/*	$NetBSD: lebuffer.c,v 1.25 2005/12/11 12:23:44 christos Exp $ */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Paul Kranenburg.
 *
 * 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lebuffer.c,v 1.25 2005/12/11 12:23:44 christos Exp $");

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

#include <machine/bus.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>

int	lebufprint(void *, const char *);
int	lebufmatch(struct device *, struct cfdata *, void *);
void	lebufattach(struct device *, struct device *, void *);

CFATTACH_DECL(lebuffer, sizeof(struct lebuf_softc),
    lebufmatch, lebufattach, NULL, NULL);

int
lebufprint(aux, busname)
	void *aux;
	const char *busname;
{

	sbus_print(aux, busname);
	return (UNCONF);
}

int
lebufmatch(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{
	struct sbus_attach_args *sa = aux;

	return (strcmp(cf->cf_name, sa->sa_name) == 0);
}

/*
 * Attach all the sub-devices we can find
 */
void
lebufattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct sbus_attach_args *sa = aux;
	struct lebuf_softc *sc = (void *)self;
	int node;
	int sbusburst;
	bus_space_tag_t bt = sa->sa_bustag;
	bus_dma_tag_t	dt = sa->sa_dmatag;
	bus_space_handle_t bh;

	if (sbus_bus_map(bt, sa->sa_slot, sa->sa_offset, sa->sa_size,
			 BUS_SPACE_MAP_LINEAR, &bh) != 0) {
		printf("%s: attach: cannot map registers\n", self->dv_xname);
		return;
	}

	/*
	 * This device's "register space" is just a buffer where the
	 * Lance ring-buffers can be stored. Note the buffer's location
	 * and size, so the `le' driver can pick them up.
	 */
	sc->sc_buffer = bus_space_vaddr(bt, bh);
	sc->sc_bufsiz = sa->sa_size;

	node = sc->sc_node = sa->sa_node;

	/*
	 * Get transfer burst size from PROM
	 */
	sbusburst = ((struct sbus_softc *)parent)->sc_burst;
	if (sbusburst == 0)
		sbusburst = SBUS_BURST_32 - 1; /* 1->16 */

	sc->sc_burst = prom_getpropint(node, "burst-sizes", -1);
	if (sc->sc_burst == -1)
		/* take SBus burst sizes */
		sc->sc_burst = sbusburst;

	/* Clamp at parent's burst sizes */
	sc->sc_burst &= sbusburst;

	sbus_establish(&sc->sc_sd, &sc->sc_dev);

	printf(": %dK memory\n", sc->sc_bufsiz / 1024);

	/* search through children */
	for (node = firstchild(node); node; node = nextsibling(node)) {
		struct sbus_attach_args sax;
		sbus_setup_attach_args((struct sbus_softc *)parent,
				       bt, dt, node, &sax);
		(void)config_found(&sc->sc_dev, (void *)&sax, lebufprint);
		sbus_destroy_attach_args(&sax);
	}
}