[PATCH 1/1] ARM: owl: Add Actions Semi Owl S500 SoC machine

[Cristian Ciocaltea]

Add machine entry for the S500 variant of the Actions Semi Owl SoCs
family.

For the moment the only purpose is to provide the system serial
information which will be used by the Owl Ethernet MAC driver to
generate a stable MAC address.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at gmail.com>
---
 arch/arm/mach-actions/Makefile  |  1 +
 arch/arm/mach-actions/actions.c | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 arch/arm/mach-actions/actions.c

diff --git a/arch/arm/mach-actions/Makefile b/arch/arm/mach-actions/Makefile
index 8eae9587fe82..31865c958d92 100644
--- a/arch/arm/mach-actions/Makefile
+++ b/arch/arm/mach-actions/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
+obj-${CONFIG_ARCH_ACTIONS} += actions.o
 obj-${CONFIG_SMP} += platsmp.o
diff --git a/arch/arm/mach-actions/actions.c b/arch/arm/mach-actions/actions.c
new file mode 100644
index 000000000000..306c6bb178fe
--- /dev/null
+++ b/arch/arm/mach-actions/actions.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Actions Semi Owl SoCs
+ *
+ * Copyright (c) 2012 Actions Semi Inc.
+ * Copyright (c) 2021 Cristian Ciocaltea <cristian.ciocaltea at gmail.com>
+ */
+
+#include <linux/highmem.h>
+#include <linux/of_platform.h>
+
+#include <asm/mach/arch.h>
+#include <asm/system_info.h>
+
+#define OWL_S500_SERIAL_LOW_PAGE_OFF		0x800
+#define OWL_S500_SERIAL_HIGH_PAGE_OFF		0x804
+
+static const char *const owl_s500_dt_compat[] __initconst = {
+	"actions,s500",
+	NULL,
+};
+
+static void __init owl_s500_get_system_serial(void)
+{
+	char *vddr = kmap_local_page(pfn_to_page(PFN_DOWN(0)));
+
+	memcpy(&system_serial_low, vddr + OWL_S500_SERIAL_LOW_PAGE_OFF,
+	       sizeof(system_serial_low));
+	memcpy(&system_serial_high, vddr + OWL_S500_SERIAL_HIGH_PAGE_OFF,
+	       sizeof(system_serial_high));
+
+	kunmap_local(vddr);
+}
+
+static void __init owl_s500_init_early(void)
+
+{
+	owl_s500_get_system_serial();
+}
+
+DT_MACHINE_START(ACTIONS, "Actions Semi Owl S500 SoC")
+	.dt_compat	= owl_s500_dt_compat,
+	.init_early	= owl_s500_init_early,
+MACHINE_END
-- 
2.30.2