SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/microblaze/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 #include <stdarg.h>
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19 #include <linux/init.h>
  20 #include <linux/threads.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/stringify.h>
  25 #include <linux/delay.h>
  26 #include <linux/initrd.h>
  27 #include <linux/bitops.h>
  28 #include <linux/module.h>
  29 #include <linux/kexec.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/irq.h>
  32 #include <linux/lmb.h>
  33
  34 #include <asm/prom.h>
  35 #include <asm/page.h>
  36 #include <asm/processor.h>
  37 #include <asm/irq.h>
  38 #include <linux/io.h>
  39 #include <asm/system.h>
  40 #include <asm/mmu.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/sections.h>
  43 #include <asm/pci-bridge.h>
  44
  45 static int __initdata dt_root_addr_cells;
  46 static int __initdata dt_root_size_cells;
  47
  48 typedef u32 cell_t;
  49
  50 static struct boot_param_header *initial_boot_params;
  51
  52 /* export that to outside world */
  53 struct device_node *of_chosen;
  54
  55 static inline char *find_flat_dt_string(u32 offset)
  56 {
  57         return ((char *)initial_boot_params) +
  58                 initial_boot_params->off_dt_strings + offset;
  59 }
  60
  61 /**
  62  * This function is used to scan the flattened device-tree, it is
  63  * used to extract the memory informations at boot before we can
  64  * unflatten the tree
  65  */
  66 int __init of_scan_flat_dt(int (*it)(unsigned long node,
  67                                      const char *uname, int depth,
  68                                      void *data),
  69                            void *data)
  70 {
  71         unsigned long p = ((unsigned long)initial_boot_params) +
  72                 initial_boot_params->off_dt_struct;
  73         int rc = 0;
  74         int depth = -1;
  75
  76         do {
  77                 u32 tag = *((u32 *)p);
  78                 char *pathp;
  79
  80                 p += 4;
  81                 if (tag == OF_DT_END_NODE) {
  82                         depth--;
  83                         continue;
  84                 }
  85                 if (tag == OF_DT_NOP)
  86                         continue;
  87                 if (tag == OF_DT_END)
  88                         break;
  89                 if (tag == OF_DT_PROP) {
  90                         u32 sz = *((u32 *)p);
  91                         p += 8;
  92                         if (initial_boot_params->version < 0x10)
  93                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
  94                         p += sz;
  95                         p = _ALIGN(p, 4);
  96                         continue;
  97                 }
  98                 if (tag != OF_DT_BEGIN_NODE) {
  99                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
 100                                 " device tree !\n", tag);
 101                         return -EINVAL;
 102                 }
 103                 depth++;
 104                 pathp = (char *)p;
 105                 p = _ALIGN(p + strlen(pathp) + 1, 4);
 106                 if ((*pathp) == '/') {
 107                         char *lp, *np;
 108                         for (lp = NULL, np = pathp; *np; np++)
 109                                 if ((*np) == '/')
 110                                         lp = np+1;
 111                         if (lp != NULL)
 112                                 pathp = lp;
 113                 }
 114                 rc = it(p, pathp, depth, data);
 115                 if (rc != 0)
 116                         break;
 117         } while (1);
 118
 119         return rc;
 120 }
 121
 122 unsigned long __init of_get_flat_dt_root(void)
 123 {
 124         unsigned long p = ((unsigned long)initial_boot_params) +
 125                 initial_boot_params->off_dt_struct;
 126
 127         while (*((u32 *)p) == OF_DT_NOP)
 128                 p += 4;
 129         BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
 130         p += 4;
 131         return _ALIGN(p + strlen((char *)p) + 1, 4);
 132 }
 133
 134 /**
 135  * This function can be used within scan_flattened_dt callback to get
 136  * access to properties
 137  */
 138 void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
 139                                 unsigned long *size)
 140 {
 141         unsigned long p = node;
 142
 143         do {
 144                 u32 tag = *((u32 *)p);
 145                 u32 sz, noff;
 146                 const char *nstr;
 147
 148                 p += 4;
 149                 if (tag == OF_DT_NOP)
 150                         continue;
 151                 if (tag != OF_DT_PROP)
 152                         return NULL;
 153
 154                 sz = *((u32 *)p);
 155                 noff = *((u32 *)(p + 4));
 156                 p += 8;
 157                 if (initial_boot_params->version < 0x10)
 158                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
 159
 160                 nstr = find_flat_dt_string(noff);
 161                 if (nstr == NULL) {
 162                         printk(KERN_WARNING "Can't find property index"
 163                                 " name !\n");
 164                         return NULL;
 165                 }
 166                 if (strcmp(name, nstr) == 0) {
 167                         if (size)
 168                                 *size = sz;
 169                         return (void *)p;
 170                 }
 171                 p += sz;
 172                 p = _ALIGN(p, 4);
 173         } while (1);
 174 }
 175
 176 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
 177 {
 178         const char *cp;
 179         unsigned long cplen, l;
 180
 181         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
 182         if (cp == NULL)
 183                 return 0;
 184         while (cplen > 0) {
 185                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
 186                         return 1;
 187                 l = strlen(cp) + 1;
 188                 cp += l;
 189                 cplen -= l;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
 196                                         unsigned long align)
 197 {
 198         void *res;
 199
 200         *mem = _ALIGN(*mem, align);
 201         res = (void *)*mem;
 202         *mem += size;
 203
 204         return res;
 205 }
 206
 207 static unsigned long __init unflatten_dt_node(unsigned long mem,
 208                                         unsigned long *p,
 209                                         struct device_node *dad,
 210                                         struct device_node ***allnextpp,
 211                                         unsigned long fpsize)
 212 {
 213         struct device_node *np;
 214         struct property *pp, **prev_pp = NULL;
 215         char *pathp;
 216         u32 tag;
 217         unsigned int l, allocl;
 218         int has_name = 0;
 219         int new_format = 0;
 220
 221         tag = *((u32 *)(*p));
 222         if (tag != OF_DT_BEGIN_NODE) {
 223                 printk("Weird tag at start of node: %x\n", tag);
 224                 return mem;
 225         }
 226         *p += 4;
 227         pathp = (char *)*p;
 228         l = allocl = strlen(pathp) + 1;
 229         *p = _ALIGN(*p + l, 4);
 230
 231         /* version 0x10 has a more compact unit name here instead of the full
 232          * path. we accumulate the full path size using "fpsize", we'll rebuild
 233          * it later. We detect this because the first character of the name is
 234          * not '/'.
 235          */
 236         if ((*pathp) != '/') {
 237                 new_format = 1;
 238                 if (fpsize == 0) {
 239                         /* root node: special case. fpsize accounts for path
 240                          * plus terminating zero. root node only has '/', so
 241                          * fpsize should be 2, but we want to avoid the first
 242                          * level nodes to have two '/' so we use fpsize 1 here
 243                          */
 244                         fpsize = 1;
 245                         allocl = 2;
 246                 } else {
 247                         /* account for '/' and path size minus terminal 0
 248                          * already in 'l'
 249                          */
 250                         fpsize += l;
 251                         allocl = fpsize;
 252                 }
 253         }
 254
 255         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
 256                                 __alignof__(struct device_node));
 257         if (allnextpp) {
 258                 memset(np, 0, sizeof(*np));
 259                 np->full_name = ((char *)np) + sizeof(struct device_node);
 260                 if (new_format) {
 261                         char *p2 = np->full_name;
 262                         /* rebuild full path for new format */
 263                         if (dad && dad->parent) {
 264                                 strcpy(p2, dad->full_name);
 265 #ifdef DEBUG
 266                                 if ((strlen(p2) + l + 1) != allocl) {
 267                                         pr_debug("%s: p: %d, l: %d, a: %d\n",
 268                                                 pathp, (int)strlen(p2),
 269                                                 l, allocl);
 270                                 }
 271 #endif
 272                                 p2 += strlen(p2);
 273                         }
 274                         *(p2++) = '/';
 275                         memcpy(p2, pathp, l);
 276                 } else
 277                         memcpy(np->full_name, pathp, l);
 278                 prev_pp = &np->properties;
 279                 **allnextpp = np;
 280                 *allnextpp = &np->allnext;
 281                 if (dad != NULL) {
 282                         np->parent = dad;
 283                         /* we temporarily use the next field as `last_child'*/
 284                         if (dad->next == NULL)
 285                                 dad->child = np;
 286                         else
 287                                 dad->next->sibling = np;
 288                         dad->next = np;
 289                 }
 290                 kref_init(&np->kref);
 291         }
 292         while (1) {
 293                 u32 sz, noff;
 294                 char *pname;
 295
 296                 tag = *((u32 *)(*p));
 297                 if (tag == OF_DT_NOP) {
 298                         *p += 4;
 299                         continue;
 300                 }
 301                 if (tag != OF_DT_PROP)
 302                         break;
 303                 *p += 4;
 304                 sz = *((u32 *)(*p));
 305                 noff = *((u32 *)((*p) + 4));
 306                 *p += 8;
 307                 if (initial_boot_params->version < 0x10)
 308                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
 309
 310                 pname = find_flat_dt_string(noff);
 311                 if (pname == NULL) {
 312                         printk(KERN_INFO
 313                                 "Can't find property name in list !\n");
 314                         break;
 315                 }
 316                 if (strcmp(pname, "name") == 0)
 317                         has_name = 1;
 318                 l = strlen(pname) + 1;
 319                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
 320                                         __alignof__(struct property));
 321                 if (allnextpp) {
 322                         if (strcmp(pname, "linux,phandle") == 0) {
 323                                 np->node = *((u32 *)*p);
 324                                 if (np->linux_phandle == 0)
 325                                         np->linux_phandle = np->node;
 326                         }
 327                         if (strcmp(pname, "ibm,phandle") == 0)
 328                                 np->linux_phandle = *((u32 *)*p);
 329                         pp->name = pname;
 330                         pp->length = sz;
 331                         pp->value = (void *)*p;
 332                         *prev_pp = pp;
 333                         prev_pp = &pp->next;
 334                 }
 335                 *p = _ALIGN((*p) + sz, 4);
 336         }
 337         /* with version 0x10 we may not have the name property, recreate
 338          * it here from the unit name if absent
 339          */
 340         if (!has_name) {
 341                 char *p1 = pathp, *ps = pathp, *pa = NULL;
 342                 int sz;
 343
 344                 while (*p1) {
 345                         if ((*p1) == '@')
 346                                 pa = p1;
 347                         if ((*p1) == '/')
 348                                 ps = p1 + 1;
 349                         p1++;
 350                 }
 351                 if (pa < ps)
 352                         pa = p1;
 353                 sz = (pa - ps) + 1;
 354                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
 355                                         __alignof__(struct property));
 356                 if (allnextpp) {
 357                         pp->name = "name";
 358                         pp->length = sz;
 359                         pp->value = pp + 1;
 360                         *prev_pp = pp;
 361                         prev_pp = &pp->next;
 362                         memcpy(pp->value, ps, sz - 1);
 363                         ((char *)pp->value)[sz - 1] = 0;
 364                         pr_debug("fixed up name for %s -> %s\n", pathp,
 365                                 (char *)pp->value);
 366                 }
 367         }
 368         if (allnextpp) {
 369                 *prev_pp = NULL;
 370                 np->name = of_get_property(np, "name", NULL);
 371                 np->type = of_get_property(np, "device_type", NULL);
 372
 373                 if (!np->name)
 374                         np->name = "<NULL>";
 375                 if (!np->type)
 376                         np->type = "<NULL>";
 377         }
 378         while (tag == OF_DT_BEGIN_NODE) {
 379                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
 380                 tag = *((u32 *)(*p));
 381         }
 382         if (tag != OF_DT_END_NODE) {
 383                 printk(KERN_INFO "Weird tag at end of node: %x\n", tag);
 384                 return mem;
 385         }
 386         *p += 4;
 387         return mem;
 388 }
 389
 390 /**
 391  * unflattens the device-tree passed by the firmware, creating the
 392  * tree of struct device_node. It also fills the "name" and "type"
 393  * pointers of the nodes so the normal device-tree walking functions
 394  * can be used (this used to be done by finish_device_tree)
 395  */
 396 void __init unflatten_device_tree(void)
 397 {
 398         unsigned long start, mem, size;
 399         struct device_node **allnextp = &allnodes;
 400
 401         pr_debug(" -> unflatten_device_tree()\n");
 402
 403         /* First pass, scan for size */
 404         start = ((unsigned long)initial_boot_params) +
 405                 initial_boot_params->off_dt_struct;
 406         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
 407         size = (size | 3) + 1;
 408
 409         pr_debug("  size is %lx, allocating...\n", size);
 410
 411         /* Allocate memory for the expanded device tree */
 412         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
 413         mem = (unsigned long) __va(mem);
 414
 415         ((u32 *)mem)[size / 4] = 0xdeadbeef;
 416
 417         pr_debug("  unflattening %lx...\n", mem);
 418
 419         /* Second pass, do actual unflattening */
 420         start = ((unsigned long)initial_boot_params) +
 421                 initial_boot_params->off_dt_struct;
 422         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
 423         if (*((u32 *)start) != OF_DT_END)
 424                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n",
 425                         *((u32 *)start));
 426         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
 427                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
 428                         ((u32 *)mem)[size / 4]);
 429         *allnextp = NULL;
 430
 431         /* Get pointer to OF "/chosen" node for use everywhere */
 432         of_chosen = of_find_node_by_path("/chosen");
 433         if (of_chosen == NULL)
 434                 of_chosen = of_find_node_by_path("/chosen@0");
 435
 436         pr_debug(" <- unflatten_device_tree()\n");
 437 }
 438
 439 #define early_init_dt_scan_drconf_memory(node) 0
 440
 441 static int __init early_init_dt_scan_cpus(unsigned long node,
 442                                           const char *uname, int depth,
 443                                           void *data)
 444 {
 445         static int logical_cpuid;
 446         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 447         const u32 *intserv;
 448         int i, nthreads;
 449         int found = 0;
 450
 451         /* We are scanning "cpu" nodes only */
 452         if (type == NULL || strcmp(type, "cpu") != 0)
 453                 return 0;
 454
 455         /* Get physical cpuid */
 456         intserv = of_get_flat_dt_prop(node, "reg", NULL);
 457         nthreads = 1;
 458
 459         /*
 460          * Now see if any of these threads match our boot cpu.
 461          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 462          */
 463         for (i = 0; i < nthreads; i++) {
 464                 /*
 465                  * version 2 of the kexec param format adds the phys cpuid of
 466                  * booted proc.
 467                  */
 468                 if (initial_boot_params && initial_boot_params->version >= 2) {
 469                         if (intserv[i] ==
 470                                         initial_boot_params->boot_cpuid_phys) {
 471                                 found = 1;
 472                                 break;
 473                         }
 474                 } else {
 475                         /*
 476                          * Check if it's the boot-cpu, set it's hw index now,
 477                          * unfortunately this format did not support booting
 478                          * off secondary threads.
 479                          */
 480                         if (of_get_flat_dt_prop(node,
 481                                         "linux,boot-cpu", NULL) != NULL) {
 482                                 found = 1;
 483                                 break;
 484                         }
 485                 }
 486
 487 #ifdef CONFIG_SMP
 488                 /* logical cpu id is always 0 on UP kernels */
 489                 logical_cpuid++;
 490 #endif
 491         }
 492
 493         if (found) {
 494                 pr_debug("boot cpu: logical %d physical %d\n", logical_cpuid,
 495                         intserv[i]);
 496                 boot_cpuid = logical_cpuid;
 497         }
 498
 499         return 0;
 500 }
 501
 502 #ifdef CONFIG_BLK_DEV_INITRD
 503 static void __init early_init_dt_check_for_initrd(unsigned long node)
 504 {
 505         unsigned long l;
 506         u32 *prop;
 507
 508         pr_debug("Looking for initrd properties... ");
 509
 510         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
 511         if (prop) {
 512                 initrd_start = (unsigned long)
 513                                         __va((u32)of_read_ulong(prop, l/4));
 514
 515                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
 516                 if (prop) {
 517                         initrd_end = (unsigned long)
 518                                         __va((u32)of_read_ulong(prop, 1/4));
 519                         initrd_below_start_ok = 1;
 520                 } else {
 521                         initrd_start = 0;
 522                 }
 523         }
 524
 525         pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n",
 526                                         initrd_start, initrd_end);
 527 }
 528 #else
 529 static inline void early_init_dt_check_for_initrd(unsigned long node)
 530 {
 531 }
 532 #endif /* CONFIG_BLK_DEV_INITRD */
 533
 534 static int __init early_init_dt_scan_chosen(unsigned long node,
 535                                 const char *uname, int depth, void *data)
 536 {
 537         unsigned long l;
 538         char *p;
 539
 540         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 541
 542         if (depth != 1 ||
 543                 (strcmp(uname, "chosen") != 0 &&
 544                                 strcmp(uname, "chosen@0") != 0))
 545                 return 0;
 546
 547 #ifdef CONFIG_KEXEC
 548         lprop = (u64 *)of_get_flat_dt_prop(node,
 549                                 "linux,crashkernel-base", NULL);
 550         if (lprop)
 551                 crashk_res.start = *lprop;
 552
 553         lprop = (u64 *)of_get_flat_dt_prop(node,
 554                                 "linux,crashkernel-size", NULL);
 555         if (lprop)
 556                 crashk_res.end = crashk_res.start + *lprop - 1;
 557 #endif
 558
 559         early_init_dt_check_for_initrd(node);
 560
 561         /* Retreive command line */
 562         p = of_get_flat_dt_prop(node, "bootargs", &l);
 563         if (p != NULL && l > 0)
 564                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
 565
 566 #ifdef CONFIG_CMDLINE
 567 #ifndef CONFIG_CMDLINE_FORCE
 568         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 569 #endif
 570                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 571 #endif /* CONFIG_CMDLINE */
 572
 573         pr_debug("Command line is: %s\n", cmd_line);
 574
 575         /* break now */
 576         return 1;
 577 }
 578
 579 static int __init early_init_dt_scan_root(unsigned long node,
 580                                 const char *uname, int depth, void *data)
 581 {
 582         u32 *prop;
 583
 584         if (depth != 0)
 585                 return 0;
 586
 587         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
 588         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
 589         pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
 590
 591         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
 592         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
 593         pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
 594
 595         /* break now */
 596         return 1;
 597 }
 598
 599 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
 600 {
 601         cell_t *p = *cellp;
 602
 603         *cellp = p + s;
 604         return of_read_number(p, s);
 605 }
 606
 607 static int __init early_init_dt_scan_memory(unsigned long node,
 608                                 const char *uname, int depth, void *data)
 609 {
 610         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 611         cell_t *reg, *endp;
 612         unsigned long l;
 613
 614         /* Look for the ibm,dynamic-reconfiguration-memory node */
 615 /*      if (depth == 1 &&
 616                 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 617                 return early_init_dt_scan_drconf_memory(node);
 618 */
 619         /* We are scanning "memory" nodes only */
 620         if (type == NULL) {
 621                 /*
 622                  * The longtrail doesn't have a device_type on the
 623                  * /memory node, so look for the node called /memory@0.
 624                  */
 625                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
 626                         return 0;
 627         } else if (strcmp(type, "memory") != 0)
 628                 return 0;
 629
 630         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
 631         if (reg == NULL)
 632                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
 633         if (reg == NULL)
 634                 return 0;
 635
 636         endp = reg + (l / sizeof(cell_t));
 637
 638         pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
 639                 uname, l, reg[0], reg[1], reg[2], reg[3]);
 640
 641         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
 642                 u64 base, size;
 643
 644                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
 645                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
 646
 647                 if (size == 0)
 648                         continue;
 649                 pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
 650                         (unsigned long long)size);
 651
 652                 lmb_add(base, size);
 653         }
 654         return 0;
 655 }
 656
 657 #ifdef CONFIG_PHYP_DUMP
 658 /**
 659  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
 660  *
 661  * Function to find the largest size we need to reserve
 662  * during early boot process.
 663  *
 664  * It either looks for boot param and returns that OR
 665  * returns larger of 256 or 5% rounded down to multiples of 256MB.
 666  *
 667  */
 668 static inline unsigned long phyp_dump_calculate_reserve_size(void)
 669 {
 670         unsigned long tmp;
 671
 672         if (phyp_dump_info->reserve_bootvar)
 673                 return phyp_dump_info->reserve_bootvar;
 674
 675         /* divide by 20 to get 5% of value */
 676         tmp = lmb_end_of_DRAM();
 677         do_div(tmp, 20);
 678
 679         /* round it down in multiples of 256 */
 680         tmp = tmp & ~0x0FFFFFFFUL;
 681
 682         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
 683 }
 684
 685 /**
 686  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
 687  *
 688  * This routine may reserve memory regions in the kernel only
 689  * if the system is supported and a dump was taken in last
 690  * boot instance or if the hardware is supported and the
 691  * scratch area needs to be setup. In other instances it returns
 692  * without reserving anything. The memory in case of dump being
 693  * active is freed when the dump is collected (by userland tools).
 694  */
 695 static void __init phyp_dump_reserve_mem(void)
 696 {
 697         unsigned long base, size;
 698         unsigned long variable_reserve_size;
 699
 700         if (!phyp_dump_info->phyp_dump_configured) {
 701                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
 702                 return;
 703         }
 704
 705         if (!phyp_dump_info->phyp_dump_at_boot) {
 706                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
 707                 return;
 708         }
 709
 710         variable_reserve_size = phyp_dump_calculate_reserve_size();
 711
 712         if (phyp_dump_info->phyp_dump_is_active) {
 713                 /* Reserve *everything* above RMR.Area freed by userland tools*/
 714                 base = variable_reserve_size;
 715                 size = lmb_end_of_DRAM() - base;
 716
 717                 /* XXX crashed_ram_end is wrong, since it may be beyond
 718                  * the memory_limit, it will need to be adjusted. */
 719                 lmb_reserve(base, size);
 720
 721                 phyp_dump_info->init_reserve_start = base;
 722                 phyp_dump_info->init_reserve_size = size;
 723         } else {
 724                 size = phyp_dump_info->cpu_state_size +
 725                         phyp_dump_info->hpte_region_size +
 726                         variable_reserve_size;
 727                 base = lmb_end_of_DRAM() - size;
 728                 lmb_reserve(base, size);
 729                 phyp_dump_info->init_reserve_start = base;
 730                 phyp_dump_info->init_reserve_size = size;
 731         }
 732 }
 733 #else
 734 static inline void __init phyp_dump_reserve_mem(void) {}
 735 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
 736
 737 #ifdef CONFIG_EARLY_PRINTK
 738 /* MS this is Microblaze specifig function */
 739 static int __init early_init_dt_scan_serial(unsigned long node,
 740                                 const char *uname, int depth, void *data)
 741 {
 742         unsigned long l;
 743         char *p;
 744         int *addr;
 745
 746         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 747
 748 /* find all serial nodes */
 749         if (strncmp(uname, "serial", 6) != 0)
 750                 return 0;
 751
 752         early_init_dt_check_for_initrd(node);
 753
 754 /* find compatible node with uartlite */
 755         p = of_get_flat_dt_prop(node, "compatible", &l);
 756         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
 757                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
 758                 return 0;
 759
 760         addr = of_get_flat_dt_prop(node, "reg", &l);
 761         return *addr; /* return address */
 762 }
 763
 764 /* this function is looking for early uartlite console - Microblaze specific */
 765 int __init early_uartlite_console(void)
 766 {
 767         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
 768 }
 769 #endif
 770
 771 void __init early_init_devtree(void *params)
 772 {
 773         pr_debug(" -> early_init_devtree(%p)\n", params);
 774
 775         /* Setup flat device-tree pointer */
 776         initial_boot_params = params;
 777
 778 #ifdef CONFIG_PHYP_DUMP
 779         /* scan tree to see if dump occured during last boot */
 780         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
 781 #endif
 782
 783         /* Retrieve various informations from the /chosen node of the
 784          * device-tree, including the platform type, initrd location and
 785          * size, TCE reserve, and more ...
 786          */
 787         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
 788
 789         /* Scan memory nodes and rebuild LMBs */
 790         lmb_init();
 791         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 792         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 793
 794         /* Save command line for /proc/cmdline and then parse parameters */
 795         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 796         parse_early_param();
 797
 798         lmb_analyze();
 799
 800         pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
 801
 802         pr_debug("Scanning CPUs ...\n");
 803
 804         /* Retreive CPU related informations from the flat tree
 805          * (altivec support, boot CPU ID, ...)
 806          */
 807         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 808
 809         pr_debug(" <- early_init_devtree()\n");
 810 }
 811
 812 /**
 813  * Indicates whether the root node has a given value in its
 814  * compatible property.
 815  */
 816 int machine_is_compatible(const char *compat)
 817 {
 818         struct device_node *root;
 819         int rc = 0;
 820
 821         root = of_find_node_by_path("/");
 822         if (root) {
 823                 rc = of_device_is_compatible(root, compat);
 824                 of_node_put(root);
 825         }
 826         return rc;
 827 }
 828 EXPORT_SYMBOL(machine_is_compatible);
 829
 830 /*******
 831  *
 832  * New implementation of the OF "find" APIs, return a refcounted
 833  * object, call of_node_put() when done.  The device tree and list
 834  * are protected by a rw_lock.
 835  *
 836  * Note that property management will need some locking as well,
 837  * this isn't dealt with yet.
 838  *
 839  *******/
 840
 841 /**
 842  *      of_find_node_by_phandle - Find a node given a phandle
 843  *      @handle:        phandle of the node to find
 844  *
 845  *      Returns a node pointer with refcount incremented, use
 846  *      of_node_put() on it when done.
 847  */
 848 struct device_node *of_find_node_by_phandle(phandle handle)
 849 {
 850         struct device_node *np;
 851
 852         read_lock(&devtree_lock);
 853         for (np = allnodes; np != NULL; np = np->allnext)
 854                 if (np->linux_phandle == handle)
 855                         break;
 856         of_node_get(np);
 857         read_unlock(&devtree_lock);
 858         return np;
 859 }
 860 EXPORT_SYMBOL(of_find_node_by_phandle);
 861
 862 /**
 863  *      of_node_get - Increment refcount of a node
 864  *      @node:  Node to inc refcount, NULL is supported to
 865  *              simplify writing of callers
 866  *
 867  *      Returns node.
 868  */
 869 struct device_node *of_node_get(struct device_node *node)
 870 {
 871         if (node)
 872                 kref_get(&node->kref);
 873         return node;
 874 }
 875 EXPORT_SYMBOL(of_node_get);
 876
 877 static inline struct device_node *kref_to_device_node(struct kref *kref)
 878 {
 879         return container_of(kref, struct device_node, kref);
 880 }
 881
 882 /**
 883  *      of_node_release - release a dynamically allocated node
 884  *      @kref:  kref element of the node to be released
 885  *
 886  *      In of_node_put() this function is passed to kref_put()
 887  *      as the destructor.
 888  */
 889 static void of_node_release(struct kref *kref)
 890 {
 891         struct device_node *node = kref_to_device_node(kref);
 892         struct property *prop = node->properties;
 893
 894         /* We should never be releasing nodes that haven't been detached. */
 895         if (!of_node_check_flag(node, OF_DETACHED)) {
 896                 printk(KERN_INFO "WARNING: Bad of_node_put() on %s\n",
 897                         node->full_name);
 898                 dump_stack();
 899                 kref_init(&node->kref);
 900                 return;
 901         }
 902
 903         if (!of_node_check_flag(node, OF_DYNAMIC))
 904                 return;
 905
 906         while (prop) {
 907                 struct property *next = prop->next;
 908                 kfree(prop->name);
 909                 kfree(prop->value);
 910                 kfree(prop);
 911                 prop = next;
 912
 913                 if (!prop) {
 914                         prop = node->deadprops;
 915                         node->deadprops = NULL;
 916                 }
 917         }
 918         kfree(node->full_name);
 919         kfree(node->data);
 920         kfree(node);
 921 }
 922
 923 /**
 924  *      of_node_put - Decrement refcount of a node
 925  *      @node:  Node to dec refcount, NULL is supported to
 926  *              simplify writing of callers
 927  *
 928  */
 929 void of_node_put(struct device_node *node)
 930 {
 931         if (node)
 932                 kref_put(&node->kref, of_node_release);
 933 }
 934 EXPORT_SYMBOL(of_node_put);
 935
 936 /*
 937  * Plug a device node into the tree and global list.
 938  */
 939 void of_attach_node(struct device_node *np)
 940 {
 941         unsigned long flags;
 942
 943         write_lock_irqsave(&devtree_lock, flags);
 944         np->sibling = np->parent->child;
 945         np->allnext = allnodes;
 946         np->parent->child = np;
 947         allnodes = np;
 948         write_unlock_irqrestore(&devtree_lock, flags);
 949 }
 950
 951 /*
 952  * "Unplug" a node from the device tree.  The caller must hold
 953  * a reference to the node.  The memory associated with the node
 954  * is not freed until its refcount goes to zero.
 955  */
 956 void of_detach_node(struct device_node *np)
 957 {
 958         struct device_node *parent;
 959         unsigned long flags;
 960
 961         write_lock_irqsave(&devtree_lock, flags);
 962
 963         parent = np->parent;
 964         if (!parent)
 965                 goto out_unlock;
 966
 967         if (allnodes == np)
 968                 allnodes = np->allnext;
 969         else {
 970                 struct device_node *prev;
 971                 for (prev = allnodes;
 972                      prev->allnext != np;
 973                      prev = prev->allnext)
 974                         ;
 975                 prev->allnext = np->allnext;
 976         }
 977
 978         if (parent->child == np)
 979                 parent->child = np->sibling;
 980         else {
 981                 struct device_node *prevsib;
 982                 for (prevsib = np->parent->child;
 983                      prevsib->sibling != np;
 984                      prevsib = prevsib->sibling)
 985                         ;
 986                 prevsib->sibling = np->sibling;
 987         }
 988
 989         of_node_set_flag(np, OF_DETACHED);
 990
 991 out_unlock:
 992         write_unlock_irqrestore(&devtree_lock, flags);
 993 }
 994
 995 /*
 996  * Add a property to a node
 997  */
 998 int prom_add_property(struct device_node *np, struct property *prop)
 999 {
1000         struct property **next;
1001         unsigned long flags;
1002
1003         prop->next = NULL;
1004         write_lock_irqsave(&devtree_lock, flags);
1005         next = &np->properties;
1006         while (*next) {
1007                 if (strcmp(prop->name, (*next)->name) == 0) {
1008                         /* duplicate ! don't insert it */
1009                         write_unlock_irqrestore(&devtree_lock, flags);
1010                         return -1;
1011                 }
1012                 next = &(*next)->next;
1013         }
1014         *next = prop;
1015         write_unlock_irqrestore(&devtree_lock, flags);
1016
1017 #ifdef CONFIG_PROC_DEVICETREE
1018         /* try to add to proc as well if it was initialized */
1019         if (np->pde)
1020                 proc_device_tree_add_prop(np->pde, prop);
1021 #endif /* CONFIG_PROC_DEVICETREE */
1022
1023         return 0;
1024 }
1025
1026 /*
1027  * Remove a property from a node.  Note that we don't actually
1028  * remove it, since we have given out who-knows-how-many pointers
1029  * to the data using get-property.  Instead we just move the property
1030  * to the "dead properties" list, so it won't be found any more.
1031  */
1032 int prom_remove_property(struct device_node *np, struct property *prop)
1033 {
1034         struct property **next;
1035         unsigned long flags;
1036         int found = 0;
1037
1038         write_lock_irqsave(&devtree_lock, flags);
1039         next = &np->properties;
1040         while (*next) {
1041                 if (*next == prop) {
1042                         /* found the node */
1043                         *next = prop->next;
1044                         prop->next = np->deadprops;
1045                         np->deadprops = prop;
1046                         found = 1;
1047                         break;
1048                 }
1049                 next = &(*next)->next;
1050         }
1051         write_unlock_irqrestore(&devtree_lock, flags);
1052
1053         if (!found)
1054                 return -ENODEV;
1055
1056 #ifdef CONFIG_PROC_DEVICETREE
1057         /* try to remove the proc node as well */
1058         if (np->pde)
1059                 proc_device_tree_remove_prop(np->pde, prop);
1060 #endif /* CONFIG_PROC_DEVICETREE */
1061
1062         return 0;
1063 }
1064
1065 /*
1066  * Update a property in a node.  Note that we don't actually
1067  * remove it, since we have given out who-knows-how-many pointers
1068  * to the data using get-property.  Instead we just move the property
1069  * to the "dead properties" list, and add the new property to the
1070  * property list
1071  */
1072 int prom_update_property(struct device_node *np,
1073                          struct property *newprop,
1074                          struct property *oldprop)
1075 {
1076         struct property **next;
1077         unsigned long flags;
1078         int found = 0;
1079
1080         write_lock_irqsave(&devtree_lock, flags);
1081         next = &np->properties;
1082         while (*next) {
1083                 if (*next == oldprop) {
1084                         /* found the node */
1085                         newprop->next = oldprop->next;
1086                         *next = newprop;
1087                         oldprop->next = np->deadprops;
1088                         np->deadprops = oldprop;
1089                         found = 1;
1090                         break;
1091                 }
1092                 next = &(*next)->next;
1093         }
1094         write_unlock_irqrestore(&devtree_lock, flags);
1095
1096         if (!found)
1097                 return -ENODEV;
1098
1099 #ifdef CONFIG_PROC_DEVICETREE
1100         /* try to add to proc as well if it was initialized */
1101         if (np->pde)
1102                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1103 #endif /* CONFIG_PROC_DEVICETREE */
1104
1105         return 0;
1106 }
1107
1108 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1109 static struct debugfs_blob_wrapper flat_dt_blob;
1110
1111 static int __init export_flat_device_tree(void)
1112 {
1113         struct dentry *d;
1114
1115         flat_dt_blob.data = initial_boot_params;
1116         flat_dt_blob.size = initial_boot_params->totalsize;
1117
1118         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1119                                 of_debugfs_root, &flat_dt_blob);
1120         if (!d)
1121                 return 1;
1122
1123         return 0;
1124 }
1125 device_initcall(export_flat_device_tree);
1126 #endif