powerpc: Make the 64-bit kernel as a position-independent executable
[linux-2.6.git] / arch / powerpc / kernel / prom.c
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 #include <mm/mmu_decl.h>
57
58 #ifdef DEBUG
59 #define DBG(fmt...) printk(KERN_ERR fmt)
60 #else
61 #define DBG(fmt...)
62 #endif
63
64
65 static int __initdata dt_root_addr_cells;
66 static int __initdata dt_root_size_cells;
67
68 #ifdef CONFIG_PPC64
69 int __initdata iommu_is_off;
70 int __initdata iommu_force_on;
71 unsigned long tce_alloc_start, tce_alloc_end;
72 #endif
73
74 typedef u32 cell_t;
75
76 #if 0
77 static struct boot_param_header *initial_boot_params __initdata;
78 #else
79 struct boot_param_header *initial_boot_params;
80 #endif
81
82 extern struct device_node *allnodes;    /* temporary while merging */
83
84 extern rwlock_t devtree_lock;   /* temporary while merging */
85
86 /* export that to outside world */
87 struct device_node *of_chosen;
88
89 static inline char *find_flat_dt_string(u32 offset)
90 {
91         return ((char *)initial_boot_params) +
92                 initial_boot_params->off_dt_strings + offset;
93 }
94
95 /**
96  * This function is used to scan the flattened device-tree, it is
97  * used to extract the memory informations at boot before we can
98  * unflatten the tree
99  */
100 int __init of_scan_flat_dt(int (*it)(unsigned long node,
101                                      const char *uname, int depth,
102                                      void *data),
103                            void *data)
104 {
105         unsigned long p = ((unsigned long)initial_boot_params) +
106                 initial_boot_params->off_dt_struct;
107         int rc = 0;
108         int depth = -1;
109
110         do {
111                 u32 tag = *((u32 *)p);
112                 char *pathp;
113                 
114                 p += 4;
115                 if (tag == OF_DT_END_NODE) {
116                         depth --;
117                         continue;
118                 }
119                 if (tag == OF_DT_NOP)
120                         continue;
121                 if (tag == OF_DT_END)
122                         break;
123                 if (tag == OF_DT_PROP) {
124                         u32 sz = *((u32 *)p);
125                         p += 8;
126                         if (initial_boot_params->version < 0x10)
127                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
128                         p += sz;
129                         p = _ALIGN(p, 4);
130                         continue;
131                 }
132                 if (tag != OF_DT_BEGIN_NODE) {
133                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
134                                " device tree !\n", tag);
135                         return -EINVAL;
136                 }
137                 depth++;
138                 pathp = (char *)p;
139                 p = _ALIGN(p + strlen(pathp) + 1, 4);
140                 if ((*pathp) == '/') {
141                         char *lp, *np;
142                         for (lp = NULL, np = pathp; *np; np++)
143                                 if ((*np) == '/')
144                                         lp = np+1;
145                         if (lp != NULL)
146                                 pathp = lp;
147                 }
148                 rc = it(p, pathp, depth, data);
149                 if (rc != 0)
150                         break;          
151         } while(1);
152
153         return rc;
154 }
155
156 unsigned long __init of_get_flat_dt_root(void)
157 {
158         unsigned long p = ((unsigned long)initial_boot_params) +
159                 initial_boot_params->off_dt_struct;
160
161         while(*((u32 *)p) == OF_DT_NOP)
162                 p += 4;
163         BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
164         p += 4;
165         return _ALIGN(p + strlen((char *)p) + 1, 4);
166 }
167
168 /**
169  * This  function can be used within scan_flattened_dt callback to get
170  * access to properties
171  */
172 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
173                                  unsigned long *size)
174 {
175         unsigned long p = node;
176
177         do {
178                 u32 tag = *((u32 *)p);
179                 u32 sz, noff;
180                 const char *nstr;
181
182                 p += 4;
183                 if (tag == OF_DT_NOP)
184                         continue;
185                 if (tag != OF_DT_PROP)
186                         return NULL;
187
188                 sz = *((u32 *)p);
189                 noff = *((u32 *)(p + 4));
190                 p += 8;
191                 if (initial_boot_params->version < 0x10)
192                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
193
194                 nstr = find_flat_dt_string(noff);
195                 if (nstr == NULL) {
196                         printk(KERN_WARNING "Can't find property index"
197                                " name !\n");
198                         return NULL;
199                 }
200                 if (strcmp(name, nstr) == 0) {
201                         if (size)
202                                 *size = sz;
203                         return (void *)p;
204                 }
205                 p += sz;
206                 p = _ALIGN(p, 4);
207         } while(1);
208 }
209
210 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
211 {
212         const char* cp;
213         unsigned long cplen, l;
214
215         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
216         if (cp == NULL)
217                 return 0;
218         while (cplen > 0) {
219                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
220                         return 1;
221                 l = strlen(cp) + 1;
222                 cp += l;
223                 cplen -= l;
224         }
225
226         return 0;
227 }
228
229 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
230                                        unsigned long align)
231 {
232         void *res;
233
234         *mem = _ALIGN(*mem, align);
235         res = (void *)*mem;
236         *mem += size;
237
238         return res;
239 }
240
241 static unsigned long __init unflatten_dt_node(unsigned long mem,
242                                               unsigned long *p,
243                                               struct device_node *dad,
244                                               struct device_node ***allnextpp,
245                                               unsigned long fpsize)
246 {
247         struct device_node *np;
248         struct property *pp, **prev_pp = NULL;
249         char *pathp;
250         u32 tag;
251         unsigned int l, allocl;
252         int has_name = 0;
253         int new_format = 0;
254
255         tag = *((u32 *)(*p));
256         if (tag != OF_DT_BEGIN_NODE) {
257                 printk("Weird tag at start of node: %x\n", tag);
258                 return mem;
259         }
260         *p += 4;
261         pathp = (char *)*p;
262         l = allocl = strlen(pathp) + 1;
263         *p = _ALIGN(*p + l, 4);
264
265         /* version 0x10 has a more compact unit name here instead of the full
266          * path. we accumulate the full path size using "fpsize", we'll rebuild
267          * it later. We detect this because the first character of the name is
268          * not '/'.
269          */
270         if ((*pathp) != '/') {
271                 new_format = 1;
272                 if (fpsize == 0) {
273                         /* root node: special case. fpsize accounts for path
274                          * plus terminating zero. root node only has '/', so
275                          * fpsize should be 2, but we want to avoid the first
276                          * level nodes to have two '/' so we use fpsize 1 here
277                          */
278                         fpsize = 1;
279                         allocl = 2;
280                 } else {
281                         /* account for '/' and path size minus terminal 0
282                          * already in 'l'
283                          */
284                         fpsize += l;
285                         allocl = fpsize;
286                 }
287         }
288
289
290         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
291                                 __alignof__(struct device_node));
292         if (allnextpp) {
293                 memset(np, 0, sizeof(*np));
294                 np->full_name = ((char*)np) + sizeof(struct device_node);
295                 if (new_format) {
296                         char *p = np->full_name;
297                         /* rebuild full path for new format */
298                         if (dad && dad->parent) {
299                                 strcpy(p, dad->full_name);
300 #ifdef DEBUG
301                                 if ((strlen(p) + l + 1) != allocl) {
302                                         DBG("%s: p: %d, l: %d, a: %d\n",
303                                             pathp, (int)strlen(p), l, allocl);
304                                 }
305 #endif
306                                 p += strlen(p);
307                         }
308                         *(p++) = '/';
309                         memcpy(p, pathp, l);
310                 } else
311                         memcpy(np->full_name, pathp, l);
312                 prev_pp = &np->properties;
313                 **allnextpp = np;
314                 *allnextpp = &np->allnext;
315                 if (dad != NULL) {
316                         np->parent = dad;
317                         /* we temporarily use the next field as `last_child'*/
318                         if (dad->next == 0)
319                                 dad->child = np;
320                         else
321                                 dad->next->sibling = np;
322                         dad->next = np;
323                 }
324                 kref_init(&np->kref);
325         }
326         while(1) {
327                 u32 sz, noff;
328                 char *pname;
329
330                 tag = *((u32 *)(*p));
331                 if (tag == OF_DT_NOP) {
332                         *p += 4;
333                         continue;
334                 }
335                 if (tag != OF_DT_PROP)
336                         break;
337                 *p += 4;
338                 sz = *((u32 *)(*p));
339                 noff = *((u32 *)((*p) + 4));
340                 *p += 8;
341                 if (initial_boot_params->version < 0x10)
342                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
343
344                 pname = find_flat_dt_string(noff);
345                 if (pname == NULL) {
346                         printk("Can't find property name in list !\n");
347                         break;
348                 }
349                 if (strcmp(pname, "name") == 0)
350                         has_name = 1;
351                 l = strlen(pname) + 1;
352                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
353                                         __alignof__(struct property));
354                 if (allnextpp) {
355                         if (strcmp(pname, "linux,phandle") == 0) {
356                                 np->node = *((u32 *)*p);
357                                 if (np->linux_phandle == 0)
358                                         np->linux_phandle = np->node;
359                         }
360                         if (strcmp(pname, "ibm,phandle") == 0)
361                                 np->linux_phandle = *((u32 *)*p);
362                         pp->name = pname;
363                         pp->length = sz;
364                         pp->value = (void *)*p;
365                         *prev_pp = pp;
366                         prev_pp = &pp->next;
367                 }
368                 *p = _ALIGN((*p) + sz, 4);
369         }
370         /* with version 0x10 we may not have the name property, recreate
371          * it here from the unit name if absent
372          */
373         if (!has_name) {
374                 char *p = pathp, *ps = pathp, *pa = NULL;
375                 int sz;
376
377                 while (*p) {
378                         if ((*p) == '@')
379                                 pa = p;
380                         if ((*p) == '/')
381                                 ps = p + 1;
382                         p++;
383                 }
384                 if (pa < ps)
385                         pa = p;
386                 sz = (pa - ps) + 1;
387                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
388                                         __alignof__(struct property));
389                 if (allnextpp) {
390                         pp->name = "name";
391                         pp->length = sz;
392                         pp->value = pp + 1;
393                         *prev_pp = pp;
394                         prev_pp = &pp->next;
395                         memcpy(pp->value, ps, sz - 1);
396                         ((char *)pp->value)[sz - 1] = 0;
397                         DBG("fixed up name for %s -> %s\n", pathp,
398                                 (char *)pp->value);
399                 }
400         }
401         if (allnextpp) {
402                 *prev_pp = NULL;
403                 np->name = of_get_property(np, "name", NULL);
404                 np->type = of_get_property(np, "device_type", NULL);
405
406                 if (!np->name)
407                         np->name = "<NULL>";
408                 if (!np->type)
409                         np->type = "<NULL>";
410         }
411         while (tag == OF_DT_BEGIN_NODE) {
412                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
413                 tag = *((u32 *)(*p));
414         }
415         if (tag != OF_DT_END_NODE) {
416                 printk("Weird tag at end of node: %x\n", tag);
417                 return mem;
418         }
419         *p += 4;
420         return mem;
421 }
422
423 static int __init early_parse_mem(char *p)
424 {
425         if (!p)
426                 return 1;
427
428         memory_limit = PAGE_ALIGN(memparse(p, &p));
429         DBG("memory limit = 0x%lx\n", memory_limit);
430
431         return 0;
432 }
433 early_param("mem", early_parse_mem);
434
435 /**
436  * move_device_tree - move tree to an unused area, if needed.
437  *
438  * The device tree may be allocated beyond our memory limit, or inside the
439  * crash kernel region for kdump. If so, move it out of the way.
440  */
441 static void __init move_device_tree(void)
442 {
443         unsigned long start, size;
444         void *p;
445
446         DBG("-> move_device_tree\n");
447
448         start = __pa(initial_boot_params);
449         size = initial_boot_params->totalsize;
450
451         if ((memory_limit && (start + size) > memory_limit) ||
452                         overlaps_crashkernel(start, size)) {
453                 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
454                 memcpy(p, initial_boot_params, size);
455                 initial_boot_params = (struct boot_param_header *)p;
456                 DBG("Moved device tree to 0x%p\n", p);
457         }
458
459         DBG("<- move_device_tree\n");
460 }
461
462 /**
463  * unflattens the device-tree passed by the firmware, creating the
464  * tree of struct device_node. It also fills the "name" and "type"
465  * pointers of the nodes so the normal device-tree walking functions
466  * can be used (this used to be done by finish_device_tree)
467  */
468 void __init unflatten_device_tree(void)
469 {
470         unsigned long start, mem, size;
471         struct device_node **allnextp = &allnodes;
472
473         DBG(" -> unflatten_device_tree()\n");
474
475         /* First pass, scan for size */
476         start = ((unsigned long)initial_boot_params) +
477                 initial_boot_params->off_dt_struct;
478         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
479         size = (size | 3) + 1;
480
481         DBG("  size is %lx, allocating...\n", size);
482
483         /* Allocate memory for the expanded device tree */
484         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
485         mem = (unsigned long) __va(mem);
486
487         ((u32 *)mem)[size / 4] = 0xdeadbeef;
488
489         DBG("  unflattening %lx...\n", mem);
490
491         /* Second pass, do actual unflattening */
492         start = ((unsigned long)initial_boot_params) +
493                 initial_boot_params->off_dt_struct;
494         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
495         if (*((u32 *)start) != OF_DT_END)
496                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
497         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
498                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
499                        ((u32 *)mem)[size / 4] );
500         *allnextp = NULL;
501
502         /* Get pointer to OF "/chosen" node for use everywhere */
503         of_chosen = of_find_node_by_path("/chosen");
504         if (of_chosen == NULL)
505                 of_chosen = of_find_node_by_path("/chosen@0");
506
507         DBG(" <- unflatten_device_tree()\n");
508 }
509
510 /*
511  * ibm,pa-features is a per-cpu property that contains a string of
512  * attribute descriptors, each of which has a 2 byte header plus up
513  * to 254 bytes worth of processor attribute bits.  First header
514  * byte specifies the number of bytes following the header.
515  * Second header byte is an "attribute-specifier" type, of which
516  * zero is the only currently-defined value.
517  * Implementation:  Pass in the byte and bit offset for the feature
518  * that we are interested in.  The function will return -1 if the
519  * pa-features property is missing, or a 1/0 to indicate if the feature
520  * is supported/not supported.  Note that the bit numbers are
521  * big-endian to match the definition in PAPR.
522  */
523 static struct ibm_pa_feature {
524         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
525         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
526         unsigned char   pabyte;         /* byte number in ibm,pa-features */
527         unsigned char   pabit;          /* bit number (big-endian) */
528         unsigned char   invert;         /* if 1, pa bit set => clear feature */
529 } ibm_pa_features[] __initdata = {
530         {0, PPC_FEATURE_HAS_MMU,        0, 0, 0},
531         {0, PPC_FEATURE_HAS_FPU,        0, 1, 0},
532         {CPU_FTR_SLB, 0,                0, 2, 0},
533         {CPU_FTR_CTRL, 0,               0, 3, 0},
534         {CPU_FTR_NOEXECUTE, 0,          0, 6, 0},
535         {CPU_FTR_NODSISRALIGN, 0,       1, 1, 1},
536         {CPU_FTR_CI_LARGE_PAGE, 0,      1, 2, 0},
537         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
538 };
539
540 static void __init scan_features(unsigned long node, unsigned char *ftrs,
541                                  unsigned long tablelen,
542                                  struct ibm_pa_feature *fp,
543                                  unsigned long ft_size)
544 {
545         unsigned long i, len, bit;
546
547         /* find descriptor with type == 0 */
548         for (;;) {
549                 if (tablelen < 3)
550                         return;
551                 len = 2 + ftrs[0];
552                 if (tablelen < len)
553                         return;         /* descriptor 0 not found */
554                 if (ftrs[1] == 0)
555                         break;
556                 tablelen -= len;
557                 ftrs += len;
558         }
559
560         /* loop over bits we know about */
561         for (i = 0; i < ft_size; ++i, ++fp) {
562                 if (fp->pabyte >= ftrs[0])
563                         continue;
564                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
565                 if (bit ^ fp->invert) {
566                         cur_cpu_spec->cpu_features |= fp->cpu_features;
567                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
568                 } else {
569                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
570                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
571                 }
572         }
573 }
574
575 static void __init check_cpu_pa_features(unsigned long node)
576 {
577         unsigned char *pa_ftrs;
578         unsigned long tablelen;
579
580         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
581         if (pa_ftrs == NULL)
582                 return;
583
584         scan_features(node, pa_ftrs, tablelen,
585                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
586 }
587
588 #ifdef CONFIG_PPC64
589 static void __init check_cpu_slb_size(unsigned long node)
590 {
591         u32 *slb_size_ptr;
592
593         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
594         if (slb_size_ptr != NULL) {
595                 mmu_slb_size = *slb_size_ptr;
596         }
597 }
598 #else
599 #define check_cpu_slb_size(node) do { } while(0)
600 #endif
601
602 static struct feature_property {
603         const char *name;
604         u32 min_value;
605         unsigned long cpu_feature;
606         unsigned long cpu_user_ftr;
607 } feature_properties[] __initdata = {
608 #ifdef CONFIG_ALTIVEC
609         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
610         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
611 #endif /* CONFIG_ALTIVEC */
612 #ifdef CONFIG_VSX
613         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
614         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
615 #endif /* CONFIG_VSX */
616 #ifdef CONFIG_PPC64
617         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
618         {"ibm,purr", 1, CPU_FTR_PURR, 0},
619         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
620 #endif /* CONFIG_PPC64 */
621 };
622
623 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
624 static inline void identical_pvr_fixup(unsigned long node)
625 {
626         unsigned int pvr;
627         char *model = of_get_flat_dt_prop(node, "model", NULL);
628
629         /*
630          * Since 440GR(x)/440EP(x) processors have the same pvr,
631          * we check the node path and set bit 28 in the cur_cpu_spec
632          * pvr for EP(x) processor version. This bit is always 0 in
633          * the "real" pvr. Then we call identify_cpu again with
634          * the new logical pvr to enable FPU support.
635          */
636         if (model && strstr(model, "440EP")) {
637                 pvr = cur_cpu_spec->pvr_value | 0x8;
638                 identify_cpu(0, pvr);
639                 DBG("Using logical pvr %x for %s\n", pvr, model);
640         }
641 }
642 #else
643 #define identical_pvr_fixup(node) do { } while(0)
644 #endif
645
646 static void __init check_cpu_feature_properties(unsigned long node)
647 {
648         unsigned long i;
649         struct feature_property *fp = feature_properties;
650         const u32 *prop;
651
652         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
653                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
654                 if (prop && *prop >= fp->min_value) {
655                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
656                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
657                 }
658         }
659 }
660
661 static int __init early_init_dt_scan_cpus(unsigned long node,
662                                           const char *uname, int depth,
663                                           void *data)
664 {
665         static int logical_cpuid = 0;
666         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
667         const u32 *prop;
668         const u32 *intserv;
669         int i, nthreads;
670         unsigned long len;
671         int found = 0;
672
673         /* We are scanning "cpu" nodes only */
674         if (type == NULL || strcmp(type, "cpu") != 0)
675                 return 0;
676
677         /* Get physical cpuid */
678         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
679         if (intserv) {
680                 nthreads = len / sizeof(int);
681         } else {
682                 intserv = of_get_flat_dt_prop(node, "reg", NULL);
683                 nthreads = 1;
684         }
685
686         /*
687          * Now see if any of these threads match our boot cpu.
688          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
689          */
690         for (i = 0; i < nthreads; i++) {
691                 /*
692                  * version 2 of the kexec param format adds the phys cpuid of
693                  * booted proc.
694                  */
695                 if (initial_boot_params && initial_boot_params->version >= 2) {
696                         if (intserv[i] ==
697                                         initial_boot_params->boot_cpuid_phys) {
698                                 found = 1;
699                                 break;
700                         }
701                 } else {
702                         /*
703                          * Check if it's the boot-cpu, set it's hw index now,
704                          * unfortunately this format did not support booting
705                          * off secondary threads.
706                          */
707                         if (of_get_flat_dt_prop(node,
708                                         "linux,boot-cpu", NULL) != NULL) {
709                                 found = 1;
710                                 break;
711                         }
712                 }
713
714 #ifdef CONFIG_SMP
715                 /* logical cpu id is always 0 on UP kernels */
716                 logical_cpuid++;
717 #endif
718         }
719
720         if (found) {
721                 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
722                         intserv[i]);
723                 boot_cpuid = logical_cpuid;
724                 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
725
726                 /*
727                  * PAPR defines "logical" PVR values for cpus that
728                  * meet various levels of the architecture:
729                  * 0x0f000001   Architecture version 2.04
730                  * 0x0f000002   Architecture version 2.05
731                  * If the cpu-version property in the cpu node contains
732                  * such a value, we call identify_cpu again with the
733                  * logical PVR value in order to use the cpu feature
734                  * bits appropriate for the architecture level.
735                  *
736                  * A POWER6 partition in "POWER6 architected" mode
737                  * uses the 0x0f000002 PVR value; in POWER5+ mode
738                  * it uses 0x0f000001.
739                  */
740                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
741                 if (prop && (*prop & 0xff000000) == 0x0f000000)
742                         identify_cpu(0, *prop);
743
744                 identical_pvr_fixup(node);
745         }
746
747         check_cpu_feature_properties(node);
748         check_cpu_pa_features(node);
749         check_cpu_slb_size(node);
750
751 #ifdef CONFIG_PPC_PSERIES
752         if (nthreads > 1)
753                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
754         else
755                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
756 #endif
757
758         return 0;
759 }
760
761 #ifdef CONFIG_BLK_DEV_INITRD
762 static void __init early_init_dt_check_for_initrd(unsigned long node)
763 {
764         unsigned long l;
765         u32 *prop;
766
767         DBG("Looking for initrd properties... ");
768
769         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
770         if (prop) {
771                 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
772
773                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
774                 if (prop) {
775                         initrd_end = (unsigned long)
776                                         __va(of_read_ulong(prop, l/4));
777                         initrd_below_start_ok = 1;
778                 } else {
779                         initrd_start = 0;
780                 }
781         }
782
783         DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
784 }
785 #else
786 static inline void early_init_dt_check_for_initrd(unsigned long node)
787 {
788 }
789 #endif /* CONFIG_BLK_DEV_INITRD */
790
791 static int __init early_init_dt_scan_chosen(unsigned long node,
792                                             const char *uname, int depth, void *data)
793 {
794         unsigned long *lprop;
795         unsigned long l;
796         char *p;
797
798         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
799
800         if (depth != 1 ||
801             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
802                 return 0;
803
804 #ifdef CONFIG_PPC64
805         /* check if iommu is forced on or off */
806         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
807                 iommu_is_off = 1;
808         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
809                 iommu_force_on = 1;
810 #endif
811
812         /* mem=x on the command line is the preferred mechanism */
813         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
814         if (lprop)
815                 memory_limit = *lprop;
816
817 #ifdef CONFIG_PPC64
818         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
819         if (lprop)
820                 tce_alloc_start = *lprop;
821         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
822         if (lprop)
823                 tce_alloc_end = *lprop;
824 #endif
825
826 #ifdef CONFIG_KEXEC
827         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
828         if (lprop)
829                 crashk_res.start = *lprop;
830
831         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
832         if (lprop)
833                 crashk_res.end = crashk_res.start + *lprop - 1;
834 #endif
835
836         early_init_dt_check_for_initrd(node);
837
838         /* Retreive command line */
839         p = of_get_flat_dt_prop(node, "bootargs", &l);
840         if (p != NULL && l > 0)
841                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
842
843 #ifdef CONFIG_CMDLINE
844         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
845                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
846 #endif /* CONFIG_CMDLINE */
847
848         DBG("Command line is: %s\n", cmd_line);
849
850         /* break now */
851         return 1;
852 }
853
854 static int __init early_init_dt_scan_root(unsigned long node,
855                                           const char *uname, int depth, void *data)
856 {
857         u32 *prop;
858
859         if (depth != 0)
860                 return 0;
861
862         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
863         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
864         DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
865
866         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
867         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
868         DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
869         
870         /* break now */
871         return 1;
872 }
873
874 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
875 {
876         cell_t *p = *cellp;
877
878         *cellp = p + s;
879         return of_read_number(p, s);
880 }
881
882 #ifdef CONFIG_PPC_PSERIES
883 /*
884  * Interpret the ibm,dynamic-memory property in the
885  * /ibm,dynamic-reconfiguration-memory node.
886  * This contains a list of memory blocks along with NUMA affinity
887  * information.
888  */
889 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
890 {
891         cell_t *dm, *ls, *usm;
892         unsigned long l, n, flags;
893         u64 base, size, lmb_size;
894         unsigned int is_kexec_kdump = 0, rngs;
895
896         ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
897         if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
898                 return 0;
899         lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
900
901         dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
902         if (dm == NULL || l < sizeof(cell_t))
903                 return 0;
904
905         n = *dm++;      /* number of entries */
906         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
907                 return 0;
908
909         /* check if this is a kexec/kdump kernel. */
910         usm = (cell_t *)of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
911                                                  &l);
912         if (usm != NULL)
913                 is_kexec_kdump = 1;
914
915         for (; n != 0; --n) {
916                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
917                 flags = dm[3];
918                 /* skip DRC index, pad, assoc. list index, flags */
919                 dm += 4;
920                 /* skip this block if the reserved bit is set in flags (0x80)
921                    or if the block is not assigned to this partition (0x8) */
922                 if ((flags & 0x80) || !(flags & 0x8))
923                         continue;
924                 size = lmb_size;
925                 rngs = 1;
926                 if (is_kexec_kdump) {
927                         /*
928                          * For each lmb in ibm,dynamic-memory, a corresponding
929                          * entry in linux,drconf-usable-memory property contains
930                          * a counter 'p' followed by 'p' (base, size) duple.
931                          * Now read the counter from
932                          * linux,drconf-usable-memory property
933                          */
934                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
935                         if (!rngs) /* there are no (base, size) duple */
936                                 continue;
937                 }
938                 do {
939                         if (is_kexec_kdump) {
940                                 base = dt_mem_next_cell(dt_root_addr_cells,
941                                                          &usm);
942                                 size = dt_mem_next_cell(dt_root_size_cells,
943                                                          &usm);
944                         }
945                         if (iommu_is_off) {
946                                 if (base >= 0x80000000ul)
947                                         continue;
948                                 if ((base + size) > 0x80000000ul)
949                                         size = 0x80000000ul - base;
950                         }
951                         lmb_add(base, size);
952                 } while (--rngs);
953         }
954         lmb_dump_all();
955         return 0;
956 }
957 #else
958 #define early_init_dt_scan_drconf_memory(node)  0
959 #endif /* CONFIG_PPC_PSERIES */
960
961 static int __init early_init_dt_scan_memory(unsigned long node,
962                                             const char *uname, int depth, void *data)
963 {
964         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
965         cell_t *reg, *endp;
966         unsigned long l;
967
968         /* Look for the ibm,dynamic-reconfiguration-memory node */
969         if (depth == 1 &&
970             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
971                 return early_init_dt_scan_drconf_memory(node);
972
973         /* We are scanning "memory" nodes only */
974         if (type == NULL) {
975                 /*
976                  * The longtrail doesn't have a device_type on the
977                  * /memory node, so look for the node called /memory@0.
978                  */
979                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
980                         return 0;
981         } else if (strcmp(type, "memory") != 0)
982                 return 0;
983
984         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
985         if (reg == NULL)
986                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
987         if (reg == NULL)
988                 return 0;
989
990         endp = reg + (l / sizeof(cell_t));
991
992         DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
993             uname, l, reg[0], reg[1], reg[2], reg[3]);
994
995         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
996                 u64 base, size;
997
998                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
999                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
1000
1001                 if (size == 0)
1002                         continue;
1003                 DBG(" - %llx ,  %llx\n", (unsigned long long)base,
1004                     (unsigned long long)size);
1005 #ifdef CONFIG_PPC64
1006                 if (iommu_is_off) {
1007                         if (base >= 0x80000000ul)
1008                                 continue;
1009                         if ((base + size) > 0x80000000ul)
1010                                 size = 0x80000000ul - base;
1011                 }
1012 #endif
1013                 lmb_add(base, size);
1014
1015                 memstart_addr = min((u64)memstart_addr, base);
1016         }
1017
1018         return 0;
1019 }
1020
1021 static void __init early_reserve_mem(void)
1022 {
1023         u64 base, size;
1024         u64 *reserve_map;
1025         unsigned long self_base;
1026         unsigned long self_size;
1027
1028         reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
1029                                         initial_boot_params->off_mem_rsvmap);
1030
1031         /* before we do anything, lets reserve the dt blob */
1032         self_base = __pa((unsigned long)initial_boot_params);
1033         self_size = initial_boot_params->totalsize;
1034         lmb_reserve(self_base, self_size);
1035
1036 #ifdef CONFIG_BLK_DEV_INITRD
1037         /* then reserve the initrd, if any */
1038         if (initrd_start && (initrd_end > initrd_start))
1039                 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
1040 #endif /* CONFIG_BLK_DEV_INITRD */
1041
1042 #ifdef CONFIG_PPC32
1043         /* 
1044          * Handle the case where we might be booting from an old kexec
1045          * image that setup the mem_rsvmap as pairs of 32-bit values
1046          */
1047         if (*reserve_map > 0xffffffffull) {
1048                 u32 base_32, size_32;
1049                 u32 *reserve_map_32 = (u32 *)reserve_map;
1050
1051                 while (1) {
1052                         base_32 = *(reserve_map_32++);
1053                         size_32 = *(reserve_map_32++);
1054                         if (size_32 == 0)
1055                                 break;
1056                         /* skip if the reservation is for the blob */
1057                         if (base_32 == self_base && size_32 == self_size)
1058                                 continue;
1059                         DBG("reserving: %x -> %x\n", base_32, size_32);
1060                         lmb_reserve(base_32, size_32);
1061                 }
1062                 return;
1063         }
1064 #endif
1065         while (1) {
1066                 base = *(reserve_map++);
1067                 size = *(reserve_map++);
1068                 if (size == 0)
1069                         break;
1070                 DBG("reserving: %llx -> %llx\n", base, size);
1071                 lmb_reserve(base, size);
1072         }
1073
1074 #if 0
1075         DBG("memory reserved, lmbs :\n");
1076         lmb_dump_all();
1077 #endif
1078 }
1079
1080 #ifdef CONFIG_PHYP_DUMP
1081 /**
1082  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
1083  *
1084  * Function to find the largest size we need to reserve
1085  * during early boot process.
1086  *
1087  * It either looks for boot param and returns that OR
1088  * returns larger of 256 or 5% rounded down to multiples of 256MB.
1089  *
1090  */
1091 static inline unsigned long phyp_dump_calculate_reserve_size(void)
1092 {
1093         unsigned long tmp;
1094
1095         if (phyp_dump_info->reserve_bootvar)
1096                 return phyp_dump_info->reserve_bootvar;
1097
1098         /* divide by 20 to get 5% of value */
1099         tmp = lmb_end_of_DRAM();
1100         do_div(tmp, 20);
1101
1102         /* round it down in multiples of 256 */
1103         tmp = tmp & ~0x0FFFFFFFUL;
1104
1105         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
1106 }
1107
1108 /**
1109  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
1110  *
1111  * This routine may reserve memory regions in the kernel only
1112  * if the system is supported and a dump was taken in last
1113  * boot instance or if the hardware is supported and the
1114  * scratch area needs to be setup. In other instances it returns
1115  * without reserving anything. The memory in case of dump being
1116  * active is freed when the dump is collected (by userland tools).
1117  */
1118 static void __init phyp_dump_reserve_mem(void)
1119 {
1120         unsigned long base, size;
1121         unsigned long variable_reserve_size;
1122
1123         if (!phyp_dump_info->phyp_dump_configured) {
1124                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
1125                 return;
1126         }
1127
1128         if (!phyp_dump_info->phyp_dump_at_boot) {
1129                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
1130                 return;
1131         }
1132
1133         variable_reserve_size = phyp_dump_calculate_reserve_size();
1134
1135         if (phyp_dump_info->phyp_dump_is_active) {
1136                 /* Reserve *everything* above RMR.Area freed by userland tools*/
1137                 base = variable_reserve_size;
1138                 size = lmb_end_of_DRAM() - base;
1139
1140                 /* XXX crashed_ram_end is wrong, since it may be beyond
1141                  * the memory_limit, it will need to be adjusted. */
1142                 lmb_reserve(base, size);
1143
1144                 phyp_dump_info->init_reserve_start = base;
1145                 phyp_dump_info->init_reserve_size = size;
1146         } else {
1147                 size = phyp_dump_info->cpu_state_size +
1148                         phyp_dump_info->hpte_region_size +
1149                         variable_reserve_size;
1150                 base = lmb_end_of_DRAM() - size;
1151                 lmb_reserve(base, size);
1152                 phyp_dump_info->init_reserve_start = base;
1153                 phyp_dump_info->init_reserve_size = size;
1154         }
1155 }
1156 #else
1157 static inline void __init phyp_dump_reserve_mem(void) {}
1158 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
1159
1160
1161 void __init early_init_devtree(void *params)
1162 {
1163         DBG(" -> early_init_devtree(%p)\n", params);
1164
1165         /* Setup flat device-tree pointer */
1166         initial_boot_params = params;
1167
1168 #ifdef CONFIG_PPC_RTAS
1169         /* Some machines might need RTAS info for debugging, grab it now. */
1170         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1171 #endif
1172
1173 #ifdef CONFIG_PHYP_DUMP
1174         /* scan tree to see if dump occured during last boot */
1175         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
1176 #endif
1177
1178         /* Retrieve various informations from the /chosen node of the
1179          * device-tree, including the platform type, initrd location and
1180          * size, TCE reserve, and more ...
1181          */
1182         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1183
1184         /* Scan memory nodes and rebuild LMBs */
1185         lmb_init();
1186         of_scan_flat_dt(early_init_dt_scan_root, NULL);
1187         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1188
1189         /* Save command line for /proc/cmdline and then parse parameters */
1190         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1191         parse_early_param();
1192
1193         /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1194         lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1195         /* If relocatable, reserve first 32k for interrupt vectors etc. */
1196         if (PHYSICAL_START > MEMORY_START)
1197                 lmb_reserve(MEMORY_START, 0x8000);
1198         reserve_kdump_trampoline();
1199         reserve_crashkernel();
1200         early_reserve_mem();
1201         phyp_dump_reserve_mem();
1202
1203         lmb_enforce_memory_limit(memory_limit);
1204         lmb_analyze();
1205
1206         DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1207
1208         /* We may need to relocate the flat tree, do it now.
1209          * FIXME .. and the initrd too? */
1210         move_device_tree();
1211
1212         DBG("Scanning CPUs ...\n");
1213
1214         /* Retreive CPU related informations from the flat tree
1215          * (altivec support, boot CPU ID, ...)
1216          */
1217         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1218
1219         DBG(" <- early_init_devtree()\n");
1220 }
1221
1222
1223 /**
1224  * Indicates whether the root node has a given value in its
1225  * compatible property.
1226  */
1227 int machine_is_compatible(const char *compat)
1228 {
1229         struct device_node *root;
1230         int rc = 0;
1231
1232         root = of_find_node_by_path("/");
1233         if (root) {
1234                 rc = of_device_is_compatible(root, compat);
1235                 of_node_put(root);
1236         }
1237         return rc;
1238 }
1239 EXPORT_SYMBOL(machine_is_compatible);
1240
1241 /*******
1242  *
1243  * New implementation of the OF "find" APIs, return a refcounted
1244  * object, call of_node_put() when done.  The device tree and list
1245  * are protected by a rw_lock.
1246  *
1247  * Note that property management will need some locking as well,
1248  * this isn't dealt with yet.
1249  *
1250  *******/
1251
1252 /**
1253  *      of_find_node_by_phandle - Find a node given a phandle
1254  *      @handle:        phandle of the node to find
1255  *
1256  *      Returns a node pointer with refcount incremented, use
1257  *      of_node_put() on it when done.
1258  */
1259 struct device_node *of_find_node_by_phandle(phandle handle)
1260 {
1261         struct device_node *np;
1262
1263         read_lock(&devtree_lock);
1264         for (np = allnodes; np != 0; np = np->allnext)
1265                 if (np->linux_phandle == handle)
1266                         break;
1267         of_node_get(np);
1268         read_unlock(&devtree_lock);
1269         return np;
1270 }
1271 EXPORT_SYMBOL(of_find_node_by_phandle);
1272
1273 /**
1274  *      of_find_all_nodes - Get next node in global list
1275  *      @prev:  Previous node or NULL to start iteration
1276  *              of_node_put() will be called on it
1277  *
1278  *      Returns a node pointer with refcount incremented, use
1279  *      of_node_put() on it when done.
1280  */
1281 struct device_node *of_find_all_nodes(struct device_node *prev)
1282 {
1283         struct device_node *np;
1284
1285         read_lock(&devtree_lock);
1286         np = prev ? prev->allnext : allnodes;
1287         for (; np != 0; np = np->allnext)
1288                 if (of_node_get(np))
1289                         break;
1290         of_node_put(prev);
1291         read_unlock(&devtree_lock);
1292         return np;
1293 }
1294 EXPORT_SYMBOL(of_find_all_nodes);
1295
1296 /**
1297  *      of_node_get - Increment refcount of a node
1298  *      @node:  Node to inc refcount, NULL is supported to
1299  *              simplify writing of callers
1300  *
1301  *      Returns node.
1302  */
1303 struct device_node *of_node_get(struct device_node *node)
1304 {
1305         if (node)
1306                 kref_get(&node->kref);
1307         return node;
1308 }
1309 EXPORT_SYMBOL(of_node_get);
1310
1311 static inline struct device_node * kref_to_device_node(struct kref *kref)
1312 {
1313         return container_of(kref, struct device_node, kref);
1314 }
1315
1316 /**
1317  *      of_node_release - release a dynamically allocated node
1318  *      @kref:  kref element of the node to be released
1319  *
1320  *      In of_node_put() this function is passed to kref_put()
1321  *      as the destructor.
1322  */
1323 static void of_node_release(struct kref *kref)
1324 {
1325         struct device_node *node = kref_to_device_node(kref);
1326         struct property *prop = node->properties;
1327
1328         /* We should never be releasing nodes that haven't been detached. */
1329         if (!of_node_check_flag(node, OF_DETACHED)) {
1330                 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1331                 dump_stack();
1332                 kref_init(&node->kref);
1333                 return;
1334         }
1335
1336         if (!of_node_check_flag(node, OF_DYNAMIC))
1337                 return;
1338
1339         while (prop) {
1340                 struct property *next = prop->next;
1341                 kfree(prop->name);
1342                 kfree(prop->value);
1343                 kfree(prop);
1344                 prop = next;
1345
1346                 if (!prop) {
1347                         prop = node->deadprops;
1348                         node->deadprops = NULL;
1349                 }
1350         }
1351         kfree(node->full_name);
1352         kfree(node->data);
1353         kfree(node);
1354 }
1355
1356 /**
1357  *      of_node_put - Decrement refcount of a node
1358  *      @node:  Node to dec refcount, NULL is supported to
1359  *              simplify writing of callers
1360  *
1361  */
1362 void of_node_put(struct device_node *node)
1363 {
1364         if (node)
1365                 kref_put(&node->kref, of_node_release);
1366 }
1367 EXPORT_SYMBOL(of_node_put);
1368
1369 /*
1370  * Plug a device node into the tree and global list.
1371  */
1372 void of_attach_node(struct device_node *np)
1373 {
1374         unsigned long flags;
1375
1376         write_lock_irqsave(&devtree_lock, flags);
1377         np->sibling = np->parent->child;
1378         np->allnext = allnodes;
1379         np->parent->child = np;
1380         allnodes = np;
1381         write_unlock_irqrestore(&devtree_lock, flags);
1382 }
1383
1384 /*
1385  * "Unplug" a node from the device tree.  The caller must hold
1386  * a reference to the node.  The memory associated with the node
1387  * is not freed until its refcount goes to zero.
1388  */
1389 void of_detach_node(struct device_node *np)
1390 {
1391         struct device_node *parent;
1392         unsigned long flags;
1393
1394         write_lock_irqsave(&devtree_lock, flags);
1395
1396         parent = np->parent;
1397         if (!parent)
1398                 goto out_unlock;
1399
1400         if (allnodes == np)
1401                 allnodes = np->allnext;
1402         else {
1403                 struct device_node *prev;
1404                 for (prev = allnodes;
1405                      prev->allnext != np;
1406                      prev = prev->allnext)
1407                         ;
1408                 prev->allnext = np->allnext;
1409         }
1410
1411         if (parent->child == np)
1412                 parent->child = np->sibling;
1413         else {
1414                 struct device_node *prevsib;
1415                 for (prevsib = np->parent->child;
1416                      prevsib->sibling != np;
1417                      prevsib = prevsib->sibling)
1418                         ;
1419                 prevsib->sibling = np->sibling;
1420         }
1421
1422         of_node_set_flag(np, OF_DETACHED);
1423
1424 out_unlock:
1425         write_unlock_irqrestore(&devtree_lock, flags);
1426 }
1427
1428 #ifdef CONFIG_PPC_PSERIES
1429 /*
1430  * Fix up the uninitialized fields in a new device node:
1431  * name, type and pci-specific fields
1432  */
1433
1434 static int of_finish_dynamic_node(struct device_node *node)
1435 {
1436         struct device_node *parent = of_get_parent(node);
1437         int err = 0;
1438         const phandle *ibm_phandle;
1439
1440         node->name = of_get_property(node, "name", NULL);
1441         node->type = of_get_property(node, "device_type", NULL);
1442
1443         if (!node->name)
1444                 node->name = "<NULL>";
1445         if (!node->type)
1446                 node->type = "<NULL>";
1447
1448         if (!parent) {
1449                 err = -ENODEV;
1450                 goto out;
1451         }
1452
1453         /* We don't support that function on PowerMac, at least
1454          * not yet
1455          */
1456         if (machine_is(powermac))
1457                 return -ENODEV;
1458
1459         /* fix up new node's linux_phandle field */
1460         if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1461                 node->linux_phandle = *ibm_phandle;
1462
1463 out:
1464         of_node_put(parent);
1465         return err;
1466 }
1467
1468 static int prom_reconfig_notifier(struct notifier_block *nb,
1469                                   unsigned long action, void *node)
1470 {
1471         int err;
1472
1473         switch (action) {
1474         case PSERIES_RECONFIG_ADD:
1475                 err = of_finish_dynamic_node(node);
1476                 if (err < 0) {
1477                         printk(KERN_ERR "finish_node returned %d\n", err);
1478                         err = NOTIFY_BAD;
1479                 }
1480                 break;
1481         default:
1482                 err = NOTIFY_DONE;
1483                 break;
1484         }
1485         return err;
1486 }
1487
1488 static struct notifier_block prom_reconfig_nb = {
1489         .notifier_call = prom_reconfig_notifier,
1490         .priority = 10, /* This one needs to run first */
1491 };
1492
1493 static int __init prom_reconfig_setup(void)
1494 {
1495         return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1496 }
1497 __initcall(prom_reconfig_setup);
1498 #endif
1499
1500 /*
1501  * Add a property to a node
1502  */
1503 int prom_add_property(struct device_node* np, struct property* prop)
1504 {
1505         struct property **next;
1506         unsigned long flags;
1507
1508         prop->next = NULL;      
1509         write_lock_irqsave(&devtree_lock, flags);
1510         next = &np->properties;
1511         while (*next) {
1512                 if (strcmp(prop->name, (*next)->name) == 0) {
1513                         /* duplicate ! don't insert it */
1514                         write_unlock_irqrestore(&devtree_lock, flags);
1515                         return -1;
1516                 }
1517                 next = &(*next)->next;
1518         }
1519         *next = prop;
1520         write_unlock_irqrestore(&devtree_lock, flags);
1521
1522 #ifdef CONFIG_PROC_DEVICETREE
1523         /* try to add to proc as well if it was initialized */
1524         if (np->pde)
1525                 proc_device_tree_add_prop(np->pde, prop);
1526 #endif /* CONFIG_PROC_DEVICETREE */
1527
1528         return 0;
1529 }
1530
1531 /*
1532  * Remove a property from a node.  Note that we don't actually
1533  * remove it, since we have given out who-knows-how-many pointers
1534  * to the data using get-property.  Instead we just move the property
1535  * to the "dead properties" list, so it won't be found any more.
1536  */
1537 int prom_remove_property(struct device_node *np, struct property *prop)
1538 {
1539         struct property **next;
1540         unsigned long flags;
1541         int found = 0;
1542
1543         write_lock_irqsave(&devtree_lock, flags);
1544         next = &np->properties;
1545         while (*next) {
1546                 if (*next == prop) {
1547                         /* found the node */
1548                         *next = prop->next;
1549                         prop->next = np->deadprops;
1550                         np->deadprops = prop;
1551                         found = 1;
1552                         break;
1553                 }
1554                 next = &(*next)->next;
1555         }
1556         write_unlock_irqrestore(&devtree_lock, flags);
1557
1558         if (!found)
1559                 return -ENODEV;
1560
1561 #ifdef CONFIG_PROC_DEVICETREE
1562         /* try to remove the proc node as well */
1563         if (np->pde)
1564                 proc_device_tree_remove_prop(np->pde, prop);
1565 #endif /* CONFIG_PROC_DEVICETREE */
1566
1567         return 0;
1568 }
1569
1570 /*
1571  * Update a property in a node.  Note that we don't actually
1572  * remove it, since we have given out who-knows-how-many pointers
1573  * to the data using get-property.  Instead we just move the property
1574  * to the "dead properties" list, and add the new property to the
1575  * property list
1576  */
1577 int prom_update_property(struct device_node *np,
1578                          struct property *newprop,
1579                          struct property *oldprop)
1580 {
1581         struct property **next;
1582         unsigned long flags;
1583         int found = 0;
1584
1585         write_lock_irqsave(&devtree_lock, flags);
1586         next = &np->properties;
1587         while (*next) {
1588                 if (*next == oldprop) {
1589                         /* found the node */
1590                         newprop->next = oldprop->next;
1591                         *next = newprop;
1592                         oldprop->next = np->deadprops;
1593                         np->deadprops = oldprop;
1594                         found = 1;
1595                         break;
1596                 }
1597                 next = &(*next)->next;
1598         }
1599         write_unlock_irqrestore(&devtree_lock, flags);
1600
1601         if (!found)
1602                 return -ENODEV;
1603
1604 #ifdef CONFIG_PROC_DEVICETREE
1605         /* try to add to proc as well if it was initialized */
1606         if (np->pde)
1607                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1608 #endif /* CONFIG_PROC_DEVICETREE */
1609
1610         return 0;
1611 }
1612
1613
1614 /* Find the device node for a given logical cpu number, also returns the cpu
1615  * local thread number (index in ibm,interrupt-server#s) if relevant and
1616  * asked for (non NULL)
1617  */
1618 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1619 {
1620         int hardid;
1621         struct device_node *np;
1622
1623         hardid = get_hard_smp_processor_id(cpu);
1624
1625         for_each_node_by_type(np, "cpu") {
1626                 const u32 *intserv;
1627                 unsigned int plen, t;
1628
1629                 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1630                  * fallback to "reg" property and assume no threads
1631                  */
1632                 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1633                                 &plen);
1634                 if (intserv == NULL) {
1635                         const u32 *reg = of_get_property(np, "reg", NULL);
1636                         if (reg == NULL)
1637                                 continue;
1638                         if (*reg == hardid) {
1639                                 if (thread)
1640                                         *thread = 0;
1641                                 return np;
1642                         }
1643                 } else {
1644                         plen /= sizeof(u32);
1645                         for (t = 0; t < plen; t++) {
1646                                 if (hardid == intserv[t]) {
1647                                         if (thread)
1648                                                 *thread = t;
1649                                         return np;
1650                                 }
1651                         }
1652                 }
1653         }
1654         return NULL;
1655 }
1656 EXPORT_SYMBOL(of_get_cpu_node);
1657
1658 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1659 static struct debugfs_blob_wrapper flat_dt_blob;
1660
1661 static int __init export_flat_device_tree(void)
1662 {
1663         struct dentry *d;
1664
1665         flat_dt_blob.data = initial_boot_params;
1666         flat_dt_blob.size = initial_boot_params->totalsize;
1667
1668         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1669                                 powerpc_debugfs_root, &flat_dt_blob);
1670         if (!d)
1671                 return 1;
1672
1673         return 0;
1674 }
1675 __initcall(export_flat_device_tree);
1676 #endif