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/tty.h>
  37 #include <linux/string.h>
  38 #include <linux/delay.h>
  39 #include <linux/ioport.h>
  40 #include <linux/major.h>
  41 #include <linux/initrd.h>
  42 #include <linux/vt_kern.h>
  43 #include <linux/console.h>
  44 #include <linux/pci.h>
  45 #include <linux/adb.h>
  46 #include <linux/cuda.h>
  47 #include <linux/pmu.h>
  48 #include <linux/irq.h>
  49 #include <linux/seq_file.h>
  50 #include <linux/root_dev.h>
  51 #include <linux/bitops.h>
  52 #include <linux/suspend.h>
  53 #include <linux/of_device.h>
  54 #include <linux/of_platform.h>
  55 #include <linux/lmb.h>
  56
  57 #include <asm/reg.h>
  58 #include <asm/sections.h>
  59 #include <asm/prom.h>
  60 #include <asm/system.h>
  61 #include <asm/pgtable.h>
  62 #include <asm/io.h>
  63 #include <asm/pci-bridge.h>
  64 #include <asm/ohare.h>
  65 #include <asm/mediabay.h>
  66 #include <asm/machdep.h>
  67 #include <asm/dma.h>
  68 #include <asm/cputable.h>
  69 #include <asm/btext.h>
  70 #include <asm/pmac_feature.h>
  71 #include <asm/time.h>
  72 #include <asm/mmu_context.h>
  73 #include <asm/iommu.h>
  74 #include <asm/smu.h>
  75 #include <asm/pmc.h>
  76 #include <asm/udbg.h>
  77
  78 #include "pmac.h"
  79
  80 #undef SHOW_GATWICK_IRQS
  81
  82 int ppc_override_l2cr = 0;
  83 int ppc_override_l2cr_value;
  84 int has_l2cache = 0;
  85
  86 int pmac_newworld;
  87
  88 static int current_root_goodness = -1;
  89
  90 extern struct machdep_calls pmac_md;
  91
  92 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  93
  94 #ifdef CONFIG_PPC64
  95 int sccdbg;
  96 #endif
  97
  98 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  99 EXPORT_SYMBOL(sys_ctrler);
 100
 101 #ifdef CONFIG_PMAC_SMU
 102 unsigned long smu_cmdbuf_abs;
 103 EXPORT_SYMBOL(smu_cmdbuf_abs);
 104 #endif
 105
 106 #ifdef CONFIG_SMP
 107 extern struct smp_ops_t psurge_smp_ops;
 108 extern struct smp_ops_t core99_smp_ops;
 109 #endif /* CONFIG_SMP */
 110
 111 static void pmac_show_cpuinfo(struct seq_file *m)
 112 {
 113         struct device_node *np;
 114         const char *pp;
 115         int plen;
 116         int mbmodel;
 117         unsigned int mbflags;
 118         char* mbname;
 119
 120         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 121                                     PMAC_MB_INFO_MODEL, 0);
 122         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 123                                     PMAC_MB_INFO_FLAGS, 0);
 124         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 125                               (long) &mbname) != 0)
 126                 mbname = "Unknown";
 127
 128         /* find motherboard type */
 129         seq_printf(m, "machine\t\t: ");
 130         np = of_find_node_by_path("/");
 131         if (np != NULL) {
 132                 pp = of_get_property(np, "model", NULL);
 133                 if (pp != NULL)
 134                         seq_printf(m, "%s\n", pp);
 135                 else
 136                         seq_printf(m, "PowerMac\n");
 137                 pp = of_get_property(np, "compatible", &plen);
 138                 if (pp != NULL) {
 139                         seq_printf(m, "motherboard\t:");
 140                         while (plen > 0) {
 141                                 int l = strlen(pp) + 1;
 142                                 seq_printf(m, " %s", pp);
 143                                 plen -= l;
 144                                 pp += l;
 145                         }
 146                         seq_printf(m, "\n");
 147                 }
 148                 of_node_put(np);
 149         } else
 150                 seq_printf(m, "PowerMac\n");
 151
 152         /* print parsed model */
 153         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 154         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 155
 156         /* find l2 cache info */
 157         np = of_find_node_by_name(NULL, "l2-cache");
 158         if (np == NULL)
 159                 np = of_find_node_by_type(NULL, "cache");
 160         if (np != NULL) {
 161                 const unsigned int *ic =
 162                         of_get_property(np, "i-cache-size", NULL);
 163                 const unsigned int *dc =
 164                         of_get_property(np, "d-cache-size", NULL);
 165                 seq_printf(m, "L2 cache\t:");
 166                 has_l2cache = 1;
 167                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
 168                         seq_printf(m, " %dK unified", *dc / 1024);
 169                 } else {
 170                         if (ic)
 171                                 seq_printf(m, " %dK instruction", *ic / 1024);
 172                         if (dc)
 173                                 seq_printf(m, "%s %dK data",
 174                                            (ic? " +": ""), *dc / 1024);
 175                 }
 176                 pp = of_get_property(np, "ram-type", NULL);
 177                 if (pp)
 178                         seq_printf(m, " %s", pp);
 179                 seq_printf(m, "\n");
 180                 of_node_put(np);
 181         }
 182
 183         /* Indicate newworld/oldworld */
 184         seq_printf(m, "pmac-generation\t: %s\n",
 185                    pmac_newworld ? "NewWorld" : "OldWorld");
 186 }
 187
 188 #ifndef CONFIG_ADB_CUDA
 189 int find_via_cuda(void)
 190 {
 191         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 192
 193         if (!dn)
 194                 return 0;
 195         of_node_put(dn);
 196         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 197         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 198         return 0;
 199 }
 200 #endif
 201
 202 #ifndef CONFIG_ADB_PMU
 203 int find_via_pmu(void)
 204 {
 205         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 206
 207         if (!dn)
 208                 return 0;
 209         of_node_put(dn);
 210         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 211         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 212         return 0;
 213 }
 214 #endif
 215
 216 #ifndef CONFIG_PMAC_SMU
 217 int smu_init(void)
 218 {
 219         /* should check and warn if SMU is present */
 220         return 0;
 221 }
 222 #endif
 223
 224 #ifdef CONFIG_PPC32
 225 static volatile u32 *sysctrl_regs;
 226
 227 static void __init ohare_init(void)
 228 {
 229         struct device_node *dn;
 230
 231         /* this area has the CPU identification register
 232            and some registers used by smp boards */
 233         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 234
 235         /*
 236          * Turn on the L2 cache.
 237          * We assume that we have a PSX memory controller iff
 238          * we have an ohare I/O controller.
 239          */
 240         dn = of_find_node_by_name(NULL, "ohare");
 241         if (dn) {
 242                 of_node_put(dn);
 243                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 244                         if (sysctrl_regs[4] & 0x10)
 245                                 sysctrl_regs[4] |= 0x04000020;
 246                         else
 247                                 sysctrl_regs[4] |= 0x04000000;
 248                         if(has_l2cache)
 249                                 printk(KERN_INFO "Level 2 cache enabled\n");
 250                 }
 251         }
 252 }
 253
 254 static void __init l2cr_init(void)
 255 {
 256         /* Checks "l2cr-value" property in the registry */
 257         if (cpu_has_feature(CPU_FTR_L2CR)) {
 258                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
 259                 if (np == 0)
 260                         np = of_find_node_by_type(NULL, "cpu");
 261                 if (np != 0) {
 262                         const unsigned int *l2cr =
 263                                 of_get_property(np, "l2cr-value", NULL);
 264                         if (l2cr != 0) {
 265                                 ppc_override_l2cr = 1;
 266                                 ppc_override_l2cr_value = *l2cr;
 267                                 _set_L2CR(0);
 268                                 _set_L2CR(ppc_override_l2cr_value);
 269                         }
 270                         of_node_put(np);
 271                 }
 272         }
 273
 274         if (ppc_override_l2cr)
 275                 printk(KERN_INFO "L2CR overridden (0x%x), "
 276                        "backside cache is %s\n",
 277                        ppc_override_l2cr_value,
 278                        (ppc_override_l2cr_value & 0x80000000)
 279                                 ? "enabled" : "disabled");
 280 }
 281 #endif
 282
 283 static void __init pmac_setup_arch(void)
 284 {
 285         struct device_node *cpu, *ic;
 286         const int *fp;
 287         unsigned long pvr;
 288
 289         pvr = PVR_VER(mfspr(SPRN_PVR));
 290
 291         /* Set loops_per_jiffy to a half-way reasonable value,
 292            for use until calibrate_delay gets called. */
 293         loops_per_jiffy = 50000000 / HZ;
 294         cpu = of_find_node_by_type(NULL, "cpu");
 295         if (cpu != NULL) {
 296                 fp = of_get_property(cpu, "clock-frequency", NULL);
 297                 if (fp != NULL) {
 298                         if (pvr >= 0x30 && pvr < 0x80)
 299                                 /* PPC970 etc. */
 300                                 loops_per_jiffy = *fp / (3 * HZ);
 301                         else if (pvr == 4 || pvr >= 8)
 302                                 /* 604, G3, G4 etc. */
 303                                 loops_per_jiffy = *fp / HZ;
 304                         else
 305                                 /* 601, 603, etc. */
 306                                 loops_per_jiffy = *fp / (2 * HZ);
 307                 }
 308                 of_node_put(cpu);
 309         }
 310
 311         /* See if newworld or oldworld */
 312         ic = of_find_node_with_property(NULL, "interrupt-controller");
 313         if (ic) {
 314                 pmac_newworld = 1;
 315                 of_node_put(ic);
 316         }
 317
 318         /* Lookup PCI hosts */
 319         pmac_pci_init();
 320
 321 #ifdef CONFIG_PPC32
 322         ohare_init();
 323         l2cr_init();
 324 #endif /* CONFIG_PPC32 */
 325
 326         find_via_cuda();
 327         find_via_pmu();
 328         smu_init();
 329
 330 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
 331     defined(CONFIG_PPC64)
 332         pmac_nvram_init();
 333 #endif
 334
 335 #ifdef CONFIG_PPC32
 336 #ifdef CONFIG_BLK_DEV_INITRD
 337         if (initrd_start)
 338                 ROOT_DEV = Root_RAM0;
 339         else
 340 #endif
 341                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 342 #endif
 343
 344 #ifdef CONFIG_SMP
 345         /* Check for Core99 */
 346         ic = of_find_node_by_name(NULL, "uni-n");
 347         if (!ic)
 348                 ic = of_find_node_by_name(NULL, "u3");
 349         if (!ic)
 350                 ic = of_find_node_by_name(NULL, "u4");
 351         if (ic) {
 352                 of_node_put(ic);
 353                 smp_ops = &core99_smp_ops;
 354         }
 355 #ifdef CONFIG_PPC32
 356         else {
 357                 /*
 358                  * We have to set bits in cpu_possible_map here since the
 359                  * secondary CPU(s) aren't in the device tree, and
 360                  * setup_per_cpu_areas only allocates per-cpu data for
 361                  * CPUs in the cpu_possible_map.
 362                  */
 363                 int cpu;
 364
 365                 for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
 366                         cpu_set(cpu, cpu_possible_map);
 367                 smp_ops = &psurge_smp_ops;
 368         }
 369 #endif
 370 #endif /* CONFIG_SMP */
 371
 372 #ifdef CONFIG_ADB
 373         if (strstr(cmd_line, "adb_sync")) {
 374                 extern int __adb_probe_sync;
 375                 __adb_probe_sync = 1;
 376         }
 377 #endif /* CONFIG_ADB */
 378 }
 379
 380 #ifdef CONFIG_SCSI
 381 void note_scsi_host(struct device_node *node, void *host)
 382 {
 383 }
 384 EXPORT_SYMBOL(note_scsi_host);
 385 #endif
 386
 387 static int initializing = 1;
 388
 389 static int pmac_late_init(void)
 390 {
 391         initializing = 0;
 392         /* this is udbg (which is __init) and we can later use it during
 393          * cpu hotplug (in smp_core99_kick_cpu) */
 394         ppc_md.progress = NULL;
 395         return 0;
 396 }
 397 machine_late_initcall(powermac, pmac_late_init);
 398
 399 /*
 400  * This is __init_refok because we check for "initializing" before
 401  * touching any of the __init sensitive things and "initializing"
 402  * will be false after __init time. This can't be __init because it
 403  * can be called whenever a disk is first accessed.
 404  */
 405 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
 406 {
 407         char *p;
 408
 409         if (!initializing)
 410                 return;
 411         if ((goodness <= current_root_goodness) &&
 412             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 413                 return;
 414         p = strstr(boot_command_line, "root=");
 415         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 416                 return;
 417
 418         ROOT_DEV = dev + part;
 419         current_root_goodness = goodness;
 420 }
 421
 422 #ifdef CONFIG_ADB_CUDA
 423 static void cuda_restart(void)
 424 {
 425         struct adb_request req;
 426
 427         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 428         for (;;)
 429                 cuda_poll();
 430 }
 431
 432 static void cuda_shutdown(void)
 433 {
 434         struct adb_request req;
 435
 436         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 437         for (;;)
 438                 cuda_poll();
 439 }
 440
 441 #else
 442 #define cuda_restart()
 443 #define cuda_shutdown()
 444 #endif
 445
 446 #ifndef CONFIG_ADB_PMU
 447 #define pmu_restart()
 448 #define pmu_shutdown()
 449 #endif
 450
 451 #ifndef CONFIG_PMAC_SMU
 452 #define smu_restart()
 453 #define smu_shutdown()
 454 #endif
 455
 456 static void pmac_restart(char *cmd)
 457 {
 458         switch (sys_ctrler) {
 459         case SYS_CTRLER_CUDA:
 460                 cuda_restart();
 461                 break;
 462         case SYS_CTRLER_PMU:
 463                 pmu_restart();
 464                 break;
 465         case SYS_CTRLER_SMU:
 466                 smu_restart();
 467                 break;
 468         default: ;
 469         }
 470 }
 471
 472 static void pmac_power_off(void)
 473 {
 474         switch (sys_ctrler) {
 475         case SYS_CTRLER_CUDA:
 476                 cuda_shutdown();
 477                 break;
 478         case SYS_CTRLER_PMU:
 479                 pmu_shutdown();
 480                 break;
 481         case SYS_CTRLER_SMU:
 482                 smu_shutdown();
 483                 break;
 484         default: ;
 485         }
 486 }
 487
 488 static void
 489 pmac_halt(void)
 490 {
 491         pmac_power_off();
 492 }
 493
 494 /*
 495  * Early initialization.
 496  */
 497 static void __init pmac_init_early(void)
 498 {
 499         /* Enable early btext debug if requested */
 500         if (strstr(cmd_line, "btextdbg")) {
 501                 udbg_adb_init_early();
 502                 register_early_udbg_console();
 503         }
 504
 505         /* Probe motherboard chipset */
 506         pmac_feature_init();
 507
 508         /* Initialize debug stuff */
 509         udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
 510         udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
 511
 512 #ifdef CONFIG_PPC64
 513         iommu_init_early_dart();
 514 #endif
 515 }
 516
 517 static int __init pmac_declare_of_platform_devices(void)
 518 {
 519         struct device_node *np;
 520
 521         if (machine_is(chrp))
 522                 return -1;
 523
 524         np = of_find_node_by_name(NULL, "valkyrie");
 525         if (np)
 526                 of_platform_device_create(np, "valkyrie", NULL);
 527         np = of_find_node_by_name(NULL, "platinum");
 528         if (np)
 529                 of_platform_device_create(np, "platinum", NULL);
 530         np = of_find_node_by_type(NULL, "smu");
 531         if (np) {
 532                 of_platform_device_create(np, "smu", NULL);
 533                 of_node_put(np);
 534         }
 535
 536         return 0;
 537 }
 538 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 539
 540 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 541 /*
 542  * This is called very early, as part of console_init() (typically just after
 543  * time_init()). This function is respondible for trying to find a good
 544  * default console on serial ports. It tries to match the open firmware
 545  * default output with one of the available serial console drivers.
 546  */
 547 static int __init check_pmac_serial_console(void)
 548 {
 549         struct device_node *prom_stdout = NULL;
 550         int offset = 0;
 551         const char *name;
 552 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 553         char *devname = "ttyS";
 554 #else
 555         char *devname = "ttyPZ";
 556 #endif
 557
 558         pr_debug(" -> check_pmac_serial_console()\n");
 559
 560         /* The user has requested a console so this is already set up. */
 561         if (strstr(boot_command_line, "console=")) {
 562                 pr_debug(" console was specified !\n");
 563                 return -EBUSY;
 564         }
 565
 566         if (!of_chosen) {
 567                 pr_debug(" of_chosen is NULL !\n");
 568                 return -ENODEV;
 569         }
 570
 571         /* We are getting a weird phandle from OF ... */
 572         /* ... So use the full path instead */
 573         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 574         if (name == NULL) {
 575                 pr_debug(" no linux,stdout-path !\n");
 576                 return -ENODEV;
 577         }
 578         prom_stdout = of_find_node_by_path(name);
 579         if (!prom_stdout) {
 580                 pr_debug(" can't find stdout package %s !\n", name);
 581                 return -ENODEV;
 582         }
 583         pr_debug("stdout is %s\n", prom_stdout->full_name);
 584
 585         name = of_get_property(prom_stdout, "name", NULL);
 586         if (!name) {
 587                 pr_debug(" stdout package has no name !\n");
 588                 goto not_found;
 589         }
 590
 591         if (strcmp(name, "ch-a") == 0)
 592                 offset = 0;
 593         else if (strcmp(name, "ch-b") == 0)
 594                 offset = 1;
 595         else
 596                 goto not_found;
 597         of_node_put(prom_stdout);
 598
 599         pr_debug("Found serial console at %s%d\n", devname, offset);
 600
 601         return add_preferred_console(devname, offset, NULL);
 602
 603  not_found:
 604         pr_debug("No preferred console found !\n");
 605         of_node_put(prom_stdout);
 606         return -ENODEV;
 607 }
 608 console_initcall(check_pmac_serial_console);
 609
 610 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 611
 612 /*
 613  * Called very early, MMU is off, device-tree isn't unflattened
 614  */
 615 static int __init pmac_probe(void)
 616 {
 617         unsigned long root = of_get_flat_dt_root();
 618
 619         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 620             !of_flat_dt_is_compatible(root, "MacRISC"))
 621                 return 0;
 622
 623 #ifdef CONFIG_PPC64
 624         /*
 625          * On U3, the DART (iommu) must be allocated now since it
 626          * has an impact on htab_initialize (due to the large page it
 627          * occupies having to be broken up so the DART itself is not
 628          * part of the cacheable linar mapping
 629          */
 630         alloc_dart_table();
 631
 632         hpte_init_native();
 633 #endif
 634
 635 #ifdef CONFIG_PPC32
 636         /* isa_io_base gets set in pmac_pci_init */
 637         ISA_DMA_THRESHOLD = ~0L;
 638         DMA_MODE_READ = 1;
 639         DMA_MODE_WRITE = 2;
 640 #endif /* CONFIG_PPC32 */
 641
 642 #ifdef CONFIG_PMAC_SMU
 643         /*
 644          * SMU based G5s need some memory below 2Gb, at least the current
 645          * driver needs that. We have to allocate it now. We allocate 4k
 646          * (1 small page) for now.
 647          */
 648         smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
 649 #endif /* CONFIG_PMAC_SMU */
 650
 651         return 1;
 652 }
 653
 654 #ifdef CONFIG_PPC64
 655 /* Move that to pci.c */
 656 static int pmac_pci_probe_mode(struct pci_bus *bus)
 657 {
 658         struct device_node *node = bus->sysdata;
 659
 660         /* We need to use normal PCI probing for the AGP bus,
 661          * since the device for the AGP bridge isn't in the tree.
 662          * Same for the PCIe host on U4 and the HT host bridge.
 663          */
 664         if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
 665                                   of_device_is_compatible(node, "u4-pcie") ||
 666                                   of_device_is_compatible(node, "u3-ht")))
 667                 return PCI_PROBE_NORMAL;
 668         return PCI_PROBE_DEVTREE;
 669 }
 670
 671 #ifdef CONFIG_HOTPLUG_CPU
 672 /* access per cpu vars from generic smp.c */
 673 DECLARE_PER_CPU(int, cpu_state);
 674
 675 static void pmac_cpu_die(void)
 676 {
 677         /*
 678          * turn off as much as possible, we'll be
 679          * kicked out as this will only be invoked
 680          * on core99 platforms for now ...
 681          */
 682
 683         printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
 684         __get_cpu_var(cpu_state) = CPU_DEAD;
 685         smp_wmb();
 686
 687         /*
 688          * during the path that leads here preemption is disabled,
 689          * reenable it now so that when coming up preempt count is
 690          * zero correctly
 691          */
 692         preempt_enable();
 693
 694         /*
 695          * hard-disable interrupts for the non-NAP case, the NAP code
 696          * needs to re-enable interrupts (but soft-disables them)
 697          */
 698         hard_irq_disable();
 699
 700         while (1) {
 701                 /* let's not take timer interrupts too often ... */
 702                 set_dec(0x7fffffff);
 703
 704                 /* should always be true at this point */
 705                 if (cpu_has_feature(CPU_FTR_CAN_NAP))
 706                         power4_cpu_offline_powersave();
 707                 else {
 708                         HMT_low();
 709                         HMT_very_low();
 710                 }
 711         }
 712 }
 713 #endif /* CONFIG_HOTPLUG_CPU */
 714
 715 #endif /* CONFIG_PPC64 */
 716
 717 define_machine(powermac) {
 718         .name                   = "PowerMac",
 719         .probe                  = pmac_probe,
 720         .setup_arch             = pmac_setup_arch,
 721         .init_early             = pmac_init_early,
 722         .show_cpuinfo           = pmac_show_cpuinfo,
 723         .init_IRQ               = pmac_pic_init,
 724         .get_irq                = NULL, /* changed later */
 725         .pci_irq_fixup          = pmac_pci_irq_fixup,
 726         .restart                = pmac_restart,
 727         .power_off              = pmac_power_off,
 728         .halt                   = pmac_halt,
 729         .time_init              = pmac_time_init,
 730         .get_boot_time          = pmac_get_boot_time,
 731         .set_rtc_time           = pmac_set_rtc_time,
 732         .get_rtc_time           = pmac_get_rtc_time,
 733         .calibrate_decr         = pmac_calibrate_decr,
 734         .feature_call           = pmac_do_feature_call,
 735         .progress               = udbg_progress,
 736 #ifdef CONFIG_PPC64
 737         .pci_probe_mode         = pmac_pci_probe_mode,
 738         .power_save             = power4_idle,
 739         .enable_pmcs            = power4_enable_pmcs,
 740 #endif /* CONFIG_PPC64 */
 741 #ifdef CONFIG_PPC32
 742         .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
 743         .pcibios_after_init     = pmac_pcibios_after_init,
 744         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 745 #endif
 746 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
 747         .cpu_die                = pmac_cpu_die,
 748 #endif
 749 };