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 <asm/io.h>
  38 #include <asm/prom.h>
  39 #include <asm/processor.h>
  40 #include <asm/vdso_datapage.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/smp.h>
  43 #include <asm/elf.h>
  44 #include <asm/machdep.h>
  45 #include <asm/time.h>
  46 #include <asm/cputable.h>
  47 #include <asm/sections.h>
  48 #include <asm/firmware.h>
  49 #include <asm/btext.h>
  50 #include <asm/nvram.h>
  51 #include <asm/setup.h>
  52 #include <asm/system.h>
  53 #include <asm/rtas.h>
  54 #include <asm/iommu.h>
  55 #include <asm/serial.h>
  56 #include <asm/cache.h>
  57 #include <asm/page.h>
  58 #include <asm/mmu.h>
  59 #include <asm/lmb.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 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 171                 unsigned long bogosum = 0;
 172                 int i;
 173                 for_each_online_cpu(i)
 174                         bogosum += loops_per_jiffy;
 175                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 176                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 177 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 178                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 179                 if (ppc_md.name)
 180                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 181                 if (ppc_md.show_cpuinfo != NULL)
 182                         ppc_md.show_cpuinfo(m);
 183
 184                 return 0;
 185         }
 186
 187         /* We only show online cpus: disable preempt (overzealous, I
 188          * knew) to prevent cpu going down. */
 189         preempt_disable();
 190         if (!cpu_online(cpu_id)) {
 191                 preempt_enable();
 192                 return 0;
 193         }
 194
 195 #ifdef CONFIG_SMP
 196         pvr = per_cpu(pvr, cpu_id);
 197 #else
 198         pvr = mfspr(SPRN_PVR);
 199 #endif
 200         maj = (pvr >> 8) & 0xFF;
 201         min = pvr & 0xFF;
 202
 203         seq_printf(m, "processor\t: %lu\n", cpu_id);
 204         seq_printf(m, "cpu\t\t: ");
 205
 206         if (cur_cpu_spec->pvr_mask)
 207                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 208         else
 209                 seq_printf(m, "unknown (%08x)", pvr);
 210
 211 #ifdef CONFIG_ALTIVEC
 212         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 213                 seq_printf(m, ", altivec supported");
 214 #endif /* CONFIG_ALTIVEC */
 215
 216         seq_printf(m, "\n");
 217
 218 #ifdef CONFIG_TAU
 219         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 220 #ifdef CONFIG_TAU_AVERAGE
 221                 /* more straightforward, but potentially misleading */
 222                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 223                            cpu_temp(cpu_id));
 224 #else
 225                 /* show the actual temp sensor range */
 226                 u32 temp;
 227                 temp = cpu_temp_both(cpu_id);
 228                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 229                            temp & 0xff, temp >> 16);
 230 #endif
 231         }
 232 #endif /* CONFIG_TAU */
 233
 234         /*
 235          * Assume here that all clock rates are the same in a
 236          * smp system.  -- Cort
 237          */
 238         if (ppc_proc_freq)
 239                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 240                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 241
 242         if (ppc_md.show_percpuinfo != NULL)
 243                 ppc_md.show_percpuinfo(m, cpu_id);
 244
 245         /* If we are a Freescale core do a simple check so
 246          * we dont have to keep adding cases in the future */
 247         if (PVR_VER(pvr) & 0x8000) {
 248                 maj = PVR_MAJ(pvr);
 249                 min = PVR_MIN(pvr);
 250         } else {
 251                 switch (PVR_VER(pvr)) {
 252                         case 0x0020:    /* 403 family */
 253                                 maj = PVR_MAJ(pvr) + 1;
 254                                 min = PVR_MIN(pvr);
 255                                 break;
 256                         case 0x1008:    /* 740P/750P ?? */
 257                                 maj = ((pvr >> 8) & 0xFF) - 1;
 258                                 min = pvr & 0xFF;
 259                                 break;
 260                         default:
 261                                 maj = (pvr >> 8) & 0xFF;
 262                                 min = pvr & 0xFF;
 263                                 break;
 264                 }
 265         }
 266
 267         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 268                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 269
 270 #ifdef CONFIG_PPC32
 271         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 272                    loops_per_jiffy / (500000/HZ),
 273                    (loops_per_jiffy / (5000/HZ)) % 100);
 274 #endif
 275
 276 #ifdef CONFIG_SMP
 277         seq_printf(m, "\n");
 278 #endif
 279
 280         preempt_enable();
 281         return 0;
 282 }
 283
 284 static void *c_start(struct seq_file *m, loff_t *pos)
 285 {
 286         unsigned long i = *pos;
 287
 288         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 289 }
 290
 291 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 292 {
 293         ++*pos;
 294         return c_start(m, pos);
 295 }
 296
 297 static void c_stop(struct seq_file *m, void *v)
 298 {
 299 }
 300
 301 struct seq_operations cpuinfo_op = {
 302         .start =c_start,
 303         .next = c_next,
 304         .stop = c_stop,
 305         .show = show_cpuinfo,
 306 };
 307
 308 void __init check_for_initrd(void)
 309 {
 310 #ifdef CONFIG_BLK_DEV_INITRD
 311         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 312             initrd_start, initrd_end);
 313
 314         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 315          * look sensible. If not, clear initrd reference.
 316          */
 317         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 318             initrd_end > initrd_start)
 319                 ROOT_DEV = Root_RAM0;
 320         else
 321                 initrd_start = initrd_end = 0;
 322
 323         if (initrd_start)
 324                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 325
 326         DBG(" <- check_for_initrd()\n");
 327 #endif /* CONFIG_BLK_DEV_INITRD */
 328 }
 329
 330 #ifdef CONFIG_SMP
 331
 332 int threads_per_core, threads_shift;
 333 cpumask_t threads_core_mask;
 334
 335 static void __init cpu_init_thread_core_maps(int tpc)
 336 {
 337         int i;
 338
 339         threads_per_core = tpc;
 340         threads_core_mask = CPU_MASK_NONE;
 341
 342         /* This implementation only supports power of 2 number of threads
 343          * for simplicity and performance
 344          */
 345         threads_shift = ilog2(tpc);
 346         BUG_ON(tpc != (1 << threads_shift));
 347
 348         for (i = 0; i < tpc; i++)
 349                 cpu_set(i, threads_core_mask);
 350
 351         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 352                tpc, tpc > 1 ? "s" : "");
 353         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 354 }
 355
 356
 357 /**
 358  * setup_cpu_maps - initialize the following cpu maps:
 359  *                  cpu_possible_map
 360  *                  cpu_present_map
 361  *                  cpu_sibling_map
 362  *
 363  * Having the possible map set up early allows us to restrict allocations
 364  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 365  *
 366  * We do not initialize the online map here; cpus set their own bits in
 367  * cpu_online_map as they come up.
 368  *
 369  * This function is valid only for Open Firmware systems.  finish_device_tree
 370  * must be called before using this.
 371  *
 372  * While we're here, we may as well set the "physical" cpu ids in the paca.
 373  *
 374  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 375  */
 376 void __init smp_setup_cpu_maps(void)
 377 {
 378         struct device_node *dn = NULL;
 379         int cpu = 0;
 380         int nthreads = 1;
 381
 382         DBG("smp_setup_cpu_maps()\n");
 383
 384         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 385                 const int *intserv;
 386                 int j, len;
 387
 388                 DBG("  * %s...\n", dn->full_name);
 389
 390                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 391                                 &len);
 392                 if (intserv) {
 393                         nthreads = len / sizeof(int);
 394                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 395                             nthreads);
 396                 } else {
 397                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 398                         intserv = of_get_property(dn, "reg", NULL);
 399                         if (!intserv)
 400                                 intserv = &cpu; /* assume logical == phys */
 401                 }
 402
 403                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 404                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 405                             j, cpu, intserv[j]);
 406                         cpu_set(cpu, cpu_present_map);
 407                         set_hard_smp_processor_id(cpu, intserv[j]);
 408                         cpu_set(cpu, cpu_possible_map);
 409                         cpu++;
 410                 }
 411         }
 412
 413         /* If no SMT supported, nthreads is forced to 1 */
 414         if (!cpu_has_feature(CPU_FTR_SMT)) {
 415                 DBG("  SMT disabled ! nthreads forced to 1\n");
 416                 nthreads = 1;
 417         }
 418
 419 #ifdef CONFIG_PPC64
 420         /*
 421          * On pSeries LPAR, we need to know how many cpus
 422          * could possibly be added to this partition.
 423          */
 424         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 425             (dn = of_find_node_by_path("/rtas"))) {
 426                 int num_addr_cell, num_size_cell, maxcpus;
 427                 const unsigned int *ireg;
 428
 429                 num_addr_cell = of_n_addr_cells(dn);
 430                 num_size_cell = of_n_size_cells(dn);
 431
 432                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 433
 434                 if (!ireg)
 435                         goto out;
 436
 437                 maxcpus = ireg[num_addr_cell + num_size_cell];
 438
 439                 /* Double maxcpus for processors which have SMT capability */
 440                 if (cpu_has_feature(CPU_FTR_SMT))
 441                         maxcpus *= nthreads;
 442
 443                 if (maxcpus > NR_CPUS) {
 444                         printk(KERN_WARNING
 445                                "Partition configured for %d cpus, "
 446                                "operating system maximum is %d.\n",
 447                                maxcpus, NR_CPUS);
 448                         maxcpus = NR_CPUS;
 449                 } else
 450                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 451                                maxcpus);
 452
 453                 for (cpu = 0; cpu < maxcpus; cpu++)
 454                         cpu_set(cpu, cpu_possible_map);
 455         out:
 456                 of_node_put(dn);
 457         }
 458         vdso_data->processorCount = num_present_cpus();
 459 #endif /* CONFIG_PPC64 */
 460
 461         /* Initialize CPU <=> thread mapping/
 462          *
 463          * WARNING: We assume that the number of threads is the same for
 464          * every CPU in the system. If that is not the case, then some code
 465          * here will have to be reworked
 466          */
 467         cpu_init_thread_core_maps(nthreads);
 468 }
 469
 470 /*
 471  * Being that cpu_sibling_map is now a per_cpu array, then it cannot
 472  * be initialized until the per_cpu areas have been created.  This
 473  * function is now called from setup_per_cpu_areas().
 474  */
 475 void __init smp_setup_cpu_sibling_map(void)
 476 {
 477 #ifdef CONFIG_PPC64
 478         int i, cpu, base;
 479
 480         for_each_possible_cpu(cpu) {
 481                 DBG("Sibling map for CPU %d:", cpu);
 482                 base = cpu_first_thread_in_core(cpu);
 483                 for (i = 0; i < threads_per_core; i++) {
 484                         cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
 485                         DBG(" %d", base + i);
 486                 }
 487                 DBG("\n");
 488         }
 489
 490 #endif /* CONFIG_PPC64 */
 491 }
 492 #endif /* CONFIG_SMP */
 493
 494 static __init int add_pcspkr(void)
 495 {
 496         struct device_node *np;
 497         struct platform_device *pd;
 498         int ret;
 499
 500         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 501         of_node_put(np);
 502         if (!np)
 503                 return -ENODEV;
 504
 505         pd = platform_device_alloc("pcspkr", -1);
 506         if (!pd)
 507                 return -ENOMEM;
 508
 509         ret = platform_device_add(pd);
 510         if (ret)
 511                 platform_device_put(pd);
 512
 513         return ret;
 514 }
 515 device_initcall(add_pcspkr);
 516
 517 void probe_machine(void)
 518 {
 519         extern struct machdep_calls __machine_desc_start;
 520         extern struct machdep_calls __machine_desc_end;
 521
 522         /*
 523          * Iterate all ppc_md structures until we find the proper
 524          * one for the current machine type
 525          */
 526         DBG("Probing machine type ...\n");
 527
 528         for (machine_id = &__machine_desc_start;
 529              machine_id < &__machine_desc_end;
 530              machine_id++) {
 531                 DBG("  %s ...", machine_id->name);
 532                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 533                 if (ppc_md.probe()) {
 534                         DBG(" match !\n");
 535                         break;
 536                 }
 537                 DBG("\n");
 538         }
 539         /* What can we do if we didn't find ? */
 540         if (machine_id >= &__machine_desc_end) {
 541                 DBG("No suitable machine found !\n");
 542                 for (;;);
 543         }
 544
 545         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 546 }
 547
 548 /* Match a class of boards, not a specific device configuration. */
 549 int check_legacy_ioport(unsigned long base_port)
 550 {
 551         struct device_node *parent, *np = NULL;
 552         int ret = -ENODEV;
 553
 554         switch(base_port) {
 555         case I8042_DATA_REG:
 556                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 557                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 558                 if (np) {
 559                         parent = of_get_parent(np);
 560                         of_node_put(np);
 561                         np = parent;
 562                         break;
 563                 }
 564                 np = of_find_node_by_type(NULL, "8042");
 565                 /* Pegasos has no device_type on its 8042 node, look for the
 566                  * name instead */
 567                 if (!np)
 568                         np = of_find_node_by_name(NULL, "8042");
 569                 break;
 570         case FDC_BASE: /* FDC1 */
 571                 np = of_find_node_by_type(NULL, "fdc");
 572                 break;
 573 #ifdef CONFIG_PPC_PREP
 574         case _PIDXR:
 575         case _PNPWRP:
 576         case PNPBIOS_BASE:
 577                 /* implement me */
 578 #endif
 579         default:
 580                 /* ipmi is supposed to fail here */
 581                 break;
 582         }
 583         if (!np)
 584                 return ret;
 585         parent = of_get_parent(np);
 586         if (parent) {
 587                 if (strcmp(parent->type, "isa") == 0)
 588                         ret = 0;
 589                 of_node_put(parent);
 590         }
 591         of_node_put(np);
 592         return ret;
 593 }
 594 EXPORT_SYMBOL(check_legacy_ioport);
 595
 596 static int ppc_panic_event(struct notifier_block *this,
 597                              unsigned long event, void *ptr)
 598 {
 599         ppc_md.panic(ptr);  /* May not return */
 600         return NOTIFY_DONE;
 601 }
 602
 603 static struct notifier_block ppc_panic_block = {
 604         .notifier_call = ppc_panic_event,
 605         .priority = INT_MIN /* may not return; must be done last */
 606 };
 607
 608 void __init setup_panic(void)
 609 {
 610         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 611 }
 612
 613 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 614 /*
 615  * For platforms that have configurable cache-coherency.  This function
 616  * checks that the cache coherency setting of the kernel matches the setting
 617  * left by the firmware, as indicated in the device tree.  Since a mismatch
 618  * will eventually result in DMA failures, we print * and error and call
 619  * BUG() in that case.
 620  */
 621
 622 #ifdef CONFIG_NOT_COHERENT_CACHE
 623 #define KERNEL_COHERENCY        0
 624 #else
 625 #define KERNEL_COHERENCY        1
 626 #endif
 627
 628 static int __init check_cache_coherency(void)
 629 {
 630         struct device_node *np;
 631         const void *prop;
 632         int devtree_coherency;
 633
 634         np = of_find_node_by_path("/");
 635         prop = of_get_property(np, "coherency-off", NULL);
 636         of_node_put(np);
 637
 638         devtree_coherency = prop ? 0 : 1;
 639
 640         if (devtree_coherency != KERNEL_COHERENCY) {
 641                 printk(KERN_ERR
 642                         "kernel coherency:%s != device tree_coherency:%s\n",
 643                         KERNEL_COHERENCY ? "on" : "off",
 644                         devtree_coherency ? "on" : "off");
 645                 BUG();
 646         }
 647
 648         return 0;
 649 }
 650
 651 late_initcall(check_cache_coherency);
 652 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 653
 654 #ifdef CONFIG_DEBUG_FS
 655 struct dentry *powerpc_debugfs_root;
 656
 657 static int powerpc_debugfs_init(void)
 658 {
 659         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 660
 661         return powerpc_debugfs_root == NULL;
 662 }
 663 arch_initcall(powerpc_debugfs_init);
 664 #endif