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>
57 #define DBG(fmt...) printk(KERN_ERR fmt)
63 static int __initdata dt_root_addr_cells;
64 static int __initdata dt_root_size_cells;
67 int __initdata iommu_is_off;
68 int __initdata iommu_force_on;
69 unsigned long tce_alloc_start, tce_alloc_end;
75 static struct boot_param_header *initial_boot_params __initdata;
77 struct boot_param_header *initial_boot_params;
80 extern struct device_node *allnodes; /* temporary while merging */
82 extern rwlock_t devtree_lock; /* temporary while merging */
84 /* export that to outside world */
85 struct device_node *of_chosen;
87 static inline char *find_flat_dt_string(u32 offset)
89 return ((char *)initial_boot_params) +
90 initial_boot_params->off_dt_strings + offset;
94 * This function is used to scan the flattened device-tree, it is
95 * used to extract the memory informations at boot before we can
98 int __init of_scan_flat_dt(int (*it)(unsigned long node,
99 const char *uname, int depth,
103 unsigned long p = ((unsigned long)initial_boot_params) +
104 initial_boot_params->off_dt_struct;
109 u32 tag = *((u32 *)p);
113 if (tag == OF_DT_END_NODE) {
117 if (tag == OF_DT_NOP)
119 if (tag == OF_DT_END)
121 if (tag == OF_DT_PROP) {
122 u32 sz = *((u32 *)p);
124 if (initial_boot_params->version < 0x10)
125 p = _ALIGN(p, sz >= 8 ? 8 : 4);
130 if (tag != OF_DT_BEGIN_NODE) {
131 printk(KERN_WARNING "Invalid tag %x scanning flattened"
132 " device tree !\n", tag);
137 p = _ALIGN(p + strlen(pathp) + 1, 4);
138 if ((*pathp) == '/') {
140 for (lp = NULL, np = pathp; *np; np++)
146 rc = it(p, pathp, depth, data);
154 unsigned long __init of_get_flat_dt_root(void)
156 unsigned long p = ((unsigned long)initial_boot_params) +
157 initial_boot_params->off_dt_struct;
159 while(*((u32 *)p) == OF_DT_NOP)
161 BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
163 return _ALIGN(p + strlen((char *)p) + 1, 4);
167 * This function can be used within scan_flattened_dt callback to get
168 * access to properties
170 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
173 unsigned long p = node;
176 u32 tag = *((u32 *)p);
181 if (tag == OF_DT_NOP)
183 if (tag != OF_DT_PROP)
187 noff = *((u32 *)(p + 4));
189 if (initial_boot_params->version < 0x10)
190 p = _ALIGN(p, sz >= 8 ? 8 : 4);
192 nstr = find_flat_dt_string(noff);
194 printk(KERN_WARNING "Can't find property index"
198 if (strcmp(name, nstr) == 0) {
208 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
211 unsigned long cplen, l;
213 cp = of_get_flat_dt_prop(node, "compatible", &cplen);
217 if (strncasecmp(cp, compat, strlen(compat)) == 0)
227 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
232 *mem = _ALIGN(*mem, align);
239 static unsigned long __init unflatten_dt_node(unsigned long mem,
241 struct device_node *dad,
242 struct device_node ***allnextpp,
243 unsigned long fpsize)
245 struct device_node *np;
246 struct property *pp, **prev_pp = NULL;
249 unsigned int l, allocl;
253 tag = *((u32 *)(*p));
254 if (tag != OF_DT_BEGIN_NODE) {
255 printk("Weird tag at start of node: %x\n", tag);
260 l = allocl = strlen(pathp) + 1;
261 *p = _ALIGN(*p + l, 4);
263 /* version 0x10 has a more compact unit name here instead of the full
264 * path. we accumulate the full path size using "fpsize", we'll rebuild
265 * it later. We detect this because the first character of the name is
268 if ((*pathp) != '/') {
271 /* root node: special case. fpsize accounts for path
272 * plus terminating zero. root node only has '/', so
273 * fpsize should be 2, but we want to avoid the first
274 * level nodes to have two '/' so we use fpsize 1 here
279 /* account for '/' and path size minus terminal 0
288 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
289 __alignof__(struct device_node));
291 memset(np, 0, sizeof(*np));
292 np->full_name = ((char*)np) + sizeof(struct device_node);
294 char *p = np->full_name;
295 /* rebuild full path for new format */
296 if (dad && dad->parent) {
297 strcpy(p, dad->full_name);
299 if ((strlen(p) + l + 1) != allocl) {
300 DBG("%s: p: %d, l: %d, a: %d\n",
301 pathp, (int)strlen(p), l, allocl);
309 memcpy(np->full_name, pathp, l);
310 prev_pp = &np->properties;
312 *allnextpp = &np->allnext;
315 /* we temporarily use the next field as `last_child'*/
319 dad->next->sibling = np;
322 kref_init(&np->kref);
328 tag = *((u32 *)(*p));
329 if (tag == OF_DT_NOP) {
333 if (tag != OF_DT_PROP)
337 noff = *((u32 *)((*p) + 4));
339 if (initial_boot_params->version < 0x10)
340 *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
342 pname = find_flat_dt_string(noff);
344 printk("Can't find property name in list !\n");
347 if (strcmp(pname, "name") == 0)
349 l = strlen(pname) + 1;
350 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
351 __alignof__(struct property));
353 if (strcmp(pname, "linux,phandle") == 0) {
354 np->node = *((u32 *)*p);
355 if (np->linux_phandle == 0)
356 np->linux_phandle = np->node;
358 if (strcmp(pname, "ibm,phandle") == 0)
359 np->linux_phandle = *((u32 *)*p);
362 pp->value = (void *)*p;
366 *p = _ALIGN((*p) + sz, 4);
368 /* with version 0x10 we may not have the name property, recreate
369 * it here from the unit name if absent
372 char *p = pathp, *ps = pathp, *pa = NULL;
385 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
386 __alignof__(struct property));
393 memcpy(pp->value, ps, sz - 1);
394 ((char *)pp->value)[sz - 1] = 0;
395 DBG("fixed up name for %s -> %s\n", pathp,
401 np->name = of_get_property(np, "name", NULL);
402 np->type = of_get_property(np, "device_type", NULL);
409 while (tag == OF_DT_BEGIN_NODE) {
410 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
411 tag = *((u32 *)(*p));
413 if (tag != OF_DT_END_NODE) {
414 printk("Weird tag at end of node: %x\n", tag);
421 static int __init early_parse_mem(char *p)
426 memory_limit = PAGE_ALIGN(memparse(p, &p));
427 DBG("memory limit = 0x%lx\n", memory_limit);
431 early_param("mem", early_parse_mem);
434 * move_device_tree - move tree to an unused area, if needed.
436 * The device tree may be allocated beyond our memory limit, or inside the
437 * crash kernel region for kdump. If so, move it out of the way.
439 static void move_device_tree(void)
441 unsigned long start, size;
444 DBG("-> move_device_tree\n");
446 start = __pa(initial_boot_params);
447 size = initial_boot_params->totalsize;
449 if ((memory_limit && (start + size) > memory_limit) ||
450 overlaps_crashkernel(start, size)) {
451 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
452 memcpy(p, initial_boot_params, size);
453 initial_boot_params = (struct boot_param_header *)p;
454 DBG("Moved device tree to 0x%p\n", p);
457 DBG("<- move_device_tree\n");
461 * unflattens the device-tree passed by the firmware, creating the
462 * tree of struct device_node. It also fills the "name" and "type"
463 * pointers of the nodes so the normal device-tree walking functions
464 * can be used (this used to be done by finish_device_tree)
466 void __init unflatten_device_tree(void)
468 unsigned long start, mem, size;
469 struct device_node **allnextp = &allnodes;
471 DBG(" -> unflatten_device_tree()\n");
473 /* First pass, scan for size */
474 start = ((unsigned long)initial_boot_params) +
475 initial_boot_params->off_dt_struct;
476 size = unflatten_dt_node(0, &start, NULL, NULL, 0);
477 size = (size | 3) + 1;
479 DBG(" size is %lx, allocating...\n", size);
481 /* Allocate memory for the expanded device tree */
482 mem = lmb_alloc(size + 4, __alignof__(struct device_node));
483 mem = (unsigned long) __va(mem);
485 ((u32 *)mem)[size / 4] = 0xdeadbeef;
487 DBG(" unflattening %lx...\n", mem);
489 /* Second pass, do actual unflattening */
490 start = ((unsigned long)initial_boot_params) +
491 initial_boot_params->off_dt_struct;
492 unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
493 if (*((u32 *)start) != OF_DT_END)
494 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
495 if (((u32 *)mem)[size / 4] != 0xdeadbeef)
496 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
497 ((u32 *)mem)[size / 4] );
500 /* Get pointer to OF "/chosen" node for use everywhere */
501 of_chosen = of_find_node_by_path("/chosen");
502 if (of_chosen == NULL)
503 of_chosen = of_find_node_by_path("/chosen@0");
505 DBG(" <- unflatten_device_tree()\n");
509 * ibm,pa-features is a per-cpu property that contains a string of
510 * attribute descriptors, each of which has a 2 byte header plus up
511 * to 254 bytes worth of processor attribute bits. First header
512 * byte specifies the number of bytes following the header.
513 * Second header byte is an "attribute-specifier" type, of which
514 * zero is the only currently-defined value.
515 * Implementation: Pass in the byte and bit offset for the feature
516 * that we are interested in. The function will return -1 if the
517 * pa-features property is missing, or a 1/0 to indicate if the feature
518 * is supported/not supported. Note that the bit numbers are
519 * big-endian to match the definition in PAPR.
521 static struct ibm_pa_feature {
522 unsigned long cpu_features; /* CPU_FTR_xxx bit */
523 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
524 unsigned char pabyte; /* byte number in ibm,pa-features */
525 unsigned char pabit; /* bit number (big-endian) */
526 unsigned char invert; /* if 1, pa bit set => clear feature */
527 } ibm_pa_features[] __initdata = {
528 {0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
529 {0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
530 {CPU_FTR_SLB, 0, 0, 2, 0},
531 {CPU_FTR_CTRL, 0, 0, 3, 0},
532 {CPU_FTR_NOEXECUTE, 0, 0, 6, 0},
533 {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1},
534 {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
535 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
538 static void __init scan_features(unsigned long node, unsigned char *ftrs,
539 unsigned long tablelen,
540 struct ibm_pa_feature *fp,
541 unsigned long ft_size)
543 unsigned long i, len, bit;
545 /* find descriptor with type == 0 */
551 return; /* descriptor 0 not found */
558 /* loop over bits we know about */
559 for (i = 0; i < ft_size; ++i, ++fp) {
560 if (fp->pabyte >= ftrs[0])
562 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
563 if (bit ^ fp->invert) {
564 cur_cpu_spec->cpu_features |= fp->cpu_features;
565 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
567 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
568 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
573 static void __init check_cpu_pa_features(unsigned long node)
575 unsigned char *pa_ftrs;
576 unsigned long tablelen;
578 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
582 scan_features(node, pa_ftrs, tablelen,
583 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
587 static void __init check_cpu_slb_size(unsigned long node)
591 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
592 if (slb_size_ptr != NULL) {
593 mmu_slb_size = *slb_size_ptr;
597 #define check_cpu_slb_size(node) do { } while(0)
600 static struct feature_property {
603 unsigned long cpu_feature;
604 unsigned long cpu_user_ftr;
605 } feature_properties[] __initdata = {
606 #ifdef CONFIG_ALTIVEC
607 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
608 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
609 #endif /* CONFIG_ALTIVEC */
611 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
612 {"ibm,purr", 1, CPU_FTR_PURR, 0},
613 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
614 #endif /* CONFIG_PPC64 */
617 static void __init check_cpu_feature_properties(unsigned long node)
620 struct feature_property *fp = feature_properties;
623 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
624 prop = of_get_flat_dt_prop(node, fp->name, NULL);
625 if (prop && *prop >= fp->min_value) {
626 cur_cpu_spec->cpu_features |= fp->cpu_feature;
627 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
632 static int __init early_init_dt_scan_cpus(unsigned long node,
633 const char *uname, int depth,
636 static int logical_cpuid = 0;
637 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
644 /* We are scanning "cpu" nodes only */
645 if (type == NULL || strcmp(type, "cpu") != 0)
648 /* Get physical cpuid */
649 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
651 nthreads = len / sizeof(int);
653 intserv = of_get_flat_dt_prop(node, "reg", NULL);
658 * Now see if any of these threads match our boot cpu.
659 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
661 for (i = 0; i < nthreads; i++) {
663 * version 2 of the kexec param format adds the phys cpuid of
666 if (initial_boot_params && initial_boot_params->version >= 2) {
668 initial_boot_params->boot_cpuid_phys) {
674 * Check if it's the boot-cpu, set it's hw index now,
675 * unfortunately this format did not support booting
676 * off secondary threads.
678 if (of_get_flat_dt_prop(node,
679 "linux,boot-cpu", NULL) != NULL) {
686 /* logical cpu id is always 0 on UP kernels */
692 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
694 boot_cpuid = logical_cpuid;
695 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
698 * PAPR defines "logical" PVR values for cpus that
699 * meet various levels of the architecture:
700 * 0x0f000001 Architecture version 2.04
701 * 0x0f000002 Architecture version 2.05
702 * If the cpu-version property in the cpu node contains
703 * such a value, we call identify_cpu again with the
704 * logical PVR value in order to use the cpu feature
705 * bits appropriate for the architecture level.
707 * A POWER6 partition in "POWER6 architected" mode
708 * uses the 0x0f000002 PVR value; in POWER5+ mode
709 * it uses 0x0f000001.
711 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
712 if (prop && (*prop & 0xff000000) == 0x0f000000)
713 identify_cpu(0, *prop);
714 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
716 * Since 440GR(x)/440EP(x) processors have the same pvr,
717 * we check the node path and set bit 28 in the cur_cpu_spec
718 * pvr for EP(x) processor version. This bit is always 0 in
719 * the "real" pvr. Then we call identify_cpu again with
720 * the new logical pvr to enable FPU support.
722 if (strstr(uname, "440EP")) {
723 identify_cpu(0, cur_cpu_spec->pvr_value | 0x8);
728 check_cpu_feature_properties(node);
729 check_cpu_pa_features(node);
730 check_cpu_slb_size(node);
732 #ifdef CONFIG_PPC_PSERIES
734 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
736 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
742 #ifdef CONFIG_BLK_DEV_INITRD
743 static void __init early_init_dt_check_for_initrd(unsigned long node)
748 DBG("Looking for initrd properties... ");
750 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
752 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
754 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
756 initrd_end = (unsigned long)
757 __va(of_read_ulong(prop, l/4));
758 initrd_below_start_ok = 1;
764 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start, initrd_end);
767 static inline void early_init_dt_check_for_initrd(unsigned long node)
770 #endif /* CONFIG_BLK_DEV_INITRD */
772 static int __init early_init_dt_scan_chosen(unsigned long node,
773 const char *uname, int depth, void *data)
775 unsigned long *lprop;
779 DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
782 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
786 /* check if iommu is forced on or off */
787 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
789 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
793 /* mem=x on the command line is the preferred mechanism */
794 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
796 memory_limit = *lprop;
799 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
801 tce_alloc_start = *lprop;
802 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
804 tce_alloc_end = *lprop;
808 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
810 crashk_res.start = *lprop;
812 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
814 crashk_res.end = crashk_res.start + *lprop - 1;
817 early_init_dt_check_for_initrd(node);
819 /* Retreive command line */
820 p = of_get_flat_dt_prop(node, "bootargs", &l);
821 if (p != NULL && l > 0)
822 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
824 #ifdef CONFIG_CMDLINE
825 if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
826 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
827 #endif /* CONFIG_CMDLINE */
829 DBG("Command line is: %s\n", cmd_line);
835 static int __init early_init_dt_scan_root(unsigned long node,
836 const char *uname, int depth, void *data)
843 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
844 dt_root_size_cells = (prop == NULL) ? 1 : *prop;
845 DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
847 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
848 dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
849 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
855 static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
860 return of_read_ulong(p, s);
863 #ifdef CONFIG_PPC_PSERIES
865 * Interpret the ibm,dynamic-memory property in the
866 * /ibm,dynamic-reconfiguration-memory node.
867 * This contains a list of memory blocks along with NUMA affinity
870 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
874 unsigned long base, size, lmb_size, flags;
876 ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
877 if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
879 lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
881 dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
882 if (dm == NULL || l < sizeof(cell_t))
885 n = *dm++; /* number of entries */
886 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
889 for (; n != 0; --n) {
890 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
892 /* skip DRC index, pad, assoc. list index, flags */
894 /* skip this block if the reserved bit is set in flags (0x80)
895 or if the block is not assigned to this partition (0x8) */
896 if ((flags & 0x80) || !(flags & 0x8))
900 if (base >= 0x80000000ul)
902 if ((base + size) > 0x80000000ul)
903 size = 0x80000000ul - base;
911 #define early_init_dt_scan_drconf_memory(node) 0
912 #endif /* CONFIG_PPC_PSERIES */
914 static int __init early_init_dt_scan_memory(unsigned long node,
915 const char *uname, int depth, void *data)
917 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
921 /* Look for the ibm,dynamic-reconfiguration-memory node */
923 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
924 return early_init_dt_scan_drconf_memory(node);
926 /* We are scanning "memory" nodes only */
929 * The longtrail doesn't have a device_type on the
930 * /memory node, so look for the node called /memory@0.
932 if (depth != 1 || strcmp(uname, "memory@0") != 0)
934 } else if (strcmp(type, "memory") != 0)
937 reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
939 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
943 endp = reg + (l / sizeof(cell_t));
945 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
946 uname, l, reg[0], reg[1], reg[2], reg[3]);
948 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
949 unsigned long base, size;
951 base = dt_mem_next_cell(dt_root_addr_cells, ®);
952 size = dt_mem_next_cell(dt_root_size_cells, ®);
956 DBG(" - %lx , %lx\n", base, size);
959 if (base >= 0x80000000ul)
961 if ((base + size) > 0x80000000ul)
962 size = 0x80000000ul - base;
970 static void __init early_reserve_mem(void)
974 unsigned long self_base;
975 unsigned long self_size;
977 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
978 initial_boot_params->off_mem_rsvmap);
980 /* before we do anything, lets reserve the dt blob */
981 self_base = __pa((unsigned long)initial_boot_params);
982 self_size = initial_boot_params->totalsize;
983 lmb_reserve(self_base, self_size);
985 #ifdef CONFIG_BLK_DEV_INITRD
986 /* then reserve the initrd, if any */
987 if (initrd_start && (initrd_end > initrd_start))
988 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
989 #endif /* CONFIG_BLK_DEV_INITRD */
993 * Handle the case where we might be booting from an old kexec
994 * image that setup the mem_rsvmap as pairs of 32-bit values
996 if (*reserve_map > 0xffffffffull) {
997 u32 base_32, size_32;
998 u32 *reserve_map_32 = (u32 *)reserve_map;
1001 base_32 = *(reserve_map_32++);
1002 size_32 = *(reserve_map_32++);
1005 /* skip if the reservation is for the blob */
1006 if (base_32 == self_base && size_32 == self_size)
1008 DBG("reserving: %x -> %x\n", base_32, size_32);
1009 lmb_reserve(base_32, size_32);
1015 base = *(reserve_map++);
1016 size = *(reserve_map++);
1019 DBG("reserving: %llx -> %llx\n", base, size);
1020 lmb_reserve(base, size);
1024 DBG("memory reserved, lmbs :\n");
1029 void __init early_init_devtree(void *params)
1031 DBG(" -> early_init_devtree(%p)\n", params);
1033 /* Setup flat device-tree pointer */
1034 initial_boot_params = params;
1036 #ifdef CONFIG_PPC_RTAS
1037 /* Some machines might need RTAS info for debugging, grab it now. */
1038 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1041 /* Retrieve various informations from the /chosen node of the
1042 * device-tree, including the platform type, initrd location and
1043 * size, TCE reserve, and more ...
1045 of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1047 /* Scan memory nodes and rebuild LMBs */
1049 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1050 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1052 /* Save command line for /proc/cmdline and then parse parameters */
1053 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1054 parse_early_param();
1056 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1057 lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1058 reserve_kdump_trampoline();
1059 reserve_crashkernel();
1060 early_reserve_mem();
1062 lmb_enforce_memory_limit(memory_limit);
1065 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1067 /* We may need to relocate the flat tree, do it now.
1068 * FIXME .. and the initrd too? */
1071 DBG("Scanning CPUs ...\n");
1073 /* Retreive CPU related informations from the flat tree
1074 * (altivec support, boot CPU ID, ...)
1076 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1078 DBG(" <- early_init_devtree()\n");
1083 * Indicates whether the root node has a given value in its
1084 * compatible property.
1086 int machine_is_compatible(const char *compat)
1088 struct device_node *root;
1091 root = of_find_node_by_path("/");
1093 rc = of_device_is_compatible(root, compat);
1098 EXPORT_SYMBOL(machine_is_compatible);
1102 * New implementation of the OF "find" APIs, return a refcounted
1103 * object, call of_node_put() when done. The device tree and list
1104 * are protected by a rw_lock.
1106 * Note that property management will need some locking as well,
1107 * this isn't dealt with yet.
1112 * of_find_node_by_phandle - Find a node given a phandle
1113 * @handle: phandle of the node to find
1115 * Returns a node pointer with refcount incremented, use
1116 * of_node_put() on it when done.
1118 struct device_node *of_find_node_by_phandle(phandle handle)
1120 struct device_node *np;
1122 read_lock(&devtree_lock);
1123 for (np = allnodes; np != 0; np = np->allnext)
1124 if (np->linux_phandle == handle)
1127 read_unlock(&devtree_lock);
1130 EXPORT_SYMBOL(of_find_node_by_phandle);
1133 * of_find_all_nodes - Get next node in global list
1134 * @prev: Previous node or NULL to start iteration
1135 * of_node_put() will be called on it
1137 * Returns a node pointer with refcount incremented, use
1138 * of_node_put() on it when done.
1140 struct device_node *of_find_all_nodes(struct device_node *prev)
1142 struct device_node *np;
1144 read_lock(&devtree_lock);
1145 np = prev ? prev->allnext : allnodes;
1146 for (; np != 0; np = np->allnext)
1147 if (of_node_get(np))
1150 read_unlock(&devtree_lock);
1153 EXPORT_SYMBOL(of_find_all_nodes);
1156 * of_node_get - Increment refcount of a node
1157 * @node: Node to inc refcount, NULL is supported to
1158 * simplify writing of callers
1162 struct device_node *of_node_get(struct device_node *node)
1165 kref_get(&node->kref);
1168 EXPORT_SYMBOL(of_node_get);
1170 static inline struct device_node * kref_to_device_node(struct kref *kref)
1172 return container_of(kref, struct device_node, kref);
1176 * of_node_release - release a dynamically allocated node
1177 * @kref: kref element of the node to be released
1179 * In of_node_put() this function is passed to kref_put()
1180 * as the destructor.
1182 static void of_node_release(struct kref *kref)
1184 struct device_node *node = kref_to_device_node(kref);
1185 struct property *prop = node->properties;
1187 /* We should never be releasing nodes that haven't been detached. */
1188 if (!of_node_check_flag(node, OF_DETACHED)) {
1189 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1191 kref_init(&node->kref);
1195 if (!of_node_check_flag(node, OF_DYNAMIC))
1199 struct property *next = prop->next;
1206 prop = node->deadprops;
1207 node->deadprops = NULL;
1210 kfree(node->full_name);
1216 * of_node_put - Decrement refcount of a node
1217 * @node: Node to dec refcount, NULL is supported to
1218 * simplify writing of callers
1221 void of_node_put(struct device_node *node)
1224 kref_put(&node->kref, of_node_release);
1226 EXPORT_SYMBOL(of_node_put);
1229 * Plug a device node into the tree and global list.
1231 void of_attach_node(struct device_node *np)
1233 write_lock(&devtree_lock);
1234 np->sibling = np->parent->child;
1235 np->allnext = allnodes;
1236 np->parent->child = np;
1238 write_unlock(&devtree_lock);
1242 * "Unplug" a node from the device tree. The caller must hold
1243 * a reference to the node. The memory associated with the node
1244 * is not freed until its refcount goes to zero.
1246 void of_detach_node(struct device_node *np)
1248 struct device_node *parent;
1250 write_lock(&devtree_lock);
1252 parent = np->parent;
1257 allnodes = np->allnext;
1259 struct device_node *prev;
1260 for (prev = allnodes;
1261 prev->allnext != np;
1262 prev = prev->allnext)
1264 prev->allnext = np->allnext;
1267 if (parent->child == np)
1268 parent->child = np->sibling;
1270 struct device_node *prevsib;
1271 for (prevsib = np->parent->child;
1272 prevsib->sibling != np;
1273 prevsib = prevsib->sibling)
1275 prevsib->sibling = np->sibling;
1278 of_node_set_flag(np, OF_DETACHED);
1281 write_unlock(&devtree_lock);
1284 #ifdef CONFIG_PPC_PSERIES
1286 * Fix up the uninitialized fields in a new device node:
1287 * name, type and pci-specific fields
1290 static int of_finish_dynamic_node(struct device_node *node)
1292 struct device_node *parent = of_get_parent(node);
1294 const phandle *ibm_phandle;
1296 node->name = of_get_property(node, "name", NULL);
1297 node->type = of_get_property(node, "device_type", NULL);
1300 node->name = "<NULL>";
1302 node->type = "<NULL>";
1309 /* We don't support that function on PowerMac, at least
1312 if (machine_is(powermac))
1315 /* fix up new node's linux_phandle field */
1316 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1317 node->linux_phandle = *ibm_phandle;
1320 of_node_put(parent);
1324 static int prom_reconfig_notifier(struct notifier_block *nb,
1325 unsigned long action, void *node)
1330 case PSERIES_RECONFIG_ADD:
1331 err = of_finish_dynamic_node(node);
1333 printk(KERN_ERR "finish_node returned %d\n", err);
1344 static struct notifier_block prom_reconfig_nb = {
1345 .notifier_call = prom_reconfig_notifier,
1346 .priority = 10, /* This one needs to run first */
1349 static int __init prom_reconfig_setup(void)
1351 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1353 __initcall(prom_reconfig_setup);
1357 * Add a property to a node
1359 int prom_add_property(struct device_node* np, struct property* prop)
1361 struct property **next;
1364 write_lock(&devtree_lock);
1365 next = &np->properties;
1367 if (strcmp(prop->name, (*next)->name) == 0) {
1368 /* duplicate ! don't insert it */
1369 write_unlock(&devtree_lock);
1372 next = &(*next)->next;
1375 write_unlock(&devtree_lock);
1377 #ifdef CONFIG_PROC_DEVICETREE
1378 /* try to add to proc as well if it was initialized */
1380 proc_device_tree_add_prop(np->pde, prop);
1381 #endif /* CONFIG_PROC_DEVICETREE */
1387 * Remove a property from a node. Note that we don't actually
1388 * remove it, since we have given out who-knows-how-many pointers
1389 * to the data using get-property. Instead we just move the property
1390 * to the "dead properties" list, so it won't be found any more.
1392 int prom_remove_property(struct device_node *np, struct property *prop)
1394 struct property **next;
1397 write_lock(&devtree_lock);
1398 next = &np->properties;
1400 if (*next == prop) {
1401 /* found the node */
1403 prop->next = np->deadprops;
1404 np->deadprops = prop;
1408 next = &(*next)->next;
1410 write_unlock(&devtree_lock);
1415 #ifdef CONFIG_PROC_DEVICETREE
1416 /* try to remove the proc node as well */
1418 proc_device_tree_remove_prop(np->pde, prop);
1419 #endif /* CONFIG_PROC_DEVICETREE */
1425 * Update a property in a node. Note that we don't actually
1426 * remove it, since we have given out who-knows-how-many pointers
1427 * to the data using get-property. Instead we just move the property
1428 * to the "dead properties" list, and add the new property to the
1431 int prom_update_property(struct device_node *np,
1432 struct property *newprop,
1433 struct property *oldprop)
1435 struct property **next;
1438 write_lock(&devtree_lock);
1439 next = &np->properties;
1441 if (*next == oldprop) {
1442 /* found the node */
1443 newprop->next = oldprop->next;
1445 oldprop->next = np->deadprops;
1446 np->deadprops = oldprop;
1450 next = &(*next)->next;
1452 write_unlock(&devtree_lock);
1457 #ifdef CONFIG_PROC_DEVICETREE
1458 /* try to add to proc as well if it was initialized */
1460 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1461 #endif /* CONFIG_PROC_DEVICETREE */
1467 /* Find the device node for a given logical cpu number, also returns the cpu
1468 * local thread number (index in ibm,interrupt-server#s) if relevant and
1469 * asked for (non NULL)
1471 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1474 struct device_node *np;
1476 hardid = get_hard_smp_processor_id(cpu);
1478 for_each_node_by_type(np, "cpu") {
1480 unsigned int plen, t;
1482 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1483 * fallback to "reg" property and assume no threads
1485 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1487 if (intserv == NULL) {
1488 const u32 *reg = of_get_property(np, "reg", NULL);
1491 if (*reg == hardid) {
1497 plen /= sizeof(u32);
1498 for (t = 0; t < plen; t++) {
1499 if (hardid == intserv[t]) {
1509 EXPORT_SYMBOL(of_get_cpu_node);
1511 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1512 static struct debugfs_blob_wrapper flat_dt_blob;
1514 static int __init export_flat_device_tree(void)
1518 flat_dt_blob.data = initial_boot_params;
1519 flat_dt_blob.size = initial_boot_params->totalsize;
1521 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1522 powerpc_debugfs_root, &flat_dt_blob);
1528 __initcall(export_flat_device_tree);