234 lines
7.0 KiB
C
234 lines
7.0 KiB
C
/*
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cons.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/bus.h>
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#include <machine/frame.h>
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#include <machine/nexusvar.h>
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#include <machine/resource.h>
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/*
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* The nexus (which is a pseudo-bus actually) iterates over the nodes that
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* exist in OpenFirmware and adds them as devices to this bus so that drivers
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* can be attached to them.
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*
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* Maybe this code should get into dev/ofw to some extent, as some of it should
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* work for all OpenFirmware based machines...
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*/
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static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");
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struct nexus_devinfo {
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phandle_t ndi_node;
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/* Some common properties. */
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char *ndi_name;
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char *ndi_device_type;
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};
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struct nexus_softc {
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};
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static int nexus_probe(device_t);
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static void nexus_probe_nomatch(device_t, device_t);
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static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
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static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
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static device_method_t nexus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, nexus_probe),
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DEVMETHOD(device_attach, bus_generic_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface. Resource management is business of the children... */
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch),
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DEVMETHOD(bus_read_ivar, nexus_read_ivar),
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DEVMETHOD(bus_write_ivar, nexus_write_ivar),
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{ 0, 0 }
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};
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static driver_t nexus_driver = {
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"nexus",
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nexus_methods,
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sizeof(struct nexus_softc),
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};
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static devclass_t nexus_devclass;
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DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
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static int
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nexus_probe(device_t dev)
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{
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phandle_t root;
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phandle_t child, new_node, temp_node;
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device_t cdev;
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struct nexus_devinfo *dinfo;
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struct nexus_softc *sc;
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char *name, *type;
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if ((root = OF_peer(0)) == -1)
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panic("nexus_probe: OF_peer failed.");
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child = root;
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while (child != 0) {
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OF_getprop_alloc(child, "name", 1, (void **)&name);
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OF_getprop_alloc(child, "device_type", 1, (void **)&type);
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cdev = device_add_child(dev, NULL, -1);
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if (cdev != NULL) {
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dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
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dinfo->ndi_node = child;
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dinfo->ndi_name = name;
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dinfo->ndi_device_type = type;
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device_set_ivars(cdev, dinfo);
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} else
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free(name, M_OFWPROP);
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next:
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new_node = OF_child(child);
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if (new_node == -1)
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panic("nexus_probe: OF_child return -1");
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if (new_node == 0)
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new_node = OF_peer(child);
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if (new_node == 0) {
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temp_node = child;
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while (new_node == 0) {
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temp_node = OF_parent(temp_node);
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if (temp_node == 0)
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break;
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new_node = OF_peer(temp_node);
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}
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}
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child = new_node;
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}
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device_set_desc(dev, "OpenFirmware Nexus device");
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return (0);
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}
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static void
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nexus_probe_nomatch(device_t dev, device_t child)
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{
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char *name, *type;
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if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME,
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(uintptr_t *)&name) != 0 ||
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BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE,
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(uintptr_t *)&type) != 0)
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return;
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if (type == NULL)
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type = "(unknown)";
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#if 0
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device_printf(dev, "<%s>, type %s (no driver attached)\n",
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name, type);
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#endif
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}
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static int
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nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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struct nexus_devinfo *dinfo;
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if ((dinfo = device_get_ivars(child)) == 0)
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return (ENOENT);
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switch (which) {
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case NEXUS_IVAR_NODE:
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*result = dinfo->ndi_node;
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break;
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case NEXUS_IVAR_NAME:
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*result = (uintptr_t)dinfo->ndi_name;
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break;
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case NEXUS_IVAR_DEVICE_TYPE:
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*result = (uintptr_t)dinfo->ndi_device_type;
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break;
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default:
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return (ENOENT);
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}
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return 0;
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}
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static int
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nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
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{
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struct nexus_devinfo *dinfo;
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if ((dinfo = device_get_ivars(child)) == 0)
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return (ENOENT);
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switch (which) {
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case NEXUS_IVAR_NODE:
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case NEXUS_IVAR_NAME:
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case NEXUS_IVAR_DEVICE_TYPE:
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return (EINVAL);
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default:
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return (ENOENT);
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}
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return 0;
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}
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