arch/powerpc/platforms/powermac/setup.c

   1 /*
   2  *  Powermac setup and early boot code plus other random bits.
   3  *
   4  *  PowerPC version
   5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   6  *
   7  *  Adapted for Power Macintosh by Paul Mackerras
   8  *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
   9  *
  10  *  Derived from "arch/alpha/kernel/setup.c"
  11  *    Copyright (C) 1995 Linus Torvalds
  12  *
  13  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
  14  *
  15  *  This program is free software; you can redistribute it and/or
  16  *  modify it under the terms of the GNU General Public License
  17  *  as published by the Free Software Foundation; either version
  18  *  2 of the License, or (at your option) any later version.
  19  *
  20  */
  21
  22 /*
  23  * bootup setup stuff..
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/errno.h>
  28 #include <linux/sched.h>
  29 #include <linux/kernel.h>
  30 #include <linux/mm.h>
  31 #include <linux/stddef.h>
  32 #include <linux/unistd.h>
  33 #include <linux/ptrace.h>
  34 #include <linux/slab.h>
  35 #include <linux/user.h>
  36 #include <linux/a.out.h>
  37 #include <linux/tty.h>
  38 #include <linux/string.h>
  39 #include <linux/delay.h>
  40 #include <linux/ioport.h>
  41 #include <linux/major.h>
  42 #include <linux/initrd.h>
  43 #include <linux/vt_kern.h>
  44 #include <linux/console.h>
  45 #include <linux/pci.h>
  46 #include <linux/adb.h>
  47 #include <linux/cuda.h>
  48 #include <linux/pmu.h>
  49 #include <linux/irq.h>
  50 #include <linux/seq_file.h>
  51 #include <linux/root_dev.h>
  52 #include <linux/bitops.h>
  53 #include <linux/suspend.h>
  54
  55 #include <asm/reg.h>
  56 #include <asm/sections.h>
  57 #include <asm/prom.h>
  58 #include <asm/system.h>
  59 #include <asm/pgtable.h>
  60 #include <asm/io.h>
  61 #include <asm/kexec.h>
  62 #include <asm/pci-bridge.h>
  63 #include <asm/ohare.h>
  64 #include <asm/mediabay.h>
  65 #include <asm/machdep.h>
  66 #include <asm/dma.h>
  67 #include <asm/cputable.h>
  68 #include <asm/btext.h>
  69 #include <asm/pmac_feature.h>
  70 #include <asm/time.h>
  71 #include <asm/of_device.h>
  72 #include <asm/of_platform.h>
  73 #include <asm/mmu_context.h>
  74 #include <asm/iommu.h>
  75 #include <asm/smu.h>
  76 #include <asm/pmc.h>
  77 #include <asm/lmb.h>
  78 #include <asm/udbg.h>
  79
  80 #include "pmac.h"
  81
  82 #undef SHOW_GATWICK_IRQS
  83
  84 int ppc_override_l2cr = 0;
  85 int ppc_override_l2cr_value;
  86 int has_l2cache = 0;
  87
  88 int pmac_newworld;
  89
  90 static int current_root_goodness = -1;
  91
  92 extern struct machdep_calls pmac_md;
  93
  94 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  95
  96 #ifdef CONFIG_PPC64
  97 #include <asm/udbg.h>
  98 int sccdbg;
  99 #endif
 100
 101 extern void zs_kgdb_hook(int tty_num);
 102
 103 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
 104 EXPORT_SYMBOL(sys_ctrler);
 105
 106 #ifdef CONFIG_PMAC_SMU
 107 unsigned long smu_cmdbuf_abs;
 108 EXPORT_SYMBOL(smu_cmdbuf_abs);
 109 #endif
 110
 111 #ifdef CONFIG_SMP
 112 extern struct smp_ops_t psurge_smp_ops;
 113 extern struct smp_ops_t core99_smp_ops;
 114 #endif /* CONFIG_SMP */
 115
 116 static void pmac_show_cpuinfo(struct seq_file *m)
 117 {
 118         struct device_node *np;
 119         const char *pp;
 120         int plen;
 121         int mbmodel;
 122         unsigned int mbflags;
 123         char* mbname;
 124
 125         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 126                                     PMAC_MB_INFO_MODEL, 0);
 127         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 128                                     PMAC_MB_INFO_FLAGS, 0);
 129         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 130                               (long) &mbname) != 0)
 131                 mbname = "Unknown";
 132
 133         /* find motherboard type */
 134         seq_printf(m, "machine\t\t: ");
 135         np = of_find_node_by_path("/");
 136         if (np != NULL) {
 137                 pp = of_get_property(np, "model", NULL);
 138                 if (pp != NULL)
 139                         seq_printf(m, "%s\n", pp);
 140                 else
 141                         seq_printf(m, "PowerMac\n");
 142                 pp = of_get_property(np, "compatible", &plen);
 143                 if (pp != NULL) {
 144                         seq_printf(m, "motherboard\t:");
 145                         while (plen > 0) {
 146                                 int l = strlen(pp) + 1;
 147                                 seq_printf(m, " %s", pp);
 148                                 plen -= l;
 149                                 pp += l;
 150                         }
 151                         seq_printf(m, "\n");
 152                 }
 153                 of_node_put(np);
 154         } else
 155                 seq_printf(m, "PowerMac\n");
 156
 157         /* print parsed model */
 158         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 159         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 160
 161         /* find l2 cache info */
 162         np = of_find_node_by_name(NULL, "l2-cache");
 163         if (np == NULL)
 164                 np = of_find_node_by_type(NULL, "cache");
 165         if (np != NULL) {
 166                 const unsigned int *ic =
 167                         of_get_property(np, "i-cache-size", NULL);
 168                 const unsigned int *dc =
 169                         of_get_property(np, "d-cache-size", NULL);
 170                 seq_printf(m, "L2 cache\t:");
 171                 has_l2cache = 1;
 172                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
 173                         seq_printf(m, " %dK unified", *dc / 1024);
 174                 } else {
 175                         if (ic)
 176                                 seq_printf(m, " %dK instruction", *ic / 1024);
 177                         if (dc)
 178                                 seq_printf(m, "%s %dK data",
 179                                            (ic? " +": ""), *dc / 1024);
 180                 }
 181                 pp = of_get_property(np, "ram-type", NULL);
 182                 if (pp)
 183                         seq_printf(m, " %s", pp);
 184                 seq_printf(m, "\n");
 185                 of_node_put(np);
 186         }
 187
 188         /* Indicate newworld/oldworld */
 189         seq_printf(m, "pmac-generation\t: %s\n",
 190                    pmac_newworld ? "NewWorld" : "OldWorld");
 191 }
 192
 193 #ifndef CONFIG_ADB_CUDA
 194 int find_via_cuda(void)
 195 {
 196         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 197
 198         if (!dn)
 199                 return 0;
 200         of_node_put(dn);
 201         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 202         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 203         return 0;
 204 }
 205 #endif
 206
 207 #ifndef CONFIG_ADB_PMU
 208 int find_via_pmu(void)
 209 {
 210         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 211
 212         if (!dn)
 213                 return 0;
 214         of_node_put(dn);
 215         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 216         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 217         return 0;
 218 }
 219 #endif
 220
 221 #ifndef CONFIG_PMAC_SMU
 222 int smu_init(void)
 223 {
 224         /* should check and warn if SMU is present */
 225         return 0;
 226 }
 227 #endif
 228
 229 #ifdef CONFIG_PPC32
 230 static volatile u32 *sysctrl_regs;
 231
 232 static void __init ohare_init(void)
 233 {
 234         struct device_node *dn;
 235
 236         /* this area has the CPU identification register
 237            and some registers used by smp boards */
 238         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 239
 240         /*
 241          * Turn on the L2 cache.
 242          * We assume that we have a PSX memory controller iff
 243          * we have an ohare I/O controller.
 244          */
 245         dn = of_find_node_by_name(NULL, "ohare");
 246         if (dn) {
 247                 of_node_put(dn);
 248                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 249                         if (sysctrl_regs[4] & 0x10)
 250                                 sysctrl_regs[4] |= 0x04000020;
 251                         else
 252                                 sysctrl_regs[4] |= 0x04000000;
 253                         if(has_l2cache)
 254                                 printk(KERN_INFO "Level 2 cache enabled\n");
 255                 }
 256         }
 257 }
 258
 259 static void __init l2cr_init(void)
 260 {
 261         /* Checks "l2cr-value" property in the registry */
 262         if (cpu_has_feature(CPU_FTR_L2CR)) {
 263                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
 264                 if (np == 0)
 265                         np = of_find_node_by_type(NULL, "cpu");
 266                 if (np != 0) {
 267                         const unsigned int *l2cr =
 268                                 of_get_property(np, "l2cr-value", NULL);
 269                         if (l2cr != 0) {
 270                                 ppc_override_l2cr = 1;
 271                                 ppc_override_l2cr_value = *l2cr;
 272                                 _set_L2CR(0);
 273                                 _set_L2CR(ppc_override_l2cr_value);
 274                         }
 275                         of_node_put(np);
 276                 }
 277         }
 278
 279         if (ppc_override_l2cr)
 280                 printk(KERN_INFO "L2CR overridden (0x%x), "
 281                        "backside cache is %s\n",
 282                        ppc_override_l2cr_value,
 283                        (ppc_override_l2cr_value & 0x80000000)
 284                                 ? "enabled" : "disabled");
 285 }
 286 #endif
 287
 288 static void __init pmac_setup_arch(void)
 289 {
 290         struct device_node *cpu, *ic;
 291         const int *fp;
 292         unsigned long pvr;
 293
 294         pvr = PVR_VER(mfspr(SPRN_PVR));
 295
 296         /* Set loops_per_jiffy to a half-way reasonable value,
 297            for use until calibrate_delay gets called. */
 298         loops_per_jiffy = 50000000 / HZ;
 299         cpu = of_find_node_by_type(NULL, "cpu");
 300         if (cpu != NULL) {
 301                 fp = of_get_property(cpu, "clock-frequency", NULL);
 302                 if (fp != NULL) {
 303                         if (pvr >= 0x30 && pvr < 0x80)
 304                                 /* PPC970 etc. */
 305                                 loops_per_jiffy = *fp / (3 * HZ);
 306                         else if (pvr == 4 || pvr >= 8)
 307                                 /* 604, G3, G4 etc. */
 308                                 loops_per_jiffy = *fp / HZ;
 309                         else
 310                                 /* 601, 603, etc. */
 311                                 loops_per_jiffy = *fp / (2 * HZ);
 312                 }
 313                 of_node_put(cpu);
 314         }
 315
 316         /* See if newworld or oldworld */
 317         for (ic = NULL; (ic = of_find_all_nodes(ic)) != NULL; )
 318                 if (of_get_property(ic, "interrupt-controller", NULL))
 319                         break;
 320         if (ic) {
 321                 pmac_newworld = 1;
 322                 of_node_put(ic);
 323         }
 324
 325         /* Lookup PCI hosts */
 326         pmac_pci_init();
 327
 328 #ifdef CONFIG_PPC32
 329         ohare_init();
 330         l2cr_init();
 331 #endif /* CONFIG_PPC32 */
 332
 333 #ifdef CONFIG_KGDB
 334         zs_kgdb_hook(0);
 335 #endif
 336
 337         find_via_cuda();
 338         find_via_pmu();
 339         smu_init();
 340
 341 #if defined(CONFIG_NVRAM) || defined(CONFIG_PPC64)
 342         pmac_nvram_init();
 343 #endif
 344
 345 #ifdef CONFIG_PPC32
 346 #ifdef CONFIG_BLK_DEV_INITRD
 347         if (initrd_start)
 348                 ROOT_DEV = Root_RAM0;
 349         else
 350 #endif
 351                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 352 #endif
 353
 354 #ifdef CONFIG_SMP
 355         /* Check for Core99 */
 356         ic = of_find_node_by_name(NULL, "uni-n");
 357         if (!ic)
 358                 ic = of_find_node_by_name(NULL, "u3");
 359         if (!ic)
 360                 ic = of_find_node_by_name(NULL, "u4");
 361         if (ic) {
 362                 of_node_put(ic);
 363                 smp_ops = &core99_smp_ops;
 364         }
 365 #ifdef CONFIG_PPC32
 366         else
 367                 smp_ops = &psurge_smp_ops;
 368 #endif
 369 #endif /* CONFIG_SMP */
 370
 371 #ifdef CONFIG_ADB
 372         if (strstr(cmd_line, "adb_sync")) {
 373                 extern int __adb_probe_sync;
 374                 __adb_probe_sync = 1;
 375         }
 376 #endif /* CONFIG_ADB */
 377 }
 378
 379 char *bootpath;
 380 char *bootdevice;
 381 void *boot_host;
 382 int boot_target;
 383 int boot_part;
 384 static dev_t boot_dev;
 385
 386 #ifdef CONFIG_SCSI
 387 void __init note_scsi_host(struct device_node *node, void *host)
 388 {
 389         int l;
 390         char *p;
 391
 392         l = strlen(node->full_name);
 393         if (bootpath != NULL && bootdevice != NULL
 394             && strncmp(node->full_name, bootdevice, l) == 0
 395             && (bootdevice[l] == '/' || bootdevice[l] == 0)) {
 396                 boot_host = host;
 397                 /*
 398                  * There's a bug in OF 1.0.5.  (Why am I not surprised.)
 399                  * If you pass a path like scsi/sd@1:0 to canon, it returns
 400                  * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
 401                  * That is, the scsi target number doesn't get preserved.
 402                  * So we pick the target number out of bootpath and use that.
 403                  */
 404                 p = strstr(bootpath, "/sd@");
 405                 if (p != NULL) {
 406                         p += 4;
 407                         boot_target = simple_strtoul(p, NULL, 10);
 408                         p = strchr(p, ':');
 409                         if (p != NULL)
 410                                 boot_part = simple_strtoul(p + 1, NULL, 10);
 411                 }
 412         }
 413 }
 414 EXPORT_SYMBOL(note_scsi_host);
 415 #endif
 416
 417 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 418 static dev_t __init find_ide_boot(void)
 419 {
 420         char *p;
 421         int n;
 422         dev_t __init pmac_find_ide_boot(char *bootdevice, int n);
 423
 424         if (bootdevice == NULL)
 425                 return 0;
 426         p = strrchr(bootdevice, '/');
 427         if (p == NULL)
 428                 return 0;
 429         n = p - bootdevice;
 430
 431         return pmac_find_ide_boot(bootdevice, n);
 432 }
 433 #endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */
 434
 435 static void __init find_boot_device(void)
 436 {
 437 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 438         boot_dev = find_ide_boot();
 439 #endif
 440 }
 441
 442 static int initializing = 1;
 443
 444 static int pmac_late_init(void)
 445 {
 446         initializing = 0;
 447         /* this is udbg (which is __init) and we can later use it during
 448          * cpu hotplug (in smp_core99_kick_cpu) */
 449         ppc_md.progress = NULL;
 450         return 0;
 451 }
 452
 453 late_initcall(pmac_late_init);
 454
 455 /* can't be __init - can be called whenever a disk is first accessed */
 456 void note_bootable_part(dev_t dev, int part, int goodness)
 457 {
 458         static int found_boot = 0;
 459         char *p;
 460
 461         if (!initializing)
 462                 return;
 463         if ((goodness <= current_root_goodness) &&
 464             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 465                 return;
 466         p = strstr(boot_command_line, "root=");
 467         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 468                 return;
 469
 470         if (!found_boot) {
 471                 find_boot_device();
 472                 found_boot = 1;
 473         }
 474         if (!boot_dev || dev == boot_dev) {
 475                 ROOT_DEV = dev + part;
 476                 boot_dev = 0;
 477                 current_root_goodness = goodness;
 478         }
 479 }
 480
 481 #ifdef CONFIG_ADB_CUDA
 482 static void cuda_restart(void)
 483 {
 484         struct adb_request req;
 485
 486         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 487         for (;;)
 488                 cuda_poll();
 489 }
 490
 491 static void cuda_shutdown(void)
 492 {
 493         struct adb_request req;
 494
 495         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 496         for (;;)
 497                 cuda_poll();
 498 }
 499
 500 #else
 501 #define cuda_restart()
 502 #define cuda_shutdown()
 503 #endif
 504
 505 #ifndef CONFIG_ADB_PMU
 506 #define pmu_restart()
 507 #define pmu_shutdown()
 508 #endif
 509
 510 #ifndef CONFIG_PMAC_SMU
 511 #define smu_restart()
 512 #define smu_shutdown()
 513 #endif
 514
 515 static void pmac_restart(char *cmd)
 516 {
 517         switch (sys_ctrler) {
 518         case SYS_CTRLER_CUDA:
 519                 cuda_restart();
 520                 break;
 521         case SYS_CTRLER_PMU:
 522                 pmu_restart();
 523                 break;
 524         case SYS_CTRLER_SMU:
 525                 smu_restart();
 526                 break;
 527         default: ;
 528         }
 529 }
 530
 531 static void pmac_power_off(void)
 532 {
 533         switch (sys_ctrler) {
 534         case SYS_CTRLER_CUDA:
 535                 cuda_shutdown();
 536                 break;
 537         case SYS_CTRLER_PMU:
 538                 pmu_shutdown();
 539                 break;
 540         case SYS_CTRLER_SMU:
 541                 smu_shutdown();
 542                 break;
 543         default: ;
 544         }
 545 }
 546
 547 static void
 548 pmac_halt(void)
 549 {
 550         pmac_power_off();
 551 }
 552
 553 /*
 554  * Early initialization.
 555  */
 556 static void __init pmac_init_early(void)
 557 {
 558         /* Enable early btext debug if requested */
 559         if (strstr(cmd_line, "btextdbg")) {
 560                 udbg_adb_init_early();
 561                 register_early_udbg_console();
 562         }
 563
 564         /* Probe motherboard chipset */
 565         pmac_feature_init();
 566
 567         /* Initialize debug stuff */
 568         udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
 569         udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
 570
 571 #ifdef CONFIG_PPC64
 572         iommu_init_early_dart();
 573 #endif
 574 }
 575
 576 static int __init pmac_declare_of_platform_devices(void)
 577 {
 578         struct device_node *np;
 579
 580         if (machine_is(chrp))
 581                 return -1;
 582
 583         if (!machine_is(powermac))
 584                 return 0;
 585
 586         np = of_find_node_by_name(NULL, "valkyrie");
 587         if (np)
 588                 of_platform_device_create(np, "valkyrie", NULL);
 589         np = of_find_node_by_name(NULL, "platinum");
 590         if (np)
 591                 of_platform_device_create(np, "platinum", NULL);
 592         np = of_find_node_by_type(NULL, "smu");
 593         if (np) {
 594                 of_platform_device_create(np, "smu", NULL);
 595                 of_node_put(np);
 596         }
 597
 598         return 0;
 599 }
 600
 601 device_initcall(pmac_declare_of_platform_devices);
 602
 603 /*
 604  * Called very early, MMU is off, device-tree isn't unflattened
 605  */
 606 static int __init pmac_probe(void)
 607 {
 608         unsigned long root = of_get_flat_dt_root();
 609
 610         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 611             !of_flat_dt_is_compatible(root, "MacRISC"))
 612                 return 0;
 613
 614 #ifdef CONFIG_PPC64
 615         /*
 616          * On U3, the DART (iommu) must be allocated now since it
 617          * has an impact on htab_initialize (due to the large page it
 618          * occupies having to be broken up so the DART itself is not
 619          * part of the cacheable linar mapping
 620          */
 621         alloc_dart_table();
 622
 623         hpte_init_native();
 624 #endif
 625
 626 #ifdef CONFIG_PPC32
 627         /* isa_io_base gets set in pmac_pci_init */
 628         ISA_DMA_THRESHOLD = ~0L;
 629         DMA_MODE_READ = 1;
 630         DMA_MODE_WRITE = 2;
 631
 632 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 633 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 634         ppc_ide_md.ide_init_hwif        = pmac_ide_init_hwif_ports;
 635         ppc_ide_md.default_io_base      = pmac_ide_get_base;
 636 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 637 #endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */
 638
 639 #endif /* CONFIG_PPC32 */
 640
 641 #ifdef CONFIG_PMAC_SMU
 642         /*
 643          * SMU based G5s need some memory below 2Gb, at least the current
 644          * driver needs that. We have to allocate it now. We allocate 4k
 645          * (1 small page) for now.
 646          */
 647         smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
 648 #endif /* CONFIG_PMAC_SMU */
 649
 650         return 1;
 651 }
 652
 653 #ifdef CONFIG_PPC64
 654 /* Move that to pci.c */
 655 static int pmac_pci_probe_mode(struct pci_bus *bus)
 656 {
 657         struct device_node *node = bus->sysdata;
 658
 659         /* We need to use normal PCI probing for the AGP bus,
 660          * since the device for the AGP bridge isn't in the tree.
 661          */
 662         if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
 663                                   of_device_is_compatible(node, "u4-pcie")))
 664                 return PCI_PROBE_NORMAL;
 665         return PCI_PROBE_DEVTREE;
 666 }
 667
 668 #ifdef CONFIG_HOTPLUG_CPU
 669 /* access per cpu vars from generic smp.c */
 670 DECLARE_PER_CPU(int, cpu_state);
 671
 672 static void pmac_cpu_die(void)
 673 {
 674         /*
 675          * turn off as much as possible, we'll be
 676          * kicked out as this will only be invoked
 677          * on core99 platforms for now ...
 678          */
 679
 680         printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
 681         __get_cpu_var(cpu_state) = CPU_DEAD;
 682         smp_wmb();
 683
 684         /*
 685          * during the path that leads here preemption is disabled,
 686          * reenable it now so that when coming up preempt count is
 687          * zero correctly
 688          */
 689         preempt_enable();
 690
 691         /*
 692          * hard-disable interrupts for the non-NAP case, the NAP code
 693          * needs to re-enable interrupts (but soft-disables them)
 694          */
 695         hard_irq_disable();
 696
 697         while (1) {
 698                 /* let's not take timer interrupts too often ... */
 699                 set_dec(0x7fffffff);
 700
 701                 /* should always be true at this point */
 702                 if (cpu_has_feature(CPU_FTR_CAN_NAP))
 703                         power4_cpu_offline_powersave();
 704                 else {
 705                         HMT_low();
 706                         HMT_very_low();
 707                 }
 708         }
 709 }
 710 #endif /* CONFIG_HOTPLUG_CPU */
 711
 712 #endif /* CONFIG_PPC64 */
 713
 714 define_machine(powermac) {
 715         .name                   = "PowerMac",
 716         .probe                  = pmac_probe,
 717         .setup_arch             = pmac_setup_arch,
 718         .init_early             = pmac_init_early,
 719         .show_cpuinfo           = pmac_show_cpuinfo,
 720         .init_IRQ               = pmac_pic_init,
 721         .get_irq                = NULL, /* changed later */
 722         .pci_irq_fixup          = pmac_pci_irq_fixup,
 723         .restart                = pmac_restart,
 724         .power_off              = pmac_power_off,
 725         .halt                   = pmac_halt,
 726         .time_init              = pmac_time_init,
 727         .get_boot_time          = pmac_get_boot_time,
 728         .set_rtc_time           = pmac_set_rtc_time,
 729         .get_rtc_time           = pmac_get_rtc_time,
 730         .calibrate_decr         = pmac_calibrate_decr,
 731         .feature_call           = pmac_do_feature_call,
 732         .progress               = udbg_progress,
 733 #ifdef CONFIG_PPC64
 734         .pci_probe_mode         = pmac_pci_probe_mode,
 735         .power_save             = power4_idle,
 736         .enable_pmcs            = power4_enable_pmcs,
 737 #ifdef CONFIG_KEXEC
 738         .machine_kexec          = default_machine_kexec,
 739         .machine_kexec_prepare  = default_machine_kexec_prepare,
 740         .machine_crash_shutdown = default_machine_crash_shutdown,
 741 #endif
 742 #endif /* CONFIG_PPC64 */
 743 #ifdef CONFIG_PPC32
 744         .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
 745         .pcibios_after_init     = pmac_pcibios_after_init,
 746         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 747 #endif
 748 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
 749         .cpu_die                = pmac_cpu_die,
 750 #endif
 751 };