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