/*	$NetBSD$	*/

/*
 * Copyright (C) 2001 WIDE Project.  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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */

/*
 * Device driver for JUMPtec watchdog timer BIOS, as well as LAMB LEDs.
 * http://www.jumptec.de/
 */

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

#include <machine/bus.h>
#include <machine/bioscall.h>

#include <dev/isa/isavar.h>
#include <dev/sysmon/sysmonvar.h>

struct jumptec_softc {
	struct device sc_dev;
	struct sysmon_wdog sc_smw;
	u_int16_t sc_period;
	u_int8_t sc_lastarm;
};

int jumptecmatch __P((struct device *, struct cfdata *, void *));
void jumptecattach __P((struct device *, struct device *, void *));
int	jumptec_wdog_setmode(struct sysmon_wdog *);
int	jumptec_wdog_tickle(struct sysmon_wdog *);
int	jumptec_wdog_arm_disarm(struct jumptec_softc *, u_int8_t);

struct cfattach jumptec_ca = {
	sizeof(struct jumptec_softc), jumptecmatch, jumptecattach
};

/* ARGSUSED */
int
jumptecmatch(struct device *parent, struct cfdata *match, void *aux)
{
	struct isa_attach_args *ia = aux;
	struct bioscallregs regs;

	/* is it a JUMPtec device?  XXX API abuse */
	regs.AX = 0xea01;	/* Get manufacturing date */
	regs.CL = 0x00;		/* default device */
	regs.DX = 0x4648;	/* magic */
	bioscall(0x15, &regs);
	if (regs.DX != 0x6b6f)	/* did we get the magic number? */
		return 0;

	ia->ia_iosize = 3;
	ia->ia_msize = 0;

	return 1;
}

void
jumptecattach(struct device *parent, struct device *self, void *aux)
{
	struct jumptec_softc *sc = (struct jumptec_softc *)self;

	printf(": JUMPtec watchdog timer\n");

	/*
	 * Register the Weasel watchdog timer in case user decides
	 * to set 'allow watchdog' to 'YES' after the machine has booted.
	 */
	sc->sc_smw.smw_name = "jumptec";
	sc->sc_smw.smw_cookie = sc;
	sc->sc_smw.smw_setmode = jumptec_wdog_setmode;
	sc->sc_smw.smw_tickle = jumptec_wdog_tickle;
	sc->sc_smw.smw_period = 1;	/* 1sec */

	if (sysmon_wdog_register(&sc->sc_smw) != 0)
		printf("%s: unable to register JUMPtec watchdog with sysmon\n",
		    sc->sc_dev.dv_xname);

	return;
}

int
jumptec_wdog_setmode(struct sysmon_wdog *smw)
{
	struct jumptec_softc *sc = (struct jumptec_softc *)smw->smw_cookie;
	int error = 0;
	int i;

	printf("setmode\n");

	if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED)
		error = jumptec_wdog_arm_disarm(sc, 0);
	else {
		switch (smw->smw_period) {
		case WDOG_PERIOD_DEFAULT:
			smw->smw_period = 1;	/* 1sec */
			/* FALLTHROUGH */
		case 1: case 2: case 4: case 8: case 16: case 32:
			for (i = 1; (1 << (i - 1)) < smw->smw_period; i++)
				;
			break;
		default:
			/* Unsupported period */
			printf("period %u unsupp\n", smw->smw_period);
			return EINVAL;
		}
		error = jumptec_wdog_arm_disarm(sc, i);
		if (!error)
			jumptec_wdog_tickle(smw);
	}

	return (error);
}

int
jumptec_wdog_tickle(struct sysmon_wdog *smw)
{
	struct jumptec_softc *sc = (struct jumptec_softc *)smw->smw_cookie;
	struct bioscallregs regs;

	if (!sc->sc_lastarm) {
		printf("no arm no tickle\n");
		return 0;
	}

	printf("tickle\n");
	memset(&regs, 0, sizeof(regs));
	regs.AX = 0xe001;	/* Watchdog trigger */

#if 0 /* kernel panic */
	bioscall(0x15, &regs);
#endif

	printf("tickle done\n");

	return 0;
}

int
jumptec_wdog_arm_disarm(struct jumptec_softc *sc, u_int8_t mode)
{
	struct bioscallregs regs;

	printf("arm %u\n", mode);

	memset(&regs, 0, sizeof(regs));
	regs.AX = 0xe000;	/* Watchdog init */
	regs.BH = 0x00;
	regs.BL = mode;		/* 0: off, otherwise 2^(BL - 1) sec */
	regs.DX = 0x00;		/* reset if armed */

#if 0 /* kernel panic */
	bioscall(0x15, &regs);
#endif

	printf("arm done\n");
	sc->sc_lastarm = mode;

	return 0;
}