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 <linux/pci.h>
  43 #include <asm/sections.h>
  44 #include <asm/pci-bridge.h>
  45
  46 static int __initdata dt_root_addr_cells;
  47 static int __initdata dt_root_size_cells;
  48
  49 typedef u32 cell_t;
  50
  51 static struct boot_param_header *initial_boot_params;
  52
  53 /* export that to outside world */
  54 struct device_node *of_chosen;
  55
  56 static inline char *find_flat_dt_string(u32 offset)
  57 {
  58         return ((char *)initial_boot_params) +
  59                 initial_boot_params->off_dt_strings + offset;
  60 }
  61
  62 /**
  63  * This function is used to scan the flattened device-tree, it is
  64  * used to extract the memory informations at boot before we can
  65  * unflatten the tree
  66  */
  67 int __init of_scan_flat_dt(int (*it)(unsigned long node,
  68                                      const char *uname, int depth,
  69                                      void *data),
  70                            void *data)
  71 {
  72         unsigned long p = ((unsigned long)initial_boot_params) +
  73                 initial_boot_params->off_dt_struct;
  74         int rc = 0;
  75         int depth = -1;
  76
  77         do {
  78                 u32 tag = *((u32 *)p);
  79                 char *pathp;
  80
  81                 p += 4;
  82                 if (tag == OF_DT_END_NODE) {
  83                         depth--;
  84                         continue;
  85                 }
  86                 if (tag == OF_DT_NOP)
  87                         continue;
  88                 if (tag == OF_DT_END)
  89                         break;
  90                 if (tag == OF_DT_PROP) {
  91                         u32 sz = *((u32 *)p);
  92                         p += 8;
  93                         if (initial_boot_params->version < 0x10)
  94                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
  95                         p += sz;
  96                         p = _ALIGN(p, 4);
  97                         continue;
  98                 }
  99                 if (tag != OF_DT_BEGIN_NODE) {
 100                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
 101                                 " device tree !\n", tag);
 102                         return -EINVAL;
 103                 }
 104                 depth++;
 105                 pathp = (char *)p;
 106                 p = _ALIGN(p + strlen(pathp) + 1, 4);
 107                 if ((*pathp) == '/') {
 108                         char *lp, *np;
 109                         for (lp = NULL, np = pathp; *np; np++)
 110                                 if ((*np) == '/')
 111                                         lp = np+1;
 112                         if (lp != NULL)
 113                                 pathp = lp;
 114                 }
 115                 rc = it(p, pathp, depth, data);
 116                 if (rc != 0)
 117                         break;
 118         } while (1);
 119
 120         return rc;
 121 }
 122
 123 unsigned long __init of_get_flat_dt_root(void)
 124 {
 125         unsigned long p = ((unsigned long)initial_boot_params) +
 126                 initial_boot_params->off_dt_struct;
 127
 128         while (*((u32 *)p) == OF_DT_NOP)
 129                 p += 4;
 130         BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
 131         p += 4;
 132         return _ALIGN(p + strlen((char *)p) + 1, 4);
 133 }
 134
 135 /**
 136  * This function can be used within scan_flattened_dt callback to get
 137  * access to properties
 138  */
 139 void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
 140                                 unsigned long *size)
 141 {
 142         unsigned long p = node;
 143
 144         do {
 145                 u32 tag = *((u32 *)p);
 146                 u32 sz, noff;
 147                 const char *nstr;
 148
 149                 p += 4;
 150                 if (tag == OF_DT_NOP)
 151                         continue;
 152                 if (tag != OF_DT_PROP)
 153                         return NULL;
 154
 155                 sz = *((u32 *)p);
 156                 noff = *((u32 *)(p + 4));
 157                 p += 8;
 158                 if (initial_boot_params->version < 0x10)
 159                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
 160
 161                 nstr = find_flat_dt_string(noff);
 162                 if (nstr == NULL) {
 163                         printk(KERN_WARNING "Can't find property index"
 164                                 " name !\n");
 165                         return NULL;
 166                 }
 167                 if (strcmp(name, nstr) == 0) {
 168                         if (size)
 169                                 *size = sz;
 170                         return (void *)p;
 171                 }
 172                 p += sz;
 173                 p = _ALIGN(p, 4);
 174         } while (1);
 175 }
 176
 177 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
 178 {
 179         const char *cp;
 180         unsigned long cplen, l;
 181
 182         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
 183         if (cp == NULL)
 184                 return 0;
 185         while (cplen > 0) {
 186                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
 187                         return 1;
 188                 l = strlen(cp) + 1;
 189                 cp += l;
 190                 cplen -= l;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
 197                                         unsigned long align)
 198 {
 199         void *res;
 200
 201         *mem = _ALIGN(*mem, align);
 202         res = (void *)*mem;
 203         *mem += size;
 204
 205         return res;
 206 }
 207
 208 static unsigned long __init unflatten_dt_node(unsigned long mem,
 209                                         unsigned long *p,
 210                                         struct device_node *dad,
 211                                         struct device_node ***allnextpp,
 212                                         unsigned long fpsize)
 213 {
 214         struct device_node *np;
 215         struct property *pp, **prev_pp = NULL;
 216         char *pathp;
 217         u32 tag;
 218         unsigned int l, allocl;
 219         int has_name = 0;
 220         int new_format = 0;
 221
 222         tag = *((u32 *)(*p));
 223         if (tag != OF_DT_BEGIN_NODE) {
 224                 printk("Weird tag at start of node: %x\n", tag);
 225                 return mem;
 226         }
 227         *p += 4;
 228         pathp = (char *)*p;
 229         l = allocl = strlen(pathp) + 1;
 230         *p = _ALIGN(*p + l, 4);
 231
 232         /* version 0x10 has a more compact unit name here instead of the full
 233          * path. we accumulate the full path size using "fpsize", we'll rebuild
 234          * it later. We detect this because the first character of the name is
 235          * not '/'.
 236          */
 237         if ((*pathp) != '/') {
 238                 new_format = 1;
 239                 if (fpsize == 0) {
 240                         /* root node: special case. fpsize accounts for path
 241                          * plus terminating zero. root node only has '/', so
 242                          * fpsize should be 2, but we want to avoid the first
 243                          * level nodes to have two '/' so we use fpsize 1 here
 244                          */
 245                         fpsize = 1;
 246                         allocl = 2;
 247                 } else {
 248                         /* account for '/' and path size minus terminal 0
 249                          * already in 'l'
 250                          */
 251                         fpsize += l;
 252                         allocl = fpsize;
 253                 }
 254         }
 255
 256         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
 257                                 __alignof__(struct device_node));
 258         if (allnextpp) {
 259                 memset(np, 0, sizeof(*np));
 260                 np->full_name = ((char *)np) + sizeof(struct device_node);
 261                 if (new_format) {
 262                         char *p2 = np->full_name;
 263                         /* rebuild full path for new format */
 264                         if (dad && dad->parent) {
 265                                 strcpy(p2, dad->full_name);
 266 #ifdef DEBUG
 267                                 if ((strlen(p2) + l + 1) != allocl) {
 268                                         pr_debug("%s: p: %d, l: %d, a: %d\n",
 269                                                 pathp, (int)strlen(p2),
 270                                                 l, allocl);
 271                                 }
 272 #endif
 273                                 p2 += strlen(p2);
 274                         }
 275                         *(p2++) = '/';
 276                         memcpy(p2, pathp, l);
 277                 } else
 278                         memcpy(np->full_name, pathp, l);
 279                 prev_pp = &np->properties;
 280                 **allnextpp = np;
 281                 *allnextpp = &np->allnext;
 282                 if (dad != NULL) {
 283                         np->parent = dad;
 284                         /* we temporarily use the next field as `last_child'*/
 285                         if (dad->next == NULL)
 286                                 dad->child = np;
 287                         else
 288                                 dad->next->sibling = np;
 289                         dad->next = np;
 290                 }
 291                 kref_init(&np->kref);
 292         }
 293         while (1) {
 294                 u32 sz, noff;
 295                 char *pname;
 296
 297                 tag = *((u32 *)(*p));
 298                 if (tag == OF_DT_NOP) {
 299                         *p += 4;
 300                         continue;
 301                 }
 302                 if (tag != OF_DT_PROP)
 303                         break;
 304                 *p += 4;
 305                 sz = *((u32 *)(*p));
 306                 noff = *((u32 *)((*p) + 4));
 307                 *p += 8;
 308                 if (initial_boot_params->version < 0x10)
 309                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
 310
 311                 pname = find_flat_dt_string(noff);
 312                 if (pname == NULL) {
 313                         printk(KERN_INFO
 314                                 "Can't find property name in list !\n");
 315                         break;
 316                 }
 317                 if (strcmp(pname, "name") == 0)
 318                         has_name = 1;
 319                 l = strlen(pname) + 1;
 320                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
 321                                         __alignof__(struct property));
 322                 if (allnextpp) {
 323                         if (strcmp(pname, "linux,phandle") == 0) {
 324                                 np->node = *((u32 *)*p);
 325                                 if (np->linux_phandle == 0)
 326                                         np->linux_phandle = np->node;
 327                         }
 328                         if (strcmp(pname, "ibm,phandle") == 0)
 329                                 np->linux_phandle = *((u32 *)*p);
 330                         pp->name = pname;
 331                         pp->length = sz;
 332                         pp->value = (void *)*p;
 333                         *prev_pp = pp;
 334                         prev_pp = &pp->next;
 335                 }
 336                 *p = _ALIGN((*p) + sz, 4);
 337         }
 338         /* with version 0x10 we may not have the name property, recreate
 339          * it here from the unit name if absent
 340          */
 341         if (!has_name) {
 342                 char *p1 = pathp, *ps = pathp, *pa = NULL;
 343                 int sz;
 344
 345                 while (*p1) {
 346                         if ((*p1) == '@')
 347                                 pa = p1;
 348                         if ((*p1) == '/')
 349                                 ps = p1 + 1;
 350                         p1++;
 351                 }
 352                 if (pa < ps)
 353                         pa = p1;
 354                 sz = (pa - ps) + 1;
 355                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
 356                                         __alignof__(struct property));
 357                 if (allnextpp) {
 358                         pp->name = "name";
 359                         pp->length = sz;
 360                         pp->value = pp + 1;
 361                         *prev_pp = pp;
 362                         prev_pp = &pp->next;
 363                         memcpy(pp->value, ps, sz - 1);
 364                         ((char *)pp->value)[sz - 1] = 0;
 365                         pr_debug("fixed up name for %s -> %s\n", pathp,
 366                                 (char *)pp->value);
 367                 }
 368         }
 369         if (allnextpp) {
 370                 *prev_pp = NULL;
 371                 np->name = of_get_property(np, "name", NULL);
 372                 np->type = of_get_property(np, "device_type", NULL);
 373
 374                 if (!np->name)
 375                         np->name = "<NULL>";
 376                 if (!np->type)
 377                         np->type = "<NULL>";
 378         }
 379         while (tag == OF_DT_BEGIN_NODE) {
 380                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
 381                 tag = *((u32 *)(*p));
 382         }
 383         if (tag != OF_DT_END_NODE) {
 384                 printk(KERN_INFO "Weird tag at end of node: %x\n", tag);
 385                 return mem;
 386         }
 387         *p += 4;
 388         return mem;
 389 }
 390
 391 /**
 392  * unflattens the device-tree passed by the firmware, creating the
 393  * tree of struct device_node. It also fills the "name" and "type"
 394  * pointers of the nodes so the normal device-tree walking functions
 395  * can be used (this used to be done by finish_device_tree)
 396  */
 397 void __init unflatten_device_tree(void)
 398 {
 399         unsigned long start, mem, size;
 400         struct device_node **allnextp = &allnodes;
 401
 402         pr_debug(" -> unflatten_device_tree()\n");
 403
 404         /* First pass, scan for size */
 405         start = ((unsigned long)initial_boot_params) +
 406                 initial_boot_params->off_dt_struct;
 407         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
 408         size = (size | 3) + 1;
 409
 410         pr_debug("  size is %lx, allocating...\n", size);
 411
 412         /* Allocate memory for the expanded device tree */
 413         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
 414         mem = (unsigned long) __va(mem);
 415
 416         ((u32 *)mem)[size / 4] = 0xdeadbeef;
 417
 418         pr_debug("  unflattening %lx...\n", mem);
 419
 420         /* Second pass, do actual unflattening */
 421         start = ((unsigned long)initial_boot_params) +
 422                 initial_boot_params->off_dt_struct;
 423         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
 424         if (*((u32 *)start) != OF_DT_END)
 425                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n",
 426                         *((u32 *)start));
 427         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
 428                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
 429                         ((u32 *)mem)[size / 4]);
 430         *allnextp = NULL;
 431
 432         /* Get pointer to OF "/chosen" node for use everywhere */
 433         of_chosen = of_find_node_by_path("/chosen");
 434         if (of_chosen == NULL)
 435                 of_chosen = of_find_node_by_path("/chosen@0");
 436
 437         pr_debug(" <- unflatten_device_tree()\n");
 438 }
 439
 440 #define early_init_dt_scan_drconf_memory(node) 0
 441
 442 static int __init early_init_dt_scan_cpus(unsigned long node,
 443                                           const char *uname, int depth,
 444                                           void *data)
 445 {
 446         static int logical_cpuid;
 447         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 448         const u32 *intserv;
 449         int i, nthreads;
 450         int found = 0;
 451
 452         /* We are scanning "cpu" nodes only */
 453         if (type == NULL || strcmp(type, "cpu") != 0)
 454                 return 0;
 455
 456         /* Get physical cpuid */
 457         intserv = of_get_flat_dt_prop(node, "reg", NULL);
 458         nthreads = 1;
 459
 460         /*
 461          * Now see if any of these threads match our boot cpu.
 462          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 463          */
 464         for (i = 0; i < nthreads; i++) {
 465                 /*
 466                  * version 2 of the kexec param format adds the phys cpuid of
 467                  * booted proc.
 468                  */
 469                 if (initial_boot_params && initial_boot_params->version >= 2) {
 470                         if (intserv[i] ==
 471                                         initial_boot_params->boot_cpuid_phys) {
 472                                 found = 1;
 473                                 break;
 474                         }
 475                 } else {
 476                         /*
 477                          * Check if it's the boot-cpu, set it's hw index now,
 478                          * unfortunately this format did not support booting
 479                          * off secondary threads.
 480                          */
 481                         if (of_get_flat_dt_prop(node,
 482                                         "linux,boot-cpu", NULL) != NULL) {
 483                                 found = 1;
 484                                 break;
 485                         }
 486                 }
 487
 488 #ifdef CONFIG_SMP
 489                 /* logical cpu id is always 0 on UP kernels */
 490                 logical_cpuid++;
 491 #endif
 492         }
 493
 494         if (found) {
 495                 pr_debug("boot cpu: logical %d physical %d\n", logical_cpuid,
 496                         intserv[i]);
 497                 boot_cpuid = logical_cpuid;
 498         }
 499
 500         return 0;
 501 }
 502
 503 #ifdef CONFIG_BLK_DEV_INITRD
 504 static void __init early_init_dt_check_for_initrd(unsigned long node)
 505 {
 506         unsigned long l;
 507         u32 *prop;
 508
 509         pr_debug("Looking for initrd properties... ");
 510
 511         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
 512         if (prop) {
 513                 initrd_start = (unsigned long)__va(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(of_read_ulong(prop, l/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         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 568                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 569 #endif /* CONFIG_CMDLINE */
 570
 571         pr_debug("Command line is: %s\n", cmd_line);
 572
 573         /* break now */
 574         return 1;
 575 }
 576
 577 static int __init early_init_dt_scan_root(unsigned long node,
 578                                 const char *uname, int depth, void *data)
 579 {
 580         u32 *prop;
 581
 582         if (depth != 0)
 583                 return 0;
 584
 585         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
 586         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
 587         pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
 588
 589         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
 590         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
 591         pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
 592
 593         /* break now */
 594         return 1;
 595 }
 596
 597 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
 598 {
 599         cell_t *p = *cellp;
 600
 601         *cellp = p + s;
 602         return of_read_number(p, s);
 603 }
 604
 605 static int __init early_init_dt_scan_memory(unsigned long node,
 606                                 const char *uname, int depth, void *data)
 607 {
 608         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 609         cell_t *reg, *endp;
 610         unsigned long l;
 611
 612         /* Look for the ibm,dynamic-reconfiguration-memory node */
 613 /*      if (depth == 1 &&
 614                 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 615                 return early_init_dt_scan_drconf_memory(node);
 616 */
 617         /* We are scanning "memory" nodes only */
 618         if (type == NULL) {
 619                 /*
 620                  * The longtrail doesn't have a device_type on the
 621                  * /memory node, so look for the node called /memory@0.
 622                  */
 623                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
 624                         return 0;
 625         } else if (strcmp(type, "memory") != 0)
 626                 return 0;
 627
 628         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
 629         if (reg == NULL)
 630                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
 631         if (reg == NULL)
 632                 return 0;
 633
 634         endp = reg + (l / sizeof(cell_t));
 635
 636         pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
 637                 uname, l, reg[0], reg[1], reg[2], reg[3]);
 638
 639         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
 640                 u64 base, size;
 641
 642                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
 643                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
 644
 645                 if (size == 0)
 646                         continue;
 647                 pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
 648                         (unsigned long long)size);
 649
 650                 lmb_add(base, size);
 651         }
 652         return 0;
 653 }
 654
 655 #ifdef CONFIG_PHYP_DUMP
 656 /**
 657  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
 658  *
 659  * Function to find the largest size we need to reserve
 660  * during early boot process.
 661  *
 662  * It either looks for boot param and returns that OR
 663  * returns larger of 256 or 5% rounded down to multiples of 256MB.
 664  *
 665  */
 666 static inline unsigned long phyp_dump_calculate_reserve_size(void)
 667 {
 668         unsigned long tmp;
 669
 670         if (phyp_dump_info->reserve_bootvar)
 671                 return phyp_dump_info->reserve_bootvar;
 672
 673         /* divide by 20 to get 5% of value */
 674         tmp = lmb_end_of_DRAM();
 675         do_div(tmp, 20);
 676
 677         /* round it down in multiples of 256 */
 678         tmp = tmp & ~0x0FFFFFFFUL;
 679
 680         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
 681 }
 682
 683 /**
 684  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
 685  *
 686  * This routine may reserve memory regions in the kernel only
 687  * if the system is supported and a dump was taken in last
 688  * boot instance or if the hardware is supported and the
 689  * scratch area needs to be setup. In other instances it returns
 690  * without reserving anything. The memory in case of dump being
 691  * active is freed when the dump is collected (by userland tools).
 692  */
 693 static void __init phyp_dump_reserve_mem(void)
 694 {
 695         unsigned long base, size;
 696         unsigned long variable_reserve_size;
 697
 698         if (!phyp_dump_info->phyp_dump_configured) {
 699                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
 700                 return;
 701         }
 702
 703         if (!phyp_dump_info->phyp_dump_at_boot) {
 704                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
 705                 return;
 706         }
 707
 708         variable_reserve_size = phyp_dump_calculate_reserve_size();
 709
 710         if (phyp_dump_info->phyp_dump_is_active) {
 711                 /* Reserve *everything* above RMR.Area freed by userland tools*/
 712                 base = variable_reserve_size;
 713                 size = lmb_end_of_DRAM() - base;
 714
 715                 /* XXX crashed_ram_end is wrong, since it may be beyond
 716                  * the memory_limit, it will need to be adjusted. */
 717                 lmb_reserve(base, size);
 718
 719                 phyp_dump_info->init_reserve_start = base;
 720                 phyp_dump_info->init_reserve_size = size;
 721         } else {
 722                 size = phyp_dump_info->cpu_state_size +
 723                         phyp_dump_info->hpte_region_size +
 724                         variable_reserve_size;
 725                 base = lmb_end_of_DRAM() - size;
 726                 lmb_reserve(base, size);
 727                 phyp_dump_info->init_reserve_start = base;
 728                 phyp_dump_info->init_reserve_size = size;
 729         }
 730 }
 731 #else
 732 static inline void __init phyp_dump_reserve_mem(void) {}
 733 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
 734
 735 #ifdef CONFIG_EARLY_PRINTK
 736 /* MS this is Microblaze specifig function */
 737 static int __init early_init_dt_scan_serial(unsigned long node,
 738                                 const char *uname, int depth, void *data)
 739 {
 740         unsigned long l;
 741         char *p;
 742         int *addr;
 743
 744         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 745
 746 /* find all serial nodes */
 747         if (strncmp(uname, "serial", 6) != 0)
 748                 return 0;
 749
 750         early_init_dt_check_for_initrd(node);
 751
 752 /* find compatible node with uartlite */
 753         p = of_get_flat_dt_prop(node, "compatible", &l);
 754         if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
 755                         (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
 756                 return 0;
 757
 758         addr = of_get_flat_dt_prop(node, "reg", &l);
 759         return *addr; /* return address */
 760 }
 761
 762 /* this function is looking for early uartlite console - Microblaze specific */
 763 int __init early_uartlite_console(void)
 764 {
 765         return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
 766 }
 767 #endif
 768
 769 void __init early_init_devtree(void *params)
 770 {
 771         pr_debug(" -> early_init_devtree(%p)\n", params);
 772
 773         /* Setup flat device-tree pointer */
 774         initial_boot_params = params;
 775
 776 #ifdef CONFIG_PHYP_DUMP
 777         /* scan tree to see if dump occured during last boot */
 778         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
 779 #endif
 780
 781         /* Retrieve various informations from the /chosen node of the
 782          * device-tree, including the platform type, initrd location and
 783          * size, TCE reserve, and more ...
 784          */
 785         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
 786
 787         /* Scan memory nodes and rebuild LMBs */
 788         lmb_init();
 789         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 790         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 791
 792         /* Save command line for /proc/cmdline and then parse parameters */
 793         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 794         parse_early_param();
 795
 796         lmb_analyze();
 797
 798         pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
 799
 800         pr_debug("Scanning CPUs ...\n");
 801
 802         /* Retreive CPU related informations from the flat tree
 803          * (altivec support, boot CPU ID, ...)
 804          */
 805         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 806
 807         pr_debug(" <- early_init_devtree()\n");
 808 }
 809
 810 /**
 811  * Indicates whether the root node has a given value in its
 812  * compatible property.
 813  */
 814 int machine_is_compatible(const char *compat)
 815 {
 816         struct device_node *root;
 817         int rc = 0;
 818
 819         root = of_find_node_by_path("/");
 820         if (root) {
 821                 rc = of_device_is_compatible(root, compat);
 822                 of_node_put(root);
 823         }
 824         return rc;
 825 }
 826 EXPORT_SYMBOL(machine_is_compatible);
 827
 828 /*******
 829  *
 830  * New implementation of the OF "find" APIs, return a refcounted
 831  * object, call of_node_put() when done.  The device tree and list
 832  * are protected by a rw_lock.
 833  *
 834  * Note that property management will need some locking as well,
 835  * this isn't dealt with yet.
 836  *
 837  *******/
 838
 839 /**
 840  *      of_find_node_by_phandle - Find a node given a phandle
 841  *      @handle:        phandle of the node to find
 842  *
 843  *      Returns a node pointer with refcount incremented, use
 844  *      of_node_put() on it when done.
 845  */
 846 struct device_node *of_find_node_by_phandle(phandle handle)
 847 {
 848         struct device_node *np;
 849
 850         read_lock(&devtree_lock);
 851         for (np = allnodes; np != NULL; np = np->allnext)
 852                 if (np->linux_phandle == handle)
 853                         break;
 854         of_node_get(np);
 855         read_unlock(&devtree_lock);
 856         return np;
 857 }
 858 EXPORT_SYMBOL(of_find_node_by_phandle);
 859
 860 /**
 861  *      of_find_all_nodes - Get next node in global list
 862  *      @prev:  Previous node or NULL to start iteration
 863  *              of_node_put() will be called on it
 864  *
 865  *      Returns a node pointer with refcount incremented, use
 866  *      of_node_put() on it when done.
 867  */
 868 struct device_node *of_find_all_nodes(struct device_node *prev)
 869 {
 870         struct device_node *np;
 871
 872         read_lock(&devtree_lock);
 873         np = prev ? prev->allnext : allnodes;
 874         for (; np != NULL; np = np->allnext)
 875                 if (of_node_get(np))
 876                         break;
 877         of_node_put(prev);
 878         read_unlock(&devtree_lock);
 879         return np;
 880 }
 881 EXPORT_SYMBOL(of_find_all_nodes);
 882
 883 /**
 884  *      of_node_get - Increment refcount of a node
 885  *      @node:  Node to inc refcount, NULL is supported to
 886  *              simplify writing of callers
 887  *
 888  *      Returns node.
 889  */
 890 struct device_node *of_node_get(struct device_node *node)
 891 {
 892         if (node)
 893                 kref_get(&node->kref);
 894         return node;
 895 }
 896 EXPORT_SYMBOL(of_node_get);
 897
 898 static inline struct device_node *kref_to_device_node(struct kref *kref)
 899 {
 900         return container_of(kref, struct device_node, kref);
 901 }
 902
 903 /**
 904  *      of_node_release - release a dynamically allocated node
 905  *      @kref:  kref element of the node to be released
 906  *
 907  *      In of_node_put() this function is passed to kref_put()
 908  *      as the destructor.
 909  */
 910 static void of_node_release(struct kref *kref)
 911 {
 912         struct device_node *node = kref_to_device_node(kref);
 913         struct property *prop = node->properties;
 914
 915         /* We should never be releasing nodes that haven't been detached. */
 916         if (!of_node_check_flag(node, OF_DETACHED)) {
 917                 printk(KERN_INFO "WARNING: Bad of_node_put() on %s\n",
 918                         node->full_name);
 919                 dump_stack();
 920                 kref_init(&node->kref);
 921                 return;
 922         }
 923
 924         if (!of_node_check_flag(node, OF_DYNAMIC))
 925                 return;
 926
 927         while (prop) {
 928                 struct property *next = prop->next;
 929                 kfree(prop->name);
 930                 kfree(prop->value);
 931                 kfree(prop);
 932                 prop = next;
 933
 934                 if (!prop) {
 935                         prop = node->deadprops;
 936                         node->deadprops = NULL;
 937                 }
 938         }
 939         kfree(node->full_name);
 940         kfree(node->data);
 941         kfree(node);
 942 }
 943
 944 /**
 945  *      of_node_put - Decrement refcount of a node
 946  *      @node:  Node to dec refcount, NULL is supported to
 947  *              simplify writing of callers
 948  *
 949  */
 950 void of_node_put(struct device_node *node)
 951 {
 952         if (node)
 953                 kref_put(&node->kref, of_node_release);
 954 }
 955 EXPORT_SYMBOL(of_node_put);
 956
 957 /*
 958  * Plug a device node into the tree and global list.
 959  */
 960 void of_attach_node(struct device_node *np)
 961 {
 962         unsigned long flags;
 963
 964         write_lock_irqsave(&devtree_lock, flags);
 965         np->sibling = np->parent->child;
 966         np->allnext = allnodes;
 967         np->parent->child = np;
 968         allnodes = np;
 969         write_unlock_irqrestore(&devtree_lock, flags);
 970 }
 971
 972 /*
 973  * "Unplug" a node from the device tree.  The caller must hold
 974  * a reference to the node.  The memory associated with the node
 975  * is not freed until its refcount goes to zero.
 976  */
 977 void of_detach_node(struct device_node *np)
 978 {
 979         struct device_node *parent;
 980         unsigned long flags;
 981
 982         write_lock_irqsave(&devtree_lock, flags);
 983
 984         parent = np->parent;
 985         if (!parent)
 986                 goto out_unlock;
 987
 988         if (allnodes == np)
 989                 allnodes = np->allnext;
 990         else {
 991                 struct device_node *prev;
 992                 for (prev = allnodes;
 993                      prev->allnext != np;
 994                      prev = prev->allnext)
 995                         ;
 996                 prev->allnext = np->allnext;
 997         }
 998
 999         if (parent->child == np)
1000                 parent->child = np->sibling;
1001         else {
1002                 struct device_node *prevsib;
1003                 for (prevsib = np->parent->child;
1004                      prevsib->sibling != np;
1005                      prevsib = prevsib->sibling)
1006                         ;
1007                 prevsib->sibling = np->sibling;
1008         }
1009
1010         of_node_set_flag(np, OF_DETACHED);
1011
1012 out_unlock:
1013         write_unlock_irqrestore(&devtree_lock, flags);
1014 }
1015
1016 /*
1017  * Add a property to a node
1018  */
1019 int prom_add_property(struct device_node *np, struct property *prop)
1020 {
1021         struct property **next;
1022         unsigned long flags;
1023
1024         prop->next = NULL;
1025         write_lock_irqsave(&devtree_lock, flags);
1026         next = &np->properties;
1027         while (*next) {
1028                 if (strcmp(prop->name, (*next)->name) == 0) {
1029                         /* duplicate ! don't insert it */
1030                         write_unlock_irqrestore(&devtree_lock, flags);
1031                         return -1;
1032                 }
1033                 next = &(*next)->next;
1034         }
1035         *next = prop;
1036         write_unlock_irqrestore(&devtree_lock, flags);
1037
1038 #ifdef CONFIG_PROC_DEVICETREE
1039         /* try to add to proc as well if it was initialized */
1040         if (np->pde)
1041                 proc_device_tree_add_prop(np->pde, prop);
1042 #endif /* CONFIG_PROC_DEVICETREE */
1043
1044         return 0;
1045 }
1046
1047 /*
1048  * Remove a property from a node.  Note that we don't actually
1049  * remove it, since we have given out who-knows-how-many pointers
1050  * to the data using get-property.  Instead we just move the property
1051  * to the "dead properties" list, so it won't be found any more.
1052  */
1053 int prom_remove_property(struct device_node *np, struct property *prop)
1054 {
1055         struct property **next;
1056         unsigned long flags;
1057         int found = 0;
1058
1059         write_lock_irqsave(&devtree_lock, flags);
1060         next = &np->properties;
1061         while (*next) {
1062                 if (*next == prop) {
1063                         /* found the node */
1064                         *next = prop->next;
1065                         prop->next = np->deadprops;
1066                         np->deadprops = prop;
1067                         found = 1;
1068                         break;
1069                 }
1070                 next = &(*next)->next;
1071         }
1072         write_unlock_irqrestore(&devtree_lock, flags);
1073
1074         if (!found)
1075                 return -ENODEV;
1076
1077 #ifdef CONFIG_PROC_DEVICETREE
1078         /* try to remove the proc node as well */
1079         if (np->pde)
1080                 proc_device_tree_remove_prop(np->pde, prop);
1081 #endif /* CONFIG_PROC_DEVICETREE */
1082
1083         return 0;
1084 }
1085
1086 /*
1087  * Update a property in a node.  Note that we don't actually
1088  * remove it, since we have given out who-knows-how-many pointers
1089  * to the data using get-property.  Instead we just move the property
1090  * to the "dead properties" list, and add the new property to the
1091  * property list
1092  */
1093 int prom_update_property(struct device_node *np,
1094                          struct property *newprop,
1095                          struct property *oldprop)
1096 {
1097         struct property **next;
1098         unsigned long flags;
1099         int found = 0;
1100
1101         write_lock_irqsave(&devtree_lock, flags);
1102         next = &np->properties;
1103         while (*next) {
1104                 if (*next == oldprop) {
1105                         /* found the node */
1106                         newprop->next = oldprop->next;
1107                         *next = newprop;
1108                         oldprop->next = np->deadprops;
1109                         np->deadprops = oldprop;
1110                         found = 1;
1111                         break;
1112                 }
1113                 next = &(*next)->next;
1114         }
1115         write_unlock_irqrestore(&devtree_lock, flags);
1116
1117         if (!found)
1118                 return -ENODEV;
1119
1120 #ifdef CONFIG_PROC_DEVICETREE
1121         /* try to add to proc as well if it was initialized */
1122         if (np->pde)
1123                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1124 #endif /* CONFIG_PROC_DEVICETREE */
1125
1126         return 0;
1127 }
1128
1129 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1130 static struct debugfs_blob_wrapper flat_dt_blob;
1131
1132 static int __init export_flat_device_tree(void)
1133 {
1134         struct dentry *d;
1135
1136         flat_dt_blob.data = initial_boot_params;
1137         flat_dt_blob.size = initial_boot_params->totalsize;
1138
1139         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1140                                 of_debugfs_root, &flat_dt_blob);
1141         if (!d)
1142                 return 1;
1143
1144         return 0;
1145 }
1146 device_initcall(export_flat_device_tree);
1147 #endif