2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
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.
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>
39 #include <asm/processor.h>
42 #include <asm/kdump.h>
44 #include <asm/system.h>
46 #include <asm/pgtable.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/kexec.h>
55 #include <asm/system.h>
58 #define DBG(fmt...) printk(KERN_ERR fmt)
64 static int __initdata dt_root_addr_cells;
65 static int __initdata dt_root_size_cells;
68 int __initdata iommu_is_off;
69 int __initdata iommu_force_on;
70 unsigned long tce_alloc_start, tce_alloc_end;
76 static struct boot_param_header *initial_boot_params __initdata;
78 struct boot_param_header *initial_boot_params;
81 extern struct device_node *allnodes; /* temporary while merging */
83 extern rwlock_t devtree_lock; /* temporary while merging */
85 /* export that to outside world */
86 struct device_node *of_chosen;
88 static inline char *find_flat_dt_string(u32 offset)
90 return ((char *)initial_boot_params) +
91 initial_boot_params->off_dt_strings + offset;
95 * This function is used to scan the flattened device-tree, it is
96 * used to extract the memory informations at boot before we can
99 int __init of_scan_flat_dt(int (*it)(unsigned long node,
100 const char *uname, int depth,
104 unsigned long p = ((unsigned long)initial_boot_params) +
105 initial_boot_params->off_dt_struct;
110 u32 tag = *((u32 *)p);
114 if (tag == OF_DT_END_NODE) {
118 if (tag == OF_DT_NOP)
120 if (tag == OF_DT_END)
122 if (tag == OF_DT_PROP) {
123 u32 sz = *((u32 *)p);
125 if (initial_boot_params->version < 0x10)
126 p = _ALIGN(p, sz >= 8 ? 8 : 4);
131 if (tag != OF_DT_BEGIN_NODE) {
132 printk(KERN_WARNING "Invalid tag %x scanning flattened"
133 " device tree !\n", tag);
138 p = _ALIGN(p + strlen(pathp) + 1, 4);
139 if ((*pathp) == '/') {
141 for (lp = NULL, np = pathp; *np; np++)
147 rc = it(p, pathp, depth, data);
155 unsigned long __init of_get_flat_dt_root(void)
157 unsigned long p = ((unsigned long)initial_boot_params) +
158 initial_boot_params->off_dt_struct;
160 while(*((u32 *)p) == OF_DT_NOP)
162 BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
164 return _ALIGN(p + strlen((char *)p) + 1, 4);
168 * This function can be used within scan_flattened_dt callback to get
169 * access to properties
171 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
174 unsigned long p = node;
177 u32 tag = *((u32 *)p);
182 if (tag == OF_DT_NOP)
184 if (tag != OF_DT_PROP)
188 noff = *((u32 *)(p + 4));
190 if (initial_boot_params->version < 0x10)
191 p = _ALIGN(p, sz >= 8 ? 8 : 4);
193 nstr = find_flat_dt_string(noff);
195 printk(KERN_WARNING "Can't find property index"
199 if (strcmp(name, nstr) == 0) {
209 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
212 unsigned long cplen, l;
214 cp = of_get_flat_dt_prop(node, "compatible", &cplen);
218 if (strncasecmp(cp, compat, strlen(compat)) == 0)
228 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
233 *mem = _ALIGN(*mem, align);
240 static unsigned long __init unflatten_dt_node(unsigned long mem,
242 struct device_node *dad,
243 struct device_node ***allnextpp,
244 unsigned long fpsize)
246 struct device_node *np;
247 struct property *pp, **prev_pp = NULL;
250 unsigned int l, allocl;
254 tag = *((u32 *)(*p));
255 if (tag != OF_DT_BEGIN_NODE) {
256 printk("Weird tag at start of node: %x\n", tag);
261 l = allocl = strlen(pathp) + 1;
262 *p = _ALIGN(*p + l, 4);
264 /* version 0x10 has a more compact unit name here instead of the full
265 * path. we accumulate the full path size using "fpsize", we'll rebuild
266 * it later. We detect this because the first character of the name is
269 if ((*pathp) != '/') {
272 /* root node: special case. fpsize accounts for path
273 * plus terminating zero. root node only has '/', so
274 * fpsize should be 2, but we want to avoid the first
275 * level nodes to have two '/' so we use fpsize 1 here
280 /* account for '/' and path size minus terminal 0
289 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
290 __alignof__(struct device_node));
292 memset(np, 0, sizeof(*np));
293 np->full_name = ((char*)np) + sizeof(struct device_node);
295 char *p = np->full_name;
296 /* rebuild full path for new format */
297 if (dad && dad->parent) {
298 strcpy(p, dad->full_name);
300 if ((strlen(p) + l + 1) != allocl) {
301 DBG("%s: p: %d, l: %d, a: %d\n",
302 pathp, (int)strlen(p), l, allocl);
310 memcpy(np->full_name, pathp, l);
311 prev_pp = &np->properties;
313 *allnextpp = &np->allnext;
316 /* we temporarily use the next field as `last_child'*/
320 dad->next->sibling = np;
323 kref_init(&np->kref);
329 tag = *((u32 *)(*p));
330 if (tag == OF_DT_NOP) {
334 if (tag != OF_DT_PROP)
338 noff = *((u32 *)((*p) + 4));
340 if (initial_boot_params->version < 0x10)
341 *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
343 pname = find_flat_dt_string(noff);
345 printk("Can't find property name in list !\n");
348 if (strcmp(pname, "name") == 0)
350 l = strlen(pname) + 1;
351 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
352 __alignof__(struct property));
354 if (strcmp(pname, "linux,phandle") == 0) {
355 np->node = *((u32 *)*p);
356 if (np->linux_phandle == 0)
357 np->linux_phandle = np->node;
359 if (strcmp(pname, "ibm,phandle") == 0)
360 np->linux_phandle = *((u32 *)*p);
363 pp->value = (void *)*p;
367 *p = _ALIGN((*p) + sz, 4);
369 /* with version 0x10 we may not have the name property, recreate
370 * it here from the unit name if absent
373 char *p = pathp, *ps = pathp, *pa = NULL;
386 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
387 __alignof__(struct property));
394 memcpy(pp->value, ps, sz - 1);
395 ((char *)pp->value)[sz - 1] = 0;
396 DBG("fixed up name for %s -> %s\n", pathp,
402 np->name = of_get_property(np, "name", NULL);
403 np->type = of_get_property(np, "device_type", NULL);
410 while (tag == OF_DT_BEGIN_NODE) {
411 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
412 tag = *((u32 *)(*p));
414 if (tag != OF_DT_END_NODE) {
415 printk("Weird tag at end of node: %x\n", tag);
422 static int __init early_parse_mem(char *p)
427 memory_limit = PAGE_ALIGN(memparse(p, &p));
428 DBG("memory limit = 0x%lx\n", memory_limit);
432 early_param("mem", early_parse_mem);
435 * The device tree may be allocated below our memory limit, or inside the
436 * crash kernel region for kdump. If so, move it out now.
438 static void move_device_tree(void)
440 unsigned long start, size;
443 DBG("-> move_device_tree\n");
445 start = __pa(initial_boot_params);
446 size = initial_boot_params->totalsize;
448 if ((memory_limit && (start + size) > memory_limit) ||
449 overlaps_crashkernel(start, size)) {
450 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
451 memcpy(p, initial_boot_params, size);
452 initial_boot_params = (struct boot_param_header *)p;
453 DBG("Moved device tree to 0x%p\n", p);
456 DBG("<- move_device_tree\n");
460 * unflattens the device-tree passed by the firmware, creating the
461 * tree of struct device_node. It also fills the "name" and "type"
462 * pointers of the nodes so the normal device-tree walking functions
463 * can be used (this used to be done by finish_device_tree)
465 void __init unflatten_device_tree(void)
467 unsigned long start, mem, size;
468 struct device_node **allnextp = &allnodes;
470 DBG(" -> unflatten_device_tree()\n");
472 /* First pass, scan for size */
473 start = ((unsigned long)initial_boot_params) +
474 initial_boot_params->off_dt_struct;
475 size = unflatten_dt_node(0, &start, NULL, NULL, 0);
476 size = (size | 3) + 1;
478 DBG(" size is %lx, allocating...\n", size);
480 /* Allocate memory for the expanded device tree */
481 mem = lmb_alloc(size + 4, __alignof__(struct device_node));
482 mem = (unsigned long) __va(mem);
484 ((u32 *)mem)[size / 4] = 0xdeadbeef;
486 DBG(" unflattening %lx...\n", mem);
488 /* Second pass, do actual unflattening */
489 start = ((unsigned long)initial_boot_params) +
490 initial_boot_params->off_dt_struct;
491 unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
492 if (*((u32 *)start) != OF_DT_END)
493 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
494 if (((u32 *)mem)[size / 4] != 0xdeadbeef)
495 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
496 ((u32 *)mem)[size / 4] );
499 /* Get pointer to OF "/chosen" node for use everywhere */
500 of_chosen = of_find_node_by_path("/chosen");
501 if (of_chosen == NULL)
502 of_chosen = of_find_node_by_path("/chosen@0");
504 DBG(" <- unflatten_device_tree()\n");
508 * ibm,pa-features is a per-cpu property that contains a string of
509 * attribute descriptors, each of which has a 2 byte header plus up
510 * to 254 bytes worth of processor attribute bits. First header
511 * byte specifies the number of bytes following the header.
512 * Second header byte is an "attribute-specifier" type, of which
513 * zero is the only currently-defined value.
514 * Implementation: Pass in the byte and bit offset for the feature
515 * that we are interested in. The function will return -1 if the
516 * pa-features property is missing, or a 1/0 to indicate if the feature
517 * is supported/not supported. Note that the bit numbers are
518 * big-endian to match the definition in PAPR.
520 static struct ibm_pa_feature {
521 unsigned long cpu_features; /* CPU_FTR_xxx bit */
522 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
523 unsigned char pabyte; /* byte number in ibm,pa-features */
524 unsigned char pabit; /* bit number (big-endian) */
525 unsigned char invert; /* if 1, pa bit set => clear feature */
526 } ibm_pa_features[] __initdata = {
527 {0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
528 {0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
529 {CPU_FTR_SLB, 0, 0, 2, 0},
530 {CPU_FTR_CTRL, 0, 0, 3, 0},
531 {CPU_FTR_NOEXECUTE, 0, 0, 6, 0},
532 {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1},
534 /* put this back once we know how to test if firmware does 64k IO */
535 {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
537 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
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)
545 unsigned long i, len, bit;
547 /* find descriptor with type == 0 */
553 return; /* descriptor 0 not found */
560 /* loop over bits we know about */
561 for (i = 0; i < ft_size; ++i, ++fp) {
562 if (fp->pabyte >= ftrs[0])
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;
569 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
570 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
575 static void __init check_cpu_pa_features(unsigned long node)
577 unsigned char *pa_ftrs;
578 unsigned long tablelen;
580 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
584 scan_features(node, pa_ftrs, tablelen,
585 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
588 static struct feature_property {
591 unsigned long cpu_feature;
592 unsigned long cpu_user_ftr;
593 } feature_properties[] __initdata = {
594 #ifdef CONFIG_ALTIVEC
595 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
596 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
597 #endif /* CONFIG_ALTIVEC */
599 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
600 {"ibm,purr", 1, CPU_FTR_PURR, 0},
601 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
602 #endif /* CONFIG_PPC64 */
605 static void __init check_cpu_feature_properties(unsigned long node)
608 struct feature_property *fp = feature_properties;
611 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
612 prop = of_get_flat_dt_prop(node, fp->name, NULL);
613 if (prop && *prop >= fp->min_value) {
614 cur_cpu_spec->cpu_features |= fp->cpu_feature;
615 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
620 static int __init early_init_dt_scan_cpus(unsigned long node,
621 const char *uname, int depth,
624 static int logical_cpuid = 0;
625 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
632 /* We are scanning "cpu" nodes only */
633 if (type == NULL || strcmp(type, "cpu") != 0)
636 /* Get physical cpuid */
637 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
639 nthreads = len / sizeof(int);
641 intserv = of_get_flat_dt_prop(node, "reg", NULL);
646 * Now see if any of these threads match our boot cpu.
647 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
649 for (i = 0; i < nthreads; i++) {
651 * version 2 of the kexec param format adds the phys cpuid of
654 if (initial_boot_params && initial_boot_params->version >= 2) {
656 initial_boot_params->boot_cpuid_phys) {
662 * Check if it's the boot-cpu, set it's hw index now,
663 * unfortunately this format did not support booting
664 * off secondary threads.
666 if (of_get_flat_dt_prop(node,
667 "linux,boot-cpu", NULL) != NULL) {
674 /* logical cpu id is always 0 on UP kernels */
680 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
682 boot_cpuid = logical_cpuid;
683 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
686 * PAPR defines "logical" PVR values for cpus that
687 * meet various levels of the architecture:
688 * 0x0f000001 Architecture version 2.04
689 * 0x0f000002 Architecture version 2.05
690 * If the cpu-version property in the cpu node contains
691 * such a value, we call identify_cpu again with the
692 * logical PVR value in order to use the cpu feature
693 * bits appropriate for the architecture level.
695 * A POWER6 partition in "POWER6 architected" mode
696 * uses the 0x0f000002 PVR value; in POWER5+ mode
697 * it uses 0x0f000001.
699 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
700 if (prop && (*prop & 0xff000000) == 0x0f000000)
701 identify_cpu(0, *prop);
704 check_cpu_feature_properties(node);
705 check_cpu_pa_features(node);
707 #ifdef CONFIG_PPC_PSERIES
709 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
711 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
717 #ifdef CONFIG_BLK_DEV_INITRD
718 static void __init early_init_dt_check_for_initrd(unsigned long node)
723 DBG("Looking for initrd properties... ");
725 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
727 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
729 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
731 initrd_end = (unsigned long)
732 __va(of_read_ulong(prop, l/4));
733 initrd_below_start_ok = 1;
739 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start, initrd_end);
742 static inline void early_init_dt_check_for_initrd(unsigned long node)
745 #endif /* CONFIG_BLK_DEV_INITRD */
747 static int __init early_init_dt_scan_chosen(unsigned long node,
748 const char *uname, int depth, void *data)
750 unsigned long *lprop;
754 DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
757 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
761 /* check if iommu is forced on or off */
762 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
764 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
768 /* mem=x on the command line is the preferred mechanism */
769 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
771 memory_limit = *lprop;
774 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
776 tce_alloc_start = *lprop;
777 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
779 tce_alloc_end = *lprop;
783 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
785 crashk_res.start = *lprop;
787 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
789 crashk_res.end = crashk_res.start + *lprop - 1;
792 early_init_dt_check_for_initrd(node);
794 /* Retreive command line */
795 p = of_get_flat_dt_prop(node, "bootargs", &l);
796 if (p != NULL && l > 0)
797 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
799 #ifdef CONFIG_CMDLINE
800 if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
801 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
802 #endif /* CONFIG_CMDLINE */
804 DBG("Command line is: %s\n", cmd_line);
810 static int __init early_init_dt_scan_root(unsigned long node,
811 const char *uname, int depth, void *data)
818 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
819 dt_root_size_cells = (prop == NULL) ? 1 : *prop;
820 DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
822 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
823 dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
824 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
830 static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
835 return of_read_ulong(p, s);
838 #ifdef CONFIG_PPC_PSERIES
840 * Interpret the ibm,dynamic-memory property in the
841 * /ibm,dynamic-reconfiguration-memory node.
842 * This contains a list of memory blocks along with NUMA affinity
845 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
849 unsigned long base, size, lmb_size, flags;
851 ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
852 if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
854 lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
856 dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
857 if (dm == NULL || l < sizeof(cell_t))
860 n = *dm++; /* number of entries */
861 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
864 for (; n != 0; --n) {
865 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
867 /* skip DRC index, pad, assoc. list index, flags */
869 /* skip this block if the reserved bit is set in flags (0x80)
870 or if the block is not assigned to this partition (0x8) */
871 if ((flags & 0x80) || !(flags & 0x8))
875 if (base >= 0x80000000ul)
877 if ((base + size) > 0x80000000ul)
878 size = 0x80000000ul - base;
886 #define early_init_dt_scan_drconf_memory(node) 0
887 #endif /* CONFIG_PPC_PSERIES */
889 static int __init early_init_dt_scan_memory(unsigned long node,
890 const char *uname, int depth, void *data)
892 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
896 /* Look for the ibm,dynamic-reconfiguration-memory node */
898 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
899 return early_init_dt_scan_drconf_memory(node);
901 /* We are scanning "memory" nodes only */
904 * The longtrail doesn't have a device_type on the
905 * /memory node, so look for the node called /memory@0.
907 if (depth != 1 || strcmp(uname, "memory@0") != 0)
909 } else if (strcmp(type, "memory") != 0)
912 reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
914 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
918 endp = reg + (l / sizeof(cell_t));
920 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
921 uname, l, reg[0], reg[1], reg[2], reg[3]);
923 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
924 unsigned long base, size;
926 base = dt_mem_next_cell(dt_root_addr_cells, ®);
927 size = dt_mem_next_cell(dt_root_size_cells, ®);
931 DBG(" - %lx , %lx\n", base, size);
934 if (base >= 0x80000000ul)
936 if ((base + size) > 0x80000000ul)
937 size = 0x80000000ul - base;
945 static void __init early_reserve_mem(void)
949 unsigned long self_base;
950 unsigned long self_size;
952 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
953 initial_boot_params->off_mem_rsvmap);
955 /* before we do anything, lets reserve the dt blob */
956 self_base = __pa((unsigned long)initial_boot_params);
957 self_size = initial_boot_params->totalsize;
958 lmb_reserve(self_base, self_size);
960 #ifdef CONFIG_BLK_DEV_INITRD
961 /* then reserve the initrd, if any */
962 if (initrd_start && (initrd_end > initrd_start))
963 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
964 #endif /* CONFIG_BLK_DEV_INITRD */
968 * Handle the case where we might be booting from an old kexec
969 * image that setup the mem_rsvmap as pairs of 32-bit values
971 if (*reserve_map > 0xffffffffull) {
972 u32 base_32, size_32;
973 u32 *reserve_map_32 = (u32 *)reserve_map;
976 base_32 = *(reserve_map_32++);
977 size_32 = *(reserve_map_32++);
980 /* skip if the reservation is for the blob */
981 if (base_32 == self_base && size_32 == self_size)
983 DBG("reserving: %x -> %x\n", base_32, size_32);
984 lmb_reserve(base_32, size_32);
990 base = *(reserve_map++);
991 size = *(reserve_map++);
994 DBG("reserving: %llx -> %llx\n", base, size);
995 lmb_reserve(base, size);
999 DBG("memory reserved, lmbs :\n");
1004 void __init early_init_devtree(void *params)
1006 DBG(" -> early_init_devtree(%p)\n", params);
1008 /* Setup flat device-tree pointer */
1009 initial_boot_params = params;
1011 #ifdef CONFIG_PPC_RTAS
1012 /* Some machines might need RTAS info for debugging, grab it now. */
1013 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1016 /* Retrieve various informations from the /chosen node of the
1017 * device-tree, including the platform type, initrd location and
1018 * size, TCE reserve, and more ...
1020 of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1022 /* Scan memory nodes and rebuild LMBs */
1024 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1025 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1027 /* Save command line for /proc/cmdline and then parse parameters */
1028 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1029 parse_early_param();
1031 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1032 lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1033 reserve_kdump_trampoline();
1034 reserve_crashkernel();
1035 early_reserve_mem();
1037 lmb_enforce_memory_limit(memory_limit);
1040 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1042 /* We may need to relocate the flat tree, do it now.
1043 * FIXME .. and the initrd too? */
1046 DBG("Scanning CPUs ...\n");
1048 /* Retreive CPU related informations from the flat tree
1049 * (altivec support, boot CPU ID, ...)
1051 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1053 DBG(" <- early_init_devtree()\n");
1058 * Indicates whether the root node has a given value in its
1059 * compatible property.
1061 int machine_is_compatible(const char *compat)
1063 struct device_node *root;
1066 root = of_find_node_by_path("/");
1068 rc = of_device_is_compatible(root, compat);
1073 EXPORT_SYMBOL(machine_is_compatible);
1077 * New implementation of the OF "find" APIs, return a refcounted
1078 * object, call of_node_put() when done. The device tree and list
1079 * are protected by a rw_lock.
1081 * Note that property management will need some locking as well,
1082 * this isn't dealt with yet.
1087 * of_find_node_by_phandle - Find a node given a phandle
1088 * @handle: phandle of the node to find
1090 * Returns a node pointer with refcount incremented, use
1091 * of_node_put() on it when done.
1093 struct device_node *of_find_node_by_phandle(phandle handle)
1095 struct device_node *np;
1097 read_lock(&devtree_lock);
1098 for (np = allnodes; np != 0; np = np->allnext)
1099 if (np->linux_phandle == handle)
1102 read_unlock(&devtree_lock);
1105 EXPORT_SYMBOL(of_find_node_by_phandle);
1108 * of_find_all_nodes - Get next node in global list
1109 * @prev: Previous node or NULL to start iteration
1110 * of_node_put() will be called on it
1112 * Returns a node pointer with refcount incremented, use
1113 * of_node_put() on it when done.
1115 struct device_node *of_find_all_nodes(struct device_node *prev)
1117 struct device_node *np;
1119 read_lock(&devtree_lock);
1120 np = prev ? prev->allnext : allnodes;
1121 for (; np != 0; np = np->allnext)
1122 if (of_node_get(np))
1125 read_unlock(&devtree_lock);
1128 EXPORT_SYMBOL(of_find_all_nodes);
1131 * of_node_get - Increment refcount of a node
1132 * @node: Node to inc refcount, NULL is supported to
1133 * simplify writing of callers
1137 struct device_node *of_node_get(struct device_node *node)
1140 kref_get(&node->kref);
1143 EXPORT_SYMBOL(of_node_get);
1145 static inline struct device_node * kref_to_device_node(struct kref *kref)
1147 return container_of(kref, struct device_node, kref);
1151 * of_node_release - release a dynamically allocated node
1152 * @kref: kref element of the node to be released
1154 * In of_node_put() this function is passed to kref_put()
1155 * as the destructor.
1157 static void of_node_release(struct kref *kref)
1159 struct device_node *node = kref_to_device_node(kref);
1160 struct property *prop = node->properties;
1162 /* We should never be releasing nodes that haven't been detached. */
1163 if (!of_node_check_flag(node, OF_DETACHED)) {
1164 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1166 kref_init(&node->kref);
1170 if (!of_node_check_flag(node, OF_DYNAMIC))
1174 struct property *next = prop->next;
1181 prop = node->deadprops;
1182 node->deadprops = NULL;
1185 kfree(node->full_name);
1191 * of_node_put - Decrement refcount of a node
1192 * @node: Node to dec refcount, NULL is supported to
1193 * simplify writing of callers
1196 void of_node_put(struct device_node *node)
1199 kref_put(&node->kref, of_node_release);
1201 EXPORT_SYMBOL(of_node_put);
1204 * Plug a device node into the tree and global list.
1206 void of_attach_node(struct device_node *np)
1208 write_lock(&devtree_lock);
1209 np->sibling = np->parent->child;
1210 np->allnext = allnodes;
1211 np->parent->child = np;
1213 write_unlock(&devtree_lock);
1217 * "Unplug" a node from the device tree. The caller must hold
1218 * a reference to the node. The memory associated with the node
1219 * is not freed until its refcount goes to zero.
1221 void of_detach_node(const struct device_node *np)
1223 struct device_node *parent;
1225 write_lock(&devtree_lock);
1227 parent = np->parent;
1232 allnodes = np->allnext;
1234 struct device_node *prev;
1235 for (prev = allnodes;
1236 prev->allnext != np;
1237 prev = prev->allnext)
1239 prev->allnext = np->allnext;
1242 if (parent->child == np)
1243 parent->child = np->sibling;
1245 struct device_node *prevsib;
1246 for (prevsib = np->parent->child;
1247 prevsib->sibling != np;
1248 prevsib = prevsib->sibling)
1250 prevsib->sibling = np->sibling;
1253 of_node_set_flag(np, OF_DETACHED);
1256 write_unlock(&devtree_lock);
1259 #ifdef CONFIG_PPC_PSERIES
1261 * Fix up the uninitialized fields in a new device node:
1262 * name, type and pci-specific fields
1265 static int of_finish_dynamic_node(struct device_node *node)
1267 struct device_node *parent = of_get_parent(node);
1269 const phandle *ibm_phandle;
1271 node->name = of_get_property(node, "name", NULL);
1272 node->type = of_get_property(node, "device_type", NULL);
1275 node->name = "<NULL>";
1277 node->type = "<NULL>";
1284 /* We don't support that function on PowerMac, at least
1287 if (machine_is(powermac))
1290 /* fix up new node's linux_phandle field */
1291 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1292 node->linux_phandle = *ibm_phandle;
1295 of_node_put(parent);
1299 static int prom_reconfig_notifier(struct notifier_block *nb,
1300 unsigned long action, void *node)
1305 case PSERIES_RECONFIG_ADD:
1306 err = of_finish_dynamic_node(node);
1308 printk(KERN_ERR "finish_node returned %d\n", err);
1319 static struct notifier_block prom_reconfig_nb = {
1320 .notifier_call = prom_reconfig_notifier,
1321 .priority = 10, /* This one needs to run first */
1324 static int __init prom_reconfig_setup(void)
1326 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1328 __initcall(prom_reconfig_setup);
1332 * Add a property to a node
1334 int prom_add_property(struct device_node* np, struct property* prop)
1336 struct property **next;
1339 write_lock(&devtree_lock);
1340 next = &np->properties;
1342 if (strcmp(prop->name, (*next)->name) == 0) {
1343 /* duplicate ! don't insert it */
1344 write_unlock(&devtree_lock);
1347 next = &(*next)->next;
1350 write_unlock(&devtree_lock);
1352 #ifdef CONFIG_PROC_DEVICETREE
1353 /* try to add to proc as well if it was initialized */
1355 proc_device_tree_add_prop(np->pde, prop);
1356 #endif /* CONFIG_PROC_DEVICETREE */
1362 * Remove a property from a node. Note that we don't actually
1363 * remove it, since we have given out who-knows-how-many pointers
1364 * to the data using get-property. Instead we just move the property
1365 * to the "dead properties" list, so it won't be found any more.
1367 int prom_remove_property(struct device_node *np, struct property *prop)
1369 struct property **next;
1372 write_lock(&devtree_lock);
1373 next = &np->properties;
1375 if (*next == prop) {
1376 /* found the node */
1378 prop->next = np->deadprops;
1379 np->deadprops = prop;
1383 next = &(*next)->next;
1385 write_unlock(&devtree_lock);
1390 #ifdef CONFIG_PROC_DEVICETREE
1391 /* try to remove the proc node as well */
1393 proc_device_tree_remove_prop(np->pde, prop);
1394 #endif /* CONFIG_PROC_DEVICETREE */
1400 * Update a property in a node. Note that we don't actually
1401 * remove it, since we have given out who-knows-how-many pointers
1402 * to the data using get-property. Instead we just move the property
1403 * to the "dead properties" list, and add the new property to the
1406 int prom_update_property(struct device_node *np,
1407 struct property *newprop,
1408 struct property *oldprop)
1410 struct property **next;
1413 write_lock(&devtree_lock);
1414 next = &np->properties;
1416 if (*next == oldprop) {
1417 /* found the node */
1418 newprop->next = oldprop->next;
1420 oldprop->next = np->deadprops;
1421 np->deadprops = oldprop;
1425 next = &(*next)->next;
1427 write_unlock(&devtree_lock);
1432 #ifdef CONFIG_PROC_DEVICETREE
1433 /* try to add to proc as well if it was initialized */
1435 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1436 #endif /* CONFIG_PROC_DEVICETREE */
1442 /* Find the device node for a given logical cpu number, also returns the cpu
1443 * local thread number (index in ibm,interrupt-server#s) if relevant and
1444 * asked for (non NULL)
1446 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1449 struct device_node *np;
1451 hardid = get_hard_smp_processor_id(cpu);
1453 for_each_node_by_type(np, "cpu") {
1455 unsigned int plen, t;
1457 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1458 * fallback to "reg" property and assume no threads
1460 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1462 if (intserv == NULL) {
1463 const u32 *reg = of_get_property(np, "reg", NULL);
1466 if (*reg == hardid) {
1472 plen /= sizeof(u32);
1473 for (t = 0; t < plen; t++) {
1474 if (hardid == intserv[t]) {
1484 EXPORT_SYMBOL(of_get_cpu_node);
1486 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1487 static struct debugfs_blob_wrapper flat_dt_blob;
1489 static int __init export_flat_device_tree(void)
1493 flat_dt_blob.data = initial_boot_params;
1494 flat_dt_blob.size = initial_boot_params->totalsize;
1496 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1497 powerpc_debugfs_root, &flat_dt_blob);
1503 __initcall(export_flat_device_tree);