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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 | ||
28 | struct device_node *of_find_node_by_phandle(phandle handle) | |
29 | { | |
30 | struct device_node *np; | |
31 | ||
32 | for (np = allnodes; np; np = np->allnext) | |
33 | if (np->node == handle) | |
34 | break; | |
35 | ||
36 | return np; | |
37 | } | |
38 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
39 | ||
40 | int of_getintprop_default(struct device_node *np, const char *name, int def) | |
41 | { | |
42 | struct property *prop; | |
43 | int len; | |
44 | ||
45 | prop = of_find_property(np, name, &len); | |
46 | if (!prop || len != 4) | |
47 | return def; | |
48 | ||
49 | return *(int *) prop->value; | |
50 | } | |
51 | EXPORT_SYMBOL(of_getintprop_default); | |
52 | ||
53 | DEFINE_MUTEX(of_set_property_mutex); | |
54 | EXPORT_SYMBOL(of_set_property_mutex); | |
55 | ||
56 | int of_set_property(struct device_node *dp, const char *name, void *val, int len) | |
57 | { | |
58 | struct property **prevp; | |
59 | void *new_val; | |
60 | int err; | |
61 | ||
62 | new_val = kmalloc(len, GFP_KERNEL); | |
63 | if (!new_val) | |
64 | return -ENOMEM; | |
65 | ||
66 | memcpy(new_val, val, len); | |
67 | ||
68 | err = -ENODEV; | |
69 | ||
70 | write_lock(&devtree_lock); | |
71 | prevp = &dp->properties; | |
72 | while (*prevp) { | |
73 | struct property *prop = *prevp; | |
74 | ||
75 | if (!strcasecmp(prop->name, name)) { | |
76 | void *old_val = prop->value; | |
77 | int ret; | |
78 | ||
79 | mutex_lock(&of_set_property_mutex); | |
80 | ret = prom_setprop(dp->node, name, val, len); | |
81 | mutex_unlock(&of_set_property_mutex); | |
82 | ||
83 | err = -EINVAL; | |
84 | if (ret >= 0) { | |
85 | prop->value = new_val; | |
86 | prop->length = len; | |
87 | ||
88 | if (OF_IS_DYNAMIC(prop)) | |
89 | kfree(old_val); | |
90 | ||
91 | OF_MARK_DYNAMIC(prop); | |
92 | ||
93 | err = 0; | |
94 | } | |
95 | break; | |
96 | } | |
97 | prevp = &(*prevp)->next; | |
98 | } | |
99 | write_unlock(&devtree_lock); | |
100 | ||
101 | /* XXX Upate procfs if necessary... */ | |
102 | ||
103 | return err; | |
104 | } | |
105 | EXPORT_SYMBOL(of_set_property); | |
106 | ||
107 | int of_find_in_proplist(const char *list, const char *match, int len) | |
108 | { | |
109 | while (len > 0) { | |
110 | int l; | |
111 | ||
112 | if (!strcmp(list, match)) | |
113 | return 1; | |
114 | l = strlen(list) + 1; | |
115 | list += l; | |
116 | len -= l; | |
117 | } | |
118 | return 0; | |
119 | } | |
120 | EXPORT_SYMBOL(of_find_in_proplist); | |
121 | ||
e5ff0fe3 | 122 | unsigned int prom_unique_id; |
b9e5567c DM |
123 | |
124 | static struct property * __init build_one_prop(phandle node, char *prev, | |
125 | char *special_name, | |
126 | void *special_val, | |
127 | int special_len) | |
128 | { | |
129 | static struct property *tmp = NULL; | |
130 | struct property *p; | |
131 | const char *name; | |
132 | ||
133 | if (tmp) { | |
134 | p = tmp; | |
135 | memset(p, 0, sizeof(*p) + 32); | |
136 | tmp = NULL; | |
137 | } else { | |
138 | p = prom_early_alloc(sizeof(struct property) + 32); | |
139 | p->unique_id = prom_unique_id++; | |
140 | } | |
141 | ||
142 | p->name = (char *) (p + 1); | |
143 | if (special_name) { | |
144 | strcpy(p->name, special_name); | |
145 | p->length = special_len; | |
146 | p->value = prom_early_alloc(special_len); | |
147 | memcpy(p->value, special_val, special_len); | |
148 | } else { | |
149 | #ifdef CONFIG_SPARC32 | |
150 | if (prev == NULL) { | |
151 | name = prom_firstprop(node, NULL); | |
152 | } else { | |
153 | name = prom_nextprop(node, prev, NULL); | |
154 | } | |
155 | #else | |
156 | if (prev == NULL) { | |
157 | prom_firstprop(node, p->name); | |
158 | } else { | |
159 | prom_nextprop(node, prev, p->name); | |
160 | } | |
161 | name = p->name; | |
162 | #endif | |
163 | if (strlen(name) == 0) { | |
164 | tmp = p; | |
165 | return NULL; | |
166 | } | |
167 | #ifdef CONFIG_SPARC32 | |
168 | strcpy(p->name, name); | |
169 | #endif | |
170 | p->length = prom_getproplen(node, p->name); | |
171 | if (p->length <= 0) { | |
172 | p->length = 0; | |
173 | } else { | |
174 | int len; | |
175 | ||
176 | p->value = prom_early_alloc(p->length + 1); | |
177 | len = prom_getproperty(node, p->name, p->value, | |
178 | p->length); | |
179 | if (len <= 0) | |
180 | p->length = 0; | |
181 | ((unsigned char *)p->value)[p->length] = '\0'; | |
182 | } | |
183 | } | |
184 | return p; | |
185 | } | |
186 | ||
7d9439d5 | 187 | static struct property * __init build_prop_list(phandle node) |
b9e5567c DM |
188 | { |
189 | struct property *head, *tail; | |
190 | ||
191 | head = tail = build_one_prop(node, NULL, | |
192 | ".node", &node, sizeof(node)); | |
193 | ||
194 | tail->next = build_one_prop(node, NULL, NULL, NULL, 0); | |
195 | tail = tail->next; | |
196 | while(tail) { | |
197 | tail->next = build_one_prop(node, tail->name, | |
198 | NULL, NULL, 0); | |
199 | tail = tail->next; | |
200 | } | |
201 | ||
202 | return head; | |
203 | } | |
7d9439d5 DM |
204 | |
205 | static char * __init get_one_property(phandle node, const char *name) | |
206 | { | |
207 | char *buf = "<NULL>"; | |
208 | int len; | |
209 | ||
210 | len = prom_getproplen(node, name); | |
211 | if (len > 0) { | |
212 | buf = prom_early_alloc(len); | |
213 | len = prom_getproperty(node, name, buf, len); | |
214 | } | |
215 | ||
216 | return buf; | |
217 | } | |
218 | ||
219 | struct device_node * __init create_node(phandle node, | |
220 | struct device_node *parent) | |
221 | { | |
222 | struct device_node *dp; | |
223 | ||
224 | if (!node) | |
225 | return NULL; | |
226 | ||
227 | dp = prom_early_alloc(sizeof(*dp)); | |
228 | dp->unique_id = prom_unique_id++; | |
229 | dp->parent = parent; | |
230 | ||
231 | kref_init(&dp->kref); | |
232 | ||
233 | dp->name = get_one_property(node, "name"); | |
234 | dp->type = get_one_property(node, "device_type"); | |
235 | dp->node = node; | |
236 | ||
237 | /* Build interrupts later... */ | |
238 | ||
239 | dp->properties = build_prop_list(node); | |
240 | ||
241 | return dp; | |
242 | } |