/*      $NetBSD: findcpu.c,v 1.20 2017/05/22 16:39:41 ragge Exp $       */
/*
 * Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: findcpu.c,v 1.20 2017/05/22 16:39:41 ragge Exp $");

#include <sys/param.h>
#ifdef _KERNEL
#include <sys/device.h>
#endif

#include <machine/sid.h>
#include <machine/nexus.h>
#include <machine/mtpr.h>
#include <machine/cpu.h>

/* 
 * We set up some information about the machine we're
 * running on and thus initializes/uses vax_cputype and vax_boardtype.
 * There should be no need to change/reinitialize these variables
 * outside of this routine, they should be read only!
 */
int vax_cputype;        /* highest byte of SID register */
int vax_bustype;        /* holds/defines all busses on this machine */
int vax_boardtype;      /* machine dependent, combination of SID and SIE */
 
int vax_cpudata;        /* contents of the SID register */
int vax_siedata;        /* contents of the SIE register */
int vax_confdata;       /* machine dependent, configuration/setup data */

/*
 * Try to figure out which type of system this is.
 */
void
findcpu(void)
{
        vax_cpudata = mfpr(PR_SID);
        vax_cputype = vax_cpudata >> 24;
        vax_boardtype = vax_cputype << 24;

        switch (vax_cputype) {
        case VAX_TYP_730:
                vax_bustype = VAX_UNIBUS;
                break;
        case VAX_TYP_780:
                vax_bustype = VAX_SBIBUS;
                break;
        case VAX_TYP_750:
                vax_bustype = VAX_CMIBUS;
                break;
        case VAX_TYP_790:
                vax_bustype = VAX_ABUS;
                break;

        case VAX_TYP_UV1:
                vax_bustype = VAX_IBUS;
                break;

        case VAX_TYP_UV2:
        case VAX_TYP_CVAX:
        case VAX_TYP_RIGEL:
        case VAX_TYP_MARIAH:
        case VAX_TYP_NVAX:
        case VAX_TYP_SOC:
                vax_siedata = *(int *)(0x20040004);     /* SIE address */
                vax_boardtype |= vax_siedata >> 24;

                switch (vax_boardtype) {
                case VAX_BTYP_420: /* They are very similar */
                case VAX_BTYP_410:
                case VAX_BTYP_43:
                case VAX_BTYP_46:
                case VAX_BTYP_48:
                case VAX_BTYP_IS1:
                        vax_confdata = *(int *)(0x20020000);
                        vax_bustype = VAX_VSBUS;
                        break;
                case VAX_BTYP_49:
                        vax_confdata = *(int *)(0x25800000);
                        vax_bustype = VAX_VSBUS;
                        break;

                case VAX_BTYP_9CC:
                case VAX_BTYP_9RR:
                case VAX_BTYP_1202:
                case VAX_BTYP_1302:
                        vax_bustype = VAX_XMIBUS;
                        break;

                case VAX_BTYP_670:
                case VAX_BTYP_660:
                case VAX_BTYP_60:
                case VAX_BTYP_680:
                case VAX_BTYP_681:
                case VAX_BTYP_630:
                case VAX_BTYP_650:
                case VAX_BTYP_53:
                        vax_bustype = VAX_IBUS;
                        break;

                }
                break;

        case VAX_TYP_8SS:
                vax_boardtype = VAX_BTYP_8000;
                vax_bustype = VAX_BIBUS;
                break;

        case VAX_TYP_8NN:
                vax_boardtype = VAX_BTYP_8800; /* subversion later */
                vax_bustype = VAX_NMIBUS;
                break;

        case VAX_TYP_8PS:
                vax_boardtype = VAX_BTYP_8PS;
                vax_bustype = VAX_NMIBUS;
                break;

        default:
                /* CPU not supported, just give up */
                __asm("halt");
        }
}