arch/powerpc/kernel/setup-common.c

   1 /*
   2  * Common boot and setup code for both 32-bit and 64-bit.
   3  * Extracted from arch/powerpc/kernel/setup_64.c.
   4  *
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #undef DEBUG
  14
  15 #include <linux/export.h>
  16 #include <linux/string.h>
  17 #include <linux/sched.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/reboot.h>
  21 #include <linux/delay.h>
  22 #include <linux/initrd.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/ioport.h>
  26 #include <linux/console.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/notifier.h>
  30 #include <linux/cpu.h>
  31 #include <linux/unistd.h>
  32 #include <linux/serial.h>
  33 #include <linux/serial_8250.h>
  34 #include <linux/percpu.h>
  35 #include <linux/memblock.h>
  36 #include <linux/of_platform.h>
  37 #include <linux/hugetlb.h>
  38 #include <asm/debugfs.h>
  39 #include <asm/io.h>
  40 #include <asm/paca.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/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 #include <asm/fadump.h>
  65 #include <asm/udbg.h>
  66 #include <asm/hugetlb.h>
  67 #include <asm/livepatch.h>
  68 #include <asm/mmu_context.h>
  69 #include <asm/cpu_has_feature.h>
  70
  71 #include "setup.h"
  72
  73 #ifdef DEBUG
  74 #include <asm/udbg.h>
  75 #define DBG(fmt...) udbg_printf(fmt)
  76 #else
  77 #define DBG(fmt...)
  78 #endif
  79
  80 /* The main machine-dep calls structure
  81  */
  82 struct machdep_calls ppc_md;
  83 EXPORT_SYMBOL(ppc_md);
  84 struct machdep_calls *machine_id;
  85 EXPORT_SYMBOL(machine_id);
  86
  87 int boot_cpuid = -1;
  88 EXPORT_SYMBOL_GPL(boot_cpuid);
  89
  90 /*
  91  * These are used in binfmt_elf.c to put aux entries on the stack
  92  * for each elf executable being started.
  93  */
  94 int dcache_bsize;
  95 int icache_bsize;
  96 int ucache_bsize;
  97
  98
  99 unsigned long klimit = (unsigned long) _end;
 100
 101 /*
 102  * This still seems to be needed... -- paulus
 103  */
 104 struct screen_info screen_info = {
 105         .orig_x = 0,
 106         .orig_y = 25,
 107         .orig_video_cols = 80,
 108         .orig_video_lines = 25,
 109         .orig_video_isVGA = 1,
 110         .orig_video_points = 16
 111 };
 112 #if defined(CONFIG_FB_VGA16_MODULE)
 113 EXPORT_SYMBOL(screen_info);
 114 #endif
 115
 116 /* Variables required to store legacy IO irq routing */
 117 int of_i8042_kbd_irq;
 118 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 119 int of_i8042_aux_irq;
 120 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 121
 122 #ifdef __DO_IRQ_CANON
 123 /* XXX should go elsewhere eventually */
 124 int ppc_do_canonicalize_irqs;
 125 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 126 #endif
 127
 128 #ifdef CONFIG_CRASH_CORE
 129 /* This keeps a track of which one is the crashing cpu. */
 130 int crashing_cpu = -1;
 131 #endif
 132
 133 /* also used by kexec */
 134 void machine_shutdown(void)
 135 {
 136 #ifdef CONFIG_FA_DUMP
 137         /*
 138          * if fadump is active, cleanup the fadump registration before we
 139          * shutdown.
 140          */
 141         fadump_cleanup();
 142 #endif
 143
 144         if (ppc_md.machine_shutdown)
 145                 ppc_md.machine_shutdown();
 146 }
 147
 148 static void machine_hang(void)
 149 {
 150         pr_emerg("System Halted, OK to turn off power\n");
 151         local_irq_disable();
 152         while (1)
 153                 ;
 154 }
 155
 156 void machine_restart(char *cmd)
 157 {
 158         machine_shutdown();
 159         if (ppc_md.restart)
 160                 ppc_md.restart(cmd);
 161
 162         smp_send_stop();
 163
 164         do_kernel_restart(cmd);
 165         mdelay(1000);
 166
 167         machine_hang();
 168 }
 169
 170 void machine_power_off(void)
 171 {
 172         machine_shutdown();
 173         if (pm_power_off)
 174                 pm_power_off();
 175
 176         smp_send_stop();
 177         machine_hang();
 178 }
 179 /* Used by the G5 thermal driver */
 180 EXPORT_SYMBOL_GPL(machine_power_off);
 181
 182 void (*pm_power_off)(void);
 183 EXPORT_SYMBOL_GPL(pm_power_off);
 184
 185 void machine_halt(void)
 186 {
 187         machine_shutdown();
 188         if (ppc_md.halt)
 189                 ppc_md.halt();
 190
 191         smp_send_stop();
 192         machine_hang();
 193 }
 194
 195 #ifdef CONFIG_SMP
 196 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 197 #endif
 198
 199 static void show_cpuinfo_summary(struct seq_file *m)
 200 {
 201         struct device_node *root;
 202         const char *model = NULL;
 203 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 204         unsigned long bogosum = 0;
 205         int i;
 206         for_each_online_cpu(i)
 207                 bogosum += loops_per_jiffy;
 208         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 209                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 210 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 211         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 212         if (ppc_md.name)
 213                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 214         root = of_find_node_by_path("/");
 215         if (root)
 216                 model = of_get_property(root, "model", NULL);
 217         if (model)
 218                 seq_printf(m, "model\t\t: %s\n", model);
 219         of_node_put(root);
 220
 221         if (ppc_md.show_cpuinfo != NULL)
 222                 ppc_md.show_cpuinfo(m);
 223
 224 #ifdef CONFIG_PPC32
 225         /* Display the amount of memory */
 226         seq_printf(m, "Memory\t\t: %d MB\n",
 227                    (unsigned int)(total_memory / (1024 * 1024)));
 228 #endif
 229 }
 230
 231 static int show_cpuinfo(struct seq_file *m, void *v)
 232 {
 233         unsigned long cpu_id = (unsigned long)v - 1;
 234         unsigned int pvr;
 235         unsigned long proc_freq;
 236         unsigned short maj;
 237         unsigned short min;
 238
 239 #ifdef CONFIG_SMP
 240         pvr = per_cpu(cpu_pvr, cpu_id);
 241 #else
 242         pvr = mfspr(SPRN_PVR);
 243 #endif
 244         maj = (pvr >> 8) & 0xFF;
 245         min = pvr & 0xFF;
 246
 247         seq_printf(m, "processor\t: %lu\n", cpu_id);
 248         seq_printf(m, "cpu\t\t: ");
 249
 250         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 251                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 252         else
 253                 seq_printf(m, "unknown (%08x)", pvr);
 254
 255 #ifdef CONFIG_ALTIVEC
 256         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 257                 seq_printf(m, ", altivec supported");
 258 #endif /* CONFIG_ALTIVEC */
 259
 260         seq_printf(m, "\n");
 261
 262 #ifdef CONFIG_TAU
 263         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 264 #ifdef CONFIG_TAU_AVERAGE
 265                 /* more straightforward, but potentially misleading */
 266                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 267                            cpu_temp(cpu_id));
 268 #else
 269                 /* show the actual temp sensor range */
 270                 u32 temp;
 271                 temp = cpu_temp_both(cpu_id);
 272                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 273                            temp & 0xff, temp >> 16);
 274 #endif
 275         }
 276 #endif /* CONFIG_TAU */
 277
 278         /*
 279          * Platforms that have variable clock rates, should implement
 280          * the method ppc_md.get_proc_freq() that reports the clock
 281          * rate of a given cpu. The rest can use ppc_proc_freq to
 282          * report the clock rate that is same across all cpus.
 283          */
 284         if (ppc_md.get_proc_freq)
 285                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 286         else
 287                 proc_freq = ppc_proc_freq;
 288
 289         if (proc_freq)
 290                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 291                            proc_freq / 1000000, proc_freq % 1000000);
 292
 293         if (ppc_md.show_percpuinfo != NULL)
 294                 ppc_md.show_percpuinfo(m, cpu_id);
 295
 296         /* If we are a Freescale core do a simple check so
 297          * we dont have to keep adding cases in the future */
 298         if (PVR_VER(pvr) & 0x8000) {
 299                 switch (PVR_VER(pvr)) {
 300                 case 0x8000:    /* 7441/7450/7451, Voyager */
 301                 case 0x8001:    /* 7445/7455, Apollo 6 */
 302                 case 0x8002:    /* 7447/7457, Apollo 7 */
 303                 case 0x8003:    /* 7447A, Apollo 7 PM */
 304                 case 0x8004:    /* 7448, Apollo 8 */
 305                 case 0x800c:    /* 7410, Nitro */
 306                         maj = ((pvr >> 8) & 0xF);
 307                         min = PVR_MIN(pvr);
 308                         break;
 309                 default:        /* e500/book-e */
 310                         maj = PVR_MAJ(pvr);
 311                         min = PVR_MIN(pvr);
 312                         break;
 313                 }
 314         } else {
 315                 switch (PVR_VER(pvr)) {
 316                         case 0x0020:    /* 403 family */
 317                                 maj = PVR_MAJ(pvr) + 1;
 318                                 min = PVR_MIN(pvr);
 319                                 break;
 320                         case 0x1008:    /* 740P/750P ?? */
 321                                 maj = ((pvr >> 8) & 0xFF) - 1;
 322                                 min = pvr & 0xFF;
 323                                 break;
 324                         case 0x004e: /* POWER9 bits 12-15 give chip type */
 325                                 maj = (pvr >> 8) & 0x0F;
 326                                 min = pvr & 0xFF;
 327                                 break;
 328                         default:
 329                                 maj = (pvr >> 8) & 0xFF;
 330                                 min = pvr & 0xFF;
 331                                 break;
 332                 }
 333         }
 334
 335         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 336                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 337
 338 #ifdef CONFIG_PPC32
 339         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 340                    loops_per_jiffy / (500000/HZ),
 341                    (loops_per_jiffy / (5000/HZ)) % 100);
 342 #endif
 343         seq_printf(m, "\n");
 344
 345         /* If this is the last cpu, print the summary */
 346         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 347                 show_cpuinfo_summary(m);
 348
 349         return 0;
 350 }
 351
 352 static void *c_start(struct seq_file *m, loff_t *pos)
 353 {
 354         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 355                 *pos = cpumask_first(cpu_online_mask);
 356         else
 357                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 358         if ((*pos) < nr_cpu_ids)
 359                 return (void *)(unsigned long)(*pos + 1);
 360         return NULL;
 361 }
 362
 363 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 364 {
 365         (*pos)++;
 366         return c_start(m, pos);
 367 }
 368
 369 static void c_stop(struct seq_file *m, void *v)
 370 {
 371 }
 372
 373 const struct seq_operations cpuinfo_op = {
 374         .start  = c_start,
 375         .next   = c_next,
 376         .stop   = c_stop,
 377         .show   = show_cpuinfo,
 378 };
 379
 380 void __init check_for_initrd(void)
 381 {
 382 #ifdef CONFIG_BLK_DEV_INITRD
 383         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 384             initrd_start, initrd_end);
 385
 386         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 387          * look sensible. If not, clear initrd reference.
 388          */
 389         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 390             initrd_end > initrd_start)
 391                 ROOT_DEV = Root_RAM0;
 392         else
 393                 initrd_start = initrd_end = 0;
 394
 395         if (initrd_start)
 396                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 397
 398         DBG(" <- check_for_initrd()\n");
 399 #endif /* CONFIG_BLK_DEV_INITRD */
 400 }
 401
 402 #ifdef CONFIG_SMP
 403
 404 int threads_per_core, threads_per_subcore, threads_shift;
 405 cpumask_t threads_core_mask;
 406 EXPORT_SYMBOL_GPL(threads_per_core);
 407 EXPORT_SYMBOL_GPL(threads_per_subcore);
 408 EXPORT_SYMBOL_GPL(threads_shift);
 409 EXPORT_SYMBOL_GPL(threads_core_mask);
 410
 411 static void __init cpu_init_thread_core_maps(int tpc)
 412 {
 413         int i;
 414
 415         threads_per_core = tpc;
 416         threads_per_subcore = tpc;
 417         cpumask_clear(&threads_core_mask);
 418
 419         /* This implementation only supports power of 2 number of threads
 420          * for simplicity and performance
 421          */
 422         threads_shift = ilog2(tpc);
 423         BUG_ON(tpc != (1 << threads_shift));
 424
 425         for (i = 0; i < tpc; i++)
 426                 cpumask_set_cpu(i, &threads_core_mask);
 427
 428         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 429                tpc, tpc > 1 ? "s" : "");
 430         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 431 }
 432
 433
 434 u32 *cpu_to_phys_id = NULL;
 435
 436 /**
 437  * setup_cpu_maps - initialize the following cpu maps:
 438  *                  cpu_possible_mask
 439  *                  cpu_present_mask
 440  *
 441  * Having the possible map set up early allows us to restrict allocations
 442  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 443  *
 444  * We do not initialize the online map here; cpus set their own bits in
 445  * cpu_online_mask as they come up.
 446  *
 447  * This function is valid only for Open Firmware systems.  finish_device_tree
 448  * must be called before using this.
 449  *
 450  * While we're here, we may as well set the "physical" cpu ids in the paca.
 451  *
 452  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 453  */
 454 void __init smp_setup_cpu_maps(void)
 455 {
 456         struct device_node *dn;
 457         int cpu = 0;
 458         int nthreads = 1;
 459
 460         DBG("smp_setup_cpu_maps()\n");
 461
 462         cpu_to_phys_id = __va(memblock_alloc(nr_cpu_ids * sizeof(u32),
 463                                                         __alignof__(u32)));
 464         memset(cpu_to_phys_id, 0, nr_cpu_ids * sizeof(u32));
 465
 466         for_each_node_by_type(dn, "cpu") {
 467                 const __be32 *intserv;
 468                 __be32 cpu_be;
 469                 int j, len;
 470
 471                 DBG("  * %pOF...\n", dn);
 472
 473                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 474                                 &len);
 475                 if (intserv) {
 476                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 477                             nthreads);
 478                 } else {
 479                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 480                         intserv = of_get_property(dn, "reg", &len);
 481                         if (!intserv) {
 482                                 cpu_be = cpu_to_be32(cpu);
 483                                 /* XXX: what is this? uninitialized?? */
 484                                 intserv = &cpu_be;      /* assume logical == phys */
 485                                 len = 4;
 486                         }
 487                 }
 488
 489                 nthreads = len / sizeof(int);
 490
 491                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 492                         bool avail;
 493
 494                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 495                             j, cpu, be32_to_cpu(intserv[j]));
 496
 497                         avail = of_device_is_available(dn);
 498                         if (!avail)
 499                                 avail = !of_property_match_string(dn,
 500                                                 "enable-method", "spin-table");
 501
 502                         set_cpu_present(cpu, avail);
 503                         set_cpu_possible(cpu, true);
 504                         cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
 505                         cpu++;
 506                 }
 507
 508                 if (cpu >= nr_cpu_ids) {
 509                         of_node_put(dn);
 510                         break;
 511                 }
 512         }
 513
 514         /* If no SMT supported, nthreads is forced to 1 */
 515         if (!cpu_has_feature(CPU_FTR_SMT)) {
 516                 DBG("  SMT disabled ! nthreads forced to 1\n");
 517                 nthreads = 1;
 518         }
 519
 520 #ifdef CONFIG_PPC64
 521         /*
 522          * On pSeries LPAR, we need to know how many cpus
 523          * could possibly be added to this partition.
 524          */
 525         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 526             (dn = of_find_node_by_path("/rtas"))) {
 527                 int num_addr_cell, num_size_cell, maxcpus;
 528                 const __be32 *ireg;
 529
 530                 num_addr_cell = of_n_addr_cells(dn);
 531                 num_size_cell = of_n_size_cells(dn);
 532
 533                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 534
 535                 if (!ireg)
 536                         goto out;
 537
 538                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 539
 540                 /* Double maxcpus for processors which have SMT capability */
 541                 if (cpu_has_feature(CPU_FTR_SMT))
 542                         maxcpus *= nthreads;
 543
 544                 if (maxcpus > nr_cpu_ids) {
 545                         printk(KERN_WARNING
 546                                "Partition configured for %d cpus, "
 547                                "operating system maximum is %u.\n",
 548                                maxcpus, nr_cpu_ids);
 549                         maxcpus = nr_cpu_ids;
 550                 } else
 551                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 552                                maxcpus);
 553
 554                 for (cpu = 0; cpu < maxcpus; cpu++)
 555                         set_cpu_possible(cpu, true);
 556         out:
 557                 of_node_put(dn);
 558         }
 559         vdso_data->processorCount = num_present_cpus();
 560 #endif /* CONFIG_PPC64 */
 561
 562         /* Initialize CPU <=> thread mapping/
 563          *
 564          * WARNING: We assume that the number of threads is the same for
 565          * every CPU in the system. If that is not the case, then some code
 566          * here will have to be reworked
 567          */
 568         cpu_init_thread_core_maps(nthreads);
 569
 570         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 571         setup_nr_cpu_ids();
 572
 573         free_unused_pacas();
 574 }
 575 #endif /* CONFIG_SMP */
 576
 577 #ifdef CONFIG_PCSPKR_PLATFORM
 578 static __init int add_pcspkr(void)
 579 {
 580         struct device_node *np;
 581         struct platform_device *pd;
 582         int ret;
 583
 584         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 585         of_node_put(np);
 586         if (!np)
 587                 return -ENODEV;
 588
 589         pd = platform_device_alloc("pcspkr", -1);
 590         if (!pd)
 591                 return -ENOMEM;
 592
 593         ret = platform_device_add(pd);
 594         if (ret)
 595                 platform_device_put(pd);
 596
 597         return ret;
 598 }
 599 device_initcall(add_pcspkr);
 600 #endif  /* CONFIG_PCSPKR_PLATFORM */
 601
 602 void probe_machine(void)
 603 {
 604         extern struct machdep_calls __machine_desc_start;
 605         extern struct machdep_calls __machine_desc_end;
 606         unsigned int i;
 607
 608         /*
 609          * Iterate all ppc_md structures until we find the proper
 610          * one for the current machine type
 611          */
 612         DBG("Probing machine type ...\n");
 613
 614         /*
 615          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 616          * entry before probe_machine() which will be overwritten
 617          */
 618         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 619                 if (((void **)&ppc_md)[i]) {
 620                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 621                                " machine probe !\n", i);
 622                 }
 623         }
 624
 625         for (machine_id = &__machine_desc_start;
 626              machine_id < &__machine_desc_end;
 627              machine_id++) {
 628                 DBG("  %s ...", machine_id->name);
 629                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 630                 if (ppc_md.probe()) {
 631                         DBG(" match !\n");
 632                         break;
 633                 }
 634                 DBG("\n");
 635         }
 636         /* What can we do if we didn't find ? */
 637         if (machine_id >= &__machine_desc_end) {
 638                 DBG("No suitable machine found !\n");
 639                 for (;;);
 640         }
 641
 642         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 643 }
 644
 645 /* Match a class of boards, not a specific device configuration. */
 646 int check_legacy_ioport(unsigned long base_port)
 647 {
 648         struct device_node *parent, *np = NULL;
 649         int ret = -ENODEV;
 650
 651         switch(base_port) {
 652         case I8042_DATA_REG:
 653                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 654                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 655                 if (np) {
 656                         parent = of_get_parent(np);
 657
 658                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 659                         if (!of_i8042_kbd_irq)
 660                                 of_i8042_kbd_irq = 1;
 661
 662                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 663                         if (!of_i8042_aux_irq)
 664                                 of_i8042_aux_irq = 12;
 665
 666                         of_node_put(np);
 667                         np = parent;
 668                         break;
 669                 }
 670                 np = of_find_node_by_type(NULL, "8042");
 671                 /* Pegasos has no device_type on its 8042 node, look for the
 672                  * name instead */
 673                 if (!np)
 674                         np = of_find_node_by_name(NULL, "8042");
 675                 if (np) {
 676                         of_i8042_kbd_irq = 1;
 677                         of_i8042_aux_irq = 12;
 678                 }
 679                 break;
 680         case FDC_BASE: /* FDC1 */
 681                 np = of_find_node_by_type(NULL, "fdc");
 682                 break;
 683         default:
 684                 /* ipmi is supposed to fail here */
 685                 break;
 686         }
 687         if (!np)
 688                 return ret;
 689         parent = of_get_parent(np);
 690         if (parent) {
 691                 if (strcmp(parent->type, "isa") == 0)
 692                         ret = 0;
 693                 of_node_put(parent);
 694         }
 695         of_node_put(np);
 696         return ret;
 697 }
 698 EXPORT_SYMBOL(check_legacy_ioport);
 699
 700 static int ppc_panic_event(struct notifier_block *this,
 701                              unsigned long event, void *ptr)
 702 {
 703         /*
 704          * If firmware-assisted dump has been registered then trigger
 705          * firmware-assisted dump and let firmware handle everything else.
 706          */
 707         crash_fadump(NULL, ptr);
 708         ppc_md.panic(ptr);  /* May not return */
 709         return NOTIFY_DONE;
 710 }
 711
 712 static struct notifier_block ppc_panic_block = {
 713         .notifier_call = ppc_panic_event,
 714         .priority = INT_MIN /* may not return; must be done last */
 715 };
 716
 717 void __init setup_panic(void)
 718 {
 719         if (!ppc_md.panic)
 720                 return;
 721         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 722 }
 723
 724 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 725 /*
 726  * For platforms that have configurable cache-coherency.  This function
 727  * checks that the cache coherency setting of the kernel matches the setting
 728  * left by the firmware, as indicated in the device tree.  Since a mismatch
 729  * will eventually result in DMA failures, we print * and error and call
 730  * BUG() in that case.
 731  */
 732
 733 #ifdef CONFIG_NOT_COHERENT_CACHE
 734 #define KERNEL_COHERENCY        0
 735 #else
 736 #define KERNEL_COHERENCY        1
 737 #endif
 738
 739 static int __init check_cache_coherency(void)
 740 {
 741         struct device_node *np;
 742         const void *prop;
 743         int devtree_coherency;
 744
 745         np = of_find_node_by_path("/");
 746         prop = of_get_property(np, "coherency-off", NULL);
 747         of_node_put(np);
 748
 749         devtree_coherency = prop ? 0 : 1;
 750
 751         if (devtree_coherency != KERNEL_COHERENCY) {
 752                 printk(KERN_ERR
 753                         "kernel coherency:%s != device tree_coherency:%s\n",
 754                         KERNEL_COHERENCY ? "on" : "off",
 755                         devtree_coherency ? "on" : "off");
 756                 BUG();
 757         }
 758
 759         return 0;
 760 }
 761
 762 late_initcall(check_cache_coherency);
 763 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 764
 765 #ifdef CONFIG_DEBUG_FS
 766 struct dentry *powerpc_debugfs_root;
 767 EXPORT_SYMBOL(powerpc_debugfs_root);
 768
 769 static int powerpc_debugfs_init(void)
 770 {
 771         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 772
 773         return powerpc_debugfs_root == NULL;
 774 }
 775 arch_initcall(powerpc_debugfs_init);
 776 #endif
 777
 778 void ppc_printk_progress(char *s, unsigned short hex)
 779 {
 780         pr_info("%s\n", s);
 781 }
 782
 783 void arch_setup_pdev_archdata(struct platform_device *pdev)
 784 {
 785         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 786         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 787         set_dma_ops(&pdev->dev, &dma_nommu_ops);
 788 }
 789
 790 static __init void print_system_info(void)
 791 {
 792         pr_info("-----------------------------------------------------\n");
 793 #ifdef CONFIG_PPC_BOOK3S_64
 794         pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
 795 #endif
 796 #ifdef CONFIG_PPC_STD_MMU_32
 797         pr_info("Hash_size         = 0x%lx\n", Hash_size);
 798 #endif
 799         pr_info("phys_mem_size     = 0x%llx\n",
 800                 (unsigned long long)memblock_phys_mem_size());
 801
 802         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 803         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 804         if (ucache_bsize != 0)
 805                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 806
 807         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 808         pr_info("  possible        = 0x%016lx\n",
 809                 (unsigned long)CPU_FTRS_POSSIBLE);
 810         pr_info("  always          = 0x%016lx\n",
 811                 (unsigned long)CPU_FTRS_ALWAYS);
 812         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 813                 cur_cpu_spec->cpu_user_features,
 814                 cur_cpu_spec->cpu_user_features2);
 815         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 816 #ifdef CONFIG_PPC64
 817         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 818 #endif
 819
 820 #ifdef CONFIG_PPC_BOOK3S_64
 821         if (htab_address)
 822                 pr_info("htab_address      = 0x%p\n", htab_address);
 823         if (htab_hash_mask)
 824                 pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
 825 #endif
 826 #ifdef CONFIG_PPC_STD_MMU_32
 827         if (Hash)
 828                 pr_info("Hash              = 0x%p\n", Hash);
 829         if (Hash_mask)
 830                 pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
 831 #endif
 832
 833         if (PHYSICAL_START > 0)
 834                 pr_info("physical_start    = 0x%llx\n",
 835                        (unsigned long long)PHYSICAL_START);
 836         pr_info("-----------------------------------------------------\n");
 837 }
 838
 839 #ifdef CONFIG_SMP
 840 static void smp_setup_pacas(void)
 841 {
 842         int cpu;
 843
 844         for_each_possible_cpu(cpu) {
 845                 if (cpu == smp_processor_id())
 846                         continue;
 847                 allocate_paca(cpu);
 848                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 849         }
 850
 851         memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
 852         cpu_to_phys_id = NULL;
 853 }
 854 #endif
 855
 856 /*
 857  * Called into from start_kernel this initializes memblock, which is used
 858  * to manage page allocation until mem_init is called.
 859  */
 860 void __init setup_arch(char **cmdline_p)
 861 {
 862         *cmdline_p = boot_command_line;
 863
 864         /* Set a half-reasonable default so udelay does something sensible */
 865         loops_per_jiffy = 500000000 / HZ;
 866
 867         /* Unflatten the device-tree passed by prom_init or kexec */
 868         unflatten_device_tree();
 869
 870         /*
 871          * Initialize cache line/block info from device-tree (on ppc64) or
 872          * just cputable (on ppc32).
 873          */
 874         initialize_cache_info();
 875
 876         /* Initialize RTAS if available. */
 877         rtas_initialize();
 878
 879         /* Check if we have an initrd provided via the device-tree. */
 880         check_for_initrd();
 881
 882         /* Probe the machine type, establish ppc_md. */
 883         probe_machine();
 884
 885         /* Setup panic notifier if requested by the platform. */
 886         setup_panic();
 887
 888         /*
 889          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 890          * it from their respective probe() function.
 891          */
 892         setup_power_save();
 893
 894         /* Discover standard serial ports. */
 895         find_legacy_serial_ports();
 896
 897         /* Register early console with the printk subsystem. */
 898         register_early_udbg_console();
 899
 900         /* Setup the various CPU maps based on the device-tree. */
 901         smp_setup_cpu_maps();
 902
 903         /* Initialize xmon. */
 904         xmon_setup();
 905
 906         /* Check the SMT related command line arguments (ppc64). */
 907         check_smt_enabled();
 908
 909         /* Parse memory topology */
 910         mem_topology_setup();
 911
 912         /*
 913          * Release secondary cpus out of their spinloops at 0x60 now that
 914          * we can map physical -> logical CPU ids.
 915          *
 916          * Freescale Book3e parts spin in a loop provided by firmware,
 917          * so smp_release_cpus() does nothing for them.
 918          */
 919 #ifdef CONFIG_SMP
 920         smp_setup_pacas();
 921
 922         /* On BookE, setup per-core TLB data structures. */
 923         setup_tlb_core_data();
 924
 925         smp_release_cpus();
 926 #endif
 927
 928         /* Print various info about the machine that has been gathered so far. */
 929         print_system_info();
 930
 931         /* Reserve large chunks of memory for use by CMA for KVM. */
 932         kvm_cma_reserve();
 933
 934         klp_init_thread_info(&init_thread_info);
 935
 936         init_mm.start_code = (unsigned long)_stext;
 937         init_mm.end_code = (unsigned long) _etext;
 938         init_mm.end_data = (unsigned long) _edata;
 939         init_mm.brk = klimit;
 940
 941 #ifdef CONFIG_PPC_MM_SLICES
 942 #ifdef CONFIG_PPC64
 943         if (!radix_enabled())
 944                 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64;
 945 #elif defined(CONFIG_PPC_8xx)
 946         init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW;
 947 #else
 948 #error  "context.addr_limit not initialized."
 949 #endif
 950 #endif
 951
 952 #ifdef CONFIG_SPAPR_TCE_IOMMU
 953         mm_iommu_init(&init_mm);
 954 #endif
 955         irqstack_early_init();
 956         exc_lvl_early_init();
 957         emergency_stack_init();
 958
 959         initmem_init();
 960
 961 #ifdef CONFIG_DUMMY_CONSOLE
 962         conswitchp = &dummy_con;
 963 #endif
 964         if (ppc_md.setup_arch)
 965                 ppc_md.setup_arch();
 966
 967         paging_init();
 968
 969         /* Initialize the MMU context management stuff. */
 970         mmu_context_init();
 971
 972 #ifdef CONFIG_PPC64
 973         /* Interrupt code needs to be 64K-aligned. */
 974         if ((unsigned long)_stext & 0xffff)
 975                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 976                       (unsigned long)_stext);
 977 #endif
 978 }