/*	$OpenBSD: isapnp.c,v 1.43 2022/04/06 18:59:28 naddy Exp $	*/
/*	$NetBSD: isapnp.c,v 1.9.4.3 1997/10/29 00:40:43 thorpej Exp $	*/

/*
 * Copyright (c) 1996 Christos Zoulas.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Christos Zoulas.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

/*
 * ISA PnP bus autoconfiguration.
 */

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

#include <machine/bus.h>

#include <dev/isa/isapnpreg.h>

#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>

#include <dev/isa/pnpdevs.h>

#include "isadma.h"

void isapnp_init(struct isapnp_softc *);
static __inline u_char isapnp_shift_bit(struct isapnp_softc *);
int isapnp_findcard(struct isapnp_softc *);
void isapnp_free_region(bus_space_tag_t, struct isapnp_region *);
int isapnp_alloc_region(bus_space_tag_t, struct isapnp_region *);
int isapnp_alloc_irq(isa_chipset_tag_t, struct isapnp_pin *);
int isapnp_alloc_drq(struct device *, struct isapnp_pin *);
int isapnp_testconfig(bus_space_tag_t, bus_space_tag_t,
    struct isa_attach_args *, int);
struct isa_attach_args *isapnp_bestconfig(struct device *,
    struct isapnp_softc *, struct isa_attach_args **);
void isapnp_print_region(const char *, struct isapnp_region *,
    size_t);
void isapnp_configure(struct isapnp_softc *,
    const struct isa_attach_args *);
void isapnp_print_pin(const char *, struct isapnp_pin *, size_t);
int isapnp_print(void *, const char *);
int isapnp_submatch(struct device *, void *, void *);
int isapnp_com_submatch(struct device *, void *, void *);
int isapnp_find(struct isapnp_softc *, int);
int isapnp_match(struct device *, void *, void *);
void isapnp_attach(struct device *, struct device *, void *);

#ifdef DEBUG_ISAPNP
# define DPRINTF(a) printf a
#else
# define DPRINTF(a)
#endif

const struct cfattach isapnp_ca = {
	sizeof(struct isapnp_softc), isapnp_match, isapnp_attach
};

struct cfdriver isapnp_cd = {
	NULL, "isapnp", DV_DULL
};


/* isapnp_init():
 *	Write the PNP initiation key to wake up the cards...
 */
void
isapnp_init(struct isapnp_softc *sc)
{
	int i;
	u_char v = ISAPNP_LFSR_INIT;

	/* First write 0's twice to enter the Wait for Key state */
	ISAPNP_WRITE_ADDR(sc, 0);
	ISAPNP_WRITE_ADDR(sc, 0);

	/* Send the 32 byte sequence to awake the logic */
	for (i = 0; i < ISAPNP_LFSR_LENGTH; i++) {
		ISAPNP_WRITE_ADDR(sc, v);
		v = ISAPNP_LFSR_NEXT(v);
	}
}


/* isapnp_shift_bit():
 *	Read a bit at a time from the config card.
 */
static __inline u_char
isapnp_shift_bit(struct isapnp_softc *sc)
{
	u_char c1, c2;

	DELAY(250);
	c1 = ISAPNP_READ_DATA(sc);
	DELAY(250);
	c2 = ISAPNP_READ_DATA(sc);

	if (c1 == 0x55 && c2 == 0xAA)
		return 0x80;
	else
		return 0;
}


/* isapnp_findcard():
 *	Attempt to read the vendor/serial/checksum for a card
 *	If a card is found [the checksum matches], assign the
 *	next card number to it and return 1
 */
int
isapnp_findcard(struct isapnp_softc *sc)
{
	u_char v = ISAPNP_LFSR_INIT, csum, w;
	int i, b;

	if (sc->sc_ncards == ISAPNP_MAX_CARDS) {
		printf("%s: Too many pnp cards\n", sc->sc_dev.dv_xname);
		return 0;
	}

	/* Set the read port */
	isapnp_write_reg(sc, ISAPNP_WAKE, 0);
	isapnp_write_reg(sc, ISAPNP_SET_RD_PORT, sc->sc_read_port >> 2);
	sc->sc_read_port |= 3;
	DELAY(1000);

	ISAPNP_WRITE_ADDR(sc, ISAPNP_SERIAL_ISOLATION);
	DELAY(1000);

	/* Read the 8 bytes of the Vendor ID and Serial Number */
	for(i = 0; i < 8; i++) {
		/* Read each bit separately */
		for (w = 0, b = 0; b < 8; b++) {
			u_char neg = isapnp_shift_bit(sc);

			w >>= 1;
			w |= neg;
			v = ISAPNP_LFSR_NEXT(v) ^ neg;
		}
		sc->sc_id[sc->sc_ncards][i] = w;
	}

	/* Read the remaining checksum byte */
	for (csum = 0, b = 0; b < 8; b++) {
		u_char neg = isapnp_shift_bit(sc);

		csum >>= 1;
		csum |= neg;
	}
	sc->sc_id[sc->sc_ncards][8] = csum;

	if (csum == v) {
		sc->sc_ncards++;
		isapnp_write_reg(sc, ISAPNP_CARD_SELECT_NUM, sc->sc_ncards);
		return 1;
	}
	return 0;
}


/* isapnp_free_region():
 *	Free a region
 */
void
isapnp_free_region(bus_space_tag_t t, struct isapnp_region *r)
{
	if (r->length == 0)
		return;

	bus_space_unmap(t, r->h, r->length);
	r->h = 0;
}


/* isapnp_alloc_region():
 *	Allocate a single region if possible
 */
int
isapnp_alloc_region(bus_space_tag_t t, struct isapnp_region *r)
{
	int error = 0;

	if (r->length == 0)
		return 0;

	r->h = 0;
	for (r->base = r->minbase; r->base <= r->maxbase;
	     r->base += r->align) {
		error = bus_space_map(t, r->base, r->length, 0, &r->h);
		if (error == 0)
			return 0;
	}
	return error;
}


/* isapnp_alloc_irq():
 *	Allocate an irq
 */
int
isapnp_alloc_irq(isa_chipset_tag_t ic, struct isapnp_pin *i)
{
	int irq;
#define LEVEL_IRQ (ISAPNP_IRQTYPE_LEVEL_PLUS|ISAPNP_IRQTYPE_LEVEL_MINUS)
	i->type = (i->flags & LEVEL_IRQ) ? IST_LEVEL : IST_EDGE;

	if (i->bits == 0) {
		i->num = 0;
		return 0;
	}

	if (isa_intr_alloc(ic, i->bits, i->type, &irq) == 0) {
		i->num = irq;
		return 0;
	}

	return EINVAL;
}

/* isapnp_alloc_drq():
 *	Allocate a drq
 */
int
isapnp_alloc_drq(struct device *isa, struct isapnp_pin *i)
{
#if NISADMA > 0
	int b;

	if (i->bits == 0) {
		i->num = 0;
		return 0;
	}

	for (b = 0; b < 16; b++)
		if ((i->bits & (1 << b)) && isa_drq_isfree(isa, b)) {
			i->num = b;
			return 0;
		}
#endif

	return EINVAL;
}

/* isapnp_testconfig():
 *	Test/Allocate the regions used
 */
int
isapnp_testconfig(bus_space_tag_t iot, bus_space_tag_t memt,
    struct isa_attach_args *ipa, int alloc)
{
	int nio = 0, nmem = 0, nmem32 = 0, nirq = 0, ndrq = 0;
	int error = 0;

#ifdef DEBUG_ISAPNP
	isapnp_print_attach(ipa);
#endif

	for (; nio < ipa->ipa_nio; nio++) {
		error = isapnp_alloc_region(iot, &ipa->ipa_io[nio]);
		if (error)
			goto bad;
	}

	for (; nmem < ipa->ipa_nmem; nmem++) {
		error = isapnp_alloc_region(memt, &ipa->ipa_mem[nmem]);
		if (error)
			goto bad;
	}

	for (; nmem32 < ipa->ipa_nmem32; nmem32++) {
		error = isapnp_alloc_region(memt, &ipa->ipa_mem32[nmem32]);
		if (error)
			goto bad;
	}

	for (; nirq < ipa->ipa_nirq; nirq++) {
		error = isapnp_alloc_irq(ipa->ia_ic, &ipa->ipa_irq[nirq]);
		if (error)
			goto bad;
	}

	for (; ndrq < ipa->ipa_ndrq; ndrq++) {
		error = isapnp_alloc_drq(ipa->ia_isa, &ipa->ipa_drq[ndrq]);
		if (error)
			goto bad;
	}

	if (alloc)
		return error;

bad:
	for (nmem32--; nmem32 >= 0; nmem32--)
		isapnp_free_region(memt, &ipa->ipa_mem32[nmem32]);

	for (nmem--; nmem >= 0; nmem--)
		isapnp_free_region(memt, &ipa->ipa_mem[nmem]);

	for (nio--; nio >= 0; nio--)
		isapnp_free_region(iot, &ipa->ipa_io[nio]);

	return error;
}


/* isapnp_config():
 *	Test/Allocate the regions used
 */
int
isapnp_config(bus_space_tag_t iot, bus_space_tag_t memt,
    struct isa_attach_args *ipa)
{
	return isapnp_testconfig(iot, memt, ipa, 1);
}


/* isapnp_unconfig():
 *	Free the regions used
 */
void
isapnp_unconfig(bus_space_tag_t iot, bus_space_tag_t memt,
    struct isa_attach_args *ipa)
{
	int i;

	for (i = 0; i < ipa->ipa_nmem32; i++)
		isapnp_free_region(memt, &ipa->ipa_mem32[i]);

	for (i = 0; i < ipa->ipa_nmem; i++)
		isapnp_free_region(memt, &ipa->ipa_mem[i]);

	for (i = 0; i < ipa->ipa_nio; i++)
		isapnp_free_region(iot, &ipa->ipa_io[i]);
}


/* isapnp_bestconfig():
 *	Return the best configuration for each logical device, remove and
 *	free all other configurations.
 */
struct isa_attach_args *
isapnp_bestconfig(struct device *isa, struct isapnp_softc *sc,
    struct isa_attach_args **ipa)
{
	struct isa_attach_args *c, *best, *f = *ipa;
	int error;

	for (;;) {
		if (f == NULL)
			return NULL;

#define SAMEDEV(a, b) (strcmp((a)->ipa_devlogic, (b)->ipa_devlogic) == 0)

		/* Find the best config */
		for (best = c = f; c != NULL; c = c->ipa_sibling) {
			if (!SAMEDEV(c, f))
				continue;
			if (c->ipa_pref < best->ipa_pref)
				best = c;
		}

		best->ia_isa = isa;
		/* Test the best config */
		error = isapnp_testconfig(sc->sc_iot, sc->sc_memt, best, 0);

		/* Remove this config from the list */
		if (best == f)
			f = f->ipa_sibling;
		else {
			for (c = f; c->ipa_sibling != best; c = c->ipa_sibling)
				continue;
			c->ipa_sibling = best->ipa_sibling;
		}

		if (error) {
			best->ipa_pref = ISAPNP_DEP_CONFLICTING;

			for (c = f; c != NULL; c = c->ipa_sibling)
				if (c != best && SAMEDEV(c, best))
					break;
			/* Last config for this logical device is conflicting */
			if (c == NULL) {
				*ipa = f;
				return best;
			}

			free(best, M_DEVBUF, 0);
			continue;
		}
		else {
			/* Remove all other configs for this device */
			struct isa_attach_args *l = NULL, *n = NULL, *d;

			for (c = f; c; ) {
				if (c == best)
					continue;
				d = c->ipa_sibling;
				if (SAMEDEV(c, best))
					free(c, M_DEVBUF, 0);
				else {
					if (n)
						n->ipa_sibling = c;

					else
						l = c;
					n = c;
					c->ipa_sibling = NULL;
				}
				c = d;
			}
			f = l;
		}
		*ipa = f;
		return best;
	}
}


/* isapnp_id_to_vendor():
 *	Convert a pnp ``compressed ascii'' vendor id to a string
 */
char *
isapnp_id_to_vendor(char *v, const u_char *id)
{
	static const char hex[] = "0123456789ABCDEF";
	char *p = v;

	*p++ = 'A' + (id[0] >> 2) - 1;
	*p++ = 'A' + ((id[0] & 3) << 3) + (id[1] >> 5) - 1;
	*p++ = 'A' + (id[1] & 0x1f) - 1;
	*p++ = hex[id[2] >> 4];
	*p++ = hex[id[2] & 0x0f];
	*p++ = hex[id[3] >> 4];
	*p++ = hex[id[3] & 0x0f];
	*p = '\0';

	return v;
}


/* isapnp_print_region():
 *	Print a region allocation
 */
void
isapnp_print_region(const char *str, struct isapnp_region *r, size_t n)
{
	size_t i;

	if (n == 0)
		return;

	printf(" %s ", str);
	for (i = 0; i < n; i++, r++) {
		printf("0x%x", r->base);
		if (r->length)
			printf("/%d", r->length);
		if (i != n - 1)
			printf(",");
	}
}


/* isapnp_print_pin():
 *	Print an irq/drq assignment
 */
void
isapnp_print_pin(const char *str, struct isapnp_pin *p, size_t n)
{
	size_t i;

	if (n == 0)
		return;

	printf(" %s ", str);
	for (i = 0; i < n; i++, p++) {
		printf("%d", p->num);
		if (i != n - 1)
			printf(",");
	}
}

/* isapnp_print():
 *	Print the configuration line for an ISA PnP card.
 */
int
isapnp_print(void *aux, const char *str)
{
	struct isa_attach_args *ipa = aux;

	if (!str)
		printf(" ");
	printf("\"%s, %s, %s, %s\"", ipa->ipa_devident,
	    ipa->ipa_devlogic, ipa->ipa_devcompat, ipa->ipa_devclass);

	if (str)
		printf(" at %s", str);

	isapnp_print_region("port", ipa->ipa_io, ipa->ipa_nio);
	isapnp_print_region("mem", ipa->ipa_mem, ipa->ipa_nmem);
	isapnp_print_region("mem32", ipa->ipa_mem32, ipa->ipa_nmem32);
	isapnp_print_pin("irq", ipa->ipa_irq, ipa->ipa_nirq);
	isapnp_print_pin("drq", ipa->ipa_drq, ipa->ipa_ndrq);
	return UNCONF;
}


/* isapnp_submatch():
 * Special case.
 * A lot of com devices do not have the PNPxxx identifiers
 * they should have.  If it looks like a modem..... let's try it.
 */
int
isapnp_com_submatch(struct device *parent, void *match, void *aux)
{
	struct cfdata *cf = match;
	struct isa_attach_args *ipa = aux;

	if (strcmp("com", cf->cf_driver->cd_name) == 0 &&
	    ipa->ipa_nio == 1 && ipa->ipa_nirq == 1 &&
	    ipa->ipa_ndrq == 0 && ipa->ipa_nmem == 0 &&
	    ipa->ipa_io[0].length == 8) {
		if (isapnp_config(ipa->ia_iot, ipa->ia_memt, ipa)) {
			printf("%s: error in region allocation\n",
			    cf->cf_driver->cd_name);
			return (0);
		}
		return ((*cf->cf_attach->ca_match)(parent, match, ipa));
	}
	return (0);
}

/* isapnp_submatch():
 *	Probe the logical device...
 */
int
isapnp_submatch(struct device *parent, void *match, void *aux)
{
	struct cfdata *cf = match;
	struct isa_attach_args *ipa = aux;
	const char *dname;
	int i;

	for (i = 0; i < nitems(isapnp_knowndevs); i++) {
		dname = NULL;

		if (strcmp(isapnp_knowndevs[i].pnpid, ipa->ipa_devlogic) == 0)
			dname = isapnp_knowndevs[i].driver;
		else if (strcmp(isapnp_knowndevs[i].pnpid, ipa->ipa_devcompat) == 0)
			dname = isapnp_knowndevs[i].driver;

		if (dname && strcmp(dname, cf->cf_driver->cd_name) == 0) {
			/*
			 * We found a match.  Configure the card and call the
			 * ISA probe...
			 */
			if (isapnp_config(ipa->ia_iot, ipa->ia_memt, ipa)) {
				printf("%s: error in region allocation\n",
				    cf->cf_driver->cd_name);
				return (0);
			}

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

	return (0);
}

/* isapnp_find():
 *	Probe and add cards
 */
int
isapnp_find(struct isapnp_softc *sc, int all)
{
	int p;

	isapnp_init(sc);

	isapnp_write_reg(sc, ISAPNP_CONFIG_CONTROL, ISAPNP_CC_RESET_DRV);
	DELAY(2000);

	isapnp_init(sc);
	DELAY(2000);

	for (p = ISAPNP_RDDATA_MIN; p <= ISAPNP_RDDATA_MAX; p += 4) {
		sc->sc_read_port = p;
		if (isapnp_map_readport(sc))
			continue;
		DPRINTF(("%s: Trying port %x\n", sc->sc_dev.dv_xname, p));
		if (isapnp_findcard(sc))
			break;
		isapnp_unmap_readport(sc);
	}

	if (p > ISAPNP_RDDATA_MAX) {
		sc->sc_read_port = 0;
		return 0;
	}

	if (all)
		while (isapnp_findcard(sc))
			continue;

	return 1;
}


/* isapnp_configure():
 *	Configure a PnP card
 *	XXX: The memory configuration code is wrong. We need to check the
 *	     range/length bit an do appropriate sets.
 */
void
isapnp_configure(struct isapnp_softc *sc, const struct isa_attach_args *ipa)
{
	int i;
	static u_char isapnp_mem_range[] = ISAPNP_MEM_DESC;
	static u_char isapnp_io_range[] = ISAPNP_IO_DESC;
	static u_char isapnp_irq_range[] = ISAPNP_IRQ_DESC;
	static u_char isapnp_drq_range[] = ISAPNP_DRQ_DESC;
	static u_char isapnp_mem32_range[] = ISAPNP_MEM32_DESC;
	const struct isapnp_region *r;
	const struct isapnp_pin *p;
	struct isapnp_region rz;
	struct isapnp_pin pz;

	bzero(&pz, sizeof(pz));
	bzero(&rz, sizeof(rz));

#define B0(a) ((a) & 0xff)
#define B1(a) (((a) >> 8) & 0xff)
#define B2(a) (((a) >> 16) & 0xff)
#define B3(a) (((a) >> 24) & 0xff)

	for (i = 0; i < sizeof(isapnp_io_range); i++) {
		if (i < ipa->ipa_nio)
			r = &ipa->ipa_io[i];
		else
			r = &rz;

		isapnp_write_reg(sc,
		    isapnp_io_range[i] + ISAPNP_IO_BASE_15_8, B1(r->base));
		isapnp_write_reg(sc,
		    isapnp_io_range[i] + ISAPNP_IO_BASE_7_0, B0(r->base));
	}

	for (i = 0; i < sizeof(isapnp_mem_range); i++) {
		if (i < ipa->ipa_nmem)
			r = &ipa->ipa_mem[i];
		else
			r = &rz;

		isapnp_write_reg(sc,
		    isapnp_mem_range[i] + ISAPNP_MEM_BASE_23_16, B2(r->base));
		isapnp_write_reg(sc,
		    isapnp_mem_range[i] + ISAPNP_MEM_BASE_15_8, B1(r->base));

		isapnp_write_reg(sc,
		    isapnp_mem_range[i] + ISAPNP_MEM_LRANGE_23_16,
		    B2(r->length));
		isapnp_write_reg(sc,
		    isapnp_mem_range[i] + ISAPNP_MEM_LRANGE_15_8,
		    B1(r->length));
	}

	for (i = 0; i < sizeof(isapnp_irq_range); i++) {
		u_char v;

		if (i < ipa->ipa_nirq)
			p = &ipa->ipa_irq[i];
		else
			p = &pz;

		isapnp_write_reg(sc,
		    isapnp_irq_range[i] + ISAPNP_IRQ_NUMBER, p->num);

		switch (p->flags) {
		case ISAPNP_IRQTYPE_LEVEL_PLUS:
			v = ISAPNP_IRQ_LEVEL|ISAPNP_IRQ_HIGH;
			break;

		case ISAPNP_IRQTYPE_EDGE_PLUS:
			v = ISAPNP_IRQ_HIGH;
			break;

		case ISAPNP_IRQTYPE_LEVEL_MINUS:
			v = ISAPNP_IRQ_LEVEL;
			break;

		default:
		case ISAPNP_IRQTYPE_EDGE_MINUS:
			v = 0;
			break;
		}
		isapnp_write_reg(sc,
		    isapnp_irq_range[i] + ISAPNP_IRQ_CONTROL, v);
	}

	for (i = 0; i < sizeof(isapnp_drq_range); i++) {
		u_char v;

		if (i < ipa->ipa_ndrq)
			v = ipa->ipa_drq[i].num;
		else
			v = 4;

		isapnp_write_reg(sc, isapnp_drq_range[i], v);
	}

	for (i = 0; i < sizeof(isapnp_mem32_range); i++) {
		if (i < ipa->ipa_nmem32)
			r = &ipa->ipa_mem32[i];
		else
			r = &rz;

		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_BASE_31_24,
		    B3(r->base));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_BASE_23_16,
		    B2(r->base));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_BASE_15_8,
		    B1(r->base));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_BASE_7_0,
		    B0(r->base));

		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_LRANGE_31_24,
		    B3(r->length));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_LRANGE_23_16,
		    B2(r->length));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_LRANGE_15_8,
		    B1(r->length));
		isapnp_write_reg(sc,
		    isapnp_mem32_range[i] + ISAPNP_MEM32_LRANGE_7_0,
		    B0(r->length));
	}
}


/*
 * Some BIOSes take the liberty of configuring our ISA cards for us.
 * This code undoes the PNP card configuration.
 */

void
isapnp_isa_attach_hook(struct isa_softc *isa_sc)
{
	struct isapnp_softc sc;

	bzero(&sc, sizeof sc);
	sc.sc_iot = isa_sc->sc_iot;
	sc.sc_ncards = 0;

	if (isapnp_map(&sc))
		return;

	isapnp_init(&sc);

	isapnp_write_reg(&sc, ISAPNP_CONFIG_CONTROL, ISAPNP_CC_RESET_DRV);
	DELAY(2000);

	isapnp_unmap(&sc);
}

/* isapnp_match():
 *	Probe routine
 */
int
isapnp_match(struct device *parent, void *match, void *aux)
{
	int rv;
	struct isapnp_softc sc;
	struct isa_attach_args *ia = aux;

	sc.sc_iot = ia->ia_iot;
	sc.sc_ncards = 0;
	(void) strlcpy(sc.sc_dev.dv_xname, "(isapnp probe)",
	     sizeof sc.sc_dev.dv_xname);

	if (isapnp_map(&sc))
		return 0;

	rv = isapnp_find(&sc, 0);
	ia->ia_iobase = ISAPNP_ADDR;
	ia->ia_iosize = 1;

	isapnp_unmap(&sc);
	if (rv)
		isapnp_unmap_readport(&sc);

	return (rv);
}


/* isapnp_attach
 *	Find and attach PnP cards.
 */
void
isapnp_attach(struct device *parent, struct device *self, void *aux)
{
	struct isapnp_softc *sc = (struct isapnp_softc *) self;
	struct isa_attach_args *ia = aux;
	void *match;
	int c, d;

	sc->sc_iot = ia->ia_iot;
	sc->sc_memt = ia->ia_memt;
#if NISADMA > 0
	sc->sc_dmat = ia->ia_dmat;
#endif
	sc->sc_ncards = 0;

	if (isapnp_map(sc))
		panic("%s: bus map failed", sc->sc_dev.dv_xname);

	if (!isapnp_find(sc, 1)) {
		printf(": no cards found\n");
		return;
	}

	printf(": read port 0x%x\n", sc->sc_read_port);

	for (c = 0; c < sc->sc_ncards; c++) {
		struct isa_attach_args *ipa, *lpa;

		/* Good morning card c */
		isapnp_write_reg(sc, ISAPNP_WAKE, c + 1);

		if ((ipa = isapnp_get_resource(sc, c, ia)) == NULL)
			continue;

		DPRINTF(("Selecting attachments\n"));
		for (d = 0;
		    (lpa = isapnp_bestconfig(parent, sc, &ipa)) != NULL; d++) {
			isapnp_write_reg(sc, ISAPNP_LOGICAL_DEV_NUM, d);
			isapnp_configure(sc, lpa);
#ifdef DEBUG_ISAPNP
			{
				struct isa_attach_args pa;

				isapnp_get_config(sc, &pa);
				isapnp_print_config(&pa);
			}
#endif

			DPRINTF(("%s: configuring <%s, %s, %s, %s>\n",
			    sc->sc_dev.dv_xname,
			    lpa->ipa_devident, lpa->ipa_devlogic,
			    lpa->ipa_devcompat, lpa->ipa_devclass));
			if (lpa->ipa_pref == ISAPNP_DEP_CONFLICTING) {
				isapnp_print(lpa, self->dv_xname);
				printf(" resource conflict\n");
				free(lpa, M_DEVBUF, 0);
				continue;
			}

			lpa->ia_ic = ia->ia_ic;
			lpa->ia_iot = ia->ia_iot;
			lpa->ia_memt = ia->ia_memt;
#if NISADMA > 0
			lpa->ia_dmat = ia->ia_dmat;
#endif
			lpa->ia_delaybah = ia->ia_delaybah;

			isapnp_write_reg(sc, ISAPNP_ACTIVATE, 1);

			if ((match = config_search(isapnp_submatch,
			    self, lpa)))
				config_attach(self, match, lpa, isapnp_print);
			else if ((match = config_search(isapnp_com_submatch,
			    self, lpa)))
				config_attach(self, match, lpa, isapnp_print);
			else {
				isapnp_print(lpa, self->dv_xname);
				printf(" not configured\n");
				isapnp_write_reg(sc, ISAPNP_ACTIVATE, 0);
			}
			free(lpa, M_DEVBUF, 0);
		}
		isapnp_write_reg(sc, ISAPNP_WAKE, 0);    /* Good night cards */
	}
}