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// 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)
};
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