses a 10/100/1000 MAC for network connectivity. It has multiple
i2c engines to drive connectivity with a host infrastructure. There
currently are no public specifications but this process is being worked.

Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>

4 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mach-hpe/Makefile b/arch/arm/mach-hpe/Makefile
new file mode 100644
index 00000000000..afe5f7a29ee
--- /dev/null
+++ b/arch/arm/mach-hpe/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_SOC_GXP) += gxp/
diff --git a/arch/arm/mach-hpe/gxp/Kconfig b/arch/arm/mach-hpe/gxp/Kconfig
new file mode 100644
index 00000000000..2d43133ab06
--- /dev/null
+++ b/arch/arm/mach-hpe/gxp/Kconfig
@@ -0,0 +1,9 @@
+if ARCH_GXP
+
+config SOC_GXP
+	bool
+	select CPU_V7A
+
+source "board/hpe/gxp/Kconfig"
+
+endif
diff --git a/arch/arm/mach-hpe/gxp/Makefile b/arch/arm/mach-hpe/gxp/Makefile
new file mode 100644
index 00000000000..f3cc6684b89
--- /dev/null
+++ b/arch/arm/mach-hpe/gxp/Makefile
@@ -0,0 +1 @@
+obj-y += reset.o
diff --git a/arch/arm/mach-hpe/gxp/reset.c b/arch/arm/mach-hpe/gxp/reset.c
new file mode 100644
index 00000000000..ce018a35d94
--- /dev/null
+++ b/arch/arm/mach-hpe/gxp/reset.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * GXP driver
+ *
+ * (C) Copyright 2022 Hewlett Packard Enterprise Development LP.
+ * Author: Nick Hawkins <nick.hawkins@hpe.com>
+ * Author: Jean-Marie Verdun <verdun@hpe.com>
+ */
+
+#include <asm/io.h>
+
+#define GXP_CCR	0xc0000000
+
+/* empty to satisfy current lowlevel_init, can be removed any time */
+void lowlevel_init(void)
+{
+}
+
+void reset_cpu(ulong ignored)
+{
+	writel(1, GXP_CCR);
+
+	while (1)
+		;	/* loop forever till reset */
+}