// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright (C) 2012 ARM Limited
 *
 * Author: Will Deacon <will.deacon@arm.com>
 */

#include <linux/init.h>
#include <linux/smp.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/psci.h>

#include <uapi/linux/psci.h>

#include <asm/psci.h>
#include <asm/smp_plat.h>

/*
 * psci_smp assumes that the following is true about PSCI:
 *
 * cpu_suspend   Suspend the execution on a CPU
 * @state        we don't currently describe affinity levels, so just pass 0.
 * @entry_point  the first instruction to be executed on return
 * returns 0  success, < 0 on failure
 *
 * cpu_off       Power down a CPU
 * @state        we don't currently describe affinity levels, so just pass 0.
 * no return on successful call
 *
 * cpu_on        Power up a CPU
 * @cpuid        cpuid of target CPU, as from MPIDR
 * @entry_point  the first instruction to be executed on return
 * returns 0  success, < 0 on failure
 *
 * migrate       Migrate the context to a different CPU
 * @cpuid        cpuid of target CPU, as from MPIDR
 * returns 0  success, < 0 on failure
 *
 */

extern void secondary_startup(void);

static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
        if (psci_ops.cpu_on)
#ifdef CONFIG_XIP_KERNEL
                return psci_ops.cpu_on(cpu_logical_map(cpu),
                        ((phys_addr_t)(&secondary_startup)
                        - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
                        + CONFIG_XIP_PHYS_ADDR));
#else
                return psci_ops.cpu_on(cpu_logical_map(cpu),
                                        virt_to_idmap(&secondary_startup));
#endif
        return -ENODEV;
}

#ifdef CONFIG_HOTPLUG_CPU
static int psci_cpu_disable(unsigned int cpu)
{
        /* Fail early if we don't have CPU_OFF support */
        if (!psci_ops.cpu_off)
                return -EOPNOTSUPP;

        /* Trusted OS will deny CPU_OFF */
        if (psci_tos_resident_on(cpu))
                return -EPERM;

        return 0;
}

static void psci_cpu_die(unsigned int cpu)
{
        u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
                    PSCI_0_2_POWER_STATE_TYPE_SHIFT;

        if (psci_ops.cpu_off)
                psci_ops.cpu_off(state);

        /* We should never return */
        panic("psci: cpu %d failed to shutdown\n", cpu);
}

static int psci_cpu_kill(unsigned int cpu)
{
        int err, i;

        if (!psci_ops.affinity_info)
                return 1;
        /*
         * cpu_kill could race with cpu_die and we can
         * potentially end up declaring this cpu undead
         * while it is dying. So, try again a few times.
         */

        for (i = 0; i < 10; i++) {
                err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
                if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
                        pr_info("CPU%d killed.\n", cpu);
                        return 1;
                }

                msleep(10);
                pr_info("Retrying again to check for CPU kill\n");
        }

        pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
                        cpu, err);
        /* Make platform_cpu_kill() fail. */
        return 0;
}

#endif

bool __init psci_smp_available(void)
{
        /* is cpu_on available at least? */
        return (psci_ops.cpu_on != NULL);
}

const struct smp_operations psci_smp_ops __initconst = {
        .smp_boot_secondary     = psci_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
        .cpu_disable            = psci_cpu_disable,
        .cpu_die                = psci_cpu_die,
        .cpu_kill               = psci_cpu_kill,
#endif
};