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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/* $OpenBSD: mcclock_ioasic.c,v 1.6 2002/05/02 22:56:06 miod Exp $ */
/* $NetBSD: mcclock_ioasic.c,v 1.9 2000/07/04 02:37:51 nisimura Exp $ */

/*
 * Copyright (c) 1994, 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 <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <dev/dec/clockvar.h>
#include <dev/dec/mcclockvar.h>
#include <dev/ic/mc146818reg.h>
#include <dev/tc/tcvar.h> 
#include <dev/tc/ioasicvar.h>                   /* XXX */

struct mcclock_ioasic_clockdatum {
	u_char	datum;
	char	pad[3];
};

struct mcclock_ioasic_softc {
	struct mcclock_softc	sc_mcclock;

	struct mcclock_ioasic_clockdatum *sc_dp;
};

int	mcclock_ioasic_match(struct device *, void *, void *);
void	mcclock_ioasic_attach(struct device *, struct device *, void *);

struct cfattach mcclock_ioasic_ca = {
	sizeof (struct mcclock_ioasic_softc), mcclock_ioasic_match,
	    mcclock_ioasic_attach, 
};

void	mcclock_ioasic_write(struct mcclock_softc *, u_int, u_int);
u_int	mcclock_ioasic_read(struct mcclock_softc *, u_int);

const struct mcclock_busfns mcclock_ioasic_busfns = {
	mcclock_ioasic_write, mcclock_ioasic_read,
};

int
mcclock_ioasic_match(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct ioasicdev_attach_args *d = aux;

	if (strncmp("TOY_RTC ", d->iada_modname, TC_ROM_LLEN))
		return (0);

	return (1);
}

void
mcclock_ioasic_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct ioasicdev_attach_args *ioasicdev = aux;
	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)self;

	sc->sc_dp = (struct mcclock_ioasic_clockdatum *)ioasicdev->iada_addr;

	mcclock_attach(&sc->sc_mcclock, &mcclock_ioasic_busfns);
}

void
mcclock_ioasic_write(dev, reg, datum)
	struct mcclock_softc *dev;
	u_int reg, datum;
{
	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)dev;

	sc->sc_dp[reg].datum = datum;
}

u_int
mcclock_ioasic_read(dev, reg)
	struct mcclock_softc *dev;
	u_int reg;
{
	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)dev;

	return (sc->sc_dp[reg].datum);
}