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