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dfa76060 DM |
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 | ||
26 | #include "prom.h" | |
27 | ||
ad07aed8 DM |
28 | struct device_node *of_console_device; |
29 | EXPORT_SYMBOL(of_console_device); | |
30 | ||
31 | char *of_console_path; | |
32 | EXPORT_SYMBOL(of_console_path); | |
33 | ||
34 | char *of_console_options; | |
35 | EXPORT_SYMBOL(of_console_options); | |
36 | ||
dfa76060 DM |
37 | struct device_node *of_find_node_by_phandle(phandle handle) |
38 | { | |
39 | struct device_node *np; | |
40 | ||
41 | for (np = allnodes; np; np = np->allnext) | |
42 | if (np->node == handle) | |
43 | break; | |
44 | ||
45 | return np; | |
46 | } | |
47 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
48 | ||
49 | int of_getintprop_default(struct device_node *np, const char *name, int def) | |
50 | { | |
51 | struct property *prop; | |
52 | int len; | |
53 | ||
54 | prop = of_find_property(np, name, &len); | |
55 | if (!prop || len != 4) | |
56 | return def; | |
57 | ||
58 | return *(int *) prop->value; | |
59 | } | |
60 | EXPORT_SYMBOL(of_getintprop_default); | |
61 | ||
62 | DEFINE_MUTEX(of_set_property_mutex); | |
63 | EXPORT_SYMBOL(of_set_property_mutex); | |
64 | ||
65 | int of_set_property(struct device_node *dp, const char *name, void *val, int len) | |
66 | { | |
67 | struct property **prevp; | |
68 | void *new_val; | |
69 | int err; | |
70 | ||
71 | new_val = kmalloc(len, GFP_KERNEL); | |
72 | if (!new_val) | |
73 | return -ENOMEM; | |
74 | ||
75 | memcpy(new_val, val, len); | |
76 | ||
77 | err = -ENODEV; | |
78 | ||
79 | write_lock(&devtree_lock); | |
80 | prevp = &dp->properties; | |
81 | while (*prevp) { | |
82 | struct property *prop = *prevp; | |
83 | ||
84 | if (!strcasecmp(prop->name, name)) { | |
85 | void *old_val = prop->value; | |
86 | int ret; | |
87 | ||
88 | mutex_lock(&of_set_property_mutex); | |
89 | ret = prom_setprop(dp->node, name, val, len); | |
90 | mutex_unlock(&of_set_property_mutex); | |
91 | ||
92 | err = -EINVAL; | |
93 | if (ret >= 0) { | |
94 | prop->value = new_val; | |
95 | prop->length = len; | |
96 | ||
97 | if (OF_IS_DYNAMIC(prop)) | |
98 | kfree(old_val); | |
99 | ||
100 | OF_MARK_DYNAMIC(prop); | |
101 | ||
102 | err = 0; | |
103 | } | |
104 | break; | |
105 | } | |
106 | prevp = &(*prevp)->next; | |
107 | } | |
108 | write_unlock(&devtree_lock); | |
109 | ||
110 | /* XXX Upate procfs if necessary... */ | |
111 | ||
112 | return err; | |
113 | } | |
114 | EXPORT_SYMBOL(of_set_property); | |
115 | ||
116 | int of_find_in_proplist(const char *list, const char *match, int len) | |
117 | { | |
118 | while (len > 0) { | |
119 | int l; | |
120 | ||
121 | if (!strcmp(list, match)) | |
122 | return 1; | |
123 | l = strlen(list) + 1; | |
124 | list += l; | |
125 | len -= l; | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | EXPORT_SYMBOL(of_find_in_proplist); | |
130 | ||
e5ff0fe3 | 131 | unsigned int prom_unique_id; |
b9e5567c DM |
132 | |
133 | static struct property * __init build_one_prop(phandle node, char *prev, | |
134 | char *special_name, | |
135 | void *special_val, | |
136 | int special_len) | |
137 | { | |
138 | static struct property *tmp = NULL; | |
139 | struct property *p; | |
140 | const char *name; | |
141 | ||
142 | if (tmp) { | |
143 | p = tmp; | |
144 | memset(p, 0, sizeof(*p) + 32); | |
145 | tmp = NULL; | |
146 | } else { | |
147 | p = prom_early_alloc(sizeof(struct property) + 32); | |
148 | p->unique_id = prom_unique_id++; | |
149 | } | |
150 | ||
151 | p->name = (char *) (p + 1); | |
152 | if (special_name) { | |
153 | strcpy(p->name, special_name); | |
154 | p->length = special_len; | |
155 | p->value = prom_early_alloc(special_len); | |
156 | memcpy(p->value, special_val, special_len); | |
157 | } else { | |
b9e5567c | 158 | if (prev == NULL) { |
47cd5265 | 159 | name = prom_firstprop(node, p->name); |
b9e5567c | 160 | } else { |
47cd5265 | 161 | name = prom_nextprop(node, prev, p->name); |
b9e5567c | 162 | } |
47cd5265 | 163 | |
b9e5567c DM |
164 | if (strlen(name) == 0) { |
165 | tmp = p; | |
166 | return NULL; | |
167 | } | |
168 | #ifdef CONFIG_SPARC32 | |
169 | strcpy(p->name, name); | |
170 | #endif | |
171 | p->length = prom_getproplen(node, p->name); | |
172 | if (p->length <= 0) { | |
173 | p->length = 0; | |
174 | } else { | |
175 | int len; | |
176 | ||
177 | p->value = prom_early_alloc(p->length + 1); | |
178 | len = prom_getproperty(node, p->name, p->value, | |
179 | p->length); | |
180 | if (len <= 0) | |
181 | p->length = 0; | |
182 | ((unsigned char *)p->value)[p->length] = '\0'; | |
183 | } | |
184 | } | |
185 | return p; | |
186 | } | |
187 | ||
7d9439d5 | 188 | static struct property * __init build_prop_list(phandle node) |
b9e5567c DM |
189 | { |
190 | struct property *head, *tail; | |
191 | ||
192 | head = tail = build_one_prop(node, NULL, | |
193 | ".node", &node, sizeof(node)); | |
194 | ||
195 | tail->next = build_one_prop(node, NULL, NULL, NULL, 0); | |
196 | tail = tail->next; | |
197 | while(tail) { | |
198 | tail->next = build_one_prop(node, tail->name, | |
199 | NULL, NULL, 0); | |
200 | tail = tail->next; | |
201 | } | |
202 | ||
203 | return head; | |
204 | } | |
7d9439d5 DM |
205 | |
206 | static char * __init get_one_property(phandle node, const char *name) | |
207 | { | |
208 | char *buf = "<NULL>"; | |
209 | int len; | |
210 | ||
211 | len = prom_getproplen(node, name); | |
212 | if (len > 0) { | |
213 | buf = prom_early_alloc(len); | |
214 | len = prom_getproperty(node, name, buf, len); | |
215 | } | |
216 | ||
217 | return buf; | |
218 | } | |
219 | ||
23dc758e DM |
220 | static struct device_node * __init prom_create_node(phandle node, |
221 | struct device_node *parent) | |
7d9439d5 DM |
222 | { |
223 | struct device_node *dp; | |
224 | ||
225 | if (!node) | |
226 | return NULL; | |
227 | ||
228 | dp = prom_early_alloc(sizeof(*dp)); | |
229 | dp->unique_id = prom_unique_id++; | |
230 | dp->parent = parent; | |
231 | ||
232 | kref_init(&dp->kref); | |
233 | ||
234 | dp->name = get_one_property(node, "name"); | |
235 | dp->type = get_one_property(node, "device_type"); | |
236 | dp->node = node; | |
237 | ||
7d9439d5 DM |
238 | dp->properties = build_prop_list(node); |
239 | ||
bf944c37 DM |
240 | irq_trans_init(dp); |
241 | ||
7d9439d5 DM |
242 | return dp; |
243 | } | |
6524036a DM |
244 | |
245 | static char * __init build_full_name(struct device_node *dp) | |
246 | { | |
247 | int len, ourlen, plen; | |
248 | char *n; | |
249 | ||
250 | plen = strlen(dp->parent->full_name); | |
251 | ourlen = strlen(dp->path_component_name); | |
252 | len = ourlen + plen + 2; | |
253 | ||
254 | n = prom_early_alloc(len); | |
255 | strcpy(n, dp->parent->full_name); | |
256 | if (!is_root_node(dp->parent)) { | |
257 | strcpy(n + plen, "/"); | |
258 | plen++; | |
259 | } | |
260 | strcpy(n + plen, dp->path_component_name); | |
261 | ||
262 | return n; | |
263 | } | |
264 | ||
23dc758e DM |
265 | static struct device_node * __init prom_build_tree(struct device_node *parent, |
266 | phandle node, | |
267 | struct device_node ***nextp) | |
6524036a DM |
268 | { |
269 | struct device_node *ret = NULL, *prev_sibling = NULL; | |
270 | struct device_node *dp; | |
271 | ||
272 | while (1) { | |
273 | dp = prom_create_node(node, parent); | |
274 | if (!dp) | |
275 | break; | |
276 | ||
277 | if (prev_sibling) | |
278 | prev_sibling->sibling = dp; | |
279 | ||
280 | if (!ret) | |
281 | ret = dp; | |
282 | prev_sibling = dp; | |
283 | ||
284 | *(*nextp) = dp; | |
285 | *nextp = &dp->allnext; | |
286 | ||
287 | dp->path_component_name = build_path_component(dp); | |
288 | dp->full_name = build_full_name(dp); | |
289 | ||
290 | dp->child = prom_build_tree(dp, prom_getchild(node), nextp); | |
291 | ||
292 | node = prom_getsibling(node); | |
293 | } | |
294 | ||
295 | return ret; | |
296 | } | |
23dc758e DM |
297 | |
298 | unsigned int prom_early_allocated __initdata; | |
299 | ||
300 | void __init prom_build_devicetree(void) | |
301 | { | |
302 | struct device_node **nextp; | |
303 | ||
304 | allnodes = prom_create_node(prom_root_node, NULL); | |
305 | allnodes->path_component_name = ""; | |
306 | allnodes->full_name = "/"; | |
307 | ||
308 | nextp = &allnodes->allnext; | |
309 | allnodes->child = prom_build_tree(allnodes, | |
310 | prom_getchild(allnodes->node), | |
311 | &nextp); | |
312 | of_console_init(); | |
313 | ||
314 | printk("PROM: Built device tree with %u bytes of memory.\n", | |
315 | prom_early_allocated); | |
23dc758e | 316 | } |