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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>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* CPU kernel entry/exit control
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*
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* Copyright (C) 2013 ARM Ltd.
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*/
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#include <linux/acpi.h>
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#include <linux/cache.h>
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#include <linux/errno.h>
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#include <linux/of.h>
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#include <linux/string.h>
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#include <asm/acpi.h>
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#include <asm/cpu_ops.h>
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#include <asm/smp_plat.h>
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extern const struct cpu_operations smp_spin_table_ops;
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extern const struct cpu_operations acpi_parking_protocol_ops;
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extern const struct cpu_operations cpu_psci_ops;
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const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
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static const struct cpu_operations *const dt_supported_cpu_ops[] __initconst = {
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&smp_spin_table_ops,
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&cpu_psci_ops,
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NULL,
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};
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static const struct cpu_operations *const acpi_supported_cpu_ops[] __initconst = {
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#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
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&acpi_parking_protocol_ops,
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#endif
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&cpu_psci_ops,
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NULL,
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};
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static const struct cpu_operations * __init cpu_get_ops(const char *name)
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{
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const struct cpu_operations *const *ops;
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ops = acpi_disabled ? dt_supported_cpu_ops : acpi_supported_cpu_ops;
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while (*ops) {
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if (!strcmp(name, (*ops)->name))
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return *ops;
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ops++;
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}
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return NULL;
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}
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static const char *__init cpu_read_enable_method(int cpu)
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{
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const char *enable_method;
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if (acpi_disabled) {
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struct device_node *dn = of_get_cpu_node(cpu, NULL);
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if (!dn) {
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if (!cpu)
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pr_err("Failed to find device node for boot cpu\n");
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return NULL;
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}
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enable_method = of_get_property(dn, "enable-method", NULL);
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if (!enable_method) {
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/*
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* The boot CPU may not have an enable method (e.g.
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* when spin-table is used for secondaries).
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* Don't warn spuriously.
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*/
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if (cpu != 0)
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pr_err("%pOF: missing enable-method property\n",
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dn);
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}
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of_node_put(dn);
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} else {
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enable_method = acpi_get_enable_method(cpu);
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if (!enable_method) {
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/*
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* In ACPI systems the boot CPU does not require
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* checking the enable method since for some
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* boot protocol (ie parking protocol) it need not
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* be initialized. Don't warn spuriously.
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*/
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if (cpu != 0)
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pr_err("Unsupported ACPI enable-method\n");
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}
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}
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return enable_method;
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}
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/*
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* Read a cpu's enable method and record it in cpu_ops.
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*/
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int __init cpu_read_ops(int cpu)
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{
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const char *enable_method = cpu_read_enable_method(cpu);
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if (!enable_method)
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return -ENODEV;
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cpu_ops[cpu] = cpu_get_ops(enable_method);
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if (!cpu_ops[cpu]) {
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pr_warn("Unsupported enable-method: %s\n", enable_method);
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return -EOPNOTSUPP;
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}
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return 0;
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}
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