/*	$NetBSD: pchb.c,v 1.6 1997/06/06 23:29:16 thorpej Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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 the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

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

#include <machine/bus.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>

#include <dev/pci/pcidevs.h>

#define PCISET_BRIDGETYPE_MASK	0x3
#define PCISET_TYPE_COMPAT	0x1
#define PCISET_TYPE_AUX		0x2

#define PCISET_BUSCONFIG_REG	0x48
#define PCISET_BRIDGE_NUMBER(reg)	(((reg) >> 8) & 0xff)
#define PCISET_PCI_BUS_NUMBER(reg)	(((reg) >> 16) & 0xff)

/* XXX should be in dev/ic/i82424{reg.var}.h */
#define I82424_CPU_BCTL_REG		0x53
#define I82424_PCI_BCTL_REG		0x54

#define I82424_BCTL_CPUMEM_POSTEN	0x01
#define I82424_BCTL_CPUPCI_POSTEN	0x02
#define I82424_BCTL_PCIMEM_BURSTEN	0x01
#define I82424_BCTL_PCI_BURSTEN		0x02

int	pchbmatch __P((struct device *, void *, void *));
void	pchbattach __P((struct device *, struct device *, void *));

int	pchb_print __P((void *, const char *));

struct cfattach pchb_ca = {
	sizeof(struct device), pchbmatch, pchbattach
};

struct cfdriver pchb_cd = {
	NULL, "pchb", DV_DULL
};


int
pchbmatch(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct pci_attach_args *pa = aux;

	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_HOST)
		return (1);

	return (0);
}

void
pchbattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct pci_attach_args *pa = aux;
	struct pcibus_attach_args pba;
	pcireg_t bcreg;
	u_char bdnum, pbnum;

	/*
	 * Print out a description, and configure certain chipsets which
	 * have auxiliary PCI buses.
	 */

	switch (PCI_VENDOR(pa->pa_id)) {
	case PCI_VENDOR_INTEL:
		switch (PCI_PRODUCT(pa->pa_id)) {
		case PCI_PRODUCT_INTEL_PCI450_PB:
			bcreg = pci_conf_read(pa->pa_pc, pa->pa_tag,
			    PCISET_BUSCONFIG_REG);
			bdnum = PCISET_BRIDGE_NUMBER(bcreg);
			pbnum = PCISET_PCI_BUS_NUMBER(bcreg);
			switch (bdnum & PCISET_BRIDGETYPE_MASK) {
			default:
				printf(": bdnum=%x (reserved)", bdnum);
				break;
			case PCISET_TYPE_COMPAT:
				printf(": Compatibility PB (bus %d)", pbnum);
				break;
			case PCISET_TYPE_AUX:
				printf(": Auxiliary PB (bus %d)", pbnum);
				/*
				 * This host bridge has a second PCI bus.
				 * Configure it.
				 */
				pba.pba_busname = "pci";
				pba.pba_iot = pa->pa_iot;
				pba.pba_memt = pa->pa_memt;
				pba.pba_dmat = pa->pa_dmat;
				pba.pba_bus = pbnum;
				pba.pba_pc = pa->pa_pc;
				config_found(self, &pba, pchb_print);
				break;
			}
			break;
		case PCI_PRODUCT_INTEL_CDC:
			bcreg = pci_conf_read(pa->pa_pc, pa->pa_tag,
			    I82424_CPU_BCTL_REG);
			if (bcreg & I82424_BCTL_CPUPCI_POSTEN) {
				bcreg &= ~I82424_BCTL_CPUPCI_POSTEN;
				pci_conf_write(pa->pa_pc, pa->pa_tag,
				    I82424_CPU_BCTL_REG, bcreg);
				printf(": disabled CPU-PCI write posting");
			}
			break;
		default:
			break;
		}
	}
	printf("\n");
}

int
pchb_print(aux, pnp)
	void *aux;
	const char *pnp;
{
	struct pcibus_attach_args *pba = aux;

	if (pnp)
		printf("%s at %s", pba->pba_busname, pnp);
	printf(" bus %d", pba->pba_bus);
	return (UNCONF);
}