// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP4 SMP cpu-hotplug support
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Author:
 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * Platform file needed for the OMAP4 SMP. This file is based on arm
 * realview smp platform.
 * Copyright (c) 2002 ARM Limited.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/io.h>

#include "omap-wakeupgen.h"
#include "common.h"
#include "powerdomain.h"

/*
 * platform-specific code to shutdown a CPU
 * Called with IRQs disabled
 */
void omap4_cpu_die(unsigned int cpu)
{
        unsigned int boot_cpu = 0;
        void __iomem *base = omap_get_wakeupgen_base();

        /*
         * we're ready for shutdown now, so do it
         */
        if (omap_secure_apis_support()) {
                if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
                        pr_err("Secure clear status failed\n");
        } else {
                writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
        }


        for (;;) {
                /*
                 * Enter into low power state
                 */
                omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);

                if (omap_secure_apis_support())
                        boot_cpu = omap_read_auxcoreboot0() >> 9;
                else
                        boot_cpu =
                                readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;

                if (boot_cpu == smp_processor_id()) {
                        /*
                         * OK, proper wakeup, we're done
                         */
                        break;
                }
                pr_debug("CPU%u: spurious wakeup call\n", cpu);
        }
}

/* Needed by kexec and platform_can_cpu_hotplug() */
int omap4_cpu_kill(unsigned int cpu)
{
        return 1;
}