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