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