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 #include "setup.h"
  66
  67 #ifdef DEBUG
  68 #include <asm/udbg.h>
  69 #define DBG(fmt...) udbg_printf(fmt)
  70 #else
  71 #define DBG(fmt...)
  72 #endif
  73
  74 /* The main machine-dep calls structure
  75  */
  76 struct machdep_calls ppc_md;
  77 EXPORT_SYMBOL(ppc_md);
  78 struct machdep_calls *machine_id;
  79 EXPORT_SYMBOL(machine_id);
  80
  81 unsigned long klimit = (unsigned long) _end;
  82
  83 char cmd_line[COMMAND_LINE_SIZE];
  84
  85 /*
  86  * This still seems to be needed... -- paulus
  87  */
  88 struct screen_info screen_info = {
  89         .orig_x = 0,
  90         .orig_y = 25,
  91         .orig_video_cols = 80,
  92         .orig_video_lines = 25,
  93         .orig_video_isVGA = 1,
  94         .orig_video_points = 16
  95 };
  96
  97 /* Variables required to store legacy IO irq routing */
  98 int of_i8042_kbd_irq;
  99 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 100 int of_i8042_aux_irq;
 101 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 102
 103 #ifdef __DO_IRQ_CANON
 104 /* XXX should go elsewhere eventually */
 105 int ppc_do_canonicalize_irqs;
 106 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 107 #endif
 108
 109 /* also used by kexec */
 110 void machine_shutdown(void)
 111 {
 112 #ifdef CONFIG_FA_DUMP
 113         /*
 114          * if fadump is active, cleanup the fadump registration before we
 115          * shutdown.
 116          */
 117         fadump_cleanup();
 118 #endif
 119
 120         if (ppc_md.machine_shutdown)
 121                 ppc_md.machine_shutdown();
 122 }
 123
 124 void machine_restart(char *cmd)
 125 {
 126         machine_shutdown();
 127         if (ppc_md.restart)
 128                 ppc_md.restart(cmd);
 129 #ifdef CONFIG_SMP
 130         smp_send_stop();
 131 #endif
 132         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 133         local_irq_disable();
 134         while (1) ;
 135 }
 136
 137 void machine_power_off(void)
 138 {
 139         machine_shutdown();
 140         if (ppc_md.power_off)
 141                 ppc_md.power_off();
 142 #ifdef CONFIG_SMP
 143         smp_send_stop();
 144 #endif
 145         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 146         local_irq_disable();
 147         while (1) ;
 148 }
 149 /* Used by the G5 thermal driver */
 150 EXPORT_SYMBOL_GPL(machine_power_off);
 151
 152 void (*pm_power_off)(void) = machine_power_off;
 153 EXPORT_SYMBOL_GPL(pm_power_off);
 154
 155 void machine_halt(void)
 156 {
 157         machine_shutdown();
 158         if (ppc_md.halt)
 159                 ppc_md.halt();
 160 #ifdef CONFIG_SMP
 161         smp_send_stop();
 162 #endif
 163         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 164         local_irq_disable();
 165         while (1) ;
 166 }
 167
 168
 169 #ifdef CONFIG_TAU
 170 extern u32 cpu_temp(unsigned long cpu);
 171 extern u32 cpu_temp_both(unsigned long cpu);
 172 #endif /* CONFIG_TAU */
 173
 174 #ifdef CONFIG_SMP
 175 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 176 #endif
 177
 178 static void show_cpuinfo_summary(struct seq_file *m)
 179 {
 180         struct device_node *root;
 181         const char *model = NULL;
 182 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 183         unsigned long bogosum = 0;
 184         int i;
 185         for_each_online_cpu(i)
 186                 bogosum += loops_per_jiffy;
 187         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 188                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 189 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 190         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 191         if (ppc_md.name)
 192                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 193         root = of_find_node_by_path("/");
 194         if (root)
 195                 model = of_get_property(root, "model", NULL);
 196         if (model)
 197                 seq_printf(m, "model\t\t: %s\n", model);
 198         of_node_put(root);
 199
 200         if (ppc_md.show_cpuinfo != NULL)
 201                 ppc_md.show_cpuinfo(m);
 202
 203 #ifdef CONFIG_PPC32
 204         /* Display the amount of memory */
 205         seq_printf(m, "Memory\t\t: %d MB\n",
 206                    (unsigned int)(total_memory / (1024 * 1024)));
 207 #endif
 208 }
 209
 210 static int show_cpuinfo(struct seq_file *m, void *v)
 211 {
 212         unsigned long cpu_id = (unsigned long)v - 1;
 213         unsigned int pvr;
 214         unsigned short maj;
 215         unsigned short min;
 216
 217         /* We only show online cpus: disable preempt (overzealous, I
 218          * knew) to prevent cpu going down. */
 219         preempt_disable();
 220         if (!cpu_online(cpu_id)) {
 221                 preempt_enable();
 222                 return 0;
 223         }
 224
 225 #ifdef CONFIG_SMP
 226         pvr = per_cpu(cpu_pvr, cpu_id);
 227 #else
 228         pvr = mfspr(SPRN_PVR);
 229 #endif
 230         maj = (pvr >> 8) & 0xFF;
 231         min = pvr & 0xFF;
 232
 233         seq_printf(m, "processor\t: %lu\n", cpu_id);
 234         seq_printf(m, "cpu\t\t: ");
 235
 236         if (cur_cpu_spec->pvr_mask)
 237                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 238         else
 239                 seq_printf(m, "unknown (%08x)", pvr);
 240
 241 #ifdef CONFIG_ALTIVEC
 242         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 243                 seq_printf(m, ", altivec supported");
 244 #endif /* CONFIG_ALTIVEC */
 245
 246         seq_printf(m, "\n");
 247
 248 #ifdef CONFIG_TAU
 249         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 250 #ifdef CONFIG_TAU_AVERAGE
 251                 /* more straightforward, but potentially misleading */
 252                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 253                            cpu_temp(cpu_id));
 254 #else
 255                 /* show the actual temp sensor range */
 256                 u32 temp;
 257                 temp = cpu_temp_both(cpu_id);
 258                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 259                            temp & 0xff, temp >> 16);
 260 #endif
 261         }
 262 #endif /* CONFIG_TAU */
 263
 264         /*
 265          * Assume here that all clock rates are the same in a
 266          * smp system.  -- Cort
 267          */
 268         if (ppc_proc_freq)
 269                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 270                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 271
 272         if (ppc_md.show_percpuinfo != NULL)
 273                 ppc_md.show_percpuinfo(m, cpu_id);
 274
 275         /* If we are a Freescale core do a simple check so
 276          * we dont have to keep adding cases in the future */
 277         if (PVR_VER(pvr) & 0x8000) {
 278                 switch (PVR_VER(pvr)) {
 279                 case 0x8000:    /* 7441/7450/7451, Voyager */
 280                 case 0x8001:    /* 7445/7455, Apollo 6 */
 281                 case 0x8002:    /* 7447/7457, Apollo 7 */
 282                 case 0x8003:    /* 7447A, Apollo 7 PM */
 283                 case 0x8004:    /* 7448, Apollo 8 */
 284                 case 0x800c:    /* 7410, Nitro */
 285                         maj = ((pvr >> 8) & 0xF);
 286                         min = PVR_MIN(pvr);
 287                         break;
 288                 default:        /* e500/book-e */
 289                         maj = PVR_MAJ(pvr);
 290                         min = PVR_MIN(pvr);
 291                         break;
 292                 }
 293         } else {
 294                 switch (PVR_VER(pvr)) {
 295                         case 0x0020:    /* 403 family */
 296                                 maj = PVR_MAJ(pvr) + 1;
 297                                 min = PVR_MIN(pvr);
 298                                 break;
 299                         case 0x1008:    /* 740P/750P ?? */
 300                                 maj = ((pvr >> 8) & 0xFF) - 1;
 301                                 min = pvr & 0xFF;
 302                                 break;
 303                         default:
 304                                 maj = (pvr >> 8) & 0xFF;
 305                                 min = pvr & 0xFF;
 306                                 break;
 307                 }
 308         }
 309
 310         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 311                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 312
 313 #ifdef CONFIG_PPC32
 314         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 315                    loops_per_jiffy / (500000/HZ),
 316                    (loops_per_jiffy / (5000/HZ)) % 100);
 317 #endif
 318
 319 #ifdef CONFIG_SMP
 320         seq_printf(m, "\n");
 321 #endif
 322
 323         preempt_enable();
 324
 325         /* If this is the last cpu, print the summary */
 326         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 327                 show_cpuinfo_summary(m);
 328
 329         return 0;
 330 }
 331
 332 static void *c_start(struct seq_file *m, loff_t *pos)
 333 {
 334         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 335                 *pos = cpumask_first(cpu_online_mask);
 336         else
 337                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 338         if ((*pos) < nr_cpu_ids)
 339                 return (void *)(unsigned long)(*pos + 1);
 340         return NULL;
 341 }
 342
 343 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 344 {
 345         (*pos)++;
 346         return c_start(m, pos);
 347 }
 348
 349 static void c_stop(struct seq_file *m, void *v)
 350 {
 351 }
 352
 353 const struct seq_operations cpuinfo_op = {
 354         .start =c_start,
 355         .next = c_next,
 356         .stop = c_stop,
 357         .show = show_cpuinfo,
 358 };
 359
 360 void __init check_for_initrd(void)
 361 {
 362 #ifdef CONFIG_BLK_DEV_INITRD
 363         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 364             initrd_start, initrd_end);
 365
 366         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 367          * look sensible. If not, clear initrd reference.
 368          */
 369         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 370             initrd_end > initrd_start)
 371                 ROOT_DEV = Root_RAM0;
 372         else
 373                 initrd_start = initrd_end = 0;
 374
 375         if (initrd_start)
 376                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 377
 378         DBG(" <- check_for_initrd()\n");
 379 #endif /* CONFIG_BLK_DEV_INITRD */
 380 }
 381
 382 #ifdef CONFIG_SMP
 383
 384 int threads_per_core, threads_shift;
 385 cpumask_t threads_core_mask;
 386 EXPORT_SYMBOL_GPL(threads_per_core);
 387 EXPORT_SYMBOL_GPL(threads_shift);
 388 EXPORT_SYMBOL_GPL(threads_core_mask);
 389
 390 static void __init cpu_init_thread_core_maps(int tpc)
 391 {
 392         int i;
 393
 394         threads_per_core = tpc;
 395         cpumask_clear(&threads_core_mask);
 396
 397         /* This implementation only supports power of 2 number of threads
 398          * for simplicity and performance
 399          */
 400         threads_shift = ilog2(tpc);
 401         BUG_ON(tpc != (1 << threads_shift));
 402
 403         for (i = 0; i < tpc; i++)
 404                 cpumask_set_cpu(i, &threads_core_mask);
 405
 406         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 407                tpc, tpc > 1 ? "s" : "");
 408         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 409 }
 410
 411
 412 /**
 413  * setup_cpu_maps - initialize the following cpu maps:
 414  *                  cpu_possible_mask
 415  *                  cpu_present_mask
 416  *
 417  * Having the possible map set up early allows us to restrict allocations
 418  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 419  *
 420  * We do not initialize the online map here; cpus set their own bits in
 421  * cpu_online_mask as they come up.
 422  *
 423  * This function is valid only for Open Firmware systems.  finish_device_tree
 424  * must be called before using this.
 425  *
 426  * While we're here, we may as well set the "physical" cpu ids in the paca.
 427  *
 428  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 429  */
 430 void __init smp_setup_cpu_maps(void)
 431 {
 432         struct device_node *dn = NULL;
 433         int cpu = 0;
 434         int nthreads = 1;
 435
 436         DBG("smp_setup_cpu_maps()\n");
 437
 438         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 439                 const __be32 *intserv;
 440                 __be32 cpu_be;
 441                 int j, len;
 442
 443                 DBG("  * %s...\n", dn->full_name);
 444
 445                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 446                                 &len);
 447                 if (intserv) {
 448                         nthreads = len / sizeof(int);
 449                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 450                             nthreads);
 451                 } else {
 452                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 453                         intserv = of_get_property(dn, "reg", NULL);
 454                         if (!intserv) {
 455                                 cpu_be = cpu_to_be32(cpu);
 456                                 intserv = &cpu_be;      /* assume logical == phys */
 457                         }
 458                 }
 459
 460                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 461                         bool avail;
 462
 463                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 464                             j, cpu, be32_to_cpu(intserv[j]));
 465
 466                         avail = of_device_is_available(dn);
 467                         if (!avail)
 468                                 avail = !of_property_match_string(dn,
 469                                                 "enable-method", "spin-table");
 470
 471                         set_cpu_present(cpu, avail);
 472                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 473                         set_cpu_possible(cpu, true);
 474                         cpu++;
 475                 }
 476         }
 477
 478         /* If no SMT supported, nthreads is forced to 1 */
 479         if (!cpu_has_feature(CPU_FTR_SMT)) {
 480                 DBG("  SMT disabled ! nthreads forced to 1\n");
 481                 nthreads = 1;
 482         }
 483
 484 #ifdef CONFIG_PPC64
 485         /*
 486          * On pSeries LPAR, we need to know how many cpus
 487          * could possibly be added to this partition.
 488          */
 489         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 490             (dn = of_find_node_by_path("/rtas"))) {
 491                 int num_addr_cell, num_size_cell, maxcpus;
 492                 const unsigned int *ireg;
 493
 494                 num_addr_cell = of_n_addr_cells(dn);
 495                 num_size_cell = of_n_size_cells(dn);
 496
 497                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 498
 499                 if (!ireg)
 500                         goto out;
 501
 502                 maxcpus = ireg[num_addr_cell + num_size_cell];
 503
 504                 /* Double maxcpus for processors which have SMT capability */
 505                 if (cpu_has_feature(CPU_FTR_SMT))
 506                         maxcpus *= nthreads;
 507
 508                 if (maxcpus > nr_cpu_ids) {
 509                         printk(KERN_WARNING
 510                                "Partition configured for %d cpus, "
 511                                "operating system maximum is %d.\n",
 512                                maxcpus, nr_cpu_ids);
 513                         maxcpus = nr_cpu_ids;
 514                 } else
 515                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 516                                maxcpus);
 517
 518                 for (cpu = 0; cpu < maxcpus; cpu++)
 519                         set_cpu_possible(cpu, true);
 520         out:
 521                 of_node_put(dn);
 522         }
 523         vdso_data->processorCount = num_present_cpus();
 524 #endif /* CONFIG_PPC64 */
 525
 526         /* Initialize CPU <=> thread mapping/
 527          *
 528          * WARNING: We assume that the number of threads is the same for
 529          * every CPU in the system. If that is not the case, then some code
 530          * here will have to be reworked
 531          */
 532         cpu_init_thread_core_maps(nthreads);
 533
 534         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 535         setup_nr_cpu_ids();
 536
 537         free_unused_pacas();
 538 }
 539 #endif /* CONFIG_SMP */
 540
 541 #ifdef CONFIG_PCSPKR_PLATFORM
 542 static __init int add_pcspkr(void)
 543 {
 544         struct device_node *np;
 545         struct platform_device *pd;
 546         int ret;
 547
 548         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 549         of_node_put(np);
 550         if (!np)
 551                 return -ENODEV;
 552
 553         pd = platform_device_alloc("pcspkr", -1);
 554         if (!pd)
 555                 return -ENOMEM;
 556
 557         ret = platform_device_add(pd);
 558         if (ret)
 559                 platform_device_put(pd);
 560
 561         return ret;
 562 }
 563 device_initcall(add_pcspkr);
 564 #endif  /* CONFIG_PCSPKR_PLATFORM */
 565
 566 void probe_machine(void)
 567 {
 568         extern struct machdep_calls __machine_desc_start;
 569         extern struct machdep_calls __machine_desc_end;
 570
 571         /*
 572          * Iterate all ppc_md structures until we find the proper
 573          * one for the current machine type
 574          */
 575         DBG("Probing machine type ...\n");
 576
 577         for (machine_id = &__machine_desc_start;
 578              machine_id < &__machine_desc_end;
 579              machine_id++) {
 580                 DBG("  %s ...", machine_id->name);
 581                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 582                 if (ppc_md.probe()) {
 583                         DBG(" match !\n");
 584                         break;
 585                 }
 586                 DBG("\n");
 587         }
 588         /* What can we do if we didn't find ? */
 589         if (machine_id >= &__machine_desc_end) {
 590                 DBG("No suitable machine found !\n");
 591                 for (;;);
 592         }
 593
 594         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 595 }
 596
 597 /* Match a class of boards, not a specific device configuration. */
 598 int check_legacy_ioport(unsigned long base_port)
 599 {
 600         struct device_node *parent, *np = NULL;
 601         int ret = -ENODEV;
 602
 603         switch(base_port) {
 604         case I8042_DATA_REG:
 605                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 606                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 607                 if (np) {
 608                         parent = of_get_parent(np);
 609
 610                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 611                         if (!of_i8042_kbd_irq)
 612                                 of_i8042_kbd_irq = 1;
 613
 614                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 615                         if (!of_i8042_aux_irq)
 616                                 of_i8042_aux_irq = 12;
 617
 618                         of_node_put(np);
 619                         np = parent;
 620                         break;
 621                 }
 622                 np = of_find_node_by_type(NULL, "8042");
 623                 /* Pegasos has no device_type on its 8042 node, look for the
 624                  * name instead */
 625                 if (!np)
 626                         np = of_find_node_by_name(NULL, "8042");
 627                 if (np) {
 628                         of_i8042_kbd_irq = 1;
 629                         of_i8042_aux_irq = 12;
 630                 }
 631                 break;
 632         case FDC_BASE: /* FDC1 */
 633                 np = of_find_node_by_type(NULL, "fdc");
 634                 break;
 635         default:
 636                 /* ipmi is supposed to fail here */
 637                 break;
 638         }
 639         if (!np)
 640                 return ret;
 641         parent = of_get_parent(np);
 642         if (parent) {
 643                 if (strcmp(parent->type, "isa") == 0)
 644                         ret = 0;
 645                 of_node_put(parent);
 646         }
 647         of_node_put(np);
 648         return ret;
 649 }
 650 EXPORT_SYMBOL(check_legacy_ioport);
 651
 652 static int ppc_panic_event(struct notifier_block *this,
 653                              unsigned long event, void *ptr)
 654 {
 655         /*
 656          * If firmware-assisted dump has been registered then trigger
 657          * firmware-assisted dump and let firmware handle everything else.
 658          */
 659         crash_fadump(NULL, ptr);
 660         ppc_md.panic(ptr);  /* May not return */
 661         return NOTIFY_DONE;
 662 }
 663
 664 static struct notifier_block ppc_panic_block = {
 665         .notifier_call = ppc_panic_event,
 666         .priority = INT_MIN /* may not return; must be done last */
 667 };
 668
 669 void __init setup_panic(void)
 670 {
 671         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 672 }
 673
 674 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 675 /*
 676  * For platforms that have configurable cache-coherency.  This function
 677  * checks that the cache coherency setting of the kernel matches the setting
 678  * left by the firmware, as indicated in the device tree.  Since a mismatch
 679  * will eventually result in DMA failures, we print * and error and call
 680  * BUG() in that case.
 681  */
 682
 683 #ifdef CONFIG_NOT_COHERENT_CACHE
 684 #define KERNEL_COHERENCY        0
 685 #else
 686 #define KERNEL_COHERENCY        1
 687 #endif
 688
 689 static int __init check_cache_coherency(void)
 690 {
 691         struct device_node *np;
 692         const void *prop;
 693         int devtree_coherency;
 694
 695         np = of_find_node_by_path("/");
 696         prop = of_get_property(np, "coherency-off", NULL);
 697         of_node_put(np);
 698
 699         devtree_coherency = prop ? 0 : 1;
 700
 701         if (devtree_coherency != KERNEL_COHERENCY) {
 702                 printk(KERN_ERR
 703                         "kernel coherency:%s != device tree_coherency:%s\n",
 704                         KERNEL_COHERENCY ? "on" : "off",
 705                         devtree_coherency ? "on" : "off");
 706                 BUG();
 707         }
 708
 709         return 0;
 710 }
 711
 712 late_initcall(check_cache_coherency);
 713 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 714
 715 #ifdef CONFIG_DEBUG_FS
 716 struct dentry *powerpc_debugfs_root;
 717 EXPORT_SYMBOL(powerpc_debugfs_root);
 718
 719 static int powerpc_debugfs_init(void)
 720 {
 721         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 722
 723         return powerpc_debugfs_root == NULL;
 724 }
 725 arch_initcall(powerpc_debugfs_init);
 726 #endif
 727
 728 #ifdef CONFIG_BOOKE_WDT
 729 extern u32 booke_wdt_enabled;
 730 extern u32 booke_wdt_period;
 731
 732 /* Checks wdt=x and wdt_period=xx command-line option */
 733 notrace int __init early_parse_wdt(char *p)
 734 {
 735         if (p && strncmp(p, "0", 1) != 0)
 736                 booke_wdt_enabled = 1;
 737
 738         return 0;
 739 }
 740 early_param("wdt", early_parse_wdt);
 741
 742 int __init early_parse_wdt_period(char *p)
 743 {
 744         unsigned long ret;
 745         if (p) {
 746                 if (!kstrtol(p, 0, &ret))
 747                         booke_wdt_period = ret;
 748         }
 749
 750         return 0;
 751 }
 752 early_param("wdt_period", early_parse_wdt_period);
 753 #endif  /* CONFIG_BOOKE_WDT */
 754
 755 void ppc_printk_progress(char *s, unsigned short hex)
 756 {
 757         pr_info("%s\n", s);
 758 }
 759
 760 void arch_setup_pdev_archdata(struct platform_device *pdev)
 761 {
 762         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 763         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 764         set_dma_ops(&pdev->dev, &dma_direct_ops);
 765 }