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> |
f90c34bd AS |
25 | |
26 | static struct of_pdt_ops *of_pdt_prom_ops __initdata; | |
9bdf6bab | 27 | |
5063e25a | 28 | void __initdata (*of_pdt_build_more)(struct device_node *dp); |
9bdf6bab | 29 | |
3cfc535c AS |
30 | #if defined(CONFIG_SPARC) |
31 | unsigned int of_pdt_unique_id __initdata; | |
32 | ||
33 | #define of_pdt_incr_unique_id(p) do { \ | |
34 | (p)->unique_id = of_pdt_unique_id++; \ | |
35 | } while (0) | |
36 | ||
a74ea43d | 37 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 38 | { |
a74ea43d AS |
39 | int len, ourlen, plen; |
40 | char *n; | |
41 | ||
42 | dp->path_component_name = build_path_component(dp); | |
43 | ||
44 | plen = strlen(dp->parent->full_name); | |
45 | ourlen = strlen(dp->path_component_name); | |
46 | len = ourlen + plen + 2; | |
47 | ||
48 | n = prom_early_alloc(len); | |
49 | strcpy(n, dp->parent->full_name); | |
50 | if (!of_node_is_root(dp->parent)) { | |
51 | strcpy(n + plen, "/"); | |
52 | plen++; | |
53 | } | |
54 | strcpy(n + plen, dp->path_component_name); | |
55 | ||
56 | return n; | |
3cfc535c AS |
57 | } |
58 | ||
a74ea43d | 59 | #else /* CONFIG_SPARC */ |
3cfc535c AS |
60 | |
61 | static inline void of_pdt_incr_unique_id(void *p) { } | |
62 | static inline void irq_trans_init(struct device_node *dp) { } | |
63 | ||
a74ea43d | 64 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
3cfc535c | 65 | { |
a74ea43d AS |
66 | static int failsafe_id = 0; /* for generating unique names on failure */ |
67 | char *buf; | |
68 | int len; | |
69 | ||
70 | if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len)) | |
71 | goto failsafe; | |
72 | ||
73 | buf = prom_early_alloc(len + 1); | |
74 | if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len)) | |
75 | goto failsafe; | |
76 | return buf; | |
77 | ||
78 | failsafe: | |
79 | buf = prom_early_alloc(strlen(dp->parent->full_name) + | |
80 | strlen(dp->name) + 16); | |
81 | sprintf(buf, "%s/%s@unknown%i", | |
82 | of_node_is_root(dp->parent) ? "" : dp->parent->full_name, | |
83 | dp->name, failsafe_id++); | |
84 | pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf); | |
85 | return buf; | |
3cfc535c AS |
86 | } |
87 | ||
88 | #endif /* !CONFIG_SPARC */ | |
9bdf6bab | 89 | |
ed418502 | 90 | static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, |
9bdf6bab AS |
91 | char *special_name, |
92 | void *special_val, | |
93 | int special_len) | |
94 | { | |
95 | static struct property *tmp = NULL; | |
96 | struct property *p; | |
f90c34bd | 97 | int err; |
9bdf6bab AS |
98 | |
99 | if (tmp) { | |
100 | p = tmp; | |
101 | memset(p, 0, sizeof(*p) + 32); | |
102 | tmp = NULL; | |
103 | } else { | |
104 | p = prom_early_alloc(sizeof(struct property) + 32); | |
3cfc535c | 105 | of_pdt_incr_unique_id(p); |
9bdf6bab AS |
106 | } |
107 | ||
108 | p->name = (char *) (p + 1); | |
109 | if (special_name) { | |
110 | strcpy(p->name, special_name); | |
111 | p->length = special_len; | |
112 | p->value = prom_early_alloc(special_len); | |
113 | memcpy(p->value, special_val, special_len); | |
114 | } else { | |
f90c34bd AS |
115 | err = of_pdt_prom_ops->nextprop(node, prev, p->name); |
116 | if (err) { | |
9bdf6bab AS |
117 | tmp = p; |
118 | return NULL; | |
119 | } | |
f90c34bd | 120 | p->length = of_pdt_prom_ops->getproplen(node, p->name); |
9bdf6bab AS |
121 | if (p->length <= 0) { |
122 | p->length = 0; | |
123 | } else { | |
124 | int len; | |
125 | ||
126 | p->value = prom_early_alloc(p->length + 1); | |
f90c34bd AS |
127 | len = of_pdt_prom_ops->getproperty(node, p->name, |
128 | p->value, p->length); | |
9bdf6bab AS |
129 | if (len <= 0) |
130 | p->length = 0; | |
131 | ((unsigned char *)p->value)[p->length] = '\0'; | |
132 | } | |
133 | } | |
134 | return p; | |
135 | } | |
136 | ||
ed418502 | 137 | static struct property * __init of_pdt_build_prop_list(phandle node) |
9bdf6bab AS |
138 | { |
139 | struct property *head, *tail; | |
140 | ||
ed418502 | 141 | head = tail = of_pdt_build_one_prop(node, NULL, |
9bdf6bab AS |
142 | ".node", &node, sizeof(node)); |
143 | ||
ed418502 | 144 | tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); |
9bdf6bab AS |
145 | tail = tail->next; |
146 | while(tail) { | |
ed418502 | 147 | tail->next = of_pdt_build_one_prop(node, tail->name, |
9bdf6bab AS |
148 | NULL, NULL, 0); |
149 | tail = tail->next; | |
150 | } | |
151 | ||
152 | return head; | |
153 | } | |
154 | ||
ed418502 | 155 | static char * __init of_pdt_get_one_property(phandle node, const char *name) |
9bdf6bab AS |
156 | { |
157 | char *buf = "<NULL>"; | |
158 | int len; | |
159 | ||
f90c34bd | 160 | len = of_pdt_prom_ops->getproplen(node, name); |
9bdf6bab AS |
161 | if (len > 0) { |
162 | buf = prom_early_alloc(len); | |
f90c34bd | 163 | len = of_pdt_prom_ops->getproperty(node, name, buf, len); |
9bdf6bab AS |
164 | } |
165 | ||
166 | return buf; | |
167 | } | |
168 | ||
ed418502 | 169 | static struct device_node * __init of_pdt_create_node(phandle node, |
9bdf6bab AS |
170 | struct device_node *parent) |
171 | { | |
172 | struct device_node *dp; | |
173 | ||
174 | if (!node) | |
175 | return NULL; | |
176 | ||
177 | dp = prom_early_alloc(sizeof(*dp)); | |
0829f6d1 | 178 | of_node_init(dp); |
3cfc535c | 179 | of_pdt_incr_unique_id(dp); |
9bdf6bab AS |
180 | dp->parent = parent; |
181 | ||
a74ea43d | 182 | dp->name = of_pdt_get_one_property(node, "name"); |
ed418502 | 183 | dp->type = of_pdt_get_one_property(node, "device_type"); |
9bdf6bab AS |
184 | dp->phandle = node; |
185 | ||
ed418502 | 186 | dp->properties = of_pdt_build_prop_list(node); |
9bdf6bab AS |
187 | |
188 | irq_trans_init(dp); | |
189 | ||
190 | return dp; | |
191 | } | |
192 | ||
ed418502 | 193 | static struct device_node * __init of_pdt_build_tree(struct device_node *parent, |
5063e25a | 194 | phandle node) |
9bdf6bab AS |
195 | { |
196 | struct device_node *ret = NULL, *prev_sibling = NULL; | |
197 | struct device_node *dp; | |
198 | ||
199 | while (1) { | |
ed418502 | 200 | dp = of_pdt_create_node(node, parent); |
9bdf6bab AS |
201 | if (!dp) |
202 | break; | |
203 | ||
204 | if (prev_sibling) | |
205 | prev_sibling->sibling = dp; | |
206 | ||
207 | if (!ret) | |
208 | ret = dp; | |
209 | prev_sibling = dp; | |
210 | ||
ed418502 | 211 | dp->full_name = of_pdt_build_full_name(dp); |
9bdf6bab | 212 | |
5063e25a | 213 | dp->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node)); |
9bdf6bab | 214 | |
ed418502 | 215 | if (of_pdt_build_more) |
5063e25a | 216 | of_pdt_build_more(dp); |
9bdf6bab | 217 | |
f90c34bd | 218 | node = of_pdt_prom_ops->getsibling(node); |
9bdf6bab AS |
219 | } |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
75c71848 | 224 | static void * __init kernel_tree_alloc(u64 size, u64 align) |
611cad72 SG |
225 | { |
226 | return prom_early_alloc(size); | |
227 | } | |
228 | ||
f90c34bd | 229 | void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) |
9bdf6bab | 230 | { |
f90c34bd AS |
231 | BUG_ON(!ops); |
232 | of_pdt_prom_ops = ops; | |
233 | ||
5063e25a | 234 | of_root = of_pdt_create_node(root_node, NULL); |
3cfc535c | 235 | #if defined(CONFIG_SPARC) |
5063e25a | 236 | of_root->path_component_name = ""; |
3cfc535c | 237 | #endif |
5063e25a | 238 | of_root->full_name = "/"; |
9bdf6bab | 239 | |
5063e25a GL |
240 | of_root->child = of_pdt_build_tree(of_root, |
241 | of_pdt_prom_ops->getchild(of_root->phandle)); | |
611cad72 | 242 | |
4c7d6361 | 243 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 244 | of_alias_scan(kernel_tree_alloc); |
9bdf6bab | 245 | } |