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>
34 #include <linux/lmb.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/phyp_dump.h>
55 #include <asm/kexec.h>
56 #include <mm/mmu_decl.h>
59 #define DBG(fmt...) printk(KERN_ERR fmt)
65 int __initdata iommu_is_off
;
66 int __initdata iommu_force_on
;
67 unsigned long tce_alloc_start
, tce_alloc_end
;
70 extern rwlock_t devtree_lock
; /* temporary while merging */
72 /* export that to outside world */
73 struct device_node
*of_chosen
;
75 static int __init
early_parse_mem(char *p
)
80 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
81 DBG("memory limit = 0x%llx\n", (unsigned long long)memory_limit
);
85 early_param("mem", early_parse_mem
);
88 * move_device_tree - move tree to an unused area, if needed.
90 * The device tree may be allocated beyond our memory limit, or inside the
91 * crash kernel region for kdump. If so, move it out of the way.
93 static void __init
move_device_tree(void)
95 unsigned long start
, size
;
98 DBG("-> move_device_tree\n");
100 start
= __pa(initial_boot_params
);
101 size
= initial_boot_params
->totalsize
;
103 if ((memory_limit
&& (start
+ size
) > memory_limit
) ||
104 overlaps_crashkernel(start
, size
)) {
105 p
= __va(lmb_alloc_base(size
, PAGE_SIZE
, lmb
.rmo_size
));
106 memcpy(p
, initial_boot_params
, size
);
107 initial_boot_params
= (struct boot_param_header
*)p
;
108 DBG("Moved device tree to 0x%p\n", p
);
111 DBG("<- move_device_tree\n");
115 * ibm,pa-features is a per-cpu property that contains a string of
116 * attribute descriptors, each of which has a 2 byte header plus up
117 * to 254 bytes worth of processor attribute bits. First header
118 * byte specifies the number of bytes following the header.
119 * Second header byte is an "attribute-specifier" type, of which
120 * zero is the only currently-defined value.
121 * Implementation: Pass in the byte and bit offset for the feature
122 * that we are interested in. The function will return -1 if the
123 * pa-features property is missing, or a 1/0 to indicate if the feature
124 * is supported/not supported. Note that the bit numbers are
125 * big-endian to match the definition in PAPR.
127 static struct ibm_pa_feature
{
128 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
129 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
130 unsigned char pabyte
; /* byte number in ibm,pa-features */
131 unsigned char pabit
; /* bit number (big-endian) */
132 unsigned char invert
; /* if 1, pa bit set => clear feature */
133 } ibm_pa_features
[] __initdata
= {
134 {0, PPC_FEATURE_HAS_MMU
, 0, 0, 0},
135 {0, PPC_FEATURE_HAS_FPU
, 0, 1, 0},
136 {CPU_FTR_SLB
, 0, 0, 2, 0},
137 {CPU_FTR_CTRL
, 0, 0, 3, 0},
138 {CPU_FTR_NOEXECUTE
, 0, 0, 6, 0},
139 {CPU_FTR_NODSISRALIGN
, 0, 1, 1, 1},
140 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
141 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
144 static void __init
scan_features(unsigned long node
, unsigned char *ftrs
,
145 unsigned long tablelen
,
146 struct ibm_pa_feature
*fp
,
147 unsigned long ft_size
)
149 unsigned long i
, len
, bit
;
151 /* find descriptor with type == 0 */
157 return; /* descriptor 0 not found */
164 /* loop over bits we know about */
165 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
166 if (fp
->pabyte
>= ftrs
[0])
168 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
169 if (bit
^ fp
->invert
) {
170 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
171 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
173 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
174 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
179 static void __init
check_cpu_pa_features(unsigned long node
)
181 unsigned char *pa_ftrs
;
182 unsigned long tablelen
;
184 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
188 scan_features(node
, pa_ftrs
, tablelen
,
189 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
192 #ifdef CONFIG_PPC_STD_MMU_64
193 static void __init
check_cpu_slb_size(unsigned long node
)
197 slb_size_ptr
= of_get_flat_dt_prop(node
, "slb-size", NULL
);
198 if (slb_size_ptr
!= NULL
) {
199 mmu_slb_size
= *slb_size_ptr
;
202 slb_size_ptr
= of_get_flat_dt_prop(node
, "ibm,slb-size", NULL
);
203 if (slb_size_ptr
!= NULL
) {
204 mmu_slb_size
= *slb_size_ptr
;
208 #define check_cpu_slb_size(node) do { } while(0)
211 static struct feature_property
{
214 unsigned long cpu_feature
;
215 unsigned long cpu_user_ftr
;
216 } feature_properties
[] __initdata
= {
217 #ifdef CONFIG_ALTIVEC
218 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
219 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
220 #endif /* CONFIG_ALTIVEC */
222 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
223 {"ibm,vmx", 2, CPU_FTR_VSX
, PPC_FEATURE_HAS_VSX
},
224 #endif /* CONFIG_VSX */
226 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
227 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
228 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
229 #endif /* CONFIG_PPC64 */
232 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
233 static inline void identical_pvr_fixup(unsigned long node
)
236 char *model
= of_get_flat_dt_prop(node
, "model", NULL
);
239 * Since 440GR(x)/440EP(x) processors have the same pvr,
240 * we check the node path and set bit 28 in the cur_cpu_spec
241 * pvr for EP(x) processor version. This bit is always 0 in
242 * the "real" pvr. Then we call identify_cpu again with
243 * the new logical pvr to enable FPU support.
245 if (model
&& strstr(model
, "440EP")) {
246 pvr
= cur_cpu_spec
->pvr_value
| 0x8;
247 identify_cpu(0, pvr
);
248 DBG("Using logical pvr %x for %s\n", pvr
, model
);
252 #define identical_pvr_fixup(node) do { } while(0)
255 static void __init
check_cpu_feature_properties(unsigned long node
)
258 struct feature_property
*fp
= feature_properties
;
261 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
262 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
263 if (prop
&& *prop
>= fp
->min_value
) {
264 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
265 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
270 static int __init
early_init_dt_scan_cpus(unsigned long node
,
271 const char *uname
, int depth
,
274 static int logical_cpuid
= 0;
275 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
282 /* We are scanning "cpu" nodes only */
283 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
286 /* Get physical cpuid */
287 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
289 nthreads
= len
/ sizeof(int);
291 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
296 * Now see if any of these threads match our boot cpu.
297 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
299 for (i
= 0; i
< nthreads
; i
++) {
301 * version 2 of the kexec param format adds the phys cpuid of
304 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
306 initial_boot_params
->boot_cpuid_phys
) {
312 * Check if it's the boot-cpu, set it's hw index now,
313 * unfortunately this format did not support booting
314 * off secondary threads.
316 if (of_get_flat_dt_prop(node
,
317 "linux,boot-cpu", NULL
) != NULL
) {
324 /* logical cpu id is always 0 on UP kernels */
330 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
332 boot_cpuid
= logical_cpuid
;
333 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
336 * PAPR defines "logical" PVR values for cpus that
337 * meet various levels of the architecture:
338 * 0x0f000001 Architecture version 2.04
339 * 0x0f000002 Architecture version 2.05
340 * If the cpu-version property in the cpu node contains
341 * such a value, we call identify_cpu again with the
342 * logical PVR value in order to use the cpu feature
343 * bits appropriate for the architecture level.
345 * A POWER6 partition in "POWER6 architected" mode
346 * uses the 0x0f000002 PVR value; in POWER5+ mode
347 * it uses 0x0f000001.
349 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
350 if (prop
&& (*prop
& 0xff000000) == 0x0f000000)
351 identify_cpu(0, *prop
);
353 identical_pvr_fixup(node
);
356 check_cpu_feature_properties(node
);
357 check_cpu_pa_features(node
);
358 check_cpu_slb_size(node
);
360 #ifdef CONFIG_PPC_PSERIES
362 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
364 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
370 void __init
early_init_dt_scan_chosen_arch(unsigned long node
)
372 unsigned long *lprop
;
375 /* check if iommu is forced on or off */
376 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
378 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
382 /* mem=x on the command line is the preferred mechanism */
383 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
385 memory_limit
= *lprop
;
388 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
390 tce_alloc_start
= *lprop
;
391 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
393 tce_alloc_end
= *lprop
;
397 lprop
= of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
399 crashk_res
.start
= *lprop
;
401 lprop
= of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
403 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
407 #ifdef CONFIG_PPC_PSERIES
409 * Interpret the ibm,dynamic-memory property in the
410 * /ibm,dynamic-reconfiguration-memory node.
411 * This contains a list of memory blocks along with NUMA affinity
414 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
416 __be32
*dm
, *ls
, *usm
;
417 unsigned long l
, n
, flags
;
418 u64 base
, size
, lmb_size
;
419 unsigned int is_kexec_kdump
= 0, rngs
;
421 ls
= of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
422 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(__be32
))
424 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
426 dm
= of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
427 if (dm
== NULL
|| l
< sizeof(__be32
))
430 n
= *dm
++; /* number of entries */
431 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(__be32
))
434 /* check if this is a kexec/kdump kernel. */
435 usm
= of_get_flat_dt_prop(node
, "linux,drconf-usable-memory",
440 for (; n
!= 0; --n
) {
441 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
443 /* skip DRC index, pad, assoc. list index, flags */
445 /* skip this block if the reserved bit is set in flags (0x80)
446 or if the block is not assigned to this partition (0x8) */
447 if ((flags
& 0x80) || !(flags
& 0x8))
451 if (is_kexec_kdump
) {
453 * For each lmb in ibm,dynamic-memory, a corresponding
454 * entry in linux,drconf-usable-memory property contains
455 * a counter 'p' followed by 'p' (base, size) duple.
456 * Now read the counter from
457 * linux,drconf-usable-memory property
459 rngs
= dt_mem_next_cell(dt_root_size_cells
, &usm
);
460 if (!rngs
) /* there are no (base, size) duple */
464 if (is_kexec_kdump
) {
465 base
= dt_mem_next_cell(dt_root_addr_cells
,
467 size
= dt_mem_next_cell(dt_root_size_cells
,
471 if (base
>= 0x80000000ul
)
473 if ((base
+ size
) > 0x80000000ul
)
474 size
= 0x80000000ul
- base
;
483 #define early_init_dt_scan_drconf_memory(node) 0
484 #endif /* CONFIG_PPC_PSERIES */
486 static int __init
early_init_dt_scan_memory(unsigned long node
,
487 const char *uname
, int depth
, void *data
)
489 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
493 /* Look for the ibm,dynamic-reconfiguration-memory node */
495 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
496 return early_init_dt_scan_drconf_memory(node
);
498 /* We are scanning "memory" nodes only */
501 * The longtrail doesn't have a device_type on the
502 * /memory node, so look for the node called /memory@0.
504 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
506 } else if (strcmp(type
, "memory") != 0)
509 reg
= of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
511 reg
= of_get_flat_dt_prop(node
, "reg", &l
);
515 endp
= reg
+ (l
/ sizeof(__be32
));
517 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
518 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
520 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
523 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
524 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
528 DBG(" - %llx , %llx\n", (unsigned long long)base
,
529 (unsigned long long)size
);
532 if (base
>= 0x80000000ul
)
534 if ((base
+ size
) > 0x80000000ul
)
535 size
= 0x80000000ul
- base
;
540 memstart_addr
= min((u64
)memstart_addr
, base
);
546 static void __init
early_reserve_mem(void)
550 unsigned long self_base
;
551 unsigned long self_size
;
553 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
554 initial_boot_params
->off_mem_rsvmap
);
556 /* before we do anything, lets reserve the dt blob */
557 self_base
= __pa((unsigned long)initial_boot_params
);
558 self_size
= initial_boot_params
->totalsize
;
559 lmb_reserve(self_base
, self_size
);
561 #ifdef CONFIG_BLK_DEV_INITRD
562 /* then reserve the initrd, if any */
563 if (initrd_start
&& (initrd_end
> initrd_start
))
564 lmb_reserve(__pa(initrd_start
), initrd_end
- initrd_start
);
565 #endif /* CONFIG_BLK_DEV_INITRD */
569 * Handle the case where we might be booting from an old kexec
570 * image that setup the mem_rsvmap as pairs of 32-bit values
572 if (*reserve_map
> 0xffffffffull
) {
573 u32 base_32
, size_32
;
574 u32
*reserve_map_32
= (u32
*)reserve_map
;
577 base_32
= *(reserve_map_32
++);
578 size_32
= *(reserve_map_32
++);
581 /* skip if the reservation is for the blob */
582 if (base_32
== self_base
&& size_32
== self_size
)
584 DBG("reserving: %x -> %x\n", base_32
, size_32
);
585 lmb_reserve(base_32
, size_32
);
591 base
= *(reserve_map
++);
592 size
= *(reserve_map
++);
595 DBG("reserving: %llx -> %llx\n", base
, size
);
596 lmb_reserve(base
, size
);
600 #ifdef CONFIG_PHYP_DUMP
602 * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
604 * Function to find the largest size we need to reserve
605 * during early boot process.
607 * It either looks for boot param and returns that OR
608 * returns larger of 256 or 5% rounded down to multiples of 256MB.
611 static inline unsigned long phyp_dump_calculate_reserve_size(void)
615 if (phyp_dump_info
->reserve_bootvar
)
616 return phyp_dump_info
->reserve_bootvar
;
618 /* divide by 20 to get 5% of value */
619 tmp
= lmb_end_of_DRAM();
622 /* round it down in multiples of 256 */
623 tmp
= tmp
& ~0x0FFFFFFFUL
;
625 return (tmp
> PHYP_DUMP_RMR_END
? tmp
: PHYP_DUMP_RMR_END
);
629 * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
631 * This routine may reserve memory regions in the kernel only
632 * if the system is supported and a dump was taken in last
633 * boot instance or if the hardware is supported and the
634 * scratch area needs to be setup. In other instances it returns
635 * without reserving anything. The memory in case of dump being
636 * active is freed when the dump is collected (by userland tools).
638 static void __init
phyp_dump_reserve_mem(void)
640 unsigned long base
, size
;
641 unsigned long variable_reserve_size
;
643 if (!phyp_dump_info
->phyp_dump_configured
) {
644 printk(KERN_ERR
"Phyp-dump not supported on this hardware\n");
648 if (!phyp_dump_info
->phyp_dump_at_boot
) {
649 printk(KERN_INFO
"Phyp-dump disabled at boot time\n");
653 variable_reserve_size
= phyp_dump_calculate_reserve_size();
655 if (phyp_dump_info
->phyp_dump_is_active
) {
656 /* Reserve *everything* above RMR.Area freed by userland tools*/
657 base
= variable_reserve_size
;
658 size
= lmb_end_of_DRAM() - base
;
660 /* XXX crashed_ram_end is wrong, since it may be beyond
661 * the memory_limit, it will need to be adjusted. */
662 lmb_reserve(base
, size
);
664 phyp_dump_info
->init_reserve_start
= base
;
665 phyp_dump_info
->init_reserve_size
= size
;
667 size
= phyp_dump_info
->cpu_state_size
+
668 phyp_dump_info
->hpte_region_size
+
669 variable_reserve_size
;
670 base
= lmb_end_of_DRAM() - size
;
671 lmb_reserve(base
, size
);
672 phyp_dump_info
->init_reserve_start
= base
;
673 phyp_dump_info
->init_reserve_size
= size
;
677 static inline void __init
phyp_dump_reserve_mem(void) {}
678 #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
681 void __init
early_init_devtree(void *params
)
685 DBG(" -> early_init_devtree(%p)\n", params
);
687 /* Setup flat device-tree pointer */
688 initial_boot_params
= params
;
690 #ifdef CONFIG_PPC_RTAS
691 /* Some machines might need RTAS info for debugging, grab it now. */
692 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
695 #ifdef CONFIG_PHYP_DUMP
696 /* scan tree to see if dump occured during last boot */
697 of_scan_flat_dt(early_init_dt_scan_phyp_dump
, NULL
);
700 /* Retrieve various informations from the /chosen node of the
701 * device-tree, including the platform type, initrd location and
702 * size, TCE reserve, and more ...
704 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
706 /* Scan memory nodes and rebuild LMBs */
708 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
709 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
711 /* Save command line for /proc/cmdline and then parse parameters */
712 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
715 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
716 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
717 /* If relocatable, reserve first 32k for interrupt vectors etc. */
718 if (PHYSICAL_START
> MEMORY_START
)
719 lmb_reserve(MEMORY_START
, 0x8000);
720 reserve_kdump_trampoline();
721 reserve_crashkernel();
723 phyp_dump_reserve_mem();
725 limit
= memory_limit
;
729 /* Ensure that total memory size is page-aligned, because
730 * otherwise mark_bootmem() gets upset. */
732 memsize
= lmb_phys_mem_size();
733 if ((memsize
& PAGE_MASK
) != memsize
)
734 limit
= memsize
& PAGE_MASK
;
736 lmb_enforce_memory_limit(limit
);
741 DBG("Phys. mem: %llx\n", lmb_phys_mem_size());
743 /* We may need to relocate the flat tree, do it now.
744 * FIXME .. and the initrd too? */
747 DBG("Scanning CPUs ...\n");
749 /* Retreive CPU related informations from the flat tree
750 * (altivec support, boot CPU ID, ...)
752 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
754 DBG(" <- early_init_devtree()\n");
759 * New implementation of the OF "find" APIs, return a refcounted
760 * object, call of_node_put() when done. The device tree and list
761 * are protected by a rw_lock.
763 * Note that property management will need some locking as well,
764 * this isn't dealt with yet.
769 * of_find_node_by_phandle - Find a node given a phandle
770 * @handle: phandle of the node to find
772 * Returns a node pointer with refcount incremented, use
773 * of_node_put() on it when done.
775 struct device_node
*of_find_node_by_phandle(phandle handle
)
777 struct device_node
*np
;
779 read_lock(&devtree_lock
);
780 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
781 if (np
->phandle
== handle
)
784 read_unlock(&devtree_lock
);
787 EXPORT_SYMBOL(of_find_node_by_phandle
);
790 * of_find_next_cache_node - Find a node's subsidiary cache
791 * @np: node of type "cpu" or "cache"
793 * Returns a node pointer with refcount incremented, use
794 * of_node_put() on it when done. Caller should hold a reference
797 struct device_node
*of_find_next_cache_node(struct device_node
*np
)
799 struct device_node
*child
;
800 const phandle
*handle
;
802 handle
= of_get_property(np
, "l2-cache", NULL
);
804 handle
= of_get_property(np
, "next-level-cache", NULL
);
807 return of_find_node_by_phandle(*handle
);
809 /* OF on pmac has nodes instead of properties named "l2-cache"
812 if (!strcmp(np
->type
, "cpu"))
813 for_each_child_of_node(np
, child
)
814 if (!strcmp(child
->type
, "cache"))
820 #ifdef CONFIG_PPC_PSERIES
822 * Fix up the uninitialized fields in a new device node:
823 * name, type and pci-specific fields
826 static int of_finish_dynamic_node(struct device_node
*node
)
828 struct device_node
*parent
= of_get_parent(node
);
830 const phandle
*ibm_phandle
;
832 node
->name
= of_get_property(node
, "name", NULL
);
833 node
->type
= of_get_property(node
, "device_type", NULL
);
836 node
->name
= "<NULL>";
838 node
->type
= "<NULL>";
845 /* We don't support that function on PowerMac, at least
848 if (machine_is(powermac
))
851 /* fix up new node's phandle field */
852 if ((ibm_phandle
= of_get_property(node
, "ibm,phandle", NULL
)))
853 node
->phandle
= *ibm_phandle
;
860 static int prom_reconfig_notifier(struct notifier_block
*nb
,
861 unsigned long action
, void *node
)
866 case PSERIES_RECONFIG_ADD
:
867 err
= of_finish_dynamic_node(node
);
869 printk(KERN_ERR
"finish_node returned %d\n", err
);
880 static struct notifier_block prom_reconfig_nb
= {
881 .notifier_call
= prom_reconfig_notifier
,
882 .priority
= 10, /* This one needs to run first */
885 static int __init
prom_reconfig_setup(void)
887 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
889 __initcall(prom_reconfig_setup
);
892 /* Find the device node for a given logical cpu number, also returns the cpu
893 * local thread number (index in ibm,interrupt-server#s) if relevant and
894 * asked for (non NULL)
896 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
899 struct device_node
*np
;
901 hardid
= get_hard_smp_processor_id(cpu
);
903 for_each_node_by_type(np
, "cpu") {
905 unsigned int plen
, t
;
907 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
908 * fallback to "reg" property and assume no threads
910 intserv
= of_get_property(np
, "ibm,ppc-interrupt-server#s",
912 if (intserv
== NULL
) {
913 const u32
*reg
= of_get_property(np
, "reg", NULL
);
916 if (*reg
== hardid
) {
923 for (t
= 0; t
< plen
; t
++) {
924 if (hardid
== intserv
[t
]) {
934 EXPORT_SYMBOL(of_get_cpu_node
);
936 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
937 static struct debugfs_blob_wrapper flat_dt_blob
;
939 static int __init
export_flat_device_tree(void)
943 flat_dt_blob
.data
= initial_boot_params
;
944 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
946 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
947 powerpc_debugfs_root
, &flat_dt_blob
);
953 __initcall(export_flat_device_tree
);