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/prom.h>
  40 #include <asm/processor.h>
  41 #include <asm/vdso_datapage.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/smp.h>
  44 #include <asm/elf.h>
  45 #include <asm/machdep.h>
  46 #include <asm/time.h>
  47 #include <asm/cputable.h>
  48 #include <asm/sections.h>
  49 #include <asm/firmware.h>
  50 #include <asm/btext.h>
  51 #include <asm/nvram.h>
  52 #include <asm/setup.h>
  53 #include <asm/system.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
  64 #include "setup.h"
  65
  66 #ifdef DEBUG
  67 #include <asm/udbg.h>
  68 #define DBG(fmt...) udbg_printf(fmt)
  69 #else
  70 #define DBG(fmt...)
  71 #endif
  72
  73 /* The main machine-dep calls structure
  74  */
  75 struct machdep_calls ppc_md;
  76 EXPORT_SYMBOL(ppc_md);
  77 struct machdep_calls *machine_id;
  78 EXPORT_SYMBOL(machine_id);
  79
  80 unsigned long klimit = (unsigned long) _end;
  81
  82 char cmd_line[COMMAND_LINE_SIZE];
  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
  96 #ifdef __DO_IRQ_CANON
  97 /* XXX should go elsewhere eventually */
  98 int ppc_do_canonicalize_irqs;
  99 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 100 #endif
 101
 102 /* also used by kexec */
 103 void machine_shutdown(void)
 104 {
 105         if (ppc_md.machine_shutdown)
 106                 ppc_md.machine_shutdown();
 107 }
 108
 109 void machine_restart(char *cmd)
 110 {
 111         machine_shutdown();
 112         if (ppc_md.restart)
 113                 ppc_md.restart(cmd);
 114 #ifdef CONFIG_SMP
 115         smp_send_stop();
 116 #endif
 117         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 118         local_irq_disable();
 119         while (1) ;
 120 }
 121
 122 void machine_power_off(void)
 123 {
 124         machine_shutdown();
 125         if (ppc_md.power_off)
 126                 ppc_md.power_off();
 127 #ifdef CONFIG_SMP
 128         smp_send_stop();
 129 #endif
 130         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 131         local_irq_disable();
 132         while (1) ;
 133 }
 134 /* Used by the G5 thermal driver */
 135 EXPORT_SYMBOL_GPL(machine_power_off);
 136
 137 void (*pm_power_off)(void) = machine_power_off;
 138 EXPORT_SYMBOL_GPL(pm_power_off);
 139
 140 void machine_halt(void)
 141 {
 142         machine_shutdown();
 143         if (ppc_md.halt)
 144                 ppc_md.halt();
 145 #ifdef CONFIG_SMP
 146         smp_send_stop();
 147 #endif
 148         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 149         local_irq_disable();
 150         while (1) ;
 151 }
 152
 153
 154 #ifdef CONFIG_TAU
 155 extern u32 cpu_temp(unsigned long cpu);
 156 extern u32 cpu_temp_both(unsigned long cpu);
 157 #endif /* CONFIG_TAU */
 158
 159 #ifdef CONFIG_SMP
 160 DEFINE_PER_CPU(unsigned int, pvr);
 161 #endif
 162
 163 static int show_cpuinfo(struct seq_file *m, void *v)
 164 {
 165         unsigned long cpu_id = (unsigned long)v - 1;
 166         unsigned int pvr;
 167         unsigned short maj;
 168         unsigned short min;
 169
 170         if (cpu_id == NR_CPUS) {
 171                 struct device_node *root;
 172                 const char *model = NULL;
 173 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 174                 unsigned long bogosum = 0;
 175                 int i;
 176                 for_each_online_cpu(i)
 177                         bogosum += loops_per_jiffy;
 178                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 179                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 180 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 181                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 182                 if (ppc_md.name)
 183                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 184                 root = of_find_node_by_path("/");
 185                 if (root)
 186                         model = of_get_property(root, "model", NULL);
 187                 if (model)
 188                         seq_printf(m, "model\t\t: %s\n", model);
 189                 of_node_put(root);
 190
 191                 if (ppc_md.show_cpuinfo != NULL)
 192                         ppc_md.show_cpuinfo(m);
 193
 194 #ifdef CONFIG_PPC32
 195                 /* Display the amount of memory */
 196                 seq_printf(m, "Memory\t\t: %d MB\n",
 197                            (unsigned int)(total_memory / (1024 * 1024)));
 198 #endif
 199
 200                 return 0;
 201         }
 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(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         return 0;
 311 }
 312
 313 static void *c_start(struct seq_file *m, loff_t *pos)
 314 {
 315         unsigned long i = *pos;
 316
 317         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 318 }
 319
 320 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 321 {
 322         ++*pos;
 323         return c_start(m, pos);
 324 }
 325
 326 static void c_stop(struct seq_file *m, void *v)
 327 {
 328 }
 329
 330 const struct seq_operations cpuinfo_op = {
 331         .start =c_start,
 332         .next = c_next,
 333         .stop = c_stop,
 334         .show = show_cpuinfo,
 335 };
 336
 337 void __init check_for_initrd(void)
 338 {
 339 #ifdef CONFIG_BLK_DEV_INITRD
 340         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 341             initrd_start, initrd_end);
 342
 343         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 344          * look sensible. If not, clear initrd reference.
 345          */
 346         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 347             initrd_end > initrd_start)
 348                 ROOT_DEV = Root_RAM0;
 349         else
 350                 initrd_start = initrd_end = 0;
 351
 352         if (initrd_start)
 353                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 354
 355         DBG(" <- check_for_initrd()\n");
 356 #endif /* CONFIG_BLK_DEV_INITRD */
 357 }
 358
 359 #ifdef CONFIG_SMP
 360
 361 int threads_per_core, threads_shift;
 362 cpumask_t threads_core_mask;
 363
 364 static void __init cpu_init_thread_core_maps(int tpc)
 365 {
 366         int i;
 367
 368         threads_per_core = tpc;
 369         threads_core_mask = CPU_MASK_NONE;
 370
 371         /* This implementation only supports power of 2 number of threads
 372          * for simplicity and performance
 373          */
 374         threads_shift = ilog2(tpc);
 375         BUG_ON(tpc != (1 << threads_shift));
 376
 377         for (i = 0; i < tpc; i++)
 378                 cpu_set(i, threads_core_mask);
 379
 380         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 381                tpc, tpc > 1 ? "s" : "");
 382         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 383 }
 384
 385
 386 /**
 387  * setup_cpu_maps - initialize the following cpu maps:
 388  *                  cpu_possible_map
 389  *                  cpu_present_map
 390  *
 391  * Having the possible map set up early allows us to restrict allocations
 392  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 393  *
 394  * We do not initialize the online map here; cpus set their own bits in
 395  * cpu_online_map as they come up.
 396  *
 397  * This function is valid only for Open Firmware systems.  finish_device_tree
 398  * must be called before using this.
 399  *
 400  * While we're here, we may as well set the "physical" cpu ids in the paca.
 401  *
 402  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 403  */
 404 void __init smp_setup_cpu_maps(void)
 405 {
 406         struct device_node *dn = NULL;
 407         int cpu = 0;
 408         int nthreads = 1;
 409
 410         DBG("smp_setup_cpu_maps()\n");
 411
 412         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 413                 const int *intserv;
 414                 int j, len;
 415
 416                 DBG("  * %s...\n", dn->full_name);
 417
 418                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 419                                 &len);
 420                 if (intserv) {
 421                         nthreads = len / sizeof(int);
 422                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 423                             nthreads);
 424                 } else {
 425                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 426                         intserv = of_get_property(dn, "reg", NULL);
 427                         if (!intserv)
 428                                 intserv = &cpu; /* assume logical == phys */
 429                 }
 430
 431                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 432                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 433                             j, cpu, intserv[j]);
 434                         set_cpu_present(cpu, true);
 435                         set_hard_smp_processor_id(cpu, intserv[j]);
 436                         set_cpu_possible(cpu, true);
 437                         cpu++;
 438                 }
 439         }
 440
 441         /* If no SMT supported, nthreads is forced to 1 */
 442         if (!cpu_has_feature(CPU_FTR_SMT)) {
 443                 DBG("  SMT disabled ! nthreads forced to 1\n");
 444                 nthreads = 1;
 445         }
 446
 447 #ifdef CONFIG_PPC64
 448         /*
 449          * On pSeries LPAR, we need to know how many cpus
 450          * could possibly be added to this partition.
 451          */
 452         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 453             (dn = of_find_node_by_path("/rtas"))) {
 454                 int num_addr_cell, num_size_cell, maxcpus;
 455                 const unsigned int *ireg;
 456
 457                 num_addr_cell = of_n_addr_cells(dn);
 458                 num_size_cell = of_n_size_cells(dn);
 459
 460                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 461
 462                 if (!ireg)
 463                         goto out;
 464
 465                 maxcpus = ireg[num_addr_cell + num_size_cell];
 466
 467                 /* Double maxcpus for processors which have SMT capability */
 468                 if (cpu_has_feature(CPU_FTR_SMT))
 469                         maxcpus *= nthreads;
 470
 471                 if (maxcpus > NR_CPUS) {
 472                         printk(KERN_WARNING
 473                                "Partition configured for %d cpus, "
 474                                "operating system maximum is %d.\n",
 475                                maxcpus, NR_CPUS);
 476                         maxcpus = NR_CPUS;
 477                 } else
 478                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 479                                maxcpus);
 480
 481                 for (cpu = 0; cpu < maxcpus; cpu++)
 482                         set_cpu_possible(cpu, true);
 483         out:
 484                 of_node_put(dn);
 485         }
 486         vdso_data->processorCount = num_present_cpus();
 487 #endif /* CONFIG_PPC64 */
 488
 489         /* Initialize CPU <=> thread mapping/
 490          *
 491          * WARNING: We assume that the number of threads is the same for
 492          * every CPU in the system. If that is not the case, then some code
 493          * here will have to be reworked
 494          */
 495         cpu_init_thread_core_maps(nthreads);
 496 }
 497 #endif /* CONFIG_SMP */
 498
 499 #ifdef CONFIG_PCSPKR_PLATFORM
 500 static __init int add_pcspkr(void)
 501 {
 502         struct device_node *np;
 503         struct platform_device *pd;
 504         int ret;
 505
 506         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 507         of_node_put(np);
 508         if (!np)
 509                 return -ENODEV;
 510
 511         pd = platform_device_alloc("pcspkr", -1);
 512         if (!pd)
 513                 return -ENOMEM;
 514
 515         ret = platform_device_add(pd);
 516         if (ret)
 517                 platform_device_put(pd);
 518
 519         return ret;
 520 }
 521 device_initcall(add_pcspkr);
 522 #endif  /* CONFIG_PCSPKR_PLATFORM */
 523
 524 void probe_machine(void)
 525 {
 526         extern struct machdep_calls __machine_desc_start;
 527         extern struct machdep_calls __machine_desc_end;
 528
 529         /*
 530          * Iterate all ppc_md structures until we find the proper
 531          * one for the current machine type
 532          */
 533         DBG("Probing machine type ...\n");
 534
 535         for (machine_id = &__machine_desc_start;
 536              machine_id < &__machine_desc_end;
 537              machine_id++) {
 538                 DBG("  %s ...", machine_id->name);
 539                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 540                 if (ppc_md.probe()) {
 541                         DBG(" match !\n");
 542                         break;
 543                 }
 544                 DBG("\n");
 545         }
 546         /* What can we do if we didn't find ? */
 547         if (machine_id >= &__machine_desc_end) {
 548                 DBG("No suitable machine found !\n");
 549                 for (;;);
 550         }
 551
 552         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 553 }
 554
 555 /* Match a class of boards, not a specific device configuration. */
 556 int check_legacy_ioport(unsigned long base_port)
 557 {
 558         struct device_node *parent, *np = NULL;
 559         int ret = -ENODEV;
 560
 561         switch(base_port) {
 562         case I8042_DATA_REG:
 563                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 564                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 565                 if (np) {
 566                         parent = of_get_parent(np);
 567                         of_node_put(np);
 568                         np = parent;
 569                         break;
 570                 }
 571                 np = of_find_node_by_type(NULL, "8042");
 572                 /* Pegasos has no device_type on its 8042 node, look for the
 573                  * name instead */
 574                 if (!np)
 575                         np = of_find_node_by_name(NULL, "8042");
 576                 break;
 577         case FDC_BASE: /* FDC1 */
 578                 np = of_find_node_by_type(NULL, "fdc");
 579                 break;
 580 #ifdef CONFIG_PPC_PREP
 581         case _PIDXR:
 582         case _PNPWRP:
 583         case PNPBIOS_BASE:
 584                 /* implement me */
 585 #endif
 586         default:
 587                 /* ipmi is supposed to fail here */
 588                 break;
 589         }
 590         if (!np)
 591                 return ret;
 592         parent = of_get_parent(np);
 593         if (parent) {
 594                 if (strcmp(parent->type, "isa") == 0)
 595                         ret = 0;
 596                 of_node_put(parent);
 597         }
 598         of_node_put(np);
 599         return ret;
 600 }
 601 EXPORT_SYMBOL(check_legacy_ioport);
 602
 603 static int ppc_panic_event(struct notifier_block *this,
 604                              unsigned long event, void *ptr)
 605 {
 606         ppc_md.panic(ptr);  /* May not return */
 607         return NOTIFY_DONE;
 608 }
 609
 610 static struct notifier_block ppc_panic_block = {
 611         .notifier_call = ppc_panic_event,
 612         .priority = INT_MIN /* may not return; must be done last */
 613 };
 614
 615 void __init setup_panic(void)
 616 {
 617         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 618 }
 619
 620 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 621 /*
 622  * For platforms that have configurable cache-coherency.  This function
 623  * checks that the cache coherency setting of the kernel matches the setting
 624  * left by the firmware, as indicated in the device tree.  Since a mismatch
 625  * will eventually result in DMA failures, we print * and error and call
 626  * BUG() in that case.
 627  */
 628
 629 #ifdef CONFIG_NOT_COHERENT_CACHE
 630 #define KERNEL_COHERENCY        0
 631 #else
 632 #define KERNEL_COHERENCY        1
 633 #endif
 634
 635 static int __init check_cache_coherency(void)
 636 {
 637         struct device_node *np;
 638         const void *prop;
 639         int devtree_coherency;
 640
 641         np = of_find_node_by_path("/");
 642         prop = of_get_property(np, "coherency-off", NULL);
 643         of_node_put(np);
 644
 645         devtree_coherency = prop ? 0 : 1;
 646
 647         if (devtree_coherency != KERNEL_COHERENCY) {
 648                 printk(KERN_ERR
 649                         "kernel coherency:%s != device tree_coherency:%s\n",
 650                         KERNEL_COHERENCY ? "on" : "off",
 651                         devtree_coherency ? "on" : "off");
 652                 BUG();
 653         }
 654
 655         return 0;
 656 }
 657
 658 late_initcall(check_cache_coherency);
 659 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 660
 661 #ifdef CONFIG_DEBUG_FS
 662 struct dentry *powerpc_debugfs_root;
 663
 664 static int powerpc_debugfs_init(void)
 665 {
 666         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 667
 668         return powerpc_debugfs_root == NULL;
 669 }
 670 arch_initcall(powerpc_debugfs_init);
 671 #endif
 672
 673 static int ppc_dflt_bus_notify(struct notifier_block *nb,
 674                                 unsigned long action, void *data)
 675 {
 676         struct device *dev = data;
 677
 678         /* We are only intereted in device addition */
 679         if (action != BUS_NOTIFY_ADD_DEVICE)
 680                 return 0;
 681
 682         set_dma_ops(dev, &dma_direct_ops);
 683
 684         return NOTIFY_DONE;
 685 }
 686
 687 static struct notifier_block ppc_dflt_plat_bus_notifier = {
 688         .notifier_call = ppc_dflt_bus_notify,
 689         .priority = INT_MAX,
 690 };
 691
 692 static struct notifier_block ppc_dflt_of_bus_notifier = {
 693         .notifier_call = ppc_dflt_bus_notify,
 694         .priority = INT_MAX,
 695 };
 696
 697 static int __init setup_bus_notifier(void)
 698 {
 699         bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
 700         bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier);
 701
 702         return 0;
 703 }
 704
 705 arch_initcall(setup_bus_notifier);