forked from Minki/linux
caab277b1d
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ARM64 ACPI Parking Protocol implementation
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*
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* Authors: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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* Mark Salter <msalter@redhat.com>
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*/
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#include <linux/acpi.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <asm/cpu_ops.h>
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struct parking_protocol_mailbox {
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__le32 cpu_id;
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__le32 reserved;
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__le64 entry_point;
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};
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struct cpu_mailbox_entry {
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struct parking_protocol_mailbox __iomem *mailbox;
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phys_addr_t mailbox_addr;
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u8 version;
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u8 gic_cpu_id;
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};
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static struct cpu_mailbox_entry cpu_mailbox_entries[NR_CPUS];
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void __init acpi_set_mailbox_entry(int cpu,
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struct acpi_madt_generic_interrupt *p)
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{
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struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
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cpu_entry->mailbox_addr = p->parked_address;
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cpu_entry->version = p->parking_version;
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cpu_entry->gic_cpu_id = p->cpu_interface_number;
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}
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bool acpi_parking_protocol_valid(int cpu)
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{
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struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
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return cpu_entry->mailbox_addr && cpu_entry->version;
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}
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static int acpi_parking_protocol_cpu_init(unsigned int cpu)
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{
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pr_debug("%s: ACPI parked addr=%llx\n", __func__,
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cpu_mailbox_entries[cpu].mailbox_addr);
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return 0;
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}
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static int acpi_parking_protocol_cpu_prepare(unsigned int cpu)
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{
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return 0;
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}
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static int acpi_parking_protocol_cpu_boot(unsigned int cpu)
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{
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struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
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struct parking_protocol_mailbox __iomem *mailbox;
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u32 cpu_id;
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/*
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* Map mailbox memory with attribute device nGnRE (ie ioremap -
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* this deviates from the parking protocol specifications since
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* the mailboxes are required to be mapped nGnRnE; the attribute
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* discrepancy is harmless insofar as the protocol specification
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* is concerned).
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* If the mailbox is mistakenly allocated in the linear mapping
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* by FW ioremap will fail since the mapping will be prevented
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* by the kernel (it clashes with the linear mapping attributes
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* specifications).
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*/
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mailbox = ioremap(cpu_entry->mailbox_addr, sizeof(*mailbox));
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if (!mailbox)
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return -EIO;
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cpu_id = readl_relaxed(&mailbox->cpu_id);
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/*
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* Check if firmware has set-up the mailbox entry properly
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* before kickstarting the respective cpu.
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*/
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if (cpu_id != ~0U) {
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iounmap(mailbox);
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return -ENXIO;
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}
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/*
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* stash the mailbox address mapping to use it for further FW
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* checks in the postboot method
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*/
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cpu_entry->mailbox = mailbox;
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/*
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* We write the entry point and cpu id as LE regardless of the
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* native endianness of the kernel. Therefore, any boot-loaders
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* that read this address need to convert this address to the
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* Boot-Loader's endianness before jumping.
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*/
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writeq_relaxed(__pa_symbol(secondary_entry), &mailbox->entry_point);
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writel_relaxed(cpu_entry->gic_cpu_id, &mailbox->cpu_id);
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arch_send_wakeup_ipi_mask(cpumask_of(cpu));
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return 0;
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}
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static void acpi_parking_protocol_cpu_postboot(void)
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{
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int cpu = smp_processor_id();
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struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
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struct parking_protocol_mailbox __iomem *mailbox = cpu_entry->mailbox;
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u64 entry_point;
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entry_point = readq_relaxed(&mailbox->entry_point);
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/*
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* Check if firmware has cleared the entry_point as expected
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* by the protocol specification.
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*/
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WARN_ON(entry_point);
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}
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const struct cpu_operations acpi_parking_protocol_ops = {
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.name = "parking-protocol",
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.cpu_init = acpi_parking_protocol_cpu_init,
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.cpu_prepare = acpi_parking_protocol_cpu_prepare,
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.cpu_boot = acpi_parking_protocol_cpu_boot,
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.cpu_postboot = acpi_parking_protocol_cpu_postboot
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};
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