/*      $NetBSD: e500wdog.c,v 1.4 2020/07/06 09:34:16 rin Exp $ */
/*-
* Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
* Agency and which was developed by Matt Thomas of 3am Software Foundry.
*
* This material is based upon work supported by the Defense Advanced Research
* Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
* Contract No. N66001-09-C-2073.
* Approved for Public Release, Distribution Unlimited
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: e500wdog.c,v 1.4 2020/07/06 09:34:16 rin Exp $");

#include "ioconf.h"

#include <sys/param.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/wdog.h>

#include <dev/sysmon/sysmonvar.h>

#include <sys/intr.h>

#include <powerpc/spr.h>
#include <powerpc/booke/spr.h>

#include <powerpc/booke/cpuvar.h>

struct e500wdog_softc {
       device_t sc_dev;
       struct sysmon_wdog sc_smw;
       u_int sc_wdog_period;
       bool sc_wdog_armed;
       uint64_t sc_timebase;
};
#ifndef PQ3WDOG_PERIOD_DEFAULT
#define PQ3WDOG_PERIOD_DEFAULT  10
#endif

static int e500wdog_match(device_t, cfdata_t, void *);
static void e500wdog_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(e500wdog, sizeof(struct e500wdog_softc),
   e500wdog_match, e500wdog_attach, NULL, NULL);

static int
e500wdog_match(device_t parent, cfdata_t cf, void *aux)
{
       struct cpunode_softc * const psc = device_private(parent);
       struct cpunode_attach_args * const cna = aux;
       struct cpunode_locators * const cnl = &cna->cna_locs;

       if (!board_info_get_bool("pq3")
           || cnl->cnl_instance != 0
           || (psc->sc_children & cna->cna_childmask)
           || strcmp(cnl->cnl_name, "wdog") != 0)
               return 0;

       return 1;
}

static int
e500wdog_tickle(struct sysmon_wdog *smw)
{
       mtspr(SPR_TSR, TSR_ENW);
       return 0;
}

static int
e500wdog_setmode(struct sysmon_wdog *smw)
{
       struct e500wdog_softc * const sc = smw->smw_cookie;

       if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
               /*
                * We can't disarm the watchdog.
                */
               if (sc->sc_wdog_armed)
                       return EBUSY;
       } else {
               /*
                * If no changes, don't do anything.
                */
               if (sc->sc_wdog_armed
                   && smw->smw_period == sc->sc_wdog_period) {
                       mtspr(SPR_TSR, TSR_ENW);
                       return 0;
               }
               printf("%s:%d %u %u\n", __func__, __LINE__,
                   sc->sc_wdog_period, smw->smw_period);
               if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
                       sc->sc_wdog_period = PQ3WDOG_PERIOD_DEFAULT;
                       smw->smw_period = PQ3WDOG_PERIOD_DEFAULT;
               }
               mtspr(SPR_TSR, TSR_ENW);
               uint32_t tcr = mfspr(SPR_TCR);
               if (!sc->sc_wdog_armed)
                       tcr = (tcr & ~TCR_WRC) | TCR_WRC_RESET | TCR_WIE;
               const uint64_t period = sc->sc_wdog_period * sc->sc_timebase / 3;
               const u_int wp = __builtin_clz(period) + 1;
               tcr &= ~(TCR_WP|TCR_WPEXT);
               tcr |= __SHIFTIN(wp, TCR_WP) | __SHIFTIN(wp >> 2, TCR_WPEXT);
               mtspr(SPR_TCR, tcr);
               sc->sc_wdog_period =
                    ((1ULL << (63 - wp)) + sc->sc_timebase - 1)
                       / sc->sc_timebase;
               sc->sc_wdog_armed = true;
       }
       return 0;
}

static void
e500wdog_attach(device_t parent, device_t self, void *aux)
{
       struct cpunode_softc * const psc = device_private(parent);
       struct e500wdog_softc * const sc = device_private(self);
       struct cpunode_attach_args * const cna = aux;

       psc->sc_children |= cna->cna_childmask;
       sc->sc_dev = self;

       sc->sc_timebase = board_info_get_number("timebase-frequency");
       const uint32_t tcr = mfspr(SPR_TCR);
       u_int wp = __SHIFTOUT(tcr, TCR_WP) | (__SHIFTOUT(tcr, TCR_WPEXT) << 2);

#if DEBUG > 1
       printf(" tcr=%#x wp=%u", tcr, wp);
       printf(" timebase=%"PRIu64, sc->sc_timebase);
#endif
       sc->sc_wdog_armed = (tcr & TCR_WRC) != 0;
       if (sc->sc_wdog_armed)
               sc->sc_wdog_period = ((1ULL << (63 - wp)) + sc->sc_timebase - 1)
                   / sc->sc_timebase;
       else
               sc->sc_wdog_period = PQ3WDOG_PERIOD_DEFAULT;

       aprint_normal(": default period is %u seconds%s\n",
           sc->sc_wdog_period,
           sc->sc_wdog_armed ? " (wdog is active)" : "");

       sc->sc_smw.smw_name = device_xname(sc->sc_dev);
       sc->sc_smw.smw_cookie = sc;
       sc->sc_smw.smw_setmode = e500wdog_setmode;
       sc->sc_smw.smw_tickle = e500wdog_tickle;
       sc->sc_smw.smw_period = sc->sc_wdog_period;

       if (sysmon_wdog_register(&sc->sc_smw) != 0)
               aprint_error_dev(self, "unable to register with sysmon\n");

#if 1
       if (sc->sc_wdog_armed) {
               int error = sysmon_wdog_setmode(&sc->sc_smw, WDOG_MODE_KTICKLE,
                   sc->sc_wdog_period);
               if (error)
                       aprint_error_dev(self,
                           "failed to start kernel tickler: %d\n", error);
       }
#else
       //mtspr(SPR_TSR, TSR_ENW);
#endif
}

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