Root/
1 | /* pdt.c: OF PROM device tree support code. |
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 |
10 | * Adapted for multiple architectures by Andres Salomon <dilinger@queued.net> |
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> |
24 | #include <linux/of_pdt.h> |
25 | #include <asm/prom.h> |
26 | |
27 | static struct of_pdt_ops *of_pdt_prom_ops __initdata; |
28 | |
29 | void __initdata (*of_pdt_build_more)(struct device_node *dp, |
30 | struct device_node ***nextp); |
31 | |
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 char * __init of_pdt_build_full_name(struct device_node *dp) |
40 | { |
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; |
59 | } |
60 | |
61 | #else /* CONFIG_SPARC */ |
62 | |
63 | static inline void of_pdt_incr_unique_id(void *p) { } |
64 | static inline void irq_trans_init(struct device_node *dp) { } |
65 | |
66 | static char * __init of_pdt_build_full_name(struct device_node *dp) |
67 | { |
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; |
88 | } |
89 | |
90 | #endif /* !CONFIG_SPARC */ |
91 | |
92 | static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, |
93 | char *special_name, |
94 | void *special_val, |
95 | int special_len) |
96 | { |
97 | static struct property *tmp = NULL; |
98 | struct property *p; |
99 | int err; |
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); |
107 | of_pdt_incr_unique_id(p); |
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 { |
117 | err = of_pdt_prom_ops->nextprop(node, prev, p->name); |
118 | if (err) { |
119 | tmp = p; |
120 | return NULL; |
121 | } |
122 | p->length = of_pdt_prom_ops->getproplen(node, p->name); |
123 | if (p->length <= 0) { |
124 | p->length = 0; |
125 | } else { |
126 | int len; |
127 | |
128 | p->value = prom_early_alloc(p->length + 1); |
129 | len = of_pdt_prom_ops->getproperty(node, p->name, |
130 | p->value, p->length); |
131 | if (len <= 0) |
132 | p->length = 0; |
133 | ((unsigned char *)p->value)[p->length] = '\0'; |
134 | } |
135 | } |
136 | return p; |
137 | } |
138 | |
139 | static struct property * __init of_pdt_build_prop_list(phandle node) |
140 | { |
141 | struct property *head, *tail; |
142 | |
143 | head = tail = of_pdt_build_one_prop(node, NULL, |
144 | ".node", &node, sizeof(node)); |
145 | |
146 | tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); |
147 | tail = tail->next; |
148 | while(tail) { |
149 | tail->next = of_pdt_build_one_prop(node, tail->name, |
150 | NULL, NULL, 0); |
151 | tail = tail->next; |
152 | } |
153 | |
154 | return head; |
155 | } |
156 | |
157 | static char * __init of_pdt_get_one_property(phandle node, const char *name) |
158 | { |
159 | char *buf = "<NULL>"; |
160 | int len; |
161 | |
162 | len = of_pdt_prom_ops->getproplen(node, name); |
163 | if (len > 0) { |
164 | buf = prom_early_alloc(len); |
165 | len = of_pdt_prom_ops->getproperty(node, name, buf, len); |
166 | } |
167 | |
168 | return buf; |
169 | } |
170 | |
171 | static struct device_node * __init of_pdt_create_node(phandle node, |
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)); |
180 | of_pdt_incr_unique_id(dp); |
181 | dp->parent = parent; |
182 | |
183 | kref_init(&dp->kref); |
184 | |
185 | dp->name = of_pdt_get_one_property(node, "name"); |
186 | dp->type = of_pdt_get_one_property(node, "device_type"); |
187 | dp->phandle = node; |
188 | |
189 | dp->properties = of_pdt_build_prop_list(node); |
190 | |
191 | irq_trans_init(dp); |
192 | |
193 | return dp; |
194 | } |
195 | |
196 | static struct device_node * __init of_pdt_build_tree(struct device_node *parent, |
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) { |
204 | dp = of_pdt_create_node(node, parent); |
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 | |
218 | dp->full_name = of_pdt_build_full_name(dp); |
219 | |
220 | dp->child = of_pdt_build_tree(dp, |
221 | of_pdt_prom_ops->getchild(node), nextp); |
222 | |
223 | if (of_pdt_build_more) |
224 | of_pdt_build_more(dp, nextp); |
225 | |
226 | node = of_pdt_prom_ops->getsibling(node); |
227 | } |
228 | |
229 | return ret; |
230 | } |
231 | |
232 | static void * __init kernel_tree_alloc(u64 size, u64 align) |
233 | { |
234 | return prom_early_alloc(size); |
235 | } |
236 | |
237 | void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) |
238 | { |
239 | struct device_node **nextp; |
240 | |
241 | BUG_ON(!ops); |
242 | of_pdt_prom_ops = ops; |
243 | |
244 | of_allnodes = of_pdt_create_node(root_node, NULL); |
245 | #if defined(CONFIG_SPARC) |
246 | of_allnodes->path_component_name = ""; |
247 | #endif |
248 | of_allnodes->full_name = "/"; |
249 | |
250 | nextp = &of_allnodes->allnext; |
251 | of_allnodes->child = of_pdt_build_tree(of_allnodes, |
252 | of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp); |
253 | |
254 | /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */ |
255 | of_alias_scan(kernel_tree_alloc); |
256 | } |
257 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9