arch/powerpc/platforms/pseries/setup.c

   1 /*
   2  *  64-bit pSeries and RS/6000 setup code.
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Adapted from 'alpha' version by Gary Thomas
   6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   7  *  Modified by PPC64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  * bootup setup stuff..
  17  */
  18
  19 #undef DEBUG
  20
  21 #include <linux/config.h>
  22 #include <linux/cpu.h>
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/stddef.h>
  28 #include <linux/unistd.h>
  29 #include <linux/slab.h>
  30 #include <linux/user.h>
  31 #include <linux/a.out.h>
  32 #include <linux/tty.h>
  33 #include <linux/major.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/reboot.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/console.h>
  39 #include <linux/pci.h>
  40 #include <linux/utsname.h>
  41 #include <linux/adb.h>
  42 #include <linux/module.h>
  43 #include <linux/delay.h>
  44 #include <linux/irq.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/root_dev.h>
  47
  48 #include <asm/mmu.h>
  49 #include <asm/processor.h>
  50 #include <asm/io.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/prom.h>
  53 #include <asm/rtas.h>
  54 #include <asm/pci-bridge.h>
  55 #include <asm/iommu.h>
  56 #include <asm/dma.h>
  57 #include <asm/machdep.h>
  58 #include <asm/irq.h>
  59 #include <asm/time.h>
  60 #include <asm/nvram.h>
  61 #include "xics.h"
  62 #include <asm/firmware.h>
  63 #include <asm/pmc.h>
  64 #include <asm/mpic.h>
  65 #include <asm/ppc-pci.h>
  66 #include <asm/i8259.h>
  67 #include <asm/udbg.h>
  68 #include <asm/smp.h>
  69
  70 #include "plpar_wrappers.h"
  71
  72 #ifdef DEBUG
  73 #define DBG(fmt...) udbg_printf(fmt)
  74 #else
  75 #define DBG(fmt...)
  76 #endif
  77
  78 extern void find_udbg_vterm(void);
  79 extern void system_reset_fwnmi(void);   /* from head.S */
  80 extern void machine_check_fwnmi(void);  /* from head.S */
  81 extern void generic_find_legacy_serial_ports(u64 *physport,
  82                 unsigned int *default_speed);
  83
  84 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  85
  86 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  87 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  88
  89 static void pseries_shared_idle(void);
  90 static void pseries_dedicated_idle(void);
  91
  92 struct mpic *pSeries_mpic;
  93
  94 void pSeries_show_cpuinfo(struct seq_file *m)
  95 {
  96         struct device_node *root;
  97         const char *model = "";
  98
  99         root = of_find_node_by_path("/");
 100         if (root)
 101                 model = get_property(root, "model", NULL);
 102         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 103         of_node_put(root);
 104 }
 105
 106 /* Initialize firmware assisted non-maskable interrupts if
 107  * the firmware supports this feature.
 108  *
 109  */
 110 static void __init fwnmi_init(void)
 111 {
 112         int ret;
 113         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 114         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 115                 return;
 116         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 117                         __pa((unsigned long)system_reset_fwnmi),
 118                         __pa((unsigned long)machine_check_fwnmi));
 119         if (ret == 0)
 120                 fwnmi_active = 1;
 121 }
 122
 123 static void __init pSeries_init_mpic(void)
 124 {
 125         unsigned int *addrp;
 126         struct device_node *np;
 127         unsigned long intack = 0;
 128
 129         /* All ISUs are setup, complete initialization */
 130         mpic_init(pSeries_mpic);
 131
 132         /* Check what kind of cascade ACK we have */
 133         if (!(np = of_find_node_by_name(NULL, "pci"))
 134             || !(addrp = (unsigned int *)
 135                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 136                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 137         else
 138                 intack = addrp[prom_n_addr_cells(np)-1];
 139         of_node_put(np);
 140
 141         /* Setup the legacy interrupts & controller */
 142         i8259_init(intack, 0);
 143
 144         /* Hook cascade to mpic */
 145         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 146 }
 147
 148 static void __init pSeries_setup_mpic(void)
 149 {
 150         unsigned int *opprop;
 151         unsigned long openpic_addr = 0;
 152         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 153         struct device_node *root;
 154         int irq_count;
 155
 156         /* Find the Open PIC if present */
 157         root = of_find_node_by_path("/");
 158         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 159         if (opprop != 0) {
 160                 int n = prom_n_addr_cells(root);
 161
 162                 for (openpic_addr = 0; n > 0; --n)
 163                         openpic_addr = (openpic_addr << 32) + *opprop++;
 164                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 165         }
 166         of_node_put(root);
 167
 168         BUG_ON(openpic_addr == 0);
 169
 170         /* Get the sense values from OF */
 171         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 172
 173         /* Setup the openpic driver */
 174         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 175         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 176                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 177                                   NR_IRQS - 4, /* ipi offset */
 178                                   senses, irq_count, /* sense & sense size */
 179                                   " MPIC     ");
 180 }
 181
 182 static void pseries_lpar_enable_pmcs(void)
 183 {
 184         unsigned long set, reset;
 185
 186         power4_enable_pmcs();
 187
 188         set = 1UL << 63;
 189         reset = 0;
 190         plpar_hcall_norets(H_PERFMON, set, reset);
 191
 192         /* instruct hypervisor to maintain PMCs */
 193         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 194                 get_paca()->lppaca.pmcregs_in_use = 1;
 195 }
 196
 197 static void __init pSeries_setup_arch(void)
 198 {
 199         /* Fixup ppc_md depending on the type of interrupt controller */
 200         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 201                 ppc_md.init_IRQ       = pSeries_init_mpic;
 202                 ppc_md.get_irq        = mpic_get_irq;
 203                 /* Allocate the mpic now, so that find_and_init_phbs() can
 204                  * fill the ISUs */
 205                 pSeries_setup_mpic();
 206         } else {
 207                 ppc_md.init_IRQ       = xics_init_IRQ;
 208                 ppc_md.get_irq        = xics_get_irq;
 209         }
 210
 211 #ifdef CONFIG_SMP
 212         smp_init_pSeries();
 213 #endif
 214         /* openpic global configuration register (64-bit format). */
 215         /* openpic Interrupt Source Unit pointer (64-bit format). */
 216         /* python0 facility area (mmio) (64-bit format) REAL address. */
 217
 218         /* init to some ~sane value until calibrate_delay() runs */
 219         loops_per_jiffy = 50000000;
 220
 221         if (ROOT_DEV == 0) {
 222                 printk("No ramdisk, default root is /dev/sda2\n");
 223                 ROOT_DEV = Root_SDA2;
 224         }
 225
 226         fwnmi_init();
 227
 228         /* Find and initialize PCI host bridges */
 229         init_pci_config_tokens();
 230         find_and_init_phbs();
 231         eeh_init();
 232
 233         pSeries_nvram_init();
 234
 235         /* Choose an idle loop */
 236         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 237                 vpa_init(boot_cpuid);
 238                 if (get_paca()->lppaca.shared_proc) {
 239                         printk(KERN_INFO "Using shared processor idle loop\n");
 240                         ppc_md.idle_loop = pseries_shared_idle;
 241                 } else {
 242                         printk(KERN_INFO "Using dedicated idle loop\n");
 243                         ppc_md.idle_loop = pseries_dedicated_idle;
 244                 }
 245         } else {
 246                 printk(KERN_INFO "Using default idle loop\n");
 247                 ppc_md.idle_loop = default_idle;
 248         }
 249
 250         if (platform_is_lpar())
 251                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 252         else
 253                 ppc_md.enable_pmcs = power4_enable_pmcs;
 254 }
 255
 256 static int __init pSeries_init_panel(void)
 257 {
 258         /* Manually leave the kernel version on the panel. */
 259         ppc_md.progress("Linux ppc64\n", 0);
 260         ppc_md.progress(system_utsname.version, 0);
 261
 262         return 0;
 263 }
 264 arch_initcall(pSeries_init_panel);
 265
 266
 267 /* Build up the ppc64_firmware_features bitmask field
 268  * using contents of device-tree/ibm,hypertas-functions.
 269  * Ultimately this functionality may be moved into prom.c prom_init().
 270  */
 271 static void __init fw_feature_init(void)
 272 {
 273         struct device_node * dn;
 274         char * hypertas;
 275         unsigned int len;
 276
 277         DBG(" -> fw_feature_init()\n");
 278
 279         ppc64_firmware_features = 0;
 280         dn = of_find_node_by_path("/rtas");
 281         if (dn == NULL) {
 282                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 283                 goto no_rtas;
 284         }
 285
 286         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 287         if (hypertas) {
 288                 while (len > 0){
 289                         int i, hypertas_len;
 290                         /* check value against table of strings */
 291                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 292                                 if ((firmware_features_table[i].name) &&
 293                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 294                                         /* we have a match */
 295                                         ppc64_firmware_features |=
 296                                                 (firmware_features_table[i].val);
 297                                         break;
 298                                 }
 299                         }
 300                         hypertas_len = strlen(hypertas);
 301                         len -= hypertas_len +1;
 302                         hypertas+= hypertas_len +1;
 303                 }
 304         }
 305
 306         of_node_put(dn);
 307 no_rtas:
 308
 309         DBG(" <- fw_feature_init()\n");
 310 }
 311
 312
 313 static  void __init pSeries_discover_pic(void)
 314 {
 315         struct device_node *np;
 316         char *typep;
 317
 318         /*
 319          * Setup interrupt mapping options that are needed for finish_device_tree
 320          * to properly parse the OF interrupt tree & do the virtual irq mapping
 321          */
 322         __irq_offset_value = NUM_ISA_INTERRUPTS;
 323         ppc64_interrupt_controller = IC_INVALID;
 324         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 325                 typep = (char *)get_property(np, "compatible", NULL);
 326                 if (strstr(typep, "open-pic"))
 327                         ppc64_interrupt_controller = IC_OPEN_PIC;
 328                 else if (strstr(typep, "ppc-xicp"))
 329                         ppc64_interrupt_controller = IC_PPC_XIC;
 330                 else
 331                         printk("pSeries_discover_pic: failed to recognize"
 332                                " interrupt-controller\n");
 333                 break;
 334         }
 335 }
 336
 337 static void pSeries_mach_cpu_die(void)
 338 {
 339         local_irq_disable();
 340         idle_task_exit();
 341         /* Some hardware requires clearing the CPPR, while other hardware does not
 342          * it is safe either way
 343          */
 344         pSeriesLP_cppr_info(0, 0);
 345         rtas_stop_self();
 346         /* Should never get here... */
 347         BUG();
 348         for(;;);
 349 }
 350
 351 static int pseries_set_dabr(unsigned long dabr)
 352 {
 353         return plpar_hcall_norets(H_SET_DABR, dabr);
 354 }
 355
 356 static int pseries_set_xdabr(unsigned long dabr)
 357 {
 358         /* We want to catch accesses from kernel and userspace */
 359         return plpar_hcall_norets(H_SET_XDABR, dabr,
 360                         H_DABRX_KERNEL | H_DABRX_USER);
 361 }
 362
 363 /*
 364  * Early initialization.  Relocation is on but do not reference unbolted pages
 365  */
 366 static void __init pSeries_init_early(void)
 367 {
 368         void *comport;
 369         int iommu_off = 0;
 370         unsigned int default_speed;
 371         u64 physport;
 372
 373         DBG(" -> pSeries_init_early()\n");
 374
 375         fw_feature_init();
 376
 377         if (platform_is_lpar())
 378                 hpte_init_lpar();
 379         else {
 380                 hpte_init_native();
 381                 iommu_off = (of_chosen &&
 382                              get_property(of_chosen, "linux,iommu-off", NULL));
 383         }
 384
 385         generic_find_legacy_serial_ports(&physport, &default_speed);
 386
 387         if (platform_is_lpar())
 388                 find_udbg_vterm();
 389         else if (physport) {
 390                 /* Map the uart for udbg. */
 391                 comport = (void *)ioremap(physport, 16);
 392                 udbg_init_uart(comport, default_speed);
 393
 394                 DBG("Hello World !\n");
 395         }
 396
 397         if (firmware_has_feature(FW_FEATURE_DABR))
 398                 ppc_md.set_dabr = pseries_set_dabr;
 399         else if (firmware_has_feature(FW_FEATURE_XDABR))
 400                 ppc_md.set_dabr = pseries_set_xdabr;
 401
 402         iommu_init_early_pSeries();
 403
 404         pSeries_discover_pic();
 405
 406         DBG(" <- pSeries_init_early()\n");
 407 }
 408
 409
 410 static int pSeries_check_legacy_ioport(unsigned int baseport)
 411 {
 412         struct device_node *np;
 413
 414 #define I8042_DATA_REG  0x60
 415 #define FDC_BASE        0x3f0
 416
 417
 418         switch(baseport) {
 419         case I8042_DATA_REG:
 420                 np = of_find_node_by_type(NULL, "8042");
 421                 if (np == NULL)
 422                         return -ENODEV;
 423                 of_node_put(np);
 424                 break;
 425         case FDC_BASE:
 426                 np = of_find_node_by_type(NULL, "fdc");
 427                 if (np == NULL)
 428                         return -ENODEV;
 429                 of_node_put(np);
 430                 break;
 431         }
 432         return 0;
 433 }
 434
 435 /*
 436  * Called very early, MMU is off, device-tree isn't unflattened
 437  */
 438 extern struct machdep_calls pSeries_md;
 439
 440 static int __init pSeries_probe(int platform)
 441 {
 442         if (platform != PLATFORM_PSERIES &&
 443             platform != PLATFORM_PSERIES_LPAR)
 444                 return 0;
 445
 446         /* if we have some ppc_md fixups for LPAR to do, do
 447          * it here ...
 448          */
 449
 450         return 1;
 451 }
 452
 453 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 454
 455 static inline void dedicated_idle_sleep(unsigned int cpu)
 456 {
 457         struct paca_struct *ppaca = &paca[cpu ^ 1];
 458
 459         /* Only sleep if the other thread is not idle */
 460         if (!(ppaca->lppaca.idle)) {
 461                 local_irq_disable();
 462
 463                 /*
 464                  * We are about to sleep the thread and so wont be polling any
 465                  * more.
 466                  */
 467                 clear_thread_flag(TIF_POLLING_NRFLAG);
 468                 smp_mb__after_clear_bit();
 469
 470                 /*
 471                  * SMT dynamic mode. Cede will result in this thread going
 472                  * dormant, if the partner thread is still doing work.  Thread
 473                  * wakes up if partner goes idle, an interrupt is presented, or
 474                  * a prod occurs.  Returning from the cede enables external
 475                  * interrupts.
 476                  */
 477                 if (!need_resched())
 478                         cede_processor();
 479                 else
 480                         local_irq_enable();
 481                 set_thread_flag(TIF_POLLING_NRFLAG);
 482         } else {
 483                 /*
 484                  * Give the HV an opportunity at the processor, since we are
 485                  * not doing any work.
 486                  */
 487                 poll_pending();
 488         }
 489 }
 490
 491 static void pseries_dedicated_idle(void)
 492 {
 493         struct paca_struct *lpaca = get_paca();
 494         unsigned int cpu = smp_processor_id();
 495         unsigned long start_snooze;
 496         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 497         set_thread_flag(TIF_POLLING_NRFLAG);
 498
 499         while (1) {
 500                 /*
 501                  * Indicate to the HV that we are idle. Now would be
 502                  * a good time to find other work to dispatch.
 503                  */
 504                 lpaca->lppaca.idle = 1;
 505
 506                 if (!need_resched()) {
 507                         start_snooze = __get_tb() +
 508                                 *smt_snooze_delay * tb_ticks_per_usec;
 509
 510                         while (!need_resched() && !cpu_is_offline(cpu)) {
 511                                 ppc64_runlatch_off();
 512
 513                                 /*
 514                                  * Go into low thread priority and possibly
 515                                  * low power mode.
 516                                  */
 517                                 HMT_low();
 518                                 HMT_very_low();
 519
 520                                 if (*smt_snooze_delay != 0 &&
 521                                     __get_tb() > start_snooze) {
 522                                         HMT_medium();
 523                                         dedicated_idle_sleep(cpu);
 524                                 }
 525
 526                         }
 527
 528                         HMT_medium();
 529                 }
 530
 531                 lpaca->lppaca.idle = 0;
 532                 ppc64_runlatch_on();
 533
 534                 preempt_enable_no_resched();
 535                 schedule();
 536                 preempt_disable();
 537
 538                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 539                         cpu_die();
 540         }
 541 }
 542
 543 static void pseries_shared_idle(void)
 544 {
 545         struct paca_struct *lpaca = get_paca();
 546         unsigned int cpu = smp_processor_id();
 547
 548         while (1) {
 549                 /*
 550                  * Indicate to the HV that we are idle. Now would be
 551                  * a good time to find other work to dispatch.
 552                  */
 553                 lpaca->lppaca.idle = 1;
 554
 555                 while (!need_resched() && !cpu_is_offline(cpu)) {
 556                         local_irq_disable();
 557                         ppc64_runlatch_off();
 558
 559                         /*
 560                          * Yield the processor to the hypervisor.  We return if
 561                          * an external interrupt occurs (which are driven prior
 562                          * to returning here) or if a prod occurs from another
 563                          * processor. When returning here, external interrupts
 564                          * are enabled.
 565                          *
 566                          * Check need_resched() again with interrupts disabled
 567                          * to avoid a race.
 568                          */
 569                         if (!need_resched())
 570                                 cede_processor();
 571                         else
 572                                 local_irq_enable();
 573
 574                         HMT_medium();
 575                 }
 576
 577                 lpaca->lppaca.idle = 0;
 578                 ppc64_runlatch_on();
 579
 580                 preempt_enable_no_resched();
 581                 schedule();
 582                 preempt_disable();
 583
 584                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 585                         cpu_die();
 586         }
 587 }
 588
 589 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 590 {
 591         if (platform_is_lpar())
 592                 return PCI_PROBE_DEVTREE;
 593         return PCI_PROBE_NORMAL;
 594 }
 595
 596 #ifdef CONFIG_KEXEC
 597 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 598 {
 599         /* Don't risk a hypervisor call if we're crashing */
 600         if (!crash_shutdown) {
 601                 unsigned long vpa = __pa(&get_paca()->lppaca);
 602
 603                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 604                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 605                                         "failed\n", smp_processor_id(),
 606                                         hard_smp_processor_id());
 607                 }
 608         }
 609
 610         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 611                 mpic_teardown_this_cpu(secondary);
 612         else
 613                 xics_teardown_cpu(secondary);
 614 }
 615 #endif
 616
 617 struct machdep_calls __initdata pSeries_md = {
 618         .probe                  = pSeries_probe,
 619         .setup_arch             = pSeries_setup_arch,
 620         .init_early             = pSeries_init_early,
 621         .show_cpuinfo           = pSeries_show_cpuinfo,
 622         .log_error              = pSeries_log_error,
 623         .pcibios_fixup          = pSeries_final_fixup,
 624         .pci_probe_mode         = pSeries_pci_probe_mode,
 625         .irq_bus_setup          = pSeries_irq_bus_setup,
 626         .restart                = rtas_restart,
 627         .power_off              = rtas_power_off,
 628         .halt                   = rtas_halt,
 629         .panic                  = rtas_os_term,
 630         .cpu_die                = pSeries_mach_cpu_die,
 631         .get_boot_time          = rtas_get_boot_time,
 632         .get_rtc_time           = rtas_get_rtc_time,
 633         .set_rtc_time           = rtas_set_rtc_time,
 634         .calibrate_decr         = generic_calibrate_decr,
 635         .progress               = rtas_progress,
 636         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 637         .system_reset_exception = pSeries_system_reset_exception,
 638         .machine_check_exception = pSeries_machine_check_exception,
 639 #ifdef CONFIG_KEXEC
 640         .kexec_cpu_down         = pseries_kexec_cpu_down,
 641 #endif
 642 };