// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
 *
 * Based on reduced version of METAG
 */


#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <asm/mach_desc.h>
#include <asm/serial.h>

#ifdef CONFIG_SERIAL_EARLYCON

static unsigned int __initdata arc_base_baud;

unsigned int __init arc_early_base_baud(void)
{
        return arc_base_baud/16;
}

static void __init arc_set_early_base_baud(unsigned long dt_root)
{
        if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
                arc_base_baud = 166666666;      /* Fixed 166.6MHz clk (TB10x) */
        else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp") ||
                 of_flat_dt_is_compatible(dt_root, "snps,hsdk"))
                arc_base_baud = 33333333;       /* Fixed 33MHz clk (AXS10x & HSDK) */
        else
                arc_base_baud = 50000000;       /* Fixed default 50MHz */
}
#else
#define arc_set_early_base_baud(dt_root)
#endif

static const void * __init arch_get_next_mach(const char *const **match)
{
        static const struct machine_desc *mdesc = __arch_info_begin;
        const struct machine_desc *m = mdesc;

        if (m >= __arch_info_end)
                return NULL;

        mdesc++;
        *match = m->dt_compat;
        return m;
}

/**
 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
 * @dt:         virtual address pointer to dt blob
 *
 * If a dtb was passed to the kernel, then use it to choose the correct
 * machine_desc and to setup the system.
 */
const struct machine_desc * __init setup_machine_fdt(void *dt)
{
        const struct machine_desc *mdesc;
        unsigned long dt_root;

        if (!early_init_dt_scan(dt, __pa(dt)))
                return NULL;

        mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
        if (!mdesc)
                machine_halt();

        dt_root = of_get_flat_dt_root();
        arc_set_early_base_baud(dt_root);

        return mdesc;
}