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 int boot_cpuid = -1;
  80 EXPORT_SYMBOL_GPL(boot_cpuid);
  81
  82 unsigned long klimit = (unsigned long) _end;
  83
  84 char cmd_line[COMMAND_LINE_SIZE];
  85
  86 /*
  87  * This still seems to be needed... -- paulus
  88  */
  89 struct screen_info screen_info = {
  90         .orig_x = 0,
  91         .orig_y = 25,
  92         .orig_video_cols = 80,
  93         .orig_video_lines = 25,
  94         .orig_video_isVGA = 1,
  95         .orig_video_points = 16
  96 };
  97
  98 /* Variables required to store legacy IO irq routing */
  99 int of_i8042_kbd_irq;
 100 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 101 int of_i8042_aux_irq;
 102 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 103
 104 #ifdef __DO_IRQ_CANON
 105 /* XXX should go elsewhere eventually */
 106 int ppc_do_canonicalize_irqs;
 107 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 108 #endif
 109
 110 /* also used by kexec */
 111 void machine_shutdown(void)
 112 {
 113 #ifdef CONFIG_FA_DUMP
 114         /*
 115          * if fadump is active, cleanup the fadump registration before we
 116          * shutdown.
 117          */
 118         fadump_cleanup();
 119 #endif
 120
 121         if (ppc_md.machine_shutdown)
 122                 ppc_md.machine_shutdown();
 123 }
 124
 125 void machine_restart(char *cmd)
 126 {
 127         machine_shutdown();
 128         if (ppc_md.restart)
 129                 ppc_md.restart(cmd);
 130 #ifdef CONFIG_SMP
 131         smp_send_stop();
 132 #endif
 133         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 134         local_irq_disable();
 135         while (1) ;
 136 }
 137
 138 void machine_power_off(void)
 139 {
 140         machine_shutdown();
 141         if (ppc_md.power_off)
 142                 ppc_md.power_off();
 143 #ifdef CONFIG_SMP
 144         smp_send_stop();
 145 #endif
 146         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 147         local_irq_disable();
 148         while (1) ;
 149 }
 150 /* Used by the G5 thermal driver */
 151 EXPORT_SYMBOL_GPL(machine_power_off);
 152
 153 void (*pm_power_off)(void) = machine_power_off;
 154 EXPORT_SYMBOL_GPL(pm_power_off);
 155
 156 void machine_halt(void)
 157 {
 158         machine_shutdown();
 159         if (ppc_md.halt)
 160                 ppc_md.halt();
 161 #ifdef CONFIG_SMP
 162         smp_send_stop();
 163 #endif
 164         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 165         local_irq_disable();
 166         while (1) ;
 167 }
 168
 169
 170 #ifdef CONFIG_TAU
 171 extern u32 cpu_temp(unsigned long cpu);
 172 extern u32 cpu_temp_both(unsigned long cpu);
 173 #endif /* CONFIG_TAU */
 174
 175 #ifdef CONFIG_SMP
 176 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 177 #endif
 178
 179 static void show_cpuinfo_summary(struct seq_file *m)
 180 {
 181         struct device_node *root;
 182         const char *model = NULL;
 183 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 184         unsigned long bogosum = 0;
 185         int i;
 186         for_each_online_cpu(i)
 187                 bogosum += loops_per_jiffy;
 188         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 189                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 190 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 191         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 192         if (ppc_md.name)
 193                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 194         root = of_find_node_by_path("/");
 195         if (root)
 196                 model = of_get_property(root, "model", NULL);
 197         if (model)
 198                 seq_printf(m, "model\t\t: %s\n", model);
 199         of_node_put(root);
 200
 201         if (ppc_md.show_cpuinfo != NULL)
 202                 ppc_md.show_cpuinfo(m);
 203
 204 #ifdef CONFIG_PPC32
 205         /* Display the amount of memory */
 206         seq_printf(m, "Memory\t\t: %d MB\n",
 207                    (unsigned int)(total_memory / (1024 * 1024)));
 208 #endif
 209 }
 210
 211 static int show_cpuinfo(struct seq_file *m, void *v)
 212 {
 213         unsigned long cpu_id = (unsigned long)v - 1;
 214         unsigned int pvr;
 215         unsigned short maj;
 216         unsigned short min;
 217
 218         /* We only show online cpus: disable preempt (overzealous, I
 219          * knew) to prevent cpu going down. */
 220         preempt_disable();
 221         if (!cpu_online(cpu_id)) {
 222                 preempt_enable();
 223                 return 0;
 224         }
 225
 226 #ifdef CONFIG_SMP
 227         pvr = per_cpu(cpu_pvr, cpu_id);
 228 #else
 229         pvr = mfspr(SPRN_PVR);
 230 #endif
 231         maj = (pvr >> 8) & 0xFF;
 232         min = pvr & 0xFF;
 233
 234         seq_printf(m, "processor\t: %lu\n", cpu_id);
 235         seq_printf(m, "cpu\t\t: ");
 236
 237         if (cur_cpu_spec->pvr_mask)
 238                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 239         else
 240                 seq_printf(m, "unknown (%08x)", pvr);
 241
 242 #ifdef CONFIG_ALTIVEC
 243         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 244                 seq_printf(m, ", altivec supported");
 245 #endif /* CONFIG_ALTIVEC */
 246
 247         seq_printf(m, "\n");
 248
 249 #ifdef CONFIG_TAU
 250         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 251 #ifdef CONFIG_TAU_AVERAGE
 252                 /* more straightforward, but potentially misleading */
 253                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 254                            cpu_temp(cpu_id));
 255 #else
 256                 /* show the actual temp sensor range */
 257                 u32 temp;
 258                 temp = cpu_temp_both(cpu_id);
 259                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 260                            temp & 0xff, temp >> 16);
 261 #endif
 262         }
 263 #endif /* CONFIG_TAU */
 264
 265         /*
 266          * Assume here that all clock rates are the same in a
 267          * smp system.  -- Cort
 268          */
 269         if (ppc_proc_freq)
 270                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 271                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 272
 273         if (ppc_md.show_percpuinfo != NULL)
 274                 ppc_md.show_percpuinfo(m, cpu_id);
 275
 276         /* If we are a Freescale core do a simple check so
 277          * we dont have to keep adding cases in the future */
 278         if (PVR_VER(pvr) & 0x8000) {
 279                 switch (PVR_VER(pvr)) {
 280                 case 0x8000:    /* 7441/7450/7451, Voyager */
 281                 case 0x8001:    /* 7445/7455, Apollo 6 */
 282                 case 0x8002:    /* 7447/7457, Apollo 7 */
 283                 case 0x8003:    /* 7447A, Apollo 7 PM */
 284                 case 0x8004:    /* 7448, Apollo 8 */
 285                 case 0x800c:    /* 7410, Nitro */
 286                         maj = ((pvr >> 8) & 0xF);
 287                         min = PVR_MIN(pvr);
 288                         break;
 289                 default:        /* e500/book-e */
 290                         maj = PVR_MAJ(pvr);
 291                         min = PVR_MIN(pvr);
 292                         break;
 293                 }
 294         } else {
 295                 switch (PVR_VER(pvr)) {
 296                         case 0x0020:    /* 403 family */
 297                                 maj = PVR_MAJ(pvr) + 1;
 298                                 min = PVR_MIN(pvr);
 299                                 break;
 300                         case 0x1008:    /* 740P/750P ?? */
 301                                 maj = ((pvr >> 8) & 0xFF) - 1;
 302                                 min = pvr & 0xFF;
 303                                 break;
 304                         default:
 305                                 maj = (pvr >> 8) & 0xFF;
 306                                 min = pvr & 0xFF;
 307                                 break;
 308                 }
 309         }
 310
 311         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 312                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 313
 314 #ifdef CONFIG_PPC32
 315         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 316                    loops_per_jiffy / (500000/HZ),
 317                    (loops_per_jiffy / (5000/HZ)) % 100);
 318 #endif
 319
 320 #ifdef CONFIG_SMP
 321         seq_printf(m, "\n");
 322 #endif
 323
 324         preempt_enable();
 325
 326         /* If this is the last cpu, print the summary */
 327         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 328                 show_cpuinfo_summary(m);
 329
 330         return 0;
 331 }
 332
 333 static void *c_start(struct seq_file *m, loff_t *pos)
 334 {
 335         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 336                 *pos = cpumask_first(cpu_online_mask);
 337         else
 338                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 339         if ((*pos) < nr_cpu_ids)
 340                 return (void *)(unsigned long)(*pos + 1);
 341         return NULL;
 342 }
 343
 344 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 345 {
 346         (*pos)++;
 347         return c_start(m, pos);
 348 }
 349
 350 static void c_stop(struct seq_file *m, void *v)
 351 {
 352 }
 353
 354 const struct seq_operations cpuinfo_op = {
 355         .start =c_start,
 356         .next = c_next,
 357         .stop = c_stop,
 358         .show = show_cpuinfo,
 359 };
 360
 361 void __init check_for_initrd(void)
 362 {
 363 #ifdef CONFIG_BLK_DEV_INITRD
 364         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 365             initrd_start, initrd_end);
 366
 367         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 368          * look sensible. If not, clear initrd reference.
 369          */
 370         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 371             initrd_end > initrd_start)
 372                 ROOT_DEV = Root_RAM0;
 373         else
 374                 initrd_start = initrd_end = 0;
 375
 376         if (initrd_start)
 377                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 378
 379         DBG(" <- check_for_initrd()\n");
 380 #endif /* CONFIG_BLK_DEV_INITRD */
 381 }
 382
 383 #ifdef CONFIG_SMP
 384
 385 int threads_per_core, threads_shift;
 386 cpumask_t threads_core_mask;
 387 EXPORT_SYMBOL_GPL(threads_per_core);
 388 EXPORT_SYMBOL_GPL(threads_shift);
 389 EXPORT_SYMBOL_GPL(threads_core_mask);
 390
 391 static void __init cpu_init_thread_core_maps(int tpc)
 392 {
 393         int i;
 394
 395         threads_per_core = tpc;
 396         cpumask_clear(&threads_core_mask);
 397
 398         /* This implementation only supports power of 2 number of threads
 399          * for simplicity and performance
 400          */
 401         threads_shift = ilog2(tpc);
 402         BUG_ON(tpc != (1 << threads_shift));
 403
 404         for (i = 0; i < tpc; i++)
 405                 cpumask_set_cpu(i, &threads_core_mask);
 406
 407         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 408                tpc, tpc > 1 ? "s" : "");
 409         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 410 }
 411
 412
 413 /**
 414  * setup_cpu_maps - initialize the following cpu maps:
 415  *                  cpu_possible_mask
 416  *                  cpu_present_mask
 417  *
 418  * Having the possible map set up early allows us to restrict allocations
 419  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 420  *
 421  * We do not initialize the online map here; cpus set their own bits in
 422  * cpu_online_mask as they come up.
 423  *
 424  * This function is valid only for Open Firmware systems.  finish_device_tree
 425  * must be called before using this.
 426  *
 427  * While we're here, we may as well set the "physical" cpu ids in the paca.
 428  *
 429  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 430  */
 431 void __init smp_setup_cpu_maps(void)
 432 {
 433         struct device_node *dn = NULL;
 434         int cpu = 0;
 435         int nthreads = 1;
 436
 437         DBG("smp_setup_cpu_maps()\n");
 438
 439         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 440                 const __be32 *intserv;
 441                 __be32 cpu_be;
 442                 int j, len;
 443
 444                 DBG("  * %s...\n", dn->full_name);
 445
 446                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 447                                 &len);
 448                 if (intserv) {
 449                         nthreads = len / sizeof(int);
 450                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 451                             nthreads);
 452                 } else {
 453                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 454                         intserv = of_get_property(dn, "reg", NULL);
 455                         if (!intserv) {
 456                                 cpu_be = cpu_to_be32(cpu);
 457                                 intserv = &cpu_be;      /* assume logical == phys */
 458                         }
 459                 }
 460
 461                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 462                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 463                             j, cpu, be32_to_cpu(intserv[j]));
 464                         set_cpu_present(cpu, true);
 465                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 466                         set_cpu_possible(cpu, true);
 467                         cpu++;
 468                 }
 469         }
 470
 471         /* If no SMT supported, nthreads is forced to 1 */
 472         if (!cpu_has_feature(CPU_FTR_SMT)) {
 473                 DBG("  SMT disabled ! nthreads forced to 1\n");
 474                 nthreads = 1;
 475         }
 476
 477 #ifdef CONFIG_PPC64
 478         /*
 479          * On pSeries LPAR, we need to know how many cpus
 480          * could possibly be added to this partition.
 481          */
 482         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 483             (dn = of_find_node_by_path("/rtas"))) {
 484                 int num_addr_cell, num_size_cell, maxcpus;
 485                 const __be32 *ireg;
 486
 487                 num_addr_cell = of_n_addr_cells(dn);
 488                 num_size_cell = of_n_size_cells(dn);
 489
 490                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 491
 492                 if (!ireg)
 493                         goto out;
 494
 495                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 496
 497                 /* Double maxcpus for processors which have SMT capability */
 498                 if (cpu_has_feature(CPU_FTR_SMT))
 499                         maxcpus *= nthreads;
 500
 501                 if (maxcpus > nr_cpu_ids) {
 502                         printk(KERN_WARNING
 503                                "Partition configured for %d cpus, "
 504                                "operating system maximum is %d.\n",
 505                                maxcpus, nr_cpu_ids);
 506                         maxcpus = nr_cpu_ids;
 507                 } else
 508                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 509                                maxcpus);
 510
 511                 for (cpu = 0; cpu < maxcpus; cpu++)
 512                         set_cpu_possible(cpu, true);
 513         out:
 514                 of_node_put(dn);
 515         }
 516         vdso_data->processorCount = num_present_cpus();
 517 #endif /* CONFIG_PPC64 */
 518
 519         /* Initialize CPU <=> thread mapping/
 520          *
 521          * WARNING: We assume that the number of threads is the same for
 522          * every CPU in the system. If that is not the case, then some code
 523          * here will have to be reworked
 524          */
 525         cpu_init_thread_core_maps(nthreads);
 526
 527         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 528         setup_nr_cpu_ids();
 529
 530         free_unused_pacas();
 531 }
 532 #endif /* CONFIG_SMP */
 533
 534 #ifdef CONFIG_PCSPKR_PLATFORM
 535 static __init int add_pcspkr(void)
 536 {
 537         struct device_node *np;
 538         struct platform_device *pd;
 539         int ret;
 540
 541         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 542         of_node_put(np);
 543         if (!np)
 544                 return -ENODEV;
 545
 546         pd = platform_device_alloc("pcspkr", -1);
 547         if (!pd)
 548                 return -ENOMEM;
 549
 550         ret = platform_device_add(pd);
 551         if (ret)
 552                 platform_device_put(pd);
 553
 554         return ret;
 555 }
 556 device_initcall(add_pcspkr);
 557 #endif  /* CONFIG_PCSPKR_PLATFORM */
 558
 559 void probe_machine(void)
 560 {
 561         extern struct machdep_calls __machine_desc_start;
 562         extern struct machdep_calls __machine_desc_end;
 563
 564         /*
 565          * Iterate all ppc_md structures until we find the proper
 566          * one for the current machine type
 567          */
 568         DBG("Probing machine type ...\n");
 569
 570         for (machine_id = &__machine_desc_start;
 571              machine_id < &__machine_desc_end;
 572              machine_id++) {
 573                 DBG("  %s ...", machine_id->name);
 574                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 575                 if (ppc_md.probe()) {
 576                         DBG(" match !\n");
 577                         break;
 578                 }
 579                 DBG("\n");
 580         }
 581         /* What can we do if we didn't find ? */
 582         if (machine_id >= &__machine_desc_end) {
 583                 DBG("No suitable machine found !\n");
 584                 for (;;);
 585         }
 586
 587         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 588 }
 589
 590 /* Match a class of boards, not a specific device configuration. */
 591 int check_legacy_ioport(unsigned long base_port)
 592 {
 593         struct device_node *parent, *np = NULL;
 594         int ret = -ENODEV;
 595
 596         switch(base_port) {
 597         case I8042_DATA_REG:
 598                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 599                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 600                 if (np) {
 601                         parent = of_get_parent(np);
 602
 603                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 604                         if (!of_i8042_kbd_irq)
 605                                 of_i8042_kbd_irq = 1;
 606
 607                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 608                         if (!of_i8042_aux_irq)
 609                                 of_i8042_aux_irq = 12;
 610
 611                         of_node_put(np);
 612                         np = parent;
 613                         break;
 614                 }
 615                 np = of_find_node_by_type(NULL, "8042");
 616                 /* Pegasos has no device_type on its 8042 node, look for the
 617                  * name instead */
 618                 if (!np)
 619                         np = of_find_node_by_name(NULL, "8042");
 620                 if (np) {
 621                         of_i8042_kbd_irq = 1;
 622                         of_i8042_aux_irq = 12;
 623                 }
 624                 break;
 625         case FDC_BASE: /* FDC1 */
 626                 np = of_find_node_by_type(NULL, "fdc");
 627                 break;
 628         default:
 629                 /* ipmi is supposed to fail here */
 630                 break;
 631         }
 632         if (!np)
 633                 return ret;
 634         parent = of_get_parent(np);
 635         if (parent) {
 636                 if (strcmp(parent->type, "isa") == 0)
 637                         ret = 0;
 638                 of_node_put(parent);
 639         }
 640         of_node_put(np);
 641         return ret;
 642 }
 643 EXPORT_SYMBOL(check_legacy_ioport);
 644
 645 static int ppc_panic_event(struct notifier_block *this,
 646                              unsigned long event, void *ptr)
 647 {
 648         /*
 649          * If firmware-assisted dump has been registered then trigger
 650          * firmware-assisted dump and let firmware handle everything else.
 651          */
 652         crash_fadump(NULL, ptr);
 653         ppc_md.panic(ptr);  /* May not return */
 654         return NOTIFY_DONE;
 655 }
 656
 657 static struct notifier_block ppc_panic_block = {
 658         .notifier_call = ppc_panic_event,
 659         .priority = INT_MIN /* may not return; must be done last */
 660 };
 661
 662 void __init setup_panic(void)
 663 {
 664         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 665 }
 666
 667 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 668 /*
 669  * For platforms that have configurable cache-coherency.  This function
 670  * checks that the cache coherency setting of the kernel matches the setting
 671  * left by the firmware, as indicated in the device tree.  Since a mismatch
 672  * will eventually result in DMA failures, we print * and error and call
 673  * BUG() in that case.
 674  */
 675
 676 #ifdef CONFIG_NOT_COHERENT_CACHE
 677 #define KERNEL_COHERENCY        0
 678 #else
 679 #define KERNEL_COHERENCY        1
 680 #endif
 681
 682 static int __init check_cache_coherency(void)
 683 {
 684         struct device_node *np;
 685         const void *prop;
 686         int devtree_coherency;
 687
 688         np = of_find_node_by_path("/");
 689         prop = of_get_property(np, "coherency-off", NULL);
 690         of_node_put(np);
 691
 692         devtree_coherency = prop ? 0 : 1;
 693
 694         if (devtree_coherency != KERNEL_COHERENCY) {
 695                 printk(KERN_ERR
 696                         "kernel coherency:%s != device tree_coherency:%s\n",
 697                         KERNEL_COHERENCY ? "on" : "off",
 698                         devtree_coherency ? "on" : "off");
 699                 BUG();
 700         }
 701
 702         return 0;
 703 }
 704
 705 late_initcall(check_cache_coherency);
 706 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 707
 708 #ifdef CONFIG_DEBUG_FS
 709 struct dentry *powerpc_debugfs_root;
 710 EXPORT_SYMBOL(powerpc_debugfs_root);
 711
 712 static int powerpc_debugfs_init(void)
 713 {
 714         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 715
 716         return powerpc_debugfs_root == NULL;
 717 }
 718 arch_initcall(powerpc_debugfs_init);
 719 #endif
 720
 721 #ifdef CONFIG_BOOKE_WDT
 722 extern u32 booke_wdt_enabled;
 723 extern u32 booke_wdt_period;
 724
 725 /* Checks wdt=x and wdt_period=xx command-line option */
 726 notrace int __init early_parse_wdt(char *p)
 727 {
 728         if (p && strncmp(p, "0", 1) != 0)
 729                 booke_wdt_enabled = 1;
 730
 731         return 0;
 732 }
 733 early_param("wdt", early_parse_wdt);
 734
 735 int __init early_parse_wdt_period(char *p)
 736 {
 737         unsigned long ret;
 738         if (p) {
 739                 if (!kstrtol(p, 0, &ret))
 740                         booke_wdt_period = ret;
 741         }
 742
 743         return 0;
 744 }
 745 early_param("wdt_period", early_parse_wdt_period);
 746 #endif  /* CONFIG_BOOKE_WDT */
 747
 748 void ppc_printk_progress(char *s, unsigned short hex)
 749 {
 750         pr_info("%s\n", s);
 751 }
 752
 753 void arch_setup_pdev_archdata(struct platform_device *pdev)
 754 {
 755         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 756         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 757         set_dma_ops(&pdev->dev, &dma_direct_ops);
 758 }