xref: /src/sys/dev/ofw/ofbus.c

/*	$NetBSD: ofbus.c,v 1.29 2021/04/30 02:34:12 thorpej Exp $	*/

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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 TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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: ofbus.c,v 1.29 2021/04/30 02:34:12 thorpej Exp $");

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

#include <dev/ofw/openfirm.h>

int ofbus_match(device_t, cfdata_t, void *);
void ofbus_attach(device_t, device_t, void *);
static int ofbus_print(void *, const char *);

CFATTACH_DECL_NEW(ofbus, 0,
    ofbus_match, ofbus_attach, NULL, NULL);

static int
ofbus_print(void *aux, const char *pnp)
{
	struct ofbus_attach_args *oba = aux;

	if (pnp)
		aprint_normal("%s at %s", oba->oba_ofname, pnp);
	else
		aprint_normal(" (%s)", oba->oba_ofname);
	return UNCONF;
}

int
ofbus_match(device_t parent, cfdata_t cf, void *aux)
{
	struct ofbus_attach_args *oba = aux;

	if (strcmp(oba->oba_busname, "ofw"))
		return (0);
	if (!OF_child(oba->oba_phandle))
		return (0);
	return (1);
}

#if defined(__arm32__)		/* XXX temporary */
#define	_OFBUS_ROOT_MACHDEP_SKIPNAMES					\
	"udp",								\
	"cpus",								\
	"mmu",								\
	"memory"
#endif /* __arm32__ */

/*
 * Skip some well-known nodes in the root that contain no useful
 * child devices.
 */
static bool
ofbus_skip_node_in_root(int phandle, char *name, size_t namesize)
{
	static const char * const skip_names[] = {
		"aliases",
		"options",
		"openprom",
		"chosen",
		"packages",
#ifdef _OFBUS_ROOT_MACHDEP_SKIPNAMES
		_OFBUS_ROOT_MACHDEP_SKIPNAMES
#endif
	};
	u_int i;

	name[0] = '\0';
	if (OF_getprop(phandle, "name", name, namesize) <= 0) {
		return false;
	}

	for (i = 0; i < __arraycount(skip_names); i++) {
		if (strcmp(name, skip_names[i]) == 0) {
			return true;
		}
	}
	return false;
}

void
ofbus_attach(device_t parent, device_t dev, void *aux)
{
	struct ofbus_attach_args *oba = aux;
	struct ofbus_attach_args oba2;
	char name[64], type[64];
	int child, units;
	bool rootbus;

	rootbus = oba->oba_phandle == OF_finddevice("/");

	/*
	 * If we are the OFW root, get the banner-name and model
	 * properties and display them for informational purposes.
	 */
	if (rootbus) {
		int model_len, banner_len;

		model_len = OF_getprop(oba->oba_phandle, "model",
		    name, sizeof(name));
		banner_len = OF_getprop(oba->oba_phandle, "banner-name",
		    type, sizeof(type));

		if (banner_len > 0 && model_len > 0) {
			printf(": %s (%s)\n", type, name);
		} else if (model_len > 0) {
			printf(": %s\n", name);
		} else {
			printf("\n");
		}
	} else {
		printf("\n");
	}

	/*
	 * This is a hack to make the probe work on the scsi (and ide) bus.
	 * YES, I THINK IT IS A BUG IN THE OPENFIRMWARE TO NOT PROBE ALL
	 * DEVICES ON THESE BUSSES.
	 */
	units = 1;
	name[0] = 0;
	if (OF_getprop(oba->oba_phandle, "name", name, sizeof name) > 0) {
		if (!strcmp(name, "scsi"))
			units = 7; /* What about wide or hostid != 7?	XXX */
		else if (!strcmp(name, "ide"))
			units = 2;
	}

	/* attach displays first */
	for (child = OF_child(oba->oba_phandle); child != 0;
	     child = OF_peer(child)) {
		oba2.oba_busname = "ofw";
		type[0] = 0;
		if (OF_getprop(child, "device_type", type, sizeof(type)) <= 0)
			continue;
		if (strncmp(type, "display", sizeof(type)) != 0)
			continue;
		of_packagename(child, name, sizeof name);
		oba2.oba_phandle = child;
		for (oba2.oba_unit = 0; oba2.oba_unit < units;
		     oba2.oba_unit++) {
			if (units > 1) {
				snprintf(oba2.oba_ofname,
				    sizeof(oba2.oba_ofname), "%s@%d", name,
				    oba2.oba_unit);
			} else {
				strlcpy(oba2.oba_ofname, name,
				    sizeof(oba2.oba_ofname));
			}
			config_found(dev, &oba2, ofbus_print,
			    CFARG_DEVHANDLE, devhandle_from_of(child),
			    CFARG_EOL);
		}
	}

	/* now the rest */
	for (child = OF_child(oba->oba_phandle); child != 0;
	     child = OF_peer(child)) {
		oba2.oba_busname = "ofw";
		type[0] = 0;
		if (OF_getprop(child, "device_type", type, sizeof(type)) > 0) {
			if (strncmp(type, "display", sizeof(type)) == 0)
				continue;
		}
		if (rootbus &&
		    ofbus_skip_node_in_root(child, name, sizeof(name))) {
			continue;
		}
		of_packagename(child, name, sizeof name);
		oba2.oba_phandle = child;
		for (oba2.oba_unit = 0; oba2.oba_unit < units;
		     oba2.oba_unit++) {
			if (units > 1) {
				snprintf(oba2.oba_ofname,
				    sizeof(oba2.oba_ofname), "%s@%d", name,
				    oba2.oba_unit);
			} else {
				strlcpy(oba2.oba_ofname, name,
				    sizeof(oba2.oba_ofname));
			}
			config_found(dev, &oba2, ofbus_print,
			    CFARG_DEVHANDLE, devhandle_from_of(child),
			    CFARG_EOL);
		}
	}
}