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 extern struct device_node
*allnodes
; /* temporary while merging */
83 extern rwlock_t devtree_lock
; /* temporary while merging */
85 /* export that to outside world */
86 struct device_node
*of_chosen
;
88 static inline char *find_flat_dt_string(u32 offset
)
90 return ((char *)initial_boot_params
) +
91 initial_boot_params
->off_dt_strings
+ offset
;
95 * This function is used to scan the flattened device-tree, it is
96 * used to extract the memory informations at boot before we can
99 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
100 const char *uname
, int depth
,
104 unsigned long p
= ((unsigned long)initial_boot_params
) +
105 initial_boot_params
->off_dt_struct
;
110 u32 tag
= *((u32
*)p
);
114 if (tag
== OF_DT_END_NODE
) {
118 if (tag
== OF_DT_NOP
)
120 if (tag
== OF_DT_END
)
122 if (tag
== OF_DT_PROP
) {
123 u32 sz
= *((u32
*)p
);
125 if (initial_boot_params
->version
< 0x10)
126 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
131 if (tag
!= OF_DT_BEGIN_NODE
) {
132 printk(KERN_WARNING
"Invalid tag %x scanning flattened"
133 " device tree !\n", tag
);
138 p
= _ALIGN(p
+ strlen(pathp
) + 1, 4);
139 if ((*pathp
) == '/') {
141 for (lp
= NULL
, np
= pathp
; *np
; np
++)
147 rc
= it(p
, pathp
, depth
, data
);
155 unsigned long __init
of_get_flat_dt_root(void)
157 unsigned long p
= ((unsigned long)initial_boot_params
) +
158 initial_boot_params
->off_dt_struct
;
160 while(*((u32
*)p
) == OF_DT_NOP
)
162 BUG_ON (*((u32
*)p
) != OF_DT_BEGIN_NODE
);
164 return _ALIGN(p
+ strlen((char *)p
) + 1, 4);
168 * This function can be used within scan_flattened_dt callback to get
169 * access to properties
171 void* __init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
174 unsigned long p
= node
;
177 u32 tag
= *((u32
*)p
);
182 if (tag
== OF_DT_NOP
)
184 if (tag
!= OF_DT_PROP
)
188 noff
= *((u32
*)(p
+ 4));
190 if (initial_boot_params
->version
< 0x10)
191 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
193 nstr
= find_flat_dt_string(noff
);
195 printk(KERN_WARNING
"Can't find property index"
199 if (strcmp(name
, nstr
) == 0) {
209 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
212 unsigned long cplen
, l
;
214 cp
= of_get_flat_dt_prop(node
, "compatible", &cplen
);
218 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
228 static void *__init
unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
233 *mem
= _ALIGN(*mem
, align
);
240 static unsigned long __init
unflatten_dt_node(unsigned long mem
,
242 struct device_node
*dad
,
243 struct device_node
***allnextpp
,
244 unsigned long fpsize
)
246 struct device_node
*np
;
247 struct property
*pp
, **prev_pp
= NULL
;
250 unsigned int l
, allocl
;
254 tag
= *((u32
*)(*p
));
255 if (tag
!= OF_DT_BEGIN_NODE
) {
256 printk("Weird tag at start of node: %x\n", tag
);
261 l
= allocl
= strlen(pathp
) + 1;
262 *p
= _ALIGN(*p
+ l
, 4);
264 /* version 0x10 has a more compact unit name here instead of the full
265 * path. we accumulate the full path size using "fpsize", we'll rebuild
266 * it later. We detect this because the first character of the name is
269 if ((*pathp
) != '/') {
272 /* root node: special case. fpsize accounts for path
273 * plus terminating zero. root node only has '/', so
274 * fpsize should be 2, but we want to avoid the first
275 * level nodes to have two '/' so we use fpsize 1 here
280 /* account for '/' and path size minus terminal 0
289 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
290 __alignof__(struct device_node
));
292 memset(np
, 0, sizeof(*np
));
293 np
->full_name
= ((char*)np
) + sizeof(struct device_node
);
295 char *p
= np
->full_name
;
296 /* rebuild full path for new format */
297 if (dad
&& dad
->parent
) {
298 strcpy(p
, dad
->full_name
);
300 if ((strlen(p
) + l
+ 1) != allocl
) {
301 DBG("%s: p: %d, l: %d, a: %d\n",
302 pathp
, (int)strlen(p
), l
, allocl
);
310 memcpy(np
->full_name
, pathp
, l
);
311 prev_pp
= &np
->properties
;
313 *allnextpp
= &np
->allnext
;
316 /* we temporarily use the next field as `last_child'*/
320 dad
->next
->sibling
= np
;
323 kref_init(&np
->kref
);
329 tag
= *((u32
*)(*p
));
330 if (tag
== OF_DT_NOP
) {
334 if (tag
!= OF_DT_PROP
)
338 noff
= *((u32
*)((*p
) + 4));
340 if (initial_boot_params
->version
< 0x10)
341 *p
= _ALIGN(*p
, sz
>= 8 ? 8 : 4);
343 pname
= find_flat_dt_string(noff
);
345 printk("Can't find property name in list !\n");
348 if (strcmp(pname
, "name") == 0)
350 l
= strlen(pname
) + 1;
351 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
352 __alignof__(struct property
));
354 if (strcmp(pname
, "linux,phandle") == 0) {
355 np
->node
= *((u32
*)*p
);
356 if (np
->linux_phandle
== 0)
357 np
->linux_phandle
= np
->node
;
359 if (strcmp(pname
, "ibm,phandle") == 0)
360 np
->linux_phandle
= *((u32
*)*p
);
363 pp
->value
= (void *)*p
;
367 *p
= _ALIGN((*p
) + sz
, 4);
369 /* with version 0x10 we may not have the name property, recreate
370 * it here from the unit name if absent
373 char *p
= pathp
, *ps
= pathp
, *pa
= NULL
;
386 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
387 __alignof__(struct property
));
394 memcpy(pp
->value
, ps
, sz
- 1);
395 ((char *)pp
->value
)[sz
- 1] = 0;
396 DBG("fixed up name for %s -> %s\n", pathp
,
402 np
->name
= of_get_property(np
, "name", NULL
);
403 np
->type
= of_get_property(np
, "device_type", NULL
);
410 while (tag
== OF_DT_BEGIN_NODE
) {
411 mem
= unflatten_dt_node(mem
, p
, np
, allnextpp
, fpsize
);
412 tag
= *((u32
*)(*p
));
414 if (tag
!= OF_DT_END_NODE
) {
415 printk("Weird tag at end of node: %x\n", tag
);
422 static int __init
early_parse_mem(char *p
)
427 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
428 DBG("memory limit = 0x%lx\n", memory_limit
);
432 early_param("mem", early_parse_mem
);
435 * The device tree may be allocated below our memory limit, or inside the
436 * crash kernel region for kdump. If so, move it out now.
438 static void move_device_tree(void)
440 unsigned long start
, size
;
443 DBG("-> move_device_tree\n");
445 start
= __pa(initial_boot_params
);
446 size
= initial_boot_params
->totalsize
;
448 if ((memory_limit
&& (start
+ size
) > memory_limit
) ||
449 overlaps_crashkernel(start
, size
)) {
450 p
= __va(lmb_alloc_base(size
, PAGE_SIZE
, lmb
.rmo_size
));
451 memcpy(p
, initial_boot_params
, size
);
452 initial_boot_params
= (struct boot_param_header
*)p
;
453 DBG("Moved device tree to 0x%p\n", p
);
456 DBG("<- move_device_tree\n");
460 * unflattens the device-tree passed by the firmware, creating the
461 * tree of struct device_node. It also fills the "name" and "type"
462 * pointers of the nodes so the normal device-tree walking functions
463 * can be used (this used to be done by finish_device_tree)
465 void __init
unflatten_device_tree(void)
467 unsigned long start
, mem
, size
;
468 struct device_node
**allnextp
= &allnodes
;
470 DBG(" -> unflatten_device_tree()\n");
472 /* First pass, scan for size */
473 start
= ((unsigned long)initial_boot_params
) +
474 initial_boot_params
->off_dt_struct
;
475 size
= unflatten_dt_node(0, &start
, NULL
, NULL
, 0);
476 size
= (size
| 3) + 1;
478 DBG(" size is %lx, allocating...\n", size
);
480 /* Allocate memory for the expanded device tree */
481 mem
= lmb_alloc(size
+ 4, __alignof__(struct device_node
));
482 mem
= (unsigned long) __va(mem
);
484 ((u32
*)mem
)[size
/ 4] = 0xdeadbeef;
486 DBG(" unflattening %lx...\n", mem
);
488 /* Second pass, do actual unflattening */
489 start
= ((unsigned long)initial_boot_params
) +
490 initial_boot_params
->off_dt_struct
;
491 unflatten_dt_node(mem
, &start
, NULL
, &allnextp
, 0);
492 if (*((u32
*)start
) != OF_DT_END
)
493 printk(KERN_WARNING
"Weird tag at end of tree: %08x\n", *((u32
*)start
));
494 if (((u32
*)mem
)[size
/ 4] != 0xdeadbeef)
495 printk(KERN_WARNING
"End of tree marker overwritten: %08x\n",
496 ((u32
*)mem
)[size
/ 4] );
499 /* Get pointer to OF "/chosen" node for use everywhere */
500 of_chosen
= of_find_node_by_path("/chosen");
501 if (of_chosen
== NULL
)
502 of_chosen
= of_find_node_by_path("/chosen@0");
504 DBG(" <- unflatten_device_tree()\n");
508 * ibm,pa-features is a per-cpu property that contains a string of
509 * attribute descriptors, each of which has a 2 byte header plus up
510 * to 254 bytes worth of processor attribute bits. First header
511 * byte specifies the number of bytes following the header.
512 * Second header byte is an "attribute-specifier" type, of which
513 * zero is the only currently-defined value.
514 * Implementation: Pass in the byte and bit offset for the feature
515 * that we are interested in. The function will return -1 if the
516 * pa-features property is missing, or a 1/0 to indicate if the feature
517 * is supported/not supported. Note that the bit numbers are
518 * big-endian to match the definition in PAPR.
520 static struct ibm_pa_feature
{
521 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
522 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
523 unsigned char pabyte
; /* byte number in ibm,pa-features */
524 unsigned char pabit
; /* bit number (big-endian) */
525 unsigned char invert
; /* if 1, pa bit set => clear feature */
526 } ibm_pa_features
[] __initdata
= {
527 {0, PPC_FEATURE_HAS_MMU
, 0, 0, 0},
528 {0, PPC_FEATURE_HAS_FPU
, 0, 1, 0},
529 {CPU_FTR_SLB
, 0, 0, 2, 0},
530 {CPU_FTR_CTRL
, 0, 0, 3, 0},
531 {CPU_FTR_NOEXECUTE
, 0, 0, 6, 0},
532 {CPU_FTR_NODSISRALIGN
, 0, 1, 1, 1},
534 /* put this back once we know how to test if firmware does 64k IO */
535 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
537 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
540 static void __init
scan_features(unsigned long node
, unsigned char *ftrs
,
541 unsigned long tablelen
,
542 struct ibm_pa_feature
*fp
,
543 unsigned long ft_size
)
545 unsigned long i
, len
, bit
;
547 /* find descriptor with type == 0 */
553 return; /* descriptor 0 not found */
560 /* loop over bits we know about */
561 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
562 if (fp
->pabyte
>= ftrs
[0])
564 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
565 if (bit
^ fp
->invert
) {
566 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
567 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
569 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
570 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
575 static void __init
check_cpu_pa_features(unsigned long node
)
577 unsigned char *pa_ftrs
;
578 unsigned long tablelen
;
580 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
584 scan_features(node
, pa_ftrs
, tablelen
,
585 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
588 static struct feature_property
{
591 unsigned long cpu_feature
;
592 unsigned long cpu_user_ftr
;
593 } feature_properties
[] __initdata
= {
594 #ifdef CONFIG_ALTIVEC
595 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
596 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
597 #endif /* CONFIG_ALTIVEC */
599 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
600 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
601 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
602 #endif /* CONFIG_PPC64 */
605 static void __init
check_cpu_feature_properties(unsigned long node
)
608 struct feature_property
*fp
= feature_properties
;
611 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
612 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
613 if (prop
&& *prop
>= fp
->min_value
) {
614 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
615 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
620 static int __init
early_init_dt_scan_cpus(unsigned long node
,
621 const char *uname
, int depth
,
624 static int logical_cpuid
= 0;
625 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
632 /* We are scanning "cpu" nodes only */
633 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
636 /* Get physical cpuid */
637 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
639 nthreads
= len
/ sizeof(int);
641 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
646 * Now see if any of these threads match our boot cpu.
647 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
649 for (i
= 0; i
< nthreads
; i
++) {
651 * version 2 of the kexec param format adds the phys cpuid of
654 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
656 initial_boot_params
->boot_cpuid_phys
) {
662 * Check if it's the boot-cpu, set it's hw index now,
663 * unfortunately this format did not support booting
664 * off secondary threads.
666 if (of_get_flat_dt_prop(node
,
667 "linux,boot-cpu", NULL
) != NULL
) {
674 /* logical cpu id is always 0 on UP kernels */
680 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
682 boot_cpuid
= logical_cpuid
;
683 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
686 * PAPR defines "logical" PVR values for cpus that
687 * meet various levels of the architecture:
688 * 0x0f000001 Architecture version 2.04
689 * 0x0f000002 Architecture version 2.05
690 * If the cpu-version property in the cpu node contains
691 * such a value, we call identify_cpu again with the
692 * logical PVR value in order to use the cpu feature
693 * bits appropriate for the architecture level.
695 * A POWER6 partition in "POWER6 architected" mode
696 * uses the 0x0f000002 PVR value; in POWER5+ mode
697 * it uses 0x0f000001.
699 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
700 if (prop
&& (*prop
& 0xff000000) == 0x0f000000)
701 identify_cpu(0, *prop
);
704 check_cpu_feature_properties(node
);
705 check_cpu_pa_features(node
);
707 #ifdef CONFIG_PPC_PSERIES
709 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
711 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
717 #ifdef CONFIG_BLK_DEV_INITRD
718 static void __init
early_init_dt_check_for_initrd(unsigned long node
)
723 DBG("Looking for initrd properties... ");
725 prop
= of_get_flat_dt_prop(node
, "linux,initrd-start", &l
);
727 initrd_start
= (unsigned long)__va(of_read_ulong(prop
, l
/4));
729 prop
= of_get_flat_dt_prop(node
, "linux,initrd-end", &l
);
731 initrd_end
= (unsigned long)
732 __va(of_read_ulong(prop
, l
/4));
733 initrd_below_start_ok
= 1;
739 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start
, initrd_end
);
742 static inline void early_init_dt_check_for_initrd(unsigned long node
)
745 #endif /* CONFIG_BLK_DEV_INITRD */
747 static int __init
early_init_dt_scan_chosen(unsigned long node
,
748 const char *uname
, int depth
, void *data
)
750 unsigned long *lprop
;
754 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
757 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
761 /* check if iommu is forced on or off */
762 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
764 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
768 /* mem=x on the command line is the preferred mechanism */
769 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
771 memory_limit
= *lprop
;
774 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
776 tce_alloc_start
= *lprop
;
777 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
779 tce_alloc_end
= *lprop
;
783 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
785 crashk_res
.start
= *lprop
;
787 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
789 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
792 early_init_dt_check_for_initrd(node
);
794 /* Retreive command line */
795 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
796 if (p
!= NULL
&& l
> 0)
797 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
799 #ifdef CONFIG_CMDLINE
800 if (p
== NULL
|| l
== 0 || (l
== 1 && (*p
) == 0))
801 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
802 #endif /* CONFIG_CMDLINE */
804 DBG("Command line is: %s\n", cmd_line
);
810 static int __init
early_init_dt_scan_root(unsigned long node
,
811 const char *uname
, int depth
, void *data
)
818 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
819 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
820 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
822 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
823 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
824 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
830 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
835 return of_read_ulong(p
, s
);
838 #ifdef CONFIG_PPC_PSERIES
840 * Interpret the ibm,dynamic-memory property in the
841 * /ibm,dynamic-reconfiguration-memory node.
842 * This contains a list of memory blocks along with NUMA affinity
845 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
849 unsigned long base
, size
, lmb_size
, flags
;
851 ls
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
852 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(cell_t
))
854 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
856 dm
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
857 if (dm
== NULL
|| l
< sizeof(cell_t
))
860 n
= *dm
++; /* number of entries */
861 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(cell_t
))
864 for (; n
!= 0; --n
) {
865 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
867 /* skip DRC index, pad, assoc. list index, flags */
869 /* skip this block if the reserved bit is set in flags (0x80)
870 or if the block is not assigned to this partition (0x8) */
871 if ((flags
& 0x80) || !(flags
& 0x8))
875 if (base
>= 0x80000000ul
)
877 if ((base
+ size
) > 0x80000000ul
)
878 size
= 0x80000000ul
- base
;
886 #define early_init_dt_scan_drconf_memory(node) 0
887 #endif /* CONFIG_PPC_PSERIES */
889 static int __init
early_init_dt_scan_memory(unsigned long node
,
890 const char *uname
, int depth
, void *data
)
892 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
896 /* Look for the ibm,dynamic-reconfiguration-memory node */
898 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
899 return early_init_dt_scan_drconf_memory(node
);
901 /* We are scanning "memory" nodes only */
904 * The longtrail doesn't have a device_type on the
905 * /memory node, so look for the node called /memory@0.
907 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
909 } else if (strcmp(type
, "memory") != 0)
912 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
914 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
918 endp
= reg
+ (l
/ sizeof(cell_t
));
920 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
921 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
923 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
924 unsigned long base
, size
;
926 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
927 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
931 DBG(" - %lx , %lx\n", base
, size
);
934 if (base
>= 0x80000000ul
)
936 if ((base
+ size
) > 0x80000000ul
)
937 size
= 0x80000000ul
- base
;
945 static void __init
early_reserve_mem(void)
949 unsigned long self_base
;
950 unsigned long self_size
;
952 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
953 initial_boot_params
->off_mem_rsvmap
);
955 /* before we do anything, lets reserve the dt blob */
956 self_base
= __pa((unsigned long)initial_boot_params
);
957 self_size
= initial_boot_params
->totalsize
;
958 lmb_reserve(self_base
, self_size
);
960 #ifdef CONFIG_BLK_DEV_INITRD
961 /* then reserve the initrd, if any */
962 if (initrd_start
&& (initrd_end
> initrd_start
))
963 lmb_reserve(__pa(initrd_start
), initrd_end
- initrd_start
);
964 #endif /* CONFIG_BLK_DEV_INITRD */
968 * Handle the case where we might be booting from an old kexec
969 * image that setup the mem_rsvmap as pairs of 32-bit values
971 if (*reserve_map
> 0xffffffffull
) {
972 u32 base_32
, size_32
;
973 u32
*reserve_map_32
= (u32
*)reserve_map
;
976 base_32
= *(reserve_map_32
++);
977 size_32
= *(reserve_map_32
++);
980 /* skip if the reservation is for the blob */
981 if (base_32
== self_base
&& size_32
== self_size
)
983 DBG("reserving: %x -> %x\n", base_32
, size_32
);
984 lmb_reserve(base_32
, size_32
);
990 base
= *(reserve_map
++);
991 size
= *(reserve_map
++);
994 DBG("reserving: %llx -> %llx\n", base
, size
);
995 lmb_reserve(base
, size
);
999 DBG("memory reserved, lmbs :\n");
1004 void __init
early_init_devtree(void *params
)
1006 DBG(" -> early_init_devtree(%p)\n", params
);
1008 /* Setup flat device-tree pointer */
1009 initial_boot_params
= params
;
1011 #ifdef CONFIG_PPC_RTAS
1012 /* Some machines might need RTAS info for debugging, grab it now. */
1013 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
1016 /* Retrieve various informations from the /chosen node of the
1017 * device-tree, including the platform type, initrd location and
1018 * size, TCE reserve, and more ...
1020 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
1022 /* Scan memory nodes and rebuild LMBs */
1024 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
1025 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
1027 /* Save command line for /proc/cmdline and then parse parameters */
1028 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
1029 parse_early_param();
1031 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1032 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
1033 reserve_kdump_trampoline();
1034 reserve_crashkernel();
1035 early_reserve_mem();
1037 lmb_enforce_memory_limit(memory_limit
);
1040 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1042 /* We may need to relocate the flat tree, do it now.
1043 * FIXME .. and the initrd too? */
1046 DBG("Scanning CPUs ...\n");
1048 /* Retreive CPU related informations from the flat tree
1049 * (altivec support, boot CPU ID, ...)
1051 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1053 DBG(" <- early_init_devtree()\n");
1058 * Indicates whether the root node has a given value in its
1059 * compatible property.
1061 int machine_is_compatible(const char *compat
)
1063 struct device_node
*root
;
1066 root
= of_find_node_by_path("/");
1068 rc
= of_device_is_compatible(root
, compat
);
1073 EXPORT_SYMBOL(machine_is_compatible
);
1077 * New implementation of the OF "find" APIs, return a refcounted
1078 * object, call of_node_put() when done. The device tree and list
1079 * are protected by a rw_lock.
1081 * Note that property management will need some locking as well,
1082 * this isn't dealt with yet.
1087 * of_find_node_by_phandle - Find a node given a phandle
1088 * @handle: phandle of the node to find
1090 * Returns a node pointer with refcount incremented, use
1091 * of_node_put() on it when done.
1093 struct device_node
*of_find_node_by_phandle(phandle handle
)
1095 struct device_node
*np
;
1097 read_lock(&devtree_lock
);
1098 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1099 if (np
->linux_phandle
== handle
)
1102 read_unlock(&devtree_lock
);
1105 EXPORT_SYMBOL(of_find_node_by_phandle
);
1108 * of_find_all_nodes - Get next node in global list
1109 * @prev: Previous node or NULL to start iteration
1110 * of_node_put() will be called on it
1112 * Returns a node pointer with refcount incremented, use
1113 * of_node_put() on it when done.
1115 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1117 struct device_node
*np
;
1119 read_lock(&devtree_lock
);
1120 np
= prev
? prev
->allnext
: allnodes
;
1121 for (; np
!= 0; np
= np
->allnext
)
1122 if (of_node_get(np
))
1125 read_unlock(&devtree_lock
);
1128 EXPORT_SYMBOL(of_find_all_nodes
);
1131 * of_node_get - Increment refcount of a node
1132 * @node: Node to inc refcount, NULL is supported to
1133 * simplify writing of callers
1137 struct device_node
*of_node_get(struct device_node
*node
)
1140 kref_get(&node
->kref
);
1143 EXPORT_SYMBOL(of_node_get
);
1145 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1147 return container_of(kref
, struct device_node
, kref
);
1151 * of_node_release - release a dynamically allocated node
1152 * @kref: kref element of the node to be released
1154 * In of_node_put() this function is passed to kref_put()
1155 * as the destructor.
1157 static void of_node_release(struct kref
*kref
)
1159 struct device_node
*node
= kref_to_device_node(kref
);
1160 struct property
*prop
= node
->properties
;
1162 /* We should never be releasing nodes that haven't been detached. */
1163 if (!of_node_check_flag(node
, OF_DETACHED
)) {
1164 printk("WARNING: Bad of_node_put() on %s\n", node
->full_name
);
1166 kref_init(&node
->kref
);
1170 if (!of_node_check_flag(node
, OF_DYNAMIC
))
1174 struct property
*next
= prop
->next
;
1181 prop
= node
->deadprops
;
1182 node
->deadprops
= NULL
;
1185 kfree(node
->full_name
);
1191 * of_node_put - Decrement refcount of a node
1192 * @node: Node to dec refcount, NULL is supported to
1193 * simplify writing of callers
1196 void of_node_put(struct device_node
*node
)
1199 kref_put(&node
->kref
, of_node_release
);
1201 EXPORT_SYMBOL(of_node_put
);
1204 * Plug a device node into the tree and global list.
1206 void of_attach_node(struct device_node
*np
)
1208 write_lock(&devtree_lock
);
1209 np
->sibling
= np
->parent
->child
;
1210 np
->allnext
= allnodes
;
1211 np
->parent
->child
= np
;
1213 write_unlock(&devtree_lock
);
1217 * "Unplug" a node from the device tree. The caller must hold
1218 * a reference to the node. The memory associated with the node
1219 * is not freed until its refcount goes to zero.
1221 void of_detach_node(const struct device_node
*np
)
1223 struct device_node
*parent
;
1225 write_lock(&devtree_lock
);
1227 parent
= np
->parent
;
1232 allnodes
= np
->allnext
;
1234 struct device_node
*prev
;
1235 for (prev
= allnodes
;
1236 prev
->allnext
!= np
;
1237 prev
= prev
->allnext
)
1239 prev
->allnext
= np
->allnext
;
1242 if (parent
->child
== np
)
1243 parent
->child
= np
->sibling
;
1245 struct device_node
*prevsib
;
1246 for (prevsib
= np
->parent
->child
;
1247 prevsib
->sibling
!= np
;
1248 prevsib
= prevsib
->sibling
)
1250 prevsib
->sibling
= np
->sibling
;
1253 of_node_set_flag(np
, OF_DETACHED
);
1256 write_unlock(&devtree_lock
);
1259 #ifdef CONFIG_PPC_PSERIES
1261 * Fix up the uninitialized fields in a new device node:
1262 * name, type and pci-specific fields
1265 static int of_finish_dynamic_node(struct device_node
*node
)
1267 struct device_node
*parent
= of_get_parent(node
);
1269 const phandle
*ibm_phandle
;
1271 node
->name
= of_get_property(node
, "name", NULL
);
1272 node
->type
= of_get_property(node
, "device_type", NULL
);
1275 node
->name
= "<NULL>";
1277 node
->type
= "<NULL>";
1284 /* We don't support that function on PowerMac, at least
1287 if (machine_is(powermac
))
1290 /* fix up new node's linux_phandle field */
1291 if ((ibm_phandle
= of_get_property(node
, "ibm,phandle", NULL
)))
1292 node
->linux_phandle
= *ibm_phandle
;
1295 of_node_put(parent
);
1299 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1300 unsigned long action
, void *node
)
1305 case PSERIES_RECONFIG_ADD
:
1306 err
= of_finish_dynamic_node(node
);
1308 printk(KERN_ERR
"finish_node returned %d\n", err
);
1319 static struct notifier_block prom_reconfig_nb
= {
1320 .notifier_call
= prom_reconfig_notifier
,
1321 .priority
= 10, /* This one needs to run first */
1324 static int __init
prom_reconfig_setup(void)
1326 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1328 __initcall(prom_reconfig_setup
);
1332 * Add a property to a node
1334 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1336 struct property
**next
;
1339 write_lock(&devtree_lock
);
1340 next
= &np
->properties
;
1342 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1343 /* duplicate ! don't insert it */
1344 write_unlock(&devtree_lock
);
1347 next
= &(*next
)->next
;
1350 write_unlock(&devtree_lock
);
1352 #ifdef CONFIG_PROC_DEVICETREE
1353 /* try to add to proc as well if it was initialized */
1355 proc_device_tree_add_prop(np
->pde
, prop
);
1356 #endif /* CONFIG_PROC_DEVICETREE */
1362 * Remove a property from a node. Note that we don't actually
1363 * remove it, since we have given out who-knows-how-many pointers
1364 * to the data using get-property. Instead we just move the property
1365 * to the "dead properties" list, so it won't be found any more.
1367 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1369 struct property
**next
;
1372 write_lock(&devtree_lock
);
1373 next
= &np
->properties
;
1375 if (*next
== prop
) {
1376 /* found the node */
1378 prop
->next
= np
->deadprops
;
1379 np
->deadprops
= prop
;
1383 next
= &(*next
)->next
;
1385 write_unlock(&devtree_lock
);
1390 #ifdef CONFIG_PROC_DEVICETREE
1391 /* try to remove the proc node as well */
1393 proc_device_tree_remove_prop(np
->pde
, prop
);
1394 #endif /* CONFIG_PROC_DEVICETREE */
1400 * Update a property in a node. Note that we don't actually
1401 * remove it, since we have given out who-knows-how-many pointers
1402 * to the data using get-property. Instead we just move the property
1403 * to the "dead properties" list, and add the new property to the
1406 int prom_update_property(struct device_node
*np
,
1407 struct property
*newprop
,
1408 struct property
*oldprop
)
1410 struct property
**next
;
1413 write_lock(&devtree_lock
);
1414 next
= &np
->properties
;
1416 if (*next
== oldprop
) {
1417 /* found the node */
1418 newprop
->next
= oldprop
->next
;
1420 oldprop
->next
= np
->deadprops
;
1421 np
->deadprops
= oldprop
;
1425 next
= &(*next
)->next
;
1427 write_unlock(&devtree_lock
);
1432 #ifdef CONFIG_PROC_DEVICETREE
1433 /* try to add to proc as well if it was initialized */
1435 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1436 #endif /* CONFIG_PROC_DEVICETREE */
1442 /* Find the device node for a given logical cpu number, also returns the cpu
1443 * local thread number (index in ibm,interrupt-server#s) if relevant and
1444 * asked for (non NULL)
1446 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1449 struct device_node
*np
;
1451 hardid
= get_hard_smp_processor_id(cpu
);
1453 for_each_node_by_type(np
, "cpu") {
1455 unsigned int plen
, t
;
1457 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1458 * fallback to "reg" property and assume no threads
1460 intserv
= of_get_property(np
, "ibm,ppc-interrupt-server#s",
1462 if (intserv
== NULL
) {
1463 const u32
*reg
= of_get_property(np
, "reg", NULL
);
1466 if (*reg
== hardid
) {
1472 plen
/= sizeof(u32
);
1473 for (t
= 0; t
< plen
; t
++) {
1474 if (hardid
== intserv
[t
]) {
1484 EXPORT_SYMBOL(of_get_cpu_node
);
1486 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1487 static struct debugfs_blob_wrapper flat_dt_blob
;
1489 static int __init
export_flat_device_tree(void)
1493 flat_dt_blob
.data
= initial_boot_params
;
1494 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1496 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1497 powerpc_debugfs_root
, &flat_dt_blob
);
1503 __initcall(export_flat_device_tree
);