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 <linux/of_platform.h> 39 #include <linux/platform_device.h> 40 #include <asm/io.h> 41 #include <asm/prom.h> 42 #include <asm/processor.h> 43 #include <asm/vdso_datapage.h> 44 #include <asm/pgtable.h> 45 #include <asm/smp.h> 46 #include <asm/elf.h> 47 #include <asm/machdep.h> 48 #include <asm/time.h> 49 #include <asm/cputable.h> 50 #include <asm/sections.h> 51 #include <asm/firmware.h> 52 #include <asm/btext.h> 53 #include <asm/nvram.h> 54 #include <asm/setup.h> 55 #include <asm/system.h> 56 #include <asm/rtas.h> 57 #include <asm/iommu.h> 58 #include <asm/serial.h> 59 #include <asm/cache.h> 60 #include <asm/page.h> 61 #include <asm/mmu.h> 62 #include <asm/xmon.h> 63 #include <asm/cputhreads.h> 64 #include <mm/mmu_decl.h> 65 66 #include "setup.h" 67 68 #ifdef DEBUG 69 #include <asm/udbg.h> 70 #define DBG(fmt...) udbg_printf(fmt) 71 #else 72 #define DBG(fmt...) 73 #endif 74 75 /* The main machine-dep calls structure 76 */ 77 struct machdep_calls ppc_md; 78 EXPORT_SYMBOL(ppc_md); 79 struct machdep_calls *machine_id; 80 EXPORT_SYMBOL(machine_id); 81 82 unsigned long klimit = (unsigned long) _end; 83 84 char cmd_line[COMMAND_LINE_SIZE]; 85 86 /* 87 * This still seems to be needed... -- paulus 88 */ 89 struct screen_info screen_info = { 90 .orig_x = 0, 91 .orig_y = 25, 92 .orig_video_cols = 80, 93 .orig_video_lines = 25, 94 .orig_video_isVGA = 1, 95 .orig_video_points = 16 96 }; 97 98 #ifdef __DO_IRQ_CANON 99 /* XXX should go elsewhere eventually */ 100 int ppc_do_canonicalize_irqs; 101 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 102 #endif 103 104 /* also used by kexec */ 105 void machine_shutdown(void) 106 { 107 if (ppc_md.machine_shutdown) 108 ppc_md.machine_shutdown(); 109 } 110 111 void machine_restart(char *cmd) 112 { 113 machine_shutdown(); 114 if (ppc_md.restart) 115 ppc_md.restart(cmd); 116 #ifdef CONFIG_SMP 117 smp_send_stop(); 118 #endif 119 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 120 local_irq_disable(); 121 while (1) ; 122 } 123 124 void machine_power_off(void) 125 { 126 machine_shutdown(); 127 if (ppc_md.power_off) 128 ppc_md.power_off(); 129 #ifdef CONFIG_SMP 130 smp_send_stop(); 131 #endif 132 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 133 local_irq_disable(); 134 while (1) ; 135 } 136 /* Used by the G5 thermal driver */ 137 EXPORT_SYMBOL_GPL(machine_power_off); 138 139 void (*pm_power_off)(void) = machine_power_off; 140 EXPORT_SYMBOL_GPL(pm_power_off); 141 142 void machine_halt(void) 143 { 144 machine_shutdown(); 145 if (ppc_md.halt) 146 ppc_md.halt(); 147 #ifdef CONFIG_SMP 148 smp_send_stop(); 149 #endif 150 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 151 local_irq_disable(); 152 while (1) ; 153 } 154 155 156 #ifdef CONFIG_TAU 157 extern u32 cpu_temp(unsigned long cpu); 158 extern u32 cpu_temp_both(unsigned long cpu); 159 #endif /* CONFIG_TAU */ 160 161 #ifdef CONFIG_SMP 162 DEFINE_PER_CPU(unsigned int, pvr); 163 #endif 164 165 static int show_cpuinfo(struct seq_file *m, void *v) 166 { 167 unsigned long cpu_id = (unsigned long)v - 1; 168 unsigned int pvr; 169 unsigned short maj; 170 unsigned short min; 171 172 if (cpu_id == NR_CPUS) { 173 struct device_node *root; 174 const char *model = NULL; 175 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 176 unsigned long bogosum = 0; 177 int i; 178 for_each_online_cpu(i) 179 bogosum += loops_per_jiffy; 180 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 181 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 182 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 183 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 184 if (ppc_md.name) 185 seq_printf(m, "platform\t: %s\n", ppc_md.name); 186 root = of_find_node_by_path("/"); 187 if (root) 188 model = of_get_property(root, "model", NULL); 189 if (model) 190 seq_printf(m, "model\t\t: %s\n", model); 191 of_node_put(root); 192 193 if (ppc_md.show_cpuinfo != NULL) 194 ppc_md.show_cpuinfo(m); 195 196 #ifdef CONFIG_PPC32 197 /* Display the amount of memory */ 198 seq_printf(m, "Memory\t\t: %d MB\n", 199 (unsigned int)(total_memory / (1024 * 1024))); 200 #endif 201 202 return 0; 203 } 204 205 /* We only show online cpus: disable preempt (overzealous, I 206 * knew) to prevent cpu going down. */ 207 preempt_disable(); 208 if (!cpu_online(cpu_id)) { 209 preempt_enable(); 210 return 0; 211 } 212 213 #ifdef CONFIG_SMP 214 pvr = per_cpu(pvr, cpu_id); 215 #else 216 pvr = mfspr(SPRN_PVR); 217 #endif 218 maj = (pvr >> 8) & 0xFF; 219 min = pvr & 0xFF; 220 221 seq_printf(m, "processor\t: %lu\n", cpu_id); 222 seq_printf(m, "cpu\t\t: "); 223 224 if (cur_cpu_spec->pvr_mask) 225 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 226 else 227 seq_printf(m, "unknown (%08x)", pvr); 228 229 #ifdef CONFIG_ALTIVEC 230 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 231 seq_printf(m, ", altivec supported"); 232 #endif /* CONFIG_ALTIVEC */ 233 234 seq_printf(m, "\n"); 235 236 #ifdef CONFIG_TAU 237 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 238 #ifdef CONFIG_TAU_AVERAGE 239 /* more straightforward, but potentially misleading */ 240 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 241 cpu_temp(cpu_id)); 242 #else 243 /* show the actual temp sensor range */ 244 u32 temp; 245 temp = cpu_temp_both(cpu_id); 246 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 247 temp & 0xff, temp >> 16); 248 #endif 249 } 250 #endif /* CONFIG_TAU */ 251 252 /* 253 * Assume here that all clock rates are the same in a 254 * smp system. -- Cort 255 */ 256 if (ppc_proc_freq) 257 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 258 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); 259 260 if (ppc_md.show_percpuinfo != NULL) 261 ppc_md.show_percpuinfo(m, cpu_id); 262 263 /* If we are a Freescale core do a simple check so 264 * we dont have to keep adding cases in the future */ 265 if (PVR_VER(pvr) & 0x8000) { 266 switch (PVR_VER(pvr)) { 267 case 0x8000: /* 7441/7450/7451, Voyager */ 268 case 0x8001: /* 7445/7455, Apollo 6 */ 269 case 0x8002: /* 7447/7457, Apollo 7 */ 270 case 0x8003: /* 7447A, Apollo 7 PM */ 271 case 0x8004: /* 7448, Apollo 8 */ 272 case 0x800c: /* 7410, Nitro */ 273 maj = ((pvr >> 8) & 0xF); 274 min = PVR_MIN(pvr); 275 break; 276 default: /* e500/book-e */ 277 maj = PVR_MAJ(pvr); 278 min = PVR_MIN(pvr); 279 break; 280 } 281 } else { 282 switch (PVR_VER(pvr)) { 283 case 0x0020: /* 403 family */ 284 maj = PVR_MAJ(pvr) + 1; 285 min = PVR_MIN(pvr); 286 break; 287 case 0x1008: /* 740P/750P ?? */ 288 maj = ((pvr >> 8) & 0xFF) - 1; 289 min = pvr & 0xFF; 290 break; 291 default: 292 maj = (pvr >> 8) & 0xFF; 293 min = pvr & 0xFF; 294 break; 295 } 296 } 297 298 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 299 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 300 301 #ifdef CONFIG_PPC32 302 seq_printf(m, "bogomips\t: %lu.%02lu\n", 303 loops_per_jiffy / (500000/HZ), 304 (loops_per_jiffy / (5000/HZ)) % 100); 305 #endif 306 307 #ifdef CONFIG_SMP 308 seq_printf(m, "\n"); 309 #endif 310 311 preempt_enable(); 312 return 0; 313 } 314 315 static void *c_start(struct seq_file *m, loff_t *pos) 316 { 317 unsigned long i = *pos; 318 319 return i <= NR_CPUS ? (void *)(i + 1) : NULL; 320 } 321 322 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 323 { 324 ++*pos; 325 return c_start(m, pos); 326 } 327 328 static void c_stop(struct seq_file *m, void *v) 329 { 330 } 331 332 struct seq_operations cpuinfo_op = { 333 .start =c_start, 334 .next = c_next, 335 .stop = c_stop, 336 .show = show_cpuinfo, 337 }; 338 339 void __init check_for_initrd(void) 340 { 341 #ifdef CONFIG_BLK_DEV_INITRD 342 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 343 initrd_start, initrd_end); 344 345 /* If we were passed an initrd, set the ROOT_DEV properly if the values 346 * look sensible. If not, clear initrd reference. 347 */ 348 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 349 initrd_end > initrd_start) 350 ROOT_DEV = Root_RAM0; 351 else 352 initrd_start = initrd_end = 0; 353 354 if (initrd_start) 355 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 356 357 DBG(" <- check_for_initrd()\n"); 358 #endif /* CONFIG_BLK_DEV_INITRD */ 359 } 360 361 #ifdef CONFIG_SMP 362 363 int threads_per_core, threads_shift; 364 cpumask_t threads_core_mask; 365 366 static void __init cpu_init_thread_core_maps(int tpc) 367 { 368 int i; 369 370 threads_per_core = tpc; 371 threads_core_mask = CPU_MASK_NONE; 372 373 /* This implementation only supports power of 2 number of threads 374 * for simplicity and performance 375 */ 376 threads_shift = ilog2(tpc); 377 BUG_ON(tpc != (1 << threads_shift)); 378 379 for (i = 0; i < tpc; i++) 380 cpu_set(i, threads_core_mask); 381 382 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 383 tpc, tpc > 1 ? "s" : ""); 384 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 385 } 386 387 388 /** 389 * setup_cpu_maps - initialize the following cpu maps: 390 * cpu_possible_map 391 * cpu_present_map 392 * 393 * Having the possible map set up early allows us to restrict allocations 394 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 395 * 396 * We do not initialize the online map here; cpus set their own bits in 397 * cpu_online_map as they come up. 398 * 399 * This function is valid only for Open Firmware systems. finish_device_tree 400 * must be called before using this. 401 * 402 * While we're here, we may as well set the "physical" cpu ids in the paca. 403 * 404 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 405 */ 406 void __init smp_setup_cpu_maps(void) 407 { 408 struct device_node *dn = NULL; 409 int cpu = 0; 410 int nthreads = 1; 411 412 DBG("smp_setup_cpu_maps()\n"); 413 414 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 415 const int *intserv; 416 int j, len; 417 418 DBG(" * %s...\n", dn->full_name); 419 420 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 421 &len); 422 if (intserv) { 423 nthreads = len / sizeof(int); 424 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 425 nthreads); 426 } else { 427 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 428 intserv = of_get_property(dn, "reg", NULL); 429 if (!intserv) 430 intserv = &cpu; /* assume logical == phys */ 431 } 432 433 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { 434 DBG(" thread %d -> cpu %d (hard id %d)\n", 435 j, cpu, intserv[j]); 436 cpu_set(cpu, cpu_present_map); 437 set_hard_smp_processor_id(cpu, intserv[j]); 438 cpu_set(cpu, cpu_possible_map); 439 cpu++; 440 } 441 } 442 443 /* If no SMT supported, nthreads is forced to 1 */ 444 if (!cpu_has_feature(CPU_FTR_SMT)) { 445 DBG(" SMT disabled ! nthreads forced to 1\n"); 446 nthreads = 1; 447 } 448 449 #ifdef CONFIG_PPC64 450 /* 451 * On pSeries LPAR, we need to know how many cpus 452 * could possibly be added to this partition. 453 */ 454 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) && 455 (dn = of_find_node_by_path("/rtas"))) { 456 int num_addr_cell, num_size_cell, maxcpus; 457 const unsigned int *ireg; 458 459 num_addr_cell = of_n_addr_cells(dn); 460 num_size_cell = of_n_size_cells(dn); 461 462 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 463 464 if (!ireg) 465 goto out; 466 467 maxcpus = ireg[num_addr_cell + num_size_cell]; 468 469 /* Double maxcpus for processors which have SMT capability */ 470 if (cpu_has_feature(CPU_FTR_SMT)) 471 maxcpus *= nthreads; 472 473 if (maxcpus > NR_CPUS) { 474 printk(KERN_WARNING 475 "Partition configured for %d cpus, " 476 "operating system maximum is %d.\n", 477 maxcpus, NR_CPUS); 478 maxcpus = NR_CPUS; 479 } else 480 printk(KERN_INFO "Partition configured for %d cpus.\n", 481 maxcpus); 482 483 for (cpu = 0; cpu < maxcpus; cpu++) 484 cpu_set(cpu, cpu_possible_map); 485 out: 486 of_node_put(dn); 487 } 488 vdso_data->processorCount = num_present_cpus(); 489 #endif /* CONFIG_PPC64 */ 490 491 /* Initialize CPU <=> thread mapping/ 492 * 493 * WARNING: We assume that the number of threads is the same for 494 * every CPU in the system. If that is not the case, then some code 495 * here will have to be reworked 496 */ 497 cpu_init_thread_core_maps(nthreads); 498 } 499 #endif /* CONFIG_SMP */ 500 501 #ifdef CONFIG_PCSPKR_PLATFORM 502 static __init int add_pcspkr(void) 503 { 504 struct device_node *np; 505 struct platform_device *pd; 506 int ret; 507 508 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 509 of_node_put(np); 510 if (!np) 511 return -ENODEV; 512 513 pd = platform_device_alloc("pcspkr", -1); 514 if (!pd) 515 return -ENOMEM; 516 517 ret = platform_device_add(pd); 518 if (ret) 519 platform_device_put(pd); 520 521 return ret; 522 } 523 device_initcall(add_pcspkr); 524 #endif /* CONFIG_PCSPKR_PLATFORM */ 525 526 void probe_machine(void) 527 { 528 extern struct machdep_calls __machine_desc_start; 529 extern struct machdep_calls __machine_desc_end; 530 531 /* 532 * Iterate all ppc_md structures until we find the proper 533 * one for the current machine type 534 */ 535 DBG("Probing machine type ...\n"); 536 537 for (machine_id = &__machine_desc_start; 538 machine_id < &__machine_desc_end; 539 machine_id++) { 540 DBG(" %s ...", machine_id->name); 541 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 542 if (ppc_md.probe()) { 543 DBG(" match !\n"); 544 break; 545 } 546 DBG("\n"); 547 } 548 /* What can we do if we didn't find ? */ 549 if (machine_id >= &__machine_desc_end) { 550 DBG("No suitable machine found !\n"); 551 for (;;); 552 } 553 554 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 555 } 556 557 /* Match a class of boards, not a specific device configuration. */ 558 int check_legacy_ioport(unsigned long base_port) 559 { 560 struct device_node *parent, *np = NULL; 561 int ret = -ENODEV; 562 563 switch(base_port) { 564 case I8042_DATA_REG: 565 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 566 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 567 if (np) { 568 parent = of_get_parent(np); 569 of_node_put(np); 570 np = parent; 571 break; 572 } 573 np = of_find_node_by_type(NULL, "8042"); 574 /* Pegasos has no device_type on its 8042 node, look for the 575 * name instead */ 576 if (!np) 577 np = of_find_node_by_name(NULL, "8042"); 578 break; 579 case FDC_BASE: /* FDC1 */ 580 np = of_find_node_by_type(NULL, "fdc"); 581 break; 582 #ifdef CONFIG_PPC_PREP 583 case _PIDXR: 584 case _PNPWRP: 585 case PNPBIOS_BASE: 586 /* implement me */ 587 #endif 588 default: 589 /* ipmi is supposed to fail here */ 590 break; 591 } 592 if (!np) 593 return ret; 594 parent = of_get_parent(np); 595 if (parent) { 596 if (strcmp(parent->type, "isa") == 0) 597 ret = 0; 598 of_node_put(parent); 599 } 600 of_node_put(np); 601 return ret; 602 } 603 EXPORT_SYMBOL(check_legacy_ioport); 604 605 static int ppc_panic_event(struct notifier_block *this, 606 unsigned long event, void *ptr) 607 { 608 ppc_md.panic(ptr); /* May not return */ 609 return NOTIFY_DONE; 610 } 611 612 static struct notifier_block ppc_panic_block = { 613 .notifier_call = ppc_panic_event, 614 .priority = INT_MIN /* may not return; must be done last */ 615 }; 616 617 void __init setup_panic(void) 618 { 619 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 620 } 621 622 #ifdef CONFIG_CHECK_CACHE_COHERENCY 623 /* 624 * For platforms that have configurable cache-coherency. This function 625 * checks that the cache coherency setting of the kernel matches the setting 626 * left by the firmware, as indicated in the device tree. Since a mismatch 627 * will eventually result in DMA failures, we print * and error and call 628 * BUG() in that case. 629 */ 630 631 #ifdef CONFIG_NOT_COHERENT_CACHE 632 #define KERNEL_COHERENCY 0 633 #else 634 #define KERNEL_COHERENCY 1 635 #endif 636 637 static int __init check_cache_coherency(void) 638 { 639 struct device_node *np; 640 const void *prop; 641 int devtree_coherency; 642 643 np = of_find_node_by_path("/"); 644 prop = of_get_property(np, "coherency-off", NULL); 645 of_node_put(np); 646 647 devtree_coherency = prop ? 0 : 1; 648 649 if (devtree_coherency != KERNEL_COHERENCY) { 650 printk(KERN_ERR 651 "kernel coherency:%s != device tree_coherency:%s\n", 652 KERNEL_COHERENCY ? "on" : "off", 653 devtree_coherency ? "on" : "off"); 654 BUG(); 655 } 656 657 return 0; 658 } 659 660 late_initcall(check_cache_coherency); 661 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 662 663 #ifdef CONFIG_DEBUG_FS 664 struct dentry *powerpc_debugfs_root; 665 666 static int powerpc_debugfs_init(void) 667 { 668 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 669 670 return powerpc_debugfs_root == NULL; 671 } 672 arch_initcall(powerpc_debugfs_init); 673 #endif 674 675 static int ppc_dflt_bus_notify(struct notifier_block *nb, 676 unsigned long action, void *data) 677 { 678 struct device *dev = data; 679 680 /* We are only intereted in device addition */ 681 if (action != BUS_NOTIFY_ADD_DEVICE) 682 return 0; 683 684 set_dma_ops(dev, &dma_direct_ops); 685 686 return NOTIFY_DONE; 687 } 688 689 static struct notifier_block ppc_dflt_plat_bus_notifier = { 690 .notifier_call = ppc_dflt_bus_notify, 691 .priority = INT_MAX, 692 }; 693 694 static struct notifier_block ppc_dflt_of_bus_notifier = { 695 .notifier_call = ppc_dflt_bus_notify, 696 .priority = INT_MAX, 697 }; 698 699 static int __init setup_bus_notifier(void) 700 { 701 bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier); 702 bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier); 703 704 return 0; 705 } 706 707 arch_initcall(setup_bus_notifier); 708