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/slab.h> 27 #include <linux/user.h> 28 #include <linux/tty.h> 29 #include <linux/major.h> 30 #include <linux/interrupt.h> 31 #include <linux/reboot.h> 32 #include <linux/init.h> 33 #include <linux/ioport.h> 34 #include <linux/console.h> 35 #include <linux/pci.h> 36 #include <linux/utsname.h> 37 #include <linux/adb.h> 38 #include <linux/module.h> 39 #include <linux/delay.h> 40 #include <linux/irq.h> 41 #include <linux/seq_file.h> 42 #include <linux/root_dev.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 "xics.h" 58 #include <asm/pmc.h> 59 #include <asm/mpic.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 void pseries_shared_idle_sleep(void); 79 static void pseries_dedicated_idle_sleep(void); 80 81 static struct device_node *pSeries_mpic_node; 82 83 static void pSeries_show_cpuinfo(struct seq_file *m) 84 { 85 struct device_node *root; 86 const char *model = ""; 87 88 root = of_find_node_by_path("/"); 89 if (root) 90 model = of_get_property(root, "model", NULL); 91 seq_printf(m, "machine\t\t: CHRP %s\n", model); 92 of_node_put(root); 93 } 94 95 /* Initialize firmware assisted non-maskable interrupts if 96 * the firmware supports this feature. 97 */ 98 static void __init fwnmi_init(void) 99 { 100 unsigned long system_reset_addr, machine_check_addr; 101 102 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 103 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 104 return; 105 106 /* If the kernel's not linked at zero we point the firmware at low 107 * addresses anyway, and use a trampoline to get to the real code. */ 108 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 109 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 110 111 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 112 machine_check_addr)) 113 fwnmi_active = 1; 114 } 115 116 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 117 { 118 unsigned int cascade_irq = i8259_irq(); 119 if (cascade_irq != NO_IRQ) 120 generic_handle_irq(cascade_irq); 121 desc->chip->eoi(irq); 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 set_irq_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_PRIMARY, 195 16, 250, /* isu size, irq count */ 196 " MPIC "); 197 BUG_ON(mpic == NULL); 198 199 /* Add ISUs */ 200 opplen /= sizeof(u32); 201 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 202 unsigned long isuaddr = of_read_number(opprop + i, naddr); 203 mpic_assign_isu(mpic, n, isuaddr); 204 } 205 206 /* All ISUs are setup, complete initialization */ 207 mpic_init(mpic); 208 209 /* Look for cascade */ 210 pseries_setup_i8259_cascade(); 211 } 212 213 static void __init pseries_xics_init_IRQ(void) 214 { 215 xics_init_IRQ(); 216 pseries_setup_i8259_cascade(); 217 } 218 219 static void pseries_lpar_enable_pmcs(void) 220 { 221 unsigned long set, reset; 222 223 set = 1UL << 63; 224 reset = 0; 225 plpar_hcall_norets(H_PERFMON, set, reset); 226 227 /* instruct hypervisor to maintain PMCs */ 228 if (firmware_has_feature(FW_FEATURE_SPLPAR)) 229 get_lppaca()->pmcregs_in_use = 1; 230 } 231 232 static void __init pseries_discover_pic(void) 233 { 234 struct device_node *np; 235 const char *typep; 236 237 for (np = NULL; (np = of_find_node_by_name(np, 238 "interrupt-controller"));) { 239 typep = of_get_property(np, "compatible", NULL); 240 if (strstr(typep, "open-pic")) { 241 pSeries_mpic_node = of_node_get(np); 242 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 243 ppc_md.get_irq = mpic_get_irq; 244 setup_kexec_cpu_down_mpic(); 245 smp_init_pseries_mpic(); 246 return; 247 } else if (strstr(typep, "ppc-xicp")) { 248 ppc_md.init_IRQ = pseries_xics_init_IRQ; 249 setup_kexec_cpu_down_xics(); 250 smp_init_pseries_xics(); 251 return; 252 } 253 } 254 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 255 " interrupt-controller\n"); 256 } 257 258 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) 259 { 260 struct device_node *np = node; 261 struct pci_dn *pci = NULL; 262 int err = NOTIFY_OK; 263 264 switch (action) { 265 case PSERIES_RECONFIG_ADD: 266 pci = np->parent->data; 267 if (pci) 268 update_dn_pci_info(np, pci->phb); 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 static void __init pSeries_setup_arch(void) 282 { 283 /* Discover PIC type and setup ppc_md accordingly */ 284 pseries_discover_pic(); 285 286 /* openpic global configuration register (64-bit format). */ 287 /* openpic Interrupt Source Unit pointer (64-bit format). */ 288 /* python0 facility area (mmio) (64-bit format) REAL address. */ 289 290 /* init to some ~sane value until calibrate_delay() runs */ 291 loops_per_jiffy = 50000000; 292 293 fwnmi_init(); 294 295 /* Find and initialize PCI host bridges */ 296 init_pci_config_tokens(); 297 find_and_init_phbs(); 298 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); 299 eeh_init(); 300 301 pSeries_nvram_init(); 302 303 /* Choose an idle loop */ 304 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 305 vpa_init(boot_cpuid); 306 if (get_lppaca()->shared_proc) { 307 printk(KERN_DEBUG "Using shared processor idle loop\n"); 308 ppc_md.power_save = pseries_shared_idle_sleep; 309 } else { 310 printk(KERN_DEBUG "Using dedicated idle loop\n"); 311 ppc_md.power_save = pseries_dedicated_idle_sleep; 312 } 313 } else { 314 printk(KERN_DEBUG "Using default idle loop\n"); 315 } 316 317 if (firmware_has_feature(FW_FEATURE_LPAR)) 318 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 319 else 320 ppc_md.enable_pmcs = power4_enable_pmcs; 321 } 322 323 static int __init pSeries_init_panel(void) 324 { 325 /* Manually leave the kernel version on the panel. */ 326 ppc_md.progress("Linux ppc64\n", 0); 327 ppc_md.progress(init_utsname()->version, 0); 328 329 return 0; 330 } 331 arch_initcall(pSeries_init_panel); 332 333 static int pseries_set_dabr(unsigned long dabr) 334 { 335 return plpar_hcall_norets(H_SET_DABR, dabr); 336 } 337 338 static int pseries_set_xdabr(unsigned long dabr) 339 { 340 /* We want to catch accesses from kernel and userspace */ 341 return plpar_hcall_norets(H_SET_XDABR, dabr, 342 H_DABRX_KERNEL | H_DABRX_USER); 343 } 344 345 #define CMO_CHARACTERISTICS_TOKEN 44 346 #define CMO_MAXLENGTH 1026 347 348 /** 349 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 350 * handle that here. (Stolen from parse_system_parameter_string) 351 */ 352 void pSeries_cmo_feature_init(void) 353 { 354 char *ptr, *key, *value, *end; 355 int call_status; 356 int page_order = IOMMU_PAGE_SHIFT; 357 358 pr_debug(" -> fw_cmo_feature_init()\n"); 359 spin_lock(&rtas_data_buf_lock); 360 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 361 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 362 NULL, 363 CMO_CHARACTERISTICS_TOKEN, 364 __pa(rtas_data_buf), 365 RTAS_DATA_BUF_SIZE); 366 367 if (call_status != 0) { 368 spin_unlock(&rtas_data_buf_lock); 369 pr_debug("CMO not available\n"); 370 pr_debug(" <- fw_cmo_feature_init()\n"); 371 return; 372 } 373 374 end = rtas_data_buf + CMO_MAXLENGTH - 2; 375 ptr = rtas_data_buf + 2; /* step over strlen value */ 376 key = value = ptr; 377 378 while (*ptr && (ptr <= end)) { 379 /* Separate the key and value by replacing '=' with '\0' and 380 * point the value at the string after the '=' 381 */ 382 if (ptr[0] == '=') { 383 ptr[0] = '\0'; 384 value = ptr + 1; 385 } else if (ptr[0] == '\0' || ptr[0] == ',') { 386 /* Terminate the string containing the key/value pair */ 387 ptr[0] = '\0'; 388 389 if (key == value) { 390 pr_debug("Malformed key/value pair\n"); 391 /* Never found a '=', end processing */ 392 break; 393 } 394 395 if (0 == strcmp(key, "CMOPageSize")) 396 page_order = simple_strtol(value, NULL, 10); 397 else if (0 == strcmp(key, "PrPSP")) 398 CMO_PrPSP = simple_strtol(value, NULL, 10); 399 else if (0 == strcmp(key, "SecPSP")) 400 CMO_SecPSP = simple_strtol(value, NULL, 10); 401 value = key = ptr + 1; 402 } 403 ptr++; 404 } 405 406 /* Page size is returned as the power of 2 of the page size, 407 * convert to the page size in bytes before returning 408 */ 409 CMO_PageSize = 1 << page_order; 410 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 411 412 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 413 pr_info("CMO enabled\n"); 414 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 415 CMO_SecPSP); 416 powerpc_firmware_features |= FW_FEATURE_CMO; 417 } else 418 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 419 CMO_SecPSP); 420 spin_unlock(&rtas_data_buf_lock); 421 pr_debug(" <- fw_cmo_feature_init()\n"); 422 } 423 424 /* 425 * Early initialization. Relocation is on but do not reference unbolted pages 426 */ 427 static void __init pSeries_init_early(void) 428 { 429 pr_debug(" -> pSeries_init_early()\n"); 430 431 if (firmware_has_feature(FW_FEATURE_LPAR)) 432 find_udbg_vterm(); 433 434 if (firmware_has_feature(FW_FEATURE_DABR)) 435 ppc_md.set_dabr = pseries_set_dabr; 436 else if (firmware_has_feature(FW_FEATURE_XDABR)) 437 ppc_md.set_dabr = pseries_set_xdabr; 438 439 pSeries_cmo_feature_init(); 440 iommu_init_early_pSeries(); 441 442 pr_debug(" <- pSeries_init_early()\n"); 443 } 444 445 /* 446 * Called very early, MMU is off, device-tree isn't unflattened 447 */ 448 449 static int __init pSeries_probe_hypertas(unsigned long node, 450 const char *uname, int depth, 451 void *data) 452 { 453 const char *hypertas; 454 unsigned long len; 455 456 if (depth != 1 || 457 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 458 return 0; 459 460 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); 461 if (!hypertas) 462 return 1; 463 464 powerpc_firmware_features |= FW_FEATURE_LPAR; 465 fw_feature_init(hypertas, len); 466 467 return 1; 468 } 469 470 static int __init pSeries_probe(void) 471 { 472 unsigned long root = of_get_flat_dt_root(); 473 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 474 475 if (dtype == NULL) 476 return 0; 477 if (strcmp(dtype, "chrp")) 478 return 0; 479 480 /* Cell blades firmware claims to be chrp while it's not. Until this 481 * is fixed, we need to avoid those here. 482 */ 483 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 484 of_flat_dt_is_compatible(root, "IBM,CBEA")) 485 return 0; 486 487 pr_debug("pSeries detected, looking for LPAR capability...\n"); 488 489 /* Now try to figure out if we are running on LPAR */ 490 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 491 492 if (firmware_has_feature(FW_FEATURE_LPAR)) 493 hpte_init_lpar(); 494 else 495 hpte_init_native(); 496 497 pr_debug("Machine is%s LPAR !\n", 498 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 499 500 return 1; 501 } 502 503 504 DECLARE_PER_CPU(unsigned long, smt_snooze_delay); 505 506 static void pseries_dedicated_idle_sleep(void) 507 { 508 unsigned int cpu = smp_processor_id(); 509 unsigned long start_snooze; 510 unsigned long in_purr, out_purr; 511 512 /* 513 * Indicate to the HV that we are idle. Now would be 514 * a good time to find other work to dispatch. 515 */ 516 get_lppaca()->idle = 1; 517 get_lppaca()->donate_dedicated_cpu = 1; 518 in_purr = mfspr(SPRN_PURR); 519 520 /* 521 * We come in with interrupts disabled, and need_resched() 522 * has been checked recently. If we should poll for a little 523 * while, do so. 524 */ 525 if (__get_cpu_var(smt_snooze_delay)) { 526 start_snooze = get_tb() + 527 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec; 528 local_irq_enable(); 529 set_thread_flag(TIF_POLLING_NRFLAG); 530 531 while (get_tb() < start_snooze) { 532 if (need_resched() || cpu_is_offline(cpu)) 533 goto out; 534 ppc64_runlatch_off(); 535 HMT_low(); 536 HMT_very_low(); 537 } 538 539 HMT_medium(); 540 clear_thread_flag(TIF_POLLING_NRFLAG); 541 smp_mb(); 542 local_irq_disable(); 543 if (need_resched() || cpu_is_offline(cpu)) 544 goto out; 545 } 546 547 cede_processor(); 548 549 out: 550 HMT_medium(); 551 out_purr = mfspr(SPRN_PURR); 552 get_lppaca()->wait_state_cycles += out_purr - in_purr; 553 get_lppaca()->donate_dedicated_cpu = 0; 554 get_lppaca()->idle = 0; 555 } 556 557 static void pseries_shared_idle_sleep(void) 558 { 559 /* 560 * Indicate to the HV that we are idle. Now would be 561 * a good time to find other work to dispatch. 562 */ 563 get_lppaca()->idle = 1; 564 565 /* 566 * Yield the processor to the hypervisor. We return if 567 * an external interrupt occurs (which are driven prior 568 * to returning here) or if a prod occurs from another 569 * processor. When returning here, external interrupts 570 * are enabled. 571 */ 572 cede_processor(); 573 574 get_lppaca()->idle = 0; 575 } 576 577 static int pSeries_pci_probe_mode(struct pci_bus *bus) 578 { 579 if (firmware_has_feature(FW_FEATURE_LPAR)) 580 return PCI_PROBE_DEVTREE; 581 return PCI_PROBE_NORMAL; 582 } 583 584 /** 585 * pSeries_power_off - tell firmware about how to power off the system. 586 * 587 * This function calls either the power-off rtas token in normal cases 588 * or the ibm,power-off-ups token (if present & requested) in case of 589 * a power failure. If power-off token is used, power on will only be 590 * possible with power button press. If ibm,power-off-ups token is used 591 * it will allow auto poweron after power is restored. 592 */ 593 static void pSeries_power_off(void) 594 { 595 int rc; 596 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 597 598 if (rtas_flash_term_hook) 599 rtas_flash_term_hook(SYS_POWER_OFF); 600 601 if (rtas_poweron_auto == 0 || 602 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 603 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 604 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 605 } else { 606 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 607 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 608 } 609 for (;;); 610 } 611 612 #ifndef CONFIG_PCI 613 void pSeries_final_fixup(void) { } 614 #endif 615 616 define_machine(pseries) { 617 .name = "pSeries", 618 .probe = pSeries_probe, 619 .setup_arch = pSeries_setup_arch, 620 .init_early = pSeries_init_early, 621 .show_cpuinfo = pSeries_show_cpuinfo, 622 .log_error = pSeries_log_error, 623 .pcibios_fixup = pSeries_final_fixup, 624 .pci_probe_mode = pSeries_pci_probe_mode, 625 .restart = rtas_restart, 626 .power_off = pSeries_power_off, 627 .halt = rtas_halt, 628 .panic = rtas_os_term, 629 .get_boot_time = rtas_get_boot_time, 630 .get_rtc_time = rtas_get_rtc_time, 631 .set_rtc_time = rtas_set_rtc_time, 632 .calibrate_decr = generic_calibrate_decr, 633 .progress = rtas_progress, 634 .system_reset_exception = pSeries_system_reset_exception, 635 .machine_check_exception = pSeries_machine_check_exception, 636 }; 637