Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Procedures for creating, accessing and interpreting the device tree. |
| 3 | * |
| 4 | * Paul Mackerras August 1996. |
| 5 | * Copyright (C) 1996-2005 Paul Mackerras. |
| 6 | * |
| 7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
| 8 | * {engebret|bergner}@us.ibm.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #undef DEBUG |
| 17 | |
| 18 | #include <stdarg.h> |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/threads.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/stringify.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/initrd.h> |
| 29 | #include <linux/bitops.h> |
| 30 | #include <linux/module.h> |
Michael Ellerman | dcee303 | 2005-12-04 18:39:48 +1100 | [diff] [blame] | 31 | #include <linux/kexec.h> |
Michael Ellerman | 7a4571a | 2006-06-23 18:16:03 +1000 | [diff] [blame] | 32 | #include <linux/debugfs.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 33 | #include <linux/irq.h> |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 34 | |
| 35 | #include <asm/prom.h> |
| 36 | #include <asm/rtas.h> |
| 37 | #include <asm/lmb.h> |
| 38 | #include <asm/page.h> |
| 39 | #include <asm/processor.h> |
| 40 | #include <asm/irq.h> |
| 41 | #include <asm/io.h> |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 42 | #include <asm/kdump.h> |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 43 | #include <asm/smp.h> |
| 44 | #include <asm/system.h> |
| 45 | #include <asm/mmu.h> |
| 46 | #include <asm/pgtable.h> |
| 47 | #include <asm/pci.h> |
| 48 | #include <asm/iommu.h> |
| 49 | #include <asm/btext.h> |
| 50 | #include <asm/sections.h> |
| 51 | #include <asm/machdep.h> |
| 52 | #include <asm/pSeries_reconfig.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 53 | #include <asm/pci-bridge.h> |
Michael Ellerman | 2babf5c | 2006-05-17 18:00:46 +1000 | [diff] [blame] | 54 | #include <asm/kexec.h> |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 55 | |
| 56 | #ifdef DEBUG |
| 57 | #define DBG(fmt...) printk(KERN_ERR fmt) |
| 58 | #else |
| 59 | #define DBG(fmt...) |
| 60 | #endif |
| 61 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 62 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 63 | static int __initdata dt_root_addr_cells; |
| 64 | static int __initdata dt_root_size_cells; |
| 65 | |
| 66 | #ifdef CONFIG_PPC64 |
Olof Johansson | 2889773 | 2006-04-12 21:52:33 -0500 | [diff] [blame] | 67 | int __initdata iommu_is_off; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 68 | int __initdata iommu_force_on; |
Paul Mackerras | cf00a8d | 2005-10-31 13:07:02 +1100 | [diff] [blame] | 69 | unsigned long tce_alloc_start, tce_alloc_end; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 70 | #endif |
| 71 | |
| 72 | typedef u32 cell_t; |
| 73 | |
| 74 | #if 0 |
| 75 | static struct boot_param_header *initial_boot_params __initdata; |
| 76 | #else |
| 77 | struct boot_param_header *initial_boot_params; |
| 78 | #endif |
| 79 | |
| 80 | static struct device_node *allnodes = NULL; |
| 81 | |
| 82 | /* use when traversing tree through the allnext, child, sibling, |
| 83 | * or parent members of struct device_node. |
| 84 | */ |
| 85 | static DEFINE_RWLOCK(devtree_lock); |
| 86 | |
| 87 | /* export that to outside world */ |
| 88 | struct device_node *of_chosen; |
| 89 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 90 | static inline char *find_flat_dt_string(u32 offset) |
| 91 | { |
| 92 | return ((char *)initial_boot_params) + |
| 93 | initial_boot_params->off_dt_strings + offset; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * This function is used to scan the flattened device-tree, it is |
| 98 | * used to extract the memory informations at boot before we can |
| 99 | * unflatten the tree |
| 100 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 101 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
| 102 | const char *uname, int depth, |
| 103 | void *data), |
| 104 | void *data) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 105 | { |
| 106 | unsigned long p = ((unsigned long)initial_boot_params) + |
| 107 | initial_boot_params->off_dt_struct; |
| 108 | int rc = 0; |
| 109 | int depth = -1; |
| 110 | |
| 111 | do { |
| 112 | u32 tag = *((u32 *)p); |
| 113 | char *pathp; |
| 114 | |
| 115 | p += 4; |
| 116 | if (tag == OF_DT_END_NODE) { |
| 117 | depth --; |
| 118 | continue; |
| 119 | } |
| 120 | if (tag == OF_DT_NOP) |
| 121 | continue; |
| 122 | if (tag == OF_DT_END) |
| 123 | break; |
| 124 | if (tag == OF_DT_PROP) { |
| 125 | u32 sz = *((u32 *)p); |
| 126 | p += 8; |
| 127 | if (initial_boot_params->version < 0x10) |
| 128 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
| 129 | p += sz; |
| 130 | p = _ALIGN(p, 4); |
| 131 | continue; |
| 132 | } |
| 133 | if (tag != OF_DT_BEGIN_NODE) { |
| 134 | printk(KERN_WARNING "Invalid tag %x scanning flattened" |
| 135 | " device tree !\n", tag); |
| 136 | return -EINVAL; |
| 137 | } |
| 138 | depth++; |
| 139 | pathp = (char *)p; |
| 140 | p = _ALIGN(p + strlen(pathp) + 1, 4); |
| 141 | if ((*pathp) == '/') { |
| 142 | char *lp, *np; |
| 143 | for (lp = NULL, np = pathp; *np; np++) |
| 144 | if ((*np) == '/') |
| 145 | lp = np+1; |
| 146 | if (lp != NULL) |
| 147 | pathp = lp; |
| 148 | } |
| 149 | rc = it(p, pathp, depth, data); |
| 150 | if (rc != 0) |
| 151 | break; |
| 152 | } while(1); |
| 153 | |
| 154 | return rc; |
| 155 | } |
| 156 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 157 | unsigned long __init of_get_flat_dt_root(void) |
| 158 | { |
| 159 | unsigned long p = ((unsigned long)initial_boot_params) + |
| 160 | initial_boot_params->off_dt_struct; |
| 161 | |
| 162 | while(*((u32 *)p) == OF_DT_NOP) |
| 163 | p += 4; |
| 164 | BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE); |
| 165 | p += 4; |
| 166 | return _ALIGN(p + strlen((char *)p) + 1, 4); |
| 167 | } |
| 168 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 169 | /** |
| 170 | * This function can be used within scan_flattened_dt callback to get |
| 171 | * access to properties |
| 172 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 173 | void* __init of_get_flat_dt_prop(unsigned long node, const char *name, |
| 174 | unsigned long *size) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 175 | { |
| 176 | unsigned long p = node; |
| 177 | |
| 178 | do { |
| 179 | u32 tag = *((u32 *)p); |
| 180 | u32 sz, noff; |
| 181 | const char *nstr; |
| 182 | |
| 183 | p += 4; |
| 184 | if (tag == OF_DT_NOP) |
| 185 | continue; |
| 186 | if (tag != OF_DT_PROP) |
| 187 | return NULL; |
| 188 | |
| 189 | sz = *((u32 *)p); |
| 190 | noff = *((u32 *)(p + 4)); |
| 191 | p += 8; |
| 192 | if (initial_boot_params->version < 0x10) |
| 193 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
| 194 | |
| 195 | nstr = find_flat_dt_string(noff); |
| 196 | if (nstr == NULL) { |
| 197 | printk(KERN_WARNING "Can't find property index" |
| 198 | " name !\n"); |
| 199 | return NULL; |
| 200 | } |
| 201 | if (strcmp(name, nstr) == 0) { |
| 202 | if (size) |
| 203 | *size = sz; |
| 204 | return (void *)p; |
| 205 | } |
| 206 | p += sz; |
| 207 | p = _ALIGN(p, 4); |
| 208 | } while(1); |
| 209 | } |
| 210 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 211 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) |
| 212 | { |
| 213 | const char* cp; |
| 214 | unsigned long cplen, l; |
| 215 | |
| 216 | cp = of_get_flat_dt_prop(node, "compatible", &cplen); |
| 217 | if (cp == NULL) |
| 218 | return 0; |
| 219 | while (cplen > 0) { |
| 220 | if (strncasecmp(cp, compat, strlen(compat)) == 0) |
| 221 | return 1; |
| 222 | l = strlen(cp) + 1; |
| 223 | cp += l; |
| 224 | cplen -= l; |
| 225 | } |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 230 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
| 231 | unsigned long align) |
| 232 | { |
| 233 | void *res; |
| 234 | |
| 235 | *mem = _ALIGN(*mem, align); |
| 236 | res = (void *)*mem; |
| 237 | *mem += size; |
| 238 | |
| 239 | return res; |
| 240 | } |
| 241 | |
| 242 | static unsigned long __init unflatten_dt_node(unsigned long mem, |
| 243 | unsigned long *p, |
| 244 | struct device_node *dad, |
| 245 | struct device_node ***allnextpp, |
| 246 | unsigned long fpsize) |
| 247 | { |
| 248 | struct device_node *np; |
| 249 | struct property *pp, **prev_pp = NULL; |
| 250 | char *pathp; |
| 251 | u32 tag; |
| 252 | unsigned int l, allocl; |
| 253 | int has_name = 0; |
| 254 | int new_format = 0; |
| 255 | |
| 256 | tag = *((u32 *)(*p)); |
| 257 | if (tag != OF_DT_BEGIN_NODE) { |
| 258 | printk("Weird tag at start of node: %x\n", tag); |
| 259 | return mem; |
| 260 | } |
| 261 | *p += 4; |
| 262 | pathp = (char *)*p; |
| 263 | l = allocl = strlen(pathp) + 1; |
| 264 | *p = _ALIGN(*p + l, 4); |
| 265 | |
| 266 | /* version 0x10 has a more compact unit name here instead of the full |
| 267 | * path. we accumulate the full path size using "fpsize", we'll rebuild |
| 268 | * it later. We detect this because the first character of the name is |
| 269 | * not '/'. |
| 270 | */ |
| 271 | if ((*pathp) != '/') { |
| 272 | new_format = 1; |
| 273 | if (fpsize == 0) { |
| 274 | /* root node: special case. fpsize accounts for path |
| 275 | * plus terminating zero. root node only has '/', so |
| 276 | * fpsize should be 2, but we want to avoid the first |
| 277 | * level nodes to have two '/' so we use fpsize 1 here |
| 278 | */ |
| 279 | fpsize = 1; |
| 280 | allocl = 2; |
| 281 | } else { |
| 282 | /* account for '/' and path size minus terminal 0 |
| 283 | * already in 'l' |
| 284 | */ |
| 285 | fpsize += l; |
| 286 | allocl = fpsize; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | |
| 291 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, |
| 292 | __alignof__(struct device_node)); |
| 293 | if (allnextpp) { |
| 294 | memset(np, 0, sizeof(*np)); |
| 295 | np->full_name = ((char*)np) + sizeof(struct device_node); |
| 296 | if (new_format) { |
| 297 | char *p = np->full_name; |
| 298 | /* rebuild full path for new format */ |
| 299 | if (dad && dad->parent) { |
| 300 | strcpy(p, dad->full_name); |
| 301 | #ifdef DEBUG |
| 302 | if ((strlen(p) + l + 1) != allocl) { |
| 303 | DBG("%s: p: %d, l: %d, a: %d\n", |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 304 | pathp, (int)strlen(p), l, allocl); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 305 | } |
| 306 | #endif |
| 307 | p += strlen(p); |
| 308 | } |
| 309 | *(p++) = '/'; |
| 310 | memcpy(p, pathp, l); |
| 311 | } else |
| 312 | memcpy(np->full_name, pathp, l); |
| 313 | prev_pp = &np->properties; |
| 314 | **allnextpp = np; |
| 315 | *allnextpp = &np->allnext; |
| 316 | if (dad != NULL) { |
| 317 | np->parent = dad; |
| 318 | /* we temporarily use the next field as `last_child'*/ |
| 319 | if (dad->next == 0) |
| 320 | dad->child = np; |
| 321 | else |
| 322 | dad->next->sibling = np; |
| 323 | dad->next = np; |
| 324 | } |
| 325 | kref_init(&np->kref); |
| 326 | } |
| 327 | while(1) { |
| 328 | u32 sz, noff; |
| 329 | char *pname; |
| 330 | |
| 331 | tag = *((u32 *)(*p)); |
| 332 | if (tag == OF_DT_NOP) { |
| 333 | *p += 4; |
| 334 | continue; |
| 335 | } |
| 336 | if (tag != OF_DT_PROP) |
| 337 | break; |
| 338 | *p += 4; |
| 339 | sz = *((u32 *)(*p)); |
| 340 | noff = *((u32 *)((*p) + 4)); |
| 341 | *p += 8; |
| 342 | if (initial_boot_params->version < 0x10) |
| 343 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); |
| 344 | |
| 345 | pname = find_flat_dt_string(noff); |
| 346 | if (pname == NULL) { |
| 347 | printk("Can't find property name in list !\n"); |
| 348 | break; |
| 349 | } |
| 350 | if (strcmp(pname, "name") == 0) |
| 351 | has_name = 1; |
| 352 | l = strlen(pname) + 1; |
| 353 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
| 354 | __alignof__(struct property)); |
| 355 | if (allnextpp) { |
| 356 | if (strcmp(pname, "linux,phandle") == 0) { |
| 357 | np->node = *((u32 *)*p); |
| 358 | if (np->linux_phandle == 0) |
| 359 | np->linux_phandle = np->node; |
| 360 | } |
| 361 | if (strcmp(pname, "ibm,phandle") == 0) |
| 362 | np->linux_phandle = *((u32 *)*p); |
| 363 | pp->name = pname; |
| 364 | pp->length = sz; |
| 365 | pp->value = (void *)*p; |
| 366 | *prev_pp = pp; |
| 367 | prev_pp = &pp->next; |
| 368 | } |
| 369 | *p = _ALIGN((*p) + sz, 4); |
| 370 | } |
| 371 | /* with version 0x10 we may not have the name property, recreate |
| 372 | * it here from the unit name if absent |
| 373 | */ |
| 374 | if (!has_name) { |
| 375 | char *p = pathp, *ps = pathp, *pa = NULL; |
| 376 | int sz; |
| 377 | |
| 378 | while (*p) { |
| 379 | if ((*p) == '@') |
| 380 | pa = p; |
| 381 | if ((*p) == '/') |
| 382 | ps = p + 1; |
| 383 | p++; |
| 384 | } |
| 385 | if (pa < ps) |
| 386 | pa = p; |
| 387 | sz = (pa - ps) + 1; |
| 388 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, |
| 389 | __alignof__(struct property)); |
| 390 | if (allnextpp) { |
| 391 | pp->name = "name"; |
| 392 | pp->length = sz; |
Stephen Rothwell | 1a38147 | 2007-04-03 10:58:52 +1000 | [diff] [blame] | 393 | pp->value = pp + 1; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 394 | *prev_pp = pp; |
| 395 | prev_pp = &pp->next; |
| 396 | memcpy(pp->value, ps, sz - 1); |
| 397 | ((char *)pp->value)[sz - 1] = 0; |
Stephen Rothwell | 1a38147 | 2007-04-03 10:58:52 +1000 | [diff] [blame] | 398 | DBG("fixed up name for %s -> %s\n", pathp, |
| 399 | (char *)pp->value); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 400 | } |
| 401 | } |
| 402 | if (allnextpp) { |
| 403 | *prev_pp = NULL; |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 404 | np->name = of_get_property(np, "name", NULL); |
| 405 | np->type = of_get_property(np, "device_type", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 406 | |
| 407 | if (!np->name) |
| 408 | np->name = "<NULL>"; |
| 409 | if (!np->type) |
| 410 | np->type = "<NULL>"; |
| 411 | } |
| 412 | while (tag == OF_DT_BEGIN_NODE) { |
| 413 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); |
| 414 | tag = *((u32 *)(*p)); |
| 415 | } |
| 416 | if (tag != OF_DT_END_NODE) { |
| 417 | printk("Weird tag at end of node: %x\n", tag); |
| 418 | return mem; |
| 419 | } |
| 420 | *p += 4; |
| 421 | return mem; |
| 422 | } |
| 423 | |
Michael Ellerman | 2babf5c | 2006-05-17 18:00:46 +1000 | [diff] [blame] | 424 | static int __init early_parse_mem(char *p) |
| 425 | { |
| 426 | if (!p) |
| 427 | return 1; |
| 428 | |
| 429 | memory_limit = PAGE_ALIGN(memparse(p, &p)); |
| 430 | DBG("memory limit = 0x%lx\n", memory_limit); |
| 431 | |
| 432 | return 0; |
| 433 | } |
| 434 | early_param("mem", early_parse_mem); |
| 435 | |
| 436 | /* |
| 437 | * The device tree may be allocated below our memory limit, or inside the |
| 438 | * crash kernel region for kdump. If so, move it out now. |
| 439 | */ |
| 440 | static void move_device_tree(void) |
| 441 | { |
| 442 | unsigned long start, size; |
| 443 | void *p; |
| 444 | |
| 445 | DBG("-> move_device_tree\n"); |
| 446 | |
| 447 | start = __pa(initial_boot_params); |
| 448 | size = initial_boot_params->totalsize; |
| 449 | |
| 450 | if ((memory_limit && (start + size) > memory_limit) || |
| 451 | overlaps_crashkernel(start, size)) { |
| 452 | p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size)); |
| 453 | memcpy(p, initial_boot_params, size); |
| 454 | initial_boot_params = (struct boot_param_header *)p; |
| 455 | DBG("Moved device tree to 0x%p\n", p); |
| 456 | } |
| 457 | |
| 458 | DBG("<- move_device_tree\n"); |
| 459 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 460 | |
| 461 | /** |
| 462 | * unflattens the device-tree passed by the firmware, creating the |
| 463 | * tree of struct device_node. It also fills the "name" and "type" |
| 464 | * pointers of the nodes so the normal device-tree walking functions |
| 465 | * can be used (this used to be done by finish_device_tree) |
| 466 | */ |
| 467 | void __init unflatten_device_tree(void) |
| 468 | { |
| 469 | unsigned long start, mem, size; |
| 470 | struct device_node **allnextp = &allnodes; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 471 | |
| 472 | DBG(" -> unflatten_device_tree()\n"); |
| 473 | |
| 474 | /* First pass, scan for size */ |
| 475 | start = ((unsigned long)initial_boot_params) + |
| 476 | initial_boot_params->off_dt_struct; |
| 477 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); |
| 478 | size = (size | 3) + 1; |
| 479 | |
| 480 | DBG(" size is %lx, allocating...\n", size); |
| 481 | |
| 482 | /* Allocate memory for the expanded device tree */ |
| 483 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 484 | mem = (unsigned long) __va(mem); |
| 485 | |
| 486 | ((u32 *)mem)[size / 4] = 0xdeadbeef; |
| 487 | |
| 488 | DBG(" unflattening %lx...\n", mem); |
| 489 | |
| 490 | /* Second pass, do actual unflattening */ |
| 491 | start = ((unsigned long)initial_boot_params) + |
| 492 | initial_boot_params->off_dt_struct; |
| 493 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); |
| 494 | if (*((u32 *)start) != OF_DT_END) |
| 495 | printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); |
| 496 | if (((u32 *)mem)[size / 4] != 0xdeadbeef) |
| 497 | printk(KERN_WARNING "End of tree marker overwritten: %08x\n", |
| 498 | ((u32 *)mem)[size / 4] ); |
| 499 | *allnextp = NULL; |
| 500 | |
| 501 | /* Get pointer to OF "/chosen" node for use everywhere */ |
| 502 | of_chosen = of_find_node_by_path("/chosen"); |
Paul Mackerras | a575b80 | 2005-10-23 17:23:21 +1000 | [diff] [blame] | 503 | if (of_chosen == NULL) |
| 504 | of_chosen = of_find_node_by_path("/chosen@0"); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 505 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 506 | DBG(" <- unflatten_device_tree()\n"); |
| 507 | } |
| 508 | |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 509 | /* |
| 510 | * ibm,pa-features is a per-cpu property that contains a string of |
| 511 | * attribute descriptors, each of which has a 2 byte header plus up |
| 512 | * to 254 bytes worth of processor attribute bits. First header |
| 513 | * byte specifies the number of bytes following the header. |
| 514 | * Second header byte is an "attribute-specifier" type, of which |
| 515 | * zero is the only currently-defined value. |
| 516 | * Implementation: Pass in the byte and bit offset for the feature |
| 517 | * that we are interested in. The function will return -1 if the |
| 518 | * pa-features property is missing, or a 1/0 to indicate if the feature |
| 519 | * is supported/not supported. Note that the bit numbers are |
| 520 | * big-endian to match the definition in PAPR. |
| 521 | */ |
| 522 | static struct ibm_pa_feature { |
| 523 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ |
| 524 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
| 525 | unsigned char pabyte; /* byte number in ibm,pa-features */ |
| 526 | unsigned char pabit; /* bit number (big-endian) */ |
| 527 | unsigned char invert; /* if 1, pa bit set => clear feature */ |
| 528 | } ibm_pa_features[] __initdata = { |
| 529 | {0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, |
| 530 | {0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, |
| 531 | {CPU_FTR_SLB, 0, 0, 2, 0}, |
| 532 | {CPU_FTR_CTRL, 0, 0, 3, 0}, |
| 533 | {CPU_FTR_NOEXECUTE, 0, 0, 6, 0}, |
| 534 | {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1}, |
Paul Mackerras | bf72aeb | 2006-06-15 10:45:18 +1000 | [diff] [blame] | 535 | #if 0 |
| 536 | /* put this back once we know how to test if firmware does 64k IO */ |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 537 | {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, |
Paul Mackerras | bf72aeb | 2006-06-15 10:45:18 +1000 | [diff] [blame] | 538 | #endif |
Paul Mackerras | 339d76c | 2006-06-29 17:12:30 +1000 | [diff] [blame] | 539 | {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 540 | }; |
| 541 | |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 542 | static void __init scan_features(unsigned long node, unsigned char *ftrs, |
| 543 | unsigned long tablelen, |
| 544 | struct ibm_pa_feature *fp, |
| 545 | unsigned long ft_size) |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 546 | { |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 547 | unsigned long i, len, bit; |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 548 | |
| 549 | /* find descriptor with type == 0 */ |
| 550 | for (;;) { |
| 551 | if (tablelen < 3) |
| 552 | return; |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 553 | len = 2 + ftrs[0]; |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 554 | if (tablelen < len) |
| 555 | return; /* descriptor 0 not found */ |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 556 | if (ftrs[1] == 0) |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 557 | break; |
| 558 | tablelen -= len; |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 559 | ftrs += len; |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /* loop over bits we know about */ |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 563 | for (i = 0; i < ft_size; ++i, ++fp) { |
| 564 | if (fp->pabyte >= ftrs[0]) |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 565 | continue; |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 566 | bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 567 | if (bit ^ fp->invert) { |
| 568 | cur_cpu_spec->cpu_features |= fp->cpu_features; |
| 569 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; |
| 570 | } else { |
| 571 | cur_cpu_spec->cpu_features &= ~fp->cpu_features; |
| 572 | cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 577 | static void __init check_cpu_pa_features(unsigned long node) |
| 578 | { |
| 579 | unsigned char *pa_ftrs; |
| 580 | unsigned long tablelen; |
| 581 | |
| 582 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); |
| 583 | if (pa_ftrs == NULL) |
| 584 | return; |
| 585 | |
| 586 | scan_features(node, pa_ftrs, tablelen, |
| 587 | ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); |
| 588 | } |
| 589 | |
| 590 | static struct feature_property { |
| 591 | const char *name; |
| 592 | u32 min_value; |
| 593 | unsigned long cpu_feature; |
| 594 | unsigned long cpu_user_ftr; |
| 595 | } feature_properties[] __initdata = { |
| 596 | #ifdef CONFIG_ALTIVEC |
| 597 | {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
| 598 | {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
| 599 | #endif /* CONFIG_ALTIVEC */ |
| 600 | #ifdef CONFIG_PPC64 |
| 601 | {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, |
| 602 | {"ibm,purr", 1, CPU_FTR_PURR, 0}, |
| 603 | {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, |
| 604 | #endif /* CONFIG_PPC64 */ |
| 605 | }; |
| 606 | |
| 607 | static void __init check_cpu_feature_properties(unsigned long node) |
| 608 | { |
| 609 | unsigned long i; |
| 610 | struct feature_property *fp = feature_properties; |
| 611 | const u32 *prop; |
| 612 | |
| 613 | for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { |
| 614 | prop = of_get_flat_dt_prop(node, fp->name, NULL); |
| 615 | if (prop && *prop >= fp->min_value) { |
| 616 | cur_cpu_spec->cpu_features |= fp->cpu_feature; |
| 617 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; |
| 618 | } |
| 619 | } |
| 620 | } |
| 621 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 622 | static int __init early_init_dt_scan_cpus(unsigned long node, |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 623 | const char *uname, int depth, |
| 624 | void *data) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 625 | { |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 626 | static int logical_cpuid = 0; |
| 627 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 628 | const u32 *prop; |
| 629 | const u32 *intserv; |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 630 | int i, nthreads; |
| 631 | unsigned long len; |
| 632 | int found = 0; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 633 | |
| 634 | /* We are scanning "cpu" nodes only */ |
| 635 | if (type == NULL || strcmp(type, "cpu") != 0) |
| 636 | return 0; |
| 637 | |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 638 | /* Get physical cpuid */ |
| 639 | intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); |
| 640 | if (intserv) { |
| 641 | nthreads = len / sizeof(int); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 642 | } else { |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 643 | intserv = of_get_flat_dt_prop(node, "reg", NULL); |
| 644 | nthreads = 1; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 645 | } |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 646 | |
| 647 | /* |
| 648 | * Now see if any of these threads match our boot cpu. |
| 649 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. |
| 650 | */ |
| 651 | for (i = 0; i < nthreads; i++) { |
| 652 | /* |
| 653 | * version 2 of the kexec param format adds the phys cpuid of |
| 654 | * booted proc. |
| 655 | */ |
| 656 | if (initial_boot_params && initial_boot_params->version >= 2) { |
| 657 | if (intserv[i] == |
| 658 | initial_boot_params->boot_cpuid_phys) { |
| 659 | found = 1; |
| 660 | break; |
| 661 | } |
| 662 | } else { |
| 663 | /* |
| 664 | * Check if it's the boot-cpu, set it's hw index now, |
| 665 | * unfortunately this format did not support booting |
| 666 | * off secondary threads. |
| 667 | */ |
| 668 | if (of_get_flat_dt_prop(node, |
| 669 | "linux,boot-cpu", NULL) != NULL) { |
| 670 | found = 1; |
| 671 | break; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | #ifdef CONFIG_SMP |
| 676 | /* logical cpu id is always 0 on UP kernels */ |
| 677 | logical_cpuid++; |
| 678 | #endif |
| 679 | } |
| 680 | |
| 681 | if (found) { |
| 682 | DBG("boot cpu: logical %d physical %d\n", logical_cpuid, |
| 683 | intserv[i]); |
| 684 | boot_cpuid = logical_cpuid; |
| 685 | set_hard_smp_processor_id(boot_cpuid, intserv[i]); |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 686 | |
| 687 | /* |
| 688 | * PAPR defines "logical" PVR values for cpus that |
| 689 | * meet various levels of the architecture: |
| 690 | * 0x0f000001 Architecture version 2.04 |
| 691 | * 0x0f000002 Architecture version 2.05 |
| 692 | * If the cpu-version property in the cpu node contains |
| 693 | * such a value, we call identify_cpu again with the |
| 694 | * logical PVR value in order to use the cpu feature |
| 695 | * bits appropriate for the architecture level. |
| 696 | * |
| 697 | * A POWER6 partition in "POWER6 architected" mode |
| 698 | * uses the 0x0f000002 PVR value; in POWER5+ mode |
| 699 | * it uses 0x0f000001. |
| 700 | */ |
| 701 | prop = of_get_flat_dt_prop(node, "cpu-version", NULL); |
| 702 | if (prop && (*prop & 0xff000000) == 0x0f000000) |
| 703 | identify_cpu(0, *prop); |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 704 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 705 | |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 706 | check_cpu_feature_properties(node); |
Paul Mackerras | d205819 | 2006-05-03 23:04:37 +1000 | [diff] [blame] | 707 | check_cpu_pa_features(node); |
| 708 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 709 | #ifdef CONFIG_PPC_PSERIES |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 710 | if (nthreads > 1) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 711 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 712 | else |
| 713 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 714 | #endif |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
Michael Ellerman | 40472a5 | 2007-05-10 17:06:30 +1000 | [diff] [blame] | 719 | #ifdef CONFIG_BLK_DEV_INITRD |
| 720 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
| 721 | { |
| 722 | unsigned long l; |
| 723 | u32 *prop; |
| 724 | |
| 725 | DBG("Looking for initrd properties... "); |
| 726 | |
| 727 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l); |
| 728 | if (prop) { |
| 729 | initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4)); |
| 730 | |
| 731 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l); |
| 732 | if (prop) { |
| 733 | initrd_end = (unsigned long) |
| 734 | __va(of_read_ulong(prop, l/4)); |
| 735 | initrd_below_start_ok = 1; |
| 736 | } else { |
| 737 | initrd_start = 0; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start, initrd_end); |
| 742 | } |
| 743 | #else |
| 744 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
| 745 | { |
| 746 | } |
| 747 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 748 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 749 | static int __init early_init_dt_scan_chosen(unsigned long node, |
| 750 | const char *uname, int depth, void *data) |
| 751 | { |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 752 | unsigned long *lprop; |
Kumar Gala | 329dda0 | 2006-02-24 10:54:52 -0600 | [diff] [blame] | 753 | unsigned long l; |
| 754 | char *p; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 755 | |
| 756 | DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); |
| 757 | |
Paul Mackerras | a575b80 | 2005-10-23 17:23:21 +1000 | [diff] [blame] | 758 | if (depth != 1 || |
| 759 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 760 | return 0; |
| 761 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 762 | #ifdef CONFIG_PPC64 |
| 763 | /* check if iommu is forced on or off */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 764 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 765 | iommu_is_off = 1; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 766 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 767 | iommu_force_on = 1; |
| 768 | #endif |
| 769 | |
Michael Ellerman | 2babf5c | 2006-05-17 18:00:46 +1000 | [diff] [blame] | 770 | /* mem=x on the command line is the preferred mechanism */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 771 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 772 | if (lprop) |
| 773 | memory_limit = *lprop; |
| 774 | |
| 775 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 776 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 777 | if (lprop) |
| 778 | tce_alloc_start = *lprop; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 779 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 780 | if (lprop) |
| 781 | tce_alloc_end = *lprop; |
| 782 | #endif |
| 783 | |
Michael Ellerman | dcee303 | 2005-12-04 18:39:48 +1100 | [diff] [blame] | 784 | #ifdef CONFIG_KEXEC |
| 785 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
| 786 | if (lprop) |
| 787 | crashk_res.start = *lprop; |
| 788 | |
| 789 | lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
| 790 | if (lprop) |
| 791 | crashk_res.end = crashk_res.start + *lprop - 1; |
| 792 | #endif |
| 793 | |
Michael Ellerman | 40472a5 | 2007-05-10 17:06:30 +1000 | [diff] [blame] | 794 | early_init_dt_check_for_initrd(node); |
David Gibson | 30437b3 | 2007-02-28 14:12:29 +1100 | [diff] [blame] | 795 | |
Kumar Gala | 329dda0 | 2006-02-24 10:54:52 -0600 | [diff] [blame] | 796 | /* Retreive command line */ |
| 797 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
| 798 | if (p != NULL && l > 0) |
| 799 | strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); |
| 800 | |
| 801 | #ifdef CONFIG_CMDLINE |
Geoff Levand | c1ce464 | 2006-10-05 11:35:16 -0700 | [diff] [blame] | 802 | if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) |
Kumar Gala | 329dda0 | 2006-02-24 10:54:52 -0600 | [diff] [blame] | 803 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
| 804 | #endif /* CONFIG_CMDLINE */ |
| 805 | |
| 806 | DBG("Command line is: %s\n", cmd_line); |
| 807 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 808 | /* break now */ |
| 809 | return 1; |
| 810 | } |
| 811 | |
| 812 | static int __init early_init_dt_scan_root(unsigned long node, |
| 813 | const char *uname, int depth, void *data) |
| 814 | { |
| 815 | u32 *prop; |
| 816 | |
| 817 | if (depth != 0) |
| 818 | return 0; |
| 819 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 820 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 821 | dt_root_size_cells = (prop == NULL) ? 1 : *prop; |
| 822 | DBG("dt_root_size_cells = %x\n", dt_root_size_cells); |
| 823 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 824 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 825 | dt_root_addr_cells = (prop == NULL) ? 2 : *prop; |
| 826 | DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
| 827 | |
| 828 | /* break now */ |
| 829 | return 1; |
| 830 | } |
| 831 | |
| 832 | static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) |
| 833 | { |
| 834 | cell_t *p = *cellp; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 835 | |
Paul Mackerras | a4dc7ff | 2006-09-19 14:06:27 +1000 | [diff] [blame] | 836 | *cellp = p + s; |
| 837 | return of_read_ulong(p, s); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 838 | } |
| 839 | |
Paul Mackerras | 0204568 | 2006-11-29 22:27:42 +1100 | [diff] [blame] | 840 | #ifdef CONFIG_PPC_PSERIES |
| 841 | /* |
| 842 | * Interpret the ibm,dynamic-memory property in the |
| 843 | * /ibm,dynamic-reconfiguration-memory node. |
| 844 | * This contains a list of memory blocks along with NUMA affinity |
| 845 | * information. |
| 846 | */ |
| 847 | static int __init early_init_dt_scan_drconf_memory(unsigned long node) |
| 848 | { |
| 849 | cell_t *dm, *ls; |
| 850 | unsigned long l, n; |
| 851 | unsigned long base, size, lmb_size, flags; |
| 852 | |
| 853 | ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l); |
| 854 | if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t)) |
| 855 | return 0; |
| 856 | lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls); |
| 857 | |
| 858 | dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); |
| 859 | if (dm == NULL || l < sizeof(cell_t)) |
| 860 | return 0; |
| 861 | |
| 862 | n = *dm++; /* number of entries */ |
| 863 | if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t)) |
| 864 | return 0; |
| 865 | |
| 866 | for (; n != 0; --n) { |
| 867 | base = dt_mem_next_cell(dt_root_addr_cells, &dm); |
| 868 | flags = dm[3]; |
| 869 | /* skip DRC index, pad, assoc. list index, flags */ |
| 870 | dm += 4; |
| 871 | /* skip this block if the reserved bit is set in flags (0x80) |
| 872 | or if the block is not assigned to this partition (0x8) */ |
| 873 | if ((flags & 0x80) || !(flags & 0x8)) |
| 874 | continue; |
| 875 | size = lmb_size; |
| 876 | if (iommu_is_off) { |
| 877 | if (base >= 0x80000000ul) |
| 878 | continue; |
| 879 | if ((base + size) > 0x80000000ul) |
| 880 | size = 0x80000000ul - base; |
| 881 | } |
| 882 | lmb_add(base, size); |
| 883 | } |
| 884 | lmb_dump_all(); |
| 885 | return 0; |
| 886 | } |
| 887 | #else |
| 888 | #define early_init_dt_scan_drconf_memory(node) 0 |
| 889 | #endif /* CONFIG_PPC_PSERIES */ |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 890 | |
| 891 | static int __init early_init_dt_scan_memory(unsigned long node, |
| 892 | const char *uname, int depth, void *data) |
| 893 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 894 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 895 | cell_t *reg, *endp; |
| 896 | unsigned long l; |
| 897 | |
Paul Mackerras | 0204568 | 2006-11-29 22:27:42 +1100 | [diff] [blame] | 898 | /* Look for the ibm,dynamic-reconfiguration-memory node */ |
| 899 | if (depth == 1 && |
| 900 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) |
| 901 | return early_init_dt_scan_drconf_memory(node); |
| 902 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 903 | /* We are scanning "memory" nodes only */ |
Paul Mackerras | a23414b | 2005-11-10 12:00:55 +1100 | [diff] [blame] | 904 | if (type == NULL) { |
| 905 | /* |
| 906 | * The longtrail doesn't have a device_type on the |
| 907 | * /memory node, so look for the node called /memory@0. |
| 908 | */ |
| 909 | if (depth != 1 || strcmp(uname, "memory@0") != 0) |
| 910 | return 0; |
| 911 | } else if (strcmp(type, "memory") != 0) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 912 | return 0; |
| 913 | |
Michael Ellerman | ba75948 | 2005-12-04 18:39:55 +1100 | [diff] [blame] | 914 | reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
| 915 | if (reg == NULL) |
| 916 | reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 917 | if (reg == NULL) |
| 918 | return 0; |
| 919 | |
| 920 | endp = reg + (l / sizeof(cell_t)); |
| 921 | |
Michael Ellerman | 358c86f | 2005-11-03 15:39:09 +1100 | [diff] [blame] | 922 | DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 923 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
| 924 | |
| 925 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { |
| 926 | unsigned long base, size; |
| 927 | |
| 928 | base = dt_mem_next_cell(dt_root_addr_cells, ®); |
| 929 | size = dt_mem_next_cell(dt_root_size_cells, ®); |
| 930 | |
| 931 | if (size == 0) |
| 932 | continue; |
| 933 | DBG(" - %lx , %lx\n", base, size); |
| 934 | #ifdef CONFIG_PPC64 |
| 935 | if (iommu_is_off) { |
| 936 | if (base >= 0x80000000ul) |
| 937 | continue; |
| 938 | if ((base + size) > 0x80000000ul) |
| 939 | size = 0x80000000ul - base; |
| 940 | } |
| 941 | #endif |
| 942 | lmb_add(base, size); |
| 943 | } |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | static void __init early_reserve_mem(void) |
| 948 | { |
Kumar Gala | cbbcf34 | 2006-01-11 17:57:13 -0600 | [diff] [blame] | 949 | u64 base, size; |
| 950 | u64 *reserve_map; |
Jon Loeliger | 8a30088 | 2006-06-17 17:51:09 -0500 | [diff] [blame] | 951 | unsigned long self_base; |
| 952 | unsigned long self_size; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 953 | |
Kumar Gala | cbbcf34 | 2006-01-11 17:57:13 -0600 | [diff] [blame] | 954 | reserve_map = (u64 *)(((unsigned long)initial_boot_params) + |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 955 | initial_boot_params->off_mem_rsvmap); |
Jimi Xenidis | 4d1f3f2 | 2006-05-18 17:03:05 -0500 | [diff] [blame] | 956 | |
| 957 | /* before we do anything, lets reserve the dt blob */ |
Jon Loeliger | 8a30088 | 2006-06-17 17:51:09 -0500 | [diff] [blame] | 958 | self_base = __pa((unsigned long)initial_boot_params); |
| 959 | self_size = initial_boot_params->totalsize; |
| 960 | lmb_reserve(self_base, self_size); |
Jimi Xenidis | 4d1f3f2 | 2006-05-18 17:03:05 -0500 | [diff] [blame] | 961 | |
David Gibson | 30437b3 | 2007-02-28 14:12:29 +1100 | [diff] [blame] | 962 | #ifdef CONFIG_BLK_DEV_INITRD |
| 963 | /* then reserve the initrd, if any */ |
| 964 | if (initrd_start && (initrd_end > initrd_start)) |
| 965 | lmb_reserve(__pa(initrd_start), initrd_end - initrd_start); |
| 966 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 967 | |
Kumar Gala | cbbcf34 | 2006-01-11 17:57:13 -0600 | [diff] [blame] | 968 | #ifdef CONFIG_PPC32 |
| 969 | /* |
| 970 | * Handle the case where we might be booting from an old kexec |
| 971 | * image that setup the mem_rsvmap as pairs of 32-bit values |
| 972 | */ |
| 973 | if (*reserve_map > 0xffffffffull) { |
| 974 | u32 base_32, size_32; |
| 975 | u32 *reserve_map_32 = (u32 *)reserve_map; |
| 976 | |
| 977 | while (1) { |
| 978 | base_32 = *(reserve_map_32++); |
| 979 | size_32 = *(reserve_map_32++); |
| 980 | if (size_32 == 0) |
| 981 | break; |
Jon Loeliger | 8a30088 | 2006-06-17 17:51:09 -0500 | [diff] [blame] | 982 | /* skip if the reservation is for the blob */ |
| 983 | if (base_32 == self_base && size_32 == self_size) |
| 984 | continue; |
Kumar Gala | 329dda0 | 2006-02-24 10:54:52 -0600 | [diff] [blame] | 985 | DBG("reserving: %x -> %x\n", base_32, size_32); |
Kumar Gala | cbbcf34 | 2006-01-11 17:57:13 -0600 | [diff] [blame] | 986 | lmb_reserve(base_32, size_32); |
| 987 | } |
| 988 | return; |
| 989 | } |
| 990 | #endif |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 991 | while (1) { |
| 992 | base = *(reserve_map++); |
| 993 | size = *(reserve_map++); |
| 994 | if (size == 0) |
| 995 | break; |
Kumar Gala | cbbcf34 | 2006-01-11 17:57:13 -0600 | [diff] [blame] | 996 | DBG("reserving: %llx -> %llx\n", base, size); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 997 | lmb_reserve(base, size); |
| 998 | } |
| 999 | |
| 1000 | #if 0 |
| 1001 | DBG("memory reserved, lmbs :\n"); |
| 1002 | lmb_dump_all(); |
| 1003 | #endif |
| 1004 | } |
| 1005 | |
| 1006 | void __init early_init_devtree(void *params) |
| 1007 | { |
Geoff Levand | 4434810 | 2007-06-16 08:06:14 +1000 | [diff] [blame^] | 1008 | DBG(" -> early_init_devtree(%p)\n", params); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1009 | |
| 1010 | /* Setup flat device-tree pointer */ |
| 1011 | initial_boot_params = params; |
| 1012 | |
Michael Ellerman | 458148c | 2006-06-23 18:20:13 +1000 | [diff] [blame] | 1013 | #ifdef CONFIG_PPC_RTAS |
| 1014 | /* Some machines might need RTAS info for debugging, grab it now. */ |
| 1015 | of_scan_flat_dt(early_init_dt_scan_rtas, NULL); |
| 1016 | #endif |
| 1017 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1018 | /* Retrieve various informations from the /chosen node of the |
| 1019 | * device-tree, including the platform type, initrd location and |
| 1020 | * size, TCE reserve, and more ... |
| 1021 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1022 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1023 | |
| 1024 | /* Scan memory nodes and rebuild LMBs */ |
| 1025 | lmb_init(); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1026 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
| 1027 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); |
Michael Ellerman | 846f77b | 2006-05-17 18:00:45 +1000 | [diff] [blame] | 1028 | |
| 1029 | /* Save command line for /proc/cmdline and then parse parameters */ |
Alon Bar-Lev | b8757b2 | 2007-02-12 00:54:17 -0800 | [diff] [blame] | 1030 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); |
Michael Ellerman | 846f77b | 2006-05-17 18:00:45 +1000 | [diff] [blame] | 1031 | parse_early_param(); |
| 1032 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1033 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 1034 | lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); |
Michael Ellerman | 4731041 | 2006-05-17 18:00:49 +1000 | [diff] [blame] | 1035 | reserve_kdump_trampoline(); |
Michael Ellerman | 35dd543 | 2006-05-18 11:16:11 +1000 | [diff] [blame] | 1036 | reserve_crashkernel(); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1037 | early_reserve_mem(); |
| 1038 | |
Michael Ellerman | 2babf5c | 2006-05-17 18:00:46 +1000 | [diff] [blame] | 1039 | lmb_enforce_memory_limit(memory_limit); |
| 1040 | lmb_analyze(); |
| 1041 | |
| 1042 | DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); |
| 1043 | |
| 1044 | /* We may need to relocate the flat tree, do it now. |
| 1045 | * FIXME .. and the initrd too? */ |
| 1046 | move_device_tree(); |
| 1047 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1048 | DBG("Scanning CPUs ...\n"); |
| 1049 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1050 | /* Retreive CPU related informations from the flat tree |
| 1051 | * (altivec support, boot CPU ID, ...) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1052 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1053 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1054 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1055 | DBG(" <- early_init_devtree()\n"); |
| 1056 | } |
| 1057 | |
| 1058 | #undef printk |
| 1059 | |
Stephen Rothwell | a8bda5d | 2007-04-03 10:56:50 +1000 | [diff] [blame] | 1060 | int of_n_addr_cells(struct device_node* np) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1061 | { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1062 | const int *ip; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1063 | do { |
| 1064 | if (np->parent) |
| 1065 | np = np->parent; |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1066 | ip = of_get_property(np, "#address-cells", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1067 | if (ip != NULL) |
| 1068 | return *ip; |
| 1069 | } while (np->parent); |
| 1070 | /* No #address-cells property for the root node, default to 1 */ |
| 1071 | return 1; |
| 1072 | } |
Stephen Rothwell | a8bda5d | 2007-04-03 10:56:50 +1000 | [diff] [blame] | 1073 | EXPORT_SYMBOL(of_n_addr_cells); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1074 | |
Stephen Rothwell | 9213fee | 2007-04-03 10:57:48 +1000 | [diff] [blame] | 1075 | int of_n_size_cells(struct device_node* np) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1076 | { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1077 | const int* ip; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1078 | do { |
| 1079 | if (np->parent) |
| 1080 | np = np->parent; |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1081 | ip = of_get_property(np, "#size-cells", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1082 | if (ip != NULL) |
| 1083 | return *ip; |
| 1084 | } while (np->parent); |
| 1085 | /* No #size-cells property for the root node, default to 1 */ |
| 1086 | return 1; |
| 1087 | } |
Stephen Rothwell | 9213fee | 2007-04-03 10:57:48 +1000 | [diff] [blame] | 1088 | EXPORT_SYMBOL(of_n_size_cells); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1089 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1090 | /** Checks if the given "compat" string matches one of the strings in |
| 1091 | * the device's "compatible" property |
| 1092 | */ |
Stephen Rothwell | 7a92f74 | 2007-04-03 10:55:39 +1000 | [diff] [blame] | 1093 | int of_device_is_compatible(const struct device_node *device, |
| 1094 | const char *compat) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1095 | { |
| 1096 | const char* cp; |
| 1097 | int cplen, l; |
| 1098 | |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1099 | cp = of_get_property(device, "compatible", &cplen); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1100 | if (cp == NULL) |
| 1101 | return 0; |
| 1102 | while (cplen > 0) { |
| 1103 | if (strncasecmp(cp, compat, strlen(compat)) == 0) |
| 1104 | return 1; |
| 1105 | l = strlen(cp) + 1; |
| 1106 | cp += l; |
| 1107 | cplen -= l; |
| 1108 | } |
| 1109 | |
| 1110 | return 0; |
| 1111 | } |
Stephen Rothwell | 7a92f74 | 2007-04-03 10:55:39 +1000 | [diff] [blame] | 1112 | EXPORT_SYMBOL(of_device_is_compatible); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1113 | |
| 1114 | |
| 1115 | /** |
| 1116 | * Indicates whether the root node has a given value in its |
| 1117 | * compatible property. |
| 1118 | */ |
| 1119 | int machine_is_compatible(const char *compat) |
| 1120 | { |
| 1121 | struct device_node *root; |
| 1122 | int rc = 0; |
| 1123 | |
| 1124 | root = of_find_node_by_path("/"); |
| 1125 | if (root) { |
Stephen Rothwell | 7a92f74 | 2007-04-03 10:55:39 +1000 | [diff] [blame] | 1126 | rc = of_device_is_compatible(root, compat); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1127 | of_node_put(root); |
| 1128 | } |
| 1129 | return rc; |
| 1130 | } |
| 1131 | EXPORT_SYMBOL(machine_is_compatible); |
| 1132 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1133 | /******* |
| 1134 | * |
| 1135 | * New implementation of the OF "find" APIs, return a refcounted |
| 1136 | * object, call of_node_put() when done. The device tree and list |
| 1137 | * are protected by a rw_lock. |
| 1138 | * |
| 1139 | * Note that property management will need some locking as well, |
| 1140 | * this isn't dealt with yet. |
| 1141 | * |
| 1142 | *******/ |
| 1143 | |
| 1144 | /** |
| 1145 | * of_find_node_by_name - Find a node by its "name" property |
| 1146 | * @from: The node to start searching from or NULL, the node |
| 1147 | * you pass will not be searched, only the next one |
| 1148 | * will; typically, you pass what the previous call |
| 1149 | * returned. of_node_put() will be called on it |
| 1150 | * @name: The name string to match against |
| 1151 | * |
| 1152 | * Returns a node pointer with refcount incremented, use |
| 1153 | * of_node_put() on it when done. |
| 1154 | */ |
| 1155 | struct device_node *of_find_node_by_name(struct device_node *from, |
| 1156 | const char *name) |
| 1157 | { |
| 1158 | struct device_node *np; |
| 1159 | |
| 1160 | read_lock(&devtree_lock); |
| 1161 | np = from ? from->allnext : allnodes; |
Olaf Hering | 090db7c | 2006-02-04 12:44:56 +0100 | [diff] [blame] | 1162 | for (; np != NULL; np = np->allnext) |
| 1163 | if (np->name != NULL && strcasecmp(np->name, name) == 0 |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1164 | && of_node_get(np)) |
| 1165 | break; |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1166 | of_node_put(from); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1167 | read_unlock(&devtree_lock); |
| 1168 | return np; |
| 1169 | } |
| 1170 | EXPORT_SYMBOL(of_find_node_by_name); |
| 1171 | |
| 1172 | /** |
| 1173 | * of_find_node_by_type - Find a node by its "device_type" property |
Michael Ellerman | 5169b8a | 2007-05-23 18:08:13 +1000 | [diff] [blame] | 1174 | * @from: The node to start searching from, or NULL to start searching |
| 1175 | * the entire device tree. The node you pass will not be |
| 1176 | * searched, only the next one will; typically, you pass |
| 1177 | * what the previous call returned. of_node_put() will be |
| 1178 | * called on from for you. |
| 1179 | * @type: The type string to match against |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1180 | * |
| 1181 | * Returns a node pointer with refcount incremented, use |
| 1182 | * of_node_put() on it when done. |
| 1183 | */ |
| 1184 | struct device_node *of_find_node_by_type(struct device_node *from, |
| 1185 | const char *type) |
| 1186 | { |
| 1187 | struct device_node *np; |
| 1188 | |
| 1189 | read_lock(&devtree_lock); |
| 1190 | np = from ? from->allnext : allnodes; |
| 1191 | for (; np != 0; np = np->allnext) |
| 1192 | if (np->type != 0 && strcasecmp(np->type, type) == 0 |
| 1193 | && of_node_get(np)) |
| 1194 | break; |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1195 | of_node_put(from); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1196 | read_unlock(&devtree_lock); |
| 1197 | return np; |
| 1198 | } |
| 1199 | EXPORT_SYMBOL(of_find_node_by_type); |
| 1200 | |
| 1201 | /** |
| 1202 | * of_find_compatible_node - Find a node based on type and one of the |
| 1203 | * tokens in its "compatible" property |
| 1204 | * @from: The node to start searching from or NULL, the node |
| 1205 | * you pass will not be searched, only the next one |
| 1206 | * will; typically, you pass what the previous call |
| 1207 | * returned. of_node_put() will be called on it |
| 1208 | * @type: The type string to match "device_type" or NULL to ignore |
| 1209 | * @compatible: The string to match to one of the tokens in the device |
| 1210 | * "compatible" list. |
| 1211 | * |
| 1212 | * Returns a node pointer with refcount incremented, use |
| 1213 | * of_node_put() on it when done. |
| 1214 | */ |
| 1215 | struct device_node *of_find_compatible_node(struct device_node *from, |
| 1216 | const char *type, const char *compatible) |
| 1217 | { |
| 1218 | struct device_node *np; |
| 1219 | |
| 1220 | read_lock(&devtree_lock); |
| 1221 | np = from ? from->allnext : allnodes; |
| 1222 | for (; np != 0; np = np->allnext) { |
| 1223 | if (type != NULL |
| 1224 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) |
| 1225 | continue; |
Stephen Rothwell | 7a92f74 | 2007-04-03 10:55:39 +1000 | [diff] [blame] | 1226 | if (of_device_is_compatible(np, compatible) && of_node_get(np)) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1227 | break; |
| 1228 | } |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1229 | of_node_put(from); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1230 | read_unlock(&devtree_lock); |
| 1231 | return np; |
| 1232 | } |
| 1233 | EXPORT_SYMBOL(of_find_compatible_node); |
| 1234 | |
| 1235 | /** |
| 1236 | * of_find_node_by_path - Find a node matching a full OF path |
| 1237 | * @path: The full path to match |
| 1238 | * |
| 1239 | * Returns a node pointer with refcount incremented, use |
| 1240 | * of_node_put() on it when done. |
| 1241 | */ |
| 1242 | struct device_node *of_find_node_by_path(const char *path) |
| 1243 | { |
| 1244 | struct device_node *np = allnodes; |
| 1245 | |
| 1246 | read_lock(&devtree_lock); |
| 1247 | for (; np != 0; np = np->allnext) { |
| 1248 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0 |
| 1249 | && of_node_get(np)) |
| 1250 | break; |
| 1251 | } |
| 1252 | read_unlock(&devtree_lock); |
| 1253 | return np; |
| 1254 | } |
| 1255 | EXPORT_SYMBOL(of_find_node_by_path); |
| 1256 | |
| 1257 | /** |
| 1258 | * of_find_node_by_phandle - Find a node given a phandle |
| 1259 | * @handle: phandle of the node to find |
| 1260 | * |
| 1261 | * Returns a node pointer with refcount incremented, use |
| 1262 | * of_node_put() on it when done. |
| 1263 | */ |
| 1264 | struct device_node *of_find_node_by_phandle(phandle handle) |
| 1265 | { |
| 1266 | struct device_node *np; |
| 1267 | |
| 1268 | read_lock(&devtree_lock); |
| 1269 | for (np = allnodes; np != 0; np = np->allnext) |
| 1270 | if (np->linux_phandle == handle) |
| 1271 | break; |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1272 | of_node_get(np); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1273 | read_unlock(&devtree_lock); |
| 1274 | return np; |
| 1275 | } |
| 1276 | EXPORT_SYMBOL(of_find_node_by_phandle); |
| 1277 | |
| 1278 | /** |
| 1279 | * of_find_all_nodes - Get next node in global list |
| 1280 | * @prev: Previous node or NULL to start iteration |
| 1281 | * of_node_put() will be called on it |
| 1282 | * |
| 1283 | * Returns a node pointer with refcount incremented, use |
| 1284 | * of_node_put() on it when done. |
| 1285 | */ |
| 1286 | struct device_node *of_find_all_nodes(struct device_node *prev) |
| 1287 | { |
| 1288 | struct device_node *np; |
| 1289 | |
| 1290 | read_lock(&devtree_lock); |
| 1291 | np = prev ? prev->allnext : allnodes; |
| 1292 | for (; np != 0; np = np->allnext) |
| 1293 | if (of_node_get(np)) |
| 1294 | break; |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1295 | of_node_put(prev); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1296 | read_unlock(&devtree_lock); |
| 1297 | return np; |
| 1298 | } |
| 1299 | EXPORT_SYMBOL(of_find_all_nodes); |
| 1300 | |
| 1301 | /** |
| 1302 | * of_get_parent - Get a node's parent if any |
| 1303 | * @node: Node to get parent |
| 1304 | * |
| 1305 | * Returns a node pointer with refcount incremented, use |
| 1306 | * of_node_put() on it when done. |
| 1307 | */ |
| 1308 | struct device_node *of_get_parent(const struct device_node *node) |
| 1309 | { |
| 1310 | struct device_node *np; |
| 1311 | |
| 1312 | if (!node) |
| 1313 | return NULL; |
| 1314 | |
| 1315 | read_lock(&devtree_lock); |
| 1316 | np = of_node_get(node->parent); |
| 1317 | read_unlock(&devtree_lock); |
| 1318 | return np; |
| 1319 | } |
| 1320 | EXPORT_SYMBOL(of_get_parent); |
| 1321 | |
| 1322 | /** |
| 1323 | * of_get_next_child - Iterate a node childs |
| 1324 | * @node: parent node |
| 1325 | * @prev: previous child of the parent node, or NULL to get first |
| 1326 | * |
| 1327 | * Returns a node pointer with refcount incremented, use |
| 1328 | * of_node_put() on it when done. |
| 1329 | */ |
| 1330 | struct device_node *of_get_next_child(const struct device_node *node, |
| 1331 | struct device_node *prev) |
| 1332 | { |
| 1333 | struct device_node *next; |
| 1334 | |
| 1335 | read_lock(&devtree_lock); |
| 1336 | next = prev ? prev->sibling : node->child; |
| 1337 | for (; next != 0; next = next->sibling) |
| 1338 | if (of_node_get(next)) |
| 1339 | break; |
Mariusz Kozlowski | b1374051 | 2007-01-02 12:31:47 +0100 | [diff] [blame] | 1340 | of_node_put(prev); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1341 | read_unlock(&devtree_lock); |
| 1342 | return next; |
| 1343 | } |
| 1344 | EXPORT_SYMBOL(of_get_next_child); |
| 1345 | |
| 1346 | /** |
| 1347 | * of_node_get - Increment refcount of a node |
| 1348 | * @node: Node to inc refcount, NULL is supported to |
| 1349 | * simplify writing of callers |
| 1350 | * |
| 1351 | * Returns node. |
| 1352 | */ |
| 1353 | struct device_node *of_node_get(struct device_node *node) |
| 1354 | { |
| 1355 | if (node) |
| 1356 | kref_get(&node->kref); |
| 1357 | return node; |
| 1358 | } |
| 1359 | EXPORT_SYMBOL(of_node_get); |
| 1360 | |
| 1361 | static inline struct device_node * kref_to_device_node(struct kref *kref) |
| 1362 | { |
| 1363 | return container_of(kref, struct device_node, kref); |
| 1364 | } |
| 1365 | |
| 1366 | /** |
| 1367 | * of_node_release - release a dynamically allocated node |
| 1368 | * @kref: kref element of the node to be released |
| 1369 | * |
| 1370 | * In of_node_put() this function is passed to kref_put() |
| 1371 | * as the destructor. |
| 1372 | */ |
| 1373 | static void of_node_release(struct kref *kref) |
| 1374 | { |
| 1375 | struct device_node *node = kref_to_device_node(kref); |
| 1376 | struct property *prop = node->properties; |
| 1377 | |
| 1378 | if (!OF_IS_DYNAMIC(node)) |
| 1379 | return; |
| 1380 | while (prop) { |
| 1381 | struct property *next = prop->next; |
| 1382 | kfree(prop->name); |
| 1383 | kfree(prop->value); |
| 1384 | kfree(prop); |
| 1385 | prop = next; |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1386 | |
| 1387 | if (!prop) { |
| 1388 | prop = node->deadprops; |
| 1389 | node->deadprops = NULL; |
| 1390 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1391 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1392 | kfree(node->full_name); |
| 1393 | kfree(node->data); |
| 1394 | kfree(node); |
| 1395 | } |
| 1396 | |
| 1397 | /** |
| 1398 | * of_node_put - Decrement refcount of a node |
| 1399 | * @node: Node to dec refcount, NULL is supported to |
| 1400 | * simplify writing of callers |
| 1401 | * |
| 1402 | */ |
| 1403 | void of_node_put(struct device_node *node) |
| 1404 | { |
| 1405 | if (node) |
| 1406 | kref_put(&node->kref, of_node_release); |
| 1407 | } |
| 1408 | EXPORT_SYMBOL(of_node_put); |
| 1409 | |
| 1410 | /* |
| 1411 | * Plug a device node into the tree and global list. |
| 1412 | */ |
| 1413 | void of_attach_node(struct device_node *np) |
| 1414 | { |
| 1415 | write_lock(&devtree_lock); |
| 1416 | np->sibling = np->parent->child; |
| 1417 | np->allnext = allnodes; |
| 1418 | np->parent->child = np; |
| 1419 | allnodes = np; |
| 1420 | write_unlock(&devtree_lock); |
| 1421 | } |
| 1422 | |
| 1423 | /* |
| 1424 | * "Unplug" a node from the device tree. The caller must hold |
| 1425 | * a reference to the node. The memory associated with the node |
| 1426 | * is not freed until its refcount goes to zero. |
| 1427 | */ |
| 1428 | void of_detach_node(const struct device_node *np) |
| 1429 | { |
| 1430 | struct device_node *parent; |
| 1431 | |
| 1432 | write_lock(&devtree_lock); |
| 1433 | |
| 1434 | parent = np->parent; |
| 1435 | |
| 1436 | if (allnodes == np) |
| 1437 | allnodes = np->allnext; |
| 1438 | else { |
| 1439 | struct device_node *prev; |
| 1440 | for (prev = allnodes; |
| 1441 | prev->allnext != np; |
| 1442 | prev = prev->allnext) |
| 1443 | ; |
| 1444 | prev->allnext = np->allnext; |
| 1445 | } |
| 1446 | |
| 1447 | if (parent->child == np) |
| 1448 | parent->child = np->sibling; |
| 1449 | else { |
| 1450 | struct device_node *prevsib; |
| 1451 | for (prevsib = np->parent->child; |
| 1452 | prevsib->sibling != np; |
| 1453 | prevsib = prevsib->sibling) |
| 1454 | ; |
| 1455 | prevsib->sibling = np->sibling; |
| 1456 | } |
| 1457 | |
| 1458 | write_unlock(&devtree_lock); |
| 1459 | } |
| 1460 | |
| 1461 | #ifdef CONFIG_PPC_PSERIES |
| 1462 | /* |
| 1463 | * Fix up the uninitialized fields in a new device node: |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1464 | * name, type and pci-specific fields |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1465 | */ |
| 1466 | |
Benjamin Herrenschmidt | cc5d018 | 2005-12-13 18:01:21 +1100 | [diff] [blame] | 1467 | static int of_finish_dynamic_node(struct device_node *node) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1468 | { |
| 1469 | struct device_node *parent = of_get_parent(node); |
| 1470 | int err = 0; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1471 | const phandle *ibm_phandle; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1472 | |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1473 | node->name = of_get_property(node, "name", NULL); |
| 1474 | node->type = of_get_property(node, "device_type", NULL); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1475 | |
Benjamin Herrenschmidt | 847f597 | 2007-05-16 16:57:24 +1000 | [diff] [blame] | 1476 | if (!node->name) |
| 1477 | node->name = "<NULL>"; |
| 1478 | if (!node->type) |
| 1479 | node->type = "<NULL>"; |
| 1480 | |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1481 | if (!parent) { |
| 1482 | err = -ENODEV; |
| 1483 | goto out; |
| 1484 | } |
| 1485 | |
| 1486 | /* We don't support that function on PowerMac, at least |
| 1487 | * not yet |
| 1488 | */ |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 1489 | if (machine_is(powermac)) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1490 | return -ENODEV; |
| 1491 | |
| 1492 | /* fix up new node's linux_phandle field */ |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1493 | if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL))) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1494 | node->linux_phandle = *ibm_phandle; |
| 1495 | |
| 1496 | out: |
| 1497 | of_node_put(parent); |
| 1498 | return err; |
| 1499 | } |
| 1500 | |
| 1501 | static int prom_reconfig_notifier(struct notifier_block *nb, |
| 1502 | unsigned long action, void *node) |
| 1503 | { |
| 1504 | int err; |
| 1505 | |
| 1506 | switch (action) { |
| 1507 | case PSERIES_RECONFIG_ADD: |
Benjamin Herrenschmidt | cc5d018 | 2005-12-13 18:01:21 +1100 | [diff] [blame] | 1508 | err = of_finish_dynamic_node(node); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1509 | if (err < 0) { |
| 1510 | printk(KERN_ERR "finish_node returned %d\n", err); |
| 1511 | err = NOTIFY_BAD; |
| 1512 | } |
| 1513 | break; |
| 1514 | default: |
| 1515 | err = NOTIFY_DONE; |
| 1516 | break; |
| 1517 | } |
| 1518 | return err; |
| 1519 | } |
| 1520 | |
| 1521 | static struct notifier_block prom_reconfig_nb = { |
| 1522 | .notifier_call = prom_reconfig_notifier, |
| 1523 | .priority = 10, /* This one needs to run first */ |
| 1524 | }; |
| 1525 | |
| 1526 | static int __init prom_reconfig_setup(void) |
| 1527 | { |
| 1528 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); |
| 1529 | } |
| 1530 | __initcall(prom_reconfig_setup); |
| 1531 | #endif |
| 1532 | |
Benjamin Herrenschmidt | e2100ef | 2006-10-20 11:49:54 +1000 | [diff] [blame] | 1533 | struct property *of_find_property(const struct device_node *np, |
| 1534 | const char *name, |
Dave C Boutcher | ecaa8b0 | 2006-01-12 16:09:29 -0600 | [diff] [blame] | 1535 | int *lenp) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1536 | { |
| 1537 | struct property *pp; |
| 1538 | |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1539 | read_lock(&devtree_lock); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1540 | for (pp = np->properties; pp != 0; pp = pp->next) |
| 1541 | if (strcmp(pp->name, name) == 0) { |
| 1542 | if (lenp != 0) |
| 1543 | *lenp = pp->length; |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1544 | break; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1545 | } |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1546 | read_unlock(&devtree_lock); |
| 1547 | |
Dave C Boutcher | ecaa8b0 | 2006-01-12 16:09:29 -0600 | [diff] [blame] | 1548 | return pp; |
| 1549 | } |
Dave Jones | ae50517 | 2007-02-14 16:54:31 -0500 | [diff] [blame] | 1550 | EXPORT_SYMBOL(of_find_property); |
Dave C Boutcher | ecaa8b0 | 2006-01-12 16:09:29 -0600 | [diff] [blame] | 1551 | |
| 1552 | /* |
| 1553 | * Find a property with a given name for a given node |
| 1554 | * and return the value. |
| 1555 | */ |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1556 | const void *of_get_property(const struct device_node *np, const char *name, |
Benjamin Herrenschmidt | e2100ef | 2006-10-20 11:49:54 +1000 | [diff] [blame] | 1557 | int *lenp) |
Dave C Boutcher | ecaa8b0 | 2006-01-12 16:09:29 -0600 | [diff] [blame] | 1558 | { |
| 1559 | struct property *pp = of_find_property(np,name,lenp); |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1560 | return pp ? pp->value : NULL; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1561 | } |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1562 | EXPORT_SYMBOL(of_get_property); |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1563 | |
| 1564 | /* |
| 1565 | * Add a property to a node |
| 1566 | */ |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1567 | int prom_add_property(struct device_node* np, struct property* prop) |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1568 | { |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1569 | struct property **next; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1570 | |
| 1571 | prop->next = NULL; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1572 | write_lock(&devtree_lock); |
| 1573 | next = &np->properties; |
| 1574 | while (*next) { |
| 1575 | if (strcmp(prop->name, (*next)->name) == 0) { |
| 1576 | /* duplicate ! don't insert it */ |
| 1577 | write_unlock(&devtree_lock); |
| 1578 | return -1; |
| 1579 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1580 | next = &(*next)->next; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1581 | } |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1582 | *next = prop; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1583 | write_unlock(&devtree_lock); |
| 1584 | |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 1585 | #ifdef CONFIG_PROC_DEVICETREE |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1586 | /* try to add to proc as well if it was initialized */ |
| 1587 | if (np->pde) |
| 1588 | proc_device_tree_add_prop(np->pde, prop); |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 1589 | #endif /* CONFIG_PROC_DEVICETREE */ |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1590 | |
| 1591 | return 0; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1592 | } |
| 1593 | |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1594 | /* |
| 1595 | * Remove a property from a node. Note that we don't actually |
| 1596 | * remove it, since we have given out who-knows-how-many pointers |
| 1597 | * to the data using get-property. Instead we just move the property |
| 1598 | * to the "dead properties" list, so it won't be found any more. |
| 1599 | */ |
| 1600 | int prom_remove_property(struct device_node *np, struct property *prop) |
| 1601 | { |
| 1602 | struct property **next; |
| 1603 | int found = 0; |
Paul Mackerras | 9b6b563 | 2005-10-06 12:06:20 +1000 | [diff] [blame] | 1604 | |
Dave C Boutcher | 088186d | 2006-01-12 16:08:27 -0600 | [diff] [blame] | 1605 | write_lock(&devtree_lock); |
| 1606 | next = &np->properties; |
| 1607 | while (*next) { |
| 1608 | if (*next == prop) { |
| 1609 | /* found the node */ |
| 1610 | *next = prop->next; |
| 1611 | prop->next = np->deadprops; |
| 1612 | np->deadprops = prop; |
| 1613 | found = 1; |
| 1614 | break; |
| 1615 | } |
| 1616 | next = &(*next)->next; |
| 1617 | } |
| 1618 | write_unlock(&devtree_lock); |
| 1619 | |
| 1620 | if (!found) |
| 1621 | return -ENODEV; |
| 1622 | |
| 1623 | #ifdef CONFIG_PROC_DEVICETREE |
| 1624 | /* try to remove the proc node as well */ |
| 1625 | if (np->pde) |
| 1626 | proc_device_tree_remove_prop(np->pde, prop); |
| 1627 | #endif /* CONFIG_PROC_DEVICETREE */ |
| 1628 | |
| 1629 | return 0; |
| 1630 | } |
| 1631 | |
| 1632 | /* |
| 1633 | * Update a property in a node. Note that we don't actually |
| 1634 | * remove it, since we have given out who-knows-how-many pointers |
| 1635 | * to the data using get-property. Instead we just move the property |
| 1636 | * to the "dead properties" list, and add the new property to the |
| 1637 | * property list |
| 1638 | */ |
| 1639 | int prom_update_property(struct device_node *np, |
| 1640 | struct property *newprop, |
| 1641 | struct property *oldprop) |
| 1642 | { |
| 1643 | struct property **next; |
| 1644 | int found = 0; |
| 1645 | |
| 1646 | write_lock(&devtree_lock); |
| 1647 | next = &np->properties; |
| 1648 | while (*next) { |
| 1649 | if (*next == oldprop) { |
| 1650 | /* found the node */ |
| 1651 | newprop->next = oldprop->next; |
| 1652 | *next = newprop; |
| 1653 | oldprop->next = np->deadprops; |
| 1654 | np->deadprops = oldprop; |
| 1655 | found = 1; |
| 1656 | break; |
| 1657 | } |
| 1658 | next = &(*next)->next; |
| 1659 | } |
| 1660 | write_unlock(&devtree_lock); |
| 1661 | |
| 1662 | if (!found) |
| 1663 | return -ENODEV; |
| 1664 | |
| 1665 | #ifdef CONFIG_PROC_DEVICETREE |
| 1666 | /* try to add to proc as well if it was initialized */ |
| 1667 | if (np->pde) |
| 1668 | proc_device_tree_update_prop(np->pde, newprop, oldprop); |
| 1669 | #endif /* CONFIG_PROC_DEVICETREE */ |
| 1670 | |
| 1671 | return 0; |
| 1672 | } |
Michael Ellerman | b68239e | 2006-02-03 19:05:47 +1100 | [diff] [blame] | 1673 | |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 1674 | |
| 1675 | /* Find the device node for a given logical cpu number, also returns the cpu |
| 1676 | * local thread number (index in ibm,interrupt-server#s) if relevant and |
| 1677 | * asked for (non NULL) |
| 1678 | */ |
| 1679 | struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) |
| 1680 | { |
| 1681 | int hardid; |
| 1682 | struct device_node *np; |
| 1683 | |
| 1684 | hardid = get_hard_smp_processor_id(cpu); |
| 1685 | |
| 1686 | for_each_node_by_type(np, "cpu") { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1687 | const u32 *intserv; |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 1688 | unsigned int plen, t; |
| 1689 | |
| 1690 | /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist |
| 1691 | * fallback to "reg" property and assume no threads |
| 1692 | */ |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1693 | intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1694 | &plen); |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 1695 | if (intserv == NULL) { |
Stephen Rothwell | 0e56efc | 2007-04-03 10:54:01 +1000 | [diff] [blame] | 1696 | const u32 *reg = of_get_property(np, "reg", NULL); |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 1697 | if (reg == NULL) |
| 1698 | continue; |
| 1699 | if (*reg == hardid) { |
| 1700 | if (thread) |
| 1701 | *thread = 0; |
| 1702 | return np; |
| 1703 | } |
| 1704 | } else { |
| 1705 | plen /= sizeof(u32); |
| 1706 | for (t = 0; t < plen; t++) { |
| 1707 | if (hardid == intserv[t]) { |
| 1708 | if (thread) |
| 1709 | *thread = t; |
| 1710 | return np; |
| 1711 | } |
| 1712 | } |
| 1713 | } |
| 1714 | } |
| 1715 | return NULL; |
| 1716 | } |
Christian Krafft | 36ca4ba | 2006-10-24 18:39:45 +0200 | [diff] [blame] | 1717 | EXPORT_SYMBOL(of_get_cpu_node); |
Michael Ellerman | 7a4571a | 2006-06-23 18:16:03 +1000 | [diff] [blame] | 1718 | |
| 1719 | #ifdef DEBUG |
| 1720 | static struct debugfs_blob_wrapper flat_dt_blob; |
| 1721 | |
| 1722 | static int __init export_flat_device_tree(void) |
| 1723 | { |
| 1724 | struct dentry *d; |
| 1725 | |
| 1726 | d = debugfs_create_dir("powerpc", NULL); |
| 1727 | if (!d) |
| 1728 | return 1; |
| 1729 | |
| 1730 | flat_dt_blob.data = initial_boot_params; |
| 1731 | flat_dt_blob.size = initial_boot_params->totalsize; |
| 1732 | |
| 1733 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, |
| 1734 | d, &flat_dt_blob); |
| 1735 | if (!d) |
| 1736 | return 1; |
| 1737 | |
| 1738 | return 0; |
| 1739 | } |
| 1740 | __initcall(export_flat_device_tree); |
| 1741 | #endif |