Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux-2.6
[linux-3.10.git] / drivers / of / pdt.c
1 /* pdt.c: OF PROM device tree support 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  *  Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
11  *
12  *      This program is free software; you can redistribute it and/or
13  *      modify it under the terms of the GNU General Public License
14  *      as published by the Free Software Foundation; either version
15  *      2 of the License, or (at your option) any later version.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/errno.h>
21 #include <linux/mutex.h>
22 #include <linux/slab.h>
23 #include <linux/of.h>
24 #include <linux/of_pdt.h>
25 #include <asm/prom.h>
26
27 static struct of_pdt_ops *of_pdt_prom_ops __initdata;
28
29 void __initdata (*of_pdt_build_more)(struct device_node *dp,
30                 struct device_node ***nextp);
31
32 #if defined(CONFIG_SPARC)
33 unsigned int of_pdt_unique_id __initdata;
34
35 #define of_pdt_incr_unique_id(p) do { \
36         (p)->unique_id = of_pdt_unique_id++; \
37 } while (0)
38
39 static char * __init of_pdt_build_full_name(struct device_node *dp)
40 {
41         int len, ourlen, plen;
42         char *n;
43
44         dp->path_component_name = build_path_component(dp);
45
46         plen = strlen(dp->parent->full_name);
47         ourlen = strlen(dp->path_component_name);
48         len = ourlen + plen + 2;
49
50         n = prom_early_alloc(len);
51         strcpy(n, dp->parent->full_name);
52         if (!of_node_is_root(dp->parent)) {
53                 strcpy(n + plen, "/");
54                 plen++;
55         }
56         strcpy(n + plen, dp->path_component_name);
57
58         return n;
59 }
60
61 #else /* CONFIG_SPARC */
62
63 static inline void of_pdt_incr_unique_id(void *p) { }
64 static inline void irq_trans_init(struct device_node *dp) { }
65
66 static char * __init of_pdt_build_full_name(struct device_node *dp)
67 {
68         static int failsafe_id = 0; /* for generating unique names on failure */
69         char *buf;
70         int len;
71
72         if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
73                 goto failsafe;
74
75         buf = prom_early_alloc(len + 1);
76         if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
77                 goto failsafe;
78         return buf;
79
80  failsafe:
81         buf = prom_early_alloc(strlen(dp->parent->full_name) +
82                                strlen(dp->name) + 16);
83         sprintf(buf, "%s/%s@unknown%i",
84                 of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
85                 dp->name, failsafe_id++);
86         pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
87         return buf;
88 }
89
90 #endif /* !CONFIG_SPARC */
91
92 static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
93                                                char *special_name,
94                                                void *special_val,
95                                                int special_len)
96 {
97         static struct property *tmp = NULL;
98         struct property *p;
99         int err;
100
101         if (tmp) {
102                 p = tmp;
103                 memset(p, 0, sizeof(*p) + 32);
104                 tmp = NULL;
105         } else {
106                 p = prom_early_alloc(sizeof(struct property) + 32);
107                 of_pdt_incr_unique_id(p);
108         }
109
110         p->name = (char *) (p + 1);
111         if (special_name) {
112                 strcpy(p->name, special_name);
113                 p->length = special_len;
114                 p->value = prom_early_alloc(special_len);
115                 memcpy(p->value, special_val, special_len);
116         } else {
117                 err = of_pdt_prom_ops->nextprop(node, prev, p->name);
118                 if (err) {
119                         tmp = p;
120                         return NULL;
121                 }
122                 p->length = of_pdt_prom_ops->getproplen(node, p->name);
123                 if (p->length <= 0) {
124                         p->length = 0;
125                 } else {
126                         int len;
127
128                         p->value = prom_early_alloc(p->length + 1);
129                         len = of_pdt_prom_ops->getproperty(node, p->name,
130                                         p->value, p->length);
131                         if (len <= 0)
132                                 p->length = 0;
133                         ((unsigned char *)p->value)[p->length] = '\0';
134                 }
135         }
136         return p;
137 }
138
139 static struct property * __init of_pdt_build_prop_list(phandle node)
140 {
141         struct property *head, *tail;
142
143         head = tail = of_pdt_build_one_prop(node, NULL,
144                                      ".node", &node, sizeof(node));
145
146         tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
147         tail = tail->next;
148         while(tail) {
149                 tail->next = of_pdt_build_one_prop(node, tail->name,
150                                             NULL, NULL, 0);
151                 tail = tail->next;
152         }
153
154         return head;
155 }
156
157 static char * __init of_pdt_get_one_property(phandle node, const char *name)
158 {
159         char *buf = "<NULL>";
160         int len;
161
162         len = of_pdt_prom_ops->getproplen(node, name);
163         if (len > 0) {
164                 buf = prom_early_alloc(len);
165                 len = of_pdt_prom_ops->getproperty(node, name, buf, len);
166         }
167
168         return buf;
169 }
170
171 static struct device_node * __init of_pdt_create_node(phandle node,
172                                                     struct device_node *parent)
173 {
174         struct device_node *dp;
175
176         if (!node)
177                 return NULL;
178
179         dp = prom_early_alloc(sizeof(*dp));
180         of_pdt_incr_unique_id(dp);
181         dp->parent = parent;
182
183         kref_init(&dp->kref);
184
185         dp->name = of_pdt_get_one_property(node, "name");
186         dp->type = of_pdt_get_one_property(node, "device_type");
187         dp->phandle = node;
188
189         dp->properties = of_pdt_build_prop_list(node);
190
191         irq_trans_init(dp);
192
193         return dp;
194 }
195
196 static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
197                                                    phandle node,
198                                                    struct device_node ***nextp)
199 {
200         struct device_node *ret = NULL, *prev_sibling = NULL;
201         struct device_node *dp;
202
203         while (1) {
204                 dp = of_pdt_create_node(node, parent);
205                 if (!dp)
206                         break;
207
208                 if (prev_sibling)
209                         prev_sibling->sibling = dp;
210
211                 if (!ret)
212                         ret = dp;
213                 prev_sibling = dp;
214
215                 *(*nextp) = dp;
216                 *nextp = &dp->allnext;
217
218                 dp->full_name = of_pdt_build_full_name(dp);
219
220                 dp->child = of_pdt_build_tree(dp,
221                                 of_pdt_prom_ops->getchild(node), nextp);
222
223                 if (of_pdt_build_more)
224                         of_pdt_build_more(dp, nextp);
225
226                 node = of_pdt_prom_ops->getsibling(node);
227         }
228
229         return ret;
230 }
231
232 static void * __init kernel_tree_alloc(u64 size, u64 align)
233 {
234         return prom_early_alloc(size);
235 }
236
237 void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
238 {
239         struct device_node **nextp;
240
241         BUG_ON(!ops);
242         of_pdt_prom_ops = ops;
243
244         of_allnodes = of_pdt_create_node(root_node, NULL);
245 #if defined(CONFIG_SPARC)
246         of_allnodes->path_component_name = "";
247 #endif
248         of_allnodes->full_name = "/";
249
250         nextp = &of_allnodes->allnext;
251         of_allnodes->child = of_pdt_build_tree(of_allnodes,
252                         of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);
253
254         /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
255         of_alias_scan(kernel_tree_alloc);
256 }