1 /* 2 * Procedures for creating, accessing and interpreting the device tree. 3 * 4 * Paul Mackerras August 1996. 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * 7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 8 * {engebret|bergner}@us.ibm.com 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #undef DEBUG 17 18 #include <stdarg.h> 19 #include <linux/config.h> 20 #include <linux/kernel.h> 21 #include <linux/string.h> 22 #include <linux/init.h> 23 #include <linux/threads.h> 24 #include <linux/spinlock.h> 25 #include <linux/types.h> 26 #include <linux/pci.h> 27 #include <linux/stringify.h> 28 #include <linux/delay.h> 29 #include <linux/initrd.h> 30 #include <linux/bitops.h> 31 #include <linux/module.h> 32 33 #include <asm/prom.h> 34 #include <asm/rtas.h> 35 #include <asm/lmb.h> 36 #include <asm/page.h> 37 #include <asm/processor.h> 38 #include <asm/irq.h> 39 #include <asm/io.h> 40 #include <asm/smp.h> 41 #include <asm/system.h> 42 #include <asm/mmu.h> 43 #include <asm/pgtable.h> 44 #include <asm/pci.h> 45 #include <asm/iommu.h> 46 #include <asm/btext.h> 47 #include <asm/sections.h> 48 #include <asm/machdep.h> 49 #include <asm/pSeries_reconfig.h> 50 #include <asm/pci-bridge.h> 51 #ifdef CONFIG_PPC64 52 #include <asm/systemcfg.h> 53 #endif 54 55 #ifdef DEBUG 56 #define DBG(fmt...) printk(KERN_ERR fmt) 57 #else 58 #define DBG(fmt...) 59 #endif 60 61 struct pci_reg_property { 62 struct pci_address addr; 63 u32 size_hi; 64 u32 size_lo; 65 }; 66 67 struct isa_reg_property { 68 u32 space; 69 u32 address; 70 u32 size; 71 }; 72 73 74 typedef int interpret_func(struct device_node *, unsigned long *, 75 int, int, int); 76 77 extern struct rtas_t rtas; 78 extern struct lmb lmb; 79 extern unsigned long klimit; 80 81 static unsigned long memory_limit; 82 83 static int __initdata dt_root_addr_cells; 84 static int __initdata dt_root_size_cells; 85 86 #ifdef CONFIG_PPC64 87 static int __initdata iommu_is_off; 88 int __initdata iommu_force_on; 89 extern unsigned long tce_alloc_start, tce_alloc_end; 90 #endif 91 92 typedef u32 cell_t; 93 94 #if 0 95 static struct boot_param_header *initial_boot_params __initdata; 96 #else 97 struct boot_param_header *initial_boot_params; 98 #endif 99 100 static struct device_node *allnodes = NULL; 101 102 /* use when traversing tree through the allnext, child, sibling, 103 * or parent members of struct device_node. 104 */ 105 static DEFINE_RWLOCK(devtree_lock); 106 107 /* export that to outside world */ 108 struct device_node *of_chosen; 109 110 struct device_node *dflt_interrupt_controller; 111 int num_interrupt_controllers; 112 113 u32 rtas_data; 114 u32 rtas_entry; 115 116 /* 117 * Wrapper for allocating memory for various data that needs to be 118 * attached to device nodes as they are processed at boot or when 119 * added to the device tree later (e.g. DLPAR). At boot there is 120 * already a region reserved so we just increment *mem_start by size; 121 * otherwise we call kmalloc. 122 */ 123 static void * prom_alloc(unsigned long size, unsigned long *mem_start) 124 { 125 unsigned long tmp; 126 127 if (!mem_start) 128 return kmalloc(size, GFP_KERNEL); 129 130 tmp = *mem_start; 131 *mem_start += size; 132 return (void *)tmp; 133 } 134 135 /* 136 * Find the device_node with a given phandle. 137 */ 138 static struct device_node * find_phandle(phandle ph) 139 { 140 struct device_node *np; 141 142 for (np = allnodes; np != 0; np = np->allnext) 143 if (np->linux_phandle == ph) 144 return np; 145 return NULL; 146 } 147 148 /* 149 * Find the interrupt parent of a node. 150 */ 151 static struct device_node * __devinit intr_parent(struct device_node *p) 152 { 153 phandle *parp; 154 155 parp = (phandle *) get_property(p, "interrupt-parent", NULL); 156 if (parp == NULL) 157 return p->parent; 158 p = find_phandle(*parp); 159 if (p != NULL) 160 return p; 161 /* 162 * On a powermac booted with BootX, we don't get to know the 163 * phandles for any nodes, so find_phandle will return NULL. 164 * Fortunately these machines only have one interrupt controller 165 * so there isn't in fact any ambiguity. -- paulus 166 */ 167 if (num_interrupt_controllers == 1) 168 p = dflt_interrupt_controller; 169 return p; 170 } 171 172 /* 173 * Find out the size of each entry of the interrupts property 174 * for a node. 175 */ 176 int __devinit prom_n_intr_cells(struct device_node *np) 177 { 178 struct device_node *p; 179 unsigned int *icp; 180 181 for (p = np; (p = intr_parent(p)) != NULL; ) { 182 icp = (unsigned int *) 183 get_property(p, "#interrupt-cells", NULL); 184 if (icp != NULL) 185 return *icp; 186 if (get_property(p, "interrupt-controller", NULL) != NULL 187 || get_property(p, "interrupt-map", NULL) != NULL) { 188 printk("oops, node %s doesn't have #interrupt-cells\n", 189 p->full_name); 190 return 1; 191 } 192 } 193 #ifdef DEBUG_IRQ 194 printk("prom_n_intr_cells failed for %s\n", np->full_name); 195 #endif 196 return 1; 197 } 198 199 /* 200 * Map an interrupt from a device up to the platform interrupt 201 * descriptor. 202 */ 203 static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler, 204 struct device_node *np, unsigned int *ints, 205 int nintrc) 206 { 207 struct device_node *p, *ipar; 208 unsigned int *imap, *imask, *ip; 209 int i, imaplen, match; 210 int newintrc = 0, newaddrc = 0; 211 unsigned int *reg; 212 int naddrc; 213 214 reg = (unsigned int *) get_property(np, "reg", NULL); 215 naddrc = prom_n_addr_cells(np); 216 p = intr_parent(np); 217 while (p != NULL) { 218 if (get_property(p, "interrupt-controller", NULL) != NULL) 219 /* this node is an interrupt controller, stop here */ 220 break; 221 imap = (unsigned int *) 222 get_property(p, "interrupt-map", &imaplen); 223 if (imap == NULL) { 224 p = intr_parent(p); 225 continue; 226 } 227 imask = (unsigned int *) 228 get_property(p, "interrupt-map-mask", NULL); 229 if (imask == NULL) { 230 printk("oops, %s has interrupt-map but no mask\n", 231 p->full_name); 232 return 0; 233 } 234 imaplen /= sizeof(unsigned int); 235 match = 0; 236 ipar = NULL; 237 while (imaplen > 0 && !match) { 238 /* check the child-interrupt field */ 239 match = 1; 240 for (i = 0; i < naddrc && match; ++i) 241 match = ((reg[i] ^ imap[i]) & imask[i]) == 0; 242 for (; i < naddrc + nintrc && match; ++i) 243 match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0; 244 imap += naddrc + nintrc; 245 imaplen -= naddrc + nintrc; 246 /* grab the interrupt parent */ 247 ipar = find_phandle((phandle) *imap++); 248 --imaplen; 249 if (ipar == NULL && num_interrupt_controllers == 1) 250 /* cope with BootX not giving us phandles */ 251 ipar = dflt_interrupt_controller; 252 if (ipar == NULL) { 253 printk("oops, no int parent %x in map of %s\n", 254 imap[-1], p->full_name); 255 return 0; 256 } 257 /* find the parent's # addr and intr cells */ 258 ip = (unsigned int *) 259 get_property(ipar, "#interrupt-cells", NULL); 260 if (ip == NULL) { 261 printk("oops, no #interrupt-cells on %s\n", 262 ipar->full_name); 263 return 0; 264 } 265 newintrc = *ip; 266 ip = (unsigned int *) 267 get_property(ipar, "#address-cells", NULL); 268 newaddrc = (ip == NULL)? 0: *ip; 269 imap += newaddrc + newintrc; 270 imaplen -= newaddrc + newintrc; 271 } 272 if (imaplen < 0) { 273 printk("oops, error decoding int-map on %s, len=%d\n", 274 p->full_name, imaplen); 275 return 0; 276 } 277 if (!match) { 278 #ifdef DEBUG_IRQ 279 printk("oops, no match in %s int-map for %s\n", 280 p->full_name, np->full_name); 281 #endif 282 return 0; 283 } 284 p = ipar; 285 naddrc = newaddrc; 286 nintrc = newintrc; 287 ints = imap - nintrc; 288 reg = ints - naddrc; 289 } 290 if (p == NULL) { 291 #ifdef DEBUG_IRQ 292 printk("hmmm, int tree for %s doesn't have ctrler\n", 293 np->full_name); 294 #endif 295 return 0; 296 } 297 *irq = ints; 298 *ictrler = p; 299 return nintrc; 300 } 301 302 static int __devinit finish_node_interrupts(struct device_node *np, 303 unsigned long *mem_start, 304 int measure_only) 305 { 306 unsigned int *ints; 307 int intlen, intrcells, intrcount; 308 int i, j, n; 309 unsigned int *irq, virq; 310 struct device_node *ic; 311 312 if (num_interrupt_controllers == 0) { 313 /* 314 * Old machines just have a list of interrupt numbers 315 * and no interrupt-controller nodes. 316 */ 317 ints = (unsigned int *) get_property(np, "AAPL,interrupts", 318 &intlen); 319 /* XXX old interpret_pci_props looked in parent too */ 320 /* XXX old interpret_macio_props looked for interrupts 321 before AAPL,interrupts */ 322 if (ints == NULL) 323 ints = (unsigned int *) get_property(np, "interrupts", 324 &intlen); 325 if (ints == NULL) 326 return 0; 327 328 np->n_intrs = intlen / sizeof(unsigned int); 329 np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]), 330 mem_start); 331 if (!np->intrs) 332 return -ENOMEM; 333 if (measure_only) 334 return 0; 335 336 for (i = 0; i < np->n_intrs; ++i) { 337 np->intrs[i].line = *ints++; 338 np->intrs[i].sense = 1; 339 } 340 return 0; 341 } 342 343 ints = (unsigned int *) get_property(np, "interrupts", &intlen); 344 if (ints == NULL) 345 return 0; 346 intrcells = prom_n_intr_cells(np); 347 intlen /= intrcells * sizeof(unsigned int); 348 349 np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start); 350 if (!np->intrs) 351 return -ENOMEM; 352 353 if (measure_only) 354 return 0; 355 356 intrcount = 0; 357 for (i = 0; i < intlen; ++i, ints += intrcells) { 358 n = map_interrupt(&irq, &ic, np, ints, intrcells); 359 if (n <= 0) 360 continue; 361 362 /* don't map IRQ numbers under a cascaded 8259 controller */ 363 if (ic && device_is_compatible(ic, "chrp,iic")) { 364 np->intrs[intrcount].line = irq[0]; 365 } else { 366 #ifdef CONFIG_PPC64 367 virq = virt_irq_create_mapping(irq[0]); 368 if (virq == NO_IRQ) { 369 printk(KERN_CRIT "Could not allocate interrupt" 370 " number for %s\n", np->full_name); 371 continue; 372 } 373 virq = irq_offset_up(virq); 374 #else 375 virq = irq[0]; 376 #endif 377 np->intrs[intrcount].line = virq; 378 } 379 380 #ifdef CONFIG_PPC64 381 /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */ 382 if (systemcfg->platform == PLATFORM_POWERMAC && ic && ic->parent) { 383 char *name = get_property(ic->parent, "name", NULL); 384 if (name && !strcmp(name, "u3")) 385 np->intrs[intrcount].line += 128; 386 else if (!(name && !strcmp(name, "mac-io"))) 387 /* ignore other cascaded controllers, such as 388 the k2-sata-root */ 389 break; 390 } 391 #endif 392 np->intrs[intrcount].sense = 1; 393 if (n > 1) 394 np->intrs[intrcount].sense = irq[1]; 395 if (n > 2) { 396 printk("hmmm, got %d intr cells for %s:", n, 397 np->full_name); 398 for (j = 0; j < n; ++j) 399 printk(" %d", irq[j]); 400 printk("\n"); 401 } 402 ++intrcount; 403 } 404 np->n_intrs = intrcount; 405 406 return 0; 407 } 408 409 static int __devinit interpret_pci_props(struct device_node *np, 410 unsigned long *mem_start, 411 int naddrc, int nsizec, 412 int measure_only) 413 { 414 struct address_range *adr; 415 struct pci_reg_property *pci_addrs; 416 int i, l, n_addrs; 417 418 pci_addrs = (struct pci_reg_property *) 419 get_property(np, "assigned-addresses", &l); 420 if (!pci_addrs) 421 return 0; 422 423 n_addrs = l / sizeof(*pci_addrs); 424 425 adr = prom_alloc(n_addrs * sizeof(*adr), mem_start); 426 if (!adr) 427 return -ENOMEM; 428 429 if (measure_only) 430 return 0; 431 432 np->addrs = adr; 433 np->n_addrs = n_addrs; 434 435 for (i = 0; i < n_addrs; i++) { 436 adr[i].space = pci_addrs[i].addr.a_hi; 437 adr[i].address = pci_addrs[i].addr.a_lo | 438 ((u64)pci_addrs[i].addr.a_mid << 32); 439 adr[i].size = pci_addrs[i].size_lo; 440 } 441 442 return 0; 443 } 444 445 static int __init interpret_dbdma_props(struct device_node *np, 446 unsigned long *mem_start, 447 int naddrc, int nsizec, 448 int measure_only) 449 { 450 struct reg_property32 *rp; 451 struct address_range *adr; 452 unsigned long base_address; 453 int i, l; 454 struct device_node *db; 455 456 base_address = 0; 457 if (!measure_only) { 458 for (db = np->parent; db != NULL; db = db->parent) { 459 if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) { 460 base_address = db->addrs[0].address; 461 break; 462 } 463 } 464 } 465 466 rp = (struct reg_property32 *) get_property(np, "reg", &l); 467 if (rp != 0 && l >= sizeof(struct reg_property32)) { 468 i = 0; 469 adr = (struct address_range *) (*mem_start); 470 while ((l -= sizeof(struct reg_property32)) >= 0) { 471 if (!measure_only) { 472 adr[i].space = 2; 473 adr[i].address = rp[i].address + base_address; 474 adr[i].size = rp[i].size; 475 } 476 ++i; 477 } 478 np->addrs = adr; 479 np->n_addrs = i; 480 (*mem_start) += i * sizeof(struct address_range); 481 } 482 483 return 0; 484 } 485 486 static int __init interpret_macio_props(struct device_node *np, 487 unsigned long *mem_start, 488 int naddrc, int nsizec, 489 int measure_only) 490 { 491 struct reg_property32 *rp; 492 struct address_range *adr; 493 unsigned long base_address; 494 int i, l; 495 struct device_node *db; 496 497 base_address = 0; 498 if (!measure_only) { 499 for (db = np->parent; db != NULL; db = db->parent) { 500 if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) { 501 base_address = db->addrs[0].address; 502 break; 503 } 504 } 505 } 506 507 rp = (struct reg_property32 *) get_property(np, "reg", &l); 508 if (rp != 0 && l >= sizeof(struct reg_property32)) { 509 i = 0; 510 adr = (struct address_range *) (*mem_start); 511 while ((l -= sizeof(struct reg_property32)) >= 0) { 512 if (!measure_only) { 513 adr[i].space = 2; 514 adr[i].address = rp[i].address + base_address; 515 adr[i].size = rp[i].size; 516 } 517 ++i; 518 } 519 np->addrs = adr; 520 np->n_addrs = i; 521 (*mem_start) += i * sizeof(struct address_range); 522 } 523 524 return 0; 525 } 526 527 static int __init interpret_isa_props(struct device_node *np, 528 unsigned long *mem_start, 529 int naddrc, int nsizec, 530 int measure_only) 531 { 532 struct isa_reg_property *rp; 533 struct address_range *adr; 534 int i, l; 535 536 rp = (struct isa_reg_property *) get_property(np, "reg", &l); 537 if (rp != 0 && l >= sizeof(struct isa_reg_property)) { 538 i = 0; 539 adr = (struct address_range *) (*mem_start); 540 while ((l -= sizeof(struct isa_reg_property)) >= 0) { 541 if (!measure_only) { 542 adr[i].space = rp[i].space; 543 adr[i].address = rp[i].address; 544 adr[i].size = rp[i].size; 545 } 546 ++i; 547 } 548 np->addrs = adr; 549 np->n_addrs = i; 550 (*mem_start) += i * sizeof(struct address_range); 551 } 552 553 return 0; 554 } 555 556 static int __init interpret_root_props(struct device_node *np, 557 unsigned long *mem_start, 558 int naddrc, int nsizec, 559 int measure_only) 560 { 561 struct address_range *adr; 562 int i, l; 563 unsigned int *rp; 564 int rpsize = (naddrc + nsizec) * sizeof(unsigned int); 565 566 rp = (unsigned int *) get_property(np, "reg", &l); 567 if (rp != 0 && l >= rpsize) { 568 i = 0; 569 adr = (struct address_range *) (*mem_start); 570 while ((l -= rpsize) >= 0) { 571 if (!measure_only) { 572 adr[i].space = 0; 573 adr[i].address = rp[naddrc - 1]; 574 adr[i].size = rp[naddrc + nsizec - 1]; 575 } 576 ++i; 577 rp += naddrc + nsizec; 578 } 579 np->addrs = adr; 580 np->n_addrs = i; 581 (*mem_start) += i * sizeof(struct address_range); 582 } 583 584 return 0; 585 } 586 587 static int __devinit finish_node(struct device_node *np, 588 unsigned long *mem_start, 589 interpret_func *ifunc, 590 int naddrc, int nsizec, 591 int measure_only) 592 { 593 struct device_node *child; 594 int *ip, rc = 0; 595 596 /* get the device addresses and interrupts */ 597 if (ifunc != NULL) 598 rc = ifunc(np, mem_start, naddrc, nsizec, measure_only); 599 if (rc) 600 goto out; 601 602 rc = finish_node_interrupts(np, mem_start, measure_only); 603 if (rc) 604 goto out; 605 606 /* Look for #address-cells and #size-cells properties. */ 607 ip = (int *) get_property(np, "#address-cells", NULL); 608 if (ip != NULL) 609 naddrc = *ip; 610 ip = (int *) get_property(np, "#size-cells", NULL); 611 if (ip != NULL) 612 nsizec = *ip; 613 614 if (!strcmp(np->name, "device-tree") || np->parent == NULL) 615 ifunc = interpret_root_props; 616 else if (np->type == 0) 617 ifunc = NULL; 618 else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci")) 619 ifunc = interpret_pci_props; 620 else if (!strcmp(np->type, "dbdma")) 621 ifunc = interpret_dbdma_props; 622 else if (!strcmp(np->type, "mac-io") || ifunc == interpret_macio_props) 623 ifunc = interpret_macio_props; 624 else if (!strcmp(np->type, "isa")) 625 ifunc = interpret_isa_props; 626 else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3")) 627 ifunc = interpret_root_props; 628 else if (!((ifunc == interpret_dbdma_props 629 || ifunc == interpret_macio_props) 630 && (!strcmp(np->type, "escc") 631 || !strcmp(np->type, "media-bay")))) 632 ifunc = NULL; 633 634 for (child = np->child; child != NULL; child = child->sibling) { 635 rc = finish_node(child, mem_start, ifunc, 636 naddrc, nsizec, measure_only); 637 if (rc) 638 goto out; 639 } 640 out: 641 return rc; 642 } 643 644 static void __init scan_interrupt_controllers(void) 645 { 646 struct device_node *np; 647 int n = 0; 648 char *name, *ic; 649 int iclen; 650 651 for (np = allnodes; np != NULL; np = np->allnext) { 652 ic = get_property(np, "interrupt-controller", &iclen); 653 name = get_property(np, "name", NULL); 654 /* checking iclen makes sure we don't get a false 655 match on /chosen.interrupt_controller */ 656 if ((name != NULL 657 && strcmp(name, "interrupt-controller") == 0) 658 || (ic != NULL && iclen == 0 659 && strcmp(name, "AppleKiwi"))) { 660 if (n == 0) 661 dflt_interrupt_controller = np; 662 ++n; 663 } 664 } 665 num_interrupt_controllers = n; 666 } 667 668 /** 669 * finish_device_tree is called once things are running normally 670 * (i.e. with text and data mapped to the address they were linked at). 671 * It traverses the device tree and fills in some of the additional, 672 * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt 673 * mapping is also initialized at this point. 674 */ 675 void __init finish_device_tree(void) 676 { 677 unsigned long start, end, size = 0; 678 679 DBG(" -> finish_device_tree\n"); 680 681 #ifdef CONFIG_PPC64 682 /* Initialize virtual IRQ map */ 683 virt_irq_init(); 684 #endif 685 scan_interrupt_controllers(); 686 687 /* 688 * Finish device-tree (pre-parsing some properties etc...) 689 * We do this in 2 passes. One with "measure_only" set, which 690 * will only measure the amount of memory needed, then we can 691 * allocate that memory, and call finish_node again. However, 692 * we must be careful as most routines will fail nowadays when 693 * prom_alloc() returns 0, so we must make sure our first pass 694 * doesn't start at 0. We pre-initialize size to 16 for that 695 * reason and then remove those additional 16 bytes 696 */ 697 size = 16; 698 finish_node(allnodes, &size, NULL, 0, 0, 1); 699 size -= 16; 700 end = start = (unsigned long) __va(lmb_alloc(size, 128)); 701 finish_node(allnodes, &end, NULL, 0, 0, 0); 702 BUG_ON(end != start + size); 703 704 DBG(" <- finish_device_tree\n"); 705 } 706 707 static inline char *find_flat_dt_string(u32 offset) 708 { 709 return ((char *)initial_boot_params) + 710 initial_boot_params->off_dt_strings + offset; 711 } 712 713 /** 714 * This function is used to scan the flattened device-tree, it is 715 * used to extract the memory informations at boot before we can 716 * unflatten the tree 717 */ 718 static int __init scan_flat_dt(int (*it)(unsigned long node, 719 const char *uname, int depth, 720 void *data), 721 void *data) 722 { 723 unsigned long p = ((unsigned long)initial_boot_params) + 724 initial_boot_params->off_dt_struct; 725 int rc = 0; 726 int depth = -1; 727 728 do { 729 u32 tag = *((u32 *)p); 730 char *pathp; 731 732 p += 4; 733 if (tag == OF_DT_END_NODE) { 734 depth --; 735 continue; 736 } 737 if (tag == OF_DT_NOP) 738 continue; 739 if (tag == OF_DT_END) 740 break; 741 if (tag == OF_DT_PROP) { 742 u32 sz = *((u32 *)p); 743 p += 8; 744 if (initial_boot_params->version < 0x10) 745 p = _ALIGN(p, sz >= 8 ? 8 : 4); 746 p += sz; 747 p = _ALIGN(p, 4); 748 continue; 749 } 750 if (tag != OF_DT_BEGIN_NODE) { 751 printk(KERN_WARNING "Invalid tag %x scanning flattened" 752 " device tree !\n", tag); 753 return -EINVAL; 754 } 755 depth++; 756 pathp = (char *)p; 757 p = _ALIGN(p + strlen(pathp) + 1, 4); 758 if ((*pathp) == '/') { 759 char *lp, *np; 760 for (lp = NULL, np = pathp; *np; np++) 761 if ((*np) == '/') 762 lp = np+1; 763 if (lp != NULL) 764 pathp = lp; 765 } 766 rc = it(p, pathp, depth, data); 767 if (rc != 0) 768 break; 769 } while(1); 770 771 return rc; 772 } 773 774 /** 775 * This function can be used within scan_flattened_dt callback to get 776 * access to properties 777 */ 778 static void* __init get_flat_dt_prop(unsigned long node, const char *name, 779 unsigned long *size) 780 { 781 unsigned long p = node; 782 783 do { 784 u32 tag = *((u32 *)p); 785 u32 sz, noff; 786 const char *nstr; 787 788 p += 4; 789 if (tag == OF_DT_NOP) 790 continue; 791 if (tag != OF_DT_PROP) 792 return NULL; 793 794 sz = *((u32 *)p); 795 noff = *((u32 *)(p + 4)); 796 p += 8; 797 if (initial_boot_params->version < 0x10) 798 p = _ALIGN(p, sz >= 8 ? 8 : 4); 799 800 nstr = find_flat_dt_string(noff); 801 if (nstr == NULL) { 802 printk(KERN_WARNING "Can't find property index" 803 " name !\n"); 804 return NULL; 805 } 806 if (strcmp(name, nstr) == 0) { 807 if (size) 808 *size = sz; 809 return (void *)p; 810 } 811 p += sz; 812 p = _ALIGN(p, 4); 813 } while(1); 814 } 815 816 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, 817 unsigned long align) 818 { 819 void *res; 820 821 *mem = _ALIGN(*mem, align); 822 res = (void *)*mem; 823 *mem += size; 824 825 return res; 826 } 827 828 static unsigned long __init unflatten_dt_node(unsigned long mem, 829 unsigned long *p, 830 struct device_node *dad, 831 struct device_node ***allnextpp, 832 unsigned long fpsize) 833 { 834 struct device_node *np; 835 struct property *pp, **prev_pp = NULL; 836 char *pathp; 837 u32 tag; 838 unsigned int l, allocl; 839 int has_name = 0; 840 int new_format = 0; 841 842 tag = *((u32 *)(*p)); 843 if (tag != OF_DT_BEGIN_NODE) { 844 printk("Weird tag at start of node: %x\n", tag); 845 return mem; 846 } 847 *p += 4; 848 pathp = (char *)*p; 849 l = allocl = strlen(pathp) + 1; 850 *p = _ALIGN(*p + l, 4); 851 852 /* version 0x10 has a more compact unit name here instead of the full 853 * path. we accumulate the full path size using "fpsize", we'll rebuild 854 * it later. We detect this because the first character of the name is 855 * not '/'. 856 */ 857 if ((*pathp) != '/') { 858 new_format = 1; 859 if (fpsize == 0) { 860 /* root node: special case. fpsize accounts for path 861 * plus terminating zero. root node only has '/', so 862 * fpsize should be 2, but we want to avoid the first 863 * level nodes to have two '/' so we use fpsize 1 here 864 */ 865 fpsize = 1; 866 allocl = 2; 867 } else { 868 /* account for '/' and path size minus terminal 0 869 * already in 'l' 870 */ 871 fpsize += l; 872 allocl = fpsize; 873 } 874 } 875 876 877 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, 878 __alignof__(struct device_node)); 879 if (allnextpp) { 880 memset(np, 0, sizeof(*np)); 881 np->full_name = ((char*)np) + sizeof(struct device_node); 882 if (new_format) { 883 char *p = np->full_name; 884 /* rebuild full path for new format */ 885 if (dad && dad->parent) { 886 strcpy(p, dad->full_name); 887 #ifdef DEBUG 888 if ((strlen(p) + l + 1) != allocl) { 889 DBG("%s: p: %d, l: %d, a: %d\n", 890 pathp, strlen(p), l, allocl); 891 } 892 #endif 893 p += strlen(p); 894 } 895 *(p++) = '/'; 896 memcpy(p, pathp, l); 897 } else 898 memcpy(np->full_name, pathp, l); 899 prev_pp = &np->properties; 900 **allnextpp = np; 901 *allnextpp = &np->allnext; 902 if (dad != NULL) { 903 np->parent = dad; 904 /* we temporarily use the next field as `last_child'*/ 905 if (dad->next == 0) 906 dad->child = np; 907 else 908 dad->next->sibling = np; 909 dad->next = np; 910 } 911 kref_init(&np->kref); 912 } 913 while(1) { 914 u32 sz, noff; 915 char *pname; 916 917 tag = *((u32 *)(*p)); 918 if (tag == OF_DT_NOP) { 919 *p += 4; 920 continue; 921 } 922 if (tag != OF_DT_PROP) 923 break; 924 *p += 4; 925 sz = *((u32 *)(*p)); 926 noff = *((u32 *)((*p) + 4)); 927 *p += 8; 928 if (initial_boot_params->version < 0x10) 929 *p = _ALIGN(*p, sz >= 8 ? 8 : 4); 930 931 pname = find_flat_dt_string(noff); 932 if (pname == NULL) { 933 printk("Can't find property name in list !\n"); 934 break; 935 } 936 if (strcmp(pname, "name") == 0) 937 has_name = 1; 938 l = strlen(pname) + 1; 939 pp = unflatten_dt_alloc(&mem, sizeof(struct property), 940 __alignof__(struct property)); 941 if (allnextpp) { 942 if (strcmp(pname, "linux,phandle") == 0) { 943 np->node = *((u32 *)*p); 944 if (np->linux_phandle == 0) 945 np->linux_phandle = np->node; 946 } 947 if (strcmp(pname, "ibm,phandle") == 0) 948 np->linux_phandle = *((u32 *)*p); 949 pp->name = pname; 950 pp->length = sz; 951 pp->value = (void *)*p; 952 *prev_pp = pp; 953 prev_pp = &pp->next; 954 } 955 *p = _ALIGN((*p) + sz, 4); 956 } 957 /* with version 0x10 we may not have the name property, recreate 958 * it here from the unit name if absent 959 */ 960 if (!has_name) { 961 char *p = pathp, *ps = pathp, *pa = NULL; 962 int sz; 963 964 while (*p) { 965 if ((*p) == '@') 966 pa = p; 967 if ((*p) == '/') 968 ps = p + 1; 969 p++; 970 } 971 if (pa < ps) 972 pa = p; 973 sz = (pa - ps) + 1; 974 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, 975 __alignof__(struct property)); 976 if (allnextpp) { 977 pp->name = "name"; 978 pp->length = sz; 979 pp->value = (unsigned char *)(pp + 1); 980 *prev_pp = pp; 981 prev_pp = &pp->next; 982 memcpy(pp->value, ps, sz - 1); 983 ((char *)pp->value)[sz - 1] = 0; 984 DBG("fixed up name for %s -> %s\n", pathp, pp->value); 985 } 986 } 987 if (allnextpp) { 988 *prev_pp = NULL; 989 np->name = get_property(np, "name", NULL); 990 np->type = get_property(np, "device_type", NULL); 991 992 if (!np->name) 993 np->name = "<NULL>"; 994 if (!np->type) 995 np->type = "<NULL>"; 996 } 997 while (tag == OF_DT_BEGIN_NODE) { 998 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); 999 tag = *((u32 *)(*p)); 1000 } 1001 if (tag != OF_DT_END_NODE) { 1002 printk("Weird tag at end of node: %x\n", tag); 1003 return mem; 1004 } 1005 *p += 4; 1006 return mem; 1007 } 1008 1009 1010 /** 1011 * unflattens the device-tree passed by the firmware, creating the 1012 * tree of struct device_node. It also fills the "name" and "type" 1013 * pointers of the nodes so the normal device-tree walking functions 1014 * can be used (this used to be done by finish_device_tree) 1015 */ 1016 void __init unflatten_device_tree(void) 1017 { 1018 unsigned long start, mem, size; 1019 struct device_node **allnextp = &allnodes; 1020 char *p = NULL; 1021 int l = 0; 1022 1023 DBG(" -> unflatten_device_tree()\n"); 1024 1025 /* First pass, scan for size */ 1026 start = ((unsigned long)initial_boot_params) + 1027 initial_boot_params->off_dt_struct; 1028 size = unflatten_dt_node(0, &start, NULL, NULL, 0); 1029 size = (size | 3) + 1; 1030 1031 DBG(" size is %lx, allocating...\n", size); 1032 1033 /* Allocate memory for the expanded device tree */ 1034 mem = lmb_alloc(size + 4, __alignof__(struct device_node)); 1035 if (!mem) { 1036 DBG("Couldn't allocate memory with lmb_alloc()!\n"); 1037 panic("Couldn't allocate memory with lmb_alloc()!\n"); 1038 } 1039 mem = (unsigned long) __va(mem); 1040 1041 ((u32 *)mem)[size / 4] = 0xdeadbeef; 1042 1043 DBG(" unflattening %lx...\n", mem); 1044 1045 /* Second pass, do actual unflattening */ 1046 start = ((unsigned long)initial_boot_params) + 1047 initial_boot_params->off_dt_struct; 1048 unflatten_dt_node(mem, &start, NULL, &allnextp, 0); 1049 if (*((u32 *)start) != OF_DT_END) 1050 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); 1051 if (((u32 *)mem)[size / 4] != 0xdeadbeef) 1052 printk(KERN_WARNING "End of tree marker overwritten: %08x\n", 1053 ((u32 *)mem)[size / 4] ); 1054 *allnextp = NULL; 1055 1056 /* Get pointer to OF "/chosen" node for use everywhere */ 1057 of_chosen = of_find_node_by_path("/chosen"); 1058 if (of_chosen == NULL) 1059 of_chosen = of_find_node_by_path("/chosen@0"); 1060 1061 /* Retreive command line */ 1062 if (of_chosen != NULL) { 1063 p = (char *)get_property(of_chosen, "bootargs", &l); 1064 if (p != NULL && l > 0) 1065 strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE)); 1066 } 1067 #ifdef CONFIG_CMDLINE 1068 if (l == 0 || (l == 1 && (*p) == 0)) 1069 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 1070 #endif /* CONFIG_CMDLINE */ 1071 1072 DBG("Command line is: %s\n", cmd_line); 1073 1074 DBG(" <- unflatten_device_tree()\n"); 1075 } 1076 1077 1078 static int __init early_init_dt_scan_cpus(unsigned long node, 1079 const char *uname, int depth, void *data) 1080 { 1081 char *type = get_flat_dt_prop(node, "device_type", NULL); 1082 u32 *prop; 1083 unsigned long size = 0; 1084 1085 /* We are scanning "cpu" nodes only */ 1086 if (type == NULL || strcmp(type, "cpu") != 0) 1087 return 0; 1088 1089 #ifdef CONFIG_PPC_PSERIES 1090 /* On LPAR, look for the first ibm,pft-size property for the hash table size 1091 */ 1092 if (systemcfg->platform == PLATFORM_PSERIES_LPAR && ppc64_pft_size == 0) { 1093 u32 *pft_size; 1094 pft_size = get_flat_dt_prop(node, "ibm,pft-size", NULL); 1095 if (pft_size != NULL) { 1096 /* pft_size[0] is the NUMA CEC cookie */ 1097 ppc64_pft_size = pft_size[1]; 1098 } 1099 } 1100 #endif 1101 1102 #ifdef CONFIG_PPC64 1103 if (initial_boot_params && initial_boot_params->version >= 2) { 1104 /* version 2 of the kexec param format adds the phys cpuid 1105 * of booted proc. 1106 */ 1107 boot_cpuid_phys = initial_boot_params->boot_cpuid_phys; 1108 boot_cpuid = 0; 1109 } else { 1110 /* Check if it's the boot-cpu, set it's hw index in paca now */ 1111 if (get_flat_dt_prop(node, "linux,boot-cpu", NULL) != NULL) { 1112 prop = get_flat_dt_prop(node, "reg", NULL); 1113 set_hard_smp_processor_id(0, prop == NULL ? 0 : *prop); 1114 boot_cpuid_phys = get_hard_smp_processor_id(0); 1115 } 1116 } 1117 #endif 1118 1119 #ifdef CONFIG_ALTIVEC 1120 /* Check if we have a VMX and eventually update CPU features */ 1121 prop = (u32 *)get_flat_dt_prop(node, "ibm,vmx", &size); 1122 if (prop && (*prop) > 0) { 1123 cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; 1124 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; 1125 } 1126 1127 /* Same goes for Apple's "altivec" property */ 1128 prop = (u32 *)get_flat_dt_prop(node, "altivec", NULL); 1129 if (prop) { 1130 cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; 1131 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; 1132 } 1133 #endif /* CONFIG_ALTIVEC */ 1134 1135 #ifdef CONFIG_PPC_PSERIES 1136 /* 1137 * Check for an SMT capable CPU and set the CPU feature. We do 1138 * this by looking at the size of the ibm,ppc-interrupt-server#s 1139 * property 1140 */ 1141 prop = (u32 *)get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", 1142 &size); 1143 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 1144 if (prop && ((size / sizeof(u32)) > 1)) 1145 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 1146 #endif 1147 1148 return 0; 1149 } 1150 1151 static int __init early_init_dt_scan_chosen(unsigned long node, 1152 const char *uname, int depth, void *data) 1153 { 1154 u32 *prop; 1155 unsigned long *lprop; 1156 1157 DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); 1158 1159 if (depth != 1 || 1160 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 1161 return 0; 1162 1163 /* get platform type */ 1164 prop = (u32 *)get_flat_dt_prop(node, "linux,platform", NULL); 1165 if (prop == NULL) 1166 return 0; 1167 #ifdef CONFIG_PPC64 1168 systemcfg->platform = *prop; 1169 #else 1170 _machine = *prop; 1171 #endif 1172 1173 #ifdef CONFIG_PPC64 1174 /* check if iommu is forced on or off */ 1175 if (get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 1176 iommu_is_off = 1; 1177 if (get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 1178 iommu_force_on = 1; 1179 #endif 1180 1181 lprop = get_flat_dt_prop(node, "linux,memory-limit", NULL); 1182 if (lprop) 1183 memory_limit = *lprop; 1184 1185 #ifdef CONFIG_PPC64 1186 lprop = get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 1187 if (lprop) 1188 tce_alloc_start = *lprop; 1189 lprop = get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 1190 if (lprop) 1191 tce_alloc_end = *lprop; 1192 #endif 1193 1194 #ifdef CONFIG_PPC_RTAS 1195 /* To help early debugging via the front panel, we retreive a minimal 1196 * set of RTAS infos now if available 1197 */ 1198 { 1199 u64 *basep, *entryp; 1200 1201 basep = get_flat_dt_prop(node, "linux,rtas-base", NULL); 1202 entryp = get_flat_dt_prop(node, "linux,rtas-entry", NULL); 1203 prop = get_flat_dt_prop(node, "linux,rtas-size", NULL); 1204 if (basep && entryp && prop) { 1205 rtas.base = *basep; 1206 rtas.entry = *entryp; 1207 rtas.size = *prop; 1208 } 1209 } 1210 #endif /* CONFIG_PPC_RTAS */ 1211 1212 /* break now */ 1213 return 1; 1214 } 1215 1216 static int __init early_init_dt_scan_root(unsigned long node, 1217 const char *uname, int depth, void *data) 1218 { 1219 u32 *prop; 1220 1221 if (depth != 0) 1222 return 0; 1223 1224 prop = get_flat_dt_prop(node, "#size-cells", NULL); 1225 dt_root_size_cells = (prop == NULL) ? 1 : *prop; 1226 DBG("dt_root_size_cells = %x\n", dt_root_size_cells); 1227 1228 prop = get_flat_dt_prop(node, "#address-cells", NULL); 1229 dt_root_addr_cells = (prop == NULL) ? 2 : *prop; 1230 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); 1231 1232 /* break now */ 1233 return 1; 1234 } 1235 1236 static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) 1237 { 1238 cell_t *p = *cellp; 1239 unsigned long r; 1240 1241 /* Ignore more than 2 cells */ 1242 while (s > sizeof(unsigned long) / 4) { 1243 p++; 1244 s--; 1245 } 1246 r = *p++; 1247 #ifdef CONFIG_PPC64 1248 if (s > 1) { 1249 r <<= 32; 1250 r |= *(p++); 1251 s--; 1252 } 1253 #endif 1254 1255 *cellp = p; 1256 return r; 1257 } 1258 1259 1260 static int __init early_init_dt_scan_memory(unsigned long node, 1261 const char *uname, int depth, void *data) 1262 { 1263 char *type = get_flat_dt_prop(node, "device_type", NULL); 1264 cell_t *reg, *endp; 1265 unsigned long l; 1266 1267 /* We are scanning "memory" nodes only */ 1268 if (type == NULL || strcmp(type, "memory") != 0) 1269 return 0; 1270 1271 reg = (cell_t *)get_flat_dt_prop(node, "reg", &l); 1272 if (reg == NULL) 1273 return 0; 1274 1275 endp = reg + (l / sizeof(cell_t)); 1276 1277 DBG("memory scan node %s ..., reg size %ld, data: %x %x %x %x, ...\n", 1278 uname, l, reg[0], reg[1], reg[2], reg[3]); 1279 1280 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { 1281 unsigned long base, size; 1282 1283 base = dt_mem_next_cell(dt_root_addr_cells, ®); 1284 size = dt_mem_next_cell(dt_root_size_cells, ®); 1285 1286 if (size == 0) 1287 continue; 1288 DBG(" - %lx , %lx\n", base, size); 1289 #ifdef CONFIG_PPC64 1290 if (iommu_is_off) { 1291 if (base >= 0x80000000ul) 1292 continue; 1293 if ((base + size) > 0x80000000ul) 1294 size = 0x80000000ul - base; 1295 } 1296 #endif 1297 lmb_add(base, size); 1298 } 1299 return 0; 1300 } 1301 1302 static void __init early_reserve_mem(void) 1303 { 1304 unsigned long base, size; 1305 unsigned long *reserve_map; 1306 1307 reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) + 1308 initial_boot_params->off_mem_rsvmap); 1309 while (1) { 1310 base = *(reserve_map++); 1311 size = *(reserve_map++); 1312 if (size == 0) 1313 break; 1314 DBG("reserving: %lx -> %lx\n", base, size); 1315 lmb_reserve(base, size); 1316 } 1317 1318 #if 0 1319 DBG("memory reserved, lmbs :\n"); 1320 lmb_dump_all(); 1321 #endif 1322 } 1323 1324 void __init early_init_devtree(void *params) 1325 { 1326 DBG(" -> early_init_devtree()\n"); 1327 1328 /* Setup flat device-tree pointer */ 1329 initial_boot_params = params; 1330 1331 /* Retrieve various informations from the /chosen node of the 1332 * device-tree, including the platform type, initrd location and 1333 * size, TCE reserve, and more ... 1334 */ 1335 scan_flat_dt(early_init_dt_scan_chosen, NULL); 1336 1337 /* Scan memory nodes and rebuild LMBs */ 1338 lmb_init(); 1339 scan_flat_dt(early_init_dt_scan_root, NULL); 1340 scan_flat_dt(early_init_dt_scan_memory, NULL); 1341 lmb_enforce_memory_limit(memory_limit); 1342 lmb_analyze(); 1343 #ifdef CONFIG_PPC64 1344 systemcfg->physicalMemorySize = lmb_phys_mem_size(); 1345 #endif 1346 lmb_reserve(0, __pa(klimit)); 1347 1348 DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); 1349 1350 /* Reserve LMB regions used by kernel, initrd, dt, etc... */ 1351 early_reserve_mem(); 1352 1353 DBG("Scanning CPUs ...\n"); 1354 1355 /* Retreive hash table size from flattened tree plus other 1356 * CPU related informations (altivec support, boot CPU ID, ...) 1357 */ 1358 scan_flat_dt(early_init_dt_scan_cpus, NULL); 1359 1360 DBG(" <- early_init_devtree()\n"); 1361 } 1362 1363 #undef printk 1364 1365 int 1366 prom_n_addr_cells(struct device_node* np) 1367 { 1368 int* ip; 1369 do { 1370 if (np->parent) 1371 np = np->parent; 1372 ip = (int *) get_property(np, "#address-cells", NULL); 1373 if (ip != NULL) 1374 return *ip; 1375 } while (np->parent); 1376 /* No #address-cells property for the root node, default to 1 */ 1377 return 1; 1378 } 1379 1380 int 1381 prom_n_size_cells(struct device_node* np) 1382 { 1383 int* ip; 1384 do { 1385 if (np->parent) 1386 np = np->parent; 1387 ip = (int *) get_property(np, "#size-cells", NULL); 1388 if (ip != NULL) 1389 return *ip; 1390 } while (np->parent); 1391 /* No #size-cells property for the root node, default to 1 */ 1392 return 1; 1393 } 1394 1395 /** 1396 * Work out the sense (active-low level / active-high edge) 1397 * of each interrupt from the device tree. 1398 */ 1399 void __init prom_get_irq_senses(unsigned char *senses, int off, int max) 1400 { 1401 struct device_node *np; 1402 int i, j; 1403 1404 /* default to level-triggered */ 1405 memset(senses, 1, max - off); 1406 1407 for (np = allnodes; np != 0; np = np->allnext) { 1408 for (j = 0; j < np->n_intrs; j++) { 1409 i = np->intrs[j].line; 1410 if (i >= off && i < max) 1411 senses[i-off] = np->intrs[j].sense ? 1412 IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE : 1413 IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE; 1414 } 1415 } 1416 } 1417 1418 /** 1419 * Construct and return a list of the device_nodes with a given name. 1420 */ 1421 struct device_node *find_devices(const char *name) 1422 { 1423 struct device_node *head, **prevp, *np; 1424 1425 prevp = &head; 1426 for (np = allnodes; np != 0; np = np->allnext) { 1427 if (np->name != 0 && strcasecmp(np->name, name) == 0) { 1428 *prevp = np; 1429 prevp = &np->next; 1430 } 1431 } 1432 *prevp = NULL; 1433 return head; 1434 } 1435 EXPORT_SYMBOL(find_devices); 1436 1437 /** 1438 * Construct and return a list of the device_nodes with a given type. 1439 */ 1440 struct device_node *find_type_devices(const char *type) 1441 { 1442 struct device_node *head, **prevp, *np; 1443 1444 prevp = &head; 1445 for (np = allnodes; np != 0; np = np->allnext) { 1446 if (np->type != 0 && strcasecmp(np->type, type) == 0) { 1447 *prevp = np; 1448 prevp = &np->next; 1449 } 1450 } 1451 *prevp = NULL; 1452 return head; 1453 } 1454 EXPORT_SYMBOL(find_type_devices); 1455 1456 /** 1457 * Returns all nodes linked together 1458 */ 1459 struct device_node *find_all_nodes(void) 1460 { 1461 struct device_node *head, **prevp, *np; 1462 1463 prevp = &head; 1464 for (np = allnodes; np != 0; np = np->allnext) { 1465 *prevp = np; 1466 prevp = &np->next; 1467 } 1468 *prevp = NULL; 1469 return head; 1470 } 1471 EXPORT_SYMBOL(find_all_nodes); 1472 1473 /** Checks if the given "compat" string matches one of the strings in 1474 * the device's "compatible" property 1475 */ 1476 int device_is_compatible(struct device_node *device, const char *compat) 1477 { 1478 const char* cp; 1479 int cplen, l; 1480 1481 cp = (char *) get_property(device, "compatible", &cplen); 1482 if (cp == NULL) 1483 return 0; 1484 while (cplen > 0) { 1485 if (strncasecmp(cp, compat, strlen(compat)) == 0) 1486 return 1; 1487 l = strlen(cp) + 1; 1488 cp += l; 1489 cplen -= l; 1490 } 1491 1492 return 0; 1493 } 1494 EXPORT_SYMBOL(device_is_compatible); 1495 1496 1497 /** 1498 * Indicates whether the root node has a given value in its 1499 * compatible property. 1500 */ 1501 int machine_is_compatible(const char *compat) 1502 { 1503 struct device_node *root; 1504 int rc = 0; 1505 1506 root = of_find_node_by_path("/"); 1507 if (root) { 1508 rc = device_is_compatible(root, compat); 1509 of_node_put(root); 1510 } 1511 return rc; 1512 } 1513 EXPORT_SYMBOL(machine_is_compatible); 1514 1515 /** 1516 * Construct and return a list of the device_nodes with a given type 1517 * and compatible property. 1518 */ 1519 struct device_node *find_compatible_devices(const char *type, 1520 const char *compat) 1521 { 1522 struct device_node *head, **prevp, *np; 1523 1524 prevp = &head; 1525 for (np = allnodes; np != 0; np = np->allnext) { 1526 if (type != NULL 1527 && !(np->type != 0 && strcasecmp(np->type, type) == 0)) 1528 continue; 1529 if (device_is_compatible(np, compat)) { 1530 *prevp = np; 1531 prevp = &np->next; 1532 } 1533 } 1534 *prevp = NULL; 1535 return head; 1536 } 1537 EXPORT_SYMBOL(find_compatible_devices); 1538 1539 /** 1540 * Find the device_node with a given full_name. 1541 */ 1542 struct device_node *find_path_device(const char *path) 1543 { 1544 struct device_node *np; 1545 1546 for (np = allnodes; np != 0; np = np->allnext) 1547 if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0) 1548 return np; 1549 return NULL; 1550 } 1551 EXPORT_SYMBOL(find_path_device); 1552 1553 /******* 1554 * 1555 * New implementation of the OF "find" APIs, return a refcounted 1556 * object, call of_node_put() when done. The device tree and list 1557 * are protected by a rw_lock. 1558 * 1559 * Note that property management will need some locking as well, 1560 * this isn't dealt with yet. 1561 * 1562 *******/ 1563 1564 /** 1565 * of_find_node_by_name - Find a node by its "name" property 1566 * @from: The node to start searching from or NULL, the node 1567 * you pass will not be searched, only the next one 1568 * will; typically, you pass what the previous call 1569 * returned. of_node_put() will be called on it 1570 * @name: The name string to match against 1571 * 1572 * Returns a node pointer with refcount incremented, use 1573 * of_node_put() on it when done. 1574 */ 1575 struct device_node *of_find_node_by_name(struct device_node *from, 1576 const char *name) 1577 { 1578 struct device_node *np; 1579 1580 read_lock(&devtree_lock); 1581 np = from ? from->allnext : allnodes; 1582 for (; np != 0; np = np->allnext) 1583 if (np->name != 0 && strcasecmp(np->name, name) == 0 1584 && of_node_get(np)) 1585 break; 1586 if (from) 1587 of_node_put(from); 1588 read_unlock(&devtree_lock); 1589 return np; 1590 } 1591 EXPORT_SYMBOL(of_find_node_by_name); 1592 1593 /** 1594 * of_find_node_by_type - Find a node by its "device_type" property 1595 * @from: The node to start searching from or NULL, the node 1596 * you pass will not be searched, only the next one 1597 * will; typically, you pass what the previous call 1598 * returned. of_node_put() will be called on it 1599 * @name: The type string to match against 1600 * 1601 * Returns a node pointer with refcount incremented, use 1602 * of_node_put() on it when done. 1603 */ 1604 struct device_node *of_find_node_by_type(struct device_node *from, 1605 const char *type) 1606 { 1607 struct device_node *np; 1608 1609 read_lock(&devtree_lock); 1610 np = from ? from->allnext : allnodes; 1611 for (; np != 0; np = np->allnext) 1612 if (np->type != 0 && strcasecmp(np->type, type) == 0 1613 && of_node_get(np)) 1614 break; 1615 if (from) 1616 of_node_put(from); 1617 read_unlock(&devtree_lock); 1618 return np; 1619 } 1620 EXPORT_SYMBOL(of_find_node_by_type); 1621 1622 /** 1623 * of_find_compatible_node - Find a node based on type and one of the 1624 * tokens in its "compatible" property 1625 * @from: The node to start searching from or NULL, the node 1626 * you pass will not be searched, only the next one 1627 * will; typically, you pass what the previous call 1628 * returned. of_node_put() will be called on it 1629 * @type: The type string to match "device_type" or NULL to ignore 1630 * @compatible: The string to match to one of the tokens in the device 1631 * "compatible" list. 1632 * 1633 * Returns a node pointer with refcount incremented, use 1634 * of_node_put() on it when done. 1635 */ 1636 struct device_node *of_find_compatible_node(struct device_node *from, 1637 const char *type, const char *compatible) 1638 { 1639 struct device_node *np; 1640 1641 read_lock(&devtree_lock); 1642 np = from ? from->allnext : allnodes; 1643 for (; np != 0; np = np->allnext) { 1644 if (type != NULL 1645 && !(np->type != 0 && strcasecmp(np->type, type) == 0)) 1646 continue; 1647 if (device_is_compatible(np, compatible) && of_node_get(np)) 1648 break; 1649 } 1650 if (from) 1651 of_node_put(from); 1652 read_unlock(&devtree_lock); 1653 return np; 1654 } 1655 EXPORT_SYMBOL(of_find_compatible_node); 1656 1657 /** 1658 * of_find_node_by_path - Find a node matching a full OF path 1659 * @path: The full path to match 1660 * 1661 * Returns a node pointer with refcount incremented, use 1662 * of_node_put() on it when done. 1663 */ 1664 struct device_node *of_find_node_by_path(const char *path) 1665 { 1666 struct device_node *np = allnodes; 1667 1668 read_lock(&devtree_lock); 1669 for (; np != 0; np = np->allnext) { 1670 if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0 1671 && of_node_get(np)) 1672 break; 1673 } 1674 read_unlock(&devtree_lock); 1675 return np; 1676 } 1677 EXPORT_SYMBOL(of_find_node_by_path); 1678 1679 /** 1680 * of_find_node_by_phandle - Find a node given a phandle 1681 * @handle: phandle of the node to find 1682 * 1683 * Returns a node pointer with refcount incremented, use 1684 * of_node_put() on it when done. 1685 */ 1686 struct device_node *of_find_node_by_phandle(phandle handle) 1687 { 1688 struct device_node *np; 1689 1690 read_lock(&devtree_lock); 1691 for (np = allnodes; np != 0; np = np->allnext) 1692 if (np->linux_phandle == handle) 1693 break; 1694 if (np) 1695 of_node_get(np); 1696 read_unlock(&devtree_lock); 1697 return np; 1698 } 1699 EXPORT_SYMBOL(of_find_node_by_phandle); 1700 1701 /** 1702 * of_find_all_nodes - Get next node in global list 1703 * @prev: Previous node or NULL to start iteration 1704 * of_node_put() will be called on it 1705 * 1706 * Returns a node pointer with refcount incremented, use 1707 * of_node_put() on it when done. 1708 */ 1709 struct device_node *of_find_all_nodes(struct device_node *prev) 1710 { 1711 struct device_node *np; 1712 1713 read_lock(&devtree_lock); 1714 np = prev ? prev->allnext : allnodes; 1715 for (; np != 0; np = np->allnext) 1716 if (of_node_get(np)) 1717 break; 1718 if (prev) 1719 of_node_put(prev); 1720 read_unlock(&devtree_lock); 1721 return np; 1722 } 1723 EXPORT_SYMBOL(of_find_all_nodes); 1724 1725 /** 1726 * of_get_parent - Get a node's parent if any 1727 * @node: Node to get parent 1728 * 1729 * Returns a node pointer with refcount incremented, use 1730 * of_node_put() on it when done. 1731 */ 1732 struct device_node *of_get_parent(const struct device_node *node) 1733 { 1734 struct device_node *np; 1735 1736 if (!node) 1737 return NULL; 1738 1739 read_lock(&devtree_lock); 1740 np = of_node_get(node->parent); 1741 read_unlock(&devtree_lock); 1742 return np; 1743 } 1744 EXPORT_SYMBOL(of_get_parent); 1745 1746 /** 1747 * of_get_next_child - Iterate a node childs 1748 * @node: parent node 1749 * @prev: previous child of the parent node, or NULL to get first 1750 * 1751 * Returns a node pointer with refcount incremented, use 1752 * of_node_put() on it when done. 1753 */ 1754 struct device_node *of_get_next_child(const struct device_node *node, 1755 struct device_node *prev) 1756 { 1757 struct device_node *next; 1758 1759 read_lock(&devtree_lock); 1760 next = prev ? prev->sibling : node->child; 1761 for (; next != 0; next = next->sibling) 1762 if (of_node_get(next)) 1763 break; 1764 if (prev) 1765 of_node_put(prev); 1766 read_unlock(&devtree_lock); 1767 return next; 1768 } 1769 EXPORT_SYMBOL(of_get_next_child); 1770 1771 /** 1772 * of_node_get - Increment refcount of a node 1773 * @node: Node to inc refcount, NULL is supported to 1774 * simplify writing of callers 1775 * 1776 * Returns node. 1777 */ 1778 struct device_node *of_node_get(struct device_node *node) 1779 { 1780 if (node) 1781 kref_get(&node->kref); 1782 return node; 1783 } 1784 EXPORT_SYMBOL(of_node_get); 1785 1786 static inline struct device_node * kref_to_device_node(struct kref *kref) 1787 { 1788 return container_of(kref, struct device_node, kref); 1789 } 1790 1791 /** 1792 * of_node_release - release a dynamically allocated node 1793 * @kref: kref element of the node to be released 1794 * 1795 * In of_node_put() this function is passed to kref_put() 1796 * as the destructor. 1797 */ 1798 static void of_node_release(struct kref *kref) 1799 { 1800 struct device_node *node = kref_to_device_node(kref); 1801 struct property *prop = node->properties; 1802 1803 if (!OF_IS_DYNAMIC(node)) 1804 return; 1805 while (prop) { 1806 struct property *next = prop->next; 1807 kfree(prop->name); 1808 kfree(prop->value); 1809 kfree(prop); 1810 prop = next; 1811 } 1812 kfree(node->intrs); 1813 kfree(node->addrs); 1814 kfree(node->full_name); 1815 kfree(node->data); 1816 kfree(node); 1817 } 1818 1819 /** 1820 * of_node_put - Decrement refcount of a node 1821 * @node: Node to dec refcount, NULL is supported to 1822 * simplify writing of callers 1823 * 1824 */ 1825 void of_node_put(struct device_node *node) 1826 { 1827 if (node) 1828 kref_put(&node->kref, of_node_release); 1829 } 1830 EXPORT_SYMBOL(of_node_put); 1831 1832 /* 1833 * Plug a device node into the tree and global list. 1834 */ 1835 void of_attach_node(struct device_node *np) 1836 { 1837 write_lock(&devtree_lock); 1838 np->sibling = np->parent->child; 1839 np->allnext = allnodes; 1840 np->parent->child = np; 1841 allnodes = np; 1842 write_unlock(&devtree_lock); 1843 } 1844 1845 /* 1846 * "Unplug" a node from the device tree. The caller must hold 1847 * a reference to the node. The memory associated with the node 1848 * is not freed until its refcount goes to zero. 1849 */ 1850 void of_detach_node(const struct device_node *np) 1851 { 1852 struct device_node *parent; 1853 1854 write_lock(&devtree_lock); 1855 1856 parent = np->parent; 1857 1858 if (allnodes == np) 1859 allnodes = np->allnext; 1860 else { 1861 struct device_node *prev; 1862 for (prev = allnodes; 1863 prev->allnext != np; 1864 prev = prev->allnext) 1865 ; 1866 prev->allnext = np->allnext; 1867 } 1868 1869 if (parent->child == np) 1870 parent->child = np->sibling; 1871 else { 1872 struct device_node *prevsib; 1873 for (prevsib = np->parent->child; 1874 prevsib->sibling != np; 1875 prevsib = prevsib->sibling) 1876 ; 1877 prevsib->sibling = np->sibling; 1878 } 1879 1880 write_unlock(&devtree_lock); 1881 } 1882 1883 #ifdef CONFIG_PPC_PSERIES 1884 /* 1885 * Fix up the uninitialized fields in a new device node: 1886 * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields 1887 * 1888 * A lot of boot-time code is duplicated here, because functions such 1889 * as finish_node_interrupts, interpret_pci_props, etc. cannot use the 1890 * slab allocator. 1891 * 1892 * This should probably be split up into smaller chunks. 1893 */ 1894 1895 static int of_finish_dynamic_node(struct device_node *node, 1896 unsigned long *unused1, int unused2, 1897 int unused3, int unused4) 1898 { 1899 struct device_node *parent = of_get_parent(node); 1900 int err = 0; 1901 phandle *ibm_phandle; 1902 1903 node->name = get_property(node, "name", NULL); 1904 node->type = get_property(node, "device_type", NULL); 1905 1906 if (!parent) { 1907 err = -ENODEV; 1908 goto out; 1909 } 1910 1911 /* We don't support that function on PowerMac, at least 1912 * not yet 1913 */ 1914 if (systemcfg->platform == PLATFORM_POWERMAC) 1915 return -ENODEV; 1916 1917 /* fix up new node's linux_phandle field */ 1918 if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL))) 1919 node->linux_phandle = *ibm_phandle; 1920 1921 out: 1922 of_node_put(parent); 1923 return err; 1924 } 1925 1926 static int prom_reconfig_notifier(struct notifier_block *nb, 1927 unsigned long action, void *node) 1928 { 1929 int err; 1930 1931 switch (action) { 1932 case PSERIES_RECONFIG_ADD: 1933 err = finish_node(node, NULL, of_finish_dynamic_node, 0, 0, 0); 1934 if (err < 0) { 1935 printk(KERN_ERR "finish_node returned %d\n", err); 1936 err = NOTIFY_BAD; 1937 } 1938 break; 1939 default: 1940 err = NOTIFY_DONE; 1941 break; 1942 } 1943 return err; 1944 } 1945 1946 static struct notifier_block prom_reconfig_nb = { 1947 .notifier_call = prom_reconfig_notifier, 1948 .priority = 10, /* This one needs to run first */ 1949 }; 1950 1951 static int __init prom_reconfig_setup(void) 1952 { 1953 return pSeries_reconfig_notifier_register(&prom_reconfig_nb); 1954 } 1955 __initcall(prom_reconfig_setup); 1956 #endif 1957 1958 /* 1959 * Find a property with a given name for a given node 1960 * and return the value. 1961 */ 1962 unsigned char *get_property(struct device_node *np, const char *name, 1963 int *lenp) 1964 { 1965 struct property *pp; 1966 1967 for (pp = np->properties; pp != 0; pp = pp->next) 1968 if (strcmp(pp->name, name) == 0) { 1969 if (lenp != 0) 1970 *lenp = pp->length; 1971 return pp->value; 1972 } 1973 return NULL; 1974 } 1975 EXPORT_SYMBOL(get_property); 1976 1977 /* 1978 * Add a property to a node 1979 */ 1980 void prom_add_property(struct device_node* np, struct property* prop) 1981 { 1982 struct property **next = &np->properties; 1983 1984 prop->next = NULL; 1985 while (*next) 1986 next = &(*next)->next; 1987 *next = prop; 1988 } 1989 1990 /* I quickly hacked that one, check against spec ! */ 1991 static inline unsigned long 1992 bus_space_to_resource_flags(unsigned int bus_space) 1993 { 1994 u8 space = (bus_space >> 24) & 0xf; 1995 if (space == 0) 1996 space = 0x02; 1997 if (space == 0x02) 1998 return IORESOURCE_MEM; 1999 else if (space == 0x01) 2000 return IORESOURCE_IO; 2001 else { 2002 printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n", 2003 bus_space); 2004 return 0; 2005 } 2006 } 2007 2008 static struct resource *find_parent_pci_resource(struct pci_dev* pdev, 2009 struct address_range *range) 2010 { 2011 unsigned long mask; 2012 int i; 2013 2014 /* Check this one */ 2015 mask = bus_space_to_resource_flags(range->space); 2016 for (i=0; i<DEVICE_COUNT_RESOURCE; i++) { 2017 if ((pdev->resource[i].flags & mask) == mask && 2018 pdev->resource[i].start <= range->address && 2019 pdev->resource[i].end > range->address) { 2020 if ((range->address + range->size - 1) > pdev->resource[i].end) { 2021 /* Add better message */ 2022 printk(KERN_WARNING "PCI/OF resource overlap !\n"); 2023 return NULL; 2024 } 2025 break; 2026 } 2027 } 2028 if (i == DEVICE_COUNT_RESOURCE) 2029 return NULL; 2030 return &pdev->resource[i]; 2031 } 2032 2033 /* 2034 * Request an OF device resource. Currently handles child of PCI devices, 2035 * or other nodes attached to the root node. Ultimately, put some 2036 * link to resources in the OF node. 2037 */ 2038 struct resource *request_OF_resource(struct device_node* node, int index, 2039 const char* name_postfix) 2040 { 2041 struct pci_dev* pcidev; 2042 u8 pci_bus, pci_devfn; 2043 unsigned long iomask; 2044 struct device_node* nd; 2045 struct resource* parent; 2046 struct resource *res = NULL; 2047 int nlen, plen; 2048 2049 if (index >= node->n_addrs) 2050 goto fail; 2051 2052 /* Sanity check on bus space */ 2053 iomask = bus_space_to_resource_flags(node->addrs[index].space); 2054 if (iomask & IORESOURCE_MEM) 2055 parent = &iomem_resource; 2056 else if (iomask & IORESOURCE_IO) 2057 parent = &ioport_resource; 2058 else 2059 goto fail; 2060 2061 /* Find a PCI parent if any */ 2062 nd = node; 2063 pcidev = NULL; 2064 while (nd) { 2065 if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) 2066 pcidev = pci_find_slot(pci_bus, pci_devfn); 2067 if (pcidev) break; 2068 nd = nd->parent; 2069 } 2070 if (pcidev) 2071 parent = find_parent_pci_resource(pcidev, &node->addrs[index]); 2072 if (!parent) { 2073 printk(KERN_WARNING "request_OF_resource(%s), parent not found\n", 2074 node->name); 2075 goto fail; 2076 } 2077 2078 res = __request_region(parent, node->addrs[index].address, 2079 node->addrs[index].size, NULL); 2080 if (!res) 2081 goto fail; 2082 nlen = strlen(node->name); 2083 plen = name_postfix ? strlen(name_postfix) : 0; 2084 res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL); 2085 if (res->name) { 2086 strcpy((char *)res->name, node->name); 2087 if (plen) 2088 strcpy((char *)res->name+nlen, name_postfix); 2089 } 2090 return res; 2091 fail: 2092 return NULL; 2093 } 2094 EXPORT_SYMBOL(request_OF_resource); 2095 2096 int release_OF_resource(struct device_node *node, int index) 2097 { 2098 struct pci_dev* pcidev; 2099 u8 pci_bus, pci_devfn; 2100 unsigned long iomask, start, end; 2101 struct device_node* nd; 2102 struct resource* parent; 2103 struct resource *res = NULL; 2104 2105 if (index >= node->n_addrs) 2106 return -EINVAL; 2107 2108 /* Sanity check on bus space */ 2109 iomask = bus_space_to_resource_flags(node->addrs[index].space); 2110 if (iomask & IORESOURCE_MEM) 2111 parent = &iomem_resource; 2112 else if (iomask & IORESOURCE_IO) 2113 parent = &ioport_resource; 2114 else 2115 return -EINVAL; 2116 2117 /* Find a PCI parent if any */ 2118 nd = node; 2119 pcidev = NULL; 2120 while(nd) { 2121 if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) 2122 pcidev = pci_find_slot(pci_bus, pci_devfn); 2123 if (pcidev) break; 2124 nd = nd->parent; 2125 } 2126 if (pcidev) 2127 parent = find_parent_pci_resource(pcidev, &node->addrs[index]); 2128 if (!parent) { 2129 printk(KERN_WARNING "release_OF_resource(%s), parent not found\n", 2130 node->name); 2131 return -ENODEV; 2132 } 2133 2134 /* Find us in the parent and its childs */ 2135 res = parent->child; 2136 start = node->addrs[index].address; 2137 end = start + node->addrs[index].size - 1; 2138 while (res) { 2139 if (res->start == start && res->end == end && 2140 (res->flags & IORESOURCE_BUSY)) 2141 break; 2142 if (res->start <= start && res->end >= end) 2143 res = res->child; 2144 else 2145 res = res->sibling; 2146 } 2147 if (!res) 2148 return -ENODEV; 2149 2150 if (res->name) { 2151 kfree(res->name); 2152 res->name = NULL; 2153 } 2154 release_resource(res); 2155 kfree(res); 2156 2157 return 0; 2158 } 2159 EXPORT_SYMBOL(release_OF_resource); 2160