1 /* 2 * 64-bit pSeries and RS/6000 setup code. 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Adapted from 'alpha' version by Gary Thomas 6 * Modified by Cort Dougan (cort@cs.nmt.edu) 7 * Modified by PPC64 Team, IBM Corp 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * bootup setup stuff.. 17 */ 18 19 #include <linux/cpu.h> 20 #include <linux/errno.h> 21 #include <linux/sched.h> 22 #include <linux/kernel.h> 23 #include <linux/mm.h> 24 #include <linux/stddef.h> 25 #include <linux/unistd.h> 26 #include <linux/user.h> 27 #include <linux/tty.h> 28 #include <linux/major.h> 29 #include <linux/interrupt.h> 30 #include <linux/reboot.h> 31 #include <linux/init.h> 32 #include <linux/ioport.h> 33 #include <linux/console.h> 34 #include <linux/pci.h> 35 #include <linux/utsname.h> 36 #include <linux/adb.h> 37 #include <linux/export.h> 38 #include <linux/delay.h> 39 #include <linux/irq.h> 40 #include <linux/seq_file.h> 41 #include <linux/root_dev.h> 42 #include <linux/cpuidle.h> 43 #include <linux/of.h> 44 #include <linux/kexec.h> 45 46 #include <asm/mmu.h> 47 #include <asm/processor.h> 48 #include <asm/io.h> 49 #include <asm/pgtable.h> 50 #include <asm/prom.h> 51 #include <asm/rtas.h> 52 #include <asm/pci-bridge.h> 53 #include <asm/iommu.h> 54 #include <asm/dma.h> 55 #include <asm/machdep.h> 56 #include <asm/irq.h> 57 #include <asm/time.h> 58 #include <asm/nvram.h> 59 #include <asm/pmc.h> 60 #include <asm/mpic.h> 61 #include <asm/xics.h> 62 #include <asm/ppc-pci.h> 63 #include <asm/i8259.h> 64 #include <asm/udbg.h> 65 #include <asm/smp.h> 66 #include <asm/firmware.h> 67 #include <asm/eeh.h> 68 #include <asm/reg.h> 69 #include <asm/plpar_wrappers.h> 70 71 #include "pseries.h" 72 73 int CMO_PrPSP = -1; 74 int CMO_SecPSP = -1; 75 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); 76 EXPORT_SYMBOL(CMO_PageSize); 77 78 int fwnmi_active; /* TRUE if an FWNMI handler is present */ 79 80 static struct device_node *pSeries_mpic_node; 81 82 static void pSeries_show_cpuinfo(struct seq_file *m) 83 { 84 struct device_node *root; 85 const char *model = ""; 86 87 root = of_find_node_by_path("/"); 88 if (root) 89 model = of_get_property(root, "model", NULL); 90 seq_printf(m, "machine\t\t: CHRP %s\n", model); 91 of_node_put(root); 92 } 93 94 /* Initialize firmware assisted non-maskable interrupts if 95 * the firmware supports this feature. 96 */ 97 static void __init fwnmi_init(void) 98 { 99 unsigned long system_reset_addr, machine_check_addr; 100 101 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 102 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 103 return; 104 105 /* If the kernel's not linked at zero we point the firmware at low 106 * addresses anyway, and use a trampoline to get to the real code. */ 107 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 108 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 109 110 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 111 machine_check_addr)) 112 fwnmi_active = 1; 113 } 114 115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 116 { 117 struct irq_chip *chip = irq_desc_get_chip(desc); 118 unsigned int cascade_irq = i8259_irq(); 119 120 if (cascade_irq != NO_IRQ) 121 generic_handle_irq(cascade_irq); 122 123 chip->irq_eoi(&desc->irq_data); 124 } 125 126 static void __init pseries_setup_i8259_cascade(void) 127 { 128 struct device_node *np, *old, *found = NULL; 129 unsigned int cascade; 130 const u32 *addrp; 131 unsigned long intack = 0; 132 int naddr; 133 134 for_each_node_by_type(np, "interrupt-controller") { 135 if (of_device_is_compatible(np, "chrp,iic")) { 136 found = np; 137 break; 138 } 139 } 140 141 if (found == NULL) { 142 printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); 143 return; 144 } 145 146 cascade = irq_of_parse_and_map(found, 0); 147 if (cascade == NO_IRQ) { 148 printk(KERN_ERR "pic: failed to map cascade interrupt"); 149 return; 150 } 151 pr_debug("pic: cascade mapped to irq %d\n", cascade); 152 153 for (old = of_node_get(found); old != NULL ; old = np) { 154 np = of_get_parent(old); 155 of_node_put(old); 156 if (np == NULL) 157 break; 158 if (strcmp(np->name, "pci") != 0) 159 continue; 160 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); 161 if (addrp == NULL) 162 continue; 163 naddr = of_n_addr_cells(np); 164 intack = addrp[naddr-1]; 165 if (naddr > 1) 166 intack |= ((unsigned long)addrp[naddr-2]) << 32; 167 } 168 if (intack) 169 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); 170 i8259_init(found, intack); 171 of_node_put(found); 172 irq_set_chained_handler(cascade, pseries_8259_cascade); 173 } 174 175 static void __init pseries_mpic_init_IRQ(void) 176 { 177 struct device_node *np; 178 const unsigned int *opprop; 179 unsigned long openpic_addr = 0; 180 int naddr, n, i, opplen; 181 struct mpic *mpic; 182 183 np = of_find_node_by_path("/"); 184 naddr = of_n_addr_cells(np); 185 opprop = of_get_property(np, "platform-open-pic", &opplen); 186 if (opprop != NULL) { 187 openpic_addr = of_read_number(opprop, naddr); 188 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); 189 } 190 of_node_put(np); 191 192 BUG_ON(openpic_addr == 0); 193 194 /* Setup the openpic driver */ 195 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, 196 MPIC_NO_RESET, 16, 0, " MPIC "); 197 BUG_ON(mpic == NULL); 198 199 /* Add ISUs */ 200 opplen /= sizeof(u32); 201 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 202 unsigned long isuaddr = of_read_number(opprop + i, naddr); 203 mpic_assign_isu(mpic, n, isuaddr); 204 } 205 206 /* Setup top-level get_irq */ 207 ppc_md.get_irq = mpic_get_irq; 208 209 /* All ISUs are setup, complete initialization */ 210 mpic_init(mpic); 211 212 /* Look for cascade */ 213 pseries_setup_i8259_cascade(); 214 } 215 216 static void __init pseries_xics_init_IRQ(void) 217 { 218 xics_init(); 219 pseries_setup_i8259_cascade(); 220 } 221 222 static void pseries_lpar_enable_pmcs(void) 223 { 224 unsigned long set, reset; 225 226 set = 1UL << 63; 227 reset = 0; 228 plpar_hcall_norets(H_PERFMON, set, reset); 229 } 230 231 static void __init pseries_discover_pic(void) 232 { 233 struct device_node *np; 234 const char *typep; 235 236 for (np = NULL; (np = of_find_node_by_name(np, 237 "interrupt-controller"));) { 238 typep = of_get_property(np, "compatible", NULL); 239 if (strstr(typep, "open-pic")) { 240 pSeries_mpic_node = of_node_get(np); 241 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 242 setup_kexec_cpu_down_mpic(); 243 smp_init_pseries_mpic(); 244 return; 245 } else if (strstr(typep, "ppc-xicp")) { 246 ppc_md.init_IRQ = pseries_xics_init_IRQ; 247 setup_kexec_cpu_down_xics(); 248 smp_init_pseries_xics(); 249 return; 250 } 251 } 252 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 253 " interrupt-controller\n"); 254 } 255 256 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) 257 { 258 struct device_node *np = node; 259 struct pci_dn *pci = NULL; 260 int err = NOTIFY_OK; 261 262 switch (action) { 263 case OF_RECONFIG_ATTACH_NODE: 264 pci = np->parent->data; 265 if (pci) { 266 update_dn_pci_info(np, pci->phb); 267 268 /* Create EEH device for the OF node */ 269 eeh_dev_init(np, pci->phb); 270 } 271 break; 272 default: 273 err = NOTIFY_DONE; 274 break; 275 } 276 return err; 277 } 278 279 static struct notifier_block pci_dn_reconfig_nb = { 280 .notifier_call = pci_dn_reconfig_notifier, 281 }; 282 283 struct kmem_cache *dtl_cache; 284 285 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 286 /* 287 * Allocate space for the dispatch trace log for all possible cpus 288 * and register the buffers with the hypervisor. This is used for 289 * computing time stolen by the hypervisor. 290 */ 291 static int alloc_dispatch_logs(void) 292 { 293 int cpu, ret; 294 struct paca_struct *pp; 295 struct dtl_entry *dtl; 296 297 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 298 return 0; 299 300 if (!dtl_cache) 301 return 0; 302 303 for_each_possible_cpu(cpu) { 304 pp = &paca[cpu]; 305 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 306 if (!dtl) { 307 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 308 cpu); 309 pr_warn("Stolen time statistics will be unreliable\n"); 310 break; 311 } 312 313 pp->dtl_ridx = 0; 314 pp->dispatch_log = dtl; 315 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 316 pp->dtl_curr = dtl; 317 } 318 319 /* Register the DTL for the current (boot) cpu */ 320 dtl = get_paca()->dispatch_log; 321 get_paca()->dtl_ridx = 0; 322 get_paca()->dtl_curr = dtl; 323 get_paca()->lppaca_ptr->dtl_idx = 0; 324 325 /* hypervisor reads buffer length from this field */ 326 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 327 ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); 328 if (ret) 329 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " 330 "with %d\n", smp_processor_id(), 331 hard_smp_processor_id(), ret); 332 get_paca()->lppaca_ptr->dtl_enable_mask = 2; 333 334 return 0; 335 } 336 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 337 static inline int alloc_dispatch_logs(void) 338 { 339 return 0; 340 } 341 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 342 343 static int alloc_dispatch_log_kmem_cache(void) 344 { 345 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, 346 DISPATCH_LOG_BYTES, 0, NULL); 347 if (!dtl_cache) { 348 pr_warn("Failed to create dispatch trace log buffer cache\n"); 349 pr_warn("Stolen time statistics will be unreliable\n"); 350 return 0; 351 } 352 353 return alloc_dispatch_logs(); 354 } 355 early_initcall(alloc_dispatch_log_kmem_cache); 356 357 static void pseries_lpar_idle(void) 358 { 359 /* This would call on the cpuidle framework, and the back-end pseries 360 * driver to go to idle states 361 */ 362 if (cpuidle_idle_call()) { 363 /* On error, execute default handler 364 * to go into low thread priority and possibly 365 * low power mode by cedeing processor to hypervisor 366 */ 367 368 /* Indicate to hypervisor that we are idle. */ 369 get_lppaca()->idle = 1; 370 371 /* 372 * Yield the processor to the hypervisor. We return if 373 * an external interrupt occurs (which are driven prior 374 * to returning here) or if a prod occurs from another 375 * processor. When returning here, external interrupts 376 * are enabled. 377 */ 378 cede_processor(); 379 380 get_lppaca()->idle = 0; 381 } 382 } 383 384 /* 385 * Enable relocation on during exceptions. This has partition wide scope and 386 * may take a while to complete, if it takes longer than one second we will 387 * just give up rather than wasting any more time on this - if that turns out 388 * to ever be a problem in practice we can move this into a kernel thread to 389 * finish off the process later in boot. 390 */ 391 long pSeries_enable_reloc_on_exc(void) 392 { 393 long rc; 394 unsigned int delay, total_delay = 0; 395 396 while (1) { 397 rc = enable_reloc_on_exceptions(); 398 if (!H_IS_LONG_BUSY(rc)) 399 return rc; 400 401 delay = get_longbusy_msecs(rc); 402 total_delay += delay; 403 if (total_delay > 1000) { 404 pr_warn("Warning: Giving up waiting to enable " 405 "relocation on exceptions (%u msec)!\n", 406 total_delay); 407 return rc; 408 } 409 410 mdelay(delay); 411 } 412 } 413 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 414 415 long pSeries_disable_reloc_on_exc(void) 416 { 417 long rc; 418 419 while (1) { 420 rc = disable_reloc_on_exceptions(); 421 if (!H_IS_LONG_BUSY(rc)) 422 return rc; 423 mdelay(get_longbusy_msecs(rc)); 424 } 425 } 426 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 427 428 #ifdef CONFIG_KEXEC 429 static void pSeries_machine_kexec(struct kimage *image) 430 { 431 long rc; 432 433 if (firmware_has_feature(FW_FEATURE_SET_MODE) && 434 (image->type != KEXEC_TYPE_CRASH)) { 435 rc = pSeries_disable_reloc_on_exc(); 436 if (rc != H_SUCCESS) 437 pr_warning("Warning: Failed to disable relocation on " 438 "exceptions: %ld\n", rc); 439 } 440 441 default_machine_kexec(image); 442 } 443 #endif 444 445 #ifdef __LITTLE_ENDIAN__ 446 long pseries_big_endian_exceptions(void) 447 { 448 long rc; 449 450 while (1) { 451 rc = enable_big_endian_exceptions(); 452 if (!H_IS_LONG_BUSY(rc)) 453 return rc; 454 mdelay(get_longbusy_msecs(rc)); 455 } 456 } 457 458 static long pseries_little_endian_exceptions(void) 459 { 460 long rc; 461 462 while (1) { 463 rc = enable_little_endian_exceptions(); 464 if (!H_IS_LONG_BUSY(rc)) 465 return rc; 466 mdelay(get_longbusy_msecs(rc)); 467 } 468 } 469 #endif 470 471 static void __init pSeries_setup_arch(void) 472 { 473 panic_timeout = 10; 474 475 /* Discover PIC type and setup ppc_md accordingly */ 476 pseries_discover_pic(); 477 478 /* openpic global configuration register (64-bit format). */ 479 /* openpic Interrupt Source Unit pointer (64-bit format). */ 480 /* python0 facility area (mmio) (64-bit format) REAL address. */ 481 482 /* init to some ~sane value until calibrate_delay() runs */ 483 loops_per_jiffy = 50000000; 484 485 fwnmi_init(); 486 487 /* By default, only probe PCI (can be overriden by rtas_pci) */ 488 pci_add_flags(PCI_PROBE_ONLY); 489 490 /* Find and initialize PCI host bridges */ 491 init_pci_config_tokens(); 492 find_and_init_phbs(); 493 of_reconfig_notifier_register(&pci_dn_reconfig_nb); 494 495 pSeries_nvram_init(); 496 497 if (firmware_has_feature(FW_FEATURE_LPAR)) { 498 vpa_init(boot_cpuid); 499 ppc_md.power_save = pseries_lpar_idle; 500 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 501 } else { 502 /* No special idle routine */ 503 ppc_md.enable_pmcs = power4_enable_pmcs; 504 } 505 506 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; 507 508 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 509 long rc; 510 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) { 511 pr_warn("Unable to enable relocation on exceptions: " 512 "%ld\n", rc); 513 } 514 } 515 } 516 517 static int __init pSeries_init_panel(void) 518 { 519 /* Manually leave the kernel version on the panel. */ 520 ppc_md.progress("Linux ppc64\n", 0); 521 ppc_md.progress(init_utsname()->version, 0); 522 523 return 0; 524 } 525 machine_arch_initcall(pseries, pSeries_init_panel); 526 527 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 528 { 529 return plpar_hcall_norets(H_SET_DABR, dabr); 530 } 531 532 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) 533 { 534 /* Have to set at least one bit in the DABRX according to PAPR */ 535 if (dabrx == 0 && dabr == 0) 536 dabrx = DABRX_USER; 537 /* PAPR says we can only set kernel and user bits */ 538 dabrx &= DABRX_KERNEL | DABRX_USER; 539 540 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); 541 } 542 543 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) 544 { 545 /* PAPR says we can't set HYP */ 546 dawrx &= ~DAWRX_HYP; 547 548 return plapr_set_watchpoint0(dawr, dawrx); 549 } 550 551 #define CMO_CHARACTERISTICS_TOKEN 44 552 #define CMO_MAXLENGTH 1026 553 554 void pSeries_coalesce_init(void) 555 { 556 struct hvcall_mpp_x_data mpp_x_data; 557 558 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 559 powerpc_firmware_features |= FW_FEATURE_XCMO; 560 else 561 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 562 } 563 564 /** 565 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 566 * handle that here. (Stolen from parse_system_parameter_string) 567 */ 568 void pSeries_cmo_feature_init(void) 569 { 570 char *ptr, *key, *value, *end; 571 int call_status; 572 int page_order = IOMMU_PAGE_SHIFT; 573 574 pr_debug(" -> fw_cmo_feature_init()\n"); 575 spin_lock(&rtas_data_buf_lock); 576 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 577 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 578 NULL, 579 CMO_CHARACTERISTICS_TOKEN, 580 __pa(rtas_data_buf), 581 RTAS_DATA_BUF_SIZE); 582 583 if (call_status != 0) { 584 spin_unlock(&rtas_data_buf_lock); 585 pr_debug("CMO not available\n"); 586 pr_debug(" <- fw_cmo_feature_init()\n"); 587 return; 588 } 589 590 end = rtas_data_buf + CMO_MAXLENGTH - 2; 591 ptr = rtas_data_buf + 2; /* step over strlen value */ 592 key = value = ptr; 593 594 while (*ptr && (ptr <= end)) { 595 /* Separate the key and value by replacing '=' with '\0' and 596 * point the value at the string after the '=' 597 */ 598 if (ptr[0] == '=') { 599 ptr[0] = '\0'; 600 value = ptr + 1; 601 } else if (ptr[0] == '\0' || ptr[0] == ',') { 602 /* Terminate the string containing the key/value pair */ 603 ptr[0] = '\0'; 604 605 if (key == value) { 606 pr_debug("Malformed key/value pair\n"); 607 /* Never found a '=', end processing */ 608 break; 609 } 610 611 if (0 == strcmp(key, "CMOPageSize")) 612 page_order = simple_strtol(value, NULL, 10); 613 else if (0 == strcmp(key, "PrPSP")) 614 CMO_PrPSP = simple_strtol(value, NULL, 10); 615 else if (0 == strcmp(key, "SecPSP")) 616 CMO_SecPSP = simple_strtol(value, NULL, 10); 617 value = key = ptr + 1; 618 } 619 ptr++; 620 } 621 622 /* Page size is returned as the power of 2 of the page size, 623 * convert to the page size in bytes before returning 624 */ 625 CMO_PageSize = 1 << page_order; 626 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 627 628 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 629 pr_info("CMO enabled\n"); 630 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 631 CMO_SecPSP); 632 powerpc_firmware_features |= FW_FEATURE_CMO; 633 pSeries_coalesce_init(); 634 } else 635 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 636 CMO_SecPSP); 637 spin_unlock(&rtas_data_buf_lock); 638 pr_debug(" <- fw_cmo_feature_init()\n"); 639 } 640 641 /* 642 * Early initialization. Relocation is on but do not reference unbolted pages 643 */ 644 static void __init pSeries_init_early(void) 645 { 646 pr_debug(" -> pSeries_init_early()\n"); 647 648 #ifdef CONFIG_HVC_CONSOLE 649 if (firmware_has_feature(FW_FEATURE_LPAR)) 650 hvc_vio_init_early(); 651 #endif 652 if (firmware_has_feature(FW_FEATURE_XDABR)) 653 ppc_md.set_dabr = pseries_set_xdabr; 654 else if (firmware_has_feature(FW_FEATURE_DABR)) 655 ppc_md.set_dabr = pseries_set_dabr; 656 657 if (firmware_has_feature(FW_FEATURE_SET_MODE)) 658 ppc_md.set_dawr = pseries_set_dawr; 659 660 pSeries_cmo_feature_init(); 661 iommu_init_early_pSeries(); 662 663 pr_debug(" <- pSeries_init_early()\n"); 664 } 665 666 /* 667 * Called very early, MMU is off, device-tree isn't unflattened 668 */ 669 670 static int __init pseries_probe_fw_features(unsigned long node, 671 const char *uname, int depth, 672 void *data) 673 { 674 const char *prop; 675 unsigned long len; 676 static int hypertas_found; 677 static int vec5_found; 678 679 if (depth != 1) 680 return 0; 681 682 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 683 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 684 &len); 685 if (prop) { 686 powerpc_firmware_features |= FW_FEATURE_LPAR; 687 fw_hypertas_feature_init(prop, len); 688 } 689 690 hypertas_found = 1; 691 } 692 693 if (!strcmp(uname, "chosen")) { 694 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 695 &len); 696 if (prop) 697 fw_vec5_feature_init(prop, len); 698 699 vec5_found = 1; 700 } 701 702 return hypertas_found && vec5_found; 703 } 704 705 static int __init pSeries_probe(void) 706 { 707 unsigned long root = of_get_flat_dt_root(); 708 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 709 710 if (dtype == NULL) 711 return 0; 712 if (strcmp(dtype, "chrp")) 713 return 0; 714 715 /* Cell blades firmware claims to be chrp while it's not. Until this 716 * is fixed, we need to avoid those here. 717 */ 718 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 719 of_flat_dt_is_compatible(root, "IBM,CBEA")) 720 return 0; 721 722 pr_debug("pSeries detected, looking for LPAR capability...\n"); 723 724 /* Now try to figure out if we are running on LPAR */ 725 of_scan_flat_dt(pseries_probe_fw_features, NULL); 726 727 #ifdef __LITTLE_ENDIAN__ 728 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 729 long rc; 730 /* 731 * Tell the hypervisor that we want our exceptions to 732 * be taken in little endian mode. If this fails we don't 733 * want to use BUG() because it will trigger an exception. 734 */ 735 rc = pseries_little_endian_exceptions(); 736 if (rc) { 737 ppc_md.progress("H_SET_MODE LE exception fail", 0); 738 panic("Could not enable little endian exceptions"); 739 } 740 } 741 #endif 742 743 if (firmware_has_feature(FW_FEATURE_LPAR)) 744 hpte_init_lpar(); 745 else 746 hpte_init_native(); 747 748 pr_debug("Machine is%s LPAR !\n", 749 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 750 751 return 1; 752 } 753 754 static int pSeries_pci_probe_mode(struct pci_bus *bus) 755 { 756 if (firmware_has_feature(FW_FEATURE_LPAR)) 757 return PCI_PROBE_DEVTREE; 758 return PCI_PROBE_NORMAL; 759 } 760 761 /** 762 * pSeries_power_off - tell firmware about how to power off the system. 763 * 764 * This function calls either the power-off rtas token in normal cases 765 * or the ibm,power-off-ups token (if present & requested) in case of 766 * a power failure. If power-off token is used, power on will only be 767 * possible with power button press. If ibm,power-off-ups token is used 768 * it will allow auto poweron after power is restored. 769 */ 770 static void pSeries_power_off(void) 771 { 772 int rc; 773 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 774 775 if (rtas_flash_term_hook) 776 rtas_flash_term_hook(SYS_POWER_OFF); 777 778 if (rtas_poweron_auto == 0 || 779 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 780 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 781 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 782 } else { 783 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 784 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 785 } 786 for (;;); 787 } 788 789 #ifndef CONFIG_PCI 790 void pSeries_final_fixup(void) { } 791 #endif 792 793 define_machine(pseries) { 794 .name = "pSeries", 795 .probe = pSeries_probe, 796 .setup_arch = pSeries_setup_arch, 797 .init_early = pSeries_init_early, 798 .show_cpuinfo = pSeries_show_cpuinfo, 799 .log_error = pSeries_log_error, 800 .pcibios_fixup = pSeries_final_fixup, 801 .pci_probe_mode = pSeries_pci_probe_mode, 802 .restart = rtas_restart, 803 .power_off = pSeries_power_off, 804 .halt = rtas_halt, 805 .panic = rtas_os_term, 806 .get_boot_time = rtas_get_boot_time, 807 .get_rtc_time = rtas_get_rtc_time, 808 .set_rtc_time = rtas_set_rtc_time, 809 .calibrate_decr = generic_calibrate_decr, 810 .progress = rtas_progress, 811 .system_reset_exception = pSeries_system_reset_exception, 812 .machine_check_exception = pSeries_machine_check_exception, 813 #ifdef CONFIG_KEXEC 814 .machine_kexec = pSeries_machine_kexec, 815 #endif 816 }; 817