mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-27 01:58:19 +00:00
83a2f4a8d2
Add a generic driver that binds to armv8 CPU nodes. The generic driver allows
- to enumerate CPUs present in a system, even when no other driver binds it
- generates ACPI SSDT code for each CPU
- Fill the ACPI MADT table (implemented in a follow up patch)
The newly introduced code could also be reused on other CPU drivers that are
compatible with armv8.
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@9elements.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
// 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)
|
|
};
|