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Commit | Line | Data |
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9b6b563c PM |
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 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #undef DEBUG | |
17 | ||
18 | #include <stdarg.h> | |
19 | #include <linux/config.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/threads.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/stringify.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/initrd.h> | |
30 | #include <linux/bitops.h> | |
31 | #include <linux/module.h> | |
dcee3036 | 32 | #include <linux/kexec.h> |
9b6b563c PM |
33 | |
34 | #include <asm/prom.h> | |
35 | #include <asm/rtas.h> | |
36 | #include <asm/lmb.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/processor.h> | |
39 | #include <asm/irq.h> | |
40 | #include <asm/io.h> | |
0cc4746c | 41 | #include <asm/kdump.h> |
9b6b563c PM |
42 | #include <asm/smp.h> |
43 | #include <asm/system.h> | |
44 | #include <asm/mmu.h> | |
45 | #include <asm/pgtable.h> | |
46 | #include <asm/pci.h> | |
47 | #include <asm/iommu.h> | |
48 | #include <asm/btext.h> | |
49 | #include <asm/sections.h> | |
50 | #include <asm/machdep.h> | |
51 | #include <asm/pSeries_reconfig.h> | |
40ef8cbc | 52 | #include <asm/pci-bridge.h> |
9b6b563c PM |
53 | |
54 | #ifdef DEBUG | |
55 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
56 | #else | |
57 | #define DBG(fmt...) | |
58 | #endif | |
59 | ||
9b6b563c | 60 | |
9b6b563c PM |
61 | static int __initdata dt_root_addr_cells; |
62 | static int __initdata dt_root_size_cells; | |
63 | ||
64 | #ifdef CONFIG_PPC64 | |
65 | static int __initdata iommu_is_off; | |
66 | int __initdata iommu_force_on; | |
cf00a8d1 | 67 | unsigned long tce_alloc_start, tce_alloc_end; |
9b6b563c PM |
68 | #endif |
69 | ||
70 | typedef u32 cell_t; | |
71 | ||
72 | #if 0 | |
73 | static struct boot_param_header *initial_boot_params __initdata; | |
74 | #else | |
75 | struct boot_param_header *initial_boot_params; | |
76 | #endif | |
77 | ||
78 | static struct device_node *allnodes = NULL; | |
79 | ||
80 | /* use when traversing tree through the allnext, child, sibling, | |
81 | * or parent members of struct device_node. | |
82 | */ | |
83 | static DEFINE_RWLOCK(devtree_lock); | |
84 | ||
85 | /* export that to outside world */ | |
86 | struct device_node *of_chosen; | |
87 | ||
88 | struct device_node *dflt_interrupt_controller; | |
89 | int num_interrupt_controllers; | |
90 | ||
9b6b563c PM |
91 | /* |
92 | * Wrapper for allocating memory for various data that needs to be | |
93 | * attached to device nodes as they are processed at boot or when | |
94 | * added to the device tree later (e.g. DLPAR). At boot there is | |
95 | * already a region reserved so we just increment *mem_start by size; | |
96 | * otherwise we call kmalloc. | |
97 | */ | |
98 | static void * prom_alloc(unsigned long size, unsigned long *mem_start) | |
99 | { | |
100 | unsigned long tmp; | |
101 | ||
102 | if (!mem_start) | |
103 | return kmalloc(size, GFP_KERNEL); | |
104 | ||
105 | tmp = *mem_start; | |
106 | *mem_start += size; | |
107 | return (void *)tmp; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Find the device_node with a given phandle. | |
112 | */ | |
113 | static struct device_node * find_phandle(phandle ph) | |
114 | { | |
115 | struct device_node *np; | |
116 | ||
117 | for (np = allnodes; np != 0; np = np->allnext) | |
118 | if (np->linux_phandle == ph) | |
119 | return np; | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Find the interrupt parent of a node. | |
125 | */ | |
126 | static struct device_node * __devinit intr_parent(struct device_node *p) | |
127 | { | |
128 | phandle *parp; | |
129 | ||
130 | parp = (phandle *) get_property(p, "interrupt-parent", NULL); | |
131 | if (parp == NULL) | |
132 | return p->parent; | |
133 | p = find_phandle(*parp); | |
134 | if (p != NULL) | |
135 | return p; | |
136 | /* | |
137 | * On a powermac booted with BootX, we don't get to know the | |
138 | * phandles for any nodes, so find_phandle will return NULL. | |
139 | * Fortunately these machines only have one interrupt controller | |
140 | * so there isn't in fact any ambiguity. -- paulus | |
141 | */ | |
142 | if (num_interrupt_controllers == 1) | |
143 | p = dflt_interrupt_controller; | |
144 | return p; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Find out the size of each entry of the interrupts property | |
149 | * for a node. | |
150 | */ | |
151 | int __devinit prom_n_intr_cells(struct device_node *np) | |
152 | { | |
153 | struct device_node *p; | |
154 | unsigned int *icp; | |
155 | ||
156 | for (p = np; (p = intr_parent(p)) != NULL; ) { | |
157 | icp = (unsigned int *) | |
158 | get_property(p, "#interrupt-cells", NULL); | |
159 | if (icp != NULL) | |
160 | return *icp; | |
161 | if (get_property(p, "interrupt-controller", NULL) != NULL | |
162 | || get_property(p, "interrupt-map", NULL) != NULL) { | |
163 | printk("oops, node %s doesn't have #interrupt-cells\n", | |
164 | p->full_name); | |
165 | return 1; | |
166 | } | |
167 | } | |
168 | #ifdef DEBUG_IRQ | |
169 | printk("prom_n_intr_cells failed for %s\n", np->full_name); | |
170 | #endif | |
171 | return 1; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Map an interrupt from a device up to the platform interrupt | |
176 | * descriptor. | |
177 | */ | |
178 | static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler, | |
179 | struct device_node *np, unsigned int *ints, | |
180 | int nintrc) | |
181 | { | |
182 | struct device_node *p, *ipar; | |
183 | unsigned int *imap, *imask, *ip; | |
184 | int i, imaplen, match; | |
185 | int newintrc = 0, newaddrc = 0; | |
186 | unsigned int *reg; | |
187 | int naddrc; | |
188 | ||
189 | reg = (unsigned int *) get_property(np, "reg", NULL); | |
190 | naddrc = prom_n_addr_cells(np); | |
191 | p = intr_parent(np); | |
192 | while (p != NULL) { | |
193 | if (get_property(p, "interrupt-controller", NULL) != NULL) | |
194 | /* this node is an interrupt controller, stop here */ | |
195 | break; | |
196 | imap = (unsigned int *) | |
197 | get_property(p, "interrupt-map", &imaplen); | |
198 | if (imap == NULL) { | |
199 | p = intr_parent(p); | |
200 | continue; | |
201 | } | |
202 | imask = (unsigned int *) | |
203 | get_property(p, "interrupt-map-mask", NULL); | |
204 | if (imask == NULL) { | |
205 | printk("oops, %s has interrupt-map but no mask\n", | |
206 | p->full_name); | |
207 | return 0; | |
208 | } | |
209 | imaplen /= sizeof(unsigned int); | |
210 | match = 0; | |
211 | ipar = NULL; | |
212 | while (imaplen > 0 && !match) { | |
213 | /* check the child-interrupt field */ | |
214 | match = 1; | |
215 | for (i = 0; i < naddrc && match; ++i) | |
216 | match = ((reg[i] ^ imap[i]) & imask[i]) == 0; | |
217 | for (; i < naddrc + nintrc && match; ++i) | |
218 | match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0; | |
219 | imap += naddrc + nintrc; | |
220 | imaplen -= naddrc + nintrc; | |
221 | /* grab the interrupt parent */ | |
222 | ipar = find_phandle((phandle) *imap++); | |
223 | --imaplen; | |
224 | if (ipar == NULL && num_interrupt_controllers == 1) | |
225 | /* cope with BootX not giving us phandles */ | |
226 | ipar = dflt_interrupt_controller; | |
227 | if (ipar == NULL) { | |
228 | printk("oops, no int parent %x in map of %s\n", | |
229 | imap[-1], p->full_name); | |
230 | return 0; | |
231 | } | |
232 | /* find the parent's # addr and intr cells */ | |
233 | ip = (unsigned int *) | |
234 | get_property(ipar, "#interrupt-cells", NULL); | |
235 | if (ip == NULL) { | |
236 | printk("oops, no #interrupt-cells on %s\n", | |
237 | ipar->full_name); | |
238 | return 0; | |
239 | } | |
240 | newintrc = *ip; | |
241 | ip = (unsigned int *) | |
242 | get_property(ipar, "#address-cells", NULL); | |
243 | newaddrc = (ip == NULL)? 0: *ip; | |
244 | imap += newaddrc + newintrc; | |
245 | imaplen -= newaddrc + newintrc; | |
246 | } | |
247 | if (imaplen < 0) { | |
248 | printk("oops, error decoding int-map on %s, len=%d\n", | |
249 | p->full_name, imaplen); | |
250 | return 0; | |
251 | } | |
252 | if (!match) { | |
253 | #ifdef DEBUG_IRQ | |
254 | printk("oops, no match in %s int-map for %s\n", | |
255 | p->full_name, np->full_name); | |
256 | #endif | |
257 | return 0; | |
258 | } | |
259 | p = ipar; | |
260 | naddrc = newaddrc; | |
261 | nintrc = newintrc; | |
262 | ints = imap - nintrc; | |
263 | reg = ints - naddrc; | |
264 | } | |
265 | if (p == NULL) { | |
266 | #ifdef DEBUG_IRQ | |
267 | printk("hmmm, int tree for %s doesn't have ctrler\n", | |
268 | np->full_name); | |
269 | #endif | |
270 | return 0; | |
271 | } | |
272 | *irq = ints; | |
273 | *ictrler = p; | |
274 | return nintrc; | |
275 | } | |
276 | ||
6d0124fc PM |
277 | static unsigned char map_isa_senses[4] = { |
278 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
279 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
280 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
281 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE | |
282 | }; | |
283 | ||
284 | static unsigned char map_mpic_senses[4] = { | |
285 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE, | |
286 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
287 | /* 2 seems to be used for the 8259 cascade... */ | |
288 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
289 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
290 | }; | |
291 | ||
9b6b563c PM |
292 | static int __devinit finish_node_interrupts(struct device_node *np, |
293 | unsigned long *mem_start, | |
294 | int measure_only) | |
295 | { | |
296 | unsigned int *ints; | |
297 | int intlen, intrcells, intrcount; | |
6d0124fc | 298 | int i, j, n, sense; |
9b6b563c PM |
299 | unsigned int *irq, virq; |
300 | struct device_node *ic; | |
1beb6a7d BH |
301 | int trace = 0; |
302 | ||
303 | //#define TRACE(fmt...) do { if (trace) { printk(fmt); mdelay(1000); } } while(0) | |
304 | #define TRACE(fmt...) | |
305 | ||
306 | if (!strcmp(np->name, "smu-doorbell")) | |
307 | trace = 1; | |
308 | ||
309 | TRACE("Finishing SMU doorbell ! num_interrupt_controllers = %d\n", | |
310 | num_interrupt_controllers); | |
9b6b563c | 311 | |
a575b807 PM |
312 | if (num_interrupt_controllers == 0) { |
313 | /* | |
314 | * Old machines just have a list of interrupt numbers | |
315 | * and no interrupt-controller nodes. | |
316 | */ | |
317 | ints = (unsigned int *) get_property(np, "AAPL,interrupts", | |
318 | &intlen); | |
319 | /* XXX old interpret_pci_props looked in parent too */ | |
320 | /* XXX old interpret_macio_props looked for interrupts | |
321 | before AAPL,interrupts */ | |
322 | if (ints == NULL) | |
323 | ints = (unsigned int *) get_property(np, "interrupts", | |
324 | &intlen); | |
325 | if (ints == NULL) | |
326 | return 0; | |
327 | ||
328 | np->n_intrs = intlen / sizeof(unsigned int); | |
329 | np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]), | |
330 | mem_start); | |
331 | if (!np->intrs) | |
332 | return -ENOMEM; | |
333 | if (measure_only) | |
334 | return 0; | |
335 | ||
336 | for (i = 0; i < np->n_intrs; ++i) { | |
337 | np->intrs[i].line = *ints++; | |
6d0124fc PM |
338 | np->intrs[i].sense = IRQ_SENSE_LEVEL |
339 | | IRQ_POLARITY_NEGATIVE; | |
a575b807 PM |
340 | } |
341 | return 0; | |
342 | } | |
343 | ||
9b6b563c | 344 | ints = (unsigned int *) get_property(np, "interrupts", &intlen); |
1beb6a7d | 345 | TRACE("ints=%p, intlen=%d\n", ints, intlen); |
9b6b563c PM |
346 | if (ints == NULL) |
347 | return 0; | |
348 | intrcells = prom_n_intr_cells(np); | |
349 | intlen /= intrcells * sizeof(unsigned int); | |
1beb6a7d | 350 | TRACE("intrcells=%d, new intlen=%d\n", intrcells, intlen); |
9b6b563c PM |
351 | np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start); |
352 | if (!np->intrs) | |
353 | return -ENOMEM; | |
354 | ||
355 | if (measure_only) | |
356 | return 0; | |
357 | ||
358 | intrcount = 0; | |
359 | for (i = 0; i < intlen; ++i, ints += intrcells) { | |
360 | n = map_interrupt(&irq, &ic, np, ints, intrcells); | |
1beb6a7d | 361 | TRACE("map, irq=%d, ic=%p, n=%d\n", irq, ic, n); |
9b6b563c PM |
362 | if (n <= 0) |
363 | continue; | |
364 | ||
365 | /* don't map IRQ numbers under a cascaded 8259 controller */ | |
366 | if (ic && device_is_compatible(ic, "chrp,iic")) { | |
367 | np->intrs[intrcount].line = irq[0]; | |
6d0124fc PM |
368 | sense = (n > 1)? (irq[1] & 3): 3; |
369 | np->intrs[intrcount].sense = map_isa_senses[sense]; | |
9b6b563c | 370 | } else { |
9b6b563c | 371 | virq = virt_irq_create_mapping(irq[0]); |
1beb6a7d | 372 | TRACE("virq=%d\n", virq); |
6d0124fc | 373 | #ifdef CONFIG_PPC64 |
9b6b563c PM |
374 | if (virq == NO_IRQ) { |
375 | printk(KERN_CRIT "Could not allocate interrupt" | |
376 | " number for %s\n", np->full_name); | |
377 | continue; | |
378 | } | |
9b6b563c | 379 | #endif |
6d0124fc PM |
380 | np->intrs[intrcount].line = irq_offset_up(virq); |
381 | sense = (n > 1)? (irq[1] & 3): 1; | |
1beb6a7d BH |
382 | |
383 | /* Apple uses bits in there in a different way, let's | |
384 | * only keep the real sense bit on macs | |
385 | */ | |
386 | if (_machine == PLATFORM_POWERMAC) | |
387 | sense &= 0x1; | |
6d0124fc | 388 | np->intrs[intrcount].sense = map_mpic_senses[sense]; |
9b6b563c PM |
389 | } |
390 | ||
391 | #ifdef CONFIG_PPC64 | |
392 | /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */ | |
799d6046 | 393 | if (_machine == PLATFORM_POWERMAC && ic && ic->parent) { |
9b6b563c PM |
394 | char *name = get_property(ic->parent, "name", NULL); |
395 | if (name && !strcmp(name, "u3")) | |
396 | np->intrs[intrcount].line += 128; | |
1beb6a7d BH |
397 | else if (!(name && (!strcmp(name, "mac-io") || |
398 | !strcmp(name, "u4")))) | |
9b6b563c PM |
399 | /* ignore other cascaded controllers, such as |
400 | the k2-sata-root */ | |
401 | break; | |
402 | } | |
1beb6a7d | 403 | #endif /* CONFIG_PPC64 */ |
9b6b563c PM |
404 | if (n > 2) { |
405 | printk("hmmm, got %d intr cells for %s:", n, | |
406 | np->full_name); | |
407 | for (j = 0; j < n; ++j) | |
408 | printk(" %d", irq[j]); | |
409 | printk("\n"); | |
410 | } | |
411 | ++intrcount; | |
412 | } | |
413 | np->n_intrs = intrcount; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
9b6b563c PM |
418 | static int __devinit finish_node(struct device_node *np, |
419 | unsigned long *mem_start, | |
9b6b563c PM |
420 | int measure_only) |
421 | { | |
422 | struct device_node *child; | |
cc5d0189 | 423 | int rc = 0; |
9b6b563c PM |
424 | |
425 | rc = finish_node_interrupts(np, mem_start, measure_only); | |
426 | if (rc) | |
427 | goto out; | |
428 | ||
9b6b563c | 429 | for (child = np->child; child != NULL; child = child->sibling) { |
cc5d0189 | 430 | rc = finish_node(child, mem_start, measure_only); |
9b6b563c PM |
431 | if (rc) |
432 | goto out; | |
433 | } | |
434 | out: | |
435 | return rc; | |
436 | } | |
437 | ||
438 | static void __init scan_interrupt_controllers(void) | |
439 | { | |
440 | struct device_node *np; | |
441 | int n = 0; | |
442 | char *name, *ic; | |
443 | int iclen; | |
444 | ||
445 | for (np = allnodes; np != NULL; np = np->allnext) { | |
446 | ic = get_property(np, "interrupt-controller", &iclen); | |
447 | name = get_property(np, "name", NULL); | |
448 | /* checking iclen makes sure we don't get a false | |
449 | match on /chosen.interrupt_controller */ | |
450 | if ((name != NULL | |
451 | && strcmp(name, "interrupt-controller") == 0) | |
452 | || (ic != NULL && iclen == 0 | |
453 | && strcmp(name, "AppleKiwi"))) { | |
454 | if (n == 0) | |
455 | dflt_interrupt_controller = np; | |
456 | ++n; | |
457 | } | |
458 | } | |
459 | num_interrupt_controllers = n; | |
460 | } | |
461 | ||
462 | /** | |
463 | * finish_device_tree is called once things are running normally | |
464 | * (i.e. with text and data mapped to the address they were linked at). | |
465 | * It traverses the device tree and fills in some of the additional, | |
466 | * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt | |
467 | * mapping is also initialized at this point. | |
468 | */ | |
469 | void __init finish_device_tree(void) | |
470 | { | |
471 | unsigned long start, end, size = 0; | |
472 | ||
473 | DBG(" -> finish_device_tree\n"); | |
474 | ||
475 | #ifdef CONFIG_PPC64 | |
476 | /* Initialize virtual IRQ map */ | |
477 | virt_irq_init(); | |
478 | #endif | |
479 | scan_interrupt_controllers(); | |
480 | ||
481 | /* | |
482 | * Finish device-tree (pre-parsing some properties etc...) | |
483 | * We do this in 2 passes. One with "measure_only" set, which | |
484 | * will only measure the amount of memory needed, then we can | |
485 | * allocate that memory, and call finish_node again. However, | |
486 | * we must be careful as most routines will fail nowadays when | |
487 | * prom_alloc() returns 0, so we must make sure our first pass | |
488 | * doesn't start at 0. We pre-initialize size to 16 for that | |
489 | * reason and then remove those additional 16 bytes | |
490 | */ | |
491 | size = 16; | |
cc5d0189 | 492 | finish_node(allnodes, &size, 1); |
9b6b563c PM |
493 | size -= 16; |
494 | end = start = (unsigned long) __va(lmb_alloc(size, 128)); | |
cc5d0189 | 495 | finish_node(allnodes, &end, 0); |
9b6b563c PM |
496 | BUG_ON(end != start + size); |
497 | ||
498 | DBG(" <- finish_device_tree\n"); | |
499 | } | |
500 | ||
501 | static inline char *find_flat_dt_string(u32 offset) | |
502 | { | |
503 | return ((char *)initial_boot_params) + | |
504 | initial_boot_params->off_dt_strings + offset; | |
505 | } | |
506 | ||
507 | /** | |
508 | * This function is used to scan the flattened device-tree, it is | |
509 | * used to extract the memory informations at boot before we can | |
510 | * unflatten the tree | |
511 | */ | |
3c726f8d BH |
512 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
513 | const char *uname, int depth, | |
514 | void *data), | |
515 | void *data) | |
9b6b563c PM |
516 | { |
517 | unsigned long p = ((unsigned long)initial_boot_params) + | |
518 | initial_boot_params->off_dt_struct; | |
519 | int rc = 0; | |
520 | int depth = -1; | |
521 | ||
522 | do { | |
523 | u32 tag = *((u32 *)p); | |
524 | char *pathp; | |
525 | ||
526 | p += 4; | |
527 | if (tag == OF_DT_END_NODE) { | |
528 | depth --; | |
529 | continue; | |
530 | } | |
531 | if (tag == OF_DT_NOP) | |
532 | continue; | |
533 | if (tag == OF_DT_END) | |
534 | break; | |
535 | if (tag == OF_DT_PROP) { | |
536 | u32 sz = *((u32 *)p); | |
537 | p += 8; | |
538 | if (initial_boot_params->version < 0x10) | |
539 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
540 | p += sz; | |
541 | p = _ALIGN(p, 4); | |
542 | continue; | |
543 | } | |
544 | if (tag != OF_DT_BEGIN_NODE) { | |
545 | printk(KERN_WARNING "Invalid tag %x scanning flattened" | |
546 | " device tree !\n", tag); | |
547 | return -EINVAL; | |
548 | } | |
549 | depth++; | |
550 | pathp = (char *)p; | |
551 | p = _ALIGN(p + strlen(pathp) + 1, 4); | |
552 | if ((*pathp) == '/') { | |
553 | char *lp, *np; | |
554 | for (lp = NULL, np = pathp; *np; np++) | |
555 | if ((*np) == '/') | |
556 | lp = np+1; | |
557 | if (lp != NULL) | |
558 | pathp = lp; | |
559 | } | |
560 | rc = it(p, pathp, depth, data); | |
561 | if (rc != 0) | |
562 | break; | |
563 | } while(1); | |
564 | ||
565 | return rc; | |
566 | } | |
567 | ||
568 | /** | |
569 | * This function can be used within scan_flattened_dt callback to get | |
570 | * access to properties | |
571 | */ | |
3c726f8d BH |
572 | void* __init of_get_flat_dt_prop(unsigned long node, const char *name, |
573 | unsigned long *size) | |
9b6b563c PM |
574 | { |
575 | unsigned long p = node; | |
576 | ||
577 | do { | |
578 | u32 tag = *((u32 *)p); | |
579 | u32 sz, noff; | |
580 | const char *nstr; | |
581 | ||
582 | p += 4; | |
583 | if (tag == OF_DT_NOP) | |
584 | continue; | |
585 | if (tag != OF_DT_PROP) | |
586 | return NULL; | |
587 | ||
588 | sz = *((u32 *)p); | |
589 | noff = *((u32 *)(p + 4)); | |
590 | p += 8; | |
591 | if (initial_boot_params->version < 0x10) | |
592 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
593 | ||
594 | nstr = find_flat_dt_string(noff); | |
595 | if (nstr == NULL) { | |
596 | printk(KERN_WARNING "Can't find property index" | |
597 | " name !\n"); | |
598 | return NULL; | |
599 | } | |
600 | if (strcmp(name, nstr) == 0) { | |
601 | if (size) | |
602 | *size = sz; | |
603 | return (void *)p; | |
604 | } | |
605 | p += sz; | |
606 | p = _ALIGN(p, 4); | |
607 | } while(1); | |
608 | } | |
609 | ||
610 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, | |
611 | unsigned long align) | |
612 | { | |
613 | void *res; | |
614 | ||
615 | *mem = _ALIGN(*mem, align); | |
616 | res = (void *)*mem; | |
617 | *mem += size; | |
618 | ||
619 | return res; | |
620 | } | |
621 | ||
622 | static unsigned long __init unflatten_dt_node(unsigned long mem, | |
623 | unsigned long *p, | |
624 | struct device_node *dad, | |
625 | struct device_node ***allnextpp, | |
626 | unsigned long fpsize) | |
627 | { | |
628 | struct device_node *np; | |
629 | struct property *pp, **prev_pp = NULL; | |
630 | char *pathp; | |
631 | u32 tag; | |
632 | unsigned int l, allocl; | |
633 | int has_name = 0; | |
634 | int new_format = 0; | |
635 | ||
636 | tag = *((u32 *)(*p)); | |
637 | if (tag != OF_DT_BEGIN_NODE) { | |
638 | printk("Weird tag at start of node: %x\n", tag); | |
639 | return mem; | |
640 | } | |
641 | *p += 4; | |
642 | pathp = (char *)*p; | |
643 | l = allocl = strlen(pathp) + 1; | |
644 | *p = _ALIGN(*p + l, 4); | |
645 | ||
646 | /* version 0x10 has a more compact unit name here instead of the full | |
647 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
648 | * it later. We detect this because the first character of the name is | |
649 | * not '/'. | |
650 | */ | |
651 | if ((*pathp) != '/') { | |
652 | new_format = 1; | |
653 | if (fpsize == 0) { | |
654 | /* root node: special case. fpsize accounts for path | |
655 | * plus terminating zero. root node only has '/', so | |
656 | * fpsize should be 2, but we want to avoid the first | |
657 | * level nodes to have two '/' so we use fpsize 1 here | |
658 | */ | |
659 | fpsize = 1; | |
660 | allocl = 2; | |
661 | } else { | |
662 | /* account for '/' and path size minus terminal 0 | |
663 | * already in 'l' | |
664 | */ | |
665 | fpsize += l; | |
666 | allocl = fpsize; | |
667 | } | |
668 | } | |
669 | ||
670 | ||
671 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
672 | __alignof__(struct device_node)); | |
673 | if (allnextpp) { | |
674 | memset(np, 0, sizeof(*np)); | |
675 | np->full_name = ((char*)np) + sizeof(struct device_node); | |
676 | if (new_format) { | |
677 | char *p = np->full_name; | |
678 | /* rebuild full path for new format */ | |
679 | if (dad && dad->parent) { | |
680 | strcpy(p, dad->full_name); | |
681 | #ifdef DEBUG | |
682 | if ((strlen(p) + l + 1) != allocl) { | |
683 | DBG("%s: p: %d, l: %d, a: %d\n", | |
684 | pathp, strlen(p), l, allocl); | |
685 | } | |
686 | #endif | |
687 | p += strlen(p); | |
688 | } | |
689 | *(p++) = '/'; | |
690 | memcpy(p, pathp, l); | |
691 | } else | |
692 | memcpy(np->full_name, pathp, l); | |
693 | prev_pp = &np->properties; | |
694 | **allnextpp = np; | |
695 | *allnextpp = &np->allnext; | |
696 | if (dad != NULL) { | |
697 | np->parent = dad; | |
698 | /* we temporarily use the next field as `last_child'*/ | |
699 | if (dad->next == 0) | |
700 | dad->child = np; | |
701 | else | |
702 | dad->next->sibling = np; | |
703 | dad->next = np; | |
704 | } | |
705 | kref_init(&np->kref); | |
706 | } | |
707 | while(1) { | |
708 | u32 sz, noff; | |
709 | char *pname; | |
710 | ||
711 | tag = *((u32 *)(*p)); | |
712 | if (tag == OF_DT_NOP) { | |
713 | *p += 4; | |
714 | continue; | |
715 | } | |
716 | if (tag != OF_DT_PROP) | |
717 | break; | |
718 | *p += 4; | |
719 | sz = *((u32 *)(*p)); | |
720 | noff = *((u32 *)((*p) + 4)); | |
721 | *p += 8; | |
722 | if (initial_boot_params->version < 0x10) | |
723 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); | |
724 | ||
725 | pname = find_flat_dt_string(noff); | |
726 | if (pname == NULL) { | |
727 | printk("Can't find property name in list !\n"); | |
728 | break; | |
729 | } | |
730 | if (strcmp(pname, "name") == 0) | |
731 | has_name = 1; | |
732 | l = strlen(pname) + 1; | |
733 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
734 | __alignof__(struct property)); | |
735 | if (allnextpp) { | |
736 | if (strcmp(pname, "linux,phandle") == 0) { | |
737 | np->node = *((u32 *)*p); | |
738 | if (np->linux_phandle == 0) | |
739 | np->linux_phandle = np->node; | |
740 | } | |
741 | if (strcmp(pname, "ibm,phandle") == 0) | |
742 | np->linux_phandle = *((u32 *)*p); | |
743 | pp->name = pname; | |
744 | pp->length = sz; | |
745 | pp->value = (void *)*p; | |
746 | *prev_pp = pp; | |
747 | prev_pp = &pp->next; | |
748 | } | |
749 | *p = _ALIGN((*p) + sz, 4); | |
750 | } | |
751 | /* with version 0x10 we may not have the name property, recreate | |
752 | * it here from the unit name if absent | |
753 | */ | |
754 | if (!has_name) { | |
755 | char *p = pathp, *ps = pathp, *pa = NULL; | |
756 | int sz; | |
757 | ||
758 | while (*p) { | |
759 | if ((*p) == '@') | |
760 | pa = p; | |
761 | if ((*p) == '/') | |
762 | ps = p + 1; | |
763 | p++; | |
764 | } | |
765 | if (pa < ps) | |
766 | pa = p; | |
767 | sz = (pa - ps) + 1; | |
768 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
769 | __alignof__(struct property)); | |
770 | if (allnextpp) { | |
771 | pp->name = "name"; | |
772 | pp->length = sz; | |
773 | pp->value = (unsigned char *)(pp + 1); | |
774 | *prev_pp = pp; | |
775 | prev_pp = &pp->next; | |
776 | memcpy(pp->value, ps, sz - 1); | |
777 | ((char *)pp->value)[sz - 1] = 0; | |
778 | DBG("fixed up name for %s -> %s\n", pathp, pp->value); | |
779 | } | |
780 | } | |
781 | if (allnextpp) { | |
782 | *prev_pp = NULL; | |
783 | np->name = get_property(np, "name", NULL); | |
784 | np->type = get_property(np, "device_type", NULL); | |
785 | ||
786 | if (!np->name) | |
787 | np->name = "<NULL>"; | |
788 | if (!np->type) | |
789 | np->type = "<NULL>"; | |
790 | } | |
791 | while (tag == OF_DT_BEGIN_NODE) { | |
792 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
793 | tag = *((u32 *)(*p)); | |
794 | } | |
795 | if (tag != OF_DT_END_NODE) { | |
796 | printk("Weird tag at end of node: %x\n", tag); | |
797 | return mem; | |
798 | } | |
799 | *p += 4; | |
800 | return mem; | |
801 | } | |
802 | ||
803 | ||
804 | /** | |
805 | * unflattens the device-tree passed by the firmware, creating the | |
806 | * tree of struct device_node. It also fills the "name" and "type" | |
807 | * pointers of the nodes so the normal device-tree walking functions | |
808 | * can be used (this used to be done by finish_device_tree) | |
809 | */ | |
810 | void __init unflatten_device_tree(void) | |
811 | { | |
812 | unsigned long start, mem, size; | |
813 | struct device_node **allnextp = &allnodes; | |
814 | char *p = NULL; | |
815 | int l = 0; | |
816 | ||
817 | DBG(" -> unflatten_device_tree()\n"); | |
818 | ||
819 | /* First pass, scan for size */ | |
820 | start = ((unsigned long)initial_boot_params) + | |
821 | initial_boot_params->off_dt_struct; | |
822 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); | |
823 | size = (size | 3) + 1; | |
824 | ||
825 | DBG(" size is %lx, allocating...\n", size); | |
826 | ||
827 | /* Allocate memory for the expanded device tree */ | |
828 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); | |
829 | if (!mem) { | |
830 | DBG("Couldn't allocate memory with lmb_alloc()!\n"); | |
831 | panic("Couldn't allocate memory with lmb_alloc()!\n"); | |
832 | } | |
833 | mem = (unsigned long) __va(mem); | |
834 | ||
835 | ((u32 *)mem)[size / 4] = 0xdeadbeef; | |
836 | ||
837 | DBG(" unflattening %lx...\n", mem); | |
838 | ||
839 | /* Second pass, do actual unflattening */ | |
840 | start = ((unsigned long)initial_boot_params) + | |
841 | initial_boot_params->off_dt_struct; | |
842 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); | |
843 | if (*((u32 *)start) != OF_DT_END) | |
844 | printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); | |
845 | if (((u32 *)mem)[size / 4] != 0xdeadbeef) | |
846 | printk(KERN_WARNING "End of tree marker overwritten: %08x\n", | |
847 | ((u32 *)mem)[size / 4] ); | |
848 | *allnextp = NULL; | |
849 | ||
850 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
851 | of_chosen = of_find_node_by_path("/chosen"); | |
a575b807 PM |
852 | if (of_chosen == NULL) |
853 | of_chosen = of_find_node_by_path("/chosen@0"); | |
9b6b563c PM |
854 | |
855 | /* Retreive command line */ | |
856 | if (of_chosen != NULL) { | |
857 | p = (char *)get_property(of_chosen, "bootargs", &l); | |
858 | if (p != NULL && l > 0) | |
859 | strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE)); | |
860 | } | |
861 | #ifdef CONFIG_CMDLINE | |
862 | if (l == 0 || (l == 1 && (*p) == 0)) | |
863 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
864 | #endif /* CONFIG_CMDLINE */ | |
865 | ||
866 | DBG("Command line is: %s\n", cmd_line); | |
867 | ||
868 | DBG(" <- unflatten_device_tree()\n"); | |
869 | } | |
870 | ||
871 | ||
872 | static int __init early_init_dt_scan_cpus(unsigned long node, | |
873 | const char *uname, int depth, void *data) | |
874 | { | |
9b6b563c | 875 | u32 *prop; |
676e2497 SR |
876 | unsigned long size; |
877 | char *type = of_get_flat_dt_prop(node, "device_type", &size); | |
9b6b563c PM |
878 | |
879 | /* We are scanning "cpu" nodes only */ | |
880 | if (type == NULL || strcmp(type, "cpu") != 0) | |
881 | return 0; | |
882 | ||
80579e1f PM |
883 | boot_cpuid = 0; |
884 | boot_cpuid_phys = 0; | |
9b6b563c PM |
885 | if (initial_boot_params && initial_boot_params->version >= 2) { |
886 | /* version 2 of the kexec param format adds the phys cpuid | |
887 | * of booted proc. | |
888 | */ | |
889 | boot_cpuid_phys = initial_boot_params->boot_cpuid_phys; | |
9b6b563c | 890 | } else { |
80579e1f | 891 | /* Check if it's the boot-cpu, set it's hw index now */ |
3c726f8d BH |
892 | if (of_get_flat_dt_prop(node, |
893 | "linux,boot-cpu", NULL) != NULL) { | |
894 | prop = of_get_flat_dt_prop(node, "reg", NULL); | |
80579e1f PM |
895 | if (prop != NULL) |
896 | boot_cpuid_phys = *prop; | |
9b6b563c PM |
897 | } |
898 | } | |
80579e1f | 899 | set_hard_smp_processor_id(0, boot_cpuid_phys); |
9b6b563c PM |
900 | |
901 | #ifdef CONFIG_ALTIVEC | |
902 | /* Check if we have a VMX and eventually update CPU features */ | |
676e2497 | 903 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,vmx", NULL); |
9b6b563c PM |
904 | if (prop && (*prop) > 0) { |
905 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
906 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
907 | } | |
908 | ||
909 | /* Same goes for Apple's "altivec" property */ | |
3c726f8d | 910 | prop = (u32 *)of_get_flat_dt_prop(node, "altivec", NULL); |
9b6b563c PM |
911 | if (prop) { |
912 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
913 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
914 | } | |
915 | #endif /* CONFIG_ALTIVEC */ | |
916 | ||
917 | #ifdef CONFIG_PPC_PSERIES | |
918 | /* | |
919 | * Check for an SMT capable CPU and set the CPU feature. We do | |
920 | * this by looking at the size of the ibm,ppc-interrupt-server#s | |
921 | * property | |
922 | */ | |
3c726f8d | 923 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", |
9b6b563c PM |
924 | &size); |
925 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
926 | if (prop && ((size / sizeof(u32)) > 1)) | |
927 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; | |
928 | #endif | |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | static int __init early_init_dt_scan_chosen(unsigned long node, | |
934 | const char *uname, int depth, void *data) | |
935 | { | |
936 | u32 *prop; | |
937 | unsigned long *lprop; | |
938 | ||
939 | DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
940 | ||
a575b807 PM |
941 | if (depth != 1 || |
942 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
9b6b563c PM |
943 | return 0; |
944 | ||
945 | /* get platform type */ | |
3c726f8d | 946 | prop = (u32 *)of_get_flat_dt_prop(node, "linux,platform", NULL); |
9b6b563c PM |
947 | if (prop == NULL) |
948 | return 0; | |
60dda256 | 949 | #ifdef CONFIG_PPC_MULTIPLATFORM |
9b6b563c PM |
950 | _machine = *prop; |
951 | #endif | |
952 | ||
953 | #ifdef CONFIG_PPC64 | |
954 | /* check if iommu is forced on or off */ | |
3c726f8d | 955 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 956 | iommu_is_off = 1; |
3c726f8d | 957 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
958 | iommu_force_on = 1; |
959 | #endif | |
960 | ||
3c726f8d | 961 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
9b6b563c PM |
962 | if (lprop) |
963 | memory_limit = *lprop; | |
964 | ||
965 | #ifdef CONFIG_PPC64 | |
3c726f8d | 966 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
9b6b563c PM |
967 | if (lprop) |
968 | tce_alloc_start = *lprop; | |
3c726f8d | 969 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
9b6b563c PM |
970 | if (lprop) |
971 | tce_alloc_end = *lprop; | |
972 | #endif | |
973 | ||
974 | #ifdef CONFIG_PPC_RTAS | |
943ffb58 | 975 | /* To help early debugging via the front panel, we retrieve a minimal |
9b6b563c PM |
976 | * set of RTAS infos now if available |
977 | */ | |
978 | { | |
979 | u64 *basep, *entryp; | |
980 | ||
3c726f8d BH |
981 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
982 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
983 | prop = of_get_flat_dt_prop(node, "linux,rtas-size", NULL); | |
9b6b563c PM |
984 | if (basep && entryp && prop) { |
985 | rtas.base = *basep; | |
986 | rtas.entry = *entryp; | |
987 | rtas.size = *prop; | |
988 | } | |
989 | } | |
990 | #endif /* CONFIG_PPC_RTAS */ | |
991 | ||
dcee3036 ME |
992 | #ifdef CONFIG_KEXEC |
993 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); | |
994 | if (lprop) | |
995 | crashk_res.start = *lprop; | |
996 | ||
997 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); | |
998 | if (lprop) | |
999 | crashk_res.end = crashk_res.start + *lprop - 1; | |
1000 | #endif | |
1001 | ||
9b6b563c PM |
1002 | /* break now */ |
1003 | return 1; | |
1004 | } | |
1005 | ||
1006 | static int __init early_init_dt_scan_root(unsigned long node, | |
1007 | const char *uname, int depth, void *data) | |
1008 | { | |
1009 | u32 *prop; | |
1010 | ||
1011 | if (depth != 0) | |
1012 | return 0; | |
1013 | ||
3c726f8d | 1014 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
9b6b563c PM |
1015 | dt_root_size_cells = (prop == NULL) ? 1 : *prop; |
1016 | DBG("dt_root_size_cells = %x\n", dt_root_size_cells); | |
1017 | ||
3c726f8d | 1018 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
9b6b563c PM |
1019 | dt_root_addr_cells = (prop == NULL) ? 2 : *prop; |
1020 | DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); | |
1021 | ||
1022 | /* break now */ | |
1023 | return 1; | |
1024 | } | |
1025 | ||
1026 | static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) | |
1027 | { | |
1028 | cell_t *p = *cellp; | |
1029 | unsigned long r; | |
1030 | ||
1031 | /* Ignore more than 2 cells */ | |
1032 | while (s > sizeof(unsigned long) / 4) { | |
1033 | p++; | |
1034 | s--; | |
1035 | } | |
1036 | r = *p++; | |
1037 | #ifdef CONFIG_PPC64 | |
1038 | if (s > 1) { | |
1039 | r <<= 32; | |
1040 | r |= *(p++); | |
1041 | s--; | |
1042 | } | |
1043 | #endif | |
1044 | ||
1045 | *cellp = p; | |
1046 | return r; | |
1047 | } | |
1048 | ||
1049 | ||
1050 | static int __init early_init_dt_scan_memory(unsigned long node, | |
1051 | const char *uname, int depth, void *data) | |
1052 | { | |
3c726f8d | 1053 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
9b6b563c PM |
1054 | cell_t *reg, *endp; |
1055 | unsigned long l; | |
1056 | ||
1057 | /* We are scanning "memory" nodes only */ | |
a23414be PM |
1058 | if (type == NULL) { |
1059 | /* | |
1060 | * The longtrail doesn't have a device_type on the | |
1061 | * /memory node, so look for the node called /memory@0. | |
1062 | */ | |
1063 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
1064 | return 0; | |
1065 | } else if (strcmp(type, "memory") != 0) | |
9b6b563c PM |
1066 | return 0; |
1067 | ||
ba759485 ME |
1068 | reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
1069 | if (reg == NULL) | |
1070 | reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); | |
9b6b563c PM |
1071 | if (reg == NULL) |
1072 | return 0; | |
1073 | ||
1074 | endp = reg + (l / sizeof(cell_t)); | |
1075 | ||
358c86fd | 1076 | DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
9b6b563c PM |
1077 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
1078 | ||
1079 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1080 | unsigned long base, size; | |
1081 | ||
1082 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1083 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1084 | ||
1085 | if (size == 0) | |
1086 | continue; | |
1087 | DBG(" - %lx , %lx\n", base, size); | |
1088 | #ifdef CONFIG_PPC64 | |
1089 | if (iommu_is_off) { | |
1090 | if (base >= 0x80000000ul) | |
1091 | continue; | |
1092 | if ((base + size) > 0x80000000ul) | |
1093 | size = 0x80000000ul - base; | |
1094 | } | |
1095 | #endif | |
1096 | lmb_add(base, size); | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static void __init early_reserve_mem(void) | |
1102 | { | |
1103 | unsigned long base, size; | |
1104 | unsigned long *reserve_map; | |
1105 | ||
1106 | reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) + | |
1107 | initial_boot_params->off_mem_rsvmap); | |
1108 | while (1) { | |
1109 | base = *(reserve_map++); | |
1110 | size = *(reserve_map++); | |
1111 | if (size == 0) | |
1112 | break; | |
1113 | DBG("reserving: %lx -> %lx\n", base, size); | |
1114 | lmb_reserve(base, size); | |
1115 | } | |
1116 | ||
1117 | #if 0 | |
1118 | DBG("memory reserved, lmbs :\n"); | |
1119 | lmb_dump_all(); | |
1120 | #endif | |
1121 | } | |
1122 | ||
1123 | void __init early_init_devtree(void *params) | |
1124 | { | |
1125 | DBG(" -> early_init_devtree()\n"); | |
1126 | ||
1127 | /* Setup flat device-tree pointer */ | |
1128 | initial_boot_params = params; | |
1129 | ||
1130 | /* Retrieve various informations from the /chosen node of the | |
1131 | * device-tree, including the platform type, initrd location and | |
1132 | * size, TCE reserve, and more ... | |
1133 | */ | |
3c726f8d | 1134 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
9b6b563c PM |
1135 | |
1136 | /* Scan memory nodes and rebuild LMBs */ | |
1137 | lmb_init(); | |
3c726f8d BH |
1138 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
1139 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
9b6b563c PM |
1140 | lmb_enforce_memory_limit(memory_limit); |
1141 | lmb_analyze(); | |
9b6b563c PM |
1142 | |
1143 | DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); | |
1144 | ||
1145 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ | |
0cc4746c ME |
1146 | lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); |
1147 | #ifdef CONFIG_CRASH_DUMP | |
1148 | lmb_reserve(0, KDUMP_RESERVE_LIMIT); | |
1149 | #endif | |
9b6b563c PM |
1150 | early_reserve_mem(); |
1151 | ||
1152 | DBG("Scanning CPUs ...\n"); | |
1153 | ||
3c726f8d BH |
1154 | /* Retreive CPU related informations from the flat tree |
1155 | * (altivec support, boot CPU ID, ...) | |
9b6b563c | 1156 | */ |
3c726f8d | 1157 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
9b6b563c | 1158 | |
9b6b563c PM |
1159 | DBG(" <- early_init_devtree()\n"); |
1160 | } | |
1161 | ||
1162 | #undef printk | |
1163 | ||
1164 | int | |
1165 | prom_n_addr_cells(struct device_node* np) | |
1166 | { | |
1167 | int* ip; | |
1168 | do { | |
1169 | if (np->parent) | |
1170 | np = np->parent; | |
1171 | ip = (int *) get_property(np, "#address-cells", NULL); | |
1172 | if (ip != NULL) | |
1173 | return *ip; | |
1174 | } while (np->parent); | |
1175 | /* No #address-cells property for the root node, default to 1 */ | |
1176 | return 1; | |
1177 | } | |
1dfc6772 | 1178 | EXPORT_SYMBOL(prom_n_addr_cells); |
9b6b563c PM |
1179 | |
1180 | int | |
1181 | prom_n_size_cells(struct device_node* np) | |
1182 | { | |
1183 | int* ip; | |
1184 | do { | |
1185 | if (np->parent) | |
1186 | np = np->parent; | |
1187 | ip = (int *) get_property(np, "#size-cells", NULL); | |
1188 | if (ip != NULL) | |
1189 | return *ip; | |
1190 | } while (np->parent); | |
1191 | /* No #size-cells property for the root node, default to 1 */ | |
1192 | return 1; | |
1193 | } | |
1dfc6772 | 1194 | EXPORT_SYMBOL(prom_n_size_cells); |
9b6b563c PM |
1195 | |
1196 | /** | |
1197 | * Work out the sense (active-low level / active-high edge) | |
1198 | * of each interrupt from the device tree. | |
1199 | */ | |
1200 | void __init prom_get_irq_senses(unsigned char *senses, int off, int max) | |
1201 | { | |
1202 | struct device_node *np; | |
1203 | int i, j; | |
1204 | ||
1205 | /* default to level-triggered */ | |
6d0124fc | 1206 | memset(senses, IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, max - off); |
9b6b563c PM |
1207 | |
1208 | for (np = allnodes; np != 0; np = np->allnext) { | |
1209 | for (j = 0; j < np->n_intrs; j++) { | |
1210 | i = np->intrs[j].line; | |
1211 | if (i >= off && i < max) | |
6d0124fc | 1212 | senses[i-off] = np->intrs[j].sense; |
9b6b563c PM |
1213 | } |
1214 | } | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * Construct and return a list of the device_nodes with a given name. | |
1219 | */ | |
1220 | struct device_node *find_devices(const char *name) | |
1221 | { | |
1222 | struct device_node *head, **prevp, *np; | |
1223 | ||
1224 | prevp = &head; | |
1225 | for (np = allnodes; np != 0; np = np->allnext) { | |
1226 | if (np->name != 0 && strcasecmp(np->name, name) == 0) { | |
1227 | *prevp = np; | |
1228 | prevp = &np->next; | |
1229 | } | |
1230 | } | |
1231 | *prevp = NULL; | |
1232 | return head; | |
1233 | } | |
1234 | EXPORT_SYMBOL(find_devices); | |
1235 | ||
1236 | /** | |
1237 | * Construct and return a list of the device_nodes with a given type. | |
1238 | */ | |
1239 | struct device_node *find_type_devices(const char *type) | |
1240 | { | |
1241 | struct device_node *head, **prevp, *np; | |
1242 | ||
1243 | prevp = &head; | |
1244 | for (np = allnodes; np != 0; np = np->allnext) { | |
1245 | if (np->type != 0 && strcasecmp(np->type, type) == 0) { | |
1246 | *prevp = np; | |
1247 | prevp = &np->next; | |
1248 | } | |
1249 | } | |
1250 | *prevp = NULL; | |
1251 | return head; | |
1252 | } | |
1253 | EXPORT_SYMBOL(find_type_devices); | |
1254 | ||
1255 | /** | |
1256 | * Returns all nodes linked together | |
1257 | */ | |
1258 | struct device_node *find_all_nodes(void) | |
1259 | { | |
1260 | struct device_node *head, **prevp, *np; | |
1261 | ||
1262 | prevp = &head; | |
1263 | for (np = allnodes; np != 0; np = np->allnext) { | |
1264 | *prevp = np; | |
1265 | prevp = &np->next; | |
1266 | } | |
1267 | *prevp = NULL; | |
1268 | return head; | |
1269 | } | |
1270 | EXPORT_SYMBOL(find_all_nodes); | |
1271 | ||
1272 | /** Checks if the given "compat" string matches one of the strings in | |
1273 | * the device's "compatible" property | |
1274 | */ | |
1275 | int device_is_compatible(struct device_node *device, const char *compat) | |
1276 | { | |
1277 | const char* cp; | |
1278 | int cplen, l; | |
1279 | ||
1280 | cp = (char *) get_property(device, "compatible", &cplen); | |
1281 | if (cp == NULL) | |
1282 | return 0; | |
1283 | while (cplen > 0) { | |
1284 | if (strncasecmp(cp, compat, strlen(compat)) == 0) | |
1285 | return 1; | |
1286 | l = strlen(cp) + 1; | |
1287 | cp += l; | |
1288 | cplen -= l; | |
1289 | } | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | EXPORT_SYMBOL(device_is_compatible); | |
1294 | ||
1295 | ||
1296 | /** | |
1297 | * Indicates whether the root node has a given value in its | |
1298 | * compatible property. | |
1299 | */ | |
1300 | int machine_is_compatible(const char *compat) | |
1301 | { | |
1302 | struct device_node *root; | |
1303 | int rc = 0; | |
1304 | ||
1305 | root = of_find_node_by_path("/"); | |
1306 | if (root) { | |
1307 | rc = device_is_compatible(root, compat); | |
1308 | of_node_put(root); | |
1309 | } | |
1310 | return rc; | |
1311 | } | |
1312 | EXPORT_SYMBOL(machine_is_compatible); | |
1313 | ||
1314 | /** | |
1315 | * Construct and return a list of the device_nodes with a given type | |
1316 | * and compatible property. | |
1317 | */ | |
1318 | struct device_node *find_compatible_devices(const char *type, | |
1319 | const char *compat) | |
1320 | { | |
1321 | struct device_node *head, **prevp, *np; | |
1322 | ||
1323 | prevp = &head; | |
1324 | for (np = allnodes; np != 0; np = np->allnext) { | |
1325 | if (type != NULL | |
1326 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) | |
1327 | continue; | |
1328 | if (device_is_compatible(np, compat)) { | |
1329 | *prevp = np; | |
1330 | prevp = &np->next; | |
1331 | } | |
1332 | } | |
1333 | *prevp = NULL; | |
1334 | return head; | |
1335 | } | |
1336 | EXPORT_SYMBOL(find_compatible_devices); | |
1337 | ||
1338 | /** | |
1339 | * Find the device_node with a given full_name. | |
1340 | */ | |
1341 | struct device_node *find_path_device(const char *path) | |
1342 | { | |
1343 | struct device_node *np; | |
1344 | ||
1345 | for (np = allnodes; np != 0; np = np->allnext) | |
1346 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0) | |
1347 | return np; | |
1348 | return NULL; | |
1349 | } | |
1350 | EXPORT_SYMBOL(find_path_device); | |
1351 | ||
1352 | /******* | |
1353 | * | |
1354 | * New implementation of the OF "find" APIs, return a refcounted | |
1355 | * object, call of_node_put() when done. The device tree and list | |
1356 | * are protected by a rw_lock. | |
1357 | * | |
1358 | * Note that property management will need some locking as well, | |
1359 | * this isn't dealt with yet. | |
1360 | * | |
1361 | *******/ | |
1362 | ||
1363 | /** | |
1364 | * of_find_node_by_name - Find a node by its "name" property | |
1365 | * @from: The node to start searching from or NULL, the node | |
1366 | * you pass will not be searched, only the next one | |
1367 | * will; typically, you pass what the previous call | |
1368 | * returned. of_node_put() will be called on it | |
1369 | * @name: The name string to match against | |
1370 | * | |
1371 | * Returns a node pointer with refcount incremented, use | |
1372 | * of_node_put() on it when done. | |
1373 | */ | |
1374 | struct device_node *of_find_node_by_name(struct device_node *from, | |
1375 | const char *name) | |
1376 | { | |
1377 | struct device_node *np; | |
1378 | ||
1379 | read_lock(&devtree_lock); | |
1380 | np = from ? from->allnext : allnodes; | |
1381 | for (; np != 0; np = np->allnext) | |
1382 | if (np->name != 0 && strcasecmp(np->name, name) == 0 | |
1383 | && of_node_get(np)) | |
1384 | break; | |
1385 | if (from) | |
1386 | of_node_put(from); | |
1387 | read_unlock(&devtree_lock); | |
1388 | return np; | |
1389 | } | |
1390 | EXPORT_SYMBOL(of_find_node_by_name); | |
1391 | ||
1392 | /** | |
1393 | * of_find_node_by_type - Find a node by its "device_type" property | |
1394 | * @from: The node to start searching from or NULL, the node | |
1395 | * you pass will not be searched, only the next one | |
1396 | * will; typically, you pass what the previous call | |
1397 | * returned. of_node_put() will be called on it | |
1398 | * @name: The type string to match against | |
1399 | * | |
1400 | * Returns a node pointer with refcount incremented, use | |
1401 | * of_node_put() on it when done. | |
1402 | */ | |
1403 | struct device_node *of_find_node_by_type(struct device_node *from, | |
1404 | const char *type) | |
1405 | { | |
1406 | struct device_node *np; | |
1407 | ||
1408 | read_lock(&devtree_lock); | |
1409 | np = from ? from->allnext : allnodes; | |
1410 | for (; np != 0; np = np->allnext) | |
1411 | if (np->type != 0 && strcasecmp(np->type, type) == 0 | |
1412 | && of_node_get(np)) | |
1413 | break; | |
1414 | if (from) | |
1415 | of_node_put(from); | |
1416 | read_unlock(&devtree_lock); | |
1417 | return np; | |
1418 | } | |
1419 | EXPORT_SYMBOL(of_find_node_by_type); | |
1420 | ||
1421 | /** | |
1422 | * of_find_compatible_node - Find a node based on type and one of the | |
1423 | * tokens in its "compatible" property | |
1424 | * @from: The node to start searching from or NULL, the node | |
1425 | * you pass will not be searched, only the next one | |
1426 | * will; typically, you pass what the previous call | |
1427 | * returned. of_node_put() will be called on it | |
1428 | * @type: The type string to match "device_type" or NULL to ignore | |
1429 | * @compatible: The string to match to one of the tokens in the device | |
1430 | * "compatible" list. | |
1431 | * | |
1432 | * Returns a node pointer with refcount incremented, use | |
1433 | * of_node_put() on it when done. | |
1434 | */ | |
1435 | struct device_node *of_find_compatible_node(struct device_node *from, | |
1436 | const char *type, const char *compatible) | |
1437 | { | |
1438 | struct device_node *np; | |
1439 | ||
1440 | read_lock(&devtree_lock); | |
1441 | np = from ? from->allnext : allnodes; | |
1442 | for (; np != 0; np = np->allnext) { | |
1443 | if (type != NULL | |
1444 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) | |
1445 | continue; | |
1446 | if (device_is_compatible(np, compatible) && of_node_get(np)) | |
1447 | break; | |
1448 | } | |
1449 | if (from) | |
1450 | of_node_put(from); | |
1451 | read_unlock(&devtree_lock); | |
1452 | return np; | |
1453 | } | |
1454 | EXPORT_SYMBOL(of_find_compatible_node); | |
1455 | ||
1456 | /** | |
1457 | * of_find_node_by_path - Find a node matching a full OF path | |
1458 | * @path: The full path to match | |
1459 | * | |
1460 | * Returns a node pointer with refcount incremented, use | |
1461 | * of_node_put() on it when done. | |
1462 | */ | |
1463 | struct device_node *of_find_node_by_path(const char *path) | |
1464 | { | |
1465 | struct device_node *np = allnodes; | |
1466 | ||
1467 | read_lock(&devtree_lock); | |
1468 | for (; np != 0; np = np->allnext) { | |
1469 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0 | |
1470 | && of_node_get(np)) | |
1471 | break; | |
1472 | } | |
1473 | read_unlock(&devtree_lock); | |
1474 | return np; | |
1475 | } | |
1476 | EXPORT_SYMBOL(of_find_node_by_path); | |
1477 | ||
1478 | /** | |
1479 | * of_find_node_by_phandle - Find a node given a phandle | |
1480 | * @handle: phandle of the node to find | |
1481 | * | |
1482 | * Returns a node pointer with refcount incremented, use | |
1483 | * of_node_put() on it when done. | |
1484 | */ | |
1485 | struct device_node *of_find_node_by_phandle(phandle handle) | |
1486 | { | |
1487 | struct device_node *np; | |
1488 | ||
1489 | read_lock(&devtree_lock); | |
1490 | for (np = allnodes; np != 0; np = np->allnext) | |
1491 | if (np->linux_phandle == handle) | |
1492 | break; | |
1493 | if (np) | |
1494 | of_node_get(np); | |
1495 | read_unlock(&devtree_lock); | |
1496 | return np; | |
1497 | } | |
1498 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
1499 | ||
1500 | /** | |
1501 | * of_find_all_nodes - Get next node in global list | |
1502 | * @prev: Previous node or NULL to start iteration | |
1503 | * of_node_put() will be called on it | |
1504 | * | |
1505 | * Returns a node pointer with refcount incremented, use | |
1506 | * of_node_put() on it when done. | |
1507 | */ | |
1508 | struct device_node *of_find_all_nodes(struct device_node *prev) | |
1509 | { | |
1510 | struct device_node *np; | |
1511 | ||
1512 | read_lock(&devtree_lock); | |
1513 | np = prev ? prev->allnext : allnodes; | |
1514 | for (; np != 0; np = np->allnext) | |
1515 | if (of_node_get(np)) | |
1516 | break; | |
1517 | if (prev) | |
1518 | of_node_put(prev); | |
1519 | read_unlock(&devtree_lock); | |
1520 | return np; | |
1521 | } | |
1522 | EXPORT_SYMBOL(of_find_all_nodes); | |
1523 | ||
1524 | /** | |
1525 | * of_get_parent - Get a node's parent if any | |
1526 | * @node: Node to get parent | |
1527 | * | |
1528 | * Returns a node pointer with refcount incremented, use | |
1529 | * of_node_put() on it when done. | |
1530 | */ | |
1531 | struct device_node *of_get_parent(const struct device_node *node) | |
1532 | { | |
1533 | struct device_node *np; | |
1534 | ||
1535 | if (!node) | |
1536 | return NULL; | |
1537 | ||
1538 | read_lock(&devtree_lock); | |
1539 | np = of_node_get(node->parent); | |
1540 | read_unlock(&devtree_lock); | |
1541 | return np; | |
1542 | } | |
1543 | EXPORT_SYMBOL(of_get_parent); | |
1544 | ||
1545 | /** | |
1546 | * of_get_next_child - Iterate a node childs | |
1547 | * @node: parent node | |
1548 | * @prev: previous child of the parent node, or NULL to get first | |
1549 | * | |
1550 | * Returns a node pointer with refcount incremented, use | |
1551 | * of_node_put() on it when done. | |
1552 | */ | |
1553 | struct device_node *of_get_next_child(const struct device_node *node, | |
1554 | struct device_node *prev) | |
1555 | { | |
1556 | struct device_node *next; | |
1557 | ||
1558 | read_lock(&devtree_lock); | |
1559 | next = prev ? prev->sibling : node->child; | |
1560 | for (; next != 0; next = next->sibling) | |
1561 | if (of_node_get(next)) | |
1562 | break; | |
1563 | if (prev) | |
1564 | of_node_put(prev); | |
1565 | read_unlock(&devtree_lock); | |
1566 | return next; | |
1567 | } | |
1568 | EXPORT_SYMBOL(of_get_next_child); | |
1569 | ||
1570 | /** | |
1571 | * of_node_get - Increment refcount of a node | |
1572 | * @node: Node to inc refcount, NULL is supported to | |
1573 | * simplify writing of callers | |
1574 | * | |
1575 | * Returns node. | |
1576 | */ | |
1577 | struct device_node *of_node_get(struct device_node *node) | |
1578 | { | |
1579 | if (node) | |
1580 | kref_get(&node->kref); | |
1581 | return node; | |
1582 | } | |
1583 | EXPORT_SYMBOL(of_node_get); | |
1584 | ||
1585 | static inline struct device_node * kref_to_device_node(struct kref *kref) | |
1586 | { | |
1587 | return container_of(kref, struct device_node, kref); | |
1588 | } | |
1589 | ||
1590 | /** | |
1591 | * of_node_release - release a dynamically allocated node | |
1592 | * @kref: kref element of the node to be released | |
1593 | * | |
1594 | * In of_node_put() this function is passed to kref_put() | |
1595 | * as the destructor. | |
1596 | */ | |
1597 | static void of_node_release(struct kref *kref) | |
1598 | { | |
1599 | struct device_node *node = kref_to_device_node(kref); | |
1600 | struct property *prop = node->properties; | |
1601 | ||
1602 | if (!OF_IS_DYNAMIC(node)) | |
1603 | return; | |
1604 | while (prop) { | |
1605 | struct property *next = prop->next; | |
1606 | kfree(prop->name); | |
1607 | kfree(prop->value); | |
1608 | kfree(prop); | |
1609 | prop = next; | |
1610 | } | |
1611 | kfree(node->intrs); | |
9b6b563c PM |
1612 | kfree(node->full_name); |
1613 | kfree(node->data); | |
1614 | kfree(node); | |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * of_node_put - Decrement refcount of a node | |
1619 | * @node: Node to dec refcount, NULL is supported to | |
1620 | * simplify writing of callers | |
1621 | * | |
1622 | */ | |
1623 | void of_node_put(struct device_node *node) | |
1624 | { | |
1625 | if (node) | |
1626 | kref_put(&node->kref, of_node_release); | |
1627 | } | |
1628 | EXPORT_SYMBOL(of_node_put); | |
1629 | ||
1630 | /* | |
1631 | * Plug a device node into the tree and global list. | |
1632 | */ | |
1633 | void of_attach_node(struct device_node *np) | |
1634 | { | |
1635 | write_lock(&devtree_lock); | |
1636 | np->sibling = np->parent->child; | |
1637 | np->allnext = allnodes; | |
1638 | np->parent->child = np; | |
1639 | allnodes = np; | |
1640 | write_unlock(&devtree_lock); | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * "Unplug" a node from the device tree. The caller must hold | |
1645 | * a reference to the node. The memory associated with the node | |
1646 | * is not freed until its refcount goes to zero. | |
1647 | */ | |
1648 | void of_detach_node(const struct device_node *np) | |
1649 | { | |
1650 | struct device_node *parent; | |
1651 | ||
1652 | write_lock(&devtree_lock); | |
1653 | ||
1654 | parent = np->parent; | |
1655 | ||
1656 | if (allnodes == np) | |
1657 | allnodes = np->allnext; | |
1658 | else { | |
1659 | struct device_node *prev; | |
1660 | for (prev = allnodes; | |
1661 | prev->allnext != np; | |
1662 | prev = prev->allnext) | |
1663 | ; | |
1664 | prev->allnext = np->allnext; | |
1665 | } | |
1666 | ||
1667 | if (parent->child == np) | |
1668 | parent->child = np->sibling; | |
1669 | else { | |
1670 | struct device_node *prevsib; | |
1671 | for (prevsib = np->parent->child; | |
1672 | prevsib->sibling != np; | |
1673 | prevsib = prevsib->sibling) | |
1674 | ; | |
1675 | prevsib->sibling = np->sibling; | |
1676 | } | |
1677 | ||
1678 | write_unlock(&devtree_lock); | |
1679 | } | |
1680 | ||
1681 | #ifdef CONFIG_PPC_PSERIES | |
1682 | /* | |
1683 | * Fix up the uninitialized fields in a new device node: | |
1684 | * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields | |
1685 | * | |
1686 | * A lot of boot-time code is duplicated here, because functions such | |
1687 | * as finish_node_interrupts, interpret_pci_props, etc. cannot use the | |
1688 | * slab allocator. | |
1689 | * | |
1690 | * This should probably be split up into smaller chunks. | |
1691 | */ | |
1692 | ||
cc5d0189 | 1693 | static int of_finish_dynamic_node(struct device_node *node) |
9b6b563c PM |
1694 | { |
1695 | struct device_node *parent = of_get_parent(node); | |
1696 | int err = 0; | |
1697 | phandle *ibm_phandle; | |
1698 | ||
1699 | node->name = get_property(node, "name", NULL); | |
1700 | node->type = get_property(node, "device_type", NULL); | |
1701 | ||
1702 | if (!parent) { | |
1703 | err = -ENODEV; | |
1704 | goto out; | |
1705 | } | |
1706 | ||
1707 | /* We don't support that function on PowerMac, at least | |
1708 | * not yet | |
1709 | */ | |
799d6046 | 1710 | if (_machine == PLATFORM_POWERMAC) |
9b6b563c PM |
1711 | return -ENODEV; |
1712 | ||
1713 | /* fix up new node's linux_phandle field */ | |
cc5d0189 BH |
1714 | if ((ibm_phandle = (unsigned int *)get_property(node, |
1715 | "ibm,phandle", NULL))) | |
9b6b563c PM |
1716 | node->linux_phandle = *ibm_phandle; |
1717 | ||
1718 | out: | |
1719 | of_node_put(parent); | |
1720 | return err; | |
1721 | } | |
1722 | ||
1723 | static int prom_reconfig_notifier(struct notifier_block *nb, | |
1724 | unsigned long action, void *node) | |
1725 | { | |
1726 | int err; | |
1727 | ||
1728 | switch (action) { | |
1729 | case PSERIES_RECONFIG_ADD: | |
cc5d0189 BH |
1730 | err = of_finish_dynamic_node(node); |
1731 | if (!err) | |
1732 | finish_node(node, NULL, 0); | |
9b6b563c PM |
1733 | if (err < 0) { |
1734 | printk(KERN_ERR "finish_node returned %d\n", err); | |
1735 | err = NOTIFY_BAD; | |
1736 | } | |
1737 | break; | |
1738 | default: | |
1739 | err = NOTIFY_DONE; | |
1740 | break; | |
1741 | } | |
1742 | return err; | |
1743 | } | |
1744 | ||
1745 | static struct notifier_block prom_reconfig_nb = { | |
1746 | .notifier_call = prom_reconfig_notifier, | |
1747 | .priority = 10, /* This one needs to run first */ | |
1748 | }; | |
1749 | ||
1750 | static int __init prom_reconfig_setup(void) | |
1751 | { | |
1752 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); | |
1753 | } | |
1754 | __initcall(prom_reconfig_setup); | |
1755 | #endif | |
1756 | ||
1757 | /* | |
1758 | * Find a property with a given name for a given node | |
1759 | * and return the value. | |
1760 | */ | |
1761 | unsigned char *get_property(struct device_node *np, const char *name, | |
1762 | int *lenp) | |
1763 | { | |
1764 | struct property *pp; | |
1765 | ||
1766 | for (pp = np->properties; pp != 0; pp = pp->next) | |
1767 | if (strcmp(pp->name, name) == 0) { | |
1768 | if (lenp != 0) | |
1769 | *lenp = pp->length; | |
1770 | return pp->value; | |
1771 | } | |
1772 | return NULL; | |
1773 | } | |
1774 | EXPORT_SYMBOL(get_property); | |
1775 | ||
1776 | /* | |
1777 | * Add a property to a node | |
1778 | */ | |
183d0202 | 1779 | int prom_add_property(struct device_node* np, struct property* prop) |
9b6b563c | 1780 | { |
183d0202 | 1781 | struct property **next; |
9b6b563c PM |
1782 | |
1783 | prop->next = NULL; | |
183d0202 BH |
1784 | write_lock(&devtree_lock); |
1785 | next = &np->properties; | |
1786 | while (*next) { | |
1787 | if (strcmp(prop->name, (*next)->name) == 0) { | |
1788 | /* duplicate ! don't insert it */ | |
1789 | write_unlock(&devtree_lock); | |
1790 | return -1; | |
1791 | } | |
9b6b563c | 1792 | next = &(*next)->next; |
183d0202 | 1793 | } |
9b6b563c | 1794 | *next = prop; |
183d0202 BH |
1795 | write_unlock(&devtree_lock); |
1796 | ||
799d6046 | 1797 | #ifdef CONFIG_PROC_DEVICETREE |
183d0202 BH |
1798 | /* try to add to proc as well if it was initialized */ |
1799 | if (np->pde) | |
1800 | proc_device_tree_add_prop(np->pde, prop); | |
799d6046 | 1801 | #endif /* CONFIG_PROC_DEVICETREE */ |
183d0202 BH |
1802 | |
1803 | return 0; | |
9b6b563c PM |
1804 | } |
1805 | ||
9b6b563c | 1806 |