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 /*
  85  * This still seems to be needed... -- paulus
  86  */
  87 struct screen_info screen_info = {
  88         .orig_x = 0,
  89         .orig_y = 25,
  90         .orig_video_cols = 80,
  91         .orig_video_lines = 25,
  92         .orig_video_isVGA = 1,
  93         .orig_video_points = 16
  94 };
  95 #if defined(CONFIG_FB_VGA16_MODULE)
  96 EXPORT_SYMBOL(screen_info);
  97 #endif
  98
  99 /* Variables required to store legacy IO irq routing */
 100 int of_i8042_kbd_irq;
 101 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 102 int of_i8042_aux_irq;
 103 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 104
 105 #ifdef __DO_IRQ_CANON
 106 /* XXX should go elsewhere eventually */
 107 int ppc_do_canonicalize_irqs;
 108 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 109 #endif
 110
 111 /* also used by kexec */
 112 void machine_shutdown(void)
 113 {
 114 #ifdef CONFIG_FA_DUMP
 115         /*
 116          * if fadump is active, cleanup the fadump registration before we
 117          * shutdown.
 118          */
 119         fadump_cleanup();
 120 #endif
 121
 122         if (ppc_md.machine_shutdown)
 123                 ppc_md.machine_shutdown();
 124 }
 125
 126 void machine_restart(char *cmd)
 127 {
 128         machine_shutdown();
 129         if (ppc_md.restart)
 130                 ppc_md.restart(cmd);
 131 #ifdef CONFIG_SMP
 132         smp_send_stop();
 133 #endif
 134         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 135         local_irq_disable();
 136         while (1) ;
 137 }
 138
 139 void machine_power_off(void)
 140 {
 141         machine_shutdown();
 142         if (pm_power_off)
 143                 pm_power_off();
 144 #ifdef CONFIG_SMP
 145         smp_send_stop();
 146 #endif
 147         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 148         local_irq_disable();
 149         while (1) ;
 150 }
 151 /* Used by the G5 thermal driver */
 152 EXPORT_SYMBOL_GPL(machine_power_off);
 153
 154 void (*pm_power_off)(void);
 155 EXPORT_SYMBOL_GPL(pm_power_off);
 156
 157 void machine_halt(void)
 158 {
 159         machine_shutdown();
 160         if (ppc_md.halt)
 161                 ppc_md.halt();
 162 #ifdef CONFIG_SMP
 163         smp_send_stop();
 164 #endif
 165         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 166         local_irq_disable();
 167         while (1) ;
 168 }
 169
 170
 171 #ifdef CONFIG_TAU
 172 extern u32 cpu_temp(unsigned long cpu);
 173 extern u32 cpu_temp_both(unsigned long cpu);
 174 #endif /* CONFIG_TAU */
 175
 176 #ifdef CONFIG_SMP
 177 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 178 #endif
 179
 180 static void show_cpuinfo_summary(struct seq_file *m)
 181 {
 182         struct device_node *root;
 183         const char *model = NULL;
 184 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 185         unsigned long bogosum = 0;
 186         int i;
 187         for_each_online_cpu(i)
 188                 bogosum += loops_per_jiffy;
 189         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 190                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 191 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 192         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 193         if (ppc_md.name)
 194                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 195         root = of_find_node_by_path("/");
 196         if (root)
 197                 model = of_get_property(root, "model", NULL);
 198         if (model)
 199                 seq_printf(m, "model\t\t: %s\n", model);
 200         of_node_put(root);
 201
 202         if (ppc_md.show_cpuinfo != NULL)
 203                 ppc_md.show_cpuinfo(m);
 204
 205 #ifdef CONFIG_PPC32
 206         /* Display the amount of memory */
 207         seq_printf(m, "Memory\t\t: %d MB\n",
 208                    (unsigned int)(total_memory / (1024 * 1024)));
 209 #endif
 210 }
 211
 212 static int show_cpuinfo(struct seq_file *m, void *v)
 213 {
 214         unsigned long cpu_id = (unsigned long)v - 1;
 215         unsigned int pvr;
 216         unsigned long proc_freq;
 217         unsigned short maj;
 218         unsigned short min;
 219
 220         /* We only show online cpus: disable preempt (overzealous, I
 221          * knew) to prevent cpu going down. */
 222         preempt_disable();
 223         if (!cpu_online(cpu_id)) {
 224                 preempt_enable();
 225                 return 0;
 226         }
 227
 228 #ifdef CONFIG_SMP
 229         pvr = per_cpu(cpu_pvr, cpu_id);
 230 #else
 231         pvr = mfspr(SPRN_PVR);
 232 #endif
 233         maj = (pvr >> 8) & 0xFF;
 234         min = pvr & 0xFF;
 235
 236         seq_printf(m, "processor\t: %lu\n", cpu_id);
 237         seq_printf(m, "cpu\t\t: ");
 238
 239         if (cur_cpu_spec->pvr_mask)
 240                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 241         else
 242                 seq_printf(m, "unknown (%08x)", pvr);
 243
 244 #ifdef CONFIG_ALTIVEC
 245         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 246                 seq_printf(m, ", altivec supported");
 247 #endif /* CONFIG_ALTIVEC */
 248
 249         seq_printf(m, "\n");
 250
 251 #ifdef CONFIG_TAU
 252         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 253 #ifdef CONFIG_TAU_AVERAGE
 254                 /* more straightforward, but potentially misleading */
 255                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 256                            cpu_temp(cpu_id));
 257 #else
 258                 /* show the actual temp sensor range */
 259                 u32 temp;
 260                 temp = cpu_temp_both(cpu_id);
 261                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 262                            temp & 0xff, temp >> 16);
 263 #endif
 264         }
 265 #endif /* CONFIG_TAU */
 266
 267         /*
 268          * Platforms that have variable clock rates, should implement
 269          * the method ppc_md.get_proc_freq() that reports the clock
 270          * rate of a given cpu. The rest can use ppc_proc_freq to
 271          * report the clock rate that is same across all cpus.
 272          */
 273         if (ppc_md.get_proc_freq)
 274                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 275         else
 276                 proc_freq = ppc_proc_freq;
 277
 278         if (proc_freq)
 279                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 280                            proc_freq / 1000000, proc_freq % 1000000);
 281
 282         if (ppc_md.show_percpuinfo != NULL)
 283                 ppc_md.show_percpuinfo(m, cpu_id);
 284
 285         /* If we are a Freescale core do a simple check so
 286          * we dont have to keep adding cases in the future */
 287         if (PVR_VER(pvr) & 0x8000) {
 288                 switch (PVR_VER(pvr)) {
 289                 case 0x8000:    /* 7441/7450/7451, Voyager */
 290                 case 0x8001:    /* 7445/7455, Apollo 6 */
 291                 case 0x8002:    /* 7447/7457, Apollo 7 */
 292                 case 0x8003:    /* 7447A, Apollo 7 PM */
 293                 case 0x8004:    /* 7448, Apollo 8 */
 294                 case 0x800c:    /* 7410, Nitro */
 295                         maj = ((pvr >> 8) & 0xF);
 296                         min = PVR_MIN(pvr);
 297                         break;
 298                 default:        /* e500/book-e */
 299                         maj = PVR_MAJ(pvr);
 300                         min = PVR_MIN(pvr);
 301                         break;
 302                 }
 303         } else {
 304                 switch (PVR_VER(pvr)) {
 305                         case 0x0020:    /* 403 family */
 306                                 maj = PVR_MAJ(pvr) + 1;
 307                                 min = PVR_MIN(pvr);
 308                                 break;
 309                         case 0x1008:    /* 740P/750P ?? */
 310                                 maj = ((pvr >> 8) & 0xFF) - 1;
 311                                 min = pvr & 0xFF;
 312                                 break;
 313                         default:
 314                                 maj = (pvr >> 8) & 0xFF;
 315                                 min = pvr & 0xFF;
 316                                 break;
 317                 }
 318         }
 319
 320         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 321                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 322
 323 #ifdef CONFIG_PPC32
 324         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 325                    loops_per_jiffy / (500000/HZ),
 326                    (loops_per_jiffy / (5000/HZ)) % 100);
 327 #endif
 328
 329 #ifdef CONFIG_SMP
 330         seq_printf(m, "\n");
 331 #endif
 332
 333         preempt_enable();
 334
 335         /* If this is the last cpu, print the summary */
 336         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 337                 show_cpuinfo_summary(m);
 338
 339         return 0;
 340 }
 341
 342 static void *c_start(struct seq_file *m, loff_t *pos)
 343 {
 344         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 345                 *pos = cpumask_first(cpu_online_mask);
 346         else
 347                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 348         if ((*pos) < nr_cpu_ids)
 349                 return (void *)(unsigned long)(*pos + 1);
 350         return NULL;
 351 }
 352
 353 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 354 {
 355         (*pos)++;
 356         return c_start(m, pos);
 357 }
 358
 359 static void c_stop(struct seq_file *m, void *v)
 360 {
 361 }
 362
 363 const struct seq_operations cpuinfo_op = {
 364         .start =c_start,
 365         .next = c_next,
 366         .stop = c_stop,
 367         .show = show_cpuinfo,
 368 };
 369
 370 void __init check_for_initrd(void)
 371 {
 372 #ifdef CONFIG_BLK_DEV_INITRD
 373         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 374             initrd_start, initrd_end);
 375
 376         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 377          * look sensible. If not, clear initrd reference.
 378          */
 379         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 380             initrd_end > initrd_start)
 381                 ROOT_DEV = Root_RAM0;
 382         else
 383                 initrd_start = initrd_end = 0;
 384
 385         if (initrd_start)
 386                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 387
 388         DBG(" <- check_for_initrd()\n");
 389 #endif /* CONFIG_BLK_DEV_INITRD */
 390 }
 391
 392 #ifdef CONFIG_SMP
 393
 394 int threads_per_core, threads_per_subcore, threads_shift;
 395 cpumask_t threads_core_mask;
 396 EXPORT_SYMBOL_GPL(threads_per_core);
 397 EXPORT_SYMBOL_GPL(threads_per_subcore);
 398 EXPORT_SYMBOL_GPL(threads_shift);
 399 EXPORT_SYMBOL_GPL(threads_core_mask);
 400
 401 static void __init cpu_init_thread_core_maps(int tpc)
 402 {
 403         int i;
 404
 405         threads_per_core = tpc;
 406         threads_per_subcore = tpc;
 407         cpumask_clear(&threads_core_mask);
 408
 409         /* This implementation only supports power of 2 number of threads
 410          * for simplicity and performance
 411          */
 412         threads_shift = ilog2(tpc);
 413         BUG_ON(tpc != (1 << threads_shift));
 414
 415         for (i = 0; i < tpc; i++)
 416                 cpumask_set_cpu(i, &threads_core_mask);
 417
 418         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 419                tpc, tpc > 1 ? "s" : "");
 420         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 421 }
 422
 423
 424 /**
 425  * setup_cpu_maps - initialize the following cpu maps:
 426  *                  cpu_possible_mask
 427  *                  cpu_present_mask
 428  *
 429  * Having the possible map set up early allows us to restrict allocations
 430  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 431  *
 432  * We do not initialize the online map here; cpus set their own bits in
 433  * cpu_online_mask as they come up.
 434  *
 435  * This function is valid only for Open Firmware systems.  finish_device_tree
 436  * must be called before using this.
 437  *
 438  * While we're here, we may as well set the "physical" cpu ids in the paca.
 439  *
 440  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 441  */
 442 void __init smp_setup_cpu_maps(void)
 443 {
 444         struct device_node *dn = NULL;
 445         int cpu = 0;
 446         int nthreads = 1;
 447
 448         DBG("smp_setup_cpu_maps()\n");
 449
 450         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 451                 const __be32 *intserv;
 452                 __be32 cpu_be;
 453                 int j, len;
 454
 455                 DBG("  * %s...\n", dn->full_name);
 456
 457                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 458                                 &len);
 459                 if (intserv) {
 460                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 461                             nthreads);
 462                 } else {
 463                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 464                         intserv = of_get_property(dn, "reg", &len);
 465                         if (!intserv) {
 466                                 cpu_be = cpu_to_be32(cpu);
 467                                 intserv = &cpu_be;      /* assume logical == phys */
 468                                 len = 4;
 469                         }
 470                 }
 471
 472                 nthreads = len / sizeof(int);
 473
 474                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 475                         bool avail;
 476
 477                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 478                             j, cpu, be32_to_cpu(intserv[j]));
 479
 480                         avail = of_device_is_available(dn);
 481                         if (!avail)
 482                                 avail = !of_property_match_string(dn,
 483                                                 "enable-method", "spin-table");
 484
 485                         set_cpu_present(cpu, avail);
 486                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 487                         set_cpu_possible(cpu, true);
 488                         cpu++;
 489                 }
 490         }
 491
 492         /* If no SMT supported, nthreads is forced to 1 */
 493         if (!cpu_has_feature(CPU_FTR_SMT)) {
 494                 DBG("  SMT disabled ! nthreads forced to 1\n");
 495                 nthreads = 1;
 496         }
 497
 498 #ifdef CONFIG_PPC64
 499         /*
 500          * On pSeries LPAR, we need to know how many cpus
 501          * could possibly be added to this partition.
 502          */
 503         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 504             (dn = of_find_node_by_path("/rtas"))) {
 505                 int num_addr_cell, num_size_cell, maxcpus;
 506                 const __be32 *ireg;
 507
 508                 num_addr_cell = of_n_addr_cells(dn);
 509                 num_size_cell = of_n_size_cells(dn);
 510
 511                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 512
 513                 if (!ireg)
 514                         goto out;
 515
 516                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 517
 518                 /* Double maxcpus for processors which have SMT capability */
 519                 if (cpu_has_feature(CPU_FTR_SMT))
 520                         maxcpus *= nthreads;
 521
 522                 if (maxcpus > nr_cpu_ids) {
 523                         printk(KERN_WARNING
 524                                "Partition configured for %d cpus, "
 525                                "operating system maximum is %d.\n",
 526                                maxcpus, nr_cpu_ids);
 527                         maxcpus = nr_cpu_ids;
 528                 } else
 529                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 530                                maxcpus);
 531
 532                 for (cpu = 0; cpu < maxcpus; cpu++)
 533                         set_cpu_possible(cpu, true);
 534         out:
 535                 of_node_put(dn);
 536         }
 537         vdso_data->processorCount = num_present_cpus();
 538 #endif /* CONFIG_PPC64 */
 539
 540         /* Initialize CPU <=> thread mapping/
 541          *
 542          * WARNING: We assume that the number of threads is the same for
 543          * every CPU in the system. If that is not the case, then some code
 544          * here will have to be reworked
 545          */
 546         cpu_init_thread_core_maps(nthreads);
 547
 548         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 549         setup_nr_cpu_ids();
 550
 551         free_unused_pacas();
 552 }
 553 #endif /* CONFIG_SMP */
 554
 555 #ifdef CONFIG_PCSPKR_PLATFORM
 556 static __init int add_pcspkr(void)
 557 {
 558         struct device_node *np;
 559         struct platform_device *pd;
 560         int ret;
 561
 562         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 563         of_node_put(np);
 564         if (!np)
 565                 return -ENODEV;
 566
 567         pd = platform_device_alloc("pcspkr", -1);
 568         if (!pd)
 569                 return -ENOMEM;
 570
 571         ret = platform_device_add(pd);
 572         if (ret)
 573                 platform_device_put(pd);
 574
 575         return ret;
 576 }
 577 device_initcall(add_pcspkr);
 578 #endif  /* CONFIG_PCSPKR_PLATFORM */
 579
 580 void probe_machine(void)
 581 {
 582         extern struct machdep_calls __machine_desc_start;
 583         extern struct machdep_calls __machine_desc_end;
 584
 585         /*
 586          * Iterate all ppc_md structures until we find the proper
 587          * one for the current machine type
 588          */
 589         DBG("Probing machine type ...\n");
 590
 591         for (machine_id = &__machine_desc_start;
 592              machine_id < &__machine_desc_end;
 593              machine_id++) {
 594                 DBG("  %s ...", machine_id->name);
 595                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 596                 if (ppc_md.probe()) {
 597                         DBG(" match !\n");
 598                         break;
 599                 }
 600                 DBG("\n");
 601         }
 602         /* What can we do if we didn't find ? */
 603         if (machine_id >= &__machine_desc_end) {
 604                 DBG("No suitable machine found !\n");
 605                 for (;;);
 606         }
 607
 608         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 609 }
 610
 611 /* Match a class of boards, not a specific device configuration. */
 612 int check_legacy_ioport(unsigned long base_port)
 613 {
 614         struct device_node *parent, *np = NULL;
 615         int ret = -ENODEV;
 616
 617         switch(base_port) {
 618         case I8042_DATA_REG:
 619                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 620                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 621                 if (np) {
 622                         parent = of_get_parent(np);
 623
 624                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 625                         if (!of_i8042_kbd_irq)
 626                                 of_i8042_kbd_irq = 1;
 627
 628                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 629                         if (!of_i8042_aux_irq)
 630                                 of_i8042_aux_irq = 12;
 631
 632                         of_node_put(np);
 633                         np = parent;
 634                         break;
 635                 }
 636                 np = of_find_node_by_type(NULL, "8042");
 637                 /* Pegasos has no device_type on its 8042 node, look for the
 638                  * name instead */
 639                 if (!np)
 640                         np = of_find_node_by_name(NULL, "8042");
 641                 if (np) {
 642                         of_i8042_kbd_irq = 1;
 643                         of_i8042_aux_irq = 12;
 644                 }
 645                 break;
 646         case FDC_BASE: /* FDC1 */
 647                 np = of_find_node_by_type(NULL, "fdc");
 648                 break;
 649         default:
 650                 /* ipmi is supposed to fail here */
 651                 break;
 652         }
 653         if (!np)
 654                 return ret;
 655         parent = of_get_parent(np);
 656         if (parent) {
 657                 if (strcmp(parent->type, "isa") == 0)
 658                         ret = 0;
 659                 of_node_put(parent);
 660         }
 661         of_node_put(np);
 662         return ret;
 663 }
 664 EXPORT_SYMBOL(check_legacy_ioport);
 665
 666 static int ppc_panic_event(struct notifier_block *this,
 667                              unsigned long event, void *ptr)
 668 {
 669         /*
 670          * If firmware-assisted dump has been registered then trigger
 671          * firmware-assisted dump and let firmware handle everything else.
 672          */
 673         crash_fadump(NULL, ptr);
 674         ppc_md.panic(ptr);  /* May not return */
 675         return NOTIFY_DONE;
 676 }
 677
 678 static struct notifier_block ppc_panic_block = {
 679         .notifier_call = ppc_panic_event,
 680         .priority = INT_MIN /* may not return; must be done last */
 681 };
 682
 683 void __init setup_panic(void)
 684 {
 685         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 686 }
 687
 688 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 689 /*
 690  * For platforms that have configurable cache-coherency.  This function
 691  * checks that the cache coherency setting of the kernel matches the setting
 692  * left by the firmware, as indicated in the device tree.  Since a mismatch
 693  * will eventually result in DMA failures, we print * and error and call
 694  * BUG() in that case.
 695  */
 696
 697 #ifdef CONFIG_NOT_COHERENT_CACHE
 698 #define KERNEL_COHERENCY        0
 699 #else
 700 #define KERNEL_COHERENCY        1
 701 #endif
 702
 703 static int __init check_cache_coherency(void)
 704 {
 705         struct device_node *np;
 706         const void *prop;
 707         int devtree_coherency;
 708
 709         np = of_find_node_by_path("/");
 710         prop = of_get_property(np, "coherency-off", NULL);
 711         of_node_put(np);
 712
 713         devtree_coherency = prop ? 0 : 1;
 714
 715         if (devtree_coherency != KERNEL_COHERENCY) {
 716                 printk(KERN_ERR
 717                         "kernel coherency:%s != device tree_coherency:%s\n",
 718                         KERNEL_COHERENCY ? "on" : "off",
 719                         devtree_coherency ? "on" : "off");
 720                 BUG();
 721         }
 722
 723         return 0;
 724 }
 725
 726 late_initcall(check_cache_coherency);
 727 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 728
 729 #ifdef CONFIG_DEBUG_FS
 730 struct dentry *powerpc_debugfs_root;
 731 EXPORT_SYMBOL(powerpc_debugfs_root);
 732
 733 static int powerpc_debugfs_init(void)
 734 {
 735         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 736
 737         return powerpc_debugfs_root == NULL;
 738 }
 739 arch_initcall(powerpc_debugfs_init);
 740 #endif
 741
 742 void ppc_printk_progress(char *s, unsigned short hex)
 743 {
 744         pr_info("%s\n", s);
 745 }
 746
 747 void arch_setup_pdev_archdata(struct platform_device *pdev)
 748 {
 749         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 750         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 751         set_dma_ops(&pdev->dev, &dma_direct_ops);
 752 }