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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 Salomonf90c34bd2010-10-10 21:49:45 -060025
26static struct of_pdt_ops *of_pdt_prom_ops __initdata;
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000027
Andres Salomoned418502010-10-10 21:51:25 -060028void __initdata (*of_pdt_build_more)(struct device_node *dp,
Andres Salomon3cfc5352010-10-10 21:42:33 -060029 struct device_node ***nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000030
Andres Salomon3cfc5352010-10-10 21:42:33 -060031#if defined(CONFIG_SPARC)
32unsigned int of_pdt_unique_id __initdata;
33
34#define of_pdt_incr_unique_id(p) do { \
35 (p)->unique_id = of_pdt_unique_id++; \
36} while (0)
37
Andres Salomona74ea432011-02-23 22:38:22 -080038static char * __init of_pdt_build_full_name(struct device_node *dp)
Andres Salomon3cfc5352010-10-10 21:42:33 -060039{
Andres Salomona74ea432011-02-23 22:38:22 -080040 int len, ourlen, plen;
41 char *n;
42
43 dp->path_component_name = build_path_component(dp);
44
45 plen = strlen(dp->parent->full_name);
46 ourlen = strlen(dp->path_component_name);
47 len = ourlen + plen + 2;
48
49 n = prom_early_alloc(len);
50 strcpy(n, dp->parent->full_name);
51 if (!of_node_is_root(dp->parent)) {
52 strcpy(n + plen, "/");
53 plen++;
54 }
55 strcpy(n + plen, dp->path_component_name);
56
57 return n;
Andres Salomon3cfc5352010-10-10 21:42:33 -060058}
59
Andres Salomona74ea432011-02-23 22:38:22 -080060#else /* CONFIG_SPARC */
Andres Salomon3cfc5352010-10-10 21:42:33 -060061
62static inline void of_pdt_incr_unique_id(void *p) { }
63static inline void irq_trans_init(struct device_node *dp) { }
64
Andres Salomona74ea432011-02-23 22:38:22 -080065static char * __init of_pdt_build_full_name(struct device_node *dp)
Andres Salomon3cfc5352010-10-10 21:42:33 -060066{
Andres Salomona74ea432011-02-23 22:38:22 -080067 static int failsafe_id = 0; /* for generating unique names on failure */
68 char *buf;
69 int len;
70
71 if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
72 goto failsafe;
73
74 buf = prom_early_alloc(len + 1);
75 if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
76 goto failsafe;
77 return buf;
78
79 failsafe:
80 buf = prom_early_alloc(strlen(dp->parent->full_name) +
81 strlen(dp->name) + 16);
82 sprintf(buf, "%s/%s@unknown%i",
83 of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
84 dp->name, failsafe_id++);
85 pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
86 return buf;
Andres Salomon3cfc5352010-10-10 21:42:33 -060087}
88
89#endif /* !CONFIG_SPARC */
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000090
Andres Salomoned418502010-10-10 21:51:25 -060091static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000092 char *special_name,
93 void *special_val,
94 int special_len)
95{
96 static struct property *tmp = NULL;
97 struct property *p;
Andres Salomonf90c34bd2010-10-10 21:49:45 -060098 int err;
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000099
100 if (tmp) {
101 p = tmp;
102 memset(p, 0, sizeof(*p) + 32);
103 tmp = NULL;
104 } else {
105 p = prom_early_alloc(sizeof(struct property) + 32);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600106 of_pdt_incr_unique_id(p);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000107 }
108
109 p->name = (char *) (p + 1);
110 if (special_name) {
111 strcpy(p->name, special_name);
112 p->length = special_len;
113 p->value = prom_early_alloc(special_len);
114 memcpy(p->value, special_val, special_len);
115 } else {
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600116 err = of_pdt_prom_ops->nextprop(node, prev, p->name);
117 if (err) {
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000118 tmp = p;
119 return NULL;
120 }
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600121 p->length = of_pdt_prom_ops->getproplen(node, p->name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000122 if (p->length <= 0) {
123 p->length = 0;
124 } else {
125 int len;
126
127 p->value = prom_early_alloc(p->length + 1);
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600128 len = of_pdt_prom_ops->getproperty(node, p->name,
129 p->value, p->length);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000130 if (len <= 0)
131 p->length = 0;
132 ((unsigned char *)p->value)[p->length] = '\0';
133 }
134 }
135 return p;
136}
137
Andres Salomoned418502010-10-10 21:51:25 -0600138static struct property * __init of_pdt_build_prop_list(phandle node)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000139{
140 struct property *head, *tail;
141
Andres Salomoned418502010-10-10 21:51:25 -0600142 head = tail = of_pdt_build_one_prop(node, NULL,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000143 ".node", &node, sizeof(node));
144
Andres Salomoned418502010-10-10 21:51:25 -0600145 tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000146 tail = tail->next;
147 while(tail) {
Andres Salomoned418502010-10-10 21:51:25 -0600148 tail->next = of_pdt_build_one_prop(node, tail->name,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000149 NULL, NULL, 0);
150 tail = tail->next;
151 }
152
153 return head;
154}
155
Andres Salomoned418502010-10-10 21:51:25 -0600156static char * __init of_pdt_get_one_property(phandle node, const char *name)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000157{
158 char *buf = "<NULL>";
159 int len;
160
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600161 len = of_pdt_prom_ops->getproplen(node, name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000162 if (len > 0) {
163 buf = prom_early_alloc(len);
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600164 len = of_pdt_prom_ops->getproperty(node, name, buf, len);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000165 }
166
167 return buf;
168}
169
Andres Salomoned418502010-10-10 21:51:25 -0600170static struct device_node * __init of_pdt_create_node(phandle node,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000171 struct device_node *parent)
172{
173 struct device_node *dp;
174
175 if (!node)
176 return NULL;
177
178 dp = prom_early_alloc(sizeof(*dp));
Pantelis Antoniou0829f6d2013-12-13 20:08:59 +0200179 of_node_init(dp);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600180 of_pdt_incr_unique_id(dp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000181 dp->parent = parent;
182
Andres Salomona74ea432011-02-23 22:38:22 -0800183 dp->name = of_pdt_get_one_property(node, "name");
Andres Salomoned418502010-10-10 21:51:25 -0600184 dp->type = of_pdt_get_one_property(node, "device_type");
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000185 dp->phandle = node;
186
Andres Salomoned418502010-10-10 21:51:25 -0600187 dp->properties = of_pdt_build_prop_list(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000188
189 irq_trans_init(dp);
190
191 return dp;
192}
193
Andres Salomoned418502010-10-10 21:51:25 -0600194static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000195 phandle node,
196 struct device_node ***nextp)
197{
198 struct device_node *ret = NULL, *prev_sibling = NULL;
199 struct device_node *dp;
200
201 while (1) {
Andres Salomoned418502010-10-10 21:51:25 -0600202 dp = of_pdt_create_node(node, parent);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000203 if (!dp)
204 break;
205
206 if (prev_sibling)
207 prev_sibling->sibling = dp;
208
209 if (!ret)
210 ret = dp;
211 prev_sibling = dp;
212
213 *(*nextp) = dp;
214 *nextp = &dp->allnext;
215
Andres Salomoned418502010-10-10 21:51:25 -0600216 dp->full_name = of_pdt_build_full_name(dp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000217
Andres Salomoned418502010-10-10 21:51:25 -0600218 dp->child = of_pdt_build_tree(dp,
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600219 of_pdt_prom_ops->getchild(node), nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000220
Andres Salomoned418502010-10-10 21:51:25 -0600221 if (of_pdt_build_more)
222 of_pdt_build_more(dp, nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000223
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600224 node = of_pdt_prom_ops->getsibling(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000225 }
226
227 return ret;
228}
229
Sam Ravnborg75c71842011-12-27 22:58:40 +0100230static void * __init kernel_tree_alloc(u64 size, u64 align)
Shawn Guo611cad72011-08-15 15:28:14 +0800231{
232 return prom_early_alloc(size);
233}
234
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600235void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000236{
237 struct device_node **nextp;
238
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600239 BUG_ON(!ops);
240 of_pdt_prom_ops = ops;
241
Randy Dunlap465aac62012-11-30 10:01:51 +0000242 of_allnodes = of_pdt_create_node(root_node, NULL);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600243#if defined(CONFIG_SPARC)
Randy Dunlap465aac62012-11-30 10:01:51 +0000244 of_allnodes->path_component_name = "";
Andres Salomon3cfc5352010-10-10 21:42:33 -0600245#endif
Randy Dunlap465aac62012-11-30 10:01:51 +0000246 of_allnodes->full_name = "/";
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000247
Randy Dunlap465aac62012-11-30 10:01:51 +0000248 nextp = &of_allnodes->allnext;
249 of_allnodes->child = of_pdt_build_tree(of_allnodes,
250 of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);
Shawn Guo611cad72011-08-15 15:28:14 +0800251
Robert P. J. Day4c7d6362013-05-30 05:38:08 -0400252 /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
Shawn Guo611cad72011-08-15 15:28:14 +0800253 of_alias_scan(kernel_tree_alloc);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000254}