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/cpuidle.h> 43 44 #include <asm/mmu.h> 45 #include <asm/processor.h> 46 #include <asm/io.h> 47 #include <asm/pgtable.h> 48 #include <asm/prom.h> 49 #include <asm/rtas.h> 50 #include <asm/pci-bridge.h> 51 #include <asm/iommu.h> 52 #include <asm/dma.h> 53 #include <asm/machdep.h> 54 #include <asm/irq.h> 55 #include <asm/time.h> 56 #include <asm/nvram.h> 57 #include <asm/pmc.h> 58 #include <asm/mpic.h> 59 #include <asm/xics.h> 60 #include <asm/ppc-pci.h> 61 #include <asm/i8259.h> 62 #include <asm/udbg.h> 63 #include <asm/smp.h> 64 #include <asm/firmware.h> 65 #include <asm/eeh.h> 66 #include <asm/pSeries_reconfig.h> 67 68 #include "plpar_wrappers.h" 69 #include "pseries.h" 70 71 int CMO_PrPSP = -1; 72 int CMO_SecPSP = -1; 73 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); 74 EXPORT_SYMBOL(CMO_PageSize); 75 76 int fwnmi_active; /* TRUE if an FWNMI handler is present */ 77 78 static struct device_node *pSeries_mpic_node; 79 80 static void pSeries_show_cpuinfo(struct seq_file *m) 81 { 82 struct device_node *root; 83 const char *model = ""; 84 85 root = of_find_node_by_path("/"); 86 if (root) 87 model = of_get_property(root, "model", NULL); 88 seq_printf(m, "machine\t\t: CHRP %s\n", model); 89 of_node_put(root); 90 } 91 92 /* Initialize firmware assisted non-maskable interrupts if 93 * the firmware supports this feature. 94 */ 95 static void __init fwnmi_init(void) 96 { 97 unsigned long system_reset_addr, machine_check_addr; 98 99 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 100 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 101 return; 102 103 /* If the kernel's not linked at zero we point the firmware at low 104 * addresses anyway, and use a trampoline to get to the real code. */ 105 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 106 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 107 108 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 109 machine_check_addr)) 110 fwnmi_active = 1; 111 } 112 113 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 114 { 115 struct irq_chip *chip = irq_desc_get_chip(desc); 116 unsigned int cascade_irq = i8259_irq(); 117 118 if (cascade_irq != NO_IRQ) 119 generic_handle_irq(cascade_irq); 120 121 chip->irq_eoi(&desc->irq_data); 122 } 123 124 static void __init pseries_setup_i8259_cascade(void) 125 { 126 struct device_node *np, *old, *found = NULL; 127 unsigned int cascade; 128 const u32 *addrp; 129 unsigned long intack = 0; 130 int naddr; 131 132 for_each_node_by_type(np, "interrupt-controller") { 133 if (of_device_is_compatible(np, "chrp,iic")) { 134 found = np; 135 break; 136 } 137 } 138 139 if (found == NULL) { 140 printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); 141 return; 142 } 143 144 cascade = irq_of_parse_and_map(found, 0); 145 if (cascade == NO_IRQ) { 146 printk(KERN_ERR "pic: failed to map cascade interrupt"); 147 return; 148 } 149 pr_debug("pic: cascade mapped to irq %d\n", cascade); 150 151 for (old = of_node_get(found); old != NULL ; old = np) { 152 np = of_get_parent(old); 153 of_node_put(old); 154 if (np == NULL) 155 break; 156 if (strcmp(np->name, "pci") != 0) 157 continue; 158 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); 159 if (addrp == NULL) 160 continue; 161 naddr = of_n_addr_cells(np); 162 intack = addrp[naddr-1]; 163 if (naddr > 1) 164 intack |= ((unsigned long)addrp[naddr-2]) << 32; 165 } 166 if (intack) 167 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); 168 i8259_init(found, intack); 169 of_node_put(found); 170 irq_set_chained_handler(cascade, pseries_8259_cascade); 171 } 172 173 static void __init pseries_mpic_init_IRQ(void) 174 { 175 struct device_node *np; 176 const unsigned int *opprop; 177 unsigned long openpic_addr = 0; 178 int naddr, n, i, opplen; 179 struct mpic *mpic; 180 181 np = of_find_node_by_path("/"); 182 naddr = of_n_addr_cells(np); 183 opprop = of_get_property(np, "platform-open-pic", &opplen); 184 if (opprop != 0) { 185 openpic_addr = of_read_number(opprop, naddr); 186 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); 187 } 188 of_node_put(np); 189 190 BUG_ON(openpic_addr == 0); 191 192 /* Setup the openpic driver */ 193 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, 194 MPIC_NO_RESET, 16, 0, " MPIC "); 195 BUG_ON(mpic == NULL); 196 197 /* Add ISUs */ 198 opplen /= sizeof(u32); 199 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 200 unsigned long isuaddr = of_read_number(opprop + i, naddr); 201 mpic_assign_isu(mpic, n, isuaddr); 202 } 203 204 /* Setup top-level get_irq */ 205 ppc_md.get_irq = mpic_get_irq; 206 207 /* All ISUs are setup, complete initialization */ 208 mpic_init(mpic); 209 210 /* Look for cascade */ 211 pseries_setup_i8259_cascade(); 212 } 213 214 static void __init pseries_xics_init_IRQ(void) 215 { 216 xics_init(); 217 pseries_setup_i8259_cascade(); 218 } 219 220 static void pseries_lpar_enable_pmcs(void) 221 { 222 unsigned long set, reset; 223 224 set = 1UL << 63; 225 reset = 0; 226 plpar_hcall_norets(H_PERFMON, set, reset); 227 } 228 229 static void __init pseries_discover_pic(void) 230 { 231 struct device_node *np; 232 const char *typep; 233 234 for (np = NULL; (np = of_find_node_by_name(np, 235 "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 PSERIES_RECONFIG_ADD: 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 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 = 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 */ 335 static inline int alloc_dispatch_logs(void) 336 { 337 return 0; 338 } 339 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */ 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 early_initcall(alloc_dispatch_log_kmem_cache); 354 355 static void pSeries_idle(void) 356 { 357 /* This would call on the cpuidle framework, and the back-end pseries 358 * driver to go to idle states 359 */ 360 if (cpuidle_idle_call()) { 361 /* On error, execute default handler 362 * to go into low thread priority and possibly 363 * low power mode. 364 */ 365 HMT_low(); 366 HMT_very_low(); 367 } 368 } 369 370 static void __init pSeries_setup_arch(void) 371 { 372 panic_timeout = 10; 373 374 /* Discover PIC type and setup ppc_md accordingly */ 375 pseries_discover_pic(); 376 377 /* openpic global configuration register (64-bit format). */ 378 /* openpic Interrupt Source Unit pointer (64-bit format). */ 379 /* python0 facility area (mmio) (64-bit format) REAL address. */ 380 381 /* init to some ~sane value until calibrate_delay() runs */ 382 loops_per_jiffy = 50000000; 383 384 fwnmi_init(); 385 386 /* By default, only probe PCI (can be overriden by rtas_pci) */ 387 pci_add_flags(PCI_PROBE_ONLY); 388 389 /* Find and initialize PCI host bridges */ 390 init_pci_config_tokens(); 391 eeh_pseries_init(); 392 find_and_init_phbs(); 393 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); 394 eeh_init(); 395 396 pSeries_nvram_init(); 397 398 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 399 vpa_init(boot_cpuid); 400 ppc_md.power_save = pSeries_idle; 401 } 402 403 if (firmware_has_feature(FW_FEATURE_LPAR)) 404 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 405 else 406 ppc_md.enable_pmcs = power4_enable_pmcs; 407 } 408 409 static int __init pSeries_init_panel(void) 410 { 411 /* Manually leave the kernel version on the panel. */ 412 ppc_md.progress("Linux ppc64\n", 0); 413 ppc_md.progress(init_utsname()->version, 0); 414 415 return 0; 416 } 417 machine_arch_initcall(pseries, pSeries_init_panel); 418 419 static int pseries_set_dabr(unsigned long dabr) 420 { 421 return plpar_hcall_norets(H_SET_DABR, dabr); 422 } 423 424 static int pseries_set_xdabr(unsigned long dabr) 425 { 426 /* We want to catch accesses from kernel and userspace */ 427 return plpar_hcall_norets(H_SET_XDABR, dabr, 428 H_DABRX_KERNEL | H_DABRX_USER); 429 } 430 431 #define CMO_CHARACTERISTICS_TOKEN 44 432 #define CMO_MAXLENGTH 1026 433 434 void pSeries_coalesce_init(void) 435 { 436 struct hvcall_mpp_x_data mpp_x_data; 437 438 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) 439 powerpc_firmware_features |= FW_FEATURE_XCMO; 440 else 441 powerpc_firmware_features &= ~FW_FEATURE_XCMO; 442 } 443 444 /** 445 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 446 * handle that here. (Stolen from parse_system_parameter_string) 447 */ 448 void pSeries_cmo_feature_init(void) 449 { 450 char *ptr, *key, *value, *end; 451 int call_status; 452 int page_order = IOMMU_PAGE_SHIFT; 453 454 pr_debug(" -> fw_cmo_feature_init()\n"); 455 spin_lock(&rtas_data_buf_lock); 456 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 457 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 458 NULL, 459 CMO_CHARACTERISTICS_TOKEN, 460 __pa(rtas_data_buf), 461 RTAS_DATA_BUF_SIZE); 462 463 if (call_status != 0) { 464 spin_unlock(&rtas_data_buf_lock); 465 pr_debug("CMO not available\n"); 466 pr_debug(" <- fw_cmo_feature_init()\n"); 467 return; 468 } 469 470 end = rtas_data_buf + CMO_MAXLENGTH - 2; 471 ptr = rtas_data_buf + 2; /* step over strlen value */ 472 key = value = ptr; 473 474 while (*ptr && (ptr <= end)) { 475 /* Separate the key and value by replacing '=' with '\0' and 476 * point the value at the string after the '=' 477 */ 478 if (ptr[0] == '=') { 479 ptr[0] = '\0'; 480 value = ptr + 1; 481 } else if (ptr[0] == '\0' || ptr[0] == ',') { 482 /* Terminate the string containing the key/value pair */ 483 ptr[0] = '\0'; 484 485 if (key == value) { 486 pr_debug("Malformed key/value pair\n"); 487 /* Never found a '=', end processing */ 488 break; 489 } 490 491 if (0 == strcmp(key, "CMOPageSize")) 492 page_order = simple_strtol(value, NULL, 10); 493 else if (0 == strcmp(key, "PrPSP")) 494 CMO_PrPSP = simple_strtol(value, NULL, 10); 495 else if (0 == strcmp(key, "SecPSP")) 496 CMO_SecPSP = simple_strtol(value, NULL, 10); 497 value = key = ptr + 1; 498 } 499 ptr++; 500 } 501 502 /* Page size is returned as the power of 2 of the page size, 503 * convert to the page size in bytes before returning 504 */ 505 CMO_PageSize = 1 << page_order; 506 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 507 508 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 509 pr_info("CMO enabled\n"); 510 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 511 CMO_SecPSP); 512 powerpc_firmware_features |= FW_FEATURE_CMO; 513 pSeries_coalesce_init(); 514 } else 515 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 516 CMO_SecPSP); 517 spin_unlock(&rtas_data_buf_lock); 518 pr_debug(" <- fw_cmo_feature_init()\n"); 519 } 520 521 /* 522 * Early initialization. Relocation is on but do not reference unbolted pages 523 */ 524 static void __init pSeries_init_early(void) 525 { 526 pr_debug(" -> pSeries_init_early()\n"); 527 528 #ifdef CONFIG_HVC_CONSOLE 529 if (firmware_has_feature(FW_FEATURE_LPAR)) 530 hvc_vio_init_early(); 531 #endif 532 if (firmware_has_feature(FW_FEATURE_DABR)) 533 ppc_md.set_dabr = pseries_set_dabr; 534 else if (firmware_has_feature(FW_FEATURE_XDABR)) 535 ppc_md.set_dabr = pseries_set_xdabr; 536 537 pSeries_cmo_feature_init(); 538 iommu_init_early_pSeries(); 539 540 pr_debug(" <- pSeries_init_early()\n"); 541 } 542 543 /* 544 * Called very early, MMU is off, device-tree isn't unflattened 545 */ 546 547 static int __init pSeries_probe_hypertas(unsigned long node, 548 const char *uname, int depth, 549 void *data) 550 { 551 const char *hypertas; 552 unsigned long len; 553 554 if (depth != 1 || 555 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 556 return 0; 557 558 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); 559 if (!hypertas) 560 return 1; 561 562 powerpc_firmware_features |= FW_FEATURE_LPAR; 563 fw_feature_init(hypertas, len); 564 565 return 1; 566 } 567 568 static int __init pSeries_probe(void) 569 { 570 unsigned long root = of_get_flat_dt_root(); 571 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 572 573 if (dtype == NULL) 574 return 0; 575 if (strcmp(dtype, "chrp")) 576 return 0; 577 578 /* Cell blades firmware claims to be chrp while it's not. Until this 579 * is fixed, we need to avoid those here. 580 */ 581 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 582 of_flat_dt_is_compatible(root, "IBM,CBEA")) 583 return 0; 584 585 pr_debug("pSeries detected, looking for LPAR capability...\n"); 586 587 /* Now try to figure out if we are running on LPAR */ 588 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 589 590 if (firmware_has_feature(FW_FEATURE_LPAR)) 591 hpte_init_lpar(); 592 else 593 hpte_init_native(); 594 595 pr_debug("Machine is%s LPAR !\n", 596 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 597 598 return 1; 599 } 600 601 static int pSeries_pci_probe_mode(struct pci_bus *bus) 602 { 603 if (firmware_has_feature(FW_FEATURE_LPAR)) 604 return PCI_PROBE_DEVTREE; 605 return PCI_PROBE_NORMAL; 606 } 607 608 /** 609 * pSeries_power_off - tell firmware about how to power off the system. 610 * 611 * This function calls either the power-off rtas token in normal cases 612 * or the ibm,power-off-ups token (if present & requested) in case of 613 * a power failure. If power-off token is used, power on will only be 614 * possible with power button press. If ibm,power-off-ups token is used 615 * it will allow auto poweron after power is restored. 616 */ 617 static void pSeries_power_off(void) 618 { 619 int rc; 620 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 621 622 if (rtas_flash_term_hook) 623 rtas_flash_term_hook(SYS_POWER_OFF); 624 625 if (rtas_poweron_auto == 0 || 626 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 627 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 628 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 629 } else { 630 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 631 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 632 } 633 for (;;); 634 } 635 636 #ifndef CONFIG_PCI 637 void pSeries_final_fixup(void) { } 638 #endif 639 640 define_machine(pseries) { 641 .name = "pSeries", 642 .probe = pSeries_probe, 643 .setup_arch = pSeries_setup_arch, 644 .init_early = pSeries_init_early, 645 .show_cpuinfo = pSeries_show_cpuinfo, 646 .log_error = pSeries_log_error, 647 .pcibios_fixup = pSeries_final_fixup, 648 .pci_probe_mode = pSeries_pci_probe_mode, 649 .restart = rtas_restart, 650 .power_off = pSeries_power_off, 651 .halt = rtas_halt, 652 .panic = rtas_os_term, 653 .get_boot_time = rtas_get_boot_time, 654 .get_rtc_time = rtas_get_rtc_time, 655 .set_rtc_time = rtas_set_rtc_time, 656 .calibrate_decr = generic_calibrate_decr, 657 .progress = rtas_progress, 658 .system_reset_exception = pSeries_system_reset_exception, 659 .machine_check_exception = pSeries_machine_check_exception, 660 }; 661