of: merge of_find_all_nodes() implementations
[linux-2.6.git] / arch / microblaze / 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 #include <stdarg.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/threads.h>
21 #include <linux/spinlock.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/stringify.h>
25 #include <linux/delay.h>
26 #include <linux/initrd.h>
27 #include <linux/bitops.h>
28 #include <linux/module.h>
29 #include <linux/kexec.h>
30 #include <linux/debugfs.h>
31 #include <linux/irq.h>
32 #include <linux/lmb.h>
33
34 #include <asm/prom.h>
35 #include <asm/page.h>
36 #include <asm/processor.h>
37 #include <asm/irq.h>
38 #include <linux/io.h>
39 #include <asm/system.h>
40 #include <asm/mmu.h>
41 #include <asm/pgtable.h>
42 #include <asm/sections.h>
43 #include <asm/pci-bridge.h>
44
45 static int __initdata dt_root_addr_cells;
46 static int __initdata dt_root_size_cells;
47
48 typedef u32 cell_t;
49
50 static struct boot_param_header *initial_boot_params;
51
52 /* export that to outside world */
53 struct device_node *of_chosen;
54
55 static inline char *find_flat_dt_string(u32 offset)
56 {
57         return ((char *)initial_boot_params) +
58                 initial_boot_params->off_dt_strings + offset;
59 }
60
61 /**
62  * This function is used to scan the flattened device-tree, it is
63  * used to extract the memory informations at boot before we can
64  * unflatten the tree
65  */
66 int __init of_scan_flat_dt(int (*it)(unsigned long node,
67                                      const char *uname, int depth,
68                                      void *data),
69                            void *data)
70 {
71         unsigned long p = ((unsigned long)initial_boot_params) +
72                 initial_boot_params->off_dt_struct;
73         int rc = 0;
74         int depth = -1;
75
76         do {
77                 u32 tag = *((u32 *)p);
78                 char *pathp;
79
80                 p += 4;
81                 if (tag == OF_DT_END_NODE) {
82                         depth--;
83                         continue;
84                 }
85                 if (tag == OF_DT_NOP)
86                         continue;
87                 if (tag == OF_DT_END)
88                         break;
89                 if (tag == OF_DT_PROP) {
90                         u32 sz = *((u32 *)p);
91                         p += 8;
92                         if (initial_boot_params->version < 0x10)
93                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
94                         p += sz;
95                         p = _ALIGN(p, 4);
96                         continue;
97                 }
98                 if (tag != OF_DT_BEGIN_NODE) {
99                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
100                                 " device tree !\n", tag);
101                         return -EINVAL;
102                 }
103                 depth++;
104                 pathp = (char *)p;
105                 p = _ALIGN(p + strlen(pathp) + 1, 4);
106                 if ((*pathp) == '/') {
107                         char *lp, *np;
108                         for (lp = NULL, np = pathp; *np; np++)
109                                 if ((*np) == '/')
110                                         lp = np+1;
111                         if (lp != NULL)
112                                 pathp = lp;
113                 }
114                 rc = it(p, pathp, depth, data);
115                 if (rc != 0)
116                         break;
117         } while (1);
118
119         return rc;
120 }
121
122 unsigned long __init of_get_flat_dt_root(void)
123 {
124         unsigned long p = ((unsigned long)initial_boot_params) +
125                 initial_boot_params->off_dt_struct;
126
127         while (*((u32 *)p) == OF_DT_NOP)
128                 p += 4;
129         BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
130         p += 4;
131         return _ALIGN(p + strlen((char *)p) + 1, 4);
132 }
133
134 /**
135  * This function can be used within scan_flattened_dt callback to get
136  * access to properties
137  */
138 void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
139                                 unsigned long *size)
140 {
141         unsigned long p = node;
142
143         do {
144                 u32 tag = *((u32 *)p);
145                 u32 sz, noff;
146                 const char *nstr;
147
148                 p += 4;
149                 if (tag == OF_DT_NOP)
150                         continue;
151                 if (tag != OF_DT_PROP)
152                         return NULL;
153
154                 sz = *((u32 *)p);
155                 noff = *((u32 *)(p + 4));
156                 p += 8;
157                 if (initial_boot_params->version < 0x10)
158                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
159
160                 nstr = find_flat_dt_string(noff);
161                 if (nstr == NULL) {
162                         printk(KERN_WARNING "Can't find property index"
163                                 " name !\n");
164                         return NULL;
165                 }
166                 if (strcmp(name, nstr) == 0) {
167                         if (size)
168                                 *size = sz;
169                         return (void *)p;
170                 }
171                 p += sz;
172                 p = _ALIGN(p, 4);
173         } while (1);
174 }
175
176 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
177 {
178         const char *cp;
179         unsigned long cplen, l;
180
181         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
182         if (cp == NULL)
183                 return 0;
184         while (cplen > 0) {
185                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
186                         return 1;
187                 l = strlen(cp) + 1;
188                 cp += l;
189                 cplen -= l;
190         }
191
192         return 0;
193 }
194
195 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
196                                         unsigned long align)
197 {
198         void *res;
199
200         *mem = _ALIGN(*mem, align);
201         res = (void *)*mem;
202         *mem += size;
203
204         return res;
205 }
206
207 static unsigned long __init unflatten_dt_node(unsigned long mem,
208                                         unsigned long *p,
209                                         struct device_node *dad,
210                                         struct device_node ***allnextpp,
211                                         unsigned long fpsize)
212 {
213         struct device_node *np;
214         struct property *pp, **prev_pp = NULL;
215         char *pathp;
216         u32 tag;
217         unsigned int l, allocl;
218         int has_name = 0;
219         int new_format = 0;
220
221         tag = *((u32 *)(*p));
222         if (tag != OF_DT_BEGIN_NODE) {
223                 printk("Weird tag at start of node: %x\n", tag);
224                 return mem;
225         }
226         *p += 4;
227         pathp = (char *)*p;
228         l = allocl = strlen(pathp) + 1;
229         *p = _ALIGN(*p + l, 4);
230
231         /* version 0x10 has a more compact unit name here instead of the full
232          * path. we accumulate the full path size using "fpsize", we'll rebuild
233          * it later. We detect this because the first character of the name is
234          * not '/'.
235          */
236         if ((*pathp) != '/') {
237                 new_format = 1;
238                 if (fpsize == 0) {
239                         /* root node: special case. fpsize accounts for path
240                          * plus terminating zero. root node only has '/', so
241                          * fpsize should be 2, but we want to avoid the first
242                          * level nodes to have two '/' so we use fpsize 1 here
243                          */
244                         fpsize = 1;
245                         allocl = 2;
246                 } else {
247                         /* account for '/' and path size minus terminal 0
248                          * already in 'l'
249                          */
250                         fpsize += l;
251                         allocl = fpsize;
252                 }
253         }
254
255         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
256                                 __alignof__(struct device_node));
257         if (allnextpp) {
258                 memset(np, 0, sizeof(*np));
259                 np->full_name = ((char *)np) + sizeof(struct device_node);
260                 if (new_format) {
261                         char *p2 = np->full_name;
262                         /* rebuild full path for new format */
263                         if (dad && dad->parent) {
264                                 strcpy(p2, dad->full_name);
265 #ifdef DEBUG
266                                 if ((strlen(p2) + l + 1) != allocl) {
267                                         pr_debug("%s: p: %d, l: %d, a: %d\n",
268                                                 pathp, (int)strlen(p2),
269                                                 l, allocl);
270                                 }
271 #endif
272                                 p2 += strlen(p2);
273                         }
274                         *(p2++) = '/';
275                         memcpy(p2, pathp, l);
276                 } else
277                         memcpy(np->full_name, pathp, l);
278                 prev_pp = &np->properties;
279                 **allnextpp = np;
280                 *allnextpp = &np->allnext;
281                 if (dad != NULL) {
282                         np->parent = dad;
283                         /* we temporarily use the next field as `last_child'*/
284                         if (dad->next == NULL)
285                                 dad->child = np;
286                         else
287                                 dad->next->sibling = np;
288                         dad->next = np;
289                 }
290                 kref_init(&np->kref);
291         }
292         while (1) {
293                 u32 sz, noff;
294                 char *pname;
295
296                 tag = *((u32 *)(*p));
297                 if (tag == OF_DT_NOP) {
298                         *p += 4;
299                         continue;
300                 }
301                 if (tag != OF_DT_PROP)
302                         break;
303                 *p += 4;
304                 sz = *((u32 *)(*p));
305                 noff = *((u32 *)((*p) + 4));
306                 *p += 8;
307                 if (initial_boot_params->version < 0x10)
308                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
309
310                 pname = find_flat_dt_string(noff);
311                 if (pname == NULL) {
312                         printk(KERN_INFO
313                                 "Can't find property name in list !\n");
314                         break;
315                 }
316                 if (strcmp(pname, "name") == 0)
317                         has_name = 1;
318                 l = strlen(pname) + 1;
319                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
320                                         __alignof__(struct property));
321                 if (allnextpp) {
322                         if (strcmp(pname, "linux,phandle") == 0) {
323                                 np->node = *((u32 *)*p);
324                                 if (np->linux_phandle == 0)
325                                         np->linux_phandle = np->node;
326                         }
327                         if (strcmp(pname, "ibm,phandle") == 0)
328                                 np->linux_phandle = *((u32 *)*p);
329                         pp->name = pname;
330                         pp->length = sz;
331                         pp->value = (void *)*p;
332                         *prev_pp = pp;
333                         prev_pp = &pp->next;
334                 }
335                 *p = _ALIGN((*p) + sz, 4);
336         }
337         /* with version 0x10 we may not have the name property, recreate
338          * it here from the unit name if absent
339          */
340         if (!has_name) {
341                 char *p1 = pathp, *ps = pathp, *pa = NULL;
342                 int sz;
343
344                 while (*p1) {
345                         if ((*p1) == '@')
346                                 pa = p1;
347                         if ((*p1) == '/')
348                                 ps = p1 + 1;
349                         p1++;
350                 }
351                 if (pa < ps)
352                         pa = p1;
353                 sz = (pa - ps) + 1;
354                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
355                                         __alignof__(struct property));
356                 if (allnextpp) {
357                         pp->name = "name";
358                         pp->length = sz;
359                         pp->value = pp + 1;
360                         *prev_pp = pp;
361                         prev_pp = &pp->next;
362                         memcpy(pp->value, ps, sz - 1);
363                         ((char *)pp->value)[sz - 1] = 0;
364                         pr_debug("fixed up name for %s -> %s\n", pathp,
365                                 (char *)pp->value);
366                 }
367         }
368         if (allnextpp) {
369                 *prev_pp = NULL;
370                 np->name = of_get_property(np, "name", NULL);
371                 np->type = of_get_property(np, "device_type", NULL);
372
373                 if (!np->name)
374                         np->name = "<NULL>";
375                 if (!np->type)
376                         np->type = "<NULL>";
377         }
378         while (tag == OF_DT_BEGIN_NODE) {
379                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
380                 tag = *((u32 *)(*p));
381         }
382         if (tag != OF_DT_END_NODE) {
383                 printk(KERN_INFO "Weird tag at end of node: %x\n", tag);
384                 return mem;
385         }
386         *p += 4;
387         return mem;
388 }
389
390 /**
391  * unflattens the device-tree passed by the firmware, creating the
392  * tree of struct device_node. It also fills the "name" and "type"
393  * pointers of the nodes so the normal device-tree walking functions
394  * can be used (this used to be done by finish_device_tree)
395  */
396 void __init unflatten_device_tree(void)
397 {
398         unsigned long start, mem, size;
399         struct device_node **allnextp = &allnodes;
400
401         pr_debug(" -> unflatten_device_tree()\n");
402
403         /* First pass, scan for size */
404         start = ((unsigned long)initial_boot_params) +
405                 initial_boot_params->off_dt_struct;
406         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
407         size = (size | 3) + 1;
408
409         pr_debug("  size is %lx, allocating...\n", size);
410
411         /* Allocate memory for the expanded device tree */
412         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
413         mem = (unsigned long) __va(mem);
414
415         ((u32 *)mem)[size / 4] = 0xdeadbeef;
416
417         pr_debug("  unflattening %lx...\n", mem);
418
419         /* Second pass, do actual unflattening */
420         start = ((unsigned long)initial_boot_params) +
421                 initial_boot_params->off_dt_struct;
422         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
423         if (*((u32 *)start) != OF_DT_END)
424                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n",
425                         *((u32 *)start));
426         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
427                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
428                         ((u32 *)mem)[size / 4]);
429         *allnextp = NULL;
430
431         /* Get pointer to OF "/chosen" node for use everywhere */
432         of_chosen = of_find_node_by_path("/chosen");
433         if (of_chosen == NULL)
434                 of_chosen = of_find_node_by_path("/chosen@0");
435
436         pr_debug(" <- unflatten_device_tree()\n");
437 }
438
439 #define early_init_dt_scan_drconf_memory(node) 0
440
441 static int __init early_init_dt_scan_cpus(unsigned long node,
442                                           const char *uname, int depth,
443                                           void *data)
444 {
445         static int logical_cpuid;
446         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
447         const u32 *intserv;
448         int i, nthreads;
449         int found = 0;
450
451         /* We are scanning "cpu" nodes only */
452         if (type == NULL || strcmp(type, "cpu") != 0)
453                 return 0;
454
455         /* Get physical cpuid */
456         intserv = of_get_flat_dt_prop(node, "reg", NULL);
457         nthreads = 1;
458
459         /*
460          * Now see if any of these threads match our boot cpu.
461          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
462          */
463         for (i = 0; i < nthreads; i++) {
464                 /*
465                  * version 2 of the kexec param format adds the phys cpuid of
466                  * booted proc.
467                  */
468                 if (initial_boot_params && initial_boot_params->version >= 2) {
469                         if (intserv[i] ==
470                                         initial_boot_params->boot_cpuid_phys) {
471                                 found = 1;
472                                 break;
473                         }
474                 } else {
475                         /*
476                          * Check if it's the boot-cpu, set it's hw index now,
477                          * unfortunately this format did not support booting
478                          * off secondary threads.
479                          */
480                         if (of_get_flat_dt_prop(node,
481                                         "linux,boot-cpu", NULL) != NULL) {
482                                 found = 1;
483                                 break;
484                         }
485                 }
486
487 #ifdef CONFIG_SMP
488                 /* logical cpu id is always 0 on UP kernels */
489                 logical_cpuid++;
490 #endif
491         }
492
493         if (found) {
494                 pr_debug("boot cpu: logical %d physical %d\n", logical_cpuid,
495                         intserv[i]);
496                 boot_cpuid = logical_cpuid;
497         }
498
499         return 0;
500 }
501
502 #ifdef CONFIG_BLK_DEV_INITRD
503 static void __init early_init_dt_check_for_initrd(unsigned long node)
504 {
505         unsigned long l;
506         u32 *prop;
507
508         pr_debug("Looking for initrd properties... ");
509
510         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
511         if (prop) {
512                 initrd_start = (unsigned long)
513                                         __va((u32)of_read_ulong(prop, l/4));
514
515                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
516                 if (prop) {
517                         initrd_end = (unsigned long)
518                                         __va((u32)of_read_ulong(prop, 1/4));
519                         initrd_below_start_ok = 1;
520                 } else {
521                         initrd_start = 0;
522                 }
523         }
524
525         pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n",
526                                         initrd_start, initrd_end);
527 }
528 #else
529 static inline void early_init_dt_check_for_initrd(unsigned long node)
530 {
531 }
532 #endif /* CONFIG_BLK_DEV_INITRD */
533
534 static int __init early_init_dt_scan_chosen(unsigned long node,
535                                 const char *uname, int depth, void *data)
536 {
537         unsigned long l;
538         char *p;
539
540         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
541
542         if (depth != 1 ||
543                 (strcmp(uname, "chosen") != 0 &&
544                                 strcmp(uname, "chosen@0") != 0))
545                 return 0;
546
547 #ifdef CONFIG_KEXEC
548         lprop = (u64 *)of_get_flat_dt_prop(node,
549                                 "linux,crashkernel-base", NULL);
550         if (lprop)
551                 crashk_res.start = *lprop;
552
553         lprop = (u64 *)of_get_flat_dt_prop(node,
554                                 "linux,crashkernel-size", NULL);
555         if (lprop)
556                 crashk_res.end = crashk_res.start + *lprop - 1;
557 #endif
558
559         early_init_dt_check_for_initrd(node);
560
561         /* Retreive command line */
562         p = of_get_flat_dt_prop(node, "bootargs", &l);
563         if (p != NULL && l > 0)
564                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
565
566 #ifdef CONFIG_CMDLINE
567 #ifndef CONFIG_CMDLINE_FORCE
568         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
569 #endif
570                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
571 #endif /* CONFIG_CMDLINE */
572
573         pr_debug("Command line is: %s\n", cmd_line);
574
575         /* break now */
576         return 1;
577 }
578
579 static int __init early_init_dt_scan_root(unsigned long node,
580                                 const char *uname, int depth, void *data)
581 {
582         u32 *prop;
583
584         if (depth != 0)
585                 return 0;
586
587         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
588         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
589         pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
590
591         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
592         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
593         pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
594
595         /* break now */
596         return 1;
597 }
598
599 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
600 {
601         cell_t *p = *cellp;
602
603         *cellp = p + s;
604         return of_read_number(p, s);
605 }
606
607 static int __init early_init_dt_scan_memory(unsigned long node,
608                                 const char *uname, int depth, void *data)
609 {
610         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
611         cell_t *reg, *endp;
612         unsigned long l;
613
614         /* Look for the ibm,dynamic-reconfiguration-memory node */
615 /*      if (depth == 1 &&
616                 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
617                 return early_init_dt_scan_drconf_memory(node);
618 */
619         /* We are scanning "memory" nodes only */
620         if (type == NULL) {
621                 /*
622                  * The longtrail doesn't have a device_type on the
623                  * /memory node, so look for the node called /memory@0.
624                  */
625                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
626                         return 0;
627         } else if (strcmp(type, "memory") != 0)
628                 return 0;
629
630         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
631         if (reg == NULL)
632                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
633         if (reg == NULL)
634                 return 0;
635
636         endp = reg + (l / sizeof(cell_t));
637
638         pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
639                 uname, l, reg[0], reg[1], reg[2], reg[3]);
640
641         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
642                 u64 base, size;
643
644                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
645                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
646
647                 if (size == 0)
648                         continue;
649                 pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
650                         (unsigned long long)size);
651
652                 lmb_add(base, size);
653         }
654         return 0;
655 }
656
657 #ifdef CONFIG_PHYP_DUMP
658 /**
659  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
660  *
661  * Function to find the largest size we need to reserve
662  * during early boot process.
663  *
664  * It either looks for boot param and returns that OR
665  * returns larger of 256 or 5% rounded down to multiples of 256MB.
666  *
667  */
668 static inline unsigned long phyp_dump_calculate_reserve_size(void)
669 {
670         unsigned long tmp;
671
672         if (phyp_dump_info->reserve_bootvar)
673                 return phyp_dump_info->reserve_bootvar;
674
675         /* divide by 20 to get 5% of value */
676         tmp = lmb_end_of_DRAM();
677         do_div(tmp, 20);
678
679         /* round it down in multiples of 256 */
680         tmp = tmp & ~0x0FFFFFFFUL;
681
682         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
683 }
684
685 /**
686  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
687  *
688  * This routine may reserve memory regions in the kernel only
689  * if the system is supported and a dump was taken in last
690  * boot instance or if the hardware is supported and the
691  * scratch area needs to be setup. In other instances it returns
692  * without reserving anything. The memory in case of dump being
693  * active is freed when the dump is collected (by userland tools).
694  */
695 static void __init phyp_dump_reserve_mem(void)
696 {
697         unsigned long base, size;
698         unsigned long variable_reserve_size;
699
700         if (!phyp_dump_info->phyp_dump_configured) {
701                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
702                 return;
703         }
704
705         if (!phyp_dump_info->phyp_dump_at_boot) {
706                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
707                 return;
708         }
709
710         variable_reserve_size = phyp_dump_calculate_reserve_size();
711
712         if (phyp_dump_info->phyp_dump_is_active) {
713                 /* Reserve *everything* above RMR.Area freed by userland tools*/
714                 base = variable_reserve_size;
715                 size = lmb_end_of_DRAM() - base;
716
717                 /* XXX crashed_ram_end is wrong, since it may be beyond
718                  * the memory_limit, it will need to be adjusted. */
719                 lmb_reserve(base, size);
720
721                 phyp_dump_info->init_reserve_start = base;
722                 phyp_dump_info->init_reserve_size = size;
723         } else {
724                 size = phyp_dump_info->cpu_state_size +
725                         phyp_dump_info->hpte_region_size +
726                         variable_reserve_size;
727                 base = lmb_end_of_DRAM() - size;
728                 lmb_reserve(base, size);
729                 phyp_dump_info->init_reserve_start = base;
730                 phyp_dump_info->init_reserve_size = size;
731         }
732 }
733 #else
734 static inline void __init phyp_dump_reserve_mem(void) {}
735 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
736
737 #ifdef CONFIG_EARLY_PRINTK
738 /* MS this is Microblaze specifig function */
739 static int __init early_init_dt_scan_serial(unsigned long node,
740                                 const char *uname, int depth, void *data)
741 {
742         unsigned long l;
743         char *p;
744         int *addr;
745
746         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
747
748 /* find all serial nodes */
749         if (strncmp(uname, "serial", 6) != 0)
750                 return 0;
751
752         early_init_dt_check_for_initrd(node);
753
754 /* find compatible node with uartlite */
755         p = of_get_flat_dt_prop(node, "compatible", &l);
756         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
757                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
758                 return 0;
759
760         addr = of_get_flat_dt_prop(node, "reg", &l);
761         return *addr; /* return address */
762 }
763
764 /* this function is looking for early uartlite console - Microblaze specific */
765 int __init early_uartlite_console(void)
766 {
767         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
768 }
769 #endif
770
771 void __init early_init_devtree(void *params)
772 {
773         pr_debug(" -> early_init_devtree(%p)\n", params);
774
775         /* Setup flat device-tree pointer */
776         initial_boot_params = params;
777
778 #ifdef CONFIG_PHYP_DUMP
779         /* scan tree to see if dump occured during last boot */
780         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
781 #endif
782
783         /* Retrieve various informations from the /chosen node of the
784          * device-tree, including the platform type, initrd location and
785          * size, TCE reserve, and more ...
786          */
787         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
788
789         /* Scan memory nodes and rebuild LMBs */
790         lmb_init();
791         of_scan_flat_dt(early_init_dt_scan_root, NULL);
792         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
793
794         /* Save command line for /proc/cmdline and then parse parameters */
795         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
796         parse_early_param();
797
798         lmb_analyze();
799
800         pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
801
802         pr_debug("Scanning CPUs ...\n");
803
804         /* Retreive CPU related informations from the flat tree
805          * (altivec support, boot CPU ID, ...)
806          */
807         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
808
809         pr_debug(" <- early_init_devtree()\n");
810 }
811
812 /**
813  * Indicates whether the root node has a given value in its
814  * compatible property.
815  */
816 int machine_is_compatible(const char *compat)
817 {
818         struct device_node *root;
819         int rc = 0;
820
821         root = of_find_node_by_path("/");
822         if (root) {
823                 rc = of_device_is_compatible(root, compat);
824                 of_node_put(root);
825         }
826         return rc;
827 }
828 EXPORT_SYMBOL(machine_is_compatible);
829
830 /*******
831  *
832  * New implementation of the OF "find" APIs, return a refcounted
833  * object, call of_node_put() when done.  The device tree and list
834  * are protected by a rw_lock.
835  *
836  * Note that property management will need some locking as well,
837  * this isn't dealt with yet.
838  *
839  *******/
840
841 /**
842  *      of_find_node_by_phandle - Find a node given a phandle
843  *      @handle:        phandle of the node to find
844  *
845  *      Returns a node pointer with refcount incremented, use
846  *      of_node_put() on it when done.
847  */
848 struct device_node *of_find_node_by_phandle(phandle handle)
849 {
850         struct device_node *np;
851
852         read_lock(&devtree_lock);
853         for (np = allnodes; np != NULL; np = np->allnext)
854                 if (np->linux_phandle == handle)
855                         break;
856         of_node_get(np);
857         read_unlock(&devtree_lock);
858         return np;
859 }
860 EXPORT_SYMBOL(of_find_node_by_phandle);
861
862 /**
863  *      of_node_get - Increment refcount of a node
864  *      @node:  Node to inc refcount, NULL is supported to
865  *              simplify writing of callers
866  *
867  *      Returns node.
868  */
869 struct device_node *of_node_get(struct device_node *node)
870 {
871         if (node)
872                 kref_get(&node->kref);
873         return node;
874 }
875 EXPORT_SYMBOL(of_node_get);
876
877 static inline struct device_node *kref_to_device_node(struct kref *kref)
878 {
879         return container_of(kref, struct device_node, kref);
880 }
881
882 /**
883  *      of_node_release - release a dynamically allocated node
884  *      @kref:  kref element of the node to be released
885  *
886  *      In of_node_put() this function is passed to kref_put()
887  *      as the destructor.
888  */
889 static void of_node_release(struct kref *kref)
890 {
891         struct device_node *node = kref_to_device_node(kref);
892         struct property *prop = node->properties;
893
894         /* We should never be releasing nodes that haven't been detached. */
895         if (!of_node_check_flag(node, OF_DETACHED)) {
896                 printk(KERN_INFO "WARNING: Bad of_node_put() on %s\n",
897                         node->full_name);
898                 dump_stack();
899                 kref_init(&node->kref);
900                 return;
901         }
902
903         if (!of_node_check_flag(node, OF_DYNAMIC))
904                 return;
905
906         while (prop) {
907                 struct property *next = prop->next;
908                 kfree(prop->name);
909                 kfree(prop->value);
910                 kfree(prop);
911                 prop = next;
912
913                 if (!prop) {
914                         prop = node->deadprops;
915                         node->deadprops = NULL;
916                 }
917         }
918         kfree(node->full_name);
919         kfree(node->data);
920         kfree(node);
921 }
922
923 /**
924  *      of_node_put - Decrement refcount of a node
925  *      @node:  Node to dec refcount, NULL is supported to
926  *              simplify writing of callers
927  *
928  */
929 void of_node_put(struct device_node *node)
930 {
931         if (node)
932                 kref_put(&node->kref, of_node_release);
933 }
934 EXPORT_SYMBOL(of_node_put);
935
936 /*
937  * Plug a device node into the tree and global list.
938  */
939 void of_attach_node(struct device_node *np)
940 {
941         unsigned long flags;
942
943         write_lock_irqsave(&devtree_lock, flags);
944         np->sibling = np->parent->child;
945         np->allnext = allnodes;
946         np->parent->child = np;
947         allnodes = np;
948         write_unlock_irqrestore(&devtree_lock, flags);
949 }
950
951 /*
952  * "Unplug" a node from the device tree.  The caller must hold
953  * a reference to the node.  The memory associated with the node
954  * is not freed until its refcount goes to zero.
955  */
956 void of_detach_node(struct device_node *np)
957 {
958         struct device_node *parent;
959         unsigned long flags;
960
961         write_lock_irqsave(&devtree_lock, flags);
962
963         parent = np->parent;
964         if (!parent)
965                 goto out_unlock;
966
967         if (allnodes == np)
968                 allnodes = np->allnext;
969         else {
970                 struct device_node *prev;
971                 for (prev = allnodes;
972                      prev->allnext != np;
973                      prev = prev->allnext)
974                         ;
975                 prev->allnext = np->allnext;
976         }
977
978         if (parent->child == np)
979                 parent->child = np->sibling;
980         else {
981                 struct device_node *prevsib;
982                 for (prevsib = np->parent->child;
983                      prevsib->sibling != np;
984                      prevsib = prevsib->sibling)
985                         ;
986                 prevsib->sibling = np->sibling;
987         }
988
989         of_node_set_flag(np, OF_DETACHED);
990
991 out_unlock:
992         write_unlock_irqrestore(&devtree_lock, flags);
993 }
994
995 /*
996  * Add a property to a node
997  */
998 int prom_add_property(struct device_node *np, struct property *prop)
999 {
1000         struct property **next;
1001         unsigned long flags;
1002
1003         prop->next = NULL;
1004         write_lock_irqsave(&devtree_lock, flags);
1005         next = &np->properties;
1006         while (*next) {
1007                 if (strcmp(prop->name, (*next)->name) == 0) {
1008                         /* duplicate ! don't insert it */
1009                         write_unlock_irqrestore(&devtree_lock, flags);
1010                         return -1;
1011                 }
1012                 next = &(*next)->next;
1013         }
1014         *next = prop;
1015         write_unlock_irqrestore(&devtree_lock, flags);
1016
1017 #ifdef CONFIG_PROC_DEVICETREE
1018         /* try to add to proc as well if it was initialized */
1019         if (np->pde)
1020                 proc_device_tree_add_prop(np->pde, prop);
1021 #endif /* CONFIG_PROC_DEVICETREE */
1022
1023         return 0;
1024 }
1025
1026 /*
1027  * Remove a property from a node.  Note that we don't actually
1028  * remove it, since we have given out who-knows-how-many pointers
1029  * to the data using get-property.  Instead we just move the property
1030  * to the "dead properties" list, so it won't be found any more.
1031  */
1032 int prom_remove_property(struct device_node *np, struct property *prop)
1033 {
1034         struct property **next;
1035         unsigned long flags;
1036         int found = 0;
1037
1038         write_lock_irqsave(&devtree_lock, flags);
1039         next = &np->properties;
1040         while (*next) {
1041                 if (*next == prop) {
1042                         /* found the node */
1043                         *next = prop->next;
1044                         prop->next = np->deadprops;
1045                         np->deadprops = prop;
1046                         found = 1;
1047                         break;
1048                 }
1049                 next = &(*next)->next;
1050         }
1051         write_unlock_irqrestore(&devtree_lock, flags);
1052
1053         if (!found)
1054                 return -ENODEV;
1055
1056 #ifdef CONFIG_PROC_DEVICETREE
1057         /* try to remove the proc node as well */
1058         if (np->pde)
1059                 proc_device_tree_remove_prop(np->pde, prop);
1060 #endif /* CONFIG_PROC_DEVICETREE */
1061
1062         return 0;
1063 }
1064
1065 /*
1066  * Update a property in a node.  Note that we don't actually
1067  * remove it, since we have given out who-knows-how-many pointers
1068  * to the data using get-property.  Instead we just move the property
1069  * to the "dead properties" list, and add the new property to the
1070  * property list
1071  */
1072 int prom_update_property(struct device_node *np,
1073                          struct property *newprop,
1074                          struct property *oldprop)
1075 {
1076         struct property **next;
1077         unsigned long flags;
1078         int found = 0;
1079
1080         write_lock_irqsave(&devtree_lock, flags);
1081         next = &np->properties;
1082         while (*next) {
1083                 if (*next == oldprop) {
1084                         /* found the node */
1085                         newprop->next = oldprop->next;
1086                         *next = newprop;
1087                         oldprop->next = np->deadprops;
1088                         np->deadprops = oldprop;
1089                         found = 1;
1090                         break;
1091                 }
1092                 next = &(*next)->next;
1093         }
1094         write_unlock_irqrestore(&devtree_lock, flags);
1095
1096         if (!found)
1097                 return -ENODEV;
1098
1099 #ifdef CONFIG_PROC_DEVICETREE
1100         /* try to add to proc as well if it was initialized */
1101         if (np->pde)
1102                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1103 #endif /* CONFIG_PROC_DEVICETREE */
1104
1105         return 0;
1106 }
1107
1108 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1109 static struct debugfs_blob_wrapper flat_dt_blob;
1110
1111 static int __init export_flat_device_tree(void)
1112 {
1113         struct dentry *d;
1114
1115         flat_dt_blob.data = initial_boot_params;
1116         flat_dt_blob.size = initial_boot_params->totalsize;
1117
1118         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1119                                 of_debugfs_root, &flat_dt_blob);
1120         if (!d)
1121                 return 1;
1122
1123         return 0;
1124 }
1125 device_initcall(export_flat_device_tree);
1126 #endif