arch/powerpc/kernel/setup-common.c

   1 /*
   2  * Common boot and setup code for both 32-bit and 64-bit.
   3  * Extracted from arch/powerpc/kernel/setup_64.c.
   4  *
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #undef DEBUG
  14
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/sched.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/reboot.h>
  21 #include <linux/delay.h>
  22 #include <linux/initrd.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/ioport.h>
  26 #include <linux/console.h>
  27 #include <linux/utsname.h>
  28 #include <linux/screen_info.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/notifier.h>
  31 #include <linux/cpu.h>
  32 #include <linux/unistd.h>
  33 #include <linux/serial.h>
  34 #include <linux/serial_8250.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/percpu.h>
  37 #include <linux/lmb.h>
  38 #include <asm/io.h>
  39 #include <asm/prom.h>
  40 #include <asm/processor.h>
  41 #include <asm/vdso_datapage.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/smp.h>
  44 #include <asm/elf.h>
  45 #include <asm/machdep.h>
  46 #include <asm/time.h>
  47 #include <asm/cputable.h>
  48 #include <asm/sections.h>
  49 #include <asm/firmware.h>
  50 #include <asm/btext.h>
  51 #include <asm/nvram.h>
  52 #include <asm/setup.h>
  53 #include <asm/system.h>
  54 #include <asm/rtas.h>
  55 #include <asm/iommu.h>
  56 #include <asm/serial.h>
  57 #include <asm/cache.h>
  58 #include <asm/page.h>
  59 #include <asm/mmu.h>
  60 #include <asm/xmon.h>
  61 #include <asm/cputhreads.h>
  62
  63 #include "setup.h"
  64
  65 #ifdef DEBUG
  66 #include <asm/udbg.h>
  67 #define DBG(fmt...) udbg_printf(fmt)
  68 #else
  69 #define DBG(fmt...)
  70 #endif
  71
  72 /* The main machine-dep calls structure
  73  */
  74 struct machdep_calls ppc_md;
  75 EXPORT_SYMBOL(ppc_md);
  76 struct machdep_calls *machine_id;
  77 EXPORT_SYMBOL(machine_id);
  78
  79 unsigned long klimit = (unsigned long) _end;
  80
  81 char cmd_line[COMMAND_LINE_SIZE];
  82
  83 /*
  84  * This still seems to be needed... -- paulus
  85  */
  86 struct screen_info screen_info = {
  87         .orig_x = 0,
  88         .orig_y = 25,
  89         .orig_video_cols = 80,
  90         .orig_video_lines = 25,
  91         .orig_video_isVGA = 1,
  92         .orig_video_points = 16
  93 };
  94
  95 #ifdef __DO_IRQ_CANON
  96 /* XXX should go elsewhere eventually */
  97 int ppc_do_canonicalize_irqs;
  98 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  99 #endif
 100
 101 /* also used by kexec */
 102 void machine_shutdown(void)
 103 {
 104         if (ppc_md.machine_shutdown)
 105                 ppc_md.machine_shutdown();
 106 }
 107
 108 void machine_restart(char *cmd)
 109 {
 110         machine_shutdown();
 111         if (ppc_md.restart)
 112                 ppc_md.restart(cmd);
 113 #ifdef CONFIG_SMP
 114         smp_send_stop();
 115 #endif
 116         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 117         local_irq_disable();
 118         while (1) ;
 119 }
 120
 121 void machine_power_off(void)
 122 {
 123         machine_shutdown();
 124         if (ppc_md.power_off)
 125                 ppc_md.power_off();
 126 #ifdef CONFIG_SMP
 127         smp_send_stop();
 128 #endif
 129         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 130         local_irq_disable();
 131         while (1) ;
 132 }
 133 /* Used by the G5 thermal driver */
 134 EXPORT_SYMBOL_GPL(machine_power_off);
 135
 136 void (*pm_power_off)(void) = machine_power_off;
 137 EXPORT_SYMBOL_GPL(pm_power_off);
 138
 139 void machine_halt(void)
 140 {
 141         machine_shutdown();
 142         if (ppc_md.halt)
 143                 ppc_md.halt();
 144 #ifdef CONFIG_SMP
 145         smp_send_stop();
 146 #endif
 147         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 148         local_irq_disable();
 149         while (1) ;
 150 }
 151
 152
 153 #ifdef CONFIG_TAU
 154 extern u32 cpu_temp(unsigned long cpu);
 155 extern u32 cpu_temp_both(unsigned long cpu);
 156 #endif /* CONFIG_TAU */
 157
 158 #ifdef CONFIG_SMP
 159 DEFINE_PER_CPU(unsigned int, pvr);
 160 #endif
 161
 162 static int show_cpuinfo(struct seq_file *m, void *v)
 163 {
 164         unsigned long cpu_id = (unsigned long)v - 1;
 165         unsigned int pvr;
 166         unsigned short maj;
 167         unsigned short min;
 168
 169         if (cpu_id == NR_CPUS) {
 170                 struct device_node *root;
 171                 const char *model = NULL;
 172 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 173                 unsigned long bogosum = 0;
 174                 int i;
 175                 for_each_online_cpu(i)
 176                         bogosum += loops_per_jiffy;
 177                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 178                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 179 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 180                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 181                 if (ppc_md.name)
 182                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 183                 root = of_find_node_by_path("/");
 184                 if (root)
 185                         model = of_get_property(root, "model", NULL);
 186                 if (model)
 187                         seq_printf(m, "model\t\t: %s\n", model);
 188                 of_node_put(root);
 189
 190                 if (ppc_md.show_cpuinfo != NULL)
 191                         ppc_md.show_cpuinfo(m);
 192
 193                 return 0;
 194         }
 195
 196         /* We only show online cpus: disable preempt (overzealous, I
 197          * knew) to prevent cpu going down. */
 198         preempt_disable();
 199         if (!cpu_online(cpu_id)) {
 200                 preempt_enable();
 201                 return 0;
 202         }
 203
 204 #ifdef CONFIG_SMP
 205         pvr = per_cpu(pvr, cpu_id);
 206 #else
 207         pvr = mfspr(SPRN_PVR);
 208 #endif
 209         maj = (pvr >> 8) & 0xFF;
 210         min = pvr & 0xFF;
 211
 212         seq_printf(m, "processor\t: %lu\n", cpu_id);
 213         seq_printf(m, "cpu\t\t: ");
 214
 215         if (cur_cpu_spec->pvr_mask)
 216                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 217         else
 218                 seq_printf(m, "unknown (%08x)", pvr);
 219
 220 #ifdef CONFIG_ALTIVEC
 221         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 222                 seq_printf(m, ", altivec supported");
 223 #endif /* CONFIG_ALTIVEC */
 224
 225         seq_printf(m, "\n");
 226
 227 #ifdef CONFIG_TAU
 228         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 229 #ifdef CONFIG_TAU_AVERAGE
 230                 /* more straightforward, but potentially misleading */
 231                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 232                            cpu_temp(cpu_id));
 233 #else
 234                 /* show the actual temp sensor range */
 235                 u32 temp;
 236                 temp = cpu_temp_both(cpu_id);
 237                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 238                            temp & 0xff, temp >> 16);
 239 #endif
 240         }
 241 #endif /* CONFIG_TAU */
 242
 243         /*
 244          * Assume here that all clock rates are the same in a
 245          * smp system.  -- Cort
 246          */
 247         if (ppc_proc_freq)
 248                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 249                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 250
 251         if (ppc_md.show_percpuinfo != NULL)
 252                 ppc_md.show_percpuinfo(m, cpu_id);
 253
 254         /* If we are a Freescale core do a simple check so
 255          * we dont have to keep adding cases in the future */
 256         if (PVR_VER(pvr) & 0x8000) {
 257                 maj = PVR_MAJ(pvr);
 258                 min = PVR_MIN(pvr);
 259         } else {
 260                 switch (PVR_VER(pvr)) {
 261                         case 0x0020:    /* 403 family */
 262                                 maj = PVR_MAJ(pvr) + 1;
 263                                 min = PVR_MIN(pvr);
 264                                 break;
 265                         case 0x1008:    /* 740P/750P ?? */
 266                                 maj = ((pvr >> 8) & 0xFF) - 1;
 267                                 min = pvr & 0xFF;
 268                                 break;
 269                         default:
 270                                 maj = (pvr >> 8) & 0xFF;
 271                                 min = pvr & 0xFF;
 272                                 break;
 273                 }
 274         }
 275
 276         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 277                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 278
 279 #ifdef CONFIG_PPC32
 280         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 281                    loops_per_jiffy / (500000/HZ),
 282                    (loops_per_jiffy / (5000/HZ)) % 100);
 283 #endif
 284
 285 #ifdef CONFIG_SMP
 286         seq_printf(m, "\n");
 287 #endif
 288
 289         preempt_enable();
 290         return 0;
 291 }
 292
 293 static void *c_start(struct seq_file *m, loff_t *pos)
 294 {
 295         unsigned long i = *pos;
 296
 297         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 298 }
 299
 300 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 301 {
 302         ++*pos;
 303         return c_start(m, pos);
 304 }
 305
 306 static void c_stop(struct seq_file *m, void *v)
 307 {
 308 }
 309
 310 struct seq_operations cpuinfo_op = {
 311         .start =c_start,
 312         .next = c_next,
 313         .stop = c_stop,
 314         .show = show_cpuinfo,
 315 };
 316
 317 void __init check_for_initrd(void)
 318 {
 319 #ifdef CONFIG_BLK_DEV_INITRD
 320         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 321             initrd_start, initrd_end);
 322
 323         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 324          * look sensible. If not, clear initrd reference.
 325          */
 326         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 327             initrd_end > initrd_start)
 328                 ROOT_DEV = Root_RAM0;
 329         else
 330                 initrd_start = initrd_end = 0;
 331
 332         if (initrd_start)
 333                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 334
 335         DBG(" <- check_for_initrd()\n");
 336 #endif /* CONFIG_BLK_DEV_INITRD */
 337 }
 338
 339 #ifdef CONFIG_SMP
 340
 341 int threads_per_core, threads_shift;
 342 cpumask_t threads_core_mask;
 343
 344 static void __init cpu_init_thread_core_maps(int tpc)
 345 {
 346         int i;
 347
 348         threads_per_core = tpc;
 349         threads_core_mask = CPU_MASK_NONE;
 350
 351         /* This implementation only supports power of 2 number of threads
 352          * for simplicity and performance
 353          */
 354         threads_shift = ilog2(tpc);
 355         BUG_ON(tpc != (1 << threads_shift));
 356
 357         for (i = 0; i < tpc; i++)
 358                 cpu_set(i, threads_core_mask);
 359
 360         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 361                tpc, tpc > 1 ? "s" : "");
 362         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 363 }
 364
 365
 366 /**
 367  * setup_cpu_maps - initialize the following cpu maps:
 368  *                  cpu_possible_map
 369  *                  cpu_present_map
 370  *                  cpu_sibling_map
 371  *
 372  * Having the possible map set up early allows us to restrict allocations
 373  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 374  *
 375  * We do not initialize the online map here; cpus set their own bits in
 376  * cpu_online_map as they come up.
 377  *
 378  * This function is valid only for Open Firmware systems.  finish_device_tree
 379  * must be called before using this.
 380  *
 381  * While we're here, we may as well set the "physical" cpu ids in the paca.
 382  *
 383  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 384  */
 385 void __init smp_setup_cpu_maps(void)
 386 {
 387         struct device_node *dn = NULL;
 388         int cpu = 0;
 389         int nthreads = 1;
 390
 391         DBG("smp_setup_cpu_maps()\n");
 392
 393         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 394                 const int *intserv;
 395                 int j, len;
 396
 397                 DBG("  * %s...\n", dn->full_name);
 398
 399                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 400                                 &len);
 401                 if (intserv) {
 402                         nthreads = len / sizeof(int);
 403                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 404                             nthreads);
 405                 } else {
 406                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 407                         intserv = of_get_property(dn, "reg", NULL);
 408                         if (!intserv)
 409                                 intserv = &cpu; /* assume logical == phys */
 410                 }
 411
 412                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 413                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 414                             j, cpu, intserv[j]);
 415                         cpu_set(cpu, cpu_present_map);
 416                         set_hard_smp_processor_id(cpu, intserv[j]);
 417                         cpu_set(cpu, cpu_possible_map);
 418                         cpu++;
 419                 }
 420         }
 421
 422         /* If no SMT supported, nthreads is forced to 1 */
 423         if (!cpu_has_feature(CPU_FTR_SMT)) {
 424                 DBG("  SMT disabled ! nthreads forced to 1\n");
 425                 nthreads = 1;
 426         }
 427
 428 #ifdef CONFIG_PPC64
 429         /*
 430          * On pSeries LPAR, we need to know how many cpus
 431          * could possibly be added to this partition.
 432          */
 433         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 434             (dn = of_find_node_by_path("/rtas"))) {
 435                 int num_addr_cell, num_size_cell, maxcpus;
 436                 const unsigned int *ireg;
 437
 438                 num_addr_cell = of_n_addr_cells(dn);
 439                 num_size_cell = of_n_size_cells(dn);
 440
 441                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 442
 443                 if (!ireg)
 444                         goto out;
 445
 446                 maxcpus = ireg[num_addr_cell + num_size_cell];
 447
 448                 /* Double maxcpus for processors which have SMT capability */
 449                 if (cpu_has_feature(CPU_FTR_SMT))
 450                         maxcpus *= nthreads;
 451
 452                 if (maxcpus > NR_CPUS) {
 453                         printk(KERN_WARNING
 454                                "Partition configured for %d cpus, "
 455                                "operating system maximum is %d.\n",
 456                                maxcpus, NR_CPUS);
 457                         maxcpus = NR_CPUS;
 458                 } else
 459                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 460                                maxcpus);
 461
 462                 for (cpu = 0; cpu < maxcpus; cpu++)
 463                         cpu_set(cpu, cpu_possible_map);
 464         out:
 465                 of_node_put(dn);
 466         }
 467         vdso_data->processorCount = num_present_cpus();
 468 #endif /* CONFIG_PPC64 */
 469
 470         /* Initialize CPU <=> thread mapping/
 471          *
 472          * WARNING: We assume that the number of threads is the same for
 473          * every CPU in the system. If that is not the case, then some code
 474          * here will have to be reworked
 475          */
 476         cpu_init_thread_core_maps(nthreads);
 477 }
 478
 479 /*
 480  * Being that cpu_sibling_map is now a per_cpu array, then it cannot
 481  * be initialized until the per_cpu areas have been created.  This
 482  * function is now called from setup_per_cpu_areas().
 483  */
 484 void __init smp_setup_cpu_sibling_map(void)
 485 {
 486 #ifdef CONFIG_PPC64
 487         int i, cpu, base;
 488
 489         for_each_possible_cpu(cpu) {
 490                 DBG("Sibling map for CPU %d:", cpu);
 491                 base = cpu_first_thread_in_core(cpu);
 492                 for (i = 0; i < threads_per_core; i++) {
 493                         cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
 494                         DBG(" %d", base + i);
 495                 }
 496                 DBG("\n");
 497         }
 498
 499 #endif /* CONFIG_PPC64 */
 500 }
 501 #endif /* CONFIG_SMP */
 502
 503 #ifdef CONFIG_PCSPKR_PLATFORM
 504 static __init int add_pcspkr(void)
 505 {
 506         struct device_node *np;
 507         struct platform_device *pd;
 508         int ret;
 509
 510         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 511         of_node_put(np);
 512         if (!np)
 513                 return -ENODEV;
 514
 515         pd = platform_device_alloc("pcspkr", -1);
 516         if (!pd)
 517                 return -ENOMEM;
 518
 519         ret = platform_device_add(pd);
 520         if (ret)
 521                 platform_device_put(pd);
 522
 523         return ret;
 524 }
 525 device_initcall(add_pcspkr);
 526 #endif  /* CONFIG_PCSPKR_PLATFORM */
 527
 528 void probe_machine(void)
 529 {
 530         extern struct machdep_calls __machine_desc_start;
 531         extern struct machdep_calls __machine_desc_end;
 532
 533         /*
 534          * Iterate all ppc_md structures until we find the proper
 535          * one for the current machine type
 536          */
 537         DBG("Probing machine type ...\n");
 538
 539         for (machine_id = &__machine_desc_start;
 540              machine_id < &__machine_desc_end;
 541              machine_id++) {
 542                 DBG("  %s ...", machine_id->name);
 543                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 544                 if (ppc_md.probe()) {
 545                         DBG(" match !\n");
 546                         break;
 547                 }
 548                 DBG("\n");
 549         }
 550         /* What can we do if we didn't find ? */
 551         if (machine_id >= &__machine_desc_end) {
 552                 DBG("No suitable machine found !\n");
 553                 for (;;);
 554         }
 555
 556         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 557 }
 558
 559 /* Match a class of boards, not a specific device configuration. */
 560 int check_legacy_ioport(unsigned long base_port)
 561 {
 562         struct device_node *parent, *np = NULL;
 563         int ret = -ENODEV;
 564
 565         switch(base_port) {
 566         case I8042_DATA_REG:
 567                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 568                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 569                 if (np) {
 570                         parent = of_get_parent(np);
 571                         of_node_put(np);
 572                         np = parent;
 573                         break;
 574                 }
 575                 np = of_find_node_by_type(NULL, "8042");
 576                 /* Pegasos has no device_type on its 8042 node, look for the
 577                  * name instead */
 578                 if (!np)
 579                         np = of_find_node_by_name(NULL, "8042");
 580                 break;
 581         case FDC_BASE: /* FDC1 */
 582                 np = of_find_node_by_type(NULL, "fdc");
 583                 break;
 584 #ifdef CONFIG_PPC_PREP
 585         case _PIDXR:
 586         case _PNPWRP:
 587         case PNPBIOS_BASE:
 588                 /* implement me */
 589 #endif
 590         default:
 591                 /* ipmi is supposed to fail here */
 592                 break;
 593         }
 594         if (!np)
 595                 return ret;
 596         parent = of_get_parent(np);
 597         if (parent) {
 598                 if (strcmp(parent->type, "isa") == 0)
 599                         ret = 0;
 600                 of_node_put(parent);
 601         }
 602         of_node_put(np);
 603         return ret;
 604 }
 605 EXPORT_SYMBOL(check_legacy_ioport);
 606
 607 static int ppc_panic_event(struct notifier_block *this,
 608                              unsigned long event, void *ptr)
 609 {
 610         ppc_md.panic(ptr);  /* May not return */
 611         return NOTIFY_DONE;
 612 }
 613
 614 static struct notifier_block ppc_panic_block = {
 615         .notifier_call = ppc_panic_event,
 616         .priority = INT_MIN /* may not return; must be done last */
 617 };
 618
 619 void __init setup_panic(void)
 620 {
 621         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 622 }
 623
 624 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 625 /*
 626  * For platforms that have configurable cache-coherency.  This function
 627  * checks that the cache coherency setting of the kernel matches the setting
 628  * left by the firmware, as indicated in the device tree.  Since a mismatch
 629  * will eventually result in DMA failures, we print * and error and call
 630  * BUG() in that case.
 631  */
 632
 633 #ifdef CONFIG_NOT_COHERENT_CACHE
 634 #define KERNEL_COHERENCY        0
 635 #else
 636 #define KERNEL_COHERENCY        1
 637 #endif
 638
 639 static int __init check_cache_coherency(void)
 640 {
 641         struct device_node *np;
 642         const void *prop;
 643         int devtree_coherency;
 644
 645         np = of_find_node_by_path("/");
 646         prop = of_get_property(np, "coherency-off", NULL);
 647         of_node_put(np);
 648
 649         devtree_coherency = prop ? 0 : 1;
 650
 651         if (devtree_coherency != KERNEL_COHERENCY) {
 652                 printk(KERN_ERR
 653                         "kernel coherency:%s != device tree_coherency:%s\n",
 654                         KERNEL_COHERENCY ? "on" : "off",
 655                         devtree_coherency ? "on" : "off");
 656                 BUG();
 657         }
 658
 659         return 0;
 660 }
 661
 662 late_initcall(check_cache_coherency);
 663 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 664
 665 #ifdef CONFIG_DEBUG_FS
 666 struct dentry *powerpc_debugfs_root;
 667
 668 static int powerpc_debugfs_init(void)
 669 {
 670         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 671
 672         return powerpc_debugfs_root == NULL;
 673 }
 674 arch_initcall(powerpc_debugfs_init);
 675 #endif