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> | |
32 | ||
33 | #include <asm/prom.h> | |
34 | #include <asm/rtas.h> | |
35 | #include <asm/lmb.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/processor.h> | |
38 | #include <asm/irq.h> | |
39 | #include <asm/io.h> | |
40 | #include <asm/smp.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/mmu.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/pci.h> | |
45 | #include <asm/iommu.h> | |
46 | #include <asm/btext.h> | |
47 | #include <asm/sections.h> | |
48 | #include <asm/machdep.h> | |
49 | #include <asm/pSeries_reconfig.h> | |
40ef8cbc | 50 | #include <asm/pci-bridge.h> |
9b6b563c PM |
51 | |
52 | #ifdef DEBUG | |
53 | #define DBG(fmt...) printk(KERN_ERR fmt) | |
54 | #else | |
55 | #define DBG(fmt...) | |
56 | #endif | |
57 | ||
58 | struct pci_reg_property { | |
59 | struct pci_address addr; | |
60 | u32 size_hi; | |
61 | u32 size_lo; | |
62 | }; | |
63 | ||
64 | struct isa_reg_property { | |
65 | u32 space; | |
66 | u32 address; | |
67 | u32 size; | |
68 | }; | |
69 | ||
70 | ||
71 | typedef int interpret_func(struct device_node *, unsigned long *, | |
72 | int, int, int); | |
73 | ||
74 | extern struct rtas_t rtas; | |
75 | extern struct lmb lmb; | |
76 | extern unsigned long klimit; | |
77 | ||
9b6b563c PM |
78 | static int __initdata dt_root_addr_cells; |
79 | static int __initdata dt_root_size_cells; | |
80 | ||
81 | #ifdef CONFIG_PPC64 | |
82 | static int __initdata iommu_is_off; | |
83 | int __initdata iommu_force_on; | |
cf00a8d1 | 84 | unsigned long tce_alloc_start, tce_alloc_end; |
9b6b563c PM |
85 | #endif |
86 | ||
87 | typedef u32 cell_t; | |
88 | ||
89 | #if 0 | |
90 | static struct boot_param_header *initial_boot_params __initdata; | |
91 | #else | |
92 | struct boot_param_header *initial_boot_params; | |
93 | #endif | |
94 | ||
95 | static struct device_node *allnodes = NULL; | |
96 | ||
97 | /* use when traversing tree through the allnext, child, sibling, | |
98 | * or parent members of struct device_node. | |
99 | */ | |
100 | static DEFINE_RWLOCK(devtree_lock); | |
101 | ||
102 | /* export that to outside world */ | |
103 | struct device_node *of_chosen; | |
104 | ||
105 | struct device_node *dflt_interrupt_controller; | |
106 | int num_interrupt_controllers; | |
107 | ||
9b6b563c PM |
108 | /* |
109 | * Wrapper for allocating memory for various data that needs to be | |
110 | * attached to device nodes as they are processed at boot or when | |
111 | * added to the device tree later (e.g. DLPAR). At boot there is | |
112 | * already a region reserved so we just increment *mem_start by size; | |
113 | * otherwise we call kmalloc. | |
114 | */ | |
115 | static void * prom_alloc(unsigned long size, unsigned long *mem_start) | |
116 | { | |
117 | unsigned long tmp; | |
118 | ||
119 | if (!mem_start) | |
120 | return kmalloc(size, GFP_KERNEL); | |
121 | ||
122 | tmp = *mem_start; | |
123 | *mem_start += size; | |
124 | return (void *)tmp; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Find the device_node with a given phandle. | |
129 | */ | |
130 | static struct device_node * find_phandle(phandle ph) | |
131 | { | |
132 | struct device_node *np; | |
133 | ||
134 | for (np = allnodes; np != 0; np = np->allnext) | |
135 | if (np->linux_phandle == ph) | |
136 | return np; | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Find the interrupt parent of a node. | |
142 | */ | |
143 | static struct device_node * __devinit intr_parent(struct device_node *p) | |
144 | { | |
145 | phandle *parp; | |
146 | ||
147 | parp = (phandle *) get_property(p, "interrupt-parent", NULL); | |
148 | if (parp == NULL) | |
149 | return p->parent; | |
150 | p = find_phandle(*parp); | |
151 | if (p != NULL) | |
152 | return p; | |
153 | /* | |
154 | * On a powermac booted with BootX, we don't get to know the | |
155 | * phandles for any nodes, so find_phandle will return NULL. | |
156 | * Fortunately these machines only have one interrupt controller | |
157 | * so there isn't in fact any ambiguity. -- paulus | |
158 | */ | |
159 | if (num_interrupt_controllers == 1) | |
160 | p = dflt_interrupt_controller; | |
161 | return p; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Find out the size of each entry of the interrupts property | |
166 | * for a node. | |
167 | */ | |
168 | int __devinit prom_n_intr_cells(struct device_node *np) | |
169 | { | |
170 | struct device_node *p; | |
171 | unsigned int *icp; | |
172 | ||
173 | for (p = np; (p = intr_parent(p)) != NULL; ) { | |
174 | icp = (unsigned int *) | |
175 | get_property(p, "#interrupt-cells", NULL); | |
176 | if (icp != NULL) | |
177 | return *icp; | |
178 | if (get_property(p, "interrupt-controller", NULL) != NULL | |
179 | || get_property(p, "interrupt-map", NULL) != NULL) { | |
180 | printk("oops, node %s doesn't have #interrupt-cells\n", | |
181 | p->full_name); | |
182 | return 1; | |
183 | } | |
184 | } | |
185 | #ifdef DEBUG_IRQ | |
186 | printk("prom_n_intr_cells failed for %s\n", np->full_name); | |
187 | #endif | |
188 | return 1; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Map an interrupt from a device up to the platform interrupt | |
193 | * descriptor. | |
194 | */ | |
195 | static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler, | |
196 | struct device_node *np, unsigned int *ints, | |
197 | int nintrc) | |
198 | { | |
199 | struct device_node *p, *ipar; | |
200 | unsigned int *imap, *imask, *ip; | |
201 | int i, imaplen, match; | |
202 | int newintrc = 0, newaddrc = 0; | |
203 | unsigned int *reg; | |
204 | int naddrc; | |
205 | ||
206 | reg = (unsigned int *) get_property(np, "reg", NULL); | |
207 | naddrc = prom_n_addr_cells(np); | |
208 | p = intr_parent(np); | |
209 | while (p != NULL) { | |
210 | if (get_property(p, "interrupt-controller", NULL) != NULL) | |
211 | /* this node is an interrupt controller, stop here */ | |
212 | break; | |
213 | imap = (unsigned int *) | |
214 | get_property(p, "interrupt-map", &imaplen); | |
215 | if (imap == NULL) { | |
216 | p = intr_parent(p); | |
217 | continue; | |
218 | } | |
219 | imask = (unsigned int *) | |
220 | get_property(p, "interrupt-map-mask", NULL); | |
221 | if (imask == NULL) { | |
222 | printk("oops, %s has interrupt-map but no mask\n", | |
223 | p->full_name); | |
224 | return 0; | |
225 | } | |
226 | imaplen /= sizeof(unsigned int); | |
227 | match = 0; | |
228 | ipar = NULL; | |
229 | while (imaplen > 0 && !match) { | |
230 | /* check the child-interrupt field */ | |
231 | match = 1; | |
232 | for (i = 0; i < naddrc && match; ++i) | |
233 | match = ((reg[i] ^ imap[i]) & imask[i]) == 0; | |
234 | for (; i < naddrc + nintrc && match; ++i) | |
235 | match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0; | |
236 | imap += naddrc + nintrc; | |
237 | imaplen -= naddrc + nintrc; | |
238 | /* grab the interrupt parent */ | |
239 | ipar = find_phandle((phandle) *imap++); | |
240 | --imaplen; | |
241 | if (ipar == NULL && num_interrupt_controllers == 1) | |
242 | /* cope with BootX not giving us phandles */ | |
243 | ipar = dflt_interrupt_controller; | |
244 | if (ipar == NULL) { | |
245 | printk("oops, no int parent %x in map of %s\n", | |
246 | imap[-1], p->full_name); | |
247 | return 0; | |
248 | } | |
249 | /* find the parent's # addr and intr cells */ | |
250 | ip = (unsigned int *) | |
251 | get_property(ipar, "#interrupt-cells", NULL); | |
252 | if (ip == NULL) { | |
253 | printk("oops, no #interrupt-cells on %s\n", | |
254 | ipar->full_name); | |
255 | return 0; | |
256 | } | |
257 | newintrc = *ip; | |
258 | ip = (unsigned int *) | |
259 | get_property(ipar, "#address-cells", NULL); | |
260 | newaddrc = (ip == NULL)? 0: *ip; | |
261 | imap += newaddrc + newintrc; | |
262 | imaplen -= newaddrc + newintrc; | |
263 | } | |
264 | if (imaplen < 0) { | |
265 | printk("oops, error decoding int-map on %s, len=%d\n", | |
266 | p->full_name, imaplen); | |
267 | return 0; | |
268 | } | |
269 | if (!match) { | |
270 | #ifdef DEBUG_IRQ | |
271 | printk("oops, no match in %s int-map for %s\n", | |
272 | p->full_name, np->full_name); | |
273 | #endif | |
274 | return 0; | |
275 | } | |
276 | p = ipar; | |
277 | naddrc = newaddrc; | |
278 | nintrc = newintrc; | |
279 | ints = imap - nintrc; | |
280 | reg = ints - naddrc; | |
281 | } | |
282 | if (p == NULL) { | |
283 | #ifdef DEBUG_IRQ | |
284 | printk("hmmm, int tree for %s doesn't have ctrler\n", | |
285 | np->full_name); | |
286 | #endif | |
287 | return 0; | |
288 | } | |
289 | *irq = ints; | |
290 | *ictrler = p; | |
291 | return nintrc; | |
292 | } | |
293 | ||
6d0124fc PM |
294 | static unsigned char map_isa_senses[4] = { |
295 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
296 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
297 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
298 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE | |
299 | }; | |
300 | ||
301 | static unsigned char map_mpic_senses[4] = { | |
302 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE, | |
303 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, | |
304 | /* 2 seems to be used for the 8259 cascade... */ | |
305 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, | |
306 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, | |
307 | }; | |
308 | ||
9b6b563c PM |
309 | static int __devinit finish_node_interrupts(struct device_node *np, |
310 | unsigned long *mem_start, | |
311 | int measure_only) | |
312 | { | |
313 | unsigned int *ints; | |
314 | int intlen, intrcells, intrcount; | |
6d0124fc | 315 | int i, j, n, sense; |
9b6b563c PM |
316 | unsigned int *irq, virq; |
317 | struct device_node *ic; | |
318 | ||
a575b807 PM |
319 | if (num_interrupt_controllers == 0) { |
320 | /* | |
321 | * Old machines just have a list of interrupt numbers | |
322 | * and no interrupt-controller nodes. | |
323 | */ | |
324 | ints = (unsigned int *) get_property(np, "AAPL,interrupts", | |
325 | &intlen); | |
326 | /* XXX old interpret_pci_props looked in parent too */ | |
327 | /* XXX old interpret_macio_props looked for interrupts | |
328 | before AAPL,interrupts */ | |
329 | if (ints == NULL) | |
330 | ints = (unsigned int *) get_property(np, "interrupts", | |
331 | &intlen); | |
332 | if (ints == NULL) | |
333 | return 0; | |
334 | ||
335 | np->n_intrs = intlen / sizeof(unsigned int); | |
336 | np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]), | |
337 | mem_start); | |
338 | if (!np->intrs) | |
339 | return -ENOMEM; | |
340 | if (measure_only) | |
341 | return 0; | |
342 | ||
343 | for (i = 0; i < np->n_intrs; ++i) { | |
344 | np->intrs[i].line = *ints++; | |
6d0124fc PM |
345 | np->intrs[i].sense = IRQ_SENSE_LEVEL |
346 | | IRQ_POLARITY_NEGATIVE; | |
a575b807 PM |
347 | } |
348 | return 0; | |
349 | } | |
350 | ||
9b6b563c PM |
351 | ints = (unsigned int *) get_property(np, "interrupts", &intlen); |
352 | if (ints == NULL) | |
353 | return 0; | |
354 | intrcells = prom_n_intr_cells(np); | |
355 | intlen /= intrcells * sizeof(unsigned int); | |
356 | ||
357 | np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start); | |
358 | if (!np->intrs) | |
359 | return -ENOMEM; | |
360 | ||
361 | if (measure_only) | |
362 | return 0; | |
363 | ||
364 | intrcount = 0; | |
365 | for (i = 0; i < intlen; ++i, ints += intrcells) { | |
366 | n = map_interrupt(&irq, &ic, np, ints, intrcells); | |
367 | if (n <= 0) | |
368 | continue; | |
369 | ||
370 | /* don't map IRQ numbers under a cascaded 8259 controller */ | |
371 | if (ic && device_is_compatible(ic, "chrp,iic")) { | |
372 | np->intrs[intrcount].line = irq[0]; | |
6d0124fc PM |
373 | sense = (n > 1)? (irq[1] & 3): 3; |
374 | np->intrs[intrcount].sense = map_isa_senses[sense]; | |
9b6b563c | 375 | } else { |
9b6b563c | 376 | virq = virt_irq_create_mapping(irq[0]); |
6d0124fc | 377 | #ifdef CONFIG_PPC64 |
9b6b563c PM |
378 | if (virq == NO_IRQ) { |
379 | printk(KERN_CRIT "Could not allocate interrupt" | |
380 | " number for %s\n", np->full_name); | |
381 | continue; | |
382 | } | |
9b6b563c | 383 | #endif |
6d0124fc PM |
384 | np->intrs[intrcount].line = irq_offset_up(virq); |
385 | sense = (n > 1)? (irq[1] & 3): 1; | |
386 | np->intrs[intrcount].sense = map_mpic_senses[sense]; | |
9b6b563c PM |
387 | } |
388 | ||
389 | #ifdef CONFIG_PPC64 | |
390 | /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */ | |
799d6046 | 391 | if (_machine == PLATFORM_POWERMAC && ic && ic->parent) { |
9b6b563c PM |
392 | char *name = get_property(ic->parent, "name", NULL); |
393 | if (name && !strcmp(name, "u3")) | |
394 | np->intrs[intrcount].line += 128; | |
395 | else if (!(name && !strcmp(name, "mac-io"))) | |
396 | /* ignore other cascaded controllers, such as | |
397 | the k2-sata-root */ | |
398 | break; | |
399 | } | |
400 | #endif | |
9b6b563c PM |
401 | if (n > 2) { |
402 | printk("hmmm, got %d intr cells for %s:", n, | |
403 | np->full_name); | |
404 | for (j = 0; j < n; ++j) | |
405 | printk(" %d", irq[j]); | |
406 | printk("\n"); | |
407 | } | |
408 | ++intrcount; | |
409 | } | |
410 | np->n_intrs = intrcount; | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static int __devinit interpret_pci_props(struct device_node *np, | |
416 | unsigned long *mem_start, | |
417 | int naddrc, int nsizec, | |
418 | int measure_only) | |
419 | { | |
420 | struct address_range *adr; | |
421 | struct pci_reg_property *pci_addrs; | |
422 | int i, l, n_addrs; | |
423 | ||
424 | pci_addrs = (struct pci_reg_property *) | |
425 | get_property(np, "assigned-addresses", &l); | |
426 | if (!pci_addrs) | |
427 | return 0; | |
428 | ||
429 | n_addrs = l / sizeof(*pci_addrs); | |
430 | ||
431 | adr = prom_alloc(n_addrs * sizeof(*adr), mem_start); | |
432 | if (!adr) | |
433 | return -ENOMEM; | |
434 | ||
435 | if (measure_only) | |
436 | return 0; | |
437 | ||
438 | np->addrs = adr; | |
439 | np->n_addrs = n_addrs; | |
440 | ||
441 | for (i = 0; i < n_addrs; i++) { | |
442 | adr[i].space = pci_addrs[i].addr.a_hi; | |
443 | adr[i].address = pci_addrs[i].addr.a_lo | | |
444 | ((u64)pci_addrs[i].addr.a_mid << 32); | |
445 | adr[i].size = pci_addrs[i].size_lo; | |
446 | } | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | static int __init interpret_dbdma_props(struct device_node *np, | |
452 | unsigned long *mem_start, | |
453 | int naddrc, int nsizec, | |
454 | int measure_only) | |
455 | { | |
456 | struct reg_property32 *rp; | |
457 | struct address_range *adr; | |
458 | unsigned long base_address; | |
459 | int i, l; | |
460 | struct device_node *db; | |
461 | ||
462 | base_address = 0; | |
463 | if (!measure_only) { | |
464 | for (db = np->parent; db != NULL; db = db->parent) { | |
465 | if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) { | |
466 | base_address = db->addrs[0].address; | |
467 | break; | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
472 | rp = (struct reg_property32 *) get_property(np, "reg", &l); | |
473 | if (rp != 0 && l >= sizeof(struct reg_property32)) { | |
474 | i = 0; | |
475 | adr = (struct address_range *) (*mem_start); | |
476 | while ((l -= sizeof(struct reg_property32)) >= 0) { | |
477 | if (!measure_only) { | |
478 | adr[i].space = 2; | |
479 | adr[i].address = rp[i].address + base_address; | |
480 | adr[i].size = rp[i].size; | |
481 | } | |
482 | ++i; | |
483 | } | |
484 | np->addrs = adr; | |
485 | np->n_addrs = i; | |
486 | (*mem_start) += i * sizeof(struct address_range); | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static int __init interpret_macio_props(struct device_node *np, | |
493 | unsigned long *mem_start, | |
494 | int naddrc, int nsizec, | |
495 | int measure_only) | |
496 | { | |
497 | struct reg_property32 *rp; | |
498 | struct address_range *adr; | |
499 | unsigned long base_address; | |
500 | int i, l; | |
501 | struct device_node *db; | |
502 | ||
503 | base_address = 0; | |
504 | if (!measure_only) { | |
505 | for (db = np->parent; db != NULL; db = db->parent) { | |
506 | if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) { | |
507 | base_address = db->addrs[0].address; | |
508 | break; | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
513 | rp = (struct reg_property32 *) get_property(np, "reg", &l); | |
514 | if (rp != 0 && l >= sizeof(struct reg_property32)) { | |
515 | i = 0; | |
516 | adr = (struct address_range *) (*mem_start); | |
517 | while ((l -= sizeof(struct reg_property32)) >= 0) { | |
518 | if (!measure_only) { | |
519 | adr[i].space = 2; | |
520 | adr[i].address = rp[i].address + base_address; | |
521 | adr[i].size = rp[i].size; | |
522 | } | |
523 | ++i; | |
524 | } | |
525 | np->addrs = adr; | |
526 | np->n_addrs = i; | |
527 | (*mem_start) += i * sizeof(struct address_range); | |
528 | } | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static int __init interpret_isa_props(struct device_node *np, | |
534 | unsigned long *mem_start, | |
535 | int naddrc, int nsizec, | |
536 | int measure_only) | |
537 | { | |
538 | struct isa_reg_property *rp; | |
539 | struct address_range *adr; | |
540 | int i, l; | |
541 | ||
542 | rp = (struct isa_reg_property *) get_property(np, "reg", &l); | |
543 | if (rp != 0 && l >= sizeof(struct isa_reg_property)) { | |
544 | i = 0; | |
545 | adr = (struct address_range *) (*mem_start); | |
546 | while ((l -= sizeof(struct isa_reg_property)) >= 0) { | |
547 | if (!measure_only) { | |
548 | adr[i].space = rp[i].space; | |
549 | adr[i].address = rp[i].address; | |
550 | adr[i].size = rp[i].size; | |
551 | } | |
552 | ++i; | |
553 | } | |
554 | np->addrs = adr; | |
555 | np->n_addrs = i; | |
556 | (*mem_start) += i * sizeof(struct address_range); | |
557 | } | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | static int __init interpret_root_props(struct device_node *np, | |
563 | unsigned long *mem_start, | |
564 | int naddrc, int nsizec, | |
565 | int measure_only) | |
566 | { | |
567 | struct address_range *adr; | |
568 | int i, l; | |
569 | unsigned int *rp; | |
570 | int rpsize = (naddrc + nsizec) * sizeof(unsigned int); | |
571 | ||
572 | rp = (unsigned int *) get_property(np, "reg", &l); | |
573 | if (rp != 0 && l >= rpsize) { | |
574 | i = 0; | |
575 | adr = (struct address_range *) (*mem_start); | |
576 | while ((l -= rpsize) >= 0) { | |
577 | if (!measure_only) { | |
578 | adr[i].space = 0; | |
579 | adr[i].address = rp[naddrc - 1]; | |
580 | adr[i].size = rp[naddrc + nsizec - 1]; | |
581 | } | |
582 | ++i; | |
583 | rp += naddrc + nsizec; | |
584 | } | |
585 | np->addrs = adr; | |
586 | np->n_addrs = i; | |
587 | (*mem_start) += i * sizeof(struct address_range); | |
588 | } | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | static int __devinit finish_node(struct device_node *np, | |
594 | unsigned long *mem_start, | |
595 | interpret_func *ifunc, | |
596 | int naddrc, int nsizec, | |
597 | int measure_only) | |
598 | { | |
599 | struct device_node *child; | |
600 | int *ip, rc = 0; | |
601 | ||
602 | /* get the device addresses and interrupts */ | |
603 | if (ifunc != NULL) | |
604 | rc = ifunc(np, mem_start, naddrc, nsizec, measure_only); | |
605 | if (rc) | |
606 | goto out; | |
607 | ||
608 | rc = finish_node_interrupts(np, mem_start, measure_only); | |
609 | if (rc) | |
610 | goto out; | |
611 | ||
612 | /* Look for #address-cells and #size-cells properties. */ | |
613 | ip = (int *) get_property(np, "#address-cells", NULL); | |
614 | if (ip != NULL) | |
615 | naddrc = *ip; | |
616 | ip = (int *) get_property(np, "#size-cells", NULL); | |
617 | if (ip != NULL) | |
618 | nsizec = *ip; | |
619 | ||
620 | if (!strcmp(np->name, "device-tree") || np->parent == NULL) | |
621 | ifunc = interpret_root_props; | |
622 | else if (np->type == 0) | |
623 | ifunc = NULL; | |
624 | else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci")) | |
625 | ifunc = interpret_pci_props; | |
626 | else if (!strcmp(np->type, "dbdma")) | |
627 | ifunc = interpret_dbdma_props; | |
628 | else if (!strcmp(np->type, "mac-io") || ifunc == interpret_macio_props) | |
629 | ifunc = interpret_macio_props; | |
630 | else if (!strcmp(np->type, "isa")) | |
631 | ifunc = interpret_isa_props; | |
632 | else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3")) | |
633 | ifunc = interpret_root_props; | |
634 | else if (!((ifunc == interpret_dbdma_props | |
635 | || ifunc == interpret_macio_props) | |
636 | && (!strcmp(np->type, "escc") | |
637 | || !strcmp(np->type, "media-bay")))) | |
638 | ifunc = NULL; | |
639 | ||
640 | for (child = np->child; child != NULL; child = child->sibling) { | |
641 | rc = finish_node(child, mem_start, ifunc, | |
642 | naddrc, nsizec, measure_only); | |
643 | if (rc) | |
644 | goto out; | |
645 | } | |
646 | out: | |
647 | return rc; | |
648 | } | |
649 | ||
650 | static void __init scan_interrupt_controllers(void) | |
651 | { | |
652 | struct device_node *np; | |
653 | int n = 0; | |
654 | char *name, *ic; | |
655 | int iclen; | |
656 | ||
657 | for (np = allnodes; np != NULL; np = np->allnext) { | |
658 | ic = get_property(np, "interrupt-controller", &iclen); | |
659 | name = get_property(np, "name", NULL); | |
660 | /* checking iclen makes sure we don't get a false | |
661 | match on /chosen.interrupt_controller */ | |
662 | if ((name != NULL | |
663 | && strcmp(name, "interrupt-controller") == 0) | |
664 | || (ic != NULL && iclen == 0 | |
665 | && strcmp(name, "AppleKiwi"))) { | |
666 | if (n == 0) | |
667 | dflt_interrupt_controller = np; | |
668 | ++n; | |
669 | } | |
670 | } | |
671 | num_interrupt_controllers = n; | |
672 | } | |
673 | ||
674 | /** | |
675 | * finish_device_tree is called once things are running normally | |
676 | * (i.e. with text and data mapped to the address they were linked at). | |
677 | * It traverses the device tree and fills in some of the additional, | |
678 | * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt | |
679 | * mapping is also initialized at this point. | |
680 | */ | |
681 | void __init finish_device_tree(void) | |
682 | { | |
683 | unsigned long start, end, size = 0; | |
684 | ||
685 | DBG(" -> finish_device_tree\n"); | |
686 | ||
687 | #ifdef CONFIG_PPC64 | |
688 | /* Initialize virtual IRQ map */ | |
689 | virt_irq_init(); | |
690 | #endif | |
691 | scan_interrupt_controllers(); | |
692 | ||
693 | /* | |
694 | * Finish device-tree (pre-parsing some properties etc...) | |
695 | * We do this in 2 passes. One with "measure_only" set, which | |
696 | * will only measure the amount of memory needed, then we can | |
697 | * allocate that memory, and call finish_node again. However, | |
698 | * we must be careful as most routines will fail nowadays when | |
699 | * prom_alloc() returns 0, so we must make sure our first pass | |
700 | * doesn't start at 0. We pre-initialize size to 16 for that | |
701 | * reason and then remove those additional 16 bytes | |
702 | */ | |
703 | size = 16; | |
704 | finish_node(allnodes, &size, NULL, 0, 0, 1); | |
705 | size -= 16; | |
706 | end = start = (unsigned long) __va(lmb_alloc(size, 128)); | |
707 | finish_node(allnodes, &end, NULL, 0, 0, 0); | |
708 | BUG_ON(end != start + size); | |
709 | ||
710 | DBG(" <- finish_device_tree\n"); | |
711 | } | |
712 | ||
713 | static inline char *find_flat_dt_string(u32 offset) | |
714 | { | |
715 | return ((char *)initial_boot_params) + | |
716 | initial_boot_params->off_dt_strings + offset; | |
717 | } | |
718 | ||
719 | /** | |
720 | * This function is used to scan the flattened device-tree, it is | |
721 | * used to extract the memory informations at boot before we can | |
722 | * unflatten the tree | |
723 | */ | |
3c726f8d BH |
724 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
725 | const char *uname, int depth, | |
726 | void *data), | |
727 | void *data) | |
9b6b563c PM |
728 | { |
729 | unsigned long p = ((unsigned long)initial_boot_params) + | |
730 | initial_boot_params->off_dt_struct; | |
731 | int rc = 0; | |
732 | int depth = -1; | |
733 | ||
734 | do { | |
735 | u32 tag = *((u32 *)p); | |
736 | char *pathp; | |
737 | ||
738 | p += 4; | |
739 | if (tag == OF_DT_END_NODE) { | |
740 | depth --; | |
741 | continue; | |
742 | } | |
743 | if (tag == OF_DT_NOP) | |
744 | continue; | |
745 | if (tag == OF_DT_END) | |
746 | break; | |
747 | if (tag == OF_DT_PROP) { | |
748 | u32 sz = *((u32 *)p); | |
749 | p += 8; | |
750 | if (initial_boot_params->version < 0x10) | |
751 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
752 | p += sz; | |
753 | p = _ALIGN(p, 4); | |
754 | continue; | |
755 | } | |
756 | if (tag != OF_DT_BEGIN_NODE) { | |
757 | printk(KERN_WARNING "Invalid tag %x scanning flattened" | |
758 | " device tree !\n", tag); | |
759 | return -EINVAL; | |
760 | } | |
761 | depth++; | |
762 | pathp = (char *)p; | |
763 | p = _ALIGN(p + strlen(pathp) + 1, 4); | |
764 | if ((*pathp) == '/') { | |
765 | char *lp, *np; | |
766 | for (lp = NULL, np = pathp; *np; np++) | |
767 | if ((*np) == '/') | |
768 | lp = np+1; | |
769 | if (lp != NULL) | |
770 | pathp = lp; | |
771 | } | |
772 | rc = it(p, pathp, depth, data); | |
773 | if (rc != 0) | |
774 | break; | |
775 | } while(1); | |
776 | ||
777 | return rc; | |
778 | } | |
779 | ||
780 | /** | |
781 | * This function can be used within scan_flattened_dt callback to get | |
782 | * access to properties | |
783 | */ | |
3c726f8d BH |
784 | void* __init of_get_flat_dt_prop(unsigned long node, const char *name, |
785 | unsigned long *size) | |
9b6b563c PM |
786 | { |
787 | unsigned long p = node; | |
788 | ||
789 | do { | |
790 | u32 tag = *((u32 *)p); | |
791 | u32 sz, noff; | |
792 | const char *nstr; | |
793 | ||
794 | p += 4; | |
795 | if (tag == OF_DT_NOP) | |
796 | continue; | |
797 | if (tag != OF_DT_PROP) | |
798 | return NULL; | |
799 | ||
800 | sz = *((u32 *)p); | |
801 | noff = *((u32 *)(p + 4)); | |
802 | p += 8; | |
803 | if (initial_boot_params->version < 0x10) | |
804 | p = _ALIGN(p, sz >= 8 ? 8 : 4); | |
805 | ||
806 | nstr = find_flat_dt_string(noff); | |
807 | if (nstr == NULL) { | |
808 | printk(KERN_WARNING "Can't find property index" | |
809 | " name !\n"); | |
810 | return NULL; | |
811 | } | |
812 | if (strcmp(name, nstr) == 0) { | |
813 | if (size) | |
814 | *size = sz; | |
815 | return (void *)p; | |
816 | } | |
817 | p += sz; | |
818 | p = _ALIGN(p, 4); | |
819 | } while(1); | |
820 | } | |
821 | ||
822 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, | |
823 | unsigned long align) | |
824 | { | |
825 | void *res; | |
826 | ||
827 | *mem = _ALIGN(*mem, align); | |
828 | res = (void *)*mem; | |
829 | *mem += size; | |
830 | ||
831 | return res; | |
832 | } | |
833 | ||
834 | static unsigned long __init unflatten_dt_node(unsigned long mem, | |
835 | unsigned long *p, | |
836 | struct device_node *dad, | |
837 | struct device_node ***allnextpp, | |
838 | unsigned long fpsize) | |
839 | { | |
840 | struct device_node *np; | |
841 | struct property *pp, **prev_pp = NULL; | |
842 | char *pathp; | |
843 | u32 tag; | |
844 | unsigned int l, allocl; | |
845 | int has_name = 0; | |
846 | int new_format = 0; | |
847 | ||
848 | tag = *((u32 *)(*p)); | |
849 | if (tag != OF_DT_BEGIN_NODE) { | |
850 | printk("Weird tag at start of node: %x\n", tag); | |
851 | return mem; | |
852 | } | |
853 | *p += 4; | |
854 | pathp = (char *)*p; | |
855 | l = allocl = strlen(pathp) + 1; | |
856 | *p = _ALIGN(*p + l, 4); | |
857 | ||
858 | /* version 0x10 has a more compact unit name here instead of the full | |
859 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
860 | * it later. We detect this because the first character of the name is | |
861 | * not '/'. | |
862 | */ | |
863 | if ((*pathp) != '/') { | |
864 | new_format = 1; | |
865 | if (fpsize == 0) { | |
866 | /* root node: special case. fpsize accounts for path | |
867 | * plus terminating zero. root node only has '/', so | |
868 | * fpsize should be 2, but we want to avoid the first | |
869 | * level nodes to have two '/' so we use fpsize 1 here | |
870 | */ | |
871 | fpsize = 1; | |
872 | allocl = 2; | |
873 | } else { | |
874 | /* account for '/' and path size minus terminal 0 | |
875 | * already in 'l' | |
876 | */ | |
877 | fpsize += l; | |
878 | allocl = fpsize; | |
879 | } | |
880 | } | |
881 | ||
882 | ||
883 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
884 | __alignof__(struct device_node)); | |
885 | if (allnextpp) { | |
886 | memset(np, 0, sizeof(*np)); | |
887 | np->full_name = ((char*)np) + sizeof(struct device_node); | |
888 | if (new_format) { | |
889 | char *p = np->full_name; | |
890 | /* rebuild full path for new format */ | |
891 | if (dad && dad->parent) { | |
892 | strcpy(p, dad->full_name); | |
893 | #ifdef DEBUG | |
894 | if ((strlen(p) + l + 1) != allocl) { | |
895 | DBG("%s: p: %d, l: %d, a: %d\n", | |
896 | pathp, strlen(p), l, allocl); | |
897 | } | |
898 | #endif | |
899 | p += strlen(p); | |
900 | } | |
901 | *(p++) = '/'; | |
902 | memcpy(p, pathp, l); | |
903 | } else | |
904 | memcpy(np->full_name, pathp, l); | |
905 | prev_pp = &np->properties; | |
906 | **allnextpp = np; | |
907 | *allnextpp = &np->allnext; | |
908 | if (dad != NULL) { | |
909 | np->parent = dad; | |
910 | /* we temporarily use the next field as `last_child'*/ | |
911 | if (dad->next == 0) | |
912 | dad->child = np; | |
913 | else | |
914 | dad->next->sibling = np; | |
915 | dad->next = np; | |
916 | } | |
917 | kref_init(&np->kref); | |
918 | } | |
919 | while(1) { | |
920 | u32 sz, noff; | |
921 | char *pname; | |
922 | ||
923 | tag = *((u32 *)(*p)); | |
924 | if (tag == OF_DT_NOP) { | |
925 | *p += 4; | |
926 | continue; | |
927 | } | |
928 | if (tag != OF_DT_PROP) | |
929 | break; | |
930 | *p += 4; | |
931 | sz = *((u32 *)(*p)); | |
932 | noff = *((u32 *)((*p) + 4)); | |
933 | *p += 8; | |
934 | if (initial_boot_params->version < 0x10) | |
935 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); | |
936 | ||
937 | pname = find_flat_dt_string(noff); | |
938 | if (pname == NULL) { | |
939 | printk("Can't find property name in list !\n"); | |
940 | break; | |
941 | } | |
942 | if (strcmp(pname, "name") == 0) | |
943 | has_name = 1; | |
944 | l = strlen(pname) + 1; | |
945 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
946 | __alignof__(struct property)); | |
947 | if (allnextpp) { | |
948 | if (strcmp(pname, "linux,phandle") == 0) { | |
949 | np->node = *((u32 *)*p); | |
950 | if (np->linux_phandle == 0) | |
951 | np->linux_phandle = np->node; | |
952 | } | |
953 | if (strcmp(pname, "ibm,phandle") == 0) | |
954 | np->linux_phandle = *((u32 *)*p); | |
955 | pp->name = pname; | |
956 | pp->length = sz; | |
957 | pp->value = (void *)*p; | |
958 | *prev_pp = pp; | |
959 | prev_pp = &pp->next; | |
960 | } | |
961 | *p = _ALIGN((*p) + sz, 4); | |
962 | } | |
963 | /* with version 0x10 we may not have the name property, recreate | |
964 | * it here from the unit name if absent | |
965 | */ | |
966 | if (!has_name) { | |
967 | char *p = pathp, *ps = pathp, *pa = NULL; | |
968 | int sz; | |
969 | ||
970 | while (*p) { | |
971 | if ((*p) == '@') | |
972 | pa = p; | |
973 | if ((*p) == '/') | |
974 | ps = p + 1; | |
975 | p++; | |
976 | } | |
977 | if (pa < ps) | |
978 | pa = p; | |
979 | sz = (pa - ps) + 1; | |
980 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
981 | __alignof__(struct property)); | |
982 | if (allnextpp) { | |
983 | pp->name = "name"; | |
984 | pp->length = sz; | |
985 | pp->value = (unsigned char *)(pp + 1); | |
986 | *prev_pp = pp; | |
987 | prev_pp = &pp->next; | |
988 | memcpy(pp->value, ps, sz - 1); | |
989 | ((char *)pp->value)[sz - 1] = 0; | |
990 | DBG("fixed up name for %s -> %s\n", pathp, pp->value); | |
991 | } | |
992 | } | |
993 | if (allnextpp) { | |
994 | *prev_pp = NULL; | |
995 | np->name = get_property(np, "name", NULL); | |
996 | np->type = get_property(np, "device_type", NULL); | |
997 | ||
998 | if (!np->name) | |
999 | np->name = "<NULL>"; | |
1000 | if (!np->type) | |
1001 | np->type = "<NULL>"; | |
1002 | } | |
1003 | while (tag == OF_DT_BEGIN_NODE) { | |
1004 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
1005 | tag = *((u32 *)(*p)); | |
1006 | } | |
1007 | if (tag != OF_DT_END_NODE) { | |
1008 | printk("Weird tag at end of node: %x\n", tag); | |
1009 | return mem; | |
1010 | } | |
1011 | *p += 4; | |
1012 | return mem; | |
1013 | } | |
1014 | ||
1015 | ||
1016 | /** | |
1017 | * unflattens the device-tree passed by the firmware, creating the | |
1018 | * tree of struct device_node. It also fills the "name" and "type" | |
1019 | * pointers of the nodes so the normal device-tree walking functions | |
1020 | * can be used (this used to be done by finish_device_tree) | |
1021 | */ | |
1022 | void __init unflatten_device_tree(void) | |
1023 | { | |
1024 | unsigned long start, mem, size; | |
1025 | struct device_node **allnextp = &allnodes; | |
1026 | char *p = NULL; | |
1027 | int l = 0; | |
1028 | ||
1029 | DBG(" -> unflatten_device_tree()\n"); | |
1030 | ||
1031 | /* First pass, scan for size */ | |
1032 | start = ((unsigned long)initial_boot_params) + | |
1033 | initial_boot_params->off_dt_struct; | |
1034 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); | |
1035 | size = (size | 3) + 1; | |
1036 | ||
1037 | DBG(" size is %lx, allocating...\n", size); | |
1038 | ||
1039 | /* Allocate memory for the expanded device tree */ | |
1040 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); | |
1041 | if (!mem) { | |
1042 | DBG("Couldn't allocate memory with lmb_alloc()!\n"); | |
1043 | panic("Couldn't allocate memory with lmb_alloc()!\n"); | |
1044 | } | |
1045 | mem = (unsigned long) __va(mem); | |
1046 | ||
1047 | ((u32 *)mem)[size / 4] = 0xdeadbeef; | |
1048 | ||
1049 | DBG(" unflattening %lx...\n", mem); | |
1050 | ||
1051 | /* Second pass, do actual unflattening */ | |
1052 | start = ((unsigned long)initial_boot_params) + | |
1053 | initial_boot_params->off_dt_struct; | |
1054 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); | |
1055 | if (*((u32 *)start) != OF_DT_END) | |
1056 | printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); | |
1057 | if (((u32 *)mem)[size / 4] != 0xdeadbeef) | |
1058 | printk(KERN_WARNING "End of tree marker overwritten: %08x\n", | |
1059 | ((u32 *)mem)[size / 4] ); | |
1060 | *allnextp = NULL; | |
1061 | ||
1062 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
1063 | of_chosen = of_find_node_by_path("/chosen"); | |
a575b807 PM |
1064 | if (of_chosen == NULL) |
1065 | of_chosen = of_find_node_by_path("/chosen@0"); | |
9b6b563c PM |
1066 | |
1067 | /* Retreive command line */ | |
1068 | if (of_chosen != NULL) { | |
1069 | p = (char *)get_property(of_chosen, "bootargs", &l); | |
1070 | if (p != NULL && l > 0) | |
1071 | strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE)); | |
1072 | } | |
1073 | #ifdef CONFIG_CMDLINE | |
1074 | if (l == 0 || (l == 1 && (*p) == 0)) | |
1075 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1076 | #endif /* CONFIG_CMDLINE */ | |
1077 | ||
1078 | DBG("Command line is: %s\n", cmd_line); | |
1079 | ||
1080 | DBG(" <- unflatten_device_tree()\n"); | |
1081 | } | |
1082 | ||
1083 | ||
1084 | static int __init early_init_dt_scan_cpus(unsigned long node, | |
1085 | const char *uname, int depth, void *data) | |
1086 | { | |
3c726f8d | 1087 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
9b6b563c PM |
1088 | u32 *prop; |
1089 | unsigned long size = 0; | |
1090 | ||
1091 | /* We are scanning "cpu" nodes only */ | |
1092 | if (type == NULL || strcmp(type, "cpu") != 0) | |
1093 | return 0; | |
1094 | ||
80579e1f PM |
1095 | boot_cpuid = 0; |
1096 | boot_cpuid_phys = 0; | |
9b6b563c PM |
1097 | if (initial_boot_params && initial_boot_params->version >= 2) { |
1098 | /* version 2 of the kexec param format adds the phys cpuid | |
1099 | * of booted proc. | |
1100 | */ | |
1101 | boot_cpuid_phys = initial_boot_params->boot_cpuid_phys; | |
9b6b563c | 1102 | } else { |
80579e1f | 1103 | /* Check if it's the boot-cpu, set it's hw index now */ |
3c726f8d BH |
1104 | if (of_get_flat_dt_prop(node, |
1105 | "linux,boot-cpu", NULL) != NULL) { | |
1106 | prop = of_get_flat_dt_prop(node, "reg", NULL); | |
80579e1f PM |
1107 | if (prop != NULL) |
1108 | boot_cpuid_phys = *prop; | |
9b6b563c PM |
1109 | } |
1110 | } | |
80579e1f | 1111 | set_hard_smp_processor_id(0, boot_cpuid_phys); |
9b6b563c PM |
1112 | |
1113 | #ifdef CONFIG_ALTIVEC | |
1114 | /* Check if we have a VMX and eventually update CPU features */ | |
3c726f8d | 1115 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,vmx", &size); |
9b6b563c PM |
1116 | if (prop && (*prop) > 0) { |
1117 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
1118 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
1119 | } | |
1120 | ||
1121 | /* Same goes for Apple's "altivec" property */ | |
3c726f8d | 1122 | prop = (u32 *)of_get_flat_dt_prop(node, "altivec", NULL); |
9b6b563c PM |
1123 | if (prop) { |
1124 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; | |
1125 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; | |
1126 | } | |
1127 | #endif /* CONFIG_ALTIVEC */ | |
1128 | ||
1129 | #ifdef CONFIG_PPC_PSERIES | |
1130 | /* | |
1131 | * Check for an SMT capable CPU and set the CPU feature. We do | |
1132 | * this by looking at the size of the ibm,ppc-interrupt-server#s | |
1133 | * property | |
1134 | */ | |
3c726f8d | 1135 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", |
9b6b563c PM |
1136 | &size); |
1137 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; | |
1138 | if (prop && ((size / sizeof(u32)) > 1)) | |
1139 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; | |
1140 | #endif | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static int __init early_init_dt_scan_chosen(unsigned long node, | |
1146 | const char *uname, int depth, void *data) | |
1147 | { | |
1148 | u32 *prop; | |
1149 | unsigned long *lprop; | |
1150 | ||
1151 | DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1152 | ||
a575b807 PM |
1153 | if (depth != 1 || |
1154 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
9b6b563c PM |
1155 | return 0; |
1156 | ||
1157 | /* get platform type */ | |
3c726f8d | 1158 | prop = (u32 *)of_get_flat_dt_prop(node, "linux,platform", NULL); |
9b6b563c PM |
1159 | if (prop == NULL) |
1160 | return 0; | |
60dda256 | 1161 | #ifdef CONFIG_PPC_MULTIPLATFORM |
9b6b563c PM |
1162 | _machine = *prop; |
1163 | #endif | |
1164 | ||
1165 | #ifdef CONFIG_PPC64 | |
1166 | /* check if iommu is forced on or off */ | |
3c726f8d | 1167 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
9b6b563c | 1168 | iommu_is_off = 1; |
3c726f8d | 1169 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
9b6b563c PM |
1170 | iommu_force_on = 1; |
1171 | #endif | |
1172 | ||
3c726f8d | 1173 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
9b6b563c PM |
1174 | if (lprop) |
1175 | memory_limit = *lprop; | |
1176 | ||
1177 | #ifdef CONFIG_PPC64 | |
3c726f8d | 1178 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
9b6b563c PM |
1179 | if (lprop) |
1180 | tce_alloc_start = *lprop; | |
3c726f8d | 1181 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
9b6b563c PM |
1182 | if (lprop) |
1183 | tce_alloc_end = *lprop; | |
1184 | #endif | |
1185 | ||
1186 | #ifdef CONFIG_PPC_RTAS | |
1187 | /* To help early debugging via the front panel, we retreive a minimal | |
1188 | * set of RTAS infos now if available | |
1189 | */ | |
1190 | { | |
1191 | u64 *basep, *entryp; | |
1192 | ||
3c726f8d BH |
1193 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
1194 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
1195 | prop = of_get_flat_dt_prop(node, "linux,rtas-size", NULL); | |
9b6b563c PM |
1196 | if (basep && entryp && prop) { |
1197 | rtas.base = *basep; | |
1198 | rtas.entry = *entryp; | |
1199 | rtas.size = *prop; | |
1200 | } | |
1201 | } | |
1202 | #endif /* CONFIG_PPC_RTAS */ | |
1203 | ||
1204 | /* break now */ | |
1205 | return 1; | |
1206 | } | |
1207 | ||
1208 | static int __init early_init_dt_scan_root(unsigned long node, | |
1209 | const char *uname, int depth, void *data) | |
1210 | { | |
1211 | u32 *prop; | |
1212 | ||
1213 | if (depth != 0) | |
1214 | return 0; | |
1215 | ||
3c726f8d | 1216 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
9b6b563c PM |
1217 | dt_root_size_cells = (prop == NULL) ? 1 : *prop; |
1218 | DBG("dt_root_size_cells = %x\n", dt_root_size_cells); | |
1219 | ||
3c726f8d | 1220 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
9b6b563c PM |
1221 | dt_root_addr_cells = (prop == NULL) ? 2 : *prop; |
1222 | DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); | |
1223 | ||
1224 | /* break now */ | |
1225 | return 1; | |
1226 | } | |
1227 | ||
1228 | static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) | |
1229 | { | |
1230 | cell_t *p = *cellp; | |
1231 | unsigned long r; | |
1232 | ||
1233 | /* Ignore more than 2 cells */ | |
1234 | while (s > sizeof(unsigned long) / 4) { | |
1235 | p++; | |
1236 | s--; | |
1237 | } | |
1238 | r = *p++; | |
1239 | #ifdef CONFIG_PPC64 | |
1240 | if (s > 1) { | |
1241 | r <<= 32; | |
1242 | r |= *(p++); | |
1243 | s--; | |
1244 | } | |
1245 | #endif | |
1246 | ||
1247 | *cellp = p; | |
1248 | return r; | |
1249 | } | |
1250 | ||
1251 | ||
1252 | static int __init early_init_dt_scan_memory(unsigned long node, | |
1253 | const char *uname, int depth, void *data) | |
1254 | { | |
3c726f8d | 1255 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
9b6b563c PM |
1256 | cell_t *reg, *endp; |
1257 | unsigned long l; | |
1258 | ||
1259 | /* We are scanning "memory" nodes only */ | |
a23414be PM |
1260 | if (type == NULL) { |
1261 | /* | |
1262 | * The longtrail doesn't have a device_type on the | |
1263 | * /memory node, so look for the node called /memory@0. | |
1264 | */ | |
1265 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
1266 | return 0; | |
1267 | } else if (strcmp(type, "memory") != 0) | |
9b6b563c PM |
1268 | return 0; |
1269 | ||
3c726f8d | 1270 | reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); |
9b6b563c PM |
1271 | if (reg == NULL) |
1272 | return 0; | |
1273 | ||
1274 | endp = reg + (l / sizeof(cell_t)); | |
1275 | ||
358c86fd | 1276 | DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
9b6b563c PM |
1277 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
1278 | ||
1279 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1280 | unsigned long base, size; | |
1281 | ||
1282 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1283 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1284 | ||
1285 | if (size == 0) | |
1286 | continue; | |
1287 | DBG(" - %lx , %lx\n", base, size); | |
1288 | #ifdef CONFIG_PPC64 | |
1289 | if (iommu_is_off) { | |
1290 | if (base >= 0x80000000ul) | |
1291 | continue; | |
1292 | if ((base + size) > 0x80000000ul) | |
1293 | size = 0x80000000ul - base; | |
1294 | } | |
1295 | #endif | |
1296 | lmb_add(base, size); | |
1297 | } | |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | static void __init early_reserve_mem(void) | |
1302 | { | |
1303 | unsigned long base, size; | |
1304 | unsigned long *reserve_map; | |
1305 | ||
1306 | reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) + | |
1307 | initial_boot_params->off_mem_rsvmap); | |
1308 | while (1) { | |
1309 | base = *(reserve_map++); | |
1310 | size = *(reserve_map++); | |
1311 | if (size == 0) | |
1312 | break; | |
1313 | DBG("reserving: %lx -> %lx\n", base, size); | |
1314 | lmb_reserve(base, size); | |
1315 | } | |
1316 | ||
1317 | #if 0 | |
1318 | DBG("memory reserved, lmbs :\n"); | |
1319 | lmb_dump_all(); | |
1320 | #endif | |
1321 | } | |
1322 | ||
1323 | void __init early_init_devtree(void *params) | |
1324 | { | |
1325 | DBG(" -> early_init_devtree()\n"); | |
1326 | ||
1327 | /* Setup flat device-tree pointer */ | |
1328 | initial_boot_params = params; | |
1329 | ||
1330 | /* Retrieve various informations from the /chosen node of the | |
1331 | * device-tree, including the platform type, initrd location and | |
1332 | * size, TCE reserve, and more ... | |
1333 | */ | |
3c726f8d | 1334 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
9b6b563c PM |
1335 | |
1336 | /* Scan memory nodes and rebuild LMBs */ | |
1337 | lmb_init(); | |
3c726f8d BH |
1338 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
1339 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
9b6b563c PM |
1340 | lmb_enforce_memory_limit(memory_limit); |
1341 | lmb_analyze(); | |
9b6b563c PM |
1342 | lmb_reserve(0, __pa(klimit)); |
1343 | ||
1344 | DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); | |
1345 | ||
1346 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ | |
1347 | early_reserve_mem(); | |
1348 | ||
1349 | DBG("Scanning CPUs ...\n"); | |
1350 | ||
3c726f8d BH |
1351 | /* Retreive CPU related informations from the flat tree |
1352 | * (altivec support, boot CPU ID, ...) | |
9b6b563c | 1353 | */ |
3c726f8d | 1354 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
9b6b563c | 1355 | |
9b6b563c PM |
1356 | DBG(" <- early_init_devtree()\n"); |
1357 | } | |
1358 | ||
1359 | #undef printk | |
1360 | ||
1361 | int | |
1362 | prom_n_addr_cells(struct device_node* np) | |
1363 | { | |
1364 | int* ip; | |
1365 | do { | |
1366 | if (np->parent) | |
1367 | np = np->parent; | |
1368 | ip = (int *) get_property(np, "#address-cells", NULL); | |
1369 | if (ip != NULL) | |
1370 | return *ip; | |
1371 | } while (np->parent); | |
1372 | /* No #address-cells property for the root node, default to 1 */ | |
1373 | return 1; | |
1374 | } | |
1375 | ||
1376 | int | |
1377 | prom_n_size_cells(struct device_node* np) | |
1378 | { | |
1379 | int* ip; | |
1380 | do { | |
1381 | if (np->parent) | |
1382 | np = np->parent; | |
1383 | ip = (int *) get_property(np, "#size-cells", NULL); | |
1384 | if (ip != NULL) | |
1385 | return *ip; | |
1386 | } while (np->parent); | |
1387 | /* No #size-cells property for the root node, default to 1 */ | |
1388 | return 1; | |
1389 | } | |
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; | |
1576 | for (; np != 0; np = np->allnext) | |
1577 | if (np->name != 0 && strcasecmp(np->name, name) == 0 | |
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; | |
1805 | } | |
1806 | kfree(node->intrs); | |
1807 | kfree(node->addrs); | |
1808 | kfree(node->full_name); | |
1809 | kfree(node->data); | |
1810 | kfree(node); | |
1811 | } | |
1812 | ||
1813 | /** | |
1814 | * of_node_put - Decrement refcount of a node | |
1815 | * @node: Node to dec refcount, NULL is supported to | |
1816 | * simplify writing of callers | |
1817 | * | |
1818 | */ | |
1819 | void of_node_put(struct device_node *node) | |
1820 | { | |
1821 | if (node) | |
1822 | kref_put(&node->kref, of_node_release); | |
1823 | } | |
1824 | EXPORT_SYMBOL(of_node_put); | |
1825 | ||
1826 | /* | |
1827 | * Plug a device node into the tree and global list. | |
1828 | */ | |
1829 | void of_attach_node(struct device_node *np) | |
1830 | { | |
1831 | write_lock(&devtree_lock); | |
1832 | np->sibling = np->parent->child; | |
1833 | np->allnext = allnodes; | |
1834 | np->parent->child = np; | |
1835 | allnodes = np; | |
1836 | write_unlock(&devtree_lock); | |
1837 | } | |
1838 | ||
1839 | /* | |
1840 | * "Unplug" a node from the device tree. The caller must hold | |
1841 | * a reference to the node. The memory associated with the node | |
1842 | * is not freed until its refcount goes to zero. | |
1843 | */ | |
1844 | void of_detach_node(const struct device_node *np) | |
1845 | { | |
1846 | struct device_node *parent; | |
1847 | ||
1848 | write_lock(&devtree_lock); | |
1849 | ||
1850 | parent = np->parent; | |
1851 | ||
1852 | if (allnodes == np) | |
1853 | allnodes = np->allnext; | |
1854 | else { | |
1855 | struct device_node *prev; | |
1856 | for (prev = allnodes; | |
1857 | prev->allnext != np; | |
1858 | prev = prev->allnext) | |
1859 | ; | |
1860 | prev->allnext = np->allnext; | |
1861 | } | |
1862 | ||
1863 | if (parent->child == np) | |
1864 | parent->child = np->sibling; | |
1865 | else { | |
1866 | struct device_node *prevsib; | |
1867 | for (prevsib = np->parent->child; | |
1868 | prevsib->sibling != np; | |
1869 | prevsib = prevsib->sibling) | |
1870 | ; | |
1871 | prevsib->sibling = np->sibling; | |
1872 | } | |
1873 | ||
1874 | write_unlock(&devtree_lock); | |
1875 | } | |
1876 | ||
1877 | #ifdef CONFIG_PPC_PSERIES | |
1878 | /* | |
1879 | * Fix up the uninitialized fields in a new device node: | |
1880 | * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields | |
1881 | * | |
1882 | * A lot of boot-time code is duplicated here, because functions such | |
1883 | * as finish_node_interrupts, interpret_pci_props, etc. cannot use the | |
1884 | * slab allocator. | |
1885 | * | |
1886 | * This should probably be split up into smaller chunks. | |
1887 | */ | |
1888 | ||
1889 | static int of_finish_dynamic_node(struct device_node *node, | |
1890 | unsigned long *unused1, int unused2, | |
1891 | int unused3, int unused4) | |
1892 | { | |
1893 | struct device_node *parent = of_get_parent(node); | |
1894 | int err = 0; | |
1895 | phandle *ibm_phandle; | |
1896 | ||
1897 | node->name = get_property(node, "name", NULL); | |
1898 | node->type = get_property(node, "device_type", NULL); | |
1899 | ||
1900 | if (!parent) { | |
1901 | err = -ENODEV; | |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | /* We don't support that function on PowerMac, at least | |
1906 | * not yet | |
1907 | */ | |
799d6046 | 1908 | if (_machine == PLATFORM_POWERMAC) |
9b6b563c PM |
1909 | return -ENODEV; |
1910 | ||
1911 | /* fix up new node's linux_phandle field */ | |
1912 | if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL))) | |
1913 | node->linux_phandle = *ibm_phandle; | |
1914 | ||
1915 | out: | |
1916 | of_node_put(parent); | |
1917 | return err; | |
1918 | } | |
1919 | ||
1920 | static int prom_reconfig_notifier(struct notifier_block *nb, | |
1921 | unsigned long action, void *node) | |
1922 | { | |
1923 | int err; | |
1924 | ||
1925 | switch (action) { | |
1926 | case PSERIES_RECONFIG_ADD: | |
1927 | err = finish_node(node, NULL, of_finish_dynamic_node, 0, 0, 0); | |
1928 | if (err < 0) { | |
1929 | printk(KERN_ERR "finish_node returned %d\n", err); | |
1930 | err = NOTIFY_BAD; | |
1931 | } | |
1932 | break; | |
1933 | default: | |
1934 | err = NOTIFY_DONE; | |
1935 | break; | |
1936 | } | |
1937 | return err; | |
1938 | } | |
1939 | ||
1940 | static struct notifier_block prom_reconfig_nb = { | |
1941 | .notifier_call = prom_reconfig_notifier, | |
1942 | .priority = 10, /* This one needs to run first */ | |
1943 | }; | |
1944 | ||
1945 | static int __init prom_reconfig_setup(void) | |
1946 | { | |
1947 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); | |
1948 | } | |
1949 | __initcall(prom_reconfig_setup); | |
1950 | #endif | |
1951 | ||
1952 | /* | |
1953 | * Find a property with a given name for a given node | |
1954 | * and return the value. | |
1955 | */ | |
1956 | unsigned char *get_property(struct device_node *np, const char *name, | |
1957 | int *lenp) | |
1958 | { | |
1959 | struct property *pp; | |
1960 | ||
1961 | for (pp = np->properties; pp != 0; pp = pp->next) | |
1962 | if (strcmp(pp->name, name) == 0) { | |
1963 | if (lenp != 0) | |
1964 | *lenp = pp->length; | |
1965 | return pp->value; | |
1966 | } | |
1967 | return NULL; | |
1968 | } | |
1969 | EXPORT_SYMBOL(get_property); | |
1970 | ||
1971 | /* | |
1972 | * Add a property to a node | |
1973 | */ | |
183d0202 | 1974 | int prom_add_property(struct device_node* np, struct property* prop) |
9b6b563c | 1975 | { |
183d0202 | 1976 | struct property **next; |
9b6b563c PM |
1977 | |
1978 | prop->next = NULL; | |
183d0202 BH |
1979 | write_lock(&devtree_lock); |
1980 | next = &np->properties; | |
1981 | while (*next) { | |
1982 | if (strcmp(prop->name, (*next)->name) == 0) { | |
1983 | /* duplicate ! don't insert it */ | |
1984 | write_unlock(&devtree_lock); | |
1985 | return -1; | |
1986 | } | |
9b6b563c | 1987 | next = &(*next)->next; |
183d0202 | 1988 | } |
9b6b563c | 1989 | *next = prop; |
183d0202 BH |
1990 | write_unlock(&devtree_lock); |
1991 | ||
799d6046 | 1992 | #ifdef CONFIG_PROC_DEVICETREE |
183d0202 BH |
1993 | /* try to add to proc as well if it was initialized */ |
1994 | if (np->pde) | |
1995 | proc_device_tree_add_prop(np->pde, prop); | |
799d6046 | 1996 | #endif /* CONFIG_PROC_DEVICETREE */ |
183d0202 BH |
1997 | |
1998 | return 0; | |
9b6b563c PM |
1999 | } |
2000 | ||
2001 | /* I quickly hacked that one, check against spec ! */ | |
2002 | static inline unsigned long | |
2003 | bus_space_to_resource_flags(unsigned int bus_space) | |
2004 | { | |
2005 | u8 space = (bus_space >> 24) & 0xf; | |
2006 | if (space == 0) | |
2007 | space = 0x02; | |
2008 | if (space == 0x02) | |
2009 | return IORESOURCE_MEM; | |
2010 | else if (space == 0x01) | |
2011 | return IORESOURCE_IO; | |
2012 | else { | |
2013 | printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n", | |
2014 | bus_space); | |
2015 | return 0; | |
2016 | } | |
2017 | } | |
2018 | ||
60dda256 | 2019 | #ifdef CONFIG_PCI |
9b6b563c PM |
2020 | static struct resource *find_parent_pci_resource(struct pci_dev* pdev, |
2021 | struct address_range *range) | |
2022 | { | |
2023 | unsigned long mask; | |
2024 | int i; | |
2025 | ||
2026 | /* Check this one */ | |
2027 | mask = bus_space_to_resource_flags(range->space); | |
2028 | for (i=0; i<DEVICE_COUNT_RESOURCE; i++) { | |
2029 | if ((pdev->resource[i].flags & mask) == mask && | |
2030 | pdev->resource[i].start <= range->address && | |
2031 | pdev->resource[i].end > range->address) { | |
2032 | if ((range->address + range->size - 1) > pdev->resource[i].end) { | |
2033 | /* Add better message */ | |
2034 | printk(KERN_WARNING "PCI/OF resource overlap !\n"); | |
2035 | return NULL; | |
2036 | } | |
2037 | break; | |
2038 | } | |
2039 | } | |
2040 | if (i == DEVICE_COUNT_RESOURCE) | |
2041 | return NULL; | |
2042 | return &pdev->resource[i]; | |
2043 | } | |
2044 | ||
2045 | /* | |
2046 | * Request an OF device resource. Currently handles child of PCI devices, | |
2047 | * or other nodes attached to the root node. Ultimately, put some | |
2048 | * link to resources in the OF node. | |
2049 | */ | |
2050 | struct resource *request_OF_resource(struct device_node* node, int index, | |
2051 | const char* name_postfix) | |
2052 | { | |
2053 | struct pci_dev* pcidev; | |
2054 | u8 pci_bus, pci_devfn; | |
2055 | unsigned long iomask; | |
2056 | struct device_node* nd; | |
2057 | struct resource* parent; | |
2058 | struct resource *res = NULL; | |
2059 | int nlen, plen; | |
2060 | ||
2061 | if (index >= node->n_addrs) | |
2062 | goto fail; | |
2063 | ||
2064 | /* Sanity check on bus space */ | |
2065 | iomask = bus_space_to_resource_flags(node->addrs[index].space); | |
2066 | if (iomask & IORESOURCE_MEM) | |
2067 | parent = &iomem_resource; | |
2068 | else if (iomask & IORESOURCE_IO) | |
2069 | parent = &ioport_resource; | |
2070 | else | |
2071 | goto fail; | |
2072 | ||
2073 | /* Find a PCI parent if any */ | |
2074 | nd = node; | |
2075 | pcidev = NULL; | |
2076 | while (nd) { | |
2077 | if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) | |
2078 | pcidev = pci_find_slot(pci_bus, pci_devfn); | |
2079 | if (pcidev) break; | |
2080 | nd = nd->parent; | |
2081 | } | |
2082 | if (pcidev) | |
2083 | parent = find_parent_pci_resource(pcidev, &node->addrs[index]); | |
2084 | if (!parent) { | |
2085 | printk(KERN_WARNING "request_OF_resource(%s), parent not found\n", | |
2086 | node->name); | |
2087 | goto fail; | |
2088 | } | |
2089 | ||
2090 | res = __request_region(parent, node->addrs[index].address, | |
2091 | node->addrs[index].size, NULL); | |
2092 | if (!res) | |
2093 | goto fail; | |
2094 | nlen = strlen(node->name); | |
2095 | plen = name_postfix ? strlen(name_postfix) : 0; | |
2096 | res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL); | |
2097 | if (res->name) { | |
2098 | strcpy((char *)res->name, node->name); | |
2099 | if (plen) | |
2100 | strcpy((char *)res->name+nlen, name_postfix); | |
2101 | } | |
2102 | return res; | |
2103 | fail: | |
2104 | return NULL; | |
2105 | } | |
2106 | EXPORT_SYMBOL(request_OF_resource); | |
2107 | ||
2108 | int release_OF_resource(struct device_node *node, int index) | |
2109 | { | |
2110 | struct pci_dev* pcidev; | |
2111 | u8 pci_bus, pci_devfn; | |
2112 | unsigned long iomask, start, end; | |
2113 | struct device_node* nd; | |
2114 | struct resource* parent; | |
2115 | struct resource *res = NULL; | |
2116 | ||
2117 | if (index >= node->n_addrs) | |
2118 | return -EINVAL; | |
2119 | ||
2120 | /* Sanity check on bus space */ | |
2121 | iomask = bus_space_to_resource_flags(node->addrs[index].space); | |
2122 | if (iomask & IORESOURCE_MEM) | |
2123 | parent = &iomem_resource; | |
2124 | else if (iomask & IORESOURCE_IO) | |
2125 | parent = &ioport_resource; | |
2126 | else | |
2127 | return -EINVAL; | |
2128 | ||
2129 | /* Find a PCI parent if any */ | |
2130 | nd = node; | |
2131 | pcidev = NULL; | |
2132 | while(nd) { | |
2133 | if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) | |
2134 | pcidev = pci_find_slot(pci_bus, pci_devfn); | |
2135 | if (pcidev) break; | |
2136 | nd = nd->parent; | |
2137 | } | |
2138 | if (pcidev) | |
2139 | parent = find_parent_pci_resource(pcidev, &node->addrs[index]); | |
2140 | if (!parent) { | |
2141 | printk(KERN_WARNING "release_OF_resource(%s), parent not found\n", | |
2142 | node->name); | |
2143 | return -ENODEV; | |
2144 | } | |
2145 | ||
2146 | /* Find us in the parent and its childs */ | |
2147 | res = parent->child; | |
2148 | start = node->addrs[index].address; | |
2149 | end = start + node->addrs[index].size - 1; | |
2150 | while (res) { | |
2151 | if (res->start == start && res->end == end && | |
2152 | (res->flags & IORESOURCE_BUSY)) | |
2153 | break; | |
2154 | if (res->start <= start && res->end >= end) | |
2155 | res = res->child; | |
2156 | else | |
2157 | res = res->sibling; | |
2158 | } | |
2159 | if (!res) | |
2160 | return -ENODEV; | |
2161 | ||
2162 | if (res->name) { | |
2163 | kfree(res->name); | |
2164 | res->name = NULL; | |
2165 | } | |
2166 | release_resource(res); | |
2167 | kfree(res); | |
2168 | ||
2169 | return 0; | |
2170 | } | |
2171 | EXPORT_SYMBOL(release_OF_resource); | |
60dda256 | 2172 | #endif /* CONFIG_PCI */ |