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 67 #include "plpar_wrappers.h" 68 #include "pseries.h" 69 70 int CMO_PrPSP = -1; 71 int CMO_SecPSP = -1; 72 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); 73 EXPORT_SYMBOL(CMO_PageSize); 74 75 int fwnmi_active; /* TRUE if an FWNMI handler is present */ 76 77 static void pseries_shared_idle_sleep(void); 78 static void pseries_dedicated_idle_sleep(void); 79 80 static struct device_node *pSeries_mpic_node; 81 82 static 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 */ 97 static 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 } 114 115 static 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 } 122 123 static 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 } 171 172 static 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 } 211 212 static void __init pseries_xics_init_IRQ(void) 213 { 214 xics_init_IRQ(); 215 pseries_setup_i8259_cascade(); 216 } 217 218 static 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 /* instruct hypervisor to maintain PMCs */ 227 if (firmware_has_feature(FW_FEATURE_SPLPAR)) 228 get_lppaca()->pmcregs_in_use = 1; 229 } 230 231 static void __init pseries_discover_pic(void) 232 { 233 struct device_node *np; 234 const char *typep; 235 236 for (np = NULL; (np = of_find_node_by_name(np, 237 "interrupt-controller"));) { 238 typep = of_get_property(np, "compatible", NULL); 239 if (strstr(typep, "open-pic")) { 240 pSeries_mpic_node = of_node_get(np); 241 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 242 ppc_md.get_irq = mpic_get_irq; 243 setup_kexec_cpu_down_mpic(); 244 smp_init_pseries_mpic(); 245 return; 246 } else if (strstr(typep, "ppc-xicp")) { 247 ppc_md.init_IRQ = pseries_xics_init_IRQ; 248 setup_kexec_cpu_down_xics(); 249 smp_init_pseries_xics(); 250 return; 251 } 252 } 253 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 254 " interrupt-controller\n"); 255 } 256 257 static void __init pSeries_setup_arch(void) 258 { 259 /* Discover PIC type and setup ppc_md accordingly */ 260 pseries_discover_pic(); 261 262 /* openpic global configuration register (64-bit format). */ 263 /* openpic Interrupt Source Unit pointer (64-bit format). */ 264 /* python0 facility area (mmio) (64-bit format) REAL address. */ 265 266 /* init to some ~sane value until calibrate_delay() runs */ 267 loops_per_jiffy = 50000000; 268 269 fwnmi_init(); 270 271 /* Find and initialize PCI host bridges */ 272 init_pci_config_tokens(); 273 find_and_init_phbs(); 274 eeh_init(); 275 276 pSeries_nvram_init(); 277 278 /* Choose an idle loop */ 279 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 280 vpa_init(boot_cpuid); 281 if (get_lppaca()->shared_proc) { 282 printk(KERN_DEBUG "Using shared processor idle loop\n"); 283 ppc_md.power_save = pseries_shared_idle_sleep; 284 } else { 285 printk(KERN_DEBUG "Using dedicated idle loop\n"); 286 ppc_md.power_save = pseries_dedicated_idle_sleep; 287 } 288 } else { 289 printk(KERN_DEBUG "Using default idle loop\n"); 290 } 291 292 if (firmware_has_feature(FW_FEATURE_LPAR)) 293 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 294 else 295 ppc_md.enable_pmcs = power4_enable_pmcs; 296 } 297 298 static int __init pSeries_init_panel(void) 299 { 300 /* Manually leave the kernel version on the panel. */ 301 ppc_md.progress("Linux ppc64\n", 0); 302 ppc_md.progress(init_utsname()->version, 0); 303 304 return 0; 305 } 306 arch_initcall(pSeries_init_panel); 307 308 static int pseries_set_dabr(unsigned long dabr) 309 { 310 return plpar_hcall_norets(H_SET_DABR, dabr); 311 } 312 313 static int pseries_set_xdabr(unsigned long dabr) 314 { 315 /* We want to catch accesses from kernel and userspace */ 316 return plpar_hcall_norets(H_SET_XDABR, dabr, 317 H_DABRX_KERNEL | H_DABRX_USER); 318 } 319 320 #define CMO_CHARACTERISTICS_TOKEN 44 321 #define CMO_MAXLENGTH 1026 322 323 /** 324 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 325 * handle that here. (Stolen from parse_system_parameter_string) 326 */ 327 void pSeries_cmo_feature_init(void) 328 { 329 char *ptr, *key, *value, *end; 330 int call_status; 331 int page_order = IOMMU_PAGE_SHIFT; 332 333 pr_debug(" -> fw_cmo_feature_init()\n"); 334 spin_lock(&rtas_data_buf_lock); 335 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 336 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 337 NULL, 338 CMO_CHARACTERISTICS_TOKEN, 339 __pa(rtas_data_buf), 340 RTAS_DATA_BUF_SIZE); 341 342 if (call_status != 0) { 343 spin_unlock(&rtas_data_buf_lock); 344 pr_debug("CMO not available\n"); 345 pr_debug(" <- fw_cmo_feature_init()\n"); 346 return; 347 } 348 349 end = rtas_data_buf + CMO_MAXLENGTH - 2; 350 ptr = rtas_data_buf + 2; /* step over strlen value */ 351 key = value = ptr; 352 353 while (*ptr && (ptr <= end)) { 354 /* Separate the key and value by replacing '=' with '\0' and 355 * point the value at the string after the '=' 356 */ 357 if (ptr[0] == '=') { 358 ptr[0] = '\0'; 359 value = ptr + 1; 360 } else if (ptr[0] == '\0' || ptr[0] == ',') { 361 /* Terminate the string containing the key/value pair */ 362 ptr[0] = '\0'; 363 364 if (key == value) { 365 pr_debug("Malformed key/value pair\n"); 366 /* Never found a '=', end processing */ 367 break; 368 } 369 370 if (0 == strcmp(key, "CMOPageSize")) 371 page_order = simple_strtol(value, NULL, 10); 372 else if (0 == strcmp(key, "PrPSP")) 373 CMO_PrPSP = simple_strtol(value, NULL, 10); 374 else if (0 == strcmp(key, "SecPSP")) 375 CMO_SecPSP = simple_strtol(value, NULL, 10); 376 value = key = ptr + 1; 377 } 378 ptr++; 379 } 380 381 /* Page size is returned as the power of 2 of the page size, 382 * convert to the page size in bytes before returning 383 */ 384 CMO_PageSize = 1 << page_order; 385 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 386 387 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 388 pr_info("CMO enabled\n"); 389 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 390 CMO_SecPSP); 391 powerpc_firmware_features |= FW_FEATURE_CMO; 392 } else 393 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 394 CMO_SecPSP); 395 spin_unlock(&rtas_data_buf_lock); 396 pr_debug(" <- fw_cmo_feature_init()\n"); 397 } 398 399 /* 400 * Early initialization. Relocation is on but do not reference unbolted pages 401 */ 402 static void __init pSeries_init_early(void) 403 { 404 pr_debug(" -> pSeries_init_early()\n"); 405 406 if (firmware_has_feature(FW_FEATURE_LPAR)) 407 find_udbg_vterm(); 408 409 if (firmware_has_feature(FW_FEATURE_DABR)) 410 ppc_md.set_dabr = pseries_set_dabr; 411 else if (firmware_has_feature(FW_FEATURE_XDABR)) 412 ppc_md.set_dabr = pseries_set_xdabr; 413 414 pSeries_cmo_feature_init(); 415 iommu_init_early_pSeries(); 416 417 pr_debug(" <- pSeries_init_early()\n"); 418 } 419 420 /* 421 * Called very early, MMU is off, device-tree isn't unflattened 422 */ 423 424 static int __init pSeries_probe_hypertas(unsigned long node, 425 const char *uname, int depth, 426 void *data) 427 { 428 const char *hypertas; 429 unsigned long len; 430 431 if (depth != 1 || 432 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 433 return 0; 434 435 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); 436 if (!hypertas) 437 return 1; 438 439 powerpc_firmware_features |= FW_FEATURE_LPAR; 440 fw_feature_init(hypertas, len); 441 442 return 1; 443 } 444 445 static int __init pSeries_probe(void) 446 { 447 unsigned long root = of_get_flat_dt_root(); 448 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 449 450 if (dtype == NULL) 451 return 0; 452 if (strcmp(dtype, "chrp")) 453 return 0; 454 455 /* Cell blades firmware claims to be chrp while it's not. Until this 456 * is fixed, we need to avoid those here. 457 */ 458 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 459 of_flat_dt_is_compatible(root, "IBM,CBEA")) 460 return 0; 461 462 pr_debug("pSeries detected, looking for LPAR capability...\n"); 463 464 /* Now try to figure out if we are running on LPAR */ 465 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 466 467 if (firmware_has_feature(FW_FEATURE_LPAR)) 468 hpte_init_lpar(); 469 else 470 hpte_init_native(); 471 472 pr_debug("Machine is%s LPAR !\n", 473 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 474 475 return 1; 476 } 477 478 479 DECLARE_PER_CPU(unsigned long, smt_snooze_delay); 480 481 static void pseries_dedicated_idle_sleep(void) 482 { 483 unsigned int cpu = smp_processor_id(); 484 unsigned long start_snooze; 485 unsigned long in_purr, out_purr; 486 487 /* 488 * Indicate to the HV that we are idle. Now would be 489 * a good time to find other work to dispatch. 490 */ 491 get_lppaca()->idle = 1; 492 get_lppaca()->donate_dedicated_cpu = 1; 493 in_purr = mfspr(SPRN_PURR); 494 495 /* 496 * We come in with interrupts disabled, and need_resched() 497 * has been checked recently. If we should poll for a little 498 * while, do so. 499 */ 500 if (__get_cpu_var(smt_snooze_delay)) { 501 start_snooze = get_tb() + 502 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec; 503 local_irq_enable(); 504 set_thread_flag(TIF_POLLING_NRFLAG); 505 506 while (get_tb() < start_snooze) { 507 if (need_resched() || cpu_is_offline(cpu)) 508 goto out; 509 ppc64_runlatch_off(); 510 HMT_low(); 511 HMT_very_low(); 512 } 513 514 HMT_medium(); 515 clear_thread_flag(TIF_POLLING_NRFLAG); 516 smp_mb(); 517 local_irq_disable(); 518 if (need_resched() || cpu_is_offline(cpu)) 519 goto out; 520 } 521 522 cede_processor(); 523 524 out: 525 HMT_medium(); 526 out_purr = mfspr(SPRN_PURR); 527 get_lppaca()->wait_state_cycles += out_purr - in_purr; 528 get_lppaca()->donate_dedicated_cpu = 0; 529 get_lppaca()->idle = 0; 530 } 531 532 static void pseries_shared_idle_sleep(void) 533 { 534 /* 535 * Indicate to the HV that we are idle. Now would be 536 * a good time to find other work to dispatch. 537 */ 538 get_lppaca()->idle = 1; 539 540 /* 541 * Yield the processor to the hypervisor. We return if 542 * an external interrupt occurs (which are driven prior 543 * to returning here) or if a prod occurs from another 544 * processor. When returning here, external interrupts 545 * are enabled. 546 */ 547 cede_processor(); 548 549 get_lppaca()->idle = 0; 550 } 551 552 static int pSeries_pci_probe_mode(struct pci_bus *bus) 553 { 554 if (firmware_has_feature(FW_FEATURE_LPAR)) 555 return PCI_PROBE_DEVTREE; 556 return PCI_PROBE_NORMAL; 557 } 558 559 /** 560 * pSeries_power_off - tell firmware about how to power off the system. 561 * 562 * This function calls either the power-off rtas token in normal cases 563 * or the ibm,power-off-ups token (if present & requested) in case of 564 * a power failure. If power-off token is used, power on will only be 565 * possible with power button press. If ibm,power-off-ups token is used 566 * it will allow auto poweron after power is restored. 567 */ 568 static void pSeries_power_off(void) 569 { 570 int rc; 571 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 572 573 if (rtas_flash_term_hook) 574 rtas_flash_term_hook(SYS_POWER_OFF); 575 576 if (rtas_poweron_auto == 0 || 577 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 578 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 579 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 580 } else { 581 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 582 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 583 } 584 for (;;); 585 } 586 587 #ifndef CONFIG_PCI 588 void pSeries_final_fixup(void) { } 589 #endif 590 591 define_machine(pseries) { 592 .name = "pSeries", 593 .probe = pSeries_probe, 594 .setup_arch = pSeries_setup_arch, 595 .init_early = pSeries_init_early, 596 .show_cpuinfo = pSeries_show_cpuinfo, 597 .log_error = pSeries_log_error, 598 .pcibios_fixup = pSeries_final_fixup, 599 .pci_probe_mode = pSeries_pci_probe_mode, 600 .restart = rtas_restart, 601 .power_off = pSeries_power_off, 602 .halt = rtas_halt, 603 .panic = rtas_os_term, 604 .get_boot_time = rtas_get_boot_time, 605 .get_rtc_time = rtas_get_rtc_time, 606 .set_rtc_time = rtas_set_rtc_time, 607 .calibrate_decr = generic_calibrate_decr, 608 .progress = rtas_progress, 609 .system_reset_exception = pSeries_system_reset_exception, 610 .machine_check_exception = pSeries_machine_check_exception, 611 }; 612