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