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1894 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1894 jermar 3
 * 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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ofw
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 * @{
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 */
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/**
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 * @file
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 * @brief   OpenFirmware device tree navigation.
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 *
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 */
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1895 jermar 38
#include <genarch/ofw/ofw_tree.h>
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#include <arch/memstr.h>
1972 jermar 40
#include <mm/slab.h>
1895 jermar 41
#include <func.h>
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#include <print.h>
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#include <panic.h>
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#define PATH_MAX_LEN    80
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#define NAME_BUF_LEN    50
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static ofw_tree_node_t *ofw_root;
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void ofw_tree_init(ofw_tree_node_t *root)
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{
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    ofw_root = root;
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}
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1896 jermar 55
/** Get OpenFirmware node property.
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 *
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 * @param node Node in which to lookup the property.
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 * @param name Name of the property.
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 *
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 * @return Pointer to the property structure or NULL if no such property.
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 */
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ofw_tree_property_t *ofw_tree_getprop(const ofw_tree_node_t *node, const char *name)
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{
2745 decky 64
    unsigned int i;
1896 jermar 65
 
66
    for (i = 0; i < node->properties; i++) {
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        if (strcmp(node->property[i].name, name) == 0)
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            return &node->property[i];
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    }
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71
    return NULL;
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}
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1895 jermar 74
/** Return value of the 'name' property.
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 *
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 * @param node Node of interest.
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 *
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 * @return Value of the 'name' property belonging to the node.
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 */
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const char *ofw_tree_node_name(const ofw_tree_node_t *node)
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{
1896 jermar 82
    ofw_tree_property_t *prop;
1895 jermar 83
 
1896 jermar 84
    prop = ofw_tree_getprop(node, "name");
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    if (!prop)
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        panic("Node without name property.\n");
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    if (prop->size < 2)
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        panic("Invalid name property.\n");
1895 jermar 90
 
1896 jermar 91
    return prop->value;
1895 jermar 92
}
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/** Lookup child of given name.
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 *
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 * @param node Node whose child is being looked up.
1896 jermar 97
 * @param name Name of the child being looked up.
1895 jermar 98
 *
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 * @return NULL if there is no such child or pointer to the matching child node.
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 */
1899 jermar 101
ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *name)
1895 jermar 102
{
103
    ofw_tree_node_t *cur;
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1896 jermar 105
    /*
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     * Try to find the disambigued name.
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     */
1895 jermar 108
    for (cur = node->child; cur; cur = cur->peer) {
1896 jermar 109
        if (strcmp(cur->da_name, name) == 0)
1895 jermar 110
            return cur;
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    }
112
 
1896 jermar 113
    /*
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     * Disambigued name not found.
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     * Lets try our luck with possibly ambiguous "name" property.
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     *
117
     * We need to do this because paths stored in "/aliases"
118
     * are not always fully-qualified.
119
     */
120
    for (cur = node->child; cur; cur = cur->peer) {
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        if (strcmp(ofw_tree_node_name(cur), name) == 0)
122
            return cur;
123
    }
124
 
1895 jermar 125
    return NULL;
126
}
127
 
1899 jermar 128
/** Lookup first child of given device type.
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 *
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 * @param node Node whose child is being looked up.
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 * @param name Device type of the child being looked up.
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 *
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 * @return NULL if there is no such child or pointer to the matching child node.
134
 */
135
ofw_tree_node_t *ofw_tree_find_child_by_device_type(ofw_tree_node_t *node, const char *name)
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{
137
    ofw_tree_node_t *cur;
138
    ofw_tree_property_t *prop;
139
 
140
    for (cur = node->child; cur; cur = cur->peer) {
141
        prop = ofw_tree_getprop(cur, "device_type");
142
        if (!prop || !prop->value)
143
            continue;
144
        if (strcmp(prop->value, name) == 0)
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            return cur;
146
    }
147
 
148
    return NULL;
149
}
150
 
1908 jermar 151
/** Lookup node with matching node_handle.
152
 *
1974 jermar 153
 * Child nodes are looked up recursively contrary to peer nodes that
154
 * are looked up iteratively to avoid stack overflow.
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 *
1908 jermar 156
 * @param root Root of the searched subtree.
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 * @param handle OpenFirmware handle.
158
 *
159
 * @return NULL if there is no such node or pointer to the matching node.
160
 */
161
ofw_tree_node_t *ofw_tree_find_node_by_handle(ofw_tree_node_t *root, uint32_t handle)
162
{
1974 jermar 163
    ofw_tree_node_t *cur;
1908 jermar 164
 
1974 jermar 165
    for (cur = root; cur; cur = cur->peer) {       
166
        if (cur->node_handle == handle)
167
            return cur;
1908 jermar 168
 
1974 jermar 169
        if (cur->child) {
170
            ofw_tree_node_t *node;
171
 
172
            node = ofw_tree_find_node_by_handle(cur->child, handle);
173
            if (node)
174
                return node;
175
        }
1908 jermar 176
    }
177
 
178
    return NULL;   
179
}
180
 
1899 jermar 181
/** Lookup first peer of given device type.
182
 *
183
 * @param node Node whose peer is being looked up.
184
 * @param name Device type of the child being looked up.
185
 *
186
 * @return NULL if there is no such child or pointer to the matching child node.
187
 */
188
ofw_tree_node_t *ofw_tree_find_peer_by_device_type(ofw_tree_node_t *node, const char *name)
189
{
190
    ofw_tree_node_t *cur;
191
    ofw_tree_property_t *prop;
192
 
193
    for (cur = node->peer; cur; cur = cur->peer) {
194
        prop = ofw_tree_getprop(cur, "device_type");
195
        if (!prop || !prop->value)
196
            continue;
197
        if (strcmp(prop->value, name) == 0)
198
            return cur;
199
    }
200
 
201
    return NULL;
202
}
203
 
204
 
1895 jermar 205
/** Lookup OpenFirmware node by its path.
206
 *
207
 * @param path Path to the node.
208
 *
209
 * @return NULL if there is no such node or pointer to the leaf node.
210
 */
211
ofw_tree_node_t *ofw_tree_lookup(const char *path)
212
{
213
    char buf[NAME_BUF_LEN+1];
214
    ofw_tree_node_t *node = ofw_root;
215
    index_t i, j;
216
 
217
    if (path[0] != '/')
218
        return NULL;
219
 
220
    for (i = 1; i < strlen(path) && node; i = j + 1) {
221
        for (j = i; j < strlen(path) && path[j] != '/'; j++)
222
            ;
223
        if (i == j) /* skip extra slashes */
224
            continue;
225
 
226
        memcpy(buf, &path[i], j - i);
227
        buf[j - i] = '\0';
228
        node = ofw_tree_find_child(node, buf);
229
    }
230
 
231
    return node;
232
}
233
 
1974 jermar 234
/** Print OpenFirmware device subtree rooted in a node.
1895 jermar 235
 *
1974 jermar 236
 * Child nodes are processed recursively and peer nodes are processed
237
 * iteratively in order to avoid stack overflow.
238
 *
1895 jermar 239
 * @param node Root of the subtree.
240
 * @param path Current path, NULL for the very root of the entire tree.
241
 */
242
static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path)
243
{
1972 jermar 244
    char *p;
1974 jermar 245
    const ofw_tree_node_t *cur;
1972 jermar 246
 
247
    p = (char *) malloc(PATH_MAX_LEN, 0);
248
 
1974 jermar 249
    for (cur = node; cur; cur = cur->peer) {
250
        if (cur->parent) {
251
            snprintf(p, PATH_MAX_LEN, "%s/%s", path, cur->da_name);
252
            printf("%s\n", p);
253
        } else {
254
            snprintf(p, PATH_MAX_LEN, "%s", cur->da_name);
255
            printf("/\n");
256
        }
257
 
258
        if (cur->child)
259
            ofw_tree_node_print(cur->child, p);
1895 jermar 260
    }
261
 
1972 jermar 262
    free(p);
1895 jermar 263
}
264
 
265
/** Print the structure of the OpenFirmware device tree. */
266
void ofw_tree_print(void)
267
{
268
    ofw_tree_node_print(ofw_root, NULL);
269
}
270
 
1894 jermar 271
/** @}
272
 */