Add linux-next specific files for 20110831
[linux-2.6/next.git] / arch / powerpc / kernel / prom.c
blobda1cb57571d7697ab08724ae2dfd57bd353117e5
1 /*
2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
6 *
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.
16 #undef DEBUG
18 #include <stdarg.h>
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/export.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/memblock.h>
36 #include <asm/prom.h>
37 #include <asm/rtas.h>
38 #include <asm/page.h>
39 #include <asm/processor.h>
40 #include <asm/irq.h>
41 #include <asm/io.h>
42 #include <asm/kdump.h>
43 #include <asm/smp.h>
44 #include <asm/system.h>
45 #include <asm/mmu.h>
46 #include <asm/paca.h>
47 #include <asm/pgtable.h>
48 #include <asm/pci.h>
49 #include <asm/iommu.h>
50 #include <asm/btext.h>
51 #include <asm/sections.h>
52 #include <asm/machdep.h>
53 #include <asm/pSeries_reconfig.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/phyp_dump.h>
56 #include <asm/kexec.h>
57 #include <mm/mmu_decl.h>
59 #ifdef DEBUG
60 #define DBG(fmt...) printk(KERN_ERR fmt)
61 #else
62 #define DBG(fmt...)
63 #endif
65 #ifdef CONFIG_PPC64
66 int __initdata iommu_is_off;
67 int __initdata iommu_force_on;
68 unsigned long tce_alloc_start, tce_alloc_end;
69 u64 ppc64_rma_size;
70 #endif
71 static phys_addr_t first_memblock_size;
72 static int __initdata boot_cpu_count;
74 static int __init early_parse_mem(char *p)
76 if (!p)
77 return 1;
79 memory_limit = PAGE_ALIGN(memparse(p, &p));
80 DBG("memory limit = 0x%llx\n", (unsigned long long)memory_limit);
82 return 0;
84 early_param("mem", early_parse_mem);
87 * overlaps_initrd - check for overlap with page aligned extension of
88 * initrd.
90 static inline int overlaps_initrd(unsigned long start, unsigned long size)
92 #ifdef CONFIG_BLK_DEV_INITRD
93 if (!initrd_start)
94 return 0;
96 return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
97 start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
98 #else
99 return 0;
100 #endif
104 * move_device_tree - move tree to an unused area, if needed.
106 * The device tree may be allocated beyond our memory limit, or inside the
107 * crash kernel region for kdump, or within the page aligned range of initrd.
108 * If so, move it out of the way.
110 static void __init move_device_tree(void)
112 unsigned long start, size;
113 void *p;
115 DBG("-> move_device_tree\n");
117 start = __pa(initial_boot_params);
118 size = be32_to_cpu(initial_boot_params->totalsize);
120 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
121 overlaps_crashkernel(start, size) ||
122 overlaps_initrd(start, size)) {
123 p = __va(memblock_alloc(size, PAGE_SIZE));
124 memcpy(p, initial_boot_params, size);
125 initial_boot_params = (struct boot_param_header *)p;
126 DBG("Moved device tree to 0x%p\n", p);
129 DBG("<- move_device_tree\n");
133 * ibm,pa-features is a per-cpu property that contains a string of
134 * attribute descriptors, each of which has a 2 byte header plus up
135 * to 254 bytes worth of processor attribute bits. First header
136 * byte specifies the number of bytes following the header.
137 * Second header byte is an "attribute-specifier" type, of which
138 * zero is the only currently-defined value.
139 * Implementation: Pass in the byte and bit offset for the feature
140 * that we are interested in. The function will return -1 if the
141 * pa-features property is missing, or a 1/0 to indicate if the feature
142 * is supported/not supported. Note that the bit numbers are
143 * big-endian to match the definition in PAPR.
145 static struct ibm_pa_feature {
146 unsigned long cpu_features; /* CPU_FTR_xxx bit */
147 unsigned long mmu_features; /* MMU_FTR_xxx bit */
148 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
149 unsigned char pabyte; /* byte number in ibm,pa-features */
150 unsigned char pabit; /* bit number (big-endian) */
151 unsigned char invert; /* if 1, pa bit set => clear feature */
152 } ibm_pa_features[] __initdata = {
153 {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
154 {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
155 {0, MMU_FTR_SLB, 0, 0, 2, 0},
156 {CPU_FTR_CTRL, 0, 0, 0, 3, 0},
157 {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0},
158 {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
159 {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
160 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
163 static void __init scan_features(unsigned long node, unsigned char *ftrs,
164 unsigned long tablelen,
165 struct ibm_pa_feature *fp,
166 unsigned long ft_size)
168 unsigned long i, len, bit;
170 /* find descriptor with type == 0 */
171 for (;;) {
172 if (tablelen < 3)
173 return;
174 len = 2 + ftrs[0];
175 if (tablelen < len)
176 return; /* descriptor 0 not found */
177 if (ftrs[1] == 0)
178 break;
179 tablelen -= len;
180 ftrs += len;
183 /* loop over bits we know about */
184 for (i = 0; i < ft_size; ++i, ++fp) {
185 if (fp->pabyte >= ftrs[0])
186 continue;
187 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
188 if (bit ^ fp->invert) {
189 cur_cpu_spec->cpu_features |= fp->cpu_features;
190 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
191 cur_cpu_spec->mmu_features |= fp->mmu_features;
192 } else {
193 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
194 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
195 cur_cpu_spec->mmu_features &= ~fp->mmu_features;
200 static void __init check_cpu_pa_features(unsigned long node)
202 unsigned char *pa_ftrs;
203 unsigned long tablelen;
205 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
206 if (pa_ftrs == NULL)
207 return;
209 scan_features(node, pa_ftrs, tablelen,
210 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
213 #ifdef CONFIG_PPC_STD_MMU_64
214 static void __init check_cpu_slb_size(unsigned long node)
216 u32 *slb_size_ptr;
218 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
219 if (slb_size_ptr != NULL) {
220 mmu_slb_size = *slb_size_ptr;
221 return;
223 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
224 if (slb_size_ptr != NULL) {
225 mmu_slb_size = *slb_size_ptr;
228 #else
229 #define check_cpu_slb_size(node) do { } while(0)
230 #endif
232 static struct feature_property {
233 const char *name;
234 u32 min_value;
235 unsigned long cpu_feature;
236 unsigned long cpu_user_ftr;
237 } feature_properties[] __initdata = {
238 #ifdef CONFIG_ALTIVEC
239 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
240 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
241 #endif /* CONFIG_ALTIVEC */
242 #ifdef CONFIG_VSX
243 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
244 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
245 #endif /* CONFIG_VSX */
246 #ifdef CONFIG_PPC64
247 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
248 {"ibm,purr", 1, CPU_FTR_PURR, 0},
249 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
250 #endif /* CONFIG_PPC64 */
253 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
254 static inline void identical_pvr_fixup(unsigned long node)
256 unsigned int pvr;
257 char *model = of_get_flat_dt_prop(node, "model", NULL);
260 * Since 440GR(x)/440EP(x) processors have the same pvr,
261 * we check the node path and set bit 28 in the cur_cpu_spec
262 * pvr for EP(x) processor version. This bit is always 0 in
263 * the "real" pvr. Then we call identify_cpu again with
264 * the new logical pvr to enable FPU support.
266 if (model && strstr(model, "440EP")) {
267 pvr = cur_cpu_spec->pvr_value | 0x8;
268 identify_cpu(0, pvr);
269 DBG("Using logical pvr %x for %s\n", pvr, model);
272 #else
273 #define identical_pvr_fixup(node) do { } while(0)
274 #endif
276 static void __init check_cpu_feature_properties(unsigned long node)
278 unsigned long i;
279 struct feature_property *fp = feature_properties;
280 const u32 *prop;
282 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
283 prop = of_get_flat_dt_prop(node, fp->name, NULL);
284 if (prop && *prop >= fp->min_value) {
285 cur_cpu_spec->cpu_features |= fp->cpu_feature;
286 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
291 static int __init early_init_dt_scan_cpus(unsigned long node,
292 const char *uname, int depth,
293 void *data)
295 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
296 const u32 *prop;
297 const u32 *intserv;
298 int i, nthreads;
299 unsigned long len;
300 int found = -1;
301 int found_thread = 0;
303 /* We are scanning "cpu" nodes only */
304 if (type == NULL || strcmp(type, "cpu") != 0)
305 return 0;
307 /* Get physical cpuid */
308 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
309 if (intserv) {
310 nthreads = len / sizeof(int);
311 } else {
312 intserv = of_get_flat_dt_prop(node, "reg", NULL);
313 nthreads = 1;
317 * Now see if any of these threads match our boot cpu.
318 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
320 for (i = 0; i < nthreads; i++) {
322 * version 2 of the kexec param format adds the phys cpuid of
323 * booted proc.
325 if (initial_boot_params->version >= 2) {
326 if (intserv[i] == initial_boot_params->boot_cpuid_phys) {
327 found = boot_cpu_count;
328 found_thread = i;
330 } else {
332 * Check if it's the boot-cpu, set it's hw index now,
333 * unfortunately this format did not support booting
334 * off secondary threads.
336 if (of_get_flat_dt_prop(node,
337 "linux,boot-cpu", NULL) != NULL)
338 found = boot_cpu_count;
340 #ifdef CONFIG_SMP
341 /* logical cpu id is always 0 on UP kernels */
342 boot_cpu_count++;
343 #endif
346 if (found >= 0) {
347 DBG("boot cpu: logical %d physical %d\n", found,
348 intserv[found_thread]);
349 boot_cpuid = found;
350 set_hard_smp_processor_id(found, intserv[found_thread]);
353 * PAPR defines "logical" PVR values for cpus that
354 * meet various levels of the architecture:
355 * 0x0f000001 Architecture version 2.04
356 * 0x0f000002 Architecture version 2.05
357 * If the cpu-version property in the cpu node contains
358 * such a value, we call identify_cpu again with the
359 * logical PVR value in order to use the cpu feature
360 * bits appropriate for the architecture level.
362 * A POWER6 partition in "POWER6 architected" mode
363 * uses the 0x0f000002 PVR value; in POWER5+ mode
364 * it uses 0x0f000001.
366 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
367 if (prop && (*prop & 0xff000000) == 0x0f000000)
368 identify_cpu(0, *prop);
370 identical_pvr_fixup(node);
373 check_cpu_feature_properties(node);
374 check_cpu_pa_features(node);
375 check_cpu_slb_size(node);
377 #ifdef CONFIG_PPC_PSERIES
378 if (nthreads > 1)
379 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
380 else
381 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
382 #endif
384 return 0;
387 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
388 int depth, void *data)
390 unsigned long *lprop;
392 /* Use common scan routine to determine if this is the chosen node */
393 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
394 return 0;
396 #ifdef CONFIG_PPC64
397 /* check if iommu is forced on or off */
398 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
399 iommu_is_off = 1;
400 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
401 iommu_force_on = 1;
402 #endif
404 /* mem=x on the command line is the preferred mechanism */
405 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
406 if (lprop)
407 memory_limit = *lprop;
409 #ifdef CONFIG_PPC64
410 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
411 if (lprop)
412 tce_alloc_start = *lprop;
413 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
414 if (lprop)
415 tce_alloc_end = *lprop;
416 #endif
418 #ifdef CONFIG_KEXEC
419 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
420 if (lprop)
421 crashk_res.start = *lprop;
423 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
424 if (lprop)
425 crashk_res.end = crashk_res.start + *lprop - 1;
426 #endif
428 /* break now */
429 return 1;
432 #ifdef CONFIG_PPC_PSERIES
434 * Interpret the ibm,dynamic-memory property in the
435 * /ibm,dynamic-reconfiguration-memory node.
436 * This contains a list of memory blocks along with NUMA affinity
437 * information.
439 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
441 __be32 *dm, *ls, *usm;
442 unsigned long l, n, flags;
443 u64 base, size, memblock_size;
444 unsigned int is_kexec_kdump = 0, rngs;
446 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
447 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
448 return 0;
449 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
451 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
452 if (dm == NULL || l < sizeof(__be32))
453 return 0;
455 n = *dm++; /* number of entries */
456 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
457 return 0;
459 /* check if this is a kexec/kdump kernel. */
460 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
461 &l);
462 if (usm != NULL)
463 is_kexec_kdump = 1;
465 for (; n != 0; --n) {
466 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
467 flags = dm[3];
468 /* skip DRC index, pad, assoc. list index, flags */
469 dm += 4;
470 /* skip this block if the reserved bit is set in flags (0x80)
471 or if the block is not assigned to this partition (0x8) */
472 if ((flags & 0x80) || !(flags & 0x8))
473 continue;
474 size = memblock_size;
475 rngs = 1;
476 if (is_kexec_kdump) {
478 * For each memblock in ibm,dynamic-memory, a corresponding
479 * entry in linux,drconf-usable-memory property contains
480 * a counter 'p' followed by 'p' (base, size) duple.
481 * Now read the counter from
482 * linux,drconf-usable-memory property
484 rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
485 if (!rngs) /* there are no (base, size) duple */
486 continue;
488 do {
489 if (is_kexec_kdump) {
490 base = dt_mem_next_cell(dt_root_addr_cells,
491 &usm);
492 size = dt_mem_next_cell(dt_root_size_cells,
493 &usm);
495 if (iommu_is_off) {
496 if (base >= 0x80000000ul)
497 continue;
498 if ((base + size) > 0x80000000ul)
499 size = 0x80000000ul - base;
501 memblock_add(base, size);
502 } while (--rngs);
504 memblock_dump_all();
505 return 0;
507 #else
508 #define early_init_dt_scan_drconf_memory(node) 0
509 #endif /* CONFIG_PPC_PSERIES */
511 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
512 const char *uname,
513 int depth, void *data)
515 if (depth == 1 &&
516 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
517 return early_init_dt_scan_drconf_memory(node);
519 return early_init_dt_scan_memory(node, uname, depth, data);
522 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
524 #ifdef CONFIG_PPC64
525 if (iommu_is_off) {
526 if (base >= 0x80000000ul)
527 return;
528 if ((base + size) > 0x80000000ul)
529 size = 0x80000000ul - base;
531 #endif
532 /* Keep track of the beginning of memory -and- the size of
533 * the very first block in the device-tree as it represents
534 * the RMA on ppc64 server
536 if (base < memstart_addr) {
537 memstart_addr = base;
538 first_memblock_size = size;
541 /* Add the chunk to the MEMBLOCK list */
542 memblock_add(base, size);
545 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
547 return __va(memblock_alloc(size, align));
550 #ifdef CONFIG_BLK_DEV_INITRD
551 void __init early_init_dt_setup_initrd_arch(unsigned long start,
552 unsigned long end)
554 initrd_start = (unsigned long)__va(start);
555 initrd_end = (unsigned long)__va(end);
556 initrd_below_start_ok = 1;
558 #endif
560 static void __init early_reserve_mem(void)
562 u64 base, size;
563 u64 *reserve_map;
564 unsigned long self_base;
565 unsigned long self_size;
567 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
568 initial_boot_params->off_mem_rsvmap);
570 /* before we do anything, lets reserve the dt blob */
571 self_base = __pa((unsigned long)initial_boot_params);
572 self_size = initial_boot_params->totalsize;
573 memblock_reserve(self_base, self_size);
575 #ifdef CONFIG_BLK_DEV_INITRD
576 /* then reserve the initrd, if any */
577 if (initrd_start && (initrd_end > initrd_start))
578 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
579 _ALIGN_UP(initrd_end, PAGE_SIZE) -
580 _ALIGN_DOWN(initrd_start, PAGE_SIZE));
581 #endif /* CONFIG_BLK_DEV_INITRD */
583 #ifdef CONFIG_PPC32
585 * Handle the case where we might be booting from an old kexec
586 * image that setup the mem_rsvmap as pairs of 32-bit values
588 if (*reserve_map > 0xffffffffull) {
589 u32 base_32, size_32;
590 u32 *reserve_map_32 = (u32 *)reserve_map;
592 while (1) {
593 base_32 = *(reserve_map_32++);
594 size_32 = *(reserve_map_32++);
595 if (size_32 == 0)
596 break;
597 /* skip if the reservation is for the blob */
598 if (base_32 == self_base && size_32 == self_size)
599 continue;
600 DBG("reserving: %x -> %x\n", base_32, size_32);
601 memblock_reserve(base_32, size_32);
603 return;
605 #endif
606 while (1) {
607 base = *(reserve_map++);
608 size = *(reserve_map++);
609 if (size == 0)
610 break;
611 DBG("reserving: %llx -> %llx\n", base, size);
612 memblock_reserve(base, size);
616 #ifdef CONFIG_PHYP_DUMP
618 * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
620 * Function to find the largest size we need to reserve
621 * during early boot process.
623 * It either looks for boot param and returns that OR
624 * returns larger of 256 or 5% rounded down to multiples of 256MB.
627 static inline unsigned long phyp_dump_calculate_reserve_size(void)
629 unsigned long tmp;
631 if (phyp_dump_info->reserve_bootvar)
632 return phyp_dump_info->reserve_bootvar;
634 /* divide by 20 to get 5% of value */
635 tmp = memblock_end_of_DRAM();
636 do_div(tmp, 20);
638 /* round it down in multiples of 256 */
639 tmp = tmp & ~0x0FFFFFFFUL;
641 return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
645 * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
647 * This routine may reserve memory regions in the kernel only
648 * if the system is supported and a dump was taken in last
649 * boot instance or if the hardware is supported and the
650 * scratch area needs to be setup. In other instances it returns
651 * without reserving anything. The memory in case of dump being
652 * active is freed when the dump is collected (by userland tools).
654 static void __init phyp_dump_reserve_mem(void)
656 unsigned long base, size;
657 unsigned long variable_reserve_size;
659 if (!phyp_dump_info->phyp_dump_configured) {
660 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
661 return;
664 if (!phyp_dump_info->phyp_dump_at_boot) {
665 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
666 return;
669 variable_reserve_size = phyp_dump_calculate_reserve_size();
671 if (phyp_dump_info->phyp_dump_is_active) {
672 /* Reserve *everything* above RMR.Area freed by userland tools*/
673 base = variable_reserve_size;
674 size = memblock_end_of_DRAM() - base;
676 /* XXX crashed_ram_end is wrong, since it may be beyond
677 * the memory_limit, it will need to be adjusted. */
678 memblock_reserve(base, size);
680 phyp_dump_info->init_reserve_start = base;
681 phyp_dump_info->init_reserve_size = size;
682 } else {
683 size = phyp_dump_info->cpu_state_size +
684 phyp_dump_info->hpte_region_size +
685 variable_reserve_size;
686 base = memblock_end_of_DRAM() - size;
687 memblock_reserve(base, size);
688 phyp_dump_info->init_reserve_start = base;
689 phyp_dump_info->init_reserve_size = size;
692 #else
693 static inline void __init phyp_dump_reserve_mem(void) {}
694 #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
696 void __init early_init_devtree(void *params)
698 phys_addr_t limit;
700 DBG(" -> early_init_devtree(%p)\n", params);
702 /* Setup flat device-tree pointer */
703 initial_boot_params = params;
705 #ifdef CONFIG_PPC_RTAS
706 /* Some machines might need RTAS info for debugging, grab it now. */
707 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
708 #endif
710 #ifdef CONFIG_PHYP_DUMP
711 /* scan tree to see if dump occurred during last boot */
712 of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
713 #endif
715 /* Retrieve various informations from the /chosen node of the
716 * device-tree, including the platform type, initrd location and
717 * size, TCE reserve, and more ...
719 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
721 /* Scan memory nodes and rebuild MEMBLOCKs */
722 memblock_init();
724 of_scan_flat_dt(early_init_dt_scan_root, NULL);
725 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
726 setup_initial_memory_limit(memstart_addr, first_memblock_size);
728 /* Save command line for /proc/cmdline and then parse parameters */
729 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
730 parse_early_param();
732 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
733 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
734 /* If relocatable, reserve first 32k for interrupt vectors etc. */
735 if (PHYSICAL_START > MEMORY_START)
736 memblock_reserve(MEMORY_START, 0x8000);
737 reserve_kdump_trampoline();
738 reserve_crashkernel();
739 early_reserve_mem();
740 phyp_dump_reserve_mem();
742 limit = memory_limit;
743 if (! limit) {
744 phys_addr_t memsize;
746 /* Ensure that total memory size is page-aligned, because
747 * otherwise mark_bootmem() gets upset. */
748 memblock_analyze();
749 memsize = memblock_phys_mem_size();
750 if ((memsize & PAGE_MASK) != memsize)
751 limit = memsize & PAGE_MASK;
753 memblock_enforce_memory_limit(limit);
755 memblock_analyze();
756 memblock_dump_all();
758 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
760 /* We may need to relocate the flat tree, do it now.
761 * FIXME .. and the initrd too? */
762 move_device_tree();
764 allocate_pacas();
766 DBG("Scanning CPUs ...\n");
768 /* Retrieve CPU related informations from the flat tree
769 * (altivec support, boot CPU ID, ...)
771 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
773 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
774 /* We'll later wait for secondaries to check in; there are
775 * NCPUS-1 non-boot CPUs :-)
777 spinning_secondaries = boot_cpu_count - 1;
778 #endif
780 DBG(" <- early_init_devtree()\n");
783 /*******
785 * New implementation of the OF "find" APIs, return a refcounted
786 * object, call of_node_put() when done. The device tree and list
787 * are protected by a rw_lock.
789 * Note that property management will need some locking as well,
790 * this isn't dealt with yet.
792 *******/
795 * of_find_next_cache_node - Find a node's subsidiary cache
796 * @np: node of type "cpu" or "cache"
798 * Returns a node pointer with refcount incremented, use
799 * of_node_put() on it when done. Caller should hold a reference
800 * to np.
802 struct device_node *of_find_next_cache_node(struct device_node *np)
804 struct device_node *child;
805 const phandle *handle;
807 handle = of_get_property(np, "l2-cache", NULL);
808 if (!handle)
809 handle = of_get_property(np, "next-level-cache", NULL);
811 if (handle)
812 return of_find_node_by_phandle(*handle);
814 /* OF on pmac has nodes instead of properties named "l2-cache"
815 * beneath CPU nodes.
817 if (!strcmp(np->type, "cpu"))
818 for_each_child_of_node(np, child)
819 if (!strcmp(child->type, "cache"))
820 return child;
822 return NULL;
825 #ifdef CONFIG_PPC_PSERIES
827 * Fix up the uninitialized fields in a new device node:
828 * name, type and pci-specific fields
831 static int of_finish_dynamic_node(struct device_node *node)
833 struct device_node *parent = of_get_parent(node);
834 int err = 0;
835 const phandle *ibm_phandle;
837 node->name = of_get_property(node, "name", NULL);
838 node->type = of_get_property(node, "device_type", NULL);
840 if (!node->name)
841 node->name = "<NULL>";
842 if (!node->type)
843 node->type = "<NULL>";
845 if (!parent) {
846 err = -ENODEV;
847 goto out;
850 /* We don't support that function on PowerMac, at least
851 * not yet
853 if (machine_is(powermac))
854 return -ENODEV;
856 /* fix up new node's phandle field */
857 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
858 node->phandle = *ibm_phandle;
860 out:
861 of_node_put(parent);
862 return err;
865 static int prom_reconfig_notifier(struct notifier_block *nb,
866 unsigned long action, void *node)
868 int err;
870 switch (action) {
871 case PSERIES_RECONFIG_ADD:
872 err = of_finish_dynamic_node(node);
873 if (err < 0)
874 printk(KERN_ERR "finish_node returned %d\n", err);
875 break;
876 default:
877 err = 0;
878 break;
880 return notifier_from_errno(err);
883 static struct notifier_block prom_reconfig_nb = {
884 .notifier_call = prom_reconfig_notifier,
885 .priority = 10, /* This one needs to run first */
888 static int __init prom_reconfig_setup(void)
890 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
892 __initcall(prom_reconfig_setup);
893 #endif
895 /* Find the device node for a given logical cpu number, also returns the cpu
896 * local thread number (index in ibm,interrupt-server#s) if relevant and
897 * asked for (non NULL)
899 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
901 int hardid;
902 struct device_node *np;
904 hardid = get_hard_smp_processor_id(cpu);
906 for_each_node_by_type(np, "cpu") {
907 const u32 *intserv;
908 unsigned int plen, t;
910 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
911 * fallback to "reg" property and assume no threads
913 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
914 &plen);
915 if (intserv == NULL) {
916 const u32 *reg = of_get_property(np, "reg", NULL);
917 if (reg == NULL)
918 continue;
919 if (*reg == hardid) {
920 if (thread)
921 *thread = 0;
922 return np;
924 } else {
925 plen /= sizeof(u32);
926 for (t = 0; t < plen; t++) {
927 if (hardid == intserv[t]) {
928 if (thread)
929 *thread = t;
930 return np;
935 return NULL;
937 EXPORT_SYMBOL(of_get_cpu_node);
939 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
940 static struct debugfs_blob_wrapper flat_dt_blob;
942 static int __init export_flat_device_tree(void)
944 struct dentry *d;
946 flat_dt_blob.data = initial_boot_params;
947 flat_dt_blob.size = initial_boot_params->totalsize;
949 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
950 powerpc_debugfs_root, &flat_dt_blob);
951 if (!d)
952 return 1;
954 return 0;
956 __initcall(export_flat_device_tree);
957 #endif