setup_64.c revision 5ad570786158e327a1c5d32dd3d66f26d8de6340
1/* 2 * 3 * Common boot and setup code. 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/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/tty.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/pgtable.h> 40#include <asm/smp.h> 41#include <asm/elf.h> 42#include <asm/machdep.h> 43#include <asm/paca.h> 44#include <asm/ppcdebug.h> 45#include <asm/time.h> 46#include <asm/cputable.h> 47#include <asm/sections.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/iseries/it_lp_naca.h> 60#include <asm/firmware.h> 61#include <asm/systemcfg.h> 62#include <asm/xmon.h> 63 64#ifdef DEBUG 65#define DBG(fmt...) udbg_printf(fmt) 66#else 67#define DBG(fmt...) 68#endif 69 70/* 71 * Here are some early debugging facilities. You can enable one 72 * but your kernel will not boot on anything else if you do so 73 */ 74 75/* This one is for use on LPAR machines that support an HVC console 76 * on vterm 0 77 */ 78extern void udbg_init_debug_lpar(void); 79/* This one is for use on Apple G5 machines 80 */ 81extern void udbg_init_pmac_realmode(void); 82/* That's RTAS panel debug */ 83extern void call_rtas_display_status_delay(unsigned char c); 84/* Here's maple real mode debug */ 85extern void udbg_init_maple_realmode(void); 86 87#define EARLY_DEBUG_INIT() do {} while(0) 88 89#if 0 90#define EARLY_DEBUG_INIT() udbg_init_debug_lpar() 91#define EARLY_DEBUG_INIT() udbg_init_maple_realmode() 92#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode() 93#define EARLY_DEBUG_INIT() \ 94 do { udbg_putc = call_rtas_display_status_delay; } while(0) 95#endif 96 97/* extern void *stab; */ 98extern unsigned long klimit; 99 100extern void mm_init_ppc64(void); 101extern void stab_initialize(unsigned long stab); 102extern void htab_initialize(void); 103extern void early_init_devtree(void *flat_dt); 104extern void unflatten_device_tree(void); 105 106int have_of = 1; 107int boot_cpuid = 0; 108int boot_cpuid_phys = 0; 109dev_t boot_dev; 110u64 ppc64_pft_size; 111 112struct ppc64_caches ppc64_caches; 113EXPORT_SYMBOL_GPL(ppc64_caches); 114 115/* 116 * These are used in binfmt_elf.c to put aux entries on the stack 117 * for each elf executable being started. 118 */ 119int dcache_bsize; 120int icache_bsize; 121int ucache_bsize; 122 123/* The main machine-dep calls structure 124 */ 125struct machdep_calls ppc_md; 126EXPORT_SYMBOL(ppc_md); 127 128#ifdef CONFIG_MAGIC_SYSRQ 129unsigned long SYSRQ_KEY; 130#endif /* CONFIG_MAGIC_SYSRQ */ 131 132 133static int ppc64_panic_event(struct notifier_block *, unsigned long, void *); 134static struct notifier_block ppc64_panic_block = { 135 .notifier_call = ppc64_panic_event, 136 .priority = INT_MIN /* may not return; must be done last */ 137}; 138 139#ifdef CONFIG_SMP 140 141static int smt_enabled_cmdline; 142 143/* Look for ibm,smt-enabled OF option */ 144static void check_smt_enabled(void) 145{ 146 struct device_node *dn; 147 char *smt_option; 148 149 /* Allow the command line to overrule the OF option */ 150 if (smt_enabled_cmdline) 151 return; 152 153 dn = of_find_node_by_path("/options"); 154 155 if (dn) { 156 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL); 157 158 if (smt_option) { 159 if (!strcmp(smt_option, "on")) 160 smt_enabled_at_boot = 1; 161 else if (!strcmp(smt_option, "off")) 162 smt_enabled_at_boot = 0; 163 } 164 } 165} 166 167/* Look for smt-enabled= cmdline option */ 168static int __init early_smt_enabled(char *p) 169{ 170 smt_enabled_cmdline = 1; 171 172 if (!p) 173 return 0; 174 175 if (!strcmp(p, "on") || !strcmp(p, "1")) 176 smt_enabled_at_boot = 1; 177 else if (!strcmp(p, "off") || !strcmp(p, "0")) 178 smt_enabled_at_boot = 0; 179 180 return 0; 181} 182early_param("smt-enabled", early_smt_enabled); 183 184#else 185#define check_smt_enabled() 186#endif /* CONFIG_SMP */ 187 188extern struct machdep_calls pSeries_md; 189extern struct machdep_calls pmac_md; 190extern struct machdep_calls maple_md; 191extern struct machdep_calls cell_md; 192extern struct machdep_calls iseries_md; 193 194/* Ultimately, stuff them in an elf section like initcalls... */ 195static struct machdep_calls __initdata *machines[] = { 196#ifdef CONFIG_PPC_PSERIES 197 &pSeries_md, 198#endif /* CONFIG_PPC_PSERIES */ 199#ifdef CONFIG_PPC_PMAC 200 &pmac_md, 201#endif /* CONFIG_PPC_PMAC */ 202#ifdef CONFIG_PPC_MAPLE 203 &maple_md, 204#endif /* CONFIG_PPC_MAPLE */ 205#ifdef CONFIG_PPC_CELL 206 &cell_md, 207#endif 208#ifdef CONFIG_PPC_ISERIES 209 &iseries_md, 210#endif 211 NULL 212}; 213 214/* 215 * Early initialization entry point. This is called by head.S 216 * with MMU translation disabled. We rely on the "feature" of 217 * the CPU that ignores the top 2 bits of the address in real 218 * mode so we can access kernel globals normally provided we 219 * only toy with things in the RMO region. From here, we do 220 * some early parsing of the device-tree to setup out LMB 221 * data structures, and allocate & initialize the hash table 222 * and segment tables so we can start running with translation 223 * enabled. 224 * 225 * It is this function which will call the probe() callback of 226 * the various platform types and copy the matching one to the 227 * global ppc_md structure. Your platform can eventually do 228 * some very early initializations from the probe() routine, but 229 * this is not recommended, be very careful as, for example, the 230 * device-tree is not accessible via normal means at this point. 231 */ 232 233void __init early_setup(unsigned long dt_ptr) 234{ 235 struct paca_struct *lpaca = get_paca(); 236 static struct machdep_calls **mach; 237 238 /* 239 * Enable early debugging if any specified (see top of 240 * this file) 241 */ 242 EARLY_DEBUG_INIT(); 243 244 DBG(" -> early_setup()\n"); 245 246 /* 247 * Fill the default DBG level (do we want to keep 248 * that old mecanism around forever ?) 249 */ 250 ppcdbg_initialize(); 251 252 /* 253 * Do early initializations using the flattened device 254 * tree, like retreiving the physical memory map or 255 * calculating/retreiving the hash table size 256 */ 257 early_init_devtree(__va(dt_ptr)); 258 259 /* 260 * Iterate all ppc_md structures until we find the proper 261 * one for the current machine type 262 */ 263 DBG("Probing machine type for platform %x...\n", 264 systemcfg->platform); 265 266 for (mach = machines; *mach; mach++) { 267 if ((*mach)->probe(systemcfg->platform)) 268 break; 269 } 270 /* What can we do if we didn't find ? */ 271 if (*mach == NULL) { 272 DBG("No suitable machine found !\n"); 273 for (;;); 274 } 275 ppc_md = **mach; 276 277 DBG("Found, Initializing memory management...\n"); 278 279 /* 280 * Initialize stab / SLB management 281 */ 282 if (!firmware_has_feature(FW_FEATURE_ISERIES)) 283 stab_initialize(lpaca->stab_real); 284 285 /* 286 * Initialize the MMU Hash table and create the linear mapping 287 * of memory 288 */ 289 htab_initialize(); 290 291 DBG(" <- early_setup()\n"); 292} 293 294 295#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 296void smp_release_cpus(void) 297{ 298 extern unsigned long __secondary_hold_spinloop; 299 300 DBG(" -> smp_release_cpus()\n"); 301 302 /* All secondary cpus are spinning on a common spinloop, release them 303 * all now so they can start to spin on their individual paca 304 * spinloops. For non SMP kernels, the secondary cpus never get out 305 * of the common spinloop. 306 * This is useless but harmless on iSeries, secondaries are already 307 * waiting on their paca spinloops. */ 308 309 __secondary_hold_spinloop = 1; 310 mb(); 311 312 DBG(" <- smp_release_cpus()\n"); 313} 314#else 315#define smp_release_cpus() 316#endif /* CONFIG_SMP || CONFIG_KEXEC */ 317 318/* 319 * Initialize some remaining members of the ppc64_caches and systemcfg structures 320 * (at least until we get rid of them completely). This is mostly some 321 * cache informations about the CPU that will be used by cache flush 322 * routines and/or provided to userland 323 */ 324static void __init initialize_cache_info(void) 325{ 326 struct device_node *np; 327 unsigned long num_cpus = 0; 328 329 DBG(" -> initialize_cache_info()\n"); 330 331 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 332 num_cpus += 1; 333 334 /* We're assuming *all* of the CPUs have the same 335 * d-cache and i-cache sizes... -Peter 336 */ 337 338 if ( num_cpus == 1 ) { 339 u32 *sizep, *lsizep; 340 u32 size, lsize; 341 const char *dc, *ic; 342 343 /* Then read cache informations */ 344 if (systemcfg->platform == PLATFORM_POWERMAC) { 345 dc = "d-cache-block-size"; 346 ic = "i-cache-block-size"; 347 } else { 348 dc = "d-cache-line-size"; 349 ic = "i-cache-line-size"; 350 } 351 352 size = 0; 353 lsize = cur_cpu_spec->dcache_bsize; 354 sizep = (u32 *)get_property(np, "d-cache-size", NULL); 355 if (sizep != NULL) 356 size = *sizep; 357 lsizep = (u32 *) get_property(np, dc, NULL); 358 if (lsizep != NULL) 359 lsize = *lsizep; 360 if (sizep == 0 || lsizep == 0) 361 DBG("Argh, can't find dcache properties ! " 362 "sizep: %p, lsizep: %p\n", sizep, lsizep); 363 364 systemcfg->dcache_size = ppc64_caches.dsize = size; 365 systemcfg->dcache_line_size = 366 ppc64_caches.dline_size = lsize; 367 ppc64_caches.log_dline_size = __ilog2(lsize); 368 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 369 370 size = 0; 371 lsize = cur_cpu_spec->icache_bsize; 372 sizep = (u32 *)get_property(np, "i-cache-size", NULL); 373 if (sizep != NULL) 374 size = *sizep; 375 lsizep = (u32 *)get_property(np, ic, NULL); 376 if (lsizep != NULL) 377 lsize = *lsizep; 378 if (sizep == 0 || lsizep == 0) 379 DBG("Argh, can't find icache properties ! " 380 "sizep: %p, lsizep: %p\n", sizep, lsizep); 381 382 systemcfg->icache_size = ppc64_caches.isize = size; 383 systemcfg->icache_line_size = 384 ppc64_caches.iline_size = lsize; 385 ppc64_caches.log_iline_size = __ilog2(lsize); 386 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 387 } 388 } 389 390 /* Add an eye catcher and the systemcfg layout version number */ 391 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64"); 392 systemcfg->version.major = SYSTEMCFG_MAJOR; 393 systemcfg->version.minor = SYSTEMCFG_MINOR; 394 systemcfg->processor = mfspr(SPRN_PVR); 395 396 DBG(" <- initialize_cache_info()\n"); 397} 398 399static void __init check_for_initrd(void) 400{ 401#ifdef CONFIG_BLK_DEV_INITRD 402 u64 *prop; 403 404 DBG(" -> check_for_initrd()\n"); 405 406 if (of_chosen) { 407 prop = (u64 *)get_property(of_chosen, 408 "linux,initrd-start", NULL); 409 if (prop != NULL) { 410 initrd_start = (unsigned long)__va(*prop); 411 prop = (u64 *)get_property(of_chosen, 412 "linux,initrd-end", NULL); 413 if (prop != NULL) { 414 initrd_end = (unsigned long)__va(*prop); 415 initrd_below_start_ok = 1; 416 } else 417 initrd_start = 0; 418 } 419 } 420 421 /* If we were passed an initrd, set the ROOT_DEV properly if the values 422 * look sensible. If not, clear initrd reference. 423 */ 424 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE && 425 initrd_end > initrd_start) 426 ROOT_DEV = Root_RAM0; 427 else 428 initrd_start = initrd_end = 0; 429 430 if (initrd_start) 431 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 432 433 DBG(" <- check_for_initrd()\n"); 434#endif /* CONFIG_BLK_DEV_INITRD */ 435} 436 437/* 438 * Do some initial setup of the system. The parameters are those which 439 * were passed in from the bootloader. 440 */ 441void __init setup_system(void) 442{ 443 DBG(" -> setup_system()\n"); 444 445 /* 446 * Unflatten the device-tree passed by prom_init or kexec 447 */ 448 unflatten_device_tree(); 449 450 /* 451 * Fill the ppc64_caches & systemcfg structures with informations 452 * retreived from the device-tree. Need to be called before 453 * finish_device_tree() since the later requires some of the 454 * informations filled up here to properly parse the interrupt 455 * tree. 456 * It also sets up the cache line sizes which allows to call 457 * routines like flush_icache_range (used by the hash init 458 * later on). 459 */ 460 initialize_cache_info(); 461 462#ifdef CONFIG_PPC_RTAS 463 /* 464 * Initialize RTAS if available 465 */ 466 rtas_initialize(); 467#endif /* CONFIG_PPC_RTAS */ 468 469 /* 470 * Check if we have an initrd provided via the device-tree 471 */ 472 check_for_initrd(); 473 474 /* 475 * Do some platform specific early initializations, that includes 476 * setting up the hash table pointers. It also sets up some interrupt-mapping 477 * related options that will be used by finish_device_tree() 478 */ 479 ppc_md.init_early(); 480 481 /* 482 * "Finish" the device-tree, that is do the actual parsing of 483 * some of the properties like the interrupt map 484 */ 485 finish_device_tree(); 486 487#ifdef CONFIG_BOOTX_TEXT 488 init_boot_display(); 489#endif 490 491 /* 492 * Initialize xmon 493 */ 494#ifdef CONFIG_XMON_DEFAULT 495 xmon_init(1); 496#endif 497 /* 498 * Register early console 499 */ 500 register_early_udbg_console(); 501 502 /* Save unparsed command line copy for /proc/cmdline */ 503 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); 504 505 parse_early_param(); 506 507 check_smt_enabled(); 508 smp_setup_cpu_maps(); 509 510 /* Release secondary cpus out of their spinloops at 0x60 now that 511 * we can map physical -> logical CPU ids 512 */ 513 smp_release_cpus(); 514 515 printk("Starting Linux PPC64 %s\n", system_utsname.version); 516 517 printk("-----------------------------------------------------\n"); 518 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); 519 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch); 520 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller); 521 printk("systemcfg = 0x%p\n", systemcfg); 522 printk("systemcfg->platform = 0x%x\n", systemcfg->platform); 523 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount); 524 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize); 525 printk("ppc64_caches.dcache_line_size = 0x%x\n", 526 ppc64_caches.dline_size); 527 printk("ppc64_caches.icache_line_size = 0x%x\n", 528 ppc64_caches.iline_size); 529 printk("htab_address = 0x%p\n", htab_address); 530 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 531 printk("-----------------------------------------------------\n"); 532 533 mm_init_ppc64(); 534 535 DBG(" <- setup_system()\n"); 536} 537 538static int ppc64_panic_event(struct notifier_block *this, 539 unsigned long event, void *ptr) 540{ 541 ppc_md.panic((char *)ptr); /* May not return */ 542 return NOTIFY_DONE; 543} 544 545#ifdef CONFIG_IRQSTACKS 546static void __init irqstack_early_init(void) 547{ 548 unsigned int i; 549 550 /* 551 * interrupt stacks must be under 256MB, we cannot afford to take 552 * SLB misses on them. 553 */ 554 for_each_cpu(i) { 555 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE, 556 THREAD_SIZE, 0x10000000)); 557 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE, 558 THREAD_SIZE, 0x10000000)); 559 } 560} 561#else 562#define irqstack_early_init() 563#endif 564 565/* 566 * Stack space used when we detect a bad kernel stack pointer, and 567 * early in SMP boots before relocation is enabled. 568 */ 569static void __init emergency_stack_init(void) 570{ 571 unsigned long limit; 572 unsigned int i; 573 574 /* 575 * Emergency stacks must be under 256MB, we cannot afford to take 576 * SLB misses on them. The ABI also requires them to be 128-byte 577 * aligned. 578 * 579 * Since we use these as temporary stacks during secondary CPU 580 * bringup, we need to get at them in real mode. This means they 581 * must also be within the RMO region. 582 */ 583 limit = min(0x10000000UL, lmb.rmo_size); 584 585 for_each_cpu(i) 586 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128, 587 limit)) + PAGE_SIZE; 588} 589 590/* 591 * Called from setup_arch to initialize the bitmap of available 592 * syscalls in the systemcfg page 593 */ 594void __init setup_syscall_map(void) 595{ 596 unsigned int i, count64 = 0, count32 = 0; 597 extern unsigned long *sys_call_table; 598 extern unsigned long sys_ni_syscall; 599 600 601 for (i = 0; i < __NR_syscalls; i++) { 602 if (sys_call_table[i*2] != sys_ni_syscall) { 603 count64++; 604 systemcfg->syscall_map_64[i >> 5] |= 605 0x80000000UL >> (i & 0x1f); 606 } 607 if (sys_call_table[i*2+1] != sys_ni_syscall) { 608 count32++; 609 systemcfg->syscall_map_32[i >> 5] |= 610 0x80000000UL >> (i & 0x1f); 611 } 612 } 613 printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n", 614 count32, count64); 615} 616 617/* 618 * Called into from start_kernel, after lock_kernel has been called. 619 * Initializes bootmem, which is unsed to manage page allocation until 620 * mem_init is called. 621 */ 622void __init setup_arch(char **cmdline_p) 623{ 624 extern void do_init_bootmem(void); 625 626 ppc64_boot_msg(0x12, "Setup Arch"); 627 628 *cmdline_p = cmd_line; 629 630 /* 631 * Set cache line size based on type of cpu as a default. 632 * Systems with OF can look in the properties on the cpu node(s) 633 * for a possibly more accurate value. 634 */ 635 dcache_bsize = ppc64_caches.dline_size; 636 icache_bsize = ppc64_caches.iline_size; 637 638 /* reboot on panic */ 639 panic_timeout = 180; 640 641 if (ppc_md.panic) 642 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block); 643 644 init_mm.start_code = PAGE_OFFSET; 645 init_mm.end_code = (unsigned long) _etext; 646 init_mm.end_data = (unsigned long) _edata; 647 init_mm.brk = klimit; 648 649 irqstack_early_init(); 650 emergency_stack_init(); 651 652 stabs_alloc(); 653 654 /* set up the bootmem stuff with available memory */ 655 do_init_bootmem(); 656 sparse_init(); 657 658 /* initialize the syscall map in systemcfg */ 659 setup_syscall_map(); 660 661#ifdef CONFIG_DUMMY_CONSOLE 662 conswitchp = &dummy_con; 663#endif 664 665 ppc_md.setup_arch(); 666 667 /* Use the default idle loop if the platform hasn't provided one. */ 668 if (NULL == ppc_md.idle_loop) { 669 ppc_md.idle_loop = default_idle; 670 printk(KERN_INFO "Using default idle loop\n"); 671 } 672 673 paging_init(); 674 ppc64_boot_msg(0x15, "Setup Done"); 675} 676 677 678/* ToDo: do something useful if ppc_md is not yet setup. */ 679#define PPC64_LINUX_FUNCTION 0x0f000000 680#define PPC64_IPL_MESSAGE 0xc0000000 681#define PPC64_TERM_MESSAGE 0xb0000000 682 683static void ppc64_do_msg(unsigned int src, const char *msg) 684{ 685 if (ppc_md.progress) { 686 char buf[128]; 687 688 sprintf(buf, "%08X\n", src); 689 ppc_md.progress(buf, 0); 690 snprintf(buf, 128, "%s", msg); 691 ppc_md.progress(buf, 0); 692 } 693} 694 695/* Print a boot progress message. */ 696void ppc64_boot_msg(unsigned int src, const char *msg) 697{ 698 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 699 printk("[boot]%04x %s\n", src, msg); 700} 701 702/* Print a termination message (print only -- does not stop the kernel) */ 703void ppc64_terminate_msg(unsigned int src, const char *msg) 704{ 705 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); 706 printk("[terminate]%04x %s\n", src, msg); 707} 708 709#ifndef CONFIG_PPC_ISERIES 710/* 711 * This function can be used by platforms to "find" legacy serial ports. 712 * It works for "serial" nodes under an "isa" node, and will try to 713 * respect the "ibm,aix-loc" property if any. It works with up to 8 714 * ports. 715 */ 716 717#define MAX_LEGACY_SERIAL_PORTS 8 718static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; 719static unsigned int old_serial_count; 720 721void __init generic_find_legacy_serial_ports(u64 *physport, 722 unsigned int *default_speed) 723{ 724 struct device_node *np; 725 u32 *sizeprop; 726 727 struct isa_reg_property { 728 u32 space; 729 u32 address; 730 u32 size; 731 }; 732 struct pci_reg_property { 733 struct pci_address addr; 734 u32 size_hi; 735 u32 size_lo; 736 }; 737 738 DBG(" -> generic_find_legacy_serial_port()\n"); 739 740 *physport = 0; 741 if (default_speed) 742 *default_speed = 0; 743 744 np = of_find_node_by_path("/"); 745 if (!np) 746 return; 747 748 /* First fill our array */ 749 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) { 750 struct device_node *isa, *pci; 751 struct isa_reg_property *reg; 752 unsigned long phys_size, addr_size, io_base; 753 u32 *rangesp; 754 u32 *interrupts, *clk, *spd; 755 char *typep; 756 int index, rlen, rentsize; 757 758 /* Ok, first check if it's under an "isa" parent */ 759 isa = of_get_parent(np); 760 if (!isa || strcmp(isa->name, "isa")) { 761 DBG("%s: no isa parent found\n", np->full_name); 762 continue; 763 } 764 765 /* Now look for an "ibm,aix-loc" property that gives us ordering 766 * if any... 767 */ 768 typep = (char *)get_property(np, "ibm,aix-loc", NULL); 769 770 /* Get the ISA port number */ 771 reg = (struct isa_reg_property *)get_property(np, "reg", NULL); 772 if (reg == NULL) 773 goto next_port; 774 /* We assume the interrupt number isn't translated ... */ 775 interrupts = (u32 *)get_property(np, "interrupts", NULL); 776 /* get clock freq. if present */ 777 clk = (u32 *)get_property(np, "clock-frequency", NULL); 778 /* get default speed if present */ 779 spd = (u32 *)get_property(np, "current-speed", NULL); 780 /* Default to locate at end of array */ 781 index = old_serial_count; /* end of the array by default */ 782 783 /* If we have a location index, then use it */ 784 if (typep && *typep == 'S') { 785 index = simple_strtol(typep+1, NULL, 0) - 1; 786 /* if index is out of range, use end of array instead */ 787 if (index >= MAX_LEGACY_SERIAL_PORTS) 788 index = old_serial_count; 789 /* if our index is still out of range, that mean that 790 * array is full, we could scan for a free slot but that 791 * make little sense to bother, just skip the port 792 */ 793 if (index >= MAX_LEGACY_SERIAL_PORTS) 794 goto next_port; 795 if (index >= old_serial_count) 796 old_serial_count = index + 1; 797 /* Check if there is a port who already claimed our slot */ 798 if (serial_ports[index].iobase != 0) { 799 /* if we still have some room, move it, else override */ 800 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) { 801 DBG("Moved legacy port %d -> %d\n", index, 802 old_serial_count); 803 serial_ports[old_serial_count++] = 804 serial_ports[index]; 805 } else { 806 DBG("Replacing legacy port %d\n", index); 807 } 808 } 809 } 810 if (index >= MAX_LEGACY_SERIAL_PORTS) 811 goto next_port; 812 if (index >= old_serial_count) 813 old_serial_count = index + 1; 814 815 /* Now fill the entry */ 816 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port)); 817 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16; 818 serial_ports[index].iobase = reg->address; 819 serial_ports[index].irq = interrupts ? interrupts[0] : 0; 820 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF; 821 822 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n", 823 index, 824 serial_ports[index].iobase, 825 serial_ports[index].irq, 826 serial_ports[index].uartclk); 827 828 /* Get phys address of IO reg for port 1 */ 829 if (index != 0) 830 goto next_port; 831 832 pci = of_get_parent(isa); 833 if (!pci) { 834 DBG("%s: no pci parent found\n", np->full_name); 835 goto next_port; 836 } 837 838 rangesp = (u32 *)get_property(pci, "ranges", &rlen); 839 if (rangesp == NULL) { 840 of_node_put(pci); 841 goto next_port; 842 } 843 rlen /= 4; 844 845 /* we need the #size-cells of the PCI bridge node itself */ 846 phys_size = 1; 847 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL); 848 if (sizeprop != NULL) 849 phys_size = *sizeprop; 850 /* we need the parent #addr-cells */ 851 addr_size = prom_n_addr_cells(pci); 852 rentsize = 3 + addr_size + phys_size; 853 io_base = 0; 854 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) { 855 if (((rangesp[0] >> 24) & 0x3) != 1) 856 continue; /* not IO space */ 857 io_base = rangesp[3]; 858 if (addr_size == 2) 859 io_base = (io_base << 32) | rangesp[4]; 860 } 861 if (io_base != 0) { 862 *physport = io_base + reg->address; 863 if (default_speed && spd) 864 *default_speed = *spd; 865 } 866 of_node_put(pci); 867 next_port: 868 of_node_put(isa); 869 } 870 871 DBG(" <- generic_find_legacy_serial_port()\n"); 872} 873 874static struct platform_device serial_device = { 875 .name = "serial8250", 876 .id = PLAT8250_DEV_PLATFORM, 877 .dev = { 878 .platform_data = serial_ports, 879 }, 880}; 881 882static int __init serial_dev_init(void) 883{ 884 return platform_device_register(&serial_device); 885} 886arch_initcall(serial_dev_init); 887 888#endif /* CONFIG_PPC_ISERIES */ 889 890int check_legacy_ioport(unsigned long base_port) 891{ 892 if (ppc_md.check_legacy_ioport == NULL) 893 return 0; 894 return ppc_md.check_legacy_ioport(base_port); 895} 896EXPORT_SYMBOL(check_legacy_ioport); 897 898#ifdef CONFIG_XMON 899static int __init early_xmon(char *p) 900{ 901 /* ensure xmon is enabled */ 902 if (p) { 903 if (strncmp(p, "on", 2) == 0) 904 xmon_init(1); 905 if (strncmp(p, "off", 3) == 0) 906 xmon_init(0); 907 if (strncmp(p, "early", 5) != 0) 908 return 0; 909 } 910 xmon_init(1); 911 debugger(NULL); 912 913 return 0; 914} 915early_param("xmon", early_xmon); 916#endif 917 918void cpu_die(void) 919{ 920 if (ppc_md.cpu_die) 921 ppc_md.cpu_die(); 922} 923