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 #include <asm/reg.h>
  69 #include <asm/plpar_wrappers.h>
  70
  71 #include "pseries.h"
  72
  73 int CMO_PrPSP = -1;
  74 int CMO_SecPSP = -1;
  75 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
  76 EXPORT_SYMBOL(CMO_PageSize);
  77
  78 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  79
  80 static struct device_node *pSeries_mpic_node;
  81
  82 static void pSeries_show_cpuinfo(struct seq_file *m)
  83 {
  84         struct device_node *root;
  85         const char *model = "";
  86
  87         root = of_find_node_by_path("/");
  88         if (root)
  89                 model = of_get_property(root, "model", NULL);
  90         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  91         of_node_put(root);
  92 }
  93
  94 /* Initialize firmware assisted non-maskable interrupts if
  95  * the firmware supports this feature.
  96  */
  97 static void __init fwnmi_init(void)
  98 {
  99         unsigned long system_reset_addr, machine_check_addr;
 100
 101         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 102         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 103                 return;
 104
 105         /* If the kernel's not linked at zero we point the firmware at low
 106          * addresses anyway, and use a trampoline to get to the real code. */
 107         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 108         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 109
 110         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 111                                 machine_check_addr))
 112                 fwnmi_active = 1;
 113 }
 114
 115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 116 {
 117         struct irq_chip *chip = irq_desc_get_chip(desc);
 118         unsigned int cascade_irq = i8259_irq();
 119
 120         if (cascade_irq != NO_IRQ)
 121                 generic_handle_irq(cascade_irq);
 122
 123         chip->irq_eoi(&desc->irq_data);
 124 }
 125
 126 static void __init pseries_setup_i8259_cascade(void)
 127 {
 128         struct device_node *np, *old, *found = NULL;
 129         unsigned int cascade;
 130         const u32 *addrp;
 131         unsigned long intack = 0;
 132         int naddr;
 133
 134         for_each_node_by_type(np, "interrupt-controller") {
 135                 if (of_device_is_compatible(np, "chrp,iic")) {
 136                         found = np;
 137                         break;
 138                 }
 139         }
 140
 141         if (found == NULL) {
 142                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 143                 return;
 144         }
 145
 146         cascade = irq_of_parse_and_map(found, 0);
 147         if (cascade == NO_IRQ) {
 148                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 149                 return;
 150         }
 151         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 152
 153         for (old = of_node_get(found); old != NULL ; old = np) {
 154                 np = of_get_parent(old);
 155                 of_node_put(old);
 156                 if (np == NULL)
 157                         break;
 158                 if (strcmp(np->name, "pci") != 0)
 159                         continue;
 160                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 161                 if (addrp == NULL)
 162                         continue;
 163                 naddr = of_n_addr_cells(np);
 164                 intack = addrp[naddr-1];
 165                 if (naddr > 1)
 166                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 167         }
 168         if (intack)
 169                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 170         i8259_init(found, intack);
 171         of_node_put(found);
 172         irq_set_chained_handler(cascade, pseries_8259_cascade);
 173 }
 174
 175 static void __init pseries_mpic_init_IRQ(void)
 176 {
 177         struct device_node *np;
 178         const unsigned int *opprop;
 179         unsigned long openpic_addr = 0;
 180         int naddr, n, i, opplen;
 181         struct mpic *mpic;
 182
 183         np = of_find_node_by_path("/");
 184         naddr = of_n_addr_cells(np);
 185         opprop = of_get_property(np, "platform-open-pic", &opplen);
 186         if (opprop != NULL) {
 187                 openpic_addr = of_read_number(opprop, naddr);
 188                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 189         }
 190         of_node_put(np);
 191
 192         BUG_ON(openpic_addr == 0);
 193
 194         /* Setup the openpic driver */
 195         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 196                         MPIC_NO_RESET, 16, 0, " MPIC     ");
 197         BUG_ON(mpic == NULL);
 198
 199         /* Add ISUs */
 200         opplen /= sizeof(u32);
 201         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 202                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 203                 mpic_assign_isu(mpic, n, isuaddr);
 204         }
 205
 206         /* Setup top-level get_irq */
 207         ppc_md.get_irq = mpic_get_irq;
 208
 209         /* All ISUs are setup, complete initialization */
 210         mpic_init(mpic);
 211
 212         /* Look for cascade */
 213         pseries_setup_i8259_cascade();
 214 }
 215
 216 static void __init pseries_xics_init_IRQ(void)
 217 {
 218         xics_init();
 219         pseries_setup_i8259_cascade();
 220 }
 221
 222 static void pseries_lpar_enable_pmcs(void)
 223 {
 224         unsigned long set, reset;
 225
 226         set = 1UL << 63;
 227         reset = 0;
 228         plpar_hcall_norets(H_PERFMON, set, reset);
 229 }
 230
 231 static void __init pseries_discover_pic(void)
 232 {
 233         struct device_node *np;
 234         const char *typep;
 235
 236         for (np = NULL; (np = of_find_node_by_name(np,
 237                                                    "interrupt-controller"));) {
 238                 typep = of_get_property(np, "compatible", NULL);
 239                 if (strstr(typep, "open-pic")) {
 240                         pSeries_mpic_node = of_node_get(np);
 241                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 242                         setup_kexec_cpu_down_mpic();
 243                         smp_init_pseries_mpic();
 244                         return;
 245                 } else if (strstr(typep, "ppc-xicp")) {
 246                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 247                         setup_kexec_cpu_down_xics();
 248                         smp_init_pseries_xics();
 249                         return;
 250                 }
 251         }
 252         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 253                " interrupt-controller\n");
 254 }
 255
 256 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
 257 {
 258         struct device_node *np = node;
 259         struct pci_dn *pci = NULL;
 260         int err = NOTIFY_OK;
 261
 262         switch (action) {
 263         case OF_RECONFIG_ATTACH_NODE:
 264                 pci = np->parent->data;
 265                 if (pci) {
 266                         update_dn_pci_info(np, pci->phb);
 267
 268                         /* Create EEH device for the OF node */
 269                         eeh_dev_init(np, pci->phb);
 270                 }
 271                 break;
 272         default:
 273                 err = NOTIFY_DONE;
 274                 break;
 275         }
 276         return err;
 277 }
 278
 279 static struct notifier_block pci_dn_reconfig_nb = {
 280         .notifier_call = pci_dn_reconfig_notifier,
 281 };
 282
 283 struct kmem_cache *dtl_cache;
 284
 285 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 286 /*
 287  * Allocate space for the dispatch trace log for all possible cpus
 288  * and register the buffers with the hypervisor.  This is used for
 289  * computing time stolen by the hypervisor.
 290  */
 291 static int alloc_dispatch_logs(void)
 292 {
 293         int cpu, ret;
 294         struct paca_struct *pp;
 295         struct dtl_entry *dtl;
 296
 297         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 298                 return 0;
 299
 300         if (!dtl_cache)
 301                 return 0;
 302
 303         for_each_possible_cpu(cpu) {
 304                 pp = &paca[cpu];
 305                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
 306                 if (!dtl) {
 307                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
 308                                 cpu);
 309                         pr_warn("Stolen time statistics will be unreliable\n");
 310                         break;
 311                 }
 312
 313                 pp->dtl_ridx = 0;
 314                 pp->dispatch_log = dtl;
 315                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
 316                 pp->dtl_curr = dtl;
 317         }
 318
 319         /* Register the DTL for the current (boot) cpu */
 320         dtl = get_paca()->dispatch_log;
 321         get_paca()->dtl_ridx = 0;
 322         get_paca()->dtl_curr = dtl;
 323         get_paca()->lppaca_ptr->dtl_idx = 0;
 324
 325         /* hypervisor reads buffer length from this field */
 326         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 327         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 328         if (ret)
 329                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
 330                        "with %d\n", smp_processor_id(),
 331                        hard_smp_processor_id(), ret);
 332         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
 333
 334         return 0;
 335 }
 336 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 337 static inline int alloc_dispatch_logs(void)
 338 {
 339         return 0;
 340 }
 341 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 342
 343 static int alloc_dispatch_log_kmem_cache(void)
 344 {
 345         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 346                                                 DISPATCH_LOG_BYTES, 0, NULL);
 347         if (!dtl_cache) {
 348                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 349                 pr_warn("Stolen time statistics will be unreliable\n");
 350                 return 0;
 351         }
 352
 353         return alloc_dispatch_logs();
 354 }
 355 early_initcall(alloc_dispatch_log_kmem_cache);
 356
 357 static void pseries_lpar_idle(void)
 358 {
 359         /* This would call on the cpuidle framework, and the back-end pseries
 360          * driver to  go to idle states
 361          */
 362         if (cpuidle_idle_call()) {
 363                 /* On error, execute default handler
 364                  * to go into low thread priority and possibly
 365                  * low power mode by cedeing processor to hypervisor
 366                  */
 367
 368                 /* Indicate to hypervisor that we are idle. */
 369                 get_lppaca()->idle = 1;
 370
 371                 /*
 372                  * Yield the processor to the hypervisor.  We return if
 373                  * an external interrupt occurs (which are driven prior
 374                  * to returning here) or if a prod occurs from another
 375                  * processor. When returning here, external interrupts
 376                  * are enabled.
 377                  */
 378                 cede_processor();
 379
 380                 get_lppaca()->idle = 0;
 381         }
 382 }
 383
 384 /*
 385  * Enable relocation on during exceptions. This has partition wide scope and
 386  * may take a while to complete, if it takes longer than one second we will
 387  * just give up rather than wasting any more time on this - if that turns out
 388  * to ever be a problem in practice we can move this into a kernel thread to
 389  * finish off the process later in boot.
 390  */
 391 long pSeries_enable_reloc_on_exc(void)
 392 {
 393         long rc;
 394         unsigned int delay, total_delay = 0;
 395
 396         while (1) {
 397                 rc = enable_reloc_on_exceptions();
 398                 if (!H_IS_LONG_BUSY(rc))
 399                         return rc;
 400
 401                 delay = get_longbusy_msecs(rc);
 402                 total_delay += delay;
 403                 if (total_delay > 1000) {
 404                         pr_warn("Warning: Giving up waiting to enable "
 405                                 "relocation on exceptions (%u msec)!\n",
 406                                 total_delay);
 407                         return rc;
 408                 }
 409
 410                 mdelay(delay);
 411         }
 412 }
 413 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
 414
 415 long pSeries_disable_reloc_on_exc(void)
 416 {
 417         long rc;
 418
 419         while (1) {
 420                 rc = disable_reloc_on_exceptions();
 421                 if (!H_IS_LONG_BUSY(rc))
 422                         return rc;
 423                 mdelay(get_longbusy_msecs(rc));
 424         }
 425 }
 426 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
 427
 428 #ifdef CONFIG_KEXEC
 429 static void pSeries_machine_kexec(struct kimage *image)
 430 {
 431         long rc;
 432
 433         if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
 434             (image->type != KEXEC_TYPE_CRASH)) {
 435                 rc = pSeries_disable_reloc_on_exc();
 436                 if (rc != H_SUCCESS)
 437                         pr_warning("Warning: Failed to disable relocation on "
 438                                    "exceptions: %ld\n", rc);
 439         }
 440
 441         default_machine_kexec(image);
 442 }
 443 #endif
 444
 445 #ifdef __LITTLE_ENDIAN__
 446 long pseries_big_endian_exceptions(void)
 447 {
 448         long rc;
 449
 450         while (1) {
 451                 rc = enable_big_endian_exceptions();
 452                 if (!H_IS_LONG_BUSY(rc))
 453                         return rc;
 454                 mdelay(get_longbusy_msecs(rc));
 455         }
 456 }
 457
 458 static long pseries_little_endian_exceptions(void)
 459 {
 460         long rc;
 461
 462         while (1) {
 463                 rc = enable_little_endian_exceptions();
 464                 if (!H_IS_LONG_BUSY(rc))
 465                         return rc;
 466                 mdelay(get_longbusy_msecs(rc));
 467         }
 468 }
 469 #endif
 470
 471 static void __init pSeries_setup_arch(void)
 472 {
 473         panic_timeout = 10;
 474
 475         /* Discover PIC type and setup ppc_md accordingly */
 476         pseries_discover_pic();
 477
 478         /* openpic global configuration register (64-bit format). */
 479         /* openpic Interrupt Source Unit pointer (64-bit format). */
 480         /* python0 facility area (mmio) (64-bit format) REAL address. */
 481
 482         /* init to some ~sane value until calibrate_delay() runs */
 483         loops_per_jiffy = 50000000;
 484
 485         fwnmi_init();
 486
 487         /* By default, only probe PCI (can be overriden by rtas_pci) */
 488         pci_add_flags(PCI_PROBE_ONLY);
 489
 490         /* Find and initialize PCI host bridges */
 491         init_pci_config_tokens();
 492         find_and_init_phbs();
 493         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 494
 495         pSeries_nvram_init();
 496
 497         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 498                 vpa_init(boot_cpuid);
 499                 ppc_md.power_save = pseries_lpar_idle;
 500                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 501         } else {
 502                 /* No special idle routine */
 503                 ppc_md.enable_pmcs = power4_enable_pmcs;
 504         }
 505
 506         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 507
 508         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 509                 long rc;
 510                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
 511                         pr_warn("Unable to enable relocation on exceptions: "
 512                                 "%ld\n", rc);
 513                 }
 514         }
 515 }
 516
 517 static int __init pSeries_init_panel(void)
 518 {
 519         /* Manually leave the kernel version on the panel. */
 520         ppc_md.progress("Linux ppc64\n", 0);
 521         ppc_md.progress(init_utsname()->version, 0);
 522
 523         return 0;
 524 }
 525 machine_arch_initcall(pseries, pSeries_init_panel);
 526
 527 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 528 {
 529         return plpar_hcall_norets(H_SET_DABR, dabr);
 530 }
 531
 532 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 533 {
 534         /* Have to set at least one bit in the DABRX according to PAPR */
 535         if (dabrx == 0 && dabr == 0)
 536                 dabrx = DABRX_USER;
 537         /* PAPR says we can only set kernel and user bits */
 538         dabrx &= DABRX_KERNEL | DABRX_USER;
 539
 540         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 541 }
 542
 543 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
 544 {
 545         /* PAPR says we can't set HYP */
 546         dawrx &= ~DAWRX_HYP;
 547
 548         return  plapr_set_watchpoint0(dawr, dawrx);
 549 }
 550
 551 #define CMO_CHARACTERISTICS_TOKEN 44
 552 #define CMO_MAXLENGTH 1026
 553
 554 void pSeries_coalesce_init(void)
 555 {
 556         struct hvcall_mpp_x_data mpp_x_data;
 557
 558         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 559                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 560         else
 561                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 562 }
 563
 564 /**
 565  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 566  * handle that here. (Stolen from parse_system_parameter_string)
 567  */
 568 void pSeries_cmo_feature_init(void)
 569 {
 570         char *ptr, *key, *value, *end;
 571         int call_status;
 572         int page_order = IOMMU_PAGE_SHIFT;
 573
 574         pr_debug(" -> fw_cmo_feature_init()\n");
 575         spin_lock(&rtas_data_buf_lock);
 576         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 577         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 578                                 NULL,
 579                                 CMO_CHARACTERISTICS_TOKEN,
 580                                 __pa(rtas_data_buf),
 581                                 RTAS_DATA_BUF_SIZE);
 582
 583         if (call_status != 0) {
 584                 spin_unlock(&rtas_data_buf_lock);
 585                 pr_debug("CMO not available\n");
 586                 pr_debug(" <- fw_cmo_feature_init()\n");
 587                 return;
 588         }
 589
 590         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 591         ptr = rtas_data_buf + 2;        /* step over strlen value */
 592         key = value = ptr;
 593
 594         while (*ptr && (ptr <= end)) {
 595                 /* Separate the key and value by replacing '=' with '\0' and
 596                  * point the value at the string after the '='
 597                  */
 598                 if (ptr[0] == '=') {
 599                         ptr[0] = '\0';
 600                         value = ptr + 1;
 601                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 602                         /* Terminate the string containing the key/value pair */
 603                         ptr[0] = '\0';
 604
 605                         if (key == value) {
 606                                 pr_debug("Malformed key/value pair\n");
 607                                 /* Never found a '=', end processing */
 608                                 break;
 609                         }
 610
 611                         if (0 == strcmp(key, "CMOPageSize"))
 612                                 page_order = simple_strtol(value, NULL, 10);
 613                         else if (0 == strcmp(key, "PrPSP"))
 614                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 615                         else if (0 == strcmp(key, "SecPSP"))
 616                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 617                         value = key = ptr + 1;
 618                 }
 619                 ptr++;
 620         }
 621
 622         /* Page size is returned as the power of 2 of the page size,
 623          * convert to the page size in bytes before returning
 624          */
 625         CMO_PageSize = 1 << page_order;
 626         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 627
 628         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 629                 pr_info("CMO enabled\n");
 630                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 631                          CMO_SecPSP);
 632                 powerpc_firmware_features |= FW_FEATURE_CMO;
 633                 pSeries_coalesce_init();
 634         } else
 635                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 636                          CMO_SecPSP);
 637         spin_unlock(&rtas_data_buf_lock);
 638         pr_debug(" <- fw_cmo_feature_init()\n");
 639 }
 640
 641 /*
 642  * Early initialization.  Relocation is on but do not reference unbolted pages
 643  */
 644 static void __init pSeries_init_early(void)
 645 {
 646         pr_debug(" -> pSeries_init_early()\n");
 647
 648 #ifdef CONFIG_HVC_CONSOLE
 649         if (firmware_has_feature(FW_FEATURE_LPAR))
 650                 hvc_vio_init_early();
 651 #endif
 652         if (firmware_has_feature(FW_FEATURE_XDABR))
 653                 ppc_md.set_dabr = pseries_set_xdabr;
 654         else if (firmware_has_feature(FW_FEATURE_DABR))
 655                 ppc_md.set_dabr = pseries_set_dabr;
 656
 657         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 658                 ppc_md.set_dawr = pseries_set_dawr;
 659
 660         pSeries_cmo_feature_init();
 661         iommu_init_early_pSeries();
 662
 663         pr_debug(" <- pSeries_init_early()\n");
 664 }
 665
 666 /*
 667  * Called very early, MMU is off, device-tree isn't unflattened
 668  */
 669
 670 static int __init pseries_probe_fw_features(unsigned long node,
 671                                             const char *uname, int depth,
 672                                             void *data)
 673 {
 674         const char *prop;
 675         unsigned long len;
 676         static int hypertas_found;
 677         static int vec5_found;
 678
 679         if (depth != 1)
 680                 return 0;
 681
 682         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 683                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 684                                            &len);
 685                 if (prop) {
 686                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 687                         fw_hypertas_feature_init(prop, len);
 688                 }
 689
 690                 hypertas_found = 1;
 691         }
 692
 693         if (!strcmp(uname, "chosen")) {
 694                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 695                                            &len);
 696                 if (prop)
 697                         fw_vec5_feature_init(prop, len);
 698
 699                 vec5_found = 1;
 700         }
 701
 702         return hypertas_found && vec5_found;
 703 }
 704
 705 static int __init pSeries_probe(void)
 706 {
 707         unsigned long root = of_get_flat_dt_root();
 708         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 709
 710         if (dtype == NULL)
 711                 return 0;
 712         if (strcmp(dtype, "chrp"))
 713                 return 0;
 714
 715         /* Cell blades firmware claims to be chrp while it's not. Until this
 716          * is fixed, we need to avoid those here.
 717          */
 718         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 719             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 720                 return 0;
 721
 722         pr_debug("pSeries detected, looking for LPAR capability...\n");
 723
 724         /* Now try to figure out if we are running on LPAR */
 725         of_scan_flat_dt(pseries_probe_fw_features, NULL);
 726
 727 #ifdef __LITTLE_ENDIAN__
 728         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 729                 long rc;
 730                 /*
 731                  * Tell the hypervisor that we want our exceptions to
 732                  * be taken in little endian mode. If this fails we don't
 733                  * want to use BUG() because it will trigger an exception.
 734                  */
 735                 rc = pseries_little_endian_exceptions();
 736                 if (rc) {
 737                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
 738                         panic("Could not enable little endian exceptions");
 739                 }
 740         }
 741 #endif
 742
 743         if (firmware_has_feature(FW_FEATURE_LPAR))
 744                 hpte_init_lpar();
 745         else
 746                 hpte_init_native();
 747
 748         pr_debug("Machine is%s LPAR !\n",
 749                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 750
 751         return 1;
 752 }
 753
 754 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 755 {
 756         if (firmware_has_feature(FW_FEATURE_LPAR))
 757                 return PCI_PROBE_DEVTREE;
 758         return PCI_PROBE_NORMAL;
 759 }
 760
 761 /**
 762  * pSeries_power_off - tell firmware about how to power off the system.
 763  *
 764  * This function calls either the power-off rtas token in normal cases
 765  * or the ibm,power-off-ups token (if present & requested) in case of
 766  * a power failure. If power-off token is used, power on will only be
 767  * possible with power button press. If ibm,power-off-ups token is used
 768  * it will allow auto poweron after power is restored.
 769  */
 770 static void pSeries_power_off(void)
 771 {
 772         int rc;
 773         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 774
 775         if (rtas_flash_term_hook)
 776                 rtas_flash_term_hook(SYS_POWER_OFF);
 777
 778         if (rtas_poweron_auto == 0 ||
 779                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 780                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 781                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 782         } else {
 783                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 784                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 785         }
 786         for (;;);
 787 }
 788
 789 #ifndef CONFIG_PCI
 790 void pSeries_final_fixup(void) { }
 791 #endif
 792
 793 define_machine(pseries) {
 794         .name                   = "pSeries",
 795         .probe                  = pSeries_probe,
 796         .setup_arch             = pSeries_setup_arch,
 797         .init_early             = pSeries_init_early,
 798         .show_cpuinfo           = pSeries_show_cpuinfo,
 799         .log_error              = pSeries_log_error,
 800         .pcibios_fixup          = pSeries_final_fixup,
 801         .pci_probe_mode         = pSeries_pci_probe_mode,
 802         .restart                = rtas_restart,
 803         .power_off              = pSeries_power_off,
 804         .halt                   = rtas_halt,
 805         .panic                  = rtas_os_term,
 806         .get_boot_time          = rtas_get_boot_time,
 807         .get_rtc_time           = rtas_get_rtc_time,
 808         .set_rtc_time           = rtas_set_rtc_time,
 809         .calibrate_decr         = generic_calibrate_decr,
 810         .progress               = rtas_progress,
 811         .system_reset_exception = pSeries_system_reset_exception,
 812         .machine_check_exception = pSeries_machine_check_exception,
 813 #ifdef CONFIG_KEXEC
 814         .machine_kexec          = pSeries_machine_kexec,
 815 #endif
 816 };