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/ide.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/ioport.h>
  27 #include <linux/console.h>
  28 #include <linux/utsname.h>
  29 #include <linux/screen_info.h>
  30 #include <linux/root_dev.h>
  31 #include <linux/notifier.h>
  32 #include <linux/cpu.h>
  33 #include <linux/unistd.h>
  34 #include <linux/serial.h>
  35 #include <linux/serial_8250.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 /*
  80  * This still seems to be needed... -- paulus
  81  */
  82 struct screen_info screen_info = {
  83         .orig_x = 0,
  84         .orig_y = 25,
  85         .orig_video_cols = 80,
  86         .orig_video_lines = 25,
  87         .orig_video_isVGA = 1,
  88         .orig_video_points = 16
  89 };
  90
  91 #ifdef __DO_IRQ_CANON
  92 /* XXX should go elsewhere eventually */
  93 int ppc_do_canonicalize_irqs;
  94 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  95 #endif
  96
  97 /* also used by kexec */
  98 void machine_shutdown(void)
  99 {
 100         if (ppc_md.machine_shutdown)
 101                 ppc_md.machine_shutdown();
 102 }
 103
 104 void machine_restart(char *cmd)
 105 {
 106         machine_shutdown();
 107         if (ppc_md.restart)
 108                 ppc_md.restart(cmd);
 109 #ifdef CONFIG_SMP
 110         smp_send_stop();
 111 #endif
 112         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 113         local_irq_disable();
 114         while (1) ;
 115 }
 116
 117 void machine_power_off(void)
 118 {
 119         machine_shutdown();
 120         if (ppc_md.power_off)
 121                 ppc_md.power_off();
 122 #ifdef CONFIG_SMP
 123         smp_send_stop();
 124 #endif
 125         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 126         local_irq_disable();
 127         while (1) ;
 128 }
 129 /* Used by the G5 thermal driver */
 130 EXPORT_SYMBOL_GPL(machine_power_off);
 131
 132 void (*pm_power_off)(void) = machine_power_off;
 133 EXPORT_SYMBOL_GPL(pm_power_off);
 134
 135 void machine_halt(void)
 136 {
 137         machine_shutdown();
 138         if (ppc_md.halt)
 139                 ppc_md.halt();
 140 #ifdef CONFIG_SMP
 141         smp_send_stop();
 142 #endif
 143         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 144         local_irq_disable();
 145         while (1) ;
 146 }
 147
 148
 149 #ifdef CONFIG_TAU
 150 extern u32 cpu_temp(unsigned long cpu);
 151 extern u32 cpu_temp_both(unsigned long cpu);
 152 #endif /* CONFIG_TAU */
 153
 154 #ifdef CONFIG_SMP
 155 DEFINE_PER_CPU(unsigned int, pvr);
 156 #endif
 157
 158 static int show_cpuinfo(struct seq_file *m, void *v)
 159 {
 160         unsigned long cpu_id = (unsigned long)v - 1;
 161         unsigned int pvr;
 162         unsigned short maj;
 163         unsigned short min;
 164
 165         if (cpu_id == NR_CPUS) {
 166 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 167                 unsigned long bogosum = 0;
 168                 int i;
 169                 for_each_online_cpu(i)
 170                         bogosum += loops_per_jiffy;
 171                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 172                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 173 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 174                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 175                 if (ppc_md.name)
 176                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 177                 if (ppc_md.show_cpuinfo != NULL)
 178                         ppc_md.show_cpuinfo(m);
 179
 180                 return 0;
 181         }
 182
 183         /* We only show online cpus: disable preempt (overzealous, I
 184          * knew) to prevent cpu going down. */
 185         preempt_disable();
 186         if (!cpu_online(cpu_id)) {
 187                 preempt_enable();
 188                 return 0;
 189         }
 190
 191 #ifdef CONFIG_SMP
 192         pvr = per_cpu(pvr, cpu_id);
 193 #else
 194         pvr = mfspr(SPRN_PVR);
 195 #endif
 196         maj = (pvr >> 8) & 0xFF;
 197         min = pvr & 0xFF;
 198
 199         seq_printf(m, "processor\t: %lu\n", cpu_id);
 200         seq_printf(m, "cpu\t\t: ");
 201
 202         if (cur_cpu_spec->pvr_mask)
 203                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 204         else
 205                 seq_printf(m, "unknown (%08x)", pvr);
 206
 207 #ifdef CONFIG_ALTIVEC
 208         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 209                 seq_printf(m, ", altivec supported");
 210 #endif /* CONFIG_ALTIVEC */
 211
 212         seq_printf(m, "\n");
 213
 214 #ifdef CONFIG_TAU
 215         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 216 #ifdef CONFIG_TAU_AVERAGE
 217                 /* more straightforward, but potentially misleading */
 218                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 219                            cpu_temp(cpu_id));
 220 #else
 221                 /* show the actual temp sensor range */
 222                 u32 temp;
 223                 temp = cpu_temp_both(cpu_id);
 224                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 225                            temp & 0xff, temp >> 16);
 226 #endif
 227         }
 228 #endif /* CONFIG_TAU */
 229
 230         /*
 231          * Assume here that all clock rates are the same in a
 232          * smp system.  -- Cort
 233          */
 234         if (ppc_proc_freq)
 235                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 236                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 237
 238         if (ppc_md.show_percpuinfo != NULL)
 239                 ppc_md.show_percpuinfo(m, cpu_id);
 240
 241         /* If we are a Freescale core do a simple check so
 242          * we dont have to keep adding cases in the future */
 243         if (PVR_VER(pvr) & 0x8000) {
 244                 maj = PVR_MAJ(pvr);
 245                 min = PVR_MIN(pvr);
 246         } else {
 247                 switch (PVR_VER(pvr)) {
 248                         case 0x0020:    /* 403 family */
 249                                 maj = PVR_MAJ(pvr) + 1;
 250                                 min = PVR_MIN(pvr);
 251                                 break;
 252                         case 0x1008:    /* 740P/750P ?? */
 253                                 maj = ((pvr >> 8) & 0xFF) - 1;
 254                                 min = pvr & 0xFF;
 255                                 break;
 256                         default:
 257                                 maj = (pvr >> 8) & 0xFF;
 258                                 min = pvr & 0xFF;
 259                                 break;
 260                 }
 261         }
 262
 263         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 264                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 265
 266 #ifdef CONFIG_PPC32
 267         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 268                    loops_per_jiffy / (500000/HZ),
 269                    (loops_per_jiffy / (5000/HZ)) % 100);
 270 #endif
 271
 272 #ifdef CONFIG_SMP
 273         seq_printf(m, "\n");
 274 #endif
 275
 276         preempt_enable();
 277         return 0;
 278 }
 279
 280 static void *c_start(struct seq_file *m, loff_t *pos)
 281 {
 282         unsigned long i = *pos;
 283
 284         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 285 }
 286
 287 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 288 {
 289         ++*pos;
 290         return c_start(m, pos);
 291 }
 292
 293 static void c_stop(struct seq_file *m, void *v)
 294 {
 295 }
 296
 297 struct seq_operations cpuinfo_op = {
 298         .start =c_start,
 299         .next = c_next,
 300         .stop = c_stop,
 301         .show = show_cpuinfo,
 302 };
 303
 304 void __init check_for_initrd(void)
 305 {
 306 #ifdef CONFIG_BLK_DEV_INITRD
 307         const unsigned int *prop;
 308         int len;
 309
 310         DBG(" -> check_for_initrd()\n");
 311
 312         if (of_chosen) {
 313                 prop = get_property(of_chosen, "linux,initrd-start", &len);
 314                 if (prop != NULL) {
 315                         initrd_start = (unsigned long)
 316                                 __va(of_read_ulong(prop, len / 4));
 317                         prop = get_property(of_chosen,
 318                                         "linux,initrd-end", &len);
 319                         if (prop != NULL) {
 320                                 initrd_end = (unsigned long)
 321                                         __va(of_read_ulong(prop, len / 4));
 322                                 initrd_below_start_ok = 1;
 323                         } else
 324                                 initrd_start = 0;
 325                 }
 326         }
 327
 328         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 329          * look sensible. If not, clear initrd reference.
 330          */
 331         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 332             initrd_end > initrd_start)
 333                 ROOT_DEV = Root_RAM0;
 334         else
 335                 initrd_start = initrd_end = 0;
 336
 337         if (initrd_start)
 338                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 339
 340         DBG(" <- check_for_initrd()\n");
 341 #endif /* CONFIG_BLK_DEV_INITRD */
 342 }
 343
 344 #ifdef CONFIG_SMP
 345
 346 /**
 347  * setup_cpu_maps - initialize the following cpu maps:
 348  *                  cpu_possible_map
 349  *                  cpu_present_map
 350  *                  cpu_sibling_map
 351  *
 352  * Having the possible map set up early allows us to restrict allocations
 353  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 354  *
 355  * We do not initialize the online map here; cpus set their own bits in
 356  * cpu_online_map as they come up.
 357  *
 358  * This function is valid only for Open Firmware systems.  finish_device_tree
 359  * must be called before using this.
 360  *
 361  * While we're here, we may as well set the "physical" cpu ids in the paca.
 362  *
 363  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 364  */
 365 void __init smp_setup_cpu_maps(void)
 366 {
 367         struct device_node *dn = NULL;
 368         int cpu = 0;
 369
 370         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 371                 const int *intserv;
 372                 int j, len = sizeof(u32), nthreads = 1;
 373
 374                 intserv = get_property(dn, "ibm,ppc-interrupt-server#s", &len);
 375                 if (intserv)
 376                         nthreads = len / sizeof(int);
 377                 else {
 378                         intserv = get_property(dn, "reg", NULL);
 379                         if (!intserv)
 380                                 intserv = &cpu; /* assume logical == phys */
 381                 }
 382
 383                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 384                         cpu_set(cpu, cpu_present_map);
 385                         set_hard_smp_processor_id(cpu, intserv[j]);
 386                         cpu_set(cpu, cpu_possible_map);
 387                         cpu++;
 388                 }
 389         }
 390
 391 #ifdef CONFIG_PPC64
 392         /*
 393          * On pSeries LPAR, we need to know how many cpus
 394          * could possibly be added to this partition.
 395          */
 396         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 397             (dn = of_find_node_by_path("/rtas"))) {
 398                 int num_addr_cell, num_size_cell, maxcpus;
 399                 const unsigned int *ireg;
 400
 401                 num_addr_cell = prom_n_addr_cells(dn);
 402                 num_size_cell = prom_n_size_cells(dn);
 403
 404                 ireg = get_property(dn, "ibm,lrdr-capacity", NULL);
 405
 406                 if (!ireg)
 407                         goto out;
 408
 409                 maxcpus = ireg[num_addr_cell + num_size_cell];
 410
 411                 /* Double maxcpus for processors which have SMT capability */
 412                 if (cpu_has_feature(CPU_FTR_SMT))
 413                         maxcpus *= 2;
 414
 415                 if (maxcpus > NR_CPUS) {
 416                         printk(KERN_WARNING
 417                                "Partition configured for %d cpus, "
 418                                "operating system maximum is %d.\n",
 419                                maxcpus, NR_CPUS);
 420                         maxcpus = NR_CPUS;
 421                 } else
 422                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 423                                maxcpus);
 424
 425                 for (cpu = 0; cpu < maxcpus; cpu++)
 426                         cpu_set(cpu, cpu_possible_map);
 427         out:
 428                 of_node_put(dn);
 429         }
 430
 431         /*
 432          * Do the sibling map; assume only two threads per processor.
 433          */
 434         for_each_possible_cpu(cpu) {
 435                 cpu_set(cpu, cpu_sibling_map[cpu]);
 436                 if (cpu_has_feature(CPU_FTR_SMT))
 437                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 438         }
 439
 440         vdso_data->processorCount = num_present_cpus();
 441 #endif /* CONFIG_PPC64 */
 442 }
 443 #endif /* CONFIG_SMP */
 444
 445 int __initdata do_early_xmon;
 446 #ifdef CONFIG_XMON
 447 extern int xmon_no_auto_backtrace;
 448
 449 static int __init early_xmon(char *p)
 450 {
 451         /* ensure xmon is enabled */
 452         if (p) {
 453                 if (strncmp(p, "on", 2) == 0)
 454                         xmon_init(1);
 455                 if (strncmp(p, "off", 3) == 0)
 456                         xmon_init(0);
 457                 if (strncmp(p, "nobt", 4) == 0)
 458                         xmon_no_auto_backtrace = 1;
 459                 if (strncmp(p, "early", 5) != 0)
 460                         return 0;
 461         }
 462         xmon_init(1);
 463         do_early_xmon = 1;
 464
 465         return 0;
 466 }
 467 early_param("xmon", early_xmon);
 468 #endif
 469
 470 static __init int add_pcspkr(void)
 471 {
 472         struct device_node *np;
 473         struct platform_device *pd;
 474         int ret;
 475
 476         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 477         of_node_put(np);
 478         if (!np)
 479                 return -ENODEV;
 480
 481         pd = platform_device_alloc("pcspkr", -1);
 482         if (!pd)
 483                 return -ENOMEM;
 484
 485         ret = platform_device_add(pd);
 486         if (ret)
 487                 platform_device_put(pd);
 488
 489         return ret;
 490 }
 491 device_initcall(add_pcspkr);
 492
 493 void probe_machine(void)
 494 {
 495         extern struct machdep_calls __machine_desc_start;
 496         extern struct machdep_calls __machine_desc_end;
 497
 498         /*
 499          * Iterate all ppc_md structures until we find the proper
 500          * one for the current machine type
 501          */
 502         DBG("Probing machine type ...\n");
 503
 504         for (machine_id = &__machine_desc_start;
 505              machine_id < &__machine_desc_end;
 506              machine_id++) {
 507                 DBG("  %s ...", machine_id->name);
 508                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 509                 if (ppc_md.probe()) {
 510                         DBG(" match !\n");
 511                         break;
 512                 }
 513                 DBG("\n");
 514         }
 515         /* What can we do if we didn't find ? */
 516         if (machine_id >= &__machine_desc_end) {
 517                 DBG("No suitable machine found !\n");
 518                 for (;;);
 519         }
 520
 521         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 522 }
 523
 524 int check_legacy_ioport(unsigned long base_port)
 525 {
 526         if (ppc_md.check_legacy_ioport == NULL)
 527                 return 0;
 528         return ppc_md.check_legacy_ioport(base_port);
 529 }
 530 EXPORT_SYMBOL(check_legacy_ioport);
 531
 532 static int ppc_panic_event(struct notifier_block *this,
 533                              unsigned long event, void *ptr)
 534 {
 535         ppc_md.panic(ptr);  /* May not return */
 536         return NOTIFY_DONE;
 537 }
 538
 539 static struct notifier_block ppc_panic_block = {
 540         .notifier_call = ppc_panic_event,
 541         .priority = INT_MIN /* may not return; must be done last */
 542 };
 543
 544 void __init setup_panic(void)
 545 {
 546         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 547 }