Commit | Line | Data |
---|---|---|
b00dc837 | 1 | /* |
1da177e4 LT |
2 | * tree.c: Basic device tree traversal/scanning for the Linux |
3 | * prom library. | |
4 | * | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | #include <linux/string.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/sched.h> | |
917c3660 | 13 | #include <linux/module.h> |
1da177e4 LT |
14 | |
15 | #include <asm/openprom.h> | |
16 | #include <asm/oplib.h> | |
b3e13fbe | 17 | #include <asm/ldc.h> |
1da177e4 | 18 | |
8d125562 | 19 | static phandle prom_node_to_node(const char *type, phandle node) |
25edd694 DM |
20 | { |
21 | unsigned long args[5]; | |
22 | ||
23 | args[0] = (unsigned long) type; | |
24 | args[1] = 1; | |
25 | args[2] = 1; | |
26 | args[3] = (unsigned int) node; | |
27 | args[4] = (unsigned long) -1; | |
28 | ||
29 | p1275_cmd_direct(args); | |
30 | ||
8d125562 | 31 | return (phandle) args[4]; |
25edd694 DM |
32 | } |
33 | ||
1da177e4 LT |
34 | /* Return the child of node 'node' or zero if no this node has no |
35 | * direct descendent. | |
36 | */ | |
8d125562 | 37 | inline phandle __prom_getchild(phandle node) |
1da177e4 | 38 | { |
25edd694 | 39 | return prom_node_to_node("child", node); |
1da177e4 LT |
40 | } |
41 | ||
8d125562 | 42 | inline phandle prom_getchild(phandle node) |
1da177e4 | 43 | { |
8d125562 | 44 | phandle cnode; |
1da177e4 | 45 | |
25edd694 DM |
46 | if (node == -1) |
47 | return 0; | |
1da177e4 | 48 | cnode = __prom_getchild(node); |
25edd694 DM |
49 | if (cnode == -1) |
50 | return 0; | |
51 | return cnode; | |
1da177e4 | 52 | } |
917c3660 | 53 | EXPORT_SYMBOL(prom_getchild); |
1da177e4 | 54 | |
8d125562 | 55 | inline phandle prom_getparent(phandle node) |
1da177e4 | 56 | { |
8d125562 | 57 | phandle cnode; |
1da177e4 | 58 | |
25edd694 DM |
59 | if (node == -1) |
60 | return 0; | |
61 | cnode = prom_node_to_node("parent", node); | |
62 | if (cnode == -1) | |
63 | return 0; | |
64 | return cnode; | |
1da177e4 LT |
65 | } |
66 | ||
67 | /* Return the next sibling of node 'node' or zero if no more siblings | |
68 | * at this level of depth in the tree. | |
69 | */ | |
8d125562 | 70 | inline phandle __prom_getsibling(phandle node) |
1da177e4 | 71 | { |
25edd694 | 72 | return prom_node_to_node(prom_peer_name, node); |
1da177e4 LT |
73 | } |
74 | ||
8d125562 | 75 | inline phandle prom_getsibling(phandle node) |
1da177e4 | 76 | { |
8d125562 | 77 | phandle sibnode; |
1da177e4 | 78 | |
d82ace7d DM |
79 | if (node == -1) |
80 | return 0; | |
1da177e4 | 81 | sibnode = __prom_getsibling(node); |
d82ace7d DM |
82 | if (sibnode == -1) |
83 | return 0; | |
84 | ||
1da177e4 LT |
85 | return sibnode; |
86 | } | |
917c3660 | 87 | EXPORT_SYMBOL(prom_getsibling); |
1da177e4 LT |
88 | |
89 | /* Return the length in bytes of property 'prop' at node 'node'. | |
90 | * Return -1 on error. | |
91 | */ | |
8d125562 | 92 | inline int prom_getproplen(phandle node, const char *prop) |
1da177e4 | 93 | { |
25edd694 DM |
94 | unsigned long args[6]; |
95 | ||
96 | if (!node || !prop) | |
97 | return -1; | |
98 | ||
99 | args[0] = (unsigned long) "getproplen"; | |
100 | args[1] = 2; | |
101 | args[2] = 1; | |
102 | args[3] = (unsigned int) node; | |
103 | args[4] = (unsigned long) prop; | |
104 | args[5] = (unsigned long) -1; | |
105 | ||
106 | p1275_cmd_direct(args); | |
107 | ||
108 | return (int) args[5]; | |
1da177e4 | 109 | } |
917c3660 | 110 | EXPORT_SYMBOL(prom_getproplen); |
1da177e4 LT |
111 | |
112 | /* Acquire a property 'prop' at node 'node' and place it in | |
113 | * 'buffer' which has a size of 'bufsize'. If the acquisition | |
114 | * was successful the length will be returned, else -1 is returned. | |
115 | */ | |
8d125562 | 116 | inline int prom_getproperty(phandle node, const char *prop, |
d979f179 | 117 | char *buffer, int bufsize) |
1da177e4 | 118 | { |
25edd694 | 119 | unsigned long args[8]; |
1da177e4 LT |
120 | int plen; |
121 | ||
122 | plen = prom_getproplen(node, prop); | |
25edd694 | 123 | if ((plen > bufsize) || (plen == 0) || (plen == -1)) |
1da177e4 | 124 | return -1; |
25edd694 DM |
125 | |
126 | args[0] = (unsigned long) prom_getprop_name; | |
127 | args[1] = 4; | |
128 | args[2] = 1; | |
129 | args[3] = (unsigned int) node; | |
130 | args[4] = (unsigned long) prop; | |
131 | args[5] = (unsigned long) buffer; | |
132 | args[6] = bufsize; | |
133 | args[7] = (unsigned long) -1; | |
134 | ||
135 | p1275_cmd_direct(args); | |
136 | ||
137 | return (int) args[7]; | |
1da177e4 | 138 | } |
917c3660 | 139 | EXPORT_SYMBOL(prom_getproperty); |
1da177e4 LT |
140 | |
141 | /* Acquire an integer property and return its value. Returns -1 | |
142 | * on failure. | |
143 | */ | |
8d125562 | 144 | inline int prom_getint(phandle node, const char *prop) |
1da177e4 LT |
145 | { |
146 | int intprop; | |
147 | ||
25edd694 | 148 | if (prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1) |
1da177e4 LT |
149 | return intprop; |
150 | ||
151 | return -1; | |
152 | } | |
917c3660 | 153 | EXPORT_SYMBOL(prom_getint); |
1da177e4 LT |
154 | |
155 | /* Acquire an integer property, upon error return the passed default | |
156 | * integer. | |
157 | */ | |
158 | ||
8d125562 | 159 | int prom_getintdefault(phandle node, const char *property, int deflt) |
1da177e4 LT |
160 | { |
161 | int retval; | |
162 | ||
163 | retval = prom_getint(node, property); | |
25edd694 DM |
164 | if (retval == -1) |
165 | return deflt; | |
1da177e4 LT |
166 | |
167 | return retval; | |
168 | } | |
917c3660 | 169 | EXPORT_SYMBOL(prom_getintdefault); |
1da177e4 LT |
170 | |
171 | /* Acquire a boolean property, 1=TRUE 0=FALSE. */ | |
8d125562 | 172 | int prom_getbool(phandle node, const char *prop) |
1da177e4 LT |
173 | { |
174 | int retval; | |
175 | ||
176 | retval = prom_getproplen(node, prop); | |
25edd694 DM |
177 | if (retval == -1) |
178 | return 0; | |
1da177e4 LT |
179 | return 1; |
180 | } | |
917c3660 | 181 | EXPORT_SYMBOL(prom_getbool); |
1da177e4 LT |
182 | |
183 | /* Acquire a property whose value is a string, returns a null | |
184 | * string on error. The char pointer is the user supplied string | |
185 | * buffer. | |
186 | */ | |
8d125562 AS |
187 | void prom_getstring(phandle node, const char *prop, char *user_buf, |
188 | int ubuf_size) | |
1da177e4 LT |
189 | { |
190 | int len; | |
191 | ||
192 | len = prom_getproperty(node, prop, user_buf, ubuf_size); | |
25edd694 DM |
193 | if (len != -1) |
194 | return; | |
1da177e4 | 195 | user_buf[0] = 0; |
1da177e4 | 196 | } |
917c3660 | 197 | EXPORT_SYMBOL(prom_getstring); |
1da177e4 LT |
198 | |
199 | /* Does the device at node 'node' have name 'name'? | |
200 | * YES = 1 NO = 0 | |
201 | */ | |
8d125562 | 202 | int prom_nodematch(phandle node, const char *name) |
1da177e4 LT |
203 | { |
204 | char namebuf[128]; | |
205 | prom_getproperty(node, "name", namebuf, sizeof(namebuf)); | |
25edd694 DM |
206 | if (strcmp(namebuf, name) == 0) |
207 | return 1; | |
1da177e4 LT |
208 | return 0; |
209 | } | |
210 | ||
211 | /* Search siblings at 'node_start' for a node with name | |
212 | * 'nodename'. Return node if successful, zero if not. | |
213 | */ | |
8d125562 | 214 | phandle prom_searchsiblings(phandle node_start, const char *nodename) |
1da177e4 | 215 | { |
8d125562 AS |
216 | phandle thisnode; |
217 | int error; | |
1da177e4 LT |
218 | char promlib_buf[128]; |
219 | ||
220 | for(thisnode = node_start; thisnode; | |
221 | thisnode=prom_getsibling(thisnode)) { | |
222 | error = prom_getproperty(thisnode, "name", promlib_buf, | |
223 | sizeof(promlib_buf)); | |
224 | /* Should this ever happen? */ | |
225 | if(error == -1) continue; | |
226 | if(strcmp(nodename, promlib_buf)==0) return thisnode; | |
227 | } | |
228 | ||
229 | return 0; | |
230 | } | |
917c3660 | 231 | EXPORT_SYMBOL(prom_searchsiblings); |
1da177e4 | 232 | |
25edd694 DM |
233 | static const char *prom_nextprop_name = "nextprop"; |
234 | ||
1da177e4 LT |
235 | /* Return the first property type for node 'node'. |
236 | * buffer should be at least 32B in length | |
237 | */ | |
8d125562 | 238 | inline char *prom_firstprop(phandle node, char *buffer) |
1da177e4 | 239 | { |
25edd694 DM |
240 | unsigned long args[7]; |
241 | ||
1da177e4 | 242 | *buffer = 0; |
25edd694 DM |
243 | if (node == -1) |
244 | return buffer; | |
245 | ||
246 | args[0] = (unsigned long) prom_nextprop_name; | |
247 | args[1] = 3; | |
248 | args[2] = 1; | |
249 | args[3] = (unsigned int) node; | |
250 | args[4] = 0; | |
251 | args[5] = (unsigned long) buffer; | |
252 | args[6] = (unsigned long) -1; | |
253 | ||
254 | p1275_cmd_direct(args); | |
255 | ||
1da177e4 LT |
256 | return buffer; |
257 | } | |
917c3660 | 258 | EXPORT_SYMBOL(prom_firstprop); |
1da177e4 LT |
259 | |
260 | /* Return the property type string after property type 'oprop' | |
261 | * at node 'node' . Returns NULL string if no more | |
262 | * property types for this node. | |
263 | */ | |
8d125562 | 264 | inline char *prom_nextprop(phandle node, const char *oprop, char *buffer) |
1da177e4 | 265 | { |
25edd694 | 266 | unsigned long args[7]; |
1da177e4 LT |
267 | char buf[32]; |
268 | ||
25edd694 | 269 | if (node == -1) { |
1da177e4 LT |
270 | *buffer = 0; |
271 | return buffer; | |
272 | } | |
273 | if (oprop == buffer) { | |
274 | strcpy (buf, oprop); | |
275 | oprop = buf; | |
276 | } | |
25edd694 DM |
277 | |
278 | args[0] = (unsigned long) prom_nextprop_name; | |
279 | args[1] = 3; | |
280 | args[2] = 1; | |
281 | args[3] = (unsigned int) node; | |
282 | args[4] = (unsigned long) oprop; | |
283 | args[5] = (unsigned long) buffer; | |
284 | args[6] = (unsigned long) -1; | |
285 | ||
286 | p1275_cmd_direct(args); | |
287 | ||
1da177e4 LT |
288 | return buffer; |
289 | } | |
917c3660 | 290 | EXPORT_SYMBOL(prom_nextprop); |
1da177e4 | 291 | |
8d125562 | 292 | phandle prom_finddevice(const char *name) |
1da177e4 | 293 | { |
25edd694 DM |
294 | unsigned long args[5]; |
295 | ||
bff06d55 DM |
296 | if (!name) |
297 | return 0; | |
25edd694 DM |
298 | args[0] = (unsigned long) "finddevice"; |
299 | args[1] = 1; | |
300 | args[2] = 1; | |
301 | args[3] = (unsigned long) name; | |
302 | args[4] = (unsigned long) -1; | |
303 | ||
304 | p1275_cmd_direct(args); | |
305 | ||
306 | return (int) args[4]; | |
1da177e4 | 307 | } |
917c3660 | 308 | EXPORT_SYMBOL(prom_finddevice); |
1da177e4 | 309 | |
8d125562 | 310 | int prom_node_has_property(phandle node, const char *prop) |
1da177e4 LT |
311 | { |
312 | char buf [32]; | |
313 | ||
314 | *buf = 0; | |
315 | do { | |
316 | prom_nextprop(node, buf, buf); | |
25edd694 | 317 | if (!strcmp(buf, prop)) |
1da177e4 LT |
318 | return 1; |
319 | } while (*buf); | |
320 | return 0; | |
321 | } | |
917c3660 SR |
322 | EXPORT_SYMBOL(prom_node_has_property); |
323 | ||
1da177e4 LT |
324 | /* Set property 'pname' at node 'node' to value 'value' which has a length |
325 | * of 'size' bytes. Return the number of bytes the prom accepted. | |
326 | */ | |
327 | int | |
8d125562 | 328 | prom_setprop(phandle node, const char *pname, char *value, int size) |
1da177e4 | 329 | { |
25edd694 DM |
330 | unsigned long args[8]; |
331 | ||
b3e13fbe DM |
332 | if (size == 0) |
333 | return 0; | |
334 | if ((pname == 0) || (value == 0)) | |
335 | return 0; | |
1da177e4 | 336 | |
b3e13fbe DM |
337 | #ifdef CONFIG_SUN_LDOMS |
338 | if (ldom_domaining_enabled) { | |
339 | ldom_set_var(pname, value); | |
340 | return 0; | |
341 | } | |
342 | #endif | |
25edd694 DM |
343 | args[0] = (unsigned long) "setprop"; |
344 | args[1] = 4; | |
345 | args[2] = 1; | |
346 | args[3] = (unsigned int) node; | |
347 | args[4] = (unsigned long) pname; | |
348 | args[5] = (unsigned long) value; | |
349 | args[6] = size; | |
350 | args[7] = (unsigned long) -1; | |
351 | ||
352 | p1275_cmd_direct(args); | |
353 | ||
354 | return (int) args[7]; | |
1da177e4 | 355 | } |
917c3660 | 356 | EXPORT_SYMBOL(prom_setprop); |
1da177e4 | 357 | |
8d125562 | 358 | inline phandle prom_inst2pkg(int inst) |
1da177e4 | 359 | { |
25edd694 | 360 | unsigned long args[5]; |
8d125562 | 361 | phandle node; |
1da177e4 | 362 | |
25edd694 DM |
363 | args[0] = (unsigned long) "instance-to-package"; |
364 | args[1] = 1; | |
365 | args[2] = 1; | |
366 | args[3] = (unsigned int) inst; | |
367 | args[4] = (unsigned long) -1; | |
368 | ||
369 | p1275_cmd_direct(args); | |
370 | ||
371 | node = (int) args[4]; | |
372 | if (node == -1) | |
373 | return 0; | |
1da177e4 LT |
374 | return node; |
375 | } | |
376 | ||
c73fcc84 DM |
377 | int prom_ihandle2path(int handle, char *buffer, int bufsize) |
378 | { | |
25edd694 DM |
379 | unsigned long args[7]; |
380 | ||
381 | args[0] = (unsigned long) "instance-to-path"; | |
382 | args[1] = 3; | |
383 | args[2] = 1; | |
384 | args[3] = (unsigned int) handle; | |
385 | args[4] = (unsigned long) buffer; | |
386 | args[5] = bufsize; | |
387 | args[6] = (unsigned long) -1; | |
388 | ||
389 | p1275_cmd_direct(args); | |
390 | ||
391 | return (int) args[6]; | |
c73fcc84 | 392 | } |