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/kexec.h> 44 45#include <asm/mmu.h> 46#include <asm/processor.h> 47#include <asm/io.h> 48#include <asm/pgtable.h> 49#include <asm/prom.h> 50#include <asm/rtas.h> 51#include <asm/pci-bridge.h> 52#include <asm/iommu.h> 53#include <asm/dma.h> 54#include <asm/machdep.h> 55#include <asm/irq.h> 56#include <asm/time.h> 57#include <asm/nvram.h> 58#include <asm/pmc.h> 59#include <asm/mpic.h> 60#include <asm/xics.h> 61#include <asm/ppc-pci.h> 62#include <asm/i8259.h> 63#include <asm/udbg.h> 64#include <asm/smp.h> 65#include <asm/firmware.h> 66#include <asm/eeh.h> 67#include <asm/reg.h> 68#include <asm/plpar_wrappers.h> 69 70#include "pseries.h" 71 72int CMO_PrPSP = -1; 73int CMO_SecPSP = -1; 74unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K); 75EXPORT_SYMBOL(CMO_PageSize); 76 77int fwnmi_active; /* TRUE if an FWNMI handler is present */ 78 79static struct device_node *pSeries_mpic_node; 80 81static void pSeries_show_cpuinfo(struct seq_file *m) 82{ 83 struct device_node *root; 84 const char *model = ""; 85 86 root = of_find_node_by_path("/"); 87 if (root) 88 model = of_get_property(root, "model", NULL); 89 seq_printf(m, "machine\t\t: CHRP %s\n", model); 90 of_node_put(root); 91} 92 93/* Initialize firmware assisted non-maskable interrupts if 94 * the firmware supports this feature. 95 */ 96static void __init fwnmi_init(void) 97{ 98 unsigned long system_reset_addr, machine_check_addr; 99 100 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 101 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 102 return; 103 104 /* If the kernel's not linked at zero we point the firmware at low 105 * addresses anyway, and use a trampoline to get to the real code. */ 106 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 107 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 108 109 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 110 machine_check_addr)) 111 fwnmi_active = 1; 112} 113 114static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 115{ 116 struct irq_chip *chip = irq_desc_get_chip(desc); 117 unsigned int cascade_irq = i8259_irq(); 118 119 if (cascade_irq != NO_IRQ) 120 generic_handle_irq(cascade_irq); 121 122 chip->irq_eoi(&desc->irq_data); 123} 124 125static void __init pseries_setup_i8259_cascade(void) 126{ 127 struct device_node *np, *old, *found = NULL; 128 unsigned int cascade; 129 const u32 *addrp; 130 unsigned long intack = 0; 131 int naddr; 132 133 for_each_node_by_type(np, "interrupt-controller") { 134 if (of_device_is_compatible(np, "chrp,iic")) { 135 found = np; 136 break; 137 } 138 } 139 140 if (found == NULL) { 141 printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); 142 return; 143 } 144 145 cascade = irq_of_parse_and_map(found, 0); 146 if (cascade == NO_IRQ) { 147 printk(KERN_ERR "pic: failed to map cascade interrupt"); 148 return; 149 } 150 pr_debug("pic: cascade mapped to irq %d\n", cascade); 151 152 for (old = of_node_get(found); old != NULL ; old = np) { 153 np = of_get_parent(old); 154 of_node_put(old); 155 if (np == NULL) 156 break; 157 if (strcmp(np->name, "pci") != 0) 158 continue; 159 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); 160 if (addrp == NULL) 161 continue; 162 naddr = of_n_addr_cells(np); 163 intack = addrp[naddr-1]; 164 if (naddr > 1) 165 intack |= ((unsigned long)addrp[naddr-2]) << 32; 166 } 167 if (intack) 168 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); 169 i8259_init(found, intack); 170 of_node_put(found); 171 irq_set_chained_handler(cascade, pseries_8259_cascade); 172} 173 174static void __init pseries_mpic_init_IRQ(void) 175{ 176 struct device_node *np; 177 const unsigned int *opprop; 178 unsigned long openpic_addr = 0; 179 int naddr, n, i, opplen; 180 struct mpic *mpic; 181 182 np = of_find_node_by_path("/"); 183 naddr = of_n_addr_cells(np); 184 opprop = of_get_property(np, "platform-open-pic", &opplen); 185 if (opprop != NULL) { 186 openpic_addr = of_read_number(opprop, naddr); 187 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); 188 } 189 of_node_put(np); 190 191 BUG_ON(openpic_addr == 0); 192 193 /* Setup the openpic driver */ 194 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, 195 MPIC_NO_RESET, 16, 0, " MPIC "); 196 BUG_ON(mpic == NULL); 197 198 /* Add ISUs */ 199 opplen /= sizeof(u32); 200 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 201 unsigned long isuaddr = of_read_number(opprop + i, naddr); 202 mpic_assign_isu(mpic, n, isuaddr); 203 } 204 205 /* Setup top-level get_irq */ 206 ppc_md.get_irq = mpic_get_irq; 207 208 /* All ISUs are setup, complete initialization */ 209 mpic_init(mpic); 210 211 /* Look for cascade */ 212 pseries_setup_i8259_cascade(); 213} 214 215static void __init pseries_xics_init_IRQ(void) 216{ 217 xics_init(); 218 pseries_setup_i8259_cascade(); 219} 220 221static void pseries_lpar_enable_pmcs(void) 222{ 223 unsigned long set, reset; 224 225 set = 1UL << 63; 226 reset = 0; 227 plpar_hcall_norets(H_PERFMON, set, reset); 228} 229 230static void __init pseries_discover_pic(void) 231{ 232 struct device_node *np; 233 const char *typep; 234 235 for_each_node_by_name(np, "interrupt-controller") { 236 typep = of_get_property(np, "compatible", NULL); 237 if (strstr(typep, "open-pic")) { 238 pSeries_mpic_node = of_node_get(np); 239 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 240 setup_kexec_cpu_down_mpic(); 241 smp_init_pseries_mpic(); 242 return; 243 } else if (strstr(typep, "ppc-xicp")) { 244 ppc_md.init_IRQ = pseries_xics_init_IRQ; 245 setup_kexec_cpu_down_xics(); 246 smp_init_pseries_xics(); 247 return; 248 } 249 } 250 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 251 " interrupt-controller\n"); 252} 253 254static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data) 255{ 256 struct of_reconfig_data *rd = data; 257 struct device_node *np = rd->dn; 258 struct pci_dn *pci = NULL; 259 int err = NOTIFY_OK; 260 261 switch (action) { 262 case OF_RECONFIG_ATTACH_NODE: 263 pci = np->parent->data; 264 if (pci) { 265 update_dn_pci_info(np, pci->phb); 266 267 /* Create EEH device for the OF node */ 268 eeh_dev_init(PCI_DN(np), pci->phb); 269 } 270 break; 271 case OF_RECONFIG_DETACH_NODE: 272 pci = PCI_DN(np); 273 if (pci) 274 list_del(&pci->list); 275 break; 276 default: 277 err = NOTIFY_DONE; 278 break; 279 } 280 return err; 281} 282 283static struct notifier_block pci_dn_reconfig_nb = { 284 .notifier_call = pci_dn_reconfig_notifier, 285}; 286 287struct kmem_cache *dtl_cache; 288 289#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 290/* 291 * Allocate space for the dispatch trace log for all possible cpus 292 * and register the buffers with the hypervisor. This is used for 293 * computing time stolen by the hypervisor. 294 */ 295static int alloc_dispatch_logs(void) 296{ 297 int cpu, ret; 298 struct paca_struct *pp; 299 struct dtl_entry *dtl; 300 301 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 302 return 0; 303 304 if (!dtl_cache) 305 return 0; 306 307 for_each_possible_cpu(cpu) { 308 pp = &paca[cpu]; 309 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 310 if (!dtl) { 311 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 312 cpu); 313 pr_warn("Stolen time statistics will be unreliable\n"); 314 break; 315 } 316 317 pp->dtl_ridx = 0; 318 pp->dispatch_log = dtl; 319 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 320 pp->dtl_curr = dtl; 321 } 322 323 /* Register the DTL for the current (boot) cpu */ 324 dtl = get_paca()->dispatch_log; 325 get_paca()->dtl_ridx = 0; 326 get_paca()->dtl_curr = dtl; 327 get_paca()->lppaca_ptr->dtl_idx = 0; 328 329 /* hypervisor reads buffer length from this field */ 330 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 331 ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); 332 if (ret) 333 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " 334 "with %d\n", smp_processor_id(), 335 hard_smp_processor_id(), ret); 336 get_paca()->lppaca_ptr->dtl_enable_mask = 2; 337 338 return 0; 339} 340#else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 341static inline int alloc_dispatch_logs(void) 342{ 343 return 0; 344} 345#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 346 347static int alloc_dispatch_log_kmem_cache(void) 348{ 349 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, 350 DISPATCH_LOG_BYTES, 0, NULL); 351 if (!dtl_cache) { 352 pr_warn("Failed to create dispatch trace log buffer cache\n"); 353 pr_warn("Stolen time statistics will be unreliable\n"); 354 return 0; 355 } 356 357 return alloc_dispatch_logs(); 358} 359machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); 360 361static void pseries_lpar_idle(void) 362{ 363 /* 364 * Default handler 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 * Enable relocation on during exceptions. This has partition wide scope and 385 * may take a while to complete, if it takes longer than one second we will 386 * just give up rather than wasting any more time on this - if that turns out 387 * to ever be a problem in practice we can move this into a kernel thread to 388 * finish off the process later in boot. 389 */ 390long pSeries_enable_reloc_on_exc(void) 391{ 392 long rc; 393 unsigned int delay, total_delay = 0; 394 395 while (1) { 396 rc = enable_reloc_on_exceptions(); 397 if (!H_IS_LONG_BUSY(rc)) 398 return rc; 399 400 delay = get_longbusy_msecs(rc); 401 total_delay += delay; 402 if (total_delay > 1000) { 403 pr_warn("Warning: Giving up waiting to enable " 404 "relocation on exceptions (%u msec)!\n", 405 total_delay); 406 return rc; 407 } 408 409 mdelay(delay); 410 } 411} 412EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 413 414long pSeries_disable_reloc_on_exc(void) 415{ 416 long rc; 417 418 while (1) { 419 rc = disable_reloc_on_exceptions(); 420 if (!H_IS_LONG_BUSY(rc)) 421 return rc; 422 mdelay(get_longbusy_msecs(rc)); 423 } 424} 425EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 426 427#ifdef CONFIG_KEXEC 428static void pSeries_machine_kexec(struct kimage *image) 429{ 430 long rc; 431 432 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 433 rc = pSeries_disable_reloc_on_exc(); 434 if (rc != H_SUCCESS) 435 pr_warning("Warning: Failed to disable relocation on " 436 "exceptions: %ld\n", rc); 437 } 438 439 default_machine_kexec(image); 440} 441#endif 442 443#ifdef __LITTLE_ENDIAN__ 444long pseries_big_endian_exceptions(void) 445{ 446 long rc; 447 448 while (1) { 449 rc = enable_big_endian_exceptions(); 450 if (!H_IS_LONG_BUSY(rc)) 451 return rc; 452 mdelay(get_longbusy_msecs(rc)); 453 } 454} 455 456static long pseries_little_endian_exceptions(void) 457{ 458 long rc; 459 460 while (1) { 461 rc = enable_little_endian_exceptions(); 462 if (!H_IS_LONG_BUSY(rc)) 463 return rc; 464 mdelay(get_longbusy_msecs(rc)); 465 } 466} 467#endif 468 469static void __init find_and_init_phbs(void) 470{ 471 struct device_node *node; 472 struct pci_controller *phb; 473 struct device_node *root = of_find_node_by_path("/"); 474 475 for_each_child_of_node(root, node) { 476 if (node->type == NULL || (strcmp(node->type, "pci") != 0 && 477 strcmp(node->type, "pciex") != 0)) 478 continue; 479 480 phb = pcibios_alloc_controller(node); 481 if (!phb) 482 continue; 483 rtas_setup_phb(phb); 484 pci_process_bridge_OF_ranges(phb, node, 0); 485 isa_bridge_find_early(phb); 486 phb->controller_ops = pseries_pci_controller_ops; 487 } 488 489 of_node_put(root); 490 pci_devs_phb_init(); 491 492 /* 493 * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties 494 * in chosen. 495 */ 496 if (of_chosen) { 497 const int *prop; 498 499 prop = of_get_property(of_chosen, 500 "linux,pci-probe-only", NULL); 501 if (prop) { 502 if (*prop) 503 pci_add_flags(PCI_PROBE_ONLY); 504 else 505 pci_clear_flags(PCI_PROBE_ONLY); 506 } 507 } 508} 509 510static void __init pSeries_setup_arch(void) 511{ 512 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 513 514 /* Discover PIC type and setup ppc_md accordingly */ 515 pseries_discover_pic(); 516 517 /* openpic global configuration register (64-bit format). */ 518 /* openpic Interrupt Source Unit pointer (64-bit format). */ 519 /* python0 facility area (mmio) (64-bit format) REAL address. */ 520 521 /* init to some ~sane value until calibrate_delay() runs */ 522 loops_per_jiffy = 50000000; 523 524 fwnmi_init(); 525 526 /* By default, only probe PCI (can be overriden by rtas_pci) */ 527 pci_add_flags(PCI_PROBE_ONLY); 528 529 /* Find and initialize PCI host bridges */ 530 init_pci_config_tokens(); 531 find_and_init_phbs(); 532 of_reconfig_notifier_register(&pci_dn_reconfig_nb); 533 534 pSeries_nvram_init(); 535 536 if (firmware_has_feature(FW_FEATURE_LPAR)) { 537 vpa_init(boot_cpuid); 538 ppc_md.power_save = pseries_lpar_idle; 539 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 540 } else { 541 /* No special idle routine */ 542 ppc_md.enable_pmcs = power4_enable_pmcs; 543 } 544 545 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; 546 547 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 548 long rc; 549 550 rc = pSeries_enable_reloc_on_exc(); 551 if (rc == H_P2) { 552 pr_info("Relocation on exceptions not supported\n"); 553 } else if (rc != H_SUCCESS) { 554 pr_warn("Unable to enable relocation on exceptions: " 555 "%ld\n", rc); 556 } 557 } 558} 559 560static int __init pSeries_init_panel(void) 561{ 562 /* Manually leave the kernel version on the panel. */ 563#ifdef __BIG_ENDIAN__ 564 ppc_md.progress("Linux ppc64\n", 0); 565#else 566 ppc_md.progress("Linux ppc64le\n", 0); 567#endif 568 ppc_md.progress(init_utsname()->version, 0); 569 570 return 0; 571} 572machine_arch_initcall(pseries, pSeries_init_panel); 573 574static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 575{ 576 return plpar_hcall_norets(H_SET_DABR, dabr); 577} 578 579static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) 580{ 581 /* Have to set at least one bit in the DABRX according to PAPR */ 582 if (dabrx == 0 && dabr == 0) 583 dabrx = DABRX_USER; 584 /* PAPR says we can only set kernel and user bits */ 585 dabrx &= DABRX_KERNEL | DABRX_USER; 586 587 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); 588} 589 590static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) 591{ 592 /* PAPR says we can't set HYP */ 593 dawrx &= ~DAWRX_HYP; 594 595 return plapr_set_watchpoint0(dawr, dawrx); 596} 597 598#define CMO_CHARACTERISTICS_TOKEN 44 599#define CMO_MAXLENGTH 1026 600 601void pSeries_coalesce_init(void) 602{ 603 struct hvcall_mpp_x_data mpp_x_data; 604 605 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 606 powerpc_firmware_features |= FW_FEATURE_XCMO; 607 else 608 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 609} 610 611/** 612 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 613 * handle that here. (Stolen from parse_system_parameter_string) 614 */ 615static void pSeries_cmo_feature_init(void) 616{ 617 char *ptr, *key, *value, *end; 618 int call_status; 619 int page_order = IOMMU_PAGE_SHIFT_4K; 620 621 pr_debug(" -> fw_cmo_feature_init()\n"); 622 spin_lock(&rtas_data_buf_lock); 623 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 624 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 625 NULL, 626 CMO_CHARACTERISTICS_TOKEN, 627 __pa(rtas_data_buf), 628 RTAS_DATA_BUF_SIZE); 629 630 if (call_status != 0) { 631 spin_unlock(&rtas_data_buf_lock); 632 pr_debug("CMO not available\n"); 633 pr_debug(" <- fw_cmo_feature_init()\n"); 634 return; 635 } 636 637 end = rtas_data_buf + CMO_MAXLENGTH - 2; 638 ptr = rtas_data_buf + 2; /* step over strlen value */ 639 key = value = ptr; 640 641 while (*ptr && (ptr <= end)) { 642 /* Separate the key and value by replacing '=' with '\0' and 643 * point the value at the string after the '=' 644 */ 645 if (ptr[0] == '=') { 646 ptr[0] = '\0'; 647 value = ptr + 1; 648 } else if (ptr[0] == '\0' || ptr[0] == ',') { 649 /* Terminate the string containing the key/value pair */ 650 ptr[0] = '\0'; 651 652 if (key == value) { 653 pr_debug("Malformed key/value pair\n"); 654 /* Never found a '=', end processing */ 655 break; 656 } 657 658 if (0 == strcmp(key, "CMOPageSize")) 659 page_order = simple_strtol(value, NULL, 10); 660 else if (0 == strcmp(key, "PrPSP")) 661 CMO_PrPSP = simple_strtol(value, NULL, 10); 662 else if (0 == strcmp(key, "SecPSP")) 663 CMO_SecPSP = simple_strtol(value, NULL, 10); 664 value = key = ptr + 1; 665 } 666 ptr++; 667 } 668 669 /* Page size is returned as the power of 2 of the page size, 670 * convert to the page size in bytes before returning 671 */ 672 CMO_PageSize = 1 << page_order; 673 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 674 675 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 676 pr_info("CMO enabled\n"); 677 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 678 CMO_SecPSP); 679 powerpc_firmware_features |= FW_FEATURE_CMO; 680 pSeries_coalesce_init(); 681 } else 682 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 683 CMO_SecPSP); 684 spin_unlock(&rtas_data_buf_lock); 685 pr_debug(" <- fw_cmo_feature_init()\n"); 686} 687 688/* 689 * Early initialization. Relocation is on but do not reference unbolted pages 690 */ 691static void __init pSeries_init_early(void) 692{ 693 pr_debug(" -> pSeries_init_early()\n"); 694 695#ifdef CONFIG_HVC_CONSOLE 696 if (firmware_has_feature(FW_FEATURE_LPAR)) 697 hvc_vio_init_early(); 698#endif 699 if (firmware_has_feature(FW_FEATURE_XDABR)) 700 ppc_md.set_dabr = pseries_set_xdabr; 701 else if (firmware_has_feature(FW_FEATURE_DABR)) 702 ppc_md.set_dabr = pseries_set_dabr; 703 704 if (firmware_has_feature(FW_FEATURE_SET_MODE)) 705 ppc_md.set_dawr = pseries_set_dawr; 706 707 pSeries_cmo_feature_init(); 708 iommu_init_early_pSeries(); 709 710 pr_debug(" <- pSeries_init_early()\n"); 711} 712 713/** 714 * pseries_power_off - tell firmware about how to power off the system. 715 * 716 * This function calls either the power-off rtas token in normal cases 717 * or the ibm,power-off-ups token (if present & requested) in case of 718 * a power failure. If power-off token is used, power on will only be 719 * possible with power button press. If ibm,power-off-ups token is used 720 * it will allow auto poweron after power is restored. 721 */ 722static void pseries_power_off(void) 723{ 724 int rc; 725 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 726 727 if (rtas_flash_term_hook) 728 rtas_flash_term_hook(SYS_POWER_OFF); 729 730 if (rtas_poweron_auto == 0 || 731 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 732 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 733 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 734 } else { 735 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 736 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 737 } 738 for (;;); 739} 740 741/* 742 * Called very early, MMU is off, device-tree isn't unflattened 743 */ 744 745static int __init pseries_probe_fw_features(unsigned long node, 746 const char *uname, int depth, 747 void *data) 748{ 749 const char *prop; 750 int len; 751 static int hypertas_found; 752 static int vec5_found; 753 754 if (depth != 1) 755 return 0; 756 757 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 758 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 759 &len); 760 if (prop) { 761 powerpc_firmware_features |= FW_FEATURE_LPAR; 762 fw_hypertas_feature_init(prop, len); 763 } 764 765 hypertas_found = 1; 766 } 767 768 if (!strcmp(uname, "chosen")) { 769 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 770 &len); 771 if (prop) 772 fw_vec5_feature_init(prop, len); 773 774 vec5_found = 1; 775 } 776 777 return hypertas_found && vec5_found; 778} 779 780static int __init pSeries_probe(void) 781{ 782 unsigned long root = of_get_flat_dt_root(); 783 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 784 785 if (dtype == NULL) 786 return 0; 787 if (strcmp(dtype, "chrp")) 788 return 0; 789 790 /* Cell blades firmware claims to be chrp while it's not. Until this 791 * is fixed, we need to avoid those here. 792 */ 793 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 794 of_flat_dt_is_compatible(root, "IBM,CBEA")) 795 return 0; 796 797 pr_debug("pSeries detected, looking for LPAR capability...\n"); 798 799 /* Now try to figure out if we are running on LPAR */ 800 of_scan_flat_dt(pseries_probe_fw_features, NULL); 801 802#ifdef __LITTLE_ENDIAN__ 803 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 804 long rc; 805 /* 806 * Tell the hypervisor that we want our exceptions to 807 * be taken in little endian mode. If this fails we don't 808 * want to use BUG() because it will trigger an exception. 809 */ 810 rc = pseries_little_endian_exceptions(); 811 if (rc) { 812 ppc_md.progress("H_SET_MODE LE exception fail", 0); 813 panic("Could not enable little endian exceptions"); 814 } 815 } 816#endif 817 818 if (firmware_has_feature(FW_FEATURE_LPAR)) 819 hpte_init_lpar(); 820 else 821 hpte_init_native(); 822 823 pm_power_off = pseries_power_off; 824 825 pr_debug("Machine is%s LPAR !\n", 826 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 827 828 return 1; 829} 830 831static int pSeries_pci_probe_mode(struct pci_bus *bus) 832{ 833 if (firmware_has_feature(FW_FEATURE_LPAR)) 834 return PCI_PROBE_DEVTREE; 835 return PCI_PROBE_NORMAL; 836} 837 838#ifndef CONFIG_PCI 839void pSeries_final_fixup(void) { } 840#endif 841 842struct pci_controller_ops pseries_pci_controller_ops = { 843 .probe_mode = pSeries_pci_probe_mode, 844}; 845 846define_machine(pseries) { 847 .name = "pSeries", 848 .probe = pSeries_probe, 849 .setup_arch = pSeries_setup_arch, 850 .init_early = pSeries_init_early, 851 .show_cpuinfo = pSeries_show_cpuinfo, 852 .log_error = pSeries_log_error, 853 .pcibios_fixup = pSeries_final_fixup, 854 .restart = rtas_restart, 855 .halt = rtas_halt, 856 .panic = rtas_os_term, 857 .get_boot_time = rtas_get_boot_time, 858 .get_rtc_time = rtas_get_rtc_time, 859 .set_rtc_time = rtas_set_rtc_time, 860 .calibrate_decr = generic_calibrate_decr, 861 .progress = rtas_progress, 862 .system_reset_exception = pSeries_system_reset_exception, 863 .machine_check_exception = pSeries_machine_check_exception, 864#ifdef CONFIG_KEXEC 865 .machine_kexec = pSeries_machine_kexec, 866#endif 867#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 868 .memory_block_size = pseries_memory_block_size, 869#endif 870}; 871