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