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 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/sched.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/reboot.h>
  19 #include <linux/delay.h>
  20 #include <linux/initrd.h>
  21 #include <linux/ide.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/ioport.h>
  24 #include <linux/console.h>
  25 #include <linux/utsname.h>
  26 #include <linux/tty.h>
  27 #include <linux/root_dev.h>
  28 #include <linux/notifier.h>
  29 #include <linux/cpu.h>
  30 #include <linux/unistd.h>
  31 #include <linux/serial.h>
  32 #include <linux/serial_8250.h>
  33 #include <asm/io.h>
  34 #include <asm/prom.h>
  35 #include <asm/processor.h>
  36 #include <asm/vdso_datapage.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/smp.h>
  39 #include <asm/elf.h>
  40 #include <asm/machdep.h>
  41 #include <asm/time.h>
  42 #include <asm/cputable.h>
  43 #include <asm/sections.h>
  44 #include <asm/btext.h>
  45 #include <asm/nvram.h>
  46 #include <asm/setup.h>
  47 #include <asm/system.h>
  48 #include <asm/rtas.h>
  49 #include <asm/iommu.h>
  50 #include <asm/serial.h>
  51 #include <asm/cache.h>
  52 #include <asm/page.h>
  53 #include <asm/mmu.h>
  54 #include <asm/lmb.h>
  55 #include <asm/xmon.h>
  56
  57 #include "setup.h"
  58
  59 #undef DEBUG
  60
  61 #ifdef DEBUG
  62 #define DBG(fmt...) udbg_printf(fmt)
  63 #else
  64 #define DBG(fmt...)
  65 #endif
  66
  67 #ifdef CONFIG_PPC_MULTIPLATFORM
  68 int _machine = 0;
  69 EXPORT_SYMBOL(_machine);
  70 #endif
  71
  72 unsigned long klimit = (unsigned long) _end;
  73
  74 /*
  75  * This still seems to be needed... -- paulus
  76  */
  77 struct screen_info screen_info = {
  78         .orig_x = 0,
  79         .orig_y = 25,
  80         .orig_video_cols = 80,
  81         .orig_video_lines = 25,
  82         .orig_video_isVGA = 1,
  83         .orig_video_points = 16
  84 };
  85
  86 #ifdef __DO_IRQ_CANON
  87 /* XXX should go elsewhere eventually */
  88 int ppc_do_canonicalize_irqs;
  89 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  90 #endif
  91
  92 /* also used by kexec */
  93 void machine_shutdown(void)
  94 {
  95         if (ppc_md.nvram_sync)
  96                 ppc_md.nvram_sync();
  97 }
  98
  99 void machine_restart(char *cmd)
 100 {
 101         machine_shutdown();
 102         ppc_md.restart(cmd);
 103 #ifdef CONFIG_SMP
 104         smp_send_stop();
 105 #endif
 106         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 107         local_irq_disable();
 108         while (1) ;
 109 }
 110
 111 void machine_power_off(void)
 112 {
 113         machine_shutdown();
 114         ppc_md.power_off();
 115 #ifdef CONFIG_SMP
 116         smp_send_stop();
 117 #endif
 118         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 119         local_irq_disable();
 120         while (1) ;
 121 }
 122 /* Used by the G5 thermal driver */
 123 EXPORT_SYMBOL_GPL(machine_power_off);
 124
 125 void (*pm_power_off)(void) = machine_power_off;
 126 EXPORT_SYMBOL_GPL(pm_power_off);
 127
 128 void machine_halt(void)
 129 {
 130         machine_shutdown();
 131         ppc_md.halt();
 132 #ifdef CONFIG_SMP
 133         smp_send_stop();
 134 #endif
 135         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 136         local_irq_disable();
 137         while (1) ;
 138 }
 139
 140
 141 #ifdef CONFIG_TAU
 142 extern u32 cpu_temp(unsigned long cpu);
 143 extern u32 cpu_temp_both(unsigned long cpu);
 144 #endif /* CONFIG_TAU */
 145
 146 #ifdef CONFIG_SMP
 147 DEFINE_PER_CPU(unsigned int, pvr);
 148 #endif
 149
 150 static int show_cpuinfo(struct seq_file *m, void *v)
 151 {
 152         unsigned long cpu_id = (unsigned long)v - 1;
 153         unsigned int pvr;
 154         unsigned short maj;
 155         unsigned short min;
 156
 157         if (cpu_id == NR_CPUS) {
 158 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 159                 unsigned long bogosum = 0;
 160                 int i;
 161                 for (i = 0; i < NR_CPUS; ++i)
 162                         if (cpu_online(i))
 163                                 bogosum += loops_per_jiffy;
 164                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 165                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 166 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 167                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 168
 169                 if (ppc_md.show_cpuinfo != NULL)
 170                         ppc_md.show_cpuinfo(m);
 171
 172                 return 0;
 173         }
 174
 175         /* We only show online cpus: disable preempt (overzealous, I
 176          * knew) to prevent cpu going down. */
 177         preempt_disable();
 178         if (!cpu_online(cpu_id)) {
 179                 preempt_enable();
 180                 return 0;
 181         }
 182
 183 #ifdef CONFIG_SMP
 184         pvr = per_cpu(pvr, cpu_id);
 185 #else
 186         pvr = mfspr(SPRN_PVR);
 187 #endif
 188         maj = (pvr >> 8) & 0xFF;
 189         min = pvr & 0xFF;
 190
 191         seq_printf(m, "processor\t: %lu\n", cpu_id);
 192         seq_printf(m, "cpu\t\t: ");
 193
 194         if (cur_cpu_spec->pvr_mask)
 195                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 196         else
 197                 seq_printf(m, "unknown (%08x)", pvr);
 198
 199 #ifdef CONFIG_ALTIVEC
 200         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 201                 seq_printf(m, ", altivec supported");
 202 #endif /* CONFIG_ALTIVEC */
 203
 204         seq_printf(m, "\n");
 205
 206 #ifdef CONFIG_TAU
 207         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 208 #ifdef CONFIG_TAU_AVERAGE
 209                 /* more straightforward, but potentially misleading */
 210                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 211                            cpu_temp(cpu_id));
 212 #else
 213                 /* show the actual temp sensor range */
 214                 u32 temp;
 215                 temp = cpu_temp_both(cpu_id);
 216                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 217                            temp & 0xff, temp >> 16);
 218 #endif
 219         }
 220 #endif /* CONFIG_TAU */
 221
 222         /*
 223          * Assume here that all clock rates are the same in a
 224          * smp system.  -- Cort
 225          */
 226         if (ppc_proc_freq)
 227                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 228                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 229
 230         if (ppc_md.show_percpuinfo != NULL)
 231                 ppc_md.show_percpuinfo(m, cpu_id);
 232
 233         /* If we are a Freescale core do a simple check so
 234          * we dont have to keep adding cases in the future */
 235         if (PVR_VER(pvr) & 0x8000) {
 236                 maj = PVR_MAJ(pvr);
 237                 min = PVR_MIN(pvr);
 238         } else {
 239                 switch (PVR_VER(pvr)) {
 240                         case 0x0020:    /* 403 family */
 241                                 maj = PVR_MAJ(pvr) + 1;
 242                                 min = PVR_MIN(pvr);
 243                                 break;
 244                         case 0x1008:    /* 740P/750P ?? */
 245                                 maj = ((pvr >> 8) & 0xFF) - 1;
 246                                 min = pvr & 0xFF;
 247                                 break;
 248                         default:
 249                                 maj = (pvr >> 8) & 0xFF;
 250                                 min = pvr & 0xFF;
 251                                 break;
 252                 }
 253         }
 254
 255         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 256                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 257
 258 #ifdef CONFIG_PPC32
 259         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 260                    loops_per_jiffy / (500000/HZ),
 261                    (loops_per_jiffy / (5000/HZ)) % 100);
 262 #endif
 263
 264 #ifdef CONFIG_SMP
 265         seq_printf(m, "\n");
 266 #endif
 267
 268         preempt_enable();
 269         return 0;
 270 }
 271
 272 static void *c_start(struct seq_file *m, loff_t *pos)
 273 {
 274         unsigned long i = *pos;
 275
 276         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 277 }
 278
 279 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 280 {
 281         ++*pos;
 282         return c_start(m, pos);
 283 }
 284
 285 static void c_stop(struct seq_file *m, void *v)
 286 {
 287 }
 288
 289 struct seq_operations cpuinfo_op = {
 290         .start =c_start,
 291         .next = c_next,
 292         .stop = c_stop,
 293         .show = show_cpuinfo,
 294 };
 295
 296 #ifdef CONFIG_PPC_MULTIPLATFORM
 297 static int __init set_preferred_console(void)
 298 {
 299         struct device_node *prom_stdout = NULL;
 300         char *name;
 301         u32 *spd;
 302         int offset = 0;
 303
 304         DBG(" -> set_preferred_console()\n");
 305
 306         /* The user has requested a console so this is already set up. */
 307         if (strstr(saved_command_line, "console=")) {
 308                 DBG(" console was specified !\n");
 309                 return -EBUSY;
 310         }
 311
 312         if (!of_chosen) {
 313                 DBG(" of_chosen is NULL !\n");
 314                 return -ENODEV;
 315         }
 316         /* We are getting a weird phandle from OF ... */
 317         /* ... So use the full path instead */
 318         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 319         if (name == NULL) {
 320                 DBG(" no linux,stdout-path !\n");
 321                 return -ENODEV;
 322         }
 323         prom_stdout = of_find_node_by_path(name);
 324         if (!prom_stdout) {
 325                 DBG(" can't find stdout package %s !\n", name);
 326                 return -ENODEV;
 327         }
 328         DBG("stdout is %s\n", prom_stdout->full_name);
 329
 330         name = (char *)get_property(prom_stdout, "name", NULL);
 331         if (!name) {
 332                 DBG(" stdout package has no name !\n");
 333                 goto not_found;
 334         }
 335         spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
 336
 337         if (0)
 338                 ;
 339 #ifdef CONFIG_SERIAL_8250_CONSOLE
 340         else if (strcmp(name, "serial") == 0) {
 341                 int i;
 342                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 343                 if (i > 8) {
 344                         switch (reg[1]) {
 345                                 case 0x3f8:
 346                                         offset = 0;
 347                                         break;
 348                                 case 0x2f8:
 349                                         offset = 1;
 350                                         break;
 351                                 case 0x898:
 352                                         offset = 2;
 353                                         break;
 354                                 case 0x890:
 355                                         offset = 3;
 356                                         break;
 357                                 default:
 358                                         /* We dont recognise the serial port */
 359                                         goto not_found;
 360                         }
 361                 }
 362         }
 363 #endif /* CONFIG_SERIAL_8250_CONSOLE */
 364 #ifdef CONFIG_PPC_PSERIES
 365         else if (strcmp(name, "vty") == 0) {
 366                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
 367                 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
 368
 369                 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
 370                         /* Host Virtual Serial Interface */
 371                         switch (reg[0]) {
 372                                 case 0x30000000:
 373                                         offset = 0;
 374                                         break;
 375                                 case 0x30000001:
 376                                         offset = 1;
 377                                         break;
 378                                 default:
 379                                         goto not_found;
 380                         }
 381                         of_node_put(prom_stdout);
 382                         DBG("Found hvsi console at offset %d\n", offset);
 383                         return add_preferred_console("hvsi", offset, NULL);
 384                 } else {
 385                         /* pSeries LPAR virtual console */
 386                         of_node_put(prom_stdout);
 387                         DBG("Found hvc console\n");
 388                         return add_preferred_console("hvc", 0, NULL);
 389                 }
 390         }
 391 #endif /* CONFIG_PPC_PSERIES */
 392 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 393         else if (strcmp(name, "ch-a") == 0)
 394                 offset = 0;
 395         else if (strcmp(name, "ch-b") == 0)
 396                 offset = 1;
 397 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 398         else
 399                 goto not_found;
 400         of_node_put(prom_stdout);
 401
 402         DBG("Found serial console at ttyS%d\n", offset);
 403
 404         if (spd) {
 405                 static char __initdata opt[16];
 406                 sprintf(opt, "%d", *spd);
 407                 return add_preferred_console("ttyS", offset, opt);
 408         } else
 409                 return add_preferred_console("ttyS", offset, NULL);
 410
 411  not_found:
 412         DBG("No preferred console found !\n");
 413         of_node_put(prom_stdout);
 414         return -ENODEV;
 415 }
 416 console_initcall(set_preferred_console);
 417 #endif /* CONFIG_PPC_MULTIPLATFORM */
 418
 419 void __init check_for_initrd(void)
 420 {
 421 #ifdef CONFIG_BLK_DEV_INITRD
 422         unsigned long *prop;
 423
 424         DBG(" -> check_for_initrd()\n");
 425
 426         if (of_chosen) {
 427                 prop = (unsigned long *)get_property(of_chosen,
 428                                 "linux,initrd-start", NULL);
 429                 if (prop != NULL) {
 430                         initrd_start = (unsigned long)__va(*prop);
 431                         prop = (unsigned long *)get_property(of_chosen,
 432                                         "linux,initrd-end", NULL);
 433                         if (prop != NULL) {
 434                                 initrd_end = (unsigned long)__va(*prop);
 435                                 initrd_below_start_ok = 1;
 436                         } else
 437                                 initrd_start = 0;
 438                 }
 439         }
 440
 441         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 442          * look sensible. If not, clear initrd reference.
 443          */
 444         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 445             initrd_end > initrd_start)
 446                 ROOT_DEV = Root_RAM0;
 447         else
 448                 initrd_start = initrd_end = 0;
 449
 450         if (initrd_start)
 451                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 452
 453         DBG(" <- check_for_initrd()\n");
 454 #endif /* CONFIG_BLK_DEV_INITRD */
 455 }
 456
 457 #ifdef CONFIG_SMP
 458
 459 /**
 460  * setup_cpu_maps - initialize the following cpu maps:
 461  *                  cpu_possible_map
 462  *                  cpu_present_map
 463  *                  cpu_sibling_map
 464  *
 465  * Having the possible map set up early allows us to restrict allocations
 466  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 467  *
 468  * We do not initialize the online map here; cpus set their own bits in
 469  * cpu_online_map as they come up.
 470  *
 471  * This function is valid only for Open Firmware systems.  finish_device_tree
 472  * must be called before using this.
 473  *
 474  * While we're here, we may as well set the "physical" cpu ids in the paca.
 475  */
 476 void __init smp_setup_cpu_maps(void)
 477 {
 478         struct device_node *dn = NULL;
 479         int cpu = 0;
 480         int swap_cpuid = 0;
 481
 482         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 483                 int *intserv;
 484                 int j, len = sizeof(u32), nthreads = 1;
 485
 486                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 487                                               &len);
 488                 if (intserv)
 489                         nthreads = len / sizeof(int);
 490                 else {
 491                         intserv = (int *) get_property(dn, "reg", NULL);
 492                         if (!intserv)
 493                                 intserv = &cpu; /* assume logical == phys */
 494                 }
 495
 496                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 497                         cpu_set(cpu, cpu_present_map);
 498                         set_hard_smp_processor_id(cpu, intserv[j]);
 499
 500                         if (intserv[j] == boot_cpuid_phys)
 501                                 swap_cpuid = cpu;
 502                         cpu_set(cpu, cpu_possible_map);
 503                         cpu++;
 504                 }
 505         }
 506
 507         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
 508          * boot cpu is logical 0.
 509          */
 510         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
 511                 u32 tmp;
 512                 tmp = get_hard_smp_processor_id(0);
 513                 set_hard_smp_processor_id(0, boot_cpuid_phys);
 514                 set_hard_smp_processor_id(swap_cpuid, tmp);
 515         }
 516
 517 #ifdef CONFIG_PPC64
 518         /*
 519          * On pSeries LPAR, we need to know how many cpus
 520          * could possibly be added to this partition.
 521          */
 522         if (_machine == PLATFORM_PSERIES_LPAR &&
 523             (dn = of_find_node_by_path("/rtas"))) {
 524                 int num_addr_cell, num_size_cell, maxcpus;
 525                 unsigned int *ireg;
 526
 527                 num_addr_cell = prom_n_addr_cells(dn);
 528                 num_size_cell = prom_n_size_cells(dn);
 529
 530                 ireg = (unsigned int *)
 531                         get_property(dn, "ibm,lrdr-capacity", NULL);
 532
 533                 if (!ireg)
 534                         goto out;
 535
 536                 maxcpus = ireg[num_addr_cell + num_size_cell];
 537
 538                 /* Double maxcpus for processors which have SMT capability */
 539                 if (cpu_has_feature(CPU_FTR_SMT))
 540                         maxcpus *= 2;
 541
 542                 if (maxcpus > NR_CPUS) {
 543                         printk(KERN_WARNING
 544                                "Partition configured for %d cpus, "
 545                                "operating system maximum is %d.\n",
 546                                maxcpus, NR_CPUS);
 547                         maxcpus = NR_CPUS;
 548                 } else
 549                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 550                                maxcpus);
 551
 552                 for (cpu = 0; cpu < maxcpus; cpu++)
 553                         cpu_set(cpu, cpu_possible_map);
 554         out:
 555                 of_node_put(dn);
 556         }
 557
 558         /*
 559          * Do the sibling map; assume only two threads per processor.
 560          */
 561         for_each_cpu(cpu) {
 562                 cpu_set(cpu, cpu_sibling_map[cpu]);
 563                 if (cpu_has_feature(CPU_FTR_SMT))
 564                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 565         }
 566
 567         vdso_data->processorCount = num_present_cpus();
 568 #endif /* CONFIG_PPC64 */
 569 }
 570 #endif /* CONFIG_SMP */
 571
 572 #ifdef CONFIG_XMON
 573 static int __init early_xmon(char *p)
 574 {
 575         /* ensure xmon is enabled */
 576         if (p) {
 577                 if (strncmp(p, "on", 2) == 0)
 578                         xmon_init(1);
 579                 if (strncmp(p, "off", 3) == 0)
 580                         xmon_init(0);
 581                 if (strncmp(p, "early", 5) != 0)
 582                         return 0;
 583         }
 584         xmon_init(1);
 585         debugger(NULL);
 586
 587         return 0;
 588 }
 589 early_param("xmon", early_xmon);
 590 #endif