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> |
2babf5c2 | 53 | #include <asm/kexec.h> |
9b6b563c PM |
54 | |
55 | #ifdef DEBUG | |
56 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
57 | #else | |
58 | #define DBG(fmt...) | |
59 | #endif | |
60 | ||
9b6b563c | 61 | |
9b6b563c PM |
62 | static int __initdata dt_root_addr_cells; |
63 | static int __initdata dt_root_size_cells; | |
64 | ||
65 | #ifdef CONFIG_PPC64 | |
28897731 | 66 | int __initdata iommu_is_off; |
9b6b563c | 67 | int __initdata iommu_force_on; |
cf00a8d1 | 68 | unsigned long tce_alloc_start, tce_alloc_end; |
9b6b563c PM |
69 | #endif |
70 | ||
71 | typedef u32 cell_t; | |
72 | ||
73 | #if 0 | |
74 | static struct boot_param_header *initial_boot_params __initdata; | |
75 | #else | |
76 | struct boot_param_header *initial_boot_params; | |
77 | #endif | |
78 | ||
79 | static struct device_node *allnodes = NULL; | |
80 | ||
81 | /* use when traversing tree through the allnext, child, sibling, | |
82 | * or parent members of struct device_node. | |
83 | */ | |
84 | static DEFINE_RWLOCK(devtree_lock); | |
85 | ||
86 | /* export that to outside world */ | |
87 | struct device_node *of_chosen; | |
88 | ||
89 | struct device_node *dflt_interrupt_controller; | |
90 | int num_interrupt_controllers; | |
91 | ||
9b6b563c PM |
92 | /* |
93 | * Wrapper for allocating memory for various data that needs to be | |
94 | * attached to device nodes as they are processed at boot or when | |
95 | * added to the device tree later (e.g. DLPAR). At boot there is | |
96 | * already a region reserved so we just increment *mem_start by size; | |
97 | * otherwise we call kmalloc. | |
98 | */ | |
99 | static void * prom_alloc(unsigned long size, unsigned long *mem_start) | |
100 | { | |
101 | unsigned long tmp; | |
102 | ||
103 | if (!mem_start) | |
104 | return kmalloc(size, GFP_KERNEL); | |
105 | ||
106 | tmp = *mem_start; | |
107 | *mem_start += size; | |
108 | return (void *)tmp; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Find the device_node with a given phandle. | |
113 | */ | |
114 | static struct device_node * find_phandle(phandle ph) | |
115 | { | |
116 | struct device_node *np; | |
117 | ||
118 | for (np = allnodes; np != 0; np = np->allnext) | |
119 | if (np->linux_phandle == ph) | |
120 | return np; | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Find the interrupt parent of a node. | |
126 | */ | |
127 | static struct device_node * __devinit intr_parent(struct device_node *p) | |
128 | { | |
129 | phandle *parp; | |
130 | ||
131 | parp = (phandle *) get_property(p, "interrupt-parent", NULL); | |
132 | if (parp == NULL) | |
133 | return p->parent; | |
134 | p = find_phandle(*parp); | |
135 | if (p != NULL) | |
136 | return p; | |
137 | /* | |
138 | * On a powermac booted with BootX, we don't get to know the | |
139 | * phandles for any nodes, so find_phandle will return NULL. | |
140 | * Fortunately these machines only have one interrupt controller | |
141 | * so there isn't in fact any ambiguity. -- paulus | |
142 | */ | |
143 | if (num_interrupt_controllers == 1) | |
144 | p = dflt_interrupt_controller; | |
145 | return p; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Find out the size of each entry of the interrupts property | |
150 | * for a node. | |
151 | */ | |
152 | int __devinit prom_n_intr_cells(struct device_node *np) | |
153 | { | |
154 | struct device_node *p; | |
155 | unsigned int *icp; | |
156 | ||
157 | for (p = np; (p = intr_parent(p)) != NULL; ) { | |
158 | icp = (unsigned int *) | |
159 | get_property(p, "#interrupt-cells", NULL); | |
160 | if (icp != NULL) | |
161 | return *icp; | |
162 | if (get_property(p, "interrupt-controller", NULL) != NULL | |
163 | || get_property(p, "interrupt-map", NULL) != NULL) { | |
164 | printk("oops, node %s doesn't have #interrupt-cells\n", | |
165 | p->full_name); | |
166 | return 1; | |
167 | } | |
168 | } | |
169 | #ifdef DEBUG_IRQ | |
170 | printk("prom_n_intr_cells failed for %s\n", np->full_name); | |
171 | #endif | |
172 | return 1; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Map an interrupt from a device up to the platform interrupt | |
177 | * descriptor. | |
178 | */ | |
179 | static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler, | |
180 | struct device_node *np, unsigned int *ints, | |
181 | int nintrc) | |
182 | { | |
183 | struct device_node *p, *ipar; | |
184 | unsigned int *imap, *imask, *ip; | |
185 | int i, imaplen, match; | |
186 | int newintrc = 0, newaddrc = 0; | |
187 | unsigned int *reg; | |
188 | int naddrc; | |
189 | ||
190 | reg = (unsigned int *) get_property(np, "reg", NULL); | |
191 | naddrc = prom_n_addr_cells(np); | |
192 | p = intr_parent(np); | |
193 | while (p != NULL) { | |
194 | if (get_property(p, "interrupt-controller", NULL) != NULL) | |
195 | /* this node is an interrupt controller, stop here */ | |
196 | break; | |
197 | imap = (unsigned int *) | |
198 | get_property(p, "interrupt-map", &imaplen); | |
199 | if (imap == NULL) { | |
200 | p = intr_parent(p); | |
201 | continue; | |
202 | } | |
203 | imask = (unsigned int *) | |
204 | get_property(p, "interrupt-map-mask", NULL); | |
205 | if (imask == NULL) { | |
206 | printk("oops, %s has interrupt-map but no mask\n", | |
207 | p->full_name); | |
208 | return 0; | |
209 | } | |
210 | imaplen /= sizeof(unsigned int); | |
211 | match = 0; | |
212 | ipar = NULL; | |
213 | while (imaplen > 0 && !match) { | |
214 | /* check the child-interrupt field */ | |
215 | match = 1; | |
216 | for (i = 0; i < naddrc && match; ++i) | |
217 | match = ((reg[i] ^ imap[i]) & imask[i]) == 0; | |
218 | for (; i < naddrc + nintrc && match; ++i) | |
219 | match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0; | |
220 | imap += naddrc + nintrc; | |
221 | imaplen -= naddrc + nintrc; | |
222 | /* grab the interrupt parent */ | |
223 | ipar = find_phandle((phandle) *imap++); | |
224 | --imaplen; | |
225 | if (ipar == NULL && num_interrupt_controllers == 1) | |
226 | /* cope with BootX not giving us phandles */ | |
227 | ipar = dflt_interrupt_controller; | |
228 | if (ipar == NULL) { | |
229 | printk("oops, no int parent %x in map of %s\n", | |
230 | imap[-1], p->full_name); | |
231 | return 0; | |
232 | } | |
233 | /* find the parent's # addr and intr cells */ | |
234 | ip = (unsigned int *) | |
235 | get_property(ipar, "#interrupt-cells", NULL); | |
236 | if (ip == NULL) { | |
237 | printk("oops, no #interrupt-cells on %s\n", | |
238 | ipar->full_name); | |
239 | return 0; | |
240 | } | |
241 | newintrc = *ip; | |
242 | ip = (unsigned int *) | |
243 | get_property(ipar, "#address-cells", NULL); | |
244 | newaddrc = (ip == NULL)? 0: *ip; | |
245 | imap += newaddrc + newintrc; | |
246 | imaplen -= newaddrc + newintrc; | |
247 | } | |
248 | if (imaplen < 0) { | |
249 | printk("oops, error decoding int-map on %s, len=%d\n", | |
250 | p->full_name, imaplen); | |
251 | return 0; | |
252 | } | |
253 | if (!match) { | |
254 | #ifdef DEBUG_IRQ | |
255 | printk("oops, no match in %s int-map for %s\n", | |
256 | p->full_name, np->full_name); | |
257 | #endif | |
258 | return 0; | |
259 | } | |
260 | p = ipar; | |
261 | naddrc = newaddrc; | |
262 | nintrc = newintrc; | |
263 | ints = imap - nintrc; | |
264 | reg = ints - naddrc; | |
265 | } | |
266 | if (p == NULL) { | |
267 | #ifdef DEBUG_IRQ | |
268 | printk("hmmm, int tree for %s doesn't have ctrler\n", | |
269 | np->full_name); | |
270 | #endif | |
271 | return 0; | |
272 | } | |
273 | *irq = ints; | |
274 | *ictrler = p; | |
275 | return nintrc; | |
276 | } | |
277 | ||
6d0124fc PM |
278 | static unsigned char map_isa_senses[4] = { |
279 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
280 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
281 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
282 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE | |
283 | }; | |
284 | ||
285 | static unsigned char map_mpic_senses[4] = { | |
286 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE, | |
287 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
288 | /* 2 seems to be used for the 8259 cascade... */ | |
289 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
290 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
291 | }; | |
292 | ||
9b6b563c PM |
293 | static int __devinit finish_node_interrupts(struct device_node *np, |
294 | unsigned long *mem_start, | |
295 | int measure_only) | |
296 | { | |
297 | unsigned int *ints; | |
298 | int intlen, intrcells, intrcount; | |
6d0124fc | 299 | int i, j, n, sense; |
9b6b563c PM |
300 | unsigned int *irq, virq; |
301 | struct device_node *ic; | |
1beb6a7d BH |
302 | int trace = 0; |
303 | ||
304 | //#define TRACE(fmt...) do { if (trace) { printk(fmt); mdelay(1000); } } while(0) | |
305 | #define TRACE(fmt...) | |
306 | ||
307 | if (!strcmp(np->name, "smu-doorbell")) | |
308 | trace = 1; | |
309 | ||
310 | TRACE("Finishing SMU doorbell ! num_interrupt_controllers = %d\n", | |
311 | num_interrupt_controllers); | |
9b6b563c | 312 | |
a575b807 PM |
313 | if (num_interrupt_controllers == 0) { |
314 | /* | |
315 | * Old machines just have a list of interrupt numbers | |
316 | * and no interrupt-controller nodes. | |
317 | */ | |
318 | ints = (unsigned int *) get_property(np, "AAPL,interrupts", | |
319 | &intlen); | |
320 | /* XXX old interpret_pci_props looked in parent too */ | |
321 | /* XXX old interpret_macio_props looked for interrupts | |
322 | before AAPL,interrupts */ | |
323 | if (ints == NULL) | |
324 | ints = (unsigned int *) get_property(np, "interrupts", | |
325 | &intlen); | |
326 | if (ints == NULL) | |
327 | return 0; | |
328 | ||
329 | np->n_intrs = intlen / sizeof(unsigned int); | |
330 | np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]), | |
331 | mem_start); | |
332 | if (!np->intrs) | |
333 | return -ENOMEM; | |
334 | if (measure_only) | |
335 | return 0; | |
336 | ||
337 | for (i = 0; i < np->n_intrs; ++i) { | |
338 | np->intrs[i].line = *ints++; | |
6d0124fc PM |
339 | np->intrs[i].sense = IRQ_SENSE_LEVEL |
340 | | IRQ_POLARITY_NEGATIVE; | |
a575b807 PM |
341 | } |
342 | return 0; | |
343 | } | |
344 | ||
9b6b563c | 345 | ints = (unsigned int *) get_property(np, "interrupts", &intlen); |
1beb6a7d | 346 | TRACE("ints=%p, intlen=%d\n", ints, intlen); |
9b6b563c PM |
347 | if (ints == NULL) |
348 | return 0; | |
349 | intrcells = prom_n_intr_cells(np); | |
350 | intlen /= intrcells * sizeof(unsigned int); | |
1beb6a7d | 351 | TRACE("intrcells=%d, new intlen=%d\n", intrcells, intlen); |
9b6b563c PM |
352 | np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start); |
353 | if (!np->intrs) | |
354 | return -ENOMEM; | |
355 | ||
356 | if (measure_only) | |
357 | return 0; | |
358 | ||
359 | intrcount = 0; | |
360 | for (i = 0; i < intlen; ++i, ints += intrcells) { | |
361 | n = map_interrupt(&irq, &ic, np, ints, intrcells); | |
1beb6a7d | 362 | TRACE("map, irq=%d, ic=%p, n=%d\n", irq, ic, n); |
9b6b563c PM |
363 | if (n <= 0) |
364 | continue; | |
365 | ||
366 | /* don't map IRQ numbers under a cascaded 8259 controller */ | |
367 | if (ic && device_is_compatible(ic, "chrp,iic")) { | |
368 | np->intrs[intrcount].line = irq[0]; | |
6d0124fc PM |
369 | sense = (n > 1)? (irq[1] & 3): 3; |
370 | np->intrs[intrcount].sense = map_isa_senses[sense]; | |
9b6b563c | 371 | } else { |
9b6b563c | 372 | virq = virt_irq_create_mapping(irq[0]); |
1beb6a7d | 373 | TRACE("virq=%d\n", virq); |
6d0124fc | 374 | #ifdef CONFIG_PPC64 |
9b6b563c PM |
375 | if (virq == NO_IRQ) { |
376 | printk(KERN_CRIT "Could not allocate interrupt" | |
377 | " number for %s\n", np->full_name); | |
378 | continue; | |
379 | } | |
9b6b563c | 380 | #endif |
6d0124fc PM |
381 | np->intrs[intrcount].line = irq_offset_up(virq); |
382 | sense = (n > 1)? (irq[1] & 3): 1; | |
1beb6a7d BH |
383 | |
384 | /* Apple uses bits in there in a different way, let's | |
385 | * only keep the real sense bit on macs | |
386 | */ | |
e8222502 | 387 | if (machine_is(powermac)) |
1beb6a7d | 388 | sense &= 0x1; |
6d0124fc | 389 | np->intrs[intrcount].sense = map_mpic_senses[sense]; |
9b6b563c PM |
390 | } |
391 | ||
392 | #ifdef CONFIG_PPC64 | |
393 | /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */ | |
e8222502 | 394 | if (machine_is(powermac) && ic && ic->parent) { |
9b6b563c PM |
395 | char *name = get_property(ic->parent, "name", NULL); |
396 | if (name && !strcmp(name, "u3")) | |
397 | np->intrs[intrcount].line += 128; | |
1beb6a7d BH |
398 | else if (!(name && (!strcmp(name, "mac-io") || |
399 | !strcmp(name, "u4")))) | |
9b6b563c PM |
400 | /* ignore other cascaded controllers, such as |
401 | the k2-sata-root */ | |
402 | break; | |
403 | } | |
1beb6a7d | 404 | #endif /* CONFIG_PPC64 */ |
9b6b563c PM |
405 | if (n > 2) { |
406 | printk("hmmm, got %d intr cells for %s:", n, | |
407 | np->full_name); | |
408 | for (j = 0; j < n; ++j) | |
409 | printk(" %d", irq[j]); | |
410 | printk("\n"); | |
411 | } | |
412 | ++intrcount; | |
413 | } | |
414 | np->n_intrs = intrcount; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
9b6b563c PM |
419 | static int __devinit finish_node(struct device_node *np, |
420 | unsigned long *mem_start, | |
9b6b563c PM |
421 | int measure_only) |
422 | { | |
423 | struct device_node *child; | |
cc5d0189 | 424 | int rc = 0; |
9b6b563c PM |
425 | |
426 | rc = finish_node_interrupts(np, mem_start, measure_only); | |
427 | if (rc) | |
428 | goto out; | |
429 | ||
9b6b563c | 430 | for (child = np->child; child != NULL; child = child->sibling) { |
cc5d0189 | 431 | rc = finish_node(child, mem_start, measure_only); |
9b6b563c PM |
432 | if (rc) |
433 | goto out; | |
434 | } | |
435 | out: | |
436 | return rc; | |
437 | } | |
438 | ||
439 | static void __init scan_interrupt_controllers(void) | |
440 | { | |
441 | struct device_node *np; | |
442 | int n = 0; | |
443 | char *name, *ic; | |
444 | int iclen; | |
445 | ||
446 | for (np = allnodes; np != NULL; np = np->allnext) { | |
447 | ic = get_property(np, "interrupt-controller", &iclen); | |
448 | name = get_property(np, "name", NULL); | |
449 | /* checking iclen makes sure we don't get a false | |
450 | match on /chosen.interrupt_controller */ | |
451 | if ((name != NULL | |
452 | && strcmp(name, "interrupt-controller") == 0) | |
453 | || (ic != NULL && iclen == 0 | |
454 | && strcmp(name, "AppleKiwi"))) { | |
455 | if (n == 0) | |
456 | dflt_interrupt_controller = np; | |
457 | ++n; | |
458 | } | |
459 | } | |
460 | num_interrupt_controllers = n; | |
461 | } | |
462 | ||
463 | /** | |
464 | * finish_device_tree is called once things are running normally | |
465 | * (i.e. with text and data mapped to the address they were linked at). | |
466 | * It traverses the device tree and fills in some of the additional, | |
467 | * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt | |
468 | * mapping is also initialized at this point. | |
469 | */ | |
470 | void __init finish_device_tree(void) | |
471 | { | |
472 | unsigned long start, end, size = 0; | |
473 | ||
474 | DBG(" -> finish_device_tree\n"); | |
475 | ||
476 | #ifdef CONFIG_PPC64 | |
477 | /* Initialize virtual IRQ map */ | |
478 | virt_irq_init(); | |
479 | #endif | |
480 | scan_interrupt_controllers(); | |
481 | ||
482 | /* | |
483 | * Finish device-tree (pre-parsing some properties etc...) | |
484 | * We do this in 2 passes. One with "measure_only" set, which | |
485 | * will only measure the amount of memory needed, then we can | |
486 | * allocate that memory, and call finish_node again. However, | |
487 | * we must be careful as most routines will fail nowadays when | |
488 | * prom_alloc() returns 0, so we must make sure our first pass | |
489 | * doesn't start at 0. We pre-initialize size to 16 for that | |
490 | * reason and then remove those additional 16 bytes | |
491 | */ | |
492 | size = 16; | |
cc5d0189 | 493 | finish_node(allnodes, &size, 1); |
9b6b563c | 494 | size -= 16; |
fa938953 ME |
495 | |
496 | if (0 == size) | |
497 | end = start = 0; | |
498 | else | |
499 | end = start = (unsigned long)__va(lmb_alloc(size, 128)); | |
500 | ||
cc5d0189 | 501 | finish_node(allnodes, &end, 0); |
9b6b563c PM |
502 | BUG_ON(end != start + size); |
503 | ||
504 | DBG(" <- finish_device_tree\n"); | |
505 | } | |
506 | ||
507 | static inline char *find_flat_dt_string(u32 offset) | |
508 | { | |
509 | return ((char *)initial_boot_params) + | |
510 | initial_boot_params->off_dt_strings + offset; | |
511 | } | |
512 | ||
513 | /** | |
514 | * This function is used to scan the flattened device-tree, it is | |
515 | * used to extract the memory informations at boot before we can | |
516 | * unflatten the tree | |
517 | */ | |
3c726f8d BH |
518 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
519 | const char *uname, int depth, | |
520 | void *data), | |
521 | void *data) | |
9b6b563c PM |
522 | { |
523 | unsigned long p = ((unsigned long)initial_boot_params) + | |
524 | initial_boot_params->off_dt_struct; | |
525 | int rc = 0; | |
526 | int depth = -1; | |
527 | ||
528 | do { | |
529 | u32 tag = *((u32 *)p); | |
530 | char *pathp; | |
531 | ||
532 | p += 4; | |
533 | if (tag == OF_DT_END_NODE) { | |
534 | depth --; | |
535 | continue; | |
536 | } | |
537 | if (tag == OF_DT_NOP) | |
538 | continue; | |
539 | if (tag == OF_DT_END) | |
540 | break; | |
541 | if (tag == OF_DT_PROP) { | |
542 | u32 sz = *((u32 *)p); | |
543 | p += 8; | |
544 | if (initial_boot_params->version < 0x10) | |
545 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
546 | p += sz; | |
547 | p = _ALIGN(p, 4); | |
548 | continue; | |
549 | } | |
550 | if (tag != OF_DT_BEGIN_NODE) { | |
551 | printk(KERN_WARNING "Invalid tag %x scanning flattened" | |
552 | " device tree !\n", tag); | |
553 | return -EINVAL; | |
554 | } | |
555 | depth++; | |
556 | pathp = (char *)p; | |
557 | p = _ALIGN(p + strlen(pathp) + 1, 4); | |
558 | if ((*pathp) == '/') { | |
559 | char *lp, *np; | |
560 | for (lp = NULL, np = pathp; *np; np++) | |
561 | if ((*np) == '/') | |
562 | lp = np+1; | |
563 | if (lp != NULL) | |
564 | pathp = lp; | |
565 | } | |
566 | rc = it(p, pathp, depth, data); | |
567 | if (rc != 0) | |
568 | break; | |
569 | } while(1); | |
570 | ||
571 | return rc; | |
572 | } | |
573 | ||
e8222502 BH |
574 | unsigned long __init of_get_flat_dt_root(void) |
575 | { | |
576 | unsigned long p = ((unsigned long)initial_boot_params) + | |
577 | initial_boot_params->off_dt_struct; | |
578 | ||
579 | while(*((u32 *)p) == OF_DT_NOP) | |
580 | p += 4; | |
581 | BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE); | |
582 | p += 4; | |
583 | return _ALIGN(p + strlen((char *)p) + 1, 4); | |
584 | } | |
585 | ||
9b6b563c PM |
586 | /** |
587 | * This function can be used within scan_flattened_dt callback to get | |
588 | * access to properties | |
589 | */ | |
3c726f8d BH |
590 | void* __init of_get_flat_dt_prop(unsigned long node, const char *name, |
591 | unsigned long *size) | |
9b6b563c PM |
592 | { |
593 | unsigned long p = node; | |
594 | ||
595 | do { | |
596 | u32 tag = *((u32 *)p); | |
597 | u32 sz, noff; | |
598 | const char *nstr; | |
599 | ||
600 | p += 4; | |
601 | if (tag == OF_DT_NOP) | |
602 | continue; | |
603 | if (tag != OF_DT_PROP) | |
604 | return NULL; | |
605 | ||
606 | sz = *((u32 *)p); | |
607 | noff = *((u32 *)(p + 4)); | |
608 | p += 8; | |
609 | if (initial_boot_params->version < 0x10) | |
610 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
611 | ||
612 | nstr = find_flat_dt_string(noff); | |
613 | if (nstr == NULL) { | |
614 | printk(KERN_WARNING "Can't find property index" | |
615 | " name !\n"); | |
616 | return NULL; | |
617 | } | |
618 | if (strcmp(name, nstr) == 0) { | |
619 | if (size) | |
620 | *size = sz; | |
621 | return (void *)p; | |
622 | } | |
623 | p += sz; | |
624 | p = _ALIGN(p, 4); | |
625 | } while(1); | |
626 | } | |
627 | ||
e8222502 BH |
628 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) |
629 | { | |
630 | const char* cp; | |
631 | unsigned long cplen, l; | |
632 | ||
633 | cp = of_get_flat_dt_prop(node, "compatible", &cplen); | |
634 | if (cp == NULL) | |
635 | return 0; | |
636 | while (cplen > 0) { | |
637 | if (strncasecmp(cp, compat, strlen(compat)) == 0) | |
638 | return 1; | |
639 | l = strlen(cp) + 1; | |
640 | cp += l; | |
641 | cplen -= l; | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
9b6b563c PM |
647 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
648 | unsigned long align) | |
649 | { | |
650 | void *res; | |
651 | ||
652 | *mem = _ALIGN(*mem, align); | |
653 | res = (void *)*mem; | |
654 | *mem += size; | |
655 | ||
656 | return res; | |
657 | } | |
658 | ||
659 | static unsigned long __init unflatten_dt_node(unsigned long mem, | |
660 | unsigned long *p, | |
661 | struct device_node *dad, | |
662 | struct device_node ***allnextpp, | |
663 | unsigned long fpsize) | |
664 | { | |
665 | struct device_node *np; | |
666 | struct property *pp, **prev_pp = NULL; | |
667 | char *pathp; | |
668 | u32 tag; | |
669 | unsigned int l, allocl; | |
670 | int has_name = 0; | |
671 | int new_format = 0; | |
672 | ||
673 | tag = *((u32 *)(*p)); | |
674 | if (tag != OF_DT_BEGIN_NODE) { | |
675 | printk("Weird tag at start of node: %x\n", tag); | |
676 | return mem; | |
677 | } | |
678 | *p += 4; | |
679 | pathp = (char *)*p; | |
680 | l = allocl = strlen(pathp) + 1; | |
681 | *p = _ALIGN(*p + l, 4); | |
682 | ||
683 | /* version 0x10 has a more compact unit name here instead of the full | |
684 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
685 | * it later. We detect this because the first character of the name is | |
686 | * not '/'. | |
687 | */ | |
688 | if ((*pathp) != '/') { | |
689 | new_format = 1; | |
690 | if (fpsize == 0) { | |
691 | /* root node: special case. fpsize accounts for path | |
692 | * plus terminating zero. root node only has '/', so | |
693 | * fpsize should be 2, but we want to avoid the first | |
694 | * level nodes to have two '/' so we use fpsize 1 here | |
695 | */ | |
696 | fpsize = 1; | |
697 | allocl = 2; | |
698 | } else { | |
699 | /* account for '/' and path size minus terminal 0 | |
700 | * already in 'l' | |
701 | */ | |
702 | fpsize += l; | |
703 | allocl = fpsize; | |
704 | } | |
705 | } | |
706 | ||
707 | ||
708 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
709 | __alignof__(struct device_node)); | |
710 | if (allnextpp) { | |
711 | memset(np, 0, sizeof(*np)); | |
712 | np->full_name = ((char*)np) + sizeof(struct device_node); | |
713 | if (new_format) { | |
714 | char *p = np->full_name; | |
715 | /* rebuild full path for new format */ | |
716 | if (dad && dad->parent) { | |
717 | strcpy(p, dad->full_name); | |
718 | #ifdef DEBUG | |
719 | if ((strlen(p) + l + 1) != allocl) { | |
720 | DBG("%s: p: %d, l: %d, a: %d\n", | |
e8222502 | 721 | pathp, (int)strlen(p), l, allocl); |
9b6b563c PM |
722 | } |
723 | #endif | |
724 | p += strlen(p); | |
725 | } | |
726 | *(p++) = '/'; | |
727 | memcpy(p, pathp, l); | |
728 | } else | |
729 | memcpy(np->full_name, pathp, l); | |
730 | prev_pp = &np->properties; | |
731 | **allnextpp = np; | |
732 | *allnextpp = &np->allnext; | |
733 | if (dad != NULL) { | |
734 | np->parent = dad; | |
735 | /* we temporarily use the next field as `last_child'*/ | |
736 | if (dad->next == 0) | |
737 | dad->child = np; | |
738 | else | |
739 | dad->next->sibling = np; | |
740 | dad->next = np; | |
741 | } | |
742 | kref_init(&np->kref); | |
743 | } | |
744 | while(1) { | |
745 | u32 sz, noff; | |
746 | char *pname; | |
747 | ||
748 | tag = *((u32 *)(*p)); | |
749 | if (tag == OF_DT_NOP) { | |
750 | *p += 4; | |
751 | continue; | |
752 | } | |
753 | if (tag != OF_DT_PROP) | |
754 | break; | |
755 | *p += 4; | |
756 | sz = *((u32 *)(*p)); | |
757 | noff = *((u32 *)((*p) + 4)); | |
758 | *p += 8; | |
759 | if (initial_boot_params->version < 0x10) | |
760 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); | |
761 | ||
762 | pname = find_flat_dt_string(noff); | |
763 | if (pname == NULL) { | |
764 | printk("Can't find property name in list !\n"); | |
765 | break; | |
766 | } | |
767 | if (strcmp(pname, "name") == 0) | |
768 | has_name = 1; | |
769 | l = strlen(pname) + 1; | |
770 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
771 | __alignof__(struct property)); | |
772 | if (allnextpp) { | |
773 | if (strcmp(pname, "linux,phandle") == 0) { | |
774 | np->node = *((u32 *)*p); | |
775 | if (np->linux_phandle == 0) | |
776 | np->linux_phandle = np->node; | |
777 | } | |
778 | if (strcmp(pname, "ibm,phandle") == 0) | |
779 | np->linux_phandle = *((u32 *)*p); | |
780 | pp->name = pname; | |
781 | pp->length = sz; | |
782 | pp->value = (void *)*p; | |
783 | *prev_pp = pp; | |
784 | prev_pp = &pp->next; | |
785 | } | |
786 | *p = _ALIGN((*p) + sz, 4); | |
787 | } | |
788 | /* with version 0x10 we may not have the name property, recreate | |
789 | * it here from the unit name if absent | |
790 | */ | |
791 | if (!has_name) { | |
792 | char *p = pathp, *ps = pathp, *pa = NULL; | |
793 | int sz; | |
794 | ||
795 | while (*p) { | |
796 | if ((*p) == '@') | |
797 | pa = p; | |
798 | if ((*p) == '/') | |
799 | ps = p + 1; | |
800 | p++; | |
801 | } | |
802 | if (pa < ps) | |
803 | pa = p; | |
804 | sz = (pa - ps) + 1; | |
805 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
806 | __alignof__(struct property)); | |
807 | if (allnextpp) { | |
808 | pp->name = "name"; | |
809 | pp->length = sz; | |
810 | pp->value = (unsigned char *)(pp + 1); | |
811 | *prev_pp = pp; | |
812 | prev_pp = &pp->next; | |
813 | memcpy(pp->value, ps, sz - 1); | |
814 | ((char *)pp->value)[sz - 1] = 0; | |
815 | DBG("fixed up name for %s -> %s\n", pathp, pp->value); | |
816 | } | |
817 | } | |
818 | if (allnextpp) { | |
819 | *prev_pp = NULL; | |
820 | np->name = get_property(np, "name", NULL); | |
821 | np->type = get_property(np, "device_type", NULL); | |
822 | ||
823 | if (!np->name) | |
824 | np->name = "<NULL>"; | |
825 | if (!np->type) | |
826 | np->type = "<NULL>"; | |
827 | } | |
828 | while (tag == OF_DT_BEGIN_NODE) { | |
829 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
830 | tag = *((u32 *)(*p)); | |
831 | } | |
832 | if (tag != OF_DT_END_NODE) { | |
833 | printk("Weird tag at end of node: %x\n", tag); | |
834 | return mem; | |
835 | } | |
836 | *p += 4; | |
837 | return mem; | |
838 | } | |
839 | ||
2babf5c2 ME |
840 | static int __init early_parse_mem(char *p) |
841 | { | |
842 | if (!p) | |
843 | return 1; | |
844 | ||
845 | memory_limit = PAGE_ALIGN(memparse(p, &p)); | |
846 | DBG("memory limit = 0x%lx\n", memory_limit); | |
847 | ||
848 | return 0; | |
849 | } | |
850 | early_param("mem", early_parse_mem); | |
851 | ||
852 | /* | |
853 | * The device tree may be allocated below our memory limit, or inside the | |
854 | * crash kernel region for kdump. If so, move it out now. | |
855 | */ | |
856 | static void move_device_tree(void) | |
857 | { | |
858 | unsigned long start, size; | |
859 | void *p; | |
860 | ||
861 | DBG("-> move_device_tree\n"); | |
862 | ||
863 | start = __pa(initial_boot_params); | |
864 | size = initial_boot_params->totalsize; | |
865 | ||
866 | if ((memory_limit && (start + size) > memory_limit) || | |
867 | overlaps_crashkernel(start, size)) { | |
868 | p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size)); | |
869 | memcpy(p, initial_boot_params, size); | |
870 | initial_boot_params = (struct boot_param_header *)p; | |
871 | DBG("Moved device tree to 0x%p\n", p); | |
872 | } | |
873 | ||
874 | DBG("<- move_device_tree\n"); | |
875 | } | |
9b6b563c PM |
876 | |
877 | /** | |
878 | * unflattens the device-tree passed by the firmware, creating the | |
879 | * tree of struct device_node. It also fills the "name" and "type" | |
880 | * pointers of the nodes so the normal device-tree walking functions | |
881 | * can be used (this used to be done by finish_device_tree) | |
882 | */ | |
883 | void __init unflatten_device_tree(void) | |
884 | { | |
885 | unsigned long start, mem, size; | |
886 | struct device_node **allnextp = &allnodes; | |
9b6b563c PM |
887 | |
888 | DBG(" -> unflatten_device_tree()\n"); | |
889 | ||
890 | /* First pass, scan for size */ | |
891 | start = ((unsigned long)initial_boot_params) + | |
892 | initial_boot_params->off_dt_struct; | |
893 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); | |
894 | size = (size | 3) + 1; | |
895 | ||
896 | DBG(" size is %lx, allocating...\n", size); | |
897 | ||
898 | /* Allocate memory for the expanded device tree */ | |
899 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); | |
9b6b563c PM |
900 | mem = (unsigned long) __va(mem); |
901 | ||
902 | ((u32 *)mem)[size / 4] = 0xdeadbeef; | |
903 | ||
904 | DBG(" unflattening %lx...\n", mem); | |
905 | ||
906 | /* Second pass, do actual unflattening */ | |
907 | start = ((unsigned long)initial_boot_params) + | |
908 | initial_boot_params->off_dt_struct; | |
909 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); | |
910 | if (*((u32 *)start) != OF_DT_END) | |
911 | printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); | |
912 | if (((u32 *)mem)[size / 4] != 0xdeadbeef) | |
913 | printk(KERN_WARNING "End of tree marker overwritten: %08x\n", | |
914 | ((u32 *)mem)[size / 4] ); | |
915 | *allnextp = NULL; | |
916 | ||
917 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
918 | of_chosen = of_find_node_by_path("/chosen"); | |
a575b807 PM |
919 | if (of_chosen == NULL) |
920 | of_chosen = of_find_node_by_path("/chosen@0"); | |
9b6b563c | 921 | |
9b6b563c PM |
922 | DBG(" <- unflatten_device_tree()\n"); |
923 | } | |
924 | ||
d205819e PM |
925 | /* |
926 | * ibm,pa-features is a per-cpu property that contains a string of | |
927 | * attribute descriptors, each of which has a 2 byte header plus up | |
928 | * to 254 bytes worth of processor attribute bits. First header | |
929 | * byte specifies the number of bytes following the header. | |
930 | * Second header byte is an "attribute-specifier" type, of which | |
931 | * zero is the only currently-defined value. | |
932 | * Implementation: Pass in the byte and bit offset for the feature | |
933 | * that we are interested in. The function will return -1 if the | |
934 | * pa-features property is missing, or a 1/0 to indicate if the feature | |
935 | * is supported/not supported. Note that the bit numbers are | |
936 | * big-endian to match the definition in PAPR. | |
937 | */ | |
938 | static struct ibm_pa_feature { | |
939 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ | |
940 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ | |
941 | unsigned char pabyte; /* byte number in ibm,pa-features */ | |
942 | unsigned char pabit; /* bit number (big-endian) */ | |
943 | unsigned char invert; /* if 1, pa bit set => clear feature */ | |
944 | } ibm_pa_features[] __initdata = { | |
945 | {0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, | |
946 | {0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, | |
947 | {CPU_FTR_SLB, 0, 0, 2, 0}, | |
948 | {CPU_FTR_CTRL, 0, 0, 3, 0}, | |
949 | {CPU_FTR_NOEXECUTE, 0, 0, 6, 0}, | |
950 | {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1}, | |
951 | {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, | |
952 | }; | |
953 | ||
954 | static void __init check_cpu_pa_features(unsigned long node) | |
955 | { | |
956 | unsigned char *pa_ftrs; | |
957 | unsigned long len, tablelen, i, bit; | |
958 | ||
959 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); | |
960 | if (pa_ftrs == NULL) | |
961 | return; | |
962 | ||
963 | /* find descriptor with type == 0 */ | |
964 | for (;;) { | |
965 | if (tablelen < 3) | |
966 | return; | |
967 | len = 2 + pa_ftrs[0]; | |
968 | if (tablelen < len) | |
969 | return; /* descriptor 0 not found */ | |
970 | if (pa_ftrs[1] == 0) | |
971 | break; | |
972 | tablelen -= len; | |
973 | pa_ftrs += len; | |
974 | } | |
975 | ||
976 | /* loop over bits we know about */ | |
977 | for (i = 0; i < ARRAY_SIZE(ibm_pa_features); ++i) { | |
978 | struct ibm_pa_feature *fp = &ibm_pa_features[i]; | |
979 | ||
980 | if (fp->pabyte >= pa_ftrs[0]) | |
981 | continue; | |
982 | bit = (pa_ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; | |
983 | if (bit ^ fp->invert) { | |
984 | cur_cpu_spec->cpu_features |= fp->cpu_features; | |
985 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; | |
986 | } else { | |
987 | cur_cpu_spec->cpu_features &= ~fp->cpu_features; | |
988 | cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; | |
989 | } | |
990 | } | |
991 | } | |
992 | ||
9b6b563c | 993 | static int __init early_init_dt_scan_cpus(unsigned long node, |
4df20460 AB |
994 | const char *uname, int depth, |
995 | void *data) | |
9b6b563c | 996 | { |
4df20460 AB |
997 | static int logical_cpuid = 0; |
998 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
4d177fbf SR |
999 | #ifdef CONFIG_ALTIVEC |
1000 | u32 *prop; | |
1001 | #endif | |
1002 | u32 *intserv; | |
4df20460 AB |
1003 | int i, nthreads; |
1004 | unsigned long len; | |
1005 | int found = 0; | |
9b6b563c PM |
1006 | |
1007 | /* We are scanning "cpu" nodes only */ | |
1008 | if (type == NULL || strcmp(type, "cpu") != 0) | |
1009 | return 0; | |
1010 | ||
4df20460 AB |
1011 | /* Get physical cpuid */ |
1012 | intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); | |
1013 | if (intserv) { | |
1014 | nthreads = len / sizeof(int); | |
9b6b563c | 1015 | } else { |
4df20460 AB |
1016 | intserv = of_get_flat_dt_prop(node, "reg", NULL); |
1017 | nthreads = 1; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Now see if any of these threads match our boot cpu. | |
1022 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. | |
1023 | */ | |
1024 | for (i = 0; i < nthreads; i++) { | |
1025 | /* | |
1026 | * version 2 of the kexec param format adds the phys cpuid of | |
1027 | * booted proc. | |
1028 | */ | |
1029 | if (initial_boot_params && initial_boot_params->version >= 2) { | |
1030 | if (intserv[i] == | |
1031 | initial_boot_params->boot_cpuid_phys) { | |
1032 | found = 1; | |
1033 | break; | |
1034 | } | |
1035 | } else { | |
1036 | /* | |
1037 | * Check if it's the boot-cpu, set it's hw index now, | |
1038 | * unfortunately this format did not support booting | |
1039 | * off secondary threads. | |
1040 | */ | |
1041 | if (of_get_flat_dt_prop(node, | |
3c726f8d | 1042 | "linux,boot-cpu", NULL) != NULL) { |
4df20460 AB |
1043 | found = 1; |
1044 | break; | |
1045 | } | |
9b6b563c | 1046 | } |
4df20460 AB |
1047 | |
1048 | #ifdef CONFIG_SMP | |
1049 | /* logical cpu id is always 0 on UP kernels */ | |
1050 | logical_cpuid++; | |
1051 | #endif | |
1052 | } | |
1053 | ||
1054 | if (found) { | |
1055 | DBG("boot cpu: logical %d physical %d\n", logical_cpuid, | |
1056 | intserv[i]); | |
1057 | boot_cpuid = logical_cpuid; | |
1058 | set_hard_smp_processor_id(boot_cpuid, intserv[i]); | |
9b6b563c | 1059 | } |
9b6b563c PM |
1060 | |
1061 | #ifdef CONFIG_ALTIVEC | |
1062 | /* Check if we have a VMX and eventually update CPU features */ | |
676e2497 | 1063 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,vmx", NULL); |
9b6b563c PM |
1064 | if (prop && (*prop) > 0) { |
1065 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
1066 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
1067 | } | |
1068 | ||
1069 | /* Same goes for Apple's "altivec" property */ | |
3c726f8d | 1070 | prop = (u32 *)of_get_flat_dt_prop(node, "altivec", NULL); |
9b6b563c PM |
1071 | if (prop) { |
1072 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
1073 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
1074 | } | |
1075 | #endif /* CONFIG_ALTIVEC */ | |
1076 | ||
d205819e PM |
1077 | check_cpu_pa_features(node); |
1078 | ||
9b6b563c | 1079 | #ifdef CONFIG_PPC_PSERIES |
4df20460 | 1080 | if (nthreads > 1) |
9b6b563c | 1081 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
4df20460 AB |
1082 | else |
1083 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
9b6b563c PM |
1084 | #endif |
1085 | ||
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | static int __init early_init_dt_scan_chosen(unsigned long node, | |
1090 | const char *uname, int depth, void *data) | |
1091 | { | |
9b6b563c | 1092 | unsigned long *lprop; |
329dda08 KG |
1093 | unsigned long l; |
1094 | char *p; | |
9b6b563c PM |
1095 | |
1096 | DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1097 | ||
a575b807 PM |
1098 | if (depth != 1 || |
1099 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
9b6b563c PM |
1100 | return 0; |
1101 | ||
9b6b563c PM |
1102 | #ifdef CONFIG_PPC64 |
1103 | /* check if iommu is forced on or off */ | |
3c726f8d | 1104 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 1105 | iommu_is_off = 1; |
3c726f8d | 1106 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
1107 | iommu_force_on = 1; |
1108 | #endif | |
1109 | ||
2babf5c2 | 1110 | /* mem=x on the command line is the preferred mechanism */ |
3c726f8d | 1111 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
9b6b563c PM |
1112 | if (lprop) |
1113 | memory_limit = *lprop; | |
1114 | ||
1115 | #ifdef CONFIG_PPC64 | |
3c726f8d | 1116 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
9b6b563c PM |
1117 | if (lprop) |
1118 | tce_alloc_start = *lprop; | |
3c726f8d | 1119 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
9b6b563c PM |
1120 | if (lprop) |
1121 | tce_alloc_end = *lprop; | |
1122 | #endif | |
1123 | ||
1124 | #ifdef CONFIG_PPC_RTAS | |
943ffb58 | 1125 | /* To help early debugging via the front panel, we retrieve a minimal |
9b6b563c PM |
1126 | * set of RTAS infos now if available |
1127 | */ | |
1128 | { | |
e8222502 | 1129 | u64 *basep, *entryp, *sizep; |
9b6b563c | 1130 | |
3c726f8d BH |
1131 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
1132 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
e8222502 BH |
1133 | sizep = of_get_flat_dt_prop(node, "linux,rtas-size", NULL); |
1134 | if (basep && entryp && sizep) { | |
9b6b563c PM |
1135 | rtas.base = *basep; |
1136 | rtas.entry = *entryp; | |
e8222502 | 1137 | rtas.size = *sizep; |
9b6b563c PM |
1138 | } |
1139 | } | |
1140 | #endif /* CONFIG_PPC_RTAS */ | |
1141 | ||
dcee3036 ME |
1142 | #ifdef CONFIG_KEXEC |
1143 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); | |
1144 | if (lprop) | |
1145 | crashk_res.start = *lprop; | |
1146 | ||
1147 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); | |
1148 | if (lprop) | |
1149 | crashk_res.end = crashk_res.start + *lprop - 1; | |
1150 | #endif | |
1151 | ||
329dda08 KG |
1152 | /* Retreive command line */ |
1153 | p = of_get_flat_dt_prop(node, "bootargs", &l); | |
1154 | if (p != NULL && l > 0) | |
1155 | strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); | |
1156 | ||
1157 | #ifdef CONFIG_CMDLINE | |
1158 | if (l == 0 || (l == 1 && (*p) == 0)) | |
1159 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1160 | #endif /* CONFIG_CMDLINE */ | |
1161 | ||
1162 | DBG("Command line is: %s\n", cmd_line); | |
1163 | ||
9b6b563c PM |
1164 | /* break now */ |
1165 | return 1; | |
1166 | } | |
1167 | ||
1168 | static int __init early_init_dt_scan_root(unsigned long node, | |
1169 | const char *uname, int depth, void *data) | |
1170 | { | |
1171 | u32 *prop; | |
1172 | ||
1173 | if (depth != 0) | |
1174 | return 0; | |
1175 | ||
3c726f8d | 1176 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
9b6b563c PM |
1177 | dt_root_size_cells = (prop == NULL) ? 1 : *prop; |
1178 | DBG("dt_root_size_cells = %x\n", dt_root_size_cells); | |
1179 | ||
3c726f8d | 1180 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
9b6b563c PM |
1181 | dt_root_addr_cells = (prop == NULL) ? 2 : *prop; |
1182 | DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); | |
1183 | ||
1184 | /* break now */ | |
1185 | return 1; | |
1186 | } | |
1187 | ||
1188 | static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) | |
1189 | { | |
1190 | cell_t *p = *cellp; | |
1191 | unsigned long r; | |
1192 | ||
1193 | /* Ignore more than 2 cells */ | |
1194 | while (s > sizeof(unsigned long) / 4) { | |
1195 | p++; | |
1196 | s--; | |
1197 | } | |
1198 | r = *p++; | |
1199 | #ifdef CONFIG_PPC64 | |
1200 | if (s > 1) { | |
1201 | r <<= 32; | |
1202 | r |= *(p++); | |
1203 | s--; | |
1204 | } | |
1205 | #endif | |
1206 | ||
1207 | *cellp = p; | |
1208 | return r; | |
1209 | } | |
1210 | ||
1211 | ||
1212 | static int __init early_init_dt_scan_memory(unsigned long node, | |
1213 | const char *uname, int depth, void *data) | |
1214 | { | |
3c726f8d | 1215 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
9b6b563c PM |
1216 | cell_t *reg, *endp; |
1217 | unsigned long l; | |
1218 | ||
1219 | /* We are scanning "memory" nodes only */ | |
a23414be PM |
1220 | if (type == NULL) { |
1221 | /* | |
1222 | * The longtrail doesn't have a device_type on the | |
1223 | * /memory node, so look for the node called /memory@0. | |
1224 | */ | |
1225 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
1226 | return 0; | |
1227 | } else if (strcmp(type, "memory") != 0) | |
9b6b563c PM |
1228 | return 0; |
1229 | ||
ba759485 ME |
1230 | reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
1231 | if (reg == NULL) | |
1232 | reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); | |
9b6b563c PM |
1233 | if (reg == NULL) |
1234 | return 0; | |
1235 | ||
1236 | endp = reg + (l / sizeof(cell_t)); | |
1237 | ||
358c86fd | 1238 | DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
9b6b563c PM |
1239 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
1240 | ||
1241 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1242 | unsigned long base, size; | |
1243 | ||
1244 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1245 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1246 | ||
1247 | if (size == 0) | |
1248 | continue; | |
1249 | DBG(" - %lx , %lx\n", base, size); | |
1250 | #ifdef CONFIG_PPC64 | |
1251 | if (iommu_is_off) { | |
1252 | if (base >= 0x80000000ul) | |
1253 | continue; | |
1254 | if ((base + size) > 0x80000000ul) | |
1255 | size = 0x80000000ul - base; | |
1256 | } | |
1257 | #endif | |
1258 | lmb_add(base, size); | |
1259 | } | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static void __init early_reserve_mem(void) | |
1264 | { | |
cbbcf340 KG |
1265 | u64 base, size; |
1266 | u64 *reserve_map; | |
9b6b563c | 1267 | |
cbbcf340 | 1268 | reserve_map = (u64 *)(((unsigned long)initial_boot_params) + |
9b6b563c | 1269 | initial_boot_params->off_mem_rsvmap); |
4d1f3f25 JX |
1270 | |
1271 | /* before we do anything, lets reserve the dt blob */ | |
1272 | lmb_reserve(__pa((unsigned long)initial_boot_params), | |
1273 | initial_boot_params->totalsize); | |
1274 | ||
cbbcf340 KG |
1275 | #ifdef CONFIG_PPC32 |
1276 | /* | |
1277 | * Handle the case where we might be booting from an old kexec | |
1278 | * image that setup the mem_rsvmap as pairs of 32-bit values | |
1279 | */ | |
1280 | if (*reserve_map > 0xffffffffull) { | |
1281 | u32 base_32, size_32; | |
1282 | u32 *reserve_map_32 = (u32 *)reserve_map; | |
1283 | ||
1284 | while (1) { | |
1285 | base_32 = *(reserve_map_32++); | |
1286 | size_32 = *(reserve_map_32++); | |
1287 | if (size_32 == 0) | |
1288 | break; | |
329dda08 | 1289 | DBG("reserving: %x -> %x\n", base_32, size_32); |
cbbcf340 KG |
1290 | lmb_reserve(base_32, size_32); |
1291 | } | |
1292 | return; | |
1293 | } | |
1294 | #endif | |
9b6b563c PM |
1295 | while (1) { |
1296 | base = *(reserve_map++); | |
1297 | size = *(reserve_map++); | |
1298 | if (size == 0) | |
1299 | break; | |
cbbcf340 | 1300 | DBG("reserving: %llx -> %llx\n", base, size); |
9b6b563c PM |
1301 | lmb_reserve(base, size); |
1302 | } | |
1303 | ||
1304 | #if 0 | |
1305 | DBG("memory reserved, lmbs :\n"); | |
1306 | lmb_dump_all(); | |
1307 | #endif | |
1308 | } | |
1309 | ||
1310 | void __init early_init_devtree(void *params) | |
1311 | { | |
1312 | DBG(" -> early_init_devtree()\n"); | |
1313 | ||
1314 | /* Setup flat device-tree pointer */ | |
1315 | initial_boot_params = params; | |
1316 | ||
1317 | /* Retrieve various informations from the /chosen node of the | |
1318 | * device-tree, including the platform type, initrd location and | |
1319 | * size, TCE reserve, and more ... | |
1320 | */ | |
3c726f8d | 1321 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
9b6b563c PM |
1322 | |
1323 | /* Scan memory nodes and rebuild LMBs */ | |
1324 | lmb_init(); | |
3c726f8d BH |
1325 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
1326 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
846f77b0 ME |
1327 | |
1328 | /* Save command line for /proc/cmdline and then parse parameters */ | |
1329 | strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); | |
1330 | parse_early_param(); | |
1331 | ||
9b6b563c | 1332 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ |
0cc4746c | 1333 | lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); |
47310413 | 1334 | reserve_kdump_trampoline(); |
35dd5432 | 1335 | reserve_crashkernel(); |
9b6b563c PM |
1336 | early_reserve_mem(); |
1337 | ||
2babf5c2 ME |
1338 | lmb_enforce_memory_limit(memory_limit); |
1339 | lmb_analyze(); | |
1340 | ||
1341 | DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); | |
1342 | ||
1343 | /* We may need to relocate the flat tree, do it now. | |
1344 | * FIXME .. and the initrd too? */ | |
1345 | move_device_tree(); | |
1346 | ||
9b6b563c PM |
1347 | DBG("Scanning CPUs ...\n"); |
1348 | ||
3c726f8d BH |
1349 | /* Retreive CPU related informations from the flat tree |
1350 | * (altivec support, boot CPU ID, ...) | |
9b6b563c | 1351 | */ |
3c726f8d | 1352 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
9b6b563c | 1353 | |
9b6b563c PM |
1354 | DBG(" <- early_init_devtree()\n"); |
1355 | } | |
1356 | ||
1357 | #undef printk | |
1358 | ||
1359 | int | |
1360 | prom_n_addr_cells(struct device_node* np) | |
1361 | { | |
1362 | int* ip; | |
1363 | do { | |
1364 | if (np->parent) | |
1365 | np = np->parent; | |
1366 | ip = (int *) get_property(np, "#address-cells", NULL); | |
1367 | if (ip != NULL) | |
1368 | return *ip; | |
1369 | } while (np->parent); | |
1370 | /* No #address-cells property for the root node, default to 1 */ | |
1371 | return 1; | |
1372 | } | |
1dfc6772 | 1373 | EXPORT_SYMBOL(prom_n_addr_cells); |
9b6b563c PM |
1374 | |
1375 | int | |
1376 | prom_n_size_cells(struct device_node* np) | |
1377 | { | |
1378 | int* ip; | |
1379 | do { | |
1380 | if (np->parent) | |
1381 | np = np->parent; | |
1382 | ip = (int *) get_property(np, "#size-cells", NULL); | |
1383 | if (ip != NULL) | |
1384 | return *ip; | |
1385 | } while (np->parent); | |
1386 | /* No #size-cells property for the root node, default to 1 */ | |
1387 | return 1; | |
1388 | } | |
1dfc6772 | 1389 | EXPORT_SYMBOL(prom_n_size_cells); |
9b6b563c PM |
1390 | |
1391 | /** | |
1392 | * Work out the sense (active-low level / active-high edge) | |
1393 | * of each interrupt from the device tree. | |
1394 | */ | |
1395 | void __init prom_get_irq_senses(unsigned char *senses, int off, int max) | |
1396 | { | |
1397 | struct device_node *np; | |
1398 | int i, j; | |
1399 | ||
1400 | /* default to level-triggered */ | |
6d0124fc | 1401 | memset(senses, IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, max - off); |
9b6b563c PM |
1402 | |
1403 | for (np = allnodes; np != 0; np = np->allnext) { | |
1404 | for (j = 0; j < np->n_intrs; j++) { | |
1405 | i = np->intrs[j].line; | |
1406 | if (i >= off && i < max) | |
6d0124fc | 1407 | senses[i-off] = np->intrs[j].sense; |
9b6b563c PM |
1408 | } |
1409 | } | |
1410 | } | |
1411 | ||
1412 | /** | |
1413 | * Construct and return a list of the device_nodes with a given name. | |
1414 | */ | |
1415 | struct device_node *find_devices(const char *name) | |
1416 | { | |
1417 | struct device_node *head, **prevp, *np; | |
1418 | ||
1419 | prevp = &head; | |
1420 | for (np = allnodes; np != 0; np = np->allnext) { | |
1421 | if (np->name != 0 && strcasecmp(np->name, name) == 0) { | |
1422 | *prevp = np; | |
1423 | prevp = &np->next; | |
1424 | } | |
1425 | } | |
1426 | *prevp = NULL; | |
1427 | return head; | |
1428 | } | |
1429 | EXPORT_SYMBOL(find_devices); | |
1430 | ||
1431 | /** | |
1432 | * Construct and return a list of the device_nodes with a given type. | |
1433 | */ | |
1434 | struct device_node *find_type_devices(const char *type) | |
1435 | { | |
1436 | struct device_node *head, **prevp, *np; | |
1437 | ||
1438 | prevp = &head; | |
1439 | for (np = allnodes; np != 0; np = np->allnext) { | |
1440 | if (np->type != 0 && strcasecmp(np->type, type) == 0) { | |
1441 | *prevp = np; | |
1442 | prevp = &np->next; | |
1443 | } | |
1444 | } | |
1445 | *prevp = NULL; | |
1446 | return head; | |
1447 | } | |
1448 | EXPORT_SYMBOL(find_type_devices); | |
1449 | ||
1450 | /** | |
1451 | * Returns all nodes linked together | |
1452 | */ | |
1453 | struct device_node *find_all_nodes(void) | |
1454 | { | |
1455 | struct device_node *head, **prevp, *np; | |
1456 | ||
1457 | prevp = &head; | |
1458 | for (np = allnodes; np != 0; np = np->allnext) { | |
1459 | *prevp = np; | |
1460 | prevp = &np->next; | |
1461 | } | |
1462 | *prevp = NULL; | |
1463 | return head; | |
1464 | } | |
1465 | EXPORT_SYMBOL(find_all_nodes); | |
1466 | ||
1467 | /** Checks if the given "compat" string matches one of the strings in | |
1468 | * the device's "compatible" property | |
1469 | */ | |
1470 | int device_is_compatible(struct device_node *device, const char *compat) | |
1471 | { | |
1472 | const char* cp; | |
1473 | int cplen, l; | |
1474 | ||
1475 | cp = (char *) get_property(device, "compatible", &cplen); | |
1476 | if (cp == NULL) | |
1477 | return 0; | |
1478 | while (cplen > 0) { | |
1479 | if (strncasecmp(cp, compat, strlen(compat)) == 0) | |
1480 | return 1; | |
1481 | l = strlen(cp) + 1; | |
1482 | cp += l; | |
1483 | cplen -= l; | |
1484 | } | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | EXPORT_SYMBOL(device_is_compatible); | |
1489 | ||
1490 | ||
1491 | /** | |
1492 | * Indicates whether the root node has a given value in its | |
1493 | * compatible property. | |
1494 | */ | |
1495 | int machine_is_compatible(const char *compat) | |
1496 | { | |
1497 | struct device_node *root; | |
1498 | int rc = 0; | |
1499 | ||
1500 | root = of_find_node_by_path("/"); | |
1501 | if (root) { | |
1502 | rc = device_is_compatible(root, compat); | |
1503 | of_node_put(root); | |
1504 | } | |
1505 | return rc; | |
1506 | } | |
1507 | EXPORT_SYMBOL(machine_is_compatible); | |
1508 | ||
1509 | /** | |
1510 | * Construct and return a list of the device_nodes with a given type | |
1511 | * and compatible property. | |
1512 | */ | |
1513 | struct device_node *find_compatible_devices(const char *type, | |
1514 | const char *compat) | |
1515 | { | |
1516 | struct device_node *head, **prevp, *np; | |
1517 | ||
1518 | prevp = &head; | |
1519 | for (np = allnodes; np != 0; np = np->allnext) { | |
1520 | if (type != NULL | |
1521 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) | |
1522 | continue; | |
1523 | if (device_is_compatible(np, compat)) { | |
1524 | *prevp = np; | |
1525 | prevp = &np->next; | |
1526 | } | |
1527 | } | |
1528 | *prevp = NULL; | |
1529 | return head; | |
1530 | } | |
1531 | EXPORT_SYMBOL(find_compatible_devices); | |
1532 | ||
1533 | /** | |
1534 | * Find the device_node with a given full_name. | |
1535 | */ | |
1536 | struct device_node *find_path_device(const char *path) | |
1537 | { | |
1538 | struct device_node *np; | |
1539 | ||
1540 | for (np = allnodes; np != 0; np = np->allnext) | |
1541 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0) | |
1542 | return np; | |
1543 | return NULL; | |
1544 | } | |
1545 | EXPORT_SYMBOL(find_path_device); | |
1546 | ||
1547 | /******* | |
1548 | * | |
1549 | * New implementation of the OF "find" APIs, return a refcounted | |
1550 | * object, call of_node_put() when done. The device tree and list | |
1551 | * are protected by a rw_lock. | |
1552 | * | |
1553 | * Note that property management will need some locking as well, | |
1554 | * this isn't dealt with yet. | |
1555 | * | |
1556 | *******/ | |
1557 | ||
1558 | /** | |
1559 | * of_find_node_by_name - Find a node by its "name" property | |
1560 | * @from: The node to start searching from or NULL, the node | |
1561 | * you pass will not be searched, only the next one | |
1562 | * will; typically, you pass what the previous call | |
1563 | * returned. of_node_put() will be called on it | |
1564 | * @name: The name string to match against | |
1565 | * | |
1566 | * Returns a node pointer with refcount incremented, use | |
1567 | * of_node_put() on it when done. | |
1568 | */ | |
1569 | struct device_node *of_find_node_by_name(struct device_node *from, | |
1570 | const char *name) | |
1571 | { | |
1572 | struct device_node *np; | |
1573 | ||
1574 | read_lock(&devtree_lock); | |
1575 | np = from ? from->allnext : allnodes; | |
090db7c8 OH |
1576 | for (; np != NULL; np = np->allnext) |
1577 | if (np->name != NULL && strcasecmp(np->name, name) == 0 | |
9b6b563c PM |
1578 | && of_node_get(np)) |
1579 | break; | |
1580 | if (from) | |
1581 | of_node_put(from); | |
1582 | read_unlock(&devtree_lock); | |
1583 | return np; | |
1584 | } | |
1585 | EXPORT_SYMBOL(of_find_node_by_name); | |
1586 | ||
1587 | /** | |
1588 | * of_find_node_by_type - Find a node by its "device_type" property | |
1589 | * @from: The node to start searching from or NULL, the node | |
1590 | * you pass will not be searched, only the next one | |
1591 | * will; typically, you pass what the previous call | |
1592 | * returned. of_node_put() will be called on it | |
1593 | * @name: The type string to match against | |
1594 | * | |
1595 | * Returns a node pointer with refcount incremented, use | |
1596 | * of_node_put() on it when done. | |
1597 | */ | |
1598 | struct device_node *of_find_node_by_type(struct device_node *from, | |
1599 | const char *type) | |
1600 | { | |
1601 | struct device_node *np; | |
1602 | ||
1603 | read_lock(&devtree_lock); | |
1604 | np = from ? from->allnext : allnodes; | |
1605 | for (; np != 0; np = np->allnext) | |
1606 | if (np->type != 0 && strcasecmp(np->type, type) == 0 | |
1607 | && of_node_get(np)) | |
1608 | break; | |
1609 | if (from) | |
1610 | of_node_put(from); | |
1611 | read_unlock(&devtree_lock); | |
1612 | return np; | |
1613 | } | |
1614 | EXPORT_SYMBOL(of_find_node_by_type); | |
1615 | ||
1616 | /** | |
1617 | * of_find_compatible_node - Find a node based on type and one of the | |
1618 | * tokens in its "compatible" property | |
1619 | * @from: The node to start searching from or NULL, the node | |
1620 | * you pass will not be searched, only the next one | |
1621 | * will; typically, you pass what the previous call | |
1622 | * returned. of_node_put() will be called on it | |
1623 | * @type: The type string to match "device_type" or NULL to ignore | |
1624 | * @compatible: The string to match to one of the tokens in the device | |
1625 | * "compatible" list. | |
1626 | * | |
1627 | * Returns a node pointer with refcount incremented, use | |
1628 | * of_node_put() on it when done. | |
1629 | */ | |
1630 | struct device_node *of_find_compatible_node(struct device_node *from, | |
1631 | const char *type, const char *compatible) | |
1632 | { | |
1633 | struct device_node *np; | |
1634 | ||
1635 | read_lock(&devtree_lock); | |
1636 | np = from ? from->allnext : allnodes; | |
1637 | for (; np != 0; np = np->allnext) { | |
1638 | if (type != NULL | |
1639 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) | |
1640 | continue; | |
1641 | if (device_is_compatible(np, compatible) && of_node_get(np)) | |
1642 | break; | |
1643 | } | |
1644 | if (from) | |
1645 | of_node_put(from); | |
1646 | read_unlock(&devtree_lock); | |
1647 | return np; | |
1648 | } | |
1649 | EXPORT_SYMBOL(of_find_compatible_node); | |
1650 | ||
1651 | /** | |
1652 | * of_find_node_by_path - Find a node matching a full OF path | |
1653 | * @path: The full path to match | |
1654 | * | |
1655 | * Returns a node pointer with refcount incremented, use | |
1656 | * of_node_put() on it when done. | |
1657 | */ | |
1658 | struct device_node *of_find_node_by_path(const char *path) | |
1659 | { | |
1660 | struct device_node *np = allnodes; | |
1661 | ||
1662 | read_lock(&devtree_lock); | |
1663 | for (; np != 0; np = np->allnext) { | |
1664 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0 | |
1665 | && of_node_get(np)) | |
1666 | break; | |
1667 | } | |
1668 | read_unlock(&devtree_lock); | |
1669 | return np; | |
1670 | } | |
1671 | EXPORT_SYMBOL(of_find_node_by_path); | |
1672 | ||
1673 | /** | |
1674 | * of_find_node_by_phandle - Find a node given a phandle | |
1675 | * @handle: phandle of the node to find | |
1676 | * | |
1677 | * Returns a node pointer with refcount incremented, use | |
1678 | * of_node_put() on it when done. | |
1679 | */ | |
1680 | struct device_node *of_find_node_by_phandle(phandle handle) | |
1681 | { | |
1682 | struct device_node *np; | |
1683 | ||
1684 | read_lock(&devtree_lock); | |
1685 | for (np = allnodes; np != 0; np = np->allnext) | |
1686 | if (np->linux_phandle == handle) | |
1687 | break; | |
1688 | if (np) | |
1689 | of_node_get(np); | |
1690 | read_unlock(&devtree_lock); | |
1691 | return np; | |
1692 | } | |
1693 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
1694 | ||
1695 | /** | |
1696 | * of_find_all_nodes - Get next node in global list | |
1697 | * @prev: Previous node or NULL to start iteration | |
1698 | * of_node_put() will be called on it | |
1699 | * | |
1700 | * Returns a node pointer with refcount incremented, use | |
1701 | * of_node_put() on it when done. | |
1702 | */ | |
1703 | struct device_node *of_find_all_nodes(struct device_node *prev) | |
1704 | { | |
1705 | struct device_node *np; | |
1706 | ||
1707 | read_lock(&devtree_lock); | |
1708 | np = prev ? prev->allnext : allnodes; | |
1709 | for (; np != 0; np = np->allnext) | |
1710 | if (of_node_get(np)) | |
1711 | break; | |
1712 | if (prev) | |
1713 | of_node_put(prev); | |
1714 | read_unlock(&devtree_lock); | |
1715 | return np; | |
1716 | } | |
1717 | EXPORT_SYMBOL(of_find_all_nodes); | |
1718 | ||
1719 | /** | |
1720 | * of_get_parent - Get a node's parent if any | |
1721 | * @node: Node to get parent | |
1722 | * | |
1723 | * Returns a node pointer with refcount incremented, use | |
1724 | * of_node_put() on it when done. | |
1725 | */ | |
1726 | struct device_node *of_get_parent(const struct device_node *node) | |
1727 | { | |
1728 | struct device_node *np; | |
1729 | ||
1730 | if (!node) | |
1731 | return NULL; | |
1732 | ||
1733 | read_lock(&devtree_lock); | |
1734 | np = of_node_get(node->parent); | |
1735 | read_unlock(&devtree_lock); | |
1736 | return np; | |
1737 | } | |
1738 | EXPORT_SYMBOL(of_get_parent); | |
1739 | ||
1740 | /** | |
1741 | * of_get_next_child - Iterate a node childs | |
1742 | * @node: parent node | |
1743 | * @prev: previous child of the parent node, or NULL to get first | |
1744 | * | |
1745 | * Returns a node pointer with refcount incremented, use | |
1746 | * of_node_put() on it when done. | |
1747 | */ | |
1748 | struct device_node *of_get_next_child(const struct device_node *node, | |
1749 | struct device_node *prev) | |
1750 | { | |
1751 | struct device_node *next; | |
1752 | ||
1753 | read_lock(&devtree_lock); | |
1754 | next = prev ? prev->sibling : node->child; | |
1755 | for (; next != 0; next = next->sibling) | |
1756 | if (of_node_get(next)) | |
1757 | break; | |
1758 | if (prev) | |
1759 | of_node_put(prev); | |
1760 | read_unlock(&devtree_lock); | |
1761 | return next; | |
1762 | } | |
1763 | EXPORT_SYMBOL(of_get_next_child); | |
1764 | ||
1765 | /** | |
1766 | * of_node_get - Increment refcount of a node | |
1767 | * @node: Node to inc refcount, NULL is supported to | |
1768 | * simplify writing of callers | |
1769 | * | |
1770 | * Returns node. | |
1771 | */ | |
1772 | struct device_node *of_node_get(struct device_node *node) | |
1773 | { | |
1774 | if (node) | |
1775 | kref_get(&node->kref); | |
1776 | return node; | |
1777 | } | |
1778 | EXPORT_SYMBOL(of_node_get); | |
1779 | ||
1780 | static inline struct device_node * kref_to_device_node(struct kref *kref) | |
1781 | { | |
1782 | return container_of(kref, struct device_node, kref); | |
1783 | } | |
1784 | ||
1785 | /** | |
1786 | * of_node_release - release a dynamically allocated node | |
1787 | * @kref: kref element of the node to be released | |
1788 | * | |
1789 | * In of_node_put() this function is passed to kref_put() | |
1790 | * as the destructor. | |
1791 | */ | |
1792 | static void of_node_release(struct kref *kref) | |
1793 | { | |
1794 | struct device_node *node = kref_to_device_node(kref); | |
1795 | struct property *prop = node->properties; | |
1796 | ||
1797 | if (!OF_IS_DYNAMIC(node)) | |
1798 | return; | |
1799 | while (prop) { | |
1800 | struct property *next = prop->next; | |
1801 | kfree(prop->name); | |
1802 | kfree(prop->value); | |
1803 | kfree(prop); | |
1804 | prop = next; | |
088186de DB |
1805 | |
1806 | if (!prop) { | |
1807 | prop = node->deadprops; | |
1808 | node->deadprops = NULL; | |
1809 | } | |
9b6b563c PM |
1810 | } |
1811 | kfree(node->intrs); | |
9b6b563c PM |
1812 | kfree(node->full_name); |
1813 | kfree(node->data); | |
1814 | kfree(node); | |
1815 | } | |
1816 | ||
1817 | /** | |
1818 | * of_node_put - Decrement refcount of a node | |
1819 | * @node: Node to dec refcount, NULL is supported to | |
1820 | * simplify writing of callers | |
1821 | * | |
1822 | */ | |
1823 | void of_node_put(struct device_node *node) | |
1824 | { | |
1825 | if (node) | |
1826 | kref_put(&node->kref, of_node_release); | |
1827 | } | |
1828 | EXPORT_SYMBOL(of_node_put); | |
1829 | ||
1830 | /* | |
1831 | * Plug a device node into the tree and global list. | |
1832 | */ | |
1833 | void of_attach_node(struct device_node *np) | |
1834 | { | |
1835 | write_lock(&devtree_lock); | |
1836 | np->sibling = np->parent->child; | |
1837 | np->allnext = allnodes; | |
1838 | np->parent->child = np; | |
1839 | allnodes = np; | |
1840 | write_unlock(&devtree_lock); | |
1841 | } | |
1842 | ||
1843 | /* | |
1844 | * "Unplug" a node from the device tree. The caller must hold | |
1845 | * a reference to the node. The memory associated with the node | |
1846 | * is not freed until its refcount goes to zero. | |
1847 | */ | |
1848 | void of_detach_node(const struct device_node *np) | |
1849 | { | |
1850 | struct device_node *parent; | |
1851 | ||
1852 | write_lock(&devtree_lock); | |
1853 | ||
1854 | parent = np->parent; | |
1855 | ||
1856 | if (allnodes == np) | |
1857 | allnodes = np->allnext; | |
1858 | else { | |
1859 | struct device_node *prev; | |
1860 | for (prev = allnodes; | |
1861 | prev->allnext != np; | |
1862 | prev = prev->allnext) | |
1863 | ; | |
1864 | prev->allnext = np->allnext; | |
1865 | } | |
1866 | ||
1867 | if (parent->child == np) | |
1868 | parent->child = np->sibling; | |
1869 | else { | |
1870 | struct device_node *prevsib; | |
1871 | for (prevsib = np->parent->child; | |
1872 | prevsib->sibling != np; | |
1873 | prevsib = prevsib->sibling) | |
1874 | ; | |
1875 | prevsib->sibling = np->sibling; | |
1876 | } | |
1877 | ||
1878 | write_unlock(&devtree_lock); | |
1879 | } | |
1880 | ||
1881 | #ifdef CONFIG_PPC_PSERIES | |
1882 | /* | |
1883 | * Fix up the uninitialized fields in a new device node: | |
1884 | * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields | |
1885 | * | |
1886 | * A lot of boot-time code is duplicated here, because functions such | |
1887 | * as finish_node_interrupts, interpret_pci_props, etc. cannot use the | |
1888 | * slab allocator. | |
1889 | * | |
1890 | * This should probably be split up into smaller chunks. | |
1891 | */ | |
1892 | ||
cc5d0189 | 1893 | static int of_finish_dynamic_node(struct device_node *node) |
9b6b563c PM |
1894 | { |
1895 | struct device_node *parent = of_get_parent(node); | |
1896 | int err = 0; | |
1897 | phandle *ibm_phandle; | |
1898 | ||
1899 | node->name = get_property(node, "name", NULL); | |
1900 | node->type = get_property(node, "device_type", NULL); | |
1901 | ||
1902 | if (!parent) { | |
1903 | err = -ENODEV; | |
1904 | goto out; | |
1905 | } | |
1906 | ||
1907 | /* We don't support that function on PowerMac, at least | |
1908 | * not yet | |
1909 | */ | |
e8222502 | 1910 | if (machine_is(powermac)) |
9b6b563c PM |
1911 | return -ENODEV; |
1912 | ||
1913 | /* fix up new node's linux_phandle field */ | |
cc5d0189 BH |
1914 | if ((ibm_phandle = (unsigned int *)get_property(node, |
1915 | "ibm,phandle", NULL))) | |
9b6b563c PM |
1916 | node->linux_phandle = *ibm_phandle; |
1917 | ||
1918 | out: | |
1919 | of_node_put(parent); | |
1920 | return err; | |
1921 | } | |
1922 | ||
1923 | static int prom_reconfig_notifier(struct notifier_block *nb, | |
1924 | unsigned long action, void *node) | |
1925 | { | |
1926 | int err; | |
1927 | ||
1928 | switch (action) { | |
1929 | case PSERIES_RECONFIG_ADD: | |
cc5d0189 BH |
1930 | err = of_finish_dynamic_node(node); |
1931 | if (!err) | |
1932 | finish_node(node, NULL, 0); | |
9b6b563c PM |
1933 | if (err < 0) { |
1934 | printk(KERN_ERR "finish_node returned %d\n", err); | |
1935 | err = NOTIFY_BAD; | |
1936 | } | |
1937 | break; | |
1938 | default: | |
1939 | err = NOTIFY_DONE; | |
1940 | break; | |
1941 | } | |
1942 | return err; | |
1943 | } | |
1944 | ||
1945 | static struct notifier_block prom_reconfig_nb = { | |
1946 | .notifier_call = prom_reconfig_notifier, | |
1947 | .priority = 10, /* This one needs to run first */ | |
1948 | }; | |
1949 | ||
1950 | static int __init prom_reconfig_setup(void) | |
1951 | { | |
1952 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); | |
1953 | } | |
1954 | __initcall(prom_reconfig_setup); | |
1955 | #endif | |
1956 | ||
ecaa8b0f DB |
1957 | struct property *of_find_property(struct device_node *np, const char *name, |
1958 | int *lenp) | |
9b6b563c PM |
1959 | { |
1960 | struct property *pp; | |
1961 | ||
088186de | 1962 | read_lock(&devtree_lock); |
9b6b563c PM |
1963 | for (pp = np->properties; pp != 0; pp = pp->next) |
1964 | if (strcmp(pp->name, name) == 0) { | |
1965 | if (lenp != 0) | |
1966 | *lenp = pp->length; | |
088186de | 1967 | break; |
9b6b563c | 1968 | } |
088186de DB |
1969 | read_unlock(&devtree_lock); |
1970 | ||
ecaa8b0f DB |
1971 | return pp; |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * Find a property with a given name for a given node | |
1976 | * and return the value. | |
1977 | */ | |
1978 | unsigned char *get_property(struct device_node *np, const char *name, | |
1979 | int *lenp) | |
1980 | { | |
1981 | struct property *pp = of_find_property(np,name,lenp); | |
088186de | 1982 | return pp ? pp->value : NULL; |
9b6b563c PM |
1983 | } |
1984 | EXPORT_SYMBOL(get_property); | |
1985 | ||
1986 | /* | |
1987 | * Add a property to a node | |
1988 | */ | |
183d0202 | 1989 | int prom_add_property(struct device_node* np, struct property* prop) |
9b6b563c | 1990 | { |
183d0202 | 1991 | struct property **next; |
9b6b563c PM |
1992 | |
1993 | prop->next = NULL; | |
183d0202 BH |
1994 | write_lock(&devtree_lock); |
1995 | next = &np->properties; | |
1996 | while (*next) { | |
1997 | if (strcmp(prop->name, (*next)->name) == 0) { | |
1998 | /* duplicate ! don't insert it */ | |
1999 | write_unlock(&devtree_lock); | |
2000 | return -1; | |
2001 | } | |
9b6b563c | 2002 | next = &(*next)->next; |
183d0202 | 2003 | } |
9b6b563c | 2004 | *next = prop; |
183d0202 BH |
2005 | write_unlock(&devtree_lock); |
2006 | ||
799d6046 | 2007 | #ifdef CONFIG_PROC_DEVICETREE |
183d0202 BH |
2008 | /* try to add to proc as well if it was initialized */ |
2009 | if (np->pde) | |
2010 | proc_device_tree_add_prop(np->pde, prop); | |
799d6046 | 2011 | #endif /* CONFIG_PROC_DEVICETREE */ |
183d0202 BH |
2012 | |
2013 | return 0; | |
9b6b563c PM |
2014 | } |
2015 | ||
088186de DB |
2016 | /* |
2017 | * Remove a property from a node. Note that we don't actually | |
2018 | * remove it, since we have given out who-knows-how-many pointers | |
2019 | * to the data using get-property. Instead we just move the property | |
2020 | * to the "dead properties" list, so it won't be found any more. | |
2021 | */ | |
2022 | int prom_remove_property(struct device_node *np, struct property *prop) | |
2023 | { | |
2024 | struct property **next; | |
2025 | int found = 0; | |
2026 | ||
2027 | write_lock(&devtree_lock); | |
2028 | next = &np->properties; | |
2029 | while (*next) { | |
2030 | if (*next == prop) { | |
2031 | /* found the node */ | |
2032 | *next = prop->next; | |
2033 | prop->next = np->deadprops; | |
2034 | np->deadprops = prop; | |
2035 | found = 1; | |
2036 | break; | |
2037 | } | |
2038 | next = &(*next)->next; | |
2039 | } | |
2040 | write_unlock(&devtree_lock); | |
2041 | ||
2042 | if (!found) | |
2043 | return -ENODEV; | |
2044 | ||
2045 | #ifdef CONFIG_PROC_DEVICETREE | |
2046 | /* try to remove the proc node as well */ | |
2047 | if (np->pde) | |
2048 | proc_device_tree_remove_prop(np->pde, prop); | |
2049 | #endif /* CONFIG_PROC_DEVICETREE */ | |
2050 | ||
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * Update a property in a node. Note that we don't actually | |
2056 | * remove it, since we have given out who-knows-how-many pointers | |
2057 | * to the data using get-property. Instead we just move the property | |
2058 | * to the "dead properties" list, and add the new property to the | |
2059 | * property list | |
2060 | */ | |
2061 | int prom_update_property(struct device_node *np, | |
2062 | struct property *newprop, | |
2063 | struct property *oldprop) | |
2064 | { | |
2065 | struct property **next; | |
2066 | int found = 0; | |
2067 | ||
2068 | write_lock(&devtree_lock); | |
2069 | next = &np->properties; | |
2070 | while (*next) { | |
2071 | if (*next == oldprop) { | |
2072 | /* found the node */ | |
2073 | newprop->next = oldprop->next; | |
2074 | *next = newprop; | |
2075 | oldprop->next = np->deadprops; | |
2076 | np->deadprops = oldprop; | |
2077 | found = 1; | |
2078 | break; | |
2079 | } | |
2080 | next = &(*next)->next; | |
2081 | } | |
2082 | write_unlock(&devtree_lock); | |
2083 | ||
2084 | if (!found) | |
2085 | return -ENODEV; | |
9b6b563c | 2086 | |
088186de DB |
2087 | #ifdef CONFIG_PROC_DEVICETREE |
2088 | /* try to add to proc as well if it was initialized */ | |
2089 | if (np->pde) | |
2090 | proc_device_tree_update_prop(np->pde, newprop, oldprop); | |
2091 | #endif /* CONFIG_PROC_DEVICETREE */ | |
2092 | ||
2093 | return 0; | |
2094 | } | |
b68239ee | 2095 |