arch/powerpc/platforms/pseries/setup.c

   1 /*
   2  *  64-bit pSeries and RS/6000 setup code.
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Adapted from 'alpha' version by Gary Thomas
   6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   7  *  Modified by PPC64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  * bootup setup stuff..
  17  */
  18
  19 #include <linux/cpu.h>
  20 #include <linux/errno.h>
  21 #include <linux/sched.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/stddef.h>
  25 #include <linux/unistd.h>
  26 #include <linux/user.h>
  27 #include <linux/tty.h>
  28 #include <linux/major.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/reboot.h>
  31 #include <linux/init.h>
  32 #include <linux/ioport.h>
  33 #include <linux/console.h>
  34 #include <linux/pci.h>
  35 #include <linux/utsname.h>
  36 #include <linux/adb.h>
  37 #include <linux/export.h>
  38 #include <linux/delay.h>
  39 #include <linux/irq.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/root_dev.h>
  42 #include <linux/cpuidle.h>
  43 #include <linux/of.h>
  44 #include <linux/kexec.h>
  45
  46 #include <asm/mmu.h>
  47 #include <asm/processor.h>
  48 #include <asm/io.h>
  49 #include <asm/pgtable.h>
  50 #include <asm/prom.h>
  51 #include <asm/rtas.h>
  52 #include <asm/pci-bridge.h>
  53 #include <asm/iommu.h>
  54 #include <asm/dma.h>
  55 #include <asm/machdep.h>
  56 #include <asm/irq.h>
  57 #include <asm/time.h>
  58 #include <asm/nvram.h>
  59 #include <asm/pmc.h>
  60 #include <asm/mpic.h>
  61 #include <asm/xics.h>
  62 #include <asm/ppc-pci.h>
  63 #include <asm/i8259.h>
  64 #include <asm/udbg.h>
  65 #include <asm/smp.h>
  66 #include <asm/firmware.h>
  67 #include <asm/eeh.h>
  68
  69 #include "plpar_wrappers.h"
  70 #include "pseries.h"
  71
  72 int CMO_PrPSP = -1;
  73 int CMO_SecPSP = -1;
  74 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
  75 EXPORT_SYMBOL(CMO_PageSize);
  76
  77 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  78
  79 static struct device_node *pSeries_mpic_node;
  80
  81 static void pSeries_show_cpuinfo(struct seq_file *m)
  82 {
  83         struct device_node *root;
  84         const char *model = "";
  85
  86         root = of_find_node_by_path("/");
  87         if (root)
  88                 model = of_get_property(root, "model", NULL);
  89         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  90         of_node_put(root);
  91 }
  92
  93 /* Initialize firmware assisted non-maskable interrupts if
  94  * the firmware supports this feature.
  95  */
  96 static void __init fwnmi_init(void)
  97 {
  98         unsigned long system_reset_addr, machine_check_addr;
  99
 100         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 101         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 102                 return;
 103
 104         /* If the kernel's not linked at zero we point the firmware at low
 105          * addresses anyway, and use a trampoline to get to the real code. */
 106         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 107         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 108
 109         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 110                                 machine_check_addr))
 111                 fwnmi_active = 1;
 112 }
 113
 114 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 115 {
 116         struct irq_chip *chip = irq_desc_get_chip(desc);
 117         unsigned int cascade_irq = i8259_irq();
 118
 119         if (cascade_irq != NO_IRQ)
 120                 generic_handle_irq(cascade_irq);
 121
 122         chip->irq_eoi(&desc->irq_data);
 123 }
 124
 125 static void __init pseries_setup_i8259_cascade(void)
 126 {
 127         struct device_node *np, *old, *found = NULL;
 128         unsigned int cascade;
 129         const u32 *addrp;
 130         unsigned long intack = 0;
 131         int naddr;
 132
 133         for_each_node_by_type(np, "interrupt-controller") {
 134                 if (of_device_is_compatible(np, "chrp,iic")) {
 135                         found = np;
 136                         break;
 137                 }
 138         }
 139
 140         if (found == NULL) {
 141                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 142                 return;
 143         }
 144
 145         cascade = irq_of_parse_and_map(found, 0);
 146         if (cascade == NO_IRQ) {
 147                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 148                 return;
 149         }
 150         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 151
 152         for (old = of_node_get(found); old != NULL ; old = np) {
 153                 np = of_get_parent(old);
 154                 of_node_put(old);
 155                 if (np == NULL)
 156                         break;
 157                 if (strcmp(np->name, "pci") != 0)
 158                         continue;
 159                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 160                 if (addrp == NULL)
 161                         continue;
 162                 naddr = of_n_addr_cells(np);
 163                 intack = addrp[naddr-1];
 164                 if (naddr > 1)
 165                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 166         }
 167         if (intack)
 168                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 169         i8259_init(found, intack);
 170         of_node_put(found);
 171         irq_set_chained_handler(cascade, pseries_8259_cascade);
 172 }
 173
 174 static void __init pseries_mpic_init_IRQ(void)
 175 {
 176         struct device_node *np;
 177         const unsigned int *opprop;
 178         unsigned long openpic_addr = 0;
 179         int naddr, n, i, opplen;
 180         struct mpic *mpic;
 181
 182         np = of_find_node_by_path("/");
 183         naddr = of_n_addr_cells(np);
 184         opprop = of_get_property(np, "platform-open-pic", &opplen);
 185         if (opprop != 0) {
 186                 openpic_addr = of_read_number(opprop, naddr);
 187                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 188         }
 189         of_node_put(np);
 190
 191         BUG_ON(openpic_addr == 0);
 192
 193         /* Setup the openpic driver */
 194         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 195                         MPIC_NO_RESET, 16, 0, " MPIC     ");
 196         BUG_ON(mpic == NULL);
 197
 198         /* Add ISUs */
 199         opplen /= sizeof(u32);
 200         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 201                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 202                 mpic_assign_isu(mpic, n, isuaddr);
 203         }
 204
 205         /* Setup top-level get_irq */
 206         ppc_md.get_irq = mpic_get_irq;
 207
 208         /* All ISUs are setup, complete initialization */
 209         mpic_init(mpic);
 210
 211         /* Look for cascade */
 212         pseries_setup_i8259_cascade();
 213 }
 214
 215 static void __init pseries_xics_init_IRQ(void)
 216 {
 217         xics_init();
 218         pseries_setup_i8259_cascade();
 219 }
 220
 221 static void pseries_lpar_enable_pmcs(void)
 222 {
 223         unsigned long set, reset;
 224
 225         set = 1UL << 63;
 226         reset = 0;
 227         plpar_hcall_norets(H_PERFMON, set, reset);
 228 }
 229
 230 static void __init pseries_discover_pic(void)
 231 {
 232         struct device_node *np;
 233         const char *typep;
 234
 235         for (np = NULL; (np = of_find_node_by_name(np,
 236                                                    "interrupt-controller"));) {
 237                 typep = of_get_property(np, "compatible", NULL);
 238                 if (strstr(typep, "open-pic")) {
 239                         pSeries_mpic_node = of_node_get(np);
 240                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 241                         setup_kexec_cpu_down_mpic();
 242                         smp_init_pseries_mpic();
 243                         return;
 244                 } else if (strstr(typep, "ppc-xicp")) {
 245                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 246                         setup_kexec_cpu_down_xics();
 247                         smp_init_pseries_xics();
 248                         return;
 249                 }
 250         }
 251         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 252                " interrupt-controller\n");
 253 }
 254
 255 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
 256 {
 257         struct device_node *np = node;
 258         struct pci_dn *pci = NULL;
 259         int err = NOTIFY_OK;
 260
 261         switch (action) {
 262         case OF_RECONFIG_ATTACH_NODE:
 263                 pci = np->parent->data;
 264                 if (pci) {
 265                         update_dn_pci_info(np, pci->phb);
 266
 267                         /* Create EEH device for the OF node */
 268                         eeh_dev_init(np, pci->phb);
 269                 }
 270                 break;
 271         default:
 272                 err = NOTIFY_DONE;
 273                 break;
 274         }
 275         return err;
 276 }
 277
 278 static struct notifier_block pci_dn_reconfig_nb = {
 279         .notifier_call = pci_dn_reconfig_notifier,
 280 };
 281
 282 struct kmem_cache *dtl_cache;
 283
 284 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 285 /*
 286  * Allocate space for the dispatch trace log for all possible cpus
 287  * and register the buffers with the hypervisor.  This is used for
 288  * computing time stolen by the hypervisor.
 289  */
 290 static int alloc_dispatch_logs(void)
 291 {
 292         int cpu, ret;
 293         struct paca_struct *pp;
 294         struct dtl_entry *dtl;
 295
 296         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 297                 return 0;
 298
 299         if (!dtl_cache)
 300                 return 0;
 301
 302         for_each_possible_cpu(cpu) {
 303                 pp = &paca[cpu];
 304                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
 305                 if (!dtl) {
 306                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
 307                                 cpu);
 308                         pr_warn("Stolen time statistics will be unreliable\n");
 309                         break;
 310                 }
 311
 312                 pp->dtl_ridx = 0;
 313                 pp->dispatch_log = dtl;
 314                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
 315                 pp->dtl_curr = dtl;
 316         }
 317
 318         /* Register the DTL for the current (boot) cpu */
 319         dtl = get_paca()->dispatch_log;
 320         get_paca()->dtl_ridx = 0;
 321         get_paca()->dtl_curr = dtl;
 322         get_paca()->lppaca_ptr->dtl_idx = 0;
 323
 324         /* hypervisor reads buffer length from this field */
 325         dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
 326         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 327         if (ret)
 328                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
 329                        "with %d\n", smp_processor_id(),
 330                        hard_smp_processor_id(), ret);
 331         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
 332
 333         return 0;
 334 }
 335 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 336 static inline int alloc_dispatch_logs(void)
 337 {
 338         return 0;
 339 }
 340 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 341
 342 static int alloc_dispatch_log_kmem_cache(void)
 343 {
 344         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 345                                                 DISPATCH_LOG_BYTES, 0, NULL);
 346         if (!dtl_cache) {
 347                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 348                 pr_warn("Stolen time statistics will be unreliable\n");
 349                 return 0;
 350         }
 351
 352         return alloc_dispatch_logs();
 353 }
 354 early_initcall(alloc_dispatch_log_kmem_cache);
 355
 356 static void pSeries_idle(void)
 357 {
 358         /* This would call on the cpuidle framework, and the back-end pseries
 359          * driver to  go to idle states
 360          */
 361         if (cpuidle_idle_call()) {
 362                 /* On error, execute default handler
 363                  * to go into low thread priority and possibly
 364                  * low power mode.
 365                  */
 366                 HMT_low();
 367                 HMT_very_low();
 368         }
 369 }
 370
 371 /*
 372  * Enable relocation on during exceptions. This has partition wide scope and
 373  * may take a while to complete, if it takes longer than one second we will
 374  * just give up rather than wasting any more time on this - if that turns out
 375  * to ever be a problem in practice we can move this into a kernel thread to
 376  * finish off the process later in boot.
 377  */
 378 static int __init pSeries_enable_reloc_on_exc(void)
 379 {
 380         long rc;
 381         unsigned int delay, total_delay = 0;
 382
 383         while (1) {
 384                 rc = enable_reloc_on_exceptions();
 385                 if (!H_IS_LONG_BUSY(rc))
 386                         return rc;
 387
 388                 delay = get_longbusy_msecs(rc);
 389                 total_delay += delay;
 390                 if (total_delay > 1000) {
 391                         pr_warn("Warning: Giving up waiting to enable "
 392                                 "relocation on exceptions (%u msec)!\n",
 393                                 total_delay);
 394                         return rc;
 395                 }
 396
 397                 mdelay(delay);
 398         }
 399 }
 400
 401 #ifdef CONFIG_KEXEC
 402 static long pSeries_disable_reloc_on_exc(void)
 403 {
 404         long rc;
 405
 406         while (1) {
 407                 rc = disable_reloc_on_exceptions();
 408                 if (!H_IS_LONG_BUSY(rc))
 409                         return rc;
 410                 mdelay(get_longbusy_msecs(rc));
 411         }
 412 }
 413
 414 static void pSeries_machine_kexec(struct kimage *image)
 415 {
 416         long rc;
 417
 418         if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
 419             (image->type != KEXEC_TYPE_CRASH)) {
 420                 rc = pSeries_disable_reloc_on_exc();
 421                 if (rc != H_SUCCESS)
 422                         pr_warning("Warning: Failed to disable relocation on "
 423                                    "exceptions: %ld\n", rc);
 424         }
 425
 426         default_machine_kexec(image);
 427 }
 428 #endif
 429
 430 static void __init pSeries_setup_arch(void)
 431 {
 432         panic_timeout = 10;
 433
 434         /* Discover PIC type and setup ppc_md accordingly */
 435         pseries_discover_pic();
 436
 437         /* openpic global configuration register (64-bit format). */
 438         /* openpic Interrupt Source Unit pointer (64-bit format). */
 439         /* python0 facility area (mmio) (64-bit format) REAL address. */
 440
 441         /* init to some ~sane value until calibrate_delay() runs */
 442         loops_per_jiffy = 50000000;
 443
 444         fwnmi_init();
 445
 446         /* By default, only probe PCI (can be overriden by rtas_pci) */
 447         pci_add_flags(PCI_PROBE_ONLY);
 448
 449         /* Find and initialize PCI host bridges */
 450         init_pci_config_tokens();
 451         find_and_init_phbs();
 452         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 453
 454         pSeries_nvram_init();
 455
 456         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 457                 vpa_init(boot_cpuid);
 458                 ppc_md.power_save = pSeries_idle;
 459         }
 460
 461         if (firmware_has_feature(FW_FEATURE_LPAR))
 462                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 463         else
 464                 ppc_md.enable_pmcs = power4_enable_pmcs;
 465
 466         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 467                 long rc;
 468                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
 469                         pr_warn("Unable to enable relocation on exceptions: "
 470                                 "%ld\n", rc);
 471                 }
 472         }
 473 }
 474
 475 static int __init pSeries_init_panel(void)
 476 {
 477         /* Manually leave the kernel version on the panel. */
 478         ppc_md.progress("Linux ppc64\n", 0);
 479         ppc_md.progress(init_utsname()->version, 0);
 480
 481         return 0;
 482 }
 483 machine_arch_initcall(pseries, pSeries_init_panel);
 484
 485 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 486 {
 487         return plpar_hcall_norets(H_SET_DABR, dabr);
 488 }
 489
 490 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 491 {
 492         /* Have to set at least one bit in the DABRX according to PAPR */
 493         if (dabrx == 0 && dabr == 0)
 494                 dabrx = DABRX_USER;
 495         /* PAPR says we can only set kernel and user bits */
 496         dabrx &= DABRX_KERNEL | DABRX_USER;
 497
 498         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 499 }
 500
 501 #define CMO_CHARACTERISTICS_TOKEN 44
 502 #define CMO_MAXLENGTH 1026
 503
 504 void pSeries_coalesce_init(void)
 505 {
 506         struct hvcall_mpp_x_data mpp_x_data;
 507
 508         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 509                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 510         else
 511                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 512 }
 513
 514 /**
 515  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 516  * handle that here. (Stolen from parse_system_parameter_string)
 517  */
 518 void pSeries_cmo_feature_init(void)
 519 {
 520         char *ptr, *key, *value, *end;
 521         int call_status;
 522         int page_order = IOMMU_PAGE_SHIFT;
 523
 524         pr_debug(" -> fw_cmo_feature_init()\n");
 525         spin_lock(&rtas_data_buf_lock);
 526         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 527         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 528                                 NULL,
 529                                 CMO_CHARACTERISTICS_TOKEN,
 530                                 __pa(rtas_data_buf),
 531                                 RTAS_DATA_BUF_SIZE);
 532
 533         if (call_status != 0) {
 534                 spin_unlock(&rtas_data_buf_lock);
 535                 pr_debug("CMO not available\n");
 536                 pr_debug(" <- fw_cmo_feature_init()\n");
 537                 return;
 538         }
 539
 540         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 541         ptr = rtas_data_buf + 2;        /* step over strlen value */
 542         key = value = ptr;
 543
 544         while (*ptr && (ptr <= end)) {
 545                 /* Separate the key and value by replacing '=' with '\0' and
 546                  * point the value at the string after the '='
 547                  */
 548                 if (ptr[0] == '=') {
 549                         ptr[0] = '\0';
 550                         value = ptr + 1;
 551                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 552                         /* Terminate the string containing the key/value pair */
 553                         ptr[0] = '\0';
 554
 555                         if (key == value) {
 556                                 pr_debug("Malformed key/value pair\n");
 557                                 /* Never found a '=', end processing */
 558                                 break;
 559                         }
 560
 561                         if (0 == strcmp(key, "CMOPageSize"))
 562                                 page_order = simple_strtol(value, NULL, 10);
 563                         else if (0 == strcmp(key, "PrPSP"))
 564                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 565                         else if (0 == strcmp(key, "SecPSP"))
 566                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 567                         value = key = ptr + 1;
 568                 }
 569                 ptr++;
 570         }
 571
 572         /* Page size is returned as the power of 2 of the page size,
 573          * convert to the page size in bytes before returning
 574          */
 575         CMO_PageSize = 1 << page_order;
 576         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 577
 578         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 579                 pr_info("CMO enabled\n");
 580                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 581                          CMO_SecPSP);
 582                 powerpc_firmware_features |= FW_FEATURE_CMO;
 583                 pSeries_coalesce_init();
 584         } else
 585                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 586                          CMO_SecPSP);
 587         spin_unlock(&rtas_data_buf_lock);
 588         pr_debug(" <- fw_cmo_feature_init()\n");
 589 }
 590
 591 /*
 592  * Early initialization.  Relocation is on but do not reference unbolted pages
 593  */
 594 static void __init pSeries_init_early(void)
 595 {
 596         pr_debug(" -> pSeries_init_early()\n");
 597
 598 #ifdef CONFIG_HVC_CONSOLE
 599         if (firmware_has_feature(FW_FEATURE_LPAR))
 600                 hvc_vio_init_early();
 601 #endif
 602         if (firmware_has_feature(FW_FEATURE_XDABR))
 603                 ppc_md.set_dabr = pseries_set_xdabr;
 604         else if (firmware_has_feature(FW_FEATURE_DABR))
 605                 ppc_md.set_dabr = pseries_set_dabr;
 606
 607         pSeries_cmo_feature_init();
 608         iommu_init_early_pSeries();
 609
 610         pr_debug(" <- pSeries_init_early()\n");
 611 }
 612
 613 /*
 614  * Called very early, MMU is off, device-tree isn't unflattened
 615  */
 616
 617 static int __init pSeries_probe_hypertas(unsigned long node,
 618                                          const char *uname, int depth,
 619                                          void *data)
 620 {
 621         const char *hypertas;
 622         unsigned long len;
 623
 624         if (depth != 1 ||
 625             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 626                 return 0;
 627
 628         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 629         if (!hypertas)
 630                 return 1;
 631
 632         powerpc_firmware_features |= FW_FEATURE_LPAR;
 633         fw_feature_init(hypertas, len);
 634
 635         return 1;
 636 }
 637
 638 static int __init pSeries_probe(void)
 639 {
 640         unsigned long root = of_get_flat_dt_root();
 641         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 642
 643         if (dtype == NULL)
 644                 return 0;
 645         if (strcmp(dtype, "chrp"))
 646                 return 0;
 647
 648         /* Cell blades firmware claims to be chrp while it's not. Until this
 649          * is fixed, we need to avoid those here.
 650          */
 651         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 652             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 653                 return 0;
 654
 655         pr_debug("pSeries detected, looking for LPAR capability...\n");
 656
 657         /* Now try to figure out if we are running on LPAR */
 658         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 659
 660         if (firmware_has_feature(FW_FEATURE_LPAR))
 661                 hpte_init_lpar();
 662         else
 663                 hpte_init_native();
 664
 665         pr_debug("Machine is%s LPAR !\n",
 666                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 667
 668         return 1;
 669 }
 670
 671 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 672 {
 673         if (firmware_has_feature(FW_FEATURE_LPAR))
 674                 return PCI_PROBE_DEVTREE;
 675         return PCI_PROBE_NORMAL;
 676 }
 677
 678 /**
 679  * pSeries_power_off - tell firmware about how to power off the system.
 680  *
 681  * This function calls either the power-off rtas token in normal cases
 682  * or the ibm,power-off-ups token (if present & requested) in case of
 683  * a power failure. If power-off token is used, power on will only be
 684  * possible with power button press. If ibm,power-off-ups token is used
 685  * it will allow auto poweron after power is restored.
 686  */
 687 static void pSeries_power_off(void)
 688 {
 689         int rc;
 690         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 691
 692         if (rtas_flash_term_hook)
 693                 rtas_flash_term_hook(SYS_POWER_OFF);
 694
 695         if (rtas_poweron_auto == 0 ||
 696                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 697                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 698                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 699         } else {
 700                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 701                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 702         }
 703         for (;;);
 704 }
 705
 706 #ifndef CONFIG_PCI
 707 void pSeries_final_fixup(void) { }
 708 #endif
 709
 710 define_machine(pseries) {
 711         .name                   = "pSeries",
 712         .probe                  = pSeries_probe,
 713         .setup_arch             = pSeries_setup_arch,
 714         .init_early             = pSeries_init_early,
 715         .show_cpuinfo           = pSeries_show_cpuinfo,
 716         .log_error              = pSeries_log_error,
 717         .pcibios_fixup          = pSeries_final_fixup,
 718         .pci_probe_mode         = pSeries_pci_probe_mode,
 719         .restart                = rtas_restart,
 720         .power_off              = pSeries_power_off,
 721         .halt                   = rtas_halt,
 722         .panic                  = rtas_os_term,
 723         .get_boot_time          = rtas_get_boot_time,
 724         .get_rtc_time           = rtas_get_rtc_time,
 725         .set_rtc_time           = rtas_set_rtc_time,
 726         .calibrate_decr         = generic_calibrate_decr,
 727         .progress               = rtas_progress,
 728         .system_reset_exception = pSeries_system_reset_exception,
 729         .machine_check_exception = pSeries_machine_check_exception,
 730 #ifdef CONFIG_KEXEC
 731         .machine_kexec          = pSeries_machine_kexec,
 732 #endif
 733 };