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/debugfs.h>
  35 #include <linux/percpu.h>
  36 #include <linux/memblock.h>
  37 #include <linux/of_platform.h>
  38 #include <linux/hugetlb.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 unsigned long klimit = (unsigned long) _end;
  91
  92 /*
  93  * This still seems to be needed... -- paulus
  94  */
  95 struct screen_info screen_info = {
  96         .orig_x = 0,
  97         .orig_y = 25,
  98         .orig_video_cols = 80,
  99         .orig_video_lines = 25,
 100         .orig_video_isVGA = 1,
 101         .orig_video_points = 16
 102 };
 103 #if defined(CONFIG_FB_VGA16_MODULE)
 104 EXPORT_SYMBOL(screen_info);
 105 #endif
 106
 107 /* Variables required to store legacy IO irq routing */
 108 int of_i8042_kbd_irq;
 109 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 110 int of_i8042_aux_irq;
 111 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 112
 113 #ifdef __DO_IRQ_CANON
 114 /* XXX should go elsewhere eventually */
 115 int ppc_do_canonicalize_irqs;
 116 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 117 #endif
 118
 119 /* also used by kexec */
 120 void machine_shutdown(void)
 121 {
 122 #ifdef CONFIG_FA_DUMP
 123         /*
 124          * if fadump is active, cleanup the fadump registration before we
 125          * shutdown.
 126          */
 127         fadump_cleanup();
 128 #endif
 129
 130         if (ppc_md.machine_shutdown)
 131                 ppc_md.machine_shutdown();
 132 }
 133
 134 static void machine_hang(void)
 135 {
 136         pr_emerg("System Halted, OK to turn off power\n");
 137         local_irq_disable();
 138         while (1)
 139                 ;
 140 }
 141
 142 void machine_restart(char *cmd)
 143 {
 144         machine_shutdown();
 145         if (ppc_md.restart)
 146                 ppc_md.restart(cmd);
 147
 148         smp_send_stop();
 149
 150         do_kernel_restart(cmd);
 151         mdelay(1000);
 152
 153         machine_hang();
 154 }
 155
 156 void machine_power_off(void)
 157 {
 158         machine_shutdown();
 159         if (pm_power_off)
 160                 pm_power_off();
 161
 162         smp_send_stop();
 163         machine_hang();
 164 }
 165 /* Used by the G5 thermal driver */
 166 EXPORT_SYMBOL_GPL(machine_power_off);
 167
 168 void (*pm_power_off)(void);
 169 EXPORT_SYMBOL_GPL(pm_power_off);
 170
 171 void machine_halt(void)
 172 {
 173         machine_shutdown();
 174         if (ppc_md.halt)
 175                 ppc_md.halt();
 176
 177         smp_send_stop();
 178         machine_hang();
 179 }
 180
 181
 182 #ifdef CONFIG_TAU
 183 extern u32 cpu_temp(unsigned long cpu);
 184 extern u32 cpu_temp_both(unsigned long cpu);
 185 #endif /* CONFIG_TAU */
 186
 187 #ifdef CONFIG_SMP
 188 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 189 #endif
 190
 191 static void show_cpuinfo_summary(struct seq_file *m)
 192 {
 193         struct device_node *root;
 194         const char *model = NULL;
 195 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 196         unsigned long bogosum = 0;
 197         int i;
 198         for_each_online_cpu(i)
 199                 bogosum += loops_per_jiffy;
 200         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 201                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 202 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 203         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 204         if (ppc_md.name)
 205                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 206         root = of_find_node_by_path("/");
 207         if (root)
 208                 model = of_get_property(root, "model", NULL);
 209         if (model)
 210                 seq_printf(m, "model\t\t: %s\n", model);
 211         of_node_put(root);
 212
 213         if (ppc_md.show_cpuinfo != NULL)
 214                 ppc_md.show_cpuinfo(m);
 215
 216 #ifdef CONFIG_PPC32
 217         /* Display the amount of memory */
 218         seq_printf(m, "Memory\t\t: %d MB\n",
 219                    (unsigned int)(total_memory / (1024 * 1024)));
 220 #endif
 221 }
 222
 223 static int show_cpuinfo(struct seq_file *m, void *v)
 224 {
 225         unsigned long cpu_id = (unsigned long)v - 1;
 226         unsigned int pvr;
 227         unsigned long proc_freq;
 228         unsigned short maj;
 229         unsigned short min;
 230
 231 #ifdef CONFIG_SMP
 232         pvr = per_cpu(cpu_pvr, cpu_id);
 233 #else
 234         pvr = mfspr(SPRN_PVR);
 235 #endif
 236         maj = (pvr >> 8) & 0xFF;
 237         min = pvr & 0xFF;
 238
 239         seq_printf(m, "processor\t: %lu\n", cpu_id);
 240         seq_printf(m, "cpu\t\t: ");
 241
 242         if (cur_cpu_spec->pvr_mask)
 243                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 244         else
 245                 seq_printf(m, "unknown (%08x)", pvr);
 246
 247 #ifdef CONFIG_ALTIVEC
 248         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 249                 seq_printf(m, ", altivec supported");
 250 #endif /* CONFIG_ALTIVEC */
 251
 252         seq_printf(m, "\n");
 253
 254 #ifdef CONFIG_TAU
 255         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 256 #ifdef CONFIG_TAU_AVERAGE
 257                 /* more straightforward, but potentially misleading */
 258                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 259                            cpu_temp(cpu_id));
 260 #else
 261                 /* show the actual temp sensor range */
 262                 u32 temp;
 263                 temp = cpu_temp_both(cpu_id);
 264                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 265                            temp & 0xff, temp >> 16);
 266 #endif
 267         }
 268 #endif /* CONFIG_TAU */
 269
 270         /*
 271          * Platforms that have variable clock rates, should implement
 272          * the method ppc_md.get_proc_freq() that reports the clock
 273          * rate of a given cpu. The rest can use ppc_proc_freq to
 274          * report the clock rate that is same across all cpus.
 275          */
 276         if (ppc_md.get_proc_freq)
 277                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 278         else
 279                 proc_freq = ppc_proc_freq;
 280
 281         if (proc_freq)
 282                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 283                            proc_freq / 1000000, proc_freq % 1000000);
 284
 285         if (ppc_md.show_percpuinfo != NULL)
 286                 ppc_md.show_percpuinfo(m, cpu_id);
 287
 288         /* If we are a Freescale core do a simple check so
 289          * we dont have to keep adding cases in the future */
 290         if (PVR_VER(pvr) & 0x8000) {
 291                 switch (PVR_VER(pvr)) {
 292                 case 0x8000:    /* 7441/7450/7451, Voyager */
 293                 case 0x8001:    /* 7445/7455, Apollo 6 */
 294                 case 0x8002:    /* 7447/7457, Apollo 7 */
 295                 case 0x8003:    /* 7447A, Apollo 7 PM */
 296                 case 0x8004:    /* 7448, Apollo 8 */
 297                 case 0x800c:    /* 7410, Nitro */
 298                         maj = ((pvr >> 8) & 0xF);
 299                         min = PVR_MIN(pvr);
 300                         break;
 301                 default:        /* e500/book-e */
 302                         maj = PVR_MAJ(pvr);
 303                         min = PVR_MIN(pvr);
 304                         break;
 305                 }
 306         } else {
 307                 switch (PVR_VER(pvr)) {
 308                         case 0x0020:    /* 403 family */
 309                                 maj = PVR_MAJ(pvr) + 1;
 310                                 min = PVR_MIN(pvr);
 311                                 break;
 312                         case 0x1008:    /* 740P/750P ?? */
 313                                 maj = ((pvr >> 8) & 0xFF) - 1;
 314                                 min = pvr & 0xFF;
 315                                 break;
 316                         default:
 317                                 maj = (pvr >> 8) & 0xFF;
 318                                 min = pvr & 0xFF;
 319                                 break;
 320                 }
 321         }
 322
 323         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 324                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 325
 326 #ifdef CONFIG_PPC32
 327         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 328                    loops_per_jiffy / (500000/HZ),
 329                    (loops_per_jiffy / (5000/HZ)) % 100);
 330 #endif
 331
 332 #ifdef CONFIG_SMP
 333         seq_printf(m, "\n");
 334 #endif
 335         /* If this is the last cpu, print the summary */
 336         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 337                 show_cpuinfo_summary(m);
 338
 339         return 0;
 340 }
 341
 342 static void *c_start(struct seq_file *m, loff_t *pos)
 343 {
 344         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 345                 *pos = cpumask_first(cpu_online_mask);
 346         else
 347                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 348         if ((*pos) < nr_cpu_ids)
 349                 return (void *)(unsigned long)(*pos + 1);
 350         return NULL;
 351 }
 352
 353 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 354 {
 355         (*pos)++;
 356         return c_start(m, pos);
 357 }
 358
 359 static void c_stop(struct seq_file *m, void *v)
 360 {
 361 }
 362
 363 const struct seq_operations cpuinfo_op = {
 364         .start =c_start,
 365         .next = c_next,
 366         .stop = c_stop,
 367         .show = show_cpuinfo,
 368 };
 369
 370 void __init check_for_initrd(void)
 371 {
 372 #ifdef CONFIG_BLK_DEV_INITRD
 373         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 374             initrd_start, initrd_end);
 375
 376         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 377          * look sensible. If not, clear initrd reference.
 378          */
 379         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 380             initrd_end > initrd_start)
 381                 ROOT_DEV = Root_RAM0;
 382         else
 383                 initrd_start = initrd_end = 0;
 384
 385         if (initrd_start)
 386                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 387
 388         DBG(" <- check_for_initrd()\n");
 389 #endif /* CONFIG_BLK_DEV_INITRD */
 390 }
 391
 392 #ifdef CONFIG_SMP
 393
 394 int threads_per_core, threads_per_subcore, threads_shift;
 395 cpumask_t threads_core_mask;
 396 EXPORT_SYMBOL_GPL(threads_per_core);
 397 EXPORT_SYMBOL_GPL(threads_per_subcore);
 398 EXPORT_SYMBOL_GPL(threads_shift);
 399 EXPORT_SYMBOL_GPL(threads_core_mask);
 400
 401 static void __init cpu_init_thread_core_maps(int tpc)
 402 {
 403         int i;
 404
 405         threads_per_core = tpc;
 406         threads_per_subcore = tpc;
 407         cpumask_clear(&threads_core_mask);
 408
 409         /* This implementation only supports power of 2 number of threads
 410          * for simplicity and performance
 411          */
 412         threads_shift = ilog2(tpc);
 413         BUG_ON(tpc != (1 << threads_shift));
 414
 415         for (i = 0; i < tpc; i++)
 416                 cpumask_set_cpu(i, &threads_core_mask);
 417
 418         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 419                tpc, tpc > 1 ? "s" : "");
 420         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 421 }
 422
 423
 424 /**
 425  * setup_cpu_maps - initialize the following cpu maps:
 426  *                  cpu_possible_mask
 427  *                  cpu_present_mask
 428  *
 429  * Having the possible map set up early allows us to restrict allocations
 430  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 431  *
 432  * We do not initialize the online map here; cpus set their own bits in
 433  * cpu_online_mask as they come up.
 434  *
 435  * This function is valid only for Open Firmware systems.  finish_device_tree
 436  * must be called before using this.
 437  *
 438  * While we're here, we may as well set the "physical" cpu ids in the paca.
 439  *
 440  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 441  */
 442 void __init smp_setup_cpu_maps(void)
 443 {
 444         struct device_node *dn = NULL;
 445         int cpu = 0;
 446         int nthreads = 1;
 447
 448         DBG("smp_setup_cpu_maps()\n");
 449
 450         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
 451                 const __be32 *intserv;
 452                 __be32 cpu_be;
 453                 int j, len;
 454
 455                 DBG("  * %s...\n", dn->full_name);
 456
 457                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 458                                 &len);
 459                 if (intserv) {
 460                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 461                             nthreads);
 462                 } else {
 463                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 464                         intserv = of_get_property(dn, "reg", &len);
 465                         if (!intserv) {
 466                                 cpu_be = cpu_to_be32(cpu);
 467                                 intserv = &cpu_be;      /* assume logical == phys */
 468                                 len = 4;
 469                         }
 470                 }
 471
 472                 nthreads = len / sizeof(int);
 473
 474                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 475                         bool avail;
 476
 477                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 478                             j, cpu, be32_to_cpu(intserv[j]));
 479
 480                         avail = of_device_is_available(dn);
 481                         if (!avail)
 482                                 avail = !of_property_match_string(dn,
 483                                                 "enable-method", "spin-table");
 484
 485                         set_cpu_present(cpu, avail);
 486                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
 487                         set_cpu_possible(cpu, true);
 488                         cpu++;
 489                 }
 490         }
 491
 492         /* If no SMT supported, nthreads is forced to 1 */
 493         if (!cpu_has_feature(CPU_FTR_SMT)) {
 494                 DBG("  SMT disabled ! nthreads forced to 1\n");
 495                 nthreads = 1;
 496         }
 497
 498 #ifdef CONFIG_PPC64
 499         /*
 500          * On pSeries LPAR, we need to know how many cpus
 501          * could possibly be added to this partition.
 502          */
 503         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 504             (dn = of_find_node_by_path("/rtas"))) {
 505                 int num_addr_cell, num_size_cell, maxcpus;
 506                 const __be32 *ireg;
 507
 508                 num_addr_cell = of_n_addr_cells(dn);
 509                 num_size_cell = of_n_size_cells(dn);
 510
 511                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 512
 513                 if (!ireg)
 514                         goto out;
 515
 516                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 517
 518                 /* Double maxcpus for processors which have SMT capability */
 519                 if (cpu_has_feature(CPU_FTR_SMT))
 520                         maxcpus *= nthreads;
 521
 522                 if (maxcpus > nr_cpu_ids) {
 523                         printk(KERN_WARNING
 524                                "Partition configured for %d cpus, "
 525                                "operating system maximum is %d.\n",
 526                                maxcpus, nr_cpu_ids);
 527                         maxcpus = nr_cpu_ids;
 528                 } else
 529                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 530                                maxcpus);
 531
 532                 for (cpu = 0; cpu < maxcpus; cpu++)
 533                         set_cpu_possible(cpu, true);
 534         out:
 535                 of_node_put(dn);
 536         }
 537         vdso_data->processorCount = num_present_cpus();
 538 #endif /* CONFIG_PPC64 */
 539
 540         /* Initialize CPU <=> thread mapping/
 541          *
 542          * WARNING: We assume that the number of threads is the same for
 543          * every CPU in the system. If that is not the case, then some code
 544          * here will have to be reworked
 545          */
 546         cpu_init_thread_core_maps(nthreads);
 547
 548         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 549         setup_nr_cpu_ids();
 550
 551         free_unused_pacas();
 552 }
 553 #endif /* CONFIG_SMP */
 554
 555 #ifdef CONFIG_PCSPKR_PLATFORM
 556 static __init int add_pcspkr(void)
 557 {
 558         struct device_node *np;
 559         struct platform_device *pd;
 560         int ret;
 561
 562         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 563         of_node_put(np);
 564         if (!np)
 565                 return -ENODEV;
 566
 567         pd = platform_device_alloc("pcspkr", -1);
 568         if (!pd)
 569                 return -ENOMEM;
 570
 571         ret = platform_device_add(pd);
 572         if (ret)
 573                 platform_device_put(pd);
 574
 575         return ret;
 576 }
 577 device_initcall(add_pcspkr);
 578 #endif  /* CONFIG_PCSPKR_PLATFORM */
 579
 580 void probe_machine(void)
 581 {
 582         extern struct machdep_calls __machine_desc_start;
 583         extern struct machdep_calls __machine_desc_end;
 584         unsigned int i;
 585
 586         /*
 587          * Iterate all ppc_md structures until we find the proper
 588          * one for the current machine type
 589          */
 590         DBG("Probing machine type ...\n");
 591
 592         /*
 593          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 594          * entry before probe_machine() which will be overwritten
 595          */
 596         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 597                 if (((void **)&ppc_md)[i]) {
 598                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 599                                " machine probe !\n", i);
 600                 }
 601         }
 602
 603         for (machine_id = &__machine_desc_start;
 604              machine_id < &__machine_desc_end;
 605              machine_id++) {
 606                 DBG("  %s ...", machine_id->name);
 607                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 608                 if (ppc_md.probe()) {
 609                         DBG(" match !\n");
 610                         break;
 611                 }
 612                 DBG("\n");
 613         }
 614         /* What can we do if we didn't find ? */
 615         if (machine_id >= &__machine_desc_end) {
 616                 DBG("No suitable machine found !\n");
 617                 for (;;);
 618         }
 619
 620         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 621 }
 622
 623 /* Match a class of boards, not a specific device configuration. */
 624 int check_legacy_ioport(unsigned long base_port)
 625 {
 626         struct device_node *parent, *np = NULL;
 627         int ret = -ENODEV;
 628
 629         switch(base_port) {
 630         case I8042_DATA_REG:
 631                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 632                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 633                 if (np) {
 634                         parent = of_get_parent(np);
 635
 636                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 637                         if (!of_i8042_kbd_irq)
 638                                 of_i8042_kbd_irq = 1;
 639
 640                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 641                         if (!of_i8042_aux_irq)
 642                                 of_i8042_aux_irq = 12;
 643
 644                         of_node_put(np);
 645                         np = parent;
 646                         break;
 647                 }
 648                 np = of_find_node_by_type(NULL, "8042");
 649                 /* Pegasos has no device_type on its 8042 node, look for the
 650                  * name instead */
 651                 if (!np)
 652                         np = of_find_node_by_name(NULL, "8042");
 653                 if (np) {
 654                         of_i8042_kbd_irq = 1;
 655                         of_i8042_aux_irq = 12;
 656                 }
 657                 break;
 658         case FDC_BASE: /* FDC1 */
 659                 np = of_find_node_by_type(NULL, "fdc");
 660                 break;
 661         default:
 662                 /* ipmi is supposed to fail here */
 663                 break;
 664         }
 665         if (!np)
 666                 return ret;
 667         parent = of_get_parent(np);
 668         if (parent) {
 669                 if (strcmp(parent->type, "isa") == 0)
 670                         ret = 0;
 671                 of_node_put(parent);
 672         }
 673         of_node_put(np);
 674         return ret;
 675 }
 676 EXPORT_SYMBOL(check_legacy_ioport);
 677
 678 static int ppc_panic_event(struct notifier_block *this,
 679                              unsigned long event, void *ptr)
 680 {
 681         /*
 682          * If firmware-assisted dump has been registered then trigger
 683          * firmware-assisted dump and let firmware handle everything else.
 684          */
 685         crash_fadump(NULL, ptr);
 686         ppc_md.panic(ptr);  /* May not return */
 687         return NOTIFY_DONE;
 688 }
 689
 690 static struct notifier_block ppc_panic_block = {
 691         .notifier_call = ppc_panic_event,
 692         .priority = INT_MIN /* may not return; must be done last */
 693 };
 694
 695 void __init setup_panic(void)
 696 {
 697         if (!ppc_md.panic)
 698                 return;
 699         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 700 }
 701
 702 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 703 /*
 704  * For platforms that have configurable cache-coherency.  This function
 705  * checks that the cache coherency setting of the kernel matches the setting
 706  * left by the firmware, as indicated in the device tree.  Since a mismatch
 707  * will eventually result in DMA failures, we print * and error and call
 708  * BUG() in that case.
 709  */
 710
 711 #ifdef CONFIG_NOT_COHERENT_CACHE
 712 #define KERNEL_COHERENCY        0
 713 #else
 714 #define KERNEL_COHERENCY        1
 715 #endif
 716
 717 static int __init check_cache_coherency(void)
 718 {
 719         struct device_node *np;
 720         const void *prop;
 721         int devtree_coherency;
 722
 723         np = of_find_node_by_path("/");
 724         prop = of_get_property(np, "coherency-off", NULL);
 725         of_node_put(np);
 726
 727         devtree_coherency = prop ? 0 : 1;
 728
 729         if (devtree_coherency != KERNEL_COHERENCY) {
 730                 printk(KERN_ERR
 731                         "kernel coherency:%s != device tree_coherency:%s\n",
 732                         KERNEL_COHERENCY ? "on" : "off",
 733                         devtree_coherency ? "on" : "off");
 734                 BUG();
 735         }
 736
 737         return 0;
 738 }
 739
 740 late_initcall(check_cache_coherency);
 741 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 742
 743 #ifdef CONFIG_DEBUG_FS
 744 struct dentry *powerpc_debugfs_root;
 745 EXPORT_SYMBOL(powerpc_debugfs_root);
 746
 747 static int powerpc_debugfs_init(void)
 748 {
 749         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 750
 751         return powerpc_debugfs_root == NULL;
 752 }
 753 arch_initcall(powerpc_debugfs_init);
 754 #endif
 755
 756 void ppc_printk_progress(char *s, unsigned short hex)
 757 {
 758         pr_info("%s\n", s);
 759 }
 760
 761 void arch_setup_pdev_archdata(struct platform_device *pdev)
 762 {
 763         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 764         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 765         set_dma_ops(&pdev->dev, &dma_direct_ops);
 766 }
 767
 768 static __init void print_system_info(void)
 769 {
 770         pr_info("-----------------------------------------------------\n");
 771 #ifdef CONFIG_PPC_STD_MMU_64
 772         pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
 773 #endif
 774 #ifdef CONFIG_PPC_STD_MMU_32
 775         pr_info("Hash_size         = 0x%lx\n", Hash_size);
 776 #endif
 777         pr_info("phys_mem_size     = 0x%llx\n",
 778                 (unsigned long long)memblock_phys_mem_size());
 779
 780         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 781         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 782         if (ucache_bsize != 0)
 783                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 784
 785         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 786         pr_info("  possible        = 0x%016lx\n",
 787                 (unsigned long)CPU_FTRS_POSSIBLE);
 788         pr_info("  always          = 0x%016lx\n",
 789                 (unsigned long)CPU_FTRS_ALWAYS);
 790         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 791                 cur_cpu_spec->cpu_user_features,
 792                 cur_cpu_spec->cpu_user_features2);
 793         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 794 #ifdef CONFIG_PPC64
 795         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 796 #endif
 797
 798 #ifdef CONFIG_PPC_STD_MMU_64
 799         if (htab_address)
 800                 pr_info("htab_address      = 0x%p\n", htab_address);
 801         if (htab_hash_mask)
 802                 pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
 803 #endif
 804 #ifdef CONFIG_PPC_STD_MMU_32
 805         if (Hash)
 806                 pr_info("Hash              = 0x%p\n", Hash);
 807         if (Hash_mask)
 808                 pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
 809 #endif
 810
 811         if (PHYSICAL_START > 0)
 812                 pr_info("physical_start    = 0x%llx\n",
 813                        (unsigned long long)PHYSICAL_START);
 814         pr_info("-----------------------------------------------------\n");
 815 }
 816
 817 /*
 818  * Called into from start_kernel this initializes memblock, which is used
 819  * to manage page allocation until mem_init is called.
 820  */
 821 void __init setup_arch(char **cmdline_p)
 822 {
 823         *cmdline_p = boot_command_line;
 824
 825         /* Set a half-reasonable default so udelay does something sensible */
 826         loops_per_jiffy = 500000000 / HZ;
 827
 828         /* Unflatten the device-tree passed by prom_init or kexec */
 829         unflatten_device_tree();
 830
 831         /*
 832          * Initialize cache line/block info from device-tree (on ppc64) or
 833          * just cputable (on ppc32).
 834          */
 835         initialize_cache_info();
 836
 837         /* Initialize RTAS if available. */
 838         rtas_initialize();
 839
 840         /* Check if we have an initrd provided via the device-tree. */
 841         check_for_initrd();
 842
 843         /* Probe the machine type, establish ppc_md. */
 844         probe_machine();
 845
 846         /* Setup panic notifier if requested by the platform. */
 847         setup_panic();
 848
 849         /*
 850          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 851          * it from their respective probe() function.
 852          */
 853         setup_power_save();
 854
 855         /* Discover standard serial ports. */
 856         find_legacy_serial_ports();
 857
 858         /* Register early console with the printk subsystem. */
 859         register_early_udbg_console();
 860
 861         /* Setup the various CPU maps based on the device-tree. */
 862         smp_setup_cpu_maps();
 863
 864         /* Initialize xmon. */
 865         xmon_setup();
 866
 867         /* Check the SMT related command line arguments (ppc64). */
 868         check_smt_enabled();
 869
 870         /* On BookE, setup per-core TLB data structures. */
 871         setup_tlb_core_data();
 872
 873         /*
 874          * Release secondary cpus out of their spinloops at 0x60 now that
 875          * we can map physical -> logical CPU ids.
 876          *
 877          * Freescale Book3e parts spin in a loop provided by firmware,
 878          * so smp_release_cpus() does nothing for them.
 879          */
 880 #ifdef CONFIG_SMP
 881         smp_release_cpus();
 882 #endif
 883
 884         /* Print various info about the machine that has been gathered so far. */
 885         print_system_info();
 886
 887         /* Reserve large chunks of memory for use by CMA for KVM. */
 888         kvm_cma_reserve();
 889
 890         /*
 891          * Reserve any gigantic pages requested on the command line.
 892          * memblock needs to have been initialized by the time this is
 893          * called since this will reserve memory.
 894          */
 895         reserve_hugetlb_gpages();
 896
 897         klp_init_thread_info(&init_thread_info);
 898
 899         init_mm.start_code = (unsigned long)_stext;
 900         init_mm.end_code = (unsigned long) _etext;
 901         init_mm.end_data = (unsigned long) _edata;
 902         init_mm.brk = klimit;
 903 #ifdef CONFIG_PPC_64K_PAGES
 904         init_mm.context.pte_frag = NULL;
 905 #endif
 906 #ifdef CONFIG_SPAPR_TCE_IOMMU
 907         mm_iommu_init(&init_mm);
 908 #endif
 909         irqstack_early_init();
 910         exc_lvl_early_init();
 911         emergency_stack_init();
 912
 913         initmem_init();
 914
 915 #ifdef CONFIG_DUMMY_CONSOLE
 916         conswitchp = &dummy_con;
 917 #endif
 918         if (ppc_md.setup_arch)
 919                 ppc_md.setup_arch();
 920
 921         setup_barrier_nospec();
 922         setup_spectre_v2();
 923
 924         paging_init();
 925
 926         /* Initialize the MMU context management stuff. */
 927         mmu_context_init();
 928
 929 #ifdef CONFIG_PPC64
 930         /* Interrupt code needs to be 64K-aligned. */
 931         if ((unsigned long)_stext & 0xffff)
 932                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 933                       (unsigned long)_stext);
 934 #endif
 935 }