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
  70 #include "plpar_wrappers.h"
  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 != 0) {
 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 *data)
 257 {
 258         struct of_reconfig_data *rd = data;
 259         struct device_node *np = rd->dn;
 260         struct pci_dn *pci = NULL;
 261         int err = NOTIFY_OK;
 262
 263         switch (action) {
 264         case OF_RECONFIG_ATTACH_NODE:
 265                 pci = np->parent->data;
 266                 if (pci) {
 267                         update_dn_pci_info(np, pci->phb);
 268
 269                         /* Create EEH device for the OF node */
 270                         eeh_dev_init(np, pci->phb);
 271                 }
 272                 break;
 273         default:
 274                 err = NOTIFY_DONE;
 275                 break;
 276         }
 277         return err;
 278 }
 279
 280 static struct notifier_block pci_dn_reconfig_nb = {
 281         .notifier_call = pci_dn_reconfig_notifier,
 282 };
 283
 284 struct kmem_cache *dtl_cache;
 285
 286 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 287 /*
 288  * Allocate space for the dispatch trace log for all possible cpus
 289  * and register the buffers with the hypervisor.  This is used for
 290  * computing time stolen by the hypervisor.
 291  */
 292 static int alloc_dispatch_logs(void)
 293 {
 294         int cpu, ret;
 295         struct paca_struct *pp;
 296         struct dtl_entry *dtl;
 297
 298         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 299                 return 0;
 300
 301         if (!dtl_cache)
 302                 return 0;
 303
 304         for_each_possible_cpu(cpu) {
 305                 pp = &paca[cpu];
 306                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
 307                 if (!dtl) {
 308                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
 309                                 cpu);
 310                         pr_warn("Stolen time statistics will be unreliable\n");
 311                         break;
 312                 }
 313
 314                 pp->dtl_ridx = 0;
 315                 pp->dispatch_log = dtl;
 316                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
 317                 pp->dtl_curr = dtl;
 318         }
 319
 320         /* Register the DTL for the current (boot) cpu */
 321         dtl = get_paca()->dispatch_log;
 322         get_paca()->dtl_ridx = 0;
 323         get_paca()->dtl_curr = dtl;
 324         get_paca()->lppaca_ptr->dtl_idx = 0;
 325
 326         /* hypervisor reads buffer length from this field */
 327         dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
 328         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 329         if (ret)
 330                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
 331                        "with %d\n", smp_processor_id(),
 332                        hard_smp_processor_id(), ret);
 333         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
 334
 335         return 0;
 336 }
 337 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 338 static inline int alloc_dispatch_logs(void)
 339 {
 340         return 0;
 341 }
 342 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 343
 344 static int alloc_dispatch_log_kmem_cache(void)
 345 {
 346         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 347                                                 DISPATCH_LOG_BYTES, 0, NULL);
 348         if (!dtl_cache) {
 349                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 350                 pr_warn("Stolen time statistics will be unreliable\n");
 351                 return 0;
 352         }
 353
 354         return alloc_dispatch_logs();
 355 }
 356 early_initcall(alloc_dispatch_log_kmem_cache);
 357
 358 static void pseries_lpar_idle(void)
 359 {
 360         /* This would call on the cpuidle framework, and the back-end pseries
 361          * driver to  go to idle states
 362          */
 363         if (cpuidle_idle_call()) {
 364                 /* On error, execute default handler
 365                  * to go into low thread priority and possibly
 366                  * low power mode by cedeing processor to hypervisor
 367                  */
 368
 369                 /* Indicate to hypervisor that we are idle. */
 370                 get_lppaca()->idle = 1;
 371
 372                 /*
 373                  * Yield the processor to the hypervisor.  We return if
 374                  * an external interrupt occurs (which are driven prior
 375                  * to returning here) or if a prod occurs from another
 376                  * processor. When returning here, external interrupts
 377                  * are enabled.
 378                  */
 379                 cede_processor();
 380
 381                 get_lppaca()->idle = 0;
 382         }
 383 }
 384
 385 /*
 386  * Enable relocation on during exceptions. This has partition wide scope and
 387  * may take a while to complete, if it takes longer than one second we will
 388  * just give up rather than wasting any more time on this - if that turns out
 389  * to ever be a problem in practice we can move this into a kernel thread to
 390  * finish off the process later in boot.
 391  */
 392 long pSeries_enable_reloc_on_exc(void)
 393 {
 394         long rc;
 395         unsigned int delay, total_delay = 0;
 396
 397         while (1) {
 398                 rc = enable_reloc_on_exceptions();
 399                 if (!H_IS_LONG_BUSY(rc))
 400                         return rc;
 401
 402                 delay = get_longbusy_msecs(rc);
 403                 total_delay += delay;
 404                 if (total_delay > 1000) {
 405                         pr_warn("Warning: Giving up waiting to enable "
 406                                 "relocation on exceptions (%u msec)!\n",
 407                                 total_delay);
 408                         return rc;
 409                 }
 410
 411                 mdelay(delay);
 412         }
 413 }
 414 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
 415
 416 long pSeries_disable_reloc_on_exc(void)
 417 {
 418         long rc;
 419
 420         while (1) {
 421                 rc = disable_reloc_on_exceptions();
 422                 if (!H_IS_LONG_BUSY(rc))
 423                         return rc;
 424                 mdelay(get_longbusy_msecs(rc));
 425         }
 426 }
 427 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
 428
 429 #ifdef CONFIG_KEXEC
 430 static void pSeries_machine_kexec(struct kimage *image)
 431 {
 432         long rc;
 433
 434         if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
 435             (image->type != KEXEC_TYPE_CRASH)) {
 436                 rc = pSeries_disable_reloc_on_exc();
 437                 if (rc != H_SUCCESS)
 438                         pr_warning("Warning: Failed to disable relocation on "
 439                                    "exceptions: %ld\n", rc);
 440         }
 441
 442         default_machine_kexec(image);
 443 }
 444 #endif
 445
 446 static void __init pSeries_setup_arch(void)
 447 {
 448         panic_timeout = 10;
 449
 450         /* Discover PIC type and setup ppc_md accordingly */
 451         pseries_discover_pic();
 452
 453         /* openpic global configuration register (64-bit format). */
 454         /* openpic Interrupt Source Unit pointer (64-bit format). */
 455         /* python0 facility area (mmio) (64-bit format) REAL address. */
 456
 457         /* init to some ~sane value until calibrate_delay() runs */
 458         loops_per_jiffy = 50000000;
 459
 460         fwnmi_init();
 461
 462         /* By default, only probe PCI (can be overriden by rtas_pci) */
 463         pci_add_flags(PCI_PROBE_ONLY);
 464
 465         /* Find and initialize PCI host bridges */
 466         init_pci_config_tokens();
 467         find_and_init_phbs();
 468         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 469
 470         pSeries_nvram_init();
 471
 472         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 473                 vpa_init(boot_cpuid);
 474                 ppc_md.power_save = pseries_lpar_idle;
 475                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 476         } else {
 477                 /* No special idle routine */
 478                 ppc_md.enable_pmcs = power4_enable_pmcs;
 479         }
 480
 481         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 482
 483         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 484                 long rc;
 485                 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
 486                         pr_warn("Unable to enable relocation on exceptions: "
 487                                 "%ld\n", rc);
 488                 }
 489         }
 490 }
 491
 492 static int __init pSeries_init_panel(void)
 493 {
 494         /* Manually leave the kernel version on the panel. */
 495         ppc_md.progress("Linux ppc64\n", 0);
 496         ppc_md.progress(init_utsname()->version, 0);
 497
 498         return 0;
 499 }
 500 machine_arch_initcall(pseries, pSeries_init_panel);
 501
 502 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 503 {
 504         return plpar_hcall_norets(H_SET_DABR, dabr);
 505 }
 506
 507 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 508 {
 509         /* Have to set at least one bit in the DABRX according to PAPR */
 510         if (dabrx == 0 && dabr == 0)
 511                 dabrx = DABRX_USER;
 512         /* PAPR says we can only set kernel and user bits */
 513         dabrx &= DABRX_KERNEL | DABRX_USER;
 514
 515         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 516 }
 517
 518 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
 519 {
 520         /* PAPR says we can't set HYP */
 521         dawrx &= ~DAWRX_HYP;
 522
 523         return  plapr_set_watchpoint0(dawr, dawrx);
 524 }
 525
 526 #define CMO_CHARACTERISTICS_TOKEN 44
 527 #define CMO_MAXLENGTH 1026
 528
 529 void pSeries_coalesce_init(void)
 530 {
 531         struct hvcall_mpp_x_data mpp_x_data;
 532
 533         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 534                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 535         else
 536                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 537 }
 538
 539 /**
 540  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 541  * handle that here. (Stolen from parse_system_parameter_string)
 542  */
 543 void pSeries_cmo_feature_init(void)
 544 {
 545         char *ptr, *key, *value, *end;
 546         int call_status;
 547         int page_order = IOMMU_PAGE_SHIFT;
 548
 549         pr_debug(" -> fw_cmo_feature_init()\n");
 550         spin_lock(&rtas_data_buf_lock);
 551         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 552         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 553                                 NULL,
 554                                 CMO_CHARACTERISTICS_TOKEN,
 555                                 __pa(rtas_data_buf),
 556                                 RTAS_DATA_BUF_SIZE);
 557
 558         if (call_status != 0) {
 559                 spin_unlock(&rtas_data_buf_lock);
 560                 pr_debug("CMO not available\n");
 561                 pr_debug(" <- fw_cmo_feature_init()\n");
 562                 return;
 563         }
 564
 565         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 566         ptr = rtas_data_buf + 2;        /* step over strlen value */
 567         key = value = ptr;
 568
 569         while (*ptr && (ptr <= end)) {
 570                 /* Separate the key and value by replacing '=' with '\0' and
 571                  * point the value at the string after the '='
 572                  */
 573                 if (ptr[0] == '=') {
 574                         ptr[0] = '\0';
 575                         value = ptr + 1;
 576                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 577                         /* Terminate the string containing the key/value pair */
 578                         ptr[0] = '\0';
 579
 580                         if (key == value) {
 581                                 pr_debug("Malformed key/value pair\n");
 582                                 /* Never found a '=', end processing */
 583                                 break;
 584                         }
 585
 586                         if (0 == strcmp(key, "CMOPageSize"))
 587                                 page_order = simple_strtol(value, NULL, 10);
 588                         else if (0 == strcmp(key, "PrPSP"))
 589                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 590                         else if (0 == strcmp(key, "SecPSP"))
 591                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 592                         value = key = ptr + 1;
 593                 }
 594                 ptr++;
 595         }
 596
 597         /* Page size is returned as the power of 2 of the page size,
 598          * convert to the page size in bytes before returning
 599          */
 600         CMO_PageSize = 1 << page_order;
 601         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 602
 603         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 604                 pr_info("CMO enabled\n");
 605                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 606                          CMO_SecPSP);
 607                 powerpc_firmware_features |= FW_FEATURE_CMO;
 608                 pSeries_coalesce_init();
 609         } else
 610                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 611                          CMO_SecPSP);
 612         spin_unlock(&rtas_data_buf_lock);
 613         pr_debug(" <- fw_cmo_feature_init()\n");
 614 }
 615
 616 /*
 617  * Early initialization.  Relocation is on but do not reference unbolted pages
 618  */
 619 static void __init pSeries_init_early(void)
 620 {
 621         pr_debug(" -> pSeries_init_early()\n");
 622
 623 #ifdef CONFIG_HVC_CONSOLE
 624         if (firmware_has_feature(FW_FEATURE_LPAR))
 625                 hvc_vio_init_early();
 626 #endif
 627         if (firmware_has_feature(FW_FEATURE_XDABR))
 628                 ppc_md.set_dabr = pseries_set_xdabr;
 629         else if (firmware_has_feature(FW_FEATURE_DABR))
 630                 ppc_md.set_dabr = pseries_set_dabr;
 631
 632         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 633                 ppc_md.set_dawr = pseries_set_dawr;
 634
 635         pSeries_cmo_feature_init();
 636         iommu_init_early_pSeries();
 637
 638         pr_debug(" <- pSeries_init_early()\n");
 639 }
 640
 641 /*
 642  * Called very early, MMU is off, device-tree isn't unflattened
 643  */
 644
 645 static int __init pseries_probe_fw_features(unsigned long node,
 646                                             const char *uname, int depth,
 647                                             void *data)
 648 {
 649         const char *prop;
 650         int len;
 651         static int hypertas_found;
 652         static int vec5_found;
 653
 654         if (depth != 1)
 655                 return 0;
 656
 657         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 658                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 659                                            &len);
 660                 if (prop) {
 661                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 662                         fw_hypertas_feature_init(prop, len);
 663                 }
 664
 665                 hypertas_found = 1;
 666         }
 667
 668         if (!strcmp(uname, "chosen")) {
 669                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 670                                            &len);
 671                 if (prop)
 672                         fw_vec5_feature_init(prop, len);
 673
 674                 vec5_found = 1;
 675         }
 676
 677         return hypertas_found && vec5_found;
 678 }
 679
 680 static int __init pSeries_probe(void)
 681 {
 682         unsigned long root = of_get_flat_dt_root();
 683         const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 684
 685         if (dtype == NULL)
 686                 return 0;
 687         if (strcmp(dtype, "chrp"))
 688                 return 0;
 689
 690         /* Cell blades firmware claims to be chrp while it's not. Until this
 691          * is fixed, we need to avoid those here.
 692          */
 693         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 694             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 695                 return 0;
 696
 697         pr_debug("pSeries detected, looking for LPAR capability...\n");
 698
 699         /* Now try to figure out if we are running on LPAR */
 700         of_scan_flat_dt(pseries_probe_fw_features, NULL);
 701
 702         if (firmware_has_feature(FW_FEATURE_LPAR))
 703                 hpte_init_lpar();
 704         else
 705                 hpte_init_native();
 706
 707         pr_debug("Machine is%s LPAR !\n",
 708                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 709
 710         return 1;
 711 }
 712
 713 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 714 {
 715         if (firmware_has_feature(FW_FEATURE_LPAR))
 716                 return PCI_PROBE_DEVTREE;
 717         return PCI_PROBE_NORMAL;
 718 }
 719
 720 /**
 721  * pSeries_power_off - tell firmware about how to power off the system.
 722  *
 723  * This function calls either the power-off rtas token in normal cases
 724  * or the ibm,power-off-ups token (if present & requested) in case of
 725  * a power failure. If power-off token is used, power on will only be
 726  * possible with power button press. If ibm,power-off-ups token is used
 727  * it will allow auto poweron after power is restored.
 728  */
 729 static void pSeries_power_off(void)
 730 {
 731         int rc;
 732         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 733
 734         if (rtas_flash_term_hook)
 735                 rtas_flash_term_hook(SYS_POWER_OFF);
 736
 737         if (rtas_poweron_auto == 0 ||
 738                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 739                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 740                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 741         } else {
 742                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 743                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 744         }
 745         for (;;);
 746 }
 747
 748 #ifndef CONFIG_PCI
 749 void pSeries_final_fixup(void) { }
 750 #endif
 751
 752 define_machine(pseries) {
 753         .name                   = "pSeries",
 754         .probe                  = pSeries_probe,
 755         .setup_arch             = pSeries_setup_arch,
 756         .init_early             = pSeries_init_early,
 757         .show_cpuinfo           = pSeries_show_cpuinfo,
 758         .log_error              = pSeries_log_error,
 759         .pcibios_fixup          = pSeries_final_fixup,
 760         .pci_probe_mode         = pSeries_pci_probe_mode,
 761         .restart                = rtas_restart,
 762         .power_off              = pSeries_power_off,
 763         .halt                   = rtas_halt,
 764         .panic                  = rtas_os_term,
 765         .get_boot_time          = rtas_get_boot_time,
 766         .get_rtc_time           = rtas_get_rtc_time,
 767         .set_rtc_time           = rtas_set_rtc_time,
 768         .calibrate_decr         = generic_calibrate_decr,
 769         .progress               = rtas_progress,
 770         .system_reset_exception = pSeries_system_reset_exception,
 771         .machine_check_exception = pSeries_machine_check_exception,
 772 #ifdef CONFIG_KEXEC
 773         .machine_kexec          = pSeries_machine_kexec,
 774 #endif
 775 };