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/config.h> 16 #include <linux/module.h> 17 #include <linux/string.h> 18 #include <linux/sched.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/reboot.h> 22 #include <linux/delay.h> 23 #include <linux/initrd.h> 24 #include <linux/platform_device.h> 25 #include <linux/ide.h> 26 #include <linux/seq_file.h> 27 #include <linux/ioport.h> 28 #include <linux/console.h> 29 #include <linux/utsname.h> 30 #include <linux/tty.h> 31 #include <linux/root_dev.h> 32 #include <linux/notifier.h> 33 #include <linux/cpu.h> 34 #include <linux/unistd.h> 35 #include <linux/serial.h> 36 #include <linux/serial_8250.h> 37 #include <asm/io.h> 38 #include <asm/prom.h> 39 #include <asm/processor.h> 40 #include <asm/vdso_datapage.h> 41 #include <asm/pgtable.h> 42 #include <asm/smp.h> 43 #include <asm/elf.h> 44 #include <asm/machdep.h> 45 #include <asm/time.h> 46 #include <asm/cputable.h> 47 #include <asm/sections.h> 48 #include <asm/firmware.h> 49 #include <asm/btext.h> 50 #include <asm/nvram.h> 51 #include <asm/setup.h> 52 #include <asm/system.h> 53 #include <asm/rtas.h> 54 #include <asm/iommu.h> 55 #include <asm/serial.h> 56 #include <asm/cache.h> 57 #include <asm/page.h> 58 #include <asm/mmu.h> 59 #include <asm/lmb.h> 60 #include <asm/xmon.h> 61 62 #include "setup.h" 63 64 #ifdef DEBUG 65 #include <asm/udbg.h> 66 #define DBG(fmt...) udbg_printf(fmt) 67 #else 68 #define DBG(fmt...) 69 #endif 70 71 /* The main machine-dep calls structure 72 */ 73 struct machdep_calls ppc_md; 74 EXPORT_SYMBOL(ppc_md); 75 struct machdep_calls *machine_id; 76 EXPORT_SYMBOL(machine_id); 77 78 unsigned long klimit = (unsigned long) _end; 79 80 /* 81 * This still seems to be needed... -- paulus 82 */ 83 struct screen_info screen_info = { 84 .orig_x = 0, 85 .orig_y = 25, 86 .orig_video_cols = 80, 87 .orig_video_lines = 25, 88 .orig_video_isVGA = 1, 89 .orig_video_points = 16 90 }; 91 92 #ifdef __DO_IRQ_CANON 93 /* XXX should go elsewhere eventually */ 94 int ppc_do_canonicalize_irqs; 95 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 96 #endif 97 98 /* also used by kexec */ 99 void machine_shutdown(void) 100 { 101 if (ppc_md.machine_shutdown) 102 ppc_md.machine_shutdown(); 103 } 104 105 void machine_restart(char *cmd) 106 { 107 machine_shutdown(); 108 if (ppc_md.restart) 109 ppc_md.restart(cmd); 110 #ifdef CONFIG_SMP 111 smp_send_stop(); 112 #endif 113 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 114 local_irq_disable(); 115 while (1) ; 116 } 117 118 void machine_power_off(void) 119 { 120 machine_shutdown(); 121 if (ppc_md.power_off) 122 ppc_md.power_off(); 123 #ifdef CONFIG_SMP 124 smp_send_stop(); 125 #endif 126 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 127 local_irq_disable(); 128 while (1) ; 129 } 130 /* Used by the G5 thermal driver */ 131 EXPORT_SYMBOL_GPL(machine_power_off); 132 133 void (*pm_power_off)(void) = machine_power_off; 134 EXPORT_SYMBOL_GPL(pm_power_off); 135 136 void machine_halt(void) 137 { 138 machine_shutdown(); 139 if (ppc_md.halt) 140 ppc_md.halt(); 141 #ifdef CONFIG_SMP 142 smp_send_stop(); 143 #endif 144 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 145 local_irq_disable(); 146 while (1) ; 147 } 148 149 150 #ifdef CONFIG_TAU 151 extern u32 cpu_temp(unsigned long cpu); 152 extern u32 cpu_temp_both(unsigned long cpu); 153 #endif /* CONFIG_TAU */ 154 155 #ifdef CONFIG_SMP 156 DEFINE_PER_CPU(unsigned int, pvr); 157 #endif 158 159 static int show_cpuinfo(struct seq_file *m, void *v) 160 { 161 unsigned long cpu_id = (unsigned long)v - 1; 162 unsigned int pvr; 163 unsigned short maj; 164 unsigned short min; 165 166 if (cpu_id == NR_CPUS) { 167 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 168 unsigned long bogosum = 0; 169 int i; 170 for_each_online_cpu(i) 171 bogosum += loops_per_jiffy; 172 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 173 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 174 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 175 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 176 if (ppc_md.name) 177 seq_printf(m, "platform\t: %s\n", ppc_md.name); 178 if (ppc_md.show_cpuinfo != NULL) 179 ppc_md.show_cpuinfo(m); 180 181 return 0; 182 } 183 184 /* We only show online cpus: disable preempt (overzealous, I 185 * knew) to prevent cpu going down. */ 186 preempt_disable(); 187 if (!cpu_online(cpu_id)) { 188 preempt_enable(); 189 return 0; 190 } 191 192 #ifdef CONFIG_SMP 193 pvr = per_cpu(pvr, cpu_id); 194 #else 195 pvr = mfspr(SPRN_PVR); 196 #endif 197 maj = (pvr >> 8) & 0xFF; 198 min = pvr & 0xFF; 199 200 seq_printf(m, "processor\t: %lu\n", cpu_id); 201 seq_printf(m, "cpu\t\t: "); 202 203 if (cur_cpu_spec->pvr_mask) 204 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 205 else 206 seq_printf(m, "unknown (%08x)", pvr); 207 208 #ifdef CONFIG_ALTIVEC 209 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 210 seq_printf(m, ", altivec supported"); 211 #endif /* CONFIG_ALTIVEC */ 212 213 seq_printf(m, "\n"); 214 215 #ifdef CONFIG_TAU 216 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 217 #ifdef CONFIG_TAU_AVERAGE 218 /* more straightforward, but potentially misleading */ 219 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 220 cpu_temp(cpu_id)); 221 #else 222 /* show the actual temp sensor range */ 223 u32 temp; 224 temp = cpu_temp_both(cpu_id); 225 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 226 temp & 0xff, temp >> 16); 227 #endif 228 } 229 #endif /* CONFIG_TAU */ 230 231 /* 232 * Assume here that all clock rates are the same in a 233 * smp system. -- Cort 234 */ 235 if (ppc_proc_freq) 236 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 237 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); 238 239 if (ppc_md.show_percpuinfo != NULL) 240 ppc_md.show_percpuinfo(m, cpu_id); 241 242 /* If we are a Freescale core do a simple check so 243 * we dont have to keep adding cases in the future */ 244 if (PVR_VER(pvr) & 0x8000) { 245 maj = PVR_MAJ(pvr); 246 min = PVR_MIN(pvr); 247 } else { 248 switch (PVR_VER(pvr)) { 249 case 0x0020: /* 403 family */ 250 maj = PVR_MAJ(pvr) + 1; 251 min = PVR_MIN(pvr); 252 break; 253 case 0x1008: /* 740P/750P ?? */ 254 maj = ((pvr >> 8) & 0xFF) - 1; 255 min = pvr & 0xFF; 256 break; 257 default: 258 maj = (pvr >> 8) & 0xFF; 259 min = pvr & 0xFF; 260 break; 261 } 262 } 263 264 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 265 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 266 267 #ifdef CONFIG_PPC32 268 seq_printf(m, "bogomips\t: %lu.%02lu\n", 269 loops_per_jiffy / (500000/HZ), 270 (loops_per_jiffy / (5000/HZ)) % 100); 271 #endif 272 273 #ifdef CONFIG_SMP 274 seq_printf(m, "\n"); 275 #endif 276 277 preempt_enable(); 278 return 0; 279 } 280 281 static void *c_start(struct seq_file *m, loff_t *pos) 282 { 283 unsigned long i = *pos; 284 285 return i <= NR_CPUS ? (void *)(i + 1) : NULL; 286 } 287 288 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 289 { 290 ++*pos; 291 return c_start(m, pos); 292 } 293 294 static void c_stop(struct seq_file *m, void *v) 295 { 296 } 297 298 struct seq_operations cpuinfo_op = { 299 .start =c_start, 300 .next = c_next, 301 .stop = c_stop, 302 .show = show_cpuinfo, 303 }; 304 305 void __init check_for_initrd(void) 306 { 307 #ifdef CONFIG_BLK_DEV_INITRD 308 unsigned long *prop; 309 310 DBG(" -> check_for_initrd()\n"); 311 312 if (of_chosen) { 313 prop = (unsigned long *)get_property(of_chosen, 314 "linux,initrd-start", NULL); 315 if (prop != NULL) { 316 initrd_start = (unsigned long)__va(*prop); 317 prop = (unsigned long *)get_property(of_chosen, 318 "linux,initrd-end", NULL); 319 if (prop != NULL) { 320 initrd_end = (unsigned long)__va(*prop); 321 initrd_below_start_ok = 1; 322 } else 323 initrd_start = 0; 324 } 325 } 326 327 /* If we were passed an initrd, set the ROOT_DEV properly if the values 328 * look sensible. If not, clear initrd reference. 329 */ 330 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 331 initrd_end > initrd_start) 332 ROOT_DEV = Root_RAM0; 333 else 334 initrd_start = initrd_end = 0; 335 336 if (initrd_start) 337 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 338 339 DBG(" <- check_for_initrd()\n"); 340 #endif /* CONFIG_BLK_DEV_INITRD */ 341 } 342 343 #ifdef CONFIG_SMP 344 345 /** 346 * setup_cpu_maps - initialize the following cpu maps: 347 * cpu_possible_map 348 * cpu_present_map 349 * cpu_sibling_map 350 * 351 * Having the possible map set up early allows us to restrict allocations 352 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 353 * 354 * We do not initialize the online map here; cpus set their own bits in 355 * cpu_online_map as they come up. 356 * 357 * This function is valid only for Open Firmware systems. finish_device_tree 358 * must be called before using this. 359 * 360 * While we're here, we may as well set the "physical" cpu ids in the paca. 361 * 362 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 363 */ 364 void __init smp_setup_cpu_maps(void) 365 { 366 struct device_node *dn = NULL; 367 int cpu = 0; 368 369 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 370 int *intserv; 371 int j, len = sizeof(u32), nthreads = 1; 372 373 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s", 374 &len); 375 if (intserv) 376 nthreads = len / sizeof(int); 377 else { 378 intserv = (int *) 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 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 = (unsigned int *) 405 get_property(dn, "ibm,lrdr-capacity", NULL); 406 407 if (!ireg) 408 goto out; 409 410 maxcpus = ireg[num_addr_cell + num_size_cell]; 411 412 /* Double maxcpus for processors which have SMT capability */ 413 if (cpu_has_feature(CPU_FTR_SMT)) 414 maxcpus *= 2; 415 416 if (maxcpus > NR_CPUS) { 417 printk(KERN_WARNING 418 "Partition configured for %d cpus, " 419 "operating system maximum is %d.\n", 420 maxcpus, NR_CPUS); 421 maxcpus = NR_CPUS; 422 } else 423 printk(KERN_INFO "Partition configured for %d cpus.\n", 424 maxcpus); 425 426 for (cpu = 0; cpu < maxcpus; cpu++) 427 cpu_set(cpu, cpu_possible_map); 428 out: 429 of_node_put(dn); 430 } 431 432 /* 433 * Do the sibling map; assume only two threads per processor. 434 */ 435 for_each_possible_cpu(cpu) { 436 cpu_set(cpu, cpu_sibling_map[cpu]); 437 if (cpu_has_feature(CPU_FTR_SMT)) 438 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]); 439 } 440 441 vdso_data->processorCount = num_present_cpus(); 442 #endif /* CONFIG_PPC64 */ 443 } 444 #endif /* CONFIG_SMP */ 445 446 int __initdata do_early_xmon; 447 #ifdef CONFIG_XMON 448 static int __init early_xmon(char *p) 449 { 450 /* ensure xmon is enabled */ 451 if (p) { 452 if (strncmp(p, "on", 2) == 0) 453 xmon_init(1); 454 if (strncmp(p, "off", 3) == 0) 455 xmon_init(0); 456 if (strncmp(p, "early", 5) != 0) 457 return 0; 458 } 459 xmon_init(1); 460 do_early_xmon = 1; 461 462 return 0; 463 } 464 early_param("xmon", early_xmon); 465 #endif 466 467 static __init int add_pcspkr(void) 468 { 469 struct device_node *np; 470 struct platform_device *pd; 471 int ret; 472 473 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 474 of_node_put(np); 475 if (!np) 476 return -ENODEV; 477 478 pd = platform_device_alloc("pcspkr", -1); 479 if (!pd) 480 return -ENOMEM; 481 482 ret = platform_device_add(pd); 483 if (ret) 484 platform_device_put(pd); 485 486 return ret; 487 } 488 device_initcall(add_pcspkr); 489 490 void probe_machine(void) 491 { 492 extern struct machdep_calls __machine_desc_start; 493 extern struct machdep_calls __machine_desc_end; 494 495 /* 496 * Iterate all ppc_md structures until we find the proper 497 * one for the current machine type 498 */ 499 DBG("Probing machine type ...\n"); 500 501 for (machine_id = &__machine_desc_start; 502 machine_id < &__machine_desc_end; 503 machine_id++) { 504 DBG(" %s ...", machine_id->name); 505 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 506 if (ppc_md.probe()) { 507 DBG(" match !\n"); 508 break; 509 } 510 DBG("\n"); 511 } 512 /* What can we do if we didn't find ? */ 513 if (machine_id >= &__machine_desc_end) { 514 DBG("No suitable machine found !\n"); 515 for (;;); 516 } 517 518 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 519 } 520 521 int check_legacy_ioport(unsigned long base_port) 522 { 523 if (ppc_md.check_legacy_ioport == NULL) 524 return 0; 525 return ppc_md.check_legacy_ioport(base_port); 526 } 527 EXPORT_SYMBOL(check_legacy_ioport); 528 529 static int ppc_panic_event(struct notifier_block *this, 530 unsigned long event, void *ptr) 531 { 532 ppc_md.panic(ptr); /* May not return */ 533 return NOTIFY_DONE; 534 } 535 536 static struct notifier_block ppc_panic_block = { 537 .notifier_call = ppc_panic_event, 538 .priority = INT_MIN /* may not return; must be done last */ 539 }; 540 541 void __init setup_panic(void) 542 { 543 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 544 } 545