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 *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(np, pci->phb); 269 } 270 break; 271 default: 272 err = NOTIFY_DONE; 273 break; 274 } 275 return err; 276 } 277 278 static struct notifier_block pci_dn_reconfig_nb = { 279 .notifier_call = pci_dn_reconfig_notifier, 280 }; 281 282 struct kmem_cache *dtl_cache; 283 284 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 285 /* 286 * Allocate space for the dispatch trace log for all possible cpus 287 * and register the buffers with the hypervisor. This is used for 288 * computing time stolen by the hypervisor. 289 */ 290 static int alloc_dispatch_logs(void) 291 { 292 int cpu, ret; 293 struct paca_struct *pp; 294 struct dtl_entry *dtl; 295 296 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 297 return 0; 298 299 if (!dtl_cache) 300 return 0; 301 302 for_each_possible_cpu(cpu) { 303 pp = &paca[cpu]; 304 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 305 if (!dtl) { 306 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 307 cpu); 308 pr_warn("Stolen time statistics will be unreliable\n"); 309 break; 310 } 311 312 pp->dtl_ridx = 0; 313 pp->dispatch_log = dtl; 314 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 315 pp->dtl_curr = dtl; 316 } 317 318 /* Register the DTL for the current (boot) cpu */ 319 dtl = get_paca()->dispatch_log; 320 get_paca()->dtl_ridx = 0; 321 get_paca()->dtl_curr = dtl; 322 get_paca()->lppaca_ptr->dtl_idx = 0; 323 324 /* hypervisor reads buffer length from this field */ 325 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 326 ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); 327 if (ret) 328 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " 329 "with %d\n", smp_processor_id(), 330 hard_smp_processor_id(), ret); 331 get_paca()->lppaca_ptr->dtl_enable_mask = 2; 332 333 return 0; 334 } 335 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 336 static inline int alloc_dispatch_logs(void) 337 { 338 return 0; 339 } 340 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 341 342 static int alloc_dispatch_log_kmem_cache(void) 343 { 344 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, 345 DISPATCH_LOG_BYTES, 0, NULL); 346 if (!dtl_cache) { 347 pr_warn("Failed to create dispatch trace log buffer cache\n"); 348 pr_warn("Stolen time statistics will be unreliable\n"); 349 return 0; 350 } 351 352 return alloc_dispatch_logs(); 353 } 354 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); 355 356 static void pseries_lpar_idle(void) 357 { 358 /* 359 * Default handler to go into low thread priority and possibly 360 * low power mode by cedeing processor to hypervisor 361 */ 362 363 /* Indicate to hypervisor that we are idle. */ 364 get_lppaca()->idle = 1; 365 366 /* 367 * Yield the processor to the hypervisor. We return if 368 * an external interrupt occurs (which are driven prior 369 * to returning here) or if a prod occurs from another 370 * processor. When returning here, external interrupts 371 * are enabled. 372 */ 373 cede_processor(); 374 375 get_lppaca()->idle = 0; 376 } 377 378 /* 379 * Enable relocation on during exceptions. This has partition wide scope and 380 * may take a while to complete, if it takes longer than one second we will 381 * just give up rather than wasting any more time on this - if that turns out 382 * to ever be a problem in practice we can move this into a kernel thread to 383 * finish off the process later in boot. 384 */ 385 long pSeries_enable_reloc_on_exc(void) 386 { 387 long rc; 388 unsigned int delay, total_delay = 0; 389 390 while (1) { 391 rc = enable_reloc_on_exceptions(); 392 if (!H_IS_LONG_BUSY(rc)) 393 return rc; 394 395 delay = get_longbusy_msecs(rc); 396 total_delay += delay; 397 if (total_delay > 1000) { 398 pr_warn("Warning: Giving up waiting to enable " 399 "relocation on exceptions (%u msec)!\n", 400 total_delay); 401 return rc; 402 } 403 404 mdelay(delay); 405 } 406 } 407 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc); 408 409 long pSeries_disable_reloc_on_exc(void) 410 { 411 long rc; 412 413 while (1) { 414 rc = disable_reloc_on_exceptions(); 415 if (!H_IS_LONG_BUSY(rc)) 416 return rc; 417 mdelay(get_longbusy_msecs(rc)); 418 } 419 } 420 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc); 421 422 #ifdef CONFIG_KEXEC 423 static void pSeries_machine_kexec(struct kimage *image) 424 { 425 long rc; 426 427 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 428 rc = pSeries_disable_reloc_on_exc(); 429 if (rc != H_SUCCESS) 430 pr_warning("Warning: Failed to disable relocation on " 431 "exceptions: %ld\n", rc); 432 } 433 434 default_machine_kexec(image); 435 } 436 #endif 437 438 #ifdef __LITTLE_ENDIAN__ 439 long pseries_big_endian_exceptions(void) 440 { 441 long rc; 442 443 while (1) { 444 rc = enable_big_endian_exceptions(); 445 if (!H_IS_LONG_BUSY(rc)) 446 return rc; 447 mdelay(get_longbusy_msecs(rc)); 448 } 449 } 450 451 static long pseries_little_endian_exceptions(void) 452 { 453 long rc; 454 455 while (1) { 456 rc = enable_little_endian_exceptions(); 457 if (!H_IS_LONG_BUSY(rc)) 458 return rc; 459 mdelay(get_longbusy_msecs(rc)); 460 } 461 } 462 #endif 463 464 static void __init pSeries_setup_arch(void) 465 { 466 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 467 468 /* Discover PIC type and setup ppc_md accordingly */ 469 pseries_discover_pic(); 470 471 /* openpic global configuration register (64-bit format). */ 472 /* openpic Interrupt Source Unit pointer (64-bit format). */ 473 /* python0 facility area (mmio) (64-bit format) REAL address. */ 474 475 /* init to some ~sane value until calibrate_delay() runs */ 476 loops_per_jiffy = 50000000; 477 478 fwnmi_init(); 479 480 /* By default, only probe PCI (can be overriden by rtas_pci) */ 481 pci_add_flags(PCI_PROBE_ONLY); 482 483 /* Find and initialize PCI host bridges */ 484 init_pci_config_tokens(); 485 find_and_init_phbs(); 486 of_reconfig_notifier_register(&pci_dn_reconfig_nb); 487 488 pSeries_nvram_init(); 489 490 if (firmware_has_feature(FW_FEATURE_LPAR)) { 491 vpa_init(boot_cpuid); 492 ppc_md.power_save = pseries_lpar_idle; 493 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 494 } else { 495 /* No special idle routine */ 496 ppc_md.enable_pmcs = power4_enable_pmcs; 497 } 498 499 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; 500 501 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 502 long rc; 503 504 rc = pSeries_enable_reloc_on_exc(); 505 if (rc == H_P2) { 506 pr_info("Relocation on exceptions not supported\n"); 507 } else if (rc != H_SUCCESS) { 508 pr_warn("Unable to enable relocation on exceptions: " 509 "%ld\n", rc); 510 } 511 } 512 } 513 514 static int __init pSeries_init_panel(void) 515 { 516 /* Manually leave the kernel version on the panel. */ 517 #ifdef __BIG_ENDIAN__ 518 ppc_md.progress("Linux ppc64\n", 0); 519 #else 520 ppc_md.progress("Linux ppc64le\n", 0); 521 #endif 522 ppc_md.progress(init_utsname()->version, 0); 523 524 return 0; 525 } 526 machine_arch_initcall(pseries, pSeries_init_panel); 527 528 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) 529 { 530 return plpar_hcall_norets(H_SET_DABR, dabr); 531 } 532 533 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) 534 { 535 /* Have to set at least one bit in the DABRX according to PAPR */ 536 if (dabrx == 0 && dabr == 0) 537 dabrx = DABRX_USER; 538 /* PAPR says we can only set kernel and user bits */ 539 dabrx &= DABRX_KERNEL | DABRX_USER; 540 541 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); 542 } 543 544 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) 545 { 546 /* PAPR says we can't set HYP */ 547 dawrx &= ~DAWRX_HYP; 548 549 return plapr_set_watchpoint0(dawr, dawrx); 550 } 551 552 #define CMO_CHARACTERISTICS_TOKEN 44 553 #define CMO_MAXLENGTH 1026 554 555 void pSeries_coalesce_init(void) 556 { 557 struct hvcall_mpp_x_data mpp_x_data; 558 559 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 560 powerpc_firmware_features |= FW_FEATURE_XCMO; 561 else 562 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 563 } 564 565 /** 566 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 567 * handle that here. (Stolen from parse_system_parameter_string) 568 */ 569 static void pSeries_cmo_feature_init(void) 570 { 571 char *ptr, *key, *value, *end; 572 int call_status; 573 int page_order = IOMMU_PAGE_SHIFT_4K; 574 575 pr_debug(" -> fw_cmo_feature_init()\n"); 576 spin_lock(&rtas_data_buf_lock); 577 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 578 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 579 NULL, 580 CMO_CHARACTERISTICS_TOKEN, 581 __pa(rtas_data_buf), 582 RTAS_DATA_BUF_SIZE); 583 584 if (call_status != 0) { 585 spin_unlock(&rtas_data_buf_lock); 586 pr_debug("CMO not available\n"); 587 pr_debug(" <- fw_cmo_feature_init()\n"); 588 return; 589 } 590 591 end = rtas_data_buf + CMO_MAXLENGTH - 2; 592 ptr = rtas_data_buf + 2; /* step over strlen value */ 593 key = value = ptr; 594 595 while (*ptr && (ptr <= end)) { 596 /* Separate the key and value by replacing '=' with '\0' and 597 * point the value at the string after the '=' 598 */ 599 if (ptr[0] == '=') { 600 ptr[0] = '\0'; 601 value = ptr + 1; 602 } else if (ptr[0] == '\0' || ptr[0] == ',') { 603 /* Terminate the string containing the key/value pair */ 604 ptr[0] = '\0'; 605 606 if (key == value) { 607 pr_debug("Malformed key/value pair\n"); 608 /* Never found a '=', end processing */ 609 break; 610 } 611 612 if (0 == strcmp(key, "CMOPageSize")) 613 page_order = simple_strtol(value, NULL, 10); 614 else if (0 == strcmp(key, "PrPSP")) 615 CMO_PrPSP = simple_strtol(value, NULL, 10); 616 else if (0 == strcmp(key, "SecPSP")) 617 CMO_SecPSP = simple_strtol(value, NULL, 10); 618 value = key = ptr + 1; 619 } 620 ptr++; 621 } 622 623 /* Page size is returned as the power of 2 of the page size, 624 * convert to the page size in bytes before returning 625 */ 626 CMO_PageSize = 1 << page_order; 627 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 628 629 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 630 pr_info("CMO enabled\n"); 631 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 632 CMO_SecPSP); 633 powerpc_firmware_features |= FW_FEATURE_CMO; 634 pSeries_coalesce_init(); 635 } else 636 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 637 CMO_SecPSP); 638 spin_unlock(&rtas_data_buf_lock); 639 pr_debug(" <- fw_cmo_feature_init()\n"); 640 } 641 642 /* 643 * Early initialization. Relocation is on but do not reference unbolted pages 644 */ 645 static void __init pSeries_init_early(void) 646 { 647 pr_debug(" -> pSeries_init_early()\n"); 648 649 #ifdef CONFIG_HVC_CONSOLE 650 if (firmware_has_feature(FW_FEATURE_LPAR)) 651 hvc_vio_init_early(); 652 #endif 653 if (firmware_has_feature(FW_FEATURE_XDABR)) 654 ppc_md.set_dabr = pseries_set_xdabr; 655 else if (firmware_has_feature(FW_FEATURE_DABR)) 656 ppc_md.set_dabr = pseries_set_dabr; 657 658 if (firmware_has_feature(FW_FEATURE_SET_MODE)) 659 ppc_md.set_dawr = pseries_set_dawr; 660 661 pSeries_cmo_feature_init(); 662 iommu_init_early_pSeries(); 663 664 pr_debug(" <- pSeries_init_early()\n"); 665 } 666 667 /** 668 * pseries_power_off - tell firmware about how to power off the system. 669 * 670 * This function calls either the power-off rtas token in normal cases 671 * or the ibm,power-off-ups token (if present & requested) in case of 672 * a power failure. If power-off token is used, power on will only be 673 * possible with power button press. If ibm,power-off-ups token is used 674 * it will allow auto poweron after power is restored. 675 */ 676 static void pseries_power_off(void) 677 { 678 int rc; 679 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 680 681 if (rtas_flash_term_hook) 682 rtas_flash_term_hook(SYS_POWER_OFF); 683 684 if (rtas_poweron_auto == 0 || 685 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 686 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 687 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 688 } else { 689 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 690 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 691 } 692 for (;;); 693 } 694 695 /* 696 * Called very early, MMU is off, device-tree isn't unflattened 697 */ 698 699 static int __init pseries_probe_fw_features(unsigned long node, 700 const char *uname, int depth, 701 void *data) 702 { 703 const char *prop; 704 int len; 705 static int hypertas_found; 706 static int vec5_found; 707 708 if (depth != 1) 709 return 0; 710 711 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 712 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 713 &len); 714 if (prop) { 715 powerpc_firmware_features |= FW_FEATURE_LPAR; 716 fw_hypertas_feature_init(prop, len); 717 } 718 719 hypertas_found = 1; 720 } 721 722 if (!strcmp(uname, "chosen")) { 723 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 724 &len); 725 if (prop) 726 fw_vec5_feature_init(prop, len); 727 728 vec5_found = 1; 729 } 730 731 return hypertas_found && vec5_found; 732 } 733 734 static int __init pSeries_probe(void) 735 { 736 unsigned long root = of_get_flat_dt_root(); 737 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 738 739 if (dtype == NULL) 740 return 0; 741 if (strcmp(dtype, "chrp")) 742 return 0; 743 744 /* Cell blades firmware claims to be chrp while it's not. Until this 745 * is fixed, we need to avoid those here. 746 */ 747 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 748 of_flat_dt_is_compatible(root, "IBM,CBEA")) 749 return 0; 750 751 pr_debug("pSeries detected, looking for LPAR capability...\n"); 752 753 /* Now try to figure out if we are running on LPAR */ 754 of_scan_flat_dt(pseries_probe_fw_features, NULL); 755 756 #ifdef __LITTLE_ENDIAN__ 757 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 758 long rc; 759 /* 760 * Tell the hypervisor that we want our exceptions to 761 * be taken in little endian mode. If this fails we don't 762 * want to use BUG() because it will trigger an exception. 763 */ 764 rc = pseries_little_endian_exceptions(); 765 if (rc) { 766 ppc_md.progress("H_SET_MODE LE exception fail", 0); 767 panic("Could not enable little endian exceptions"); 768 } 769 } 770 #endif 771 772 if (firmware_has_feature(FW_FEATURE_LPAR)) 773 hpte_init_lpar(); 774 else 775 hpte_init_native(); 776 777 pm_power_off = pseries_power_off; 778 779 pr_debug("Machine is%s LPAR !\n", 780 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 781 782 return 1; 783 } 784 785 static int pSeries_pci_probe_mode(struct pci_bus *bus) 786 { 787 if (firmware_has_feature(FW_FEATURE_LPAR)) 788 return PCI_PROBE_DEVTREE; 789 return PCI_PROBE_NORMAL; 790 } 791 792 #ifndef CONFIG_PCI 793 void pSeries_final_fixup(void) { } 794 #endif 795 796 define_machine(pseries) { 797 .name = "pSeries", 798 .probe = pSeries_probe, 799 .setup_arch = pSeries_setup_arch, 800 .init_early = pSeries_init_early, 801 .show_cpuinfo = pSeries_show_cpuinfo, 802 .log_error = pSeries_log_error, 803 .pcibios_fixup = pSeries_final_fixup, 804 .pci_probe_mode = pSeries_pci_probe_mode, 805 .restart = rtas_restart, 806 .halt = rtas_halt, 807 .panic = rtas_os_term, 808 .get_boot_time = rtas_get_boot_time, 809 .get_rtc_time = rtas_get_rtc_time, 810 .set_rtc_time = rtas_set_rtc_time, 811 .calibrate_decr = generic_calibrate_decr, 812 .progress = rtas_progress, 813 .system_reset_exception = pSeries_system_reset_exception, 814 .machine_check_exception = pSeries_machine_check_exception, 815 #ifdef CONFIG_KEXEC 816 .machine_kexec = pSeries_machine_kexec, 817 #endif 818 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 819 .memory_block_size = pseries_memory_block_size, 820 #endif 821 }; 822