/* $NetBSD: apecs.c,v 1.23 1997/09/02 12:40:18 thorpej Exp $ */

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <machine/options.h>		/* Config options headers */
#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: apecs.c,v 1.23 1997/09/02 12:40:18 thorpej Exp $");

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

#include <machine/autoconf.h>
#include <machine/rpb.h>

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

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/apecsreg.h>
#include <alpha/pci/apecsvar.h>
#ifdef DEC_2100_A50
#include <alpha/pci/pci_2100_a50.h>
#endif

int	apecsmatch __P((struct device *, struct cfdata *, void *));
void	apecsattach __P((struct device *, struct device *, void *));

struct cfattach apecs_ca = {
	sizeof(struct apecs_softc), apecsmatch, apecsattach,
};

struct cfdriver apecs_cd = {
	NULL, "apecs", DV_DULL,
};

static int	apecsprint __P((void *, const char *pnp));

/* There can be only one. */
int apecsfound;
struct apecs_config apecs_configuration;

int
apecsmatch(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct confargs *ca = aux;

	/* Make sure that we're looking for an APECS. */
	if (strcmp(ca->ca_name, apecs_cd.cd_name) != 0)
		return (0);

	if (apecsfound)
		return (0);

	return (1);
}

/*
 * Set up the chipset's function pointers.
 */
void
apecs_init(acp, mallocsafe)
	struct apecs_config *acp;
	int mallocsafe;
{
	acp->ac_comanche_pass2 =
	    (REGVAL(COMANCHE_ED) & COMANCHE_ED_PASS2) != 0;
	acp->ac_memwidth =
	    (REGVAL(COMANCHE_GCR) & COMANCHE_GCR_WIDEMEM) != 0 ? 128 : 64;
	acp->ac_epic_pass2 =
	    (REGVAL(EPIC_DCSR) & EPIC_DCSR_PASS2) != 0;

	acp->ac_haxr1 = REGVAL(EPIC_HAXR1);
	acp->ac_haxr2 = REGVAL(EPIC_HAXR2);

	/*
	 * Can't set up SGMAP data here; can be called before malloc().
	 * XXX THIS COMMENT NO LONGER MAKES SENSE.
	 */

	if (!acp->ac_initted) {
		/* don't do these twice since they set up extents */
		apecs_bus_io_init(&acp->ac_iot, acp);
		apecs_bus_mem_init(&acp->ac_memt, acp);
	}
	acp->ac_mallocsafe = mallocsafe;

	apecs_pci_init(&acp->ac_pc, acp);

	/* Turn off DMA window enables in PCI Base Reg 1. */
	REGVAL(EPIC_PCI_BASE_1) = 0;
	alpha_mb();

	/* XXX SGMAP? */

	/* XXX XXX BEGIN XXX XXX */
	{							/* XXX */
		extern vm_offset_t alpha_XXX_dmamap_or;		/* XXX */
		alpha_XXX_dmamap_or = 0x40000000;		/* XXX */
	}							/* XXX */
	/* XXX XXX END XXX XXX */

	acp->ac_initted = 1;
}

void
apecsattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct apecs_softc *sc = (struct apecs_softc *)self;
	struct apecs_config *acp;
	struct pcibus_attach_args pba;

	/* note that we've attached the chipset; can't have 2 APECSes. */
	apecsfound = 1;

	/*
	 * set up the chipset's info; done once at console init time
	 * (maybe), but doesn't hurt to do twice.
	 */
	acp = sc->sc_acp = &apecs_configuration;
	apecs_init(acp, 1);

	/* XXX SGMAP FOO */

	printf(": DECchip %s Core Logic chipset\n",
	    acp->ac_memwidth == 128 ? "21072" : "21071");
	printf("%s: DC21071-CA pass %d, %d-bit memory bus\n",
	    self->dv_xname, acp->ac_comanche_pass2 ? 2 : 1, acp->ac_memwidth);
	printf("%s: DC21071-DA pass %d\n", self->dv_xname,
	    acp->ac_epic_pass2 ? 2 : 1);
	/* XXX print bcache size */

	if (!acp->ac_epic_pass2)
		printf("WARNING: 21071-DA NOT PASS2... NO BETS...\n");

	switch (hwrpb->rpb_type) {
#ifdef DEC_2100_A50
	case ST_DEC_2100_A50:
		pci_2100_a50_pickintr(acp);
		break;
#endif

	default:
		panic("apecsattach: shouldn't be here, really...");
	}

	pba.pba_busname = "pci";
	pba.pba_iot = acp->ac_iot;
	pba.pba_memt = acp->ac_memt;
	pba.pba_pc = &acp->ac_pc;
	pba.pba_bus = 0;
	pba.pba_flags = PCI_FLAGS_IO_ENABLED | PCI_FLAGS_MEM_ENABLED;
	config_found(self, &pba, apecsprint);
}

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

	/* only PCIs can attach to APECSes; easy. */
	if (pnp)
		printf("%s at %s", pba->pba_busname, pnp);
	printf(" bus %d", pba->pba_bus);
	return (UNCONF);
}