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(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 (!typep)
 239                         continue;
 240                 if (strstr(typep, "open-pic")) {
 241                         pSeries_mpic_node = of_node_get(np);
 242                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 243                         setup_kexec_cpu_down_mpic();
 244                         smp_init_pseries_mpic();
 245                         return;
 246                 } else if (strstr(typep, "ppc-xicp")) {
 247                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 248                         setup_kexec_cpu_down_xics();
 249                         smp_init_pseries_xics();
 250                         return;
 251                 }
 252         }
 253         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 254                " interrupt-controller\n");
 255 }
 256
 257 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
 258 {
 259         struct of_reconfig_data *rd = data;
 260         struct device_node *parent, *np = rd->dn;
 261         struct pci_dn *pdn;
 262         int err = NOTIFY_OK;
 263
 264         switch (action) {
 265         case OF_RECONFIG_ATTACH_NODE:
 266                 parent = of_get_parent(np);
 267                 pdn = parent ? PCI_DN(parent) : NULL;
 268                 if (pdn) {
 269                         /* Create pdn and EEH device */
 270                         pci_add_device_node_info(pdn->phb, np);
 271                         eeh_dev_init(PCI_DN(np), pdn->phb);
 272                 }
 273
 274                 of_node_put(parent);
 275                 break;
 276         case OF_RECONFIG_DETACH_NODE:
 277                 pdn = PCI_DN(np);
 278                 if (pdn)
 279                         list_del(&pdn->list);
 280                 break;
 281         default:
 282                 err = NOTIFY_DONE;
 283                 break;
 284         }
 285         return err;
 286 }
 287
 288 static struct notifier_block pci_dn_reconfig_nb = {
 289         .notifier_call = pci_dn_reconfig_notifier,
 290 };
 291
 292 struct kmem_cache *dtl_cache;
 293
 294 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 295 /*
 296  * Allocate space for the dispatch trace log for all possible cpus
 297  * and register the buffers with the hypervisor.  This is used for
 298  * computing time stolen by the hypervisor.
 299  */
 300 static int alloc_dispatch_logs(void)
 301 {
 302         int cpu, ret;
 303         struct paca_struct *pp;
 304         struct dtl_entry *dtl;
 305
 306         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 307                 return 0;
 308
 309         if (!dtl_cache)
 310                 return 0;
 311
 312         for_each_possible_cpu(cpu) {
 313                 pp = &paca[cpu];
 314                 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
 315                 if (!dtl) {
 316                         pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
 317                                 cpu);
 318                         pr_warn("Stolen time statistics will be unreliable\n");
 319                         break;
 320                 }
 321
 322                 pp->dtl_ridx = 0;
 323                 pp->dispatch_log = dtl;
 324                 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
 325                 pp->dtl_curr = dtl;
 326         }
 327
 328         /* Register the DTL for the current (boot) cpu */
 329         dtl = get_paca()->dispatch_log;
 330         get_paca()->dtl_ridx = 0;
 331         get_paca()->dtl_curr = dtl;
 332         get_paca()->lppaca_ptr->dtl_idx = 0;
 333
 334         /* hypervisor reads buffer length from this field */
 335         dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 336         ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 337         if (ret)
 338                 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
 339                        "with %d\n", smp_processor_id(),
 340                        hard_smp_processor_id(), ret);
 341         get_paca()->lppaca_ptr->dtl_enable_mask = 2;
 342
 343         return 0;
 344 }
 345 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 346 static inline int alloc_dispatch_logs(void)
 347 {
 348         return 0;
 349 }
 350 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 351
 352 static int alloc_dispatch_log_kmem_cache(void)
 353 {
 354         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 355                                                 DISPATCH_LOG_BYTES, 0, NULL);
 356         if (!dtl_cache) {
 357                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 358                 pr_warn("Stolen time statistics will be unreliable\n");
 359                 return 0;
 360         }
 361
 362         return alloc_dispatch_logs();
 363 }
 364 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
 365
 366 static void pseries_lpar_idle(void)
 367 {
 368         /*
 369          * Default handler to go into low thread priority and possibly
 370          * low power mode by cedeing processor to hypervisor
 371          */
 372
 373         /* Indicate to hypervisor that we are idle. */
 374         get_lppaca()->idle = 1;
 375
 376         /*
 377          * Yield the processor to the hypervisor.  We return if
 378          * an external interrupt occurs (which are driven prior
 379          * to returning here) or if a prod occurs from another
 380          * processor. When returning here, external interrupts
 381          * are enabled.
 382          */
 383         cede_processor();
 384
 385         get_lppaca()->idle = 0;
 386 }
 387
 388 /*
 389  * Enable relocation on during exceptions. This has partition wide scope and
 390  * may take a while to complete, if it takes longer than one second we will
 391  * just give up rather than wasting any more time on this - if that turns out
 392  * to ever be a problem in practice we can move this into a kernel thread to
 393  * finish off the process later in boot.
 394  */
 395 long pSeries_enable_reloc_on_exc(void)
 396 {
 397         long rc;
 398         unsigned int delay, total_delay = 0;
 399
 400         while (1) {
 401                 rc = enable_reloc_on_exceptions();
 402                 if (!H_IS_LONG_BUSY(rc))
 403                         return rc;
 404
 405                 delay = get_longbusy_msecs(rc);
 406                 total_delay += delay;
 407                 if (total_delay > 1000) {
 408                         pr_warn("Warning: Giving up waiting to enable "
 409                                 "relocation on exceptions (%u msec)!\n",
 410                                 total_delay);
 411                         return rc;
 412                 }
 413
 414                 mdelay(delay);
 415         }
 416 }
 417 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
 418
 419 long pSeries_disable_reloc_on_exc(void)
 420 {
 421         long rc;
 422
 423         while (1) {
 424                 rc = disable_reloc_on_exceptions();
 425                 if (!H_IS_LONG_BUSY(rc))
 426                         return rc;
 427                 mdelay(get_longbusy_msecs(rc));
 428         }
 429 }
 430 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
 431
 432 #ifdef CONFIG_KEXEC
 433 static void pSeries_machine_kexec(struct kimage *image)
 434 {
 435         long rc;
 436
 437         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 438                 rc = pSeries_disable_reloc_on_exc();
 439                 if (rc != H_SUCCESS)
 440                         pr_warning("Warning: Failed to disable relocation on "
 441                                    "exceptions: %ld\n", rc);
 442         }
 443
 444         default_machine_kexec(image);
 445 }
 446 #endif
 447
 448 #ifdef __LITTLE_ENDIAN__
 449 long pseries_big_endian_exceptions(void)
 450 {
 451         long rc;
 452
 453         while (1) {
 454                 rc = enable_big_endian_exceptions();
 455                 if (!H_IS_LONG_BUSY(rc))
 456                         return rc;
 457                 mdelay(get_longbusy_msecs(rc));
 458         }
 459 }
 460
 461 static long pseries_little_endian_exceptions(void)
 462 {
 463         long rc;
 464
 465         while (1) {
 466                 rc = enable_little_endian_exceptions();
 467                 if (!H_IS_LONG_BUSY(rc))
 468                         return rc;
 469                 mdelay(get_longbusy_msecs(rc));
 470         }
 471 }
 472 #endif
 473
 474 static void __init find_and_init_phbs(void)
 475 {
 476         struct device_node *node;
 477         struct pci_controller *phb;
 478         struct device_node *root = of_find_node_by_path("/");
 479
 480         for_each_child_of_node(root, node) {
 481                 if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
 482                                            strcmp(node->type, "pciex") != 0))
 483                         continue;
 484
 485                 phb = pcibios_alloc_controller(node);
 486                 if (!phb)
 487                         continue;
 488                 rtas_setup_phb(phb);
 489                 pci_process_bridge_OF_ranges(phb, node, 0);
 490                 isa_bridge_find_early(phb);
 491                 phb->controller_ops = pseries_pci_controller_ops;
 492         }
 493
 494         of_node_put(root);
 495         pci_devs_phb_init();
 496
 497         /*
 498          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
 499          * in chosen.
 500          */
 501         of_pci_check_probe_only();
 502 }
 503
 504 static void __init pSeries_setup_arch(void)
 505 {
 506         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
 507
 508         /* Discover PIC type and setup ppc_md accordingly */
 509         pseries_discover_pic();
 510
 511         /* openpic global configuration register (64-bit format). */
 512         /* openpic Interrupt Source Unit pointer (64-bit format). */
 513         /* python0 facility area (mmio) (64-bit format) REAL address. */
 514
 515         /* init to some ~sane value until calibrate_delay() runs */
 516         loops_per_jiffy = 50000000;
 517
 518         fwnmi_init();
 519
 520         /* By default, only probe PCI (can be overridden by rtas_pci) */
 521         pci_add_flags(PCI_PROBE_ONLY);
 522
 523         /* Find and initialize PCI host bridges */
 524         init_pci_config_tokens();
 525         find_and_init_phbs();
 526         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 527
 528         pSeries_nvram_init();
 529
 530         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 531                 vpa_init(boot_cpuid);
 532                 ppc_md.power_save = pseries_lpar_idle;
 533                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 534         } else {
 535                 /* No special idle routine */
 536                 ppc_md.enable_pmcs = power4_enable_pmcs;
 537         }
 538
 539         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 540
 541         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 542                 long rc;
 543
 544                 rc = pSeries_enable_reloc_on_exc();
 545                 if (rc == H_P2) {
 546                         pr_info("Relocation on exceptions not supported\n");
 547                 } else if (rc != H_SUCCESS) {
 548                         pr_warn("Unable to enable relocation on exceptions: "
 549                                 "%ld\n", rc);
 550                 }
 551         }
 552 }
 553
 554 static int __init pSeries_init_panel(void)
 555 {
 556         /* Manually leave the kernel version on the panel. */
 557 #ifdef __BIG_ENDIAN__
 558         ppc_md.progress("Linux ppc64\n", 0);
 559 #else
 560         ppc_md.progress("Linux ppc64le\n", 0);
 561 #endif
 562         ppc_md.progress(init_utsname()->version, 0);
 563
 564         return 0;
 565 }
 566 machine_arch_initcall(pseries, pSeries_init_panel);
 567
 568 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 569 {
 570         return plpar_hcall_norets(H_SET_DABR, dabr);
 571 }
 572
 573 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 574 {
 575         /* Have to set at least one bit in the DABRX according to PAPR */
 576         if (dabrx == 0 && dabr == 0)
 577                 dabrx = DABRX_USER;
 578         /* PAPR says we can only set kernel and user bits */
 579         dabrx &= DABRX_KERNEL | DABRX_USER;
 580
 581         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 582 }
 583
 584 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
 585 {
 586         /* PAPR says we can't set HYP */
 587         dawrx &= ~DAWRX_HYP;
 588
 589         return  plapr_set_watchpoint0(dawr, dawrx);
 590 }
 591
 592 #define CMO_CHARACTERISTICS_TOKEN 44
 593 #define CMO_MAXLENGTH 1026
 594
 595 void pSeries_coalesce_init(void)
 596 {
 597         struct hvcall_mpp_x_data mpp_x_data;
 598
 599         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 600                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 601         else
 602                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 603 }
 604
 605 /**
 606  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 607  * handle that here. (Stolen from parse_system_parameter_string)
 608  */
 609 static void pSeries_cmo_feature_init(void)
 610 {
 611         char *ptr, *key, *value, *end;
 612         int call_status;
 613         int page_order = IOMMU_PAGE_SHIFT_4K;
 614
 615         pr_debug(" -> fw_cmo_feature_init()\n");
 616         spin_lock(&rtas_data_buf_lock);
 617         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 618         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 619                                 NULL,
 620                                 CMO_CHARACTERISTICS_TOKEN,
 621                                 __pa(rtas_data_buf),
 622                                 RTAS_DATA_BUF_SIZE);
 623
 624         if (call_status != 0) {
 625                 spin_unlock(&rtas_data_buf_lock);
 626                 pr_debug("CMO not available\n");
 627                 pr_debug(" <- fw_cmo_feature_init()\n");
 628                 return;
 629         }
 630
 631         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 632         ptr = rtas_data_buf + 2;        /* step over strlen value */
 633         key = value = ptr;
 634
 635         while (*ptr && (ptr <= end)) {
 636                 /* Separate the key and value by replacing '=' with '\0' and
 637                  * point the value at the string after the '='
 638                  */
 639                 if (ptr[0] == '=') {
 640                         ptr[0] = '\0';
 641                         value = ptr + 1;
 642                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 643                         /* Terminate the string containing the key/value pair */
 644                         ptr[0] = '\0';
 645
 646                         if (key == value) {
 647                                 pr_debug("Malformed key/value pair\n");
 648                                 /* Never found a '=', end processing */
 649                                 break;
 650                         }
 651
 652                         if (0 == strcmp(key, "CMOPageSize"))
 653                                 page_order = simple_strtol(value, NULL, 10);
 654                         else if (0 == strcmp(key, "PrPSP"))
 655                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 656                         else if (0 == strcmp(key, "SecPSP"))
 657                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 658                         value = key = ptr + 1;
 659                 }
 660                 ptr++;
 661         }
 662
 663         /* Page size is returned as the power of 2 of the page size,
 664          * convert to the page size in bytes before returning
 665          */
 666         CMO_PageSize = 1 << page_order;
 667         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 668
 669         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 670                 pr_info("CMO enabled\n");
 671                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 672                          CMO_SecPSP);
 673                 powerpc_firmware_features |= FW_FEATURE_CMO;
 674                 pSeries_coalesce_init();
 675         } else
 676                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 677                          CMO_SecPSP);
 678         spin_unlock(&rtas_data_buf_lock);
 679         pr_debug(" <- fw_cmo_feature_init()\n");
 680 }
 681
 682 /*
 683  * Early initialization.  Relocation is on but do not reference unbolted pages
 684  */
 685 static void __init pSeries_init_early(void)
 686 {
 687         pr_debug(" -> pSeries_init_early()\n");
 688
 689 #ifdef CONFIG_HVC_CONSOLE
 690         if (firmware_has_feature(FW_FEATURE_LPAR))
 691                 hvc_vio_init_early();
 692 #endif
 693         if (firmware_has_feature(FW_FEATURE_XDABR))
 694                 ppc_md.set_dabr = pseries_set_xdabr;
 695         else if (firmware_has_feature(FW_FEATURE_DABR))
 696                 ppc_md.set_dabr = pseries_set_dabr;
 697
 698         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 699                 ppc_md.set_dawr = pseries_set_dawr;
 700
 701         pSeries_cmo_feature_init();
 702         iommu_init_early_pSeries();
 703
 704         pr_debug(" <- pSeries_init_early()\n");
 705 }
 706
 707 /**
 708  * pseries_power_off - tell firmware about how to power off the system.
 709  *
 710  * This function calls either the power-off rtas token in normal cases
 711  * or the ibm,power-off-ups token (if present & requested) in case of
 712  * a power failure. If power-off token is used, power on will only be
 713  * possible with power button press. If ibm,power-off-ups token is used
 714  * it will allow auto poweron after power is restored.
 715  */
 716 static void pseries_power_off(void)
 717 {
 718         int rc;
 719         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 720
 721         if (rtas_flash_term_hook)
 722                 rtas_flash_term_hook(SYS_POWER_OFF);
 723
 724         if (rtas_poweron_auto == 0 ||
 725                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 726                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 727                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 728         } else {
 729                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 730                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 731         }
 732         for (;;);
 733 }
 734
 735 /*
 736  * Called very early, MMU is off, device-tree isn't unflattened
 737  */
 738
 739 static int __init pseries_probe_fw_features(unsigned long node,
 740                                             const char *uname, int depth,
 741                                             void *data)
 742 {
 743         const char *prop;
 744         int len;
 745         static int hypertas_found;
 746         static int vec5_found;
 747
 748         if (depth != 1)
 749                 return 0;
 750
 751         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 752                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 753                                            &len);
 754                 if (prop) {
 755                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 756                         fw_hypertas_feature_init(prop, len);
 757                 }
 758
 759                 hypertas_found = 1;
 760         }
 761
 762         if (!strcmp(uname, "chosen")) {
 763                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 764                                            &len);
 765                 if (prop)
 766                         fw_vec5_feature_init(prop, len);
 767
 768                 vec5_found = 1;
 769         }
 770
 771         return hypertas_found && vec5_found;
 772 }
 773
 774 static int __init pSeries_probe(void)
 775 {
 776         unsigned long root = of_get_flat_dt_root();
 777         const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 778
 779         if (dtype == NULL)
 780                 return 0;
 781         if (strcmp(dtype, "chrp"))
 782                 return 0;
 783
 784         /* Cell blades firmware claims to be chrp while it's not. Until this
 785          * is fixed, we need to avoid those here.
 786          */
 787         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 788             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 789                 return 0;
 790
 791         pr_debug("pSeries detected, looking for LPAR capability...\n");
 792
 793         /* Now try to figure out if we are running on LPAR */
 794         of_scan_flat_dt(pseries_probe_fw_features, NULL);
 795
 796 #ifdef __LITTLE_ENDIAN__
 797         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
 798                 long rc;
 799                 /*
 800                  * Tell the hypervisor that we want our exceptions to
 801                  * be taken in little endian mode. If this fails we don't
 802                  * want to use BUG() because it will trigger an exception.
 803                  */
 804                 rc = pseries_little_endian_exceptions();
 805                 if (rc) {
 806                         ppc_md.progress("H_SET_MODE LE exception fail", 0);
 807                         panic("Could not enable little endian exceptions");
 808                 }
 809         }
 810 #endif
 811
 812         if (firmware_has_feature(FW_FEATURE_LPAR))
 813                 hpte_init_lpar();
 814         else
 815                 hpte_init_native();
 816
 817         pm_power_off = pseries_power_off;
 818
 819         pr_debug("Machine is%s LPAR !\n",
 820                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 821
 822         return 1;
 823 }
 824
 825 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 826 {
 827         if (firmware_has_feature(FW_FEATURE_LPAR))
 828                 return PCI_PROBE_DEVTREE;
 829         return PCI_PROBE_NORMAL;
 830 }
 831
 832 struct pci_controller_ops pseries_pci_controller_ops = {
 833         .probe_mode             = pSeries_pci_probe_mode,
 834 };
 835
 836 define_machine(pseries) {
 837         .name                   = "pSeries",
 838         .probe                  = pSeries_probe,
 839         .setup_arch             = pSeries_setup_arch,
 840         .init_early             = pSeries_init_early,
 841         .show_cpuinfo           = pSeries_show_cpuinfo,
 842         .log_error              = pSeries_log_error,
 843         .pcibios_fixup          = pSeries_final_fixup,
 844         .restart                = rtas_restart,
 845         .halt                   = rtas_halt,
 846         .panic                  = rtas_os_term,
 847         .get_boot_time          = rtas_get_boot_time,
 848         .get_rtc_time           = rtas_get_rtc_time,
 849         .set_rtc_time           = rtas_set_rtc_time,
 850         .calibrate_decr         = generic_calibrate_decr,
 851         .progress               = rtas_progress,
 852         .system_reset_exception = pSeries_system_reset_exception,
 853         .machine_check_exception = pSeries_machine_check_exception,
 854 #ifdef CONFIG_KEXEC
 855         .machine_kexec          = pSeries_machine_kexec,
 856 #endif
 857 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 858         .memory_block_size      = pseries_memory_block_size,
 859 #endif
 860 };