Commit | Line | Data |
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372b07bb DM |
1 | /* |
2 | * Procedures for creating, accessing and interpreting the device tree. | |
3 | * | |
4 | * Paul Mackerras August 1996. | |
5 | * Copyright (C) 1996-2005 Paul Mackerras. | |
6 | * | |
7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
8 | * {engebret|bergner}@us.ibm.com | |
9 | * | |
10 | * Adapted for sparc64 by David S. Miller davem@davemloft.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/types.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/bootmem.h> | |
de8d28b1 | 23 | #include <linux/module.h> |
372b07bb DM |
24 | |
25 | #include <asm/prom.h> | |
26 | #include <asm/oplib.h> | |
27 | ||
28 | static struct device_node *allnodes; | |
29 | ||
30 | struct device_node *of_get_parent(const struct device_node *node) | |
31 | { | |
32 | struct device_node *np; | |
33 | ||
34 | if (!node) | |
35 | return NULL; | |
36 | ||
37 | np = node->parent; | |
38 | ||
39 | return np; | |
40 | } | |
41 | ||
42 | struct device_node *of_get_next_child(const struct device_node *node, | |
43 | struct device_node *prev) | |
44 | { | |
45 | struct device_node *next; | |
46 | ||
47 | next = prev ? prev->sibling : node->child; | |
48 | for (; next != 0; next = next->sibling) { | |
49 | break; | |
50 | } | |
51 | ||
52 | return next; | |
53 | } | |
54 | ||
55 | struct device_node *of_find_node_by_path(const char *path) | |
56 | { | |
57 | struct device_node *np = allnodes; | |
58 | ||
59 | for (; np != 0; np = np->allnext) { | |
60 | if (np->full_name != 0 && strcmp(np->full_name, path) == 0) | |
61 | break; | |
62 | } | |
63 | ||
64 | return np; | |
65 | } | |
66 | ||
de8d28b1 DM |
67 | struct device_node *of_find_node_by_phandle(phandle handle) |
68 | { | |
69 | struct device_node *np; | |
70 | ||
71 | for (np = allnodes; np != 0; np = np->allnext) | |
72 | if (np->node == handle) | |
73 | break; | |
74 | ||
75 | return np; | |
76 | } | |
77 | ||
aaf7cec2 DM |
78 | struct device_node *of_find_node_by_name(struct device_node *from, |
79 | const char *name) | |
80 | { | |
81 | struct device_node *np; | |
82 | ||
83 | np = from ? from->allnext : allnodes; | |
84 | for (; np != NULL; np = np->allnext) | |
85 | if (np->name != NULL && strcmp(np->name, name) == 0) | |
86 | break; | |
87 | ||
88 | return np; | |
89 | } | |
90 | ||
91 | struct device_node *of_find_node_by_type(struct device_node *from, | |
92 | const char *type) | |
93 | { | |
94 | struct device_node *np; | |
95 | ||
96 | np = from ? from->allnext : allnodes; | |
97 | for (; np != 0; np = np->allnext) | |
98 | if (np->type != 0 && strcmp(np->type, type) == 0) | |
99 | break; | |
100 | ||
101 | return np; | |
102 | } | |
103 | ||
372b07bb DM |
104 | struct property *of_find_property(struct device_node *np, const char *name, |
105 | int *lenp) | |
106 | { | |
107 | struct property *pp; | |
108 | ||
109 | for (pp = np->properties; pp != 0; pp = pp->next) { | |
110 | if (strcmp(pp->name, name) == 0) { | |
111 | if (lenp != 0) | |
112 | *lenp = pp->length; | |
113 | break; | |
114 | } | |
115 | } | |
116 | return pp; | |
117 | } | |
de8d28b1 DM |
118 | EXPORT_SYMBOL(of_find_property); |
119 | ||
120 | /* | |
121 | * Find a property with a given name for a given node | |
122 | * and return the value. | |
123 | */ | |
124 | void *of_get_property(struct device_node *np, const char *name, int *lenp) | |
125 | { | |
126 | struct property *pp = of_find_property(np,name,lenp); | |
127 | return pp ? pp->value : NULL; | |
128 | } | |
129 | EXPORT_SYMBOL(of_get_property); | |
372b07bb | 130 | |
6d307724 DM |
131 | int of_getintprop_default(struct device_node *np, const char *name, int def) |
132 | { | |
133 | struct property *prop; | |
134 | int len; | |
135 | ||
136 | prop = of_find_property(np, name, &len); | |
137 | if (!prop || len != 4) | |
138 | return def; | |
139 | ||
140 | return *(int *) prop->value; | |
141 | } | |
de8d28b1 | 142 | EXPORT_SYMBOL(of_getintprop_default); |
6d307724 | 143 | |
372b07bb DM |
144 | static unsigned int prom_early_allocated; |
145 | ||
146 | static void * __init prom_early_alloc(unsigned long size) | |
147 | { | |
148 | void *ret; | |
149 | ||
150 | ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL); | |
151 | if (ret != NULL) | |
152 | memset(ret, 0, size); | |
153 | ||
154 | prom_early_allocated += size; | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int is_root_node(const struct device_node *dp) | |
160 | { | |
161 | if (!dp) | |
162 | return 0; | |
163 | ||
164 | return (dp->parent == NULL); | |
165 | } | |
166 | ||
167 | /* The following routines deal with the black magic of fully naming a | |
168 | * node. | |
169 | * | |
170 | * Certain well known named nodes are just the simple name string. | |
171 | * | |
172 | * Actual devices have an address specifier appended to the base name | |
173 | * string, like this "foo@addr". The "addr" can be in any number of | |
174 | * formats, and the platform plus the type of the node determine the | |
175 | * format and how it is constructed. | |
176 | * | |
177 | * For children of the ROOT node, the naming convention is fixed and | |
178 | * determined by whether this is a sun4u or sun4v system. | |
179 | * | |
180 | * For children of other nodes, it is bus type specific. So | |
181 | * we walk up the tree until we discover a "device_type" property | |
182 | * we recognize and we go from there. | |
183 | * | |
184 | * As an example, the boot device on my workstation has a full path: | |
185 | * | |
186 | * /pci@1e,600000/ide@d/disk@0,0:c | |
187 | */ | |
188 | static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf) | |
189 | { | |
190 | struct linux_prom64_registers *regs; | |
191 | struct property *rprop; | |
192 | u32 high_bits, low_bits, type; | |
193 | ||
194 | rprop = of_find_property(dp, "reg", NULL); | |
195 | if (!rprop) | |
196 | return; | |
197 | ||
198 | regs = rprop->value; | |
199 | if (!is_root_node(dp->parent)) { | |
200 | sprintf(tmp_buf, "%s@%x,%x", | |
201 | dp->name, | |
202 | (unsigned int) (regs->phys_addr >> 32UL), | |
203 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); | |
204 | return; | |
205 | } | |
206 | ||
207 | type = regs->phys_addr >> 60UL; | |
208 | high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL; | |
209 | low_bits = (regs->phys_addr & 0xffffffffUL); | |
210 | ||
211 | if (type == 0 || type == 8) { | |
212 | const char *prefix = (type == 0) ? "m" : "i"; | |
213 | ||
214 | if (low_bits) | |
215 | sprintf(tmp_buf, "%s@%s%x,%x", | |
216 | dp->name, prefix, | |
217 | high_bits, low_bits); | |
218 | else | |
219 | sprintf(tmp_buf, "%s@%s%x", | |
220 | dp->name, | |
221 | prefix, | |
222 | high_bits); | |
223 | } else if (type == 12) { | |
224 | sprintf(tmp_buf, "%s@%x", | |
225 | dp->name, high_bits); | |
226 | } | |
227 | } | |
228 | ||
229 | static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf) | |
230 | { | |
231 | struct linux_prom64_registers *regs; | |
232 | struct property *prop; | |
233 | ||
234 | prop = of_find_property(dp, "reg", NULL); | |
235 | if (!prop) | |
236 | return; | |
237 | ||
238 | regs = prop->value; | |
239 | if (!is_root_node(dp->parent)) { | |
240 | sprintf(tmp_buf, "%s@%x,%x", | |
241 | dp->name, | |
242 | (unsigned int) (regs->phys_addr >> 32UL), | |
243 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); | |
244 | return; | |
245 | } | |
246 | ||
247 | prop = of_find_property(dp, "upa-portid", NULL); | |
248 | if (!prop) | |
249 | prop = of_find_property(dp, "portid", NULL); | |
250 | if (prop) { | |
251 | unsigned long mask = 0xffffffffUL; | |
252 | ||
253 | if (tlb_type >= cheetah) | |
254 | mask = 0x7fffff; | |
255 | ||
256 | sprintf(tmp_buf, "%s@%x,%x", | |
257 | dp->name, | |
258 | *(u32 *)prop->value, | |
259 | (unsigned int) (regs->phys_addr & mask)); | |
260 | } | |
261 | } | |
262 | ||
263 | /* "name@slot,offset" */ | |
264 | static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) | |
265 | { | |
266 | struct linux_prom_registers *regs; | |
267 | struct property *prop; | |
268 | ||
269 | prop = of_find_property(dp, "reg", NULL); | |
270 | if (!prop) | |
271 | return; | |
272 | ||
273 | regs = prop->value; | |
274 | sprintf(tmp_buf, "%s@%x,%x", | |
275 | dp->name, | |
276 | regs->which_io, | |
277 | regs->phys_addr); | |
278 | } | |
279 | ||
280 | /* "name@devnum[,func]" */ | |
281 | static void __init pci_path_component(struct device_node *dp, char *tmp_buf) | |
282 | { | |
283 | struct linux_prom_pci_registers *regs; | |
284 | struct property *prop; | |
285 | unsigned int devfn; | |
286 | ||
287 | prop = of_find_property(dp, "reg", NULL); | |
288 | if (!prop) | |
289 | return; | |
290 | ||
291 | regs = prop->value; | |
292 | devfn = (regs->phys_hi >> 8) & 0xff; | |
293 | if (devfn & 0x07) { | |
294 | sprintf(tmp_buf, "%s@%x,%x", | |
295 | dp->name, | |
296 | devfn >> 3, | |
297 | devfn & 0x07); | |
298 | } else { | |
299 | sprintf(tmp_buf, "%s@%x", | |
300 | dp->name, | |
301 | devfn >> 3); | |
302 | } | |
303 | } | |
304 | ||
305 | /* "name@UPA_PORTID,offset" */ | |
306 | static void __init upa_path_component(struct device_node *dp, char *tmp_buf) | |
307 | { | |
308 | struct linux_prom64_registers *regs; | |
309 | struct property *prop; | |
310 | ||
311 | prop = of_find_property(dp, "reg", NULL); | |
312 | if (!prop) | |
313 | return; | |
314 | ||
315 | regs = prop->value; | |
316 | ||
317 | prop = of_find_property(dp, "upa-portid", NULL); | |
318 | if (!prop) | |
319 | return; | |
320 | ||
321 | sprintf(tmp_buf, "%s@%x,%x", | |
322 | dp->name, | |
323 | *(u32 *) prop->value, | |
324 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); | |
325 | } | |
326 | ||
327 | /* "name@reg" */ | |
328 | static void __init vdev_path_component(struct device_node *dp, char *tmp_buf) | |
329 | { | |
330 | struct property *prop; | |
331 | u32 *regs; | |
332 | ||
333 | prop = of_find_property(dp, "reg", NULL); | |
334 | if (!prop) | |
335 | return; | |
336 | ||
337 | regs = prop->value; | |
338 | ||
339 | sprintf(tmp_buf, "%s@%x", dp->name, *regs); | |
340 | } | |
341 | ||
342 | /* "name@addrhi,addrlo" */ | |
343 | static void __init ebus_path_component(struct device_node *dp, char *tmp_buf) | |
344 | { | |
345 | struct linux_prom64_registers *regs; | |
346 | struct property *prop; | |
347 | ||
348 | prop = of_find_property(dp, "reg", NULL); | |
349 | if (!prop) | |
350 | return; | |
351 | ||
352 | regs = prop->value; | |
353 | ||
354 | sprintf(tmp_buf, "%s@%x,%x", | |
355 | dp->name, | |
356 | (unsigned int) (regs->phys_addr >> 32UL), | |
357 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); | |
358 | } | |
359 | ||
360 | /* "name@bus,addr" */ | |
361 | static void __init i2c_path_component(struct device_node *dp, char *tmp_buf) | |
362 | { | |
363 | struct property *prop; | |
364 | u32 *regs; | |
365 | ||
366 | prop = of_find_property(dp, "reg", NULL); | |
367 | if (!prop) | |
368 | return; | |
369 | ||
370 | regs = prop->value; | |
371 | ||
372 | /* This actually isn't right... should look at the #address-cells | |
373 | * property of the i2c bus node etc. etc. | |
374 | */ | |
375 | sprintf(tmp_buf, "%s@%x,%x", | |
376 | dp->name, regs[0], regs[1]); | |
377 | } | |
378 | ||
379 | /* "name@reg0[,reg1]" */ | |
380 | static void __init usb_path_component(struct device_node *dp, char *tmp_buf) | |
381 | { | |
382 | struct property *prop; | |
383 | u32 *regs; | |
384 | ||
385 | prop = of_find_property(dp, "reg", NULL); | |
386 | if (!prop) | |
387 | return; | |
388 | ||
389 | regs = prop->value; | |
390 | ||
391 | if (prop->length == sizeof(u32) || regs[1] == 1) { | |
392 | sprintf(tmp_buf, "%s@%x", | |
393 | dp->name, regs[0]); | |
394 | } else { | |
395 | sprintf(tmp_buf, "%s@%x,%x", | |
396 | dp->name, regs[0], regs[1]); | |
397 | } | |
398 | } | |
399 | ||
400 | /* "name@reg0reg1[,reg2reg3]" */ | |
401 | static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf) | |
402 | { | |
403 | struct property *prop; | |
404 | u32 *regs; | |
405 | ||
406 | prop = of_find_property(dp, "reg", NULL); | |
407 | if (!prop) | |
408 | return; | |
409 | ||
410 | regs = prop->value; | |
411 | ||
412 | if (regs[2] || regs[3]) { | |
413 | sprintf(tmp_buf, "%s@%08x%08x,%04x%08x", | |
414 | dp->name, regs[0], regs[1], regs[2], regs[3]); | |
415 | } else { | |
416 | sprintf(tmp_buf, "%s@%08x%08x", | |
417 | dp->name, regs[0], regs[1]); | |
418 | } | |
419 | } | |
420 | ||
421 | static void __init __build_path_component(struct device_node *dp, char *tmp_buf) | |
422 | { | |
423 | struct device_node *parent = dp->parent; | |
424 | ||
425 | if (parent != NULL) { | |
426 | if (!strcmp(parent->type, "pci") || | |
427 | !strcmp(parent->type, "pciex")) | |
428 | return pci_path_component(dp, tmp_buf); | |
429 | if (!strcmp(parent->type, "sbus")) | |
430 | return sbus_path_component(dp, tmp_buf); | |
431 | if (!strcmp(parent->type, "upa")) | |
432 | return upa_path_component(dp, tmp_buf); | |
433 | if (!strcmp(parent->type, "ebus")) | |
434 | return ebus_path_component(dp, tmp_buf); | |
435 | if (!strcmp(parent->name, "usb") || | |
436 | !strcmp(parent->name, "hub")) | |
437 | return usb_path_component(dp, tmp_buf); | |
438 | if (!strcmp(parent->type, "i2c")) | |
439 | return i2c_path_component(dp, tmp_buf); | |
440 | if (!strcmp(parent->type, "firewire")) | |
441 | return ieee1394_path_component(dp, tmp_buf); | |
442 | if (!strcmp(parent->type, "virtual-devices")) | |
443 | return vdev_path_component(dp, tmp_buf); | |
444 | ||
445 | /* "isa" is handled with platform naming */ | |
446 | } | |
447 | ||
448 | /* Use platform naming convention. */ | |
449 | if (tlb_type == hypervisor) | |
450 | return sun4v_path_component(dp, tmp_buf); | |
451 | else | |
452 | return sun4u_path_component(dp, tmp_buf); | |
453 | } | |
454 | ||
455 | static char * __init build_path_component(struct device_node *dp) | |
456 | { | |
457 | char tmp_buf[64], *n; | |
458 | ||
459 | tmp_buf[0] = '\0'; | |
460 | __build_path_component(dp, tmp_buf); | |
461 | if (tmp_buf[0] == '\0') | |
462 | strcpy(tmp_buf, dp->name); | |
463 | ||
464 | n = prom_early_alloc(strlen(tmp_buf) + 1); | |
465 | strcpy(n, tmp_buf); | |
466 | ||
467 | return n; | |
468 | } | |
469 | ||
470 | static char * __init build_full_name(struct device_node *dp) | |
471 | { | |
472 | int len, ourlen, plen; | |
473 | char *n; | |
474 | ||
475 | plen = strlen(dp->parent->full_name); | |
476 | ourlen = strlen(dp->path_component_name); | |
477 | len = ourlen + plen + 2; | |
478 | ||
479 | n = prom_early_alloc(len); | |
480 | strcpy(n, dp->parent->full_name); | |
481 | if (!is_root_node(dp->parent)) { | |
482 | strcpy(n + plen, "/"); | |
483 | plen++; | |
484 | } | |
485 | strcpy(n + plen, dp->path_component_name); | |
486 | ||
487 | return n; | |
488 | } | |
489 | ||
490 | static struct property * __init build_one_prop(phandle node, char *prev) | |
491 | { | |
492 | static struct property *tmp = NULL; | |
493 | struct property *p; | |
494 | ||
495 | if (tmp) { | |
496 | p = tmp; | |
497 | memset(p, 0, sizeof(*p) + 32); | |
498 | tmp = NULL; | |
499 | } else | |
500 | p = prom_early_alloc(sizeof(struct property) + 32); | |
501 | ||
502 | p->name = (char *) (p + 1); | |
503 | if (prev == NULL) { | |
504 | prom_firstprop(node, p->name); | |
505 | } else { | |
506 | prom_nextprop(node, prev, p->name); | |
507 | } | |
508 | if (strlen(p->name) == 0) { | |
509 | tmp = p; | |
510 | return NULL; | |
511 | } | |
512 | p->length = prom_getproplen(node, p->name); | |
513 | if (p->length <= 0) { | |
514 | p->length = 0; | |
515 | } else { | |
516 | p->value = prom_early_alloc(p->length); | |
517 | prom_getproperty(node, p->name, p->value, p->length); | |
518 | } | |
519 | return p; | |
520 | } | |
521 | ||
522 | static struct property * __init build_prop_list(phandle node) | |
523 | { | |
524 | struct property *head, *tail; | |
525 | ||
526 | head = tail = build_one_prop(node, NULL); | |
527 | while(tail) { | |
528 | tail->next = build_one_prop(node, tail->name); | |
529 | tail = tail->next; | |
530 | } | |
531 | ||
532 | return head; | |
533 | } | |
534 | ||
535 | static char * __init get_one_property(phandle node, const char *name) | |
536 | { | |
537 | char *buf = "<NULL>"; | |
538 | int len; | |
539 | ||
540 | len = prom_getproplen(node, name); | |
541 | if (len > 0) { | |
542 | buf = prom_early_alloc(len); | |
543 | prom_getproperty(node, name, buf, len); | |
544 | } | |
545 | ||
546 | return buf; | |
547 | } | |
548 | ||
549 | static struct device_node * __init create_node(phandle node) | |
550 | { | |
551 | struct device_node *dp; | |
552 | ||
553 | if (!node) | |
554 | return NULL; | |
555 | ||
556 | dp = prom_early_alloc(sizeof(*dp)); | |
557 | ||
558 | kref_init(&dp->kref); | |
559 | ||
560 | dp->name = get_one_property(node, "name"); | |
561 | dp->type = get_one_property(node, "device_type"); | |
562 | dp->node = node; | |
563 | ||
564 | /* Build interrupts later... */ | |
565 | ||
566 | dp->properties = build_prop_list(node); | |
567 | ||
568 | return dp; | |
569 | } | |
570 | ||
571 | static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp) | |
572 | { | |
573 | struct device_node *dp; | |
574 | ||
575 | dp = create_node(node); | |
576 | if (dp) { | |
577 | *(*nextp) = dp; | |
578 | *nextp = &dp->allnext; | |
579 | ||
580 | dp->parent = parent; | |
581 | dp->path_component_name = build_path_component(dp); | |
582 | dp->full_name = build_full_name(dp); | |
583 | ||
584 | dp->child = build_tree(dp, prom_getchild(node), nextp); | |
585 | ||
586 | dp->sibling = build_tree(parent, prom_getsibling(node), nextp); | |
587 | } | |
588 | ||
589 | return dp; | |
590 | } | |
591 | ||
592 | void __init prom_build_devicetree(void) | |
593 | { | |
594 | struct device_node **nextp; | |
595 | ||
596 | allnodes = create_node(prom_root_node); | |
597 | allnodes->path_component_name = ""; | |
598 | allnodes->full_name = "/"; | |
599 | ||
600 | nextp = &allnodes->allnext; | |
601 | allnodes->child = build_tree(allnodes, | |
602 | prom_getchild(allnodes->node), | |
603 | &nextp); | |
604 | printk("PROM: Built device tree with %u bytes of memory.\n", | |
605 | prom_early_allocated); | |
606 | } |