Commit | Line | Data |
---|---|---|
3cfc535c | 1 | /* pdt.c: OF PROM device tree support code. |
9bdf6bab AS |
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 | |
3cfc535c | 10 | * Adapted for multiple architectures by Andres Salomon <dilinger@queued.net> |
9bdf6bab AS |
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> | |
3cfc535c | 24 | #include <linux/of_pdt.h> |
9bdf6bab | 25 | #include <asm/prom.h> |
f90c34bd AS |
26 | |
27 | static struct of_pdt_ops *of_pdt_prom_ops __initdata; | |
9bdf6bab | 28 | |
ed418502 | 29 | void __initdata (*of_pdt_build_more)(struct device_node *dp, |
3cfc535c | 30 | struct device_node ***nextp); |
9bdf6bab | 31 | |
3cfc535c AS |
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 | ||
a74ea43d | 39 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 40 | { |
a74ea43d AS |
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; | |
3cfc535c AS |
59 | } |
60 | ||
a74ea43d | 61 | #else /* CONFIG_SPARC */ |
3cfc535c AS |
62 | |
63 | static inline void of_pdt_incr_unique_id(void *p) { } | |
64 | static inline void irq_trans_init(struct device_node *dp) { } | |
65 | ||
a74ea43d | 66 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 67 | { |
a74ea43d AS |
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; | |
3cfc535c AS |
88 | } |
89 | ||
90 | #endif /* !CONFIG_SPARC */ | |
9bdf6bab | 91 | |
ed418502 | 92 | static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, |
9bdf6bab AS |
93 | char *special_name, |
94 | void *special_val, | |
95 | int special_len) | |
96 | { | |
97 | static struct property *tmp = NULL; | |
98 | struct property *p; | |
f90c34bd | 99 | int err; |
9bdf6bab AS |
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); | |
3cfc535c | 107 | of_pdt_incr_unique_id(p); |
9bdf6bab AS |
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 { | |
f90c34bd AS |
117 | err = of_pdt_prom_ops->nextprop(node, prev, p->name); |
118 | if (err) { | |
9bdf6bab AS |
119 | tmp = p; |
120 | return NULL; | |
121 | } | |
f90c34bd | 122 | p->length = of_pdt_prom_ops->getproplen(node, p->name); |
9bdf6bab AS |
123 | if (p->length <= 0) { |
124 | p->length = 0; | |
125 | } else { | |
126 | int len; | |
127 | ||
128 | p->value = prom_early_alloc(p->length + 1); | |
f90c34bd AS |
129 | len = of_pdt_prom_ops->getproperty(node, p->name, |
130 | p->value, p->length); | |
9bdf6bab AS |
131 | if (len <= 0) |
132 | p->length = 0; | |
133 | ((unsigned char *)p->value)[p->length] = '\0'; | |
134 | } | |
135 | } | |
136 | return p; | |
137 | } | |
138 | ||
ed418502 | 139 | static struct property * __init of_pdt_build_prop_list(phandle node) |
9bdf6bab AS |
140 | { |
141 | struct property *head, *tail; | |
142 | ||
ed418502 | 143 | head = tail = of_pdt_build_one_prop(node, NULL, |
9bdf6bab AS |
144 | ".node", &node, sizeof(node)); |
145 | ||
ed418502 | 146 | tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); |
9bdf6bab AS |
147 | tail = tail->next; |
148 | while(tail) { | |
ed418502 | 149 | tail->next = of_pdt_build_one_prop(node, tail->name, |
9bdf6bab AS |
150 | NULL, NULL, 0); |
151 | tail = tail->next; | |
152 | } | |
153 | ||
154 | return head; | |
155 | } | |
156 | ||
ed418502 | 157 | static char * __init of_pdt_get_one_property(phandle node, const char *name) |
9bdf6bab AS |
158 | { |
159 | char *buf = "<NULL>"; | |
160 | int len; | |
161 | ||
f90c34bd | 162 | len = of_pdt_prom_ops->getproplen(node, name); |
9bdf6bab AS |
163 | if (len > 0) { |
164 | buf = prom_early_alloc(len); | |
f90c34bd | 165 | len = of_pdt_prom_ops->getproperty(node, name, buf, len); |
9bdf6bab AS |
166 | } |
167 | ||
168 | return buf; | |
169 | } | |
170 | ||
ed418502 | 171 | static struct device_node * __init of_pdt_create_node(phandle node, |
9bdf6bab AS |
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)); | |
3cfc535c | 180 | of_pdt_incr_unique_id(dp); |
9bdf6bab AS |
181 | dp->parent = parent; |
182 | ||
183 | kref_init(&dp->kref); | |
184 | ||
a74ea43d | 185 | dp->name = of_pdt_get_one_property(node, "name"); |
ed418502 | 186 | dp->type = of_pdt_get_one_property(node, "device_type"); |
9bdf6bab AS |
187 | dp->phandle = node; |
188 | ||
ed418502 | 189 | dp->properties = of_pdt_build_prop_list(node); |
9bdf6bab AS |
190 | |
191 | irq_trans_init(dp); | |
192 | ||
193 | return dp; | |
194 | } | |
195 | ||
ed418502 | 196 | static struct device_node * __init of_pdt_build_tree(struct device_node *parent, |
9bdf6bab AS |
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) { | |
ed418502 | 204 | dp = of_pdt_create_node(node, parent); |
9bdf6bab AS |
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 | ||
ed418502 | 218 | dp->full_name = of_pdt_build_full_name(dp); |
9bdf6bab | 219 | |
ed418502 | 220 | dp->child = of_pdt_build_tree(dp, |
f90c34bd | 221 | of_pdt_prom_ops->getchild(node), nextp); |
9bdf6bab | 222 | |
ed418502 AS |
223 | if (of_pdt_build_more) |
224 | of_pdt_build_more(dp, nextp); | |
9bdf6bab | 225 | |
f90c34bd | 226 | node = of_pdt_prom_ops->getsibling(node); |
9bdf6bab AS |
227 | } |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
f90c34bd | 232 | void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) |
9bdf6bab AS |
233 | { |
234 | struct device_node **nextp; | |
235 | ||
f90c34bd AS |
236 | BUG_ON(!ops); |
237 | of_pdt_prom_ops = ops; | |
238 | ||
ed418502 | 239 | allnodes = of_pdt_create_node(root_node, NULL); |
3cfc535c | 240 | #if defined(CONFIG_SPARC) |
9bdf6bab | 241 | allnodes->path_component_name = ""; |
3cfc535c | 242 | #endif |
9bdf6bab AS |
243 | allnodes->full_name = "/"; |
244 | ||
245 | nextp = &allnodes->allnext; | |
ed418502 | 246 | allnodes->child = of_pdt_build_tree(allnodes, |
f90c34bd | 247 | of_pdt_prom_ops->getchild(allnodes->phandle), &nextp); |
9bdf6bab | 248 | } |