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 #include <asm/cpu_has_feature.h>
  70
  71 #include "setup.h"
  72
  73 #ifdef DEBUG
  74 #include <asm/udbg.h>
  75 #define DBG(fmt...) udbg_printf(fmt)
  76 #else
  77 #define DBG(fmt...)
  78 #endif
  79
  80 /* The main machine-dep calls structure
  81  */
  82 struct machdep_calls ppc_md;
  83 EXPORT_SYMBOL(ppc_md);
  84 struct machdep_calls *machine_id;
  85 EXPORT_SYMBOL(machine_id);
  86
  87 int boot_cpuid = -1;
  88 EXPORT_SYMBOL_GPL(boot_cpuid);
  89
  90 /*
  91  * These are used in binfmt_elf.c to put aux entries on the stack
  92  * for each elf executable being started.
  93  */
  94 int dcache_bsize;
  95 int icache_bsize;
  96 int ucache_bsize;
  97
  98
  99 unsigned long klimit = (unsigned long) _end;
 100
 101 /*
 102  * This still seems to be needed... -- paulus
 103  */
 104 struct screen_info screen_info = {
 105         .orig_x = 0,
 106         .orig_y = 25,
 107         .orig_video_cols = 80,
 108         .orig_video_lines = 25,
 109         .orig_video_isVGA = 1,
 110         .orig_video_points = 16
 111 };
 112 #if defined(CONFIG_FB_VGA16_MODULE)
 113 EXPORT_SYMBOL(screen_info);
 114 #endif
 115
 116 /* Variables required to store legacy IO irq routing */
 117 int of_i8042_kbd_irq;
 118 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 119 int of_i8042_aux_irq;
 120 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 121
 122 #ifdef __DO_IRQ_CANON
 123 /* XXX should go elsewhere eventually */
 124 int ppc_do_canonicalize_irqs;
 125 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 126 #endif
 127
 128 /* also used by kexec */
 129 void machine_shutdown(void)
 130 {
 131 #ifdef CONFIG_FA_DUMP
 132         /*
 133          * if fadump is active, cleanup the fadump registration before we
 134          * shutdown.
 135          */
 136         fadump_cleanup();
 137 #endif
 138
 139         if (ppc_md.machine_shutdown)
 140                 ppc_md.machine_shutdown();
 141 }
 142
 143 static void machine_hang(void)
 144 {
 145         pr_emerg("System Halted, OK to turn off power\n");
 146         local_irq_disable();
 147         while (1)
 148                 ;
 149 }
 150
 151 void machine_restart(char *cmd)
 152 {
 153         machine_shutdown();
 154         if (ppc_md.restart)
 155                 ppc_md.restart(cmd);
 156
 157         smp_send_stop();
 158
 159         do_kernel_restart(cmd);
 160         mdelay(1000);
 161
 162         machine_hang();
 163 }
 164
 165 void machine_power_off(void)
 166 {
 167         machine_shutdown();
 168         if (pm_power_off)
 169                 pm_power_off();
 170
 171         smp_send_stop();
 172         machine_hang();
 173 }
 174 /* Used by the G5 thermal driver */
 175 EXPORT_SYMBOL_GPL(machine_power_off);
 176
 177 void (*pm_power_off)(void);
 178 EXPORT_SYMBOL_GPL(pm_power_off);
 179
 180 void machine_halt(void)
 181 {
 182         machine_shutdown();
 183         if (ppc_md.halt)
 184                 ppc_md.halt();
 185
 186         smp_send_stop();
 187         machine_hang();
 188 }
 189
 190
 191 #ifdef CONFIG_TAU
 192 extern u32 cpu_temp(unsigned long cpu);
 193 extern u32 cpu_temp_both(unsigned long cpu);
 194 #endif /* CONFIG_TAU */
 195
 196 #ifdef CONFIG_SMP
 197 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 198 #endif
 199
 200 static void show_cpuinfo_summary(struct seq_file *m)
 201 {
 202         struct device_node *root;
 203         const char *model = NULL;
 204 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 205         unsigned long bogosum = 0;
 206         int i;
 207         for_each_online_cpu(i)
 208                 bogosum += loops_per_jiffy;
 209         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 210                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 211 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 212         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 213         if (ppc_md.name)
 214                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 215         root = of_find_node_by_path("/");
 216         if (root)
 217                 model = of_get_property(root, "model", NULL);
 218         if (model)
 219                 seq_printf(m, "model\t\t: %s\n", model);
 220         of_node_put(root);
 221
 222         if (ppc_md.show_cpuinfo != NULL)
 223                 ppc_md.show_cpuinfo(m);
 224
 225 #ifdef CONFIG_PPC32
 226         /* Display the amount of memory */
 227         seq_printf(m, "Memory\t\t: %d MB\n",
 228                    (unsigned int)(total_memory / (1024 * 1024)));
 229 #endif
 230 }
 231
 232 static int show_cpuinfo(struct seq_file *m, void *v)
 233 {
 234         unsigned long cpu_id = (unsigned long)v - 1;
 235         unsigned int pvr;
 236         unsigned long proc_freq;
 237         unsigned short maj;
 238         unsigned short min;
 239
 240         /* We only show online cpus: disable preempt (overzealous, I
 241          * knew) to prevent cpu going down. */
 242         preempt_disable();
 243         if (!cpu_online(cpu_id)) {
 244                 preempt_enable();
 245                 return 0;
 246         }
 247
 248 #ifdef CONFIG_SMP
 249         pvr = per_cpu(cpu_pvr, cpu_id);
 250 #else
 251         pvr = mfspr(SPRN_PVR);
 252 #endif
 253         maj = (pvr >> 8) & 0xFF;
 254         min = pvr & 0xFF;
 255
 256         seq_printf(m, "processor\t: %lu\n", cpu_id);
 257         seq_printf(m, "cpu\t\t: ");
 258
 259         if (cur_cpu_spec->pvr_mask)
 260                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 261         else
 262                 seq_printf(m, "unknown (%08x)", pvr);
 263
 264 #ifdef CONFIG_ALTIVEC
 265         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 266                 seq_printf(m, ", altivec supported");
 267 #endif /* CONFIG_ALTIVEC */
 268
 269         seq_printf(m, "\n");
 270
 271 #ifdef CONFIG_TAU
 272         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 273 #ifdef CONFIG_TAU_AVERAGE
 274                 /* more straightforward, but potentially misleading */
 275                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 276                            cpu_temp(cpu_id));
 277 #else
 278                 /* show the actual temp sensor range */
 279                 u32 temp;
 280                 temp = cpu_temp_both(cpu_id);
 281                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 282                            temp & 0xff, temp >> 16);
 283 #endif
 284         }
 285 #endif /* CONFIG_TAU */
 286
 287         /*
 288          * Platforms that have variable clock rates, should implement
 289          * the method ppc_md.get_proc_freq() that reports the clock
 290          * rate of a given cpu. The rest can use ppc_proc_freq to
 291          * report the clock rate that is same across all cpus.
 292          */
 293         if (ppc_md.get_proc_freq)
 294                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 295         else
 296                 proc_freq = ppc_proc_freq;
 297
 298         if (proc_freq)
 299                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 300                            proc_freq / 1000000, proc_freq % 1000000);
 301
 302         if (ppc_md.show_percpuinfo != NULL)
 303                 ppc_md.show_percpuinfo(m, cpu_id);
 304
 305         /* If we are a Freescale core do a simple check so
 306          * we dont have to keep adding cases in the future */
 307         if (PVR_VER(pvr) & 0x8000) {
 308                 switch (PVR_VER(pvr)) {
 309                 case 0x8000:    /* 7441/7450/7451, Voyager */
 310                 case 0x8001:    /* 7445/7455, Apollo 6 */
 311                 case 0x8002:    /* 7447/7457, Apollo 7 */
 312                 case 0x8003:    /* 7447A, Apollo 7 PM */
 313                 case 0x8004:    /* 7448, Apollo 8 */
 314                 case 0x800c:    /* 7410, Nitro */
 315                         maj = ((pvr >> 8) & 0xF);
 316                         min = PVR_MIN(pvr);
 317                         break;
 318                 default:        /* e500/book-e */
 319                         maj = PVR_MAJ(pvr);
 320                         min = PVR_MIN(pvr);
 321                         break;
 322                 }
 323         } else {
 324                 switch (PVR_VER(pvr)) {
 325                         case 0x0020:    /* 403 family */
 326                                 maj = PVR_MAJ(pvr) + 1;
 327                                 min = PVR_MIN(pvr);
 328                                 break;
 329                         case 0x1008:    /* 740P/750P ?? */
 330                                 maj = ((pvr >> 8) & 0xFF) - 1;
 331                                 min = pvr & 0xFF;
 332                                 break;
 333                         default:
 334                                 maj = (pvr >> 8) & 0xFF;
 335                                 min = pvr & 0xFF;
 336                                 break;
 337                 }
 338         }
 339
 340         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 341                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 342
 343 #ifdef CONFIG_PPC32
 344         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 345                    loops_per_jiffy / (500000/HZ),
 346                    (loops_per_jiffy / (5000/HZ)) % 100);
 347 #endif
 348
 349 #ifdef CONFIG_SMP
 350         seq_printf(m, "\n");
 351 #endif
 352
 353         preempt_enable();
 354
 355         /* If this is the last cpu, print the summary */
 356         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 357                 show_cpuinfo_summary(m);
 358
 359         return 0;
 360 }
 361
 362 static void *c_start(struct seq_file *m, loff_t *pos)
 363 {
 364         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 365                 *pos = cpumask_first(cpu_online_mask);
 366         else
 367                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 368         if ((*pos) < nr_cpu_ids)
 369                 return (void *)(unsigned long)(*pos + 1);
 370         return NULL;
 371 }
 372
 373 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 374 {
 375         (*pos)++;
 376         return c_start(m, pos);
 377 }
 378
 379 static void c_stop(struct seq_file *m, void *v)
 380 {
 381 }
 382
 383 const struct seq_operations cpuinfo_op = {
 384         .start =c_start,
 385         .next = c_next,
 386         .stop = c_stop,
 387         .show = show_cpuinfo,
 388 };
 389
 390 void __init check_for_initrd(void)
 391 {
 392 #ifdef CONFIG_BLK_DEV_INITRD
 393         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 394             initrd_start, initrd_end);
 395
 396         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 397          * look sensible. If not, clear initrd reference.
 398          */
 399         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 400             initrd_end > initrd_start)
 401                 ROOT_DEV = Root_RAM0;
 402         else
 403                 initrd_start = initrd_end = 0;
 404
 405         if (initrd_start)
 406                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 407
 408         DBG(" <- check_for_initrd()\n");
 409 #endif /* CONFIG_BLK_DEV_INITRD */
 410 }
 411
 412 #ifdef CONFIG_SMP
 413
 414 int threads_per_core, threads_per_subcore, threads_shift;
 415 cpumask_t threads_core_mask;
 416 EXPORT_SYMBOL_GPL(threads_per_core);
 417 EXPORT_SYMBOL_GPL(threads_per_subcore);
 418 EXPORT_SYMBOL_GPL(threads_shift);
 419 EXPORT_SYMBOL_GPL(threads_core_mask);
 420
 421 static void __init cpu_init_thread_core_maps(int tpc)
 422 {
 423         int i;
 424
 425         threads_per_core = tpc;
 426         threads_per_subcore = tpc;
 427         cpumask_clear(&threads_core_mask);
 428
 429         /* This implementation only supports power of 2 number of threads
 430          * for simplicity and performance
 431          */
 432         threads_shift = ilog2(tpc);
 433         BUG_ON(tpc != (1 << threads_shift));
 434
 435         for (i = 0; i < tpc; i++)
 436                 cpumask_set_cpu(i, &threads_core_mask);
 437
 438         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 439                tpc, tpc > 1 ? "s" : "");
 440         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 441 }
 442
 443
 444 /**
 445  * setup_cpu_maps - initialize the following cpu maps:
 446  *                  cpu_possible_mask
 447  *                  cpu_present_mask
 448  *
 449  * Having the possible map set up early allows us to restrict allocations
 450  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 451  *
 452  * We do not initialize the online map here; cpus set their own bits in
 453  * cpu_online_mask as they come up.
 454  *
 455  * This function is valid only for Open Firmware systems.  finish_device_tree
 456  * must be called before using this.
 457  *
 458  * While we're here, we may as well set the "physical" cpu ids in the paca.
 459  *
 460  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 461  */
 462 void __init smp_setup_cpu_maps(void)
 463 {
 464         struct device_node *dn = NULL;
 465         int cpu = 0;
 466         int nthreads = 1;
 467
 468         DBG("smp_setup_cpu_maps()\n");
 469
 470         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 471                 const __be32 *intserv;
 472                 __be32 cpu_be;
 473                 int j, len;
 474
 475                 DBG("  * %s...\n", dn->full_name);
 476
 477                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 478                                 &len);
 479                 if (intserv) {
 480                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 481                             nthreads);
 482                 } else {
 483                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 484                         intserv = of_get_property(dn, "reg", &len);
 485                         if (!intserv) {
 486                                 cpu_be = cpu_to_be32(cpu);
 487                                 intserv = &cpu_be;      /* assume logical == phys */
 488                                 len = 4;
 489                         }
 490                 }
 491
 492                 nthreads = len / sizeof(int);
 493
 494                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 495                         bool avail;
 496
 497                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 498                             j, cpu, be32_to_cpu(intserv[j]));
 499
 500                         avail = of_device_is_available(dn);
 501                         if (!avail)
 502                                 avail = !of_property_match_string(dn,
 503                                                 "enable-method", "spin-table");
 504
 505                         set_cpu_present(cpu, avail);
 506                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 507                         set_cpu_possible(cpu, true);
 508                         cpu++;
 509                 }
 510         }
 511
 512         /* If no SMT supported, nthreads is forced to 1 */
 513         if (!cpu_has_feature(CPU_FTR_SMT)) {
 514                 DBG("  SMT disabled ! nthreads forced to 1\n");
 515                 nthreads = 1;
 516         }
 517
 518 #ifdef CONFIG_PPC64
 519         /*
 520          * On pSeries LPAR, we need to know how many cpus
 521          * could possibly be added to this partition.
 522          */
 523         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 524             (dn = of_find_node_by_path("/rtas"))) {
 525                 int num_addr_cell, num_size_cell, maxcpus;
 526                 const __be32 *ireg;
 527
 528                 num_addr_cell = of_n_addr_cells(dn);
 529                 num_size_cell = of_n_size_cells(dn);
 530
 531                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 532
 533                 if (!ireg)
 534                         goto out;
 535
 536                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 537
 538                 /* Double maxcpus for processors which have SMT capability */
 539                 if (cpu_has_feature(CPU_FTR_SMT))
 540                         maxcpus *= nthreads;
 541
 542                 if (maxcpus > nr_cpu_ids) {
 543                         printk(KERN_WARNING
 544                                "Partition configured for %d cpus, "
 545                                "operating system maximum is %d.\n",
 546                                maxcpus, nr_cpu_ids);
 547                         maxcpus = nr_cpu_ids;
 548                 } else
 549                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 550                                maxcpus);
 551
 552                 for (cpu = 0; cpu < maxcpus; cpu++)
 553                         set_cpu_possible(cpu, true);
 554         out:
 555                 of_node_put(dn);
 556         }
 557         vdso_data->processorCount = num_present_cpus();
 558 #endif /* CONFIG_PPC64 */
 559
 560         /* Initialize CPU <=> thread mapping/
 561          *
 562          * WARNING: We assume that the number of threads is the same for
 563          * every CPU in the system. If that is not the case, then some code
 564          * here will have to be reworked
 565          */
 566         cpu_init_thread_core_maps(nthreads);
 567
 568         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 569         setup_nr_cpu_ids();
 570
 571         free_unused_pacas();
 572 }
 573 #endif /* CONFIG_SMP */
 574
 575 #ifdef CONFIG_PCSPKR_PLATFORM
 576 static __init int add_pcspkr(void)
 577 {
 578         struct device_node *np;
 579         struct platform_device *pd;
 580         int ret;
 581
 582         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 583         of_node_put(np);
 584         if (!np)
 585                 return -ENODEV;
 586
 587         pd = platform_device_alloc("pcspkr", -1);
 588         if (!pd)
 589                 return -ENOMEM;
 590
 591         ret = platform_device_add(pd);
 592         if (ret)
 593                 platform_device_put(pd);
 594
 595         return ret;
 596 }
 597 device_initcall(add_pcspkr);
 598 #endif  /* CONFIG_PCSPKR_PLATFORM */
 599
 600 void probe_machine(void)
 601 {
 602         extern struct machdep_calls __machine_desc_start;
 603         extern struct machdep_calls __machine_desc_end;
 604         unsigned int i;
 605
 606         /*
 607          * Iterate all ppc_md structures until we find the proper
 608          * one for the current machine type
 609          */
 610         DBG("Probing machine type ...\n");
 611
 612         /*
 613          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 614          * entry before probe_machine() which will be overwritten
 615          */
 616         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 617                 if (((void **)&ppc_md)[i]) {
 618                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 619                                " machine probe !\n", i);
 620                 }
 621         }
 622
 623         for (machine_id = &__machine_desc_start;
 624              machine_id < &__machine_desc_end;
 625              machine_id++) {
 626                 DBG("  %s ...", machine_id->name);
 627                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 628                 if (ppc_md.probe()) {
 629                         DBG(" match !\n");
 630                         break;
 631                 }
 632                 DBG("\n");
 633         }
 634         /* What can we do if we didn't find ? */
 635         if (machine_id >= &__machine_desc_end) {
 636                 DBG("No suitable machine found !\n");
 637                 for (;;);
 638         }
 639
 640         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 641 }
 642
 643 /* Match a class of boards, not a specific device configuration. */
 644 int check_legacy_ioport(unsigned long base_port)
 645 {
 646         struct device_node *parent, *np = NULL;
 647         int ret = -ENODEV;
 648
 649         switch(base_port) {
 650         case I8042_DATA_REG:
 651                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 652                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 653                 if (np) {
 654                         parent = of_get_parent(np);
 655
 656                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 657                         if (!of_i8042_kbd_irq)
 658                                 of_i8042_kbd_irq = 1;
 659
 660                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 661                         if (!of_i8042_aux_irq)
 662                                 of_i8042_aux_irq = 12;
 663
 664                         of_node_put(np);
 665                         np = parent;
 666                         break;
 667                 }
 668                 np = of_find_node_by_type(NULL, "8042");
 669                 /* Pegasos has no device_type on its 8042 node, look for the
 670                  * name instead */
 671                 if (!np)
 672                         np = of_find_node_by_name(NULL, "8042");
 673                 if (np) {
 674                         of_i8042_kbd_irq = 1;
 675                         of_i8042_aux_irq = 12;
 676                 }
 677                 break;
 678         case FDC_BASE: /* FDC1 */
 679                 np = of_find_node_by_type(NULL, "fdc");
 680                 break;
 681         default:
 682                 /* ipmi is supposed to fail here */
 683                 break;
 684         }
 685         if (!np)
 686                 return ret;
 687         parent = of_get_parent(np);
 688         if (parent) {
 689                 if (strcmp(parent->type, "isa") == 0)
 690                         ret = 0;
 691                 of_node_put(parent);
 692         }
 693         of_node_put(np);
 694         return ret;
 695 }
 696 EXPORT_SYMBOL(check_legacy_ioport);
 697
 698 static int ppc_panic_event(struct notifier_block *this,
 699                              unsigned long event, void *ptr)
 700 {
 701         /*
 702          * If firmware-assisted dump has been registered then trigger
 703          * firmware-assisted dump and let firmware handle everything else.
 704          */
 705         crash_fadump(NULL, ptr);
 706         ppc_md.panic(ptr);  /* May not return */
 707         return NOTIFY_DONE;
 708 }
 709
 710 static struct notifier_block ppc_panic_block = {
 711         .notifier_call = ppc_panic_event,
 712         .priority = INT_MIN /* may not return; must be done last */
 713 };
 714
 715 void __init setup_panic(void)
 716 {
 717         if (!ppc_md.panic)
 718                 return;
 719         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 720 }
 721
 722 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 723 /*
 724  * For platforms that have configurable cache-coherency.  This function
 725  * checks that the cache coherency setting of the kernel matches the setting
 726  * left by the firmware, as indicated in the device tree.  Since a mismatch
 727  * will eventually result in DMA failures, we print * and error and call
 728  * BUG() in that case.
 729  */
 730
 731 #ifdef CONFIG_NOT_COHERENT_CACHE
 732 #define KERNEL_COHERENCY        0
 733 #else
 734 #define KERNEL_COHERENCY        1
 735 #endif
 736
 737 static int __init check_cache_coherency(void)
 738 {
 739         struct device_node *np;
 740         const void *prop;
 741         int devtree_coherency;
 742
 743         np = of_find_node_by_path("/");
 744         prop = of_get_property(np, "coherency-off", NULL);
 745         of_node_put(np);
 746
 747         devtree_coherency = prop ? 0 : 1;
 748
 749         if (devtree_coherency != KERNEL_COHERENCY) {
 750                 printk(KERN_ERR
 751                         "kernel coherency:%s != device tree_coherency:%s\n",
 752                         KERNEL_COHERENCY ? "on" : "off",
 753                         devtree_coherency ? "on" : "off");
 754                 BUG();
 755         }
 756
 757         return 0;
 758 }
 759
 760 late_initcall(check_cache_coherency);
 761 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 762
 763 #ifdef CONFIG_DEBUG_FS
 764 struct dentry *powerpc_debugfs_root;
 765 EXPORT_SYMBOL(powerpc_debugfs_root);
 766
 767 static int powerpc_debugfs_init(void)
 768 {
 769         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 770
 771         return powerpc_debugfs_root == NULL;
 772 }
 773 arch_initcall(powerpc_debugfs_init);
 774 #endif
 775
 776 void ppc_printk_progress(char *s, unsigned short hex)
 777 {
 778         pr_info("%s\n", s);
 779 }
 780
 781 void arch_setup_pdev_archdata(struct platform_device *pdev)
 782 {
 783         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 784         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 785         set_dma_ops(&pdev->dev, &dma_direct_ops);
 786 }
 787
 788 static __init void print_system_info(void)
 789 {
 790         pr_info("-----------------------------------------------------\n");
 791 #ifdef CONFIG_PPC_STD_MMU_64
 792         pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
 793 #endif
 794 #ifdef CONFIG_PPC_STD_MMU_32
 795         pr_info("Hash_size         = 0x%lx\n", Hash_size);
 796 #endif
 797         pr_info("phys_mem_size     = 0x%llx\n",
 798                 (unsigned long long)memblock_phys_mem_size());
 799
 800         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 801         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 802         if (ucache_bsize != 0)
 803                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 804
 805         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 806         pr_info("  possible        = 0x%016lx\n",
 807                 (unsigned long)CPU_FTRS_POSSIBLE);
 808         pr_info("  always          = 0x%016lx\n",
 809                 (unsigned long)CPU_FTRS_ALWAYS);
 810         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 811                 cur_cpu_spec->cpu_user_features,
 812                 cur_cpu_spec->cpu_user_features2);
 813         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 814 #ifdef CONFIG_PPC64
 815         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 816 #endif
 817
 818 #ifdef CONFIG_PPC_STD_MMU_64
 819         if (htab_address)
 820                 pr_info("htab_address      = 0x%p\n", htab_address);
 821         if (htab_hash_mask)
 822                 pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
 823 #endif
 824 #ifdef CONFIG_PPC_STD_MMU_32
 825         if (Hash)
 826                 pr_info("Hash              = 0x%p\n", Hash);
 827         if (Hash_mask)
 828                 pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
 829 #endif
 830
 831         if (PHYSICAL_START > 0)
 832                 pr_info("physical_start    = 0x%llx\n",
 833                        (unsigned long long)PHYSICAL_START);
 834         pr_info("-----------------------------------------------------\n");
 835 }
 836
 837 /*
 838  * Called into from start_kernel this initializes memblock, which is used
 839  * to manage page allocation until mem_init is called.
 840  */
 841 void __init setup_arch(char **cmdline_p)
 842 {
 843         *cmdline_p = boot_command_line;
 844
 845         /* Set a half-reasonable default so udelay does something sensible */
 846         loops_per_jiffy = 500000000 / HZ;
 847
 848         /* Unflatten the device-tree passed by prom_init or kexec */
 849         unflatten_device_tree();
 850
 851         /*
 852          * Initialize cache line/block info from device-tree (on ppc64) or
 853          * just cputable (on ppc32).
 854          */
 855         initialize_cache_info();
 856
 857         /* Initialize RTAS if available. */
 858         rtas_initialize();
 859
 860         /* Check if we have an initrd provided via the device-tree. */
 861         check_for_initrd();
 862
 863         /* Probe the machine type, establish ppc_md. */
 864         probe_machine();
 865
 866         /* Setup panic notifier if requested by the platform. */
 867         setup_panic();
 868
 869         /*
 870          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 871          * it from their respective probe() function.
 872          */
 873         setup_power_save();
 874
 875         /* Discover standard serial ports. */
 876         find_legacy_serial_ports();
 877
 878         /* Register early console with the printk subsystem. */
 879         register_early_udbg_console();
 880
 881         /* Setup the various CPU maps based on the device-tree. */
 882         smp_setup_cpu_maps();
 883
 884         /* Initialize xmon. */
 885         xmon_setup();
 886
 887         /* Check the SMT related command line arguments (ppc64). */
 888         check_smt_enabled();
 889
 890         /* On BookE, setup per-core TLB data structures. */
 891         setup_tlb_core_data();
 892
 893         /*
 894          * Release secondary cpus out of their spinloops at 0x60 now that
 895          * we can map physical -> logical CPU ids.
 896          *
 897          * Freescale Book3e parts spin in a loop provided by firmware,
 898          * so smp_release_cpus() does nothing for them.
 899          */
 900 #ifdef CONFIG_SMP
 901         smp_release_cpus();
 902 #endif
 903
 904         /* Print various info about the machine that has been gathered so far. */
 905         print_system_info();
 906
 907         /* Reserve large chunks of memory for use by CMA for KVM. */
 908         kvm_cma_reserve();
 909
 910         /*
 911          * Reserve any gigantic pages requested on the command line.
 912          * memblock needs to have been initialized by the time this is
 913          * called since this will reserve memory.
 914          */
 915         reserve_hugetlb_gpages();
 916
 917         klp_init_thread_info(&init_thread_info);
 918
 919         init_mm.start_code = (unsigned long)_stext;
 920         init_mm.end_code = (unsigned long) _etext;
 921         init_mm.end_data = (unsigned long) _edata;
 922         init_mm.brk = klimit;
 923 #ifdef CONFIG_PPC_64K_PAGES
 924         init_mm.context.pte_frag = NULL;
 925 #endif
 926 #ifdef CONFIG_SPAPR_TCE_IOMMU
 927         mm_iommu_init(&init_mm);
 928 #endif
 929         irqstack_early_init();
 930         exc_lvl_early_init();
 931         emergency_stack_init();
 932
 933         initmem_init();
 934
 935 #ifdef CONFIG_DUMMY_CONSOLE
 936         conswitchp = &dummy_con;
 937 #endif
 938         if (ppc_md.setup_arch)
 939                 ppc_md.setup_arch();
 940
 941         paging_init();
 942
 943         /* Initialize the MMU context management stuff. */
 944         mmu_context_init();
 945
 946 #ifdef CONFIG_PPC64
 947         /* Interrupt code needs to be 64K-aligned. */
 948         if ((unsigned long)_stext & 0xffff)
 949                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 950                       (unsigned long)_stext);
 951 #endif
 952 }