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>
38 #include <asm/processor.h>
41 #include <asm/kdump.h>
43 #include <asm/system.h>
45 #include <asm/pgtable.h>
47 #include <asm/iommu.h>
48 #include <asm/btext.h>
49 #include <asm/sections.h>
50 #include <asm/machdep.h>
51 #include <asm/pSeries_reconfig.h>
52 #include <asm/pci-bridge.h>
53 #include <asm/kexec.h>
56 #define DBG(fmt...) printk(KERN_ERR fmt)
62 static int __initdata dt_root_addr_cells
;
63 static int __initdata dt_root_size_cells
;
66 int __initdata iommu_is_off
;
67 int __initdata iommu_force_on
;
68 unsigned long tce_alloc_start
, tce_alloc_end
;
74 static struct boot_param_header
*initial_boot_params __initdata
;
76 struct boot_param_header
*initial_boot_params
;
79 static struct device_node
*allnodes
= NULL
;
81 /* use when traversing tree through the allnext, child, sibling,
82 * or parent members of struct device_node.
84 static DEFINE_RWLOCK(devtree_lock
);
86 /* export that to outside world */
87 struct device_node
*of_chosen
;
89 struct device_node
*dflt_interrupt_controller
;
90 int num_interrupt_controllers
;
93 * Wrapper for allocating memory for various data that needs to be
94 * attached to device nodes as they are processed at boot or when
95 * added to the device tree later (e.g. DLPAR). At boot there is
96 * already a region reserved so we just increment *mem_start by size;
97 * otherwise we call kmalloc.
99 static void * prom_alloc(unsigned long size
, unsigned long *mem_start
)
104 return kmalloc(size
, GFP_KERNEL
);
112 * Find the device_node with a given phandle.
114 static struct device_node
* find_phandle(phandle ph
)
116 struct device_node
*np
;
118 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
119 if (np
->linux_phandle
== ph
)
125 * Find the interrupt parent of a node.
127 static struct device_node
* __devinit
intr_parent(struct device_node
*p
)
131 parp
= (phandle
*) get_property(p
, "interrupt-parent", NULL
);
134 p
= find_phandle(*parp
);
138 * On a powermac booted with BootX, we don't get to know the
139 * phandles for any nodes, so find_phandle will return NULL.
140 * Fortunately these machines only have one interrupt controller
141 * so there isn't in fact any ambiguity. -- paulus
143 if (num_interrupt_controllers
== 1)
144 p
= dflt_interrupt_controller
;
149 * Find out the size of each entry of the interrupts property
152 int __devinit
prom_n_intr_cells(struct device_node
*np
)
154 struct device_node
*p
;
157 for (p
= np
; (p
= intr_parent(p
)) != NULL
; ) {
158 icp
= (unsigned int *)
159 get_property(p
, "#interrupt-cells", NULL
);
162 if (get_property(p
, "interrupt-controller", NULL
) != NULL
163 || get_property(p
, "interrupt-map", NULL
) != NULL
) {
164 printk("oops, node %s doesn't have #interrupt-cells\n",
170 printk("prom_n_intr_cells failed for %s\n", np
->full_name
);
176 * Map an interrupt from a device up to the platform interrupt
179 static int __devinit
map_interrupt(unsigned int **irq
, struct device_node
**ictrler
,
180 struct device_node
*np
, unsigned int *ints
,
183 struct device_node
*p
, *ipar
;
184 unsigned int *imap
, *imask
, *ip
;
185 int i
, imaplen
, match
;
186 int newintrc
= 0, newaddrc
= 0;
190 reg
= (unsigned int *) get_property(np
, "reg", NULL
);
191 naddrc
= prom_n_addr_cells(np
);
194 if (get_property(p
, "interrupt-controller", NULL
) != NULL
)
195 /* this node is an interrupt controller, stop here */
197 imap
= (unsigned int *)
198 get_property(p
, "interrupt-map", &imaplen
);
203 imask
= (unsigned int *)
204 get_property(p
, "interrupt-map-mask", NULL
);
206 printk("oops, %s has interrupt-map but no mask\n",
210 imaplen
/= sizeof(unsigned int);
213 while (imaplen
> 0 && !match
) {
214 /* check the child-interrupt field */
216 for (i
= 0; i
< naddrc
&& match
; ++i
)
217 match
= ((reg
[i
] ^ imap
[i
]) & imask
[i
]) == 0;
218 for (; i
< naddrc
+ nintrc
&& match
; ++i
)
219 match
= ((ints
[i
-naddrc
] ^ imap
[i
]) & imask
[i
]) == 0;
220 imap
+= naddrc
+ nintrc
;
221 imaplen
-= naddrc
+ nintrc
;
222 /* grab the interrupt parent */
223 ipar
= find_phandle((phandle
) *imap
++);
225 if (ipar
== NULL
&& num_interrupt_controllers
== 1)
226 /* cope with BootX not giving us phandles */
227 ipar
= dflt_interrupt_controller
;
229 printk("oops, no int parent %x in map of %s\n",
230 imap
[-1], p
->full_name
);
233 /* find the parent's # addr and intr cells */
234 ip
= (unsigned int *)
235 get_property(ipar
, "#interrupt-cells", NULL
);
237 printk("oops, no #interrupt-cells on %s\n",
242 ip
= (unsigned int *)
243 get_property(ipar
, "#address-cells", NULL
);
244 newaddrc
= (ip
== NULL
)? 0: *ip
;
245 imap
+= newaddrc
+ newintrc
;
246 imaplen
-= newaddrc
+ newintrc
;
249 printk("oops, error decoding int-map on %s, len=%d\n",
250 p
->full_name
, imaplen
);
255 printk("oops, no match in %s int-map for %s\n",
256 p
->full_name
, np
->full_name
);
263 ints
= imap
- nintrc
;
268 printk("hmmm, int tree for %s doesn't have ctrler\n",
278 static unsigned char map_isa_senses
[4] = {
279 IRQ_SENSE_LEVEL
| IRQ_POLARITY_NEGATIVE
,
280 IRQ_SENSE_LEVEL
| IRQ_POLARITY_POSITIVE
,
281 IRQ_SENSE_EDGE
| IRQ_POLARITY_NEGATIVE
,
282 IRQ_SENSE_EDGE
| IRQ_POLARITY_POSITIVE
285 static unsigned char map_mpic_senses
[4] = {
286 IRQ_SENSE_EDGE
| IRQ_POLARITY_POSITIVE
,
287 IRQ_SENSE_LEVEL
| IRQ_POLARITY_NEGATIVE
,
288 /* 2 seems to be used for the 8259 cascade... */
289 IRQ_SENSE_LEVEL
| IRQ_POLARITY_POSITIVE
,
290 IRQ_SENSE_EDGE
| IRQ_POLARITY_NEGATIVE
,
293 static int __devinit
finish_node_interrupts(struct device_node
*np
,
294 unsigned long *mem_start
,
298 int intlen
, intrcells
, intrcount
;
300 unsigned int *irq
, virq
;
301 struct device_node
*ic
;
304 //#define TRACE(fmt...) do { if (trace) { printk(fmt); mdelay(1000); } } while(0)
305 #define TRACE(fmt...)
307 if (!strcmp(np
->name
, "smu-doorbell"))
310 TRACE("Finishing SMU doorbell ! num_interrupt_controllers = %d\n",
311 num_interrupt_controllers
);
313 if (num_interrupt_controllers
== 0) {
315 * Old machines just have a list of interrupt numbers
316 * and no interrupt-controller nodes.
318 ints
= (unsigned int *) get_property(np
, "AAPL,interrupts",
320 /* XXX old interpret_pci_props looked in parent too */
321 /* XXX old interpret_macio_props looked for interrupts
322 before AAPL,interrupts */
324 ints
= (unsigned int *) get_property(np
, "interrupts",
329 np
->n_intrs
= intlen
/ sizeof(unsigned int);
330 np
->intrs
= prom_alloc(np
->n_intrs
* sizeof(np
->intrs
[0]),
337 for (i
= 0; i
< np
->n_intrs
; ++i
) {
338 np
->intrs
[i
].line
= *ints
++;
339 np
->intrs
[i
].sense
= IRQ_SENSE_LEVEL
340 | IRQ_POLARITY_NEGATIVE
;
345 ints
= (unsigned int *) get_property(np
, "interrupts", &intlen
);
346 TRACE("ints=%p, intlen=%d\n", ints
, intlen
);
349 intrcells
= prom_n_intr_cells(np
);
350 intlen
/= intrcells
* sizeof(unsigned int);
351 TRACE("intrcells=%d, new intlen=%d\n", intrcells
, intlen
);
352 np
->intrs
= prom_alloc(intlen
* sizeof(*(np
->intrs
)), mem_start
);
360 for (i
= 0; i
< intlen
; ++i
, ints
+= intrcells
) {
361 n
= map_interrupt(&irq
, &ic
, np
, ints
, intrcells
);
362 TRACE("map, irq=%d, ic=%p, n=%d\n", irq
, ic
, n
);
366 /* don't map IRQ numbers under a cascaded 8259 controller */
367 if (ic
&& device_is_compatible(ic
, "chrp,iic")) {
368 np
->intrs
[intrcount
].line
= irq
[0];
369 sense
= (n
> 1)? (irq
[1] & 3): 3;
370 np
->intrs
[intrcount
].sense
= map_isa_senses
[sense
];
372 virq
= virt_irq_create_mapping(irq
[0]);
373 TRACE("virq=%d\n", virq
);
375 if (virq
== NO_IRQ
) {
376 printk(KERN_CRIT
"Could not allocate interrupt"
377 " number for %s\n", np
->full_name
);
381 np
->intrs
[intrcount
].line
= irq_offset_up(virq
);
382 sense
= (n
> 1)? (irq
[1] & 3): 1;
384 /* Apple uses bits in there in a different way, let's
385 * only keep the real sense bit on macs
387 if (machine_is(powermac
))
389 np
->intrs
[intrcount
].sense
= map_mpic_senses
[sense
];
393 /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */
394 if (machine_is(powermac
) && ic
&& ic
->parent
) {
395 char *name
= get_property(ic
->parent
, "name", NULL
);
396 if (name
&& !strcmp(name
, "u3"))
397 np
->intrs
[intrcount
].line
+= 128;
398 else if (!(name
&& (!strcmp(name
, "mac-io") ||
399 !strcmp(name
, "u4"))))
400 /* ignore other cascaded controllers, such as
404 #endif /* CONFIG_PPC64 */
406 printk("hmmm, got %d intr cells for %s:", n
,
408 for (j
= 0; j
< n
; ++j
)
409 printk(" %d", irq
[j
]);
414 np
->n_intrs
= intrcount
;
419 static int __devinit
finish_node(struct device_node
*np
,
420 unsigned long *mem_start
,
423 struct device_node
*child
;
426 rc
= finish_node_interrupts(np
, mem_start
, measure_only
);
430 for (child
= np
->child
; child
!= NULL
; child
= child
->sibling
) {
431 rc
= finish_node(child
, mem_start
, measure_only
);
439 static void __init
scan_interrupt_controllers(void)
441 struct device_node
*np
;
446 for (np
= allnodes
; np
!= NULL
; np
= np
->allnext
) {
447 ic
= get_property(np
, "interrupt-controller", &iclen
);
448 name
= get_property(np
, "name", NULL
);
449 /* checking iclen makes sure we don't get a false
450 match on /chosen.interrupt_controller */
452 && strcmp(name
, "interrupt-controller") == 0)
453 || (ic
!= NULL
&& iclen
== 0
454 && strcmp(name
, "AppleKiwi"))) {
456 dflt_interrupt_controller
= np
;
460 num_interrupt_controllers
= n
;
464 * finish_device_tree is called once things are running normally
465 * (i.e. with text and data mapped to the address they were linked at).
466 * It traverses the device tree and fills in some of the additional,
467 * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt
468 * mapping is also initialized at this point.
470 void __init
finish_device_tree(void)
472 unsigned long start
, end
, size
= 0;
474 DBG(" -> finish_device_tree\n");
477 /* Initialize virtual IRQ map */
480 scan_interrupt_controllers();
483 * Finish device-tree (pre-parsing some properties etc...)
484 * We do this in 2 passes. One with "measure_only" set, which
485 * will only measure the amount of memory needed, then we can
486 * allocate that memory, and call finish_node again. However,
487 * we must be careful as most routines will fail nowadays when
488 * prom_alloc() returns 0, so we must make sure our first pass
489 * doesn't start at 0. We pre-initialize size to 16 for that
490 * reason and then remove those additional 16 bytes
493 finish_node(allnodes
, &size
, 1);
499 end
= start
= (unsigned long)__va(lmb_alloc(size
, 128));
501 finish_node(allnodes
, &end
, 0);
502 BUG_ON(end
!= start
+ size
);
504 DBG(" <- finish_device_tree\n");
507 static inline char *find_flat_dt_string(u32 offset
)
509 return ((char *)initial_boot_params
) +
510 initial_boot_params
->off_dt_strings
+ offset
;
514 * This function is used to scan the flattened device-tree, it is
515 * used to extract the memory informations at boot before we can
518 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
519 const char *uname
, int depth
,
523 unsigned long p
= ((unsigned long)initial_boot_params
) +
524 initial_boot_params
->off_dt_struct
;
529 u32 tag
= *((u32
*)p
);
533 if (tag
== OF_DT_END_NODE
) {
537 if (tag
== OF_DT_NOP
)
539 if (tag
== OF_DT_END
)
541 if (tag
== OF_DT_PROP
) {
542 u32 sz
= *((u32
*)p
);
544 if (initial_boot_params
->version
< 0x10)
545 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
550 if (tag
!= OF_DT_BEGIN_NODE
) {
551 printk(KERN_WARNING
"Invalid tag %x scanning flattened"
552 " device tree !\n", tag
);
557 p
= _ALIGN(p
+ strlen(pathp
) + 1, 4);
558 if ((*pathp
) == '/') {
560 for (lp
= NULL
, np
= pathp
; *np
; np
++)
566 rc
= it(p
, pathp
, depth
, data
);
574 unsigned long __init
of_get_flat_dt_root(void)
576 unsigned long p
= ((unsigned long)initial_boot_params
) +
577 initial_boot_params
->off_dt_struct
;
579 while(*((u32
*)p
) == OF_DT_NOP
)
581 BUG_ON (*((u32
*)p
) != OF_DT_BEGIN_NODE
);
583 return _ALIGN(p
+ strlen((char *)p
) + 1, 4);
587 * This function can be used within scan_flattened_dt callback to get
588 * access to properties
590 void* __init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
593 unsigned long p
= node
;
596 u32 tag
= *((u32
*)p
);
601 if (tag
== OF_DT_NOP
)
603 if (tag
!= OF_DT_PROP
)
607 noff
= *((u32
*)(p
+ 4));
609 if (initial_boot_params
->version
< 0x10)
610 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
612 nstr
= find_flat_dt_string(noff
);
614 printk(KERN_WARNING
"Can't find property index"
618 if (strcmp(name
, nstr
) == 0) {
628 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
631 unsigned long cplen
, l
;
633 cp
= of_get_flat_dt_prop(node
, "compatible", &cplen
);
637 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
647 static void *__init
unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
652 *mem
= _ALIGN(*mem
, align
);
659 static unsigned long __init
unflatten_dt_node(unsigned long mem
,
661 struct device_node
*dad
,
662 struct device_node
***allnextpp
,
663 unsigned long fpsize
)
665 struct device_node
*np
;
666 struct property
*pp
, **prev_pp
= NULL
;
669 unsigned int l
, allocl
;
673 tag
= *((u32
*)(*p
));
674 if (tag
!= OF_DT_BEGIN_NODE
) {
675 printk("Weird tag at start of node: %x\n", tag
);
680 l
= allocl
= strlen(pathp
) + 1;
681 *p
= _ALIGN(*p
+ l
, 4);
683 /* version 0x10 has a more compact unit name here instead of the full
684 * path. we accumulate the full path size using "fpsize", we'll rebuild
685 * it later. We detect this because the first character of the name is
688 if ((*pathp
) != '/') {
691 /* root node: special case. fpsize accounts for path
692 * plus terminating zero. root node only has '/', so
693 * fpsize should be 2, but we want to avoid the first
694 * level nodes to have two '/' so we use fpsize 1 here
699 /* account for '/' and path size minus terminal 0
708 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
709 __alignof__(struct device_node
));
711 memset(np
, 0, sizeof(*np
));
712 np
->full_name
= ((char*)np
) + sizeof(struct device_node
);
714 char *p
= np
->full_name
;
715 /* rebuild full path for new format */
716 if (dad
&& dad
->parent
) {
717 strcpy(p
, dad
->full_name
);
719 if ((strlen(p
) + l
+ 1) != allocl
) {
720 DBG("%s: p: %d, l: %d, a: %d\n",
721 pathp
, (int)strlen(p
), l
, allocl
);
729 memcpy(np
->full_name
, pathp
, l
);
730 prev_pp
= &np
->properties
;
732 *allnextpp
= &np
->allnext
;
735 /* we temporarily use the next field as `last_child'*/
739 dad
->next
->sibling
= np
;
742 kref_init(&np
->kref
);
748 tag
= *((u32
*)(*p
));
749 if (tag
== OF_DT_NOP
) {
753 if (tag
!= OF_DT_PROP
)
757 noff
= *((u32
*)((*p
) + 4));
759 if (initial_boot_params
->version
< 0x10)
760 *p
= _ALIGN(*p
, sz
>= 8 ? 8 : 4);
762 pname
= find_flat_dt_string(noff
);
764 printk("Can't find property name in list !\n");
767 if (strcmp(pname
, "name") == 0)
769 l
= strlen(pname
) + 1;
770 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
771 __alignof__(struct property
));
773 if (strcmp(pname
, "linux,phandle") == 0) {
774 np
->node
= *((u32
*)*p
);
775 if (np
->linux_phandle
== 0)
776 np
->linux_phandle
= np
->node
;
778 if (strcmp(pname
, "ibm,phandle") == 0)
779 np
->linux_phandle
= *((u32
*)*p
);
782 pp
->value
= (void *)*p
;
786 *p
= _ALIGN((*p
) + sz
, 4);
788 /* with version 0x10 we may not have the name property, recreate
789 * it here from the unit name if absent
792 char *p
= pathp
, *ps
= pathp
, *pa
= NULL
;
805 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
806 __alignof__(struct property
));
810 pp
->value
= (unsigned char *)(pp
+ 1);
813 memcpy(pp
->value
, ps
, sz
- 1);
814 ((char *)pp
->value
)[sz
- 1] = 0;
815 DBG("fixed up name for %s -> %s\n", pathp
, pp
->value
);
820 np
->name
= get_property(np
, "name", NULL
);
821 np
->type
= get_property(np
, "device_type", NULL
);
828 while (tag
== OF_DT_BEGIN_NODE
) {
829 mem
= unflatten_dt_node(mem
, p
, np
, allnextpp
, fpsize
);
830 tag
= *((u32
*)(*p
));
832 if (tag
!= OF_DT_END_NODE
) {
833 printk("Weird tag at end of node: %x\n", tag
);
840 static int __init
early_parse_mem(char *p
)
845 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
846 DBG("memory limit = 0x%lx\n", memory_limit
);
850 early_param("mem", early_parse_mem
);
853 * The device tree may be allocated below our memory limit, or inside the
854 * crash kernel region for kdump. If so, move it out now.
856 static void move_device_tree(void)
858 unsigned long start
, size
;
861 DBG("-> move_device_tree\n");
863 start
= __pa(initial_boot_params
);
864 size
= initial_boot_params
->totalsize
;
866 if ((memory_limit
&& (start
+ size
) > memory_limit
) ||
867 overlaps_crashkernel(start
, size
)) {
868 p
= __va(lmb_alloc_base(size
, PAGE_SIZE
, lmb
.rmo_size
));
869 memcpy(p
, initial_boot_params
, size
);
870 initial_boot_params
= (struct boot_param_header
*)p
;
871 DBG("Moved device tree to 0x%p\n", p
);
874 DBG("<- move_device_tree\n");
878 * unflattens the device-tree passed by the firmware, creating the
879 * tree of struct device_node. It also fills the "name" and "type"
880 * pointers of the nodes so the normal device-tree walking functions
881 * can be used (this used to be done by finish_device_tree)
883 void __init
unflatten_device_tree(void)
885 unsigned long start
, mem
, size
;
886 struct device_node
**allnextp
= &allnodes
;
888 DBG(" -> unflatten_device_tree()\n");
890 /* First pass, scan for size */
891 start
= ((unsigned long)initial_boot_params
) +
892 initial_boot_params
->off_dt_struct
;
893 size
= unflatten_dt_node(0, &start
, NULL
, NULL
, 0);
894 size
= (size
| 3) + 1;
896 DBG(" size is %lx, allocating...\n", size
);
898 /* Allocate memory for the expanded device tree */
899 mem
= lmb_alloc(size
+ 4, __alignof__(struct device_node
));
900 mem
= (unsigned long) __va(mem
);
902 ((u32
*)mem
)[size
/ 4] = 0xdeadbeef;
904 DBG(" unflattening %lx...\n", mem
);
906 /* Second pass, do actual unflattening */
907 start
= ((unsigned long)initial_boot_params
) +
908 initial_boot_params
->off_dt_struct
;
909 unflatten_dt_node(mem
, &start
, NULL
, &allnextp
, 0);
910 if (*((u32
*)start
) != OF_DT_END
)
911 printk(KERN_WARNING
"Weird tag at end of tree: %08x\n", *((u32
*)start
));
912 if (((u32
*)mem
)[size
/ 4] != 0xdeadbeef)
913 printk(KERN_WARNING
"End of tree marker overwritten: %08x\n",
914 ((u32
*)mem
)[size
/ 4] );
917 /* Get pointer to OF "/chosen" node for use everywhere */
918 of_chosen
= of_find_node_by_path("/chosen");
919 if (of_chosen
== NULL
)
920 of_chosen
= of_find_node_by_path("/chosen@0");
922 DBG(" <- unflatten_device_tree()\n");
926 * ibm,pa-features is a per-cpu property that contains a string of
927 * attribute descriptors, each of which has a 2 byte header plus up
928 * to 254 bytes worth of processor attribute bits. First header
929 * byte specifies the number of bytes following the header.
930 * Second header byte is an "attribute-specifier" type, of which
931 * zero is the only currently-defined value.
932 * Implementation: Pass in the byte and bit offset for the feature
933 * that we are interested in. The function will return -1 if the
934 * pa-features property is missing, or a 1/0 to indicate if the feature
935 * is supported/not supported. Note that the bit numbers are
936 * big-endian to match the definition in PAPR.
938 static struct ibm_pa_feature
{
939 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
940 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
941 unsigned char pabyte
; /* byte number in ibm,pa-features */
942 unsigned char pabit
; /* bit number (big-endian) */
943 unsigned char invert
; /* if 1, pa bit set => clear feature */
944 } ibm_pa_features
[] __initdata
= {
945 {0, PPC_FEATURE_HAS_MMU
, 0, 0, 0},
946 {0, PPC_FEATURE_HAS_FPU
, 0, 1, 0},
947 {CPU_FTR_SLB
, 0, 0, 2, 0},
948 {CPU_FTR_CTRL
, 0, 0, 3, 0},
949 {CPU_FTR_NOEXECUTE
, 0, 0, 6, 0},
950 {CPU_FTR_NODSISRALIGN
, 0, 1, 1, 1},
952 /* put this back once we know how to test if firmware does 64k IO */
953 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
955 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
958 static void __init
check_cpu_pa_features(unsigned long node
)
960 unsigned char *pa_ftrs
;
961 unsigned long len
, tablelen
, i
, bit
;
963 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
967 /* find descriptor with type == 0 */
971 len
= 2 + pa_ftrs
[0];
973 return; /* descriptor 0 not found */
980 /* loop over bits we know about */
981 for (i
= 0; i
< ARRAY_SIZE(ibm_pa_features
); ++i
) {
982 struct ibm_pa_feature
*fp
= &ibm_pa_features
[i
];
984 if (fp
->pabyte
>= pa_ftrs
[0])
986 bit
= (pa_ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
987 if (bit
^ fp
->invert
) {
988 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
989 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
991 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
992 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
997 static int __init
early_init_dt_scan_cpus(unsigned long node
,
998 const char *uname
, int depth
,
1001 static int logical_cpuid
= 0;
1002 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
1003 #ifdef CONFIG_ALTIVEC
1011 /* We are scanning "cpu" nodes only */
1012 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
1015 /* Get physical cpuid */
1016 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
1018 nthreads
= len
/ sizeof(int);
1020 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
1025 * Now see if any of these threads match our boot cpu.
1026 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
1028 for (i
= 0; i
< nthreads
; i
++) {
1030 * version 2 of the kexec param format adds the phys cpuid of
1033 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
1035 initial_boot_params
->boot_cpuid_phys
) {
1041 * Check if it's the boot-cpu, set it's hw index now,
1042 * unfortunately this format did not support booting
1043 * off secondary threads.
1045 if (of_get_flat_dt_prop(node
,
1046 "linux,boot-cpu", NULL
) != NULL
) {
1053 /* logical cpu id is always 0 on UP kernels */
1059 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
1061 boot_cpuid
= logical_cpuid
;
1062 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
1065 #ifdef CONFIG_ALTIVEC
1066 /* Check if we have a VMX and eventually update CPU features */
1067 prop
= (u32
*)of_get_flat_dt_prop(node
, "ibm,vmx", NULL
);
1068 if (prop
&& (*prop
) > 0) {
1069 cur_cpu_spec
->cpu_features
|= CPU_FTR_ALTIVEC
;
1070 cur_cpu_spec
->cpu_user_features
|= PPC_FEATURE_HAS_ALTIVEC
;
1073 /* Same goes for Apple's "altivec" property */
1074 prop
= (u32
*)of_get_flat_dt_prop(node
, "altivec", NULL
);
1076 cur_cpu_spec
->cpu_features
|= CPU_FTR_ALTIVEC
;
1077 cur_cpu_spec
->cpu_user_features
|= PPC_FEATURE_HAS_ALTIVEC
;
1079 #endif /* CONFIG_ALTIVEC */
1081 check_cpu_pa_features(node
);
1083 #ifdef CONFIG_PPC_PSERIES
1085 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
1087 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
1093 static int __init
early_init_dt_scan_chosen(unsigned long node
,
1094 const char *uname
, int depth
, void *data
)
1096 unsigned long *lprop
;
1100 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
1103 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
1107 /* check if iommu is forced on or off */
1108 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
1110 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
1114 /* mem=x on the command line is the preferred mechanism */
1115 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
1117 memory_limit
= *lprop
;
1120 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
1122 tce_alloc_start
= *lprop
;
1123 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
1125 tce_alloc_end
= *lprop
;
1129 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
1131 crashk_res
.start
= *lprop
;
1133 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
1135 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
1138 /* Retreive command line */
1139 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
1140 if (p
!= NULL
&& l
> 0)
1141 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
1143 #ifdef CONFIG_CMDLINE
1144 if (l
== 0 || (l
== 1 && (*p
) == 0))
1145 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
1146 #endif /* CONFIG_CMDLINE */
1148 DBG("Command line is: %s\n", cmd_line
);
1154 static int __init
early_init_dt_scan_root(unsigned long node
,
1155 const char *uname
, int depth
, void *data
)
1162 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
1163 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
1164 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
1166 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
1167 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
1168 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
1174 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
1179 /* Ignore more than 2 cells */
1180 while (s
> sizeof(unsigned long) / 4) {
1198 static int __init
early_init_dt_scan_memory(unsigned long node
,
1199 const char *uname
, int depth
, void *data
)
1201 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
1205 /* We are scanning "memory" nodes only */
1208 * The longtrail doesn't have a device_type on the
1209 * /memory node, so look for the node called /memory@0.
1211 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
1213 } else if (strcmp(type
, "memory") != 0)
1216 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
1218 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
1222 endp
= reg
+ (l
/ sizeof(cell_t
));
1224 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
1225 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
1227 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
1228 unsigned long base
, size
;
1230 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
1231 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
1235 DBG(" - %lx , %lx\n", base
, size
);
1238 if (base
>= 0x80000000ul
)
1240 if ((base
+ size
) > 0x80000000ul
)
1241 size
= 0x80000000ul
- base
;
1244 lmb_add(base
, size
);
1249 static void __init
early_reserve_mem(void)
1253 unsigned long self_base
;
1254 unsigned long self_size
;
1256 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
1257 initial_boot_params
->off_mem_rsvmap
);
1259 /* before we do anything, lets reserve the dt blob */
1260 self_base
= __pa((unsigned long)initial_boot_params
);
1261 self_size
= initial_boot_params
->totalsize
;
1262 lmb_reserve(self_base
, self_size
);
1266 * Handle the case where we might be booting from an old kexec
1267 * image that setup the mem_rsvmap as pairs of 32-bit values
1269 if (*reserve_map
> 0xffffffffull
) {
1270 u32 base_32
, size_32
;
1271 u32
*reserve_map_32
= (u32
*)reserve_map
;
1274 base_32
= *(reserve_map_32
++);
1275 size_32
= *(reserve_map_32
++);
1278 /* skip if the reservation is for the blob */
1279 if (base_32
== self_base
&& size_32
== self_size
)
1281 DBG("reserving: %x -> %x\n", base_32
, size_32
);
1282 lmb_reserve(base_32
, size_32
);
1288 base
= *(reserve_map
++);
1289 size
= *(reserve_map
++);
1292 /* skip if the reservation is for the blob */
1293 if (base
== self_base
&& size
== self_size
)
1295 DBG("reserving: %llx -> %llx\n", base
, size
);
1296 lmb_reserve(base
, size
);
1300 DBG("memory reserved, lmbs :\n");
1305 void __init
early_init_devtree(void *params
)
1307 DBG(" -> early_init_devtree()\n");
1309 /* Setup flat device-tree pointer */
1310 initial_boot_params
= params
;
1312 #ifdef CONFIG_PPC_RTAS
1313 /* Some machines might need RTAS info for debugging, grab it now. */
1314 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
1317 /* Retrieve various informations from the /chosen node of the
1318 * device-tree, including the platform type, initrd location and
1319 * size, TCE reserve, and more ...
1321 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
1323 /* Scan memory nodes and rebuild LMBs */
1325 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
1326 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
1328 /* Save command line for /proc/cmdline and then parse parameters */
1329 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
1330 parse_early_param();
1332 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1333 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
1334 reserve_kdump_trampoline();
1335 reserve_crashkernel();
1336 early_reserve_mem();
1338 lmb_enforce_memory_limit(memory_limit
);
1341 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1343 /* We may need to relocate the flat tree, do it now.
1344 * FIXME .. and the initrd too? */
1347 DBG("Scanning CPUs ...\n");
1349 /* Retreive CPU related informations from the flat tree
1350 * (altivec support, boot CPU ID, ...)
1352 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1354 DBG(" <- early_init_devtree()\n");
1360 prom_n_addr_cells(struct device_node
* np
)
1366 ip
= (int *) get_property(np
, "#address-cells", NULL
);
1369 } while (np
->parent
);
1370 /* No #address-cells property for the root node, default to 1 */
1373 EXPORT_SYMBOL(prom_n_addr_cells
);
1376 prom_n_size_cells(struct device_node
* np
)
1382 ip
= (int *) get_property(np
, "#size-cells", NULL
);
1385 } while (np
->parent
);
1386 /* No #size-cells property for the root node, default to 1 */
1389 EXPORT_SYMBOL(prom_n_size_cells
);
1392 * Work out the sense (active-low level / active-high edge)
1393 * of each interrupt from the device tree.
1395 void __init
prom_get_irq_senses(unsigned char *senses
, int off
, int max
)
1397 struct device_node
*np
;
1400 /* default to level-triggered */
1401 memset(senses
, IRQ_SENSE_LEVEL
| IRQ_POLARITY_NEGATIVE
, max
- off
);
1403 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1404 for (j
= 0; j
< np
->n_intrs
; j
++) {
1405 i
= np
->intrs
[j
].line
;
1406 if (i
>= off
&& i
< max
)
1407 senses
[i
-off
] = np
->intrs
[j
].sense
;
1413 * Construct and return a list of the device_nodes with a given name.
1415 struct device_node
*find_devices(const char *name
)
1417 struct device_node
*head
, **prevp
, *np
;
1420 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1421 if (np
->name
!= 0 && strcasecmp(np
->name
, name
) == 0) {
1429 EXPORT_SYMBOL(find_devices
);
1432 * Construct and return a list of the device_nodes with a given type.
1434 struct device_node
*find_type_devices(const char *type
)
1436 struct device_node
*head
, **prevp
, *np
;
1439 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1440 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0) {
1448 EXPORT_SYMBOL(find_type_devices
);
1451 * Returns all nodes linked together
1453 struct device_node
*find_all_nodes(void)
1455 struct device_node
*head
, **prevp
, *np
;
1458 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1465 EXPORT_SYMBOL(find_all_nodes
);
1467 /** Checks if the given "compat" string matches one of the strings in
1468 * the device's "compatible" property
1470 int device_is_compatible(struct device_node
*device
, const char *compat
)
1475 cp
= (char *) get_property(device
, "compatible", &cplen
);
1479 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1488 EXPORT_SYMBOL(device_is_compatible
);
1492 * Indicates whether the root node has a given value in its
1493 * compatible property.
1495 int machine_is_compatible(const char *compat
)
1497 struct device_node
*root
;
1500 root
= of_find_node_by_path("/");
1502 rc
= device_is_compatible(root
, compat
);
1507 EXPORT_SYMBOL(machine_is_compatible
);
1510 * Construct and return a list of the device_nodes with a given type
1511 * and compatible property.
1513 struct device_node
*find_compatible_devices(const char *type
,
1516 struct device_node
*head
, **prevp
, *np
;
1519 for (np
= allnodes
; np
!= 0; np
= np
->allnext
) {
1521 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1523 if (device_is_compatible(np
, compat
)) {
1531 EXPORT_SYMBOL(find_compatible_devices
);
1534 * Find the device_node with a given full_name.
1536 struct device_node
*find_path_device(const char *path
)
1538 struct device_node
*np
;
1540 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1541 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0)
1545 EXPORT_SYMBOL(find_path_device
);
1549 * New implementation of the OF "find" APIs, return a refcounted
1550 * object, call of_node_put() when done. The device tree and list
1551 * are protected by a rw_lock.
1553 * Note that property management will need some locking as well,
1554 * this isn't dealt with yet.
1559 * of_find_node_by_name - Find a node by its "name" property
1560 * @from: The node to start searching from or NULL, the node
1561 * you pass will not be searched, only the next one
1562 * will; typically, you pass what the previous call
1563 * returned. of_node_put() will be called on it
1564 * @name: The name string to match against
1566 * Returns a node pointer with refcount incremented, use
1567 * of_node_put() on it when done.
1569 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1572 struct device_node
*np
;
1574 read_lock(&devtree_lock
);
1575 np
= from
? from
->allnext
: allnodes
;
1576 for (; np
!= NULL
; np
= np
->allnext
)
1577 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1582 read_unlock(&devtree_lock
);
1585 EXPORT_SYMBOL(of_find_node_by_name
);
1588 * of_find_node_by_type - Find a node by its "device_type" property
1589 * @from: The node to start searching from or NULL, the node
1590 * you pass will not be searched, only the next one
1591 * will; typically, you pass what the previous call
1592 * returned. of_node_put() will be called on it
1593 * @name: The type string to match against
1595 * Returns a node pointer with refcount incremented, use
1596 * of_node_put() on it when done.
1598 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1601 struct device_node
*np
;
1603 read_lock(&devtree_lock
);
1604 np
= from
? from
->allnext
: allnodes
;
1605 for (; np
!= 0; np
= np
->allnext
)
1606 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1611 read_unlock(&devtree_lock
);
1614 EXPORT_SYMBOL(of_find_node_by_type
);
1617 * of_find_compatible_node - Find a node based on type and one of the
1618 * tokens in its "compatible" property
1619 * @from: The node to start searching from or NULL, the node
1620 * you pass will not be searched, only the next one
1621 * will; typically, you pass what the previous call
1622 * returned. of_node_put() will be called on it
1623 * @type: The type string to match "device_type" or NULL to ignore
1624 * @compatible: The string to match to one of the tokens in the device
1625 * "compatible" list.
1627 * Returns a node pointer with refcount incremented, use
1628 * of_node_put() on it when done.
1630 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1631 const char *type
, const char *compatible
)
1633 struct device_node
*np
;
1635 read_lock(&devtree_lock
);
1636 np
= from
? from
->allnext
: allnodes
;
1637 for (; np
!= 0; np
= np
->allnext
) {
1639 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1641 if (device_is_compatible(np
, compatible
) && of_node_get(np
))
1646 read_unlock(&devtree_lock
);
1649 EXPORT_SYMBOL(of_find_compatible_node
);
1652 * of_find_node_by_path - Find a node matching a full OF path
1653 * @path: The full path to match
1655 * Returns a node pointer with refcount incremented, use
1656 * of_node_put() on it when done.
1658 struct device_node
*of_find_node_by_path(const char *path
)
1660 struct device_node
*np
= allnodes
;
1662 read_lock(&devtree_lock
);
1663 for (; np
!= 0; np
= np
->allnext
) {
1664 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1668 read_unlock(&devtree_lock
);
1671 EXPORT_SYMBOL(of_find_node_by_path
);
1674 * of_find_node_by_phandle - Find a node given a phandle
1675 * @handle: phandle of the node to find
1677 * Returns a node pointer with refcount incremented, use
1678 * of_node_put() on it when done.
1680 struct device_node
*of_find_node_by_phandle(phandle handle
)
1682 struct device_node
*np
;
1684 read_lock(&devtree_lock
);
1685 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1686 if (np
->linux_phandle
== handle
)
1690 read_unlock(&devtree_lock
);
1693 EXPORT_SYMBOL(of_find_node_by_phandle
);
1696 * of_find_all_nodes - Get next node in global list
1697 * @prev: Previous node or NULL to start iteration
1698 * of_node_put() will be called on it
1700 * Returns a node pointer with refcount incremented, use
1701 * of_node_put() on it when done.
1703 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1705 struct device_node
*np
;
1707 read_lock(&devtree_lock
);
1708 np
= prev
? prev
->allnext
: allnodes
;
1709 for (; np
!= 0; np
= np
->allnext
)
1710 if (of_node_get(np
))
1714 read_unlock(&devtree_lock
);
1717 EXPORT_SYMBOL(of_find_all_nodes
);
1720 * of_get_parent - Get a node's parent if any
1721 * @node: Node to get parent
1723 * Returns a node pointer with refcount incremented, use
1724 * of_node_put() on it when done.
1726 struct device_node
*of_get_parent(const struct device_node
*node
)
1728 struct device_node
*np
;
1733 read_lock(&devtree_lock
);
1734 np
= of_node_get(node
->parent
);
1735 read_unlock(&devtree_lock
);
1738 EXPORT_SYMBOL(of_get_parent
);
1741 * of_get_next_child - Iterate a node childs
1742 * @node: parent node
1743 * @prev: previous child of the parent node, or NULL to get first
1745 * Returns a node pointer with refcount incremented, use
1746 * of_node_put() on it when done.
1748 struct device_node
*of_get_next_child(const struct device_node
*node
,
1749 struct device_node
*prev
)
1751 struct device_node
*next
;
1753 read_lock(&devtree_lock
);
1754 next
= prev
? prev
->sibling
: node
->child
;
1755 for (; next
!= 0; next
= next
->sibling
)
1756 if (of_node_get(next
))
1760 read_unlock(&devtree_lock
);
1763 EXPORT_SYMBOL(of_get_next_child
);
1766 * of_node_get - Increment refcount of a node
1767 * @node: Node to inc refcount, NULL is supported to
1768 * simplify writing of callers
1772 struct device_node
*of_node_get(struct device_node
*node
)
1775 kref_get(&node
->kref
);
1778 EXPORT_SYMBOL(of_node_get
);
1780 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1782 return container_of(kref
, struct device_node
, kref
);
1786 * of_node_release - release a dynamically allocated node
1787 * @kref: kref element of the node to be released
1789 * In of_node_put() this function is passed to kref_put()
1790 * as the destructor.
1792 static void of_node_release(struct kref
*kref
)
1794 struct device_node
*node
= kref_to_device_node(kref
);
1795 struct property
*prop
= node
->properties
;
1797 if (!OF_IS_DYNAMIC(node
))
1800 struct property
*next
= prop
->next
;
1807 prop
= node
->deadprops
;
1808 node
->deadprops
= NULL
;
1812 kfree(node
->full_name
);
1818 * of_node_put - Decrement refcount of a node
1819 * @node: Node to dec refcount, NULL is supported to
1820 * simplify writing of callers
1823 void of_node_put(struct device_node
*node
)
1826 kref_put(&node
->kref
, of_node_release
);
1828 EXPORT_SYMBOL(of_node_put
);
1831 * Plug a device node into the tree and global list.
1833 void of_attach_node(struct device_node
*np
)
1835 write_lock(&devtree_lock
);
1836 np
->sibling
= np
->parent
->child
;
1837 np
->allnext
= allnodes
;
1838 np
->parent
->child
= np
;
1840 write_unlock(&devtree_lock
);
1844 * "Unplug" a node from the device tree. The caller must hold
1845 * a reference to the node. The memory associated with the node
1846 * is not freed until its refcount goes to zero.
1848 void of_detach_node(const struct device_node
*np
)
1850 struct device_node
*parent
;
1852 write_lock(&devtree_lock
);
1854 parent
= np
->parent
;
1857 allnodes
= np
->allnext
;
1859 struct device_node
*prev
;
1860 for (prev
= allnodes
;
1861 prev
->allnext
!= np
;
1862 prev
= prev
->allnext
)
1864 prev
->allnext
= np
->allnext
;
1867 if (parent
->child
== np
)
1868 parent
->child
= np
->sibling
;
1870 struct device_node
*prevsib
;
1871 for (prevsib
= np
->parent
->child
;
1872 prevsib
->sibling
!= np
;
1873 prevsib
= prevsib
->sibling
)
1875 prevsib
->sibling
= np
->sibling
;
1878 write_unlock(&devtree_lock
);
1881 #ifdef CONFIG_PPC_PSERIES
1883 * Fix up the uninitialized fields in a new device node:
1884 * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields
1886 * A lot of boot-time code is duplicated here, because functions such
1887 * as finish_node_interrupts, interpret_pci_props, etc. cannot use the
1890 * This should probably be split up into smaller chunks.
1893 static int of_finish_dynamic_node(struct device_node
*node
)
1895 struct device_node
*parent
= of_get_parent(node
);
1897 phandle
*ibm_phandle
;
1899 node
->name
= get_property(node
, "name", NULL
);
1900 node
->type
= get_property(node
, "device_type", NULL
);
1907 /* We don't support that function on PowerMac, at least
1910 if (machine_is(powermac
))
1913 /* fix up new node's linux_phandle field */
1914 if ((ibm_phandle
= (unsigned int *)get_property(node
,
1915 "ibm,phandle", NULL
)))
1916 node
->linux_phandle
= *ibm_phandle
;
1919 of_node_put(parent
);
1923 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1924 unsigned long action
, void *node
)
1929 case PSERIES_RECONFIG_ADD
:
1930 err
= of_finish_dynamic_node(node
);
1932 finish_node(node
, NULL
, 0);
1934 printk(KERN_ERR
"finish_node returned %d\n", err
);
1945 static struct notifier_block prom_reconfig_nb
= {
1946 .notifier_call
= prom_reconfig_notifier
,
1947 .priority
= 10, /* This one needs to run first */
1950 static int __init
prom_reconfig_setup(void)
1952 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1954 __initcall(prom_reconfig_setup
);
1957 struct property
*of_find_property(struct device_node
*np
, const char *name
,
1960 struct property
*pp
;
1962 read_lock(&devtree_lock
);
1963 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1964 if (strcmp(pp
->name
, name
) == 0) {
1969 read_unlock(&devtree_lock
);
1975 * Find a property with a given name for a given node
1976 * and return the value.
1978 void *get_property(struct device_node
*np
, const char *name
, int *lenp
)
1980 struct property
*pp
= of_find_property(np
,name
,lenp
);
1981 return pp
? pp
->value
: NULL
;
1983 EXPORT_SYMBOL(get_property
);
1986 * Add a property to a node
1988 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1990 struct property
**next
;
1993 write_lock(&devtree_lock
);
1994 next
= &np
->properties
;
1996 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1997 /* duplicate ! don't insert it */
1998 write_unlock(&devtree_lock
);
2001 next
= &(*next
)->next
;
2004 write_unlock(&devtree_lock
);
2006 #ifdef CONFIG_PROC_DEVICETREE
2007 /* try to add to proc as well if it was initialized */
2009 proc_device_tree_add_prop(np
->pde
, prop
);
2010 #endif /* CONFIG_PROC_DEVICETREE */
2016 * Remove a property from a node. Note that we don't actually
2017 * remove it, since we have given out who-knows-how-many pointers
2018 * to the data using get-property. Instead we just move the property
2019 * to the "dead properties" list, so it won't be found any more.
2021 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
2023 struct property
**next
;
2026 write_lock(&devtree_lock
);
2027 next
= &np
->properties
;
2029 if (*next
== prop
) {
2030 /* found the node */
2032 prop
->next
= np
->deadprops
;
2033 np
->deadprops
= prop
;
2037 next
= &(*next
)->next
;
2039 write_unlock(&devtree_lock
);
2044 #ifdef CONFIG_PROC_DEVICETREE
2045 /* try to remove the proc node as well */
2047 proc_device_tree_remove_prop(np
->pde
, prop
);
2048 #endif /* CONFIG_PROC_DEVICETREE */
2054 * Update a property in a node. Note that we don't actually
2055 * remove it, since we have given out who-knows-how-many pointers
2056 * to the data using get-property. Instead we just move the property
2057 * to the "dead properties" list, and add the new property to the
2060 int prom_update_property(struct device_node
*np
,
2061 struct property
*newprop
,
2062 struct property
*oldprop
)
2064 struct property
**next
;
2067 write_lock(&devtree_lock
);
2068 next
= &np
->properties
;
2070 if (*next
== oldprop
) {
2071 /* found the node */
2072 newprop
->next
= oldprop
->next
;
2074 oldprop
->next
= np
->deadprops
;
2075 np
->deadprops
= oldprop
;
2079 next
= &(*next
)->next
;
2081 write_unlock(&devtree_lock
);
2086 #ifdef CONFIG_PROC_DEVICETREE
2087 /* try to add to proc as well if it was initialized */
2089 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
2090 #endif /* CONFIG_PROC_DEVICETREE */
2096 /* Find the device node for a given logical cpu number, also returns the cpu
2097 * local thread number (index in ibm,interrupt-server#s) if relevant and
2098 * asked for (non NULL)
2100 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
2103 struct device_node
*np
;
2105 hardid
= get_hard_smp_processor_id(cpu
);
2107 for_each_node_by_type(np
, "cpu") {
2109 unsigned int plen
, t
;
2111 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
2112 * fallback to "reg" property and assume no threads
2114 intserv
= (u32
*)get_property(np
, "ibm,ppc-interrupt-server#s",
2116 if (intserv
== NULL
) {
2117 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
2120 if (*reg
== hardid
) {
2126 plen
/= sizeof(u32
);
2127 for (t
= 0; t
< plen
; t
++) {
2128 if (hardid
== intserv
[t
]) {
2140 static struct debugfs_blob_wrapper flat_dt_blob
;
2142 static int __init
export_flat_device_tree(void)
2146 d
= debugfs_create_dir("powerpc", NULL
);
2150 flat_dt_blob
.data
= initial_boot_params
;
2151 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
2153 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
2160 __initcall(export_flat_device_tree
);