/*      $NetBSD: memerr.c,v 1.23 2024/12/20 23:52:00 tsutsui Exp $ */

/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* 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. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
*      @(#)memreg.c    8.1 (Berkeley) 6/11/93
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: memerr.c,v 1.23 2024/12/20 23:52:00 tsutsui Exp $");

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

#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/idprom.h>
#include <machine/pte.h>

#include <sun3/sun3/machdep.h>
#include <sun3/dev/memerr.h>
/* #include <sun3/dev/eccreg.h> - not yet */

#define ME_PRI  7       /* Interrupt level (NMI) */

enum memerr_type { ME_PAR = 0, ME_ECC = 1 };

struct memerr_softc {
       device_t sc_dev;
       struct memerr *sc_reg;
       enum memerr_type sc_type;
       const char *sc_typename;        /* "Parity" or "ECC" */
       const char *sc_csrbits;         /* how to print csr bits */
       /* XXX: counters? */
};

static int  memerr_match(device_t, cfdata_t, void *);
static void memerr_attach(device_t, device_t, void *);
static int  memerr_interrupt(void *);
static void memerr_correctable(struct memerr_softc *);

CFATTACH_DECL_NEW(memerr, sizeof(struct memerr_softc),
   memerr_match, memerr_attach, NULL, NULL);

static int memerr_attached;

static int
memerr_match(device_t parent, cfdata_t cf, void *args)
{
       struct confargs *ca = args;

       /* This driver only supports one instance. */
       if (memerr_attached)
               return 0;

       /* Make sure there is something there... */
       if (bus_peek(ca->ca_bustype, ca->ca_paddr, 1) == -1)
               return 0;

       /* Default interrupt priority. */
       if (ca->ca_intpri == -1)
               ca->ca_intpri = ME_PRI;

       return 1;
}

static void
memerr_attach(device_t parent, device_t self, void *args)
{
       struct memerr_softc *sc = device_private(self);
       struct confargs *ca = args;
       struct memerr *mer;

       sc->sc_dev = self;

       /*
        * Which type of memory subsystem do we have?
        */
       switch (cpu_machine_id) {
       case ID_SUN3_160:               /* XXX: correct? */
       case ID_SUN3_260:
       case ID_SUN3X_470:
               sc->sc_type = ME_ECC;
               sc->sc_typename = "ECC";
               sc->sc_csrbits = ME_ECC_STR;
               break;

       default:
               sc->sc_type = ME_PAR;
               sc->sc_typename = "Parity";
               sc->sc_csrbits = ME_PAR_STR;
               break;
       }
       aprint_normal(": (%s memory)\n", sc->sc_typename);

       mer = bus_mapin(ca->ca_bustype, ca->ca_paddr, sizeof(*mer));
       if (mer == NULL)
               panic("%s: can not map register", device_xname(self));
       sc->sc_reg = mer;

       /* Install interrupt handler. */
       isr_add_autovect(memerr_interrupt, sc, ca->ca_intpri);

       /* Enable error interrupt (and checking). */
       if (sc->sc_type == ME_PAR)
               mer->me_csr = ME_CSR_IENA | ME_PAR_CHECK;
       else {
               /*
                * XXX:  Some day, figure out how to decode
                * correctable errors and set ME_ECC_CE_ENA
                * here so we can log them...
                */
               mer->me_csr = ME_CSR_IENA; /* | ME_ECC_CE_ENA */
       }
       memerr_attached = 1;
}

/*****************************************************************
* Functions for ECC memory
*****************************************************************/

static int
memerr_interrupt(void *arg)
{
       struct memerr_softc *sc = arg;
       volatile struct memerr *me = sc->sc_reg;
       uint8_t csr, ctx;
       u_int pa, va;
       int pte;
       uint8_t bits[64];

       csr = me->me_csr;
       if ((csr & ME_CSR_IPEND) == 0)
               return 0;

       va = me->me_vaddr;
       ctx = (va >> 28) & 0xF;
       va &= 0x0FFFffff;
       pte = get_pte(va);
       pa = PG_PA(pte);

       printf("\nMemory error on %s cycle!\n",
           (ctx & 8) ? "DVMA" : "CPU");
       printf(" ctx=%d, vaddr=0x%x, paddr=0x%x\n",
           (ctx & 7), va, pa);
       snprintb(bits, sizeof(bits), sc->sc_csrbits, csr);
       printf(" csr=%s\n", bits);

       /*
        * If we have parity-checked memory, there is
        * not much to be done.  Any error is fatal.
        */
       if (sc->sc_type == ME_PAR) {
               if (csr & ME_PAR_EMASK) {
                       /* Parity errors are fatal. */
                       goto die;
               }
               /* The IPEND bit was set, but no error bits. */
               goto noerror;
       }

       /*
        * We have ECC memory.  More complicated...
        */
       if (csr & (ME_ECC_WBTMO | ME_ECC_WBERR)) {
               printf(" write-back failed, pte=0x%x\n", pte);
               goto die;
       }
       if (csr & ME_ECC_UE) {
               printf(" uncorrectable ECC error\n");
               goto die;
       }
       if (csr & ME_ECC_CE) {
               /* Just log this and continue. */
               memerr_correctable(sc);
               goto recover;
       }
       /* The IPEND bit was set, but no error bits. */
       goto noerror;

die:
       panic("all bets are off...");

noerror:
       printf("memerr: no error bits set?\n");

recover:
       /* Clear the error by writing the address register. */
       me->me_vaddr = 0;
       return 1;
}

/*
* Announce (and log) a correctable ECC error.
* Need to look at the ECC syndrome register on
* the memory board that caused the error...
*/
void
memerr_correctable(struct memerr_softc *sc)
{

       /* XXX: Not yet... */
}

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