// SPDX-License-Identifier: GPL-2.0-only
/*
 * System Specific setup for Soekris net5501
 * At the moment this means setup of GPIO control of LEDs and buttons
 * on net5501 boards.
 *
 * Copyright (C) 2008-2009 Tower Technologies
 * Written by Alessandro Zummo <a.zummo@towertech.it>
 *
 * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
 * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
 *                and Philip Prindeville <philipp@redfish-solutions.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/string.h>
#include <linux/input.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/property.h>

#include <asm/geode.h>

#include "geode-common.h"

#define BIOS_REGION_BASE                0xffff0000
#define BIOS_REGION_SIZE                0x00010000

static const struct geode_led net5501_leds[] __initconst = {
        { 6, true },
};

static void __init register_net5501(void)
{
        geode_create_restart_key(24);
        geode_create_leds("net5501", net5501_leds, ARRAY_SIZE(net5501_leds));
}

struct net5501_board {
        u16     offset;
        u16     len;
        char    *sig;
};

static struct net5501_board __initdata boards[] = {
        { 0xb7b, 7, "net5501" },        /* net5501 v1.33/1.33c */
        { 0xb1f, 7, "net5501" },        /* net5501 v1.32i */
};

static bool __init net5501_present(void)
{
        int i;
        unsigned char *rombase, *bios;
        bool found = false;

        rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
        if (!rombase) {
                printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
                return found;
        }

        bios = rombase + 0x20;  /* null terminated */

        if (memcmp(bios, "comBIOS", 7))
                goto unmap;

        for (i = 0; i < ARRAY_SIZE(boards); i++) {
                unsigned char *model = rombase + boards[i].offset;

                if (!memcmp(model, boards[i].sig, boards[i].len)) {
                        printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
                               KBUILD_MODNAME, model);

                        found = true;
                        break;
                }
        }

unmap:
        iounmap(rombase);
        return found;
}

static int __init net5501_init(void)
{
        if (!is_geode())
                return 0;

        if (!net5501_present())
                return 0;

        register_net5501();

        return 0;
}
device_initcall(net5501_init);