/*      $NetBSD: weasel_isa.c,v 1.6 2015/08/20 14:40:18 christos Exp $  */

/*-
* Copyright (c) 2000 Zembu Labs, Inc.
* All rights reserved.
*
* Author: Jason R. Thorpe <[email protected]>
*
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Zembu Labs, Inc.
* 4. Neither the name of Zembu Labs nor the names of its employees may
*    be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
* RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
* CLAIMED.  IN NO EVENT SHALL ZEMBU LABS 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.
*/

/*
* Device driver for the Middle Digital, Inc. PC-Weasel serial
* console board.
*
* We're glued into the MDA display driver (`pcdisplay'), and
* handle things like the watchdog timer.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: weasel_isa.c,v 1.6 2015/08/20 14:40:18 christos Exp $");

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

#include <sys/bus.h>

#include <dev/isa/weaselreg.h>
#include <dev/isa/weaselvar.h>

#include <dev/sysmon/sysmonvar.h>

#include "ioconf.h"

int     weasel_isa_wdog_setmode(struct sysmon_wdog *);
int     weasel_isa_wdog_tickle(struct sysmon_wdog *);
int     weasel_isa_wdog_arm_disarm(struct weasel_handle *, u_int8_t);
int     weasel_isa_wdog_query_state(struct weasel_handle *);


/* ARGSUSED */
void
pcweaselattach(int count)
{

       /* Nothing to do; pseudo-device glue. */
}

void
weasel_isa_init(struct weasel_handle *wh)
{
       struct weasel_config_block cfg;
       int i, j;
       u_int8_t *cp, sum;
       const char *vers, *mode;

       /*
        * Write a NOP to the command register and see if it
        * reverts back to READY within 1.5 seconds.
        */
       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND, OS_NOP);
       for (i = 0; i < 1500; i++) {
               delay(1000);
               sum = bus_space_read_1(wh->wh_st, wh->wh_sh,
                   WEASEL_MISC_COMMAND);
               if (sum == OS_READY)
                       break;
       }
       if (sum != OS_READY) {
               /* This is not a Weasel. */
               return;
       }

       /*
        * It can take a while for the config block to be copied
        * into the offscreen area, as the Weasel may be busy
        * sending data to the terminal.  Wait up to 3 seconds,
        * reading the block each time, and breaking out of the
        * loop once the checksum passes.
        */

       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND,
           OS_CONFIG_COPY);

       /* ...one second to get it started... */
       delay(1000 * 1000);

       /* ...two seconds to let it finish... */
       for (i = 0; i < 2000; i++) {
               delay(1000);
               bus_space_read_region_1(wh->wh_st, wh->wh_sh,
                   WEASEL_CONFIG_BLOCK, &cfg, sizeof(cfg));
               /*
                * Compute the checksum of the config block.
                */
               for (cp = (u_int8_t *)&cfg, j = 0, sum = 1;
                    j < (sizeof(cfg) - 1); j++)
                       sum += cp[j];
               if (sum == cfg.cksum)
                       break;
       }

       if (sum != cfg.cksum) {
               /*
                * Checksum doesn't match; either it's not a Weasel,
                * or something is wrong with it.
                */
               printf("%s: PC-Weasel config block checksum mismatch "
                   "0x%02x != 0x%02x\n", device_xname(wh->wh_parent),
                   sum, cfg.cksum);
               return;
       }

       switch (cfg.cfg_version) {
       case CFG_VERSION_1_0:
               vers = "1.0";
               switch (cfg.enable_duart_switching) {
               case 0:
                       mode = "emulation";
                       break;

               case 1:
                       mode = "autoswitch";
                       break;

               default:
                       mode = "unknown";
               }
               break;

       case CFG_VERSION_1_1:
               vers = "1.1";
               switch (cfg.enable_duart_switching) {
               case 0:
                       mode = "emulation";
                       break;

               case 1:
                       mode = "serial";
                       break;

               case 2:
                       mode = "autoswitch";
                       break;

               default:
                       mode = "unknown";
               }
               break;

       default:
               vers = mode = NULL;
       }

       printf("%s: PC-Weasel, ", device_xname(wh->wh_parent));
       if (vers != NULL)
               printf("version %s, %s mode", vers, mode);
       else
               printf("unknown version 0x%x", cfg.cfg_version);
       printf("\n");

       printf("%s: break passthrough %s", device_xname(wh->wh_parent),
           cfg.break_passthru ? "enabled" : "disabled");
       if (cfg.wdt_msec == 0) {
               /*
                * Old firmware -- these Weasels have
                * a 3000ms watchdog period.
                */
               cfg.wdt_msec = 3000;
       }

       if ((wh->wh_wdog_armed = weasel_isa_wdog_query_state(wh)) == -1)
               wh->wh_wdog_armed = 0;
       wh->wh_wdog_period = cfg.wdt_msec / 1000;

       printf(", watchdog interval %d sec.\n", wh->wh_wdog_period);

       /*
        * Always register the Weasel watchdog timer in case user decides
        * to set 'allow watchdog' to 'YES' after the machine has booted.
        */
       wh->wh_smw.smw_name = "weasel";
       wh->wh_smw.smw_cookie = wh;
       wh->wh_smw.smw_setmode = weasel_isa_wdog_setmode;
       wh->wh_smw.smw_tickle = weasel_isa_wdog_tickle;
       wh->wh_smw.smw_period = wh->wh_wdog_period;

       if (sysmon_wdog_register(&wh->wh_smw) != 0)
               aprint_error_dev(wh->wh_parent, "unable to register PC-Weasel watchdog "
                   "with sysmon\n");
}

int
weasel_isa_wdog_setmode(struct sysmon_wdog *smw)
{
       struct weasel_handle *wh = smw->smw_cookie;
       int error = 0;

       if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
               error = weasel_isa_wdog_arm_disarm(wh, WDT_DISABLE);
       } else {
               if (smw->smw_period == WDOG_PERIOD_DEFAULT)
                       smw->smw_period = wh->wh_wdog_period;
               else if (smw->smw_period != wh->wh_wdog_period) {
                       /* Can't change the period on the Weasel. */
                       return (EINVAL);
               }
               error = weasel_isa_wdog_arm_disarm(wh, WDT_ENABLE);
               weasel_isa_wdog_tickle(smw);
       }

       return (error);
}

int
weasel_isa_wdog_tickle(struct sysmon_wdog *smw)
{
       struct weasel_handle *wh = smw->smw_cookie;
       u_int8_t reg;
       int x;
       int s;
       int error = 0;

       s = splhigh();
       /*
        * first we tickle the watchdog
        */
       reg = bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE);
       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE, ~reg);

       /*
        * then we check to make sure the weasel is still armed. If someone
        * has rebooted the weasel for whatever reason (firmware update),
        * then the watchdog timer would no longer be armed and we'd be
        * servicing nothing. Let the user know that the machine is no
        * longer being monitored by the weasel.
        */
       if((x = weasel_isa_wdog_query_state(wh)) == -1)
               error = EIO;
       if (x == 1) {
               error = 0;
       } else {
               aprint_error_dev(wh->wh_parent, "Watchdog timer disabled on PC/Weasel! Disarming wdog.\n");
               wh->wh_wdog_armed = 0;
               error = 1;
       }
       splx(s);

       return (error);
}

int
weasel_isa_wdog_arm_disarm(struct weasel_handle *wh, u_int8_t mode)
{
       u_int8_t reg;
       int timeout;
       int s, x;
       int error = 0;

       s = splhigh();

       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE,
               WDT_ATTENTION);
       for (timeout = 5000; timeout; timeout--) {
               delay(1500);
               reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
                       WEASEL_WDT_SEMAPHORE);
               if (reg == WDT_OK)
                       break;
       }
       if (timeout == 0) {
               splx(s);
               return(EIO);
       }
       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, mode);
       for (timeout = 500 ; timeout; timeout--) {
               delay(1500);
               reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
                       WEASEL_WDT_SEMAPHORE);
               if (reg != mode)
                       break;
       }
       if (timeout == 0) {
               splx(s);
               return(EIO);
       }
       bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, ~reg);
       for (timeout = 500; timeout; timeout--) {
               delay(1500);
               reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
                       WEASEL_WDT_SEMAPHORE);
               if (reg == WDT_OK)
                       break;
       }

       /*
        * Ensure that the Weasel thinks it's in the same mode we want it to
        * be in.   EIO if not.
        */
       x = weasel_isa_wdog_query_state(wh);
       switch (x) {
               case -1:
                       error = EIO;
                       break;
               case 0:
                       if (mode == WDT_DISABLE) {
                               wh->wh_wdog_armed = 0;
                               error = 0;
                       } else
                               error = EIO;
                       break;
               case 1:
                       if (mode == WDT_ENABLE) {
                               wh->wh_wdog_armed = 1;
                               error = 0;
                       } else
                               error = EIO;
                       break;
       }

       splx(s);
       return(error);
}

int
weasel_isa_wdog_query_state(struct weasel_handle *wh)
{
       int timeout, reg;

       bus_space_write_1(wh->wh_st, wh->wh_sh,
               WEASEL_MISC_COMMAND, OS_WDT_QUERY);
       for (timeout = 0; timeout < 1500; timeout++) {
               delay(1000);
               reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
                       WEASEL_MISC_COMMAND);
               if (reg == OS_READY)
                       break;
       }
       return(bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_RESPONSE));
}

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