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