release/src-rt-6.x/linux/linux-2.6/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
  13 #undef DEBUG
  14
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/sched.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/reboot.h>
  21 #include <linux/delay.h>
  22 #include <linux/initrd.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/ioport.h>
  26 #include <linux/console.h>
  27 #include <linux/utsname.h>
  28 #include <linux/screen_info.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/notifier.h>
  31 #include <linux/cpu.h>
  32 #include <linux/unistd.h>
  33 #include <linux/serial.h>
  34 #include <linux/serial_8250.h>
  35 #include <asm/io.h>
  36 #include <asm/prom.h>
  37 #include <asm/processor.h>
  38 #include <asm/vdso_datapage.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/smp.h>
  41 #include <asm/elf.h>
  42 #include <asm/machdep.h>
  43 #include <asm/time.h>
  44 #include <asm/cputable.h>
  45 #include <asm/sections.h>
  46 #include <asm/firmware.h>
  47 #include <asm/btext.h>
  48 #include <asm/nvram.h>
  49 #include <asm/setup.h>
  50 #include <asm/system.h>
  51 #include <asm/rtas.h>
  52 #include <asm/iommu.h>
  53 #include <asm/serial.h>
  54 #include <asm/cache.h>
  55 #include <asm/page.h>
  56 #include <asm/mmu.h>
  57 #include <asm/lmb.h>
  58 #include <asm/xmon.h>
  59
  60 #include "setup.h"
  61
  62 #ifdef DEBUG
  63 #include <asm/udbg.h>
  64 #define DBG(fmt...) udbg_printf(fmt)
  65 #else
  66 #define DBG(fmt...)
  67 #endif
  68
  69 /* The main machine-dep calls structure
  70  */
  71 struct machdep_calls ppc_md;
  72 EXPORT_SYMBOL(ppc_md);
  73 struct machdep_calls *machine_id;
  74 EXPORT_SYMBOL(machine_id);
  75
  76 unsigned long klimit = (unsigned long) _end;
  77
  78 /*
  79  * This still seems to be needed... -- paulus
  80  */
  81 struct screen_info screen_info = {
  82         .orig_x = 0,
  83         .orig_y = 25,
  84         .orig_video_cols = 80,
  85         .orig_video_lines = 25,
  86         .orig_video_isVGA = 1,
  87         .orig_video_points = 16
  88 };
  89
  90 #ifdef __DO_IRQ_CANON
  91 /* XXX should go elsewhere eventually */
  92 int ppc_do_canonicalize_irqs;
  93 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  94 #endif
  95
  96 /* also used by kexec */
  97 void machine_shutdown(void)
  98 {
  99         if (ppc_md.machine_shutdown)
 100                 ppc_md.machine_shutdown();
 101 }
 102
 103 void machine_restart(char *cmd)
 104 {
 105         machine_shutdown();
 106         if (ppc_md.restart)
 107                 ppc_md.restart(cmd);
 108 #ifdef CONFIG_SMP
 109         smp_send_stop();
 110 #endif
 111         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 112         local_irq_disable();
 113         while (1) ;
 114 }
 115
 116 void machine_power_off(void)
 117 {
 118         machine_shutdown();
 119         if (ppc_md.power_off)
 120                 ppc_md.power_off();
 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 /* Used by the G5 thermal driver */
 129 EXPORT_SYMBOL_GPL(machine_power_off);
 130
 131 void (*pm_power_off)(void) = machine_power_off;
 132 EXPORT_SYMBOL_GPL(pm_power_off);
 133
 134 void machine_halt(void)
 135 {
 136         machine_shutdown();
 137         if (ppc_md.halt)
 138                 ppc_md.halt();
 139 #ifdef CONFIG_SMP
 140         smp_send_stop();
 141 #endif
 142         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 143         local_irq_disable();
 144         while (1) ;
 145 }
 146
 147
 148 #ifdef CONFIG_TAU
 149 extern u32 cpu_temp(unsigned long cpu);
 150 extern u32 cpu_temp_both(unsigned long cpu);
 151 #endif /* CONFIG_TAU */
 152
 153 #ifdef CONFIG_SMP
 154 DEFINE_PER_CPU(unsigned int, pvr);
 155 #endif
 156
 157 static int show_cpuinfo(struct seq_file *m, void *v)
 158 {
 159         unsigned long cpu_id = (unsigned long)v - 1;
 160         unsigned int pvr;
 161         unsigned short maj;
 162         unsigned short min;
 163
 164         if (cpu_id == NR_CPUS) {
 165 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 166                 unsigned long bogosum = 0;
 167                 int i;
 168                 for_each_online_cpu(i)
 169                         bogosum += loops_per_jiffy;
 170                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 171                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 172 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 173                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 174                 if (ppc_md.name)
 175                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 176                 if (ppc_md.show_cpuinfo != NULL)
 177                         ppc_md.show_cpuinfo(m);
 178
 179                 return 0;
 180         }
 181
 182         /* We only show online cpus: disable preempt (overzealous, I
 183          * knew) to prevent cpu going down. */
 184         preempt_disable();
 185         if (!cpu_online(cpu_id)) {
 186                 preempt_enable();
 187                 return 0;
 188         }
 189
 190 #ifdef CONFIG_SMP
 191         pvr = per_cpu(pvr, cpu_id);
 192 #else
 193         pvr = mfspr(SPRN_PVR);
 194 #endif
 195         maj = (pvr >> 8) & 0xFF;
 196         min = pvr & 0xFF;
 197
 198         seq_printf(m, "processor\t: %lu\n", cpu_id);
 199         seq_printf(m, "cpu\t\t: ");
 200
 201         if (cur_cpu_spec->pvr_mask)
 202                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 203         else
 204                 seq_printf(m, "unknown (%08x)", pvr);
 205
 206 #ifdef CONFIG_ALTIVEC
 207         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 208                 seq_printf(m, ", altivec supported");
 209 #endif /* CONFIG_ALTIVEC */
 210
 211         seq_printf(m, "\n");
 212
 213 #ifdef CONFIG_TAU
 214         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 215 #ifdef CONFIG_TAU_AVERAGE
 216                 /* more straightforward, but potentially misleading */
 217                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 218                            cpu_temp(cpu_id));
 219 #else
 220                 /* show the actual temp sensor range */
 221                 u32 temp;
 222                 temp = cpu_temp_both(cpu_id);
 223                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 224                            temp & 0xff, temp >> 16);
 225 #endif
 226         }
 227 #endif /* CONFIG_TAU */
 228
 229         /*
 230          * Assume here that all clock rates are the same in a
 231          * smp system.  -- Cort
 232          */
 233         if (ppc_proc_freq)
 234                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 235                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 236
 237         if (ppc_md.show_percpuinfo != NULL)
 238                 ppc_md.show_percpuinfo(m, cpu_id);
 239
 240         /* If we are a Freescale core do a simple check so
 241          * we dont have to keep adding cases in the future */
 242         if (PVR_VER(pvr) & 0x8000) {
 243                 maj = PVR_MAJ(pvr);
 244                 min = PVR_MIN(pvr);
 245         } else {
 246                 switch (PVR_VER(pvr)) {
 247                         case 0x0020:    /* 403 family */
 248                                 maj = PVR_MAJ(pvr) + 1;
 249                                 min = PVR_MIN(pvr);
 250                                 break;
 251                         case 0x1008:    /* 740P/750P ?? */
 252                                 maj = ((pvr >> 8) & 0xFF) - 1;
 253                                 min = pvr & 0xFF;
 254                                 break;
 255                         default:
 256                                 maj = (pvr >> 8) & 0xFF;
 257                                 min = pvr & 0xFF;
 258                                 break;
 259                 }
 260         }
 261
 262         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 263                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 264
 265 #ifdef CONFIG_PPC32
 266         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 267                    loops_per_jiffy / (500000/HZ),
 268                    (loops_per_jiffy / (5000/HZ)) % 100);
 269 #endif
 270
 271 #ifdef CONFIG_SMP
 272         seq_printf(m, "\n");
 273 #endif
 274
 275         preempt_enable();
 276         return 0;
 277 }
 278
 279 static void *c_start(struct seq_file *m, loff_t *pos)
 280 {
 281         unsigned long i = *pos;
 282
 283         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 284 }
 285
 286 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 287 {
 288         ++*pos;
 289         return c_start(m, pos);
 290 }
 291
 292 static void c_stop(struct seq_file *m, void *v)
 293 {
 294 }
 295
 296 struct seq_operations cpuinfo_op = {
 297         .start =c_start,
 298         .next = c_next,
 299         .stop = c_stop,
 300         .show = show_cpuinfo,
 301 };
 302
 303 void __init check_for_initrd(void)
 304 {
 305 #ifdef CONFIG_BLK_DEV_INITRD
 306         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 307             initrd_start, initrd_end);
 308
 309         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 310          * look sensible. If not, clear initrd reference.
 311          */
 312         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 313             initrd_end > initrd_start)
 314                 ROOT_DEV = Root_RAM0;
 315         else
 316                 initrd_start = initrd_end = 0;
 317
 318         if (initrd_start)
 319                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 320
 321         DBG(" <- check_for_initrd()\n");
 322 #endif /* CONFIG_BLK_DEV_INITRD */
 323 }
 324
 325 #ifdef CONFIG_SMP
 326
 327 /**
 328  * setup_cpu_maps - initialize the following cpu maps:
 329  *                  cpu_possible_map
 330  *                  cpu_present_map
 331  *                  cpu_sibling_map
 332  *
 333  * Having the possible map set up early allows us to restrict allocations
 334  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 335  *
 336  * We do not initialize the online map here; cpus set their own bits in
 337  * cpu_online_map as they come up.
 338  *
 339  * This function is valid only for Open Firmware systems.  finish_device_tree
 340  * must be called before using this.
 341  *
 342  * While we're here, we may as well set the "physical" cpu ids in the paca.
 343  *
 344  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 345  */
 346 void __init smp_setup_cpu_maps(void)
 347 {
 348         struct device_node *dn = NULL;
 349         int cpu = 0;
 350
 351         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 352                 const int *intserv;
 353                 int j, len = sizeof(u32), nthreads = 1;
 354
 355                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 356                                 &len);
 357                 if (intserv)
 358                         nthreads = len / sizeof(int);
 359                 else {
 360                         intserv = of_get_property(dn, "reg", NULL);
 361                         if (!intserv)
 362                                 intserv = &cpu; /* assume logical == phys */
 363                 }
 364
 365                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 366                         cpu_set(cpu, cpu_present_map);
 367                         set_hard_smp_processor_id(cpu, intserv[j]);
 368                         cpu_set(cpu, cpu_possible_map);
 369                         cpu++;
 370                 }
 371         }
 372
 373 #ifdef CONFIG_PPC64
 374         /*
 375          * On pSeries LPAR, we need to know how many cpus
 376          * could possibly be added to this partition.
 377          */
 378         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 379             (dn = of_find_node_by_path("/rtas"))) {
 380                 int num_addr_cell, num_size_cell, maxcpus;
 381                 const unsigned int *ireg;
 382
 383                 num_addr_cell = of_n_addr_cells(dn);
 384                 num_size_cell = of_n_size_cells(dn);
 385
 386                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 387
 388                 if (!ireg)
 389                         goto out;
 390
 391                 maxcpus = ireg[num_addr_cell + num_size_cell];
 392
 393                 /* Double maxcpus for processors which have SMT capability */
 394                 if (cpu_has_feature(CPU_FTR_SMT))
 395                         maxcpus *= 2;
 396
 397                 if (maxcpus > NR_CPUS) {
 398                         printk(KERN_WARNING
 399                                "Partition configured for %d cpus, "
 400                                "operating system maximum is %d.\n",
 401                                maxcpus, NR_CPUS);
 402                         maxcpus = NR_CPUS;
 403                 } else
 404                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 405                                maxcpus);
 406
 407                 for (cpu = 0; cpu < maxcpus; cpu++)
 408                         cpu_set(cpu, cpu_possible_map);
 409         out:
 410                 of_node_put(dn);
 411         }
 412
 413         /*
 414          * Do the sibling map; assume only two threads per processor.
 415          */
 416         for_each_possible_cpu(cpu) {
 417                 cpu_set(cpu, cpu_sibling_map[cpu]);
 418                 if (cpu_has_feature(CPU_FTR_SMT))
 419                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 420         }
 421
 422         vdso_data->processorCount = num_present_cpus();
 423 #endif /* CONFIG_PPC64 */
 424 }
 425 #endif /* CONFIG_SMP */
 426
 427 static __init int add_pcspkr(void)
 428 {
 429         struct device_node *np;
 430         struct platform_device *pd;
 431         int ret;
 432
 433         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 434         of_node_put(np);
 435         if (!np)
 436                 return -ENODEV;
 437
 438         pd = platform_device_alloc("pcspkr", -1);
 439         if (!pd)
 440                 return -ENOMEM;
 441
 442         ret = platform_device_add(pd);
 443         if (ret)
 444                 platform_device_put(pd);
 445
 446         return ret;
 447 }
 448 device_initcall(add_pcspkr);
 449
 450 void probe_machine(void)
 451 {
 452         extern struct machdep_calls __machine_desc_start;
 453         extern struct machdep_calls __machine_desc_end;
 454
 455         /*
 456          * Iterate all ppc_md structures until we find the proper
 457          * one for the current machine type
 458          */
 459         DBG("Probing machine type ...\n");
 460
 461         for (machine_id = &__machine_desc_start;
 462              machine_id < &__machine_desc_end;
 463              machine_id++) {
 464                 DBG("  %s ...", machine_id->name);
 465                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 466                 if (ppc_md.probe()) {
 467                         DBG(" match !\n");
 468                         break;
 469                 }
 470                 DBG("\n");
 471         }
 472         /* What can we do if we didn't find ? */
 473         if (machine_id >= &__machine_desc_end) {
 474                 DBG("No suitable machine found !\n");
 475                 for (;;);
 476         }
 477
 478         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 479 }
 480
 481 /* Match a class of boards, not a specific device configuration. */
 482 int check_legacy_ioport(unsigned long base_port)
 483 {
 484         struct device_node *parent, *np = NULL;
 485         int ret = -ENODEV;
 486
 487         switch(base_port) {
 488         case I8042_DATA_REG:
 489                 np = of_find_node_by_type(NULL, "8042");
 490                 break;
 491         case FDC_BASE: /* FDC1 */
 492                 np = of_find_node_by_type(NULL, "fdc");
 493                 break;
 494 #ifdef CONFIG_PPC_PREP
 495         case _PIDXR:
 496         case _PNPWRP:
 497         case PNPBIOS_BASE:
 498                 /* implement me */
 499 #endif
 500         default:
 501                 /* ipmi is supposed to fail here */
 502                 break;
 503         }
 504         if (!np)
 505                 return ret;
 506         parent = of_get_parent(np);
 507         if (parent) {
 508                 if (strcmp(parent->type, "isa") == 0)
 509                         ret = 0;
 510                 of_node_put(parent);
 511         }
 512         of_node_put(np);
 513         return ret;
 514 }
 515 EXPORT_SYMBOL(check_legacy_ioport);
 516
 517 static int ppc_panic_event(struct notifier_block *this,
 518                              unsigned long event, void *ptr)
 519 {
 520         ppc_md.panic(ptr);  /* May not return */
 521         return NOTIFY_DONE;
 522 }
 523
 524 static struct notifier_block ppc_panic_block = {
 525         .notifier_call = ppc_panic_event,
 526         .priority = INT_MIN /* may not return; must be done last */
 527 };
 528
 529 void __init setup_panic(void)
 530 {
 531         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 532 }
 533
 534 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 535 /*
 536  * For platforms that have configurable cache-coherency.  This function
 537  * checks that the cache coherency setting of the kernel matches the setting
 538  * left by the firmware, as indicated in the device tree.  Since a mismatch
 539  * will eventually result in DMA failures, we print * and error and call
 540  * BUG() in that case.
 541  */
 542
 543 #ifdef CONFIG_NOT_COHERENT_CACHE
 544 #define KERNEL_COHERENCY        0
 545 #else
 546 #define KERNEL_COHERENCY        1
 547 #endif
 548
 549 static int __init check_cache_coherency(void)
 550 {
 551         struct device_node *np;
 552         const void *prop;
 553         int devtree_coherency;
 554
 555         np = of_find_node_by_path("/");
 556         prop = of_get_property(np, "coherency-off", NULL);
 557         of_node_put(np);
 558
 559         devtree_coherency = prop ? 0 : 1;
 560
 561         if (devtree_coherency != KERNEL_COHERENCY) {
 562                 printk(KERN_ERR
 563                         "kernel coherency:%s != device tree_coherency:%s\n",
 564                         KERNEL_COHERENCY ? "on" : "off",
 565                         devtree_coherency ? "on" : "off");
 566                 BUG();
 567         }
 568
 569         return 0;
 570 }
 571
 572 late_initcall(check_cache_coherency);
 573 #endif /* CONFIG_CHECK_CACHE_COHERENCY */