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1894 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1894 jermar 3
 * All rights reserved.
4
 *
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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.
27
 */
28
 
29
/** @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>
39
#include <arch/memstr.h>
1972 jermar 40
#include <mm/slab.h>
4055 trochtova 41
#include <string.h>
1895 jermar 42
#include <print.h>
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#include <panic.h>
44
 
45
#define PATH_MAX_LEN    80
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#define NAME_BUF_LEN    50
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48
static ofw_tree_node_t *ofw_root;
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50
void ofw_tree_init(ofw_tree_node_t *root)
51
{
52
    ofw_root = root;
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}
54
 
1896 jermar 55
/** Get OpenFirmware node property.
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 *
4055 trochtova 57
 * @param node      Node in which to lookup the property.
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 * @param name      Name of the property.
1896 jermar 59
 *
4055 trochtova 60
 * @return      Pointer to the property structure or NULL if no such
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 *          property.
1896 jermar 62
 */
4055 trochtova 63
ofw_tree_property_t *
64
ofw_tree_getprop(const ofw_tree_node_t *node, const char *name)
1896 jermar 65
{
2745 decky 66
    unsigned int i;
1896 jermar 67
 
68
    for (i = 0; i < node->properties; i++) {
69
        if (strcmp(node->property[i].name, name) == 0)
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            return &node->property[i];
71
    }
72
 
73
    return NULL;
74
}
75
 
1895 jermar 76
/** Return value of the 'name' property.
77
 *
4055 trochtova 78
 * @param node      Node of interest.
1895 jermar 79
 *
4055 trochtova 80
 * @return      Value of the 'name' property belonging to the node.
1895 jermar 81
 */
82
const char *ofw_tree_node_name(const ofw_tree_node_t *node)
83
{
1896 jermar 84
    ofw_tree_property_t *prop;
1895 jermar 85
 
1896 jermar 86
    prop = ofw_tree_getprop(node, "name");
87
    if (!prop)
4055 trochtova 88
        panic("Node without name property.");
1896 jermar 89
 
90
    if (prop->size < 2)
4055 trochtova 91
        panic("Invalid name property.");
1895 jermar 92
 
1896 jermar 93
    return prop->value;
1895 jermar 94
}
95
 
96
/** Lookup child of given name.
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 *
4055 trochtova 98
 * @param node      Node whose child is being looked up.
99
 * @param name      Name of the child being looked up.
1895 jermar 100
 *
4055 trochtova 101
 * @return      NULL if there is no such child or pointer to the
102
 *          matching child node.
1895 jermar 103
 */
1899 jermar 104
ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *name)
1895 jermar 105
{
106
    ofw_tree_node_t *cur;
107
 
1896 jermar 108
    /*
109
     * Try to find the disambigued name.
110
     */
1895 jermar 111
    for (cur = node->child; cur; cur = cur->peer) {
1896 jermar 112
        if (strcmp(cur->da_name, name) == 0)
1895 jermar 113
            return cur;
114
    }
115
 
1896 jermar 116
    /*
117
     * Disambigued name not found.
118
     * Lets try our luck with possibly ambiguous "name" property.
119
     *
120
     * We need to do this because paths stored in "/aliases"
121
     * are not always fully-qualified.
122
     */
123
    for (cur = node->child; cur; cur = cur->peer) {
124
        if (strcmp(ofw_tree_node_name(cur), name) == 0)
125
            return cur;
126
    }
127
 
1895 jermar 128
    return NULL;
129
}
130
 
1899 jermar 131
/** Lookup first child of given device type.
132
 *
4055 trochtova 133
 * @param node      Node whose child is being looked up.
134
 * @param name      Device type of the child being looked up.
1899 jermar 135
 *
4055 trochtova 136
 * @return      NULL if there is no such child or pointer to the
137
 *          matching child node.
1899 jermar 138
 */
4055 trochtova 139
ofw_tree_node_t *
140
ofw_tree_find_child_by_device_type(ofw_tree_node_t *node, const char *name)
1899 jermar 141
{
142
    ofw_tree_node_t *cur;
143
    ofw_tree_property_t *prop;
144
 
145
    for (cur = node->child; cur; cur = cur->peer) {
146
        prop = ofw_tree_getprop(cur, "device_type");
147
        if (!prop || !prop->value)
148
            continue;
149
        if (strcmp(prop->value, name) == 0)
150
            return cur;
151
    }
152
 
153
    return NULL;
154
}
155
 
1908 jermar 156
/** Lookup node with matching node_handle.
157
 *
1974 jermar 158
 * Child nodes are looked up recursively contrary to peer nodes that
159
 * are looked up iteratively to avoid stack overflow.
160
 *
4055 trochtova 161
 * @param root      Root of the searched subtree.
162
 * @param handle    OpenFirmware handle.
1908 jermar 163
 *
4055 trochtova 164
 * @return      NULL if there is no such node or pointer to the matching
165
 *          node.
1908 jermar 166
 */
4055 trochtova 167
ofw_tree_node_t *
168
ofw_tree_find_node_by_handle(ofw_tree_node_t *root, uint32_t handle)
1908 jermar 169
{
1974 jermar 170
    ofw_tree_node_t *cur;
1908 jermar 171
 
1974 jermar 172
    for (cur = root; cur; cur = cur->peer) {       
173
        if (cur->node_handle == handle)
174
            return cur;
1908 jermar 175
 
1974 jermar 176
        if (cur->child) {
177
            ofw_tree_node_t *node;
178
 
179
            node = ofw_tree_find_node_by_handle(cur->child, handle);
180
            if (node)
181
                return node;
182
        }
1908 jermar 183
    }
184
 
185
    return NULL;   
186
}
187
 
1899 jermar 188
/** Lookup first peer of given device type.
189
 *
4055 trochtova 190
 * @param node      Node whose peer is being looked up.
191
 * @param name      Device type of the child being looked up.
1899 jermar 192
 *
4055 trochtova 193
 * @return      NULL if there is no such child or pointer to the
194
 *          matching child node.
1899 jermar 195
 */
4055 trochtova 196
ofw_tree_node_t *
197
ofw_tree_find_peer_by_device_type(ofw_tree_node_t *node, const char *name)
1899 jermar 198
{
199
    ofw_tree_node_t *cur;
200
    ofw_tree_property_t *prop;
201
 
202
    for (cur = node->peer; cur; cur = cur->peer) {
203
        prop = ofw_tree_getprop(cur, "device_type");
204
        if (!prop || !prop->value)
205
            continue;
206
        if (strcmp(prop->value, name) == 0)
207
            return cur;
208
    }
209
 
210
    return NULL;
211
}
212
 
213
 
4055 trochtova 214
/** Lookup first peer of given name.
215
 *
216
 * @param node      Node whose peer is being looked up.
217
 * @param name      Name of the child being looked up.
218
 *
219
 * @return      NULL if there is no such peer or pointer to the matching
220
 *          peer node.
221
 */
222
ofw_tree_node_t *
223
ofw_tree_find_peer_by_name(ofw_tree_node_t *node, const char *name)
224
{
225
    ofw_tree_node_t *cur;
226
    ofw_tree_property_t *prop;
227
 
228
    for (cur = node->peer; cur; cur = cur->peer) {
229
        prop = ofw_tree_getprop(cur, "name");
230
        if (!prop || !prop->value)
231
            continue;
232
        if (strcmp(prop->value, name) == 0)
233
            return cur;
234
    }
235
 
236
    return NULL;
237
}
238
 
1895 jermar 239
/** Lookup OpenFirmware node by its path.
240
 *
4055 trochtova 241
 * @param path      Path to the node.
1895 jermar 242
 *
4055 trochtova 243
 * @return      NULL if there is no such node or pointer to the leaf
244
 *          node.
1895 jermar 245
 */
246
ofw_tree_node_t *ofw_tree_lookup(const char *path)
247
{
4055 trochtova 248
    char buf[NAME_BUF_LEN + 1];
1895 jermar 249
    ofw_tree_node_t *node = ofw_root;
250
    index_t i, j;
251
 
252
    if (path[0] != '/')
253
        return NULL;
254
 
255
    for (i = 1; i < strlen(path) && node; i = j + 1) {
256
        for (j = i; j < strlen(path) && path[j] != '/'; j++)
257
            ;
258
        if (i == j) /* skip extra slashes */
259
            continue;
260
 
261
        memcpy(buf, &path[i], j - i);
262
        buf[j - i] = '\0';
263
        node = ofw_tree_find_child(node, buf);
264
    }
265
 
266
    return node;
267
}
268
 
1974 jermar 269
/** Print OpenFirmware device subtree rooted in a node.
1895 jermar 270
 *
1974 jermar 271
 * Child nodes are processed recursively and peer nodes are processed
272
 * iteratively in order to avoid stack overflow.
273
 *
4055 trochtova 274
 * @param node      Root of the subtree.
275
 * @param path      Current path, NULL for the very root of the entire tree.
1895 jermar 276
 */
277
static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path)
278
{
1972 jermar 279
    char *p;
1974 jermar 280
    const ofw_tree_node_t *cur;
1972 jermar 281
 
282
    p = (char *) malloc(PATH_MAX_LEN, 0);
283
 
1974 jermar 284
    for (cur = node; cur; cur = cur->peer) {
285
        if (cur->parent) {
286
            snprintf(p, PATH_MAX_LEN, "%s/%s", path, cur->da_name);
287
            printf("%s\n", p);
288
        } else {
289
            snprintf(p, PATH_MAX_LEN, "%s", cur->da_name);
290
            printf("/\n");
291
        }
292
 
293
        if (cur->child)
294
            ofw_tree_node_print(cur->child, p);
1895 jermar 295
    }
296
 
1972 jermar 297
    free(p);
1895 jermar 298
}
299
 
300
/** Print the structure of the OpenFirmware device tree. */
301
void ofw_tree_print(void)
302
{
303
    ofw_tree_node_print(ofw_root, NULL);
304
}
305
 
1894 jermar 306
/** @}
307
 */