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-rw-r--r--arch/microblaze/kernel/prom.c990
1 files changed, 13 insertions, 977 deletions
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index b817df172aa9..a15ef6d67ca9 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -42,698 +42,21 @@
42#include <asm/sections.h> 42#include <asm/sections.h>
43#include <asm/pci-bridge.h> 43#include <asm/pci-bridge.h>
44 44
45static int __initdata dt_root_addr_cells; 45void __init early_init_dt_scan_chosen_arch(unsigned long node)
46static int __initdata dt_root_size_cells;
47
48typedef u32 cell_t;
49
50static struct boot_param_header *initial_boot_params;
51
52/* export that to outside world */
53struct device_node *of_chosen;
54
55static 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 */
66int __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
122unsigned 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 */
138void *__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
176int __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
195static 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
207static 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 */
396void __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
441static 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
503static 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
529static inline void early_init_dt_check_for_initrd(unsigned long node)
530{
531}
532#endif /* CONFIG_BLK_DEV_INITRD */
533
534static 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
579static 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
599static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
600{ 46{
601 cell_t *p = *cellp; 47 /* No Microblaze specific code here */
602
603 *cellp = p + s;
604 return of_read_number(p, s);
605} 48}
606 49
607static int __init early_init_dt_scan_memory(unsigned long node, 50void __init early_init_dt_add_memory_arch(u64 base, u64 size)
608 const char *uname, int depth, void *data)
609{ 51{
610 char *type = of_get_flat_dt_prop(node, "device_type", NULL); 52 lmb_add(base, size);
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} 53}
656 54
657#ifdef CONFIG_PHYP_DUMP 55u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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 */
668static inline unsigned long phyp_dump_calculate_reserve_size(void)
669{ 56{
670 unsigned long tmp; 57 return lmb_alloc(size, align);
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} 58}
684 59
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 */
695static 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
734static inline void __init phyp_dump_reserve_mem(void) {}
735#endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
736
737#ifdef CONFIG_EARLY_PRINTK 60#ifdef CONFIG_EARLY_PRINTK
738/* MS this is Microblaze specifig function */ 61/* MS this is Microblaze specifig function */
739static int __init early_init_dt_scan_serial(unsigned long node, 62static int __init early_init_dt_scan_serial(unsigned long node,
@@ -775,11 +98,6 @@ void __init early_init_devtree(void *params)
775 /* Setup flat device-tree pointer */ 98 /* Setup flat device-tree pointer */
776 initial_boot_params = params; 99 initial_boot_params = params;
777 100
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 101 /* Retrieve various informations from the /chosen node of the
784 * device-tree, including the platform type, initrd location and 102 * device-tree, including the platform type, initrd location and
785 * size, TCE reserve, and more ... 103 * size, TCE reserve, and more ...
@@ -799,33 +117,18 @@ void __init early_init_devtree(void *params)
799 117
800 pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size()); 118 pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
801 119
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"); 120 pr_debug(" <- early_init_devtree()\n");
810} 121}
811 122
812/** 123#ifdef CONFIG_BLK_DEV_INITRD
813 * Indicates whether the root node has a given value in its 124void __init early_init_dt_setup_initrd_arch(unsigned long start,
814 * compatible property. 125 unsigned long end)
815 */
816int machine_is_compatible(const char *compat)
817{ 126{
818 struct device_node *root; 127 initrd_start = (unsigned long)__va(start);
819 int rc = 0; 128 initrd_end = (unsigned long)__va(end);
820 129 initrd_below_start_ok = 1;
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} 130}
828EXPORT_SYMBOL(machine_is_compatible); 131#endif
829 132
830/******* 133/*******
831 * 134 *
@@ -838,273 +141,6 @@ EXPORT_SYMBOL(machine_is_compatible);
838 * 141 *
839 *******/ 142 *******/
840 143
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 */
848struct 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}
860EXPORT_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 */
869struct device_node *of_node_get(struct device_node *node)
870{
871 if (node)
872 kref_get(&node->kref);
873 return node;
874}
875EXPORT_SYMBOL(of_node_get);
876
877static 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 */
889static 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 */
929void of_node_put(struct device_node *node)
930{
931 if (node)
932 kref_put(&node->kref, of_node_release);
933}
934EXPORT_SYMBOL(of_node_put);
935
936/*
937 * Plug a device node into the tree and global list.
938 */
939void 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 */
956void 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
991out_unlock:
992 write_unlock_irqrestore(&devtree_lock, flags);
993}
994
995/*
996 * Add a property to a node
997 */
998int 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 */
1032int 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 */
1072int 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) 144#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1109static struct debugfs_blob_wrapper flat_dt_blob; 145static struct debugfs_blob_wrapper flat_dt_blob;
1110 146
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