/*      $NetBSD: ka53.c,v 1.17 2017/05/22 16:46:15 ragge Exp $  */
/*
 * Copyright (c) 2002 Hugh Graham.
 * Copyright (c) 2000 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * 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.
 */

/*
 * Done by Michael Kukat (michael@unixiron.org)
 * Thanx for the good cooperation with Hugh Graham (hugh@openbsd.org)
 * and his useful hints for the console of these machines
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ka53.c,v 1.17 2017/05/22 16:46:15 ragge Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/kernel.h>

#include <machine/clock.h>
#include <machine/scb.h>
#include <machine/sid.h>

static void    ka53_conf(void);
static void    ka53_memerr(void);
static int     ka53_mchk(void *);
static void    ka53_softmem(void *);
static void    ka53_hardmem(void *);
static void    ka53_steal_pages(void);
static void    ka53_cache_enable(void);
static void    ka53_attach_cpu(device_t);

static const char * const ka53_devs[] = { "cpu", "sgec", "vsbus", "uba", NULL };

/* 
 * Declaration of 53-specific calls.
 */
const struct cpu_dep ka53_calls = {
        .cpu_steal_pages = ka53_steal_pages,
        .cpu_mchk       = ka53_mchk,
        .cpu_memerr     = ka53_memerr, 
        .cpu_conf       = ka53_conf,
        .cpu_gettime    = generic_gettime,
        .cpu_settime    = generic_settime,
        .cpu_vups       = 32,    /* ~VUPS */
        .cpu_scbsz      = 2,    /* SCB pages */
        .cpu_halt       = generic_halt,
        .cpu_reboot     = generic_reboot,
        .cpu_flags      = CPU_RAISEIPL,
        .cpu_devs       = ka53_devs,
        .cpu_attach_cpu = ka53_attach_cpu,
};

void
ka53_conf(void)
{

        /* Don't ask why, but we seem to need this... */
        volatile int *hej = (void *)mfpr(PR_ISP);
        *hej = *hej;
        hej[-1] = hej[-1];

        cpmbx = (struct cpmbx *)vax_map_physmem(0x20140400, 1);
}

void
ka53_attach_cpu(device_t self)
{
        const char *cpuname;

        switch((vax_siedata & 0xff00) >> 8) {
                case VAX_STYP_51: cpuname = "KA51"; break;
                case VAX_STYP_52: cpuname = "KA52"; break;
                case VAX_STYP_53: cpuname = "KA53,54,57"; break;
                case VAX_STYP_55: cpuname = "KA55"; break;
                default: cpuname = "unknown NVAX";
        }
        printf("cpu0: %s, ucode rev %d\n", cpuname, vax_cpudata & 0xff);
}

/*
 * Why may we get memory errors during startup???
 */

void
ka53_hardmem(void *arg)
{
        if (cold == 0)
                printf("Hard memory error\n");
        splhigh();
}

void
ka53_softmem(void *arg)
{
        if (cold == 0)
                printf("Soft memory error\n");
        splhigh();
}

/*
 * KA53-specific IPRs. KA53 has the funny habit to control all caches
 * via IPRs.
 */
#define PR_CCTL  0xa0
#define CCTL_ENABLE     0x00000001
#define CCTL_SW_ETM     0x40000000
#define CCTL_HW_ETM     0x80000000

#define PR_BCETSTS      0xa3
#define PR_BCEDSTS      0xa6
#define PR_NESTS        0xae

#define PR_VMAR  0xd0
#define PR_VTAG  0xd1
#define PR_ICSR  0xd3
#define ICSR_ENABLE     0x01

#define PR_PCCTL        0xf8
#define PCCTL_P_EN      0x10
#define PCCTL_I_EN      0x02
#define PCCTL_D_EN      0x01

void
ka53_cache_enable(void)
{
        int start, slut;

        /*
         * Turn caches off.
         */
        mtpr(0, PR_ICSR);
        mtpr(0, PR_PCCTL);
        mtpr(mfpr(PR_CCTL) | CCTL_SW_ETM, PR_CCTL);

        /*
         * Invalidate caches.
         */
        mtpr(mfpr(PR_CCTL) | 6, PR_CCTL);       /* Set cache size and speed */
        mtpr(mfpr(PR_BCETSTS), PR_BCETSTS);     /* Clear error bits */
        mtpr(mfpr(PR_BCEDSTS), PR_BCEDSTS);     /* Clear error bits */
        mtpr(mfpr(PR_NESTS), PR_NESTS);  /* Clear error bits */


        start = 0x01400000;
        slut  = 0x01420000;

        /* Flush cache lines */
        for (; start < slut; start += 0x20)
                mtpr(0, start);

        mtpr((mfpr(PR_CCTL) & ~(CCTL_SW_ETM|CCTL_ENABLE)) | CCTL_HW_ETM,
            PR_CCTL);

        start = 0x01000000;
        slut  = 0x01020000;

        /* clear tag and valid */
        for (; start < slut; start += 0x20)
                mtpr(0, start);

        mtpr(mfpr(PR_CCTL) | 6 | CCTL_ENABLE, PR_CCTL); /* enab. bcache */

        start = 0x01800000;
        slut  = 0x01802000;

        /* Clear primary cache */
        for (; start < slut; start += 0x20)
                mtpr(0, start);

        /* Flush the pipes (via REI) */
        __asm("movpsl -(%sp); movab 1f,-(%sp); rei; 1:;");

        /* Enable primary cache */
        mtpr(PCCTL_P_EN|PCCTL_I_EN|PCCTL_D_EN, PR_PCCTL);

        /* Enable the VIC */
        start = 0;
        slut  = 0x800;
        for (; start < slut; start += 0x20) {
                mtpr(start, PR_VMAR);
                mtpr(0, PR_VTAG);
        }
        mtpr(ICSR_ENABLE, PR_ICSR);
}

void
ka53_memerr(void)
{
        printf("Memory err!\n");
}

int
ka53_mchk(void *addr)
{
        mtpr(0x00, PR_MCESR);
        printf("Machine Check\n");
        return 0;
}

void
ka53_steal_pages(void)
{

        /*
         * Get the soft and hard memory error vectors now.
         */

        scb_vecalloc(0x54, ka53_softmem, NULL, 0, NULL);
        scb_vecalloc(0x60, ka53_hardmem, NULL, 0, NULL);


        /* Turn on caches (to speed up execution a bit) */
        ka53_cache_enable();
}