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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/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/module.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/lmb.h>
35
36 #include <asm/prom.h>
37 #include <asm/rtas.h>
38 #include <asm/page.h>
39 #include <asm/processor.h>
40 #include <asm/irq.h>
41 #include <asm/io.h>
42 #include <asm/kdump.h>
43 #include <asm/smp.h>
44 #include <asm/system.h>
45 #include <asm/mmu.h>
46 #include <asm/pgtable.h>
47 #include <asm/pci.h>
48 #include <asm/iommu.h>
49 #include <asm/btext.h>
50 #include <asm/sections.h>
51 #include <asm/machdep.h>
52 #include <asm/pSeries_reconfig.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/phyp_dump.h>
55 #include <asm/kexec.h>
56
57 #ifdef DEBUG
58 #define DBG(fmt...) printk(KERN_ERR fmt)
59 #else
60 #define DBG(fmt...)
61 #endif
62
63
64 static int __initdata dt_root_addr_cells;
65 static int __initdata dt_root_size_cells;
66
67 #ifdef CONFIG_PPC64
68 int __initdata iommu_is_off;
69 int __initdata iommu_force_on;
70 unsigned long tce_alloc_start, tce_alloc_end;
71 #endif
72
73 typedef u32 cell_t;
74
75 #if 0
76 static struct boot_param_header *initial_boot_params __initdata;
77 #else
78 struct boot_param_header *initial_boot_params;
79 #endif
80
81 extern struct device_node *allnodes;    /* temporary while merging */
82
83 extern rwlock_t devtree_lock;   /* temporary while merging */
84
85 /* export that to outside world */
86 struct device_node *of_chosen;
87
88 static inline char *find_flat_dt_string(u32 offset)
89 {
90         return ((char *)initial_boot_params) +
91                 initial_boot_params->off_dt_strings + offset;
92 }
93
94 /**
95  * This function is used to scan the flattened device-tree, it is
96  * used to extract the memory informations at boot before we can
97  * unflatten the tree
98  */
99 int __init of_scan_flat_dt(int (*it)(unsigned long node,
100                                      const char *uname, int depth,
101                                      void *data),
102                            void *data)
103 {
104         unsigned long p = ((unsigned long)initial_boot_params) +
105                 initial_boot_params->off_dt_struct;
106         int rc = 0;
107         int depth = -1;
108
109         do {
110                 u32 tag = *((u32 *)p);
111                 char *pathp;
112                 
113                 p += 4;
114                 if (tag == OF_DT_END_NODE) {
115                         depth --;
116                         continue;
117                 }
118                 if (tag == OF_DT_NOP)
119                         continue;
120                 if (tag == OF_DT_END)
121                         break;
122                 if (tag == OF_DT_PROP) {
123                         u32 sz = *((u32 *)p);
124                         p += 8;
125                         if (initial_boot_params->version < 0x10)
126                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
127                         p += sz;
128                         p = _ALIGN(p, 4);
129                         continue;
130                 }
131                 if (tag != OF_DT_BEGIN_NODE) {
132                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
133                                " device tree !\n", tag);
134                         return -EINVAL;
135                 }
136                 depth++;
137                 pathp = (char *)p;
138                 p = _ALIGN(p + strlen(pathp) + 1, 4);
139                 if ((*pathp) == '/') {
140                         char *lp, *np;
141                         for (lp = NULL, np = pathp; *np; np++)
142                                 if ((*np) == '/')
143                                         lp = np+1;
144                         if (lp != NULL)
145                                 pathp = lp;
146                 }
147                 rc = it(p, pathp, depth, data);
148                 if (rc != 0)
149                         break;          
150         } while(1);
151
152         return rc;
153 }
154
155 unsigned long __init of_get_flat_dt_root(void)
156 {
157         unsigned long p = ((unsigned long)initial_boot_params) +
158                 initial_boot_params->off_dt_struct;
159
160         while(*((u32 *)p) == OF_DT_NOP)
161                 p += 4;
162         BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
163         p += 4;
164         return _ALIGN(p + strlen((char *)p) + 1, 4);
165 }
166
167 /**
168  * This  function can be used within scan_flattened_dt callback to get
169  * access to properties
170  */
171 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
172                                  unsigned long *size)
173 {
174         unsigned long p = node;
175
176         do {
177                 u32 tag = *((u32 *)p);
178                 u32 sz, noff;
179                 const char *nstr;
180
181                 p += 4;
182                 if (tag == OF_DT_NOP)
183                         continue;
184                 if (tag != OF_DT_PROP)
185                         return NULL;
186
187                 sz = *((u32 *)p);
188                 noff = *((u32 *)(p + 4));
189                 p += 8;
190                 if (initial_boot_params->version < 0x10)
191                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
192
193                 nstr = find_flat_dt_string(noff);
194                 if (nstr == NULL) {
195                         printk(KERN_WARNING "Can't find property index"
196                                " name !\n");
197                         return NULL;
198                 }
199                 if (strcmp(name, nstr) == 0) {
200                         if (size)
201                                 *size = sz;
202                         return (void *)p;
203                 }
204                 p += sz;
205                 p = _ALIGN(p, 4);
206         } while(1);
207 }
208
209 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
210 {
211         const char* cp;
212         unsigned long cplen, l;
213
214         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
215         if (cp == NULL)
216                 return 0;
217         while (cplen > 0) {
218                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
219                         return 1;
220                 l = strlen(cp) + 1;
221                 cp += l;
222                 cplen -= l;
223         }
224
225         return 0;
226 }
227
228 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
229                                        unsigned long align)
230 {
231         void *res;
232
233         *mem = _ALIGN(*mem, align);
234         res = (void *)*mem;
235         *mem += size;
236
237         return res;
238 }
239
240 static unsigned long __init unflatten_dt_node(unsigned long mem,
241                                               unsigned long *p,
242                                               struct device_node *dad,
243                                               struct device_node ***allnextpp,
244                                               unsigned long fpsize)
245 {
246         struct device_node *np;
247         struct property *pp, **prev_pp = NULL;
248         char *pathp;
249         u32 tag;
250         unsigned int l, allocl;
251         int has_name = 0;
252         int new_format = 0;
253
254         tag = *((u32 *)(*p));
255         if (tag != OF_DT_BEGIN_NODE) {
256                 printk("Weird tag at start of node: %x\n", tag);
257                 return mem;
258         }
259         *p += 4;
260         pathp = (char *)*p;
261         l = allocl = strlen(pathp) + 1;
262         *p = _ALIGN(*p + l, 4);
263
264         /* version 0x10 has a more compact unit name here instead of the full
265          * path. we accumulate the full path size using "fpsize", we'll rebuild
266          * it later. We detect this because the first character of the name is
267          * not '/'.
268          */
269         if ((*pathp) != '/') {
270                 new_format = 1;
271                 if (fpsize == 0) {
272                         /* root node: special case. fpsize accounts for path
273                          * plus terminating zero. root node only has '/', so
274                          * fpsize should be 2, but we want to avoid the first
275                          * level nodes to have two '/' so we use fpsize 1 here
276                          */
277                         fpsize = 1;
278                         allocl = 2;
279                 } else {
280                         /* account for '/' and path size minus terminal 0
281                          * already in 'l'
282                          */
283                         fpsize += l;
284                         allocl = fpsize;
285                 }
286         }
287
288
289         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
290                                 __alignof__(struct device_node));
291         if (allnextpp) {
292                 memset(np, 0, sizeof(*np));
293                 np->full_name = ((char*)np) + sizeof(struct device_node);
294                 if (new_format) {
295                         char *p = np->full_name;
296                         /* rebuild full path for new format */
297                         if (dad && dad->parent) {
298                                 strcpy(p, dad->full_name);
299 #ifdef DEBUG
300                                 if ((strlen(p) + l + 1) != allocl) {
301                                         DBG("%s: p: %d, l: %d, a: %d\n",
302                                             pathp, (int)strlen(p), l, allocl);
303                                 }
304 #endif
305                                 p += strlen(p);
306                         }
307                         *(p++) = '/';
308                         memcpy(p, pathp, l);
309                 } else
310                         memcpy(np->full_name, pathp, l);
311                 prev_pp = &np->properties;
312                 **allnextpp = np;
313                 *allnextpp = &np->allnext;
314                 if (dad != NULL) {
315                         np->parent = dad;
316                         /* we temporarily use the next field as `last_child'*/
317                         if (dad->next == 0)
318                                 dad->child = np;
319                         else
320                                 dad->next->sibling = np;
321                         dad->next = np;
322                 }
323                 kref_init(&np->kref);
324         }
325         while(1) {
326                 u32 sz, noff;
327                 char *pname;
328
329                 tag = *((u32 *)(*p));
330                 if (tag == OF_DT_NOP) {
331                         *p += 4;
332                         continue;
333                 }
334                 if (tag != OF_DT_PROP)
335                         break;
336                 *p += 4;
337                 sz = *((u32 *)(*p));
338                 noff = *((u32 *)((*p) + 4));
339                 *p += 8;
340                 if (initial_boot_params->version < 0x10)
341                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
342
343                 pname = find_flat_dt_string(noff);
344                 if (pname == NULL) {
345                         printk("Can't find property name in list !\n");
346                         break;
347                 }
348                 if (strcmp(pname, "name") == 0)
349                         has_name = 1;
350                 l = strlen(pname) + 1;
351                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
352                                         __alignof__(struct property));
353                 if (allnextpp) {
354                         if (strcmp(pname, "linux,phandle") == 0) {
355                                 np->node = *((u32 *)*p);
356                                 if (np->linux_phandle == 0)
357                                         np->linux_phandle = np->node;
358                         }
359                         if (strcmp(pname, "ibm,phandle") == 0)
360                                 np->linux_phandle = *((u32 *)*p);
361                         pp->name = pname;
362                         pp->length = sz;
363                         pp->value = (void *)*p;
364                         *prev_pp = pp;
365                         prev_pp = &pp->next;
366                 }
367                 *p = _ALIGN((*p) + sz, 4);
368         }
369         /* with version 0x10 we may not have the name property, recreate
370          * it here from the unit name if absent
371          */
372         if (!has_name) {
373                 char *p = pathp, *ps = pathp, *pa = NULL;
374                 int sz;
375
376                 while (*p) {
377                         if ((*p) == '@')
378                                 pa = p;
379                         if ((*p) == '/')
380                                 ps = p + 1;
381                         p++;
382                 }
383                 if (pa < ps)
384                         pa = p;
385                 sz = (pa - ps) + 1;
386                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
387                                         __alignof__(struct property));
388                 if (allnextpp) {
389                         pp->name = "name";
390                         pp->length = sz;
391                         pp->value = pp + 1;
392                         *prev_pp = pp;
393                         prev_pp = &pp->next;
394                         memcpy(pp->value, ps, sz - 1);
395                         ((char *)pp->value)[sz - 1] = 0;
396                         DBG("fixed up name for %s -> %s\n", pathp,
397                                 (char *)pp->value);
398                 }
399         }
400         if (allnextpp) {
401                 *prev_pp = NULL;
402                 np->name = of_get_property(np, "name", NULL);
403                 np->type = of_get_property(np, "device_type", NULL);
404
405                 if (!np->name)
406                         np->name = "<NULL>";
407                 if (!np->type)
408                         np->type = "<NULL>";
409         }
410         while (tag == OF_DT_BEGIN_NODE) {
411                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
412                 tag = *((u32 *)(*p));
413         }
414         if (tag != OF_DT_END_NODE) {
415                 printk("Weird tag at end of node: %x\n", tag);
416                 return mem;
417         }
418         *p += 4;
419         return mem;
420 }
421
422 static int __init early_parse_mem(char *p)
423 {
424         if (!p)
425                 return 1;
426
427         memory_limit = PAGE_ALIGN(memparse(p, &p));
428         DBG("memory limit = 0x%lx\n", memory_limit);
429
430         return 0;
431 }
432 early_param("mem", early_parse_mem);
433
434 /**
435  * move_device_tree - move tree to an unused area, if needed.
436  *
437  * The device tree may be allocated beyond our memory limit, or inside the
438  * crash kernel region for kdump. If so, move it out of the way.
439  */
440 static void __init move_device_tree(void)
441 {
442         unsigned long start, size;
443         void *p;
444
445         DBG("-> move_device_tree\n");
446
447         start = __pa(initial_boot_params);
448         size = initial_boot_params->totalsize;
449
450         if ((memory_limit && (start + size) > memory_limit) ||
451                         overlaps_crashkernel(start, size)) {
452                 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
453                 memcpy(p, initial_boot_params, size);
454                 initial_boot_params = (struct boot_param_header *)p;
455                 DBG("Moved device tree to 0x%p\n", p);
456         }
457
458         DBG("<- move_device_tree\n");
459 }
460
461 /**
462  * unflattens the device-tree passed by the firmware, creating the
463  * tree of struct device_node. It also fills the "name" and "type"
464  * pointers of the nodes so the normal device-tree walking functions
465  * can be used (this used to be done by finish_device_tree)
466  */
467 void __init unflatten_device_tree(void)
468 {
469         unsigned long start, mem, size;
470         struct device_node **allnextp = &allnodes;
471
472         DBG(" -> unflatten_device_tree()\n");
473
474         /* First pass, scan for size */
475         start = ((unsigned long)initial_boot_params) +
476                 initial_boot_params->off_dt_struct;
477         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
478         size = (size | 3) + 1;
479
480         DBG("  size is %lx, allocating...\n", size);
481
482         /* Allocate memory for the expanded device tree */
483         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
484         mem = (unsigned long) __va(mem);
485
486         ((u32 *)mem)[size / 4] = 0xdeadbeef;
487
488         DBG("  unflattening %lx...\n", mem);
489
490         /* Second pass, do actual unflattening */
491         start = ((unsigned long)initial_boot_params) +
492                 initial_boot_params->off_dt_struct;
493         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
494         if (*((u32 *)start) != OF_DT_END)
495                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
496         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
497                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
498                        ((u32 *)mem)[size / 4] );
499         *allnextp = NULL;
500
501         /* Get pointer to OF "/chosen" node for use everywhere */
502         of_chosen = of_find_node_by_path("/chosen");
503         if (of_chosen == NULL)
504                 of_chosen = of_find_node_by_path("/chosen@0");
505
506         DBG(" <- unflatten_device_tree()\n");
507 }
508
509 /*
510  * ibm,pa-features is a per-cpu property that contains a string of
511  * attribute descriptors, each of which has a 2 byte header plus up
512  * to 254 bytes worth of processor attribute bits.  First header
513  * byte specifies the number of bytes following the header.
514  * Second header byte is an "attribute-specifier" type, of which
515  * zero is the only currently-defined value.
516  * Implementation:  Pass in the byte and bit offset for the feature
517  * that we are interested in.  The function will return -1 if the
518  * pa-features property is missing, or a 1/0 to indicate if the feature
519  * is supported/not supported.  Note that the bit numbers are
520  * big-endian to match the definition in PAPR.
521  */
522 static struct ibm_pa_feature {
523         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
524         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
525         unsigned char   pabyte;         /* byte number in ibm,pa-features */
526         unsigned char   pabit;          /* bit number (big-endian) */
527         unsigned char   invert;         /* if 1, pa bit set => clear feature */
528 } ibm_pa_features[] __initdata = {
529         {0, PPC_FEATURE_HAS_MMU,        0, 0, 0},
530         {0, PPC_FEATURE_HAS_FPU,        0, 1, 0},
531         {CPU_FTR_SLB, 0,                0, 2, 0},
532         {CPU_FTR_CTRL, 0,               0, 3, 0},
533         {CPU_FTR_NOEXECUTE, 0,          0, 6, 0},
534         {CPU_FTR_NODSISRALIGN, 0,       1, 1, 1},
535         {CPU_FTR_CI_LARGE_PAGE, 0,      1, 2, 0},
536         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
537 };
538
539 static void __init scan_features(unsigned long node, unsigned char *ftrs,
540                                  unsigned long tablelen,
541                                  struct ibm_pa_feature *fp,
542                                  unsigned long ft_size)
543 {
544         unsigned long i, len, bit;
545
546         /* find descriptor with type == 0 */
547         for (;;) {
548                 if (tablelen < 3)
549                         return;
550                 len = 2 + ftrs[0];
551                 if (tablelen < len)
552                         return;         /* descriptor 0 not found */
553                 if (ftrs[1] == 0)
554                         break;
555                 tablelen -= len;
556                 ftrs += len;
557         }
558
559         /* loop over bits we know about */
560         for (i = 0; i < ft_size; ++i, ++fp) {
561                 if (fp->pabyte >= ftrs[0])
562                         continue;
563                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
564                 if (bit ^ fp->invert) {
565                         cur_cpu_spec->cpu_features |= fp->cpu_features;
566                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
567                 } else {
568                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
569                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
570                 }
571         }
572 }
573
574 static void __init check_cpu_pa_features(unsigned long node)
575 {
576         unsigned char *pa_ftrs;
577         unsigned long tablelen;
578
579         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
580         if (pa_ftrs == NULL)
581                 return;
582
583         scan_features(node, pa_ftrs, tablelen,
584                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
585 }
586
587 #ifdef CONFIG_PPC64
588 static void __init check_cpu_slb_size(unsigned long node)
589 {
590         u32 *slb_size_ptr;
591
592         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
593         if (slb_size_ptr != NULL) {
594                 mmu_slb_size = *slb_size_ptr;
595         }
596 }
597 #else
598 #define check_cpu_slb_size(node) do { } while(0)
599 #endif
600
601 static struct feature_property {
602         const char *name;
603         u32 min_value;
604         unsigned long cpu_feature;
605         unsigned long cpu_user_ftr;
606 } feature_properties[] __initdata = {
607 #ifdef CONFIG_ALTIVEC
608         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
609         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
610 #endif /* CONFIG_ALTIVEC */
611 #ifdef CONFIG_PPC64
612         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
613         {"ibm,purr", 1, CPU_FTR_PURR, 0},
614         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
615 #endif /* CONFIG_PPC64 */
616 };
617
618 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
619 static inline void identical_pvr_fixup(unsigned long node)
620 {
621         unsigned int pvr;
622         char *model = of_get_flat_dt_prop(node, "model", NULL);
623
624         /*
625          * Since 440GR(x)/440EP(x) processors have the same pvr,
626          * we check the node path and set bit 28 in the cur_cpu_spec
627          * pvr for EP(x) processor version. This bit is always 0 in
628          * the "real" pvr. Then we call identify_cpu again with
629          * the new logical pvr to enable FPU support.
630          */
631         if (model && strstr(model, "440EP")) {
632                 pvr = cur_cpu_spec->pvr_value | 0x8;
633                 identify_cpu(0, pvr);
634                 DBG("Using logical pvr %x for %s\n", pvr, model);
635         }
636 }
637 #else
638 #define identical_pvr_fixup(node) do { } while(0)
639 #endif
640
641 static void __init check_cpu_feature_properties(unsigned long node)
642 {
643         unsigned long i;
644         struct feature_property *fp = feature_properties;
645         const u32 *prop;
646
647         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
648                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
649                 if (prop && *prop >= fp->min_value) {
650                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
651                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
652                 }
653         }
654 }
655
656 static int __init early_init_dt_scan_cpus(unsigned long node,
657                                           const char *uname, int depth,
658                                           void *data)
659 {
660         static int logical_cpuid = 0;
661         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
662         const u32 *prop;
663         const u32 *intserv;
664         int i, nthreads;
665         unsigned long len;
666         int found = 0;
667
668         /* We are scanning "cpu" nodes only */
669         if (type == NULL || strcmp(type, "cpu") != 0)
670                 return 0;
671
672         /* Get physical cpuid */
673         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
674         if (intserv) {
675                 nthreads = len / sizeof(int);
676         } else {
677                 intserv = of_get_flat_dt_prop(node, "reg", NULL);
678                 nthreads = 1;
679         }
680
681         /*
682          * Now see if any of these threads match our boot cpu.
683          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
684          */
685         for (i = 0; i < nthreads; i++) {
686                 /*
687                  * version 2 of the kexec param format adds the phys cpuid of
688                  * booted proc.
689                  */
690                 if (initial_boot_params && initial_boot_params->version >= 2) {
691                         if (intserv[i] ==
692                                         initial_boot_params->boot_cpuid_phys) {
693                                 found = 1;
694                                 break;
695                         }
696                 } else {
697                         /*
698                          * Check if it's the boot-cpu, set it's hw index now,
699                          * unfortunately this format did not support booting
700                          * off secondary threads.
701                          */
702                         if (of_get_flat_dt_prop(node,
703                                         "linux,boot-cpu", NULL) != NULL) {
704                                 found = 1;
705                                 break;
706                         }
707                 }
708
709 #ifdef CONFIG_SMP
710                 /* logical cpu id is always 0 on UP kernels */
711                 logical_cpuid++;
712 #endif
713         }
714
715         if (found) {
716                 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
717                         intserv[i]);
718                 boot_cpuid = logical_cpuid;
719                 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
720
721                 /*
722                  * PAPR defines "logical" PVR values for cpus that
723                  * meet various levels of the architecture:
724                  * 0x0f000001   Architecture version 2.04
725                  * 0x0f000002   Architecture version 2.05
726                  * If the cpu-version property in the cpu node contains
727                  * such a value, we call identify_cpu again with the
728                  * logical PVR value in order to use the cpu feature
729                  * bits appropriate for the architecture level.
730                  *
731                  * A POWER6 partition in "POWER6 architected" mode
732                  * uses the 0x0f000002 PVR value; in POWER5+ mode
733                  * it uses 0x0f000001.
734                  */
735                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
736                 if (prop && (*prop & 0xff000000) == 0x0f000000)
737                         identify_cpu(0, *prop);
738
739                 identical_pvr_fixup(node);
740         }
741
742         check_cpu_feature_properties(node);
743         check_cpu_pa_features(node);
744         check_cpu_slb_size(node);
745
746 #ifdef CONFIG_PPC_PSERIES
747         if (nthreads > 1)
748                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
749         else
750                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
751 #endif
752
753         return 0;
754 }
755
756 #ifdef CONFIG_BLK_DEV_INITRD
757 static void __init early_init_dt_check_for_initrd(unsigned long node)
758 {
759         unsigned long l;
760         u32 *prop;
761
762         DBG("Looking for initrd properties... ");
763
764         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
765         if (prop) {
766                 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
767
768                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
769                 if (prop) {
770                         initrd_end = (unsigned long)
771                                         __va(of_read_ulong(prop, l/4));
772                         initrd_below_start_ok = 1;
773                 } else {
774                         initrd_start = 0;
775                 }
776         }
777
778         DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
779 }
780 #else
781 static inline void early_init_dt_check_for_initrd(unsigned long node)
782 {
783 }
784 #endif /* CONFIG_BLK_DEV_INITRD */
785
786 static int __init early_init_dt_scan_chosen(unsigned long node,
787                                             const char *uname, int depth, void *data)
788 {
789         unsigned long *lprop;
790         unsigned long l;
791         char *p;
792
793         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
794
795         if (depth != 1 ||
796             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
797                 return 0;
798
799 #ifdef CONFIG_PPC64
800         /* check if iommu is forced on or off */
801         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
802                 iommu_is_off = 1;
803         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
804                 iommu_force_on = 1;
805 #endif
806
807         /* mem=x on the command line is the preferred mechanism */
808         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
809         if (lprop)
810                 memory_limit = *lprop;
811
812 #ifdef CONFIG_PPC64
813         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
814         if (lprop)
815                 tce_alloc_start = *lprop;
816         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
817         if (lprop)
818                 tce_alloc_end = *lprop;
819 #endif
820
821 #ifdef CONFIG_KEXEC
822         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
823         if (lprop)
824                 crashk_res.start = *lprop;
825
826         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
827         if (lprop)
828                 crashk_res.end = crashk_res.start + *lprop - 1;
829 #endif
830
831         early_init_dt_check_for_initrd(node);
832
833         /* Retreive command line */
834         p = of_get_flat_dt_prop(node, "bootargs", &l);
835         if (p != NULL && l > 0)
836                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
837
838 #ifdef CONFIG_CMDLINE
839         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
840                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
841 #endif /* CONFIG_CMDLINE */
842
843         DBG("Command line is: %s\n", cmd_line);
844
845         /* break now */
846         return 1;
847 }
848
849 static int __init early_init_dt_scan_root(unsigned long node,
850                                           const char *uname, int depth, void *data)
851 {
852         u32 *prop;
853
854         if (depth != 0)
855                 return 0;
856
857         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
858         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
859         DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
860
861         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
862         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
863         DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
864         
865         /* break now */
866         return 1;
867 }
868
869 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
870 {
871         cell_t *p = *cellp;
872
873         *cellp = p + s;
874         return of_read_number(p, s);
875 }
876
877 #ifdef CONFIG_PPC_PSERIES
878 /*
879  * Interpret the ibm,dynamic-memory property in the
880  * /ibm,dynamic-reconfiguration-memory node.
881  * This contains a list of memory blocks along with NUMA affinity
882  * information.
883  */
884 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
885 {
886         cell_t *dm, *ls;
887         unsigned long l, n, flags;
888         u64 base, size, lmb_size;
889
890         ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
891         if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
892                 return 0;
893         lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
894
895         dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
896         if (dm == NULL || l < sizeof(cell_t))
897                 return 0;
898
899         n = *dm++;      /* number of entries */
900         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
901                 return 0;
902
903         for (; n != 0; --n) {
904                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
905                 flags = dm[3];
906                 /* skip DRC index, pad, assoc. list index, flags */
907                 dm += 4;
908                 /* skip this block if the reserved bit is set in flags (0x80)
909                    or if the block is not assigned to this partition (0x8) */
910                 if ((flags & 0x80) || !(flags & 0x8))
911                         continue;
912                 size = lmb_size;
913                 if (iommu_is_off) {
914                         if (base >= 0x80000000ul)
915                                 continue;
916                         if ((base + size) > 0x80000000ul)
917                                 size = 0x80000000ul - base;
918                 }
919                 lmb_add(base, size);
920         }
921         lmb_dump_all();
922         return 0;
923 }
924 #else
925 #define early_init_dt_scan_drconf_memory(node)  0
926 #endif /* CONFIG_PPC_PSERIES */
927
928 static int __init early_init_dt_scan_memory(unsigned long node,
929                                             const char *uname, int depth, void *data)
930 {
931         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
932         cell_t *reg, *endp;
933         unsigned long l;
934
935         /* Look for the ibm,dynamic-reconfiguration-memory node */
936         if (depth == 1 &&
937             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
938                 return early_init_dt_scan_drconf_memory(node);
939
940         /* We are scanning "memory" nodes only */
941         if (type == NULL) {
942                 /*
943                  * The longtrail doesn't have a device_type on the
944                  * /memory node, so look for the node called /memory@0.
945                  */
946                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
947                         return 0;
948         } else if (strcmp(type, "memory") != 0)
949                 return 0;
950
951         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
952         if (reg == NULL)
953                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
954         if (reg == NULL)
955                 return 0;
956
957         endp = reg + (l / sizeof(cell_t));
958
959         DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
960             uname, l, reg[0], reg[1], reg[2], reg[3]);
961
962         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
963                 u64 base, size;
964
965                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
966                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
967
968                 if (size == 0)
969                         continue;
970                 DBG(" - %llx ,  %llx\n", (unsigned long long)base,
971                     (unsigned long long)size);
972 #ifdef CONFIG_PPC64
973                 if (iommu_is_off) {
974                         if (base >= 0x80000000ul)
975                                 continue;
976                         if ((base + size) > 0x80000000ul)
977                                 size = 0x80000000ul - base;
978                 }
979 #endif
980                 lmb_add(base, size);
981         }
982         return 0;
983 }
984
985 static void __init early_reserve_mem(void)
986 {
987         u64 base, size;
988         u64 *reserve_map;
989         unsigned long self_base;
990         unsigned long self_size;
991
992         reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
993                                         initial_boot_params->off_mem_rsvmap);
994
995         /* before we do anything, lets reserve the dt blob */
996         self_base = __pa((unsigned long)initial_boot_params);
997         self_size = initial_boot_params->totalsize;
998         lmb_reserve(self_base, self_size);
999
1000 #ifdef CONFIG_BLK_DEV_INITRD
1001         /* then reserve the initrd, if any */
1002         if (initrd_start && (initrd_end > initrd_start))
1003                 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
1004 #endif /* CONFIG_BLK_DEV_INITRD */
1005
1006 #ifdef CONFIG_PPC32
1007         /* 
1008          * Handle the case where we might be booting from an old kexec
1009          * image that setup the mem_rsvmap as pairs of 32-bit values
1010          */
1011         if (*reserve_map > 0xffffffffull) {
1012                 u32 base_32, size_32;
1013                 u32 *reserve_map_32 = (u32 *)reserve_map;
1014
1015                 while (1) {
1016                         base_32 = *(reserve_map_32++);
1017                         size_32 = *(reserve_map_32++);
1018                         if (size_32 == 0)
1019                                 break;
1020                         /* skip if the reservation is for the blob */
1021                         if (base_32 == self_base && size_32 == self_size)
1022                                 continue;
1023                         DBG("reserving: %x -> %x\n", base_32, size_32);
1024                         lmb_reserve(base_32, size_32);
1025                 }
1026                 return;
1027         }
1028 #endif
1029         while (1) {
1030                 base = *(reserve_map++);
1031                 size = *(reserve_map++);
1032                 if (size == 0)
1033                         break;
1034                 DBG("reserving: %llx -> %llx\n", base, size);
1035                 lmb_reserve(base, size);
1036         }
1037
1038 #if 0
1039         DBG("memory reserved, lmbs :\n");
1040         lmb_dump_all();
1041 #endif
1042 }
1043
1044 #ifdef CONFIG_PHYP_DUMP
1045 /**
1046  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
1047  *
1048  * Function to find the largest size we need to reserve
1049  * during early boot process.
1050  *
1051  * It either looks for boot param and returns that OR
1052  * returns larger of 256 or 5% rounded down to multiples of 256MB.
1053  *
1054  */
1055 static inline unsigned long phyp_dump_calculate_reserve_size(void)
1056 {
1057         unsigned long tmp;
1058
1059         if (phyp_dump_info->reserve_bootvar)
1060                 return phyp_dump_info->reserve_bootvar;
1061
1062         /* divide by 20 to get 5% of value */
1063         tmp = lmb_end_of_DRAM();
1064         do_div(tmp, 20);
1065
1066         /* round it down in multiples of 256 */
1067         tmp = tmp & ~0x0FFFFFFFUL;
1068
1069         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
1070 }
1071
1072 /**
1073  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
1074  *
1075  * This routine may reserve memory regions in the kernel only
1076  * if the system is supported and a dump was taken in last
1077  * boot instance or if the hardware is supported and the
1078  * scratch area needs to be setup. In other instances it returns
1079  * without reserving anything. The memory in case of dump being
1080  * active is freed when the dump is collected (by userland tools).
1081  */
1082 static void __init phyp_dump_reserve_mem(void)
1083 {
1084         unsigned long base, size;
1085         unsigned long variable_reserve_size;
1086
1087         if (!phyp_dump_info->phyp_dump_configured) {
1088                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
1089                 return;
1090         }
1091
1092         if (!phyp_dump_info->phyp_dump_at_boot) {
1093                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
1094                 return;
1095         }
1096
1097         variable_reserve_size = phyp_dump_calculate_reserve_size();
1098
1099         if (phyp_dump_info->phyp_dump_is_active) {
1100                 /* Reserve *everything* above RMR.Area freed by userland tools*/
1101                 base = variable_reserve_size;
1102                 size = lmb_end_of_DRAM() - base;
1103
1104                 /* XXX crashed_ram_end is wrong, since it may be beyond
1105                  * the memory_limit, it will need to be adjusted. */
1106                 lmb_reserve(base, size);
1107
1108                 phyp_dump_info->init_reserve_start = base;
1109                 phyp_dump_info->init_reserve_size = size;
1110         } else {
1111                 size = phyp_dump_info->cpu_state_size +
1112                         phyp_dump_info->hpte_region_size +
1113                         variable_reserve_size;
1114                 base = lmb_end_of_DRAM() - size;
1115                 lmb_reserve(base, size);
1116                 phyp_dump_info->init_reserve_start = base;
1117                 phyp_dump_info->init_reserve_size = size;
1118         }
1119 }
1120 #else
1121 static inline void __init phyp_dump_reserve_mem(void) {}
1122 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
1123
1124
1125 void __init early_init_devtree(void *params)
1126 {
1127         DBG(" -> early_init_devtree(%p)\n", params);
1128
1129         /* Setup flat device-tree pointer */
1130         initial_boot_params = params;
1131
1132 #ifdef CONFIG_PPC_RTAS
1133         /* Some machines might need RTAS info for debugging, grab it now. */
1134         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1135 #endif
1136
1137 #ifdef CONFIG_PHYP_DUMP
1138         /* scan tree to see if dump occured during last boot */
1139         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
1140 #endif
1141
1142         /* Retrieve various informations from the /chosen node of the
1143          * device-tree, including the platform type, initrd location and
1144          * size, TCE reserve, and more ...
1145          */
1146         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1147
1148         /* Scan memory nodes and rebuild LMBs */
1149         lmb_init();
1150         of_scan_flat_dt(early_init_dt_scan_root, NULL);
1151         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1152
1153         /* Save command line for /proc/cmdline and then parse parameters */
1154         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1155         parse_early_param();
1156
1157         /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1158         lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1159         reserve_kdump_trampoline();
1160         reserve_crashkernel();
1161         early_reserve_mem();
1162         phyp_dump_reserve_mem();
1163
1164         lmb_enforce_memory_limit(memory_limit);
1165         lmb_analyze();
1166
1167         DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1168
1169         /* We may need to relocate the flat tree, do it now.
1170          * FIXME .. and the initrd too? */
1171         move_device_tree();
1172
1173         DBG("Scanning CPUs ...\n");
1174
1175         /* Retreive CPU related informations from the flat tree
1176          * (altivec support, boot CPU ID, ...)
1177          */
1178         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1179
1180         DBG(" <- early_init_devtree()\n");
1181 }
1182
1183
1184 /**
1185  * Indicates whether the root node has a given value in its
1186  * compatible property.
1187  */
1188 int machine_is_compatible(const char *compat)
1189 {
1190         struct device_node *root;
1191         int rc = 0;
1192
1193         root = of_find_node_by_path("/");
1194         if (root) {
1195                 rc = of_device_is_compatible(root, compat);
1196                 of_node_put(root);
1197         }
1198         return rc;
1199 }
1200 EXPORT_SYMBOL(machine_is_compatible);
1201
1202 /*******
1203  *
1204  * New implementation of the OF "find" APIs, return a refcounted
1205  * object, call of_node_put() when done.  The device tree and list
1206  * are protected by a rw_lock.
1207  *
1208  * Note that property management will need some locking as well,
1209  * this isn't dealt with yet.
1210  *
1211  *******/
1212
1213 /**
1214  *      of_find_node_by_phandle - Find a node given a phandle
1215  *      @handle:        phandle of the node to find
1216  *
1217  *      Returns a node pointer with refcount incremented, use
1218  *      of_node_put() on it when done.
1219  */
1220 struct device_node *of_find_node_by_phandle(phandle handle)
1221 {
1222         struct device_node *np;
1223
1224         read_lock(&devtree_lock);
1225         for (np = allnodes; np != 0; np = np->allnext)
1226                 if (np->linux_phandle == handle)
1227                         break;
1228         of_node_get(np);
1229         read_unlock(&devtree_lock);
1230         return np;
1231 }
1232 EXPORT_SYMBOL(of_find_node_by_phandle);
1233
1234 /**
1235  *      of_find_all_nodes - Get next node in global list
1236  *      @prev:  Previous node or NULL to start iteration
1237  *              of_node_put() will be called on it
1238  *
1239  *      Returns a node pointer with refcount incremented, use
1240  *      of_node_put() on it when done.
1241  */
1242 struct device_node *of_find_all_nodes(struct device_node *prev)
1243 {
1244         struct device_node *np;
1245
1246         read_lock(&devtree_lock);
1247         np = prev ? prev->allnext : allnodes;
1248         for (; np != 0; np = np->allnext)
1249                 if (of_node_get(np))
1250                         break;
1251         of_node_put(prev);
1252         read_unlock(&devtree_lock);
1253         return np;
1254 }
1255 EXPORT_SYMBOL(of_find_all_nodes);
1256
1257 /**
1258  *      of_node_get - Increment refcount of a node
1259  *      @node:  Node to inc refcount, NULL is supported to
1260  *              simplify writing of callers
1261  *
1262  *      Returns node.
1263  */
1264 struct device_node *of_node_get(struct device_node *node)
1265 {
1266         if (node)
1267                 kref_get(&node->kref);
1268         return node;
1269 }
1270 EXPORT_SYMBOL(of_node_get);
1271
1272 static inline struct device_node * kref_to_device_node(struct kref *kref)
1273 {
1274         return container_of(kref, struct device_node, kref);
1275 }
1276
1277 /**
1278  *      of_node_release - release a dynamically allocated node
1279  *      @kref:  kref element of the node to be released
1280  *
1281  *      In of_node_put() this function is passed to kref_put()
1282  *      as the destructor.
1283  */
1284 static void of_node_release(struct kref *kref)
1285 {
1286         struct device_node *node = kref_to_device_node(kref);
1287         struct property *prop = node->properties;
1288
1289         /* We should never be releasing nodes that haven't been detached. */
1290         if (!of_node_check_flag(node, OF_DETACHED)) {
1291                 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1292                 dump_stack();
1293                 kref_init(&node->kref);
1294                 return;
1295         }
1296
1297         if (!of_node_check_flag(node, OF_DYNAMIC))
1298                 return;
1299
1300         while (prop) {
1301                 struct property *next = prop->next;
1302                 kfree(prop->name);
1303                 kfree(prop->value);
1304                 kfree(prop);
1305                 prop = next;
1306
1307                 if (!prop) {
1308                         prop = node->deadprops;
1309                         node->deadprops = NULL;
1310                 }
1311         }
1312         kfree(node->full_name);
1313         kfree(node->data);
1314         kfree(node);
1315 }
1316
1317 /**
1318  *      of_node_put - Decrement refcount of a node
1319  *      @node:  Node to dec refcount, NULL is supported to
1320  *              simplify writing of callers
1321  *
1322  */
1323 void of_node_put(struct device_node *node)
1324 {
1325         if (node)
1326                 kref_put(&node->kref, of_node_release);
1327 }
1328 EXPORT_SYMBOL(of_node_put);
1329
1330 /*
1331  * Plug a device node into the tree and global list.
1332  */
1333 void of_attach_node(struct device_node *np)
1334 {
1335         write_lock(&devtree_lock);
1336         np->sibling = np->parent->child;
1337         np->allnext = allnodes;
1338         np->parent->child = np;
1339         allnodes = np;
1340         write_unlock(&devtree_lock);
1341 }
1342
1343 /*
1344  * "Unplug" a node from the device tree.  The caller must hold
1345  * a reference to the node.  The memory associated with the node
1346  * is not freed until its refcount goes to zero.
1347  */
1348 void of_detach_node(struct device_node *np)
1349 {
1350         struct device_node *parent;
1351
1352         write_lock(&devtree_lock);
1353
1354         parent = np->parent;
1355         if (!parent)
1356                 goto out_unlock;
1357
1358         if (allnodes == np)
1359                 allnodes = np->allnext;
1360         else {
1361                 struct device_node *prev;
1362                 for (prev = allnodes;
1363                      prev->allnext != np;
1364                      prev = prev->allnext)
1365                         ;
1366                 prev->allnext = np->allnext;
1367         }
1368
1369         if (parent->child == np)
1370                 parent->child = np->sibling;
1371         else {
1372                 struct device_node *prevsib;
1373                 for (prevsib = np->parent->child;
1374                      prevsib->sibling != np;
1375                      prevsib = prevsib->sibling)
1376                         ;
1377                 prevsib->sibling = np->sibling;
1378         }
1379
1380         of_node_set_flag(np, OF_DETACHED);
1381
1382 out_unlock:
1383         write_unlock(&devtree_lock);
1384 }
1385
1386 #ifdef CONFIG_PPC_PSERIES
1387 /*
1388  * Fix up the uninitialized fields in a new device node:
1389  * name, type and pci-specific fields
1390  */
1391
1392 static int of_finish_dynamic_node(struct device_node *node)
1393 {
1394         struct device_node *parent = of_get_parent(node);
1395         int err = 0;
1396         const phandle *ibm_phandle;
1397
1398         node->name = of_get_property(node, "name", NULL);
1399         node->type = of_get_property(node, "device_type", NULL);
1400
1401         if (!node->name)
1402                 node->name = "<NULL>";
1403         if (!node->type)
1404                 node->type = "<NULL>";
1405
1406         if (!parent) {
1407                 err = -ENODEV;
1408                 goto out;
1409         }
1410
1411         /* We don't support that function on PowerMac, at least
1412          * not yet
1413          */
1414         if (machine_is(powermac))
1415                 return -ENODEV;
1416
1417         /* fix up new node's linux_phandle field */
1418         if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1419                 node->linux_phandle = *ibm_phandle;
1420
1421 out:
1422         of_node_put(parent);
1423         return err;
1424 }
1425
1426 static int prom_reconfig_notifier(struct notifier_block *nb,
1427                                   unsigned long action, void *node)
1428 {
1429         int err;
1430
1431         switch (action) {
1432         case PSERIES_RECONFIG_ADD:
1433                 err = of_finish_dynamic_node(node);
1434                 if (err < 0) {
1435                         printk(KERN_ERR "finish_node returned %d\n", err);
1436                         err = NOTIFY_BAD;
1437                 }
1438                 break;
1439         default:
1440                 err = NOTIFY_DONE;
1441                 break;
1442         }
1443         return err;
1444 }
1445
1446 static struct notifier_block prom_reconfig_nb = {
1447         .notifier_call = prom_reconfig_notifier,
1448         .priority = 10, /* This one needs to run first */
1449 };
1450
1451 static int __init prom_reconfig_setup(void)
1452 {
1453         return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1454 }
1455 __initcall(prom_reconfig_setup);
1456 #endif
1457
1458 /*
1459  * Add a property to a node
1460  */
1461 int prom_add_property(struct device_node* np, struct property* prop)
1462 {
1463         struct property **next;
1464
1465         prop->next = NULL;      
1466         write_lock(&devtree_lock);
1467         next = &np->properties;
1468         while (*next) {
1469                 if (strcmp(prop->name, (*next)->name) == 0) {
1470                         /* duplicate ! don't insert it */
1471                         write_unlock(&devtree_lock);
1472                         return -1;
1473                 }
1474                 next = &(*next)->next;
1475         }
1476         *next = prop;
1477         write_unlock(&devtree_lock);
1478
1479 #ifdef CONFIG_PROC_DEVICETREE
1480         /* try to add to proc as well if it was initialized */
1481         if (np->pde)
1482                 proc_device_tree_add_prop(np->pde, prop);
1483 #endif /* CONFIG_PROC_DEVICETREE */
1484
1485         return 0;
1486 }
1487
1488 /*
1489  * Remove a property from a node.  Note that we don't actually
1490  * remove it, since we have given out who-knows-how-many pointers
1491  * to the data using get-property.  Instead we just move the property
1492  * to the "dead properties" list, so it won't be found any more.
1493  */
1494 int prom_remove_property(struct device_node *np, struct property *prop)
1495 {
1496         struct property **next;
1497         int found = 0;
1498
1499         write_lock(&devtree_lock);
1500         next = &np->properties;
1501         while (*next) {
1502                 if (*next == prop) {
1503                         /* found the node */
1504                         *next = prop->next;
1505                         prop->next = np->deadprops;
1506                         np->deadprops = prop;
1507                         found = 1;
1508                         break;
1509                 }
1510                 next = &(*next)->next;
1511         }
1512         write_unlock(&devtree_lock);
1513
1514         if (!found)
1515                 return -ENODEV;
1516
1517 #ifdef CONFIG_PROC_DEVICETREE
1518         /* try to remove the proc node as well */
1519         if (np->pde)
1520                 proc_device_tree_remove_prop(np->pde, prop);
1521 #endif /* CONFIG_PROC_DEVICETREE */
1522
1523         return 0;
1524 }
1525
1526 /*
1527  * Update a property in a node.  Note that we don't actually
1528  * remove it, since we have given out who-knows-how-many pointers
1529  * to the data using get-property.  Instead we just move the property
1530  * to the "dead properties" list, and add the new property to the
1531  * property list
1532  */
1533 int prom_update_property(struct device_node *np,
1534                          struct property *newprop,
1535                          struct property *oldprop)
1536 {
1537         struct property **next;
1538         int found = 0;
1539
1540         write_lock(&devtree_lock);
1541         next = &np->properties;
1542         while (*next) {
1543                 if (*next == oldprop) {
1544                         /* found the node */
1545                         newprop->next = oldprop->next;
1546                         *next = newprop;
1547                         oldprop->next = np->deadprops;
1548                         np->deadprops = oldprop;
1549                         found = 1;
1550                         break;
1551                 }
1552                 next = &(*next)->next;
1553         }
1554         write_unlock(&devtree_lock);
1555
1556         if (!found)
1557                 return -ENODEV;
1558
1559 #ifdef CONFIG_PROC_DEVICETREE
1560         /* try to add to proc as well if it was initialized */
1561         if (np->pde)
1562                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1563 #endif /* CONFIG_PROC_DEVICETREE */
1564
1565         return 0;
1566 }
1567
1568
1569 /* Find the device node for a given logical cpu number, also returns the cpu
1570  * local thread number (index in ibm,interrupt-server#s) if relevant and
1571  * asked for (non NULL)
1572  */
1573 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1574 {
1575         int hardid;
1576         struct device_node *np;
1577
1578         hardid = get_hard_smp_processor_id(cpu);
1579
1580         for_each_node_by_type(np, "cpu") {
1581                 const u32 *intserv;
1582                 unsigned int plen, t;
1583
1584                 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1585                  * fallback to "reg" property and assume no threads
1586                  */
1587                 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1588                                 &plen);
1589                 if (intserv == NULL) {
1590                         const u32 *reg = of_get_property(np, "reg", NULL);
1591                         if (reg == NULL)
1592                                 continue;
1593                         if (*reg == hardid) {
1594                                 if (thread)
1595                                         *thread = 0;
1596                                 return np;
1597                         }
1598                 } else {
1599                         plen /= sizeof(u32);
1600                         for (t = 0; t < plen; t++) {
1601                                 if (hardid == intserv[t]) {
1602                                         if (thread)
1603                                                 *thread = t;
1604                                         return np;
1605                                 }
1606                         }
1607                 }
1608         }
1609         return NULL;
1610 }
1611 EXPORT_SYMBOL(of_get_cpu_node);
1612
1613 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1614 static struct debugfs_blob_wrapper flat_dt_blob;
1615
1616 static int __init export_flat_device_tree(void)
1617 {
1618         struct dentry *d;
1619
1620         flat_dt_blob.data = initial_boot_params;
1621         flat_dt_blob.size = initial_boot_params->totalsize;
1622
1623         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1624                                 powerpc_debugfs_root, &flat_dt_blob);
1625         if (!d)
1626                 return 1;
1627
1628         return 0;
1629 }
1630 __initcall(export_flat_device_tree);
1631 #endif