// SPDX-License-Identifier: GPL-2.0
/*
 * identify.c: machine identification code.
 *
 * Copyright (C) 1998 Harald Koerfgen and Paul M. Antoine
 * Copyright (C) 2002, 2003, 2004, 2005  Maciej W. Rozycki
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mc146818rtc.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/types.h>

#include <asm/bootinfo.h>

#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/kn01.h>
#include <asm/dec/kn02.h>
#include <asm/dec/kn02ba.h>
#include <asm/dec/kn02ca.h>
#include <asm/dec/kn03.h>
#include <asm/dec/kn230.h>
#include <asm/dec/prom.h>
#include <asm/dec/system.h>

#include "dectypes.h"

static const char *dec_system_strings[] = {
        [MACH_DSUNKNOWN]        "unknown DECstation",
        [MACH_DS23100]          "DECstation 2100/3100",
        [MACH_DS5100]           "DECsystem 5100",
        [MACH_DS5000_200]       "DECstation 5000/200",
        [MACH_DS5000_1XX]       "DECstation 5000/1xx",
        [MACH_DS5000_XX]        "Personal DECstation 5000/xx",
        [MACH_DS5000_2X0]       "DECstation 5000/2x0",
        [MACH_DS5400]           "DECsystem 5400",
        [MACH_DS5500]           "DECsystem 5500",
        [MACH_DS5800]           "DECsystem 5800",
        [MACH_DS5900]           "DECsystem 5900",
};

const char *get_system_type(void)
{
#define STR_BUF_LEN     64
        static char system[STR_BUF_LEN];
        static int called = 0;

        if (called == 0) {
                called = 1;
                snprintf(system, STR_BUF_LEN, "Digital %s",
                         dec_system_strings[mips_machtype]);
        }

        return system;
}


/*
 * Setup essential system-specific memory addresses.  We need them
 * early.  Semantically the functions belong to prom/init.c, but they
 * are compact enough we want them inlined. --macro
 */
volatile u8 *dec_rtc_base;

EXPORT_SYMBOL(dec_rtc_base);

static inline void prom_init_kn01(void)
{
        dec_kn_slot_base = KN01_SLOT_BASE;
        dec_kn_slot_size = KN01_SLOT_SIZE;

        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN01_RTC);
}

static inline void prom_init_kn230(void)
{
        dec_kn_slot_base = KN01_SLOT_BASE;
        dec_kn_slot_size = KN01_SLOT_SIZE;

        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN01_RTC);
}

static inline void prom_init_kn02(void)
{
        dec_kn_slot_base = KN02_SLOT_BASE;
        dec_kn_slot_size = KN02_SLOT_SIZE;
        dec_tc_bus = 1;

        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN02_RTC);
}

static inline void prom_init_kn02xa(void)
{
        dec_kn_slot_base = KN02XA_SLOT_BASE;
        dec_kn_slot_size = IOASIC_SLOT_SIZE;
        dec_tc_bus = 1;

        ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);
}

static inline void prom_init_kn03(void)
{
        dec_kn_slot_base = KN03_SLOT_BASE;
        dec_kn_slot_size = IOASIC_SLOT_SIZE;
        dec_tc_bus = 1;

        ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);
}


void __init prom_identify_arch(u32 magic)
{
        unsigned char dec_cpunum, dec_firmrev, dec_etc, dec_systype;
        u32 dec_sysid;

        if (!prom_is_rex(magic)) {
                dec_sysid = simple_strtoul(prom_getenv("systype"),
                                           (char **)0, 0);
        } else {
                dec_sysid = rex_getsysid();
                if (dec_sysid == 0) {
                        printk("Zero sysid returned from PROM! "
                               "Assuming a PMAX-like machine.\n");
                        dec_sysid = 1;
                }
        }

        dec_cpunum = (dec_sysid & 0xff000000) >> 24;
        dec_systype = (dec_sysid & 0xff0000) >> 16;
        dec_firmrev = (dec_sysid & 0xff00) >> 8;
        dec_etc = dec_sysid & 0xff;

        /*
         * FIXME: This may not be an exhaustive list of DECStations/Servers!
         * Put all model-specific initialisation calls here.
         */
        switch (dec_systype) {
        case DS2100_3100:
                mips_machtype = MACH_DS23100;
                prom_init_kn01();
                break;
        case DS5100:            /* DS5100 MIPSMATE */
                mips_machtype = MACH_DS5100;
                prom_init_kn230();
                break;
        case DS5000_200:        /* DS5000 3max */
                mips_machtype = MACH_DS5000_200;
                prom_init_kn02();
                break;
        case DS5000_1XX:        /* DS5000/100 3min */
                mips_machtype = MACH_DS5000_1XX;
                prom_init_kn02xa();
                break;
        case DS5000_2X0:        /* DS5000/240 3max+ or DS5900 bigmax */
                mips_machtype = MACH_DS5000_2X0;
                prom_init_kn03();
                if (!(ioasic_read(IO_REG_SIR) & KN03_IO_INR_3MAXP))
                        mips_machtype = MACH_DS5900;
                break;
        case DS5000_XX:         /* Personal DS5000/xx maxine */
                mips_machtype = MACH_DS5000_XX;
                prom_init_kn02xa();
                break;
        case DS5800:            /* DS5800 Isis */
                mips_machtype = MACH_DS5800;
                break;
        case DS5400:            /* DS5400 MIPSfair */
                mips_machtype = MACH_DS5400;
                break;
        case DS5500:            /* DS5500 MIPSfair-2 */
                mips_machtype = MACH_DS5500;
                break;
        default:
                mips_machtype = MACH_DSUNKNOWN;
                break;
        }

        if (mips_machtype == MACH_DSUNKNOWN)
                printk("This is an %s, id is %x\n",
                       dec_system_strings[mips_machtype], dec_systype);
        else
                printk("This is a %s\n", dec_system_strings[mips_machtype]);
}