110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
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/*
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* Copyright (C) 2000 Benno Rice
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* 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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "openfirm.h"
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static phandle_t curnode;
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/*
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* Initialise a device tree search. We do this by setting curpackage to point
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* to the root node.
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*/
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void
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ofw_devsearch_init(void)
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{
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curnode = OF_peer(0);
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}
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static phandle_t
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nextnode(phandle_t current)
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{
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phandle_t node;
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node = OF_child(current);
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if (node == -1)
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return(-1);
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if (node == 0) {
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node = OF_peer(current);
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if (node == -1)
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return(-1);
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if (node == 0) {
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phandle_t newnode;
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newnode = current;
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node = 0;
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while (node == 0) {
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node = OF_parent(newnode);
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if (node == -1 || node == 0)
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return ((int)node);
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newnode = node;
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node = OF_peer(newnode);
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}
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}
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}
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return(node);
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}
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/*
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* Search for devices in the device tree with a certain device_type.
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* Return their paths.
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*/
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int
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ofw_devsearch(const char *type, char *path)
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{
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phandle_t new;
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char str[32];
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int i;
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for (;;) {
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new = nextnode(curnode);
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if (new == 0 || new == -1) {
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return((int)new);
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}
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curnode = new;
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if ((i = OF_getprop(curnode, "device_type", str, 31)) != -1) {
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if (strncmp(str, type, 32) == 0) {
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if ((i = OF_package_to_path(curnode, path, 254)) == -1)
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return(-1);
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path[i] = '\0';
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return(1);
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}
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}
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}
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}
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