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 static struct device_node
*allnodes
= NULL
;
82 /* use when traversing tree through the allnext, child, sibling,
83 * or parent members of struct device_node.
85 static DEFINE_RWLOCK(devtree_lock
);
87 /* export that to outside world */
88 struct device_node
*of_chosen
;
90 static inline char *find_flat_dt_string(u32 offset
)
92 return ((char *)initial_boot_params
) +
93 initial_boot_params
->off_dt_strings
+ offset
;
97 * This function is used to scan the flattened device-tree, it is
98 * used to extract the memory informations at boot before we can
101 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
102 const char *uname
, int depth
,
106 unsigned long p
= ((unsigned long)initial_boot_params
) +
107 initial_boot_params
->off_dt_struct
;
112 u32 tag
= *((u32
*)p
);
116 if (tag
== OF_DT_END_NODE
) {
120 if (tag
== OF_DT_NOP
)
122 if (tag
== OF_DT_END
)
124 if (tag
== OF_DT_PROP
) {
125 u32 sz
= *((u32
*)p
);
127 if (initial_boot_params
->version
< 0x10)
128 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
133 if (tag
!= OF_DT_BEGIN_NODE
) {
134 printk(KERN_WARNING
"Invalid tag %x scanning flattened"
135 " device tree !\n", tag
);
140 p
= _ALIGN(p
+ strlen(pathp
) + 1, 4);
141 if ((*pathp
) == '/') {
143 for (lp
= NULL
, np
= pathp
; *np
; np
++)
149 rc
= it(p
, pathp
, depth
, data
);
157 unsigned long __init
of_get_flat_dt_root(void)
159 unsigned long p
= ((unsigned long)initial_boot_params
) +
160 initial_boot_params
->off_dt_struct
;
162 while(*((u32
*)p
) == OF_DT_NOP
)
164 BUG_ON (*((u32
*)p
) != OF_DT_BEGIN_NODE
);
166 return _ALIGN(p
+ strlen((char *)p
) + 1, 4);
170 * This function can be used within scan_flattened_dt callback to get
171 * access to properties
173 void* __init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
176 unsigned long p
= node
;
179 u32 tag
= *((u32
*)p
);
184 if (tag
== OF_DT_NOP
)
186 if (tag
!= OF_DT_PROP
)
190 noff
= *((u32
*)(p
+ 4));
192 if (initial_boot_params
->version
< 0x10)
193 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
195 nstr
= find_flat_dt_string(noff
);
197 printk(KERN_WARNING
"Can't find property index"
201 if (strcmp(name
, nstr
) == 0) {
211 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
214 unsigned long cplen
, l
;
216 cp
= of_get_flat_dt_prop(node
, "compatible", &cplen
);
220 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
230 static void *__init
unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
235 *mem
= _ALIGN(*mem
, align
);
242 static unsigned long __init
unflatten_dt_node(unsigned long mem
,
244 struct device_node
*dad
,
245 struct device_node
***allnextpp
,
246 unsigned long fpsize
)
248 struct device_node
*np
;
249 struct property
*pp
, **prev_pp
= NULL
;
252 unsigned int l
, allocl
;
256 tag
= *((u32
*)(*p
));
257 if (tag
!= OF_DT_BEGIN_NODE
) {
258 printk("Weird tag at start of node: %x\n", tag
);
263 l
= allocl
= strlen(pathp
) + 1;
264 *p
= _ALIGN(*p
+ l
, 4);
266 /* version 0x10 has a more compact unit name here instead of the full
267 * path. we accumulate the full path size using "fpsize", we'll rebuild
268 * it later. We detect this because the first character of the name is
271 if ((*pathp
) != '/') {
274 /* root node: special case. fpsize accounts for path
275 * plus terminating zero. root node only has '/', so
276 * fpsize should be 2, but we want to avoid the first
277 * level nodes to have two '/' so we use fpsize 1 here
282 /* account for '/' and path size minus terminal 0
291 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
292 __alignof__(struct device_node
));
294 memset(np
, 0, sizeof(*np
));
295 np
->full_name
= ((char*)np
) + sizeof(struct device_node
);
297 char *p
= np
->full_name
;
298 /* rebuild full path for new format */
299 if (dad
&& dad
->parent
) {
300 strcpy(p
, dad
->full_name
);
302 if ((strlen(p
) + l
+ 1) != allocl
) {
303 DBG("%s: p: %d, l: %d, a: %d\n",
304 pathp
, (int)strlen(p
), l
, allocl
);
312 memcpy(np
->full_name
, pathp
, l
);
313 prev_pp
= &np
->properties
;
315 *allnextpp
= &np
->allnext
;
318 /* we temporarily use the next field as `last_child'*/
322 dad
->next
->sibling
= np
;
325 kref_init(&np
->kref
);
331 tag
= *((u32
*)(*p
));
332 if (tag
== OF_DT_NOP
) {
336 if (tag
!= OF_DT_PROP
)
340 noff
= *((u32
*)((*p
) + 4));
342 if (initial_boot_params
->version
< 0x10)
343 *p
= _ALIGN(*p
, sz
>= 8 ? 8 : 4);
345 pname
= find_flat_dt_string(noff
);
347 printk("Can't find property name in list !\n");
350 if (strcmp(pname
, "name") == 0)
352 l
= strlen(pname
) + 1;
353 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
354 __alignof__(struct property
));
356 if (strcmp(pname
, "linux,phandle") == 0) {
357 np
->node
= *((u32
*)*p
);
358 if (np
->linux_phandle
== 0)
359 np
->linux_phandle
= np
->node
;
361 if (strcmp(pname
, "ibm,phandle") == 0)
362 np
->linux_phandle
= *((u32
*)*p
);
365 pp
->value
= (void *)*p
;
369 *p
= _ALIGN((*p
) + sz
, 4);
371 /* with version 0x10 we may not have the name property, recreate
372 * it here from the unit name if absent
375 char *p
= pathp
, *ps
= pathp
, *pa
= NULL
;
388 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
389 __alignof__(struct property
));
393 pp
->value
= (unsigned char *)(pp
+ 1);
396 memcpy(pp
->value
, ps
, sz
- 1);
397 ((char *)pp
->value
)[sz
- 1] = 0;
398 DBG("fixed up name for %s -> %s\n", pathp
, pp
->value
);
403 np
->name
= get_property(np
, "name", NULL
);
404 np
->type
= get_property(np
, "device_type", NULL
);
411 while (tag
== OF_DT_BEGIN_NODE
) {
412 mem
= unflatten_dt_node(mem
, p
, np
, allnextpp
, fpsize
);
413 tag
= *((u32
*)(*p
));
415 if (tag
!= OF_DT_END_NODE
) {
416 printk("Weird tag at end of node: %x\n", tag
);
423 static int __init
early_parse_mem(char *p
)
428 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
429 DBG("memory limit = 0x%lx\n", memory_limit
);
433 early_param("mem", early_parse_mem
);
436 * The device tree may be allocated below our memory limit, or inside the
437 * crash kernel region for kdump. If so, move it out now.
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},
535 /* put this back once we know how to test if firmware does 64k IO */
536 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
538 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
541 static void __init
scan_features(unsigned long node
, unsigned char *ftrs
,
542 unsigned long tablelen
,
543 struct ibm_pa_feature
*fp
,
544 unsigned long ft_size
)
546 unsigned long i
, len
, bit
;
548 /* find descriptor with type == 0 */
554 return; /* descriptor 0 not found */
561 /* loop over bits we know about */
562 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
563 if (fp
->pabyte
>= ftrs
[0])
565 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
566 if (bit
^ fp
->invert
) {
567 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
568 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
570 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
571 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
576 static void __init
check_cpu_pa_features(unsigned long node
)
578 unsigned char *pa_ftrs
;
579 unsigned long tablelen
;
581 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
585 scan_features(node
, pa_ftrs
, tablelen
,
586 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
589 static struct feature_property
{
592 unsigned long cpu_feature
;
593 unsigned long cpu_user_ftr
;
594 } feature_properties
[] __initdata
= {
595 #ifdef CONFIG_ALTIVEC
596 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
597 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
598 #endif /* CONFIG_ALTIVEC */
600 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
601 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
602 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
603 #endif /* CONFIG_PPC64 */
606 static void __init
check_cpu_feature_properties(unsigned long node
)
609 struct feature_property
*fp
= feature_properties
;
612 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
613 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
614 if (prop
&& *prop
>= fp
->min_value
) {
615 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
616 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
621 static int __init
early_init_dt_scan_cpus(unsigned long node
,
622 const char *uname
, int depth
,
625 static int logical_cpuid
= 0;
626 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
633 /* We are scanning "cpu" nodes only */
634 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
637 /* Get physical cpuid */
638 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
640 nthreads
= len
/ sizeof(int);
642 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
647 * Now see if any of these threads match our boot cpu.
648 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
650 for (i
= 0; i
< nthreads
; i
++) {
652 * version 2 of the kexec param format adds the phys cpuid of
655 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
657 initial_boot_params
->boot_cpuid_phys
) {
663 * Check if it's the boot-cpu, set it's hw index now,
664 * unfortunately this format did not support booting
665 * off secondary threads.
667 if (of_get_flat_dt_prop(node
,
668 "linux,boot-cpu", NULL
) != NULL
) {
675 /* logical cpu id is always 0 on UP kernels */
681 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
683 boot_cpuid
= logical_cpuid
;
684 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
687 * PAPR defines "logical" PVR values for cpus that
688 * meet various levels of the architecture:
689 * 0x0f000001 Architecture version 2.04
690 * 0x0f000002 Architecture version 2.05
691 * If the cpu-version property in the cpu node contains
692 * such a value, we call identify_cpu again with the
693 * logical PVR value in order to use the cpu feature
694 * bits appropriate for the architecture level.
696 * A POWER6 partition in "POWER6 architected" mode
697 * uses the 0x0f000002 PVR value; in POWER5+ mode
698 * it uses 0x0f000001.
700 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
701 if (prop
&& (*prop
& 0xff000000) == 0x0f000000)
702 identify_cpu(0, *prop
);
705 check_cpu_feature_properties(node
);
706 check_cpu_pa_features(node
);
708 #ifdef CONFIG_PPC_PSERIES
710 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
712 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
718 static int __init
early_init_dt_scan_chosen(unsigned long node
,
719 const char *uname
, int depth
, void *data
)
721 unsigned long *lprop
;
725 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
728 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
732 /* check if iommu is forced on or off */
733 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
735 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
739 /* mem=x on the command line is the preferred mechanism */
740 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
742 memory_limit
= *lprop
;
745 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
747 tce_alloc_start
= *lprop
;
748 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
750 tce_alloc_end
= *lprop
;
754 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
756 crashk_res
.start
= *lprop
;
758 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
760 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
763 /* Retreive command line */
764 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
765 if (p
!= NULL
&& l
> 0)
766 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
768 #ifdef CONFIG_CMDLINE
769 if (p
== NULL
|| l
== 0 || (l
== 1 && (*p
) == 0))
770 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
771 #endif /* CONFIG_CMDLINE */
773 DBG("Command line is: %s\n", cmd_line
);
779 static int __init
early_init_dt_scan_root(unsigned long node
,
780 const char *uname
, int depth
, void *data
)
787 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
788 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
789 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
791 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
792 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
793 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
799 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
804 return of_read_ulong(p
, s
);
807 #ifdef CONFIG_PPC_PSERIES
809 * Interpret the ibm,dynamic-memory property in the
810 * /ibm,dynamic-reconfiguration-memory node.
811 * This contains a list of memory blocks along with NUMA affinity
814 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
818 unsigned long base
, size
, lmb_size
, flags
;
820 ls
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
821 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(cell_t
))
823 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
825 dm
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
826 if (dm
== NULL
|| l
< sizeof(cell_t
))
829 n
= *dm
++; /* number of entries */
830 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(cell_t
))
833 for (; n
!= 0; --n
) {
834 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
836 /* skip DRC index, pad, assoc. list index, flags */
838 /* skip this block if the reserved bit is set in flags (0x80)
839 or if the block is not assigned to this partition (0x8) */
840 if ((flags
& 0x80) || !(flags
& 0x8))
844 if (base
>= 0x80000000ul
)
846 if ((base
+ size
) > 0x80000000ul
)
847 size
= 0x80000000ul
- base
;
855 #define early_init_dt_scan_drconf_memory(node) 0
856 #endif /* CONFIG_PPC_PSERIES */
858 static int __init
early_init_dt_scan_memory(unsigned long node
,
859 const char *uname
, int depth
, void *data
)
861 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
865 /* Look for the ibm,dynamic-reconfiguration-memory node */
867 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
868 return early_init_dt_scan_drconf_memory(node
);
870 /* We are scanning "memory" nodes only */
873 * The longtrail doesn't have a device_type on the
874 * /memory node, so look for the node called /memory@0.
876 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
878 } else if (strcmp(type
, "memory") != 0)
881 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
883 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
887 endp
= reg
+ (l
/ sizeof(cell_t
));
889 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
890 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
892 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
893 unsigned long base
, size
;
895 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
896 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
900 DBG(" - %lx , %lx\n", base
, size
);
903 if (base
>= 0x80000000ul
)
905 if ((base
+ size
) > 0x80000000ul
)
906 size
= 0x80000000ul
- base
;
914 static void __init
early_reserve_mem(void)
918 unsigned long self_base
;
919 unsigned long self_size
;
921 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
922 initial_boot_params
->off_mem_rsvmap
);
924 /* before we do anything, lets reserve the dt blob */
925 self_base
= __pa((unsigned long)initial_boot_params
);
926 self_size
= initial_boot_params
->totalsize
;
927 lmb_reserve(self_base
, self_size
);
931 * Handle the case where we might be booting from an old kexec
932 * image that setup the mem_rsvmap as pairs of 32-bit values
934 if (*reserve_map
> 0xffffffffull
) {
935 u32 base_32
, size_32
;
936 u32
*reserve_map_32
= (u32
*)reserve_map
;
939 base_32
= *(reserve_map_32
++);
940 size_32
= *(reserve_map_32
++);
943 /* skip if the reservation is for the blob */
944 if (base_32
== self_base
&& size_32
== self_size
)
946 DBG("reserving: %x -> %x\n", base_32
, size_32
);
947 lmb_reserve(base_32
, size_32
);
953 base
= *(reserve_map
++);
954 size
= *(reserve_map
++);
957 /* skip if the reservation is for the blob */
958 if (base
== self_base
&& size
== self_size
)
960 DBG("reserving: %llx -> %llx\n", base
, size
);
961 lmb_reserve(base
, size
);
965 DBG("memory reserved, lmbs :\n");
970 void __init
early_init_devtree(void *params
)
972 DBG(" -> early_init_devtree()\n");
974 /* Setup flat device-tree pointer */
975 initial_boot_params
= params
;
977 #ifdef CONFIG_PPC_RTAS
978 /* Some machines might need RTAS info for debugging, grab it now. */
979 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
982 /* Retrieve various informations from the /chosen node of the
983 * device-tree, including the platform type, initrd location and
984 * size, TCE reserve, and more ...
986 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
988 /* Scan memory nodes and rebuild LMBs */
990 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
991 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
993 /* Save command line for /proc/cmdline and then parse parameters */
994 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
997 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
998 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
999 reserve_kdump_trampoline();
1000 reserve_crashkernel();
1001 early_reserve_mem();
1003 lmb_enforce_memory_limit(memory_limit
);
1006 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1008 /* We may need to relocate the flat tree, do it now.
1009 * FIXME .. and the initrd too? */
1012 DBG("Scanning CPUs ...\n");
1014 /* Retreive CPU related informations from the flat tree
1015 * (altivec support, boot CPU ID, ...)
1017 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1019 DBG(" <- early_init_devtree()\n");
1025 prom_n_addr_cells(struct device_node
* np
)
1031 ip
= get_property(np
, "#address-cells", NULL
);
1034 } while (np
->parent
);
1035 /* No #address-cells property for the root node, default to 1 */
1038 EXPORT_SYMBOL(prom_n_addr_cells
);
1041 prom_n_size_cells(struct device_node
* np
)
1047 ip
= get_property(np
, "#size-cells", NULL
);
1050 } while (np
->parent
);
1051 /* No #size-cells property for the root node, default to 1 */
1054 EXPORT_SYMBOL(prom_n_size_cells
);
1057 * Construct and return a list of the device_nodes with a given name.
1059 struct device_node
*find_devices(const char *name
)
1061 struct device_node
*head
, **prevp
, *np
;
1064 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1065 if (np
->name
!= 0 && strcasecmp(np
->name
, name
) == 0) {
1073 EXPORT_SYMBOL(find_devices
);
1076 * Construct and return a list of the device_nodes with a given type.
1078 struct device_node
*find_type_devices(const char *type
)
1080 struct device_node
*head
, **prevp
, *np
;
1083 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1084 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0) {
1092 EXPORT_SYMBOL(find_type_devices
);
1095 * Returns all nodes linked together
1097 struct device_node
*find_all_nodes(void)
1099 struct device_node
*head
, **prevp
, *np
;
1102 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1109 EXPORT_SYMBOL(find_all_nodes
);
1111 /** Checks if the given "compat" string matches one of the strings in
1112 * the device's "compatible" property
1114 int device_is_compatible(const struct device_node
*device
, const char *compat
)
1119 cp
= get_property(device
, "compatible", &cplen
);
1123 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1132 EXPORT_SYMBOL(device_is_compatible
);
1136 * Indicates whether the root node has a given value in its
1137 * compatible property.
1139 int machine_is_compatible(const char *compat
)
1141 struct device_node
*root
;
1144 root
= of_find_node_by_path("/");
1146 rc
= device_is_compatible(root
, compat
);
1151 EXPORT_SYMBOL(machine_is_compatible
);
1154 * Construct and return a list of the device_nodes with a given type
1155 * and compatible property.
1157 struct device_node
*find_compatible_devices(const char *type
,
1160 struct device_node
*head
, **prevp
, *np
;
1163 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1165 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1167 if (device_is_compatible(np
, compat
)) {
1175 EXPORT_SYMBOL(find_compatible_devices
);
1178 * Find the device_node with a given full_name.
1180 struct device_node
*find_path_device(const char *path
)
1182 struct device_node
*np
;
1184 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1185 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0)
1189 EXPORT_SYMBOL(find_path_device
);
1193 * New implementation of the OF "find" APIs, return a refcounted
1194 * object, call of_node_put() when done. The device tree and list
1195 * are protected by a rw_lock.
1197 * Note that property management will need some locking as well,
1198 * this isn't dealt with yet.
1203 * of_find_node_by_name - Find a node by its "name" property
1204 * @from: The node to start searching from or NULL, the node
1205 * you pass will not be searched, only the next one
1206 * will; typically, you pass what the previous call
1207 * returned. of_node_put() will be called on it
1208 * @name: The name string to match against
1210 * Returns a node pointer with refcount incremented, use
1211 * of_node_put() on it when done.
1213 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1216 struct device_node
*np
;
1218 read_lock(&devtree_lock
);
1219 np
= from
? from
->allnext
: allnodes
;
1220 for (; np
!= NULL
; np
= np
->allnext
)
1221 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1225 read_unlock(&devtree_lock
);
1228 EXPORT_SYMBOL(of_find_node_by_name
);
1231 * of_find_node_by_type - Find a node by its "device_type" property
1232 * @from: The node to start searching from or NULL, the node
1233 * you pass will not be searched, only the next one
1234 * will; typically, you pass what the previous call
1235 * returned. of_node_put() will be called on it
1236 * @name: The type string to match against
1238 * Returns a node pointer with refcount incremented, use
1239 * of_node_put() on it when done.
1241 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1244 struct device_node
*np
;
1246 read_lock(&devtree_lock
);
1247 np
= from
? from
->allnext
: allnodes
;
1248 for (; np
!= 0; np
= np
->allnext
)
1249 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1253 read_unlock(&devtree_lock
);
1256 EXPORT_SYMBOL(of_find_node_by_type
);
1259 * of_find_compatible_node - Find a node based on type and one of the
1260 * tokens in its "compatible" property
1261 * @from: The node to start searching from or NULL, the node
1262 * you pass will not be searched, only the next one
1263 * will; typically, you pass what the previous call
1264 * returned. of_node_put() will be called on it
1265 * @type: The type string to match "device_type" or NULL to ignore
1266 * @compatible: The string to match to one of the tokens in the device
1267 * "compatible" list.
1269 * Returns a node pointer with refcount incremented, use
1270 * of_node_put() on it when done.
1272 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1273 const char *type
, const char *compatible
)
1275 struct device_node
*np
;
1277 read_lock(&devtree_lock
);
1278 np
= from
? from
->allnext
: allnodes
;
1279 for (; np
!= 0; np
= np
->allnext
) {
1281 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1283 if (device_is_compatible(np
, compatible
) && of_node_get(np
))
1287 read_unlock(&devtree_lock
);
1290 EXPORT_SYMBOL(of_find_compatible_node
);
1293 * of_find_node_by_path - Find a node matching a full OF path
1294 * @path: The full path to match
1296 * Returns a node pointer with refcount incremented, use
1297 * of_node_put() on it when done.
1299 struct device_node
*of_find_node_by_path(const char *path
)
1301 struct device_node
*np
= allnodes
;
1303 read_lock(&devtree_lock
);
1304 for (; np
!= 0; np
= np
->allnext
) {
1305 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1309 read_unlock(&devtree_lock
);
1312 EXPORT_SYMBOL(of_find_node_by_path
);
1315 * of_find_node_by_phandle - Find a node given a phandle
1316 * @handle: phandle of the node to find
1318 * Returns a node pointer with refcount incremented, use
1319 * of_node_put() on it when done.
1321 struct device_node
*of_find_node_by_phandle(phandle handle
)
1323 struct device_node
*np
;
1325 read_lock(&devtree_lock
);
1326 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1327 if (np
->linux_phandle
== handle
)
1330 read_unlock(&devtree_lock
);
1333 EXPORT_SYMBOL(of_find_node_by_phandle
);
1336 * of_find_all_nodes - Get next node in global list
1337 * @prev: Previous node or NULL to start iteration
1338 * of_node_put() will be called on it
1340 * Returns a node pointer with refcount incremented, use
1341 * of_node_put() on it when done.
1343 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1345 struct device_node
*np
;
1347 read_lock(&devtree_lock
);
1348 np
= prev
? prev
->allnext
: allnodes
;
1349 for (; np
!= 0; np
= np
->allnext
)
1350 if (of_node_get(np
))
1353 read_unlock(&devtree_lock
);
1356 EXPORT_SYMBOL(of_find_all_nodes
);
1359 * of_get_parent - Get a node's parent if any
1360 * @node: Node to get parent
1362 * Returns a node pointer with refcount incremented, use
1363 * of_node_put() on it when done.
1365 struct device_node
*of_get_parent(const struct device_node
*node
)
1367 struct device_node
*np
;
1372 read_lock(&devtree_lock
);
1373 np
= of_node_get(node
->parent
);
1374 read_unlock(&devtree_lock
);
1377 EXPORT_SYMBOL(of_get_parent
);
1380 * of_get_next_child - Iterate a node childs
1381 * @node: parent node
1382 * @prev: previous child of the parent node, or NULL to get first
1384 * Returns a node pointer with refcount incremented, use
1385 * of_node_put() on it when done.
1387 struct device_node
*of_get_next_child(const struct device_node
*node
,
1388 struct device_node
*prev
)
1390 struct device_node
*next
;
1392 read_lock(&devtree_lock
);
1393 next
= prev
? prev
->sibling
: node
->child
;
1394 for (; next
!= 0; next
= next
->sibling
)
1395 if (of_node_get(next
))
1398 read_unlock(&devtree_lock
);
1401 EXPORT_SYMBOL(of_get_next_child
);
1404 * of_node_get - Increment refcount of a node
1405 * @node: Node to inc refcount, NULL is supported to
1406 * simplify writing of callers
1410 struct device_node
*of_node_get(struct device_node
*node
)
1413 kref_get(&node
->kref
);
1416 EXPORT_SYMBOL(of_node_get
);
1418 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1420 return container_of(kref
, struct device_node
, kref
);
1424 * of_node_release - release a dynamically allocated node
1425 * @kref: kref element of the node to be released
1427 * In of_node_put() this function is passed to kref_put()
1428 * as the destructor.
1430 static void of_node_release(struct kref
*kref
)
1432 struct device_node
*node
= kref_to_device_node(kref
);
1433 struct property
*prop
= node
->properties
;
1435 if (!OF_IS_DYNAMIC(node
))
1438 struct property
*next
= prop
->next
;
1445 prop
= node
->deadprops
;
1446 node
->deadprops
= NULL
;
1449 kfree(node
->full_name
);
1455 * of_node_put - Decrement refcount of a node
1456 * @node: Node to dec refcount, NULL is supported to
1457 * simplify writing of callers
1460 void of_node_put(struct device_node
*node
)
1463 kref_put(&node
->kref
, of_node_release
);
1465 EXPORT_SYMBOL(of_node_put
);
1468 * Plug a device node into the tree and global list.
1470 void of_attach_node(struct device_node
*np
)
1472 write_lock(&devtree_lock
);
1473 np
->sibling
= np
->parent
->child
;
1474 np
->allnext
= allnodes
;
1475 np
->parent
->child
= np
;
1477 write_unlock(&devtree_lock
);
1481 * "Unplug" a node from the device tree. The caller must hold
1482 * a reference to the node. The memory associated with the node
1483 * is not freed until its refcount goes to zero.
1485 void of_detach_node(const struct device_node
*np
)
1487 struct device_node
*parent
;
1489 write_lock(&devtree_lock
);
1491 parent
= np
->parent
;
1494 allnodes
= np
->allnext
;
1496 struct device_node
*prev
;
1497 for (prev
= allnodes
;
1498 prev
->allnext
!= np
;
1499 prev
= prev
->allnext
)
1501 prev
->allnext
= np
->allnext
;
1504 if (parent
->child
== np
)
1505 parent
->child
= np
->sibling
;
1507 struct device_node
*prevsib
;
1508 for (prevsib
= np
->parent
->child
;
1509 prevsib
->sibling
!= np
;
1510 prevsib
= prevsib
->sibling
)
1512 prevsib
->sibling
= np
->sibling
;
1515 write_unlock(&devtree_lock
);
1518 #ifdef CONFIG_PPC_PSERIES
1520 * Fix up the uninitialized fields in a new device node:
1521 * name, type and pci-specific fields
1524 static int of_finish_dynamic_node(struct device_node
*node
)
1526 struct device_node
*parent
= of_get_parent(node
);
1528 const phandle
*ibm_phandle
;
1530 node
->name
= get_property(node
, "name", NULL
);
1531 node
->type
= get_property(node
, "device_type", NULL
);
1538 /* We don't support that function on PowerMac, at least
1541 if (machine_is(powermac
))
1544 /* fix up new node's linux_phandle field */
1545 if ((ibm_phandle
= get_property(node
, "ibm,phandle", NULL
)))
1546 node
->linux_phandle
= *ibm_phandle
;
1549 of_node_put(parent
);
1553 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1554 unsigned long action
, void *node
)
1559 case PSERIES_RECONFIG_ADD
:
1560 err
= of_finish_dynamic_node(node
);
1562 printk(KERN_ERR
"finish_node returned %d\n", err
);
1573 static struct notifier_block prom_reconfig_nb
= {
1574 .notifier_call
= prom_reconfig_notifier
,
1575 .priority
= 10, /* This one needs to run first */
1578 static int __init
prom_reconfig_setup(void)
1580 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1582 __initcall(prom_reconfig_setup
);
1585 struct property
*of_find_property(const struct device_node
*np
,
1589 struct property
*pp
;
1591 read_lock(&devtree_lock
);
1592 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1593 if (strcmp(pp
->name
, name
) == 0) {
1598 read_unlock(&devtree_lock
);
1602 EXPORT_SYMBOL(of_find_property
);
1605 * Find a property with a given name for a given node
1606 * and return the value.
1608 const void *get_property(const struct device_node
*np
, const char *name
,
1611 struct property
*pp
= of_find_property(np
,name
,lenp
);
1612 return pp
? pp
->value
: NULL
;
1614 EXPORT_SYMBOL(get_property
);
1617 * Add a property to a node
1619 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1621 struct property
**next
;
1624 write_lock(&devtree_lock
);
1625 next
= &np
->properties
;
1627 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1628 /* duplicate ! don't insert it */
1629 write_unlock(&devtree_lock
);
1632 next
= &(*next
)->next
;
1635 write_unlock(&devtree_lock
);
1637 #ifdef CONFIG_PROC_DEVICETREE
1638 /* try to add to proc as well if it was initialized */
1640 proc_device_tree_add_prop(np
->pde
, prop
);
1641 #endif /* CONFIG_PROC_DEVICETREE */
1647 * Remove a property from a node. Note that we don't actually
1648 * remove it, since we have given out who-knows-how-many pointers
1649 * to the data using get-property. Instead we just move the property
1650 * to the "dead properties" list, so it won't be found any more.
1652 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1654 struct property
**next
;
1657 write_lock(&devtree_lock
);
1658 next
= &np
->properties
;
1660 if (*next
== prop
) {
1661 /* found the node */
1663 prop
->next
= np
->deadprops
;
1664 np
->deadprops
= prop
;
1668 next
= &(*next
)->next
;
1670 write_unlock(&devtree_lock
);
1675 #ifdef CONFIG_PROC_DEVICETREE
1676 /* try to remove the proc node as well */
1678 proc_device_tree_remove_prop(np
->pde
, prop
);
1679 #endif /* CONFIG_PROC_DEVICETREE */
1685 * Update a property in a node. Note that we don't actually
1686 * remove it, since we have given out who-knows-how-many pointers
1687 * to the data using get-property. Instead we just move the property
1688 * to the "dead properties" list, and add the new property to the
1691 int prom_update_property(struct device_node
*np
,
1692 struct property
*newprop
,
1693 struct property
*oldprop
)
1695 struct property
**next
;
1698 write_lock(&devtree_lock
);
1699 next
= &np
->properties
;
1701 if (*next
== oldprop
) {
1702 /* found the node */
1703 newprop
->next
= oldprop
->next
;
1705 oldprop
->next
= np
->deadprops
;
1706 np
->deadprops
= oldprop
;
1710 next
= &(*next
)->next
;
1712 write_unlock(&devtree_lock
);
1717 #ifdef CONFIG_PROC_DEVICETREE
1718 /* try to add to proc as well if it was initialized */
1720 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1721 #endif /* CONFIG_PROC_DEVICETREE */
1727 /* Find the device node for a given logical cpu number, also returns the cpu
1728 * local thread number (index in ibm,interrupt-server#s) if relevant and
1729 * asked for (non NULL)
1731 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1734 struct device_node
*np
;
1736 hardid
= get_hard_smp_processor_id(cpu
);
1738 for_each_node_by_type(np
, "cpu") {
1740 unsigned int plen
, t
;
1742 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1743 * fallback to "reg" property and assume no threads
1745 intserv
= get_property(np
, "ibm,ppc-interrupt-server#s",
1747 if (intserv
== NULL
) {
1748 const u32
*reg
= get_property(np
, "reg", NULL
);
1751 if (*reg
== hardid
) {
1757 plen
/= sizeof(u32
);
1758 for (t
= 0; t
< plen
; t
++) {
1759 if (hardid
== intserv
[t
]) {
1769 EXPORT_SYMBOL(of_get_cpu_node
);
1772 static struct debugfs_blob_wrapper flat_dt_blob
;
1774 static int __init
export_flat_device_tree(void)
1778 d
= debugfs_create_dir("powerpc", NULL
);
1782 flat_dt_blob
.data
= initial_boot_params
;
1783 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1785 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1792 __initcall(export_flat_device_tree
);