Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ARM64 CPU idle arch support
 *
 * Copyright (C) 2014 ARM Ltd.
 * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
 */
 
#include <linux/acpi.h>
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/psci.h>
 
#include <asm/cpuidle.h>
#include <asm/cpu_ops.h>
 
int arm_cpuidle_init(unsigned int cpu)
{
<------>const struct cpu_operations *ops = get_cpu_ops(cpu);
<------>int ret = -EOPNOTSUPP;
 
<------>if (ops && ops->cpu_suspend && ops->cpu_init_idle)
<------><------>ret = ops->cpu_init_idle(cpu);
 
<------>return ret;
}
 
/**
 * arm_cpuidle_suspend() - function to enter a low-power idle state
 * @arg: argument to pass to CPU suspend operations
 *
 * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
 * operations back-end error code otherwise.
 */
int arm_cpuidle_suspend(int index)
{
<------>int cpu = smp_processor_id();
<------>const struct cpu_operations *ops = get_cpu_ops(cpu);
 
<------>return ops->cpu_suspend(index);
}
 
#ifdef CONFIG_ACPI
 
#include <acpi/processor.h>
 
#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
 
static int psci_acpi_cpu_init_idle(unsigned int cpu)
{
<------>int i, count;
<------>struct acpi_lpi_state *lpi;
<------>struct acpi_processor *pr = per_cpu(processors, cpu);
 
<------>/*
<------> * If the PSCI cpu_suspend function hook has not been initialized
<------> * idle states must not be enabled, so bail out
<------> */
<------>if (!psci_ops.cpu_suspend)
<------><------>return -EOPNOTSUPP;
 
<------>if (unlikely(!pr || !pr->flags.has_lpi))
<------><------>return -EINVAL;
 
<------>count = pr->power.count - 1;
<------>if (count <= 0)
<------><------>return -ENODEV;
 
<------>for (i = 0; i < count; i++) {
<------><------>u32 state;
 
<------><------>lpi = &pr->power.lpi_states[i + 1];
<------><------>/*
<------><------> * Only bits[31:0] represent a PSCI power_state while
<------><------> * bits[63:32] must be 0x0 as per ARM ACPI FFH Specification
<------><------> */
<------><------>state = lpi->address;
<------><------>if (!psci_power_state_is_valid(state)) {
<------><------><------>pr_warn("Invalid PSCI power state %#x\n", state);
<------><------><------>return -EINVAL;
<------><------>}
<------>}
 
<------>return 0;
}
 
int acpi_processor_ffh_lpi_probe(unsigned int cpu)
{
<------>return psci_acpi_cpu_init_idle(cpu);
}
 
int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
{
<------>u32 state = lpi->address;
 
<------>if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags))
<------><------>return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(psci_cpu_suspend_enter,
<------><------><------><------><------><------>lpi->index, state);
<------>else
<------><------>return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
<------><------><------><------><------>     lpi->index, state);
}
#endif