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Commit | Line | Data |
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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> |
f90c34bd AS |
25 | |
26 | static struct of_pdt_ops *of_pdt_prom_ops __initdata; | |
9bdf6bab | 27 | |
ed418502 | 28 | void __initdata (*of_pdt_build_more)(struct device_node *dp, |
3cfc535c | 29 | struct device_node ***nextp); |
9bdf6bab | 30 | |
3cfc535c AS |
31 | #if defined(CONFIG_SPARC) |
32 | unsigned 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 | ||
a74ea43d | 38 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 39 | { |
a74ea43d AS |
40 | 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; | |
3cfc535c AS |
58 | } |
59 | ||
a74ea43d | 60 | #else /* CONFIG_SPARC */ |
3cfc535c AS |
61 | |
62 | static inline void of_pdt_incr_unique_id(void *p) { } | |
63 | static inline void irq_trans_init(struct device_node *dp) { } | |
64 | ||
a74ea43d | 65 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 66 | { |
a74ea43d AS |
67 | 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; | |
3cfc535c AS |
87 | } |
88 | ||
89 | #endif /* !CONFIG_SPARC */ | |
9bdf6bab | 90 | |
ed418502 | 91 | static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, |
9bdf6bab AS |
92 | char *special_name, |
93 | void *special_val, | |
94 | int special_len) | |
95 | { | |
96 | static struct property *tmp = NULL; | |
97 | struct property *p; | |
f90c34bd | 98 | int err; |
9bdf6bab AS |
99 | |
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); | |
3cfc535c | 106 | of_pdt_incr_unique_id(p); |
9bdf6bab AS |
107 | } |
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 { | |
f90c34bd AS |
116 | err = of_pdt_prom_ops->nextprop(node, prev, p->name); |
117 | if (err) { | |
9bdf6bab AS |
118 | tmp = p; |
119 | return NULL; | |
120 | } | |
f90c34bd | 121 | p->length = of_pdt_prom_ops->getproplen(node, p->name); |
9bdf6bab AS |
122 | if (p->length <= 0) { |
123 | p->length = 0; | |
124 | } else { | |
125 | int len; | |
126 | ||
127 | p->value = prom_early_alloc(p->length + 1); | |
f90c34bd AS |
128 | len = of_pdt_prom_ops->getproperty(node, p->name, |
129 | p->value, p->length); | |
9bdf6bab AS |
130 | if (len <= 0) |
131 | p->length = 0; | |
132 | ((unsigned char *)p->value)[p->length] = '\0'; | |
133 | } | |
134 | } | |
135 | return p; | |
136 | } | |
137 | ||
ed418502 | 138 | static struct property * __init of_pdt_build_prop_list(phandle node) |
9bdf6bab AS |
139 | { |
140 | struct property *head, *tail; | |
141 | ||
ed418502 | 142 | head = tail = of_pdt_build_one_prop(node, NULL, |
9bdf6bab AS |
143 | ".node", &node, sizeof(node)); |
144 | ||
ed418502 | 145 | tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); |
9bdf6bab AS |
146 | tail = tail->next; |
147 | while(tail) { | |
ed418502 | 148 | tail->next = of_pdt_build_one_prop(node, tail->name, |
9bdf6bab AS |
149 | NULL, NULL, 0); |
150 | tail = tail->next; | |
151 | } | |
152 | ||
153 | return head; | |
154 | } | |
155 | ||
ed418502 | 156 | static char * __init of_pdt_get_one_property(phandle node, const char *name) |
9bdf6bab AS |
157 | { |
158 | char *buf = "<NULL>"; | |
159 | int len; | |
160 | ||
f90c34bd | 161 | len = of_pdt_prom_ops->getproplen(node, name); |
9bdf6bab AS |
162 | if (len > 0) { |
163 | buf = prom_early_alloc(len); | |
f90c34bd | 164 | len = of_pdt_prom_ops->getproperty(node, name, buf, len); |
9bdf6bab AS |
165 | } |
166 | ||
167 | return buf; | |
168 | } | |
169 | ||
ed418502 | 170 | static struct device_node * __init of_pdt_create_node(phandle node, |
9bdf6bab AS |
171 | 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)); | |
3cfc535c | 179 | of_pdt_incr_unique_id(dp); |
9bdf6bab AS |
180 | dp->parent = parent; |
181 | ||
182 | kref_init(&dp->kref); | |
183 | ||
a74ea43d | 184 | dp->name = of_pdt_get_one_property(node, "name"); |
ed418502 | 185 | dp->type = of_pdt_get_one_property(node, "device_type"); |
9bdf6bab AS |
186 | dp->phandle = node; |
187 | ||
ed418502 | 188 | dp->properties = of_pdt_build_prop_list(node); |
9bdf6bab AS |
189 | |
190 | irq_trans_init(dp); | |
191 | ||
192 | return dp; | |
193 | } | |
194 | ||
ed418502 | 195 | static struct device_node * __init of_pdt_build_tree(struct device_node *parent, |
9bdf6bab AS |
196 | phandle node, |
197 | struct device_node ***nextp) | |
198 | { | |
199 | struct device_node *ret = NULL, *prev_sibling = NULL; | |
200 | struct device_node *dp; | |
201 | ||
202 | while (1) { | |
ed418502 | 203 | dp = of_pdt_create_node(node, parent); |
9bdf6bab AS |
204 | if (!dp) |
205 | break; | |
206 | ||
207 | if (prev_sibling) | |
208 | prev_sibling->sibling = dp; | |
209 | ||
210 | if (!ret) | |
211 | ret = dp; | |
212 | prev_sibling = dp; | |
213 | ||
214 | *(*nextp) = dp; | |
215 | *nextp = &dp->allnext; | |
216 | ||
ed418502 | 217 | dp->full_name = of_pdt_build_full_name(dp); |
9bdf6bab | 218 | |
ed418502 | 219 | dp->child = of_pdt_build_tree(dp, |
f90c34bd | 220 | of_pdt_prom_ops->getchild(node), nextp); |
9bdf6bab | 221 | |
ed418502 AS |
222 | if (of_pdt_build_more) |
223 | of_pdt_build_more(dp, nextp); | |
9bdf6bab | 224 | |
f90c34bd | 225 | node = of_pdt_prom_ops->getsibling(node); |
9bdf6bab AS |
226 | } |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
75c71848 | 231 | static void * __init kernel_tree_alloc(u64 size, u64 align) |
611cad72 SG |
232 | { |
233 | return prom_early_alloc(size); | |
234 | } | |
235 | ||
f90c34bd | 236 | void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) |
9bdf6bab AS |
237 | { |
238 | struct device_node **nextp; | |
239 | ||
f90c34bd AS |
240 | BUG_ON(!ops); |
241 | of_pdt_prom_ops = ops; | |
242 | ||
465aac6d | 243 | of_allnodes = of_pdt_create_node(root_node, NULL); |
3cfc535c | 244 | #if defined(CONFIG_SPARC) |
465aac6d | 245 | of_allnodes->path_component_name = ""; |
3cfc535c | 246 | #endif |
465aac6d | 247 | of_allnodes->full_name = "/"; |
9bdf6bab | 248 | |
465aac6d RD |
249 | nextp = &of_allnodes->allnext; |
250 | of_allnodes->child = of_pdt_build_tree(of_allnodes, | |
251 | of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp); | |
611cad72 | 252 | |
4c7d6361 | 253 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 254 | of_alias_scan(kernel_tree_alloc); |
9bdf6bab | 255 | } |