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   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                 /*
 368                  * We have to set bits in cpu_possible_map here since the
 369                  * secondary CPU(s) aren't in the device tree, and
 370                  * setup_per_cpu_areas only allocates per-cpu data for
 371                  * CPUs in the cpu_possible_map.
 372                  */
 373                 int cpu;
 374
 375                 for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
 376                         cpu_set(cpu, cpu_possible_map);
 377                 smp_ops = &psurge_smp_ops;
 378         }
 379 #endif
 380 #endif /* CONFIG_SMP */
 381
 382 #ifdef CONFIG_ADB
 383         if (strstr(cmd_line, "adb_sync")) {
 384                 extern int __adb_probe_sync;
 385                 __adb_probe_sync = 1;
 386         }
 387 #endif /* CONFIG_ADB */
 388 }
 389
 390 char *bootpath;
 391 char *bootdevice;
 392 void *boot_host;
 393 int boot_target;
 394 int boot_part;
 395 static dev_t boot_dev;
 396
 397 #ifdef CONFIG_SCSI
 398 void note_scsi_host(struct device_node *node, void *host)
 399 {
 400         int l;
 401         char *p;
 402
 403         l = strlen(node->full_name);
 404         if (bootpath != NULL && bootdevice != NULL
 405             && strncmp(node->full_name, bootdevice, l) == 0
 406             && (bootdevice[l] == '/' || bootdevice[l] == 0)) {
 407                 boot_host = host;
 408                 /*
 409                  * There's a bug in OF 1.0.5.  (Why am I not surprised.)
 410                  * If you pass a path like scsi/sd@1:0 to canon, it returns
 411                  * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
 412                  * That is, the scsi target number doesn't get preserved.
 413                  * So we pick the target number out of bootpath and use that.
 414                  */
 415                 p = strstr(bootpath, "/sd@");
 416                 if (p != NULL) {
 417                         p += 4;
 418                         boot_target = simple_strtoul(p, NULL, 10);
 419                         p = strchr(p, ':');
 420                         if (p != NULL)
 421                                 boot_part = simple_strtoul(p + 1, NULL, 10);
 422                 }
 423         }
 424 }
 425 EXPORT_SYMBOL(note_scsi_host);
 426 #endif
 427
 428 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 429 static dev_t __init find_ide_boot(void)
 430 {
 431         char *p;
 432         int n;
 433         dev_t __init pmac_find_ide_boot(char *bootdevice, int n);
 434
 435         if (bootdevice == NULL)
 436                 return 0;
 437         p = strrchr(bootdevice, '/');
 438         if (p == NULL)
 439                 return 0;
 440         n = p - bootdevice;
 441
 442         return pmac_find_ide_boot(bootdevice, n);
 443 }
 444 #endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */
 445
 446 static void __init find_boot_device(void)
 447 {
 448 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 449         boot_dev = find_ide_boot();
 450 #endif
 451 }
 452
 453 static int initializing = 1;
 454
 455 static int pmac_late_init(void)
 456 {
 457         if (!machine_is(powermac))
 458                 return -ENODEV;
 459
 460         initializing = 0;
 461         /* this is udbg (which is __init) and we can later use it during
 462          * cpu hotplug (in smp_core99_kick_cpu) */
 463         ppc_md.progress = NULL;
 464         return 0;
 465 }
 466
 467 late_initcall(pmac_late_init);
 468
 469 /* can't be __init - can be called whenever a disk is first accessed */
 470 void note_bootable_part(dev_t dev, int part, int goodness)
 471 {
 472         static int found_boot = 0;
 473         char *p;
 474
 475         if (!initializing)
 476                 return;
 477         if ((goodness <= current_root_goodness) &&
 478             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 479                 return;
 480         p = strstr(boot_command_line, "root=");
 481         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 482                 return;
 483
 484         if (!found_boot) {
 485                 find_boot_device();
 486                 found_boot = 1;
 487         }
 488         if (!boot_dev || dev == boot_dev) {
 489                 ROOT_DEV = dev + part;
 490                 boot_dev = 0;
 491                 current_root_goodness = goodness;
 492         }
 493 }
 494
 495 #ifdef CONFIG_ADB_CUDA
 496 static void cuda_restart(void)
 497 {
 498         struct adb_request req;
 499
 500         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 501         for (;;)
 502                 cuda_poll();
 503 }
 504
 505 static void cuda_shutdown(void)
 506 {
 507         struct adb_request req;
 508
 509         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 510         for (;;)
 511                 cuda_poll();
 512 }
 513
 514 #else
 515 #define cuda_restart()
 516 #define cuda_shutdown()
 517 #endif
 518
 519 #ifndef CONFIG_ADB_PMU
 520 #define pmu_restart()
 521 #define pmu_shutdown()
 522 #endif
 523
 524 #ifndef CONFIG_PMAC_SMU
 525 #define smu_restart()
 526 #define smu_shutdown()
 527 #endif
 528
 529 static void pmac_restart(char *cmd)
 530 {
 531         switch (sys_ctrler) {
 532         case SYS_CTRLER_CUDA:
 533                 cuda_restart();
 534                 break;
 535         case SYS_CTRLER_PMU:
 536                 pmu_restart();
 537                 break;
 538         case SYS_CTRLER_SMU:
 539                 smu_restart();
 540                 break;
 541         default: ;
 542         }
 543 }
 544
 545 static void pmac_power_off(void)
 546 {
 547         switch (sys_ctrler) {
 548         case SYS_CTRLER_CUDA:
 549                 cuda_shutdown();
 550                 break;
 551         case SYS_CTRLER_PMU:
 552                 pmu_shutdown();
 553                 break;
 554         case SYS_CTRLER_SMU:
 555                 smu_shutdown();
 556                 break;
 557         default: ;
 558         }
 559 }
 560
 561 static void
 562 pmac_halt(void)
 563 {
 564         pmac_power_off();
 565 }
 566
 567 /*
 568  * Early initialization.
 569  */
 570 static void __init pmac_init_early(void)
 571 {
 572         /* Enable early btext debug if requested */
 573         if (strstr(cmd_line, "btextdbg")) {
 574                 udbg_adb_init_early();
 575                 register_early_udbg_console();
 576         }
 577
 578         /* Probe motherboard chipset */
 579         pmac_feature_init();
 580
 581         /* Initialize debug stuff */
 582         udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
 583         udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
 584
 585 #ifdef CONFIG_PPC64
 586         iommu_init_early_dart();
 587 #endif
 588 }
 589
 590 static int __init pmac_declare_of_platform_devices(void)
 591 {
 592         struct device_node *np;
 593
 594         if (machine_is(chrp))
 595                 return -1;
 596
 597         if (!machine_is(powermac))
 598                 return 0;
 599
 600         np = of_find_node_by_name(NULL, "valkyrie");
 601         if (np)
 602                 of_platform_device_create(np, "valkyrie", NULL);
 603         np = of_find_node_by_name(NULL, "platinum");
 604         if (np)
 605                 of_platform_device_create(np, "platinum", NULL);
 606         np = of_find_node_by_type(NULL, "smu");
 607         if (np) {
 608                 of_platform_device_create(np, "smu", NULL);
 609                 of_node_put(np);
 610         }
 611
 612         return 0;
 613 }
 614
 615 device_initcall(pmac_declare_of_platform_devices);
 616
 617 /*
 618  * Called very early, MMU is off, device-tree isn't unflattened
 619  */
 620 static int __init pmac_probe(void)
 621 {
 622         unsigned long root = of_get_flat_dt_root();
 623
 624         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 625             !of_flat_dt_is_compatible(root, "MacRISC"))
 626                 return 0;
 627
 628 #ifdef CONFIG_PPC64
 629         /*
 630          * On U3, the DART (iommu) must be allocated now since it
 631          * has an impact on htab_initialize (due to the large page it
 632          * occupies having to be broken up so the DART itself is not
 633          * part of the cacheable linar mapping
 634          */
 635         alloc_dart_table();
 636
 637         hpte_init_native();
 638 #endif
 639
 640 #ifdef CONFIG_PPC32
 641         /* isa_io_base gets set in pmac_pci_init */
 642         ISA_DMA_THRESHOLD = ~0L;
 643         DMA_MODE_READ = 1;
 644         DMA_MODE_WRITE = 2;
 645
 646 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 647 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 648         ppc_ide_md.ide_init_hwif        = pmac_ide_init_hwif_ports;
 649         ppc_ide_md.default_io_base      = pmac_ide_get_base;
 650 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 651 #endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */
 652
 653 #endif /* CONFIG_PPC32 */
 654
 655 #ifdef CONFIG_PMAC_SMU
 656         /*
 657          * SMU based G5s need some memory below 2Gb, at least the current
 658          * driver needs that. We have to allocate it now. We allocate 4k
 659          * (1 small page) for now.
 660          */
 661         smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
 662 #endif /* CONFIG_PMAC_SMU */
 663
 664         return 1;
 665 }
 666
 667 #ifdef CONFIG_PPC64
 668 /* Move that to pci.c */
 669 static int pmac_pci_probe_mode(struct pci_bus *bus)
 670 {
 671         struct device_node *node = bus->sysdata;
 672
 673         /* We need to use normal PCI probing for the AGP bus,
 674          * since the device for the AGP bridge isn't in the tree.
 675          */
 676         if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
 677                                   of_device_is_compatible(node, "u4-pcie")))
 678                 return PCI_PROBE_NORMAL;
 679         return PCI_PROBE_DEVTREE;
 680 }
 681
 682 #ifdef CONFIG_HOTPLUG_CPU
 683 /* access per cpu vars from generic smp.c */
 684 DECLARE_PER_CPU(int, cpu_state);
 685
 686 static void pmac_cpu_die(void)
 687 {
 688         /*
 689          * turn off as much as possible, we'll be
 690          * kicked out as this will only be invoked
 691          * on core99 platforms for now ...
 692          */
 693
 694         printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
 695         __get_cpu_var(cpu_state) = CPU_DEAD;
 696         smp_wmb();
 697
 698         /*
 699          * during the path that leads here preemption is disabled,
 700          * reenable it now so that when coming up preempt count is
 701          * zero correctly
 702          */
 703         preempt_enable();
 704
 705         /*
 706          * hard-disable interrupts for the non-NAP case, the NAP code
 707          * needs to re-enable interrupts (but soft-disables them)
 708          */
 709         hard_irq_disable();
 710
 711         while (1) {
 712                 /* let's not take timer interrupts too often ... */
 713                 set_dec(0x7fffffff);
 714
 715                 /* should always be true at this point */
 716                 if (cpu_has_feature(CPU_FTR_CAN_NAP))
 717                         power4_cpu_offline_powersave();
 718                 else {
 719                         HMT_low();
 720                         HMT_very_low();
 721                 }
 722         }
 723 }
 724 #endif /* CONFIG_HOTPLUG_CPU */
 725
 726 #endif /* CONFIG_PPC64 */
 727
 728 define_machine(powermac) {
 729         .name                   = "PowerMac",
 730         .probe                  = pmac_probe,
 731         .setup_arch             = pmac_setup_arch,
 732         .init_early             = pmac_init_early,
 733         .show_cpuinfo           = pmac_show_cpuinfo,
 734         .init_IRQ               = pmac_pic_init,
 735         .get_irq                = NULL, /* changed later */
 736         .pci_irq_fixup          = pmac_pci_irq_fixup,
 737         .restart                = pmac_restart,
 738         .power_off              = pmac_power_off,
 739         .halt                   = pmac_halt,
 740         .time_init              = pmac_time_init,
 741         .get_boot_time          = pmac_get_boot_time,
 742         .set_rtc_time           = pmac_set_rtc_time,
 743         .get_rtc_time           = pmac_get_rtc_time,
 744         .calibrate_decr         = pmac_calibrate_decr,
 745         .feature_call           = pmac_do_feature_call,
 746         .progress               = udbg_progress,
 747 #ifdef CONFIG_PPC64
 748         .pci_probe_mode         = pmac_pci_probe_mode,
 749         .power_save             = power4_idle,
 750         .enable_pmcs            = power4_enable_pmcs,
 751 #ifdef CONFIG_KEXEC
 752         .machine_kexec          = default_machine_kexec,
 753         .machine_kexec_prepare  = default_machine_kexec_prepare,
 754         .machine_crash_shutdown = default_machine_crash_shutdown,
 755 #endif
 756 #endif /* CONFIG_PPC64 */
 757 #ifdef CONFIG_PPC32
 758         .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
 759         .pcibios_after_init     = pmac_pcibios_after_init,
 760         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 761 #endif
 762 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
 763         .cpu_die                = pmac_cpu_die,
 764 #endif
 765 };