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
check_cpu_pa_features(unsigned long node
)
543 unsigned char *pa_ftrs
;
544 unsigned long len
, tablelen
, i
, bit
;
546 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
550 /* find descriptor with type == 0 */
554 len
= 2 + pa_ftrs
[0];
556 return; /* descriptor 0 not found */
563 /* loop over bits we know about */
564 for (i
= 0; i
< ARRAY_SIZE(ibm_pa_features
); ++i
) {
565 struct ibm_pa_feature
*fp
= &ibm_pa_features
[i
];
567 if (fp
->pabyte
>= pa_ftrs
[0])
569 bit
= (pa_ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
570 if (bit
^ fp
->invert
) {
571 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
572 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
574 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
575 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
580 static int __init
early_init_dt_scan_cpus(unsigned long node
,
581 const char *uname
, int depth
,
584 static int logical_cpuid
= 0;
585 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
586 #ifdef CONFIG_ALTIVEC
594 /* We are scanning "cpu" nodes only */
595 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
598 /* Get physical cpuid */
599 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
601 nthreads
= len
/ sizeof(int);
603 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
608 * Now see if any of these threads match our boot cpu.
609 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
611 for (i
= 0; i
< nthreads
; i
++) {
613 * version 2 of the kexec param format adds the phys cpuid of
616 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
618 initial_boot_params
->boot_cpuid_phys
) {
624 * Check if it's the boot-cpu, set it's hw index now,
625 * unfortunately this format did not support booting
626 * off secondary threads.
628 if (of_get_flat_dt_prop(node
,
629 "linux,boot-cpu", NULL
) != NULL
) {
636 /* logical cpu id is always 0 on UP kernels */
642 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
644 boot_cpuid
= logical_cpuid
;
645 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
648 #ifdef CONFIG_ALTIVEC
649 /* Check if we have a VMX and eventually update CPU features */
650 prop
= (u32
*)of_get_flat_dt_prop(node
, "ibm,vmx", NULL
);
651 if (prop
&& (*prop
) > 0) {
652 cur_cpu_spec
->cpu_features
|= CPU_FTR_ALTIVEC
;
653 cur_cpu_spec
->cpu_user_features
|= PPC_FEATURE_HAS_ALTIVEC
;
656 /* Same goes for Apple's "altivec" property */
657 prop
= (u32
*)of_get_flat_dt_prop(node
, "altivec", NULL
);
659 cur_cpu_spec
->cpu_features
|= CPU_FTR_ALTIVEC
;
660 cur_cpu_spec
->cpu_user_features
|= PPC_FEATURE_HAS_ALTIVEC
;
662 #endif /* CONFIG_ALTIVEC */
664 check_cpu_pa_features(node
);
666 #ifdef CONFIG_PPC_PSERIES
668 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
670 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
676 static int __init
early_init_dt_scan_chosen(unsigned long node
,
677 const char *uname
, int depth
, void *data
)
679 unsigned long *lprop
;
683 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
686 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
690 /* check if iommu is forced on or off */
691 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
693 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
697 /* mem=x on the command line is the preferred mechanism */
698 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
700 memory_limit
= *lprop
;
703 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
705 tce_alloc_start
= *lprop
;
706 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
708 tce_alloc_end
= *lprop
;
712 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
714 crashk_res
.start
= *lprop
;
716 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
718 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
721 /* Retreive command line */
722 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
723 if (p
!= NULL
&& l
> 0)
724 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
726 #ifdef CONFIG_CMDLINE
727 if (l
== 0 || (l
== 1 && (*p
) == 0))
728 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
729 #endif /* CONFIG_CMDLINE */
731 DBG("Command line is: %s\n", cmd_line
);
737 static int __init
early_init_dt_scan_root(unsigned long node
,
738 const char *uname
, int depth
, void *data
)
745 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
746 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
747 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
749 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
750 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
751 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
757 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
762 return of_read_ulong(p
, s
);
766 static int __init
early_init_dt_scan_memory(unsigned long node
,
767 const char *uname
, int depth
, void *data
)
769 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
773 /* We are scanning "memory" nodes only */
776 * The longtrail doesn't have a device_type on the
777 * /memory node, so look for the node called /memory@0.
779 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
781 } else if (strcmp(type
, "memory") != 0)
784 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
786 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
790 endp
= reg
+ (l
/ sizeof(cell_t
));
792 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
793 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
795 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
796 unsigned long base
, size
;
798 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
799 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
803 DBG(" - %lx , %lx\n", base
, size
);
806 if (base
>= 0x80000000ul
)
808 if ((base
+ size
) > 0x80000000ul
)
809 size
= 0x80000000ul
- base
;
817 static void __init
early_reserve_mem(void)
821 unsigned long self_base
;
822 unsigned long self_size
;
824 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
825 initial_boot_params
->off_mem_rsvmap
);
827 /* before we do anything, lets reserve the dt blob */
828 self_base
= __pa((unsigned long)initial_boot_params
);
829 self_size
= initial_boot_params
->totalsize
;
830 lmb_reserve(self_base
, self_size
);
834 * Handle the case where we might be booting from an old kexec
835 * image that setup the mem_rsvmap as pairs of 32-bit values
837 if (*reserve_map
> 0xffffffffull
) {
838 u32 base_32
, size_32
;
839 u32
*reserve_map_32
= (u32
*)reserve_map
;
842 base_32
= *(reserve_map_32
++);
843 size_32
= *(reserve_map_32
++);
846 /* skip if the reservation is for the blob */
847 if (base_32
== self_base
&& size_32
== self_size
)
849 DBG("reserving: %x -> %x\n", base_32
, size_32
);
850 lmb_reserve(base_32
, size_32
);
856 base
= *(reserve_map
++);
857 size
= *(reserve_map
++);
860 /* skip if the reservation is for the blob */
861 if (base
== self_base
&& size
== self_size
)
863 DBG("reserving: %llx -> %llx\n", base
, size
);
864 lmb_reserve(base
, size
);
868 DBG("memory reserved, lmbs :\n");
873 void __init
early_init_devtree(void *params
)
875 DBG(" -> early_init_devtree()\n");
877 /* Setup flat device-tree pointer */
878 initial_boot_params
= params
;
880 #ifdef CONFIG_PPC_RTAS
881 /* Some machines might need RTAS info for debugging, grab it now. */
882 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
885 /* Retrieve various informations from the /chosen node of the
886 * device-tree, including the platform type, initrd location and
887 * size, TCE reserve, and more ...
889 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
891 /* Scan memory nodes and rebuild LMBs */
893 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
894 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
896 /* Save command line for /proc/cmdline and then parse parameters */
897 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
900 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
901 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
902 reserve_kdump_trampoline();
903 reserve_crashkernel();
906 lmb_enforce_memory_limit(memory_limit
);
909 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
911 /* We may need to relocate the flat tree, do it now.
912 * FIXME .. and the initrd too? */
915 DBG("Scanning CPUs ...\n");
917 /* Retreive CPU related informations from the flat tree
918 * (altivec support, boot CPU ID, ...)
920 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
922 DBG(" <- early_init_devtree()\n");
928 prom_n_addr_cells(struct device_node
* np
)
934 ip
= get_property(np
, "#address-cells", NULL
);
937 } while (np
->parent
);
938 /* No #address-cells property for the root node, default to 1 */
941 EXPORT_SYMBOL(prom_n_addr_cells
);
944 prom_n_size_cells(struct device_node
* np
)
950 ip
= get_property(np
, "#size-cells", NULL
);
953 } while (np
->parent
);
954 /* No #size-cells property for the root node, default to 1 */
957 EXPORT_SYMBOL(prom_n_size_cells
);
960 * Construct and return a list of the device_nodes with a given name.
962 struct device_node
*find_devices(const char *name
)
964 struct device_node
*head
, **prevp
, *np
;
967 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
968 if (np
->name
!= 0 && strcasecmp(np
->name
, name
) == 0) {
976 EXPORT_SYMBOL(find_devices
);
979 * Construct and return a list of the device_nodes with a given type.
981 struct device_node
*find_type_devices(const char *type
)
983 struct device_node
*head
, **prevp
, *np
;
986 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
987 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0) {
995 EXPORT_SYMBOL(find_type_devices
);
998 * Returns all nodes linked together
1000 struct device_node
*find_all_nodes(void)
1002 struct device_node
*head
, **prevp
, *np
;
1005 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1012 EXPORT_SYMBOL(find_all_nodes
);
1014 /** Checks if the given "compat" string matches one of the strings in
1015 * the device's "compatible" property
1017 int device_is_compatible(struct device_node
*device
, const char *compat
)
1022 cp
= get_property(device
, "compatible", &cplen
);
1026 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1035 EXPORT_SYMBOL(device_is_compatible
);
1039 * Indicates whether the root node has a given value in its
1040 * compatible property.
1042 int machine_is_compatible(const char *compat
)
1044 struct device_node
*root
;
1047 root
= of_find_node_by_path("/");
1049 rc
= device_is_compatible(root
, compat
);
1054 EXPORT_SYMBOL(machine_is_compatible
);
1057 * Construct and return a list of the device_nodes with a given type
1058 * and compatible property.
1060 struct device_node
*find_compatible_devices(const char *type
,
1063 struct device_node
*head
, **prevp
, *np
;
1066 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1068 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1070 if (device_is_compatible(np
, compat
)) {
1078 EXPORT_SYMBOL(find_compatible_devices
);
1081 * Find the device_node with a given full_name.
1083 struct device_node
*find_path_device(const char *path
)
1085 struct device_node
*np
;
1087 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1088 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0)
1092 EXPORT_SYMBOL(find_path_device
);
1096 * New implementation of the OF "find" APIs, return a refcounted
1097 * object, call of_node_put() when done. The device tree and list
1098 * are protected by a rw_lock.
1100 * Note that property management will need some locking as well,
1101 * this isn't dealt with yet.
1106 * of_find_node_by_name - Find a node by its "name" property
1107 * @from: The node to start searching from or NULL, the node
1108 * you pass will not be searched, only the next one
1109 * will; typically, you pass what the previous call
1110 * returned. of_node_put() will be called on it
1111 * @name: The name string to match against
1113 * Returns a node pointer with refcount incremented, use
1114 * of_node_put() on it when done.
1116 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1119 struct device_node
*np
;
1121 read_lock(&devtree_lock
);
1122 np
= from
? from
->allnext
: allnodes
;
1123 for (; np
!= NULL
; np
= np
->allnext
)
1124 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1129 read_unlock(&devtree_lock
);
1132 EXPORT_SYMBOL(of_find_node_by_name
);
1135 * of_find_node_by_type - Find a node by its "device_type" property
1136 * @from: The node to start searching from or NULL, the node
1137 * you pass will not be searched, only the next one
1138 * will; typically, you pass what the previous call
1139 * returned. of_node_put() will be called on it
1140 * @name: The type string to match against
1142 * Returns a node pointer with refcount incremented, use
1143 * of_node_put() on it when done.
1145 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1148 struct device_node
*np
;
1150 read_lock(&devtree_lock
);
1151 np
= from
? from
->allnext
: allnodes
;
1152 for (; np
!= 0; np
= np
->allnext
)
1153 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1158 read_unlock(&devtree_lock
);
1161 EXPORT_SYMBOL(of_find_node_by_type
);
1164 * of_find_compatible_node - Find a node based on type and one of the
1165 * tokens in its "compatible" property
1166 * @from: The node to start searching from or NULL, the node
1167 * you pass will not be searched, only the next one
1168 * will; typically, you pass what the previous call
1169 * returned. of_node_put() will be called on it
1170 * @type: The type string to match "device_type" or NULL to ignore
1171 * @compatible: The string to match to one of the tokens in the device
1172 * "compatible" list.
1174 * Returns a node pointer with refcount incremented, use
1175 * of_node_put() on it when done.
1177 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1178 const char *type
, const char *compatible
)
1180 struct device_node
*np
;
1182 read_lock(&devtree_lock
);
1183 np
= from
? from
->allnext
: allnodes
;
1184 for (; np
!= 0; np
= np
->allnext
) {
1186 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1188 if (device_is_compatible(np
, compatible
) && of_node_get(np
))
1193 read_unlock(&devtree_lock
);
1196 EXPORT_SYMBOL(of_find_compatible_node
);
1199 * of_find_node_by_path - Find a node matching a full OF path
1200 * @path: The full path to match
1202 * Returns a node pointer with refcount incremented, use
1203 * of_node_put() on it when done.
1205 struct device_node
*of_find_node_by_path(const char *path
)
1207 struct device_node
*np
= allnodes
;
1209 read_lock(&devtree_lock
);
1210 for (; np
!= 0; np
= np
->allnext
) {
1211 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1215 read_unlock(&devtree_lock
);
1218 EXPORT_SYMBOL(of_find_node_by_path
);
1221 * of_find_node_by_phandle - Find a node given a phandle
1222 * @handle: phandle of the node to find
1224 * Returns a node pointer with refcount incremented, use
1225 * of_node_put() on it when done.
1227 struct device_node
*of_find_node_by_phandle(phandle handle
)
1229 struct device_node
*np
;
1231 read_lock(&devtree_lock
);
1232 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1233 if (np
->linux_phandle
== handle
)
1237 read_unlock(&devtree_lock
);
1240 EXPORT_SYMBOL(of_find_node_by_phandle
);
1243 * of_find_all_nodes - Get next node in global list
1244 * @prev: Previous node or NULL to start iteration
1245 * of_node_put() will be called on it
1247 * Returns a node pointer with refcount incremented, use
1248 * of_node_put() on it when done.
1250 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1252 struct device_node
*np
;
1254 read_lock(&devtree_lock
);
1255 np
= prev
? prev
->allnext
: allnodes
;
1256 for (; np
!= 0; np
= np
->allnext
)
1257 if (of_node_get(np
))
1261 read_unlock(&devtree_lock
);
1264 EXPORT_SYMBOL(of_find_all_nodes
);
1267 * of_get_parent - Get a node's parent if any
1268 * @node: Node to get parent
1270 * Returns a node pointer with refcount incremented, use
1271 * of_node_put() on it when done.
1273 struct device_node
*of_get_parent(const struct device_node
*node
)
1275 struct device_node
*np
;
1280 read_lock(&devtree_lock
);
1281 np
= of_node_get(node
->parent
);
1282 read_unlock(&devtree_lock
);
1285 EXPORT_SYMBOL(of_get_parent
);
1288 * of_get_next_child - Iterate a node childs
1289 * @node: parent node
1290 * @prev: previous child of the parent node, or NULL to get first
1292 * Returns a node pointer with refcount incremented, use
1293 * of_node_put() on it when done.
1295 struct device_node
*of_get_next_child(const struct device_node
*node
,
1296 struct device_node
*prev
)
1298 struct device_node
*next
;
1300 read_lock(&devtree_lock
);
1301 next
= prev
? prev
->sibling
: node
->child
;
1302 for (; next
!= 0; next
= next
->sibling
)
1303 if (of_node_get(next
))
1307 read_unlock(&devtree_lock
);
1310 EXPORT_SYMBOL(of_get_next_child
);
1313 * of_node_get - Increment refcount of a node
1314 * @node: Node to inc refcount, NULL is supported to
1315 * simplify writing of callers
1319 struct device_node
*of_node_get(struct device_node
*node
)
1322 kref_get(&node
->kref
);
1325 EXPORT_SYMBOL(of_node_get
);
1327 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1329 return container_of(kref
, struct device_node
, kref
);
1333 * of_node_release - release a dynamically allocated node
1334 * @kref: kref element of the node to be released
1336 * In of_node_put() this function is passed to kref_put()
1337 * as the destructor.
1339 static void of_node_release(struct kref
*kref
)
1341 struct device_node
*node
= kref_to_device_node(kref
);
1342 struct property
*prop
= node
->properties
;
1344 if (!OF_IS_DYNAMIC(node
))
1347 struct property
*next
= prop
->next
;
1354 prop
= node
->deadprops
;
1355 node
->deadprops
= NULL
;
1358 kfree(node
->full_name
);
1364 * of_node_put - Decrement refcount of a node
1365 * @node: Node to dec refcount, NULL is supported to
1366 * simplify writing of callers
1369 void of_node_put(struct device_node
*node
)
1372 kref_put(&node
->kref
, of_node_release
);
1374 EXPORT_SYMBOL(of_node_put
);
1377 * Plug a device node into the tree and global list.
1379 void of_attach_node(struct device_node
*np
)
1381 write_lock(&devtree_lock
);
1382 np
->sibling
= np
->parent
->child
;
1383 np
->allnext
= allnodes
;
1384 np
->parent
->child
= np
;
1386 write_unlock(&devtree_lock
);
1390 * "Unplug" a node from the device tree. The caller must hold
1391 * a reference to the node. The memory associated with the node
1392 * is not freed until its refcount goes to zero.
1394 void of_detach_node(const struct device_node
*np
)
1396 struct device_node
*parent
;
1398 write_lock(&devtree_lock
);
1400 parent
= np
->parent
;
1403 allnodes
= np
->allnext
;
1405 struct device_node
*prev
;
1406 for (prev
= allnodes
;
1407 prev
->allnext
!= np
;
1408 prev
= prev
->allnext
)
1410 prev
->allnext
= np
->allnext
;
1413 if (parent
->child
== np
)
1414 parent
->child
= np
->sibling
;
1416 struct device_node
*prevsib
;
1417 for (prevsib
= np
->parent
->child
;
1418 prevsib
->sibling
!= np
;
1419 prevsib
= prevsib
->sibling
)
1421 prevsib
->sibling
= np
->sibling
;
1424 write_unlock(&devtree_lock
);
1427 #ifdef CONFIG_PPC_PSERIES
1429 * Fix up the uninitialized fields in a new device node:
1430 * name, type and pci-specific fields
1433 static int of_finish_dynamic_node(struct device_node
*node
)
1435 struct device_node
*parent
= of_get_parent(node
);
1437 const phandle
*ibm_phandle
;
1439 node
->name
= get_property(node
, "name", NULL
);
1440 node
->type
= get_property(node
, "device_type", NULL
);
1447 /* We don't support that function on PowerMac, at least
1450 if (machine_is(powermac
))
1453 /* fix up new node's linux_phandle field */
1454 if ((ibm_phandle
= get_property(node
, "ibm,phandle", NULL
)))
1455 node
->linux_phandle
= *ibm_phandle
;
1458 of_node_put(parent
);
1462 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1463 unsigned long action
, void *node
)
1468 case PSERIES_RECONFIG_ADD
:
1469 err
= of_finish_dynamic_node(node
);
1471 printk(KERN_ERR
"finish_node returned %d\n", err
);
1482 static struct notifier_block prom_reconfig_nb
= {
1483 .notifier_call
= prom_reconfig_notifier
,
1484 .priority
= 10, /* This one needs to run first */
1487 static int __init
prom_reconfig_setup(void)
1489 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1491 __initcall(prom_reconfig_setup
);
1494 struct property
*of_find_property(struct device_node
*np
, const char *name
,
1497 struct property
*pp
;
1499 read_lock(&devtree_lock
);
1500 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1501 if (strcmp(pp
->name
, name
) == 0) {
1506 read_unlock(&devtree_lock
);
1512 * Find a property with a given name for a given node
1513 * and return the value.
1515 const void *get_property(struct device_node
*np
, const char *name
, int *lenp
)
1517 struct property
*pp
= of_find_property(np
,name
,lenp
);
1518 return pp
? pp
->value
: NULL
;
1520 EXPORT_SYMBOL(get_property
);
1523 * Add a property to a node
1525 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1527 struct property
**next
;
1530 write_lock(&devtree_lock
);
1531 next
= &np
->properties
;
1533 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1534 /* duplicate ! don't insert it */
1535 write_unlock(&devtree_lock
);
1538 next
= &(*next
)->next
;
1541 write_unlock(&devtree_lock
);
1543 #ifdef CONFIG_PROC_DEVICETREE
1544 /* try to add to proc as well if it was initialized */
1546 proc_device_tree_add_prop(np
->pde
, prop
);
1547 #endif /* CONFIG_PROC_DEVICETREE */
1553 * Remove a property from a node. Note that we don't actually
1554 * remove it, since we have given out who-knows-how-many pointers
1555 * to the data using get-property. Instead we just move the property
1556 * to the "dead properties" list, so it won't be found any more.
1558 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1560 struct property
**next
;
1563 write_lock(&devtree_lock
);
1564 next
= &np
->properties
;
1566 if (*next
== prop
) {
1567 /* found the node */
1569 prop
->next
= np
->deadprops
;
1570 np
->deadprops
= prop
;
1574 next
= &(*next
)->next
;
1576 write_unlock(&devtree_lock
);
1581 #ifdef CONFIG_PROC_DEVICETREE
1582 /* try to remove the proc node as well */
1584 proc_device_tree_remove_prop(np
->pde
, prop
);
1585 #endif /* CONFIG_PROC_DEVICETREE */
1591 * Update a property in a node. Note that we don't actually
1592 * remove it, since we have given out who-knows-how-many pointers
1593 * to the data using get-property. Instead we just move the property
1594 * to the "dead properties" list, and add the new property to the
1597 int prom_update_property(struct device_node
*np
,
1598 struct property
*newprop
,
1599 struct property
*oldprop
)
1601 struct property
**next
;
1604 write_lock(&devtree_lock
);
1605 next
= &np
->properties
;
1607 if (*next
== oldprop
) {
1608 /* found the node */
1609 newprop
->next
= oldprop
->next
;
1611 oldprop
->next
= np
->deadprops
;
1612 np
->deadprops
= oldprop
;
1616 next
= &(*next
)->next
;
1618 write_unlock(&devtree_lock
);
1623 #ifdef CONFIG_PROC_DEVICETREE
1624 /* try to add to proc as well if it was initialized */
1626 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1627 #endif /* CONFIG_PROC_DEVICETREE */
1633 /* Find the device node for a given logical cpu number, also returns the cpu
1634 * local thread number (index in ibm,interrupt-server#s) if relevant and
1635 * asked for (non NULL)
1637 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1640 struct device_node
*np
;
1642 hardid
= get_hard_smp_processor_id(cpu
);
1644 for_each_node_by_type(np
, "cpu") {
1646 unsigned int plen
, t
;
1648 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1649 * fallback to "reg" property and assume no threads
1651 intserv
= get_property(np
, "ibm,ppc-interrupt-server#s",
1653 if (intserv
== NULL
) {
1654 const u32
*reg
= get_property(np
, "reg", NULL
);
1657 if (*reg
== hardid
) {
1663 plen
/= sizeof(u32
);
1664 for (t
= 0; t
< plen
; t
++) {
1665 if (hardid
== intserv
[t
]) {
1677 static struct debugfs_blob_wrapper flat_dt_blob
;
1679 static int __init
export_flat_device_tree(void)
1683 d
= debugfs_create_dir("powerpc", NULL
);
1687 flat_dt_blob
.data
= initial_boot_params
;
1688 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1690 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1697 __initcall(export_flat_device_tree
);