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/of.h>
  43 #include <linux/of_pci.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_4K);
  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_each_node_by_name(np, "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 *data)
 256 {
 257         struct of_reconfig_data *rd = data;
 258         struct device_node *parent, *np = rd->dn;
 259         struct pci_dn *pdn;
 260         int err = NOTIFY_OK;
 261
 262         switch (action) {
 263         case OF_RECONFIG_ATTACH_NODE:
 264                 parent = of_get_parent(np);
 265                 pdn = parent ? PCI_DN(parent) : NULL;
 266                 if (pdn) {
 267                         /* Create pdn and EEH device */
 268                         update_dn_pci_info(np, pdn->phb);
 269                         eeh_dev_init(PCI_DN(np), pdn->phb);
 270                 }
 271
 272                 of_node_put(parent);
 273                 break;
 274         case OF_RECONFIG_DETACH_NODE:
 275                 pdn = PCI_DN(np);
 276                 if (pdn)
 277                         list_del(&pdn->list);
 278                 break;
 279         default:
 280                 err = NOTIFY_DONE;
 281                 break;
 282         }
 283         return err;
 284 }
 285
 286 static struct notifier_block pci_dn_reconfig_nb = {
 287         .notifier_call = pci_dn_reconfig_notifier,
 288 };
 289
 290 struct kmem_cache *dtl_cache;
 291
 292 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 293 /*
 294  * Allocate space for the dispatch trace log for all possible cpus
 295  * and register the buffers with the hypervisor.  This is used for
 296  * computing time stolen by the hypervisor.
 297  */
 298 static int alloc_dispatch_logs(void)
 299 {
 300         int cpu, ret;
 301         struct paca_struct *pp;
 302         struct dtl_entry *dtl;
 303
 304         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 305                 return 0;
 306
 307         if (!dtl_cache)
 308                 return 0;
 309
 310         for_each_possible_cpu(cpu) {
 311                 pp = &paca[cpu];
 312                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
 313                 if (!dtl) {
 314                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
 315                                 cpu);
 316                         pr_warn("Stolen time statistics will be unreliable\n");
 317                         break;
 318                 }
 319
 320                 pp->dtl_ridx = 0;
 321                 pp->dispatch_log = dtl;
 322                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
 323                 pp->dtl_curr = dtl;
 324         }
 325
 326         /* Register the DTL for the current (boot) cpu */
 327         dtl = get_paca()->dispatch_log;
 328         get_paca()->dtl_ridx = 0;
 329         get_paca()->dtl_curr = dtl;
 330         get_paca()->lppaca_ptr->dtl_idx = 0;
 331
 332         /* hypervisor reads buffer length from this field */
 333         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 334         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 335         if (ret)
 336                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
 337                        "with %d\n", smp_processor_id(),
 338                        hard_smp_processor_id(), ret);
 339         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
 340
 341         return 0;
 342 }
 343 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 344 static inline int alloc_dispatch_logs(void)
 345 {
 346         return 0;
 347 }
 348 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 349
 350 static int alloc_dispatch_log_kmem_cache(void)
 351 {
 352         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 353                                                 DISPATCH_LOG_BYTES, 0, NULL);
 354         if (!dtl_cache) {
 355                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 356                 pr_warn("Stolen time statistics will be unreliable\n");
 357                 return 0;
 358         }
 359
 360         return alloc_dispatch_logs();
 361 }
 362 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
 363
 364 static void pseries_lpar_idle(void)
 365 {
 366         /*
 367          * Default handler to go into low thread priority and possibly
 368          * low power mode by cedeing processor to hypervisor
 369          */
 370
 371         /* Indicate to hypervisor that we are idle. */
 372         get_lppaca()->idle = 1;
 373
 374         /*
 375          * Yield the processor to the hypervisor.  We return if
 376          * an external interrupt occurs (which are driven prior
 377          * to returning here) or if a prod occurs from another
 378          * processor. When returning here, external interrupts
 379          * are enabled.
 380          */
 381         cede_processor();
 382
 383         get_lppaca()->idle = 0;
 384 }
 385
 386 /*
 387  * Enable relocation on during exceptions. This has partition wide scope and
 388  * may take a while to complete, if it takes longer than one second we will
 389  * just give up rather than wasting any more time on this - if that turns out
 390  * to ever be a problem in practice we can move this into a kernel thread to
 391  * finish off the process later in boot.
 392  */
 393 long pSeries_enable_reloc_on_exc(void)
 394 {
 395         long rc;
 396         unsigned int delay, total_delay = 0;
 397
 398         while (1) {
 399                 rc = enable_reloc_on_exceptions();
 400                 if (!H_IS_LONG_BUSY(rc))
 401                         return rc;
 402
 403                 delay = get_longbusy_msecs(rc);
 404                 total_delay += delay;
 405                 if (total_delay > 1000) {
 406                         pr_warn("Warning: Giving up waiting to enable "
 407                                 "relocation on exceptions (%u msec)!\n",
 408                                 total_delay);
 409                         return rc;
 410                 }
 411
 412                 mdelay(delay);
 413         }
 414 }
 415 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
 416
 417 long pSeries_disable_reloc_on_exc(void)
 418 {
 419         long rc;
 420
 421         while (1) {
 422                 rc = disable_reloc_on_exceptions();
 423                 if (!H_IS_LONG_BUSY(rc))
 424                         return rc;
 425                 mdelay(get_longbusy_msecs(rc));
 426         }
 427 }
 428 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
 429
 430 #ifdef CONFIG_KEXEC
 431 static void pSeries_machine_kexec(struct kimage *image)
 432 {
 433         long rc;
 434
 435         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 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 #ifdef __LITTLE_ENDIAN__
 447 long pseries_big_endian_exceptions(void)
 448 {
 449         long rc;
 450
 451         while (1) {
 452                 rc = enable_big_endian_exceptions();
 453                 if (!H_IS_LONG_BUSY(rc))
 454                         return rc;
 455                 mdelay(get_longbusy_msecs(rc));
 456         }
 457 }
 458
 459 static long pseries_little_endian_exceptions(void)
 460 {
 461         long rc;
 462
 463         while (1) {
 464                 rc = enable_little_endian_exceptions();
 465                 if (!H_IS_LONG_BUSY(rc))
 466                         return rc;
 467                 mdelay(get_longbusy_msecs(rc));
 468         }
 469 }
 470 #endif
 471
 472 static void __init find_and_init_phbs(void)
 473 {
 474         struct device_node *node;
 475         struct pci_controller *phb;
 476         struct device_node *root = of_find_node_by_path("/");
 477
 478         for_each_child_of_node(root, node) {
 479                 if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
 480                                            strcmp(node->type, "pciex") != 0))
 481                         continue;
 482
 483                 phb = pcibios_alloc_controller(node);
 484                 if (!phb)
 485                         continue;
 486                 rtas_setup_phb(phb);
 487                 pci_process_bridge_OF_ranges(phb, node, 0);
 488                 isa_bridge_find_early(phb);
 489                 phb->controller_ops = pseries_pci_controller_ops;
 490         }
 491
 492         of_node_put(root);
 493         pci_devs_phb_init();
 494
 495         /*
 496          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
 497          * in chosen.
 498          */
 499         of_pci_check_probe_only();
 500 }
 501
 502 static void __init pSeries_setup_arch(void)
 503 {
 504         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
 505
 506         /* Discover PIC type and setup ppc_md accordingly */
 507         pseries_discover_pic();
 508
 509         /* openpic global configuration register (64-bit format). */
 510         /* openpic Interrupt Source Unit pointer (64-bit format). */
 511         /* python0 facility area (mmio) (64-bit format) REAL address. */
 512
 513         /* init to some ~sane value until calibrate_delay() runs */
 514         loops_per_jiffy = 50000000;
 515
 516         fwnmi_init();
 517
 518         /* By default, only probe PCI (can be overriden by rtas_pci) */
 519         pci_add_flags(PCI_PROBE_ONLY);
 520
 521         /* Find and initialize PCI host bridges */
 522         init_pci_config_tokens();
 523         find_and_init_phbs();
 524         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 525
 526         pSeries_nvram_init();
 527
 528         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 529                 vpa_init(boot_cpuid);
 530                 ppc_md.power_save = pseries_lpar_idle;
 531                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 532         } else {
 533                 /* No special idle routine */
 534                 ppc_md.enable_pmcs = power4_enable_pmcs;
 535         }
 536
 537         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 538
 539         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 540                 long rc;
 541
 542                 rc = pSeries_enable_reloc_on_exc();
 543                 if (rc == H_P2) {
 544                         pr_info("Relocation on exceptions not supported\n");
 545                 } else if (rc != H_SUCCESS) {
 546                         pr_warn("Unable to enable relocation on exceptions: "
 547                                 "%ld\n", rc);
 548                 }
 549         }
 550 }
 551
 552 static int __init pSeries_init_panel(void)
 553 {
 554         /* Manually leave the kernel version on the panel. */
 555 #ifdef __BIG_ENDIAN__
 556         ppc_md.progress("Linux ppc64\n", 0);
 557 #else
 558         ppc_md.progress("Linux ppc64le\n", 0);
 559 #endif
 560         ppc_md.progress(init_utsname()->version, 0);
 561
 562         return 0;
 563 }
 564 machine_arch_initcall(pseries, pSeries_init_panel);
 565
 566 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 567 {
 568         return plpar_hcall_norets(H_SET_DABR, dabr);
 569 }
 570
 571 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 572 {
 573         /* Have to set at least one bit in the DABRX according to PAPR */
 574         if (dabrx == 0 && dabr == 0)
 575                 dabrx = DABRX_USER;
 576         /* PAPR says we can only set kernel and user bits */
 577         dabrx &= DABRX_KERNEL | DABRX_USER;
 578
 579         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 580 }
 581
 582 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
 583 {
 584         /* PAPR says we can't set HYP */
 585         dawrx &= ~DAWRX_HYP;
 586
 587         return  plapr_set_watchpoint0(dawr, dawrx);
 588 }
 589
 590 #define CMO_CHARACTERISTICS_TOKEN 44
 591 #define CMO_MAXLENGTH 1026
 592
 593 void pSeries_coalesce_init(void)
 594 {
 595         struct hvcall_mpp_x_data mpp_x_data;
 596
 597         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 598                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 599         else
 600                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 601 }
 602
 603 /**
 604  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 605  * handle that here. (Stolen from parse_system_parameter_string)
 606  */
 607 static void pSeries_cmo_feature_init(void)
 608 {
 609         char *ptr, *key, *value, *end;
 610         int call_status;
 611         int page_order = IOMMU_PAGE_SHIFT_4K;
 612
 613         pr_debug(" -> fw_cmo_feature_init()\n");
 614         spin_lock(&rtas_data_buf_lock);
 615         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 616         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 617                                 NULL,
 618                                 CMO_CHARACTERISTICS_TOKEN,
 619                                 __pa(rtas_data_buf),
 620                                 RTAS_DATA_BUF_SIZE);
 621
 622         if (call_status != 0) {
 623                 spin_unlock(&rtas_data_buf_lock);
 624                 pr_debug("CMO not available\n");
 625                 pr_debug(" <- fw_cmo_feature_init()\n");
 626                 return;
 627         }
 628
 629         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 630         ptr = rtas_data_buf + 2;        /* step over strlen value */
 631         key = value = ptr;
 632
 633         while (*ptr && (ptr <= end)) {
 634                 /* Separate the key and value by replacing '=' with '\0' and
 635                  * point the value at the string after the '='
 636                  */
 637                 if (ptr[0] == '=') {
 638                         ptr[0] = '\0';
 639                         value = ptr + 1;
 640                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 641                         /* Terminate the string containing the key/value pair */
 642                         ptr[0] = '\0';
 643
 644                         if (key == value) {
 645                                 pr_debug("Malformed key/value pair\n");
 646                                 /* Never found a '=', end processing */
 647                                 break;
 648                         }
 649
 650                         if (0 == strcmp(key, "CMOPageSize"))
 651                                 page_order = simple_strtol(value, NULL, 10);
 652                         else if (0 == strcmp(key, "PrPSP"))
 653                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 654                         else if (0 == strcmp(key, "SecPSP"))
 655                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 656                         value = key = ptr + 1;
 657                 }
 658                 ptr++;
 659         }
 660
 661         /* Page size is returned as the power of 2 of the page size,
 662          * convert to the page size in bytes before returning
 663          */
 664         CMO_PageSize = 1 << page_order;
 665         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 666
 667         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 668                 pr_info("CMO enabled\n");
 669                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 670                          CMO_SecPSP);
 671                 powerpc_firmware_features |= FW_FEATURE_CMO;
 672                 pSeries_coalesce_init();
 673         } else
 674                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 675                          CMO_SecPSP);
 676         spin_unlock(&rtas_data_buf_lock);
 677         pr_debug(" <- fw_cmo_feature_init()\n");
 678 }
 679
 680 /*
 681  * Early initialization.  Relocation is on but do not reference unbolted pages
 682  */
 683 static void __init pSeries_init_early(void)
 684 {
 685         pr_debug(" -> pSeries_init_early()\n");
 686
 687 #ifdef CONFIG_HVC_CONSOLE
 688         if (firmware_has_feature(FW_FEATURE_LPAR))
 689                 hvc_vio_init_early();
 690 #endif
 691         if (firmware_has_feature(FW_FEATURE_XDABR))
 692                 ppc_md.set_dabr = pseries_set_xdabr;
 693         else if (firmware_has_feature(FW_FEATURE_DABR))
 694                 ppc_md.set_dabr = pseries_set_dabr;
 695
 696         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 697                 ppc_md.set_dawr = pseries_set_dawr;
 698
 699         pSeries_cmo_feature_init();
 700         iommu_init_early_pSeries();
 701
 702         pr_debug(" <- pSeries_init_early()\n");
 703 }
 704
 705 /**
 706  * pseries_power_off - tell firmware about how to power off the system.
 707  *
 708  * This function calls either the power-off rtas token in normal cases
 709  * or the ibm,power-off-ups token (if present & requested) in case of
 710  * a power failure. If power-off token is used, power on will only be
 711  * possible with power button press. If ibm,power-off-ups token is used
 712  * it will allow auto poweron after power is restored.
 713  */
 714 static void pseries_power_off(void)
 715 {
 716         int rc;
 717         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 718
 719         if (rtas_flash_term_hook)
 720                 rtas_flash_term_hook(SYS_POWER_OFF);
 721
 722         if (rtas_poweron_auto == 0 ||
 723                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 724                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 725                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 726         } else {
 727                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 728                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 729         }
 730         for (;;);
 731 }
 732
 733 /*
 734  * Called very early, MMU is off, device-tree isn't unflattened
 735  */
 736
 737 static int __init pseries_probe_fw_features(unsigned long node,
 738                                             const char *uname, int depth,
 739                                             void *data)
 740 {
 741         const char *prop;
 742         int len;
 743         static int hypertas_found;
 744         static int vec5_found;
 745
 746         if (depth != 1)
 747                 return 0;
 748
 749         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 750                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 751                                            &len);
 752                 if (prop) {
 753                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 754                         fw_hypertas_feature_init(prop, len);
 755                 }
 756
 757                 hypertas_found = 1;
 758         }
 759
 760         if (!strcmp(uname, "chosen")) {
 761                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 762                                            &len);
 763                 if (prop)
 764                         fw_vec5_feature_init(prop, len);
 765
 766                 vec5_found = 1;
 767         }
 768
 769         return hypertas_found && vec5_found;
 770 }
 771
 772 static int __init pSeries_probe(void)
 773 {
 774         unsigned long root = of_get_flat_dt_root();
 775         const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 776
 777         if (dtype == NULL)
 778                 return 0;
 779         if (strcmp(dtype, "chrp"))
 780                 return 0;
 781
 782         /* Cell blades firmware claims to be chrp while it's not. Until this
 783          * is fixed, we need to avoid those here.
 784          */
 785         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 786             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 787                 return 0;
 788
 789         pr_debug("pSeries detected, looking for LPAR capability...\n");
 790
 791         /* Now try to figure out if we are running on LPAR */
 792         of_scan_flat_dt(pseries_probe_fw_features, NULL);
 793
 794 #ifdef __LITTLE_ENDIAN__
 795         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 796                 long rc;
 797                 /*
 798                  * Tell the hypervisor that we want our exceptions to
 799                  * be taken in little endian mode. If this fails we don't
 800                  * want to use BUG() because it will trigger an exception.
 801                  */
 802                 rc = pseries_little_endian_exceptions();
 803                 if (rc) {
 804                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
 805                         panic("Could not enable little endian exceptions");
 806                 }
 807         }
 808 #endif
 809
 810         if (firmware_has_feature(FW_FEATURE_LPAR))
 811                 hpte_init_lpar();
 812         else
 813                 hpte_init_native();
 814
 815         pm_power_off = pseries_power_off;
 816
 817         pr_debug("Machine is%s LPAR !\n",
 818                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 819
 820         return 1;
 821 }
 822
 823 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 824 {
 825         if (firmware_has_feature(FW_FEATURE_LPAR))
 826                 return PCI_PROBE_DEVTREE;
 827         return PCI_PROBE_NORMAL;
 828 }
 829
 830 #ifndef CONFIG_PCI
 831 void pSeries_final_fixup(void) { }
 832 #endif
 833
 834 struct pci_controller_ops pseries_pci_controller_ops = {
 835         .probe_mode             = pSeries_pci_probe_mode,
 836 };
 837
 838 define_machine(pseries) {
 839         .name                   = "pSeries",
 840         .probe                  = pSeries_probe,
 841         .setup_arch             = pSeries_setup_arch,
 842         .init_early             = pSeries_init_early,
 843         .show_cpuinfo           = pSeries_show_cpuinfo,
 844         .log_error              = pSeries_log_error,
 845         .pcibios_fixup          = pSeries_final_fixup,
 846         .restart                = rtas_restart,
 847         .halt                   = rtas_halt,
 848         .panic                  = rtas_os_term,
 849         .get_boot_time          = rtas_get_boot_time,
 850         .get_rtc_time           = rtas_get_rtc_time,
 851         .set_rtc_time           = rtas_set_rtc_time,
 852         .calibrate_decr         = generic_calibrate_decr,
 853         .progress               = rtas_progress,
 854         .system_reset_exception = pSeries_system_reset_exception,
 855         .machine_check_exception = pSeries_machine_check_exception,
 856 #ifdef CONFIG_KEXEC
 857         .machine_kexec          = pSeries_machine_kexec,
 858 #endif
 859 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 860         .memory_block_size      = pseries_memory_block_size,
 861 #endif
 862 };