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/module.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/utsname.h>
  28 #include <linux/screen_info.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/notifier.h>
  31 #include <linux/cpu.h>
  32 #include <linux/unistd.h>
  33 #include <linux/serial.h>
  34 #include <linux/serial_8250.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/percpu.h>
  37 #include <linux/lmb.h>
  38 #include <linux/of_platform.h>
  39 #include <linux/platform_device.h>
  40 #include <asm/io.h>
  41 #include <asm/prom.h>
  42 #include <asm/processor.h>
  43 #include <asm/vdso_datapage.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/smp.h>
  46 #include <asm/elf.h>
  47 #include <asm/machdep.h>
  48 #include <asm/time.h>
  49 #include <asm/cputable.h>
  50 #include <asm/sections.h>
  51 #include <asm/firmware.h>
  52 #include <asm/btext.h>
  53 #include <asm/nvram.h>
  54 #include <asm/setup.h>
  55 #include <asm/system.h>
  56 #include <asm/rtas.h>
  57 #include <asm/iommu.h>
  58 #include <asm/serial.h>
  59 #include <asm/cache.h>
  60 #include <asm/page.h>
  61 #include <asm/mmu.h>
  62 #include <asm/xmon.h>
  63 #include <asm/cputhreads.h>
  64 #include <mm/mmu_decl.h>
  65
  66 #include "setup.h"
  67
  68 #ifdef DEBUG
  69 #include <asm/udbg.h>
  70 #define DBG(fmt...) udbg_printf(fmt)
  71 #else
  72 #define DBG(fmt...)
  73 #endif
  74
  75 /* The main machine-dep calls structure
  76  */
  77 struct machdep_calls ppc_md;
  78 EXPORT_SYMBOL(ppc_md);
  79 struct machdep_calls *machine_id;
  80 EXPORT_SYMBOL(machine_id);
  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 #ifdef __DO_IRQ_CANON
  99 /* XXX should go elsewhere eventually */
 100 int ppc_do_canonicalize_irqs;
 101 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 102 #endif
 103
 104 /* also used by kexec */
 105 void machine_shutdown(void)
 106 {
 107         if (ppc_md.machine_shutdown)
 108                 ppc_md.machine_shutdown();
 109 }
 110
 111 void machine_restart(char *cmd)
 112 {
 113         machine_shutdown();
 114         if (ppc_md.restart)
 115                 ppc_md.restart(cmd);
 116 #ifdef CONFIG_SMP
 117         smp_send_stop();
 118 #endif
 119         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 120         local_irq_disable();
 121         while (1) ;
 122 }
 123
 124 void machine_power_off(void)
 125 {
 126         machine_shutdown();
 127         if (ppc_md.power_off)
 128                 ppc_md.power_off();
 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 /* Used by the G5 thermal driver */
 137 EXPORT_SYMBOL_GPL(machine_power_off);
 138
 139 void (*pm_power_off)(void) = machine_power_off;
 140 EXPORT_SYMBOL_GPL(pm_power_off);
 141
 142 void machine_halt(void)
 143 {
 144         machine_shutdown();
 145         if (ppc_md.halt)
 146                 ppc_md.halt();
 147 #ifdef CONFIG_SMP
 148         smp_send_stop();
 149 #endif
 150         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 151         local_irq_disable();
 152         while (1) ;
 153 }
 154
 155
 156 #ifdef CONFIG_TAU
 157 extern u32 cpu_temp(unsigned long cpu);
 158 extern u32 cpu_temp_both(unsigned long cpu);
 159 #endif /* CONFIG_TAU */
 160
 161 #ifdef CONFIG_SMP
 162 DEFINE_PER_CPU(unsigned int, pvr);
 163 #endif
 164
 165 static int show_cpuinfo(struct seq_file *m, void *v)
 166 {
 167         unsigned long cpu_id = (unsigned long)v - 1;
 168         unsigned int pvr;
 169         unsigned short maj;
 170         unsigned short min;
 171
 172         if (cpu_id == NR_CPUS) {
 173                 struct device_node *root;
 174                 const char *model = NULL;
 175 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 176                 unsigned long bogosum = 0;
 177                 int i;
 178                 for_each_online_cpu(i)
 179                         bogosum += loops_per_jiffy;
 180                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 181                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 182 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 183                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 184                 if (ppc_md.name)
 185                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 186                 root = of_find_node_by_path("/");
 187                 if (root)
 188                         model = of_get_property(root, "model", NULL);
 189                 if (model)
 190                         seq_printf(m, "model\t\t: %s\n", model);
 191                 of_node_put(root);
 192
 193                 if (ppc_md.show_cpuinfo != NULL)
 194                         ppc_md.show_cpuinfo(m);
 195
 196 #ifdef CONFIG_PPC32
 197                 /* Display the amount of memory */
 198                 seq_printf(m, "Memory\t\t: %d MB\n",
 199                            (unsigned int)(total_memory / (1024 * 1024)));
 200 #endif
 201
 202                 return 0;
 203         }
 204
 205         /* We only show online cpus: disable preempt (overzealous, I
 206          * knew) to prevent cpu going down. */
 207         preempt_disable();
 208         if (!cpu_online(cpu_id)) {
 209                 preempt_enable();
 210                 return 0;
 211         }
 212
 213 #ifdef CONFIG_SMP
 214         pvr = per_cpu(pvr, cpu_id);
 215 #else
 216         pvr = mfspr(SPRN_PVR);
 217 #endif
 218         maj = (pvr >> 8) & 0xFF;
 219         min = pvr & 0xFF;
 220
 221         seq_printf(m, "processor\t: %lu\n", cpu_id);
 222         seq_printf(m, "cpu\t\t: ");
 223
 224         if (cur_cpu_spec->pvr_mask)
 225                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 226         else
 227                 seq_printf(m, "unknown (%08x)", pvr);
 228
 229 #ifdef CONFIG_ALTIVEC
 230         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 231                 seq_printf(m, ", altivec supported");
 232 #endif /* CONFIG_ALTIVEC */
 233
 234         seq_printf(m, "\n");
 235
 236 #ifdef CONFIG_TAU
 237         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 238 #ifdef CONFIG_TAU_AVERAGE
 239                 /* more straightforward, but potentially misleading */
 240                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 241                            cpu_temp(cpu_id));
 242 #else
 243                 /* show the actual temp sensor range */
 244                 u32 temp;
 245                 temp = cpu_temp_both(cpu_id);
 246                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 247                            temp & 0xff, temp >> 16);
 248 #endif
 249         }
 250 #endif /* CONFIG_TAU */
 251
 252         /*
 253          * Assume here that all clock rates are the same in a
 254          * smp system.  -- Cort
 255          */
 256         if (ppc_proc_freq)
 257                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 258                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 259
 260         if (ppc_md.show_percpuinfo != NULL)
 261                 ppc_md.show_percpuinfo(m, cpu_id);
 262
 263         /* If we are a Freescale core do a simple check so
 264          * we dont have to keep adding cases in the future */
 265         if (PVR_VER(pvr) & 0x8000) {
 266                 switch (PVR_VER(pvr)) {
 267                 case 0x8000:    /* 7441/7450/7451, Voyager */
 268                 case 0x8001:    /* 7445/7455, Apollo 6 */
 269                 case 0x8002:    /* 7447/7457, Apollo 7 */
 270                 case 0x8003:    /* 7447A, Apollo 7 PM */
 271                 case 0x8004:    /* 7448, Apollo 8 */
 272                 case 0x800c:    /* 7410, Nitro */
 273                         maj = ((pvr >> 8) & 0xF);
 274                         min = PVR_MIN(pvr);
 275                         break;
 276                 default:        /* e500/book-e */
 277                         maj = PVR_MAJ(pvr);
 278                         min = PVR_MIN(pvr);
 279                         break;
 280                 }
 281         } else {
 282                 switch (PVR_VER(pvr)) {
 283                         case 0x0020:    /* 403 family */
 284                                 maj = PVR_MAJ(pvr) + 1;
 285                                 min = PVR_MIN(pvr);
 286                                 break;
 287                         case 0x1008:    /* 740P/750P ?? */
 288                                 maj = ((pvr >> 8) & 0xFF) - 1;
 289                                 min = pvr & 0xFF;
 290                                 break;
 291                         default:
 292                                 maj = (pvr >> 8) & 0xFF;
 293                                 min = pvr & 0xFF;
 294                                 break;
 295                 }
 296         }
 297
 298         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 299                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 300
 301 #ifdef CONFIG_PPC32
 302         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 303                    loops_per_jiffy / (500000/HZ),
 304                    (loops_per_jiffy / (5000/HZ)) % 100);
 305 #endif
 306
 307 #ifdef CONFIG_SMP
 308         seq_printf(m, "\n");
 309 #endif
 310
 311         preempt_enable();
 312         return 0;
 313 }
 314
 315 static void *c_start(struct seq_file *m, loff_t *pos)
 316 {
 317         unsigned long i = *pos;
 318
 319         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 320 }
 321
 322 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 323 {
 324         ++*pos;
 325         return c_start(m, pos);
 326 }
 327
 328 static void c_stop(struct seq_file *m, void *v)
 329 {
 330 }
 331
 332 struct seq_operations cpuinfo_op = {
 333         .start =c_start,
 334         .next = c_next,
 335         .stop = c_stop,
 336         .show = show_cpuinfo,
 337 };
 338
 339 void __init check_for_initrd(void)
 340 {
 341 #ifdef CONFIG_BLK_DEV_INITRD
 342         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 343             initrd_start, initrd_end);
 344
 345         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 346          * look sensible. If not, clear initrd reference.
 347          */
 348         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 349             initrd_end > initrd_start)
 350                 ROOT_DEV = Root_RAM0;
 351         else
 352                 initrd_start = initrd_end = 0;
 353
 354         if (initrd_start)
 355                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 356
 357         DBG(" <- check_for_initrd()\n");
 358 #endif /* CONFIG_BLK_DEV_INITRD */
 359 }
 360
 361 #ifdef CONFIG_SMP
 362
 363 int threads_per_core, threads_shift;
 364 cpumask_t threads_core_mask;
 365
 366 static void __init cpu_init_thread_core_maps(int tpc)
 367 {
 368         int i;
 369
 370         threads_per_core = tpc;
 371         threads_core_mask = CPU_MASK_NONE;
 372
 373         /* This implementation only supports power of 2 number of threads
 374          * for simplicity and performance
 375          */
 376         threads_shift = ilog2(tpc);
 377         BUG_ON(tpc != (1 << threads_shift));
 378
 379         for (i = 0; i < tpc; i++)
 380                 cpu_set(i, threads_core_mask);
 381
 382         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 383                tpc, tpc > 1 ? "s" : "");
 384         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 385 }
 386
 387
 388 /**
 389  * setup_cpu_maps - initialize the following cpu maps:
 390  *                  cpu_possible_map
 391  *                  cpu_present_map
 392  *
 393  * Having the possible map set up early allows us to restrict allocations
 394  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 395  *
 396  * We do not initialize the online map here; cpus set their own bits in
 397  * cpu_online_map as they come up.
 398  *
 399  * This function is valid only for Open Firmware systems.  finish_device_tree
 400  * must be called before using this.
 401  *
 402  * While we're here, we may as well set the "physical" cpu ids in the paca.
 403  *
 404  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 405  */
 406 void __init smp_setup_cpu_maps(void)
 407 {
 408         struct device_node *dn = NULL;
 409         int cpu = 0;
 410         int nthreads = 1;
 411
 412         DBG("smp_setup_cpu_maps()\n");
 413
 414         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 415                 const int *intserv;
 416                 int j, len;
 417
 418                 DBG("  * %s...\n", dn->full_name);
 419
 420                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 421                                 &len);
 422                 if (intserv) {
 423                         nthreads = len / sizeof(int);
 424                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 425                             nthreads);
 426                 } else {
 427                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 428                         intserv = of_get_property(dn, "reg", NULL);
 429                         if (!intserv)
 430                                 intserv = &cpu; /* assume logical == phys */
 431                 }
 432
 433                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 434                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 435                             j, cpu, intserv[j]);
 436                         cpu_set(cpu, cpu_present_map);
 437                         set_hard_smp_processor_id(cpu, intserv[j]);
 438                         cpu_set(cpu, cpu_possible_map);
 439                         cpu++;
 440                 }
 441         }
 442
 443         /* If no SMT supported, nthreads is forced to 1 */
 444         if (!cpu_has_feature(CPU_FTR_SMT)) {
 445                 DBG("  SMT disabled ! nthreads forced to 1\n");
 446                 nthreads = 1;
 447         }
 448
 449 #ifdef CONFIG_PPC64
 450         /*
 451          * On pSeries LPAR, we need to know how many cpus
 452          * could possibly be added to this partition.
 453          */
 454         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 455             (dn = of_find_node_by_path("/rtas"))) {
 456                 int num_addr_cell, num_size_cell, maxcpus;
 457                 const unsigned int *ireg;
 458
 459                 num_addr_cell = of_n_addr_cells(dn);
 460                 num_size_cell = of_n_size_cells(dn);
 461
 462                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 463
 464                 if (!ireg)
 465                         goto out;
 466
 467                 maxcpus = ireg[num_addr_cell + num_size_cell];
 468
 469                 /* Double maxcpus for processors which have SMT capability */
 470                 if (cpu_has_feature(CPU_FTR_SMT))
 471                         maxcpus *= nthreads;
 472
 473                 if (maxcpus > NR_CPUS) {
 474                         printk(KERN_WARNING
 475                                "Partition configured for %d cpus, "
 476                                "operating system maximum is %d.\n",
 477                                maxcpus, NR_CPUS);
 478                         maxcpus = NR_CPUS;
 479                 } else
 480                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 481                                maxcpus);
 482
 483                 for (cpu = 0; cpu < maxcpus; cpu++)
 484                         cpu_set(cpu, cpu_possible_map);
 485         out:
 486                 of_node_put(dn);
 487         }
 488         vdso_data->processorCount = num_present_cpus();
 489 #endif /* CONFIG_PPC64 */
 490
 491         /* Initialize CPU <=> thread mapping/
 492          *
 493          * WARNING: We assume that the number of threads is the same for
 494          * every CPU in the system. If that is not the case, then some code
 495          * here will have to be reworked
 496          */
 497         cpu_init_thread_core_maps(nthreads);
 498 }
 499 #endif /* CONFIG_SMP */
 500
 501 #ifdef CONFIG_PCSPKR_PLATFORM
 502 static __init int add_pcspkr(void)
 503 {
 504         struct device_node *np;
 505         struct platform_device *pd;
 506         int ret;
 507
 508         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 509         of_node_put(np);
 510         if (!np)
 511                 return -ENODEV;
 512
 513         pd = platform_device_alloc("pcspkr", -1);
 514         if (!pd)
 515                 return -ENOMEM;
 516
 517         ret = platform_device_add(pd);
 518         if (ret)
 519                 platform_device_put(pd);
 520
 521         return ret;
 522 }
 523 device_initcall(add_pcspkr);
 524 #endif  /* CONFIG_PCSPKR_PLATFORM */
 525
 526 void probe_machine(void)
 527 {
 528         extern struct machdep_calls __machine_desc_start;
 529         extern struct machdep_calls __machine_desc_end;
 530
 531         /*
 532          * Iterate all ppc_md structures until we find the proper
 533          * one for the current machine type
 534          */
 535         DBG("Probing machine type ...\n");
 536
 537         for (machine_id = &__machine_desc_start;
 538              machine_id < &__machine_desc_end;
 539              machine_id++) {
 540                 DBG("  %s ...", machine_id->name);
 541                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 542                 if (ppc_md.probe()) {
 543                         DBG(" match !\n");
 544                         break;
 545                 }
 546                 DBG("\n");
 547         }
 548         /* What can we do if we didn't find ? */
 549         if (machine_id >= &__machine_desc_end) {
 550                 DBG("No suitable machine found !\n");
 551                 for (;;);
 552         }
 553
 554         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 555 }
 556
 557 /* Match a class of boards, not a specific device configuration. */
 558 int check_legacy_ioport(unsigned long base_port)
 559 {
 560         struct device_node *parent, *np = NULL;
 561         int ret = -ENODEV;
 562
 563         switch(base_port) {
 564         case I8042_DATA_REG:
 565                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 566                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 567                 if (np) {
 568                         parent = of_get_parent(np);
 569                         of_node_put(np);
 570                         np = parent;
 571                         break;
 572                 }
 573                 np = of_find_node_by_type(NULL, "8042");
 574                 /* Pegasos has no device_type on its 8042 node, look for the
 575                  * name instead */
 576                 if (!np)
 577                         np = of_find_node_by_name(NULL, "8042");
 578                 break;
 579         case FDC_BASE: /* FDC1 */
 580                 np = of_find_node_by_type(NULL, "fdc");
 581                 break;
 582 #ifdef CONFIG_PPC_PREP
 583         case _PIDXR:
 584         case _PNPWRP:
 585         case PNPBIOS_BASE:
 586                 /* implement me */
 587 #endif
 588         default:
 589                 /* ipmi is supposed to fail here */
 590                 break;
 591         }
 592         if (!np)
 593                 return ret;
 594         parent = of_get_parent(np);
 595         if (parent) {
 596                 if (strcmp(parent->type, "isa") == 0)
 597                         ret = 0;
 598                 of_node_put(parent);
 599         }
 600         of_node_put(np);
 601         return ret;
 602 }
 603 EXPORT_SYMBOL(check_legacy_ioport);
 604
 605 static int ppc_panic_event(struct notifier_block *this,
 606                              unsigned long event, void *ptr)
 607 {
 608         ppc_md.panic(ptr);  /* May not return */
 609         return NOTIFY_DONE;
 610 }
 611
 612 static struct notifier_block ppc_panic_block = {
 613         .notifier_call = ppc_panic_event,
 614         .priority = INT_MIN /* may not return; must be done last */
 615 };
 616
 617 void __init setup_panic(void)
 618 {
 619         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 620 }
 621
 622 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 623 /*
 624  * For platforms that have configurable cache-coherency.  This function
 625  * checks that the cache coherency setting of the kernel matches the setting
 626  * left by the firmware, as indicated in the device tree.  Since a mismatch
 627  * will eventually result in DMA failures, we print * and error and call
 628  * BUG() in that case.
 629  */
 630
 631 #ifdef CONFIG_NOT_COHERENT_CACHE
 632 #define KERNEL_COHERENCY        0
 633 #else
 634 #define KERNEL_COHERENCY        1
 635 #endif
 636
 637 static int __init check_cache_coherency(void)
 638 {
 639         struct device_node *np;
 640         const void *prop;
 641         int devtree_coherency;
 642
 643         np = of_find_node_by_path("/");
 644         prop = of_get_property(np, "coherency-off", NULL);
 645         of_node_put(np);
 646
 647         devtree_coherency = prop ? 0 : 1;
 648
 649         if (devtree_coherency != KERNEL_COHERENCY) {
 650                 printk(KERN_ERR
 651                         "kernel coherency:%s != device tree_coherency:%s\n",
 652                         KERNEL_COHERENCY ? "on" : "off",
 653                         devtree_coherency ? "on" : "off");
 654                 BUG();
 655         }
 656
 657         return 0;
 658 }
 659
 660 late_initcall(check_cache_coherency);
 661 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 662
 663 #ifdef CONFIG_DEBUG_FS
 664 struct dentry *powerpc_debugfs_root;
 665
 666 static int powerpc_debugfs_init(void)
 667 {
 668         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 669
 670         return powerpc_debugfs_root == NULL;
 671 }
 672 arch_initcall(powerpc_debugfs_init);
 673 #endif
 674
 675 static int ppc_dflt_bus_notify(struct notifier_block *nb,
 676                                 unsigned long action, void *data)
 677 {
 678         struct device *dev = data;
 679
 680         /* We are only intereted in device addition */
 681         if (action != BUS_NOTIFY_ADD_DEVICE)
 682                 return 0;
 683
 684         set_dma_ops(dev, &dma_direct_ops);
 685
 686         return NOTIFY_DONE;
 687 }
 688
 689 static struct notifier_block ppc_dflt_plat_bus_notifier = {
 690         .notifier_call = ppc_dflt_bus_notify,
 691         .priority = INT_MAX,
 692 };
 693
 694 static struct notifier_block ppc_dflt_of_bus_notifier = {
 695         .notifier_call = ppc_dflt_bus_notify,
 696         .priority = INT_MAX,
 697 };
 698
 699 static int __init setup_bus_notifier(void)
 700 {
 701         bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
 702         bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier);
 703
 704         return 0;
 705 }
 706
 707 arch_initcall(setup_bus_notifier);