1 /* 2 * Common boot and setup code for both 32-bit and 64-bit. 3 * Extracted from arch/powerpc/kernel/setup_64.c. 4 * 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #undef DEBUG 14 15 #include <linux/module.h> 16 #include <linux/string.h> 17 #include <linux/sched.h> 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/reboot.h> 21 #include <linux/delay.h> 22 #include <linux/initrd.h> 23 #include <linux/platform_device.h> 24 #include <linux/seq_file.h> 25 #include <linux/ioport.h> 26 #include <linux/console.h> 27 #include <linux/utsname.h> 28 #include <linux/screen_info.h> 29 #include <linux/root_dev.h> 30 #include <linux/notifier.h> 31 #include <linux/cpu.h> 32 #include <linux/unistd.h> 33 #include <linux/serial.h> 34 #include <linux/serial_8250.h> 35 #include <linux/debugfs.h> 36 #include <linux/percpu.h> 37 #include <linux/lmb.h> 38 #include <asm/io.h> 39 #include <asm/prom.h> 40 #include <asm/processor.h> 41 #include <asm/vdso_datapage.h> 42 #include <asm/pgtable.h> 43 #include <asm/smp.h> 44 #include <asm/elf.h> 45 #include <asm/machdep.h> 46 #include <asm/time.h> 47 #include <asm/cputable.h> 48 #include <asm/sections.h> 49 #include <asm/firmware.h> 50 #include <asm/btext.h> 51 #include <asm/nvram.h> 52 #include <asm/setup.h> 53 #include <asm/system.h> 54 #include <asm/rtas.h> 55 #include <asm/iommu.h> 56 #include <asm/serial.h> 57 #include <asm/cache.h> 58 #include <asm/page.h> 59 #include <asm/mmu.h> 60 #include <asm/xmon.h> 61 #include <asm/cputhreads.h> 62 63 #include "setup.h" 64 65 #ifdef DEBUG 66 #include <asm/udbg.h> 67 #define DBG(fmt...) udbg_printf(fmt) 68 #else 69 #define DBG(fmt...) 70 #endif 71 72 /* The main machine-dep calls structure 73 */ 74 struct machdep_calls ppc_md; 75 EXPORT_SYMBOL(ppc_md); 76 struct machdep_calls *machine_id; 77 EXPORT_SYMBOL(machine_id); 78 79 unsigned long klimit = (unsigned long) _end; 80 81 char cmd_line[COMMAND_LINE_SIZE]; 82 83 /* 84 * This still seems to be needed... -- paulus 85 */ 86 struct screen_info screen_info = { 87 .orig_x = 0, 88 .orig_y = 25, 89 .orig_video_cols = 80, 90 .orig_video_lines = 25, 91 .orig_video_isVGA = 1, 92 .orig_video_points = 16 93 }; 94 95 #ifdef __DO_IRQ_CANON 96 /* XXX should go elsewhere eventually */ 97 int ppc_do_canonicalize_irqs; 98 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 99 #endif 100 101 /* also used by kexec */ 102 void machine_shutdown(void) 103 { 104 if (ppc_md.machine_shutdown) 105 ppc_md.machine_shutdown(); 106 } 107 108 void machine_restart(char *cmd) 109 { 110 machine_shutdown(); 111 if (ppc_md.restart) 112 ppc_md.restart(cmd); 113 #ifdef CONFIG_SMP 114 smp_send_stop(); 115 #endif 116 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 117 local_irq_disable(); 118 while (1) ; 119 } 120 121 void machine_power_off(void) 122 { 123 machine_shutdown(); 124 if (ppc_md.power_off) 125 ppc_md.power_off(); 126 #ifdef CONFIG_SMP 127 smp_send_stop(); 128 #endif 129 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 130 local_irq_disable(); 131 while (1) ; 132 } 133 /* Used by the G5 thermal driver */ 134 EXPORT_SYMBOL_GPL(machine_power_off); 135 136 void (*pm_power_off)(void) = machine_power_off; 137 EXPORT_SYMBOL_GPL(pm_power_off); 138 139 void machine_halt(void) 140 { 141 machine_shutdown(); 142 if (ppc_md.halt) 143 ppc_md.halt(); 144 #ifdef CONFIG_SMP 145 smp_send_stop(); 146 #endif 147 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 148 local_irq_disable(); 149 while (1) ; 150 } 151 152 153 #ifdef CONFIG_TAU 154 extern u32 cpu_temp(unsigned long cpu); 155 extern u32 cpu_temp_both(unsigned long cpu); 156 #endif /* CONFIG_TAU */ 157 158 #ifdef CONFIG_SMP 159 DEFINE_PER_CPU(unsigned int, pvr); 160 #endif 161 162 static int show_cpuinfo(struct seq_file *m, void *v) 163 { 164 unsigned long cpu_id = (unsigned long)v - 1; 165 unsigned int pvr; 166 unsigned short maj; 167 unsigned short min; 168 169 if (cpu_id == NR_CPUS) { 170 struct device_node *root; 171 const char *model = NULL; 172 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 173 unsigned long bogosum = 0; 174 int i; 175 for_each_online_cpu(i) 176 bogosum += loops_per_jiffy; 177 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 178 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 179 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 180 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 181 if (ppc_md.name) 182 seq_printf(m, "platform\t: %s\n", ppc_md.name); 183 root = of_find_node_by_path("/"); 184 if (root) 185 model = of_get_property(root, "model", NULL); 186 if (model) 187 seq_printf(m, "model\t\t: %s\n", model); 188 of_node_put(root); 189 190 if (ppc_md.show_cpuinfo != NULL) 191 ppc_md.show_cpuinfo(m); 192 193 return 0; 194 } 195 196 /* We only show online cpus: disable preempt (overzealous, I 197 * knew) to prevent cpu going down. */ 198 preempt_disable(); 199 if (!cpu_online(cpu_id)) { 200 preempt_enable(); 201 return 0; 202 } 203 204 #ifdef CONFIG_SMP 205 pvr = per_cpu(pvr, cpu_id); 206 #else 207 pvr = mfspr(SPRN_PVR); 208 #endif 209 maj = (pvr >> 8) & 0xFF; 210 min = pvr & 0xFF; 211 212 seq_printf(m, "processor\t: %lu\n", cpu_id); 213 seq_printf(m, "cpu\t\t: "); 214 215 if (cur_cpu_spec->pvr_mask) 216 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 217 else 218 seq_printf(m, "unknown (%08x)", pvr); 219 220 #ifdef CONFIG_ALTIVEC 221 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 222 seq_printf(m, ", altivec supported"); 223 #endif /* CONFIG_ALTIVEC */ 224 225 seq_printf(m, "\n"); 226 227 #ifdef CONFIG_TAU 228 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 229 #ifdef CONFIG_TAU_AVERAGE 230 /* more straightforward, but potentially misleading */ 231 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 232 cpu_temp(cpu_id)); 233 #else 234 /* show the actual temp sensor range */ 235 u32 temp; 236 temp = cpu_temp_both(cpu_id); 237 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 238 temp & 0xff, temp >> 16); 239 #endif 240 } 241 #endif /* CONFIG_TAU */ 242 243 /* 244 * Assume here that all clock rates are the same in a 245 * smp system. -- Cort 246 */ 247 if (ppc_proc_freq) 248 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 249 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); 250 251 if (ppc_md.show_percpuinfo != NULL) 252 ppc_md.show_percpuinfo(m, cpu_id); 253 254 /* If we are a Freescale core do a simple check so 255 * we dont have to keep adding cases in the future */ 256 if (PVR_VER(pvr) & 0x8000) { 257 switch (PVR_VER(pvr)) { 258 case 0x8000: /* 7441/7450/7451, Voyager */ 259 case 0x8001: /* 7445/7455, Apollo 6 */ 260 case 0x8002: /* 7447/7457, Apollo 7 */ 261 case 0x8003: /* 7447A, Apollo 7 PM */ 262 case 0x8004: /* 7448, Apollo 8 */ 263 case 0x800c: /* 7410, Nitro */ 264 maj = ((pvr >> 8) & 0xF); 265 min = PVR_MIN(pvr); 266 break; 267 default: /* e500/book-e */ 268 maj = PVR_MAJ(pvr); 269 min = PVR_MIN(pvr); 270 break; 271 } 272 } else { 273 switch (PVR_VER(pvr)) { 274 case 0x0020: /* 403 family */ 275 maj = PVR_MAJ(pvr) + 1; 276 min = PVR_MIN(pvr); 277 break; 278 case 0x1008: /* 740P/750P ?? */ 279 maj = ((pvr >> 8) & 0xFF) - 1; 280 min = pvr & 0xFF; 281 break; 282 default: 283 maj = (pvr >> 8) & 0xFF; 284 min = pvr & 0xFF; 285 break; 286 } 287 } 288 289 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 290 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 291 292 #ifdef CONFIG_PPC32 293 seq_printf(m, "bogomips\t: %lu.%02lu\n", 294 loops_per_jiffy / (500000/HZ), 295 (loops_per_jiffy / (5000/HZ)) % 100); 296 #endif 297 298 #ifdef CONFIG_SMP 299 seq_printf(m, "\n"); 300 #endif 301 302 preempt_enable(); 303 return 0; 304 } 305 306 static void *c_start(struct seq_file *m, loff_t *pos) 307 { 308 unsigned long i = *pos; 309 310 return i <= NR_CPUS ? (void *)(i + 1) : NULL; 311 } 312 313 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 314 { 315 ++*pos; 316 return c_start(m, pos); 317 } 318 319 static void c_stop(struct seq_file *m, void *v) 320 { 321 } 322 323 struct seq_operations cpuinfo_op = { 324 .start =c_start, 325 .next = c_next, 326 .stop = c_stop, 327 .show = show_cpuinfo, 328 }; 329 330 void __init check_for_initrd(void) 331 { 332 #ifdef CONFIG_BLK_DEV_INITRD 333 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 334 initrd_start, initrd_end); 335 336 /* If we were passed an initrd, set the ROOT_DEV properly if the values 337 * look sensible. If not, clear initrd reference. 338 */ 339 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 340 initrd_end > initrd_start) 341 ROOT_DEV = Root_RAM0; 342 else 343 initrd_start = initrd_end = 0; 344 345 if (initrd_start) 346 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 347 348 DBG(" <- check_for_initrd()\n"); 349 #endif /* CONFIG_BLK_DEV_INITRD */ 350 } 351 352 #ifdef CONFIG_SMP 353 354 int threads_per_core, threads_shift; 355 cpumask_t threads_core_mask; 356 357 static void __init cpu_init_thread_core_maps(int tpc) 358 { 359 int i; 360 361 threads_per_core = tpc; 362 threads_core_mask = CPU_MASK_NONE; 363 364 /* This implementation only supports power of 2 number of threads 365 * for simplicity and performance 366 */ 367 threads_shift = ilog2(tpc); 368 BUG_ON(tpc != (1 << threads_shift)); 369 370 for (i = 0; i < tpc; i++) 371 cpu_set(i, threads_core_mask); 372 373 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 374 tpc, tpc > 1 ? "s" : ""); 375 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 376 } 377 378 379 /** 380 * setup_cpu_maps - initialize the following cpu maps: 381 * cpu_possible_map 382 * cpu_present_map 383 * 384 * Having the possible map set up early allows us to restrict allocations 385 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 386 * 387 * We do not initialize the online map here; cpus set their own bits in 388 * cpu_online_map as they come up. 389 * 390 * This function is valid only for Open Firmware systems. finish_device_tree 391 * must be called before using this. 392 * 393 * While we're here, we may as well set the "physical" cpu ids in the paca. 394 * 395 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 396 */ 397 void __init smp_setup_cpu_maps(void) 398 { 399 struct device_node *dn = NULL; 400 int cpu = 0; 401 int nthreads = 1; 402 403 DBG("smp_setup_cpu_maps()\n"); 404 405 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 406 const int *intserv; 407 int j, len; 408 409 DBG(" * %s...\n", dn->full_name); 410 411 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 412 &len); 413 if (intserv) { 414 nthreads = len / sizeof(int); 415 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 416 nthreads); 417 } else { 418 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 419 intserv = of_get_property(dn, "reg", NULL); 420 if (!intserv) 421 intserv = &cpu; /* assume logical == phys */ 422 } 423 424 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { 425 DBG(" thread %d -> cpu %d (hard id %d)\n", 426 j, cpu, intserv[j]); 427 cpu_set(cpu, cpu_present_map); 428 set_hard_smp_processor_id(cpu, intserv[j]); 429 cpu_set(cpu, cpu_possible_map); 430 cpu++; 431 } 432 } 433 434 /* If no SMT supported, nthreads is forced to 1 */ 435 if (!cpu_has_feature(CPU_FTR_SMT)) { 436 DBG(" SMT disabled ! nthreads forced to 1\n"); 437 nthreads = 1; 438 } 439 440 #ifdef CONFIG_PPC64 441 /* 442 * On pSeries LPAR, we need to know how many cpus 443 * could possibly be added to this partition. 444 */ 445 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) && 446 (dn = of_find_node_by_path("/rtas"))) { 447 int num_addr_cell, num_size_cell, maxcpus; 448 const unsigned int *ireg; 449 450 num_addr_cell = of_n_addr_cells(dn); 451 num_size_cell = of_n_size_cells(dn); 452 453 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 454 455 if (!ireg) 456 goto out; 457 458 maxcpus = ireg[num_addr_cell + num_size_cell]; 459 460 /* Double maxcpus for processors which have SMT capability */ 461 if (cpu_has_feature(CPU_FTR_SMT)) 462 maxcpus *= nthreads; 463 464 if (maxcpus > NR_CPUS) { 465 printk(KERN_WARNING 466 "Partition configured for %d cpus, " 467 "operating system maximum is %d.\n", 468 maxcpus, NR_CPUS); 469 maxcpus = NR_CPUS; 470 } else 471 printk(KERN_INFO "Partition configured for %d cpus.\n", 472 maxcpus); 473 474 for (cpu = 0; cpu < maxcpus; cpu++) 475 cpu_set(cpu, cpu_possible_map); 476 out: 477 of_node_put(dn); 478 } 479 vdso_data->processorCount = num_present_cpus(); 480 #endif /* CONFIG_PPC64 */ 481 482 /* Initialize CPU <=> thread mapping/ 483 * 484 * WARNING: We assume that the number of threads is the same for 485 * every CPU in the system. If that is not the case, then some code 486 * here will have to be reworked 487 */ 488 cpu_init_thread_core_maps(nthreads); 489 } 490 #endif /* CONFIG_SMP */ 491 492 #ifdef CONFIG_PCSPKR_PLATFORM 493 static __init int add_pcspkr(void) 494 { 495 struct device_node *np; 496 struct platform_device *pd; 497 int ret; 498 499 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 500 of_node_put(np); 501 if (!np) 502 return -ENODEV; 503 504 pd = platform_device_alloc("pcspkr", -1); 505 if (!pd) 506 return -ENOMEM; 507 508 ret = platform_device_add(pd); 509 if (ret) 510 platform_device_put(pd); 511 512 return ret; 513 } 514 device_initcall(add_pcspkr); 515 #endif /* CONFIG_PCSPKR_PLATFORM */ 516 517 void probe_machine(void) 518 { 519 extern struct machdep_calls __machine_desc_start; 520 extern struct machdep_calls __machine_desc_end; 521 522 /* 523 * Iterate all ppc_md structures until we find the proper 524 * one for the current machine type 525 */ 526 DBG("Probing machine type ...\n"); 527 528 for (machine_id = &__machine_desc_start; 529 machine_id < &__machine_desc_end; 530 machine_id++) { 531 DBG(" %s ...", machine_id->name); 532 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 533 if (ppc_md.probe()) { 534 DBG(" match !\n"); 535 break; 536 } 537 DBG("\n"); 538 } 539 /* What can we do if we didn't find ? */ 540 if (machine_id >= &__machine_desc_end) { 541 DBG("No suitable machine found !\n"); 542 for (;;); 543 } 544 545 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 546 } 547 548 /* Match a class of boards, not a specific device configuration. */ 549 int check_legacy_ioport(unsigned long base_port) 550 { 551 struct device_node *parent, *np = NULL; 552 int ret = -ENODEV; 553 554 switch(base_port) { 555 case I8042_DATA_REG: 556 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 557 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 558 if (np) { 559 parent = of_get_parent(np); 560 of_node_put(np); 561 np = parent; 562 break; 563 } 564 np = of_find_node_by_type(NULL, "8042"); 565 /* Pegasos has no device_type on its 8042 node, look for the 566 * name instead */ 567 if (!np) 568 np = of_find_node_by_name(NULL, "8042"); 569 break; 570 case FDC_BASE: /* FDC1 */ 571 np = of_find_node_by_type(NULL, "fdc"); 572 break; 573 #ifdef CONFIG_PPC_PREP 574 case _PIDXR: 575 case _PNPWRP: 576 case PNPBIOS_BASE: 577 /* implement me */ 578 #endif 579 default: 580 /* ipmi is supposed to fail here */ 581 break; 582 } 583 if (!np) 584 return ret; 585 parent = of_get_parent(np); 586 if (parent) { 587 if (strcmp(parent->type, "isa") == 0) 588 ret = 0; 589 of_node_put(parent); 590 } 591 of_node_put(np); 592 return ret; 593 } 594 EXPORT_SYMBOL(check_legacy_ioport); 595 596 static int ppc_panic_event(struct notifier_block *this, 597 unsigned long event, void *ptr) 598 { 599 ppc_md.panic(ptr); /* May not return */ 600 return NOTIFY_DONE; 601 } 602 603 static struct notifier_block ppc_panic_block = { 604 .notifier_call = ppc_panic_event, 605 .priority = INT_MIN /* may not return; must be done last */ 606 }; 607 608 void __init setup_panic(void) 609 { 610 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 611 } 612 613 #ifdef CONFIG_CHECK_CACHE_COHERENCY 614 /* 615 * For platforms that have configurable cache-coherency. This function 616 * checks that the cache coherency setting of the kernel matches the setting 617 * left by the firmware, as indicated in the device tree. Since a mismatch 618 * will eventually result in DMA failures, we print * and error and call 619 * BUG() in that case. 620 */ 621 622 #ifdef CONFIG_NOT_COHERENT_CACHE 623 #define KERNEL_COHERENCY 0 624 #else 625 #define KERNEL_COHERENCY 1 626 #endif 627 628 static int __init check_cache_coherency(void) 629 { 630 struct device_node *np; 631 const void *prop; 632 int devtree_coherency; 633 634 np = of_find_node_by_path("/"); 635 prop = of_get_property(np, "coherency-off", NULL); 636 of_node_put(np); 637 638 devtree_coherency = prop ? 0 : 1; 639 640 if (devtree_coherency != KERNEL_COHERENCY) { 641 printk(KERN_ERR 642 "kernel coherency:%s != device tree_coherency:%s\n", 643 KERNEL_COHERENCY ? "on" : "off", 644 devtree_coherency ? "on" : "off"); 645 BUG(); 646 } 647 648 return 0; 649 } 650 651 late_initcall(check_cache_coherency); 652 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 653 654 #ifdef CONFIG_DEBUG_FS 655 struct dentry *powerpc_debugfs_root; 656 657 static int powerpc_debugfs_init(void) 658 { 659 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 660 661 return powerpc_debugfs_root == NULL; 662 } 663 arch_initcall(powerpc_debugfs_init); 664 #endif 665