arch/powerpc/kernel/prom.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   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
   9  *
  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.
  14  */
  15
  16 #undef DEBUG
  17
  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/module.h>
  31 #include <linux/kexec.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/irq.h>
  34
  35 #include <asm/prom.h>
  36 #include <asm/rtas.h>
  37 #include <asm/lmb.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/pgtable.h>
  47 #include <asm/pci.h>
  48 #include <asm/iommu.h>
  49 #include <asm/btext.h>
  50 #include <asm/sections.h>
  51 #include <asm/machdep.h>
  52 #include <asm/pSeries_reconfig.h>
  53 #include <asm/pci-bridge.h>
  54 #include <asm/kexec.h>
  55
  56 #ifdef DEBUG
  57 #define DBG(fmt...) printk(KERN_ERR fmt)
  58 #else
  59 #define DBG(fmt...)
  60 #endif
  61
  62
  63 static int __initdata dt_root_addr_cells;
  64 static int __initdata dt_root_size_cells;
  65
  66 #ifdef CONFIG_PPC64
  67 int __initdata iommu_is_off;
  68 int __initdata iommu_force_on;
  69 unsigned long tce_alloc_start, tce_alloc_end;
  70 #endif
  71
  72 typedef u32 cell_t;
  73
  74 #if 0
  75 static struct boot_param_header *initial_boot_params __initdata;
  76 #else
  77 struct boot_param_header *initial_boot_params;
  78 #endif
  79
  80 extern struct device_node *allnodes;    /* temporary while merging */
  81
  82 extern rwlock_t devtree_lock;   /* temporary while merging */
  83
  84 /* export that to outside world */
  85 struct device_node *of_chosen;
  86
  87 static inline char *find_flat_dt_string(u32 offset)
  88 {
  89         return ((char *)initial_boot_params) +
  90                 initial_boot_params->off_dt_strings + offset;
  91 }
  92
  93 /**
  94  * This function is used to scan the flattened device-tree, it is
  95  * used to extract the memory informations at boot before we can
  96  * unflatten the tree
  97  */
  98 int __init of_scan_flat_dt(int (*it)(unsigned long node,
  99                                      const char *uname, int depth,
 100                                      void *data),
 101                            void *data)
 102 {
 103         unsigned long p = ((unsigned long)initial_boot_params) +
 104                 initial_boot_params->off_dt_struct;
 105         int rc = 0;
 106         int depth = -1;
 107
 108         do {
 109                 u32 tag = *((u32 *)p);
 110                 char *pathp;
 111
 112                 p += 4;
 113                 if (tag == OF_DT_END_NODE) {
 114                         depth --;
 115                         continue;
 116                 }
 117                 if (tag == OF_DT_NOP)
 118                         continue;
 119                 if (tag == OF_DT_END)
 120                         break;
 121                 if (tag == OF_DT_PROP) {
 122                         u32 sz = *((u32 *)p);
 123                         p += 8;
 124                         if (initial_boot_params->version < 0x10)
 125                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
 126                         p += sz;
 127                         p = _ALIGN(p, 4);
 128                         continue;
 129                 }
 130                 if (tag != OF_DT_BEGIN_NODE) {
 131                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
 132                                " device tree !\n", tag);
 133                         return -EINVAL;
 134                 }
 135                 depth++;
 136                 pathp = (char *)p;
 137                 p = _ALIGN(p + strlen(pathp) + 1, 4);
 138                 if ((*pathp) == '/') {
 139                         char *lp, *np;
 140                         for (lp = NULL, np = pathp; *np; np++)
 141                                 if ((*np) == '/')
 142                                         lp = np+1;
 143                         if (lp != NULL)
 144                                 pathp = lp;
 145                 }
 146                 rc = it(p, pathp, depth, data);
 147                 if (rc != 0)
 148                         break;
 149         } while(1);
 150
 151         return rc;
 152 }
 153
 154 unsigned long __init of_get_flat_dt_root(void)
 155 {
 156         unsigned long p = ((unsigned long)initial_boot_params) +
 157                 initial_boot_params->off_dt_struct;
 158
 159         while(*((u32 *)p) == OF_DT_NOP)
 160                 p += 4;
 161         BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
 162         p += 4;
 163         return _ALIGN(p + strlen((char *)p) + 1, 4);
 164 }
 165
 166 /**
 167  * This  function can be used within scan_flattened_dt callback to get
 168  * access to properties
 169  */
 170 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
 171                                  unsigned long *size)
 172 {
 173         unsigned long p = node;
 174
 175         do {
 176                 u32 tag = *((u32 *)p);
 177                 u32 sz, noff;
 178                 const char *nstr;
 179
 180                 p += 4;
 181                 if (tag == OF_DT_NOP)
 182                         continue;
 183                 if (tag != OF_DT_PROP)
 184                         return NULL;
 185
 186                 sz = *((u32 *)p);
 187                 noff = *((u32 *)(p + 4));
 188                 p += 8;
 189                 if (initial_boot_params->version < 0x10)
 190                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
 191
 192                 nstr = find_flat_dt_string(noff);
 193                 if (nstr == NULL) {
 194                         printk(KERN_WARNING "Can't find property index"
 195                                " name !\n");
 196                         return NULL;
 197                 }
 198                 if (strcmp(name, nstr) == 0) {
 199                         if (size)
 200                                 *size = sz;
 201                         return (void *)p;
 202                 }
 203                 p += sz;
 204                 p = _ALIGN(p, 4);
 205         } while(1);
 206 }
 207
 208 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
 209 {
 210         const char* cp;
 211         unsigned long cplen, l;
 212
 213         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
 214         if (cp == NULL)
 215                 return 0;
 216         while (cplen > 0) {
 217                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
 218                         return 1;
 219                 l = strlen(cp) + 1;
 220                 cp += l;
 221                 cplen -= l;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
 228                                        unsigned long align)
 229 {
 230         void *res;
 231
 232         *mem = _ALIGN(*mem, align);
 233         res = (void *)*mem;
 234         *mem += size;
 235
 236         return res;
 237 }
 238
 239 static unsigned long __init unflatten_dt_node(unsigned long mem,
 240                                               unsigned long *p,
 241                                               struct device_node *dad,
 242                                               struct device_node ***allnextpp,
 243                                               unsigned long fpsize)
 244 {
 245         struct device_node *np;
 246         struct property *pp, **prev_pp = NULL;
 247         char *pathp;
 248         u32 tag;
 249         unsigned int l, allocl;
 250         int has_name = 0;
 251         int new_format = 0;
 252
 253         tag = *((u32 *)(*p));
 254         if (tag != OF_DT_BEGIN_NODE) {
 255                 printk("Weird tag at start of node: %x\n", tag);
 256                 return mem;
 257         }
 258         *p += 4;
 259         pathp = (char *)*p;
 260         l = allocl = strlen(pathp) + 1;
 261         *p = _ALIGN(*p + l, 4);
 262
 263         /* version 0x10 has a more compact unit name here instead of the full
 264          * path. we accumulate the full path size using "fpsize", we'll rebuild
 265          * it later. We detect this because the first character of the name is
 266          * not '/'.
 267          */
 268         if ((*pathp) != '/') {
 269                 new_format = 1;
 270                 if (fpsize == 0) {
 271                         /* root node: special case. fpsize accounts for path
 272                          * plus terminating zero. root node only has '/', so
 273                          * fpsize should be 2, but we want to avoid the first
 274                          * level nodes to have two '/' so we use fpsize 1 here
 275                          */
 276                         fpsize = 1;
 277                         allocl = 2;
 278                 } else {
 279                         /* account for '/' and path size minus terminal 0
 280                          * already in 'l'
 281                          */
 282                         fpsize += l;
 283                         allocl = fpsize;
 284                 }
 285         }
 286
 287
 288         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
 289                                 __alignof__(struct device_node));
 290         if (allnextpp) {
 291                 memset(np, 0, sizeof(*np));
 292                 np->full_name = ((char*)np) + sizeof(struct device_node);
 293                 if (new_format) {
 294                         char *p = np->full_name;
 295                         /* rebuild full path for new format */
 296                         if (dad && dad->parent) {
 297                                 strcpy(p, dad->full_name);
 298 #ifdef DEBUG
 299                                 if ((strlen(p) + l + 1) != allocl) {
 300                                         DBG("%s: p: %d, l: %d, a: %d\n",
 301                                             pathp, (int)strlen(p), l, allocl);
 302                                 }
 303 #endif
 304                                 p += strlen(p);
 305                         }
 306                         *(p++) = '/';
 307                         memcpy(p, pathp, l);
 308                 } else
 309                         memcpy(np->full_name, pathp, l);
 310                 prev_pp = &np->properties;
 311                 **allnextpp = np;
 312                 *allnextpp = &np->allnext;
 313                 if (dad != NULL) {
 314                         np->parent = dad;
 315                         /* we temporarily use the next field as `last_child'*/
 316                         if (dad->next == 0)
 317                                 dad->child = np;
 318                         else
 319                                 dad->next->sibling = np;
 320                         dad->next = np;
 321                 }
 322                 kref_init(&np->kref);
 323         }
 324         while(1) {
 325                 u32 sz, noff;
 326                 char *pname;
 327
 328                 tag = *((u32 *)(*p));
 329                 if (tag == OF_DT_NOP) {
 330                         *p += 4;
 331                         continue;
 332                 }
 333                 if (tag != OF_DT_PROP)
 334                         break;
 335                 *p += 4;
 336                 sz = *((u32 *)(*p));
 337                 noff = *((u32 *)((*p) + 4));
 338                 *p += 8;
 339                 if (initial_boot_params->version < 0x10)
 340                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
 341
 342                 pname = find_flat_dt_string(noff);
 343                 if (pname == NULL) {
 344                         printk("Can't find property name in list !\n");
 345                         break;
 346                 }
 347                 if (strcmp(pname, "name") == 0)
 348                         has_name = 1;
 349                 l = strlen(pname) + 1;
 350                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
 351                                         __alignof__(struct property));
 352                 if (allnextpp) {
 353                         if (strcmp(pname, "linux,phandle") == 0) {
 354                                 np->node = *((u32 *)*p);
 355                                 if (np->linux_phandle == 0)
 356                                         np->linux_phandle = np->node;
 357                         }
 358                         if (strcmp(pname, "ibm,phandle") == 0)
 359                                 np->linux_phandle = *((u32 *)*p);
 360                         pp->name = pname;
 361                         pp->length = sz;
 362                         pp->value = (void *)*p;
 363                         *prev_pp = pp;
 364                         prev_pp = &pp->next;
 365                 }
 366                 *p = _ALIGN((*p) + sz, 4);
 367         }
 368         /* with version 0x10 we may not have the name property, recreate
 369          * it here from the unit name if absent
 370          */
 371         if (!has_name) {
 372                 char *p = pathp, *ps = pathp, *pa = NULL;
 373                 int sz;
 374
 375                 while (*p) {
 376                         if ((*p) == '@')
 377                                 pa = p;
 378                         if ((*p) == '/')
 379                                 ps = p + 1;
 380                         p++;
 381                 }
 382                 if (pa < ps)
 383                         pa = p;
 384                 sz = (pa - ps) + 1;
 385                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
 386                                         __alignof__(struct property));
 387                 if (allnextpp) {
 388                         pp->name = "name";
 389                         pp->length = sz;
 390                         pp->value = pp + 1;
 391                         *prev_pp = pp;
 392                         prev_pp = &pp->next;
 393                         memcpy(pp->value, ps, sz - 1);
 394                         ((char *)pp->value)[sz - 1] = 0;
 395                         DBG("fixed up name for %s -> %s\n", pathp,
 396                                 (char *)pp->value);
 397                 }
 398         }
 399         if (allnextpp) {
 400                 *prev_pp = NULL;
 401                 np->name = of_get_property(np, "name", NULL);
 402                 np->type = of_get_property(np, "device_type", NULL);
 403
 404                 if (!np->name)
 405                         np->name = "<NULL>";
 406                 if (!np->type)
 407                         np->type = "<NULL>";
 408         }
 409         while (tag == OF_DT_BEGIN_NODE) {
 410                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
 411                 tag = *((u32 *)(*p));
 412         }
 413         if (tag != OF_DT_END_NODE) {
 414                 printk("Weird tag at end of node: %x\n", tag);
 415                 return mem;
 416         }
 417         *p += 4;
 418         return mem;
 419 }
 420
 421 static int __init early_parse_mem(char *p)
 422 {
 423         if (!p)
 424                 return 1;
 425
 426         memory_limit = PAGE_ALIGN(memparse(p, &p));
 427         DBG("memory limit = 0x%lx\n", memory_limit);
 428
 429         return 0;
 430 }
 431 early_param("mem", early_parse_mem);
 432
 433 /**
 434  * move_device_tree - move tree to an unused area, if needed.
 435  *
 436  * The device tree may be allocated beyond our memory limit, or inside the
 437  * crash kernel region for kdump. If so, move it out of the way.
 438  */
 439 static void move_device_tree(void)
 440 {
 441         unsigned long start, size;
 442         void *p;
 443
 444         DBG("-> move_device_tree\n");
 445
 446         start = __pa(initial_boot_params);
 447         size = initial_boot_params->totalsize;
 448
 449         if ((memory_limit && (start + size) > memory_limit) ||
 450                         overlaps_crashkernel(start, size)) {
 451                 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
 452                 memcpy(p, initial_boot_params, size);
 453                 initial_boot_params = (struct boot_param_header *)p;
 454                 DBG("Moved device tree to 0x%p\n", p);
 455         }
 456
 457         DBG("<- move_device_tree\n");
 458 }
 459
 460 /**
 461  * unflattens the device-tree passed by the firmware, creating the
 462  * tree of struct device_node. It also fills the "name" and "type"
 463  * pointers of the nodes so the normal device-tree walking functions
 464  * can be used (this used to be done by finish_device_tree)
 465  */
 466 void __init unflatten_device_tree(void)
 467 {
 468         unsigned long start, mem, size;
 469         struct device_node **allnextp = &allnodes;
 470
 471         DBG(" -> unflatten_device_tree()\n");
 472
 473         /* First pass, scan for size */
 474         start = ((unsigned long)initial_boot_params) +
 475                 initial_boot_params->off_dt_struct;
 476         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
 477         size = (size | 3) + 1;
 478
 479         DBG("  size is %lx, allocating...\n", size);
 480
 481         /* Allocate memory for the expanded device tree */
 482         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
 483         mem = (unsigned long) __va(mem);
 484
 485         ((u32 *)mem)[size / 4] = 0xdeadbeef;
 486
 487         DBG("  unflattening %lx...\n", mem);
 488
 489         /* Second pass, do actual unflattening */
 490         start = ((unsigned long)initial_boot_params) +
 491                 initial_boot_params->off_dt_struct;
 492         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
 493         if (*((u32 *)start) != OF_DT_END)
 494                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
 495         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
 496                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
 497                        ((u32 *)mem)[size / 4] );
 498         *allnextp = NULL;
 499
 500         /* Get pointer to OF "/chosen" node for use everywhere */
 501         of_chosen = of_find_node_by_path("/chosen");
 502         if (of_chosen == NULL)
 503                 of_chosen = of_find_node_by_path("/chosen@0");
 504
 505         DBG(" <- unflatten_device_tree()\n");
 506 }
 507
 508 /*
 509  * ibm,pa-features is a per-cpu property that contains a string of
 510  * attribute descriptors, each of which has a 2 byte header plus up
 511  * to 254 bytes worth of processor attribute bits.  First header
 512  * byte specifies the number of bytes following the header.
 513  * Second header byte is an "attribute-specifier" type, of which
 514  * zero is the only currently-defined value.
 515  * Implementation:  Pass in the byte and bit offset for the feature
 516  * that we are interested in.  The function will return -1 if the
 517  * pa-features property is missing, or a 1/0 to indicate if the feature
 518  * is supported/not supported.  Note that the bit numbers are
 519  * big-endian to match the definition in PAPR.
 520  */
 521 static struct ibm_pa_feature {
 522         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
 523         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
 524         unsigned char   pabyte;         /* byte number in ibm,pa-features */
 525         unsigned char   pabit;          /* bit number (big-endian) */
 526         unsigned char   invert;         /* if 1, pa bit set => clear feature */
 527 } ibm_pa_features[] __initdata = {
 528         {0, PPC_FEATURE_HAS_MMU,        0, 0, 0},
 529         {0, PPC_FEATURE_HAS_FPU,        0, 1, 0},
 530         {CPU_FTR_SLB, 0,                0, 2, 0},
 531         {CPU_FTR_CTRL, 0,               0, 3, 0},
 532         {CPU_FTR_NOEXECUTE, 0,          0, 6, 0},
 533         {CPU_FTR_NODSISRALIGN, 0,       1, 1, 1},
 534         {CPU_FTR_CI_LARGE_PAGE, 0,      1, 2, 0},
 535         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
 536 };
 537
 538 static void __init scan_features(unsigned long node, unsigned char *ftrs,
 539                                  unsigned long tablelen,
 540                                  struct ibm_pa_feature *fp,
 541                                  unsigned long ft_size)
 542 {
 543         unsigned long i, len, bit;
 544
 545         /* find descriptor with type == 0 */
 546         for (;;) {
 547                 if (tablelen < 3)
 548                         return;
 549                 len = 2 + ftrs[0];
 550                 if (tablelen < len)
 551                         return;         /* descriptor 0 not found */
 552                 if (ftrs[1] == 0)
 553                         break;
 554                 tablelen -= len;
 555                 ftrs += len;
 556         }
 557
 558         /* loop over bits we know about */
 559         for (i = 0; i < ft_size; ++i, ++fp) {
 560                 if (fp->pabyte >= ftrs[0])
 561                         continue;
 562                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 563                 if (bit ^ fp->invert) {
 564                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 565                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 566                 } else {
 567                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 568                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 569                 }
 570         }
 571 }
 572
 573 static void __init check_cpu_pa_features(unsigned long node)
 574 {
 575         unsigned char *pa_ftrs;
 576         unsigned long tablelen;
 577
 578         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 579         if (pa_ftrs == NULL)
 580                 return;
 581
 582         scan_features(node, pa_ftrs, tablelen,
 583                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 584 }
 585
 586 #ifdef CONFIG_PPC64
 587 static void __init check_cpu_slb_size(unsigned long node)
 588 {
 589         u32 *slb_size_ptr;
 590
 591         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 592         if (slb_size_ptr != NULL) {
 593                 mmu_slb_size = *slb_size_ptr;
 594         }
 595 }
 596 #else
 597 #define check_cpu_slb_size(node) do { } while(0)
 598 #endif
 599
 600 static struct feature_property {
 601         const char *name;
 602         u32 min_value;
 603         unsigned long cpu_feature;
 604         unsigned long cpu_user_ftr;
 605 } feature_properties[] __initdata = {
 606 #ifdef CONFIG_ALTIVEC
 607         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 608         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 609 #endif /* CONFIG_ALTIVEC */
 610 #ifdef CONFIG_PPC64
 611         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 612         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 613         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 614 #endif /* CONFIG_PPC64 */
 615 };
 616
 617 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 618 static inline void identical_pvr_fixup(unsigned long node)
 619 {
 620         unsigned int pvr;
 621         char *model = of_get_flat_dt_prop(node, "model", NULL);
 622
 623         /*
 624          * Since 440GR(x)/440EP(x) processors have the same pvr,
 625          * we check the node path and set bit 28 in the cur_cpu_spec
 626          * pvr for EP(x) processor version. This bit is always 0 in
 627          * the "real" pvr. Then we call identify_cpu again with
 628          * the new logical pvr to enable FPU support.
 629          */
 630         if (model && strstr(model, "440EP")) {
 631                 pvr = cur_cpu_spec->pvr_value | 0x8;
 632                 identify_cpu(0, pvr);
 633                 DBG("Using logical pvr %x for %s\n", pvr, model);
 634         }
 635 }
 636 #else
 637 #define identical_pvr_fixup(node) do { } while(0)
 638 #endif
 639
 640 static void __init check_cpu_feature_properties(unsigned long node)
 641 {
 642         unsigned long i;
 643         struct feature_property *fp = feature_properties;
 644         const u32 *prop;
 645
 646         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 647                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 648                 if (prop && *prop >= fp->min_value) {
 649                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 650                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 651                 }
 652         }
 653 }
 654
 655 static int __init early_init_dt_scan_cpus(unsigned long node,
 656                                           const char *uname, int depth,
 657                                           void *data)
 658 {
 659         static int logical_cpuid = 0;
 660         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 661         const u32 *prop;
 662         const u32 *intserv;
 663         int i, nthreads;
 664         unsigned long len;
 665         int found = 0;
 666
 667         /* We are scanning "cpu" nodes only */
 668         if (type == NULL || strcmp(type, "cpu") != 0)
 669                 return 0;
 670
 671         /* Get physical cpuid */
 672         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 673         if (intserv) {
 674                 nthreads = len / sizeof(int);
 675         } else {
 676                 intserv = of_get_flat_dt_prop(node, "reg", NULL);
 677                 nthreads = 1;
 678         }
 679
 680         /*
 681          * Now see if any of these threads match our boot cpu.
 682          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 683          */
 684         for (i = 0; i < nthreads; i++) {
 685                 /*
 686                  * version 2 of the kexec param format adds the phys cpuid of
 687                  * booted proc.
 688                  */
 689                 if (initial_boot_params && initial_boot_params->version >= 2) {
 690                         if (intserv[i] ==
 691                                         initial_boot_params->boot_cpuid_phys) {
 692                                 found = 1;
 693                                 break;
 694                         }
 695                 } else {
 696                         /*
 697                          * Check if it's the boot-cpu, set it's hw index now,
 698                          * unfortunately this format did not support booting
 699                          * off secondary threads.
 700                          */
 701                         if (of_get_flat_dt_prop(node,
 702                                         "linux,boot-cpu", NULL) != NULL) {
 703                                 found = 1;
 704                                 break;
 705                         }
 706                 }
 707
 708 #ifdef CONFIG_SMP
 709                 /* logical cpu id is always 0 on UP kernels */
 710                 logical_cpuid++;
 711 #endif
 712         }
 713
 714         if (found) {
 715                 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
 716                         intserv[i]);
 717                 boot_cpuid = logical_cpuid;
 718                 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
 719
 720                 /*
 721                  * PAPR defines "logical" PVR values for cpus that
 722                  * meet various levels of the architecture:
 723                  * 0x0f000001   Architecture version 2.04
 724                  * 0x0f000002   Architecture version 2.05
 725                  * If the cpu-version property in the cpu node contains
 726                  * such a value, we call identify_cpu again with the
 727                  * logical PVR value in order to use the cpu feature
 728                  * bits appropriate for the architecture level.
 729                  *
 730                  * A POWER6 partition in "POWER6 architected" mode
 731                  * uses the 0x0f000002 PVR value; in POWER5+ mode
 732                  * it uses 0x0f000001.
 733                  */
 734                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 735                 if (prop && (*prop & 0xff000000) == 0x0f000000)
 736                         identify_cpu(0, *prop);
 737
 738                 identical_pvr_fixup(node);
 739         }
 740
 741         check_cpu_feature_properties(node);
 742         check_cpu_pa_features(node);
 743         check_cpu_slb_size(node);
 744
 745 #ifdef CONFIG_PPC_PSERIES
 746         if (nthreads > 1)
 747                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 748         else
 749                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 750 #endif
 751
 752         return 0;
 753 }
 754
 755 #ifdef CONFIG_BLK_DEV_INITRD
 756 static void __init early_init_dt_check_for_initrd(unsigned long node)
 757 {
 758         unsigned long l;
 759         u32 *prop;
 760
 761         DBG("Looking for initrd properties... ");
 762
 763         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
 764         if (prop) {
 765                 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
 766
 767                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
 768                 if (prop) {
 769                         initrd_end = (unsigned long)
 770                                         __va(of_read_ulong(prop, l/4));
 771                         initrd_below_start_ok = 1;
 772                 } else {
 773                         initrd_start = 0;
 774                 }
 775         }
 776
 777         DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
 778 }
 779 #else
 780 static inline void early_init_dt_check_for_initrd(unsigned long node)
 781 {
 782 }
 783 #endif /* CONFIG_BLK_DEV_INITRD */
 784
 785 static int __init early_init_dt_scan_chosen(unsigned long node,
 786                                             const char *uname, int depth, void *data)
 787 {
 788         unsigned long *lprop;
 789         unsigned long l;
 790         char *p;
 791
 792         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 793
 794         if (depth != 1 ||
 795             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 796                 return 0;
 797
 798 #ifdef CONFIG_PPC64
 799         /* check if iommu is forced on or off */
 800         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 801                 iommu_is_off = 1;
 802         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 803                 iommu_force_on = 1;
 804 #endif
 805
 806         /* mem=x on the command line is the preferred mechanism */
 807         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 808         if (lprop)
 809                 memory_limit = *lprop;
 810
 811 #ifdef CONFIG_PPC64
 812         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 813         if (lprop)
 814                 tce_alloc_start = *lprop;
 815         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 816         if (lprop)
 817                 tce_alloc_end = *lprop;
 818 #endif
 819
 820 #ifdef CONFIG_KEXEC
 821         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 822         if (lprop)
 823                 crashk_res.start = *lprop;
 824
 825         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 826         if (lprop)
 827                 crashk_res.end = crashk_res.start + *lprop - 1;
 828 #endif
 829
 830         early_init_dt_check_for_initrd(node);
 831
 832         /* Retreive command line */
 833         p = of_get_flat_dt_prop(node, "bootargs", &l);
 834         if (p != NULL && l > 0)
 835                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
 836
 837 #ifdef CONFIG_CMDLINE
 838         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 839                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 840 #endif /* CONFIG_CMDLINE */
 841
 842         DBG("Command line is: %s\n", cmd_line);
 843
 844         /* break now */
 845         return 1;
 846 }
 847
 848 static int __init early_init_dt_scan_root(unsigned long node,
 849                                           const char *uname, int depth, void *data)
 850 {
 851         u32 *prop;
 852
 853         if (depth != 0)
 854                 return 0;
 855
 856         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
 857         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
 858         DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
 859
 860         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
 861         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
 862         DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
 863
 864         /* break now */
 865         return 1;
 866 }
 867
 868 <<<<<<< HEAD:arch/powerpc/kernel/prom.c
 869 static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
 870 =======
 871 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
 872 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/powerpc/kernel/prom.c
 873 {
 874         cell_t *p = *cellp;
 875
 876         *cellp = p + s;
 877 <<<<<<< HEAD:arch/powerpc/kernel/prom.c
 878         return of_read_ulong(p, s);
 879 =======
 880         return of_read_number(p, s);
 881 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/powerpc/kernel/prom.c
 882 }
 883
 884 #ifdef CONFIG_PPC_PSERIES
 885 /*
 886  * Interpret the ibm,dynamic-memory property in the
 887  * /ibm,dynamic-reconfiguration-memory node.
 888  * This contains a list of memory blocks along with NUMA affinity
 889  * information.
 890  */
 891 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 892 {
 893         cell_t *dm, *ls;
 894 <<<<<<< HEAD:arch/powerpc/kernel/prom.c
 895         unsigned long l, n;
 896         unsigned long base, size, lmb_size, flags;
 897 =======
 898         unsigned long l, n, flags;
 899         u64 base, size, lmb_size;
 900 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/powerpc/kernel/prom.c
 901
 902         ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 903         if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
 904                 return 0;
 905         lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 906
 907         dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 908         if (dm == NULL || l < sizeof(cell_t))
 909                 return 0;
 910
 911         n = *dm++;      /* number of entries */
 912         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
 913                 return 0;
 914
 915         for (; n != 0; --n) {
 916                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 917                 flags = dm[3];
 918                 /* skip DRC index, pad, assoc. list index, flags */
 919                 dm += 4;
 920                 /* skip this block if the reserved bit is set in flags (0x80)
 921                    or if the block is not assigned to this partition (0x8) */
 922                 if ((flags & 0x80) || !(flags & 0x8))
 923                         continue;
 924                 size = lmb_size;
 925                 if (iommu_is_off) {
 926                         if (base >= 0x80000000ul)
 927                                 continue;
 928                         if ((base + size) > 0x80000000ul)
 929                                 size = 0x80000000ul - base;
 930                 }
 931                 lmb_add(base, size);
 932         }
 933         lmb_dump_all();
 934         return 0;
 935 }
 936 #else
 937 #define early_init_dt_scan_drconf_memory(node)  0
 938 #endif /* CONFIG_PPC_PSERIES */
 939
 940 static int __init early_init_dt_scan_memory(unsigned long node,
 941                                             const char *uname, int depth, void *data)
 942 {
 943         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 944         cell_t *reg, *endp;
 945         unsigned long l;
 946
 947         /* Look for the ibm,dynamic-reconfiguration-memory node */
 948         if (depth == 1 &&
 949             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 950                 return early_init_dt_scan_drconf_memory(node);
 951
 952         /* We are scanning "memory" nodes only */
 953         if (type == NULL) {
 954                 /*
 955                  * The longtrail doesn't have a device_type on the
 956                  * /memory node, so look for the node called /memory@0.
 957                  */
 958                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
 959                         return 0;
 960         } else if (strcmp(type, "memory") != 0)
 961                 return 0;
 962
 963         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
 964         if (reg == NULL)
 965                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
 966         if (reg == NULL)
 967                 return 0;
 968
 969         endp = reg + (l / sizeof(cell_t));
 970
 971         DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
 972             uname, l, reg[0], reg[1], reg[2], reg[3]);
 973
 974         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
 975 <<<<<<< HEAD:arch/powerpc/kernel/prom.c
 976                 unsigned long base, size;
 977 =======
 978                 u64 base, size;
 979 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/powerpc/kernel/prom.c
 980
 981                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
 982                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
 983
 984                 if (size == 0)
 985                         continue;
 986 <<<<<<< HEAD:arch/powerpc/kernel/prom.c
 987                 DBG(" - %lx ,  %lx\n", base, size);
 988 =======
 989                 DBG(" - %llx ,  %llx\n", (unsigned long long)base,
 990                     (unsigned long long)size);
 991 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/powerpc/kernel/prom.c
 992 #ifdef CONFIG_PPC64
 993                 if (iommu_is_off) {
 994                         if (base >= 0x80000000ul)
 995                                 continue;
 996                         if ((base + size) > 0x80000000ul)
 997                                 size = 0x80000000ul - base;
 998                 }
 999 #endif
1000                 lmb_add(base, size);
1001         }
1002         return 0;
1003 }
1004
1005 static void __init early_reserve_mem(void)
1006 {
1007         u64 base, size;
1008         u64 *reserve_map;
1009         unsigned long self_base;
1010         unsigned long self_size;
1011
1012         reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
1013                                         initial_boot_params->off_mem_rsvmap);
1014
1015         /* before we do anything, lets reserve the dt blob */
1016         self_base = __pa((unsigned long)initial_boot_params);
1017         self_size = initial_boot_params->totalsize;
1018         lmb_reserve(self_base, self_size);
1019
1020 #ifdef CONFIG_BLK_DEV_INITRD
1021         /* then reserve the initrd, if any */
1022         if (initrd_start && (initrd_end > initrd_start))
1023                 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
1024 #endif /* CONFIG_BLK_DEV_INITRD */
1025
1026 #ifdef CONFIG_PPC32
1027         /*
1028          * Handle the case where we might be booting from an old kexec
1029          * image that setup the mem_rsvmap as pairs of 32-bit values
1030          */
1031         if (*reserve_map > 0xffffffffull) {
1032                 u32 base_32, size_32;
1033                 u32 *reserve_map_32 = (u32 *)reserve_map;
1034
1035                 while (1) {
1036                         base_32 = *(reserve_map_32++);
1037                         size_32 = *(reserve_map_32++);
1038                         if (size_32 == 0)
1039                                 break;
1040                         /* skip if the reservation is for the blob */
1041                         if (base_32 == self_base && size_32 == self_size)
1042                                 continue;
1043                         DBG("reserving: %x -> %x\n", base_32, size_32);
1044                         lmb_reserve(base_32, size_32);
1045                 }
1046                 return;
1047         }
1048 #endif
1049         while (1) {
1050                 base = *(reserve_map++);
1051                 size = *(reserve_map++);
1052                 if (size == 0)
1053                         break;
1054                 DBG("reserving: %llx -> %llx\n", base, size);
1055                 lmb_reserve(base, size);
1056         }
1057
1058 #if 0
1059         DBG("memory reserved, lmbs :\n");
1060         lmb_dump_all();
1061 #endif
1062 }
1063
1064 void __init early_init_devtree(void *params)
1065 {
1066         DBG(" -> early_init_devtree(%p)\n", params);
1067
1068         /* Setup flat device-tree pointer */
1069         initial_boot_params = params;
1070
1071 #ifdef CONFIG_PPC_RTAS
1072         /* Some machines might need RTAS info for debugging, grab it now. */
1073         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1074 #endif
1075
1076         /* Retrieve various informations from the /chosen node of the
1077          * device-tree, including the platform type, initrd location and
1078          * size, TCE reserve, and more ...
1079          */
1080         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1081
1082         /* Scan memory nodes and rebuild LMBs */
1083         lmb_init();
1084         of_scan_flat_dt(early_init_dt_scan_root, NULL);
1085         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1086
1087         /* Save command line for /proc/cmdline and then parse parameters */
1088         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1089         parse_early_param();
1090
1091         /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1092         lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1093         reserve_kdump_trampoline();
1094         reserve_crashkernel();
1095         early_reserve_mem();
1096
1097         lmb_enforce_memory_limit(memory_limit);
1098         lmb_analyze();
1099
1100         DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1101
1102         /* We may need to relocate the flat tree, do it now.
1103          * FIXME .. and the initrd too? */
1104         move_device_tree();
1105
1106         DBG("Scanning CPUs ...\n");
1107
1108         /* Retreive CPU related informations from the flat tree
1109          * (altivec support, boot CPU ID, ...)
1110          */
1111         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1112
1113         DBG(" <- early_init_devtree()\n");
1114 }
1115
1116
1117 /**
1118  * Indicates whether the root node has a given value in its
1119  * compatible property.
1120  */
1121 int machine_is_compatible(const char *compat)
1122 {
1123         struct device_node *root;
1124         int rc = 0;
1125
1126         root = of_find_node_by_path("/");
1127         if (root) {
1128                 rc = of_device_is_compatible(root, compat);
1129                 of_node_put(root);
1130         }
1131         return rc;
1132 }
1133 EXPORT_SYMBOL(machine_is_compatible);
1134
1135 /*******
1136  *
1137  * New implementation of the OF "find" APIs, return a refcounted
1138  * object, call of_node_put() when done.  The device tree and list
1139  * are protected by a rw_lock.
1140  *
1141  * Note that property management will need some locking as well,
1142  * this isn't dealt with yet.
1143  *
1144  *******/
1145
1146 /**
1147  *      of_find_node_by_phandle - Find a node given a phandle
1148  *      @handle:        phandle of the node to find
1149  *
1150  *      Returns a node pointer with refcount incremented, use
1151  *      of_node_put() on it when done.
1152  */
1153 struct device_node *of_find_node_by_phandle(phandle handle)
1154 {
1155         struct device_node *np;
1156
1157         read_lock(&devtree_lock);
1158         for (np = allnodes; np != 0; np = np->allnext)
1159                 if (np->linux_phandle == handle)
1160                         break;
1161         of_node_get(np);
1162         read_unlock(&devtree_lock);
1163         return np;
1164 }
1165 EXPORT_SYMBOL(of_find_node_by_phandle);
1166
1167 /**
1168  *      of_find_all_nodes - Get next node in global list
1169  *      @prev:  Previous node or NULL to start iteration
1170  *              of_node_put() will be called on it
1171  *
1172  *      Returns a node pointer with refcount incremented, use
1173  *      of_node_put() on it when done.
1174  */
1175 struct device_node *of_find_all_nodes(struct device_node *prev)
1176 {
1177         struct device_node *np;
1178
1179         read_lock(&devtree_lock);
1180         np = prev ? prev->allnext : allnodes;
1181         for (; np != 0; np = np->allnext)
1182                 if (of_node_get(np))
1183                         break;
1184         of_node_put(prev);
1185         read_unlock(&devtree_lock);
1186         return np;
1187 }
1188 EXPORT_SYMBOL(of_find_all_nodes);
1189
1190 /**
1191  *      of_node_get - Increment refcount of a node
1192  *      @node:  Node to inc refcount, NULL is supported to
1193  *              simplify writing of callers
1194  *
1195  *      Returns node.
1196  */
1197 struct device_node *of_node_get(struct device_node *node)
1198 {
1199         if (node)
1200                 kref_get(&node->kref);
1201         return node;
1202 }
1203 EXPORT_SYMBOL(of_node_get);
1204
1205 static inline struct device_node * kref_to_device_node(struct kref *kref)
1206 {
1207         return container_of(kref, struct device_node, kref);
1208 }
1209
1210 /**
1211  *      of_node_release - release a dynamically allocated node
1212  *      @kref:  kref element of the node to be released
1213  *
1214  *      In of_node_put() this function is passed to kref_put()
1215  *      as the destructor.
1216  */
1217 static void of_node_release(struct kref *kref)
1218 {
1219         struct device_node *node = kref_to_device_node(kref);
1220         struct property *prop = node->properties;
1221
1222         /* We should never be releasing nodes that haven't been detached. */
1223         if (!of_node_check_flag(node, OF_DETACHED)) {
1224                 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1225                 dump_stack();
1226                 kref_init(&node->kref);
1227                 return;
1228         }
1229
1230         if (!of_node_check_flag(node, OF_DYNAMIC))
1231                 return;
1232
1233         while (prop) {
1234                 struct property *next = prop->next;
1235                 kfree(prop->name);
1236                 kfree(prop->value);
1237                 kfree(prop);
1238                 prop = next;
1239
1240                 if (!prop) {
1241                         prop = node->deadprops;
1242                         node->deadprops = NULL;
1243                 }
1244         }
1245         kfree(node->full_name);
1246         kfree(node->data);
1247         kfree(node);
1248 }
1249
1250 /**
1251  *      of_node_put - Decrement refcount of a node
1252  *      @node:  Node to dec refcount, NULL is supported to
1253  *              simplify writing of callers
1254  *
1255  */
1256 void of_node_put(struct device_node *node)
1257 {
1258         if (node)
1259                 kref_put(&node->kref, of_node_release);
1260 }
1261 EXPORT_SYMBOL(of_node_put);
1262
1263 /*
1264  * Plug a device node into the tree and global list.
1265  */
1266 void of_attach_node(struct device_node *np)
1267 {
1268         write_lock(&devtree_lock);
1269         np->sibling = np->parent->child;
1270         np->allnext = allnodes;
1271         np->parent->child = np;
1272         allnodes = np;
1273         write_unlock(&devtree_lock);
1274 }
1275
1276 /*
1277  * "Unplug" a node from the device tree.  The caller must hold
1278  * a reference to the node.  The memory associated with the node
1279  * is not freed until its refcount goes to zero.
1280  */
1281 void of_detach_node(struct device_node *np)
1282 {
1283         struct device_node *parent;
1284
1285         write_lock(&devtree_lock);
1286
1287         parent = np->parent;
1288         if (!parent)
1289                 goto out_unlock;
1290
1291         if (allnodes == np)
1292                 allnodes = np->allnext;
1293         else {
1294                 struct device_node *prev;
1295                 for (prev = allnodes;
1296                      prev->allnext != np;
1297                      prev = prev->allnext)
1298                         ;
1299                 prev->allnext = np->allnext;
1300         }
1301
1302         if (parent->child == np)
1303                 parent->child = np->sibling;
1304         else {
1305                 struct device_node *prevsib;
1306                 for (prevsib = np->parent->child;
1307                      prevsib->sibling != np;
1308                      prevsib = prevsib->sibling)
1309                         ;
1310                 prevsib->sibling = np->sibling;
1311         }
1312
1313         of_node_set_flag(np, OF_DETACHED);
1314
1315 out_unlock:
1316         write_unlock(&devtree_lock);
1317 }
1318
1319 #ifdef CONFIG_PPC_PSERIES
1320 /*
1321  * Fix up the uninitialized fields in a new device node:
1322  * name, type and pci-specific fields
1323  */
1324
1325 static int of_finish_dynamic_node(struct device_node *node)
1326 {
1327         struct device_node *parent = of_get_parent(node);
1328         int err = 0;
1329         const phandle *ibm_phandle;
1330
1331         node->name = of_get_property(node, "name", NULL);
1332         node->type = of_get_property(node, "device_type", NULL);
1333
1334         if (!node->name)
1335                 node->name = "<NULL>";
1336         if (!node->type)
1337                 node->type = "<NULL>";
1338
1339         if (!parent) {
1340                 err = -ENODEV;
1341                 goto out;
1342         }
1343
1344         /* We don't support that function on PowerMac, at least
1345          * not yet
1346          */
1347         if (machine_is(powermac))
1348                 return -ENODEV;
1349
1350         /* fix up new node's linux_phandle field */
1351         if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1352                 node->linux_phandle = *ibm_phandle;
1353
1354 out:
1355         of_node_put(parent);
1356         return err;
1357 }
1358
1359 static int prom_reconfig_notifier(struct notifier_block *nb,
1360                                   unsigned long action, void *node)
1361 {
1362         int err;
1363
1364         switch (action) {
1365         case PSERIES_RECONFIG_ADD:
1366                 err = of_finish_dynamic_node(node);
1367                 if (err < 0) {
1368                         printk(KERN_ERR "finish_node returned %d\n", err);
1369                         err = NOTIFY_BAD;
1370                 }
1371                 break;
1372         default:
1373                 err = NOTIFY_DONE;
1374                 break;
1375         }
1376         return err;
1377 }
1378
1379 static struct notifier_block prom_reconfig_nb = {
1380         .notifier_call = prom_reconfig_notifier,
1381         .priority = 10, /* This one needs to run first */
1382 };
1383
1384 static int __init prom_reconfig_setup(void)
1385 {
1386         return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1387 }
1388 __initcall(prom_reconfig_setup);
1389 #endif
1390
1391 /*
1392  * Add a property to a node
1393  */
1394 int prom_add_property(struct device_node* np, struct property* prop)
1395 {
1396         struct property **next;
1397
1398         prop->next = NULL;
1399         write_lock(&devtree_lock);
1400         next = &np->properties;
1401         while (*next) {
1402                 if (strcmp(prop->name, (*next)->name) == 0) {
1403                         /* duplicate ! don't insert it */
1404                         write_unlock(&devtree_lock);
1405                         return -1;
1406                 }
1407                 next = &(*next)->next;
1408         }
1409         *next = prop;
1410         write_unlock(&devtree_lock);
1411
1412 #ifdef CONFIG_PROC_DEVICETREE
1413         /* try to add to proc as well if it was initialized */
1414         if (np->pde)
1415                 proc_device_tree_add_prop(np->pde, prop);
1416 #endif /* CONFIG_PROC_DEVICETREE */
1417
1418         return 0;
1419 }
1420
1421 /*
1422  * Remove a property from a node.  Note that we don't actually
1423  * remove it, since we have given out who-knows-how-many pointers
1424  * to the data using get-property.  Instead we just move the property
1425  * to the "dead properties" list, so it won't be found any more.
1426  */
1427 int prom_remove_property(struct device_node *np, struct property *prop)
1428 {
1429         struct property **next;
1430         int found = 0;
1431
1432         write_lock(&devtree_lock);
1433         next = &np->properties;
1434         while (*next) {
1435                 if (*next == prop) {
1436                         /* found the node */
1437                         *next = prop->next;
1438                         prop->next = np->deadprops;
1439                         np->deadprops = prop;
1440                         found = 1;
1441                         break;
1442                 }
1443                 next = &(*next)->next;
1444         }
1445         write_unlock(&devtree_lock);
1446
1447         if (!found)
1448                 return -ENODEV;
1449
1450 #ifdef CONFIG_PROC_DEVICETREE
1451         /* try to remove the proc node as well */
1452         if (np->pde)
1453                 proc_device_tree_remove_prop(np->pde, prop);
1454 #endif /* CONFIG_PROC_DEVICETREE */
1455
1456         return 0;
1457 }
1458
1459 /*
1460  * Update a property in a node.  Note that we don't actually
1461  * remove it, since we have given out who-knows-how-many pointers
1462  * to the data using get-property.  Instead we just move the property
1463  * to the "dead properties" list, and add the new property to the
1464  * property list
1465  */
1466 int prom_update_property(struct device_node *np,
1467                          struct property *newprop,
1468                          struct property *oldprop)
1469 {
1470         struct property **next;
1471         int found = 0;
1472
1473         write_lock(&devtree_lock);
1474         next = &np->properties;
1475         while (*next) {
1476                 if (*next == oldprop) {
1477                         /* found the node */
1478                         newprop->next = oldprop->next;
1479                         *next = newprop;
1480                         oldprop->next = np->deadprops;
1481                         np->deadprops = oldprop;
1482                         found = 1;
1483                         break;
1484                 }
1485                 next = &(*next)->next;
1486         }
1487         write_unlock(&devtree_lock);
1488
1489         if (!found)
1490                 return -ENODEV;
1491
1492 #ifdef CONFIG_PROC_DEVICETREE
1493         /* try to add to proc as well if it was initialized */
1494         if (np->pde)
1495                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1496 #endif /* CONFIG_PROC_DEVICETREE */
1497
1498         return 0;
1499 }
1500
1501
1502 /* Find the device node for a given logical cpu number, also returns the cpu
1503  * local thread number (index in ibm,interrupt-server#s) if relevant and
1504  * asked for (non NULL)
1505  */
1506 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1507 {
1508         int hardid;
1509         struct device_node *np;
1510
1511         hardid = get_hard_smp_processor_id(cpu);
1512
1513         for_each_node_by_type(np, "cpu") {
1514                 const u32 *intserv;
1515                 unsigned int plen, t;
1516
1517                 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1518                  * fallback to "reg" property and assume no threads
1519                  */
1520                 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1521                                 &plen);
1522                 if (intserv == NULL) {
1523                         const u32 *reg = of_get_property(np, "reg", NULL);
1524                         if (reg == NULL)
1525                                 continue;
1526                         if (*reg == hardid) {
1527                                 if (thread)
1528                                         *thread = 0;
1529                                 return np;
1530                         }
1531                 } else {
1532                         plen /= sizeof(u32);
1533                         for (t = 0; t < plen; t++) {
1534                                 if (hardid == intserv[t]) {
1535                                         if (thread)
1536                                                 *thread = t;
1537                                         return np;
1538                                 }
1539                         }
1540                 }
1541         }
1542         return NULL;
1543 }
1544 EXPORT_SYMBOL(of_get_cpu_node);
1545
1546 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1547 static struct debugfs_blob_wrapper flat_dt_blob;
1548
1549 static int __init export_flat_device_tree(void)
1550 {
1551         struct dentry *d;
1552
1553         flat_dt_blob.data = initial_boot_params;
1554         flat_dt_blob.size = initial_boot_params->totalsize;
1555
1556         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1557                                 powerpc_debugfs_root, &flat_dt_blob);
1558         if (!d)
1559                 return 1;
1560
1561         return 0;
1562 }
1563 __initcall(export_flat_device_tree);
1564 #endif