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