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(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 } 124 125 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 *node) 255 { 256 struct device_node *np = node; 257 struct pci_dn *pci = NULL; 258 int err = NOTIFY_OK; 259 260 switch (action) { 261 case OF_RECONFIG_ATTACH_NODE: 262 pci = np->parent->data; 263 if (pci) { 264 update_dn_pci_info(np, pci->phb); 265 266 /* Create EEH device for the OF node */ 267 eeh_dev_init(np, pci->phb); 268 } 269 break; 270 default: 271 err = NOTIFY_DONE; 272 break; 273 } 274 return err; 275 } 276 277 static struct notifier_block pci_dn_reconfig_nb = { 278 .notifier_call = pci_dn_reconfig_notifier, 279 }; 280 281 struct kmem_cache *dtl_cache; 282 283 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 284 /* 285 * Allocate space for the dispatch trace log for all possible cpus 286 * and register the buffers with the hypervisor. This is used for 287 * computing time stolen by the hypervisor. 288 */ 289 static int alloc_dispatch_logs(void) 290 { 291 int cpu, ret; 292 struct paca_struct *pp; 293 struct dtl_entry *dtl; 294 295 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 296 return 0; 297 298 if (!dtl_cache) 299 return 0; 300 301 for_each_possible_cpu(cpu) { 302 pp = &paca[cpu]; 303 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 304 if (!dtl) { 305 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 306 cpu); 307 pr_warn("Stolen time statistics will be unreliable\n"); 308 break; 309 } 310 311 pp->dtl_ridx = 0; 312 pp->dispatch_log = dtl; 313 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 314 pp->dtl_curr = dtl; 315 } 316 317 /* Register the DTL for the current (boot) cpu */ 318 dtl = get_paca()->dispatch_log; 319 get_paca()->dtl_ridx = 0; 320 get_paca()->dtl_curr = dtl; 321 get_paca()->lppaca_ptr->dtl_idx = 0; 322 323 /* hypervisor reads buffer length from this field */ 324 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 325 ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); 326 if (ret) 327 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " 328 "with %d\n", smp_processor_id(), 329 hard_smp_processor_id(), ret); 330 get_paca()->lppaca_ptr->dtl_enable_mask = 2; 331 332 return 0; 333 } 334 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 335 static inline int alloc_dispatch_logs(void) 336 { 337 return 0; 338 } 339 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 340 341 static int alloc_dispatch_log_kmem_cache(void) 342 { 343 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, 344 DISPATCH_LOG_BYTES, 0, NULL); 345 if (!dtl_cache) { 346 pr_warn("Failed to create dispatch trace log buffer cache\n"); 347 pr_warn("Stolen time statistics will be unreliable\n"); 348 return 0; 349 } 350 351 return alloc_dispatch_logs(); 352 } 353 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); 354 355 static void pseries_lpar_idle(void) 356 { 357 /* 358 * Default handler to go into low thread priority and possibly 359 * low power mode by cedeing processor to hypervisor 360 */ 361 362 /* Indicate to hypervisor that we are idle. */ 363 get_lppaca()->idle = 1; 364 365 /* 366 * Yield the processor to the hypervisor. We return if 367 * an external interrupt occurs (which are driven prior 368 * to returning here) or if a prod occurs from another 369 * processor. When returning here, external interrupts 370 * are enabled. 371 */ 372 cede_processor(); 373 374 get_lppaca()->idle = 0; 375 } 376 377 /* 378 * Enable relocation on during exceptions. This has partition wide scope and 379 * may take a while to complete, if it takes longer than one second we will 380 * just give up rather than wasting any more time on this - if that turns out 381 * to ever be a problem in practice we can move this into a kernel thread to 382 * finish off the process later in boot. 383 */ 384 long pSeries_enable_reloc_on_exc(void) 385 { 386 long rc; 387 unsigned int delay, total_delay = 0; 388 389 while (1) { 390 rc = enable_reloc_on_exceptions(); 391 if (!H_IS_LONG_BUSY(rc)) 392 return rc; 393 394 delay = get_longbusy_msecs(rc); 395 total_delay += delay; 396 if (total_delay > 1000) { 397 pr_warn("Warning: Giving up waiting to enable " 398 "relocation on exceptions (%u msec)!\n", 399 total_delay); 400 return rc; 401 } 402 403 mdelay(delay); 404 } 405 } 406 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 407 408 long pSeries_disable_reloc_on_exc(void) 409 { 410 long rc; 411 412 while (1) { 413 rc = disable_reloc_on_exceptions(); 414 if (!H_IS_LONG_BUSY(rc)) 415 return rc; 416 mdelay(get_longbusy_msecs(rc)); 417 } 418 } 419 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 420 421 #ifdef CONFIG_KEXEC 422 static void pSeries_machine_kexec(struct kimage *image) 423 { 424 long rc; 425 426 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 427 rc = pSeries_disable_reloc_on_exc(); 428 if (rc != H_SUCCESS) 429 pr_warning("Warning: Failed to disable relocation on " 430 "exceptions: %ld\n", rc); 431 } 432 433 default_machine_kexec(image); 434 } 435 #endif 436 437 #ifdef __LITTLE_ENDIAN__ 438 long pseries_big_endian_exceptions(void) 439 { 440 long rc; 441 442 while (1) { 443 rc = enable_big_endian_exceptions(); 444 if (!H_IS_LONG_BUSY(rc)) 445 return rc; 446 mdelay(get_longbusy_msecs(rc)); 447 } 448 } 449 450 static long pseries_little_endian_exceptions(void) 451 { 452 long rc; 453 454 while (1) { 455 rc = enable_little_endian_exceptions(); 456 if (!H_IS_LONG_BUSY(rc)) 457 return rc; 458 mdelay(get_longbusy_msecs(rc)); 459 } 460 } 461 #endif 462 463 static void __init pSeries_setup_arch(void) 464 { 465 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 466 467 /* Discover PIC type and setup ppc_md accordingly */ 468 pseries_discover_pic(); 469 470 /* openpic global configuration register (64-bit format). */ 471 /* openpic Interrupt Source Unit pointer (64-bit format). */ 472 /* python0 facility area (mmio) (64-bit format) REAL address. */ 473 474 /* init to some ~sane value until calibrate_delay() runs */ 475 loops_per_jiffy = 50000000; 476 477 fwnmi_init(); 478 479 /* By default, only probe PCI (can be overriden by rtas_pci) */ 480 pci_add_flags(PCI_PROBE_ONLY); 481 482 /* Find and initialize PCI host bridges */ 483 init_pci_config_tokens(); 484 find_and_init_phbs(); 485 of_reconfig_notifier_register(&pci_dn_reconfig_nb); 486 487 pSeries_nvram_init(); 488 489 if (firmware_has_feature(FW_FEATURE_LPAR)) { 490 vpa_init(boot_cpuid); 491 ppc_md.power_save = pseries_lpar_idle; 492 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 493 } else { 494 /* No special idle routine */ 495 ppc_md.enable_pmcs = power4_enable_pmcs; 496 } 497 498 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; 499 500 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 501 long rc; 502 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) { 503 pr_warn("Unable to enable relocation on exceptions: " 504 "%ld\n", rc); 505 } 506 } 507 } 508 509 static int __init pSeries_init_panel(void) 510 { 511 /* Manually leave the kernel version on the panel. */ 512 #ifdef __BIG_ENDIAN__ 513 ppc_md.progress("Linux ppc64\n", 0); 514 #else 515 ppc_md.progress("Linux ppc64le\n", 0); 516 #endif 517 ppc_md.progress(init_utsname()->version, 0); 518 519 return 0; 520 } 521 machine_arch_initcall(pseries, pSeries_init_panel); 522 523 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 524 { 525 return plpar_hcall_norets(H_SET_DABR, dabr); 526 } 527 528 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) 529 { 530 /* Have to set at least one bit in the DABRX according to PAPR */ 531 if (dabrx == 0 && dabr == 0) 532 dabrx = DABRX_USER; 533 /* PAPR says we can only set kernel and user bits */ 534 dabrx &= DABRX_KERNEL | DABRX_USER; 535 536 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); 537 } 538 539 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) 540 { 541 /* PAPR says we can't set HYP */ 542 dawrx &= ~DAWRX_HYP; 543 544 return plapr_set_watchpoint0(dawr, dawrx); 545 } 546 547 #define CMO_CHARACTERISTICS_TOKEN 44 548 #define CMO_MAXLENGTH 1026 549 550 void pSeries_coalesce_init(void) 551 { 552 struct hvcall_mpp_x_data mpp_x_data; 553 554 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 555 powerpc_firmware_features |= FW_FEATURE_XCMO; 556 else 557 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 558 } 559 560 /** 561 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 562 * handle that here. (Stolen from parse_system_parameter_string) 563 */ 564 void pSeries_cmo_feature_init(void) 565 { 566 char *ptr, *key, *value, *end; 567 int call_status; 568 int page_order = IOMMU_PAGE_SHIFT_4K; 569 570 pr_debug(" -> fw_cmo_feature_init()\n"); 571 spin_lock(&rtas_data_buf_lock); 572 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 573 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 574 NULL, 575 CMO_CHARACTERISTICS_TOKEN, 576 __pa(rtas_data_buf), 577 RTAS_DATA_BUF_SIZE); 578 579 if (call_status != 0) { 580 spin_unlock(&rtas_data_buf_lock); 581 pr_debug("CMO not available\n"); 582 pr_debug(" <- fw_cmo_feature_init()\n"); 583 return; 584 } 585 586 end = rtas_data_buf + CMO_MAXLENGTH - 2; 587 ptr = rtas_data_buf + 2; /* step over strlen value */ 588 key = value = ptr; 589 590 while (*ptr && (ptr <= end)) { 591 /* Separate the key and value by replacing '=' with '\0' and 592 * point the value at the string after the '=' 593 */ 594 if (ptr[0] == '=') { 595 ptr[0] = '\0'; 596 value = ptr + 1; 597 } else if (ptr[0] == '\0' || ptr[0] == ',') { 598 /* Terminate the string containing the key/value pair */ 599 ptr[0] = '\0'; 600 601 if (key == value) { 602 pr_debug("Malformed key/value pair\n"); 603 /* Never found a '=', end processing */ 604 break; 605 } 606 607 if (0 == strcmp(key, "CMOPageSize")) 608 page_order = simple_strtol(value, NULL, 10); 609 else if (0 == strcmp(key, "PrPSP")) 610 CMO_PrPSP = simple_strtol(value, NULL, 10); 611 else if (0 == strcmp(key, "SecPSP")) 612 CMO_SecPSP = simple_strtol(value, NULL, 10); 613 value = key = ptr + 1; 614 } 615 ptr++; 616 } 617 618 /* Page size is returned as the power of 2 of the page size, 619 * convert to the page size in bytes before returning 620 */ 621 CMO_PageSize = 1 << page_order; 622 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 623 624 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 625 pr_info("CMO enabled\n"); 626 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 627 CMO_SecPSP); 628 powerpc_firmware_features |= FW_FEATURE_CMO; 629 pSeries_coalesce_init(); 630 } else 631 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 632 CMO_SecPSP); 633 spin_unlock(&rtas_data_buf_lock); 634 pr_debug(" <- fw_cmo_feature_init()\n"); 635 } 636 637 /* 638 * Early initialization. Relocation is on but do not reference unbolted pages 639 */ 640 static void __init pSeries_init_early(void) 641 { 642 pr_debug(" -> pSeries_init_early()\n"); 643 644 #ifdef CONFIG_HVC_CONSOLE 645 if (firmware_has_feature(FW_FEATURE_LPAR)) 646 hvc_vio_init_early(); 647 #endif 648 if (firmware_has_feature(FW_FEATURE_XDABR)) 649 ppc_md.set_dabr = pseries_set_xdabr; 650 else if (firmware_has_feature(FW_FEATURE_DABR)) 651 ppc_md.set_dabr = pseries_set_dabr; 652 653 if (firmware_has_feature(FW_FEATURE_SET_MODE)) 654 ppc_md.set_dawr = pseries_set_dawr; 655 656 pSeries_cmo_feature_init(); 657 iommu_init_early_pSeries(); 658 659 pr_debug(" <- pSeries_init_early()\n"); 660 } 661 662 /* 663 * Called very early, MMU is off, device-tree isn't unflattened 664 */ 665 666 static int __init pseries_probe_fw_features(unsigned long node, 667 const char *uname, int depth, 668 void *data) 669 { 670 const char *prop; 671 int len; 672 static int hypertas_found; 673 static int vec5_found; 674 675 if (depth != 1) 676 return 0; 677 678 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 679 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 680 &len); 681 if (prop) { 682 powerpc_firmware_features |= FW_FEATURE_LPAR; 683 fw_hypertas_feature_init(prop, len); 684 } 685 686 hypertas_found = 1; 687 } 688 689 if (!strcmp(uname, "chosen")) { 690 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 691 &len); 692 if (prop) 693 fw_vec5_feature_init(prop, len); 694 695 vec5_found = 1; 696 } 697 698 return hypertas_found && vec5_found; 699 } 700 701 static int __init pSeries_probe(void) 702 { 703 unsigned long root = of_get_flat_dt_root(); 704 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 705 706 if (dtype == NULL) 707 return 0; 708 if (strcmp(dtype, "chrp")) 709 return 0; 710 711 /* Cell blades firmware claims to be chrp while it's not. Until this 712 * is fixed, we need to avoid those here. 713 */ 714 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 715 of_flat_dt_is_compatible(root, "IBM,CBEA")) 716 return 0; 717 718 pr_debug("pSeries detected, looking for LPAR capability...\n"); 719 720 /* Now try to figure out if we are running on LPAR */ 721 of_scan_flat_dt(pseries_probe_fw_features, NULL); 722 723 #ifdef __LITTLE_ENDIAN__ 724 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 725 long rc; 726 /* 727 * Tell the hypervisor that we want our exceptions to 728 * be taken in little endian mode. If this fails we don't 729 * want to use BUG() because it will trigger an exception. 730 */ 731 rc = pseries_little_endian_exceptions(); 732 if (rc) { 733 ppc_md.progress("H_SET_MODE LE exception fail", 0); 734 panic("Could not enable little endian exceptions"); 735 } 736 } 737 #endif 738 739 if (firmware_has_feature(FW_FEATURE_LPAR)) 740 hpte_init_lpar(); 741 else 742 hpte_init_native(); 743 744 pr_debug("Machine is%s LPAR !\n", 745 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 746 747 return 1; 748 } 749 750 static int pSeries_pci_probe_mode(struct pci_bus *bus) 751 { 752 if (firmware_has_feature(FW_FEATURE_LPAR)) 753 return PCI_PROBE_DEVTREE; 754 return PCI_PROBE_NORMAL; 755 } 756 757 /** 758 * pSeries_power_off - tell firmware about how to power off the system. 759 * 760 * This function calls either the power-off rtas token in normal cases 761 * or the ibm,power-off-ups token (if present & requested) in case of 762 * a power failure. If power-off token is used, power on will only be 763 * possible with power button press. If ibm,power-off-ups token is used 764 * it will allow auto poweron after power is restored. 765 */ 766 static void pSeries_power_off(void) 767 { 768 int rc; 769 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 770 771 if (rtas_flash_term_hook) 772 rtas_flash_term_hook(SYS_POWER_OFF); 773 774 if (rtas_poweron_auto == 0 || 775 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 776 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 777 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 778 } else { 779 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 780 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 781 } 782 for (;;); 783 } 784 785 #ifndef CONFIG_PCI 786 void pSeries_final_fixup(void) { } 787 #endif 788 789 define_machine(pseries) { 790 .name = "pSeries", 791 .probe = pSeries_probe, 792 .setup_arch = pSeries_setup_arch, 793 .init_early = pSeries_init_early, 794 .show_cpuinfo = pSeries_show_cpuinfo, 795 .log_error = pSeries_log_error, 796 .pcibios_fixup = pSeries_final_fixup, 797 .pci_probe_mode = pSeries_pci_probe_mode, 798 .restart = rtas_restart, 799 .power_off = pSeries_power_off, 800 .halt = rtas_halt, 801 .panic = rtas_os_term, 802 .get_boot_time = rtas_get_boot_time, 803 .get_rtc_time = rtas_get_rtc_time, 804 .set_rtc_time = rtas_set_rtc_time, 805 .calibrate_decr = generic_calibrate_decr, 806 .progress = rtas_progress, 807 .system_reset_exception = pSeries_system_reset_exception, 808 .machine_check_exception = pSeries_machine_check_exception, 809 #ifdef CONFIG_KEXEC 810 .machine_kexec = pSeries_machine_kexec, 811 #endif 812 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 813 .memory_block_size = pseries_memory_block_size, 814 #endif 815 }; 816