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 73int CMO_PrPSP = -1; 74int CMO_SecPSP = -1; 75unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K); 76EXPORT_SYMBOL(CMO_PageSize); 77 78int fwnmi_active; /* TRUE if an FWNMI handler is present */ 79 80static struct device_node *pSeries_mpic_node; 81 82static 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 */ 97static 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 115static 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 126static 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 175static 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 216static void __init pseries_xics_init_IRQ(void) 217{ 218 xics_init(); 219 pseries_setup_i8259_cascade(); 220} 221 222static 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 231static 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 255static 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 286static struct notifier_block pci_dn_reconfig_nb = { 287 .notifier_call = pci_dn_reconfig_notifier, 288}; 289 290struct 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 */ 298static 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 */ 344static inline int alloc_dispatch_logs(void) 345{ 346 return 0; 347} 348#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 349 350static 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} 362machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); 363 364static 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 */ 393long 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} 415EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 416 417long 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} 428EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 429 430#ifdef CONFIG_KEXEC 431static 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__ 447long 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 459static 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 472static 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 502static 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 552static 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} 564machine_arch_initcall(pseries, pSeries_init_panel); 565 566static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 567{ 568 return plpar_hcall_norets(H_SET_DABR, dabr); 569} 570 571static 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 582static 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 593void 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 */ 607static 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 */ 683static 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 */ 714static 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 737static 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 772static 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 823static 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 830struct pci_controller_ops pseries_pci_controller_ops = { 831 .probe_mode = pSeries_pci_probe_mode, 832}; 833 834define_machine(pseries) { 835 .name = "pSeries", 836 .probe = pSeries_probe, 837 .setup_arch = pSeries_setup_arch, 838 .init_early = pSeries_init_early, 839 .show_cpuinfo = pSeries_show_cpuinfo, 840 .log_error = pSeries_log_error, 841 .pcibios_fixup = pSeries_final_fixup, 842 .restart = rtas_restart, 843 .halt = rtas_halt, 844 .panic = rtas_os_term, 845 .get_boot_time = rtas_get_boot_time, 846 .get_rtc_time = rtas_get_rtc_time, 847 .set_rtc_time = rtas_set_rtc_time, 848 .calibrate_decr = generic_calibrate_decr, 849 .progress = rtas_progress, 850 .system_reset_exception = pSeries_system_reset_exception, 851 .machine_check_exception = pSeries_machine_check_exception, 852#ifdef CONFIG_KEXEC 853 .machine_kexec = pSeries_machine_kexec, 854#endif 855#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 856 .memory_block_size = pseries_memory_block_size, 857#endif 858}; 859