arch/powerpc/kernel/setup-common.c

   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/export.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/screen_info.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/notifier.h>
  30 #include <linux/cpu.h>
  31 #include <linux/unistd.h>
  32 #include <linux/serial.h>
  33 #include <linux/serial_8250.h>
  34 #include <linux/debugfs.h>
  35 #include <linux/percpu.h>
  36 #include <linux/memblock.h>
  37 #include <linux/of_platform.h>
  38 #include <linux/hugetlb.h>
  39 #include <asm/io.h>
  40 #include <asm/paca.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/rtas.h>
  56 #include <asm/iommu.h>
  57 #include <asm/serial.h>
  58 #include <asm/cache.h>
  59 #include <asm/page.h>
  60 #include <asm/mmu.h>
  61 #include <asm/xmon.h>
  62 #include <asm/cputhreads.h>
  63 #include <mm/mmu_decl.h>
  64 #include <asm/fadump.h>
  65 #include <asm/udbg.h>
  66 #include <asm/hugetlb.h>
  67 #include <asm/livepatch.h>
  68 #include <asm/mmu_context.h>
  69
  70 #include "setup.h"
  71
  72 #ifdef DEBUG
  73 #include <asm/udbg.h>
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 /* The main machine-dep calls structure
  80  */
  81 struct machdep_calls ppc_md;
  82 EXPORT_SYMBOL(ppc_md);
  83 struct machdep_calls *machine_id;
  84 EXPORT_SYMBOL(machine_id);
  85
  86 int boot_cpuid = -1;
  87 EXPORT_SYMBOL_GPL(boot_cpuid);
  88
  89 unsigned long klimit = (unsigned long) _end;
  90
  91 /*
  92  * This still seems to be needed... -- paulus
  93  */
  94 struct screen_info screen_info = {
  95         .orig_x = 0,
  96         .orig_y = 25,
  97         .orig_video_cols = 80,
  98         .orig_video_lines = 25,
  99         .orig_video_isVGA = 1,
 100         .orig_video_points = 16
 101 };
 102 #if defined(CONFIG_FB_VGA16_MODULE)
 103 EXPORT_SYMBOL(screen_info);
 104 #endif
 105
 106 /* Variables required to store legacy IO irq routing */
 107 int of_i8042_kbd_irq;
 108 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 109 int of_i8042_aux_irq;
 110 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 111
 112 #ifdef __DO_IRQ_CANON
 113 /* XXX should go elsewhere eventually */
 114 int ppc_do_canonicalize_irqs;
 115 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 116 #endif
 117
 118 /* also used by kexec */
 119 void machine_shutdown(void)
 120 {
 121 #ifdef CONFIG_FA_DUMP
 122         /*
 123          * if fadump is active, cleanup the fadump registration before we
 124          * shutdown.
 125          */
 126         fadump_cleanup();
 127 #endif
 128
 129         if (ppc_md.machine_shutdown)
 130                 ppc_md.machine_shutdown();
 131 }
 132
 133 void machine_restart(char *cmd)
 134 {
 135         machine_shutdown();
 136         if (ppc_md.restart)
 137                 ppc_md.restart(cmd);
 138         smp_send_stop();
 139         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 140         local_irq_disable();
 141         while (1) ;
 142 }
 143
 144 void machine_power_off(void)
 145 {
 146         machine_shutdown();
 147         if (pm_power_off)
 148                 pm_power_off();
 149         smp_send_stop();
 150         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 151         local_irq_disable();
 152         while (1) ;
 153 }
 154 /* Used by the G5 thermal driver */
 155 EXPORT_SYMBOL_GPL(machine_power_off);
 156
 157 void (*pm_power_off)(void);
 158 EXPORT_SYMBOL_GPL(pm_power_off);
 159
 160 void machine_halt(void)
 161 {
 162         machine_shutdown();
 163         if (ppc_md.halt)
 164                 ppc_md.halt();
 165         smp_send_stop();
 166         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 167         local_irq_disable();
 168         while (1) ;
 169 }
 170
 171
 172 #ifdef CONFIG_TAU
 173 extern u32 cpu_temp(unsigned long cpu);
 174 extern u32 cpu_temp_both(unsigned long cpu);
 175 #endif /* CONFIG_TAU */
 176
 177 #ifdef CONFIG_SMP
 178 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 179 #endif
 180
 181 static void show_cpuinfo_summary(struct seq_file *m)
 182 {
 183         struct device_node *root;
 184         const char *model = NULL;
 185 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 186         unsigned long bogosum = 0;
 187         int i;
 188         for_each_online_cpu(i)
 189                 bogosum += loops_per_jiffy;
 190         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 191                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 192 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 193         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 194         if (ppc_md.name)
 195                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 196         root = of_find_node_by_path("/");
 197         if (root)
 198                 model = of_get_property(root, "model", NULL);
 199         if (model)
 200                 seq_printf(m, "model\t\t: %s\n", model);
 201         of_node_put(root);
 202
 203         if (ppc_md.show_cpuinfo != NULL)
 204                 ppc_md.show_cpuinfo(m);
 205
 206 #ifdef CONFIG_PPC32
 207         /* Display the amount of memory */
 208         seq_printf(m, "Memory\t\t: %d MB\n",
 209                    (unsigned int)(total_memory / (1024 * 1024)));
 210 #endif
 211 }
 212
 213 static int show_cpuinfo(struct seq_file *m, void *v)
 214 {
 215         unsigned long cpu_id = (unsigned long)v - 1;
 216         unsigned int pvr;
 217         unsigned long proc_freq;
 218         unsigned short maj;
 219         unsigned short min;
 220
 221         /* We only show online cpus: disable preempt (overzealous, I
 222          * knew) to prevent cpu going down. */
 223         preempt_disable();
 224         if (!cpu_online(cpu_id)) {
 225                 preempt_enable();
 226                 return 0;
 227         }
 228
 229 #ifdef CONFIG_SMP
 230         pvr = per_cpu(cpu_pvr, cpu_id);
 231 #else
 232         pvr = mfspr(SPRN_PVR);
 233 #endif
 234         maj = (pvr >> 8) & 0xFF;
 235         min = pvr & 0xFF;
 236
 237         seq_printf(m, "processor\t: %lu\n", cpu_id);
 238         seq_printf(m, "cpu\t\t: ");
 239
 240         if (cur_cpu_spec->pvr_mask)
 241                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 242         else
 243                 seq_printf(m, "unknown (%08x)", pvr);
 244
 245 #ifdef CONFIG_ALTIVEC
 246         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 247                 seq_printf(m, ", altivec supported");
 248 #endif /* CONFIG_ALTIVEC */
 249
 250         seq_printf(m, "\n");
 251
 252 #ifdef CONFIG_TAU
 253         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 254 #ifdef CONFIG_TAU_AVERAGE
 255                 /* more straightforward, but potentially misleading */
 256                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 257                            cpu_temp(cpu_id));
 258 #else
 259                 /* show the actual temp sensor range */
 260                 u32 temp;
 261                 temp = cpu_temp_both(cpu_id);
 262                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 263                            temp & 0xff, temp >> 16);
 264 #endif
 265         }
 266 #endif /* CONFIG_TAU */
 267
 268         /*
 269          * Platforms that have variable clock rates, should implement
 270          * the method ppc_md.get_proc_freq() that reports the clock
 271          * rate of a given cpu. The rest can use ppc_proc_freq to
 272          * report the clock rate that is same across all cpus.
 273          */
 274         if (ppc_md.get_proc_freq)
 275                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 276         else
 277                 proc_freq = ppc_proc_freq;
 278
 279         if (proc_freq)
 280                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 281                            proc_freq / 1000000, proc_freq % 1000000);
 282
 283         if (ppc_md.show_percpuinfo != NULL)
 284                 ppc_md.show_percpuinfo(m, cpu_id);
 285
 286         /* If we are a Freescale core do a simple check so
 287          * we dont have to keep adding cases in the future */
 288         if (PVR_VER(pvr) & 0x8000) {
 289                 switch (PVR_VER(pvr)) {
 290                 case 0x8000:    /* 7441/7450/7451, Voyager */
 291                 case 0x8001:    /* 7445/7455, Apollo 6 */
 292                 case 0x8002:    /* 7447/7457, Apollo 7 */
 293                 case 0x8003:    /* 7447A, Apollo 7 PM */
 294                 case 0x8004:    /* 7448, Apollo 8 */
 295                 case 0x800c:    /* 7410, Nitro */
 296                         maj = ((pvr >> 8) & 0xF);
 297                         min = PVR_MIN(pvr);
 298                         break;
 299                 default:        /* e500/book-e */
 300                         maj = PVR_MAJ(pvr);
 301                         min = PVR_MIN(pvr);
 302                         break;
 303                 }
 304         } else {
 305                 switch (PVR_VER(pvr)) {
 306                         case 0x0020:    /* 403 family */
 307                                 maj = PVR_MAJ(pvr) + 1;
 308                                 min = PVR_MIN(pvr);
 309                                 break;
 310                         case 0x1008:    /* 740P/750P ?? */
 311                                 maj = ((pvr >> 8) & 0xFF) - 1;
 312                                 min = pvr & 0xFF;
 313                                 break;
 314                         default:
 315                                 maj = (pvr >> 8) & 0xFF;
 316                                 min = pvr & 0xFF;
 317                                 break;
 318                 }
 319         }
 320
 321         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 322                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 323
 324 #ifdef CONFIG_PPC32
 325         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 326                    loops_per_jiffy / (500000/HZ),
 327                    (loops_per_jiffy / (5000/HZ)) % 100);
 328 #endif
 329
 330 #ifdef CONFIG_SMP
 331         seq_printf(m, "\n");
 332 #endif
 333
 334         preempt_enable();
 335
 336         /* If this is the last cpu, print the summary */
 337         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 338                 show_cpuinfo_summary(m);
 339
 340         return 0;
 341 }
 342
 343 static void *c_start(struct seq_file *m, loff_t *pos)
 344 {
 345         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 346                 *pos = cpumask_first(cpu_online_mask);
 347         else
 348                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 349         if ((*pos) < nr_cpu_ids)
 350                 return (void *)(unsigned long)(*pos + 1);
 351         return NULL;
 352 }
 353
 354 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 355 {
 356         (*pos)++;
 357         return c_start(m, pos);
 358 }
 359
 360 static void c_stop(struct seq_file *m, void *v)
 361 {
 362 }
 363
 364 const struct seq_operations cpuinfo_op = {
 365         .start =c_start,
 366         .next = c_next,
 367         .stop = c_stop,
 368         .show = show_cpuinfo,
 369 };
 370
 371 void __init check_for_initrd(void)
 372 {
 373 #ifdef CONFIG_BLK_DEV_INITRD
 374         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 375             initrd_start, initrd_end);
 376
 377         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 378          * look sensible. If not, clear initrd reference.
 379          */
 380         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 381             initrd_end > initrd_start)
 382                 ROOT_DEV = Root_RAM0;
 383         else
 384                 initrd_start = initrd_end = 0;
 385
 386         if (initrd_start)
 387                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 388
 389         DBG(" <- check_for_initrd()\n");
 390 #endif /* CONFIG_BLK_DEV_INITRD */
 391 }
 392
 393 #ifdef CONFIG_SMP
 394
 395 int threads_per_core, threads_per_subcore, threads_shift;
 396 cpumask_t threads_core_mask;
 397 EXPORT_SYMBOL_GPL(threads_per_core);
 398 EXPORT_SYMBOL_GPL(threads_per_subcore);
 399 EXPORT_SYMBOL_GPL(threads_shift);
 400 EXPORT_SYMBOL_GPL(threads_core_mask);
 401
 402 static void __init cpu_init_thread_core_maps(int tpc)
 403 {
 404         int i;
 405
 406         threads_per_core = tpc;
 407         threads_per_subcore = tpc;
 408         cpumask_clear(&threads_core_mask);
 409
 410         /* This implementation only supports power of 2 number of threads
 411          * for simplicity and performance
 412          */
 413         threads_shift = ilog2(tpc);
 414         BUG_ON(tpc != (1 << threads_shift));
 415
 416         for (i = 0; i < tpc; i++)
 417                 cpumask_set_cpu(i, &threads_core_mask);
 418
 419         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 420                tpc, tpc > 1 ? "s" : "");
 421         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 422 }
 423
 424
 425 /**
 426  * setup_cpu_maps - initialize the following cpu maps:
 427  *                  cpu_possible_mask
 428  *                  cpu_present_mask
 429  *
 430  * Having the possible map set up early allows us to restrict allocations
 431  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 432  *
 433  * We do not initialize the online map here; cpus set their own bits in
 434  * cpu_online_mask as they come up.
 435  *
 436  * This function is valid only for Open Firmware systems.  finish_device_tree
 437  * must be called before using this.
 438  *
 439  * While we're here, we may as well set the "physical" cpu ids in the paca.
 440  *
 441  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 442  */
 443 void __init smp_setup_cpu_maps(void)
 444 {
 445         struct device_node *dn = NULL;
 446         int cpu = 0;
 447         int nthreads = 1;
 448
 449         DBG("smp_setup_cpu_maps()\n");
 450
 451         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 452                 const __be32 *intserv;
 453                 __be32 cpu_be;
 454                 int j, len;
 455
 456                 DBG("  * %s...\n", dn->full_name);
 457
 458                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 459                                 &len);
 460                 if (intserv) {
 461                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 462                             nthreads);
 463                 } else {
 464                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 465                         intserv = of_get_property(dn, "reg", &len);
 466                         if (!intserv) {
 467                                 cpu_be = cpu_to_be32(cpu);
 468                                 intserv = &cpu_be;      /* assume logical == phys */
 469                                 len = 4;
 470                         }
 471                 }
 472
 473                 nthreads = len / sizeof(int);
 474
 475                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 476                         bool avail;
 477
 478                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 479                             j, cpu, be32_to_cpu(intserv[j]));
 480
 481                         avail = of_device_is_available(dn);
 482                         if (!avail)
 483                                 avail = !of_property_match_string(dn,
 484                                                 "enable-method", "spin-table");
 485
 486                         set_cpu_present(cpu, avail);
 487                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 488                         set_cpu_possible(cpu, true);
 489                         cpu++;
 490                 }
 491         }
 492
 493         /* If no SMT supported, nthreads is forced to 1 */
 494         if (!cpu_has_feature(CPU_FTR_SMT)) {
 495                 DBG("  SMT disabled ! nthreads forced to 1\n");
 496                 nthreads = 1;
 497         }
 498
 499 #ifdef CONFIG_PPC64
 500         /*
 501          * On pSeries LPAR, we need to know how many cpus
 502          * could possibly be added to this partition.
 503          */
 504         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 505             (dn = of_find_node_by_path("/rtas"))) {
 506                 int num_addr_cell, num_size_cell, maxcpus;
 507                 const __be32 *ireg;
 508
 509                 num_addr_cell = of_n_addr_cells(dn);
 510                 num_size_cell = of_n_size_cells(dn);
 511
 512                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 513
 514                 if (!ireg)
 515                         goto out;
 516
 517                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 518
 519                 /* Double maxcpus for processors which have SMT capability */
 520                 if (cpu_has_feature(CPU_FTR_SMT))
 521                         maxcpus *= nthreads;
 522
 523                 if (maxcpus > nr_cpu_ids) {
 524                         printk(KERN_WARNING
 525                                "Partition configured for %d cpus, "
 526                                "operating system maximum is %d.\n",
 527                                maxcpus, nr_cpu_ids);
 528                         maxcpus = nr_cpu_ids;
 529                 } else
 530                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 531                                maxcpus);
 532
 533                 for (cpu = 0; cpu < maxcpus; cpu++)
 534                         set_cpu_possible(cpu, true);
 535         out:
 536                 of_node_put(dn);
 537         }
 538         vdso_data->processorCount = num_present_cpus();
 539 #endif /* CONFIG_PPC64 */
 540
 541         /* Initialize CPU <=> thread mapping/
 542          *
 543          * WARNING: We assume that the number of threads is the same for
 544          * every CPU in the system. If that is not the case, then some code
 545          * here will have to be reworked
 546          */
 547         cpu_init_thread_core_maps(nthreads);
 548
 549         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 550         setup_nr_cpu_ids();
 551
 552         free_unused_pacas();
 553 }
 554 #endif /* CONFIG_SMP */
 555
 556 #ifdef CONFIG_PCSPKR_PLATFORM
 557 static __init int add_pcspkr(void)
 558 {
 559         struct device_node *np;
 560         struct platform_device *pd;
 561         int ret;
 562
 563         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 564         of_node_put(np);
 565         if (!np)
 566                 return -ENODEV;
 567
 568         pd = platform_device_alloc("pcspkr", -1);
 569         if (!pd)
 570                 return -ENOMEM;
 571
 572         ret = platform_device_add(pd);
 573         if (ret)
 574                 platform_device_put(pd);
 575
 576         return ret;
 577 }
 578 device_initcall(add_pcspkr);
 579 #endif  /* CONFIG_PCSPKR_PLATFORM */
 580
 581 void probe_machine(void)
 582 {
 583         extern struct machdep_calls __machine_desc_start;
 584         extern struct machdep_calls __machine_desc_end;
 585         unsigned int i;
 586
 587         /*
 588          * Iterate all ppc_md structures until we find the proper
 589          * one for the current machine type
 590          */
 591         DBG("Probing machine type ...\n");
 592
 593         /*
 594          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 595          * entry before probe_machine() which will be overwritten
 596          */
 597         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 598                 if (((void **)&ppc_md)[i]) {
 599                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 600                                " machine probe !\n", i);
 601                 }
 602         }
 603
 604         for (machine_id = &__machine_desc_start;
 605              machine_id < &__machine_desc_end;
 606              machine_id++) {
 607                 DBG("  %s ...", machine_id->name);
 608                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 609                 if (ppc_md.probe()) {
 610                         DBG(" match !\n");
 611                         break;
 612                 }
 613                 DBG("\n");
 614         }
 615         /* What can we do if we didn't find ? */
 616         if (machine_id >= &__machine_desc_end) {
 617                 DBG("No suitable machine found !\n");
 618                 for (;;);
 619         }
 620
 621         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 622 }
 623
 624 /* Match a class of boards, not a specific device configuration. */
 625 int check_legacy_ioport(unsigned long base_port)
 626 {
 627         struct device_node *parent, *np = NULL;
 628         int ret = -ENODEV;
 629
 630         switch(base_port) {
 631         case I8042_DATA_REG:
 632                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 633                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 634                 if (np) {
 635                         parent = of_get_parent(np);
 636
 637                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 638                         if (!of_i8042_kbd_irq)
 639                                 of_i8042_kbd_irq = 1;
 640
 641                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 642                         if (!of_i8042_aux_irq)
 643                                 of_i8042_aux_irq = 12;
 644
 645                         of_node_put(np);
 646                         np = parent;
 647                         break;
 648                 }
 649                 np = of_find_node_by_type(NULL, "8042");
 650                 /* Pegasos has no device_type on its 8042 node, look for the
 651                  * name instead */
 652                 if (!np)
 653                         np = of_find_node_by_name(NULL, "8042");
 654                 if (np) {
 655                         of_i8042_kbd_irq = 1;
 656                         of_i8042_aux_irq = 12;
 657                 }
 658                 break;
 659         case FDC_BASE: /* FDC1 */
 660                 np = of_find_node_by_type(NULL, "fdc");
 661                 break;
 662         default:
 663                 /* ipmi is supposed to fail here */
 664                 break;
 665         }
 666         if (!np)
 667                 return ret;
 668         parent = of_get_parent(np);
 669         if (parent) {
 670                 if (strcmp(parent->type, "isa") == 0)
 671                         ret = 0;
 672                 of_node_put(parent);
 673         }
 674         of_node_put(np);
 675         return ret;
 676 }
 677 EXPORT_SYMBOL(check_legacy_ioport);
 678
 679 static int ppc_panic_event(struct notifier_block *this,
 680                              unsigned long event, void *ptr)
 681 {
 682         /*
 683          * If firmware-assisted dump has been registered then trigger
 684          * firmware-assisted dump and let firmware handle everything else.
 685          */
 686         crash_fadump(NULL, ptr);
 687         ppc_md.panic(ptr);  /* May not return */
 688         return NOTIFY_DONE;
 689 }
 690
 691 static struct notifier_block ppc_panic_block = {
 692         .notifier_call = ppc_panic_event,
 693         .priority = INT_MIN /* may not return; must be done last */
 694 };
 695
 696 void __init setup_panic(void)
 697 {
 698         if (!ppc_md.panic)
 699                 return;
 700         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 701 }
 702
 703 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 704 /*
 705  * For platforms that have configurable cache-coherency.  This function
 706  * checks that the cache coherency setting of the kernel matches the setting
 707  * left by the firmware, as indicated in the device tree.  Since a mismatch
 708  * will eventually result in DMA failures, we print * and error and call
 709  * BUG() in that case.
 710  */
 711
 712 #ifdef CONFIG_NOT_COHERENT_CACHE
 713 #define KERNEL_COHERENCY        0
 714 #else
 715 #define KERNEL_COHERENCY        1
 716 #endif
 717
 718 static int __init check_cache_coherency(void)
 719 {
 720         struct device_node *np;
 721         const void *prop;
 722         int devtree_coherency;
 723
 724         np = of_find_node_by_path("/");
 725         prop = of_get_property(np, "coherency-off", NULL);
 726         of_node_put(np);
 727
 728         devtree_coherency = prop ? 0 : 1;
 729
 730         if (devtree_coherency != KERNEL_COHERENCY) {
 731                 printk(KERN_ERR
 732                         "kernel coherency:%s != device tree_coherency:%s\n",
 733                         KERNEL_COHERENCY ? "on" : "off",
 734                         devtree_coherency ? "on" : "off");
 735                 BUG();
 736         }
 737
 738         return 0;
 739 }
 740
 741 late_initcall(check_cache_coherency);
 742 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 743
 744 #ifdef CONFIG_DEBUG_FS
 745 struct dentry *powerpc_debugfs_root;
 746 EXPORT_SYMBOL(powerpc_debugfs_root);
 747
 748 static int powerpc_debugfs_init(void)
 749 {
 750         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 751
 752         return powerpc_debugfs_root == NULL;
 753 }
 754 arch_initcall(powerpc_debugfs_init);
 755 #endif
 756
 757 void ppc_printk_progress(char *s, unsigned short hex)
 758 {
 759         pr_info("%s\n", s);
 760 }
 761
 762 void arch_setup_pdev_archdata(struct platform_device *pdev)
 763 {
 764         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 765         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 766         set_dma_ops(&pdev->dev, &dma_direct_ops);
 767 }
 768
 769 static __init void print_system_info(void)
 770 {
 771         pr_info("-----------------------------------------------------\n");
 772 #ifdef CONFIG_PPC_STD_MMU_64
 773         pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
 774 #endif
 775 #ifdef CONFIG_PPC_STD_MMU_32
 776         pr_info("Hash_size         = 0x%lx\n", Hash_size);
 777 #endif
 778         pr_info("phys_mem_size     = 0x%llx\n",
 779                 (unsigned long long)memblock_phys_mem_size());
 780
 781         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 782         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 783         if (ucache_bsize != 0)
 784                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 785
 786         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 787         pr_info("  possible        = 0x%016lx\n",
 788                 (unsigned long)CPU_FTRS_POSSIBLE);
 789         pr_info("  always          = 0x%016lx\n",
 790                 (unsigned long)CPU_FTRS_ALWAYS);
 791         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 792                 cur_cpu_spec->cpu_user_features,
 793                 cur_cpu_spec->cpu_user_features2);
 794         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 795 #ifdef CONFIG_PPC64
 796         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 797 #endif
 798
 799 #ifdef CONFIG_PPC_STD_MMU_64
 800         if (htab_address)
 801                 pr_info("htab_address      = 0x%p\n", htab_address);
 802         if (htab_hash_mask)
 803                 pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
 804 #endif
 805 #ifdef CONFIG_PPC_STD_MMU_32
 806         if (Hash)
 807                 pr_info("Hash              = 0x%p\n", Hash);
 808         if (Hash_mask)
 809                 pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
 810 #endif
 811
 812         if (PHYSICAL_START > 0)
 813                 pr_info("physical_start    = 0x%llx\n",
 814                        (unsigned long long)PHYSICAL_START);
 815         pr_info("-----------------------------------------------------\n");
 816 }
 817
 818 /*
 819  * Called into from start_kernel this initializes memblock, which is used
 820  * to manage page allocation until mem_init is called.
 821  */
 822 void __init setup_arch(char **cmdline_p)
 823 {
 824         *cmdline_p = boot_command_line;
 825
 826         /* Set a half-reasonable default so udelay does something sensible */
 827         loops_per_jiffy = 500000000 / HZ;
 828
 829         /* Unflatten the device-tree passed by prom_init or kexec */
 830         unflatten_device_tree();
 831
 832         /*
 833          * Initialize cache line/block info from device-tree (on ppc64) or
 834          * just cputable (on ppc32).
 835          */
 836         initialize_cache_info();
 837
 838         /* Initialize RTAS if available. */
 839         rtas_initialize();
 840
 841         /* Check if we have an initrd provided via the device-tree. */
 842         check_for_initrd();
 843
 844         /* Probe the machine type, establish ppc_md. */
 845         probe_machine();
 846
 847         /* Setup panic notifier if requested by the platform. */
 848         setup_panic();
 849
 850         /*
 851          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 852          * it from their respective probe() function.
 853          */
 854         setup_power_save();
 855
 856         /* Discover standard serial ports. */
 857         find_legacy_serial_ports();
 858
 859         /* Register early console with the printk subsystem. */
 860         register_early_udbg_console();
 861
 862         /* Setup the various CPU maps based on the device-tree. */
 863         smp_setup_cpu_maps();
 864
 865         /* Initialize xmon. */
 866         xmon_setup();
 867
 868         /* Check the SMT related command line arguments (ppc64). */
 869         check_smt_enabled();
 870
 871         /* On BookE, setup per-core TLB data structures. */
 872         setup_tlb_core_data();
 873
 874         /*
 875          * Release secondary cpus out of their spinloops at 0x60 now that
 876          * we can map physical -> logical CPU ids.
 877          *
 878          * Freescale Book3e parts spin in a loop provided by firmware,
 879          * so smp_release_cpus() does nothing for them.
 880          */
 881 #ifdef CONFIG_SMP
 882         smp_release_cpus();
 883 #endif
 884
 885         /* Print various info about the machine that has been gathered so far. */
 886         print_system_info();
 887
 888         /* Reserve large chunks of memory for use by CMA for KVM. */
 889         kvm_cma_reserve();
 890
 891         /*
 892          * Reserve any gigantic pages requested on the command line.
 893          * memblock needs to have been initialized by the time this is
 894          * called since this will reserve memory.
 895          */
 896         reserve_hugetlb_gpages();
 897
 898         klp_init_thread_info(&init_thread_info);
 899
 900         init_mm.start_code = (unsigned long)_stext;
 901         init_mm.end_code = (unsigned long) _etext;
 902         init_mm.end_data = (unsigned long) _edata;
 903         init_mm.brk = klimit;
 904 #ifdef CONFIG_PPC_64K_PAGES
 905         init_mm.context.pte_frag = NULL;
 906 #endif
 907 #ifdef CONFIG_SPAPR_TCE_IOMMU
 908         mm_iommu_init(&init_mm.context);
 909 #endif
 910         irqstack_early_init();
 911         exc_lvl_early_init();
 912         emergency_stack_init();
 913
 914         initmem_init();
 915
 916 #ifdef CONFIG_DUMMY_CONSOLE
 917         conswitchp = &dummy_con;
 918 #endif
 919         if (ppc_md.setup_arch)
 920                 ppc_md.setup_arch();
 921
 922         paging_init();
 923
 924         /* Initialize the MMU context management stuff. */
 925         mmu_context_init();
 926
 927 #ifdef CONFIG_PPC64
 928         /* Interrupt code needs to be 64K-aligned. */
 929         if ((unsigned long)_stext & 0xffff)
 930                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 931                       (unsigned long)_stext);
 932 #endif
 933 }