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
= of_get_property(np
, "name", NULL
);
404 np
->type
= of_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
;
726 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
729 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
733 /* check if iommu is forced on or off */
734 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
736 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
740 /* mem=x on the command line is the preferred mechanism */
741 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
743 memory_limit
= *lprop
;
746 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
748 tce_alloc_start
= *lprop
;
749 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
751 tce_alloc_end
= *lprop
;
755 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
757 crashk_res
.start
= *lprop
;
759 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
761 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
764 #ifdef CONFIG_BLK_DEV_INITRD
765 DBG("Looking for initrd properties... ");
766 prop
= of_get_flat_dt_prop(node
, "linux,initrd-start", &l
);
768 initrd_start
= (unsigned long)__va(of_read_ulong(prop
, l
/4));
769 prop
= of_get_flat_dt_prop(node
, "linux,initrd-end", &l
);
771 initrd_end
= (unsigned long)__va(of_read_ulong(prop
, l
/4));
772 initrd_below_start_ok
= 1;
777 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start
, initrd_end
);
778 #endif /* CONFIG_BLK_DEV_INITRD */
780 /* Retreive command line */
781 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
782 if (p
!= NULL
&& l
> 0)
783 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
785 #ifdef CONFIG_CMDLINE
786 if (p
== NULL
|| l
== 0 || (l
== 1 && (*p
) == 0))
787 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
788 #endif /* CONFIG_CMDLINE */
790 DBG("Command line is: %s\n", cmd_line
);
796 static int __init
early_init_dt_scan_root(unsigned long node
,
797 const char *uname
, int depth
, void *data
)
804 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
805 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
806 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
808 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
809 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
810 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
816 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
821 return of_read_ulong(p
, s
);
824 #ifdef CONFIG_PPC_PSERIES
826 * Interpret the ibm,dynamic-memory property in the
827 * /ibm,dynamic-reconfiguration-memory node.
828 * This contains a list of memory blocks along with NUMA affinity
831 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
835 unsigned long base
, size
, lmb_size
, flags
;
837 ls
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
838 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(cell_t
))
840 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
842 dm
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
843 if (dm
== NULL
|| l
< sizeof(cell_t
))
846 n
= *dm
++; /* number of entries */
847 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(cell_t
))
850 for (; n
!= 0; --n
) {
851 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
853 /* skip DRC index, pad, assoc. list index, flags */
855 /* skip this block if the reserved bit is set in flags (0x80)
856 or if the block is not assigned to this partition (0x8) */
857 if ((flags
& 0x80) || !(flags
& 0x8))
861 if (base
>= 0x80000000ul
)
863 if ((base
+ size
) > 0x80000000ul
)
864 size
= 0x80000000ul
- base
;
872 #define early_init_dt_scan_drconf_memory(node) 0
873 #endif /* CONFIG_PPC_PSERIES */
875 static int __init
early_init_dt_scan_memory(unsigned long node
,
876 const char *uname
, int depth
, void *data
)
878 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
882 /* Look for the ibm,dynamic-reconfiguration-memory node */
884 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
885 return early_init_dt_scan_drconf_memory(node
);
887 /* We are scanning "memory" nodes only */
890 * The longtrail doesn't have a device_type on the
891 * /memory node, so look for the node called /memory@0.
893 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
895 } else if (strcmp(type
, "memory") != 0)
898 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
900 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
904 endp
= reg
+ (l
/ sizeof(cell_t
));
906 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
907 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
909 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
910 unsigned long base
, size
;
912 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
913 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
917 DBG(" - %lx , %lx\n", base
, size
);
920 if (base
>= 0x80000000ul
)
922 if ((base
+ size
) > 0x80000000ul
)
923 size
= 0x80000000ul
- base
;
931 static void __init
early_reserve_mem(void)
935 unsigned long self_base
;
936 unsigned long self_size
;
938 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
939 initial_boot_params
->off_mem_rsvmap
);
941 /* before we do anything, lets reserve the dt blob */
942 self_base
= __pa((unsigned long)initial_boot_params
);
943 self_size
= initial_boot_params
->totalsize
;
944 lmb_reserve(self_base
, self_size
);
946 #ifdef CONFIG_BLK_DEV_INITRD
947 /* then reserve the initrd, if any */
948 if (initrd_start
&& (initrd_end
> initrd_start
))
949 lmb_reserve(__pa(initrd_start
), initrd_end
- initrd_start
);
950 #endif /* CONFIG_BLK_DEV_INITRD */
954 * Handle the case where we might be booting from an old kexec
955 * image that setup the mem_rsvmap as pairs of 32-bit values
957 if (*reserve_map
> 0xffffffffull
) {
958 u32 base_32
, size_32
;
959 u32
*reserve_map_32
= (u32
*)reserve_map
;
962 base_32
= *(reserve_map_32
++);
963 size_32
= *(reserve_map_32
++);
966 /* skip if the reservation is for the blob */
967 if (base_32
== self_base
&& size_32
== self_size
)
969 DBG("reserving: %x -> %x\n", base_32
, size_32
);
970 lmb_reserve(base_32
, size_32
);
976 base
= *(reserve_map
++);
977 size
= *(reserve_map
++);
980 DBG("reserving: %llx -> %llx\n", base
, size
);
981 lmb_reserve(base
, size
);
985 DBG("memory reserved, lmbs :\n");
990 void __init
early_init_devtree(void *params
)
992 DBG(" -> early_init_devtree()\n");
994 /* Setup flat device-tree pointer */
995 initial_boot_params
= params
;
997 #ifdef CONFIG_PPC_RTAS
998 /* Some machines might need RTAS info for debugging, grab it now. */
999 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
1002 /* Retrieve various informations from the /chosen node of the
1003 * device-tree, including the platform type, initrd location and
1004 * size, TCE reserve, and more ...
1006 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
1008 /* Scan memory nodes and rebuild LMBs */
1010 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
1011 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
1013 /* Save command line for /proc/cmdline and then parse parameters */
1014 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
1015 parse_early_param();
1017 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1018 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
1019 reserve_kdump_trampoline();
1020 reserve_crashkernel();
1021 early_reserve_mem();
1023 lmb_enforce_memory_limit(memory_limit
);
1026 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1028 /* We may need to relocate the flat tree, do it now.
1029 * FIXME .. and the initrd too? */
1032 DBG("Scanning CPUs ...\n");
1034 /* Retreive CPU related informations from the flat tree
1035 * (altivec support, boot CPU ID, ...)
1037 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1039 DBG(" <- early_init_devtree()\n");
1044 int of_n_addr_cells(struct device_node
* np
)
1050 ip
= of_get_property(np
, "#address-cells", NULL
);
1053 } while (np
->parent
);
1054 /* No #address-cells property for the root node, default to 1 */
1057 EXPORT_SYMBOL(of_n_addr_cells
);
1059 int of_n_size_cells(struct device_node
* np
)
1065 ip
= of_get_property(np
, "#size-cells", NULL
);
1068 } while (np
->parent
);
1069 /* No #size-cells property for the root node, default to 1 */
1072 EXPORT_SYMBOL(of_n_size_cells
);
1075 * Construct and return a list of the device_nodes with a given name.
1077 struct device_node
*find_devices(const char *name
)
1079 struct device_node
*head
, **prevp
, *np
;
1082 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1083 if (np
->name
!= 0 && strcasecmp(np
->name
, name
) == 0) {
1091 EXPORT_SYMBOL(find_devices
);
1094 * Construct and return a list of the device_nodes with a given type.
1096 struct device_node
*find_type_devices(const char *type
)
1098 struct device_node
*head
, **prevp
, *np
;
1101 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1102 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0) {
1110 EXPORT_SYMBOL(find_type_devices
);
1113 * Returns all nodes linked together
1115 struct device_node
*find_all_nodes(void)
1117 struct device_node
*head
, **prevp
, *np
;
1120 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1127 EXPORT_SYMBOL(find_all_nodes
);
1129 /** Checks if the given "compat" string matches one of the strings in
1130 * the device's "compatible" property
1132 int of_device_is_compatible(const struct device_node
*device
,
1138 cp
= of_get_property(device
, "compatible", &cplen
);
1142 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1151 EXPORT_SYMBOL(of_device_is_compatible
);
1155 * Indicates whether the root node has a given value in its
1156 * compatible property.
1158 int machine_is_compatible(const char *compat
)
1160 struct device_node
*root
;
1163 root
= of_find_node_by_path("/");
1165 rc
= of_device_is_compatible(root
, compat
);
1170 EXPORT_SYMBOL(machine_is_compatible
);
1173 * Construct and return a list of the device_nodes with a given type
1174 * and compatible property.
1176 struct device_node
*find_compatible_devices(const char *type
,
1179 struct device_node
*head
, **prevp
, *np
;
1182 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1184 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1186 if (of_device_is_compatible(np
, compat
)) {
1194 EXPORT_SYMBOL(find_compatible_devices
);
1197 * Find the device_node with a given full_name.
1199 struct device_node
*find_path_device(const char *path
)
1201 struct device_node
*np
;
1203 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1204 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0)
1208 EXPORT_SYMBOL(find_path_device
);
1212 * New implementation of the OF "find" APIs, return a refcounted
1213 * object, call of_node_put() when done. The device tree and list
1214 * are protected by a rw_lock.
1216 * Note that property management will need some locking as well,
1217 * this isn't dealt with yet.
1222 * of_find_node_by_name - Find a node by its "name" property
1223 * @from: The node to start searching from or NULL, the node
1224 * you pass will not be searched, only the next one
1225 * will; typically, you pass what the previous call
1226 * returned. of_node_put() will be called on it
1227 * @name: The name string to match against
1229 * Returns a node pointer with refcount incremented, use
1230 * of_node_put() on it when done.
1232 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1235 struct device_node
*np
;
1237 read_lock(&devtree_lock
);
1238 np
= from
? from
->allnext
: allnodes
;
1239 for (; np
!= NULL
; np
= np
->allnext
)
1240 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1244 read_unlock(&devtree_lock
);
1247 EXPORT_SYMBOL(of_find_node_by_name
);
1250 * of_find_node_by_type - Find a node by its "device_type" property
1251 * @from: The node to start searching from or NULL, the node
1252 * you pass will not be searched, only the next one
1253 * will; typically, you pass what the previous call
1254 * returned. of_node_put() will be called on it
1255 * @name: The type string to match against
1257 * Returns a node pointer with refcount incremented, use
1258 * of_node_put() on it when done.
1260 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1263 struct device_node
*np
;
1265 read_lock(&devtree_lock
);
1266 np
= from
? from
->allnext
: allnodes
;
1267 for (; np
!= 0; np
= np
->allnext
)
1268 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1272 read_unlock(&devtree_lock
);
1275 EXPORT_SYMBOL(of_find_node_by_type
);
1278 * of_find_compatible_node - Find a node based on type and one of the
1279 * tokens in its "compatible" property
1280 * @from: The node to start searching from or NULL, the node
1281 * you pass will not be searched, only the next one
1282 * will; typically, you pass what the previous call
1283 * returned. of_node_put() will be called on it
1284 * @type: The type string to match "device_type" or NULL to ignore
1285 * @compatible: The string to match to one of the tokens in the device
1286 * "compatible" list.
1288 * Returns a node pointer with refcount incremented, use
1289 * of_node_put() on it when done.
1291 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1292 const char *type
, const char *compatible
)
1294 struct device_node
*np
;
1296 read_lock(&devtree_lock
);
1297 np
= from
? from
->allnext
: allnodes
;
1298 for (; np
!= 0; np
= np
->allnext
) {
1300 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1302 if (of_device_is_compatible(np
, compatible
) && of_node_get(np
))
1306 read_unlock(&devtree_lock
);
1309 EXPORT_SYMBOL(of_find_compatible_node
);
1312 * of_find_node_by_path - Find a node matching a full OF path
1313 * @path: The full path to match
1315 * Returns a node pointer with refcount incremented, use
1316 * of_node_put() on it when done.
1318 struct device_node
*of_find_node_by_path(const char *path
)
1320 struct device_node
*np
= allnodes
;
1322 read_lock(&devtree_lock
);
1323 for (; np
!= 0; np
= np
->allnext
) {
1324 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1328 read_unlock(&devtree_lock
);
1331 EXPORT_SYMBOL(of_find_node_by_path
);
1334 * of_find_node_by_phandle - Find a node given a phandle
1335 * @handle: phandle of the node to find
1337 * Returns a node pointer with refcount incremented, use
1338 * of_node_put() on it when done.
1340 struct device_node
*of_find_node_by_phandle(phandle handle
)
1342 struct device_node
*np
;
1344 read_lock(&devtree_lock
);
1345 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1346 if (np
->linux_phandle
== handle
)
1349 read_unlock(&devtree_lock
);
1352 EXPORT_SYMBOL(of_find_node_by_phandle
);
1355 * of_find_all_nodes - Get next node in global list
1356 * @prev: Previous node or NULL to start iteration
1357 * of_node_put() will be called on it
1359 * Returns a node pointer with refcount incremented, use
1360 * of_node_put() on it when done.
1362 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1364 struct device_node
*np
;
1366 read_lock(&devtree_lock
);
1367 np
= prev
? prev
->allnext
: allnodes
;
1368 for (; np
!= 0; np
= np
->allnext
)
1369 if (of_node_get(np
))
1372 read_unlock(&devtree_lock
);
1375 EXPORT_SYMBOL(of_find_all_nodes
);
1378 * of_get_parent - Get a node's parent if any
1379 * @node: Node to get parent
1381 * Returns a node pointer with refcount incremented, use
1382 * of_node_put() on it when done.
1384 struct device_node
*of_get_parent(const struct device_node
*node
)
1386 struct device_node
*np
;
1391 read_lock(&devtree_lock
);
1392 np
= of_node_get(node
->parent
);
1393 read_unlock(&devtree_lock
);
1396 EXPORT_SYMBOL(of_get_parent
);
1399 * of_get_next_child - Iterate a node childs
1400 * @node: parent node
1401 * @prev: previous child of the parent node, or NULL to get first
1403 * Returns a node pointer with refcount incremented, use
1404 * of_node_put() on it when done.
1406 struct device_node
*of_get_next_child(const struct device_node
*node
,
1407 struct device_node
*prev
)
1409 struct device_node
*next
;
1411 read_lock(&devtree_lock
);
1412 next
= prev
? prev
->sibling
: node
->child
;
1413 for (; next
!= 0; next
= next
->sibling
)
1414 if (of_node_get(next
))
1417 read_unlock(&devtree_lock
);
1420 EXPORT_SYMBOL(of_get_next_child
);
1423 * of_node_get - Increment refcount of a node
1424 * @node: Node to inc refcount, NULL is supported to
1425 * simplify writing of callers
1429 struct device_node
*of_node_get(struct device_node
*node
)
1432 kref_get(&node
->kref
);
1435 EXPORT_SYMBOL(of_node_get
);
1437 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1439 return container_of(kref
, struct device_node
, kref
);
1443 * of_node_release - release a dynamically allocated node
1444 * @kref: kref element of the node to be released
1446 * In of_node_put() this function is passed to kref_put()
1447 * as the destructor.
1449 static void of_node_release(struct kref
*kref
)
1451 struct device_node
*node
= kref_to_device_node(kref
);
1452 struct property
*prop
= node
->properties
;
1454 if (!OF_IS_DYNAMIC(node
))
1457 struct property
*next
= prop
->next
;
1464 prop
= node
->deadprops
;
1465 node
->deadprops
= NULL
;
1468 kfree(node
->full_name
);
1474 * of_node_put - Decrement refcount of a node
1475 * @node: Node to dec refcount, NULL is supported to
1476 * simplify writing of callers
1479 void of_node_put(struct device_node
*node
)
1482 kref_put(&node
->kref
, of_node_release
);
1484 EXPORT_SYMBOL(of_node_put
);
1487 * Plug a device node into the tree and global list.
1489 void of_attach_node(struct device_node
*np
)
1491 write_lock(&devtree_lock
);
1492 np
->sibling
= np
->parent
->child
;
1493 np
->allnext
= allnodes
;
1494 np
->parent
->child
= np
;
1496 write_unlock(&devtree_lock
);
1500 * "Unplug" a node from the device tree. The caller must hold
1501 * a reference to the node. The memory associated with the node
1502 * is not freed until its refcount goes to zero.
1504 void of_detach_node(const struct device_node
*np
)
1506 struct device_node
*parent
;
1508 write_lock(&devtree_lock
);
1510 parent
= np
->parent
;
1513 allnodes
= np
->allnext
;
1515 struct device_node
*prev
;
1516 for (prev
= allnodes
;
1517 prev
->allnext
!= np
;
1518 prev
= prev
->allnext
)
1520 prev
->allnext
= np
->allnext
;
1523 if (parent
->child
== np
)
1524 parent
->child
= np
->sibling
;
1526 struct device_node
*prevsib
;
1527 for (prevsib
= np
->parent
->child
;
1528 prevsib
->sibling
!= np
;
1529 prevsib
= prevsib
->sibling
)
1531 prevsib
->sibling
= np
->sibling
;
1534 write_unlock(&devtree_lock
);
1537 #ifdef CONFIG_PPC_PSERIES
1539 * Fix up the uninitialized fields in a new device node:
1540 * name, type and pci-specific fields
1543 static int of_finish_dynamic_node(struct device_node
*node
)
1545 struct device_node
*parent
= of_get_parent(node
);
1547 const phandle
*ibm_phandle
;
1549 node
->name
= of_get_property(node
, "name", NULL
);
1550 node
->type
= of_get_property(node
, "device_type", NULL
);
1557 /* We don't support that function on PowerMac, at least
1560 if (machine_is(powermac
))
1563 /* fix up new node's linux_phandle field */
1564 if ((ibm_phandle
= of_get_property(node
, "ibm,phandle", NULL
)))
1565 node
->linux_phandle
= *ibm_phandle
;
1568 of_node_put(parent
);
1572 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1573 unsigned long action
, void *node
)
1578 case PSERIES_RECONFIG_ADD
:
1579 err
= of_finish_dynamic_node(node
);
1581 printk(KERN_ERR
"finish_node returned %d\n", err
);
1592 static struct notifier_block prom_reconfig_nb
= {
1593 .notifier_call
= prom_reconfig_notifier
,
1594 .priority
= 10, /* This one needs to run first */
1597 static int __init
prom_reconfig_setup(void)
1599 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1601 __initcall(prom_reconfig_setup
);
1604 struct property
*of_find_property(const struct device_node
*np
,
1608 struct property
*pp
;
1610 read_lock(&devtree_lock
);
1611 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1612 if (strcmp(pp
->name
, name
) == 0) {
1617 read_unlock(&devtree_lock
);
1621 EXPORT_SYMBOL(of_find_property
);
1624 * Find a property with a given name for a given node
1625 * and return the value.
1627 const void *of_get_property(const struct device_node
*np
, const char *name
,
1630 struct property
*pp
= of_find_property(np
,name
,lenp
);
1631 return pp
? pp
->value
: NULL
;
1633 EXPORT_SYMBOL(of_get_property
);
1636 * Add a property to a node
1638 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1640 struct property
**next
;
1643 write_lock(&devtree_lock
);
1644 next
= &np
->properties
;
1646 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1647 /* duplicate ! don't insert it */
1648 write_unlock(&devtree_lock
);
1651 next
= &(*next
)->next
;
1654 write_unlock(&devtree_lock
);
1656 #ifdef CONFIG_PROC_DEVICETREE
1657 /* try to add to proc as well if it was initialized */
1659 proc_device_tree_add_prop(np
->pde
, prop
);
1660 #endif /* CONFIG_PROC_DEVICETREE */
1666 * Remove a property from a node. Note that we don't actually
1667 * remove it, since we have given out who-knows-how-many pointers
1668 * to the data using get-property. Instead we just move the property
1669 * to the "dead properties" list, so it won't be found any more.
1671 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1673 struct property
**next
;
1676 write_lock(&devtree_lock
);
1677 next
= &np
->properties
;
1679 if (*next
== prop
) {
1680 /* found the node */
1682 prop
->next
= np
->deadprops
;
1683 np
->deadprops
= prop
;
1687 next
= &(*next
)->next
;
1689 write_unlock(&devtree_lock
);
1694 #ifdef CONFIG_PROC_DEVICETREE
1695 /* try to remove the proc node as well */
1697 proc_device_tree_remove_prop(np
->pde
, prop
);
1698 #endif /* CONFIG_PROC_DEVICETREE */
1704 * Update a property in a node. Note that we don't actually
1705 * remove it, since we have given out who-knows-how-many pointers
1706 * to the data using get-property. Instead we just move the property
1707 * to the "dead properties" list, and add the new property to the
1710 int prom_update_property(struct device_node
*np
,
1711 struct property
*newprop
,
1712 struct property
*oldprop
)
1714 struct property
**next
;
1717 write_lock(&devtree_lock
);
1718 next
= &np
->properties
;
1720 if (*next
== oldprop
) {
1721 /* found the node */
1722 newprop
->next
= oldprop
->next
;
1724 oldprop
->next
= np
->deadprops
;
1725 np
->deadprops
= oldprop
;
1729 next
= &(*next
)->next
;
1731 write_unlock(&devtree_lock
);
1736 #ifdef CONFIG_PROC_DEVICETREE
1737 /* try to add to proc as well if it was initialized */
1739 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1740 #endif /* CONFIG_PROC_DEVICETREE */
1746 /* Find the device node for a given logical cpu number, also returns the cpu
1747 * local thread number (index in ibm,interrupt-server#s) if relevant and
1748 * asked for (non NULL)
1750 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1753 struct device_node
*np
;
1755 hardid
= get_hard_smp_processor_id(cpu
);
1757 for_each_node_by_type(np
, "cpu") {
1759 unsigned int plen
, t
;
1761 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1762 * fallback to "reg" property and assume no threads
1764 intserv
= of_get_property(np
, "ibm,ppc-interrupt-server#s",
1766 if (intserv
== NULL
) {
1767 const u32
*reg
= of_get_property(np
, "reg", NULL
);
1770 if (*reg
== hardid
) {
1776 plen
/= sizeof(u32
);
1777 for (t
= 0; t
< plen
; t
++) {
1778 if (hardid
== intserv
[t
]) {
1788 EXPORT_SYMBOL(of_get_cpu_node
);
1791 static struct debugfs_blob_wrapper flat_dt_blob
;
1793 static int __init
export_flat_device_tree(void)
1797 d
= debugfs_create_dir("powerpc", NULL
);
1801 flat_dt_blob
.data
= initial_boot_params
;
1802 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1804 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1811 __initcall(export_flat_device_tree
);