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/module.h> 38#include <linux/delay.h> 39#include <linux/irq.h> 40#include <linux/seq_file.h> 41#include <linux/root_dev.h> 42 43#include <asm/mmu.h> 44#include <asm/processor.h> 45#include <asm/io.h> 46#include <asm/pgtable.h> 47#include <asm/prom.h> 48#include <asm/rtas.h> 49#include <asm/pci-bridge.h> 50#include <asm/iommu.h> 51#include <asm/dma.h> 52#include <asm/machdep.h> 53#include <asm/irq.h> 54#include <asm/time.h> 55#include <asm/nvram.h> 56#include "xics.h" 57#include <asm/pmc.h> 58#include <asm/mpic.h> 59#include <asm/ppc-pci.h> 60#include <asm/i8259.h> 61#include <asm/udbg.h> 62#include <asm/smp.h> 63#include <asm/firmware.h> 64#include <asm/eeh.h> 65#include <asm/pSeries_reconfig.h> 66 67#include "plpar_wrappers.h" 68#include "pseries.h" 69 70int CMO_PrPSP = -1; 71int CMO_SecPSP = -1; 72unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); 73EXPORT_SYMBOL(CMO_PageSize); 74 75int fwnmi_active; /* TRUE if an FWNMI handler is present */ 76 77static void pseries_shared_idle_sleep(void); 78static void pseries_dedicated_idle_sleep(void); 79 80static struct device_node *pSeries_mpic_node; 81 82static void pSeries_show_cpuinfo(struct seq_file *m) 83{ 84 struct device_node *root; 85 const char *model = ""; 86 87 root = of_find_node_by_path("/"); 88 if (root) 89 model = of_get_property(root, "model", NULL); 90 seq_printf(m, "machine\t\t: CHRP %s\n", model); 91 of_node_put(root); 92} 93 94/* Initialize firmware assisted non-maskable interrupts if 95 * the firmware supports this feature. 96 */ 97static void __init fwnmi_init(void) 98{ 99 unsigned long system_reset_addr, machine_check_addr; 100 101 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 102 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 103 return; 104 105 /* If the kernel's not linked at zero we point the firmware at low 106 * addresses anyway, and use a trampoline to get to the real code. */ 107 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 108 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 109 110 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 111 machine_check_addr)) 112 fwnmi_active = 1; 113} 114 115static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 116{ 117 unsigned int cascade_irq = i8259_irq(); 118 if (cascade_irq != NO_IRQ) 119 generic_handle_irq(cascade_irq); 120 desc->chip->eoi(irq); 121} 122 123static void __init pseries_setup_i8259_cascade(void) 124{ 125 struct device_node *np, *old, *found = NULL; 126 unsigned int cascade; 127 const u32 *addrp; 128 unsigned long intack = 0; 129 int naddr; 130 131 for_each_node_by_type(np, "interrupt-controller") { 132 if (of_device_is_compatible(np, "chrp,iic")) { 133 found = np; 134 break; 135 } 136 } 137 138 if (found == NULL) { 139 printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); 140 return; 141 } 142 143 cascade = irq_of_parse_and_map(found, 0); 144 if (cascade == NO_IRQ) { 145 printk(KERN_ERR "pic: failed to map cascade interrupt"); 146 return; 147 } 148 pr_debug("pic: cascade mapped to irq %d\n", cascade); 149 150 for (old = of_node_get(found); old != NULL ; old = np) { 151 np = of_get_parent(old); 152 of_node_put(old); 153 if (np == NULL) 154 break; 155 if (strcmp(np->name, "pci") != 0) 156 continue; 157 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); 158 if (addrp == NULL) 159 continue; 160 naddr = of_n_addr_cells(np); 161 intack = addrp[naddr-1]; 162 if (naddr > 1) 163 intack |= ((unsigned long)addrp[naddr-2]) << 32; 164 } 165 if (intack) 166 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); 167 i8259_init(found, intack); 168 of_node_put(found); 169 set_irq_chained_handler(cascade, pseries_8259_cascade); 170} 171 172static void __init pseries_mpic_init_IRQ(void) 173{ 174 struct device_node *np; 175 const unsigned int *opprop; 176 unsigned long openpic_addr = 0; 177 int naddr, n, i, opplen; 178 struct mpic *mpic; 179 180 np = of_find_node_by_path("/"); 181 naddr = of_n_addr_cells(np); 182 opprop = of_get_property(np, "platform-open-pic", &opplen); 183 if (opprop != 0) { 184 openpic_addr = of_read_number(opprop, naddr); 185 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); 186 } 187 of_node_put(np); 188 189 BUG_ON(openpic_addr == 0); 190 191 /* Setup the openpic driver */ 192 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, 193 MPIC_PRIMARY, 194 16, 250, /* isu size, irq count */ 195 " 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 /* All ISUs are setup, complete initialization */ 206 mpic_init(mpic); 207 208 /* Look for cascade */ 209 pseries_setup_i8259_cascade(); 210} 211 212static void __init pseries_xics_init_IRQ(void) 213{ 214 xics_init_IRQ(); 215 pseries_setup_i8259_cascade(); 216} 217 218static void pseries_lpar_enable_pmcs(void) 219{ 220 unsigned long set, reset; 221 222 set = 1UL << 63; 223 reset = 0; 224 plpar_hcall_norets(H_PERFMON, set, reset); 225} 226 227static void __init pseries_discover_pic(void) 228{ 229 struct device_node *np; 230 const char *typep; 231 232 for (np = NULL; (np = of_find_node_by_name(np, 233 "interrupt-controller"));) { 234 typep = of_get_property(np, "compatible", NULL); 235 if (strstr(typep, "open-pic")) { 236 pSeries_mpic_node = of_node_get(np); 237 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 238 ppc_md.get_irq = mpic_get_irq; 239 setup_kexec_cpu_down_mpic(); 240 smp_init_pseries_mpic(); 241 return; 242 } else if (strstr(typep, "ppc-xicp")) { 243 ppc_md.init_IRQ = pseries_xics_init_IRQ; 244 setup_kexec_cpu_down_xics(); 245 smp_init_pseries_xics(); 246 return; 247 } 248 } 249 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 250 " interrupt-controller\n"); 251} 252 253static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) 254{ 255 struct device_node *np = node; 256 struct pci_dn *pci = NULL; 257 int err = NOTIFY_OK; 258 259 switch (action) { 260 case PSERIES_RECONFIG_ADD: 261 pci = np->parent->data; 262 if (pci) 263 update_dn_pci_info(np, pci->phb); 264 break; 265 default: 266 err = NOTIFY_DONE; 267 break; 268 } 269 return err; 270} 271 272static struct notifier_block pci_dn_reconfig_nb = { 273 .notifier_call = pci_dn_reconfig_notifier, 274}; 275 276static void __init pSeries_setup_arch(void) 277{ 278 /* Discover PIC type and setup ppc_md accordingly */ 279 pseries_discover_pic(); 280 281 /* openpic global configuration register (64-bit format). */ 282 /* openpic Interrupt Source Unit pointer (64-bit format). */ 283 /* python0 facility area (mmio) (64-bit format) REAL address. */ 284 285 /* init to some ~sane value until calibrate_delay() runs */ 286 loops_per_jiffy = 50000000; 287 288 fwnmi_init(); 289 290 /* Find and initialize PCI host bridges */ 291 init_pci_config_tokens(); 292 find_and_init_phbs(); 293 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); 294 eeh_init(); 295 296 pSeries_nvram_init(); 297 298 /* Choose an idle loop */ 299 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 300 vpa_init(boot_cpuid); 301 if (get_lppaca()->shared_proc) { 302 printk(KERN_DEBUG "Using shared processor idle loop\n"); 303 ppc_md.power_save = pseries_shared_idle_sleep; 304 } else { 305 printk(KERN_DEBUG "Using dedicated idle loop\n"); 306 ppc_md.power_save = pseries_dedicated_idle_sleep; 307 } 308 } else { 309 printk(KERN_DEBUG "Using default idle loop\n"); 310 } 311 312 if (firmware_has_feature(FW_FEATURE_LPAR)) 313 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 314 else 315 ppc_md.enable_pmcs = power4_enable_pmcs; 316} 317 318static int __init pSeries_init_panel(void) 319{ 320 /* Manually leave the kernel version on the panel. */ 321 ppc_md.progress("Linux ppc64\n", 0); 322 ppc_md.progress(init_utsname()->version, 0); 323 324 return 0; 325} 326arch_initcall(pSeries_init_panel); 327 328static int pseries_set_dabr(unsigned long dabr) 329{ 330 return plpar_hcall_norets(H_SET_DABR, dabr); 331} 332 333static int pseries_set_xdabr(unsigned long dabr) 334{ 335 /* We want to catch accesses from kernel and userspace */ 336 return plpar_hcall_norets(H_SET_XDABR, dabr, 337 H_DABRX_KERNEL | H_DABRX_USER); 338} 339 340#define CMO_CHARACTERISTICS_TOKEN 44 341#define CMO_MAXLENGTH 1026 342 343/** 344 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 345 * handle that here. (Stolen from parse_system_parameter_string) 346 */ 347void pSeries_cmo_feature_init(void) 348{ 349 char *ptr, *key, *value, *end; 350 int call_status; 351 int page_order = IOMMU_PAGE_SHIFT; 352 353 pr_debug(" -> fw_cmo_feature_init()\n"); 354 spin_lock(&rtas_data_buf_lock); 355 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 356 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 357 NULL, 358 CMO_CHARACTERISTICS_TOKEN, 359 __pa(rtas_data_buf), 360 RTAS_DATA_BUF_SIZE); 361 362 if (call_status != 0) { 363 spin_unlock(&rtas_data_buf_lock); 364 pr_debug("CMO not available\n"); 365 pr_debug(" <- fw_cmo_feature_init()\n"); 366 return; 367 } 368 369 end = rtas_data_buf + CMO_MAXLENGTH - 2; 370 ptr = rtas_data_buf + 2; /* step over strlen value */ 371 key = value = ptr; 372 373 while (*ptr && (ptr <= end)) { 374 /* Separate the key and value by replacing '=' with '\0' and 375 * point the value at the string after the '=' 376 */ 377 if (ptr[0] == '=') { 378 ptr[0] = '\0'; 379 value = ptr + 1; 380 } else if (ptr[0] == '\0' || ptr[0] == ',') { 381 /* Terminate the string containing the key/value pair */ 382 ptr[0] = '\0'; 383 384 if (key == value) { 385 pr_debug("Malformed key/value pair\n"); 386 /* Never found a '=', end processing */ 387 break; 388 } 389 390 if (0 == strcmp(key, "CMOPageSize")) 391 page_order = simple_strtol(value, NULL, 10); 392 else if (0 == strcmp(key, "PrPSP")) 393 CMO_PrPSP = simple_strtol(value, NULL, 10); 394 else if (0 == strcmp(key, "SecPSP")) 395 CMO_SecPSP = simple_strtol(value, NULL, 10); 396 value = key = ptr + 1; 397 } 398 ptr++; 399 } 400 401 /* Page size is returned as the power of 2 of the page size, 402 * convert to the page size in bytes before returning 403 */ 404 CMO_PageSize = 1 << page_order; 405 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 406 407 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 408 pr_info("CMO enabled\n"); 409 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 410 CMO_SecPSP); 411 powerpc_firmware_features |= FW_FEATURE_CMO; 412 } else 413 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 414 CMO_SecPSP); 415 spin_unlock(&rtas_data_buf_lock); 416 pr_debug(" <- fw_cmo_feature_init()\n"); 417} 418 419/* 420 * Early initialization. Relocation is on but do not reference unbolted pages 421 */ 422static void __init pSeries_init_early(void) 423{ 424 pr_debug(" -> pSeries_init_early()\n"); 425 426 if (firmware_has_feature(FW_FEATURE_LPAR)) 427 find_udbg_vterm(); 428 429 if (firmware_has_feature(FW_FEATURE_DABR)) 430 ppc_md.set_dabr = pseries_set_dabr; 431 else if (firmware_has_feature(FW_FEATURE_XDABR)) 432 ppc_md.set_dabr = pseries_set_xdabr; 433 434 pSeries_cmo_feature_init(); 435 iommu_init_early_pSeries(); 436 437 pr_debug(" <- pSeries_init_early()\n"); 438} 439 440/* 441 * Called very early, MMU is off, device-tree isn't unflattened 442 */ 443 444static int __init pSeries_probe_hypertas(unsigned long node, 445 const char *uname, int depth, 446 void *data) 447{ 448 const char *hypertas; 449 unsigned long len; 450 451 if (depth != 1 || 452 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 453 return 0; 454 455 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); 456 if (!hypertas) 457 return 1; 458 459 powerpc_firmware_features |= FW_FEATURE_LPAR; 460 fw_feature_init(hypertas, len); 461 462 return 1; 463} 464 465static int __init pSeries_probe(void) 466{ 467 unsigned long root = of_get_flat_dt_root(); 468 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 469 470 if (dtype == NULL) 471 return 0; 472 if (strcmp(dtype, "chrp")) 473 return 0; 474 475 /* Cell blades firmware claims to be chrp while it's not. Until this 476 * is fixed, we need to avoid those here. 477 */ 478 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 479 of_flat_dt_is_compatible(root, "IBM,CBEA")) 480 return 0; 481 482 pr_debug("pSeries detected, looking for LPAR capability...\n"); 483 484 /* Now try to figure out if we are running on LPAR */ 485 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 486 487 if (firmware_has_feature(FW_FEATURE_LPAR)) 488 hpte_init_lpar(); 489 else 490 hpte_init_native(); 491 492 pr_debug("Machine is%s LPAR !\n", 493 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 494 495 return 1; 496} 497 498 499DECLARE_PER_CPU(long, smt_snooze_delay); 500 501static void pseries_dedicated_idle_sleep(void) 502{ 503 unsigned int cpu = smp_processor_id(); 504 unsigned long start_snooze; 505 unsigned long in_purr, out_purr; 506 long snooze = __get_cpu_var(smt_snooze_delay); 507 508 /* 509 * Indicate to the HV that we are idle. Now would be 510 * a good time to find other work to dispatch. 511 */ 512 get_lppaca()->idle = 1; 513 get_lppaca()->donate_dedicated_cpu = 1; 514 in_purr = mfspr(SPRN_PURR); 515 516 /* 517 * We come in with interrupts disabled, and need_resched() 518 * has been checked recently. If we should poll for a little 519 * while, do so. 520 */ 521 if (snooze) { 522 start_snooze = get_tb() + snooze * tb_ticks_per_usec; 523 local_irq_enable(); 524 set_thread_flag(TIF_POLLING_NRFLAG); 525 526 while ((snooze < 0) || (get_tb() < start_snooze)) { 527 if (need_resched() || cpu_is_offline(cpu)) 528 goto out; 529 ppc64_runlatch_off(); 530 HMT_low(); 531 HMT_very_low(); 532 } 533 534 HMT_medium(); 535 clear_thread_flag(TIF_POLLING_NRFLAG); 536 smp_mb(); 537 local_irq_disable(); 538 if (need_resched() || cpu_is_offline(cpu)) 539 goto out; 540 } 541 542 cede_processor(); 543 544out: 545 HMT_medium(); 546 out_purr = mfspr(SPRN_PURR); 547 get_lppaca()->wait_state_cycles += out_purr - in_purr; 548 get_lppaca()->donate_dedicated_cpu = 0; 549 get_lppaca()->idle = 0; 550} 551 552static void pseries_shared_idle_sleep(void) 553{ 554 /* 555 * Indicate to the HV that we are idle. Now would be 556 * a good time to find other work to dispatch. 557 */ 558 get_lppaca()->idle = 1; 559 560 /* 561 * Yield the processor to the hypervisor. We return if 562 * an external interrupt occurs (which are driven prior 563 * to returning here) or if a prod occurs from another 564 * processor. When returning here, external interrupts 565 * are enabled. 566 */ 567 cede_processor(); 568 569 get_lppaca()->idle = 0; 570} 571 572static int pSeries_pci_probe_mode(struct pci_bus *bus) 573{ 574 if (firmware_has_feature(FW_FEATURE_LPAR)) 575 return PCI_PROBE_DEVTREE; 576 return PCI_PROBE_NORMAL; 577} 578 579/** 580 * pSeries_power_off - tell firmware about how to power off the system. 581 * 582 * This function calls either the power-off rtas token in normal cases 583 * or the ibm,power-off-ups token (if present & requested) in case of 584 * a power failure. If power-off token is used, power on will only be 585 * possible with power button press. If ibm,power-off-ups token is used 586 * it will allow auto poweron after power is restored. 587 */ 588static void pSeries_power_off(void) 589{ 590 int rc; 591 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 592 593 if (rtas_flash_term_hook) 594 rtas_flash_term_hook(SYS_POWER_OFF); 595 596 if (rtas_poweron_auto == 0 || 597 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 598 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 599 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 600 } else { 601 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 602 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 603 } 604 for (;;); 605} 606 607#ifndef CONFIG_PCI 608void pSeries_final_fixup(void) { } 609#endif 610 611define_machine(pseries) { 612 .name = "pSeries", 613 .probe = pSeries_probe, 614 .setup_arch = pSeries_setup_arch, 615 .init_early = pSeries_init_early, 616 .show_cpuinfo = pSeries_show_cpuinfo, 617 .log_error = pSeries_log_error, 618 .pcibios_fixup = pSeries_final_fixup, 619 .pci_probe_mode = pSeries_pci_probe_mode, 620 .restart = rtas_restart, 621 .power_off = pSeries_power_off, 622 .halt = rtas_halt, 623 .panic = rtas_os_term, 624 .get_boot_time = rtas_get_boot_time, 625 .get_rtc_time = rtas_get_rtc_time, 626 .set_rtc_time = rtas_set_rtc_time, 627 .calibrate_decr = generic_calibrate_decr, 628 .progress = rtas_progress, 629 .system_reset_exception = pSeries_system_reset_exception, 630 .machine_check_exception = pSeries_machine_check_exception, 631}; 632