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 <asm/io.h>
  37 #include <asm/prom.h>
  38 #include <asm/processor.h>
  39 #include <asm/vdso_datapage.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/smp.h>
  42 #include <asm/elf.h>
  43 #include <asm/machdep.h>
  44 #include <asm/time.h>
  45 #include <asm/cputable.h>
  46 #include <asm/sections.h>
  47 #include <asm/firmware.h>
  48 #include <asm/btext.h>
  49 #include <asm/nvram.h>
  50 #include <asm/setup.h>
  51 #include <asm/system.h>
  52 #include <asm/rtas.h>
  53 #include <asm/iommu.h>
  54 #include <asm/serial.h>
  55 #include <asm/cache.h>
  56 #include <asm/page.h>
  57 #include <asm/mmu.h>
  58 #include <asm/lmb.h>
  59 #include <asm/xmon.h>
  60
  61 #include "setup.h"
  62
  63 #ifdef DEBUG
  64 #include <asm/udbg.h>
  65 #define DBG(fmt...) udbg_printf(fmt)
  66 #else
  67 #define DBG(fmt...)
  68 #endif
  69
  70 /* The main machine-dep calls structure
  71  */
  72 struct machdep_calls ppc_md;
  73 EXPORT_SYMBOL(ppc_md);
  74 struct machdep_calls *machine_id;
  75 EXPORT_SYMBOL(machine_id);
  76
  77 unsigned long klimit = (unsigned long) _end;
  78
  79 char cmd_line[COMMAND_LINE_SIZE];
  80
  81 /*
  82  * This still seems to be needed... -- paulus
  83  */
  84 struct screen_info screen_info = {
  85         .orig_x = 0,
  86         .orig_y = 25,
  87         .orig_video_cols = 80,
  88         .orig_video_lines = 25,
  89         .orig_video_isVGA = 1,
  90         .orig_video_points = 16
  91 };
  92
  93 #ifdef __DO_IRQ_CANON
  94 /* XXX should go elsewhere eventually */
  95 int ppc_do_canonicalize_irqs;
  96 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  97 #endif
  98
  99 /* also used by kexec */
 100 void machine_shutdown(void)
 101 {
 102         if (ppc_md.machine_shutdown)
 103                 ppc_md.machine_shutdown();
 104 }
 105
 106 void machine_restart(char *cmd)
 107 {
 108         machine_shutdown();
 109         if (ppc_md.restart)
 110                 ppc_md.restart(cmd);
 111 #ifdef CONFIG_SMP
 112         smp_send_stop();
 113 #endif
 114         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 115         local_irq_disable();
 116         while (1) ;
 117 }
 118
 119 void machine_power_off(void)
 120 {
 121         machine_shutdown();
 122         if (ppc_md.power_off)
 123                 ppc_md.power_off();
 124 #ifdef CONFIG_SMP
 125         smp_send_stop();
 126 #endif
 127         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 128         local_irq_disable();
 129         while (1) ;
 130 }
 131 /* Used by the G5 thermal driver */
 132 EXPORT_SYMBOL_GPL(machine_power_off);
 133
 134 void (*pm_power_off)(void) = machine_power_off;
 135 EXPORT_SYMBOL_GPL(pm_power_off);
 136
 137 void machine_halt(void)
 138 {
 139         machine_shutdown();
 140         if (ppc_md.halt)
 141                 ppc_md.halt();
 142 #ifdef CONFIG_SMP
 143         smp_send_stop();
 144 #endif
 145         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 146         local_irq_disable();
 147         while (1) ;
 148 }
 149
 150
 151 #ifdef CONFIG_TAU
 152 extern u32 cpu_temp(unsigned long cpu);
 153 extern u32 cpu_temp_both(unsigned long cpu);
 154 #endif /* CONFIG_TAU */
 155
 156 #ifdef CONFIG_SMP
 157 DEFINE_PER_CPU(unsigned int, pvr);
 158 #endif
 159
 160 static int show_cpuinfo(struct seq_file *m, void *v)
 161 {
 162         unsigned long cpu_id = (unsigned long)v - 1;
 163         unsigned int pvr;
 164         unsigned short maj;
 165         unsigned short min;
 166
 167         if (cpu_id == NR_CPUS) {
 168 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 169                 unsigned long bogosum = 0;
 170                 int i;
 171                 for_each_online_cpu(i)
 172                         bogosum += loops_per_jiffy;
 173                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 174                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 175 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 176                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 177                 if (ppc_md.name)
 178                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 179                 if (ppc_md.show_cpuinfo != NULL)
 180                         ppc_md.show_cpuinfo(m);
 181
 182                 return 0;
 183         }
 184
 185         /* We only show online cpus: disable preempt (overzealous, I
 186          * knew) to prevent cpu going down. */
 187         preempt_disable();
 188         if (!cpu_online(cpu_id)) {
 189                 preempt_enable();
 190                 return 0;
 191         }
 192
 193 #ifdef CONFIG_SMP
 194         pvr = per_cpu(pvr, cpu_id);
 195 #else
 196         pvr = mfspr(SPRN_PVR);
 197 #endif
 198         maj = (pvr >> 8) & 0xFF;
 199         min = pvr & 0xFF;
 200
 201         seq_printf(m, "processor\t: %lu\n", cpu_id);
 202         seq_printf(m, "cpu\t\t: ");
 203
 204         if (cur_cpu_spec->pvr_mask)
 205                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 206         else
 207                 seq_printf(m, "unknown (%08x)", pvr);
 208
 209 #ifdef CONFIG_ALTIVEC
 210         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 211                 seq_printf(m, ", altivec supported");
 212 #endif /* CONFIG_ALTIVEC */
 213
 214         seq_printf(m, "\n");
 215
 216 #ifdef CONFIG_TAU
 217         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 218 #ifdef CONFIG_TAU_AVERAGE
 219                 /* more straightforward, but potentially misleading */
 220                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 221                            cpu_temp(cpu_id));
 222 #else
 223                 /* show the actual temp sensor range */
 224                 u32 temp;
 225                 temp = cpu_temp_both(cpu_id);
 226                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 227                            temp & 0xff, temp >> 16);
 228 #endif
 229         }
 230 #endif /* CONFIG_TAU */
 231
 232         /*
 233          * Assume here that all clock rates are the same in a
 234          * smp system.  -- Cort
 235          */
 236         if (ppc_proc_freq)
 237                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 238                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 239
 240         if (ppc_md.show_percpuinfo != NULL)
 241                 ppc_md.show_percpuinfo(m, cpu_id);
 242
 243         /* If we are a Freescale core do a simple check so
 244          * we dont have to keep adding cases in the future */
 245         if (PVR_VER(pvr) & 0x8000) {
 246                 maj = PVR_MAJ(pvr);
 247                 min = PVR_MIN(pvr);
 248         } else {
 249                 switch (PVR_VER(pvr)) {
 250                         case 0x0020:    /* 403 family */
 251                                 maj = PVR_MAJ(pvr) + 1;
 252                                 min = PVR_MIN(pvr);
 253                                 break;
 254                         case 0x1008:    /* 740P/750P ?? */
 255                                 maj = ((pvr >> 8) & 0xFF) - 1;
 256                                 min = pvr & 0xFF;
 257                                 break;
 258                         default:
 259                                 maj = (pvr >> 8) & 0xFF;
 260                                 min = pvr & 0xFF;
 261                                 break;
 262                 }
 263         }
 264
 265         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 266                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 267
 268 #ifdef CONFIG_PPC32
 269         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 270                    loops_per_jiffy / (500000/HZ),
 271                    (loops_per_jiffy / (5000/HZ)) % 100);
 272 #endif
 273
 274 #ifdef CONFIG_SMP
 275         seq_printf(m, "\n");
 276 #endif
 277
 278         preempt_enable();
 279         return 0;
 280 }
 281
 282 static void *c_start(struct seq_file *m, loff_t *pos)
 283 {
 284         unsigned long i = *pos;
 285
 286         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 287 }
 288
 289 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 290 {
 291         ++*pos;
 292         return c_start(m, pos);
 293 }
 294
 295 static void c_stop(struct seq_file *m, void *v)
 296 {
 297 }
 298
 299 struct seq_operations cpuinfo_op = {
 300         .start =c_start,
 301         .next = c_next,
 302         .stop = c_stop,
 303         .show = show_cpuinfo,
 304 };
 305
 306 void __init check_for_initrd(void)
 307 {
 308 #ifdef CONFIG_BLK_DEV_INITRD
 309         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 310             initrd_start, initrd_end);
 311
 312         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 313          * look sensible. If not, clear initrd reference.
 314          */
 315         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 316             initrd_end > initrd_start)
 317                 ROOT_DEV = Root_RAM0;
 318         else
 319                 initrd_start = initrd_end = 0;
 320
 321         if (initrd_start)
 322                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 323
 324         DBG(" <- check_for_initrd()\n");
 325 #endif /* CONFIG_BLK_DEV_INITRD */
 326 }
 327
 328 #ifdef CONFIG_SMP
 329
 330 /**
 331  * setup_cpu_maps - initialize the following cpu maps:
 332  *                  cpu_possible_map
 333  *                  cpu_present_map
 334  *                  cpu_sibling_map
 335  *
 336  * Having the possible map set up early allows us to restrict allocations
 337  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 338  *
 339  * We do not initialize the online map here; cpus set their own bits in
 340  * cpu_online_map as they come up.
 341  *
 342  * This function is valid only for Open Firmware systems.  finish_device_tree
 343  * must be called before using this.
 344  *
 345  * While we're here, we may as well set the "physical" cpu ids in the paca.
 346  *
 347  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 348  */
 349 void __init smp_setup_cpu_maps(void)
 350 {
 351         struct device_node *dn = NULL;
 352         int cpu = 0;
 353
 354         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 355                 const int *intserv;
 356                 int j, len = sizeof(u32), nthreads = 1;
 357
 358                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 359                                 &len);
 360                 if (intserv)
 361                         nthreads = len / sizeof(int);
 362                 else {
 363                         intserv = of_get_property(dn, "reg", NULL);
 364                         if (!intserv)
 365                                 intserv = &cpu; /* assume logical == phys */
 366                 }
 367
 368                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 369                         cpu_set(cpu, cpu_present_map);
 370                         set_hard_smp_processor_id(cpu, intserv[j]);
 371                         cpu_set(cpu, cpu_possible_map);
 372                         cpu++;
 373                 }
 374         }
 375
 376 #ifdef CONFIG_PPC64
 377         /*
 378          * On pSeries LPAR, we need to know how many cpus
 379          * could possibly be added to this partition.
 380          */
 381         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 382             (dn = of_find_node_by_path("/rtas"))) {
 383                 int num_addr_cell, num_size_cell, maxcpus;
 384                 const unsigned int *ireg;
 385
 386                 num_addr_cell = of_n_addr_cells(dn);
 387                 num_size_cell = of_n_size_cells(dn);
 388
 389                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 390
 391                 if (!ireg)
 392                         goto out;
 393
 394                 maxcpus = ireg[num_addr_cell + num_size_cell];
 395
 396                 /* Double maxcpus for processors which have SMT capability */
 397                 if (cpu_has_feature(CPU_FTR_SMT))
 398                         maxcpus *= 2;
 399
 400                 if (maxcpus > NR_CPUS) {
 401                         printk(KERN_WARNING
 402                                "Partition configured for %d cpus, "
 403                                "operating system maximum is %d.\n",
 404                                maxcpus, NR_CPUS);
 405                         maxcpus = NR_CPUS;
 406                 } else
 407                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 408                                maxcpus);
 409
 410                 for (cpu = 0; cpu < maxcpus; cpu++)
 411                         cpu_set(cpu, cpu_possible_map);
 412         out:
 413                 of_node_put(dn);
 414         }
 415
 416         vdso_data->processorCount = num_present_cpus();
 417 #endif /* CONFIG_PPC64 */
 418 }
 419
 420 /*
 421  * Being that cpu_sibling_map is now a per_cpu array, then it cannot
 422  * be initialized until the per_cpu areas have been created.  This
 423  * function is now called from setup_per_cpu_areas().
 424  */
 425 void __init smp_setup_cpu_sibling_map(void)
 426 {
 427 #if defined(CONFIG_PPC64)
 428         int cpu;
 429
 430         /*
 431          * Do the sibling map; assume only two threads per processor.
 432          */
 433         for_each_possible_cpu(cpu) {
 434                 cpu_set(cpu, per_cpu(cpu_sibling_map, cpu));
 435                 if (cpu_has_feature(CPU_FTR_SMT))
 436                         cpu_set(cpu ^ 0x1, per_cpu(cpu_sibling_map, cpu));
 437         }
 438 #endif /* CONFIG_PPC64 */
 439 }
 440 #endif /* CONFIG_SMP */
 441
 442 static __init int add_pcspkr(void)
 443 {
 444         struct device_node *np;
 445         struct platform_device *pd;
 446         int ret;
 447
 448         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 449         of_node_put(np);
 450         if (!np)
 451                 return -ENODEV;
 452
 453         pd = platform_device_alloc("pcspkr", -1);
 454         if (!pd)
 455                 return -ENOMEM;
 456
 457         ret = platform_device_add(pd);
 458         if (ret)
 459                 platform_device_put(pd);
 460
 461         return ret;
 462 }
 463 device_initcall(add_pcspkr);
 464
 465 void probe_machine(void)
 466 {
 467         extern struct machdep_calls __machine_desc_start;
 468         extern struct machdep_calls __machine_desc_end;
 469
 470         /*
 471          * Iterate all ppc_md structures until we find the proper
 472          * one for the current machine type
 473          */
 474         DBG("Probing machine type ...\n");
 475
 476         for (machine_id = &__machine_desc_start;
 477              machine_id < &__machine_desc_end;
 478              machine_id++) {
 479                 DBG("  %s ...", machine_id->name);
 480                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 481                 if (ppc_md.probe()) {
 482                         DBG(" match !\n");
 483                         break;
 484                 }
 485                 DBG("\n");
 486         }
 487         /* What can we do if we didn't find ? */
 488         if (machine_id >= &__machine_desc_end) {
 489                 DBG("No suitable machine found !\n");
 490                 for (;;);
 491         }
 492
 493         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 494 }
 495
 496 /* Match a class of boards, not a specific device configuration. */
 497 int check_legacy_ioport(unsigned long base_port)
 498 {
 499         struct device_node *parent, *np = NULL;
 500         int ret = -ENODEV;
 501
 502         switch(base_port) {
 503         case I8042_DATA_REG:
 504                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 505                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 506                 if (np) {
 507                         parent = of_get_parent(np);
 508                         of_node_put(np);
 509                         np = parent;
 510                         break;
 511                 }
 512                 np = of_find_node_by_type(NULL, "8042");
 513                 /* Pegasos has no device_type on its 8042 node, look for the
 514                  * name instead */
 515                 if (!np)
 516                         np = of_find_node_by_name(NULL, "8042");
 517                 break;
 518         case FDC_BASE: /* FDC1 */
 519                 np = of_find_node_by_type(NULL, "fdc");
 520                 break;
 521 #ifdef CONFIG_PPC_PREP
 522         case _PIDXR:
 523         case _PNPWRP:
 524         case PNPBIOS_BASE:
 525                 /* implement me */
 526 #endif
 527         default:
 528                 /* ipmi is supposed to fail here */
 529                 break;
 530         }
 531         if (!np)
 532                 return ret;
 533         parent = of_get_parent(np);
 534         if (parent) {
 535                 if (strcmp(parent->type, "isa") == 0)
 536                         ret = 0;
 537                 of_node_put(parent);
 538         }
 539         of_node_put(np);
 540         return ret;
 541 }
 542 EXPORT_SYMBOL(check_legacy_ioport);
 543
 544 static int ppc_panic_event(struct notifier_block *this,
 545                              unsigned long event, void *ptr)
 546 {
 547         ppc_md.panic(ptr);  /* May not return */
 548         return NOTIFY_DONE;
 549 }
 550
 551 static struct notifier_block ppc_panic_block = {
 552         .notifier_call = ppc_panic_event,
 553         .priority = INT_MIN /* may not return; must be done last */
 554 };
 555
 556 void __init setup_panic(void)
 557 {
 558         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 559 }
 560
 561 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 562 /*
 563  * For platforms that have configurable cache-coherency.  This function
 564  * checks that the cache coherency setting of the kernel matches the setting
 565  * left by the firmware, as indicated in the device tree.  Since a mismatch
 566  * will eventually result in DMA failures, we print * and error and call
 567  * BUG() in that case.
 568  */
 569
 570 #ifdef CONFIG_NOT_COHERENT_CACHE
 571 #define KERNEL_COHERENCY        0
 572 #else
 573 #define KERNEL_COHERENCY        1
 574 #endif
 575
 576 static int __init check_cache_coherency(void)
 577 {
 578         struct device_node *np;
 579         const void *prop;
 580         int devtree_coherency;
 581
 582         np = of_find_node_by_path("/");
 583         prop = of_get_property(np, "coherency-off", NULL);
 584         of_node_put(np);
 585
 586         devtree_coherency = prop ? 0 : 1;
 587
 588         if (devtree_coherency != KERNEL_COHERENCY) {
 589                 printk(KERN_ERR
 590                         "kernel coherency:%s != device tree_coherency:%s\n",
 591                         KERNEL_COHERENCY ? "on" : "off",
 592                         devtree_coherency ? "on" : "off");
 593                 BUG();
 594         }
 595
 596         return 0;
 597 }
 598
 599 late_initcall(check_cache_coherency);
 600 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 601
 602 #ifdef CONFIG_DEBUG_FS
 603 struct dentry *powerpc_debugfs_root;
 604
 605 static int powerpc_debugfs_init(void)
 606 {
 607         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 608
 609         return powerpc_debugfs_root == NULL;
 610 }
 611 arch_initcall(powerpc_debugfs_init);
 612 #endif