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/a.out.h> 29 #include <linux/tty.h> 30 #include <linux/major.h> 31 #include <linux/interrupt.h> 32 #include <linux/reboot.h> 33 #include <linux/init.h> 34 #include <linux/ioport.h> 35 #include <linux/console.h> 36 #include <linux/pci.h> 37 #include <linux/utsname.h> 38 #include <linux/adb.h> 39 #include <linux/module.h> 40 #include <linux/delay.h> 41 #include <linux/irq.h> 42 #include <linux/seq_file.h> 43 #include <linux/root_dev.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 "xics.h" 59 #include <asm/pmc.h> 60 #include <asm/mpic.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 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 void __init pSeries_setup_arch(void) 259 { 260 /* Discover PIC type and setup ppc_md accordingly */ 261 pseries_discover_pic(); 262 263 /* openpic global configuration register (64-bit format). */ 264 /* openpic Interrupt Source Unit pointer (64-bit format). */ 265 /* python0 facility area (mmio) (64-bit format) REAL address. */ 266 267 /* init to some ~sane value until calibrate_delay() runs */ 268 loops_per_jiffy = 50000000; 269 270 fwnmi_init(); 271 272 /* Find and initialize PCI host bridges */ 273 init_pci_config_tokens(); 274 find_and_init_phbs(); 275 eeh_init(); 276 277 pSeries_nvram_init(); 278 279 /* Choose an idle loop */ 280 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 281 vpa_init(boot_cpuid); 282 if (get_lppaca()->shared_proc) { 283 printk(KERN_DEBUG "Using shared processor idle loop\n"); 284 ppc_md.power_save = pseries_shared_idle_sleep; 285 } else { 286 printk(KERN_DEBUG "Using dedicated idle loop\n"); 287 ppc_md.power_save = pseries_dedicated_idle_sleep; 288 } 289 } else { 290 printk(KERN_DEBUG "Using default idle loop\n"); 291 } 292 293 if (firmware_has_feature(FW_FEATURE_LPAR)) 294 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 295 else 296 ppc_md.enable_pmcs = power4_enable_pmcs; 297 } 298 299 static int __init pSeries_init_panel(void) 300 { 301 /* Manually leave the kernel version on the panel. */ 302 ppc_md.progress("Linux ppc64\n", 0); 303 ppc_md.progress(init_utsname()->version, 0); 304 305 return 0; 306 } 307 arch_initcall(pSeries_init_panel); 308 309 static int pseries_set_dabr(unsigned long dabr) 310 { 311 return plpar_hcall_norets(H_SET_DABR, dabr); 312 } 313 314 static int pseries_set_xdabr(unsigned long dabr) 315 { 316 /* We want to catch accesses from kernel and userspace */ 317 return plpar_hcall_norets(H_SET_XDABR, dabr, 318 H_DABRX_KERNEL | H_DABRX_USER); 319 } 320 321 #define CMO_CHARACTERISTICS_TOKEN 44 322 #define CMO_MAXLENGTH 1026 323 324 /** 325 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, 326 * handle that here. (Stolen from parse_system_parameter_string) 327 */ 328 void pSeries_cmo_feature_init(void) 329 { 330 char *ptr, *key, *value, *end; 331 int call_status; 332 int page_order = IOMMU_PAGE_SHIFT; 333 334 pr_debug(" -> fw_cmo_feature_init()\n"); 335 spin_lock(&rtas_data_buf_lock); 336 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 337 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 338 NULL, 339 CMO_CHARACTERISTICS_TOKEN, 340 __pa(rtas_data_buf), 341 RTAS_DATA_BUF_SIZE); 342 343 if (call_status != 0) { 344 spin_unlock(&rtas_data_buf_lock); 345 pr_debug("CMO not available\n"); 346 pr_debug(" <- fw_cmo_feature_init()\n"); 347 return; 348 } 349 350 end = rtas_data_buf + CMO_MAXLENGTH - 2; 351 ptr = rtas_data_buf + 2; /* step over strlen value */ 352 key = value = ptr; 353 354 while (*ptr && (ptr <= end)) { 355 /* Separate the key and value by replacing '=' with '\0' and 356 * point the value at the string after the '=' 357 */ 358 if (ptr[0] == '=') { 359 ptr[0] = '\0'; 360 value = ptr + 1; 361 } else if (ptr[0] == '\0' || ptr[0] == ',') { 362 /* Terminate the string containing the key/value pair */ 363 ptr[0] = '\0'; 364 365 if (key == value) { 366 pr_debug("Malformed key/value pair\n"); 367 /* Never found a '=', end processing */ 368 break; 369 } 370 371 if (0 == strcmp(key, "CMOPageSize")) 372 page_order = simple_strtol(value, NULL, 10); 373 else if (0 == strcmp(key, "PrPSP")) 374 CMO_PrPSP = simple_strtol(value, NULL, 10); 375 else if (0 == strcmp(key, "SecPSP")) 376 CMO_SecPSP = simple_strtol(value, NULL, 10); 377 value = key = ptr + 1; 378 } 379 ptr++; 380 } 381 382 /* Page size is returned as the power of 2 of the page size, 383 * convert to the page size in bytes before returning 384 */ 385 CMO_PageSize = 1 << page_order; 386 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); 387 388 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { 389 pr_info("CMO enabled\n"); 390 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 391 CMO_SecPSP); 392 powerpc_firmware_features |= FW_FEATURE_CMO; 393 } else 394 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, 395 CMO_SecPSP); 396 spin_unlock(&rtas_data_buf_lock); 397 pr_debug(" <- fw_cmo_feature_init()\n"); 398 } 399 400 /* 401 * Early initialization. Relocation is on but do not reference unbolted pages 402 */ 403 static void __init pSeries_init_early(void) 404 { 405 pr_debug(" -> pSeries_init_early()\n"); 406 407 if (firmware_has_feature(FW_FEATURE_LPAR)) 408 find_udbg_vterm(); 409 410 if (firmware_has_feature(FW_FEATURE_DABR)) 411 ppc_md.set_dabr = pseries_set_dabr; 412 else if (firmware_has_feature(FW_FEATURE_XDABR)) 413 ppc_md.set_dabr = pseries_set_xdabr; 414 415 pSeries_cmo_feature_init(); 416 iommu_init_early_pSeries(); 417 418 pr_debug(" <- pSeries_init_early()\n"); 419 } 420 421 /* 422 * Called very early, MMU is off, device-tree isn't unflattened 423 */ 424 425 static int __init pSeries_probe_hypertas(unsigned long node, 426 const char *uname, int depth, 427 void *data) 428 { 429 const char *hypertas; 430 unsigned long len; 431 432 if (depth != 1 || 433 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 434 return 0; 435 436 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); 437 if (!hypertas) 438 return 1; 439 440 powerpc_firmware_features |= FW_FEATURE_LPAR; 441 fw_feature_init(hypertas, len); 442 443 return 1; 444 } 445 446 static int __init pSeries_probe(void) 447 { 448 unsigned long root = of_get_flat_dt_root(); 449 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 450 451 if (dtype == NULL) 452 return 0; 453 if (strcmp(dtype, "chrp")) 454 return 0; 455 456 /* Cell blades firmware claims to be chrp while it's not. Until this 457 * is fixed, we need to avoid those here. 458 */ 459 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 460 of_flat_dt_is_compatible(root, "IBM,CBEA")) 461 return 0; 462 463 pr_debug("pSeries detected, looking for LPAR capability...\n"); 464 465 /* Now try to figure out if we are running on LPAR */ 466 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 467 468 if (firmware_has_feature(FW_FEATURE_LPAR)) 469 hpte_init_lpar(); 470 else 471 hpte_init_native(); 472 473 pr_debug("Machine is%s LPAR !\n", 474 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 475 476 return 1; 477 } 478 479 480 DECLARE_PER_CPU(unsigned long, smt_snooze_delay); 481 482 static void pseries_dedicated_idle_sleep(void) 483 { 484 unsigned int cpu = smp_processor_id(); 485 unsigned long start_snooze; 486 unsigned long in_purr, out_purr; 487 488 /* 489 * Indicate to the HV that we are idle. Now would be 490 * a good time to find other work to dispatch. 491 */ 492 get_lppaca()->idle = 1; 493 get_lppaca()->donate_dedicated_cpu = 1; 494 in_purr = mfspr(SPRN_PURR); 495 496 /* 497 * We come in with interrupts disabled, and need_resched() 498 * has been checked recently. If we should poll for a little 499 * while, do so. 500 */ 501 if (__get_cpu_var(smt_snooze_delay)) { 502 start_snooze = get_tb() + 503 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec; 504 local_irq_enable(); 505 set_thread_flag(TIF_POLLING_NRFLAG); 506 507 while (get_tb() < start_snooze) { 508 if (need_resched() || cpu_is_offline(cpu)) 509 goto out; 510 ppc64_runlatch_off(); 511 HMT_low(); 512 HMT_very_low(); 513 } 514 515 HMT_medium(); 516 clear_thread_flag(TIF_POLLING_NRFLAG); 517 smp_mb(); 518 local_irq_disable(); 519 if (need_resched() || cpu_is_offline(cpu)) 520 goto out; 521 } 522 523 cede_processor(); 524 525 out: 526 HMT_medium(); 527 out_purr = mfspr(SPRN_PURR); 528 get_lppaca()->wait_state_cycles += out_purr - in_purr; 529 get_lppaca()->donate_dedicated_cpu = 0; 530 get_lppaca()->idle = 0; 531 } 532 533 static void pseries_shared_idle_sleep(void) 534 { 535 /* 536 * Indicate to the HV that we are idle. Now would be 537 * a good time to find other work to dispatch. 538 */ 539 get_lppaca()->idle = 1; 540 541 /* 542 * Yield the processor to the hypervisor. We return if 543 * an external interrupt occurs (which are driven prior 544 * to returning here) or if a prod occurs from another 545 * processor. When returning here, external interrupts 546 * are enabled. 547 */ 548 cede_processor(); 549 550 get_lppaca()->idle = 0; 551 } 552 553 static int pSeries_pci_probe_mode(struct pci_bus *bus) 554 { 555 if (firmware_has_feature(FW_FEATURE_LPAR)) 556 return PCI_PROBE_DEVTREE; 557 return PCI_PROBE_NORMAL; 558 } 559 560 /** 561 * pSeries_power_off - tell firmware about how to power off the system. 562 * 563 * This function calls either the power-off rtas token in normal cases 564 * or the ibm,power-off-ups token (if present & requested) in case of 565 * a power failure. If power-off token is used, power on will only be 566 * possible with power button press. If ibm,power-off-ups token is used 567 * it will allow auto poweron after power is restored. 568 */ 569 static void pSeries_power_off(void) 570 { 571 int rc; 572 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 573 574 if (rtas_flash_term_hook) 575 rtas_flash_term_hook(SYS_POWER_OFF); 576 577 if (rtas_poweron_auto == 0 || 578 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 579 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 580 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 581 } else { 582 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 583 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 584 } 585 for (;;); 586 } 587 588 #ifndef CONFIG_PCI 589 void pSeries_final_fixup(void) { } 590 #endif 591 592 define_machine(pseries) { 593 .name = "pSeries", 594 .probe = pSeries_probe, 595 .setup_arch = pSeries_setup_arch, 596 .init_early = pSeries_init_early, 597 .show_cpuinfo = pSeries_show_cpuinfo, 598 .log_error = pSeries_log_error, 599 .pcibios_fixup = pSeries_final_fixup, 600 .pci_probe_mode = pSeries_pci_probe_mode, 601 .restart = rtas_restart, 602 .power_off = pSeries_power_off, 603 .halt = rtas_halt, 604 .panic = rtas_os_term, 605 .get_boot_time = rtas_get_boot_time, 606 .get_rtc_time = rtas_get_rtc_time, 607 .set_rtc_time = rtas_set_rtc_time, 608 .calibrate_decr = generic_calibrate_decr, 609 .progress = rtas_progress, 610 .system_reset_exception = pSeries_system_reset_exception, 611 .machine_check_exception = pSeries_machine_check_exception, 612 }; 613