1 /* 2 * Common boot and setup code for both 32-bit and 64-bit. 3 * Extracted from arch/powerpc/kernel/setup_64.c. 4 * 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #undef DEBUG 14 15 #include <linux/module.h> 16 #include <linux/string.h> 17 #include <linux/sched.h> 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/reboot.h> 21 #include <linux/delay.h> 22 #include <linux/initrd.h> 23 #include <linux/platform_device.h> 24 #include <linux/seq_file.h> 25 #include <linux/ioport.h> 26 #include <linux/console.h> 27 #include <linux/utsname.h> 28 #include <linux/screen_info.h> 29 #include <linux/root_dev.h> 30 #include <linux/notifier.h> 31 #include <linux/cpu.h> 32 #include <linux/unistd.h> 33 #include <linux/serial.h> 34 #include <linux/serial_8250.h> 35 #include <linux/debugfs.h> 36 #include <asm/io.h> 37 #include <asm/prom.h> 38 #include <asm/processor.h> 39 #include <asm/vdso_datapage.h> 40 #include <asm/pgtable.h> 41 #include <asm/smp.h> 42 #include <asm/elf.h> 43 #include <asm/machdep.h> 44 #include <asm/time.h> 45 #include <asm/cputable.h> 46 #include <asm/sections.h> 47 #include <asm/firmware.h> 48 #include <asm/btext.h> 49 #include <asm/nvram.h> 50 #include <asm/setup.h> 51 #include <asm/system.h> 52 #include <asm/rtas.h> 53 #include <asm/iommu.h> 54 #include <asm/serial.h> 55 #include <asm/cache.h> 56 #include <asm/page.h> 57 #include <asm/mmu.h> 58 #include <asm/lmb.h> 59 #include <asm/xmon.h> 60 61 #include "setup.h" 62 63 #ifdef DEBUG 64 #include <asm/udbg.h> 65 #define DBG(fmt...) udbg_printf(fmt) 66 #else 67 #define DBG(fmt...) 68 #endif 69 70 /* The main machine-dep calls structure 71 */ 72 struct machdep_calls ppc_md; 73 EXPORT_SYMBOL(ppc_md); 74 struct machdep_calls *machine_id; 75 EXPORT_SYMBOL(machine_id); 76 77 unsigned long klimit = (unsigned long) _end; 78 79 char cmd_line[COMMAND_LINE_SIZE]; 80 81 /* 82 * This still seems to be needed... -- paulus 83 */ 84 struct screen_info screen_info = { 85 .orig_x = 0, 86 .orig_y = 25, 87 .orig_video_cols = 80, 88 .orig_video_lines = 25, 89 .orig_video_isVGA = 1, 90 .orig_video_points = 16 91 }; 92 93 #ifdef __DO_IRQ_CANON 94 /* XXX should go elsewhere eventually */ 95 int ppc_do_canonicalize_irqs; 96 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 97 #endif 98 99 /* also used by kexec */ 100 void machine_shutdown(void) 101 { 102 if (ppc_md.machine_shutdown) 103 ppc_md.machine_shutdown(); 104 } 105 106 void machine_restart(char *cmd) 107 { 108 machine_shutdown(); 109 if (ppc_md.restart) 110 ppc_md.restart(cmd); 111 #ifdef CONFIG_SMP 112 smp_send_stop(); 113 #endif 114 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 115 local_irq_disable(); 116 while (1) ; 117 } 118 119 void machine_power_off(void) 120 { 121 machine_shutdown(); 122 if (ppc_md.power_off) 123 ppc_md.power_off(); 124 #ifdef CONFIG_SMP 125 smp_send_stop(); 126 #endif 127 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 128 local_irq_disable(); 129 while (1) ; 130 } 131 /* Used by the G5 thermal driver */ 132 EXPORT_SYMBOL_GPL(machine_power_off); 133 134 void (*pm_power_off)(void) = machine_power_off; 135 EXPORT_SYMBOL_GPL(pm_power_off); 136 137 void machine_halt(void) 138 { 139 machine_shutdown(); 140 if (ppc_md.halt) 141 ppc_md.halt(); 142 #ifdef CONFIG_SMP 143 smp_send_stop(); 144 #endif 145 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 146 local_irq_disable(); 147 while (1) ; 148 } 149 150 151 #ifdef CONFIG_TAU 152 extern u32 cpu_temp(unsigned long cpu); 153 extern u32 cpu_temp_both(unsigned long cpu); 154 #endif /* CONFIG_TAU */ 155 156 #ifdef CONFIG_SMP 157 DEFINE_PER_CPU(unsigned int, pvr); 158 #endif 159 160 static int show_cpuinfo(struct seq_file *m, void *v) 161 { 162 unsigned long cpu_id = (unsigned long)v - 1; 163 unsigned int pvr; 164 unsigned short maj; 165 unsigned short min; 166 167 if (cpu_id == NR_CPUS) { 168 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 169 unsigned long bogosum = 0; 170 int i; 171 for_each_online_cpu(i) 172 bogosum += loops_per_jiffy; 173 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 174 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 175 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 176 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 177 if (ppc_md.name) 178 seq_printf(m, "platform\t: %s\n", ppc_md.name); 179 if (ppc_md.show_cpuinfo != NULL) 180 ppc_md.show_cpuinfo(m); 181 182 return 0; 183 } 184 185 /* We only show online cpus: disable preempt (overzealous, I 186 * knew) to prevent cpu going down. */ 187 preempt_disable(); 188 if (!cpu_online(cpu_id)) { 189 preempt_enable(); 190 return 0; 191 } 192 193 #ifdef CONFIG_SMP 194 pvr = per_cpu(pvr, cpu_id); 195 #else 196 pvr = mfspr(SPRN_PVR); 197 #endif 198 maj = (pvr >> 8) & 0xFF; 199 min = pvr & 0xFF; 200 201 seq_printf(m, "processor\t: %lu\n", cpu_id); 202 seq_printf(m, "cpu\t\t: "); 203 204 if (cur_cpu_spec->pvr_mask) 205 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 206 else 207 seq_printf(m, "unknown (%08x)", pvr); 208 209 #ifdef CONFIG_ALTIVEC 210 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 211 seq_printf(m, ", altivec supported"); 212 #endif /* CONFIG_ALTIVEC */ 213 214 seq_printf(m, "\n"); 215 216 #ifdef CONFIG_TAU 217 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 218 #ifdef CONFIG_TAU_AVERAGE 219 /* more straightforward, but potentially misleading */ 220 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 221 cpu_temp(cpu_id)); 222 #else 223 /* show the actual temp sensor range */ 224 u32 temp; 225 temp = cpu_temp_both(cpu_id); 226 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 227 temp & 0xff, temp >> 16); 228 #endif 229 } 230 #endif /* CONFIG_TAU */ 231 232 /* 233 * Assume here that all clock rates are the same in a 234 * smp system. -- Cort 235 */ 236 if (ppc_proc_freq) 237 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 238 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); 239 240 if (ppc_md.show_percpuinfo != NULL) 241 ppc_md.show_percpuinfo(m, cpu_id); 242 243 /* If we are a Freescale core do a simple check so 244 * we dont have to keep adding cases in the future */ 245 if (PVR_VER(pvr) & 0x8000) { 246 maj = PVR_MAJ(pvr); 247 min = PVR_MIN(pvr); 248 } else { 249 switch (PVR_VER(pvr)) { 250 case 0x0020: /* 403 family */ 251 maj = PVR_MAJ(pvr) + 1; 252 min = PVR_MIN(pvr); 253 break; 254 case 0x1008: /* 740P/750P ?? */ 255 maj = ((pvr >> 8) & 0xFF) - 1; 256 min = pvr & 0xFF; 257 break; 258 default: 259 maj = (pvr >> 8) & 0xFF; 260 min = pvr & 0xFF; 261 break; 262 } 263 } 264 265 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 266 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 267 268 #ifdef CONFIG_PPC32 269 seq_printf(m, "bogomips\t: %lu.%02lu\n", 270 loops_per_jiffy / (500000/HZ), 271 (loops_per_jiffy / (5000/HZ)) % 100); 272 #endif 273 274 #ifdef CONFIG_SMP 275 seq_printf(m, "\n"); 276 #endif 277 278 preempt_enable(); 279 return 0; 280 } 281 282 static void *c_start(struct seq_file *m, loff_t *pos) 283 { 284 unsigned long i = *pos; 285 286 return i <= NR_CPUS ? (void *)(i + 1) : NULL; 287 } 288 289 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 290 { 291 ++*pos; 292 return c_start(m, pos); 293 } 294 295 static void c_stop(struct seq_file *m, void *v) 296 { 297 } 298 299 struct seq_operations cpuinfo_op = { 300 .start =c_start, 301 .next = c_next, 302 .stop = c_stop, 303 .show = show_cpuinfo, 304 }; 305 306 void __init check_for_initrd(void) 307 { 308 #ifdef CONFIG_BLK_DEV_INITRD 309 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 310 initrd_start, initrd_end); 311 312 /* If we were passed an initrd, set the ROOT_DEV properly if the values 313 * look sensible. If not, clear initrd reference. 314 */ 315 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 316 initrd_end > initrd_start) 317 ROOT_DEV = Root_RAM0; 318 else 319 initrd_start = initrd_end = 0; 320 321 if (initrd_start) 322 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 323 324 DBG(" <- check_for_initrd()\n"); 325 #endif /* CONFIG_BLK_DEV_INITRD */ 326 } 327 328 #ifdef CONFIG_SMP 329 330 /** 331 * setup_cpu_maps - initialize the following cpu maps: 332 * cpu_possible_map 333 * cpu_present_map 334 * cpu_sibling_map 335 * 336 * Having the possible map set up early allows us to restrict allocations 337 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 338 * 339 * We do not initialize the online map here; cpus set their own bits in 340 * cpu_online_map as they come up. 341 * 342 * This function is valid only for Open Firmware systems. finish_device_tree 343 * must be called before using this. 344 * 345 * While we're here, we may as well set the "physical" cpu ids in the paca. 346 * 347 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 348 */ 349 void __init smp_setup_cpu_maps(void) 350 { 351 struct device_node *dn = NULL; 352 int cpu = 0; 353 354 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 355 const int *intserv; 356 int j, len = sizeof(u32), nthreads = 1; 357 358 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 359 &len); 360 if (intserv) 361 nthreads = len / sizeof(int); 362 else { 363 intserv = of_get_property(dn, "reg", NULL); 364 if (!intserv) 365 intserv = &cpu; /* assume logical == phys */ 366 } 367 368 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { 369 cpu_set(cpu, cpu_present_map); 370 set_hard_smp_processor_id(cpu, intserv[j]); 371 cpu_set(cpu, cpu_possible_map); 372 cpu++; 373 } 374 } 375 376 #ifdef CONFIG_PPC64 377 /* 378 * On pSeries LPAR, we need to know how many cpus 379 * could possibly be added to this partition. 380 */ 381 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) && 382 (dn = of_find_node_by_path("/rtas"))) { 383 int num_addr_cell, num_size_cell, maxcpus; 384 const unsigned int *ireg; 385 386 num_addr_cell = of_n_addr_cells(dn); 387 num_size_cell = of_n_size_cells(dn); 388 389 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 390 391 if (!ireg) 392 goto out; 393 394 maxcpus = ireg[num_addr_cell + num_size_cell]; 395 396 /* Double maxcpus for processors which have SMT capability */ 397 if (cpu_has_feature(CPU_FTR_SMT)) 398 maxcpus *= 2; 399 400 if (maxcpus > NR_CPUS) { 401 printk(KERN_WARNING 402 "Partition configured for %d cpus, " 403 "operating system maximum is %d.\n", 404 maxcpus, NR_CPUS); 405 maxcpus = NR_CPUS; 406 } else 407 printk(KERN_INFO "Partition configured for %d cpus.\n", 408 maxcpus); 409 410 for (cpu = 0; cpu < maxcpus; cpu++) 411 cpu_set(cpu, cpu_possible_map); 412 out: 413 of_node_put(dn); 414 } 415 416 vdso_data->processorCount = num_present_cpus(); 417 #endif /* CONFIG_PPC64 */ 418 } 419 420 /* 421 * Being that cpu_sibling_map is now a per_cpu array, then it cannot 422 * be initialized until the per_cpu areas have been created. This 423 * function is now called from setup_per_cpu_areas(). 424 */ 425 void __init smp_setup_cpu_sibling_map(void) 426 { 427 #if defined(CONFIG_PPC64) 428 int cpu; 429 430 /* 431 * Do the sibling map; assume only two threads per processor. 432 */ 433 for_each_possible_cpu(cpu) { 434 cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); 435 if (cpu_has_feature(CPU_FTR_SMT)) 436 cpu_set(cpu ^ 0x1, per_cpu(cpu_sibling_map, cpu)); 437 } 438 #endif /* CONFIG_PPC64 */ 439 } 440 #endif /* CONFIG_SMP */ 441 442 static __init int add_pcspkr(void) 443 { 444 struct device_node *np; 445 struct platform_device *pd; 446 int ret; 447 448 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 449 of_node_put(np); 450 if (!np) 451 return -ENODEV; 452 453 pd = platform_device_alloc("pcspkr", -1); 454 if (!pd) 455 return -ENOMEM; 456 457 ret = platform_device_add(pd); 458 if (ret) 459 platform_device_put(pd); 460 461 return ret; 462 } 463 device_initcall(add_pcspkr); 464 465 void probe_machine(void) 466 { 467 extern struct machdep_calls __machine_desc_start; 468 extern struct machdep_calls __machine_desc_end; 469 470 /* 471 * Iterate all ppc_md structures until we find the proper 472 * one for the current machine type 473 */ 474 DBG("Probing machine type ...\n"); 475 476 for (machine_id = &__machine_desc_start; 477 machine_id < &__machine_desc_end; 478 machine_id++) { 479 DBG(" %s ...", machine_id->name); 480 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 481 if (ppc_md.probe()) { 482 DBG(" match !\n"); 483 break; 484 } 485 DBG("\n"); 486 } 487 /* What can we do if we didn't find ? */ 488 if (machine_id >= &__machine_desc_end) { 489 DBG("No suitable machine found !\n"); 490 for (;;); 491 } 492 493 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 494 } 495 496 /* Match a class of boards, not a specific device configuration. */ 497 int check_legacy_ioport(unsigned long base_port) 498 { 499 struct device_node *parent, *np = NULL; 500 int ret = -ENODEV; 501 502 switch(base_port) { 503 case I8042_DATA_REG: 504 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 505 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 506 if (np) { 507 parent = of_get_parent(np); 508 of_node_put(np); 509 np = parent; 510 break; 511 } 512 np = of_find_node_by_type(NULL, "8042"); 513 /* Pegasos has no device_type on its 8042 node, look for the 514 * name instead */ 515 if (!np) 516 np = of_find_node_by_name(NULL, "8042"); 517 break; 518 case FDC_BASE: /* FDC1 */ 519 np = of_find_node_by_type(NULL, "fdc"); 520 break; 521 #ifdef CONFIG_PPC_PREP 522 case _PIDXR: 523 case _PNPWRP: 524 case PNPBIOS_BASE: 525 /* implement me */ 526 #endif 527 default: 528 /* ipmi is supposed to fail here */ 529 break; 530 } 531 if (!np) 532 return ret; 533 parent = of_get_parent(np); 534 if (parent) { 535 if (strcmp(parent->type, "isa") == 0) 536 ret = 0; 537 of_node_put(parent); 538 } 539 of_node_put(np); 540 return ret; 541 } 542 EXPORT_SYMBOL(check_legacy_ioport); 543 544 static int ppc_panic_event(struct notifier_block *this, 545 unsigned long event, void *ptr) 546 { 547 ppc_md.panic(ptr); /* May not return */ 548 return NOTIFY_DONE; 549 } 550 551 static struct notifier_block ppc_panic_block = { 552 .notifier_call = ppc_panic_event, 553 .priority = INT_MIN /* may not return; must be done last */ 554 }; 555 556 void __init setup_panic(void) 557 { 558 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 559 } 560 561 #ifdef CONFIG_CHECK_CACHE_COHERENCY 562 /* 563 * For platforms that have configurable cache-coherency. This function 564 * checks that the cache coherency setting of the kernel matches the setting 565 * left by the firmware, as indicated in the device tree. Since a mismatch 566 * will eventually result in DMA failures, we print * and error and call 567 * BUG() in that case. 568 */ 569 570 #ifdef CONFIG_NOT_COHERENT_CACHE 571 #define KERNEL_COHERENCY 0 572 #else 573 #define KERNEL_COHERENCY 1 574 #endif 575 576 static int __init check_cache_coherency(void) 577 { 578 struct device_node *np; 579 const void *prop; 580 int devtree_coherency; 581 582 np = of_find_node_by_path("/"); 583 prop = of_get_property(np, "coherency-off", NULL); 584 of_node_put(np); 585 586 devtree_coherency = prop ? 0 : 1; 587 588 if (devtree_coherency != KERNEL_COHERENCY) { 589 printk(KERN_ERR 590 "kernel coherency:%s != device tree_coherency:%s\n", 591 KERNEL_COHERENCY ? "on" : "off", 592 devtree_coherency ? "on" : "off"); 593 BUG(); 594 } 595 596 return 0; 597 } 598 599 late_initcall(check_cache_coherency); 600 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 601 602 #ifdef CONFIG_DEBUG_FS 603 struct dentry *powerpc_debugfs_root; 604 605 static int powerpc_debugfs_init(void) 606 { 607 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 608 609 return powerpc_debugfs_root == NULL; 610 } 611 arch_initcall(powerpc_debugfs_init); 612 #endif 613