// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * arch/xtensa/platform-iss/setup.c
 *
 * Platform specific initialization.
 *
 * Authors: Chris Zankel <chris@zankel.net>
 *          Joe Taylor <joe@tensilica.com>
 *
 * Copyright 2001 - 2005 Tensilica Inc.
 * Copyright 2017 Cadence Design Systems Inc.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/panic_notifier.h>
#include <linux/printk.h>
#include <linux/reboot.h>
#include <linux/string.h>

#include <asm/platform.h>
#include <asm/setup.h>

#include <platform/simcall.h>


static int iss_power_off(struct sys_off_data *unused)
{
        pr_info(" ** Called platform_power_off() **\n");
        simc_exit(0);
        return NOTIFY_DONE;
}

static int iss_restart(struct notifier_block *this,
                       unsigned long event, void *ptr)
{
        /* Flush and reset the mmu, simulate a processor reset, and
         * jump to the reset vector. */
        cpu_reset();

        return NOTIFY_DONE;
}

static struct notifier_block iss_restart_block = {
        .notifier_call = iss_restart,
};

static int
iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
        simc_exit(1);
        return NOTIFY_DONE;
}

static struct notifier_block iss_panic_block = {
        .notifier_call = iss_panic_event,
};

void __init platform_setup(char **p_cmdline)
{
        static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
        static char cmdline[COMMAND_LINE_SIZE] __initdata;
        int argc = simc_argc();
        int argv_size = simc_argv_size();

        if (argc > 1) {
                if (argv_size > sizeof(argv)) {
                        pr_err("%s: command line too long: argv_size = %d\n",
                               __func__, argv_size);
                } else {
                        int i;

                        cmdline[0] = 0;
                        simc_argv((void *)argv);

                        for (i = 1; i < argc; ++i) {
                                if (i > 1)
                                        strcat(cmdline, " ");
                                strcat(cmdline, argv[i]);
                        }
                        *p_cmdline = cmdline;
                }
        }

        atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
        register_restart_handler(&iss_restart_block);
        register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
                                 SYS_OFF_PRIO_PLATFORM,
                                 iss_power_off, NULL);
}