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