arch/sparc/kernel/prom_64.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   4  * Paul Mackerras       August 1996.
   5  * Copyright (C) 1996-2005 Paul Mackerras.
   6  *
   7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   8  *    {engebret|bergner}@us.ibm.com
   9  *
  10  *  Adapted for sparc64 by David S. Miller davem@davemloft.net
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/module.h>
  23 #include <linux/lmb.h>
  24 #include <linux/of_device.h>
  25
  26 #include <asm/prom.h>
  27 #include <asm/oplib.h>
  28 #include <asm/irq.h>
  29 #include <asm/asi.h>
  30 #include <asm/upa.h>
  31 #include <asm/smp.h>
  32
  33 #include "prom.h"
  34
  35 static unsigned int prom_early_allocated __initdata;
  36
  37 void * __init prom_early_alloc(unsigned long size)
  38 {
  39         unsigned long paddr = lmb_alloc(size, SMP_CACHE_BYTES);
  40         void *ret;
  41
  42         if (!paddr) {
  43                 prom_printf("prom_early_alloc(%lu) failed\n");
  44                 prom_halt();
  45         }
  46
  47         ret = __va(paddr);
  48         memset(ret, 0, size);
  49         prom_early_allocated += size;
  50
  51         return ret;
  52 }
  53
  54 static int is_root_node(const struct device_node *dp)
  55 {
  56         if (!dp)
  57                 return 0;
  58
  59         return (dp->parent == NULL);
  60 }
  61
  62 /* The following routines deal with the black magic of fully naming a
  63  * node.
  64  *
  65  * Certain well known named nodes are just the simple name string.
  66  *
  67  * Actual devices have an address specifier appended to the base name
  68  * string, like this "foo@addr".  The "addr" can be in any number of
  69  * formats, and the platform plus the type of the node determine the
  70  * format and how it is constructed.
  71  *
  72  * For children of the ROOT node, the naming convention is fixed and
  73  * determined by whether this is a sun4u or sun4v system.
  74  *
  75  * For children of other nodes, it is bus type specific.  So
  76  * we walk up the tree until we discover a "device_type" property
  77  * we recognize and we go from there.
  78  *
  79  * As an example, the boot device on my workstation has a full path:
  80  *
  81  *      /pci@1e,600000/ide@d/disk@0,0:c
  82  */
  83 static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
  84 {
  85         struct linux_prom64_registers *regs;
  86         struct property *rprop;
  87         u32 high_bits, low_bits, type;
  88
  89         rprop = of_find_property(dp, "reg", NULL);
  90         if (!rprop)
  91                 return;
  92
  93         regs = rprop->value;
  94         if (!is_root_node(dp->parent)) {
  95                 sprintf(tmp_buf, "%s@%x,%x",
  96                         dp->name,
  97                         (unsigned int) (regs->phys_addr >> 32UL),
  98                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
  99                 return;
 100         }
 101
 102         type = regs->phys_addr >> 60UL;
 103         high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
 104         low_bits = (regs->phys_addr & 0xffffffffUL);
 105
 106         if (type == 0 || type == 8) {
 107                 const char *prefix = (type == 0) ? "m" : "i";
 108
 109                 if (low_bits)
 110                         sprintf(tmp_buf, "%s@%s%x,%x",
 111                                 dp->name, prefix,
 112                                 high_bits, low_bits);
 113                 else
 114                         sprintf(tmp_buf, "%s@%s%x",
 115                                 dp->name,
 116                                 prefix,
 117                                 high_bits);
 118         } else if (type == 12) {
 119                 sprintf(tmp_buf, "%s@%x",
 120                         dp->name, high_bits);
 121         }
 122 }
 123
 124 static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 125 {
 126         struct linux_prom64_registers *regs;
 127         struct property *prop;
 128
 129         prop = of_find_property(dp, "reg", NULL);
 130         if (!prop)
 131                 return;
 132
 133         regs = prop->value;
 134         if (!is_root_node(dp->parent)) {
 135                 sprintf(tmp_buf, "%s@%x,%x",
 136                         dp->name,
 137                         (unsigned int) (regs->phys_addr >> 32UL),
 138                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
 139                 return;
 140         }
 141
 142         prop = of_find_property(dp, "upa-portid", NULL);
 143         if (!prop)
 144                 prop = of_find_property(dp, "portid", NULL);
 145         if (prop) {
 146                 unsigned long mask = 0xffffffffUL;
 147
 148                 if (tlb_type >= cheetah)
 149                         mask = 0x7fffff;
 150
 151                 sprintf(tmp_buf, "%s@%x,%x",
 152                         dp->name,
 153                         *(u32 *)prop->value,
 154                         (unsigned int) (regs->phys_addr & mask));
 155         }
 156 }
 157
 158 /* "name@slot,offset"  */
 159 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 160 {
 161         struct linux_prom_registers *regs;
 162         struct property *prop;
 163
 164         prop = of_find_property(dp, "reg", NULL);
 165         if (!prop)
 166                 return;
 167
 168         regs = prop->value;
 169         sprintf(tmp_buf, "%s@%x,%x",
 170                 dp->name,
 171                 regs->which_io,
 172                 regs->phys_addr);
 173 }
 174
 175 /* "name@devnum[,func]" */
 176 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 177 {
 178         struct linux_prom_pci_registers *regs;
 179         struct property *prop;
 180         unsigned int devfn;
 181
 182         prop = of_find_property(dp, "reg", NULL);
 183         if (!prop)
 184                 return;
 185
 186         regs = prop->value;
 187         devfn = (regs->phys_hi >> 8) & 0xff;
 188         if (devfn & 0x07) {
 189                 sprintf(tmp_buf, "%s@%x,%x",
 190                         dp->name,
 191                         devfn >> 3,
 192                         devfn & 0x07);
 193         } else {
 194                 sprintf(tmp_buf, "%s@%x",
 195                         dp->name,
 196                         devfn >> 3);
 197         }
 198 }
 199
 200 /* "name@UPA_PORTID,offset" */
 201 static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 202 {
 203         struct linux_prom64_registers *regs;
 204         struct property *prop;
 205
 206         prop = of_find_property(dp, "reg", NULL);
 207         if (!prop)
 208                 return;
 209
 210         regs = prop->value;
 211
 212         prop = of_find_property(dp, "upa-portid", NULL);
 213         if (!prop)
 214                 return;
 215
 216         sprintf(tmp_buf, "%s@%x,%x",
 217                 dp->name,
 218                 *(u32 *) prop->value,
 219                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 220 }
 221
 222 /* "name@reg" */
 223 static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
 224 {
 225         struct property *prop;
 226         u32 *regs;
 227
 228         prop = of_find_property(dp, "reg", NULL);
 229         if (!prop)
 230                 return;
 231
 232         regs = prop->value;
 233
 234         sprintf(tmp_buf, "%s@%x", dp->name, *regs);
 235 }
 236
 237 /* "name@addrhi,addrlo" */
 238 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 239 {
 240         struct linux_prom64_registers *regs;
 241         struct property *prop;
 242
 243         prop = of_find_property(dp, "reg", NULL);
 244         if (!prop)
 245                 return;
 246
 247         regs = prop->value;
 248
 249         sprintf(tmp_buf, "%s@%x,%x",
 250                 dp->name,
 251                 (unsigned int) (regs->phys_addr >> 32UL),
 252                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 253 }
 254
 255 /* "name@bus,addr" */
 256 static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
 257 {
 258         struct property *prop;
 259         u32 *regs;
 260
 261         prop = of_find_property(dp, "reg", NULL);
 262         if (!prop)
 263                 return;
 264
 265         regs = prop->value;
 266
 267         /* This actually isn't right... should look at the #address-cells
 268          * property of the i2c bus node etc. etc.
 269          */
 270         sprintf(tmp_buf, "%s@%x,%x",
 271                 dp->name, regs[0], regs[1]);
 272 }
 273
 274 /* "name@reg0[,reg1]" */
 275 static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
 276 {
 277         struct property *prop;
 278         u32 *regs;
 279
 280         prop = of_find_property(dp, "reg", NULL);
 281         if (!prop)
 282                 return;
 283
 284         regs = prop->value;
 285
 286         if (prop->length == sizeof(u32) || regs[1] == 1) {
 287                 sprintf(tmp_buf, "%s@%x",
 288                         dp->name, regs[0]);
 289         } else {
 290                 sprintf(tmp_buf, "%s@%x,%x",
 291                         dp->name, regs[0], regs[1]);
 292         }
 293 }
 294
 295 /* "name@reg0reg1[,reg2reg3]" */
 296 static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
 297 {
 298         struct property *prop;
 299         u32 *regs;
 300
 301         prop = of_find_property(dp, "reg", NULL);
 302         if (!prop)
 303                 return;
 304
 305         regs = prop->value;
 306
 307         if (regs[2] || regs[3]) {
 308                 sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
 309                         dp->name, regs[0], regs[1], regs[2], regs[3]);
 310         } else {
 311                 sprintf(tmp_buf, "%s@%08x%08x",
 312                         dp->name, regs[0], regs[1]);
 313         }
 314 }
 315
 316 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 317 {
 318         struct device_node *parent = dp->parent;
 319
 320         if (parent != NULL) {
 321                 if (!strcmp(parent->type, "pci") ||
 322                     !strcmp(parent->type, "pciex")) {
 323                         pci_path_component(dp, tmp_buf);
 324                         return;
 325                 }
 326                 if (!strcmp(parent->type, "sbus")) {
 327                         sbus_path_component(dp, tmp_buf);
 328                         return;
 329                 }
 330                 if (!strcmp(parent->type, "upa")) {
 331                         upa_path_component(dp, tmp_buf);
 332                         return;
 333                 }
 334                 if (!strcmp(parent->type, "ebus")) {
 335                         ebus_path_component(dp, tmp_buf);
 336                         return;
 337                 }
 338                 if (!strcmp(parent->name, "usb") ||
 339                     !strcmp(parent->name, "hub")) {
 340                         usb_path_component(dp, tmp_buf);
 341                         return;
 342                 }
 343                 if (!strcmp(parent->type, "i2c")) {
 344                         i2c_path_component(dp, tmp_buf);
 345                         return;
 346                 }
 347                 if (!strcmp(parent->type, "firewire")) {
 348                         ieee1394_path_component(dp, tmp_buf);
 349                         return;
 350                 }
 351                 if (!strcmp(parent->type, "virtual-devices")) {
 352                         vdev_path_component(dp, tmp_buf);
 353                         return;
 354                 }
 355                 /* "isa" is handled with platform naming */
 356         }
 357
 358         /* Use platform naming convention.  */
 359         if (tlb_type == hypervisor) {
 360                 sun4v_path_component(dp, tmp_buf);
 361                 return;
 362         } else {
 363                 sun4u_path_component(dp, tmp_buf);
 364         }
 365 }
 366
 367 static char * __init build_path_component(struct device_node *dp)
 368 {
 369         char tmp_buf[64], *n;
 370
 371         tmp_buf[0] = '\0';
 372         __build_path_component(dp, tmp_buf);
 373         if (tmp_buf[0] == '\0')
 374                 strcpy(tmp_buf, dp->name);
 375
 376         n = prom_early_alloc(strlen(tmp_buf) + 1);
 377         strcpy(n, tmp_buf);
 378
 379         return n;
 380 }
 381
 382 static char * __init build_full_name(struct device_node *dp)
 383 {
 384         int len, ourlen, plen;
 385         char *n;
 386
 387         plen = strlen(dp->parent->full_name);
 388         ourlen = strlen(dp->path_component_name);
 389         len = ourlen + plen + 2;
 390
 391         n = prom_early_alloc(len);
 392         strcpy(n, dp->parent->full_name);
 393         if (!is_root_node(dp->parent)) {
 394                 strcpy(n + plen, "/");
 395                 plen++;
 396         }
 397         strcpy(n + plen, dp->path_component_name);
 398
 399         return n;
 400 }
 401
 402 static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
 403 {
 404         struct device_node *ret = NULL, *prev_sibling = NULL;
 405         struct device_node *dp;
 406
 407         while (1) {
 408                 dp = create_node(node, parent);
 409                 if (!dp)
 410                         break;
 411
 412                 if (prev_sibling)
 413                         prev_sibling->sibling = dp;
 414
 415                 if (!ret)
 416                         ret = dp;
 417                 prev_sibling = dp;
 418
 419                 *(*nextp) = dp;
 420                 *nextp = &dp->allnext;
 421
 422                 dp->path_component_name = build_path_component(dp);
 423                 dp->full_name = build_full_name(dp);
 424
 425                 dp->child = build_tree(dp, prom_getchild(node), nextp);
 426
 427                 node = prom_getsibling(node);
 428         }
 429
 430         return ret;
 431 }
 432
 433 static const char *get_mid_prop(void)
 434 {
 435         return (tlb_type == spitfire ? "upa-portid" : "portid");
 436 }
 437
 438 struct device_node *of_find_node_by_cpuid(int cpuid)
 439 {
 440         struct device_node *dp;
 441         const char *mid_prop = get_mid_prop();
 442
 443         for_each_node_by_type(dp, "cpu") {
 444                 int id = of_getintprop_default(dp, mid_prop, -1);
 445                 const char *this_mid_prop = mid_prop;
 446
 447                 if (id < 0) {
 448                         this_mid_prop = "cpuid";
 449                         id = of_getintprop_default(dp, this_mid_prop, -1);
 450                 }
 451
 452                 if (id < 0) {
 453                         prom_printf("OF: Serious problem, cpu lacks "
 454                                     "%s property", this_mid_prop);
 455                         prom_halt();
 456                 }
 457                 if (cpuid == id)
 458                         return dp;
 459         }
 460         return NULL;
 461 }
 462
 463 static void __init of_fill_in_cpu_data(void)
 464 {
 465         struct device_node *dp;
 466         const char *mid_prop = get_mid_prop();
 467
 468         ncpus_probed = 0;
 469         for_each_node_by_type(dp, "cpu") {
 470                 int cpuid = of_getintprop_default(dp, mid_prop, -1);
 471                 const char *this_mid_prop = mid_prop;
 472                 struct device_node *portid_parent;
 473                 int portid = -1;
 474
 475                 portid_parent = NULL;
 476                 if (cpuid < 0) {
 477                         this_mid_prop = "cpuid";
 478                         cpuid = of_getintprop_default(dp, this_mid_prop, -1);
 479                         if (cpuid >= 0) {
 480                                 int limit = 2;
 481
 482                                 portid_parent = dp;
 483                                 while (limit--) {
 484                                         portid_parent = portid_parent->parent;
 485                                         if (!portid_parent)
 486                                                 break;
 487                                         portid = of_getintprop_default(portid_parent,
 488                                                                        "portid", -1);
 489                                         if (portid >= 0)
 490                                                 break;
 491                                 }
 492                         }
 493                 }
 494
 495                 if (cpuid < 0) {
 496                         prom_printf("OF: Serious problem, cpu lacks "
 497                                     "%s property", this_mid_prop);
 498                         prom_halt();
 499                 }
 500
 501                 ncpus_probed++;
 502
 503 #ifdef CONFIG_SMP
 504                 if (cpuid >= NR_CPUS) {
 505                         printk(KERN_WARNING "Ignoring CPU %d which is "
 506                                ">= NR_CPUS (%d)\n",
 507                                cpuid, NR_CPUS);
 508                         continue;
 509                 }
 510 #else
 511                 /* On uniprocessor we only want the values for the
 512                  * real physical cpu the kernel booted onto, however
 513                  * cpu_data() only has one entry at index 0.
 514                  */
 515                 if (cpuid != real_hard_smp_processor_id())
 516                         continue;
 517                 cpuid = 0;
 518 #endif
 519
 520                 cpu_data(cpuid).clock_tick =
 521                         of_getintprop_default(dp, "clock-frequency", 0);
 522
 523                 if (portid_parent) {
 524                         cpu_data(cpuid).dcache_size =
 525                                 of_getintprop_default(dp, "l1-dcache-size",
 526                                                       16 * 1024);
 527                         cpu_data(cpuid).dcache_line_size =
 528                                 of_getintprop_default(dp, "l1-dcache-line-size",
 529                                                       32);
 530                         cpu_data(cpuid).icache_size =
 531                                 of_getintprop_default(dp, "l1-icache-size",
 532                                                       8 * 1024);
 533                         cpu_data(cpuid).icache_line_size =
 534                                 of_getintprop_default(dp, "l1-icache-line-size",
 535                                                       32);
 536                         cpu_data(cpuid).ecache_size =
 537                                 of_getintprop_default(dp, "l2-cache-size", 0);
 538                         cpu_data(cpuid).ecache_line_size =
 539                                 of_getintprop_default(dp, "l2-cache-line-size", 0);
 540                         if (!cpu_data(cpuid).ecache_size ||
 541                             !cpu_data(cpuid).ecache_line_size) {
 542                                 cpu_data(cpuid).ecache_size =
 543                                         of_getintprop_default(portid_parent,
 544                                                               "l2-cache-size",
 545                                                               (4 * 1024 * 1024));
 546                                 cpu_data(cpuid).ecache_line_size =
 547                                         of_getintprop_default(portid_parent,
 548                                                               "l2-cache-line-size", 64);
 549                         }
 550
 551                         cpu_data(cpuid).core_id = portid + 1;
 552                         cpu_data(cpuid).proc_id = portid;
 553 #ifdef CONFIG_SMP
 554                         sparc64_multi_core = 1;
 555 #endif
 556                 } else {
 557                         cpu_data(cpuid).dcache_size =
 558                                 of_getintprop_default(dp, "dcache-size", 16 * 1024);
 559                         cpu_data(cpuid).dcache_line_size =
 560                                 of_getintprop_default(dp, "dcache-line-size", 32);
 561
 562                         cpu_data(cpuid).icache_size =
 563                                 of_getintprop_default(dp, "icache-size", 16 * 1024);
 564                         cpu_data(cpuid).icache_line_size =
 565                                 of_getintprop_default(dp, "icache-line-size", 32);
 566
 567                         cpu_data(cpuid).ecache_size =
 568                                 of_getintprop_default(dp, "ecache-size",
 569                                                       (4 * 1024 * 1024));
 570                         cpu_data(cpuid).ecache_line_size =
 571                                 of_getintprop_default(dp, "ecache-line-size", 64);
 572
 573                         cpu_data(cpuid).core_id = 0;
 574                         cpu_data(cpuid).proc_id = -1;
 575                 }
 576
 577 #ifdef CONFIG_SMP
 578                 cpu_set(cpuid, cpu_present_map);
 579                 cpu_set(cpuid, cpu_possible_map);
 580 #endif
 581         }
 582
 583         smp_fill_in_sib_core_maps();
 584 }
 585
 586 struct device_node *of_console_device;
 587 EXPORT_SYMBOL(of_console_device);
 588
 589 char *of_console_path;
 590 EXPORT_SYMBOL(of_console_path);
 591
 592 char *of_console_options;
 593 EXPORT_SYMBOL(of_console_options);
 594
 595 static void __init of_console_init(void)
 596 {
 597         char *msg = "OF stdout device is: %s\n";
 598         struct device_node *dp;
 599         const char *type;
 600         phandle node;
 601
 602         of_console_path = prom_early_alloc(256);
 603         if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
 604                 prom_printf("Cannot obtain path of stdout.\n");
 605                 prom_halt();
 606         }
 607         of_console_options = strrchr(of_console_path, ':');
 608         if (of_console_options) {
 609                 of_console_options++;
 610                 if (*of_console_options == '\0')
 611                         of_console_options = NULL;
 612         }
 613
 614         node = prom_inst2pkg(prom_stdout);
 615         if (!node) {
 616                 prom_printf("Cannot resolve stdout node from "
 617                             "instance %08x.\n", prom_stdout);
 618                 prom_halt();
 619         }
 620
 621         dp = of_find_node_by_phandle(node);
 622         type = of_get_property(dp, "device_type", NULL);
 623         if (!type) {
 624                 prom_printf("Console stdout lacks device_type property.\n");
 625                 prom_halt();
 626         }
 627
 628         if (strcmp(type, "display") && strcmp(type, "serial")) {
 629                 prom_printf("Console device_type is neither display "
 630                             "nor serial.\n");
 631                 prom_halt();
 632         }
 633
 634         of_console_device = dp;
 635
 636         printk(msg, of_console_path);
 637 }
 638
 639 void __init prom_build_devicetree(void)
 640 {
 641         struct device_node **nextp;
 642
 643         allnodes = create_node(prom_root_node, NULL);
 644         allnodes->path_component_name = "";
 645         allnodes->full_name = "/";
 646
 647         nextp = &allnodes->allnext;
 648         allnodes->child = build_tree(allnodes,
 649                                      prom_getchild(allnodes->node),
 650                                      &nextp);
 651         of_console_init();
 652
 653         printk("PROM: Built device tree with %u bytes of memory.\n",
 654                prom_early_allocated);
 655
 656         if (tlb_type != hypervisor)
 657                 of_fill_in_cpu_data();
 658 }