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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> |
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 | ||
39 | static inline const char *of_pdt_node_name(struct device_node *dp) | |
40 | { | |
41 | return dp->path_component_name; | |
42 | } | |
43 | ||
44 | #else | |
45 | ||
46 | static inline void of_pdt_incr_unique_id(void *p) { } | |
47 | static inline void irq_trans_init(struct device_node *dp) { } | |
48 | ||
49 | static inline const char *of_pdt_node_name(struct device_node *dp) | |
50 | { | |
51 | return dp->name; | |
52 | } | |
53 | ||
54 | #endif /* !CONFIG_SPARC */ | |
9bdf6bab | 55 | |
ed418502 | 56 | static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, |
9bdf6bab AS |
57 | char *special_name, |
58 | void *special_val, | |
59 | int special_len) | |
60 | { | |
61 | static struct property *tmp = NULL; | |
62 | struct property *p; | |
f90c34bd | 63 | int err; |
9bdf6bab AS |
64 | |
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); | |
3cfc535c | 71 | of_pdt_incr_unique_id(p); |
9bdf6bab AS |
72 | } |
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 { | |
f90c34bd AS |
81 | err = of_pdt_prom_ops->nextprop(node, prev, p->name); |
82 | if (err) { | |
9bdf6bab AS |
83 | tmp = p; |
84 | return NULL; | |
85 | } | |
f90c34bd | 86 | p->length = of_pdt_prom_ops->getproplen(node, p->name); |
9bdf6bab AS |
87 | if (p->length <= 0) { |
88 | p->length = 0; | |
89 | } else { | |
90 | int len; | |
91 | ||
92 | p->value = prom_early_alloc(p->length + 1); | |
f90c34bd AS |
93 | len = of_pdt_prom_ops->getproperty(node, p->name, |
94 | p->value, p->length); | |
9bdf6bab AS |
95 | if (len <= 0) |
96 | p->length = 0; | |
97 | ((unsigned char *)p->value)[p->length] = '\0'; | |
98 | } | |
99 | } | |
100 | return p; | |
101 | } | |
102 | ||
ed418502 | 103 | static struct property * __init of_pdt_build_prop_list(phandle node) |
9bdf6bab AS |
104 | { |
105 | struct property *head, *tail; | |
106 | ||
ed418502 | 107 | head = tail = of_pdt_build_one_prop(node, NULL, |
9bdf6bab AS |
108 | ".node", &node, sizeof(node)); |
109 | ||
ed418502 | 110 | tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); |
9bdf6bab AS |
111 | tail = tail->next; |
112 | while(tail) { | |
ed418502 | 113 | tail->next = of_pdt_build_one_prop(node, tail->name, |
9bdf6bab AS |
114 | NULL, NULL, 0); |
115 | tail = tail->next; | |
116 | } | |
117 | ||
118 | return head; | |
119 | } | |
120 | ||
ed418502 | 121 | static char * __init of_pdt_get_one_property(phandle node, const char *name) |
9bdf6bab AS |
122 | { |
123 | char *buf = "<NULL>"; | |
124 | int len; | |
125 | ||
f90c34bd | 126 | len = of_pdt_prom_ops->getproplen(node, name); |
9bdf6bab AS |
127 | if (len > 0) { |
128 | buf = prom_early_alloc(len); | |
f90c34bd | 129 | len = of_pdt_prom_ops->getproperty(node, name, buf, len); |
9bdf6bab AS |
130 | } |
131 | ||
132 | return buf; | |
133 | } | |
134 | ||
e2f2a93b AS |
135 | static 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 | */ | |
165 | static 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 | ||
ed418502 | 176 | static struct device_node * __init of_pdt_create_node(phandle node, |
9bdf6bab AS |
177 | 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)); | |
3cfc535c | 185 | of_pdt_incr_unique_id(dp); |
9bdf6bab AS |
186 | dp->parent = parent; |
187 | ||
188 | kref_init(&dp->kref); | |
189 | ||
e2f2a93b | 190 | dp->name = of_pdt_build_name(node); |
ed418502 | 191 | dp->type = of_pdt_get_one_property(node, "device_type"); |
9bdf6bab AS |
192 | dp->phandle = node; |
193 | ||
ed418502 | 194 | dp->properties = of_pdt_build_prop_list(node); |
9bdf6bab AS |
195 | |
196 | irq_trans_init(dp); | |
197 | ||
198 | return dp; | |
199 | } | |
200 | ||
ed418502 | 201 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
9bdf6bab AS |
202 | { |
203 | int len, ourlen, plen; | |
204 | char *n; | |
205 | ||
206 | plen = strlen(dp->parent->full_name); | |
3cfc535c | 207 | ourlen = strlen(of_pdt_node_name(dp)); |
9bdf6bab AS |
208 | 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 | } | |
3cfc535c | 216 | strcpy(n + plen, of_pdt_node_name(dp)); |
9bdf6bab AS |
217 | |
218 | return n; | |
219 | } | |
220 | ||
ed418502 | 221 | static struct device_node * __init of_pdt_build_tree(struct device_node *parent, |
9bdf6bab AS |
222 | 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) { | |
ed418502 | 229 | dp = of_pdt_create_node(node, parent); |
9bdf6bab AS |
230 | 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 | ||
3cfc535c | 243 | #if defined(CONFIG_SPARC) |
9bdf6bab | 244 | dp->path_component_name = build_path_component(dp); |
3cfc535c | 245 | #endif |
ed418502 | 246 | dp->full_name = of_pdt_build_full_name(dp); |
9bdf6bab | 247 | |
ed418502 | 248 | dp->child = of_pdt_build_tree(dp, |
f90c34bd | 249 | of_pdt_prom_ops->getchild(node), nextp); |
9bdf6bab | 250 | |
ed418502 AS |
251 | if (of_pdt_build_more) |
252 | of_pdt_build_more(dp, nextp); | |
9bdf6bab | 253 | |
f90c34bd | 254 | node = of_pdt_prom_ops->getsibling(node); |
9bdf6bab AS |
255 | } |
256 | ||
257 | return ret; | |
258 | } | |
259 | ||
f90c34bd | 260 | void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) |
9bdf6bab AS |
261 | { |
262 | struct device_node **nextp; | |
263 | ||
f90c34bd AS |
264 | BUG_ON(!ops); |
265 | of_pdt_prom_ops = ops; | |
266 | ||
ed418502 | 267 | allnodes = of_pdt_create_node(root_node, NULL); |
3cfc535c | 268 | #if defined(CONFIG_SPARC) |
9bdf6bab | 269 | allnodes->path_component_name = ""; |
3cfc535c | 270 | #endif |
9bdf6bab AS |
271 | allnodes->full_name = "/"; |
272 | ||
273 | nextp = &allnodes->allnext; | |
ed418502 | 274 | allnodes->child = of_pdt_build_tree(allnodes, |
f90c34bd | 275 | of_pdt_prom_ops->getchild(allnodes->phandle), &nextp); |
9bdf6bab | 276 | } |