// SPDX-License-Identifier: GPL-2.0
/*
 * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
 *
 * Copyright (C) 2010  Magnus Damm
 * Copyright (C) 2010  Takashi Yoshii
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/delay.h>

#include <asm/smp_plat.h>

#include "common.h"
#include "sh73a0.h"

#define CPG_BASE2       0xe6151000
#define WUPCR           0x10    /* System-CPU Wake Up Control Register */
#define SRESCR          0x18    /* System-CPU Software Reset Control Register */
#define PSTR            0x40    /* System-CPU Power Status Register */

#define SYSC_BASE       0xe6180000
#define SBAR            0x20    /* SYS Boot Address Register */

#define AP_BASE         0xe6f10000
#define APARMBAREA      0x20    /* Address Translation Area Register */

#define SH73A0_SCU_BASE 0xf0000000

static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
        unsigned int lcpu = cpu_logical_map(cpu);
        void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);

        if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
                writel(1 << lcpu, cpg2 + WUPCR);        /* wake up */
        else
                writel(1 << lcpu, cpg2 + SRESCR);       /* reset */
        iounmap(cpg2);
        return 0;
}

static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
{
        void __iomem *ap, *sysc;

        if (!request_mem_region(0, SZ_4K, "Boot Area")) {
                pr_err("Failed to request boot area\n");
                return;
        }

        /* Map the reset vector (in headsmp.S) */
        ap = ioremap(AP_BASE, PAGE_SIZE);
        sysc = ioremap(SYSC_BASE, PAGE_SIZE);
        writel(0, ap + APARMBAREA);      /* 4k */
        writel(__pa(shmobile_boot_vector), sysc + SBAR);
        iounmap(sysc);
        iounmap(ap);

        /* setup sh73a0 specific SCU bits */
        shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
}

const struct smp_operations sh73a0_smp_ops __initconst = {
        .smp_prepare_cpus       = sh73a0_smp_prepare_cpus,
        .smp_boot_secondary     = sh73a0_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
        .cpu_can_disable        = shmobile_smp_cpu_can_disable,
        .cpu_die                = shmobile_smp_scu_cpu_die,
        .cpu_kill               = shmobile_smp_scu_cpu_kill,
#endif
};