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/ide.h> 25 #include <linux/seq_file.h> 26 #include <linux/ioport.h> 27 #include <linux/console.h> 28 #include <linux/utsname.h> 29 #include <linux/screen_info.h> 30 #include <linux/root_dev.h> 31 #include <linux/notifier.h> 32 #include <linux/cpu.h> 33 #include <linux/unistd.h> 34 #include <linux/serial.h> 35 #include <linux/serial_8250.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 const unsigned int *prop; 308 int len; 309 310 DBG(" -> check_for_initrd()\n"); 311 312 if (of_chosen) { 313 prop = get_property(of_chosen, "linux,initrd-start", &len); 314 if (prop != NULL) { 315 initrd_start = (unsigned long) 316 __va(of_read_ulong(prop, len / 4)); 317 prop = get_property(of_chosen, 318 "linux,initrd-end", &len); 319 if (prop != NULL) { 320 initrd_end = (unsigned long) 321 __va(of_read_ulong(prop, len / 4)); 322 initrd_below_start_ok = 1; 323 } else 324 initrd_start = 0; 325 } 326 } 327 328 /* If we were passed an initrd, set the ROOT_DEV properly if the values 329 * look sensible. If not, clear initrd reference. 330 */ 331 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 332 initrd_end > initrd_start) 333 ROOT_DEV = Root_RAM0; 334 else 335 initrd_start = initrd_end = 0; 336 337 if (initrd_start) 338 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 339 340 DBG(" <- check_for_initrd()\n"); 341 #endif /* CONFIG_BLK_DEV_INITRD */ 342 } 343 344 #ifdef CONFIG_SMP 345 346 /** 347 * setup_cpu_maps - initialize the following cpu maps: 348 * cpu_possible_map 349 * cpu_present_map 350 * cpu_sibling_map 351 * 352 * Having the possible map set up early allows us to restrict allocations 353 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 354 * 355 * We do not initialize the online map here; cpus set their own bits in 356 * cpu_online_map as they come up. 357 * 358 * This function is valid only for Open Firmware systems. finish_device_tree 359 * must be called before using this. 360 * 361 * While we're here, we may as well set the "physical" cpu ids in the paca. 362 * 363 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 364 */ 365 void __init smp_setup_cpu_maps(void) 366 { 367 struct device_node *dn = NULL; 368 int cpu = 0; 369 370 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 371 const int *intserv; 372 int j, len = sizeof(u32), nthreads = 1; 373 374 intserv = get_property(dn, "ibm,ppc-interrupt-server#s", &len); 375 if (intserv) 376 nthreads = len / sizeof(int); 377 else { 378 intserv = get_property(dn, "reg", NULL); 379 if (!intserv) 380 intserv = &cpu; /* assume logical == phys */ 381 } 382 383 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { 384 cpu_set(cpu, cpu_present_map); 385 set_hard_smp_processor_id(cpu, intserv[j]); 386 cpu_set(cpu, cpu_possible_map); 387 cpu++; 388 } 389 } 390 391 #ifdef CONFIG_PPC64 392 /* 393 * On pSeries LPAR, we need to know how many cpus 394 * could possibly be added to this partition. 395 */ 396 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) && 397 (dn = of_find_node_by_path("/rtas"))) { 398 int num_addr_cell, num_size_cell, maxcpus; 399 const unsigned int *ireg; 400 401 num_addr_cell = prom_n_addr_cells(dn); 402 num_size_cell = prom_n_size_cells(dn); 403 404 ireg = get_property(dn, "ibm,lrdr-capacity", NULL); 405 406 if (!ireg) 407 goto out; 408 409 maxcpus = ireg[num_addr_cell + num_size_cell]; 410 411 /* Double maxcpus for processors which have SMT capability */ 412 if (cpu_has_feature(CPU_FTR_SMT)) 413 maxcpus *= 2; 414 415 if (maxcpus > NR_CPUS) { 416 printk(KERN_WARNING 417 "Partition configured for %d cpus, " 418 "operating system maximum is %d.\n", 419 maxcpus, NR_CPUS); 420 maxcpus = NR_CPUS; 421 } else 422 printk(KERN_INFO "Partition configured for %d cpus.\n", 423 maxcpus); 424 425 for (cpu = 0; cpu < maxcpus; cpu++) 426 cpu_set(cpu, cpu_possible_map); 427 out: 428 of_node_put(dn); 429 } 430 431 /* 432 * Do the sibling map; assume only two threads per processor. 433 */ 434 for_each_possible_cpu(cpu) { 435 cpu_set(cpu, cpu_sibling_map[cpu]); 436 if (cpu_has_feature(CPU_FTR_SMT)) 437 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]); 438 } 439 440 vdso_data->processorCount = num_present_cpus(); 441 #endif /* CONFIG_PPC64 */ 442 } 443 #endif /* CONFIG_SMP */ 444 445 int __initdata do_early_xmon; 446 #ifdef CONFIG_XMON 447 extern int xmon_no_auto_backtrace; 448 449 static int __init early_xmon(char *p) 450 { 451 /* ensure xmon is enabled */ 452 if (p) { 453 if (strncmp(p, "on", 2) == 0) 454 xmon_init(1); 455 if (strncmp(p, "off", 3) == 0) 456 xmon_init(0); 457 if (strncmp(p, "nobt", 4) == 0) 458 xmon_no_auto_backtrace = 1; 459 if (strncmp(p, "early", 5) != 0) 460 return 0; 461 } 462 xmon_init(1); 463 do_early_xmon = 1; 464 465 return 0; 466 } 467 early_param("xmon", early_xmon); 468 #endif 469 470 static __init int add_pcspkr(void) 471 { 472 struct device_node *np; 473 struct platform_device *pd; 474 int ret; 475 476 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 477 of_node_put(np); 478 if (!np) 479 return -ENODEV; 480 481 pd = platform_device_alloc("pcspkr", -1); 482 if (!pd) 483 return -ENOMEM; 484 485 ret = platform_device_add(pd); 486 if (ret) 487 platform_device_put(pd); 488 489 return ret; 490 } 491 device_initcall(add_pcspkr); 492 493 void probe_machine(void) 494 { 495 extern struct machdep_calls __machine_desc_start; 496 extern struct machdep_calls __machine_desc_end; 497 498 /* 499 * Iterate all ppc_md structures until we find the proper 500 * one for the current machine type 501 */ 502 DBG("Probing machine type ...\n"); 503 504 for (machine_id = &__machine_desc_start; 505 machine_id < &__machine_desc_end; 506 machine_id++) { 507 DBG(" %s ...", machine_id->name); 508 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 509 if (ppc_md.probe()) { 510 DBG(" match !\n"); 511 break; 512 } 513 DBG("\n"); 514 } 515 /* What can we do if we didn't find ? */ 516 if (machine_id >= &__machine_desc_end) { 517 DBG("No suitable machine found !\n"); 518 for (;;); 519 } 520 521 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 522 } 523 524 int check_legacy_ioport(unsigned long base_port) 525 { 526 if (ppc_md.check_legacy_ioport == NULL) 527 return 0; 528 return ppc_md.check_legacy_ioport(base_port); 529 } 530 EXPORT_SYMBOL(check_legacy_ioport); 531 532 static int ppc_panic_event(struct notifier_block *this, 533 unsigned long event, void *ptr) 534 { 535 ppc_md.panic(ptr); /* May not return */ 536 return NOTIFY_DONE; 537 } 538 539 static struct notifier_block ppc_panic_block = { 540 .notifier_call = ppc_panic_event, 541 .priority = INT_MIN /* may not return; must be done last */ 542 }; 543 544 void __init setup_panic(void) 545 { 546 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 547 } 548