1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/cpu/armv8_cpu.c b/drivers/cpu/armv8_cpu.c
new file mode 100644
index 00000000000..19f072be430
--- /dev/null
+++ b/drivers/cpu/armv8_cpu.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2024 9elements GmbH
+ */
+#include <cpu.h>
+#include <dm.h>
+#include <acpi/acpigen.h>
+#include <asm/armv8/cpu.h>
+#include <dm/acpi.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+#include <linux/printk.h>
+#include <linux/sizes.h>
+
+static int armv8_cpu_get_desc(const struct udevice *dev, char *buf, int size)
+{
+	int cpuid;
+
+	cpuid = (read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT;
+
+	snprintf(buf, size, "CPU MIDR %04x", cpuid);
+
+	return 0;
+}
+
+static int armv8_cpu_get_info(const struct udevice *dev,
+			      struct cpu_info *info)
+{
+	info->cpu_freq = 0;
+	info->features = BIT(CPU_FEAT_L1_CACHE) | BIT(CPU_FEAT_MMU);
+
+	return 0;
+}
+
+static int armv8_cpu_get_count(const struct udevice *dev)
+{
+	return uclass_id_count(UCLASS_CPU);
+}
+
+#ifdef CONFIG_ACPIGEN
+int armv8_cpu_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
+{
+	uint core_id = dev_seq(dev);
+
+	acpigen_write_processor_device(ctx, core_id);
+
+	return 0;
+}
+
+struct acpi_ops armv8_cpu_acpi_ops = {
+	.fill_ssdt	= armv8_cpu_fill_ssdt,
+};
+#endif
+
+static const struct cpu_ops cpu_ops = {
+	.get_count = armv8_cpu_get_count,
+	.get_desc  = armv8_cpu_get_desc,
+	.get_info  = armv8_cpu_get_info,
+};
+
+static const struct udevice_id cpu_ids[] = {
+	{ .compatible = "arm,armv8" },
+	{}
+};
+
+U_BOOT_DRIVER(arm_cpu) = {
+	.name		= "arm-cpu",
+	.id		= UCLASS_CPU,
+	.of_match	= cpu_ids,
+	.ops		= &cpu_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
+	ACPI_OPS_PTR(&armv8_cpu_acpi_ops)
+};