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)__va(of_read_ulong(prop, l/4));
 513
 514                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
 515                 if (prop) {
 516                         initrd_end = (unsigned long)
 517                                         __va(of_read_ulong(prop, l/4));
 518                         initrd_below_start_ok = 1;
 519                 } else {
 520                         initrd_start = 0;
 521                 }
 522         }
 523
 524         pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n",
 525                                         initrd_start, initrd_end);
 526 }
 527 #else
 528 static inline void early_init_dt_check_for_initrd(unsigned long node)
 529 {
 530 }
 531 #endif /* CONFIG_BLK_DEV_INITRD */
 532
 533 static int __init early_init_dt_scan_chosen(unsigned long node,
 534                                 const char *uname, int depth, void *data)
 535 {
 536         unsigned long l;
 537         char *p;
 538
 539         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 540
 541         if (depth != 1 ||
 542                 (strcmp(uname, "chosen") != 0 &&
 543                                 strcmp(uname, "chosen@0") != 0))
 544                 return 0;
 545
 546 #ifdef CONFIG_KEXEC
 547         lprop = (u64 *)of_get_flat_dt_prop(node,
 548                                 "linux,crashkernel-base", NULL);
 549         if (lprop)
 550                 crashk_res.start = *lprop;
 551
 552         lprop = (u64 *)of_get_flat_dt_prop(node,
 553                                 "linux,crashkernel-size", NULL);
 554         if (lprop)
 555                 crashk_res.end = crashk_res.start + *lprop - 1;
 556 #endif
 557
 558         early_init_dt_check_for_initrd(node);
 559
 560         /* Retreive command line */
 561         p = of_get_flat_dt_prop(node, "bootargs", &l);
 562         if (p != NULL && l > 0)
 563                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
 564
 565 #ifdef CONFIG_CMDLINE
 566         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 567                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 568 #endif /* CONFIG_CMDLINE */
 569
 570         pr_debug("Command line is: %s\n", cmd_line);
 571
 572         /* break now */
 573         return 1;
 574 }
 575
 576 static int __init early_init_dt_scan_root(unsigned long node,
 577                                 const char *uname, int depth, void *data)
 578 {
 579         u32 *prop;
 580
 581         if (depth != 0)
 582                 return 0;
 583
 584         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
 585         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
 586         pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
 587
 588         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
 589         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
 590         pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
 591
 592         /* break now */
 593         return 1;
 594 }
 595
 596 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
 597 {
 598         cell_t *p = *cellp;
 599
 600         *cellp = p + s;
 601         return of_read_number(p, s);
 602 }
 603
 604 static int __init early_init_dt_scan_memory(unsigned long node,
 605                                 const char *uname, int depth, void *data)
 606 {
 607         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 608         cell_t *reg, *endp;
 609         unsigned long l;
 610
 611         /* Look for the ibm,dynamic-reconfiguration-memory node */
 612 /*      if (depth == 1 &&
 613                 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 614                 return early_init_dt_scan_drconf_memory(node);
 615 */
 616         /* We are scanning "memory" nodes only */
 617         if (type == NULL) {
 618                 /*
 619                  * The longtrail doesn't have a device_type on the
 620                  * /memory node, so look for the node called /memory@0.
 621                  */
 622                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
 623                         return 0;
 624         } else if (strcmp(type, "memory") != 0)
 625                 return 0;
 626
 627         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
 628         if (reg == NULL)
 629                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
 630         if (reg == NULL)
 631                 return 0;
 632
 633         endp = reg + (l / sizeof(cell_t));
 634
 635         pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
 636                 uname, l, reg[0], reg[1], reg[2], reg[3]);
 637
 638         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
 639                 u64 base, size;
 640
 641                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
 642                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
 643
 644                 if (size == 0)
 645                         continue;
 646                 pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
 647                         (unsigned long long)size);
 648
 649                 lmb_add(base, size);
 650         }
 651         return 0;
 652 }
 653
 654 #ifdef CONFIG_PHYP_DUMP
 655 /**
 656  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
 657  *
 658  * Function to find the largest size we need to reserve
 659  * during early boot process.
 660  *
 661  * It either looks for boot param and returns that OR
 662  * returns larger of 256 or 5% rounded down to multiples of 256MB.
 663  *
 664  */
 665 static inline unsigned long phyp_dump_calculate_reserve_size(void)
 666 {
 667         unsigned long tmp;
 668
 669         if (phyp_dump_info->reserve_bootvar)
 670                 return phyp_dump_info->reserve_bootvar;
 671
 672         /* divide by 20 to get 5% of value */
 673         tmp = lmb_end_of_DRAM();
 674         do_div(tmp, 20);
 675
 676         /* round it down in multiples of 256 */
 677         tmp = tmp & ~0x0FFFFFFFUL;
 678
 679         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
 680 }
 681
 682 /**
 683  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
 684  *
 685  * This routine may reserve memory regions in the kernel only
 686  * if the system is supported and a dump was taken in last
 687  * boot instance or if the hardware is supported and the
 688  * scratch area needs to be setup. In other instances it returns
 689  * without reserving anything. The memory in case of dump being
 690  * active is freed when the dump is collected (by userland tools).
 691  */
 692 static void __init phyp_dump_reserve_mem(void)
 693 {
 694         unsigned long base, size;
 695         unsigned long variable_reserve_size;
 696
 697         if (!phyp_dump_info->phyp_dump_configured) {
 698                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
 699                 return;
 700         }
 701
 702         if (!phyp_dump_info->phyp_dump_at_boot) {
 703                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
 704                 return;
 705         }
 706
 707         variable_reserve_size = phyp_dump_calculate_reserve_size();
 708
 709         if (phyp_dump_info->phyp_dump_is_active) {
 710                 /* Reserve *everything* above RMR.Area freed by userland tools*/
 711                 base = variable_reserve_size;
 712                 size = lmb_end_of_DRAM() - base;
 713
 714                 /* XXX crashed_ram_end is wrong, since it may be beyond
 715                  * the memory_limit, it will need to be adjusted. */
 716                 lmb_reserve(base, size);
 717
 718                 phyp_dump_info->init_reserve_start = base;
 719                 phyp_dump_info->init_reserve_size = size;
 720         } else {
 721                 size = phyp_dump_info->cpu_state_size +
 722                         phyp_dump_info->hpte_region_size +
 723                         variable_reserve_size;
 724                 base = lmb_end_of_DRAM() - size;
 725                 lmb_reserve(base, size);
 726                 phyp_dump_info->init_reserve_start = base;
 727                 phyp_dump_info->init_reserve_size = size;
 728         }
 729 }
 730 #else
 731 static inline void __init phyp_dump_reserve_mem(void) {}
 732 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
 733
 734 #ifdef CONFIG_EARLY_PRINTK
 735 /* MS this is Microblaze specifig function */
 736 static int __init early_init_dt_scan_serial(unsigned long node,
 737                                 const char *uname, int depth, void *data)
 738 {
 739         unsigned long l;
 740         char *p;
 741         int *addr;
 742
 743         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 744
 745 /* find all serial nodes */
 746         if (strncmp(uname, "serial", 6) != 0)
 747                 return 0;
 748
 749         early_init_dt_check_for_initrd(node);
 750
 751 /* find compatible node with uartlite */
 752         p = of_get_flat_dt_prop(node, "compatible", &l);
 753         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
 754                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
 755                 return 0;
 756
 757         addr = of_get_flat_dt_prop(node, "reg", &l);
 758         return *addr; /* return address */
 759 }
 760
 761 /* this function is looking for early uartlite console - Microblaze specific */
 762 int __init early_uartlite_console(void)
 763 {
 764         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
 765 }
 766 #endif
 767
 768 void __init early_init_devtree(void *params)
 769 {
 770         pr_debug(" -> early_init_devtree(%p)\n", params);
 771
 772         /* Setup flat device-tree pointer */
 773         initial_boot_params = params;
 774
 775 #ifdef CONFIG_PHYP_DUMP
 776         /* scan tree to see if dump occured during last boot */
 777         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
 778 #endif
 779
 780         /* Retrieve various informations from the /chosen node of the
 781          * device-tree, including the platform type, initrd location and
 782          * size, TCE reserve, and more ...
 783          */
 784         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
 785
 786         /* Scan memory nodes and rebuild LMBs */
 787         lmb_init();
 788         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 789         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 790
 791         /* Save command line for /proc/cmdline and then parse parameters */
 792         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 793         parse_early_param();
 794
 795         lmb_analyze();
 796
 797         pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
 798
 799         pr_debug("Scanning CPUs ...\n");
 800
 801         /* Retreive CPU related informations from the flat tree
 802          * (altivec support, boot CPU ID, ...)
 803          */
 804         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 805
 806         pr_debug(" <- early_init_devtree()\n");
 807 }
 808
 809 /**
 810  * Indicates whether the root node has a given value in its
 811  * compatible property.
 812  */
 813 int machine_is_compatible(const char *compat)
 814 {
 815         struct device_node *root;
 816         int rc = 0;
 817
 818         root = of_find_node_by_path("/");
 819         if (root) {
 820                 rc = of_device_is_compatible(root, compat);
 821                 of_node_put(root);
 822         }
 823         return rc;
 824 }
 825 EXPORT_SYMBOL(machine_is_compatible);
 826
 827 /*******
 828  *
 829  * New implementation of the OF "find" APIs, return a refcounted
 830  * object, call of_node_put() when done.  The device tree and list
 831  * are protected by a rw_lock.
 832  *
 833  * Note that property management will need some locking as well,
 834  * this isn't dealt with yet.
 835  *
 836  *******/
 837
 838 /**
 839  *      of_find_node_by_phandle - Find a node given a phandle
 840  *      @handle:        phandle of the node to find
 841  *
 842  *      Returns a node pointer with refcount incremented, use
 843  *      of_node_put() on it when done.
 844  */
 845 struct device_node *of_find_node_by_phandle(phandle handle)
 846 {
 847         struct device_node *np;
 848
 849         read_lock(&devtree_lock);
 850         for (np = allnodes; np != NULL; np = np->allnext)
 851                 if (np->linux_phandle == handle)
 852                         break;
 853         of_node_get(np);
 854         read_unlock(&devtree_lock);
 855         return np;
 856 }
 857 EXPORT_SYMBOL(of_find_node_by_phandle);
 858
 859 /**
 860  *      of_find_all_nodes - Get next node in global list
 861  *      @prev:  Previous node or NULL to start iteration
 862  *              of_node_put() will be called on it
 863  *
 864  *      Returns a node pointer with refcount incremented, use
 865  *      of_node_put() on it when done.
 866  */
 867 struct device_node *of_find_all_nodes(struct device_node *prev)
 868 {
 869         struct device_node *np;
 870
 871         read_lock(&devtree_lock);
 872         np = prev ? prev->allnext : allnodes;
 873         for (; np != NULL; np = np->allnext)
 874                 if (of_node_get(np))
 875                         break;
 876         of_node_put(prev);
 877         read_unlock(&devtree_lock);
 878         return np;
 879 }
 880 EXPORT_SYMBOL(of_find_all_nodes);
 881
 882 /**
 883  *      of_node_get - Increment refcount of a node
 884  *      @node:  Node to inc refcount, NULL is supported to
 885  *              simplify writing of callers
 886  *
 887  *      Returns node.
 888  */
 889 struct device_node *of_node_get(struct device_node *node)
 890 {
 891         if (node)
 892                 kref_get(&node->kref);
 893         return node;
 894 }
 895 EXPORT_SYMBOL(of_node_get);
 896
 897 static inline struct device_node *kref_to_device_node(struct kref *kref)
 898 {
 899         return container_of(kref, struct device_node, kref);
 900 }
 901
 902 /**
 903  *      of_node_release - release a dynamically allocated node
 904  *      @kref:  kref element of the node to be released
 905  *
 906  *      In of_node_put() this function is passed to kref_put()
 907  *      as the destructor.
 908  */
 909 static void of_node_release(struct kref *kref)
 910 {
 911         struct device_node *node = kref_to_device_node(kref);
 912         struct property *prop = node->properties;
 913
 914         /* We should never be releasing nodes that haven't been detached. */
 915         if (!of_node_check_flag(node, OF_DETACHED)) {
 916                 printk(KERN_INFO "WARNING: Bad of_node_put() on %s\n",
 917                         node->full_name);
 918                 dump_stack();
 919                 kref_init(&node->kref);
 920                 return;
 921         }
 922
 923         if (!of_node_check_flag(node, OF_DYNAMIC))
 924                 return;
 925
 926         while (prop) {
 927                 struct property *next = prop->next;
 928                 kfree(prop->name);
 929                 kfree(prop->value);
 930                 kfree(prop);
 931                 prop = next;
 932
 933                 if (!prop) {
 934                         prop = node->deadprops;
 935                         node->deadprops = NULL;
 936                 }
 937         }
 938         kfree(node->full_name);
 939         kfree(node->data);
 940         kfree(node);
 941 }
 942
 943 /**
 944  *      of_node_put - Decrement refcount of a node
 945  *      @node:  Node to dec refcount, NULL is supported to
 946  *              simplify writing of callers
 947  *
 948  */
 949 void of_node_put(struct device_node *node)
 950 {
 951         if (node)
 952                 kref_put(&node->kref, of_node_release);
 953 }
 954 EXPORT_SYMBOL(of_node_put);
 955
 956 /*
 957  * Plug a device node into the tree and global list.
 958  */
 959 void of_attach_node(struct device_node *np)
 960 {
 961         unsigned long flags;
 962
 963         write_lock_irqsave(&devtree_lock, flags);
 964         np->sibling = np->parent->child;
 965         np->allnext = allnodes;
 966         np->parent->child = np;
 967         allnodes = np;
 968         write_unlock_irqrestore(&devtree_lock, flags);
 969 }
 970
 971 /*
 972  * "Unplug" a node from the device tree.  The caller must hold
 973  * a reference to the node.  The memory associated with the node
 974  * is not freed until its refcount goes to zero.
 975  */
 976 void of_detach_node(struct device_node *np)
 977 {
 978         struct device_node *parent;
 979         unsigned long flags;
 980
 981         write_lock_irqsave(&devtree_lock, flags);
 982
 983         parent = np->parent;
 984         if (!parent)
 985                 goto out_unlock;
 986
 987         if (allnodes == np)
 988                 allnodes = np->allnext;
 989         else {
 990                 struct device_node *prev;
 991                 for (prev = allnodes;
 992                      prev->allnext != np;
 993                      prev = prev->allnext)
 994                         ;
 995                 prev->allnext = np->allnext;
 996         }
 997
 998         if (parent->child == np)
 999                 parent->child = np->sibling;
1000         else {
1001                 struct device_node *prevsib;
1002                 for (prevsib = np->parent->child;
1003                      prevsib->sibling != np;
1004                      prevsib = prevsib->sibling)
1005                         ;
1006                 prevsib->sibling = np->sibling;
1007         }
1008
1009         of_node_set_flag(np, OF_DETACHED);
1010
1011 out_unlock:
1012         write_unlock_irqrestore(&devtree_lock, flags);
1013 }
1014
1015 /*
1016  * Add a property to a node
1017  */
1018 int prom_add_property(struct device_node *np, struct property *prop)
1019 {
1020         struct property **next;
1021         unsigned long flags;
1022
1023         prop->next = NULL;
1024         write_lock_irqsave(&devtree_lock, flags);
1025         next = &np->properties;
1026         while (*next) {
1027                 if (strcmp(prop->name, (*next)->name) == 0) {
1028                         /* duplicate ! don't insert it */
1029                         write_unlock_irqrestore(&devtree_lock, flags);
1030                         return -1;
1031                 }
1032                 next = &(*next)->next;
1033         }
1034         *next = prop;
1035         write_unlock_irqrestore(&devtree_lock, flags);
1036
1037 #ifdef CONFIG_PROC_DEVICETREE
1038         /* try to add to proc as well if it was initialized */
1039         if (np->pde)
1040                 proc_device_tree_add_prop(np->pde, prop);
1041 #endif /* CONFIG_PROC_DEVICETREE */
1042
1043         return 0;
1044 }
1045
1046 /*
1047  * Remove a property from a node.  Note that we don't actually
1048  * remove it, since we have given out who-knows-how-many pointers
1049  * to the data using get-property.  Instead we just move the property
1050  * to the "dead properties" list, so it won't be found any more.
1051  */
1052 int prom_remove_property(struct device_node *np, struct property *prop)
1053 {
1054         struct property **next;
1055         unsigned long flags;
1056         int found = 0;
1057
1058         write_lock_irqsave(&devtree_lock, flags);
1059         next = &np->properties;
1060         while (*next) {
1061                 if (*next == prop) {
1062                         /* found the node */
1063                         *next = prop->next;
1064                         prop->next = np->deadprops;
1065                         np->deadprops = prop;
1066                         found = 1;
1067                         break;
1068                 }
1069                 next = &(*next)->next;
1070         }
1071         write_unlock_irqrestore(&devtree_lock, flags);
1072
1073         if (!found)
1074                 return -ENODEV;
1075
1076 #ifdef CONFIG_PROC_DEVICETREE
1077         /* try to remove the proc node as well */
1078         if (np->pde)
1079                 proc_device_tree_remove_prop(np->pde, prop);
1080 #endif /* CONFIG_PROC_DEVICETREE */
1081
1082         return 0;
1083 }
1084
1085 /*
1086  * Update a property in a node.  Note that we don't actually
1087  * remove it, since we have given out who-knows-how-many pointers
1088  * to the data using get-property.  Instead we just move the property
1089  * to the "dead properties" list, and add the new property to the
1090  * property list
1091  */
1092 int prom_update_property(struct device_node *np,
1093                          struct property *newprop,
1094                          struct property *oldprop)
1095 {
1096         struct property **next;
1097         unsigned long flags;
1098         int found = 0;
1099
1100         write_lock_irqsave(&devtree_lock, flags);
1101         next = &np->properties;
1102         while (*next) {
1103                 if (*next == oldprop) {
1104                         /* found the node */
1105                         newprop->next = oldprop->next;
1106                         *next = newprop;
1107                         oldprop->next = np->deadprops;
1108                         np->deadprops = oldprop;
1109                         found = 1;
1110                         break;
1111                 }
1112                 next = &(*next)->next;
1113         }
1114         write_unlock_irqrestore(&devtree_lock, flags);
1115
1116         if (!found)
1117                 return -ENODEV;
1118
1119 #ifdef CONFIG_PROC_DEVICETREE
1120         /* try to add to proc as well if it was initialized */
1121         if (np->pde)
1122                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1123 #endif /* CONFIG_PROC_DEVICETREE */
1124
1125         return 0;
1126 }
1127
1128 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1129 static struct debugfs_blob_wrapper flat_dt_blob;
1130
1131 static int __init export_flat_device_tree(void)
1132 {
1133         struct dentry *d;
1134
1135         flat_dt_blob.data = initial_boot_params;
1136         flat_dt_blob.size = initial_boot_params->totalsize;
1137
1138         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1139                                 of_debugfs_root, &flat_dt_blob);
1140         if (!d)
1141                 return 1;
1142
1143         return 0;
1144 }
1145 device_initcall(export_flat_device_tree);
1146 #endif