of: unify phandle name in struct device_node
[linux-2.6.git] / arch / sparc / kernel / prom_common.c
1 /* prom_common.c: OF device tree support common code.
2  *
3  * Paul Mackerras       August 1996.
4  * Copyright (C) 1996-2005 Paul Mackerras.
5  *
6  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
7  *    {engebret|bergner}@us.ibm.com
8  *
9  *  Adapted for sparc by David S. Miller davem@davemloft.net
10  *
11  *      This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
22 #include <linux/of.h>
23 #include <asm/prom.h>
24 #include <asm/oplib.h>
25 #include <asm/leon.h>
26
27 #include "prom.h"
28
29 void (*prom_build_more)(struct device_node *dp, struct device_node ***nextp);
30
31 struct device_node *of_console_device;
32 EXPORT_SYMBOL(of_console_device);
33
34 char *of_console_path;
35 EXPORT_SYMBOL(of_console_path);
36
37 char *of_console_options;
38 EXPORT_SYMBOL(of_console_options);
39
40 struct device_node *of_find_node_by_phandle(phandle handle)
41 {
42         struct device_node *np;
43
44         for (np = allnodes; np; np = np->allnext)
45                 if (np->phandle == handle)
46                         break;
47
48         return np;
49 }
50 EXPORT_SYMBOL(of_find_node_by_phandle);
51
52 int of_getintprop_default(struct device_node *np, const char *name, int def)
53 {
54         struct property *prop;
55         int len;
56
57         prop = of_find_property(np, name, &len);
58         if (!prop || len != 4)
59                 return def;
60
61         return *(int *) prop->value;
62 }
63 EXPORT_SYMBOL(of_getintprop_default);
64
65 DEFINE_MUTEX(of_set_property_mutex);
66 EXPORT_SYMBOL(of_set_property_mutex);
67
68 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
69 {
70         struct property **prevp;
71         void *new_val;
72         int err;
73
74         new_val = kmalloc(len, GFP_KERNEL);
75         if (!new_val)
76                 return -ENOMEM;
77
78         memcpy(new_val, val, len);
79
80         err = -ENODEV;
81
82         mutex_lock(&of_set_property_mutex);
83         write_lock(&devtree_lock);
84         prevp = &dp->properties;
85         while (*prevp) {
86                 struct property *prop = *prevp;
87
88                 if (!strcasecmp(prop->name, name)) {
89                         void *old_val = prop->value;
90                         int ret;
91
92                         ret = prom_setprop(dp->phandle, name, val, len);
93
94                         err = -EINVAL;
95                         if (ret >= 0) {
96                                 prop->value = new_val;
97                                 prop->length = len;
98
99                                 if (OF_IS_DYNAMIC(prop))
100                                         kfree(old_val);
101
102                                 OF_MARK_DYNAMIC(prop);
103
104                                 err = 0;
105                         }
106                         break;
107                 }
108                 prevp = &(*prevp)->next;
109         }
110         write_unlock(&devtree_lock);
111         mutex_unlock(&of_set_property_mutex);
112
113         /* XXX Upate procfs if necessary... */
114
115         return err;
116 }
117 EXPORT_SYMBOL(of_set_property);
118
119 int of_find_in_proplist(const char *list, const char *match, int len)
120 {
121         while (len > 0) {
122                 int l;
123
124                 if (!strcmp(list, match))
125                         return 1;
126                 l = strlen(list) + 1;
127                 list += l;
128                 len -= l;
129         }
130         return 0;
131 }
132 EXPORT_SYMBOL(of_find_in_proplist);
133
134 unsigned int prom_unique_id;
135
136 static struct property * __init build_one_prop(phandle node, char *prev,
137                                                char *special_name,
138                                                void *special_val,
139                                                int special_len)
140 {
141         static struct property *tmp = NULL;
142         struct property *p;
143         const char *name;
144
145         if (tmp) {
146                 p = tmp;
147                 memset(p, 0, sizeof(*p) + 32);
148                 tmp = NULL;
149         } else {
150                 p = prom_early_alloc(sizeof(struct property) + 32);
151                 p->unique_id = prom_unique_id++;
152         }
153
154         p->name = (char *) (p + 1);
155         if (special_name) {
156                 strcpy(p->name, special_name);
157                 p->length = special_len;
158                 p->value = prom_early_alloc(special_len);
159                 memcpy(p->value, special_val, special_len);
160         } else {
161                 if (prev == NULL) {
162                         name = prom_firstprop(node, p->name);
163                 } else {
164                         name = prom_nextprop(node, prev, p->name);
165                 }
166
167                 if (!name || strlen(name) == 0) {
168                         tmp = p;
169                         return NULL;
170                 }
171 #ifdef CONFIG_SPARC32
172                 strcpy(p->name, name);
173 #endif
174                 p->length = prom_getproplen(node, p->name);
175                 if (p->length <= 0) {
176                         p->length = 0;
177                 } else {
178                         int len;
179
180                         p->value = prom_early_alloc(p->length + 1);
181                         len = prom_getproperty(node, p->name, p->value,
182                                                p->length);
183                         if (len <= 0)
184                                 p->length = 0;
185                         ((unsigned char *)p->value)[p->length] = '\0';
186                 }
187         }
188         return p;
189 }
190
191 static struct property * __init build_prop_list(phandle node)
192 {
193         struct property *head, *tail;
194
195         head = tail = build_one_prop(node, NULL,
196                                      ".node", &node, sizeof(node));
197
198         tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
199         tail = tail->next;
200         while(tail) {
201                 tail->next = build_one_prop(node, tail->name,
202                                             NULL, NULL, 0);
203                 tail = tail->next;
204         }
205
206         return head;
207 }
208
209 static char * __init get_one_property(phandle node, const char *name)
210 {
211         char *buf = "<NULL>";
212         int len;
213
214         len = prom_getproplen(node, name);
215         if (len > 0) {
216                 buf = prom_early_alloc(len);
217                 len = prom_getproperty(node, name, buf, len);
218         }
219
220         return buf;
221 }
222
223 static struct device_node * __init prom_create_node(phandle node,
224                                                     struct device_node *parent)
225 {
226         struct device_node *dp;
227
228         if (!node)
229                 return NULL;
230
231         dp = prom_early_alloc(sizeof(*dp));
232         dp->unique_id = prom_unique_id++;
233         dp->parent = parent;
234
235         kref_init(&dp->kref);
236
237         dp->name = get_one_property(node, "name");
238         dp->type = get_one_property(node, "device_type");
239         dp->phandle = node;
240
241         dp->properties = build_prop_list(node);
242
243         irq_trans_init(dp);
244
245         return dp;
246 }
247
248 char * __init build_full_name(struct device_node *dp)
249 {
250         int len, ourlen, plen;
251         char *n;
252
253         plen = strlen(dp->parent->full_name);
254         ourlen = strlen(dp->path_component_name);
255         len = ourlen + plen + 2;
256
257         n = prom_early_alloc(len);
258         strcpy(n, dp->parent->full_name);
259         if (!is_root_node(dp->parent)) {
260                 strcpy(n + plen, "/");
261                 plen++;
262         }
263         strcpy(n + plen, dp->path_component_name);
264
265         return n;
266 }
267
268 static struct device_node * __init prom_build_tree(struct device_node *parent,
269                                                    phandle node,
270                                                    struct device_node ***nextp)
271 {
272         struct device_node *ret = NULL, *prev_sibling = NULL;
273         struct device_node *dp;
274
275         while (1) {
276                 dp = prom_create_node(node, parent);
277                 if (!dp)
278                         break;
279
280                 if (prev_sibling)
281                         prev_sibling->sibling = dp;
282
283                 if (!ret)
284                         ret = dp;
285                 prev_sibling = dp;
286
287                 *(*nextp) = dp;
288                 *nextp = &dp->allnext;
289
290                 dp->path_component_name = build_path_component(dp);
291                 dp->full_name = build_full_name(dp);
292
293                 dp->child = prom_build_tree(dp, prom_getchild(node), nextp);
294
295                 if (prom_build_more)
296                         prom_build_more(dp, nextp);
297
298                 node = prom_getsibling(node);
299         }
300
301         return ret;
302 }
303
304 unsigned int prom_early_allocated __initdata;
305
306 void __init prom_build_devicetree(void)
307 {
308         struct device_node **nextp;
309
310         allnodes = prom_create_node(prom_root_node, NULL);
311         allnodes->path_component_name = "";
312         allnodes->full_name = "/";
313
314         nextp = &allnodes->allnext;
315         allnodes->child = prom_build_tree(allnodes,
316                                           prom_getchild(allnodes->phandle),
317                                           &nextp);
318         of_console_init();
319
320         printk("PROM: Built device tree with %u bytes of memory.\n",
321                prom_early_allocated);
322 }