2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/module.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
39 #include <asm/processor.h>
42 #include <asm/kdump.h>
44 #include <asm/system.h>
46 #include <asm/pgtable.h>
48 #include <asm/iommu.h>
49 #include <asm/btext.h>
50 #include <asm/sections.h>
51 #include <asm/machdep.h>
52 #include <asm/pSeries_reconfig.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/kexec.h>
55 #include <asm/system.h>
58 #define DBG(fmt...) printk(KERN_ERR fmt)
64 static int __initdata dt_root_addr_cells
;
65 static int __initdata dt_root_size_cells
;
68 int __initdata iommu_is_off
;
69 int __initdata iommu_force_on
;
70 unsigned long tce_alloc_start
, tce_alloc_end
;
76 static struct boot_param_header
*initial_boot_params __initdata
;
78 struct boot_param_header
*initial_boot_params
;
81 static struct device_node
*allnodes
= NULL
;
83 /* use when traversing tree through the allnext, child, sibling,
84 * or parent members of struct device_node.
86 static DEFINE_RWLOCK(devtree_lock
);
88 /* export that to outside world */
89 struct device_node
*of_chosen
;
91 static inline char *find_flat_dt_string(u32 offset
)
93 return ((char *)initial_boot_params
) +
94 initial_boot_params
->off_dt_strings
+ offset
;
98 * This function is used to scan the flattened device-tree, it is
99 * used to extract the memory informations at boot before we can
102 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
103 const char *uname
, int depth
,
107 unsigned long p
= ((unsigned long)initial_boot_params
) +
108 initial_boot_params
->off_dt_struct
;
113 u32 tag
= *((u32
*)p
);
117 if (tag
== OF_DT_END_NODE
) {
121 if (tag
== OF_DT_NOP
)
123 if (tag
== OF_DT_END
)
125 if (tag
== OF_DT_PROP
) {
126 u32 sz
= *((u32
*)p
);
128 if (initial_boot_params
->version
< 0x10)
129 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
134 if (tag
!= OF_DT_BEGIN_NODE
) {
135 printk(KERN_WARNING
"Invalid tag %x scanning flattened"
136 " device tree !\n", tag
);
141 p
= _ALIGN(p
+ strlen(pathp
) + 1, 4);
142 if ((*pathp
) == '/') {
144 for (lp
= NULL
, np
= pathp
; *np
; np
++)
150 rc
= it(p
, pathp
, depth
, data
);
158 unsigned long __init
of_get_flat_dt_root(void)
160 unsigned long p
= ((unsigned long)initial_boot_params
) +
161 initial_boot_params
->off_dt_struct
;
163 while(*((u32
*)p
) == OF_DT_NOP
)
165 BUG_ON (*((u32
*)p
) != OF_DT_BEGIN_NODE
);
167 return _ALIGN(p
+ strlen((char *)p
) + 1, 4);
171 * This function can be used within scan_flattened_dt callback to get
172 * access to properties
174 void* __init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
177 unsigned long p
= node
;
180 u32 tag
= *((u32
*)p
);
185 if (tag
== OF_DT_NOP
)
187 if (tag
!= OF_DT_PROP
)
191 noff
= *((u32
*)(p
+ 4));
193 if (initial_boot_params
->version
< 0x10)
194 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
196 nstr
= find_flat_dt_string(noff
);
198 printk(KERN_WARNING
"Can't find property index"
202 if (strcmp(name
, nstr
) == 0) {
212 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
215 unsigned long cplen
, l
;
217 cp
= of_get_flat_dt_prop(node
, "compatible", &cplen
);
221 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
231 static void *__init
unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
236 *mem
= _ALIGN(*mem
, align
);
243 static unsigned long __init
unflatten_dt_node(unsigned long mem
,
245 struct device_node
*dad
,
246 struct device_node
***allnextpp
,
247 unsigned long fpsize
)
249 struct device_node
*np
;
250 struct property
*pp
, **prev_pp
= NULL
;
253 unsigned int l
, allocl
;
257 tag
= *((u32
*)(*p
));
258 if (tag
!= OF_DT_BEGIN_NODE
) {
259 printk("Weird tag at start of node: %x\n", tag
);
264 l
= allocl
= strlen(pathp
) + 1;
265 *p
= _ALIGN(*p
+ l
, 4);
267 /* version 0x10 has a more compact unit name here instead of the full
268 * path. we accumulate the full path size using "fpsize", we'll rebuild
269 * it later. We detect this because the first character of the name is
272 if ((*pathp
) != '/') {
275 /* root node: special case. fpsize accounts for path
276 * plus terminating zero. root node only has '/', so
277 * fpsize should be 2, but we want to avoid the first
278 * level nodes to have two '/' so we use fpsize 1 here
283 /* account for '/' and path size minus terminal 0
292 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
293 __alignof__(struct device_node
));
295 memset(np
, 0, sizeof(*np
));
296 np
->full_name
= ((char*)np
) + sizeof(struct device_node
);
298 char *p
= np
->full_name
;
299 /* rebuild full path for new format */
300 if (dad
&& dad
->parent
) {
301 strcpy(p
, dad
->full_name
);
303 if ((strlen(p
) + l
+ 1) != allocl
) {
304 DBG("%s: p: %d, l: %d, a: %d\n",
305 pathp
, (int)strlen(p
), l
, allocl
);
313 memcpy(np
->full_name
, pathp
, l
);
314 prev_pp
= &np
->properties
;
316 *allnextpp
= &np
->allnext
;
319 /* we temporarily use the next field as `last_child'*/
323 dad
->next
->sibling
= np
;
326 kref_init(&np
->kref
);
332 tag
= *((u32
*)(*p
));
333 if (tag
== OF_DT_NOP
) {
337 if (tag
!= OF_DT_PROP
)
341 noff
= *((u32
*)((*p
) + 4));
343 if (initial_boot_params
->version
< 0x10)
344 *p
= _ALIGN(*p
, sz
>= 8 ? 8 : 4);
346 pname
= find_flat_dt_string(noff
);
348 printk("Can't find property name in list !\n");
351 if (strcmp(pname
, "name") == 0)
353 l
= strlen(pname
) + 1;
354 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
355 __alignof__(struct property
));
357 if (strcmp(pname
, "linux,phandle") == 0) {
358 np
->node
= *((u32
*)*p
);
359 if (np
->linux_phandle
== 0)
360 np
->linux_phandle
= np
->node
;
362 if (strcmp(pname
, "ibm,phandle") == 0)
363 np
->linux_phandle
= *((u32
*)*p
);
366 pp
->value
= (void *)*p
;
370 *p
= _ALIGN((*p
) + sz
, 4);
372 /* with version 0x10 we may not have the name property, recreate
373 * it here from the unit name if absent
376 char *p
= pathp
, *ps
= pathp
, *pa
= NULL
;
389 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
390 __alignof__(struct property
));
397 memcpy(pp
->value
, ps
, sz
- 1);
398 ((char *)pp
->value
)[sz
- 1] = 0;
399 DBG("fixed up name for %s -> %s\n", pathp
,
405 np
->name
= of_get_property(np
, "name", NULL
);
406 np
->type
= of_get_property(np
, "device_type", NULL
);
413 while (tag
== OF_DT_BEGIN_NODE
) {
414 mem
= unflatten_dt_node(mem
, p
, np
, allnextpp
, fpsize
);
415 tag
= *((u32
*)(*p
));
417 if (tag
!= OF_DT_END_NODE
) {
418 printk("Weird tag at end of node: %x\n", tag
);
425 static int __init
early_parse_mem(char *p
)
430 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
431 DBG("memory limit = 0x%lx\n", memory_limit
);
435 early_param("mem", early_parse_mem
);
438 * The device tree may be allocated below our memory limit, or inside the
439 * crash kernel region for kdump. If so, move it out now.
441 static void move_device_tree(void)
443 unsigned long start
, size
;
446 DBG("-> move_device_tree\n");
448 start
= __pa(initial_boot_params
);
449 size
= initial_boot_params
->totalsize
;
451 if ((memory_limit
&& (start
+ size
) > memory_limit
) ||
452 overlaps_crashkernel(start
, size
)) {
453 p
= __va(lmb_alloc_base(size
, PAGE_SIZE
, lmb
.rmo_size
));
454 memcpy(p
, initial_boot_params
, size
);
455 initial_boot_params
= (struct boot_param_header
*)p
;
456 DBG("Moved device tree to 0x%p\n", p
);
459 DBG("<- move_device_tree\n");
463 * unflattens the device-tree passed by the firmware, creating the
464 * tree of struct device_node. It also fills the "name" and "type"
465 * pointers of the nodes so the normal device-tree walking functions
466 * can be used (this used to be done by finish_device_tree)
468 void __init
unflatten_device_tree(void)
470 unsigned long start
, mem
, size
;
471 struct device_node
**allnextp
= &allnodes
;
473 DBG(" -> unflatten_device_tree()\n");
475 /* First pass, scan for size */
476 start
= ((unsigned long)initial_boot_params
) +
477 initial_boot_params
->off_dt_struct
;
478 size
= unflatten_dt_node(0, &start
, NULL
, NULL
, 0);
479 size
= (size
| 3) + 1;
481 DBG(" size is %lx, allocating...\n", size
);
483 /* Allocate memory for the expanded device tree */
484 mem
= lmb_alloc(size
+ 4, __alignof__(struct device_node
));
485 mem
= (unsigned long) __va(mem
);
487 ((u32
*)mem
)[size
/ 4] = 0xdeadbeef;
489 DBG(" unflattening %lx...\n", mem
);
491 /* Second pass, do actual unflattening */
492 start
= ((unsigned long)initial_boot_params
) +
493 initial_boot_params
->off_dt_struct
;
494 unflatten_dt_node(mem
, &start
, NULL
, &allnextp
, 0);
495 if (*((u32
*)start
) != OF_DT_END
)
496 printk(KERN_WARNING
"Weird tag at end of tree: %08x\n", *((u32
*)start
));
497 if (((u32
*)mem
)[size
/ 4] != 0xdeadbeef)
498 printk(KERN_WARNING
"End of tree marker overwritten: %08x\n",
499 ((u32
*)mem
)[size
/ 4] );
502 /* Get pointer to OF "/chosen" node for use everywhere */
503 of_chosen
= of_find_node_by_path("/chosen");
504 if (of_chosen
== NULL
)
505 of_chosen
= of_find_node_by_path("/chosen@0");
507 DBG(" <- unflatten_device_tree()\n");
511 * ibm,pa-features is a per-cpu property that contains a string of
512 * attribute descriptors, each of which has a 2 byte header plus up
513 * to 254 bytes worth of processor attribute bits. First header
514 * byte specifies the number of bytes following the header.
515 * Second header byte is an "attribute-specifier" type, of which
516 * zero is the only currently-defined value.
517 * Implementation: Pass in the byte and bit offset for the feature
518 * that we are interested in. The function will return -1 if the
519 * pa-features property is missing, or a 1/0 to indicate if the feature
520 * is supported/not supported. Note that the bit numbers are
521 * big-endian to match the definition in PAPR.
523 static struct ibm_pa_feature
{
524 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
525 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
526 unsigned char pabyte
; /* byte number in ibm,pa-features */
527 unsigned char pabit
; /* bit number (big-endian) */
528 unsigned char invert
; /* if 1, pa bit set => clear feature */
529 } ibm_pa_features
[] __initdata
= {
530 {0, PPC_FEATURE_HAS_MMU
, 0, 0, 0},
531 {0, PPC_FEATURE_HAS_FPU
, 0, 1, 0},
532 {CPU_FTR_SLB
, 0, 0, 2, 0},
533 {CPU_FTR_CTRL
, 0, 0, 3, 0},
534 {CPU_FTR_NOEXECUTE
, 0, 0, 6, 0},
535 {CPU_FTR_NODSISRALIGN
, 0, 1, 1, 1},
537 /* put this back once we know how to test if firmware does 64k IO */
538 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
540 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
543 static void __init
scan_features(unsigned long node
, unsigned char *ftrs
,
544 unsigned long tablelen
,
545 struct ibm_pa_feature
*fp
,
546 unsigned long ft_size
)
548 unsigned long i
, len
, bit
;
550 /* find descriptor with type == 0 */
556 return; /* descriptor 0 not found */
563 /* loop over bits we know about */
564 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
565 if (fp
->pabyte
>= ftrs
[0])
567 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
568 if (bit
^ fp
->invert
) {
569 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
570 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
572 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
573 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
578 static void __init
check_cpu_pa_features(unsigned long node
)
580 unsigned char *pa_ftrs
;
581 unsigned long tablelen
;
583 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
587 scan_features(node
, pa_ftrs
, tablelen
,
588 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
591 static struct feature_property
{
594 unsigned long cpu_feature
;
595 unsigned long cpu_user_ftr
;
596 } feature_properties
[] __initdata
= {
597 #ifdef CONFIG_ALTIVEC
598 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
599 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
600 #endif /* CONFIG_ALTIVEC */
602 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
603 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
604 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
605 #endif /* CONFIG_PPC64 */
608 static void __init
check_cpu_feature_properties(unsigned long node
)
611 struct feature_property
*fp
= feature_properties
;
614 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
615 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
616 if (prop
&& *prop
>= fp
->min_value
) {
617 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
618 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
623 static int __init
early_init_dt_scan_cpus(unsigned long node
,
624 const char *uname
, int depth
,
627 static int logical_cpuid
= 0;
628 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
635 /* We are scanning "cpu" nodes only */
636 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
639 /* Get physical cpuid */
640 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
642 nthreads
= len
/ sizeof(int);
644 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
649 * Now see if any of these threads match our boot cpu.
650 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
652 for (i
= 0; i
< nthreads
; i
++) {
654 * version 2 of the kexec param format adds the phys cpuid of
657 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
659 initial_boot_params
->boot_cpuid_phys
) {
665 * Check if it's the boot-cpu, set it's hw index now,
666 * unfortunately this format did not support booting
667 * off secondary threads.
669 if (of_get_flat_dt_prop(node
,
670 "linux,boot-cpu", NULL
) != NULL
) {
677 /* logical cpu id is always 0 on UP kernels */
683 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
685 boot_cpuid
= logical_cpuid
;
686 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
689 * PAPR defines "logical" PVR values for cpus that
690 * meet various levels of the architecture:
691 * 0x0f000001 Architecture version 2.04
692 * 0x0f000002 Architecture version 2.05
693 * If the cpu-version property in the cpu node contains
694 * such a value, we call identify_cpu again with the
695 * logical PVR value in order to use the cpu feature
696 * bits appropriate for the architecture level.
698 * A POWER6 partition in "POWER6 architected" mode
699 * uses the 0x0f000002 PVR value; in POWER5+ mode
700 * it uses 0x0f000001.
702 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
703 if (prop
&& (*prop
& 0xff000000) == 0x0f000000)
704 identify_cpu(0, *prop
);
707 check_cpu_feature_properties(node
);
708 check_cpu_pa_features(node
);
710 #ifdef CONFIG_PPC_PSERIES
712 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
714 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
720 #ifdef CONFIG_BLK_DEV_INITRD
721 static void __init
early_init_dt_check_for_initrd(unsigned long node
)
726 DBG("Looking for initrd properties... ");
728 prop
= of_get_flat_dt_prop(node
, "linux,initrd-start", &l
);
730 initrd_start
= (unsigned long)__va(of_read_ulong(prop
, l
/4));
732 prop
= of_get_flat_dt_prop(node
, "linux,initrd-end", &l
);
734 initrd_end
= (unsigned long)
735 __va(of_read_ulong(prop
, l
/4));
736 initrd_below_start_ok
= 1;
742 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start
, initrd_end
);
745 static inline void early_init_dt_check_for_initrd(unsigned long node
)
748 #endif /* CONFIG_BLK_DEV_INITRD */
750 static int __init
early_init_dt_scan_chosen(unsigned long node
,
751 const char *uname
, int depth
, void *data
)
753 unsigned long *lprop
;
757 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
760 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
764 /* check if iommu is forced on or off */
765 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
767 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
771 /* mem=x on the command line is the preferred mechanism */
772 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
774 memory_limit
= *lprop
;
777 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
779 tce_alloc_start
= *lprop
;
780 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
782 tce_alloc_end
= *lprop
;
786 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
788 crashk_res
.start
= *lprop
;
790 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
792 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
795 early_init_dt_check_for_initrd(node
);
797 /* Retreive command line */
798 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
799 if (p
!= NULL
&& l
> 0)
800 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
802 #ifdef CONFIG_CMDLINE
803 if (p
== NULL
|| l
== 0 || (l
== 1 && (*p
) == 0))
804 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
805 #endif /* CONFIG_CMDLINE */
807 DBG("Command line is: %s\n", cmd_line
);
813 static int __init
early_init_dt_scan_root(unsigned long node
,
814 const char *uname
, int depth
, void *data
)
821 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
822 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
823 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
825 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
826 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
827 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
833 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
838 return of_read_ulong(p
, s
);
841 #ifdef CONFIG_PPC_PSERIES
843 * Interpret the ibm,dynamic-memory property in the
844 * /ibm,dynamic-reconfiguration-memory node.
845 * This contains a list of memory blocks along with NUMA affinity
848 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
852 unsigned long base
, size
, lmb_size
, flags
;
854 ls
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
855 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(cell_t
))
857 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
859 dm
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
860 if (dm
== NULL
|| l
< sizeof(cell_t
))
863 n
= *dm
++; /* number of entries */
864 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(cell_t
))
867 for (; n
!= 0; --n
) {
868 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
870 /* skip DRC index, pad, assoc. list index, flags */
872 /* skip this block if the reserved bit is set in flags (0x80)
873 or if the block is not assigned to this partition (0x8) */
874 if ((flags
& 0x80) || !(flags
& 0x8))
878 if (base
>= 0x80000000ul
)
880 if ((base
+ size
) > 0x80000000ul
)
881 size
= 0x80000000ul
- base
;
889 #define early_init_dt_scan_drconf_memory(node) 0
890 #endif /* CONFIG_PPC_PSERIES */
892 static int __init
early_init_dt_scan_memory(unsigned long node
,
893 const char *uname
, int depth
, void *data
)
895 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
899 /* Look for the ibm,dynamic-reconfiguration-memory node */
901 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
902 return early_init_dt_scan_drconf_memory(node
);
904 /* We are scanning "memory" nodes only */
907 * The longtrail doesn't have a device_type on the
908 * /memory node, so look for the node called /memory@0.
910 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
912 } else if (strcmp(type
, "memory") != 0)
915 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
917 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
921 endp
= reg
+ (l
/ sizeof(cell_t
));
923 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
924 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
926 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
927 unsigned long base
, size
;
929 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
930 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
934 DBG(" - %lx , %lx\n", base
, size
);
937 if (base
>= 0x80000000ul
)
939 if ((base
+ size
) > 0x80000000ul
)
940 size
= 0x80000000ul
- base
;
948 static void __init
early_reserve_mem(void)
952 unsigned long self_base
;
953 unsigned long self_size
;
955 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
956 initial_boot_params
->off_mem_rsvmap
);
958 /* before we do anything, lets reserve the dt blob */
959 self_base
= __pa((unsigned long)initial_boot_params
);
960 self_size
= initial_boot_params
->totalsize
;
961 lmb_reserve(self_base
, self_size
);
963 #ifdef CONFIG_BLK_DEV_INITRD
964 /* then reserve the initrd, if any */
965 if (initrd_start
&& (initrd_end
> initrd_start
))
966 lmb_reserve(__pa(initrd_start
), initrd_end
- initrd_start
);
967 #endif /* CONFIG_BLK_DEV_INITRD */
971 * Handle the case where we might be booting from an old kexec
972 * image that setup the mem_rsvmap as pairs of 32-bit values
974 if (*reserve_map
> 0xffffffffull
) {
975 u32 base_32
, size_32
;
976 u32
*reserve_map_32
= (u32
*)reserve_map
;
979 base_32
= *(reserve_map_32
++);
980 size_32
= *(reserve_map_32
++);
983 /* skip if the reservation is for the blob */
984 if (base_32
== self_base
&& size_32
== self_size
)
986 DBG("reserving: %x -> %x\n", base_32
, size_32
);
987 lmb_reserve(base_32
, size_32
);
993 base
= *(reserve_map
++);
994 size
= *(reserve_map
++);
997 DBG("reserving: %llx -> %llx\n", base
, size
);
998 lmb_reserve(base
, size
);
1002 DBG("memory reserved, lmbs :\n");
1007 void __init
early_init_devtree(void *params
)
1009 DBG(" -> early_init_devtree(%p)\n", params
);
1011 /* Setup flat device-tree pointer */
1012 initial_boot_params
= params
;
1014 #ifdef CONFIG_PPC_RTAS
1015 /* Some machines might need RTAS info for debugging, grab it now. */
1016 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
1019 /* Retrieve various informations from the /chosen node of the
1020 * device-tree, including the platform type, initrd location and
1021 * size, TCE reserve, and more ...
1023 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
1025 /* Scan memory nodes and rebuild LMBs */
1027 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
1028 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
1030 /* Save command line for /proc/cmdline and then parse parameters */
1031 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
1032 parse_early_param();
1034 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1035 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
1036 reserve_kdump_trampoline();
1037 reserve_crashkernel();
1038 early_reserve_mem();
1040 lmb_enforce_memory_limit(memory_limit
);
1043 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1045 /* We may need to relocate the flat tree, do it now.
1046 * FIXME .. and the initrd too? */
1049 DBG("Scanning CPUs ...\n");
1051 /* Retreive CPU related informations from the flat tree
1052 * (altivec support, boot CPU ID, ...)
1054 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1056 DBG(" <- early_init_devtree()\n");
1060 /** Checks if the given "compat" string matches one of the strings in
1061 * the device's "compatible" property
1063 int of_device_is_compatible(const struct device_node
*device
,
1069 cp
= of_get_property(device
, "compatible", &cplen
);
1073 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1082 EXPORT_SYMBOL(of_device_is_compatible
);
1086 * Indicates whether the root node has a given value in its
1087 * compatible property.
1089 int machine_is_compatible(const char *compat
)
1091 struct device_node
*root
;
1094 root
= of_find_node_by_path("/");
1096 rc
= of_device_is_compatible(root
, compat
);
1101 EXPORT_SYMBOL(machine_is_compatible
);
1105 * New implementation of the OF "find" APIs, return a refcounted
1106 * object, call of_node_put() when done. The device tree and list
1107 * are protected by a rw_lock.
1109 * Note that property management will need some locking as well,
1110 * this isn't dealt with yet.
1115 * of_find_node_by_name - Find a node by its "name" property
1116 * @from: The node to start searching from or NULL, the node
1117 * you pass will not be searched, only the next one
1118 * will; typically, you pass what the previous call
1119 * returned. of_node_put() will be called on it
1120 * @name: The name string to match against
1122 * Returns a node pointer with refcount incremented, use
1123 * of_node_put() on it when done.
1125 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1128 struct device_node
*np
;
1130 read_lock(&devtree_lock
);
1131 np
= from
? from
->allnext
: allnodes
;
1132 for (; np
!= NULL
; np
= np
->allnext
)
1133 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1137 read_unlock(&devtree_lock
);
1140 EXPORT_SYMBOL(of_find_node_by_name
);
1143 * of_find_node_by_type - Find a node by its "device_type" property
1144 * @from: The node to start searching from, or NULL to start searching
1145 * the entire device tree. The node you pass will not be
1146 * searched, only the next one will; typically, you pass
1147 * what the previous call returned. of_node_put() will be
1148 * called on from for you.
1149 * @type: The type string to match against
1151 * Returns a node pointer with refcount incremented, use
1152 * of_node_put() on it when done.
1154 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1157 struct device_node
*np
;
1159 read_lock(&devtree_lock
);
1160 np
= from
? from
->allnext
: allnodes
;
1161 for (; np
!= 0; np
= np
->allnext
)
1162 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1166 read_unlock(&devtree_lock
);
1169 EXPORT_SYMBOL(of_find_node_by_type
);
1172 * of_find_compatible_node - Find a node based on type and one of the
1173 * tokens in its "compatible" property
1174 * @from: The node to start searching from or NULL, the node
1175 * you pass will not be searched, only the next one
1176 * will; typically, you pass what the previous call
1177 * returned. of_node_put() will be called on it
1178 * @type: The type string to match "device_type" or NULL to ignore
1179 * @compatible: The string to match to one of the tokens in the device
1180 * "compatible" list.
1182 * Returns a node pointer with refcount incremented, use
1183 * of_node_put() on it when done.
1185 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1186 const char *type
, const char *compatible
)
1188 struct device_node
*np
;
1190 read_lock(&devtree_lock
);
1191 np
= from
? from
->allnext
: allnodes
;
1192 for (; np
!= 0; np
= np
->allnext
) {
1194 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1196 if (of_device_is_compatible(np
, compatible
) && of_node_get(np
))
1200 read_unlock(&devtree_lock
);
1203 EXPORT_SYMBOL(of_find_compatible_node
);
1206 * of_find_node_by_path - Find a node matching a full OF path
1207 * @path: The full path to match
1209 * Returns a node pointer with refcount incremented, use
1210 * of_node_put() on it when done.
1212 struct device_node
*of_find_node_by_path(const char *path
)
1214 struct device_node
*np
= allnodes
;
1216 read_lock(&devtree_lock
);
1217 for (; np
!= 0; np
= np
->allnext
) {
1218 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1222 read_unlock(&devtree_lock
);
1225 EXPORT_SYMBOL(of_find_node_by_path
);
1228 * of_find_node_by_phandle - Find a node given a phandle
1229 * @handle: phandle of the node to find
1231 * Returns a node pointer with refcount incremented, use
1232 * of_node_put() on it when done.
1234 struct device_node
*of_find_node_by_phandle(phandle handle
)
1236 struct device_node
*np
;
1238 read_lock(&devtree_lock
);
1239 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1240 if (np
->linux_phandle
== handle
)
1243 read_unlock(&devtree_lock
);
1246 EXPORT_SYMBOL(of_find_node_by_phandle
);
1249 * of_find_all_nodes - Get next node in global list
1250 * @prev: Previous node or NULL to start iteration
1251 * of_node_put() will be called on it
1253 * Returns a node pointer with refcount incremented, use
1254 * of_node_put() on it when done.
1256 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1258 struct device_node
*np
;
1260 read_lock(&devtree_lock
);
1261 np
= prev
? prev
->allnext
: allnodes
;
1262 for (; np
!= 0; np
= np
->allnext
)
1263 if (of_node_get(np
))
1266 read_unlock(&devtree_lock
);
1269 EXPORT_SYMBOL(of_find_all_nodes
);
1272 * of_get_parent - Get a node's parent if any
1273 * @node: Node to get parent
1275 * Returns a node pointer with refcount incremented, use
1276 * of_node_put() on it when done.
1278 struct device_node
*of_get_parent(const struct device_node
*node
)
1280 struct device_node
*np
;
1285 read_lock(&devtree_lock
);
1286 np
= of_node_get(node
->parent
);
1287 read_unlock(&devtree_lock
);
1290 EXPORT_SYMBOL(of_get_parent
);
1293 * of_get_next_child - Iterate a node childs
1294 * @node: parent node
1295 * @prev: previous child of the parent node, or NULL to get first
1297 * Returns a node pointer with refcount incremented, use
1298 * of_node_put() on it when done.
1300 struct device_node
*of_get_next_child(const struct device_node
*node
,
1301 struct device_node
*prev
)
1303 struct device_node
*next
;
1305 read_lock(&devtree_lock
);
1306 next
= prev
? prev
->sibling
: node
->child
;
1307 for (; next
!= 0; next
= next
->sibling
)
1308 if (of_node_get(next
))
1311 read_unlock(&devtree_lock
);
1314 EXPORT_SYMBOL(of_get_next_child
);
1317 * of_node_get - Increment refcount of a node
1318 * @node: Node to inc refcount, NULL is supported to
1319 * simplify writing of callers
1323 struct device_node
*of_node_get(struct device_node
*node
)
1326 kref_get(&node
->kref
);
1329 EXPORT_SYMBOL(of_node_get
);
1331 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1333 return container_of(kref
, struct device_node
, kref
);
1337 * of_node_release - release a dynamically allocated node
1338 * @kref: kref element of the node to be released
1340 * In of_node_put() this function is passed to kref_put()
1341 * as the destructor.
1343 static void of_node_release(struct kref
*kref
)
1345 struct device_node
*node
= kref_to_device_node(kref
);
1346 struct property
*prop
= node
->properties
;
1348 /* We should never be releasing nodes that haven't been detached. */
1349 if (!of_node_check_flag(node
, OF_DETACHED
)) {
1350 printk("WARNING: Bad of_node_put() on %s\n", node
->full_name
);
1352 kref_init(&node
->kref
);
1356 if (!of_node_check_flag(node
, OF_DYNAMIC
))
1360 struct property
*next
= prop
->next
;
1367 prop
= node
->deadprops
;
1368 node
->deadprops
= NULL
;
1371 kfree(node
->full_name
);
1377 * of_node_put - Decrement refcount of a node
1378 * @node: Node to dec refcount, NULL is supported to
1379 * simplify writing of callers
1382 void of_node_put(struct device_node
*node
)
1385 kref_put(&node
->kref
, of_node_release
);
1387 EXPORT_SYMBOL(of_node_put
);
1390 * Plug a device node into the tree and global list.
1392 void of_attach_node(struct device_node
*np
)
1394 write_lock(&devtree_lock
);
1395 np
->sibling
= np
->parent
->child
;
1396 np
->allnext
= allnodes
;
1397 np
->parent
->child
= np
;
1399 write_unlock(&devtree_lock
);
1403 * "Unplug" a node from the device tree. The caller must hold
1404 * a reference to the node. The memory associated with the node
1405 * is not freed until its refcount goes to zero.
1407 void of_detach_node(const struct device_node
*np
)
1409 struct device_node
*parent
;
1411 write_lock(&devtree_lock
);
1413 parent
= np
->parent
;
1418 allnodes
= np
->allnext
;
1420 struct device_node
*prev
;
1421 for (prev
= allnodes
;
1422 prev
->allnext
!= np
;
1423 prev
= prev
->allnext
)
1425 prev
->allnext
= np
->allnext
;
1428 if (parent
->child
== np
)
1429 parent
->child
= np
->sibling
;
1431 struct device_node
*prevsib
;
1432 for (prevsib
= np
->parent
->child
;
1433 prevsib
->sibling
!= np
;
1434 prevsib
= prevsib
->sibling
)
1436 prevsib
->sibling
= np
->sibling
;
1439 of_node_set_flag(np
, OF_DETACHED
);
1442 write_unlock(&devtree_lock
);
1445 #ifdef CONFIG_PPC_PSERIES
1447 * Fix up the uninitialized fields in a new device node:
1448 * name, type and pci-specific fields
1451 static int of_finish_dynamic_node(struct device_node
*node
)
1453 struct device_node
*parent
= of_get_parent(node
);
1455 const phandle
*ibm_phandle
;
1457 node
->name
= of_get_property(node
, "name", NULL
);
1458 node
->type
= of_get_property(node
, "device_type", NULL
);
1461 node
->name
= "<NULL>";
1463 node
->type
= "<NULL>";
1470 /* We don't support that function on PowerMac, at least
1473 if (machine_is(powermac
))
1476 /* fix up new node's linux_phandle field */
1477 if ((ibm_phandle
= of_get_property(node
, "ibm,phandle", NULL
)))
1478 node
->linux_phandle
= *ibm_phandle
;
1481 of_node_put(parent
);
1485 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1486 unsigned long action
, void *node
)
1491 case PSERIES_RECONFIG_ADD
:
1492 err
= of_finish_dynamic_node(node
);
1494 printk(KERN_ERR
"finish_node returned %d\n", err
);
1505 static struct notifier_block prom_reconfig_nb
= {
1506 .notifier_call
= prom_reconfig_notifier
,
1507 .priority
= 10, /* This one needs to run first */
1510 static int __init
prom_reconfig_setup(void)
1512 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1514 __initcall(prom_reconfig_setup
);
1517 struct property
*of_find_property(const struct device_node
*np
,
1521 struct property
*pp
;
1523 read_lock(&devtree_lock
);
1524 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1525 if (strcmp(pp
->name
, name
) == 0) {
1530 read_unlock(&devtree_lock
);
1534 EXPORT_SYMBOL(of_find_property
);
1537 * Add a property to a node
1539 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1541 struct property
**next
;
1544 write_lock(&devtree_lock
);
1545 next
= &np
->properties
;
1547 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1548 /* duplicate ! don't insert it */
1549 write_unlock(&devtree_lock
);
1552 next
= &(*next
)->next
;
1555 write_unlock(&devtree_lock
);
1557 #ifdef CONFIG_PROC_DEVICETREE
1558 /* try to add to proc as well if it was initialized */
1560 proc_device_tree_add_prop(np
->pde
, prop
);
1561 #endif /* CONFIG_PROC_DEVICETREE */
1567 * Remove a property from a node. Note that we don't actually
1568 * remove it, since we have given out who-knows-how-many pointers
1569 * to the data using get-property. Instead we just move the property
1570 * to the "dead properties" list, so it won't be found any more.
1572 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1574 struct property
**next
;
1577 write_lock(&devtree_lock
);
1578 next
= &np
->properties
;
1580 if (*next
== prop
) {
1581 /* found the node */
1583 prop
->next
= np
->deadprops
;
1584 np
->deadprops
= prop
;
1588 next
= &(*next
)->next
;
1590 write_unlock(&devtree_lock
);
1595 #ifdef CONFIG_PROC_DEVICETREE
1596 /* try to remove the proc node as well */
1598 proc_device_tree_remove_prop(np
->pde
, prop
);
1599 #endif /* CONFIG_PROC_DEVICETREE */
1605 * Update a property in a node. Note that we don't actually
1606 * remove it, since we have given out who-knows-how-many pointers
1607 * to the data using get-property. Instead we just move the property
1608 * to the "dead properties" list, and add the new property to the
1611 int prom_update_property(struct device_node
*np
,
1612 struct property
*newprop
,
1613 struct property
*oldprop
)
1615 struct property
**next
;
1618 write_lock(&devtree_lock
);
1619 next
= &np
->properties
;
1621 if (*next
== oldprop
) {
1622 /* found the node */
1623 newprop
->next
= oldprop
->next
;
1625 oldprop
->next
= np
->deadprops
;
1626 np
->deadprops
= oldprop
;
1630 next
= &(*next
)->next
;
1632 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_update_prop(np
->pde
, newprop
, oldprop
);
1641 #endif /* CONFIG_PROC_DEVICETREE */
1647 /* Find the device node for a given logical cpu number, also returns the cpu
1648 * local thread number (index in ibm,interrupt-server#s) if relevant and
1649 * asked for (non NULL)
1651 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1654 struct device_node
*np
;
1656 hardid
= get_hard_smp_processor_id(cpu
);
1658 for_each_node_by_type(np
, "cpu") {
1660 unsigned int plen
, t
;
1662 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1663 * fallback to "reg" property and assume no threads
1665 intserv
= of_get_property(np
, "ibm,ppc-interrupt-server#s",
1667 if (intserv
== NULL
) {
1668 const u32
*reg
= of_get_property(np
, "reg", NULL
);
1671 if (*reg
== hardid
) {
1677 plen
/= sizeof(u32
);
1678 for (t
= 0; t
< plen
; t
++) {
1679 if (hardid
== intserv
[t
]) {
1689 EXPORT_SYMBOL(of_get_cpu_node
);
1691 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1692 static struct debugfs_blob_wrapper flat_dt_blob
;
1694 static int __init
export_flat_device_tree(void)
1698 flat_dt_blob
.data
= initial_boot_params
;
1699 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1701 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1702 powerpc_debugfs_root
, &flat_dt_blob
);
1708 __initcall(export_flat_device_tree
);