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 72 int CMO_PrPSP = -1; 73 int CMO_SecPSP = -1; 74 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K); 75 EXPORT_SYMBOL(CMO_PageSize); 76 77 int fwnmi_active; /* TRUE if an FWNMI handler is present */ 78 79 static struct device_node *pSeries_mpic_node; 80 81 static 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 */ 96 static 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 } 113 114 static void pseries_8259_cascade(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 } 124 125 static 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 } 173 174 static 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 } 214 215 static void __init pseries_xics_init_IRQ(void) 216 { 217 xics_init(); 218 pseries_setup_i8259_cascade(); 219 } 220 221 static 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 } 229 230 static 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 } 253 254 static 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 *parent, *np = rd->dn; 258 struct pci_dn *pdn; 259 int err = NOTIFY_OK; 260 261 switch (action) { 262 case OF_RECONFIG_ATTACH_NODE: 263 parent = of_get_parent(np); 264 pdn = parent ? PCI_DN(parent) : NULL; 265 if (pdn) { 266 /* Create pdn and EEH device */ 267 update_dn_pci_info(np, pdn->phb); 268 eeh_dev_init(PCI_DN(np), pdn->phb); 269 } 270 271 of_node_put(parent); 272 break; 273 case OF_RECONFIG_DETACH_NODE: 274 pdn = PCI_DN(np); 275 if (pdn) 276 list_del(&pdn->list); 277 break; 278 default: 279 err = NOTIFY_DONE; 280 break; 281 } 282 return err; 283 } 284 285 static struct notifier_block pci_dn_reconfig_nb = { 286 .notifier_call = pci_dn_reconfig_notifier, 287 }; 288 289 struct kmem_cache *dtl_cache; 290 291 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 292 /* 293 * Allocate space for the dispatch trace log for all possible cpus 294 * and register the buffers with the hypervisor. This is used for 295 * computing time stolen by the hypervisor. 296 */ 297 static int alloc_dispatch_logs(void) 298 { 299 int cpu, ret; 300 struct paca_struct *pp; 301 struct dtl_entry *dtl; 302 303 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 304 return 0; 305 306 if (!dtl_cache) 307 return 0; 308 309 for_each_possible_cpu(cpu) { 310 pp = &paca[cpu]; 311 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 312 if (!dtl) { 313 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 314 cpu); 315 pr_warn("Stolen time statistics will be unreliable\n"); 316 break; 317 } 318 319 pp->dtl_ridx = 0; 320 pp->dispatch_log = dtl; 321 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 322 pp->dtl_curr = dtl; 323 } 324 325 /* Register the DTL for the current (boot) cpu */ 326 dtl = get_paca()->dispatch_log; 327 get_paca()->dtl_ridx = 0; 328 get_paca()->dtl_curr = dtl; 329 get_paca()->lppaca_ptr->dtl_idx = 0; 330 331 /* hypervisor reads buffer length from this field */ 332 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 333 ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); 334 if (ret) 335 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " 336 "with %d\n", smp_processor_id(), 337 hard_smp_processor_id(), ret); 338 get_paca()->lppaca_ptr->dtl_enable_mask = 2; 339 340 return 0; 341 } 342 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 343 static inline int alloc_dispatch_logs(void) 344 { 345 return 0; 346 } 347 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 348 349 static int alloc_dispatch_log_kmem_cache(void) 350 { 351 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, 352 DISPATCH_LOG_BYTES, 0, NULL); 353 if (!dtl_cache) { 354 pr_warn("Failed to create dispatch trace log buffer cache\n"); 355 pr_warn("Stolen time statistics will be unreliable\n"); 356 return 0; 357 } 358 359 return alloc_dispatch_logs(); 360 } 361 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); 362 363 static void pseries_lpar_idle(void) 364 { 365 /* 366 * Default handler to go into low thread priority and possibly 367 * low power mode by cedeing processor to hypervisor 368 */ 369 370 /* Indicate to hypervisor that we are idle. */ 371 get_lppaca()->idle = 1; 372 373 /* 374 * Yield the processor to the hypervisor. We return if 375 * an external interrupt occurs (which are driven prior 376 * to returning here) or if a prod occurs from another 377 * processor. When returning here, external interrupts 378 * are enabled. 379 */ 380 cede_processor(); 381 382 get_lppaca()->idle = 0; 383 } 384 385 /* 386 * Enable relocation on during exceptions. This has partition wide scope and 387 * may take a while to complete, if it takes longer than one second we will 388 * just give up rather than wasting any more time on this - if that turns out 389 * to ever be a problem in practice we can move this into a kernel thread to 390 * finish off the process later in boot. 391 */ 392 long pSeries_enable_reloc_on_exc(void) 393 { 394 long rc; 395 unsigned int delay, total_delay = 0; 396 397 while (1) { 398 rc = enable_reloc_on_exceptions(); 399 if (!H_IS_LONG_BUSY(rc)) 400 return rc; 401 402 delay = get_longbusy_msecs(rc); 403 total_delay += delay; 404 if (total_delay > 1000) { 405 pr_warn("Warning: Giving up waiting to enable " 406 "relocation on exceptions (%u msec)!\n", 407 total_delay); 408 return rc; 409 } 410 411 mdelay(delay); 412 } 413 } 414 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 415 416 long pSeries_disable_reloc_on_exc(void) 417 { 418 long rc; 419 420 while (1) { 421 rc = disable_reloc_on_exceptions(); 422 if (!H_IS_LONG_BUSY(rc)) 423 return rc; 424 mdelay(get_longbusy_msecs(rc)); 425 } 426 } 427 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 428 429 #ifdef CONFIG_KEXEC 430 static void pSeries_machine_kexec(struct kimage *image) 431 { 432 long rc; 433 434 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 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 find_and_init_phbs(void) 472 { 473 struct device_node *node; 474 struct pci_controller *phb; 475 struct device_node *root = of_find_node_by_path("/"); 476 477 for_each_child_of_node(root, node) { 478 if (node->type == NULL || (strcmp(node->type, "pci") != 0 && 479 strcmp(node->type, "pciex") != 0)) 480 continue; 481 482 phb = pcibios_alloc_controller(node); 483 if (!phb) 484 continue; 485 rtas_setup_phb(phb); 486 pci_process_bridge_OF_ranges(phb, node, 0); 487 isa_bridge_find_early(phb); 488 phb->controller_ops = pseries_pci_controller_ops; 489 } 490 491 of_node_put(root); 492 pci_devs_phb_init(); 493 494 /* 495 * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties 496 * in chosen. 497 */ 498 if (of_chosen) { 499 const int *prop; 500 501 prop = of_get_property(of_chosen, 502 "linux,pci-probe-only", NULL); 503 if (prop) { 504 if (*prop) 505 pci_add_flags(PCI_PROBE_ONLY); 506 else 507 pci_clear_flags(PCI_PROBE_ONLY); 508 } 509 } 510 } 511 512 static void __init pSeries_setup_arch(void) 513 { 514 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 515 516 /* Discover PIC type and setup ppc_md accordingly */ 517 pseries_discover_pic(); 518 519 /* openpic global configuration register (64-bit format). */ 520 /* openpic Interrupt Source Unit pointer (64-bit format). */ 521 /* python0 facility area (mmio) (64-bit format) REAL address. */ 522 523 /* init to some ~sane value until calibrate_delay() runs */ 524 loops_per_jiffy = 50000000; 525 526 fwnmi_init(); 527 528 /* By default, only probe PCI (can be overriden by rtas_pci) */ 529 pci_add_flags(PCI_PROBE_ONLY); 530 531 /* Find and initialize PCI host bridges */ 532 init_pci_config_tokens(); 533 find_and_init_phbs(); 534 of_reconfig_notifier_register(&pci_dn_reconfig_nb); 535 536 pSeries_nvram_init(); 537 538 if (firmware_has_feature(FW_FEATURE_LPAR)) { 539 vpa_init(boot_cpuid); 540 ppc_md.power_save = pseries_lpar_idle; 541 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 542 } else { 543 /* No special idle routine */ 544 ppc_md.enable_pmcs = power4_enable_pmcs; 545 } 546 547 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; 548 549 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 550 long rc; 551 552 rc = pSeries_enable_reloc_on_exc(); 553 if (rc == H_P2) { 554 pr_info("Relocation on exceptions not supported\n"); 555 } else if (rc != H_SUCCESS) { 556 pr_warn("Unable to enable relocation on exceptions: " 557 "%ld\n", rc); 558 } 559 } 560 } 561 562 static int __init pSeries_init_panel(void) 563 { 564 /* Manually leave the kernel version on the panel. */ 565 #ifdef __BIG_ENDIAN__ 566 ppc_md.progress("Linux ppc64\n", 0); 567 #else 568 ppc_md.progress("Linux ppc64le\n", 0); 569 #endif 570 ppc_md.progress(init_utsname()->version, 0); 571 572 return 0; 573 } 574 machine_arch_initcall(pseries, pSeries_init_panel); 575 576 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 577 { 578 return plpar_hcall_norets(H_SET_DABR, dabr); 579 } 580 581 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) 582 { 583 /* Have to set at least one bit in the DABRX according to PAPR */ 584 if (dabrx == 0 && dabr == 0) 585 dabrx = DABRX_USER; 586 /* PAPR says we can only set kernel and user bits */ 587 dabrx &= DABRX_KERNEL | DABRX_USER; 588 589 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); 590 } 591 592 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) 593 { 594 /* PAPR says we can't set HYP */ 595 dawrx &= ~DAWRX_HYP; 596 597 return plapr_set_watchpoint0(dawr, dawrx); 598 } 599 600 #define CMO_CHARACTERISTICS_TOKEN 44 601 #define CMO_MAXLENGTH 1026 602 603 void pSeries_coalesce_init(void) 604 { 605 struct hvcall_mpp_x_data mpp_x_data; 606 607 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 608 powerpc_firmware_features |= FW_FEATURE_XCMO; 609 else 610 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 611 } 612 613 /** 614 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 615 * handle that here. (Stolen from parse_system_parameter_string) 616 */ 617 static void pSeries_cmo_feature_init(void) 618 { 619 char *ptr, *key, *value, *end; 620 int call_status; 621 int page_order = IOMMU_PAGE_SHIFT_4K; 622 623 pr_debug(" -> fw_cmo_feature_init()\n"); 624 spin_lock(&rtas_data_buf_lock); 625 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 626 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 627 NULL, 628 CMO_CHARACTERISTICS_TOKEN, 629 __pa(rtas_data_buf), 630 RTAS_DATA_BUF_SIZE); 631 632 if (call_status != 0) { 633 spin_unlock(&rtas_data_buf_lock); 634 pr_debug("CMO not available\n"); 635 pr_debug(" <- fw_cmo_feature_init()\n"); 636 return; 637 } 638 639 end = rtas_data_buf + CMO_MAXLENGTH - 2; 640 ptr = rtas_data_buf + 2; /* step over strlen value */ 641 key = value = ptr; 642 643 while (*ptr && (ptr <= end)) { 644 /* Separate the key and value by replacing '=' with '\0' and 645 * point the value at the string after the '=' 646 */ 647 if (ptr[0] == '=') { 648 ptr[0] = '\0'; 649 value = ptr + 1; 650 } else if (ptr[0] == '\0' || ptr[0] == ',') { 651 /* Terminate the string containing the key/value pair */ 652 ptr[0] = '\0'; 653 654 if (key == value) { 655 pr_debug("Malformed key/value pair\n"); 656 /* Never found a '=', end processing */ 657 break; 658 } 659 660 if (0 == strcmp(key, "CMOPageSize")) 661 page_order = simple_strtol(value, NULL, 10); 662 else if (0 == strcmp(key, "PrPSP")) 663 CMO_PrPSP = simple_strtol(value, NULL, 10); 664 else if (0 == strcmp(key, "SecPSP")) 665 CMO_SecPSP = simple_strtol(value, NULL, 10); 666 value = key = ptr + 1; 667 } 668 ptr++; 669 } 670 671 /* Page size is returned as the power of 2 of the page size, 672 * convert to the page size in bytes before returning 673 */ 674 CMO_PageSize = 1 << page_order; 675 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 676 677 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 678 pr_info("CMO enabled\n"); 679 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 680 CMO_SecPSP); 681 powerpc_firmware_features |= FW_FEATURE_CMO; 682 pSeries_coalesce_init(); 683 } else 684 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 685 CMO_SecPSP); 686 spin_unlock(&rtas_data_buf_lock); 687 pr_debug(" <- fw_cmo_feature_init()\n"); 688 } 689 690 /* 691 * Early initialization. Relocation is on but do not reference unbolted pages 692 */ 693 static void __init pSeries_init_early(void) 694 { 695 pr_debug(" -> pSeries_init_early()\n"); 696 697 #ifdef CONFIG_HVC_CONSOLE 698 if (firmware_has_feature(FW_FEATURE_LPAR)) 699 hvc_vio_init_early(); 700 #endif 701 if (firmware_has_feature(FW_FEATURE_XDABR)) 702 ppc_md.set_dabr = pseries_set_xdabr; 703 else if (firmware_has_feature(FW_FEATURE_DABR)) 704 ppc_md.set_dabr = pseries_set_dabr; 705 706 if (firmware_has_feature(FW_FEATURE_SET_MODE)) 707 ppc_md.set_dawr = pseries_set_dawr; 708 709 pSeries_cmo_feature_init(); 710 iommu_init_early_pSeries(); 711 712 pr_debug(" <- pSeries_init_early()\n"); 713 } 714 715 /** 716 * pseries_power_off - tell firmware about how to power off the system. 717 * 718 * This function calls either the power-off rtas token in normal cases 719 * or the ibm,power-off-ups token (if present & requested) in case of 720 * a power failure. If power-off token is used, power on will only be 721 * possible with power button press. If ibm,power-off-ups token is used 722 * it will allow auto poweron after power is restored. 723 */ 724 static void pseries_power_off(void) 725 { 726 int rc; 727 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 728 729 if (rtas_flash_term_hook) 730 rtas_flash_term_hook(SYS_POWER_OFF); 731 732 if (rtas_poweron_auto == 0 || 733 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 734 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 735 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 736 } else { 737 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 738 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 739 } 740 for (;;); 741 } 742 743 /* 744 * Called very early, MMU is off, device-tree isn't unflattened 745 */ 746 747 static int __init pseries_probe_fw_features(unsigned long node, 748 const char *uname, int depth, 749 void *data) 750 { 751 const char *prop; 752 int len; 753 static int hypertas_found; 754 static int vec5_found; 755 756 if (depth != 1) 757 return 0; 758 759 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 760 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 761 &len); 762 if (prop) { 763 powerpc_firmware_features |= FW_FEATURE_LPAR; 764 fw_hypertas_feature_init(prop, len); 765 } 766 767 hypertas_found = 1; 768 } 769 770 if (!strcmp(uname, "chosen")) { 771 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 772 &len); 773 if (prop) 774 fw_vec5_feature_init(prop, len); 775 776 vec5_found = 1; 777 } 778 779 return hypertas_found && vec5_found; 780 } 781 782 static int __init pSeries_probe(void) 783 { 784 unsigned long root = of_get_flat_dt_root(); 785 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 786 787 if (dtype == NULL) 788 return 0; 789 if (strcmp(dtype, "chrp")) 790 return 0; 791 792 /* Cell blades firmware claims to be chrp while it's not. Until this 793 * is fixed, we need to avoid those here. 794 */ 795 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 796 of_flat_dt_is_compatible(root, "IBM,CBEA")) 797 return 0; 798 799 pr_debug("pSeries detected, looking for LPAR capability...\n"); 800 801 /* Now try to figure out if we are running on LPAR */ 802 of_scan_flat_dt(pseries_probe_fw_features, NULL); 803 804 #ifdef __LITTLE_ENDIAN__ 805 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 806 long rc; 807 /* 808 * Tell the hypervisor that we want our exceptions to 809 * be taken in little endian mode. If this fails we don't 810 * want to use BUG() because it will trigger an exception. 811 */ 812 rc = pseries_little_endian_exceptions(); 813 if (rc) { 814 ppc_md.progress("H_SET_MODE LE exception fail", 0); 815 panic("Could not enable little endian exceptions"); 816 } 817 } 818 #endif 819 820 if (firmware_has_feature(FW_FEATURE_LPAR)) 821 hpte_init_lpar(); 822 else 823 hpte_init_native(); 824 825 pm_power_off = pseries_power_off; 826 827 pr_debug("Machine is%s LPAR !\n", 828 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 829 830 return 1; 831 } 832 833 static int pSeries_pci_probe_mode(struct pci_bus *bus) 834 { 835 if (firmware_has_feature(FW_FEATURE_LPAR)) 836 return PCI_PROBE_DEVTREE; 837 return PCI_PROBE_NORMAL; 838 } 839 840 #ifndef CONFIG_PCI 841 void pSeries_final_fixup(void) { } 842 #endif 843 844 struct pci_controller_ops pseries_pci_controller_ops = { 845 .probe_mode = pSeries_pci_probe_mode, 846 }; 847 848 define_machine(pseries) { 849 .name = "pSeries", 850 .probe = pSeries_probe, 851 .setup_arch = pSeries_setup_arch, 852 .init_early = pSeries_init_early, 853 .show_cpuinfo = pSeries_show_cpuinfo, 854 .log_error = pSeries_log_error, 855 .pcibios_fixup = pSeries_final_fixup, 856 .restart = rtas_restart, 857 .halt = rtas_halt, 858 .panic = rtas_os_term, 859 .get_boot_time = rtas_get_boot_time, 860 .get_rtc_time = rtas_get_rtc_time, 861 .set_rtc_time = rtas_set_rtc_time, 862 .calibrate_decr = generic_calibrate_decr, 863 .progress = rtas_progress, 864 .system_reset_exception = pSeries_system_reset_exception, 865 .machine_check_exception = pSeries_machine_check_exception, 866 #ifdef CONFIG_KEXEC 867 .machine_kexec = pSeries_machine_kexec, 868 #endif 869 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 870 .memory_block_size = pseries_memory_block_size, 871 #endif 872 }; 873