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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
Andres Salomona74ea432011-02-23 22:38:22 -080039static char * __init of_pdt_build_full_name(struct device_node *dp)
Andres Salomon3cfc5352010-10-10 21:42:33 -060040{
Andres Salomona74ea432011-02-23 22:38:22 -080041 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;
Andres Salomon3cfc5352010-10-10 21:42:33 -060059}
60
Andres Salomona74ea432011-02-23 22:38:22 -080061#else /* CONFIG_SPARC */
Andres Salomon3cfc5352010-10-10 21:42:33 -060062
63static inline void of_pdt_incr_unique_id(void *p) { }
64static inline void irq_trans_init(struct device_node *dp) { }
65
Andres Salomona74ea432011-02-23 22:38:22 -080066static char * __init of_pdt_build_full_name(struct device_node *dp)
Andres Salomon3cfc5352010-10-10 21:42:33 -060067{
Andres Salomona74ea432011-02-23 22:38:22 -080068 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;
Andres Salomon3cfc5352010-10-10 21:42:33 -060088}
89
90#endif /* !CONFIG_SPARC */
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000091
Andres Salomoned418502010-10-10 21:51:25 -060092static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +000093 char *special_name,
94 void *special_val,
95 int special_len)
96{
97 static struct property *tmp = NULL;
98 struct property *p;
Andres Salomonf90c34bd2010-10-10 21:49:45 -060099 int err;
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000100
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);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600107 of_pdt_incr_unique_id(p);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000108 }
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 {
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600117 err = of_pdt_prom_ops->nextprop(node, prev, p->name);
118 if (err) {
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000119 tmp = p;
120 return NULL;
121 }
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600122 p->length = of_pdt_prom_ops->getproplen(node, p->name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000123 if (p->length <= 0) {
124 p->length = 0;
125 } else {
126 int len;
127
128 p->value = prom_early_alloc(p->length + 1);
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600129 len = of_pdt_prom_ops->getproperty(node, p->name,
130 p->value, p->length);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000131 if (len <= 0)
132 p->length = 0;
133 ((unsigned char *)p->value)[p->length] = '\0';
134 }
135 }
136 return p;
137}
138
Andres Salomoned418502010-10-10 21:51:25 -0600139static struct property * __init of_pdt_build_prop_list(phandle node)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000140{
141 struct property *head, *tail;
142
Andres Salomoned418502010-10-10 21:51:25 -0600143 head = tail = of_pdt_build_one_prop(node, NULL,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000144 ".node", &node, sizeof(node));
145
Andres Salomoned418502010-10-10 21:51:25 -0600146 tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000147 tail = tail->next;
148 while(tail) {
Andres Salomoned418502010-10-10 21:51:25 -0600149 tail->next = of_pdt_build_one_prop(node, tail->name,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000150 NULL, NULL, 0);
151 tail = tail->next;
152 }
153
154 return head;
155}
156
Andres Salomoned418502010-10-10 21:51:25 -0600157static char * __init of_pdt_get_one_property(phandle node, const char *name)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000158{
159 char *buf = "<NULL>";
160 int len;
161
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600162 len = of_pdt_prom_ops->getproplen(node, name);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000163 if (len > 0) {
164 buf = prom_early_alloc(len);
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600165 len = of_pdt_prom_ops->getproperty(node, name, buf, len);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000166 }
167
168 return buf;
169}
170
Andres Salomoned418502010-10-10 21:51:25 -0600171static struct device_node * __init of_pdt_create_node(phandle node,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000172 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));
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
183 kref_init(&dp->kref);
184
Andres Salomona74ea432011-02-23 22:38:22 -0800185 dp->name = of_pdt_get_one_property(node, "name");
Andres Salomoned418502010-10-10 21:51:25 -0600186 dp->type = of_pdt_get_one_property(node, "device_type");
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000187 dp->phandle = node;
188
Andres Salomoned418502010-10-10 21:51:25 -0600189 dp->properties = of_pdt_build_prop_list(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000190
191 irq_trans_init(dp);
192
193 return dp;
194}
195
Andres Salomoned418502010-10-10 21:51:25 -0600196static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000197 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) {
Andres Salomoned418502010-10-10 21:51:25 -0600204 dp = of_pdt_create_node(node, parent);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000205 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
Andres Salomoned418502010-10-10 21:51:25 -0600218 dp->full_name = of_pdt_build_full_name(dp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000219
Andres Salomoned418502010-10-10 21:51:25 -0600220 dp->child = of_pdt_build_tree(dp,
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600221 of_pdt_prom_ops->getchild(node), nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000222
Andres Salomoned418502010-10-10 21:51:25 -0600223 if (of_pdt_build_more)
224 of_pdt_build_more(dp, nextp);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000225
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600226 node = of_pdt_prom_ops->getsibling(node);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000227 }
228
229 return ret;
230}
231
Sam Ravnborg75c71842011-12-27 22:58:40 +0100232static void * __init kernel_tree_alloc(u64 size, u64 align)
Shawn Guo611cad72011-08-15 15:28:14 +0800233{
234 return prom_early_alloc(size);
235}
236
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600237void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000238{
239 struct device_node **nextp;
240
Andres Salomonf90c34bd2010-10-10 21:49:45 -0600241 BUG_ON(!ops);
242 of_pdt_prom_ops = ops;
243
Randy Dunlap465aac62012-11-30 10:01:51 +0000244 of_allnodes = of_pdt_create_node(root_node, NULL);
Andres Salomon3cfc5352010-10-10 21:42:33 -0600245#if defined(CONFIG_SPARC)
Randy Dunlap465aac62012-11-30 10:01:51 +0000246 of_allnodes->path_component_name = "";
Andres Salomon3cfc5352010-10-10 21:42:33 -0600247#endif
Randy Dunlap465aac62012-11-30 10:01:51 +0000248 of_allnodes->full_name = "/";
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000249
Randy Dunlap465aac62012-11-30 10:01:51 +0000250 nextp = &of_allnodes->allnext;
251 of_allnodes->child = of_pdt_build_tree(of_allnodes,
252 of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);
Shawn Guo611cad72011-08-15 15:28:14 +0800253
Robert P. J. Day4c7d6362013-05-30 05:38:08 -0400254 /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
Shawn Guo611cad72011-08-15 15:28:14 +0800255 of_alias_scan(kernel_tree_alloc);
Andres Salomon9bdf6ba2010-08-30 03:57:28 +0000256}