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