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 <asm/io.h>
  39 #include <asm/paca.h>
  40 #include <asm/prom.h>
  41 #include <asm/processor.h>
  42 #include <asm/vdso_datapage.h>
  43 #include <asm/pgtable.h>
  44 #include <asm/smp.h>
  45 #include <asm/elf.h>
  46 #include <asm/machdep.h>
  47 #include <asm/time.h>
  48 #include <asm/cputable.h>
  49 #include <asm/sections.h>
  50 #include <asm/firmware.h>
  51 #include <asm/btext.h>
  52 #include <asm/nvram.h>
  53 #include <asm/setup.h>
  54 #include <asm/rtas.h>
  55 #include <asm/iommu.h>
  56 #include <asm/serial.h>
  57 #include <asm/cache.h>
  58 #include <asm/page.h>
  59 #include <asm/mmu.h>
  60 #include <asm/xmon.h>
  61 #include <asm/cputhreads.h>
  62 #include <mm/mmu_decl.h>
  63 #include <asm/fadump.h>
  64
  65 #ifdef DEBUG
  66 #include <asm/udbg.h>
  67 #define DBG(fmt...) udbg_printf(fmt)
  68 #else
  69 #define DBG(fmt...)
  70 #endif
  71
  72 /* The main machine-dep calls structure
  73  */
  74 struct machdep_calls ppc_md;
  75 EXPORT_SYMBOL(ppc_md);
  76 struct machdep_calls *machine_id;
  77 EXPORT_SYMBOL(machine_id);
  78
  79 unsigned long klimit = (unsigned long) _end;
  80
  81 char cmd_line[COMMAND_LINE_SIZE];
  82
  83 /*
  84  * This still seems to be needed... -- paulus
  85  */
  86 struct screen_info screen_info = {
  87         .orig_x = 0,
  88         .orig_y = 25,
  89         .orig_video_cols = 80,
  90         .orig_video_lines = 25,
  91         .orig_video_isVGA = 1,
  92         .orig_video_points = 16
  93 };
  94
  95 /* Variables required to store legacy IO irq routing */
  96 int of_i8042_kbd_irq;
  97 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
  98 int of_i8042_aux_irq;
  99 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 100
 101 #ifdef __DO_IRQ_CANON
 102 /* XXX should go elsewhere eventually */
 103 int ppc_do_canonicalize_irqs;
 104 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 105 #endif
 106
 107 /* also used by kexec */
 108 void machine_shutdown(void)
 109 {
 110 #ifdef CONFIG_FA_DUMP
 111         /*
 112          * if fadump is active, cleanup the fadump registration before we
 113          * shutdown.
 114          */
 115         fadump_cleanup();
 116 #endif
 117
 118         if (ppc_md.machine_shutdown)
 119                 ppc_md.machine_shutdown();
 120 }
 121
 122 void machine_restart(char *cmd)
 123 {
 124         machine_shutdown();
 125         if (ppc_md.restart)
 126                 ppc_md.restart(cmd);
 127 #ifdef CONFIG_SMP
 128         smp_send_stop();
 129 #endif
 130         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 131         local_irq_disable();
 132         while (1) ;
 133 }
 134
 135 void machine_power_off(void)
 136 {
 137         machine_shutdown();
 138         if (ppc_md.power_off)
 139                 ppc_md.power_off();
 140 #ifdef CONFIG_SMP
 141         smp_send_stop();
 142 #endif
 143         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 144         local_irq_disable();
 145         while (1) ;
 146 }
 147 /* Used by the G5 thermal driver */
 148 EXPORT_SYMBOL_GPL(machine_power_off);
 149
 150 void (*pm_power_off)(void) = machine_power_off;
 151 EXPORT_SYMBOL_GPL(pm_power_off);
 152
 153 void machine_halt(void)
 154 {
 155         machine_shutdown();
 156         if (ppc_md.halt)
 157                 ppc_md.halt();
 158 #ifdef CONFIG_SMP
 159         smp_send_stop();
 160 #endif
 161         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 162         local_irq_disable();
 163         while (1) ;
 164 }
 165
 166
 167 #ifdef CONFIG_TAU
 168 extern u32 cpu_temp(unsigned long cpu);
 169 extern u32 cpu_temp_both(unsigned long cpu);
 170 #endif /* CONFIG_TAU */
 171
 172 #ifdef CONFIG_SMP
 173 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 174 #endif
 175
 176 static void show_cpuinfo_summary(struct seq_file *m)
 177 {
 178         struct device_node *root;
 179         const char *model = NULL;
 180 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 181         unsigned long bogosum = 0;
 182         int i;
 183         for_each_online_cpu(i)
 184                 bogosum += loops_per_jiffy;
 185         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 186                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 187 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 188         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 189         if (ppc_md.name)
 190                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 191         root = of_find_node_by_path("/");
 192         if (root)
 193                 model = of_get_property(root, "model", NULL);
 194         if (model)
 195                 seq_printf(m, "model\t\t: %s\n", model);
 196         of_node_put(root);
 197
 198         if (ppc_md.show_cpuinfo != NULL)
 199                 ppc_md.show_cpuinfo(m);
 200
 201 #ifdef CONFIG_PPC32
 202         /* Display the amount of memory */
 203         seq_printf(m, "Memory\t\t: %d MB\n",
 204                    (unsigned int)(total_memory / (1024 * 1024)));
 205 #endif
 206 }
 207
 208 static int show_cpuinfo(struct seq_file *m, void *v)
 209 {
 210         unsigned long cpu_id = (unsigned long)v - 1;
 211         unsigned int pvr;
 212         unsigned short maj;
 213         unsigned short min;
 214
 215         /* We only show online cpus: disable preempt (overzealous, I
 216          * knew) to prevent cpu going down. */
 217         preempt_disable();
 218         if (!cpu_online(cpu_id)) {
 219                 preempt_enable();
 220                 return 0;
 221         }
 222
 223 #ifdef CONFIG_SMP
 224         pvr = per_cpu(cpu_pvr, cpu_id);
 225 #else
 226         pvr = mfspr(SPRN_PVR);
 227 #endif
 228         maj = (pvr >> 8) & 0xFF;
 229         min = pvr & 0xFF;
 230
 231         seq_printf(m, "processor\t: %lu\n", cpu_id);
 232         seq_printf(m, "cpu\t\t: ");
 233
 234         if (cur_cpu_spec->pvr_mask)
 235                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 236         else
 237                 seq_printf(m, "unknown (%08x)", pvr);
 238
 239 #ifdef CONFIG_ALTIVEC
 240         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 241                 seq_printf(m, ", altivec supported");
 242 #endif /* CONFIG_ALTIVEC */
 243
 244         seq_printf(m, "\n");
 245
 246 #ifdef CONFIG_TAU
 247         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 248 #ifdef CONFIG_TAU_AVERAGE
 249                 /* more straightforward, but potentially misleading */
 250                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 251                            cpu_temp(cpu_id));
 252 #else
 253                 /* show the actual temp sensor range */
 254                 u32 temp;
 255                 temp = cpu_temp_both(cpu_id);
 256                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 257                            temp & 0xff, temp >> 16);
 258 #endif
 259         }
 260 #endif /* CONFIG_TAU */
 261
 262         /*
 263          * Assume here that all clock rates are the same in a
 264          * smp system.  -- Cort
 265          */
 266         if (ppc_proc_freq)
 267                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 268                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 269
 270         if (ppc_md.show_percpuinfo != NULL)
 271                 ppc_md.show_percpuinfo(m, cpu_id);
 272
 273         /* If we are a Freescale core do a simple check so
 274          * we dont have to keep adding cases in the future */
 275         if (PVR_VER(pvr) & 0x8000) {
 276                 switch (PVR_VER(pvr)) {
 277                 case 0x8000:    /* 7441/7450/7451, Voyager */
 278                 case 0x8001:    /* 7445/7455, Apollo 6 */
 279                 case 0x8002:    /* 7447/7457, Apollo 7 */
 280                 case 0x8003:    /* 7447A, Apollo 7 PM */
 281                 case 0x8004:    /* 7448, Apollo 8 */
 282                 case 0x800c:    /* 7410, Nitro */
 283                         maj = ((pvr >> 8) & 0xF);
 284                         min = PVR_MIN(pvr);
 285                         break;
 286                 default:        /* e500/book-e */
 287                         maj = PVR_MAJ(pvr);
 288                         min = PVR_MIN(pvr);
 289                         break;
 290                 }
 291         } else {
 292                 switch (PVR_VER(pvr)) {
 293                         case 0x0020:    /* 403 family */
 294                                 maj = PVR_MAJ(pvr) + 1;
 295                                 min = PVR_MIN(pvr);
 296                                 break;
 297                         case 0x1008:    /* 740P/750P ?? */
 298                                 maj = ((pvr >> 8) & 0xFF) - 1;
 299                                 min = pvr & 0xFF;
 300                                 break;
 301                         default:
 302                                 maj = (pvr >> 8) & 0xFF;
 303                                 min = pvr & 0xFF;
 304                                 break;
 305                 }
 306         }
 307
 308         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 309                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 310
 311 #ifdef CONFIG_PPC32
 312         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 313                    loops_per_jiffy / (500000/HZ),
 314                    (loops_per_jiffy / (5000/HZ)) % 100);
 315 #endif
 316
 317 #ifdef CONFIG_SMP
 318         seq_printf(m, "\n");
 319 #endif
 320
 321         preempt_enable();
 322
 323         /* If this is the last cpu, print the summary */
 324         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 325                 show_cpuinfo_summary(m);
 326
 327         return 0;
 328 }
 329
 330 static void *c_start(struct seq_file *m, loff_t *pos)
 331 {
 332         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 333                 *pos = cpumask_first(cpu_online_mask);
 334         else
 335                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 336         if ((*pos) < nr_cpu_ids)
 337                 return (void *)(unsigned long)(*pos + 1);
 338         return NULL;
 339 }
 340
 341 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 342 {
 343         (*pos)++;
 344         return c_start(m, pos);
 345 }
 346
 347 static void c_stop(struct seq_file *m, void *v)
 348 {
 349 }
 350
 351 const struct seq_operations cpuinfo_op = {
 352         .start =c_start,
 353         .next = c_next,
 354         .stop = c_stop,
 355         .show = show_cpuinfo,
 356 };
 357
 358 void __init check_for_initrd(void)
 359 {
 360 #ifdef CONFIG_BLK_DEV_INITRD
 361         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 362             initrd_start, initrd_end);
 363
 364         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 365          * look sensible. If not, clear initrd reference.
 366          */
 367         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 368             initrd_end > initrd_start)
 369                 ROOT_DEV = Root_RAM0;
 370         else
 371                 initrd_start = initrd_end = 0;
 372
 373         if (initrd_start)
 374                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 375
 376         DBG(" <- check_for_initrd()\n");
 377 #endif /* CONFIG_BLK_DEV_INITRD */
 378 }
 379
 380 #ifdef CONFIG_SMP
 381
 382 int threads_per_core, threads_shift;
 383 cpumask_t threads_core_mask;
 384 EXPORT_SYMBOL_GPL(threads_per_core);
 385 EXPORT_SYMBOL_GPL(threads_shift);
 386 EXPORT_SYMBOL_GPL(threads_core_mask);
 387
 388 static void __init cpu_init_thread_core_maps(int tpc)
 389 {
 390         int i;
 391
 392         threads_per_core = tpc;
 393         cpumask_clear(&threads_core_mask);
 394
 395         /* This implementation only supports power of 2 number of threads
 396          * for simplicity and performance
 397          */
 398         threads_shift = ilog2(tpc);
 399         BUG_ON(tpc != (1 << threads_shift));
 400
 401         for (i = 0; i < tpc; i++)
 402                 cpumask_set_cpu(i, &threads_core_mask);
 403
 404         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 405                tpc, tpc > 1 ? "s" : "");
 406         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 407 }
 408
 409
 410 /**
 411  * setup_cpu_maps - initialize the following cpu maps:
 412  *                  cpu_possible_mask
 413  *                  cpu_present_mask
 414  *
 415  * Having the possible map set up early allows us to restrict allocations
 416  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 417  *
 418  * We do not initialize the online map here; cpus set their own bits in
 419  * cpu_online_mask as they come up.
 420  *
 421  * This function is valid only for Open Firmware systems.  finish_device_tree
 422  * must be called before using this.
 423  *
 424  * While we're here, we may as well set the "physical" cpu ids in the paca.
 425  *
 426  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 427  */
 428 void __init smp_setup_cpu_maps(void)
 429 {
 430         struct device_node *dn = NULL;
 431         int cpu = 0;
 432         int nthreads = 1;
 433
 434         DBG("smp_setup_cpu_maps()\n");
 435
 436         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 437                 const __be32 *intserv;
 438                 __be32 cpu_be;
 439                 int j, len;
 440
 441                 DBG("  * %s...\n", dn->full_name);
 442
 443                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 444                                 &len);
 445                 if (intserv) {
 446                         nthreads = len / sizeof(int);
 447                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 448                             nthreads);
 449                 } else {
 450                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 451                         intserv = of_get_property(dn, "reg", NULL);
 452                         if (!intserv) {
 453                                 cpu_be = cpu_to_be32(cpu);
 454                                 intserv = &cpu_be;      /* assume logical == phys */
 455                         }
 456                 }
 457
 458                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 459                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 460                             j, cpu, be32_to_cpu(intserv[j]));
 461                         set_cpu_present(cpu, true);
 462                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 463                         set_cpu_possible(cpu, true);
 464                         cpu++;
 465                 }
 466         }
 467
 468         /* If no SMT supported, nthreads is forced to 1 */
 469         if (!cpu_has_feature(CPU_FTR_SMT)) {
 470                 DBG("  SMT disabled ! nthreads forced to 1\n");
 471                 nthreads = 1;
 472         }
 473
 474 #ifdef CONFIG_PPC64
 475         /*
 476          * On pSeries LPAR, we need to know how many cpus
 477          * could possibly be added to this partition.
 478          */
 479         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 480             (dn = of_find_node_by_path("/rtas"))) {
 481                 int num_addr_cell, num_size_cell, maxcpus;
 482                 const unsigned int *ireg;
 483
 484                 num_addr_cell = of_n_addr_cells(dn);
 485                 num_size_cell = of_n_size_cells(dn);
 486
 487                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 488
 489                 if (!ireg)
 490                         goto out;
 491
 492                 maxcpus = ireg[num_addr_cell + num_size_cell];
 493
 494                 /* Double maxcpus for processors which have SMT capability */
 495                 if (cpu_has_feature(CPU_FTR_SMT))
 496                         maxcpus *= nthreads;
 497
 498                 if (maxcpus > nr_cpu_ids) {
 499                         printk(KERN_WARNING
 500                                "Partition configured for %d cpus, "
 501                                "operating system maximum is %d.\n",
 502                                maxcpus, nr_cpu_ids);
 503                         maxcpus = nr_cpu_ids;
 504                 } else
 505                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 506                                maxcpus);
 507
 508                 for (cpu = 0; cpu < maxcpus; cpu++)
 509                         set_cpu_possible(cpu, true);
 510         out:
 511                 of_node_put(dn);
 512         }
 513         vdso_data->processorCount = num_present_cpus();
 514 #endif /* CONFIG_PPC64 */
 515
 516         /* Initialize CPU <=> thread mapping/
 517          *
 518          * WARNING: We assume that the number of threads is the same for
 519          * every CPU in the system. If that is not the case, then some code
 520          * here will have to be reworked
 521          */
 522         cpu_init_thread_core_maps(nthreads);
 523
 524         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 525         setup_nr_cpu_ids();
 526
 527         free_unused_pacas();
 528 }
 529 #endif /* CONFIG_SMP */
 530
 531 #ifdef CONFIG_PCSPKR_PLATFORM
 532 static __init int add_pcspkr(void)
 533 {
 534         struct device_node *np;
 535         struct platform_device *pd;
 536         int ret;
 537
 538         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 539         of_node_put(np);
 540         if (!np)
 541                 return -ENODEV;
 542
 543         pd = platform_device_alloc("pcspkr", -1);
 544         if (!pd)
 545                 return -ENOMEM;
 546
 547         ret = platform_device_add(pd);
 548         if (ret)
 549                 platform_device_put(pd);
 550
 551         return ret;
 552 }
 553 device_initcall(add_pcspkr);
 554 #endif  /* CONFIG_PCSPKR_PLATFORM */
 555
 556 void probe_machine(void)
 557 {
 558         extern struct machdep_calls __machine_desc_start;
 559         extern struct machdep_calls __machine_desc_end;
 560
 561         /*
 562          * Iterate all ppc_md structures until we find the proper
 563          * one for the current machine type
 564          */
 565         DBG("Probing machine type ...\n");
 566
 567         for (machine_id = &__machine_desc_start;
 568              machine_id < &__machine_desc_end;
 569              machine_id++) {
 570                 DBG("  %s ...", machine_id->name);
 571                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 572                 if (ppc_md.probe()) {
 573                         DBG(" match !\n");
 574                         break;
 575                 }
 576                 DBG("\n");
 577         }
 578         /* What can we do if we didn't find ? */
 579         if (machine_id >= &__machine_desc_end) {
 580                 DBG("No suitable machine found !\n");
 581                 for (;;);
 582         }
 583
 584         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 585 }
 586
 587 /* Match a class of boards, not a specific device configuration. */
 588 int check_legacy_ioport(unsigned long base_port)
 589 {
 590         struct device_node *parent, *np = NULL;
 591         int ret = -ENODEV;
 592
 593         switch(base_port) {
 594         case I8042_DATA_REG:
 595                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 596                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 597                 if (np) {
 598                         parent = of_get_parent(np);
 599
 600                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 601                         if (!of_i8042_kbd_irq)
 602                                 of_i8042_kbd_irq = 1;
 603
 604                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 605                         if (!of_i8042_aux_irq)
 606                                 of_i8042_aux_irq = 12;
 607
 608                         of_node_put(np);
 609                         np = parent;
 610                         break;
 611                 }
 612                 np = of_find_node_by_type(NULL, "8042");
 613                 /* Pegasos has no device_type on its 8042 node, look for the
 614                  * name instead */
 615                 if (!np)
 616                         np = of_find_node_by_name(NULL, "8042");
 617                 if (np) {
 618                         of_i8042_kbd_irq = 1;
 619                         of_i8042_aux_irq = 12;
 620                 }
 621                 break;
 622         case FDC_BASE: /* FDC1 */
 623                 np = of_find_node_by_type(NULL, "fdc");
 624                 break;
 625         default:
 626                 /* ipmi is supposed to fail here */
 627                 break;
 628         }
 629         if (!np)
 630                 return ret;
 631         parent = of_get_parent(np);
 632         if (parent) {
 633                 if (strcmp(parent->type, "isa") == 0)
 634                         ret = 0;
 635                 of_node_put(parent);
 636         }
 637         of_node_put(np);
 638         return ret;
 639 }
 640 EXPORT_SYMBOL(check_legacy_ioport);
 641
 642 static int ppc_panic_event(struct notifier_block *this,
 643                              unsigned long event, void *ptr)
 644 {
 645         /*
 646          * If firmware-assisted dump has been registered then trigger
 647          * firmware-assisted dump and let firmware handle everything else.
 648          */
 649         crash_fadump(NULL, ptr);
 650         ppc_md.panic(ptr);  /* May not return */
 651         return NOTIFY_DONE;
 652 }
 653
 654 static struct notifier_block ppc_panic_block = {
 655         .notifier_call = ppc_panic_event,
 656         .priority = INT_MIN /* may not return; must be done last */
 657 };
 658
 659 void __init setup_panic(void)
 660 {
 661         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 662 }
 663
 664 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 665 /*
 666  * For platforms that have configurable cache-coherency.  This function
 667  * checks that the cache coherency setting of the kernel matches the setting
 668  * left by the firmware, as indicated in the device tree.  Since a mismatch
 669  * will eventually result in DMA failures, we print * and error and call
 670  * BUG() in that case.
 671  */
 672
 673 #ifdef CONFIG_NOT_COHERENT_CACHE
 674 #define KERNEL_COHERENCY        0
 675 #else
 676 #define KERNEL_COHERENCY        1
 677 #endif
 678
 679 static int __init check_cache_coherency(void)
 680 {
 681         struct device_node *np;
 682         const void *prop;
 683         int devtree_coherency;
 684
 685         np = of_find_node_by_path("/");
 686         prop = of_get_property(np, "coherency-off", NULL);
 687         of_node_put(np);
 688
 689         devtree_coherency = prop ? 0 : 1;
 690
 691         if (devtree_coherency != KERNEL_COHERENCY) {
 692                 printk(KERN_ERR
 693                         "kernel coherency:%s != device tree_coherency:%s\n",
 694                         KERNEL_COHERENCY ? "on" : "off",
 695                         devtree_coherency ? "on" : "off");
 696                 BUG();
 697         }
 698
 699         return 0;
 700 }
 701
 702 late_initcall(check_cache_coherency);
 703 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 704
 705 #ifdef CONFIG_DEBUG_FS
 706 struct dentry *powerpc_debugfs_root;
 707 EXPORT_SYMBOL(powerpc_debugfs_root);
 708
 709 static int powerpc_debugfs_init(void)
 710 {
 711         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 712
 713         return powerpc_debugfs_root == NULL;
 714 }
 715 arch_initcall(powerpc_debugfs_init);
 716 #endif
 717
 718 #ifdef CONFIG_BOOKE_WDT
 719 extern u32 booke_wdt_enabled;
 720 extern u32 booke_wdt_period;
 721
 722 /* Checks wdt=x and wdt_period=xx command-line option */
 723 notrace int __init early_parse_wdt(char *p)
 724 {
 725         if (p && strncmp(p, "0", 1) != 0)
 726                 booke_wdt_enabled = 1;
 727
 728         return 0;
 729 }
 730 early_param("wdt", early_parse_wdt);
 731
 732 int __init early_parse_wdt_period(char *p)
 733 {
 734         unsigned long ret;
 735         if (p) {
 736                 if (!kstrtol(p, 0, &ret))
 737                         booke_wdt_period = ret;
 738         }
 739
 740         return 0;
 741 }
 742 early_param("wdt_period", early_parse_wdt_period);
 743 #endif  /* CONFIG_BOOKE_WDT */
 744
 745 void ppc_printk_progress(char *s, unsigned short hex)
 746 {
 747         pr_info("%s\n", s);
 748 }
 749
 750 void arch_setup_pdev_archdata(struct platform_device *pdev)
 751 {
 752         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 753         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 754         set_dma_ops(&pdev->dev, &dma_direct_ops);
 755 }