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Andres Salomon3cfc5352010-10-10 21:42:33 -06001/* pdt.c: OF PROM device tree support code.
Andres Salomon9bdf6ba2010-08-30 03:57:28 +00002 *
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
Andres Salomon3cfc5352010-10-10 21:42:33 -060010 * Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000011 *
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>
Andres Salomon3cfc5352010-10-10 21:42:33 -060024#include <linux/of_pdt.h>
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000025#include <asm/prom.h>
Andres Salomonf90c34bd2010-10-10 21:49:45 -060026
27static struct of_pdt_ops *of_pdt_prom_ops __initdata;
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000028
Andres Salomoned418502010-10-10 21:51:25 -060029void __initdata (*of_pdt_build_more)(struct device_node *dp,
Andres Salomon3cfc5352010-10-10 21:42:33 -060030 struct device_node ***nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000031
Andres Salomon3cfc5352010-10-10 21:42:33 -060032#if defined(CONFIG_SPARC)
33unsigned 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
39static inline const char *of_pdt_node_name(struct device_node *dp)
40{
41 return dp->path_component_name;
42}
43
44#else
45
46static inline void of_pdt_incr_unique_id(void *p) { }
47static inline void irq_trans_init(struct device_node *dp) { }
48
49static inline const char *of_pdt_node_name(struct device_node *dp)
50{
51 return dp->name;
52}
53
54#endif /* !CONFIG_SPARC */
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000055
Andres Salomoned418502010-10-10 21:51:25 -060056static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000057 char *special_name,
58 void *special_val,
59 int special_len)
60{
61 static struct property *tmp = NULL;
62 struct property *p;
Andres Salomonf90c34bd2010-10-10 21:49:45 -060063 int err;
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000064
65 if (tmp) {
66 p = tmp;
67 memset(p, 0, sizeof(*p) + 32);
68 tmp = NULL;
69 } else {
70 p = prom_early_alloc(sizeof(struct property) + 32);
Andres Salomon3cfc5352010-10-10 21:42:33 -060071 of_pdt_incr_unique_id(p);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000072 }
73
74 p->name = (char *) (p + 1);
75 if (special_name) {
76 strcpy(p->name, special_name);
77 p->length = special_len;
78 p->value = prom_early_alloc(special_len);
79 memcpy(p->value, special_val, special_len);
80 } else {
Andres Salomonf90c34bd2010-10-10 21:49:45 -060081 err = of_pdt_prom_ops->nextprop(node, prev, p->name);
82 if (err) {
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000083 tmp = p;
84 return NULL;
85 }
Andres Salomonf90c34bd2010-10-10 21:49:45 -060086 p->length = of_pdt_prom_ops->getproplen(node, p->name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000087 if (p->length <= 0) {
88 p->length = 0;
89 } else {
90 int len;
91
92 p->value = prom_early_alloc(p->length + 1);
Andres Salomonf90c34bd2010-10-10 21:49:45 -060093 len = of_pdt_prom_ops->getproperty(node, p->name,
94 p->value, p->length);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000095 if (len <= 0)
96 p->length = 0;
97 ((unsigned char *)p->value)[p->length] = '\0';
98 }
99 }
100 return p;
101}
102
Andres Salomoned418502010-10-10 21:51:25 -0600103static struct property * __init of_pdt_build_prop_list(phandle node)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000104{
105 struct property *head, *tail;
106
Andres Salomoned418502010-10-10 21:51:25 -0600107 head = tail = of_pdt_build_one_prop(node, NULL,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000108 ".node", &node, sizeof(node));
109
Andres Salomoned418502010-10-10 21:51:25 -0600110 tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000111 tail = tail->next;
112 while(tail) {
Andres Salomoned418502010-10-10 21:51:25 -0600113 tail->next = of_pdt_build_one_prop(node, tail->name,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000114 NULL, NULL, 0);
115 tail = tail->next;
116 }
117
118 return head;
119}
120
Andres Salomoned418502010-10-10 21:51:25 -0600121static char * __init of_pdt_get_one_property(phandle node, const char *name)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000122{
123 char *buf = "<NULL>";
124 int len;
125
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600126 len = of_pdt_prom_ops->getproplen(node, name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000127 if (len > 0) {
128 buf = prom_early_alloc(len);
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600129 len = of_pdt_prom_ops->getproperty(node, name, buf, len);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000130 }
131
132 return buf;
133}
134
Andres Salomone2f2a932010-10-10 21:52:57 -0600135static char * __init of_pdt_try_pkg2path(phandle node)
136{
137 char *res, *buf = NULL;
138 int len;
139
140 if (!of_pdt_prom_ops->pkg2path)
141 return NULL;
142
143 if (of_pdt_prom_ops->pkg2path(node, buf, 0, &len))
144 return NULL;
145 buf = prom_early_alloc(len + 1);
146 if (of_pdt_prom_ops->pkg2path(node, buf, len, &len)) {
147 pr_err("%s: package-to-path failed\n", __func__);
148 return NULL;
149 }
150
151 res = strrchr(buf, '/');
152 if (!res) {
153 pr_err("%s: couldn't find / in %s\n", __func__, buf);
154 return NULL;
155 }
156 return res+1;
157}
158
159/*
160 * When fetching the node's name, first try using package-to-path; if
161 * that fails (either because the arch hasn't supplied a PROM callback,
162 * or some other random failure), fall back to just looking at the node's
163 * 'name' property.
164 */
165static char * __init of_pdt_build_name(phandle node)
166{
167 char *buf;
168
169 buf = of_pdt_try_pkg2path(node);
170 if (!buf)
171 buf = of_pdt_get_one_property(node, "name");
172
173 return buf;
174}
175
Andres Salomoned418502010-10-10 21:51:25 -0600176static struct device_node * __init of_pdt_create_node(phandle node,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000177 struct device_node *parent)
178{
179 struct device_node *dp;
180
181 if (!node)
182 return NULL;
183
184 dp = prom_early_alloc(sizeof(*dp));
Andres Salomon3cfc5352010-10-10 21:42:33 -0600185 of_pdt_incr_unique_id(dp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000186 dp->parent = parent;
187
188 kref_init(&dp->kref);
189
Andres Salomone2f2a932010-10-10 21:52:57 -0600190 dp->name = of_pdt_build_name(node);
Andres Salomoned418502010-10-10 21:51:25 -0600191 dp->type = of_pdt_get_one_property(node, "device_type");
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000192 dp->phandle = node;
193
Andres Salomoned418502010-10-10 21:51:25 -0600194 dp->properties = of_pdt_build_prop_list(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000195
196 irq_trans_init(dp);
197
198 return dp;
199}
200
Andres Salomoned418502010-10-10 21:51:25 -0600201static char * __init of_pdt_build_full_name(struct device_node *dp)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000202{
203 int len, ourlen, plen;
204 char *n;
205
206 plen = strlen(dp->parent->full_name);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600207 ourlen = strlen(of_pdt_node_name(dp));
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000208 len = ourlen + plen + 2;
209
210 n = prom_early_alloc(len);
211 strcpy(n, dp->parent->full_name);
212 if (!of_node_is_root(dp->parent)) {
213 strcpy(n + plen, "/");
214 plen++;
215 }
Andres Salomon3cfc5352010-10-10 21:42:33 -0600216 strcpy(n + plen, of_pdt_node_name(dp));
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000217
218 return n;
219}
220
Andres Salomoned418502010-10-10 21:51:25 -0600221static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000222 phandle node,
223 struct device_node ***nextp)
224{
225 struct device_node *ret = NULL, *prev_sibling = NULL;
226 struct device_node *dp;
227
228 while (1) {
Andres Salomoned418502010-10-10 21:51:25 -0600229 dp = of_pdt_create_node(node, parent);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000230 if (!dp)
231 break;
232
233 if (prev_sibling)
234 prev_sibling->sibling = dp;
235
236 if (!ret)
237 ret = dp;
238 prev_sibling = dp;
239
240 *(*nextp) = dp;
241 *nextp = &dp->allnext;
242
Andres Salomon3cfc5352010-10-10 21:42:33 -0600243#if defined(CONFIG_SPARC)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000244 dp->path_component_name = build_path_component(dp);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600245#endif
Andres Salomoned418502010-10-10 21:51:25 -0600246 dp->full_name = of_pdt_build_full_name(dp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000247
Andres Salomoned418502010-10-10 21:51:25 -0600248 dp->child = of_pdt_build_tree(dp,
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600249 of_pdt_prom_ops->getchild(node), nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000250
Andres Salomoned418502010-10-10 21:51:25 -0600251 if (of_pdt_build_more)
252 of_pdt_build_more(dp, nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000253
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600254 node = of_pdt_prom_ops->getsibling(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000255 }
256
257 return ret;
258}
259
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600260void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000261{
262 struct device_node **nextp;
263
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600264 BUG_ON(!ops);
265 of_pdt_prom_ops = ops;
266
Andres Salomoned418502010-10-10 21:51:25 -0600267 allnodes = of_pdt_create_node(root_node, NULL);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600268#if defined(CONFIG_SPARC)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000269 allnodes->path_component_name = "";
Andres Salomon3cfc5352010-10-10 21:42:33 -0600270#endif
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000271 allnodes->full_name = "/";
272
273 nextp = &allnodes->allnext;
Andres Salomoned418502010-10-10 21:51:25 -0600274 allnodes->child = of_pdt_build_tree(allnodes,
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600275 of_pdt_prom_ops->getchild(allnodes->phandle), &nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000276}