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/bootmem.h>
  37 #include <linux/of_platform.h>
  38 #include <linux/hugetlb.h>
  39 #include <asm/debugfs.h>
  40 #include <asm/io.h>
  41 #include <asm/paca.h>
  42 #include <asm/prom.h>
  43 #include <asm/processor.h>
  44 #include <asm/vdso_datapage.h>
  45 #include <asm/pgtable.h>
  46 #include <asm/smp.h>
  47 #include <asm/elf.h>
  48 #include <asm/machdep.h>
  49 #include <asm/time.h>
  50 #include <asm/cputable.h>
  51 #include <asm/sections.h>
  52 #include <asm/firmware.h>
  53 #include <asm/btext.h>
  54 #include <asm/nvram.h>
  55 #include <asm/setup.h>
  56 #include <asm/rtas.h>
  57 #include <asm/iommu.h>
  58 #include <asm/serial.h>
  59 #include <asm/cache.h>
  60 #include <asm/page.h>
  61 #include <asm/mmu.h>
  62 #include <asm/xmon.h>
  63 #include <asm/cputhreads.h>
  64 #include <mm/mmu_decl.h>
  65 #include <asm/fadump.h>
  66 #include <asm/udbg.h>
  67 #include <asm/hugetlb.h>
  68 #include <asm/livepatch.h>
  69 #include <asm/mmu_context.h>
  70 #include <asm/cpu_has_feature.h>
  71
  72 #include "setup.h"
  73
  74 #ifdef DEBUG
  75 #include <asm/udbg.h>
  76 #define DBG(fmt...) udbg_printf(fmt)
  77 #else
  78 #define DBG(fmt...)
  79 #endif
  80
  81 /* The main machine-dep calls structure
  82  */
  83 struct machdep_calls ppc_md;
  84 EXPORT_SYMBOL(ppc_md);
  85 struct machdep_calls *machine_id;
  86 EXPORT_SYMBOL(machine_id);
  87
  88 int boot_cpuid = -1;
  89 EXPORT_SYMBOL_GPL(boot_cpuid);
  90
  91 /*
  92  * These are used in binfmt_elf.c to put aux entries on the stack
  93  * for each elf executable being started.
  94  */
  95 int dcache_bsize;
  96 int icache_bsize;
  97 int ucache_bsize;
  98
  99
 100 unsigned long klimit = (unsigned long) _end;
 101
 102 /*
 103  * This still seems to be needed... -- paulus
 104  */
 105 struct screen_info screen_info = {
 106         .orig_x = 0,
 107         .orig_y = 25,
 108         .orig_video_cols = 80,
 109         .orig_video_lines = 25,
 110         .orig_video_isVGA = 1,
 111         .orig_video_points = 16
 112 };
 113 #if defined(CONFIG_FB_VGA16_MODULE)
 114 EXPORT_SYMBOL(screen_info);
 115 #endif
 116
 117 /* Variables required to store legacy IO irq routing */
 118 int of_i8042_kbd_irq;
 119 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 120 int of_i8042_aux_irq;
 121 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 122
 123 #ifdef __DO_IRQ_CANON
 124 /* XXX should go elsewhere eventually */
 125 int ppc_do_canonicalize_irqs;
 126 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 127 #endif
 128
 129 #ifdef CONFIG_CRASH_CORE
 130 /* This keeps a track of which one is the crashing cpu. */
 131 int crashing_cpu = -1;
 132 #endif
 133
 134 /* also used by kexec */
 135 void machine_shutdown(void)
 136 {
 137 #ifdef CONFIG_FA_DUMP
 138         /*
 139          * if fadump is active, cleanup the fadump registration before we
 140          * shutdown.
 141          */
 142         fadump_cleanup();
 143 #endif
 144
 145         if (ppc_md.machine_shutdown)
 146                 ppc_md.machine_shutdown();
 147 }
 148
 149 static void machine_hang(void)
 150 {
 151         pr_emerg("System Halted, OK to turn off power\n");
 152         local_irq_disable();
 153         while (1)
 154                 ;
 155 }
 156
 157 void machine_restart(char *cmd)
 158 {
 159         machine_shutdown();
 160         if (ppc_md.restart)
 161                 ppc_md.restart(cmd);
 162
 163         smp_send_stop();
 164
 165         do_kernel_restart(cmd);
 166         mdelay(1000);
 167
 168         machine_hang();
 169 }
 170
 171 void machine_power_off(void)
 172 {
 173         machine_shutdown();
 174         if (pm_power_off)
 175                 pm_power_off();
 176
 177         smp_send_stop();
 178         machine_hang();
 179 }
 180 /* Used by the G5 thermal driver */
 181 EXPORT_SYMBOL_GPL(machine_power_off);
 182
 183 void (*pm_power_off)(void);
 184 EXPORT_SYMBOL_GPL(pm_power_off);
 185
 186 void machine_halt(void)
 187 {
 188         machine_shutdown();
 189         if (ppc_md.halt)
 190                 ppc_md.halt();
 191
 192         smp_send_stop();
 193         machine_hang();
 194 }
 195
 196 #ifdef CONFIG_SMP
 197 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 198 #endif
 199
 200 static void show_cpuinfo_summary(struct seq_file *m)
 201 {
 202         struct device_node *root;
 203         const char *model = NULL;
 204 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 205         unsigned long bogosum = 0;
 206         int i;
 207         for_each_online_cpu(i)
 208                 bogosum += loops_per_jiffy;
 209         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 210                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 211 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 212         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 213         if (ppc_md.name)
 214                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 215         root = of_find_node_by_path("/");
 216         if (root)
 217                 model = of_get_property(root, "model", NULL);
 218         if (model)
 219                 seq_printf(m, "model\t\t: %s\n", model);
 220         of_node_put(root);
 221
 222         if (ppc_md.show_cpuinfo != NULL)
 223                 ppc_md.show_cpuinfo(m);
 224
 225 #ifdef CONFIG_PPC32
 226         /* Display the amount of memory */
 227         seq_printf(m, "Memory\t\t: %d MB\n",
 228                    (unsigned int)(total_memory / (1024 * 1024)));
 229 #endif
 230 }
 231
 232 static int show_cpuinfo(struct seq_file *m, void *v)
 233 {
 234         unsigned long cpu_id = (unsigned long)v - 1;
 235         unsigned int pvr;
 236         unsigned long proc_freq;
 237         unsigned short maj;
 238         unsigned short min;
 239
 240 #ifdef CONFIG_SMP
 241         pvr = per_cpu(cpu_pvr, cpu_id);
 242 #else
 243         pvr = mfspr(SPRN_PVR);
 244 #endif
 245         maj = (pvr >> 8) & 0xFF;
 246         min = pvr & 0xFF;
 247
 248         seq_printf(m, "processor\t: %lu\n", cpu_id);
 249         seq_printf(m, "cpu\t\t: ");
 250
 251         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 252                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 253         else
 254                 seq_printf(m, "unknown (%08x)", pvr);
 255
 256 #ifdef CONFIG_ALTIVEC
 257         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 258                 seq_printf(m, ", altivec supported");
 259 #endif /* CONFIG_ALTIVEC */
 260
 261         seq_printf(m, "\n");
 262
 263 #ifdef CONFIG_TAU
 264         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 265 #ifdef CONFIG_TAU_AVERAGE
 266                 /* more straightforward, but potentially misleading */
 267                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 268                            cpu_temp(cpu_id));
 269 #else
 270                 /* show the actual temp sensor range */
 271                 u32 temp;
 272                 temp = cpu_temp_both(cpu_id);
 273                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 274                            temp & 0xff, temp >> 16);
 275 #endif
 276         }
 277 #endif /* CONFIG_TAU */
 278
 279         /*
 280          * Platforms that have variable clock rates, should implement
 281          * the method ppc_md.get_proc_freq() that reports the clock
 282          * rate of a given cpu. The rest can use ppc_proc_freq to
 283          * report the clock rate that is same across all cpus.
 284          */
 285         if (ppc_md.get_proc_freq)
 286                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 287         else
 288                 proc_freq = ppc_proc_freq;
 289
 290         if (proc_freq)
 291                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 292                            proc_freq / 1000000, proc_freq % 1000000);
 293
 294         if (ppc_md.show_percpuinfo != NULL)
 295                 ppc_md.show_percpuinfo(m, cpu_id);
 296
 297         /* If we are a Freescale core do a simple check so
 298          * we dont have to keep adding cases in the future */
 299         if (PVR_VER(pvr) & 0x8000) {
 300                 switch (PVR_VER(pvr)) {
 301                 case 0x8000:    /* 7441/7450/7451, Voyager */
 302                 case 0x8001:    /* 7445/7455, Apollo 6 */
 303                 case 0x8002:    /* 7447/7457, Apollo 7 */
 304                 case 0x8003:    /* 7447A, Apollo 7 PM */
 305                 case 0x8004:    /* 7448, Apollo 8 */
 306                 case 0x800c:    /* 7410, Nitro */
 307                         maj = ((pvr >> 8) & 0xF);
 308                         min = PVR_MIN(pvr);
 309                         break;
 310                 default:        /* e500/book-e */
 311                         maj = PVR_MAJ(pvr);
 312                         min = PVR_MIN(pvr);
 313                         break;
 314                 }
 315         } else {
 316                 switch (PVR_VER(pvr)) {
 317                         case 0x0020:    /* 403 family */
 318                                 maj = PVR_MAJ(pvr) + 1;
 319                                 min = PVR_MIN(pvr);
 320                                 break;
 321                         case 0x1008:    /* 740P/750P ?? */
 322                                 maj = ((pvr >> 8) & 0xFF) - 1;
 323                                 min = pvr & 0xFF;
 324                                 break;
 325                         case 0x004e: /* POWER9 bits 12-15 give chip type */
 326                                 maj = (pvr >> 8) & 0x0F;
 327                                 min = pvr & 0xFF;
 328                                 break;
 329                         default:
 330                                 maj = (pvr >> 8) & 0xFF;
 331                                 min = pvr & 0xFF;
 332                                 break;
 333                 }
 334         }
 335
 336         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 337                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 338
 339 #ifdef CONFIG_PPC32
 340         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 341                    loops_per_jiffy / (500000/HZ),
 342                    (loops_per_jiffy / (5000/HZ)) % 100);
 343 #endif
 344         seq_printf(m, "\n");
 345
 346         /* If this is the last cpu, print the summary */
 347         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 348                 show_cpuinfo_summary(m);
 349
 350         return 0;
 351 }
 352
 353 static void *c_start(struct seq_file *m, loff_t *pos)
 354 {
 355         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 356                 *pos = cpumask_first(cpu_online_mask);
 357         else
 358                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 359         if ((*pos) < nr_cpu_ids)
 360                 return (void *)(unsigned long)(*pos + 1);
 361         return NULL;
 362 }
 363
 364 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 365 {
 366         (*pos)++;
 367         return c_start(m, pos);
 368 }
 369
 370 static void c_stop(struct seq_file *m, void *v)
 371 {
 372 }
 373
 374 const struct seq_operations cpuinfo_op = {
 375         .start  = c_start,
 376         .next   = c_next,
 377         .stop   = c_stop,
 378         .show   = show_cpuinfo,
 379 };
 380
 381 void __init check_for_initrd(void)
 382 {
 383 #ifdef CONFIG_BLK_DEV_INITRD
 384         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 385             initrd_start, initrd_end);
 386
 387         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 388          * look sensible. If not, clear initrd reference.
 389          */
 390         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 391             initrd_end > initrd_start)
 392                 ROOT_DEV = Root_RAM0;
 393         else
 394                 initrd_start = initrd_end = 0;
 395
 396         if (initrd_start)
 397                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 398
 399         DBG(" <- check_for_initrd()\n");
 400 #endif /* CONFIG_BLK_DEV_INITRD */
 401 }
 402
 403 #ifdef CONFIG_SMP
 404
 405 int threads_per_core, threads_per_subcore, threads_shift;
 406 cpumask_t threads_core_mask;
 407 EXPORT_SYMBOL_GPL(threads_per_core);
 408 EXPORT_SYMBOL_GPL(threads_per_subcore);
 409 EXPORT_SYMBOL_GPL(threads_shift);
 410 EXPORT_SYMBOL_GPL(threads_core_mask);
 411
 412 static void __init cpu_init_thread_core_maps(int tpc)
 413 {
 414         int i;
 415
 416         threads_per_core = tpc;
 417         threads_per_subcore = tpc;
 418         cpumask_clear(&threads_core_mask);
 419
 420         /* This implementation only supports power of 2 number of threads
 421          * for simplicity and performance
 422          */
 423         threads_shift = ilog2(tpc);
 424         BUG_ON(tpc != (1 << threads_shift));
 425
 426         for (i = 0; i < tpc; i++)
 427                 cpumask_set_cpu(i, &threads_core_mask);
 428
 429         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 430                tpc, tpc > 1 ? "s" : "");
 431         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 432 }
 433
 434
 435 u32 *cpu_to_phys_id = NULL;
 436
 437 /**
 438  * setup_cpu_maps - initialize the following cpu maps:
 439  *                  cpu_possible_mask
 440  *                  cpu_present_mask
 441  *
 442  * Having the possible map set up early allows us to restrict allocations
 443  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 444  *
 445  * We do not initialize the online map here; cpus set their own bits in
 446  * cpu_online_mask as they come up.
 447  *
 448  * This function is valid only for Open Firmware systems.  finish_device_tree
 449  * must be called before using this.
 450  *
 451  * While we're here, we may as well set the "physical" cpu ids in the paca.
 452  *
 453  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 454  */
 455 void __init smp_setup_cpu_maps(void)
 456 {
 457         struct device_node *dn;
 458         int cpu = 0;
 459         int nthreads = 1;
 460
 461         DBG("smp_setup_cpu_maps()\n");
 462
 463         cpu_to_phys_id = __va(memblock_phys_alloc(nr_cpu_ids * sizeof(u32), __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          * panic does a local_irq_disable, but we really
 705          * want interrupts to be hard disabled.
 706          */
 707         hard_irq_disable();
 708
 709         /*
 710          * If firmware-assisted dump has been registered then trigger
 711          * firmware-assisted dump and let firmware handle everything else.
 712          */
 713         crash_fadump(NULL, ptr);
 714         if (ppc_md.panic)
 715                 ppc_md.panic(ptr);  /* May not return */
 716         return NOTIFY_DONE;
 717 }
 718
 719 static struct notifier_block ppc_panic_block = {
 720         .notifier_call = ppc_panic_event,
 721         .priority = INT_MIN /* may not return; must be done last */
 722 };
 723
 724 void __init setup_panic(void)
 725 {
 726         /* PPC64 always does a hard irq disable in its panic handler */
 727         if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
 728                 return;
 729         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 730 }
 731
 732 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 733 /*
 734  * For platforms that have configurable cache-coherency.  This function
 735  * checks that the cache coherency setting of the kernel matches the setting
 736  * left by the firmware, as indicated in the device tree.  Since a mismatch
 737  * will eventually result in DMA failures, we print * and error and call
 738  * BUG() in that case.
 739  */
 740
 741 #ifdef CONFIG_NOT_COHERENT_CACHE
 742 #define KERNEL_COHERENCY        0
 743 #else
 744 #define KERNEL_COHERENCY        1
 745 #endif
 746
 747 static int __init check_cache_coherency(void)
 748 {
 749         struct device_node *np;
 750         const void *prop;
 751         int devtree_coherency;
 752
 753         np = of_find_node_by_path("/");
 754         prop = of_get_property(np, "coherency-off", NULL);
 755         of_node_put(np);
 756
 757         devtree_coherency = prop ? 0 : 1;
 758
 759         if (devtree_coherency != KERNEL_COHERENCY) {
 760                 printk(KERN_ERR
 761                         "kernel coherency:%s != device tree_coherency:%s\n",
 762                         KERNEL_COHERENCY ? "on" : "off",
 763                         devtree_coherency ? "on" : "off");
 764                 BUG();
 765         }
 766
 767         return 0;
 768 }
 769
 770 late_initcall(check_cache_coherency);
 771 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 772
 773 #ifdef CONFIG_DEBUG_FS
 774 struct dentry *powerpc_debugfs_root;
 775 EXPORT_SYMBOL(powerpc_debugfs_root);
 776
 777 static int powerpc_debugfs_init(void)
 778 {
 779         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 780
 781         return powerpc_debugfs_root == NULL;
 782 }
 783 arch_initcall(powerpc_debugfs_init);
 784 #endif
 785
 786 void ppc_printk_progress(char *s, unsigned short hex)
 787 {
 788         pr_info("%s\n", s);
 789 }
 790
 791 void arch_setup_pdev_archdata(struct platform_device *pdev)
 792 {
 793         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 794         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 795         set_dma_ops(&pdev->dev, &dma_nommu_ops);
 796 }
 797
 798 static __init void print_system_info(void)
 799 {
 800         pr_info("-----------------------------------------------------\n");
 801 #ifdef CONFIG_PPC_BOOK3S_64
 802         pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
 803 #endif
 804 #ifdef CONFIG_PPC_STD_MMU_32
 805         pr_info("Hash_size         = 0x%lx\n", Hash_size);
 806 #endif
 807         pr_info("phys_mem_size     = 0x%llx\n",
 808                 (unsigned long long)memblock_phys_mem_size());
 809
 810         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 811         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 812         if (ucache_bsize != 0)
 813                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 814
 815         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 816         pr_info("  possible        = 0x%016lx\n",
 817                 (unsigned long)CPU_FTRS_POSSIBLE);
 818         pr_info("  always          = 0x%016lx\n",
 819                 (unsigned long)CPU_FTRS_ALWAYS);
 820         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 821                 cur_cpu_spec->cpu_user_features,
 822                 cur_cpu_spec->cpu_user_features2);
 823         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 824 #ifdef CONFIG_PPC64
 825         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 826 #endif
 827
 828 #ifdef CONFIG_PPC_BOOK3S_64
 829         if (htab_address)
 830                 pr_info("htab_address      = 0x%p\n", htab_address);
 831         if (htab_hash_mask)
 832                 pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
 833 #endif
 834 #ifdef CONFIG_PPC_STD_MMU_32
 835         if (Hash)
 836                 pr_info("Hash              = 0x%p\n", Hash);
 837         if (Hash_mask)
 838                 pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
 839 #endif
 840
 841         if (PHYSICAL_START > 0)
 842                 pr_info("physical_start    = 0x%llx\n",
 843                        (unsigned long long)PHYSICAL_START);
 844         pr_info("-----------------------------------------------------\n");
 845 }
 846
 847 #ifdef CONFIG_SMP
 848 static void smp_setup_pacas(void)
 849 {
 850         int cpu;
 851
 852         for_each_possible_cpu(cpu) {
 853                 if (cpu == smp_processor_id())
 854                         continue;
 855                 allocate_paca(cpu);
 856                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 857         }
 858
 859         memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
 860         cpu_to_phys_id = NULL;
 861 }
 862 #endif
 863
 864 /*
 865  * Called into from start_kernel this initializes memblock, which is used
 866  * to manage page allocation until mem_init is called.
 867  */
 868 void __init setup_arch(char **cmdline_p)
 869 {
 870         *cmdline_p = boot_command_line;
 871
 872         /* Set a half-reasonable default so udelay does something sensible */
 873         loops_per_jiffy = 500000000 / HZ;
 874
 875         /* Unflatten the device-tree passed by prom_init or kexec */
 876         unflatten_device_tree();
 877
 878         /*
 879          * Initialize cache line/block info from device-tree (on ppc64) or
 880          * just cputable (on ppc32).
 881          */
 882         initialize_cache_info();
 883
 884         /* Initialize RTAS if available. */
 885         rtas_initialize();
 886
 887         /* Check if we have an initrd provided via the device-tree. */
 888         check_for_initrd();
 889
 890         /* Probe the machine type, establish ppc_md. */
 891         probe_machine();
 892
 893         /* Setup panic notifier if requested by the platform. */
 894         setup_panic();
 895
 896         /*
 897          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 898          * it from their respective probe() function.
 899          */
 900         setup_power_save();
 901
 902         /* Discover standard serial ports. */
 903         find_legacy_serial_ports();
 904
 905         /* Register early console with the printk subsystem. */
 906         register_early_udbg_console();
 907
 908         /* Setup the various CPU maps based on the device-tree. */
 909         smp_setup_cpu_maps();
 910
 911         /* Initialize xmon. */
 912         xmon_setup();
 913
 914         /* Check the SMT related command line arguments (ppc64). */
 915         check_smt_enabled();
 916
 917         /* Parse memory topology */
 918         mem_topology_setup();
 919
 920         /*
 921          * Release secondary cpus out of their spinloops at 0x60 now that
 922          * we can map physical -> logical CPU ids.
 923          *
 924          * Freescale Book3e parts spin in a loop provided by firmware,
 925          * so smp_release_cpus() does nothing for them.
 926          */
 927 #ifdef CONFIG_SMP
 928         smp_setup_pacas();
 929
 930         /* On BookE, setup per-core TLB data structures. */
 931         setup_tlb_core_data();
 932
 933         smp_release_cpus();
 934 #endif
 935
 936         /* Print various info about the machine that has been gathered so far. */
 937         print_system_info();
 938
 939         /* Reserve large chunks of memory for use by CMA for KVM. */
 940         kvm_cma_reserve();
 941
 942         klp_init_thread_info(&init_thread_info);
 943
 944         init_mm.start_code = (unsigned long)_stext;
 945         init_mm.end_code = (unsigned long) _etext;
 946         init_mm.end_data = (unsigned long) _edata;
 947         init_mm.brk = klimit;
 948
 949 #ifdef CONFIG_PPC_MM_SLICES
 950 #ifdef CONFIG_PPC64
 951         if (!radix_enabled())
 952                 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64;
 953 #elif defined(CONFIG_PPC_8xx)
 954         init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW;
 955 #else
 956 #error  "context.addr_limit not initialized."
 957 #endif
 958 #endif
 959
 960 #ifdef CONFIG_SPAPR_TCE_IOMMU
 961         mm_iommu_init(&init_mm);
 962 #endif
 963         irqstack_early_init();
 964         exc_lvl_early_init();
 965         emergency_stack_init();
 966
 967         initmem_init();
 968
 969         early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
 970
 971 #ifdef CONFIG_DUMMY_CONSOLE
 972         conswitchp = &dummy_con;
 973 #endif
 974         if (ppc_md.setup_arch)
 975                 ppc_md.setup_arch();
 976
 977         setup_barrier_nospec();
 978
 979         paging_init();
 980
 981         /* Initialize the MMU context management stuff. */
 982         mmu_context_init();
 983
 984 #ifdef CONFIG_PPC64
 985         /* Interrupt code needs to be 64K-aligned. */
 986         if ((unsigned long)_stext & 0xffff)
 987                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 988                       (unsigned long)_stext);
 989 #endif
 990 }