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