/*	$OpenBSD: cardslot.c,v 1.13 2010/01/13 09:10:33 jsg Exp $	*/
/*	$NetBSD: cardslot.c,v 1.9 2000/03/22 09:35:06 haya Exp $	*/

/*
 * Copyright (c) 1999 and 2000
 *       HAYAKAWA Koichi.  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 ``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 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/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/kthread.h>
#include <sys/pool.h>
#include <sys/workq.h>

#include <machine/bus.h>

#include <dev/cardbus/cardslotvar.h>
#include <dev/cardbus/cardbusvar.h>
#include <dev/pcmcia/pcmciavar.h>
#include <dev/pcmcia/pcmciachip.h>
#include <dev/ic/i82365var.h>

#if defined CARDSLOT_DEBUG
#define STATIC
#define DPRINTF(a) printf a
#else
#ifdef DDB
#define STATIC
#else
#define STATIC static
#endif
#define DPRINTF(a)
#endif

STATIC void cardslotattach(struct device *, struct device *, void *);

STATIC int cardslotmatch(struct device *, void *, void *);
STATIC void cardslot_event(void *arg1, void *arg2);

STATIC int cardslot_cb_print(void *aux, const char *pcic);
STATIC int cardslot_16_print(void *, const char *);
STATIC int cardslot_16_submatch(struct device *, void *,void *);

struct cfattach cardslot_ca = {
	sizeof(struct cardslot_softc), cardslotmatch, cardslotattach
};

struct cfdriver cardslot_cd = {
	NULL, "cardslot", DV_DULL
};

struct pool cardsloteventpool;

STATIC int
cardslotmatch(struct device *parent, void *match, void *aux)
{
	struct cardslot_attach_args *caa = aux;

	if (caa->caa_cb_attach == NULL && caa->caa_16_attach == NULL) {
		/* Neither CardBus nor 16-bit PCMCIA are defined. */
		return (0);
	}

	return (1);
}

STATIC void
cardslotattach(struct device *parent, struct device *self, void *aux)
{
	struct cardslot_softc *sc = (struct cardslot_softc *)self;
	struct cardslot_attach_args *caa = aux;

	struct cbslot_attach_args *cba = caa->caa_cb_attach;
	struct pcmciabus_attach_args *pa = caa->caa_16_attach;

	struct cardbus_softc *csc = NULL;
	struct pcmcia_softc *psc = NULL;

	if (cardsloteventpool.pr_align == 0)
		pool_init(&cardsloteventpool, sizeof(struct cardslot_event),
		    0, 0, 0, "cardslot", NULL);

	sc->sc_slot = sc->sc_dev.dv_unit;
	sc->sc_cb_softc = NULL;
	sc->sc_16_softc = NULL;
	SIMPLEQ_INIT(&sc->sc_events);

	printf(" slot %d flags %x\n", sc->sc_slot,
	    sc->sc_dev.dv_cfdata->cf_flags);

	DPRINTF(("%s attaching CardBus bus...\n", sc->sc_dev.dv_xname));
	if (cba != NULL) {
		if ((csc = (void *)config_found(self, cba,
		    cardslot_cb_print)) != NULL) {
			/* cardbus found */
			DPRINTF(("cardslotattach: found cardbus on %s\n",
			    sc->sc_dev.dv_xname));
			sc->sc_cb_softc = csc;
		}
	}

	if (pa != NULL) {
		if ((psc = (void *)config_found_sm(self, pa, cardslot_16_print,
		    cardslot_16_submatch)) != NULL) {
			/* pcmcia 16-bit bus found */
			DPRINTF(("cardslotattach: found 16-bit pcmcia bus\n"));
			sc->sc_16_softc = psc;
			/* XXX: dirty.  This code should be removed
			 * to achieve MI
			 */
			caa->caa_ph->pcmcia = (struct device *)psc;
		}
	}

	if (csc && (csc->sc_cf->cardbus_ctrl)(csc->sc_cc, CARDBUS_CD)) {
		DPRINTF(("cardslotattach: CardBus card found\n"));
		/* attach deferred */
		cardslot_event_throw(sc, CARDSLOT_EVENT_INSERTION_CB);
	}

	if (psc && (psc->pct->card_detect)(psc->pch)) {
		DPRINTF(("cardbusattach: 16-bit card found\n"));
		/* attach deferred */
		cardslot_event_throw(sc, CARDSLOT_EVENT_INSERTION_16);
	}
}

STATIC int
cardslot_cb_print(void *aux, const char *pnp)
{
	struct cbslot_attach_args *cba = aux;

	if (pnp)
		printf("cardbus at %s subordinate bus %d", pnp, cba->cba_bus);

	return (UNCONF);
}

STATIC int
cardslot_16_submatch(struct device *parent, void *match, void *aux)
{
	struct cfdata *cf = match;

	if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != 0)
		return (0);

	if (cf->cf_loc[0] == -1)
		return ((*cf->cf_attach->ca_match)(parent, cf, aux));

	return (0);
}

STATIC int
cardslot_16_print(void *arg, const char *pnp)
{
	if (pnp)
		printf("pcmciabus at %s", pnp);

	return (UNCONF);
}

/*
 * void cardslot_event_throw(struct cardslot_softc *sc, int ev)
 *
 *   This function throws an event to the event handler.  If the state
 *   of a slot is changed, it should be noticed using this function.
 */
void
cardslot_event_throw(struct cardslot_softc *sc, int ev)
{
	struct cardslot_event *ce;
	int s;

	DPRINTF(("cardslot_event_throw: an event %s comes\n",
	    ev == CARDSLOT_EVENT_INSERTION_CB ? "CardBus Card inserted" :
	    ev == CARDSLOT_EVENT_INSERTION_16 ? "16-bit Card inserted" :
	    ev == CARDSLOT_EVENT_REMOVAL_CB ? "CardBus Card removed" :
	    ev == CARDSLOT_EVENT_REMOVAL_16 ? "16-bit Card removed" : "???"));

	ce = pool_get(&cardsloteventpool, PR_NOWAIT);
	if (ce == NULL)
		return;
	ce->ce_type = ev;

	s = spltty();
	SIMPLEQ_INSERT_TAIL(&sc->sc_events, ce, ce_q);
	splx(s);

	workq_add_task(NULL, 0, cardslot_event, sc, NULL);
}

/*
 * STATIC void cardslot_event(void *arg)
 *
 *   This function is the main routine handing cardslot events such as
 *   insertions and removals.
 *
 */
STATIC void
cardslot_event(void *arg1, void *arg2)
{
	struct cardslot_softc *sc = arg1;
	struct cardslot_event *ce;
	int s, ev;

	s = spltty();
	if ((ce = SIMPLEQ_FIRST(&sc->sc_events)) == NULL) {
		splx(s);
		return;
	}
	SIMPLEQ_REMOVE_HEAD(&sc->sc_events, ce_q);

	if (IS_CARDSLOT_INSERT_REMOVE_EV(ce->ce_type)) {
		/* Chattering suppression */
		static int antonym_ev[4] = {
			CARDSLOT_EVENT_REMOVAL_16,
			CARDSLOT_EVENT_INSERTION_16,
			CARDSLOT_EVENT_REMOVAL_CB,
			CARDSLOT_EVENT_INSERTION_CB
		};

		while (1) {
			struct cardslot_event *ce1, *ce2;

			if ((ce1 = SIMPLEQ_FIRST(&sc->sc_events)) ==
			    NULL)
				break;
			if (ce1->ce_type != antonym_ev[ce->ce_type])
				break;
			if ((ce2 = SIMPLEQ_NEXT(ce1, ce_q)) == NULL)
				break;
			if (ce2->ce_type == ce->ce_type) {
				SIMPLEQ_REMOVE_HEAD(&sc->sc_events, ce_q);
				pool_put(&cardsloteventpool, ce1);
				SIMPLEQ_REMOVE_HEAD(&sc->sc_events, ce_q);
				pool_put(&cardsloteventpool, ce2);
			}
		}
	}
	splx(s);

	ev = ce->ce_type;
	pool_put(&cardsloteventpool, ce);

	switch (ev) {
	case CARDSLOT_EVENT_INSERTION_CB:
		if ((CARDSLOT_CARDTYPE(sc->sc_status) ==
		     CARDSLOT_STATUS_CARD_CB) ||
		    (CARDSLOT_CARDTYPE(sc->sc_status) ==
		     CARDSLOT_STATUS_CARD_16)) {
			if (CARDSLOT_WORK(sc->sc_status) ==
			    CARDSLOT_STATUS_WORKING) {
				/* A card has already been inserted
				 * and works.
				 */
				break;
			}
		}

		if (sc->sc_cb_softc) {
			CARDSLOT_SET_CARDTYPE(sc->sc_status,
			    CARDSLOT_STATUS_CARD_CB);
			if (cardbus_attach_card(sc->sc_cb_softc) > 0) {
				/* At least one function works */
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_WORKING);
			} else {
				/* No functions work or this card is
				 * not known
				 */
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_NOTWORK);
			}
		} else {
			printf("%s: CardBus support disabled\n",
			    sc->sc_dev.dv_xname);
		}
		break;

	case CARDSLOT_EVENT_INSERTION_16:
		if ((CARDSLOT_CARDTYPE(sc->sc_status) ==
		     CARDSLOT_STATUS_CARD_CB) ||
		    (CARDSLOT_CARDTYPE(sc->sc_status) ==
		     CARDSLOT_STATUS_CARD_16)) {
			if (CARDSLOT_WORK(sc->sc_status) ==
			    CARDSLOT_STATUS_WORKING) {
				/* A card has already been inserted
				 * and works.
				 */
				break;
			}
		}
		if (sc->sc_16_softc) {
			CARDSLOT_SET_CARDTYPE(sc->sc_status,
			    CARDSLOT_STATUS_CARD_16);
			if (pcmcia_card_attach(
			    (struct device *)sc->sc_16_softc)) {
				/* Do not attach */
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_NOTWORK);
			} else {
				/* working */
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_WORKING);
			}
		} else {
			panic("no 16-bit pcmcia on %s",
			    sc->sc_dev.dv_xname);
		}
		break;

	case CARDSLOT_EVENT_REMOVAL_CB:
		if (CARDSLOT_CARDTYPE(sc->sc_status) ==
		    CARDSLOT_STATUS_CARD_CB) {
			/* CardBus card has not been inserted. */
			if (CARDSLOT_WORK(sc->sc_status) ==
			    CARDSLOT_STATUS_WORKING) {
				cardbus_detach_card(sc->sc_cb_softc);
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_NOTWORK);
				CARDSLOT_SET_WORK(sc->sc_status,
				    CARDSLOT_STATUS_CARD_NONE);
			}
			CARDSLOT_SET_CARDTYPE(sc->sc_status,
			    CARDSLOT_STATUS_CARD_NONE);
		} else if (CARDSLOT_CARDTYPE(sc->sc_status) !=
		    CARDSLOT_STATUS_CARD_16) {
			/* Unknown card... */
			CARDSLOT_SET_CARDTYPE(sc->sc_status,
			    CARDSLOT_STATUS_CARD_NONE);
		}
		CARDSLOT_SET_WORK(sc->sc_status,
		    CARDSLOT_STATUS_NOTWORK);
		break;

	case CARDSLOT_EVENT_REMOVAL_16:
		DPRINTF(("%s: removal event\n", sc->sc_dev.dv_xname));
		if (CARDSLOT_CARDTYPE(sc->sc_status) !=
		    CARDSLOT_STATUS_CARD_16) {
			/* 16-bit card has not been inserted. */
			break;
		}
		if ((sc->sc_16_softc != NULL) &&
		    (CARDSLOT_WORK(sc->sc_status) ==
		     CARDSLOT_STATUS_WORKING)) {
			struct pcmcia_softc *psc = sc->sc_16_softc;

			pcmcia_card_deactivate((struct device *)psc);
			pcmcia_chip_socket_disable(psc->pct, psc->pch);
			pcmcia_card_detach((struct device *)psc,
			    DETACH_FORCE);
		}
		CARDSLOT_SET_CARDTYPE(sc->sc_status,
		    CARDSLOT_STATUS_CARD_NONE);
		CARDSLOT_SET_WORK(sc->sc_status,
		    CARDSLOT_STATUS_NOTWORK);
		break;

	default:
		panic("cardslot_event_thread: unknown event %d", ev);
	}
}