arch/sparc/kernel/prom_64.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Procedures for creating, accessing and interpreting the device tree.
   4  *
   5  * Paul Mackerras       August 1996.
   6  * Copyright (C) 1996-2005 Paul Mackerras.
   7  *
   8  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   9  *    {engebret|bergner}@us.ibm.com
  10  *
  11  *  Adapted for sparc64 by David S. Miller davem@davemloft.net
  12  */
  13
  14 #include <linux/memblock.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18 #include <linux/cpu.h>
  19 #include <linux/mm.h>
  20 #include <linux/of.h>
  21
  22 #include <asm/prom.h>
  23 #include <asm/oplib.h>
  24 #include <asm/irq.h>
  25 #include <asm/asi.h>
  26 #include <asm/upa.h>
  27 #include <asm/smp.h>
  28
  29 #include "prom.h"
  30
  31 void * __init prom_early_alloc(unsigned long size)
  32 {
  33         void *ret = memblock_alloc(size, SMP_CACHE_BYTES);
  34
  35         if (!ret) {
  36                 prom_printf("prom_early_alloc(%lu) failed\n", size);
  37                 prom_halt();
  38         }
  39
  40         prom_early_allocated += size;
  41
  42         return ret;
  43 }
  44
  45 /* The following routines deal with the black magic of fully naming a
  46  * node.
  47  *
  48  * Certain well known named nodes are just the simple name string.
  49  *
  50  * Actual devices have an address specifier appended to the base name
  51  * string, like this "foo@addr".  The "addr" can be in any number of
  52  * formats, and the platform plus the type of the node determine the
  53  * format and how it is constructed.
  54  *
  55  * For children of the ROOT node, the naming convention is fixed and
  56  * determined by whether this is a sun4u or sun4v system.
  57  *
  58  * For children of other nodes, it is bus type specific.  So
  59  * we walk up the tree until we discover a "device_type" property
  60  * we recognize and we go from there.
  61  *
  62  * As an example, the boot device on my workstation has a full path:
  63  *
  64  *      /pci@1e,600000/ide@d/disk@0,0:c
  65  */
  66 static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
  67 {
  68         const char *name = of_get_property(dp, "name", NULL);
  69         struct linux_prom64_registers *regs;
  70         struct property *rprop;
  71         u32 high_bits, low_bits, type;
  72
  73         rprop = of_find_property(dp, "reg", NULL);
  74         if (!rprop)
  75                 return;
  76
  77         regs = rprop->value;
  78         if (!of_node_is_root(dp->parent)) {
  79                 sprintf(tmp_buf, "%s@%x,%x",
  80                         name,
  81                         (unsigned int) (regs->phys_addr >> 32UL),
  82                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
  83                 return;
  84         }
  85
  86         type = regs->phys_addr >> 60UL;
  87         high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
  88         low_bits = (regs->phys_addr & 0xffffffffUL);
  89
  90         if (type == 0 || type == 8) {
  91                 const char *prefix = (type == 0) ? "m" : "i";
  92
  93                 if (low_bits)
  94                         sprintf(tmp_buf, "%s@%s%x,%x",
  95                                 name, prefix,
  96                                 high_bits, low_bits);
  97                 else
  98                         sprintf(tmp_buf, "%s@%s%x",
  99                                 name,
 100                                 prefix,
 101                                 high_bits);
 102         } else if (type == 12) {
 103                 sprintf(tmp_buf, "%s@%x",
 104                         name, high_bits);
 105         }
 106 }
 107
 108 static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 109 {
 110         const char *name = of_get_property(dp, "name", NULL);
 111         struct linux_prom64_registers *regs;
 112         struct property *prop;
 113
 114         prop = of_find_property(dp, "reg", NULL);
 115         if (!prop)
 116                 return;
 117
 118         regs = prop->value;
 119         if (!of_node_is_root(dp->parent)) {
 120                 sprintf(tmp_buf, "%s@%x,%x",
 121                         name,
 122                         (unsigned int) (regs->phys_addr >> 32UL),
 123                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
 124                 return;
 125         }
 126
 127         prop = of_find_property(dp, "upa-portid", NULL);
 128         if (!prop)
 129                 prop = of_find_property(dp, "portid", NULL);
 130         if (prop) {
 131                 unsigned long mask = 0xffffffffUL;
 132
 133                 if (tlb_type >= cheetah)
 134                         mask = 0x7fffff;
 135
 136                 sprintf(tmp_buf, "%s@%x,%x",
 137                         name,
 138                         *(u32 *)prop->value,
 139                         (unsigned int) (regs->phys_addr & mask));
 140         }
 141 }
 142
 143 /* "name@slot,offset"  */
 144 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 145 {
 146         const char *name = of_get_property(dp, "name", NULL);
 147         struct linux_prom_registers *regs;
 148         struct property *prop;
 149
 150         prop = of_find_property(dp, "reg", NULL);
 151         if (!prop)
 152                 return;
 153
 154         regs = prop->value;
 155         sprintf(tmp_buf, "%s@%x,%x",
 156                 name,
 157                 regs->which_io,
 158                 regs->phys_addr);
 159 }
 160
 161 /* "name@devnum[,func]" */
 162 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 163 {
 164         const char *name = of_get_property(dp, "name", NULL);
 165         struct linux_prom_pci_registers *regs;
 166         struct property *prop;
 167         unsigned int devfn;
 168
 169         prop = of_find_property(dp, "reg", NULL);
 170         if (!prop)
 171                 return;
 172
 173         regs = prop->value;
 174         devfn = (regs->phys_hi >> 8) & 0xff;
 175         if (devfn & 0x07) {
 176                 sprintf(tmp_buf, "%s@%x,%x",
 177                         name,
 178                         devfn >> 3,
 179                         devfn & 0x07);
 180         } else {
 181                 sprintf(tmp_buf, "%s@%x",
 182                         name,
 183                         devfn >> 3);
 184         }
 185 }
 186
 187 /* "name@UPA_PORTID,offset" */
 188 static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 189 {
 190         const char *name = of_get_property(dp, "name", NULL);
 191         struct linux_prom64_registers *regs;
 192         struct property *prop;
 193
 194         prop = of_find_property(dp, "reg", NULL);
 195         if (!prop)
 196                 return;
 197
 198         regs = prop->value;
 199
 200         prop = of_find_property(dp, "upa-portid", NULL);
 201         if (!prop)
 202                 return;
 203
 204         sprintf(tmp_buf, "%s@%x,%x",
 205                 name,
 206                 *(u32 *) prop->value,
 207                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 208 }
 209
 210 /* "name@reg" */
 211 static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
 212 {
 213         const char *name = of_get_property(dp, "name", NULL);
 214         struct property *prop;
 215         u32 *regs;
 216
 217         prop = of_find_property(dp, "reg", NULL);
 218         if (!prop)
 219                 return;
 220
 221         regs = prop->value;
 222
 223         sprintf(tmp_buf, "%s@%x", name, *regs);
 224 }
 225
 226 /* "name@addrhi,addrlo" */
 227 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 228 {
 229         const char *name = of_get_property(dp, "name", NULL);
 230         struct linux_prom64_registers *regs;
 231         struct property *prop;
 232
 233         prop = of_find_property(dp, "reg", NULL);
 234         if (!prop)
 235                 return;
 236
 237         regs = prop->value;
 238
 239         sprintf(tmp_buf, "%s@%x,%x",
 240                 name,
 241                 (unsigned int) (regs->phys_addr >> 32UL),
 242                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 243 }
 244
 245 /* "name@bus,addr" */
 246 static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
 247 {
 248         const char *name = of_get_property(dp, "name", NULL);
 249         struct property *prop;
 250         u32 *regs;
 251
 252         prop = of_find_property(dp, "reg", NULL);
 253         if (!prop)
 254                 return;
 255
 256         regs = prop->value;
 257
 258         /* This actually isn't right... should look at the #address-cells
 259          * property of the i2c bus node etc. etc.
 260          */
 261         sprintf(tmp_buf, "%s@%x,%x",
 262                 name, regs[0], regs[1]);
 263 }
 264
 265 /* "name@reg0[,reg1]" */
 266 static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
 267 {
 268         const char *name = of_get_property(dp, "name", NULL);
 269         struct property *prop;
 270         u32 *regs;
 271
 272         prop = of_find_property(dp, "reg", NULL);
 273         if (!prop)
 274                 return;
 275
 276         regs = prop->value;
 277
 278         if (prop->length == sizeof(u32) || regs[1] == 1) {
 279                 sprintf(tmp_buf, "%s@%x",
 280                         name, regs[0]);
 281         } else {
 282                 sprintf(tmp_buf, "%s@%x,%x",
 283                         name, regs[0], regs[1]);
 284         }
 285 }
 286
 287 /* "name@reg0reg1[,reg2reg3]" */
 288 static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
 289 {
 290         const char *name = of_get_property(dp, "name", NULL);
 291         struct property *prop;
 292         u32 *regs;
 293
 294         prop = of_find_property(dp, "reg", NULL);
 295         if (!prop)
 296                 return;
 297
 298         regs = prop->value;
 299
 300         if (regs[2] || regs[3]) {
 301                 sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
 302                         name, regs[0], regs[1], regs[2], regs[3]);
 303         } else {
 304                 sprintf(tmp_buf, "%s@%08x%08x",
 305                         name, regs[0], regs[1]);
 306         }
 307 }
 308
 309 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 310 {
 311         struct device_node *parent = dp->parent;
 312
 313         if (parent != NULL) {
 314                 if (of_node_is_type(parent, "pci") ||
 315                     of_node_is_type(parent, "pciex")) {
 316                         pci_path_component(dp, tmp_buf);
 317                         return;
 318                 }
 319                 if (of_node_is_type(parent, "sbus")) {
 320                         sbus_path_component(dp, tmp_buf);
 321                         return;
 322                 }
 323                 if (of_node_is_type(parent, "upa")) {
 324                         upa_path_component(dp, tmp_buf);
 325                         return;
 326                 }
 327                 if (of_node_is_type(parent, "ebus")) {
 328                         ebus_path_component(dp, tmp_buf);
 329                         return;
 330                 }
 331                 if (of_node_name_eq(parent, "usb") ||
 332                     of_node_name_eq(parent, "hub")) {
 333                         usb_path_component(dp, tmp_buf);
 334                         return;
 335                 }
 336                 if (of_node_is_type(parent, "i2c")) {
 337                         i2c_path_component(dp, tmp_buf);
 338                         return;
 339                 }
 340                 if (of_node_is_type(parent, "firewire")) {
 341                         ieee1394_path_component(dp, tmp_buf);
 342                         return;
 343                 }
 344                 if (of_node_is_type(parent, "virtual-devices")) {
 345                         vdev_path_component(dp, tmp_buf);
 346                         return;
 347                 }
 348                 /* "isa" is handled with platform naming */
 349         }
 350
 351         /* Use platform naming convention.  */
 352         if (tlb_type == hypervisor) {
 353                 sun4v_path_component(dp, tmp_buf);
 354                 return;
 355         } else {
 356                 sun4u_path_component(dp, tmp_buf);
 357         }
 358 }
 359
 360 char * __init build_path_component(struct device_node *dp)
 361 {
 362         const char *name = of_get_property(dp, "name", NULL);
 363         char tmp_buf[64], *n;
 364
 365         tmp_buf[0] = '\0';
 366         __build_path_component(dp, tmp_buf);
 367         if (tmp_buf[0] == '\0')
 368                 strcpy(tmp_buf, name);
 369
 370         n = prom_early_alloc(strlen(tmp_buf) + 1);
 371         strcpy(n, tmp_buf);
 372
 373         return n;
 374 }
 375
 376 static const char *get_mid_prop(void)
 377 {
 378         return (tlb_type == spitfire ? "upa-portid" : "portid");
 379 }
 380
 381 bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 382                                        int cpu, unsigned int *thread)
 383 {
 384         const char *mid_prop = get_mid_prop();
 385         int this_cpu_id;
 386
 387         /* On hypervisor based platforms we interrogate the 'reg'
 388          * property.  On everything else we look for a 'upa-portid',
 389          * 'portid', or 'cpuid' property.
 390          */
 391
 392         if (tlb_type == hypervisor) {
 393                 struct property *prop = of_find_property(cpun, "reg", NULL);
 394                 u32 *regs;
 395
 396                 if (!prop) {
 397                         pr_warn("CPU node missing reg property\n");
 398                         return false;
 399                 }
 400                 regs = prop->value;
 401                 this_cpu_id = regs[0] & 0x0fffffff;
 402         } else {
 403                 this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);
 404
 405                 if (this_cpu_id < 0) {
 406                         mid_prop = "cpuid";
 407                         this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);
 408                 }
 409                 if (this_cpu_id < 0) {
 410                         pr_warn("CPU node missing cpu ID property\n");
 411                         return false;
 412                 }
 413         }
 414         if (this_cpu_id == cpu) {
 415                 if (thread) {
 416                         int proc_id = cpu_data(cpu).proc_id;
 417
 418                         /* On sparc64, the cpu thread information is obtained
 419                          * either from OBP or the machine description.  We've
 420                          * actually probed this information already long before
 421                          * this interface gets called so instead of interrogating
 422                          * both the OF node and the MDESC again, just use what
 423                          * we discovered already.
 424                          */
 425                         if (proc_id < 0)
 426                                 proc_id = 0;
 427                         *thread = proc_id;
 428                 }
 429                 return true;
 430         }
 431         return false;
 432 }
 433
 434 static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
 435 {
 436         struct device_node *dp;
 437         const char *mid_prop;
 438
 439         mid_prop = get_mid_prop();
 440         for_each_node_by_type(dp, "cpu") {
 441                 int cpuid = of_getintprop_default(dp, mid_prop, -1);
 442                 const char *this_mid_prop = mid_prop;
 443                 void *ret;
 444
 445                 if (cpuid < 0) {
 446                         this_mid_prop = "cpuid";
 447                         cpuid = of_getintprop_default(dp, this_mid_prop, -1);
 448                 }
 449                 if (cpuid < 0) {
 450                         prom_printf("OF: Serious problem, cpu lacks "
 451                                     "%s property", this_mid_prop);
 452                         prom_halt();
 453                 }
 454 #ifdef CONFIG_SMP
 455                 if (cpuid >= NR_CPUS) {
 456                         printk(KERN_WARNING "Ignoring CPU %d which is "
 457                                ">= NR_CPUS (%d)\n",
 458                                cpuid, NR_CPUS);
 459                         continue;
 460                 }
 461 #endif
 462                 ret = func(dp, cpuid, arg);
 463                 if (ret)
 464                         return ret;
 465         }
 466         return NULL;
 467 }
 468
 469 static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
 470 {
 471         if (id == cpuid)
 472                 return dp;
 473         return NULL;
 474 }
 475
 476 struct device_node *of_find_node_by_cpuid(int cpuid)
 477 {
 478         return of_iterate_over_cpus(check_cpu_node, cpuid);
 479 }
 480
 481 static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
 482 {
 483         ncpus_probed++;
 484 #ifdef CONFIG_SMP
 485         set_cpu_present(cpuid, true);
 486         set_cpu_possible(cpuid, true);
 487 #endif
 488         return NULL;
 489 }
 490
 491 void __init of_populate_present_mask(void)
 492 {
 493         if (tlb_type == hypervisor)
 494                 return;
 495
 496         ncpus_probed = 0;
 497         of_iterate_over_cpus(record_one_cpu, 0);
 498 }
 499
 500 static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
 501 {
 502         struct device_node *portid_parent = NULL;
 503         int portid = -1;
 504
 505         if (of_find_property(dp, "cpuid", NULL)) {
 506                 int limit = 2;
 507
 508                 portid_parent = dp;
 509                 while (limit--) {
 510                         portid_parent = portid_parent->parent;
 511                         if (!portid_parent)
 512                                 break;
 513                         portid = of_getintprop_default(portid_parent,
 514                                                        "portid", -1);
 515                         if (portid >= 0)
 516                                 break;
 517                 }
 518         }
 519
 520 #ifndef CONFIG_SMP
 521         /* On uniprocessor we only want the values for the
 522          * real physical cpu the kernel booted onto, however
 523          * cpu_data() only has one entry at index 0.
 524          */
 525         if (cpuid != real_hard_smp_processor_id())
 526                 return NULL;
 527         cpuid = 0;
 528 #endif
 529
 530         cpu_data(cpuid).clock_tick =
 531                 of_getintprop_default(dp, "clock-frequency", 0);
 532
 533         if (portid_parent) {
 534                 cpu_data(cpuid).dcache_size =
 535                         of_getintprop_default(dp, "l1-dcache-size",
 536                                               16 * 1024);
 537                 cpu_data(cpuid).dcache_line_size =
 538                         of_getintprop_default(dp, "l1-dcache-line-size",
 539                                               32);
 540                 cpu_data(cpuid).icache_size =
 541                         of_getintprop_default(dp, "l1-icache-size",
 542                                               8 * 1024);
 543                 cpu_data(cpuid).icache_line_size =
 544                         of_getintprop_default(dp, "l1-icache-line-size",
 545                                               32);
 546                 cpu_data(cpuid).ecache_size =
 547                         of_getintprop_default(dp, "l2-cache-size", 0);
 548                 cpu_data(cpuid).ecache_line_size =
 549                         of_getintprop_default(dp, "l2-cache-line-size", 0);
 550                 if (!cpu_data(cpuid).ecache_size ||
 551                     !cpu_data(cpuid).ecache_line_size) {
 552                         cpu_data(cpuid).ecache_size =
 553                                 of_getintprop_default(portid_parent,
 554                                                       "l2-cache-size",
 555                                                       (4 * 1024 * 1024));
 556                         cpu_data(cpuid).ecache_line_size =
 557                                 of_getintprop_default(portid_parent,
 558                                                       "l2-cache-line-size", 64);
 559                 }
 560
 561                 cpu_data(cpuid).core_id = portid + 1;
 562                 cpu_data(cpuid).proc_id = portid;
 563         } else {
 564                 cpu_data(cpuid).dcache_size =
 565                         of_getintprop_default(dp, "dcache-size", 16 * 1024);
 566                 cpu_data(cpuid).dcache_line_size =
 567                         of_getintprop_default(dp, "dcache-line-size", 32);
 568
 569                 cpu_data(cpuid).icache_size =
 570                         of_getintprop_default(dp, "icache-size", 16 * 1024);
 571                 cpu_data(cpuid).icache_line_size =
 572                         of_getintprop_default(dp, "icache-line-size", 32);
 573
 574                 cpu_data(cpuid).ecache_size =
 575                         of_getintprop_default(dp, "ecache-size",
 576                                               (4 * 1024 * 1024));
 577                 cpu_data(cpuid).ecache_line_size =
 578                         of_getintprop_default(dp, "ecache-line-size", 64);
 579
 580                 cpu_data(cpuid).core_id = 0;
 581                 cpu_data(cpuid).proc_id = -1;
 582         }
 583
 584         return NULL;
 585 }
 586
 587 void __init of_fill_in_cpu_data(void)
 588 {
 589         if (tlb_type == hypervisor)
 590                 return;
 591
 592         of_iterate_over_cpus(fill_in_one_cpu, 0);
 593
 594         smp_fill_in_sib_core_maps();
 595 }
 596
 597 void __init of_console_init(void)
 598 {
 599         char *msg = "OF stdout device is: %s\n";
 600         struct device_node *dp;
 601         phandle node;
 602
 603         of_console_path = prom_early_alloc(256);
 604         if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
 605                 prom_printf("Cannot obtain path of stdout.\n");
 606                 prom_halt();
 607         }
 608         of_console_options = strrchr(of_console_path, ':');
 609         if (of_console_options) {
 610                 of_console_options++;
 611                 if (*of_console_options == '\0')
 612                         of_console_options = NULL;
 613         }
 614
 615         node = prom_inst2pkg(prom_stdout);
 616         if (!node) {
 617                 prom_printf("Cannot resolve stdout node from "
 618                             "instance %08x.\n", prom_stdout);
 619                 prom_halt();
 620         }
 621
 622         dp = of_find_node_by_phandle(node);
 623
 624         if (!of_node_is_type(dp, "display") && !of_node_is_type(dp, "serial")) {
 625                 prom_printf("Console device_type is neither display "
 626                             "nor serial.\n");
 627                 prom_halt();
 628         }
 629
 630         of_console_device = dp;
 631
 632         printk(msg, of_console_path);
 633 }