| 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 | void * __init prom_early_alloc(unsigned long size) |
| 36 | { |
| 37 | unsigned long paddr = lmb_alloc(size, SMP_CACHE_BYTES); |
| 38 | void *ret; |
| 39 | |
| 40 | if (!paddr) { |
| 41 | prom_printf("prom_early_alloc(%lu) failed\n"); |
| 42 | prom_halt(); |
| 43 | } |
| 44 | |
| 45 | ret = __va(paddr); |
| 46 | memset(ret, 0, size); |
| 47 | prom_early_allocated += size; |
| 48 | |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | /* The following routines deal with the black magic of fully naming a |
| 53 | * node. |
| 54 | * |
| 55 | * Certain well known named nodes are just the simple name string. |
| 56 | * |
| 57 | * Actual devices have an address specifier appended to the base name |
| 58 | * string, like this "foo@addr". The "addr" can be in any number of |
| 59 | * formats, and the platform plus the type of the node determine the |
| 60 | * format and how it is constructed. |
| 61 | * |
| 62 | * For children of the ROOT node, the naming convention is fixed and |
| 63 | * determined by whether this is a sun4u or sun4v system. |
| 64 | * |
| 65 | * For children of other nodes, it is bus type specific. So |
| 66 | * we walk up the tree until we discover a "device_type" property |
| 67 | * we recognize and we go from there. |
| 68 | * |
| 69 | * As an example, the boot device on my workstation has a full path: |
| 70 | * |
| 71 | * /pci@1e,600000/ide@d/disk@0,0:c |
| 72 | */ |
| 73 | static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf) |
| 74 | { |
| 75 | struct linux_prom64_registers *regs; |
| 76 | struct property *rprop; |
| 77 | u32 high_bits, low_bits, type; |
| 78 | |
| 79 | rprop = of_find_property(dp, "reg", NULL); |
| 80 | if (!rprop) |
| 81 | return; |
| 82 | |
| 83 | regs = rprop->value; |
| 84 | if (!is_root_node(dp->parent)) { |
| 85 | sprintf(tmp_buf, "%s@%x,%x", |
| 86 | dp->name, |
| 87 | (unsigned int) (regs->phys_addr >> 32UL), |
| 88 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| 89 | return; |
| 90 | } |
| 91 | |
| 92 | type = regs->phys_addr >> 60UL; |
| 93 | high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL; |
| 94 | low_bits = (regs->phys_addr & 0xffffffffUL); |
| 95 | |
| 96 | if (type == 0 || type == 8) { |
| 97 | const char *prefix = (type == 0) ? "m" : "i"; |
| 98 | |
| 99 | if (low_bits) |
| 100 | sprintf(tmp_buf, "%s@%s%x,%x", |
| 101 | dp->name, prefix, |
| 102 | high_bits, low_bits); |
| 103 | else |
| 104 | sprintf(tmp_buf, "%s@%s%x", |
| 105 | dp->name, |
| 106 | prefix, |
| 107 | high_bits); |
| 108 | } else if (type == 12) { |
| 109 | sprintf(tmp_buf, "%s@%x", |
| 110 | dp->name, high_bits); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf) |
| 115 | { |
| 116 | struct linux_prom64_registers *regs; |
| 117 | struct property *prop; |
| 118 | |
| 119 | prop = of_find_property(dp, "reg", NULL); |
| 120 | if (!prop) |
| 121 | return; |
| 122 | |
| 123 | regs = prop->value; |
| 124 | if (!is_root_node(dp->parent)) { |
| 125 | sprintf(tmp_buf, "%s@%x,%x", |
| 126 | dp->name, |
| 127 | (unsigned int) (regs->phys_addr >> 32UL), |
| 128 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | prop = of_find_property(dp, "upa-portid", NULL); |
| 133 | if (!prop) |
| 134 | prop = of_find_property(dp, "portid", NULL); |
| 135 | if (prop) { |
| 136 | unsigned long mask = 0xffffffffUL; |
| 137 | |
| 138 | if (tlb_type >= cheetah) |
| 139 | mask = 0x7fffff; |
| 140 | |
| 141 | sprintf(tmp_buf, "%s@%x,%x", |
| 142 | dp->name, |
| 143 | *(u32 *)prop->value, |
| 144 | (unsigned int) (regs->phys_addr & mask)); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* "name@slot,offset" */ |
| 149 | static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) |
| 150 | { |
| 151 | struct linux_prom_registers *regs; |
| 152 | struct property *prop; |
| 153 | |
| 154 | prop = of_find_property(dp, "reg", NULL); |
| 155 | if (!prop) |
| 156 | return; |
| 157 | |
| 158 | regs = prop->value; |
| 159 | sprintf(tmp_buf, "%s@%x,%x", |
| 160 | dp->name, |
| 161 | regs->which_io, |
| 162 | regs->phys_addr); |
| 163 | } |
| 164 | |
| 165 | /* "name@devnum[,func]" */ |
| 166 | static void __init pci_path_component(struct device_node *dp, char *tmp_buf) |
| 167 | { |
| 168 | struct linux_prom_pci_registers *regs; |
| 169 | struct property *prop; |
| 170 | unsigned int devfn; |
| 171 | |
| 172 | prop = of_find_property(dp, "reg", NULL); |
| 173 | if (!prop) |
| 174 | return; |
| 175 | |
| 176 | regs = prop->value; |
| 177 | devfn = (regs->phys_hi >> 8) & 0xff; |
| 178 | if (devfn & 0x07) { |
| 179 | sprintf(tmp_buf, "%s@%x,%x", |
| 180 | dp->name, |
| 181 | devfn >> 3, |
| 182 | devfn & 0x07); |
| 183 | } else { |
| 184 | sprintf(tmp_buf, "%s@%x", |
| 185 | dp->name, |
| 186 | devfn >> 3); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /* "name@UPA_PORTID,offset" */ |
| 191 | static void __init upa_path_component(struct device_node *dp, char *tmp_buf) |
| 192 | { |
| 193 | struct linux_prom64_registers *regs; |
| 194 | struct property *prop; |
| 195 | |
| 196 | prop = of_find_property(dp, "reg", NULL); |
| 197 | if (!prop) |
| 198 | return; |
| 199 | |
| 200 | regs = prop->value; |
| 201 | |
| 202 | prop = of_find_property(dp, "upa-portid", NULL); |
| 203 | if (!prop) |
| 204 | return; |
| 205 | |
| 206 | sprintf(tmp_buf, "%s@%x,%x", |
| 207 | dp->name, |
| 208 | *(u32 *) prop->value, |
| 209 | (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| 210 | } |
| 211 | |
| 212 | /* "name@reg" */ |
| 213 | static void __init vdev_path_component(struct device_node *dp, char *tmp_buf) |
| 214 | { |
| 215 | struct property *prop; |
| 216 | u32 *regs; |
| 217 | |
| 218 | prop = of_find_property(dp, "reg", NULL); |
| 219 | if (!prop) |
| 220 | return; |
| 221 | |
| 222 | regs = prop->value; |
| 223 | |
| 224 | sprintf(tmp_buf, "%s@%x", dp->name, *regs); |
| 225 | } |
| 226 | |
| 227 | /* "name@addrhi,addrlo" */ |
| 228 | static void __init ebus_path_component(struct device_node *dp, char *tmp_buf) |
| 229 | { |
| 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 | dp->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 | struct property *prop; |
| 249 | u32 *regs; |
| 250 | |
| 251 | prop = of_find_property(dp, "reg", NULL); |
| 252 | if (!prop) |
| 253 | return; |
| 254 | |
| 255 | regs = prop->value; |
| 256 | |
| 257 | /* This actually isn't right... should look at the #address-cells |
| 258 | * property of the i2c bus node etc. etc. |
| 259 | */ |
| 260 | sprintf(tmp_buf, "%s@%x,%x", |
| 261 | dp->name, regs[0], regs[1]); |
| 262 | } |
| 263 | |
| 264 | /* "name@reg0[,reg1]" */ |
| 265 | static void __init usb_path_component(struct device_node *dp, char *tmp_buf) |
| 266 | { |
| 267 | struct property *prop; |
| 268 | u32 *regs; |
| 269 | |
| 270 | prop = of_find_property(dp, "reg", NULL); |
| 271 | if (!prop) |
| 272 | return; |
| 273 | |
| 274 | regs = prop->value; |
| 275 | |
| 276 | if (prop->length == sizeof(u32) || regs[1] == 1) { |
| 277 | sprintf(tmp_buf, "%s@%x", |
| 278 | dp->name, regs[0]); |
| 279 | } else { |
| 280 | sprintf(tmp_buf, "%s@%x,%x", |
| 281 | dp->name, regs[0], regs[1]); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | /* "name@reg0reg1[,reg2reg3]" */ |
| 286 | static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf) |
| 287 | { |
| 288 | struct property *prop; |
| 289 | u32 *regs; |
| 290 | |
| 291 | prop = of_find_property(dp, "reg", NULL); |
| 292 | if (!prop) |
| 293 | return; |
| 294 | |
| 295 | regs = prop->value; |
| 296 | |
| 297 | if (regs[2] || regs[3]) { |
| 298 | sprintf(tmp_buf, "%s@%08x%08x,%04x%08x", |
| 299 | dp->name, regs[0], regs[1], regs[2], regs[3]); |
| 300 | } else { |
| 301 | sprintf(tmp_buf, "%s@%08x%08x", |
| 302 | dp->name, regs[0], regs[1]); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | static void __init __build_path_component(struct device_node *dp, char *tmp_buf) |
| 307 | { |
| 308 | struct device_node *parent = dp->parent; |
| 309 | |
| 310 | if (parent != NULL) { |
| 311 | if (!strcmp(parent->type, "pci") || |
| 312 | !strcmp(parent->type, "pciex")) { |
| 313 | pci_path_component(dp, tmp_buf); |
| 314 | return; |
| 315 | } |
| 316 | if (!strcmp(parent->type, "sbus")) { |
| 317 | sbus_path_component(dp, tmp_buf); |
| 318 | return; |
| 319 | } |
| 320 | if (!strcmp(parent->type, "upa")) { |
| 321 | upa_path_component(dp, tmp_buf); |
| 322 | return; |
| 323 | } |
| 324 | if (!strcmp(parent->type, "ebus")) { |
| 325 | ebus_path_component(dp, tmp_buf); |
| 326 | return; |
| 327 | } |
| 328 | if (!strcmp(parent->name, "usb") || |
| 329 | !strcmp(parent->name, "hub")) { |
| 330 | usb_path_component(dp, tmp_buf); |
| 331 | return; |
| 332 | } |
| 333 | if (!strcmp(parent->type, "i2c")) { |
| 334 | i2c_path_component(dp, tmp_buf); |
| 335 | return; |
| 336 | } |
| 337 | if (!strcmp(parent->type, "firewire")) { |
| 338 | ieee1394_path_component(dp, tmp_buf); |
| 339 | return; |
| 340 | } |
| 341 | if (!strcmp(parent->type, "virtual-devices")) { |
| 342 | vdev_path_component(dp, tmp_buf); |
| 343 | return; |
| 344 | } |
| 345 | /* "isa" is handled with platform naming */ |
| 346 | } |
| 347 | |
| 348 | /* Use platform naming convention. */ |
| 349 | if (tlb_type == hypervisor) { |
| 350 | sun4v_path_component(dp, tmp_buf); |
| 351 | return; |
| 352 | } else { |
| 353 | sun4u_path_component(dp, tmp_buf); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | char * __init build_path_component(struct device_node *dp) |
| 358 | { |
| 359 | char tmp_buf[64], *n; |
| 360 | |
| 361 | tmp_buf[0] = '\0'; |
| 362 | __build_path_component(dp, tmp_buf); |
| 363 | if (tmp_buf[0] == '\0') |
| 364 | strcpy(tmp_buf, dp->name); |
| 365 | |
| 366 | n = prom_early_alloc(strlen(tmp_buf) + 1); |
| 367 | strcpy(n, tmp_buf); |
| 368 | |
| 369 | return n; |
| 370 | } |
| 371 | |
| 372 | static const char *get_mid_prop(void) |
| 373 | { |
| 374 | return (tlb_type == spitfire ? "upa-portid" : "portid"); |
| 375 | } |
| 376 | |
| 377 | struct device_node *of_find_node_by_cpuid(int cpuid) |
| 378 | { |
| 379 | struct device_node *dp; |
| 380 | const char *mid_prop = get_mid_prop(); |
| 381 | |
| 382 | for_each_node_by_type(dp, "cpu") { |
| 383 | int id = of_getintprop_default(dp, mid_prop, -1); |
| 384 | const char *this_mid_prop = mid_prop; |
| 385 | |
| 386 | if (id < 0) { |
| 387 | this_mid_prop = "cpuid"; |
| 388 | id = of_getintprop_default(dp, this_mid_prop, -1); |
| 389 | } |
| 390 | |
| 391 | if (id < 0) { |
| 392 | prom_printf("OF: Serious problem, cpu lacks " |
| 393 | "%s property", this_mid_prop); |
| 394 | prom_halt(); |
| 395 | } |
| 396 | if (cpuid == id) |
| 397 | return dp; |
| 398 | } |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | void __init of_fill_in_cpu_data(void) |
| 403 | { |
| 404 | struct device_node *dp; |
| 405 | const char *mid_prop; |
| 406 | |
| 407 | if (tlb_type == hypervisor) |
| 408 | return; |
| 409 | |
| 410 | mid_prop = get_mid_prop(); |
| 411 | ncpus_probed = 0; |
| 412 | for_each_node_by_type(dp, "cpu") { |
| 413 | int cpuid = of_getintprop_default(dp, mid_prop, -1); |
| 414 | const char *this_mid_prop = mid_prop; |
| 415 | struct device_node *portid_parent; |
| 416 | int portid = -1; |
| 417 | |
| 418 | portid_parent = NULL; |
| 419 | if (cpuid < 0) { |
| 420 | this_mid_prop = "cpuid"; |
| 421 | cpuid = of_getintprop_default(dp, this_mid_prop, -1); |
| 422 | if (cpuid >= 0) { |
| 423 | int limit = 2; |
| 424 | |
| 425 | portid_parent = dp; |
| 426 | while (limit--) { |
| 427 | portid_parent = portid_parent->parent; |
| 428 | if (!portid_parent) |
| 429 | break; |
| 430 | portid = of_getintprop_default(portid_parent, |
| 431 | "portid", -1); |
| 432 | if (portid >= 0) |
| 433 | break; |
| 434 | } |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | if (cpuid < 0) { |
| 439 | prom_printf("OF: Serious problem, cpu lacks " |
| 440 | "%s property", this_mid_prop); |
| 441 | prom_halt(); |
| 442 | } |
| 443 | |
| 444 | ncpus_probed++; |
| 445 | |
| 446 | #ifdef CONFIG_SMP |
| 447 | if (cpuid >= NR_CPUS) { |
| 448 | printk(KERN_WARNING "Ignoring CPU %d which is " |
| 449 | ">= NR_CPUS (%d)\n", |
| 450 | cpuid, NR_CPUS); |
| 451 | continue; |
| 452 | } |
| 453 | #else |
| 454 | /* On uniprocessor we only want the values for the |
| 455 | * real physical cpu the kernel booted onto, however |
| 456 | * cpu_data() only has one entry at index 0. |
| 457 | */ |
| 458 | if (cpuid != real_hard_smp_processor_id()) |
| 459 | continue; |
| 460 | cpuid = 0; |
| 461 | #endif |
| 462 | |
| 463 | cpu_data(cpuid).clock_tick = |
| 464 | of_getintprop_default(dp, "clock-frequency", 0); |
| 465 | |
| 466 | if (portid_parent) { |
| 467 | cpu_data(cpuid).dcache_size = |
| 468 | of_getintprop_default(dp, "l1-dcache-size", |
| 469 | 16 * 1024); |
| 470 | cpu_data(cpuid).dcache_line_size = |
| 471 | of_getintprop_default(dp, "l1-dcache-line-size", |
| 472 | 32); |
| 473 | cpu_data(cpuid).icache_size = |
| 474 | of_getintprop_default(dp, "l1-icache-size", |
| 475 | 8 * 1024); |
| 476 | cpu_data(cpuid).icache_line_size = |
| 477 | of_getintprop_default(dp, "l1-icache-line-size", |
| 478 | 32); |
| 479 | cpu_data(cpuid).ecache_size = |
| 480 | of_getintprop_default(dp, "l2-cache-size", 0); |
| 481 | cpu_data(cpuid).ecache_line_size = |
| 482 | of_getintprop_default(dp, "l2-cache-line-size", 0); |
| 483 | if (!cpu_data(cpuid).ecache_size || |
| 484 | !cpu_data(cpuid).ecache_line_size) { |
| 485 | cpu_data(cpuid).ecache_size = |
| 486 | of_getintprop_default(portid_parent, |
| 487 | "l2-cache-size", |
| 488 | (4 * 1024 * 1024)); |
| 489 | cpu_data(cpuid).ecache_line_size = |
| 490 | of_getintprop_default(portid_parent, |
| 491 | "l2-cache-line-size", 64); |
| 492 | } |
| 493 | |
| 494 | cpu_data(cpuid).core_id = portid + 1; |
| 495 | cpu_data(cpuid).proc_id = portid; |
| 496 | #ifdef CONFIG_SMP |
| 497 | sparc64_multi_core = 1; |
| 498 | #endif |
| 499 | } else { |
| 500 | cpu_data(cpuid).dcache_size = |
| 501 | of_getintprop_default(dp, "dcache-size", 16 * 1024); |
| 502 | cpu_data(cpuid).dcache_line_size = |
| 503 | of_getintprop_default(dp, "dcache-line-size", 32); |
| 504 | |
| 505 | cpu_data(cpuid).icache_size = |
| 506 | of_getintprop_default(dp, "icache-size", 16 * 1024); |
| 507 | cpu_data(cpuid).icache_line_size = |
| 508 | of_getintprop_default(dp, "icache-line-size", 32); |
| 509 | |
| 510 | cpu_data(cpuid).ecache_size = |
| 511 | of_getintprop_default(dp, "ecache-size", |
| 512 | (4 * 1024 * 1024)); |
| 513 | cpu_data(cpuid).ecache_line_size = |
| 514 | of_getintprop_default(dp, "ecache-line-size", 64); |
| 515 | |
| 516 | cpu_data(cpuid).core_id = 0; |
| 517 | cpu_data(cpuid).proc_id = -1; |
| 518 | } |
| 519 | |
| 520 | #ifdef CONFIG_SMP |
| 521 | cpu_set(cpuid, cpu_present_map); |
| 522 | cpu_set(cpuid, cpu_possible_map); |
| 523 | #endif |
| 524 | } |
| 525 | |
| 526 | smp_fill_in_sib_core_maps(); |
| 527 | } |
| 528 | |
| 529 | void __init of_console_init(void) |
| 530 | { |
| 531 | char *msg = "OF stdout device is: %s\n"; |
| 532 | struct device_node *dp; |
| 533 | const char *type; |
| 534 | phandle node; |
| 535 | |
| 536 | of_console_path = prom_early_alloc(256); |
| 537 | if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) { |
| 538 | prom_printf("Cannot obtain path of stdout.\n"); |
| 539 | prom_halt(); |
| 540 | } |
| 541 | of_console_options = strrchr(of_console_path, ':'); |
| 542 | if (of_console_options) { |
| 543 | of_console_options++; |
| 544 | if (*of_console_options == '\0') |
| 545 | of_console_options = NULL; |
| 546 | } |
| 547 | |
| 548 | node = prom_inst2pkg(prom_stdout); |
| 549 | if (!node) { |
| 550 | prom_printf("Cannot resolve stdout node from " |
| 551 | "instance %08x.\n", prom_stdout); |
| 552 | prom_halt(); |
| 553 | } |
| 554 | |
| 555 | dp = of_find_node_by_phandle(node); |
| 556 | type = of_get_property(dp, "device_type", NULL); |
| 557 | if (!type) { |
| 558 | prom_printf("Console stdout lacks device_type property.\n"); |
| 559 | prom_halt(); |
| 560 | } |
| 561 | |
| 562 | if (strcmp(type, "display") && strcmp(type, "serial")) { |
| 563 | prom_printf("Console device_type is neither display " |
| 564 | "nor serial.\n"); |
| 565 | prom_halt(); |
| 566 | } |
| 567 | |
| 568 | of_console_device = dp; |
| 569 | |
| 570 | printk(msg, of_console_path); |
| 571 | } |