linux-kernel - [PATCH v3 18/30] drivers/cpu: Add generic armv8 cpu driver

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Message-ID: <20240911062511.494855-19-patrick.rudolph@9elements.com>
Date: Wed, 11 Sep 2024 08:24:08 +0200
From: Patrick Rudolph <patrick.rudolph@...ements.com>
To: u-boot@...ts.denx.de,
	linux-kernel@...r.kernel.org
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
	Tom Rini <trini@...sulko.com>,
	Simon Glass <sjg@...omium.org>
Subject: [PATCH v3 18/30] drivers/cpu: Add generic armv8 cpu driver

Add a generic driver that binds to armv8 CPU nodes.

TEST: Booted on QEMU sbsa and verify the driver binds to CPU nodes.
      Confirmed with FWTS that all ACPI processor devices are present.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Cc: Tom Rini <trini@...sulko.com>
Cc: Simon Glass <sjg@...omium.org>
---
 drivers/cpu/Kconfig     |  6 +++
 drivers/cpu/Makefile    |  2 +
 drivers/cpu/armv8_cpu.c | 90 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+)
 create mode 100644 drivers/cpu/armv8_cpu.c

diff --git a/drivers/cpu/Kconfig b/drivers/cpu/Kconfig
index 5c06cd9f60..9c0df331d7 100644
--- a/drivers/cpu/Kconfig
+++ b/drivers/cpu/Kconfig
@@ -26,6 +26,12 @@ config CPU_RISCV
 	help
 	  Support CPU cores for RISC-V architecture.
 
+config CPU_ARMV8
+	bool "Enable generic ARMv8 CPU driver"
+	depends on CPU && ARM64
+	help
+	  Support CPU cores for armv8 architecture.
+
 config CPU_MICROBLAZE
 	bool "Enable Microblaze CPU driver"
 	depends on CPU && MICROBLAZE
diff --git a/drivers/cpu/Makefile b/drivers/cpu/Makefile
index bc75d9b974..773395693a 100644
--- a/drivers/cpu/Makefile
+++ b/drivers/cpu/Makefile
@@ -6,10 +6,12 @@
 
 obj-$(CONFIG_CPU) += cpu-uclass.o
 
+
 obj-$(CONFIG_ARCH_BMIPS) += bmips_cpu.o
 obj-$(CONFIG_ARCH_IMX8) += imx8_cpu.o
 obj-$(CONFIG_ARCH_AT91) += at91_cpu.o
 obj-$(CONFIG_ARCH_MEDIATEK) += mtk_cpu.o
+obj-$(CONFIG_CPU_ARMV8) += armv8_cpu.o
 obj-$(CONFIG_CPU_IMX) += imx8_cpu.o
 obj-$(CONFIG_CPU_MPC83XX) += mpc83xx_cpu.o
 obj-$(CONFIG_CPU_RISCV) += riscv_cpu.o
diff --git a/drivers/cpu/armv8_cpu.c b/drivers/cpu/armv8_cpu.c
new file mode 100644
index 0000000000..08b8d45f6f
--- /dev/null
+++ b/drivers/cpu/armv8_cpu.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Broadcom.
+ */
+#include <acpi/acpigen.h>
+#include <asm/armv8/cpu.h>
+#include <cpu.h>
+#include <dm.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)
+{
+	ofnode node;
+	int num = 0;
+
+	ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
+		const char *device_type;
+
+		if (!ofnode_is_enabled(node))
+			continue;
+
+		device_type = ofnode_read_string(node, "device_type");
+		if (!device_type)
+			continue;
+
+		if (!strcmp(device_type, "cpu"))
+			num++;
+	}
+
+	return num;
+}
+
+#ifdef CONFIG_ACPIGEN
+static int acpi_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	= acpi_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)
+};
-- 
2.46.0