git.oblomov.eu Git - linux-2.6/blob - 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
  55 #undef DEBUG
  56
  57 #ifdef DEBUG
  58 #define DBG(fmt...) udbg_printf(fmt)
  59 #else
  60 #define DBG(fmt...)
  61 #endif
  62
  63 /*
  64  * This still seems to be needed... -- paulus
  65  */
  66 struct screen_info screen_info = {
  67         .orig_x = 0,
  68         .orig_y = 25,
  69         .orig_video_cols = 80,
  70         .orig_video_lines = 25,
  71         .orig_video_isVGA = 1,
  72         .orig_video_points = 16
  73 };
  74
  75 #ifdef __DO_IRQ_CANON
  76 /* XXX should go elsewhere eventually */
  77 int ppc_do_canonicalize_irqs;
  78 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  79 #endif
  80
  81 /* also used by kexec */
  82 void machine_shutdown(void)
  83 {
  84         if (ppc_md.nvram_sync)
  85                 ppc_md.nvram_sync();
  86 }
  87
  88 void machine_restart(char *cmd)
  89 {
  90         machine_shutdown();
  91         ppc_md.restart(cmd);
  92 #ifdef CONFIG_SMP
  93         smp_send_stop();
  94 #endif
  95         printk(KERN_EMERG "System Halted, OK to turn off power\n");
  96         local_irq_disable();
  97         while (1) ;
  98 }
  99
 100 void machine_power_off(void)
 101 {
 102         machine_shutdown();
 103         ppc_md.power_off();
 104 #ifdef CONFIG_SMP
 105         smp_send_stop();
 106 #endif
 107         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 108         local_irq_disable();
 109         while (1) ;
 110 }
 111 /* Used by the G5 thermal driver */
 112 EXPORT_SYMBOL_GPL(machine_power_off);
 113
 114 void (*pm_power_off)(void) = machine_power_off;
 115 EXPORT_SYMBOL_GPL(pm_power_off);
 116
 117 void machine_halt(void)
 118 {
 119         machine_shutdown();
 120         ppc_md.halt();
 121 #ifdef CONFIG_SMP
 122         smp_send_stop();
 123 #endif
 124         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 125         local_irq_disable();
 126         while (1) ;
 127 }
 128
 129
 130 #ifdef CONFIG_TAU
 131 extern u32 cpu_temp(unsigned long cpu);
 132 extern u32 cpu_temp_both(unsigned long cpu);
 133 #endif /* CONFIG_TAU */
 134
 135 #ifdef CONFIG_SMP
 136 DEFINE_PER_CPU(unsigned int, pvr);
 137 #endif
 138
 139 static int show_cpuinfo(struct seq_file *m, void *v)
 140 {
 141         unsigned long cpu_id = (unsigned long)v - 1;
 142         unsigned int pvr;
 143         unsigned short maj;
 144         unsigned short min;
 145
 146         if (cpu_id == NR_CPUS) {
 147 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 148                 unsigned long bogosum = 0;
 149                 int i;
 150                 for (i = 0; i < NR_CPUS; ++i)
 151                         if (cpu_online(i))
 152                                 bogosum += loops_per_jiffy;
 153                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 154                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 155 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 156                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 157
 158                 if (ppc_md.show_cpuinfo != NULL)
 159                         ppc_md.show_cpuinfo(m);
 160
 161                 return 0;
 162         }
 163
 164         /* We only show online cpus: disable preempt (overzealous, I
 165          * knew) to prevent cpu going down. */
 166         preempt_disable();
 167         if (!cpu_online(cpu_id)) {
 168                 preempt_enable();
 169                 return 0;
 170         }
 171
 172 #ifdef CONFIG_SMP
 173         pvr = per_cpu(pvr, cpu_id);
 174 #else
 175         pvr = mfspr(SPRN_PVR);
 176 #endif
 177         maj = (pvr >> 8) & 0xFF;
 178         min = pvr & 0xFF;
 179
 180         seq_printf(m, "processor\t: %lu\n", cpu_id);
 181         seq_printf(m, "cpu\t\t: ");
 182
 183         if (cur_cpu_spec->pvr_mask)
 184                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 185         else
 186                 seq_printf(m, "unknown (%08x)", pvr);
 187
 188 #ifdef CONFIG_ALTIVEC
 189         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 190                 seq_printf(m, ", altivec supported");
 191 #endif /* CONFIG_ALTIVEC */
 192
 193         seq_printf(m, "\n");
 194
 195 #ifdef CONFIG_TAU
 196         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 197 #ifdef CONFIG_TAU_AVERAGE
 198                 /* more straightforward, but potentially misleading */
 199                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 200                            cpu_temp(cpu_id));
 201 #else
 202                 /* show the actual temp sensor range */
 203                 u32 temp;
 204                 temp = cpu_temp_both(cpu_id);
 205                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 206                            temp & 0xff, temp >> 16);
 207 #endif
 208         }
 209 #endif /* CONFIG_TAU */
 210
 211         /*
 212          * Assume here that all clock rates are the same in a
 213          * smp system.  -- Cort
 214          */
 215         if (ppc_proc_freq)
 216                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 217                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 218
 219         if (ppc_md.show_percpuinfo != NULL)
 220                 ppc_md.show_percpuinfo(m, cpu_id);
 221
 222         /* If we are a Freescale core do a simple check so
 223          * we dont have to keep adding cases in the future */
 224         if (PVR_VER(pvr) & 0x8000) {
 225                 maj = PVR_MAJ(pvr);
 226                 min = PVR_MIN(pvr);
 227         } else {
 228                 switch (PVR_VER(pvr)) {
 229                         case 0x0020:    /* 403 family */
 230                                 maj = PVR_MAJ(pvr) + 1;
 231                                 min = PVR_MIN(pvr);
 232                                 break;
 233                         case 0x1008:    /* 740P/750P ?? */
 234                                 maj = ((pvr >> 8) & 0xFF) - 1;
 235                                 min = pvr & 0xFF;
 236                                 break;
 237                         default:
 238                                 maj = (pvr >> 8) & 0xFF;
 239                                 min = pvr & 0xFF;
 240                                 break;
 241                 }
 242         }
 243
 244         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 245                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 246
 247 #ifdef CONFIG_PPC32
 248         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 249                    loops_per_jiffy / (500000/HZ),
 250                    (loops_per_jiffy / (5000/HZ)) % 100);
 251 #endif
 252
 253 #ifdef CONFIG_SMP
 254         seq_printf(m, "\n");
 255 #endif
 256
 257         preempt_enable();
 258         return 0;
 259 }
 260
 261 static void *c_start(struct seq_file *m, loff_t *pos)
 262 {
 263         unsigned long i = *pos;
 264
 265         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 266 }
 267
 268 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 269 {
 270         ++*pos;
 271         return c_start(m, pos);
 272 }
 273
 274 static void c_stop(struct seq_file *m, void *v)
 275 {
 276 }
 277
 278 struct seq_operations cpuinfo_op = {
 279         .start =c_start,
 280         .next = c_next,
 281         .stop = c_stop,
 282         .show = show_cpuinfo,
 283 };
 284
 285 #ifdef CONFIG_PPC_MULTIPLATFORM
 286 static int __init set_preferred_console(void)
 287 {
 288         struct device_node *prom_stdout = NULL;
 289         char *name;
 290         u32 *spd;
 291         int offset = 0;
 292
 293         DBG(" -> set_preferred_console()\n");
 294
 295         /* The user has requested a console so this is already set up. */
 296         if (strstr(saved_command_line, "console=")) {
 297                 DBG(" console was specified !\n");
 298                 return -EBUSY;
 299         }
 300
 301         if (!of_chosen) {
 302                 DBG(" of_chosen is NULL !\n");
 303                 return -ENODEV;
 304         }
 305         /* We are getting a weird phandle from OF ... */
 306         /* ... So use the full path instead */
 307         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 308         if (name == NULL) {
 309                 DBG(" no linux,stdout-path !\n");
 310                 return -ENODEV;
 311         }
 312         prom_stdout = of_find_node_by_path(name);
 313         if (!prom_stdout) {
 314                 DBG(" can't find stdout package %s !\n", name);
 315                 return -ENODEV;
 316         }
 317         DBG("stdout is %s\n", prom_stdout->full_name);
 318
 319         name = (char *)get_property(prom_stdout, "name", NULL);
 320         if (!name) {
 321                 DBG(" stdout package has no name !\n");
 322                 goto not_found;
 323         }
 324         spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
 325
 326         if (0)
 327                 ;
 328 #ifdef CONFIG_SERIAL_8250_CONSOLE
 329         else if (strcmp(name, "serial") == 0) {
 330                 int i;
 331                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 332                 if (i > 8) {
 333                         switch (reg[1]) {
 334                                 case 0x3f8:
 335                                         offset = 0;
 336                                         break;
 337                                 case 0x2f8:
 338                                         offset = 1;
 339                                         break;
 340                                 case 0x898:
 341                                         offset = 2;
 342                                         break;
 343                                 case 0x890:
 344                                         offset = 3;
 345                                         break;
 346                                 default:
 347                                         /* We dont recognise the serial port */
 348                                         goto not_found;
 349                         }
 350                 }
 351         }
 352 #endif /* CONFIG_SERIAL_8250_CONSOLE */
 353 #ifdef CONFIG_PPC_PSERIES
 354         else if (strcmp(name, "vty") == 0) {
 355                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
 356                 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
 357
 358                 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
 359                         /* Host Virtual Serial Interface */
 360                         switch (reg[0]) {
 361                                 case 0x30000000:
 362                                         offset = 0;
 363                                         break;
 364                                 case 0x30000001:
 365                                         offset = 1;
 366                                         break;
 367                                 default:
 368                                         goto not_found;
 369                         }
 370                         of_node_put(prom_stdout);
 371                         DBG("Found hvsi console at offset %d\n", offset);
 372                         return add_preferred_console("hvsi", offset, NULL);
 373                 } else {
 374                         /* pSeries LPAR virtual console */
 375                         of_node_put(prom_stdout);
 376                         DBG("Found hvc console\n");
 377                         return add_preferred_console("hvc", 0, NULL);
 378                 }
 379         }
 380 #endif /* CONFIG_PPC_PSERIES */
 381 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 382         else if (strcmp(name, "ch-a") == 0)
 383                 offset = 0;
 384         else if (strcmp(name, "ch-b") == 0)
 385                 offset = 1;
 386 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 387         else
 388                 goto not_found;
 389         of_node_put(prom_stdout);
 390
 391         DBG("Found serial console at ttyS%d\n", offset);
 392
 393         if (spd) {
 394                 static char __initdata opt[16];
 395                 sprintf(opt, "%d", *spd);
 396                 return add_preferred_console("ttyS", offset, opt);
 397         } else
 398                 return add_preferred_console("ttyS", offset, NULL);
 399
 400  not_found:
 401         DBG("No preferred console found !\n");
 402         of_node_put(prom_stdout);
 403         return -ENODEV;
 404 }
 405 console_initcall(set_preferred_console);
 406 #endif /* CONFIG_PPC_MULTIPLATFORM */
 407
 408 void __init check_for_initrd(void)
 409 {
 410 #ifdef CONFIG_BLK_DEV_INITRD
 411         unsigned long *prop;
 412
 413         DBG(" -> check_for_initrd()\n");
 414
 415         if (of_chosen) {
 416                 prop = (unsigned long *)get_property(of_chosen,
 417                                 "linux,initrd-start", NULL);
 418                 if (prop != NULL) {
 419                         initrd_start = (unsigned long)__va(*prop);
 420                         prop = (unsigned long *)get_property(of_chosen,
 421                                         "linux,initrd-end", NULL);
 422                         if (prop != NULL) {
 423                                 initrd_end = (unsigned long)__va(*prop);
 424                                 initrd_below_start_ok = 1;
 425                         } else
 426                                 initrd_start = 0;
 427                 }
 428         }
 429
 430         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 431          * look sensible. If not, clear initrd reference.
 432          */
 433         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 434             initrd_end > initrd_start)
 435                 ROOT_DEV = Root_RAM0;
 436         else {
 437                 printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
 438                 initrd_start = initrd_end = 0;
 439         }
 440
 441         if (initrd_start)
 442                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 443
 444         DBG(" <- check_for_initrd()\n");
 445 #endif /* CONFIG_BLK_DEV_INITRD */
 446 }
 447
 448 #ifdef CONFIG_SMP
 449
 450 /**
 451  * setup_cpu_maps - initialize the following cpu maps:
 452  *                  cpu_possible_map
 453  *                  cpu_present_map
 454  *                  cpu_sibling_map
 455  *
 456  * Having the possible map set up early allows us to restrict allocations
 457  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 458  *
 459  * We do not initialize the online map here; cpus set their own bits in
 460  * cpu_online_map as they come up.
 461  *
 462  * This function is valid only for Open Firmware systems.  finish_device_tree
 463  * must be called before using this.
 464  *
 465  * While we're here, we may as well set the "physical" cpu ids in the paca.
 466  */
 467 void __init smp_setup_cpu_maps(void)
 468 {
 469         struct device_node *dn = NULL;
 470         int cpu = 0;
 471         int swap_cpuid = 0;
 472
 473         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 474                 int *intserv;
 475                 int j, len = sizeof(u32), nthreads = 1;
 476
 477                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 478                                               &len);
 479                 if (intserv)
 480                         nthreads = len / sizeof(int);
 481                 else {
 482                         intserv = (int *) get_property(dn, "reg", NULL);
 483                         if (!intserv)
 484                                 intserv = &cpu; /* assume logical == phys */
 485                 }
 486
 487                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 488                         cpu_set(cpu, cpu_present_map);
 489                         set_hard_smp_processor_id(cpu, intserv[j]);
 490
 491                         if (intserv[j] == boot_cpuid_phys)
 492                                 swap_cpuid = cpu;
 493                         cpu_set(cpu, cpu_possible_map);
 494                         cpu++;
 495                 }
 496         }
 497
 498         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
 499          * boot cpu is logical 0.
 500          */
 501         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
 502                 u32 tmp;
 503                 tmp = get_hard_smp_processor_id(0);
 504                 set_hard_smp_processor_id(0, boot_cpuid_phys);
 505                 set_hard_smp_processor_id(swap_cpuid, tmp);
 506         }
 507
 508 #ifdef CONFIG_PPC64
 509         /*
 510          * On pSeries LPAR, we need to know how many cpus
 511          * could possibly be added to this partition.
 512          */
 513         if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
 514                                 (dn = of_find_node_by_path("/rtas"))) {
 515                 int num_addr_cell, num_size_cell, maxcpus;
 516                 unsigned int *ireg;
 517
 518                 num_addr_cell = prom_n_addr_cells(dn);
 519                 num_size_cell = prom_n_size_cells(dn);
 520
 521                 ireg = (unsigned int *)
 522                         get_property(dn, "ibm,lrdr-capacity", NULL);
 523
 524                 if (!ireg)
 525                         goto out;
 526
 527                 maxcpus = ireg[num_addr_cell + num_size_cell];
 528
 529                 /* Double maxcpus for processors which have SMT capability */
 530                 if (cpu_has_feature(CPU_FTR_SMT))
 531                         maxcpus *= 2;
 532
 533                 if (maxcpus > NR_CPUS) {
 534                         printk(KERN_WARNING
 535                                "Partition configured for %d cpus, "
 536                                "operating system maximum is %d.\n",
 537                                maxcpus, NR_CPUS);
 538                         maxcpus = NR_CPUS;
 539                 } else
 540                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 541                                maxcpus);
 542
 543                 for (cpu = 0; cpu < maxcpus; cpu++)
 544                         cpu_set(cpu, cpu_possible_map);
 545         out:
 546                 of_node_put(dn);
 547         }
 548
 549         /*
 550          * Do the sibling map; assume only two threads per processor.
 551          */
 552         for_each_cpu(cpu) {
 553                 cpu_set(cpu, cpu_sibling_map[cpu]);
 554                 if (cpu_has_feature(CPU_FTR_SMT))
 555                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 556         }
 557
 558         systemcfg->processorCount = num_present_cpus();
 559 #endif /* CONFIG_PPC64 */
 560 }
 561 #endif /* CONFIG_SMP */