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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)

/*	$Id: spi.c,v 1.1.1.1 2008/03/04 16:09:35 nbrk Exp $	*/
/*
 * SPI bus.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/rwlock.h>

#include <dev/spivar.h>

struct spi_softc {
	struct device	sc_dev;
	struct spi_bus	*sc_bus;
};

int	spi_match(struct device *parent, void *cf, void *aux);
void	spi_attach(struct device *parent, struct device *self, void *aux);

struct cfattach	spibus_ca = {
	sizeof(struct spi_softc),
	spi_match,
	spi_attach,
	NULL,
	NULL
};

struct cfdriver	spibus_cd = {
	NULL,
	"spibus",
	DV_DULL
};


int
spi_match(struct device *parent, void *cf, void *aux)
{
	return(1);
}

void
spi_attach(struct device *parent, struct device *self, void *aux)
{
	struct spi_softc *sc = (struct spi_softc *)self;
	struct spibus_attach_args *sba = aux;

	sc->sc_bus = sba->sba_bus;
	sba->sba_spisc = sc;

	printf("\n");

	/* attach slave */
	config_found(&sc->sc_dev, sba, spibus_print);
}

int
spibus_print(void *aux, const char *pnp)
{
	return(QUIET);
}

int
spi_shift_1(void *arg, uint8_t data)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	/*
	 * TODO: locking.
	 */

	return(sb->bus_shift_1(sb->bus_cookie, data));
}

int
spi_acquire(void *arg)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	return(sb->bus_acquire(sb->bus_cookie));
}

void
spi_release(void *arg)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	return(sb->bus_release(sb->bus_cookie));
}