/*	$OpenBSD: frodo.c,v 1.1 1997/07/06 08:01:50 downsj Exp $	*/
/*	$NetBSD: frodo.c,v 1.1 1997/05/12 08:03:48 thorpej Exp $	*/

/*
 * Copyright (c) 1997 Jason R. Thorpe.  All rights reserved.
 * Copyright (c) 1997 Michael Smith.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

/*
 * Support for the "Frodo" (a.k.a. "Apollo Utility") chip found
 * in HP Apollo 9000/4xx workstations.
 */

#define	_HP300_INTR_H_PRIVATE

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

#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/hp300spu.h>

#include <hp300/dev/intiovar.h>

#include <hp300/dev/frodoreg.h>
#include <hp300/dev/frodovar.h>

/*
 * Description of a Frodo interrupt handler.
 */
struct frodo_isr {
	int	(*isr_func) __P((void *));
	void	*isr_arg;
	int	isr_priority;
};

struct frodo_softc {
	struct device	sc_dev;		/* generic device glue */
	volatile u_int8_t *sc_regs;	/* register base */
	struct frodo_isr sc_intr[FRODO_NINTR]; /* interrupt handlers */
	void		*sc_ih;		/* out interrupt cookie */
	int		sc_refcnt;	/* number of interrupt refs */
};

int	frodomatch __P((struct device *, void *, void *));
void	frodoattach __P((struct device *, struct device *, void *));

int	frodoprint __P((void *, const char *));
int	frodosubmatch __P((struct device *, void *, void *));

int	frodointr __P((void *));

void	frodo_imask __P((struct frodo_softc *, u_int16_t, u_int16_t));

struct cfattach frodo_ca = {
	sizeof(struct frodo_softc), frodomatch, frodoattach
};

struct cfdriver frodo_cd = {
	NULL, "frodo", DV_DULL
};

struct frodo_attach_args frodo_subdevs[] = {
	{ "dnkbd",	FRODO_APCI_OFFSET(0),	FRODO_INTR_APCI0 },
	{ "apci",	FRODO_APCI_OFFSET(1),	FRODO_INTR_APCI1 },
	{ "apci",	FRODO_APCI_OFFSET(2),	FRODO_INTR_APCI2 },
	{ "apci",	FRODO_APCI_OFFSET(3),	FRODO_INTR_APCI3 },
	{ NULL,		0,			0 },
};

int
frodomatch(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct intio_attach_args *ia = aux;
	caddr_t va;
	static int frodo_matched = 0;

	/* only allow one instance */
	if (frodo_matched)
		return (0);

	/* only 4xx workstations can have this */
	switch (machineid) {
	case HP_400:
	case HP_425:
	case HP_433:
		break;

	default:
		return (0);
	}

	/* make sure the hardware is there in any case */
	va = (caddr_t)IIOV(FRODO_BASE);
	if (badaddr(va))
		return (0);

	frodo_matched = 1;
	ia->ia_addr = va;
	return (1);
}

void
frodoattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct frodo_softc *sc = (struct frodo_softc *)self;
	struct intio_attach_args *ia = aux;
	int i;

	sc->sc_regs = (volatile u_int8_t *)ia->ia_addr;

	if ((FRODO_READ(sc, FRODO_IISR) & FRODO_IISR_SERVICE) == 0)
		printf(": service mode enabled");
	printf("\n");

	/* Clear all of the interrupt handlers. */
	bzero(sc->sc_intr, sizeof(sc->sc_intr));
	sc->sc_refcnt = 0;

	/*
	 * Disable all of the interrupt lines; we reenable them
	 * as subdevices attach.
	 */
	frodo_imask(sc, 0, 0xffff);

	/* Clear any pending interrupts. */
	FRODO_WRITE(sc, FRODO_PIC_PU, 0xff);
	FRODO_WRITE(sc, FRODO_PIC_PL, 0xff);

	/* Set interrupt polarities. */
	FRODO_WRITE(sc, FRODO_PIO_IPR, 0x10);

	/* ...and configure for edge triggering. */
	FRODO_WRITE(sc, FRODO_PIO_IELR, 0xcf);

	/*
	 * We defer hooking up our interrupt handler until
	 * a subdevice hooks up theirs.
	 */
	sc->sc_ih = NULL;

	/* ... and attach subdevices. */
	for (i = 0; frodo_subdevs[i].fa_name != NULL; i++)
		config_found_sm(self, &frodo_subdevs[i],
		    frodoprint, frodosubmatch);
}

int
frodosubmatch(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct cfdata *cf = match;
	struct frodo_attach_args *fa = aux;

	if (cf->frodocf_offset != FRODO_UNKNOWN_OFFSET &&
	    cf->frodocf_offset != fa->fa_offset)
		return (0);

	return ((*cf->cf_attach->ca_match)(parent, cf, aux));
}

int
frodoprint(aux, pnp)
	void *aux;
	const char *pnp;
{
	struct frodo_attach_args *fa = aux;

	if (pnp)
		printf("%s at %s", fa->fa_name, pnp);
	printf(" offset 0x%x", fa->fa_offset);
	return (UNCONF);
}

void
frodo_intr_establish(frdev, func, arg, line, priority)
	struct device *frdev;
	int (*func) __P((void *));
	void *arg;
	int line;
	int priority;
{
	struct frodo_softc *sc = (struct frodo_softc *)frdev;
	struct isr *isr = sc->sc_ih;

	if (line < 0 || line >= FRODO_NINTR) {
		printf("%s: bad interrupt line %d\n",
		    sc->sc_dev.dv_xname, line);
		goto lose;
	}
	if (sc->sc_intr[line].isr_func != NULL) {
		printf("%s: interrupt line %d already used\n",
		    sc->sc_dev.dv_xname, line);
		goto lose;
	}

	/* Install the handler. */
	sc->sc_intr[line].isr_func = func;
	sc->sc_intr[line].isr_arg = arg;
	sc->sc_intr[line].isr_priority = priority;

	/*
	 * If this is the first one, establish the frodo
	 * interrupt handler.  If not, reestablish at a
	 * higher priority if necessary.
	 */
	if (isr == NULL || isr->isr_priority < priority) {
		if (isr != NULL)
			intr_disestablish(isr);
		sc->sc_ih = intr_establish(frodointr, sc, 5, priority);
	}

	sc->sc_refcnt++;

	/* Enable the interrupt line. */
	frodo_imask(sc, (1 << line), 0);
	return;
 lose:
	panic("frodo_intr_establish");
}

void
frodo_intr_disestablish(frdev, line)
	struct device *frdev;
	int line;
{
	struct frodo_softc *sc = (struct frodo_softc *)frdev;
	struct isr *isr = sc->sc_ih;
	int newpri;

	if (sc->sc_intr[line].isr_func == NULL) {
		printf("%s: no handler for line %d\n",
		    sc->sc_dev.dv_xname, line);
		panic("frodo_intr_disestablish");
	}

	sc->sc_intr[line].isr_func = NULL;
	frodo_imask(sc, 0, (1 << line));

	/* If this was the last, unhook ourselves. */
	if (sc->sc_refcnt-- == 1) {
		intr_disestablish(isr);
		return;
	}

	/* Lower our priority, if appropriate. */
	for (newpri = 0, line = 0; line < FRODO_NINTR; line++)
		if (sc->sc_intr[line].isr_func != NULL &&
		    sc->sc_intr[line].isr_priority > newpri)
			newpri = sc->sc_intr[line].isr_priority;

	if (newpri != isr->isr_priority) {
		intr_disestablish(isr);
		sc->sc_ih = intr_establish(frodointr, sc, 5, newpri);
	}
}

int
frodointr(arg)
	void *arg;
{
	struct frodo_softc *sc = arg;
	struct frodo_isr *fisr;
	int line, taken = 0;

	/* Any interrupts pending? */
	if (FRODO_GETPEND(sc) == 0)
		return (0);

	do {
		/*
		 * Get pending interrupt; this also clears it for us.
		 */
		line = FRODO_IPEND(sc);
		fisr = &sc->sc_intr[line];
		if (fisr->isr_func == NULL ||
		    (*fisr->isr_func)(fisr->isr_arg) == 0)
			printf("%s: spurious interrupt on line %d\n",
			    sc->sc_dev.dv_xname, line);
		if (taken++ > 100)
			panic("frodointr: looping!");
	} while (FRODO_GETPEND(sc) != 0);

	return (1);
}

void
frodo_imask(sc, set, clear)
	struct frodo_softc *sc;
	u_int16_t set, clear;
{
	u_int16_t imask;

	imask = FRODO_GETMASK(sc);

	imask |= set;
	imask &= ~clear;

	FRODO_SETMASK(sc, imask);
}